JP2008068929A - Internal bag for bag-in-box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal bag for a bag-in-box allowing easy taking-out of a content by simply piercing the piercing cylinder of a pouring tool into a piercing sealing film being bonded to a spout. <P>SOLUTION: The bag 1 is formed in such a manner that the laminated films having a heat-bondable resin layer on the internal surface are stacked, and the outer peripheral edge sections are heat-bonded. An opening 3 is installed on one of the laminated films of the bag, and the spout is attached to the opening. Then, the piercing sealing film 5 is bonded to cover the spout as the constitution of the internal bag for the bag-in-box. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inner bag for a bag-in-box that can stab a piercing tube of a pouring tool into a piercing sealing film and take out the contents.

  Conventionally, in a bag-in-box type liquid container composed of an outer box and an inner bag, the connection part of the pouring tool for dispensing the contents is screwed or fitted to the outlet of the inner bag to maintain airtightness. In general, it is carried out by a method of mounting in the state. A plastic molded product is used for the spout attached to the inner bag for the bag-in-box, but the connection of the spout tool for taking out the contents is screwed or fitted to the spout to maintain airtightness. Since the structure of the spout is attached, the structure of the spout becomes complex and expensive, and the spout of the bag in the bag is restricted by the structure of the spouting tool that dispenses the contents, so there is no flexibility. There were disadvantages such as. Further, the dispensing tool for taking out the contents also has a drawback that it requires a connecting portion and has a complicated structure.

  The object of the present invention is that the contents can be taken out simply by piercing the piercing tube of the pouring tool into the piercing sealing film adhered to the pouring port, and the structure of the pouring tool is not restricted. An inexpensive bag-in-box inner bag having a high degree of freedom and a simple structure is provided.

  A bag formed by laminating a laminated film having a heat-adhesive resin layer on the inner surface and thermally adhering the outer peripheral edge portion, providing an opening in one laminated film of the bag, attaching a spout to the opening, An inner bag for a bag-in-box having a structure in which a puncture sealing film is adhered to cover an outlet. In this case, the bag-in-box type liquid container in which the bag-in-box inner bag is housed in the outer box and the outlet is fixed to the outer box is used, so that the piercing seal is adhered to cover the outlet. The contents can be easily taken out only by piercing the piercing tube of the pouring tool into the adhesive film. And since the airtightness in the piercing part of the piercing sealing film is securely maintained, the outside air does not enter the inner bag, and the inner bag is removed as the content is taken out and the amount of the content is reduced. When the contents are taken out, the inner bag is completely crushed and the contents can be taken out without leaving any contents. Further, even if the piercing tube is pierced with the liquid container turned upside down, the content does not leak out, so that the content can be taken out very easily.

  In the above bag-in-box inner bag, the piercing sealing film is any one of low density polyethylene, linear low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid monomer copolymer, and ionomer. These films, or the inner and outer layers are linear low density polyethylene and low density polyethylene, and the intermediate layer is medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid monomer copolymer, and ionomer. By using a multilayer film, the piercing property is excellent and the sealing performance at the piercing portion can be reliably maintained.

  In the inner bag for a bag-in-box described above, the puncture-sealing film has an excellent gas barrier property by having the gas-barrier resin layer laminated on the outer surface layer. The inner bag for a bag-in-box having excellent storage stability of the contents during transportation can be obtained.

  A bag formed by laminating a laminated film having a heat-adhesive resin layer on the inner surface and thermally adhering the outer peripheral edge portion, providing an opening in one laminated film of the bag, attaching a spout to the opening, A bag-in-box type liquid container in which the inner bag is stored in the outer box and the spout is fixed to the outer box because the inner bag for the bag-in-box is configured to cover the outlet and have a puncture sealing film adhered By doing so, the contents can be easily taken out only by piercing the piercing tube of the pouring tool into the piercing sealing film that covers and adheres the spout. And since the airtightness in the piercing part of the piercing sealing film is reliably maintained, the outside air does not enter the inner bag, and the inner bag is removed as the content is taken out and the amount of the content is reduced. When the volume of the inner bag is reduced by crushing, and the contents are further taken out, the inner bag is completely crushed and the contents can be taken out without leaving the contents. Further, even if the piercing tube is pierced with the liquid container turned upside down, the content does not leak out, so that the content can be taken out very easily. Inner bag for bag-in-box is made of low density polyethylene, linear low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid monomer copolymer, ionomer, inner layer The outer layer is made of linear low density polyethylene and low density polyethylene, and the intermediate layer is made of a multilayer film made of medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid monomer copolymer, or ionomer. Thus, the piercing performance is excellent and the sealing performance at the piercing portion can be maintained. In addition, since the piercing sealing film has a gas barrier resin layer laminated on the outer surface, the piercing sealing film has excellent gas barrier properties, so that the contents can be stored during storage and transportation. An excellent inner bag for a bag-in-box can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a folded plan view showing an embodiment of an inner bag for a bag-in-box according to the present invention, FIG. 2 is a sectional view taken along line II in FIG. 1, and FIG. 3 is a liquid using the inner bag for bag-in-box of the embodiment. It is sectional drawing which shows an example of the apparatus which takes out the contents from a paper container, 1 is an inner bag for bag in boxes, 11 is a laminated film, 2 is a peripheral thermal bonding part, 3 is an opening, 4 is a spout, 4a is Mounting flange, 5 is a piercing sealing film, 6 and 7 are heat bonding portions, 8 is an outer box, 9 is a pouring tool, 9a is a piercing tube, 10 is a take-out device, 10a is a support base, and 10b is a guide frame. To express.

  Embodiments of the inner bag for a bag-in-box according to the present invention are as shown in FIGS. As shown in FIG. 1, the planar shape of the folded state is formed by the peripheral thermal adhesive portion 2 provided on the outer peripheral portion by superimposing the thermal adhesive resin layer surface of the laminated film 11 having the thermal adhesive resin layer on the inner surface. It is a formed flat bag with a quadrangular four-side seal, in which one laminated film 11 is provided with an opening 3, and the spout 4 is bonded to the inner surface of the laminated film 11 from the inside of the opening 3. The piercing sealing film 5 is covered and adhered. In this embodiment, the shape of the bag is a quadrilateral flat bag with a four-side seal, but the shape of the bag is arbitrary and can be a three-side seal bag, a gusset bag, a self-supporting bag, or the like.

  As shown in FIG. 2, the cross-sectional shape of the portion where the spout 4 is attached to the opening 3 provided in the laminated film 11 is the attachment of the spout 4 with the spout 4 protruding outward from the laminated film 11. The flange 4a is attached to the inner surface of the laminated film 11 by being bonded to the heat-adhesive resin layer surface by the heat-bonding portion 6, and the piercing sealing film 5 is attached to the edge of the spout 4 so as to cover the spout 4 7 is attached by bonding. In the liquid container produced by attaching the inner bag 1 for bag-in-box of the present invention to the outer box, after filling the contents from the spout 4, the piercing sealable film 5 covers the spout 4 and the thermal bonding part 7. It can be attached by gluing. With this configuration, the contents can be easily taken out simply by piercing the piercing sealing film 5 with a piercing tube.

  A bag-in-box type liquid container using the bag-in-box inner bag 1 of the present invention is, for example, as shown in FIG. As the outer box 8 for storing the inner bag 1 for bag-in-box, a rigid paper box made of paperboard, cardboard or the like is used. When an inner bag having a large amount of contents to be stored is used, an outer box 8 having excellent strength such as a cardboard box is used. A cutout is provided in the outer box 8 at a position corresponding to the spout 4 of the inner bag, and the spout 4 portion of the inner bag is fixed to the outer box in a state where the spout 4 is fitted into the cutout. In order to fix the spout 4 of the inner bag to the outer box 8, the laminated film 11 around the spout 4 is adhered to the outer box with a hot melt adhesive or the like, or a fixture made of a separately prepared plastic molded product This can be done by fitting and fixing to the spout from the outside of the outer box. After the inner bag is stored in the outer box 8 and the spout 4 of the inner bag is fixed to the notch of the outer box 8, the contents are filled from the spout 4 and the piercing sealing film 5 is bonded to the spout 4 by thermal bonding. It is attached.

  As an apparatus for taking out the contents from the bag-in-box type liquid container using the bag-in-box inner bag 1 of the present invention, for example, the apparatus shown in FIG. 3 can be used. The take-out device 10 includes a support base 10a and a guide frame 10b, and an extraction tool 9 provided with a piercing tube 9a is attached to the support pedestal 10a so that the piercing tube 9a faces upward. The bag-in-box type liquid container in which the inner bag 1 for bag-in-box of the present invention is housed in the outer box 8 is turned upside down and inserted into the guide frame 10b and attached to the support base 10a. The piercing tube 9a of the pouring tool 9 thus pierced the piercing sealing film 5 adhered to cover the spout 4 of the inner bag of the liquid container, and entered the liquid container.

  In this state, the contents can be taken out by operating the pouring tool 9. Since the airtightness of the portion where the piercing tube 9a of the piercing sealing film 5 is pierced is reliably maintained, the outside air does not enter the inner bag, so the contents are taken out and the volume is reduced. Since the inner bag is crushed and the volume of the inner bag is reduced as time goes on, the contents can be taken out without leaving any residue. When the contents of the liquid container are removed, the used liquid container is removed and replaced with a new one. The take-out device 10 is not configured as described above, and the contents can be taken out using a pump device having a piercing tube. In the case of a liquid paper container using the inner bag 1 for bag-in-box of the present invention, it is preferably used in a place where a pouring device to which a pouring tool equipped with a piercing tube is attached is installed. It is the most suitable for commercial use. However, if a pouring tool equipped with a piercing tube is prepared, it can be used in ordinary households.

  The configuration of the laminated film 11 used for the inner bag for the bag-in-box of the present invention is not particularly limited, and is a laminated film of a base material layer and a heat adhesive resin layer, a base material layer, a gas barrier layer, and a heat adhesive property. A laminated film of a resin layer, a multilayer extruded film composed of an olefin resin, a gas barrier resin, and a polyolefin resin can be used. As the base material layer, biaxially stretched nylon (ON), biaxially stretched polypropylene (OPP), biaxially stretched polyethylene terephthalate (PET), and other biaxially stretched films and polyvinylidene chloride (PVDC) Such as ethylene-vinyl alcohol copolymer (EVOH) and polyvinylidene chloride (PVDC) as the gas barrier layer, and low density polyethylene (PE), linear low as the thermoplastic resin layer. Examples thereof include a density polyethylene (LLDPE), a medium density polyethylene (MDPE), an ethylene-α olefin copolymer (SPE) polymerized using a single site catalyst, and an ethylene-vinyl acetate copolymer (EVA).

  Examples of the configuration of the laminated film 11 include ON / adhesive / LLDPE, KON / adhesive / LLDPE, ON / adhesive / OPP / adhesive / LLDPE, KON / adhesive / OPP / adhesive / LLDPE, ON / It is a laminated film such as adhesive / EVOH / adhesive / LLDPE, or a multilayer extrusion film such as LLDPE / EVOH / LLDPE, EVA / EVOH / EVA, LDPE / EVOH / LDPE, EVA / PVDC / EVA. In the case of a multilayer extruded film, an adhesive resin layer is used between the layers as necessary. Moreover, the thing of the structure which consists of two layers of the said laminated | multilayer film and a multilayer extrusion film can also be used.

  Low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), ethylene-vinyl acetate copolymer as the piercing sealing film that covers the spout of the inner bag for bag-in-box (EVA), ionomer (IO) and ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate acid copolymer (EEA), ethylene-methacrylic acid copolymer (EMA), ethylene-methyl methacrylate acid copolymer A film made of an ethylene-acrylic acid monomer copolymer such as a coalescence (EMMA) or a multilayer film made of two or more of the above-mentioned resins can be used. By using a multilayer film, it is possible to achieve excellent piercing properties and piercing sealing properties. For example, LLDPE / MDPE / LLDPE, LLDPE / MDPE / LDPE / MDPE / LLDPE, LLDPE / EVA / LLDPE, LLDPE / IO / LLDPE, LLDPE / EAA / LLDPE, LLDPE / EEA / LLDPE, LLDPE / EMA / LLDPE, LLDPE / EMMA / LLDPE, etc. The multilayer film as described above is preferably produced by coextrusion.

  As polyethylene constituting the puncture sealing film, low density polyethylene has a density of 0.915 to 0.925, and linear low density polyethylene has a density of 0.915 to 0.925. Preferably has a density of 0.930 to 0.935. The thickness of the puncture sealing film is preferably 0.10 to 0.20 mm, and the ratio of the thickness in the case of a three-layer structure is preferably 1.0: 0.2 to 0.8: 1.0. .

  A gas barrier resin layer made of unstretched nylon (CN), polyvinylidene chloride (PVDC) -coated unstretched nylon (KCN), ethylene-vinyl alcohol copolymer, or the like is laminated on the outer surface of the puncture-sealing film. Thus, a puncture-sealing film having excellent gas barrier properties can be obtained.

The folded top view which shows embodiment of the inner bag for bag-in-boxes of this invention. II sectional drawing in FIG. Sectional drawing which shows an example of the apparatus which takes out the contents from the liquid paper container which uses the inner bag for bag in boxes of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner bag for bag in boxes 2 Peripheral heat bonding part 3 Opening 4 Spout 4a Mounting flange 5 Puncture sealing film 6,7 Thermal bonding part 8 Outer box 9 Outgoing tool 9a Puncture cylinder 10 Extraction apparatus 10a Support stand 10b Guide frame 11 Laminated film

Claims (4)

A bag formed by laminating a laminated film having a heat-adhesive resin layer on the inner surface and thermally bonding the outer peripheral edge portion, and providing an opening in one laminated film of the bag and attaching a spout to the opening An inner bag for a bag-in-box comprising a structure in which a puncture sealing film is adhered to cover the spout. The puncture sealing film is composed of low density polyethylene, linear low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid monomer copolymer, and ionomer. Item 1. An inner bag for a bag-in-box according to item 1. The piercing sealing film has an inner layer and an outer layer made of linear low density polyethylene, and an intermediate layer of low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid monomer copolymer, The inner bag for a bag-in-box according to claim 2, wherein the inner bag is a multilayer film made of any of ionomers. The inner bag for a bag-in-box according to claim 2 or 3, wherein the puncture sealing film has a configuration in which a gas barrier resin layer is laminated on the outer surface layer.

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