JP4448509B2 - Kitchen paper - Google Patents

Description

  The present invention relates to kitchen paper, and more particularly, to kitchen paper excellent in oil absorption.

In kitchens, kitchens, etc., so-called kitchen paper made of paper or non-woven fabric is widely used. Kitchen paper can be used for a wide variety of purposes, such as food packaging, boiled food lids, drip absorbents such as fresh fish, water draining, oil simmering, absorption of excess oil in fried foods, and wiping around kitchens. Therefore, kitchen paper is generally formed by appropriately stacking embossed sheets of crepe paper, nonwoven fabric, etc., and mainly absorbs liquids by capillary action due to gaps between the sheet fibers. The mechanism is configured to take in and hold moisture, oil, and the like in the gaps between the embossments of each sheet.
JP 2001-146665 A JP 2005-132710 A

However, the conventional products are often sufficient for the absorption rate of water having a low viscosity, but the absorption rate of oil having a higher viscosity than water is often not sufficient. For example, when fried food is used, kitchen paper may be placed on the pad to be picked up by the fried food in order to absorb excess oil. However, the oil absorption rate is not sufficient at that time, and oil from the fried food often accumulates on the sheet. It is done.
Therefore, the main problem of the present invention is excellent oil diffusibility on the sheet surface, can retain oil in a wide range of the sheet, has a large amount of oil absorption, and the oil is quickly moved to the gap between the sheets, To provide kitchen paper.

The present invention and effects obtained by solving the above problems are as follows.
<Invention of Claim 1>
A kitchen paper made by laminating a plurality of sheets,
Sheets constituting the front and back are sheets made from pulp,
The sheet constituting the surface is embossed, the basis weight is 15 to 60 g / m ² , the sheet density is less than 0.14 g / cm ³ ,
Der sheet density of the sheet is 0.14 g / cm ³ or more that constitute the back side is,
The sheet constituting the surface is coated or impregnated with a C6-C12 and saturated triglyceride,
Kitchen paper characterized by that.

<Invention of Claim 2>
The kitchen paper of Claim 1 by which the embossing was carried out to the sheet | seat which comprises front and back, and the embossed top part given to each sheet | seat is adhere | attached.

<Invention of Claim 3>
The kitchen paper of Claim 1 by which the sheet | seat which comprises front and back is embossed, and the top part and bottom part of the embossing which were given to each sheet | seat are adhere | attached.

<Invention of Claim 4>
The kitchen paper according to any one of claims 1 to 3, wherein an adhesion area ratio between the top sheet and the back sheet is 3 to 20%.

In the present invention, the sheet constituting the surface is embossed, the basis weight is 15 to 60 g / m ² , the sheet density is less than 0.14 g / cm ^3, and the sheet density of the sheet constituting the back surface is 0.14 g / cm ² . By setting it as cm < ³ > or more, the improvement of the oil absorption amount, the rapid movement of the oil to the gap between sheets, and the retention of the oil in the gap are enhanced. In addition, since the sheet density is lower than that of the sheet constituting the back surface, it is possible to improve the oil penetration prevention property while ensuring good oil absorption performance on the top sheet side.
Preferably, the dry tensile strength in the vertical direction of the topsheet is 2500 cN or less, and the dry tensile strength in the horizontal direction is 700 cN or less.
Furthermore, if the sheet | seat which comprises front and back is made into a pulp raw material, it can manufacture at low cost.
Embossing is performed on the sheets constituting the front and back surfaces, and the relationship between the embosses of each sheet is applied to the so-called “Tip to Tip” type or each sheet, in which the tops of the embossments applied to each sheet are bonded together. When the so-called “Nested” type in which the top and bottom of the embossed material are bonded together, a gap is surely formed between the sheets, and the oil retention is further improved.
In adhering the top sheet and the back sheet, it is desirable that the adhesion area ratio is 3 to 20% because the sheets can be reliably adhered to each other and the influence of the liquid absorption inhibition by the adhesion portion is small. In addition, the effect of hardening by the adhesive is small, and the softness by the embossing can be sufficiently secured, and the influence of the oil absorption inhibition by the bonded portion is also small.
Further, when the sheet constituting the surface is coated or impregnated with a C6-C12 and saturated triglyceride, an effect of further improving the oil absorption performance is obtained.
As described above, according to the present invention, the diffusibility of oil on the sheet surface is excellent, the oil content can be retained in a wide range of the sheet, the oil absorption amount is large, and the oil is quickly moved to the gap between the sheets. Kitchen paper is provided.

Next, embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of the kitchen paper X1 of this embodiment.
The kitchen paper X1 of this embodiment is formed by laminating a plurality of sheets 1 and 2, and the sheets constituting the front and back surfaces are sheets made from pulp, and both are embossed. In addition, in this form X1 of illustration, although the 2 layer structure of only the surface sheet 1 and the back surface sheet 2 is taken, in this invention, a suitable number of intermediate | middle layers can also be interposed between front and back sheets. Moreover, the sheet | seat which comprises a back surface does not necessarily need to be embossed.
Each component of this kitchen paper is not limited, but it can be melted even if it comes into contact with a hot oil of about 200 ° C in consideration of absorption of excess oil such as deep-fried food and use of hot oil. It is desirable to use a material that does not denature or deteriorate.
As the sheets 1 and 2 constituting the front and back surfaces, a nonwoven fabric using pulp fibers, a laminated fiber pulp sheet, a thin paper, a sheet made of pulp such as crepe paper, etc., from among sheet types that can be used for kitchen paper Selected. Of course, the seat design is based on the configuration of the present invention. As a raw material of the sheet, synthetic fibers and the like can be used in addition to pulp, but pulp is most suitable in consideration of ease of production and cost.
The front and back sheets 1 and 2 do not need to be made of the same material, and a configuration in which different sheet types are combined as appropriate can be adopted.

The basis weight of the kitchen paper X1 as a whole is preferably 30 g / m ² or more and 120 g / m ² or less in terms of flexibility and strength. More preferably, it is 50 g / m ² or more and 100 g / m ² or less. If the basis weight is too small, the strength becomes insufficient and the embossing effect is difficult to be exhibited, and the liquid retainability is lowered. On the other hand, if the basis weight is too large, the flexibility decreases.
The kitchen paper X1 of this embodiment is characteristic in the relationship between the basis weight of the top sheet and the sheet density with the sheet constituting the back surface. First, the basis weight (weight per unit area) of the top sheet 1 has a relatively high basis weight as one layer of kitchen paper. Specifically, it is 15 g / m ² or more and 60 g / m ² or less. Preferably at 20 g / m ² or more 40 g / m ² or less. If the basis weight is too small, even if embossed e, e. On the other hand, if the basis weight is too large, the flexibility is lowered or the rigidity becomes large and difficult to handle when bending.

Next, the sheet density of the top sheet is configured to be lower than the sheet density of the sheet constituting the back surface. As a result, oil is quickly received from the surface of the top sheet and moved into the gap between the sheets, and the moved oil is held in the gap.
And about the sheet density of a specific surface sheet, it is less than 0.14 g / cm < ³ > comparatively low as a kitchen paper single layer. If the sheet density is higher than 0.14 g / cm ³ , oil diffusibility cannot be obtained, and the absorption rate decreases. The lower limit of the sheet density is preferably 0.01 g / cm ³ or more in consideration of strength.
By adopting the basis weight and sheet density of the surface sheet, kitchen paper having an unprecedented oil absorption rate and oil retention can be obtained.

  Here, in particular, the top sheet should have a relatively high tensile strength as a single layer of kitchen paper, specifically, the dry tensile strength in the longitudinal direction is 2500 cN or less, and the transverse direction. The dry tensile strength is preferably 700 cN or less. When the dry tensile strength is excessively high, flexibility is lowered. Moreover, when too low, the shape retainability of embossing will fall, for example, there exists a possibility that embossing may collapse | crumble at the time of oil absorption. By setting it as such tensile strength, the mobility of the oil to a reliable space | gap and the retainability of oil and water are improved. The dry tensile strength of the present invention is based on JIS P8113.

On the other hand, the back sheet preferably has a basis weight similar to that of the top sheet, that is, 15 g / m ² or more and 60 g / m ² or less. The basis weight is more preferably 20 g / m ² or more and 50 g / m ² or less.
The sheet density of the back sheet is preferably higher than that of the top sheet, that is, 0.14 g / cm ³ or more. The upper limit of the sheet density is preferably 0.50 g / cm ³ or more in consideration of softness and the like.
By setting it as the basic weight and sheet density of this back surface sheet, a back-through prevention property is effectively expressed by the relationship with the said surface sheet. Further, the embosses e, e,... Can be clearly and clearly imparted and are not easily broken.

The sheet thickness of each sheet is preferably about 200 μm or more and less than 300 μm for the front sheet, and 100 μm or more and less than 200 μm for the back sheet.
On the other hand, the raw material pulp of each sheet is, for example, wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, etc., and more specifically, groundwood pulp (GP), stone ground pulp (SGP), refiner ground pulp ( RGP), pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached chemithermomechanical pulp (BCTMP) and other mechanical pulp (MP), chemical mechanical pulp (CGP) Kraft pulp (KP) such as semi-chemical pulp (SCP), hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), soda pulp (AP), sulfite pulp (SP), dissolved pulp (DP) Chemical pulp (CP) such as nylon, rayon, polyester, poly Synthetic pulp made from nil alcohol (PVA), ground pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie etc. Raw pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, One or several types can be appropriately selected and used from stalk-and-paste pulp such as kenaf pulp and auxiliary pulp such as bast pulp.

These raw pulps are, for example, based on a known papermaking technique, specifically through a wire part, a press part, a dryer part, a creping part, a size press, a calendar part, etc. And
When making paper, for example, a suitable agent such as a pH adjuster such as a dispersant, caustic soda, or aqueous ammonia, an antifoaming agent, an antiseptic, a fluorescent dye, a mold release agent, a water-resistant agent, a flow modifier, and a yield improver Can be added.

  Here, in producing the above-mentioned characteristic surface sheet, it can be achieved by adjusting the freeness (CSF) of raw material pulp slurry to 600 cc or more and further using a papermaking raw material to which a softening agent is added. This freeness value is extremely low in beating compared with a papermaking raw material of a general kitchen paper sheet. With such freeness, the surface sheet can be designed to have the basis weight, sheet density, and dry tensile strength shown above. As the softening agent, a softening agent such as a known surfactant can be used, and cationic surfactants, particularly fatty acid esters and fatty acid amides are particularly suitable.

  On the other hand, the sheet constituting the surface layer is preferably coated or impregnated with a C6-C12 saturated triglyceride. Thereby, the improvement effect of the diffusibility and absorption rate of one layer of oil is provided to the surface sheet 1. As a method for incorporating triglyceride into the nonwoven fabric sheet, a known method for internally or externally adding a drug to the sheet can be used. For example, in the case of internal addition, a method of papermaking raw pulp or raw pulp slurry added with triglyceride can be employed. If it is an external addition, after forming a sheet | seat, the method of spraying, apply | coating, and applying a triglyceride can be taken. If spraying, a known spray device that sprays the drug on the sheet can be used, and if coating is performed, a known coating machine or printing machine can be used.

The method for laminating and bonding the sheets 1 and 2 is not particularly limited, but preferably after embossing or embossing is applied to the sheet, and a method of laminating the sheet on the facing sheet and bonding with an adhesive may be adopted. it can. For example, PVA (polyvinyl alcohol), CMC (carboxyl methylcellulose), starch, and the like are suitable for use in bonding between sheets.
Here, the adhesion area ratio between the top sheet and the back sheet, that is, the ratio of the area of the adhesion part to the sheet area (one side) is preferably in the range of 3 to 20%. If it is this range, the influence of the hardening by an adhesive agent will be small, and the softness by embossing can fully be ensured, and the influence of the oil absorption inhibition by an adhesion part is also small.
As a method of applying the adhesive 3, a method of spraying, applying, and applying can be employed. If spraying, a known spray device that sprays the drug on the sheet can be used, and if coating is performed, a known coating machine or printing machine can be used.

Here, in this embodiment, the embossing relationship between the two sheets is such that the top portions t, t... Of the embossed e, e. Although the so-called “Tip to Tip” form is employed, the present invention is not limited to this, and it is also possible to adopt a so-called “Nested” form in which the top part of the embossing of the top sheet and the bottom part of the back sheet are bonded. In particular, the “Tip to Tip” form is excellent in terms of large voids and high oil retention, and the “Nested” form is excellent in terms of oil diffusibility. In addition, the top part t is the top surface of the convex part which protrudes so that it may approach, seeing from the sheet | seat which faces, and the bottom part is the bottom face of the recessed part which dents so that it may space apart seeing the sheet | seat to face.
The embossing performed on the sheet can be performed, for example, by passing the embossed sheet between a pair of embossing rolls. Both of the pair of embossing rolls can be metal rolls, but one is preferably an elastic roll made of rubber or the like, and the other is preferably a metal roll having an embossing projection. The combination of the elastic roll and the metal roll is preferable because there is no problem of adjustment of the clearance of the roll or problems such as clogging of paper dust or the like in the roll.

On the other hand, embossing can be performed with a pair of embossing rolls heating both or one embossing roll. When the embossing roll is heated, the embossing is given more clearly and clearly.
The heated embossing roll may be an elastic roll, but is preferably a metal roll. This is because the metal roll has better thermal conductivity and the effect of heating is exhibited effectively, and when the metal roll is heated, the sheet is heated in a form corresponding to the shape of the emboss. This is because the embossing given becomes clearer and clearer.
In this case, the surface temperature of the heating roll is such that the pair of embossing rolls are both metal rolls, a combination of an elastic roll and a metal roll, which of the elastic roll and the metal roll is heated, etc. Regardless, it is set to 40 to 140 ° C, preferably 60 to 120 ° C, more preferably 80 to 100 ° C. If the heating temperature is too low, the effect that the embossing becomes clear may not be sufficiently exhibited. On the other hand, if the heating temperature is too high, energy loss may occur, the sheet may be seized, and the manufactured sheet may be hardened.

The embossing is performed so that the embossing pressure between the pair of embossing rolls is 5 to 30 kg / cm, preferably 10 to 25 kg / cm, more preferably 15 to 20 kg / cm. If the embossing pressure is too low, the effect that the embossing becomes clear may not be sufficiently exhibited. On the other hand, if the embossing pressure is too high, the processed base paper may be torn.
When the pair of embossing rolls is a combination of an elastic roll and a metal roll, the elastic roll preferably has a Shore hardness of 40 to 70 on the surface thereof. If the Shore hardness is too low, that is, if the elastic roll surface is too soft, the sheet or the sheet fabric may be broken. On the other hand, if the Shore hardness is too high, that is, if the surface of the elastic roll is too hard, there is a possibility that embossing does not enter.
On the other hand, the specific shape of the emboss is an appropriate design matter. In the embossing of the present embodiment shown in the figure, the shape of the top is square, and the shape of the recess between adjacent tops is trapezoidal. The shape of the top portion may be a rhombus, a circle, an ellipse, a polygon, etc. in addition to a square.
Moreover, it is preferable that a top part is made flat if each sheet | seat is adhere | attached with an adhesive agent. Area of the top portion, 0.1~40mm ^2, more preferably 0.25~4.0mm ^2, particularly preferably 0.5 to 2.0 mm ^2. It becomes impossible to obtain sufficient adhesive strength between sheets, where the top area is too narrow. On the other hand, if the area of the top is too large, the volume of the absorption space due to embossing becomes small, so that sufficient absorption capacity cannot be obtained.
The depth D of the embosses e, e... Is also an appropriate design item, but is generally about 1.0 mm or more, preferably 1.3 mm or more.
An emboss pattern formed by a large number of embosses e, e... Is also an appropriate design item, and conventionally known emboss patterns can be appropriately employed in consideration of aesthetics and functionality.

In the above-described form X1, the two-layer structure of only the front and back sheets 1 and 2 can be a multilayer structure of three or more layers. In this case, the pulp layer as an intermediate layer between the sheets constituting the front and back surfaces Is preferably provided. A pulp layer can be formed by interposing a pulp sheet between front and back sheets. When the pulp layer is provided, the liquid retention is increased. When the pulp layer is provided, the pulp constituting the pulp layer is not limited, but it is desirable to use a pure pulp containing no filler, and it is particularly desirable to use a pulp containing more NBKP than LBKP. That is, the ratio of NBKP: LBKP is set to 50:50 to 100: 0. Preferably, 70:30 to 100: 0. Since NBKP tends to be thicker than LBKP, the more NBKP is bulky. And the absorption rate of the water | moisture content and oil which adhered to the front and back sheet | seat becomes quick, and the holding amount also increases. In particular, the fiber length of the LBKP is 0.8 to 1.8 mm, the fiber thickness is 1.0 to 2.0 dtex, the fiber length of the NBKP is 2.5 to 4.5 mm, and the fiber thickness is 3 It is preferable to use a pulp having a viscosity of 0.0 to 4.0 dtex. When the fiber length of NBKP is set to 2.5 to 4.5 mm and the fiber thickness is set to 3.0 to 4.0 dtex, the water absorption speed and the oil absorption speed are further improved while the bulk is increased. Moreover, when the fiber length of LBKP is 0.8 to 1.8 mm and the fiber thickness is 1.0 to 2.0 dtex, it is arranged so as to be appropriately entangled with the NBKP fiber and to fill the gap of the NBKP fiber, and is soft Becomes better, and the holding power of moisture and oil becomes better.
In the kitchen paper of the present invention described in detail above, the oil is sufficiently and quickly diffused on the surface sheet surface and is quickly moved to the inter-sheet gap, and the oil is effective between the gaps due to the back-through prevention by the back sheet. Therefore, the oil absorption performance is extremely excellent.

About the Example of this invention, the prior art example (conventional product), and the comparative example, it tested about the oil absorption amount, the oil penetration amount, the oil absorption speed, and the water absorption amount.
First, we measure the weight of unused and dried kitchen paper, lay the kitchen paper on the vat, and then use 170 ° C salad oil on the laid kitchen paper (Nisshin Oillio Group Co., Ltd.) The fried food fried for 5 minutes (commercial frozen croquette; “TOPVALU Baron croquette” sold by AEON Co., Ltd.) was taken and placed for 1 minute. Thereafter, the fried food was removed, the weight of the kitchen paper was measured, and the value obtained by subtracting the weight of the previous unused state from this measured value was defined as the oil absorption. In each example, the top sheet was laid on the bat so that the top sheet was on the upper side, and the fried food was taken up on the top sheet.
For the amount of oil penetration, the weight of the bat before placing the kitchen paper was measured, and after removing the fried food and the kitchen paper in the oil absorption amount test, the weight of the bat was measured again. The value obtained by subtracting the weight of the bat before placing the previous kitchen paper from the weight of the bat was defined as the oil penetration amount.
The oil absorption rate was evaluated in three stages based on visual observation at the time when 1 cc of salad oil (manufactured by Nisshin Oillio Group Co., Ltd.) was dropped on the side surface of the kitchen paper. The evaluation criteria are 1 (bad) for 1 minute or more, and 2 (ordinary) for a period of 1 minute or longer until the glossiness due to the dripped oil disappears from the sheet surface. ), Those less than 30 seconds were evaluated as 3 (good).
The amount of water absorption was determined by measuring the weight of a dry paper sample cut to 100 mm square, sufficiently immersing the paper sample in pure water, then lifting the pure water and measuring the weight after 30 seconds. The value obtained by subtracting the weight in the dry state from the measured value was taken as the amount of water absorption.
In addition, the kitchen paper concerning each example was set as the two-layer structure which bonded together the front and back sheet | seat with the adhesive agent except the comparative example 3. FIG. The adhesive in Examples and Conventional Examples is PVA. Further, except for Comparative Example 3, the sheet was made of thin paper on both sides, and the embossed shape was rectangular in all examples.
The triglyceride was a medium chain fatty acid having 8 to 10 carbon atoms, the amount of rice was measured based on JIS P 8124, and the dry tensile strength was measured based on JIS P 8113.
In addition, the composition and test results of the kitchen paper of each example are as shown in Table 1.

As is clear from the results in Table 1, it can be seen that the Examples of the present invention have a larger oil absorption than the Comparative Examples and the Conventional Examples.
In addition, the amount of oil penetration is very small compared to the conventional example and the comparative example. From this, it is considered that the structure of this example allows the oil to be quickly moved into the gap by the surface sheet made of the nonwoven fabric, and the oil is effectively held in the gap.
Regarding the oil absorption rate, it is recognized that the examples of the present invention are superior to the comparative examples except the comparative example 3 and the conventional examples. In Comparative Example 3, although the oil absorption amount and the oil absorption speed were fast, a sticky feeling on the surface was recognized because the oil was not held in the gap.
On the other hand, the amount of water absorption is higher than that of the comparative example and the conventional example. Also, the strength when wet is sufficient. In Comparative Example 3, although the amount of water absorption was large, there was not much holding power, and water dripping was observed even after measurement.
When it sees, it can be said that about the Example of this invention, it has the performance which is equivalent or superior to a prior art example about water absorption, and it was shown that it was the performance excellent in each step | stage about oil absorption performance.

  As described above, according to the present invention, a kitchen paper excellent in oil absorbability is provided.

  In addition to kitchen paper, the present invention can be used for sheet-like materials for the purpose of wiping off oil.

It is a cross-sectional enlarged view of the kitchen paper of this invention.

  DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... Back sheet, e ... Emboss, t ... Top part of emboss, X1 ... Kitchen paper.

Claims (4)

A kitchen paper made by laminating a plurality of sheets,
Sheets constituting the front and back are sheets made from pulp,
The sheet constituting the surface is embossed, the basis weight is 15 to 60 g / m ² , the sheet density is less than 0.14 g / cm ³ ,
Der sheet density of the sheet is 0.14 g / cm ³ or more that constitute the back side is,
The sheet constituting the surface is coated or impregnated with a C6-C12 and saturated triglyceride,
Kitchen paper characterized by that.   The kitchen paper of Claim 1 by which the embossing was carried out to the sheet | seat which comprises front and back, and the embossed top part given to each sheet | seat is adhere | attached.   The kitchen paper of Claim 1 by which the sheet | seat which comprises front and back is embossed, and the top part and bottom part of the embossing which were given to each sheet | seat are adhere | attached.   The kitchen paper according to any one of claims 1 to 3, wherein an adhesion area ratio between the top sheet and the back sheet is 3 to 20%.

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