JP2011224385A - Cleaning wet sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning wet sheet which has high capturing performance of dust including hair and solid dirt, and low friction resistance in cleaning.SOLUTION: The wet sheet 10 includes a fiber assembly 11 formed by hydroentangling fibrous webs 11a, 11b, the fiber assembly 11 being impregnated with aqueous detergent. At least one surface of the fiber assembly 11 includes a number of projections 22 formed by entangling of the fiber components of the fiber assembly 11, and a recessed portion 21 having a shape of surrounding the projections 22. The one surface of the fiber assembly 11 has a static frictional resistance of 900-2,500 cN to sandpaper (1,200 grit).

Description

  The present invention relates to a cleaning wet sheet mainly made of a fiber material.

  A cleaning wet sheet made of a fiber material and impregnated with an aqueous cleaning agent is different from a cleaning dry sheet that is not impregnated with an aqueous cleaning agent. It is not easy to improve the collection performance of dust such as hair caused by entanglement of the hair. This is because the interaction between constituent fibers is strengthened by the cleaning agent, and the degree of freedom of the fibers tends to decrease. In addition, the dust tends to adhere to the surface to be cleaned due to the interfacial tension of the cleaning agent released from the sheet to the surface to be cleaned. These tendencies become prominent when a sheet is attached to a cleaning tool such as a wiper.

  Another problem with the cleaning wet sheet is prevention of excessive release of the cleaning agent. If the cleaning agent is excessively released, the frictional resistance during cleaning increases due to this, and the operability of cleaning may be reduced.

  In order to solve the above-mentioned problems, the present applicant is first made of a nonwoven fabric formed by fiber entanglement, and the static friction resistance value of the surface layer with respect to the sandpaper (particle size: No. 1200) is 900-2500 cN. A cleaning wet sheet in an intertwined state has been proposed (see Patent Document 1). This wet sheet has a rhombus-shaped uneven pattern formed by embossing. The formation of the concavo-convex pattern by embossing is aimed at reducing the contact area with the surface to be cleaned and improving the operability of the sheet during cleaning.

  Apart from this wet sheet, the present applicant comprises a fiber assembly formed by hydroentangling a fiber web and a net-like sheet, and is a sheet having a large number of irregularities formed from the fiber assembly, A bulky sheet is also proposed in which the constituent fibers of the fiber web are intertwined by the hydroentanglement and the constituent fibers and the net-like sheet are intertwined and integrated with each other (see Patent Document 2). This bulky sheet is excellent in the collection property of the dust existing on the grooves of flooring, the uneven surfaces of furniture and electrical appliances. However, Patent Document 2 does not describe various characteristics required for wet sheets including control of the amount of cleaning agent released.

JP 2001-269300 A JP 2001-336052 A

  An object of the present invention is to provide a cleaning wet sheet having further improved performance as compared with the above-described conventional sheet.

The present invention comprises a fiber assembly formed by hydroentangling a fiber web, the fiber assembly is impregnated with an aqueous cleaning agent,
At least one surface of the fiber assembly has a number of convex portions formed by entanglement of the constituent fibers of the fiber assembly, and concave portions having a shape surrounding the convex portions,
The one surface of the fiber assembly provides a cleaning wet sheet having a static friction resistance value of 900 to 2500 cN with respect to sandpaper (particle size # 1200).

  The wet sheet for cleaning of the present invention has a high dust collection performance including hair and solid waste. Moreover, the frictional resistance at the time of cleaning is low, and the operability is good.

It is a perspective view which shows one Embodiment of the wet sheet | seat for cleaning of this invention. It is the II-II sectional view taken on the line in FIG. It is a schematic diagram which shows the measuring method of a static friction resistance value. It is a schematic diagram which shows the measuring method of the discharge | release amount of a cleaning agent. It is a schematic diagram which shows the suitable apparatus for manufacturing the wet sheet | seat for cleaning shown in FIG. It is a schematic diagram which expands and shows the principal part of the uneven | corrugated provision part in FIG. It is a figure which shows the 1st patterning member in the uneven | corrugated provision part of FIG. It is a figure which shows the 2nd patterning member in the uneven | corrugated provision part of FIG. It is a schematic diagram which shows the state of the uneven | corrugated shaping by the uneven | corrugated provision part shown in FIG.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a perspective view of one embodiment of the cleaning wet sheet of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. The wet sheet 10 of the present embodiment is formed by impregnating a fiber sheet mainly composed of a fiber material with an aqueous cleaning agent. The wet sheet 10 is composed of a fiber assembly 11 formed by hydroentanglement of a fiber web, and a net-like sheet 12 disposed inside the fiber assembly 11. In the fiber assembly 11 and the mesh sheet 12, the constituent fibers of the fiber assembly 11 are intertwined with the mesh sheet 12 by hydroentanglement, and both are integrated.

  The fiber assembly 11 is preferably formed only by entanglement of the constituent fibers. In this way, unlike the fiber assembly bonded by fusing fibers made of thermoplastic resin, the wet sheet 10 has a good touch, and is capable of collecting and retaining dirt such as hair and fine dust. Become better.

  The cleaning wet sheet 10 has a concave portion 21 and a convex portion 22. The convex portion 22 is surrounded by the concave portion 21. As shown in FIG. 1, the recess 21 has a rhombic lattice shape. The rhombic lattice of the recesses 21 is continuous over the planar direction of the wet sheet 10. The convex portion 22 is located in each lattice of the concave portion 22. Since the concave portion 21 has a continuous closed shape, the convex portions 22 are partitioned by the concave portion 21 and are independent from each other. The convex portion 22 has a rhombus corresponding to the shape in the lattice of the rhombic lattice of the concave portion 21. However, the concave portion 22 surrounding the convex portion 21 does not necessarily have a continuous closed shape. For example, with respect to the area of the apparent concave portion 22 that surrounds the convex portion 21, the concave portion 21 may be partially missing to form a discontinuous closed shape with an area ratio of less than 30%, particularly less than 10%.

  The concave portion 21 and the convex portion 22 are distinguished by their fiber density and thickness. Specifically, the concave portion 21 has a higher fiber density and a smaller thickness than the convex portion 22. On the other hand, the convex portion 22 is smaller in fiber density and thicker than the concave portion 21. As a result, the wet sheet 10 has a convex portion 22 having a large thickness and a concave portion 21 having a small thickness on at least one surface side thereof. By forming the concave portion 21 and the convex portion 22, at least one surface of the wet sheet 10 has an uneven shape, and the sheet 10 has a bulky structure.

  A plurality of small convex portions 31 and small concave portions 32 are formed in the convex portion 22 having a large thickness. The small convex portion 31 is formed such that a fiber assembly constituting the convex portion 22 protrudes from one surface side of the convex portion 22 to the other surface side. A small concave portion 32 is located between the small convex portions 31. As a result, the convex portion 22 has an uneven shape as a whole.

  The small convex portions 31 are approximately the same size, have a slightly elongated and narrow mountain shape, and are provided regularly. The small convex portions 31 have individual shapes separated by the small concave portions 32, but a part thereof may be connected to form a continuous body in the width direction and / or the longitudinal direction of the sheet 10.

  As described above, the wet sheet 10 has the convex portion 22 having a large and convex shape and the concave portion 21 having a small thickness and a concave shape, and the convex portion 22 further includes a small convex portion 31 and a small concave portion 32. It has a double concavo-convex structure. In the convex part 22 with a large thickness, the degree of fiber freedom is high. As a result, it is excellent in the cleanability of dirt with respect to the grooves and uneven surfaces of the flooring, and excellent in the collection and retention of relatively large dirt such as bread crumbs. In addition, it is excellent in the collection and retention of dirt such as hair and fine dust.

  Further, the convex portion 22 having a low fiber density has a closed shape and is surrounded by the concave portion 21 having a high fiber density, so that the degree of freedom of the fiber in the convex portion 22 is increased while the degree of freedom of the fiber in the convex portion 22 is increased. It is possible to effectively prevent fluffing and fiber removal.

As described above, the concave portion 21 has a fiber density higher than that of the convex portion 22, but the fiber density itself of the concave portion 21 is 0.020 to 0.65 g / cm ³ , particularly 0.035 to 0.00. 50 g / cm ³ is preferable from the viewpoint of effectively preventing fiber fluffing and fiber slippage at the convex portion 22 having a high degree of fiber freedom. On the other hand, fiber density of the convex portion 22, a condition that is lower than the fiber density of the recesses 21, 0.005~0.65g / cm ^3, to be particularly 0.01~0.40g / cm ^3, This is preferable from the viewpoint of improving dust collection.

  The fiber length of the constituent fibers of the fiber assembly 11 is 20 to 100 mm, particularly 30 to 70 mm, in relation to the above-described fiber fluffing and fiber removal and fiber freedom. It is preferable from the viewpoint of preventing fluffing and fiber removal. When the fiber assembly 11 includes a plurality of fibers, it is preferable that the average fiber diameter of these fibers is within the above range.

  The fiber density of the concave portion 21 and the convex portion 22 is measured by the following method. A length of 50 mm is measured for each of the concave portion 21 and the convex portion 22 having a predetermined area from the wet sheet 10 with a laser thickness meter, and an average of 10 maximum points is calculated to obtain a thickness. Also, the weight is measured, and the basis weight is calculated by dividing the measured weight by the area. The fiber density is calculated from the measured thickness and the calculated basis weight. The average value of the calculated fiber density is defined as the fiber density in the present invention.

  The convex portion 22 is thicker than the concave portion 21. Therefore, of the surface of the wet sheet 10, the convex portion 22 mainly comes into contact with the surface to be cleaned, and the concave portion 21 is difficult to contact the surface to be cleaned. As a result, the contact area between the wet sheet 10 and the surface to be cleaned is reduced. Therefore, when the wet sheet 10 is used as a wet type cleaning sheet impregnated with a liquid, for example, the resistance during wiping is reduced. From this viewpoint, it is preferable that the convex portion 22 has a thickness of 1.0 to 5.0 mm, particularly 1.2 to 4.0 mm. On the other hand, the recess 21 preferably has a thickness of 0.1 to 1.5 mm.

  Compared with the convex part 22, although the recessed part 21 is in the state which is hard to contact the surface to be cleaned, it is a region involved in cleaning. In particular, it is easy to collect relatively large dust such as crumbs and crumbs. This is because (a) a space surrounding relatively large dust is formed between the recess 21 and the surface to be cleaned, and (b) the recess 21 has a high fiber density, Since it is formed only by the entanglement of the fibers, it is due to having the entanglement property of dust. On the other hand, for example, a recess formed by heat embossing as described in Patent Document 1 does not have dust entanglement because the fibers are fused. That is, it is not an area involved in cleaning.

  The thicknesses of the concave portion 21 and the convex portion 22 are measured by the following method. The concave portion 21 and the convex portion 22 having a predetermined area from the wet sheet 10 are each measured for a length of 50 mm by a laser thickness meter, the average of 10 maximum points is calculated, and this average value is defined as the thickness in the present invention.

The area ratio between the concave portion 21 and the convex portion 22 affects the resistance during wiping. That is, if the area of the convex part 22 is excessive compared with the area of the concave part 21, the contact area of the convex part 22 increases too much and the resistance at the time of wiping will become large. On the other hand, when the area of the concave portion 21 is excessive as compared with the area of the convex portion 22, the area of the convex portion 22 having a high degree of fiber freedom is too small, and the entanglement property of dust tends to be reduced. Moreover, the impregnation property of the liquid and the sustained release property of the impregnated liquid tend to be lowered. Taking these into consideration, the area ratio of the recesses 21 is preferably 10 to 70%, particularly preferably 20 to 60%, and the area ratio of the protrusions 22 is 30 to 90%, particularly 40 to 80%. preferable. Moreover, it is preferable that each area of the convex part 22 is 1-15 cm < ² >, especially 2-10 cm < ² >.

  Although the convex part 22 in this embodiment is carrying out the rhombus as mentioned above, the shape of the convex part 22 is not restricted to this. However, it is preferable that the convex portion 22 is not too anisotropic. The shape having a large anisotropy is the length of the crossing portion of the line crossing the convex portion 22 in the line having the longest length crossing the convex portion 22 (this line is referred to as the longest transverse line in the vertical direction). (This length is referred to as the maximum longitudinal crossing length Lm) and the line that is the longest crossing line across the convex portion 22 among the lines orthogonal to the longest horizontal crossing line in the vertical direction (this line is the longest horizontal crossing line in the horizontal direction). The ratio Lm / Lt to the length of the crossing portion (this length is referred to as the transverse maximum transverse length Lt) is 10 or more.

  In the wet sheet 10, as described above, the fiber degree of freedom of the convex portion 22 is high as described above. However, in this embodiment, the static friction resistance value is adopted with respect to the degree of fiber freedom, that is, the degree of fiber entanglement. be able to. The static friction resistance value is measured by the method shown in FIG. That is, a weight 101 (total weight 400 g including sandpaper) 101 having a bottom surface attached with sandpaper (3M water-resistant paper Techno sander particle size No. 1200) 100 is firmly fixed on a horizontal base 102. Further, the sandpaper 100 is placed on the surface of the wet sheet 10 (200 mm × 280 mm) impregnated with the aqueous detergent so that the sand surface of the sandpaper 100 faces the wet sheet 10. The wet sheet 10 has an uneven surface facing the sand surface of the sandpaper 100. A thread 103 is attached to the side of the weight, and the other end of the thread 103 is attached to a load cell 105 of a tensile tester (Orientic, RTM-25) via a pulley 104. The tensile tester is operated, the weight 101 is moved horizontally by 30 mm at a speed of 500 mm / min, the initial maximum static friction resistance value at that time is measured, and this is used as an index of the fiber entanglement degree of the wet sheet 10. The measurement is performed in the sheet flow direction (MD) and the width direction (CD) in the manufacturing process of the wet sheet 10. The sandpaper is replaced with a new one after each measurement.

  In the wet sheet 10 impregnated with the aqueous detergent, the fiber is caught on the sandpaper as the fiber is in a low entanglement state, that is, in a state where the degree of freedom of each fiber is high, and thus the static friction resistance value is high. A tendency to show values is observed.

  The static friction resistance value of the wet sheet 10 serving as an index of the fiber entanglement state is 900 to 2500 cN. When it is less than 900 cN, it is difficult to obtain good entanglement of hair and cotton dust. If it exceeds 2500 cN, the surface strength of the sheet is weakened, and the fibers are caught by burrs or the like on the floor board, so that the fibers easily fall off and the operability of the mop becomes heavy. From the viewpoint of achieving both the entanglement of hair and cotton dust, the surface strength of the wet sheet 10, and the operability of the mop, the static friction resistance value is preferably in the range of 1100 to 2200 cN, and more preferably 1200 to 2000 cN. It is most preferable that the static friction resistance value is in the above range in both the MD and CD directions of the wet sheet 10, but it is sufficient if the static friction resistance value in at least one of the directions is in the above range.

  As described above, the convex portion 22 of the wet sheet 10 has the small convex portion 31 and the small concave portion 32, but the small convex portion 31 and the small concave portion 32 are in relation to the fiber assembly 11. It is formed by re-arrangement and re-entanglement of constituent fibers by applied hydroentanglement. Thereby, the small convex part 31 and the small recessed part 32 hold | maintain the form by themselves. Therefore, the small convex portion 31 and the small concave portion 32 are difficult to be sagged against the load. Due to the formation of the small convex portions 31 and the small concave portions 32, the apparent thickness of the wet sheet 10 is larger than the thickness of the fiber assembly 11 before the small convex portions 31 and the small concave portions 32 are formed. .

  “It is formed by re-arrangement / re-entanglement of fibers” means that a fiber aggregate once weakly entangled by hydroentangling is hydroentangled again on the uneven shaping member, so that the fiber is shaped. It means that the members are rearranged along the concavo-convex portions of the member and entangled again.

  The small convex portion 31 and the small concave portion 32 are formed by bending the fiber assembly 11 in the thickness direction. A large number of bent portions formed in the bend-like fiber assembly 11 correspond to the small convex portions 31 and the small concave portions 32, respectively. As described above, the small convex portion 31 and the small concave portion 32 are formed by rearrangement of the fibers. In this case, the constituent fibers of the small convex portion 31 flow toward the small concave portion 32 due to the pressure of high-pressure water. The distribution of the fibers is very low. In addition, if the fiber distribution further proceeds, there will be holes where the small convex portions 31 exist. In order to make the fiber assembly 11 bend so that fiber distribution does not occur, for example, the energy applied during hydroentanglement may be adjusted.

  In the wet sheet 10, the concave portion 21 has a large number of small convex portions 41. The small convex portion 41 has a substantially dome shape, and the inside thereof is hollow. The small convex portions 41 are regularly formed over the entire area of the concave portion 21. The small convex portion 41 has a thickness (height) smaller than the thickness (height) of the convex portion 22. By forming the small convex portion 41 in the concave portion 21, there is an advantage that the dust collecting property in the concave portion 21 can be further enhanced.

When viewed in plan, the small convex portion 41 has a circular shape, and its diameter is preferably 0.5 to 5 mm, particularly 1 to 3 mm. Moreover, it is preferable that the small convex-shaped part 41 exists in an area of 1 cm < ² > on the average in 1-10 pieces, especially 2-6 pieces.

  Next, the fiber assembly 11 and the mesh sheet 12 constituting the wet sheet 10 will be described. The fiber assembly 11 is a non-woven fabric formed by intertwining its constituent fibers by hydroentanglement of the fiber web. Since the fiber assembly 11 is preferably formed only by entanglement of the constituent fibers, the degree of freedom of the constituent fibers is larger than that of the web formed only by fusing or bonding the constituent fibers. For this reason, it is excellent in the collection property and retention of dirt, such as hair and fine dust, by the constituent fiber, and the touch is good.

As the fiber constituting the fiber assembly 11, for example, fibers described in the fourth column, lines 3 to 10 of US Pat. No. 5,525,397 of the applicant's previous application can be used. The fiber assembly 11 contains 50% by weight or more of fibers having a fineness of 5 dtex or less, particularly 70% by weight or more of fibers of 3.5 dtex or less, and prevents the wet sheet 10 from being perforated. From the viewpoint of expression and maintenance of a high bulkiness. Moreover, it is preferable also from being excellent in the collection property and the retention property of the dirt of the hair. The basis weight of the fiber assembly 11 and the fiber length of the constituent fibers are determined in accordance with the use of the wet sheet for cleaning in consideration of processability, cost, and the like. The basis weight of the fiber assembly 11 is 30 to 100 g / m ² , particularly 40 to 70 g / m ² , so that the wet sheet 10 is prevented from being perforated, sufficiently bulky, and bulky. From the standpoint of maintaining A surfactant or a lubricant that can improve the surface physical characteristics of the fiber assembly and improve the dust collection property may be imparted to the fiber assembly.

  The fiber assembly 11 preferably contains hydrophilic fibers, such as cellulose fibers and polyacrylonitrile fibers. Cellulose fibers include rayon, lyocell, tencel, and cotton fibers. These can be used alone or in combination of two or more. It is also preferable to use hydrophilic synthetic fibers. By using hydrophilic synthetic fibers, the sheet 10 is bulkier than when only cellulose fibers are used while improving the retention of the impregnated cleaning agent, and the cleaning property, operability, and texture are even better. Become. As the hydrophilic synthetic fiber, it is preferable to use acrylic fiber, polyethylene terephthalate fiber hydrophilized by a treatment with a hydrophilizing agent such as a fiber oil. Examples of the hydrophilic treatment method include surface adhesion treatment with a hydrophilizing agent and kneading. As the hydrophilizing agent, a general fiber surfactant or the like can be used. The hydrophilizing agent preferably has not only initial hydrophilic performance but also durable hydrophilic performance. As an evaluation method for initial hydrophilicity and durable hydrophilicity, the cotton ball method (initial hydrophilicity: curled 1.0 g of card web, put it into a 7 cm diameter ball, and gently put it on the water surface until the cotton ball completely sinks. Durability Hydrophilicity: Same as initial hydrophilicity with dry cotton after shaking with shaker for 30 minutes with pure water (200 g of pure water is used for 1 g of cotton ball) with a bath ratio of 1: 200. And evaluate the number of seconds). And it is preferable that the initial hydrophilicity measured by this method is 0.1 to 20 seconds, and durable hydrophilicity is 0.2 to 30 seconds. The degree of hydrophilicity is preferably 2 mm or more after 10 minutes in both the longitudinal and lateral directions of the sheet 10 according to the birec method defined in JIS L1907 5.1.2.

  Moreover, it is preferable that the fiber assembly 11 contains the fiber which has a deformed cross section. Specifically, it is preferable to include a fiber having an irregular cross section having a shape capable of holding the aqueous cleaning agent by capillary force. As a result, the amount of cleaning agent that can be held by the fibers increases, and the amount of cleaning agent impregnated as a whole of the fiber assembly can be increased. Examples of the modified cross-sectional shape include a C shape, a Y shape, a hollow shape, and a β shape.

The net-like sheet 12 arranged inside the fiber assembly is a resin net formed in a rectangular lattice shape as a whole. The mesh sheet 12 preferably has an air permeability of 0.1 to 1000 cm ³ / (cm ² · sec). A non-woven fabric, paper, film, etc. can be used as the mesh sheet 12 in addition to the net as long as the air permeability is within this range. It is preferable that not only the fiber assembly 11 is intertwined between the constituent fibers but also the constituent fibers of the fiber assembly 11 are intertwined and / or fused with the mesh sheet 12. As a result, the tensile strength of the wet sheet 10 is improved. When the net-like sheet 12 is a net, the wire diameter is preferably 50 to 600 μm, more preferably 75 to 350 μm. The distance between the lines is preferably 2 to 30 mm, more preferably 4 to 20 mm. As a constituent material of the reticulated sheet 12, for example, materials described in column 3, lines 39 to 46 of US Pat. No. 5,525,397 can be used. In addition, it is not prevented to use a heat-shrinkable material as the constituent material of the mesh sheet 12. However, the net-like sheet 12 is preferably not heat-shrinkable, or even if heat-shrinkable, it is preferably low heat-shrinkable with a heat shrinkage rate of 3% or less after heating at 140 ° C. for 3 minutes.

Wet sheet 10, the basis weight of 40~200g / m ^2, that lifting the a 50 to 100 g / m ^2, with moderate thick feeling sheet is imparted, from the viewpoint of improvement of the workability can be achieved preferable. Moreover, it is preferable also from the point from which the impregnation property of a liquid becomes sufficient.

  As the aqueous cleaning agent contained in the wet sheet 10, it is preferable to use one having a viscosity at 25 ° C. of 20 to 30000 mPa · s. By using an aqueous detergent having a viscosity in this range, (1) the amount of aqueous detergent released to the floor at the beginning of cleaning is reduced, and the amount of aqueous detergent released from the beginning to the end of cleaning is uniform. (2) Improved cleaning sustainability for a large surface to be cleaned, (3) Since the amount of water-based cleaning agent released is low even at the initial stage of cleaning, the friction resistance value for the surface to be cleaned of the wet sheet is reduced, ( 4) Since the release amount of the aqueous cleaning agent is low even at the initial stage of cleaning, there is an advantage in that the degree of freedom of fibers on the surface of the wet sheet is large, and hair and cotton dust are entangled and held by the fibers. Specifically, when the viscosity of the aqueous cleaning agent is less than 20 mPa · s, it may be difficult to reduce the amount of the aqueous cleaning agent released to the floor at the initial stage of cleaning. If it exceeds 30000 Pa · s, it may be difficult to impregnate the sheet with an aqueous cleaning agent. The viscosity is 100 to 1000 mPa · s, particularly 300 to 800 mPa · s, from the viewpoint of reducing the amount of aqueous detergent released at the initial stage of cleaning and further improving the handleability in the step of impregnating the sheet with the aqueous detergent. More preferred. Viscosity is measured using a Brookfield viscometer. The rotor used and the number of rotations are appropriately changed according to the viscosity of the aqueous cleaning agent.

  The aqueous cleaning agent is preferably substantially free of water-insoluble solid particles. When water-insoluble solid particles are blended in the aqueous cleaning agent, the solid particles may remain on the surface to be cleaned and may need to be wiped twice. However, there is no problem even if a very small amount of impurities, for example, about 0.1% by weight is contained.

  The aqueous cleaning agent preferably contains water as a medium and contains a surfactant, an alkali agent, a thickener and a water-soluble solvent. All the components contained in the aqueous cleaning agent are preferably substantially water-soluble. The non-volatile residual component contained in the aqueous cleaning agent is preferably 10% by weight or less from the viewpoint of finish after cleaning, and particularly preferably 5% by weight or less, and particularly preferably 1% by weight or less.

  As the surfactant, any of an anionic surfactant, a nonionic surfactant, a cationic surfactant and an amphoteric surfactant can be used. In particular, from the viewpoint of compatibility between cleanability and finish, polyoxyalkylene (Alkylene oxide addition mole number 1-20) alkyl (straight chain or branched chain having 8 to 22 carbon atoms) ether, alkyl (straight chain or branched chain having 8 to 22 carbon atoms) glycoside (average sugar condensation degree 1 to 5) , Nonionic active agents such as sorbitan fatty acid (straight or branched chain having 8 to 22 carbon atoms) ester, alkyl (straight or branched chain having 6 to 22 carbon atoms) glyceryl ether, and alkylcarboxybetaine, alkylsulfobetaine, Alkylhydroxysulfobetaine, alkylamidocarboxybetaine, alkylamidosulfobetaine, alkylamidohydroxy 8-24 amphoteric surfactants alkyl carbon atoms such as Ruhobetain is preferably used. The surfactant is preferably contained in the aqueous cleaning agent in an amount of 0.01 to 1.0% by weight, particularly 0.05 to 0.5% by weight in terms of cleaning properties and finish of the surface to be cleaned. .

  Examples of the alkaline agent include hydroxides such as sodium hydroxide, carbonates such as sodium carbonate, alkaline sulfates such as sodium hydrogen sulfate, phosphates such as primary sodium phosphate, sodium acetate, and sodium succinate. Organic alkali metal salts, alkanolamines such as ammonia, mono-, di- or triethanolamine, β-aminoalkanols such as 2-amino-2-methyl-1-propanol, morpholine, etc., particularly feel and pH buffering properties In this respect, alkanolamines such as mono-, di- or triethanolamine, β-aminoalkanols such as 2-amino-2-methyl-1-propanol, and morpholine are preferred. The alkali agent is preferably contained in the aqueous cleaning agent in an amount of 0.01 to 1% by weight, particularly 0.05 to 0.5% by weight, in terms of cleaning properties and feel.

  Examples of thickeners include natural polysaccharides, semi-synthetic polymers such as cellulose polymers and starch polymers, other synthetic polymers such as vinyl polymers and polyethylene oxide, and water-soluble polymers such as clay minerals. It is done. Particularly preferred are polyacrylic acid thickeners, acrylic acid / alkyl methacrylate copolymer thickeners or mixtures thereof having low stickiness and nulliness. These acrylic thickeners preferably exhibit viscosity in the form of a sodium salt. The thickener is preferably contained in the aqueous cleaning agent in an amount of 0.01 to 2% by weight, particularly 0.02 to 1% by weight, in terms of the finish of the surface to be cleaned.

  As the water-soluble solvent, one or more selected from monohydric alcohols, polyhydric alcohols and derivatives thereof are preferable. In particular, a vapor pressure of 267 Pa (2 mmHg) or higher is preferable in terms of finish. For example, ethanol, isopropyl alcohol, propanol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether and the like are preferable. The water-soluble solvent is preferably contained in the aqueous cleaning agent in an amount of 1 to 50% by weight, particularly 1 to 20% by weight, from the viewpoint of reducing odor and skin irritation.

  In addition to the above-mentioned components, the aqueous cleaning agent can contain a disinfectant. Thereby, in addition to the cleaning effect, the sterilizing effect can be imparted to the aqueous cleaning agent. Disinfectants include hydrogen peroxide, hypochlorous acid, sodium hypochlorite, quaternary ammonium salts, sodium benzoate, sodium paraoxybenzoate, natural disinfectants, etc. From the viewpoint of disinfection performance, quaternary ammonium salts, natural disinfectant polylysine and the like are preferably used. The disinfectant is preferably contained in the aqueous detergent in an amount of 0.005 to 2% by weight, particularly 0.01 to 1% by weight, from the viewpoint of the balance between the disinfecting effect and the reduction of skin irritation.

  Further, the aqueous detergent may contain a fragrance, an antifungal agent, a coloring matter (dye or pigment), a chelating agent, a wax agent, or the like.

  Water, which is a medium for the aqueous cleaning agent, is preferably contained in the aqueous cleaning agent in an amount of 50 to 99.9% by weight, particularly 80 to 99% by weight, from the viewpoint of the finish of the surface to be cleaned.

  Considering the cleaning performance and the sustained release property of the cleaning agent, the impregnation rate of the aqueous cleaning agent is preferably 100 to 500% by weight with respect to the wet sheet 10 before the impregnation. From the viewpoint of further improving the cleaning property, the impregnation ratio of the aqueous cleaning agent is more preferably 200 to 400% by weight. The impregnation rate of the sheet 10 with the aqueous cleaning agent is measured under no load with respect to the weight of the sheet 10 after impregnating the aqueous cleaning agent and removing the excess aqueous cleaning agent as it is or by mangle treatment. The

The wet sheet 10 having an impregnation ratio in the above range has an aqueous detergent release amount of 0.001 to 0.02 g / 100 cm ² under a load of 400 gf / 100 cm ² , particularly 0.001 to 0.01 g / It is preferably 100 cm ² , especially 0.002 to 0.01 g / 100 cm ² . By setting the release amount within this range, the stain stain removal property is improved, and the operability when the wet sheet 10 is attached to the mop-shaped cleaning tool for cleaning can be improved. The amount of cleaning agent released is measured by the method shown in FIG. That is, the wet sheet 10 impregnated with a predetermined amount of the aqueous cleaning agent is cut into a size of 100 × 100 mm without being compressed. The wet sheet 10 is placed on an acrylic plate 200 having a size of 110 × 110 mm. A weight 201 (400 g) having a bottom surface of 100 × 100 mm is placed on the wet sheet 10 and allowed to stand for 1 minute, then the weight 201 and the wet sheet 10 are removed, and the cleaning agent released onto the acrylic plate 200. Measure the amount immediately with a balance.

  Next, a preferred method for manufacturing the wet sheet 10 shown in FIGS. 1 and 2 will be described with reference to FIG. In the method for manufacturing the wet sheet 10 of the present embodiment, a polymerization process for polymerizing the upper layer fiber web 11a and the lower layer fiber web 11b on each surface of the mesh sheet 12, respectively, and between the constituent fibers of the fiber webs 11a and 11b by hydroentanglement. Entangling to form a fiber assembly and entanglement of the constituent fibers with the mesh sheet 12 to form a laminated body 13 in which these are integrated, and unevenness imparting unevenness to the laminated body 13 The provision process proceeds in this order.

  The manufacturing apparatus 50 shown in FIG. 5 is roughly divided into a superposition part 60, an entanglement part 70, an unevenness imparting part 80, and a dehydration part 90. The superposition unit 60 includes card machines 61 and 62 for producing the fiber webs 1la and 1lb, feed rolls 63 and 63 for the fiber webs l1a and l1b, and a net-like sheet feed roll 64, respectively. The entangled portion 70 includes a drum 71 having a water permeable peripheral surface and a plurality of first water jet nozzles 72 configured to inject a high-pressure water stream toward the peripheral surface of the drum 71. . The unevenness imparting unit 80 includes a drum 81 whose peripheral surface is water permeable, and a plurality of second water jet nozzles 82 which are configured to inject a high-pressure water stream toward the peripheral surface of the drum 81. Yes. The dehydrating unit includes a suction box 91.

  In FIG. 6, the main part of the unevenness imparting part 80 is shown enlarged. On the peripheral surface of the drum 81, a first patterning member 83 having a large number of uneven portions is provided along the peripheral surface. On the first patterning member 83, a second patterning member 84 having a large number of openings is installed along the peripheral surface of the drum 81.

  The 1st patterning member 83 in the uneven | corrugated provision part 80 is further demonstrated, referring FIG. 7 (a)-FIG.7 (c). 7A is an enlarged plan view of a main part of the first patterning member 83, FIG. 7B is a cross-sectional view taken along the line bb in FIG. 7A, and FIG. It is a cc line sectional view in a). The first patterning member 83 is composed of a linear wire material 83a and a spiral wire material 83b. The linear linear members 83a have a cross section of, for example, a circle or an ellipse, and are arranged so that a plurality of the linear members are positioned in parallel with each other at equal intervals. Further, the linear linear members 83a are preferably arranged so as to be positioned on the same plane. One spiral linear material 83b is wound around two adjacent linear linear materials 83a. The winding direction and winding pitch of adjacent spiral linear members 83b are the same. The spiral linear member 83b has a cross-sectional shape in which two linear members having a circular cross section of the same diameter are integrated in parallel. Of course, one or three or more linear materials may be used. The spiral linear member 83b has a line connecting the centers of the two linear members in the cross section, and the linear member 83a is linear at any position of the spiral linear member 83b. It is wound so that it is parallel to. The spiral linear material 83b may be circular or elliptical in cross section. Both linear members 83a and 83b are made of metal or synthetic resin.

  As shown in FIG. 7C, the spiral linear member 83b is wound so as to draw an ellipse when viewed from the axial direction of the winding. In this case, the spiral linear material 83b is wound so that the major axis of the ellipse is parallel to the array surface of the linear linear materials 83a. The spiral linear member 83b may be wound so as to draw a circle or a triangle.

  As shown in FIG. 7 (b), the spiral linear member 83b has a number of highest portions 83d on the upper surface side with the arrangement surface 83c of the linear linear member 83a as a reference plane. On the other hand, a plurality of minimum portions 83e are provided on the lower surface side thereof, whereby the first patterning member 83 has a number of uneven portions. The convex portion in the first patterning member 83 is a position indicated by reference numeral 83f in FIG. 7B, that is, the highest portion 83d and a position in the vicinity thereof. On the other hand, the concave portion in the first patterning member 83 is a position indicated by reference numeral 83g in FIG. 7B, that is, a position between two adjacent highest portions 83d.

The interval _ap between the linear linear members 83a adjacent to each other in the first patterning member 83 determines the length of the convex portion 31 in the manufactured wet sheet 10. Also, one cycle length of the winding in the spiral linear member 83b (pitch) b _p determines a pitch of the convex portion 31 of the wet sheet 10 to be manufactured, the width of the cross section of the spiral linear member 83b b _d determines the width of the convex portion 31. Furthermore, the winding diameter (elliptical minor axis) b _{h of} the spiral linear material 83b determines the thickness of the convex portion 22 of the wet sheet 10 to be manufactured.

The width a _d of the linear wire 83a is preferably 0.5 to 5 mm, more preferably 1 to 3 mm, and the pitch _ap is preferably 2 to 20 mm, more preferably 3 to 15 mm. The width b _d of the spiral linear member 83b is preferably 0.5 to 10 mm, more preferably 1 to 6 mm, and the winding pitch b _p is preferably 1 to 12 mm, more preferably 2 to 7 mm. is there. Further, the winding diameter (short diameter) b _h of the spiral linear member 83b is preferably 3 to 18 mm, and more preferably 5 to 15 mm. When each value in both the linear members 83a and 83b is within the above range, a sufficient uneven shape can be imparted to the convex portion 22 of the obtained wet sheet 10. The first patterning member 83 preferably has a certain thickness. Specifically, the thickness of the first patterning member 83 is 3 to 25 mm, particularly 5 to 15 mm, and can impart a sufficiently high bulk, and the provision of unevenness. This is preferable from the viewpoint of energy efficiency.

  In FIG. 8, the second patterning member 84 in which the second patterning member 84 in the unevenness imparting portion 80 is shown is a plate-like body having a rhombic lattice shape. A portion surrounded by the lattice is a rhomboid opening 84a. That is, the second patterning member 84 has a large number of openings 84a. Apart from the openings 84a, a large number of through holes 84b are regularly provided in the lattice portion. The through hole 84b is smaller than the opening 84a. The second patterning member 84 is made of metal such as stainless steel or plastic, for example. In view of durability, it is preferably made of metal.

  In the manufacturing apparatus 50 having such a configuration, first, the fiber webs 1la and l1b are continuously fed from the card machines 61 and 62 in the superposition unit 60 through the feeding rolls 63 and 63, respectively. On the other hand, a roll 12a of the reticulated sheet 12 is disposed between the card machines 61 and 62, and the reticulated sheet 12 is fed out from a feed roll 64 of the roll 12a. The fiber webs 1la and 1lb are overlapped on both sides of the mesh sheet 12 to form the polymer 65.

  In the entanglement section 70, the polymer 65 is entangled by a high-pressure jet water stream ejected from the first water jet nozzle 72 while being held on the peripheral surface of the water-permeable drum 71. As a result, the constituent fibers of the fiber webs 1la and 1lb in the polymer 65 are intertwined to form a fiber assembly. At the same time, the constituent fibers are intertwined with the mesh sheet 12 to obtain a laminate 13 in which these are integrated. The laminate 13 is a spunlace nonwoven fabric that includes the mesh sheet 12 therein. In this case, it is preferable that the fiber which comprises the fiber assembly in the laminated body 13 is a low entanglement state. The entangled state is 0.05 to 2 N · m / g, particularly 0.2 to 1.2 N · m / g, expressed as an entanglement coefficient. By controlling the entanglement state of the fibers constituting the fiber assembly in the laminated body 13 within this range, a clear uneven shape was imparted without generating a hole or the like when the unevenness imparting portion 80 described later was given unevenness. A wet sheet for cleaning can be obtained. When this cleaning wet sheet is used as, for example, a cleaning sheet, fibrous dust such as hair can be collected and held satisfactorily.

  The entanglement coefficient is a scale representing an entangled state between constituent fibers, and is represented by an initial gradient of a stress-strain curve in a direction perpendicular to the fiber orientation in the fiber assembly 11 of the integrated laminate 13. It can be said that the smaller the is, the weaker the entanglement between the fibers. At this time, the fiber orientation is a direction in which the maximum point load value at the time of the tensile strength test is maximized, and the stress is the width by which the tensile load is grasped (the width of the test piece at the time of the tensile strength test) and the basis weight of the fiber assembly 11. The value is divided, and the strain indicates the amount of elongation.

  In FIG. 5, the high-pressure jet water flow is jetted only on one surface of the polymer 65 and the entanglement treatment is performed. Instead, the jet water flow is jetted on each surface of the polymer 65, You may perform a confounding process from the surface.

  The laminated body 13 is arranged on the unevenness shaping member 80 in which the second patterning member 84 is installed on the first patterning member 83 in the unevenness imparting portion 80. Under the state of being arranged on the shaping member, a high-pressure jet water stream is jetted from the second water jet nozzle 82 toward the laminated body 13 to partially pressurize the laminated body 13. This state is shown in FIG. As shown in FIG. 9, the fiber assembly in the laminate 13 is placed in the concave portion of the first patterning member 83 exposed in the opening 84 a (see FIG. 8) of the second patterning member 84 in the laminate 13. A part of protrudes. The protruding portion is a portion located on the concave portion 83g (see FIG. 7) of the first patterning member 83. As a result, the protruding portion becomes a small recess 32 corresponding to the recess 83g. A portion located on the convex portion 83f (see FIG. 7) is not projected, and takes a small convex portion 31. In this way, the convex protrusion 22 having the small protrusion 31 and the small recess 32 is formed. By projecting the fiber aggregate to form the convex portion 22, the fiber density of the convex portion 22 is lower than that before jetting the jet water flow.

  On the other hand, the fiber assembly located on the second patterning member 84 in the laminated body 13 is regulated by the second patterning member 84 even if it receives jet of a high-pressure jet water flow. However, in the portion of the through hole 84b (see FIG. 8) formed in the second patterning member 84, the fiber assembly protrudes due to the injection of the high-pressure jet water flow. Thus, the recessed part 21 which has many small convex-shaped parts 41 is formed. In the concave portion 21 where the protrusion of the fiber assembly is restricted, the fiber density thereof hardly changes from that before jetting the jet water flow.

  By the operation as described above, the fiber sheet 10a provided with the uneven shape is obtained. The shape or the like of the small convex portion 31 in the convex portion 22 is determined according to the type of the first patterning member 83 and the entangled energy applied to the fiber assembly by the high-pressure jet water flow in the entangled portion 70 and the unevenness imparting portion 80. This entanglement energy is controlled by conditions such as the nozzle shape of the water jet nozzle, nozzle pitch, water pressure, number of nozzle stages (lines), and line speed.

  The obtained fiber sheet 10a is dehydrated by a suction box 91 installed in the dehydrating unit 90, further dried and wound up. The fiber sheet 10a is in a continuous sheet state, which may be wound into a roll or may be cut into a required length. Finally, the fiber sheet 10a is impregnated with a predetermined amount of a cleaning agent having a predetermined composition, and the intended wet sheet 10 is obtained. In addition, the confounding coefficient of the fiber assembly 11 of the convex portion 22 provided with concavities and convexities in the fiber sheet 10a is approximately the same as the confounding coefficient before provision of concavities and convexities, that is, 0.05 to 2 N · m / g. It is preferably 2 to 1.2 N · m / g.

  As described above, according to the present manufacturing method, by using various combinations of the first patterning member 83 and the second patterning member 84, it is possible to easily obtain the wet sheet 10 provided with a desired uneven shape. it can.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the concave and convex portions are formed on only one surface of the fiber assembly 11 to form the concave portions 21 and the convex portions 22, but the concave and convex portions are formed on each surface of the fiber assembly 11 instead. , The concave portions 21 and the convex portions 22 may be formed on each surface of the fiber assembly 11.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, “%” means “% by weight”.

[Example 1]
The wet sheet shown in FIGS. 1 and 2 was manufactured using the manufacturing apparatus shown in FIGS. The raw materials used are as shown in Table 1 below. Further, the aqueous cleaning agent is water / ethanol / 2-amino-2-methyl-1-propanol / dodecylglucoside (condensation degree 1.4) / thickening agent (Carbopol ETD2020, manufactured by Nikko Chemical Co.) = 93.73. /6/0.1/0.1/0.07 (weight ratio) (viscosity: 500 mPa · s / 25 ° C.). Carbopol ETD2020 is an acrylic acid / alkyl methacrylate (C10-30) copolymer. The non-volatile residual component of the aqueous cleaning agent was 0.17%. The impregnation ratio of the aqueous cleaning agent was 350% by weight. About the obtained sheet | seat, the static friction resistance value and the discharge | release amount of the aqueous cleaning agent under 400 gf / 100cm < ² > load were measured by the above-mentioned method. Moreover, the collection method of the hair, the operativity of the wiper, the surface fluff prevention property, and the amount of the 1st mat of the cleaning agent released were measured by the following methods. The results are shown in Table 1.

[Hair collection rate]
A sheet was mounted on a quick wiper (manufactured by Kao Corporation) so that the concavo-convex shape faced outward. Five hairs of about 10 cm were spread on a 30 cm × 60 cm flooring (Woodish tile MT613T manufactured by Matsushita Electric Works), and a sheet was placed on top of it and cleaned twice in a fixed stroke (60 cm) and collected on the sheet. The number of hairs was measured. This operation was carried out 6 times in succession to determine how many of 30 hairs were collected. The number of collected hairs was divided by 30 and multiplied by 100 to obtain the value as the hair collection rate (%).

[Wiper operability]
Wiper operability when attaching a sheet to a quickle wiper (manufactured by Kao Corporation) so that the uneven shape faces outward and wiping the flooring board (Wooday tile E type KER501 made by Matsushita Electric Works) with one hand Was evaluated according to the following criteria.
○: Wipe lightly with one hand, and wiper cleaning unit head does not float even when turning when pulling.
○ to Δ: Wipe lightly with one hand, but wiper cleaning head may slightly float even during turn.
Δ: A force is required to start pushing the wiper, and the cleaning unit head of the wiper may float slightly.
X: Very strong force is required when starting to push the wiper, and the cleaning unit head may be turned upside down during the turn.

[Prevention of surface fluff removal]
A friction test was mechanically performed on the surface of the sheet on which the concavo-convex shape was formed, and evaluation was performed based on the following criteria based on the amount of the fiber that had fallen off.
○: Almost no dropout and no problem.
Δ: Slightly dropped.
X: It falls off considerably.

[Amount released of 1st mat of cleaning agent]
The amount of cleaning liquid released per tatami when a sheet was mounted on a quick-leak wiper manufactured by Kao Co., Ltd. so that the concavo-convex shape was directed outward and the flooring was wiped 6 tatami mats was measured. The amount of cleaning liquid was measured by removing the sheet from the cleaning unit head and measuring its weight each time one tatami mat was wiped. In the cleaning method, one stroke of wiping at a distance of about 90 cm was taken as one stroke, and two rows were wiped in the longitudinal direction (180 cm) of one tatami mat and four rows in the lateral direction (90 cm) to complete the cleaning of one tatami mat.

[Comparative Example 1]
A sheet was obtained in the same manner as in Example 1 except that the second patterning member was not used. The sheet is not formed with a recess 21. About the obtained sheet | seat, the measurement similar to Example 1 was performed. The results are shown in Table 1.

  As is clear from the results shown in Table 1, the sheet of Example 1 has a higher hair collection rate and better operability of the wiper than the sheet of Comparative Example 1, and the fluffing of fibers and fibers It can be seen that the omission is difficult to occur. Moreover, it turns out that the sustained release property of a cleaning agent is high.

DESCRIPTION OF SYMBOLS 10 Cleaning wet sheet 11 Fiber assembly 11a, 11b Fiber web 12 Reticulated sheet 21 Concave part 22 Convex part 31 Small convex part 32 Small concave part 41 Small convex part

Claims (6)

Comprising a fiber assembly formed by hydroentangling a fiber web, the fiber assembly being impregnated with an aqueous cleaning agent,
At least one surface of the fiber assembly has a number of convex portions formed by entanglement of the constituent fibers of the fiber assembly, and concave portions having a shape surrounding the convex portions,
The one surface of the fiber assembly is a cleaning wet sheet having a static friction resistance value of 900 to 2500 cN with respect to sandpaper (particle size # 1200). The wet sheet for cleaning according to claim 1, wherein the area of each convex portion is 1 to 15 cm ² and the area ratio of the concave portions is 10 to 70%. The aqueous detergent impregnation rate is 100 to 500% by weight with respect to the wet sheet before impregnation,
400 gf / 100 cm ² cleaning wet sheet according to claim 1 or 2, wherein the released amount of the aqueous detergent under load is 0.001~0.02g / 100cm ^2.   The wet sheet for cleaning according to any one of claims 1 to 3, wherein a net-like sheet is arranged inside the fiber aggregate, and the constituent fibers of the fiber aggregate are entangled with the net-like sheet.   The wet sheet for cleaning according to any one of claims 1 to 4, wherein a plurality of small convex portions and small concave portions are formed in the convex portion.   The wet sheet for cleaning according to any one of claims 1 to 5, wherein the fiber assembly includes hydrophilic synthetic fibers.

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