JP2016222343A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container capable of surely preventing water intrusion from an atmosphere introduction hole and capable of avoiding the adverse effect due to water intrusion into an intermediate space between an outer shell and an inner bag.SOLUTION: There is provided a double container which has an outer shell and an inner bag and is configured so that the inner bag contracts with reduction of a content. An air introduction hole is formed on the outer shell, and a hydrophobic filter putting through the air and blocking water is provided to block the air introduction hole. The hydrophobic filter is prepared, for example, by a nonwoven fabric of polypropylene or a laminate of a hydrophobic microporous membrane and the nonwoven fabric. In the case of using the nonwoven fabric of polypropylene, a basis weight is preferably 160 g/mto 250 g/m. The atmosphere introduction hole may be equipped with a valve member controlling air to enter and exit between an outer space, and the intermediate space between the outer shell and the inner bag.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a double container, and more particularly, to a technique for preventing water from entering from an air introduction hole.

  Conventionally, a container main body having an outer shell and an inner bag and shrinking as the contents are reduced, and an air flow between an intermediate space between the outer shell and the inner bag and an outer space of the container main body. 2. Description of the Related Art A double container (so-called laminated peeling container) including a check valve that adjusts access is known (see, for example, Patent Documents 1 and 2).

  In the delamination container disclosed in Patent Document 1, a valve is built in a cap attached to the mouth of the container body. In the delamination container disclosed in Patent Document 2, a valve is provided inside the body portion of the outer shell.

JP 2013-35557 A JP-A-4-267727

  By the way, the delamination container is often used as a food container, and after filling the contents at a high temperature, shower cooling is often performed for cooling. Shower cooling is a method in which water is sprayed in the shower to cool the container. However, when such a cooling method is adopted, the water on the container is sucked from the air introduction hole, and between the outer shell and the inner bag. There is a high possibility of entering the space. If water enters the intermediate space, bacteria and the like may propagate, which is not preferable in terms of food hygiene. Further, the water that has entered may adversely affect the operation of the valve.

  The present invention has been made in view of such conventional circumstances, and even when shower cooling or the like is performed, water can be reliably prevented from entering from the air introduction hole, and the outer shell and the inner shell can be prevented. An object of the present invention is to provide a double container that can avoid the adverse effects of water entering the intermediate space between the bags.

  In order to achieve the above-mentioned object, the double container of the present invention is a double container having an outer shell and an inner bag, and the inner bag shrinks as the contents contained in the inner bag decrease. An air introduction hole is formed in the outer shell, and a hydrophobic filter that transmits air and blocks water is provided so as to close the air introduction hole.

  For example, a hydrophobic filter such as a nonwoven fabric made of polypropylene has a property of allowing air to pass therethrough but not allowing water to pass. Since the hydrophobic filter does not allow water to pass, even if water is splashed by shower cooling or the like, water does not enter the intermediate space between the outer shell and the inner bag through the air introduction hole. On the other hand, since the hydrophobic filter allows air to pass therethrough, it does not prevent air from entering and exiting through the air introduction hole.

  According to the present invention, even when shower cooling or the like is performed, water can be reliably prevented from entering from the air introduction hole, and water can enter the intermediate space between the outer shell and the inner bag. It is possible to provide a double container that can avoid adverse effects.

It is a perspective view which shows the structure of the double container of one Embodiment of this invention. It is a schematic sectional drawing of the double container shown in FIG. It is sectional drawing which shows the layer structure of an outer layer and an inner layer. It is a principal part schematic perspective view which expands and shows the atmosphere introduction hole vicinity. It is a principal part schematic sectional drawing which expands and shows the atmosphere introduction hole vicinity. It is a schematic sectional drawing which shows an example of a hydrophobic filter. It is a principal part schematic sectional drawing which shows an example of the rib formed in the attachment part of a hydrophobic filter. An example of the double container which has a valve member is shown It is a perspective view which shows the various structures of a valve member. It is principal part sectional drawing which shows the example which provided the hydrophobic filter in the air introduction hole which has a valve member. The valve member which has a leaf | plate spring part is shown, (a)-(b) is a perspective view of the valve member which has a leaf | plate spring part, (c) is a front view of the valve member which has a leaf | plate spring part, (d). (E) is a front view (outer shell is sectional drawing) which shows the state which attached the valve member which has a leaf | plate spring part to the external air introduction hole. It shows an example of a spherical valve member, (a) is a front view of the cylindrical body, (b) is a bottom view of the cylindrical body, (c) is an AA sectional view, (d) is a BB sectional view. (E) is a cross-sectional view of the valve member, (f) is a cross-sectional view showing a state in which the valve member is mounted on the outer layer, and (g) is a state in which the moving body abuts against the stopper portion and closes the cavity portion. It is sectional drawing shown. It is principal part sectional drawing which shows the example which provided the hydrophobic filter in the air introduction hole provided with the valve member shown in FIG. It is a figure which shows the usage method of a double container.

  Hereinafter, an embodiment of a double container to which the present invention is applied will be described. Each characteristic item shown in the embodiment described below can be combined with each other.

  As shown in FIG. 1, a double container 1 according to an embodiment of the present invention is a so-called delamination container and mainly includes a container main body 2, and the container main body 2 is a storage portion that stores contents. 3 and a mouth part 4 for discharging the contents from the storage part 3. As shown in FIG. 2, the container body 2 includes an outer layer 11 that is an outer shell and an inner layer 12 that is an inner bag in the accommodating portion 3 and the mouth portion 4. Contracts.

  The outer layer 11 and the inner layer 12 are subjected to blow molding as a multi-layer parison and are molded in a state of being integrally joined. For example, the inner layer 12 is peeled from the outer layer 11 in advance before use. The contents are filled until the inner layer 12 contacts the outer layer 11. By pushing out the contents, the inner layer 12 contracts smoothly. Alternatively, the inner layer 12 may remain bonded to the outer layer 11, and the inner layer 12 may be peeled from the outer layer 11 and contracted as the contents are discharged.

  The layer structure of the container body 2 will be further described. The container body 2 includes the outer layer 11 and the inner layer 12 as described above, and the outer layer 11 is formed to be thicker than the inner layer 12 so as to be highly recoverable. Yes.

  The outer layer 11 is composed of, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, an ethylene-propylene copolymer, and a mixture thereof. The outer layer 11 has a single layer or a plurality of layers, and preferably contains a lubricant in at least one of the innermost layer and the outermost layer. When the outer layer 11 has a single layer configuration, the single layer is the innermost layer and the outermost layer, and therefore, a lubricant may be contained in the layer. When the outer layer 11 has a two-layer structure, the inner layer layer is the innermost layer, and the outer layer layer is the outermost layer, so that at least one of them may contain a lubricant. When the outer layer 11 is composed of three or more layers, the innermost layer is the innermost layer, and the outermost layer is the outermost layer. As shown in FIG. 3, the outer layer 11 preferably includes a repro layer 11c between the innermost layer 11b and the outermost layer 11a. The repro layer refers to a layer that is used by recycling burrs that are produced when a container is molded. When the outer layer 11 has a multi-layer structure, it is preferable to contain a lubricant in both the innermost layer and the outermost layer.

  As the lubricant, those generally marketed as a lubricant can be used, and any of hydrocarbon-based, fatty acid-based, aliphatic amide-based, metal soap-based may be used, and two or more types may be used in combination. Good. Examples of the hydrocarbon lubricant include liquid paraffin, paraffin wax, and synthetic polyethylene wax. Examples of fatty acid lubricants include stearic acid and stearyl alcohol. Examples of the aliphatic amide-based lubricant include fatty acid amides of stearic acid amide, oleic acid amide, and erucic acid amide, and alkylene fatty acid amides of methylene bis stearic acid amide and ethylene bis stearic acid amide. Examples of metal soap lubricants include metal stearates.

  The innermost layer of the outer layer 11 is a layer in contact with the inner layer 12, and the peelability between the outer layer 11 and the inner layer 13 can be improved by including a lubricant in the innermost layer of the outer layer 11. On the other hand, the outermost layer of the outer layer 11 is a layer that comes into contact with the mold during blow molding, and the release property can be improved by containing a lubricant in the outermost layer of the outer layer 11.

  One or both of the innermost layer and the outermost layer of the outer layer 11 can be formed of a random copolymer between propylene and another monomer. Thereby, the shape restoration property, transparency, and heat resistance of the outer layer 11 that is the outer shell can be improved.

  The random copolymer has a content of monomers other than propylene of less than 50 mol%, and preferably 5 to 35 mol%. Specifically, this content is, for example, 5, 10, 15, 20, 25, 30 mol%, and may be within a range between any two of the numerical values exemplified here. The monomer copolymerized with propylene may be any monomer that improves the impact resistance of the random copolymer when compared with a polypropylene homopolymer, and ethylene is particularly preferable. In the case of a random copolymer of propylene and ethylene, the ethylene content is preferably 5 to 30 mol%, specifically, for example, 5, 10, 15, 20, 25, 30 mol%, and the numerical values exemplified here It may be within the range between any two. The weight average molecular weight of the random copolymer is preferably from 100,000 to 500,000, more preferably from 100,000 to 300,000. Specifically, the weight average molecular weight is, for example, 10, 15, 20, 25, 30, 35, 40, 45, 500,000, and is within a range between any two of the numerical values exemplified here. Also good.

  The tensile modulus of the random copolymer is preferably 400 to 1600 MPa, and preferably 1000 to 1600 MPa. This is because the shape restoring property is particularly good when the tensile elastic modulus is in such a range. Specifically, the tensile elastic modulus is, for example, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600 MPa, and between any two of the numerical values exemplified here It may be within the range.

  Note that if the container is excessively hard, the feeling of use of the container is deteriorated. Therefore, the outer layer 11 may be configured by mixing a random copolymer with a flexible material such as linear low density polyethylene. However, the material to be mixed with the random copolymer is preferably mixed so as to be less than 50% by weight with respect to the whole mixture so as not to significantly inhibit the effective characteristics of the random copolymer. For example, the outer layer 11 can be made of a material in which a random copolymer and linear low-density polyethylene are mixed at a weight ratio of 85:15.

  The inner layer 12 includes an EVOH layer 13a provided on the container outer surface side, an inner surface layer 12b provided on the container inner surface side of the EVOH layer 12a, and an adhesive layer 12c provided between the EVOH layer 12a and the inner surface layer 12b. . By providing the EVOH layer 12a, the gas barrier property and the peelability from the outer layer 11 can be improved.

  The EVOH layer 12a is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of ethylene and vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, and preferably 32 mol% or less from the viewpoint of oxygen barrier properties. Although the minimum of ethylene content is not prescribed | regulated, since the softness | flexibility of EVOH layer 12a tends to fall, so that ethylene content is small, 25 mol% or more is preferable. The EVOH layer 12a preferably contains an oxygen absorbent. By containing the oxygen absorbent in the EVOH layer 12a, the oxygen barrier property of the EVOH layer 12a can be further improved.

  The melting point of the EVOH resin is preferably higher than the melting point of the random copolymer constituting the outer layer 11. The outside air introduction hole 15 is preferably formed in the outer layer 11 using a heating type punching device, but the outside air introduction hole 15 is formed in the outer layer 11 by making the melting point of the EVOH resin higher than the melting point of the random copolymer. When forming, the hole is prevented from reaching the inner layer 13. From this point of view, the difference between (the melting point of EVOH) − (the melting point of the random copolymer layer) should be large, preferably 15 ° C. or higher, and particularly preferably 30 ° C. or higher. The difference in melting point is, for example, 5 to 50 ° C., specifically, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 ° C., and any of the numerical values exemplified here. Or within a range between the two.

  The inner surface layer 12b is a layer that comes into contact with the contents of the double container 1, for example, a polyolefin such as a low density polyethylene, a linear low density polyethylene, a high density polyethylene, a polypropylene, an ethylene-propylene copolymer, and a mixture thereof. It is preferably made of low-density polyethylene or linear low-density polyethylene. 50-300 MPa is preferable and, as for the tensile elasticity modulus of resin which comprises the inner surface layer 12b, 70-200 MPa is preferable. This is because the inner surface layer 13b is particularly flexible when the tensile elastic modulus is in such a range. The tensile modulus is specifically, for example, specifically, for example, 50, 100, 150, 200, 250, 300 MPa, and may be within a range between any two of the numerical values exemplified here. .

  The adhesive layer 12c is a layer having a function of adhering the EVOH layer 12a and the inner surface layer 12b. For example, an acid-modified polyolefin in which a carboxyl group is introduced into the above-described polyolefin (eg, maleic anhydride-modified polyethylene) is added. And ethylene vinyl acetate copolymer (EVA). An example of the adhesive layer 12c is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.

  The layer structure of the container main body 2 is as described above. In the container main body 2, a male screw part is provided in the mouth part 4, and a cap (lid) having a female screw is attached to the male screw part (illustrated). Is omitted). If a cap having an inner ring is used, the outer surface of the inner ring abuts against the abutment surface of the mouth portion 4, thereby preventing leakage of contents.

  Further, in the shoulder portion of the accommodating portion 3, a concave portion 7 a is formed in the outer layer 11, and an air introduction hole 15 is formed therein. The air introduction hole 15 is a through hole provided only in the outer layer 11 and does not reach the inner layer 12. Then, air is introduced from the air introduction hole 15, whereby an intermediate space 21 is formed between the outer layer 11 that is an outer shell and the inner layer 12 that is an inner bag. That is, the intermediate space 21 and the external space S are communicated with each other by the atmosphere introduction hole 15.

  In the double container (laminated peeling container) of the present embodiment, as shown in FIGS. 4 and 5, the hydrophobic filter F is attached so as to close the air introduction hole 15, whereby the air introduction hole 15. To prevent water from entering.

  For example, in a container for food use, the delamination container often employs shower cooling for cooling after so-called hot-packing. When shower cooling is performed after hot pack, there is a possibility that a negative pressure is generated between the outer layer 11 and the inner layer 12 and water is sucked from the air introduction hole 15.

  The hydrophobic filter F has a property of repelling water, and by adhering it, water can be prevented from entering from the air introduction hole 15. As the hydrophobic filter F, after discharging by squeeze, air must be introduced between the outer layer 11 and the inner layer 12 from the atmosphere introduction hole 15 in order to restore the outer layer, and a large amount of air can be passed. It is preferable to use a filter.

The characteristics required for the hydrophobic filter F are, for example, as follows.
(1) Air is allowed to pass but water (liquid) is not allowed to pass (2) Since the role similar to that of the air introduction valve is necessary, it is better that the air permeability is less. However, if air is not allowed to pass through at all, air does not enter between the outer layer 11 and the inner layer 12, which is inappropriate. It is also necessary to consider the balance of breathability.
(3) When mounting by ultrasonic welding, the material should be suitable for ultrasonic welding (no fine powder should be generated during ultrasonic welding).
By using the hydrophobic filter F that satisfies these requirements, it is possible to control internal pressure maintenance during squeeze and external air introduction during restoration.

From such a viewpoint, as the hydrophobic filter F, for example, a nonwoven fabric made of polypropylene is preferable. Since the nonwoven fabric made of polypropylene is hydrophobic, it repels water and has good air permeability. In particular, it is preferable that polypropylene nonwoven basis weight is ^{160g / m 2 ~250g / m 2} , the basis weight of in this range ensures a good air permeability, possible to reliably prevent water from entering Can do.

Alternatively, the hydrophobic filter F may be a laminate of a hydrophobic microporous membrane and a nonwoven fabric. FIG. 6 shows an example of a hydrophobic filter F in which a hydrophobic microporous membrane F1 and a nonwoven fabric F2 are laminated. In this two-layered hydrophobic filter F, the hydrophobic microporous membrane F1 is a membrane formed of polyethylene terephthalate (PET), polycarbonate, or the like, with pores formed therein. And liquids do not penetrate. The pores formed in the microporous membrane F1 penetrate the membrane at various angles, and the shape thereof is cylindrical. The density of the pores is about 10 ⁵ to 10 ⁹ / cm ² , and the diameter of the pores is about 0.1 μm to 10 μm.

  In the microporous membrane F1, pores are formed by first subjecting a membrane formed of polyethylene terephthalate (PET) or polycarbonate to ion bombardment by heavy ion bombardment and then chemical etching. Can be formed. By applying ion bombardment, scratches are formed on the surface of the membrane, and pores are formed by chemical etching starting from the scratches.

  In the hydrophobic filter F shown in FIG. 6, the non-woven fabric F2 is reinforced by being lined with the microporous membrane F1. The material of the non-woven fabric F2 can be arbitrarily selected. For example, a non-woven fabric made of hydrophobic polypropylene can be used.

As the hydrophobic filter F in which the hydrophobic microporous membrane F1 and the nonwoven fabric F2 are laminated, a commercially available filter can be used. Examples thereof include trade names M2657 and RoTrac manufactured by Oxyphen. . The air permeability and thickness of representative examples of hydrophobic filters (both made from polyethylene terephthalate) are as follows.
・ Oxifen, product name M2657:> 3.3 l / (min cm ² bar), t = 155 ± 40 μm
・ Oxifen, product name R5587:> 6.5 l / (min cm ² bar), t = 155 ± 40 μm
・ Oxifen, product name M2810: 8 ± 2.5 l / (min cm ² bar), t = 140 ± 40 μm
・ Oxifen, product name M2803: 17.5 ± 3.8 l / (min cm ² bar), t = 140 ± 40 μm
・ Oxifen, product name M2802: 35 ± 8 l / (min cm ² bar), t = 140 ± 40 μm

  Needless to say, the present invention is not limited to these, and any one that has good air permeability and water repellent properties can be used for the hydrophobic filter F.

  The hydrophobic filter F may be attached to a portion where the air introduction hole 15 of the double container is formed by adhesion or heat welding. However, for example, in the heat welding, the outer layer 11 constituting the double container may be melted. It is difficult to apply because there are. In addition, high-frequency welding requires a metal film serving as a heat source, and is difficult to apply to the attachment of the hydrophobic filter F.

  From such a viewpoint, the hydrophobic filter F is preferably attached to the double container by ultrasonic welding. In the ultrasonic welding, a horn is brought into contact with the back surface of the hydrophobic filter F, and ultrasonic welding and pressure can be applied to instantly weld.

  In addition, in the ultrasonic welding, the welded portion of the double container is soft, so that it is easy to dent, and it may be difficult to make the horn contact uniformly. In such a case, if the shape is maintained by blowing air into the double container and applying an internal pressure, the contact of the horn and the ultrasonic welding can be performed smoothly.

  Moreover, in ultrasonic welding, it is preferable to form a rib in the attachment part of the double container (outer layer 11). FIG. 7 shows how the rib R is formed on the outer layer 11 and the hydrophobic filter F is ultrasonically welded. For example, when the circular hydrophobic filter F is attached, the rib R may be formed in a circle around the atmosphere introduction hole 15 with a diameter slightly smaller than the diameter of the hydrophobic filter F. The height of the rib R is preferably 0.15 mm or more, for example, about 0.25 mm. By providing the rib R, it functions as an energy director and enables stable ultrasonic welding.

  Furthermore, if the inner layer 12 is in contact with the outer layer 11 during ultrasonic welding of the hydrophobic filter F, a hole may be formed in the inner layer 12 due to ultrasonic vibration. Therefore, in ultrasonic welding, it is preferable that the inner layer 12 escapes from the outer layer 11 in the vicinity of the attachment portion of the hydrophobic filter F.

  When the hydrophobic filter F is attached, the air introduction hole 15 is preferably 3 to 4 mm in diameter. If the diameter of the air introduction hole 15 is too small, the restoration of the outer layer 11 becomes worse. On the other hand, if the diameter of the air introduction hole 15 is too large, it is difficult to apply an internal pressure between the outer layer 11 and the inner layer 12 and it may be difficult to discharge. However, since the diameter of the air introduction hole 15 is also related to the air permeability of the hydrophobic filter F, it is preferable to set it appropriately in consideration of the air permeability of the selected hydrophobic filter F.

  The hydrophobic filter F described above is preferably attached so as to block the air introduction hole 15 even when the air introduction hole 15 is provided with a valve member. This is because when the valve member is simply attached, water easily enters when the water touches.

  FIG. 8 shows an embodiment of a double container (laminated peeling container) having a valve member. The configuration of the container body 2 is the same as that of the previous embodiment, and here, the atmosphere introduction hole 15 in which the valve member is installed will be described.

  In the present embodiment, the valve member 5 is inserted into the outside air introduction hole 15 and is slidably movable with respect to the outside air introduction hole 15. The valve member 5 is provided on the intermediate space 21 side of the shaft part 5 a and from the shaft part 5 a. In addition, a cover portion 5c having a large cross-sectional area and a locking portion 5b provided on the outer space S side of the shaft portion 5a and preventing the valve member 5 from entering the intermediate space 21 are provided.

  The lid portion 5c is configured to substantially close the outside air introduction hole 15 when the outer layer 11 is compressed, and has a shape in which the cross-sectional area decreases as the shaft portion 5a is approached. Moreover, the latching | locking part 5b is comprised so that air can be introduce | transduced into the intermediate | middle space 21 when decompress | restoring after the outer layer 11 is compressed. When the outer layer 11 is compressed, the pressure in the intermediate space 21 becomes higher than the external pressure, and the air in the intermediate space 21 leaks out from the outside air introduction hole 15. The lid 5c moves toward the outside air introduction hole 15 due to the pressure difference and the air flow, and the lid 5c closes the outside air introduction hole 15. Since the cross-sectional area becomes smaller as the lid portion 5 c approaches the shaft portion 5 a, the lid portion 5 c easily fits into the outside air introduction hole 15 and closes the outside air introduction hole 15.

  When the outer layer 11 is further compressed in this state, the pressure in the intermediate space 21 is increased. As a result, the inner layer 12 is compressed and the contents in the inner layer 12 are discharged. Further, when the compressive force applied to the outer layer 11 is released, the outer layer 11 tries to recover by its own elasticity. At this time, the lid portion 5 c is separated from the outside air introduction hole 15, the outside air introduction hole 15 is released from being blocked, and outside air is introduced into the intermediate space 21. Further, in order to prevent the locking portion 5b from blocking the outside air introduction hole 15, the locking portion 5b is provided with a protrusion 5d at a portion that comes into contact with the outer layer 11, and the protrusion 5d comes into contact with the outer layer 11 A gap is provided between the outer layer 11 and the locking portion 5b. Instead of providing the protrusion 5d, a groove may be provided in the locking portion 5b to prevent the locking portion 5b from closing the outside air introduction hole 15. A specific example of the configuration of the valve member 5 is shown in FIG.

  The valve member 5 can be mounted on the container body 2 by inserting the lid 5c into the intermediate space 21 while the lid 5c pushes the outside air introduction hole 15 wide. Therefore, it is preferable that the tip of the lid portion 5c has a tapered shape. Such a valve member 5 is excellent in productivity because it can be mounted simply by pushing the lid 5c into the intermediate space 21 from the outside of the container body 2.

  The accommodating portion 3 is covered with a shrink film after the valve member 5 is attached. At this time, the valve member 5 is mounted in the mounting recess 7 a provided in the housing portion 3 so that the valve member 5 does not interfere with the shrink film. Further, an air flow groove 7b extending from the mounting recess 7a in the direction of the mouth 4 is provided so that the mounting recess 7a is not sealed with the shrink film.

  When the valve member 5 as described above is attached, for example, as shown in FIG. 10, the mounting recess 7a has a two-stage structure, the valve member 5 is attached to the lower stage 7c, and the hydrophobic filter F is attached to the upper stage 7d. Intrusion of water from the air introduction hole 15 can be reliably prevented.

  The valve member 5 is not limited to the above example, and may have various functions and forms. For example, the valve member which has a leaf | plate spring part shown in FIG. 11 is the one.

As shown in FIGS. 11A and 11B, the valve member 35 having a leaf spring portion is inserted into the outside air introduction hole 15 and is slidable with respect to the outside air introduction hole 15. The lid portion 35c provided on the intermediate space 21 side of the shaft portion 35a and having a larger cross-sectional area than the shaft portion 35a, and the valve member 35 provided on the outer space S side of the shaft portion 35a and entering the intermediate space 21. The locking part 35b to prevent is provided. The locking portion 35b includes a pair of base portions 35b1 and a bridge portion (corresponding to a leaf spring portion) 35b2 provided between the base portions 35b1. The shaft portion 35a is provided in the bridge portion 35b2.

  The lid portion 35c is configured to substantially close the outside air introduction hole 15 when the outer layer 11 is compressed, and has a shape including a tapered surface 35d so that the cross-sectional area decreases as the shaft portion 35a is approached. . The inclination angle β of the tapered surface 35d shown in FIG. 11C is preferably 15 to 45 degrees with respect to the direction D in which the shaft portion 35a extends, and more preferably 20 to 35 degrees. This is because if the inclination angle β is too large, air leakage tends to occur, and if it is too small, the valve member 35 becomes long.

  Further, as shown in FIG. 11 (d), the locking portion 35b is configured such that the base portion 35b1 contacts the outer layer 11 at the contact surface 35e and the bridge portion 35b2 bends in a state of being attached to the outside air introduction hole 15. The According to such a configuration, a restoring force in a direction away from the container is generated in the bridge portion 35b2 as indicated by an arrow FO, and thereby an urging force in the same direction acts on the lid portion 5c, so that the lid portion 5c becomes the outer layer 11. Pressed against.

  Air is introduced into the intermediate space 21 when the outer layer 11 is restored after being compressed. In this state, the lid 35c is only lightly pressed against the outer shell 12, but when the outer layer 11 is compressed, the pressure in the intermediate space 21 becomes higher than the external pressure, and the air in the intermediate space 21 is outside air. It leaks outside through the introduction hole 15. Due to the pressure difference and the air flow, the lid part 35 c is pressed more strongly against the outside air introduction hole 15 and moves toward the outside air introduction hole 15, and the lid part 35 c closes the outside air introduction hole 15. Since the lid portion 35c is provided with a tapered surface 35d having a cross-sectional area that decreases as it approaches the shaft portion 35a, the lid portion 35c easily fits in the outside air introduction hole 15 and closes the outside air introduction hole 15.

  When the outer layer 11 is further compressed in this state, the pressure in the intermediate space 21 is increased. As a result, the inner layer 12 is compressed and the contents in the inner layer 12 are discharged. Further, when the compressive force applied to the outer layer 11 is released, the outer layer 11 tries to recover by its own elasticity. At this time, the inner space 21 is depressurized as the outer layer 11 is restored, so that a force FI in the container inner direction is applied to the lid 35c as shown in FIG. 11 (e). As a result, the bending of the bridge portion 35b2 increases and a gap Z is formed between the lid portion 35c and the outer layer 11, and passes through the passage 35f, the outside air introduction hole 15, and the gap Z between the bridge portion 35b2 and the outer layer 11. The lid portion 35 c is separated from the outside air introduction hole 15, the outside air introduction hole 15 is released from being blocked, and outside air is introduced into the intermediate space 21. Further, the locking portion 35b is provided with a projection 35d at a portion that contacts the outer layer 11 so that the locking portion 35b does not block the outside air introduction hole 15, and the projection 35d contacts the outer layer 11 A gap is provided between the outer layer 11 and the locking portion 35b. Instead of providing the protrusion 35d, a groove may be provided in the locking portion 35b to prevent the locking portion 35b from closing the outside air introduction hole 15.

  The valve member 35 can be attached to the container body 2 by inserting the lid 35 c into the intermediate space 21 while the lid 35 c pushes the outside air introduction hole 15. Therefore, it is preferable that the tip of the lid portion 35c has a tapered shape. Such a valve member 35 can be mounted simply by pushing the lid 35c into the intermediate space 21 from the outside of the container body 2, and thus is excellent in productivity. Further, the valve member 35 having a leaf spring portion can also be molded by injection molding or the like using a split mold having a simple configuration that is split in the direction of the arrow X along the parting line L shown in FIG. So it is excellent in productivity.

  Alternatively, as shown in FIG. 12, the valve member includes a cylindrical body 45 having a hollow portion 45g provided so as to allow communication between the external space S and the intermediate space 21, and movement accommodated in the hollow portion 45g. The body 46 may be provided. The cylindrical body 45 and the moving body 46 are formed by injection molding or the like, and the moving body 46 is pushed into the hollow portion 45g so as to get over a stopper portion 45h described later, thereby arranging the moving body 46 in the hollow portion 45g. be able to. In the present embodiment, the hollow portion 45g has a substantially cylindrical shape, and the moving body 46 has a substantially spherical shape, but may have a different shape as long as the same function as that of the present embodiment can be realized. . The diameter of the hollow portion 45g in the cross section (the cross section in FIG. 12D) is slightly larger than the diameter in the corresponding cross section of the moving body 46, and the moving body 46 is shown by the arrow in FIG. The shape is freely movable in the D direction. The ratio value defined by the diameter of the cross section of the cavity 45g / the diameter of the cross section corresponding to the moving body 46 is preferably 1.01 to 1.2, and more preferably 1.05 to 1.15. If this value is too small, smooth movement of the moving body 46 is hindered. If this value is too large, the gap between the surface 45j surrounding the cavity 45g and the moving body 46 becomes too large, and the container body 2 is compressed. This is because the force applied to the moving body 46 tends to be insufficient.

  The cylindrical body 45 includes a shaft portion 45 a disposed in the outside air introduction hole 15, a locking portion 45 b provided on the outer space S side of the shaft portion 45 a and preventing the cylindrical body 45 from entering the intermediate space 21, It has an enlarged diameter portion 45 c provided on the intermediate space 21 side of the portion 45 a and preventing the cylindrical body 45 from being pulled out from the outside of the container body 2. The shaft portion 45a is tapered toward the intermediate space 21 side. That is, the outer peripheral surface of the shaft portion 45a is a tapered surface. The cylindrical body 45 is attached to the container main body 2 when the outer peripheral surface of the shaft portion 45 a is in close contact with the edge of the outside air introduction hole 15. With such a configuration, the gap between the edge of the outside air introduction hole 15 and the cylindrical body 45 can be reduced. As a result, when the container main body 2 is compressed, the air in the intermediate space 21 becomes free from the outside air introduction hole 15. Outflow from the gap between the edge and the cylinder 45 can be suppressed. In addition, since the cylindrical body 45 is mounted on the container main body 2 by the outer peripheral surface of the shaft portion 45a being in close contact with the edge of the outside air introduction hole 15, the expanded diameter portion 45c is not necessarily essential.

  The surface 45j surrounding the hollow portion 45g is provided with a stopper portion 45h that locks the moving body 46 when the moving body 46 moves from the intermediate space 21 side toward the external space S side. The stopper portion 45h is configured by an annular protrusion, and when the moving body 46 comes into contact with the stopper portion 45h, the air flow through the hollow portion 45g is blocked.

  The tip of the cylinder 45 is a flat surface 45d, and the flat surface 45d is provided with an opening 45e that communicates with the cavity 45g. The opening 45e has a substantially circular central opening 45e1 provided at the center of the flat surface 45d, and a plurality of slits 45e2 radiating from the central opening 45e1. According to such a configuration, the flow of air is not hindered even when the moving body 46 is in contact with the bottom of the cavity 45g.

  As shown in FIG. 12 (f), the valve member 44 is inserted into the outside air introduction hole 15 from the expanded diameter portion 45 c side and pushed into a position where the locking portion 45 b contacts the outer surface of the outer layer 11. The outer peripheral surface of 45a is held by the outer layer 11 in a state of being in close contact with the edge of the outside air introduction hole 15. When the outer layer 11 is compressed in a state where air is contained in the intermediate space 21, the air in the intermediate space 21 enters the hollow portion 45g through the opening 45e, and pushes up the moving body 46 to contact the stopper portion 45h. When the moving body 46 comes into contact with the stopper portion 45h, the air flow through the hollow portion 45g is blocked.

  When the outer layer 11 is further compressed in this state, the pressure in the intermediate space 21 is increased. As a result, the inner layer 12 is compressed and the contents in the inner layer 12 are discharged. Further, when the compressive force applied to the outer layer 11 is released, the outer layer 11 tries to recover by its own elasticity. As the inner layer 21 is decompressed as the outer layer 11 is restored, a force FI in the container inner direction is applied to the moving body 46 as shown in FIG. As a result, the moving body 46 moves toward the bottom of the hollow portion 45g and enters the state shown in FIG. 12F, and the outside air enters the intermediate space 21 through the gap between the moving body 46 and the surface 45j and the opening 45e. Is introduced.

  The valve member 44 can be attached to the container body 2 by inserting the expanded diameter portion 45 c into the intermediate space 21 while the expanded diameter portion 45 c expands the outside air introduction hole 15. Therefore, it is preferable that the tip of the expanded diameter portion 45c has a tapered shape. Such a valve member 44 is excellent in productivity because it can be mounted simply by pushing the expanded diameter portion 45c into the intermediate space 21 from the outside of the container body 2. Since the flat surface 45d is provided at the tip of the cylindrical body 45, the inner layer 12 is hardly damaged even if the tip of the valve member 44 collides with the inner layer 12 when the valve member 44 is pushed into the intermediate space 21. It has become.

  When the valve member as shown in FIG. 12 is attached, for example, as shown in FIG. 13, the mounting recess 7a has a two-stage structure, the valve member 44 is attached to the lower stage 7c, and the hydrophobic filter F is attached to the upper stage 7d. By doing so, it is possible to reliably prevent water from entering from the air introduction hole 15.

  Next, the principle of operation when the double container 1 having the check valve 5 is used will be described.

  As shown in FIGS. 14 (a) to 14 (c), the product filled with the contents is tilted and the side surface of the outer layer 11 is gripped and compressed to discharge the contents. At the beginning of use, since there is substantially no gap between the inner layer 12 and the outer layer 11, the compressive force applied to the outer layer 11 becomes the compressive force of the inner layer 12 as it is, and the inner layer 12 is compressed and the contents are compressed. Discharged.

  The cap 23 incorporates a check valve (not shown) and can discharge the contents in the inner layer 12, but cannot take outside air into the inner layer 12. Therefore, if the compressive force applied to the outer layer 11 after discharging the contents is removed, the outer layer 11 tries to return to its original shape by its own restoring force, but the inner layer 12 remains deflated and only the layer 11 expands. Become. Then, as shown in FIG. 14 (d), the inside of the intermediate space 21 between the inner layer 12 and the outer layer 11 is in a reduced pressure state, and outside air is introduced into the intermediate space 21 through the outside air introduction hole 15 formed in the outer layer 11. . When the intermediate space 21 is in a depressurized state, the valve member 5 is not pressed against the air introduction hole 15, so that the introduction of outside air is not hindered.

  Next, as shown in FIG. 14 (e), when the side surface of the outer layer 11 is gripped again and compressed, the pressure in the intermediate space 21 is increased by the valve member 5 coming into contact with the air introduction hole 15 and closing. The compression force applied to the outer layer 11 is transmitted to the inner layer 12 through the intermediate space 21, and the inner layer 12 is compressed by this force and the contents are discharged.

  Next, as shown in FIG. 14 (f), when the compressive force applied to the outer layer 11 after the discharge of the contents is removed, the outer layer 11 introduces the outside air into the intermediate space 21 from the outside air introduction hole 15. The original shape is restored by the restoring force of.

  As mentioned above, although embodiment which applied this invention has been described, this invention is not limited to this embodiment, and it cannot be overemphasized that a various change is possible in the range which does not deviate from the summary of this invention. .

DESCRIPTION OF SYMBOLS 1 Double container 3 Container body 5 Valve member 7 Accommodating part 9 Portion part 11 Outer layer 12 Inner layer 15 Outside air introduction hole F Hydrophobic filter

Claims (5)

A double container having an outer shell and an inner bag, wherein the inner bag shrinks as the contents contained in the inner bag decrease;
An air introduction hole is formed in the outer shell, and a hydrophobic filter that transmits air and blocks water is provided so as to close the air introduction hole.   The double container according to claim 1, wherein the hydrophobic filter is formed of a polypropylene nonwoven fabric. Double container according to claim 2, wherein the basis weight of the nonwoven fabric of the polypropylene is a ^{160g / m 2 ~250g / m 2} .   The double container according to claim 1, wherein the hydrophobic filter is a laminate of a hydrophobic microporous membrane and a nonwoven fabric. The said air introduction hole is provided with the valve member which adjusts the entrance / exit of the air between the intermediate | middle space between an outer shell and an inner bag, and external space, The Claim 1 characterized by the above-mentioned. Double container.

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