JP2009029454A - Bag in box spigot - Google Patents

Abstract

The present invention relates to a plug for a bag-in-box. More specifically, the present invention relates to a bag-in-box plug that prevents rattling of the adapter or cap when the adapter or cap is fitted.
An adapter or a cap is attached to an opening of a peripheral wall cylinder of a spigot attached to a plastic bag filled with liquid contents, and a fitting protrusion is provided on the outer diameter of the peripheral wall cylinder at the tip of the opening. A plug for a bag-in-box,
A bag-in-box spigot characterized in that a support ring is provided in the lower direction of the protrusion provided at the front end of the peripheral wall cylinder in the opening direction.
[Selection] Figure 1

Description

  The present invention relates to a plug for a bag-in-box. More specifically, the present invention relates to a bag-in-box plug that can prevent rattling of the adapter or cap when the adapter or cap is fitted.

  Conventionally, a bakin box is known as one of liquid packaging containers. As this back-in box, a heat-seal type plastic film bag having a pouring inlet made of a relatively large flexible film or a thin-type container of a molding type by vacuum molding or the like is used.

  The molding type liquid packaging container includes an inner container made of a thin molded container and an outer container made of cardboard or paperboard, for example. And it is frequently used mainly for liquids and mucilage used for business.

  In addition, it is lighter, stronger and stronger than glass bottles and metal cans, and is easy to carry, and after use, it is superior in recycling because corrugated cardboard, paperboard, plastic film, and thin molding materials can be collected separately.

  Furthermore, the distribution cost (because it can be folded before filling with liquid) is low, it is chemically stable, and has excellent hygiene and merchandise such as aseptic packaging. And it is widely used because of many features.

  In addition, as the contents of the bag-in-box are used, since the bag is sealed and the container (bag) is crushed by atmospheric pressure, the inflow of air into the container like a hard container is prevented. There is no need.

  Therefore, it has characteristics such as preventing the contents from being altered by the atmosphere during the period from the beginning to the end of use of the contents.

  Among the above-mentioned back-in boxes, especially those that contain beverages such as concentrated coffee, seasoning liquid, noodle soup, juices, mineral water, oolong tea, etc. It is necessary to sterilize the inner and outer surfaces of the interior bag with the configured stopper.

  In the sterilization treatment, for example, a preheating step having a steam atmosphere of about 100 ° C. is added before the heat sterilization step having a steam atmosphere of about 150 ° C., and the inner bag with a stopper is about 100 ° C. in this preheating step. Pass through the steam atmosphere.

  Then, the temperature is raised from room temperature to about 100 ° C., and then the temperature is raised from 100 ° C. to about 150 ° C. by passing through a steam atmosphere of about 150 ° C. in the heat sterilization step to perform heat sterilization.

  In addition, after fitting an adapter or cap to the cap of the interior bag with a cap, it is stored in a cardboard box, etc., and the sealed cardboard box is plugged with γ-rays, X-ray irradiation or sterilizing gas, etc. A method of sterilizing the interior bag is also performed.

When filling the contents into the cap-equipped interior bag with a filling machine, the lower fitting protrusion of the two-stage fitting protrusions provided on the adapter 100 as shown in FIG. 4 immediately before filling. What 102 is fitted to the projection 111 on the upper edge of the mouth of the plug 110 is removed in the filling machine.

  After the contents are filled, the upper fitting protrusion 101 of the two-stage fitting protrusions of the adapter 100 is completely fitted to the protrusion 111 on the upper edge of the mouthpiece 110 as shown in FIG. The adapter 100 is fully pushed in the filling machine so as to be in a combined state.

  As described above, even if the adapter 100 is conventionally pushed into the projection 111 on the upper edge of the mouth of the plug 110 and is formed in a completely fitted state, there is only one fitting place. Shaking occurs.

  For this reason, there is a concern that outside air or the like may be inserted before the filled contents are used. Further, the stored item leaks depending on the degree of rattling.

  For this reason, when the bottom of the cap of the interior bag with a cap is sealed in advance and the stored item filled in the interior bag with the cap is used, the portion where the bottom of the cap is sealed can be peeled off. A stopper is used.

  For example, the lower part of the cap of the interior bag with a cap is connected and integrated with a sealing pedestal and an inner plug in which a thin half-cut portion is applied over the entire circumference and a connecting portion extending upward from the vicinity of the thin half-cut portion. There is known an easy-opening pull-plug plug comprising a pull-ring portion. (For example, refer to Patent Document 1).

Prior art documents are shown below.
JP 2000-203617 A

  However, the easily openable pull ring-attached plug of Patent Document 1 is formed simultaneously with molding a pull ring portion for peeling off the sealed portion from the thin half-cut portion of the plug by an injection molding method.

  For this reason, there is a problem that the structure and mechanism of the mold to be molded become complicated and the manufacturing cost of the mold increases. Furthermore, there are problems that productivity is poor and manufacturing cost of the plug increases.

  The present invention has been made in view of the above-described conventional problems. The problem is that the present invention can be efficiently produced by a normal injection molding method, and a mold is also inexpensive by a conventional manufacturing process method. Thus, it is easy to manufacture, and when the produced spigot is fitted with an adapter or a cap, it forms a double fitting state and provides a bag-in-box spigot without rattling.

In order to solve the above problems, the invention according to claim 1 of the present invention provides:
For a bag-in-box having a fitting projection on the outer diameter of the peripheral wall cylinder at the tip of the opening where an adapter or a cap is attached to the opening of the peripheral wall cylinder of a spigot stuck to a plastic bag filled with liquid contents A mouthpiece,
A bag-in-box spigot characterized in that a support ring is provided on the lower side of the protrusion provided at the front end of the peripheral wall cylinder in the opening direction.

Next, the invention according to claim 2 of the present invention is as follows.
The bag-in-box plug according to claim 1, wherein the bag-in-box plug is formed by injection molding.

  The bag-in-box spigot of the present invention has the above-described configuration, so that the adapter or cap can be prevented from rattling when fitted with the adapter or cap.

  Moreover, the metal mold | die for manufacturing this plug is a conventional metal mold structure, and it can manufacture easily cheaply with a processing method. And it can manufacture with a production efficiency similarly to the past by a well-known injection molding method.

  Further, since the plug is fitted with the adapter or the cap in a double state, the stored item does not ooze out or leak as well as the above-described rattling.

  The bag stopper for a bag-in-box according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a state where a back-in-box mouth plug, its stopper, and a plastic bag are attached as an embodiment of the present invention, and (a) is a schematic sectional view thereof, (b ) Is a schematic plan view of the plug.

  The bag-in-box plug is attached to a plastic bag housed inside a box made of cardboard or the like as shown in FIG.

  The structure of the back-in-box spigot 10 of the present invention includes a flange portion 12 having an area that can be bonded to the inner surface of the plastic bag 20 by the seal portion 21, and a liquid used when pouring the stored item from the center portion of the flange portion 12. It is formed from the cylinder part surrounding wall 11 which forms a conduit | pipe part.

  The distal end portion of the cylindrical portion peripheral wall 12 is an opening portion 13 for pouring and injecting liquid, and on the outer side of the cylindrical portion peripheral portion 12 between the flange portion 12 and the opening portion 4, an upper end rib 14 and its A guide plate 16 made of a rib is provided below the support rib 15.

  And as above-mentioned, the inner surface of the plastic bag 20 is stuck on the upper surface side of the flange part 12 of the spigot 10 via the seal part 21, and the spigot 10 protruding from the bag 20 is provided. It is made up of.

  Further, the bag-in-box stopper 10 is formed with a cross-shaped rib 23 on the inner side below the cylindrical peripheral wall 12 to prevent the plastic bag film 22 from entering the stopper 10.

  Further, a radial groove 24 is formed on the lower surface side of the flange portion 12 of the plug 10 in order to secure a liquid flow path when filling and discharging the stored items.

Further, the bag plug 10 for the bag-in-box according to the present embodiment is manufactured by an injection molding method. And if the resin of the stopper 10 used by the injection molding method is a thermoplastic resin, it will not be restrict | limited. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, Polyethylene resins such as ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene, acrylic acid, methacrylic acid, maleic acid, anhydrous Known resins such as acid-modified polyolefin resins modified with unsaturated carboxylic acids such as maleic acid, fumaric acid, and itaconic acid, polyvinyl acetate resins, poly (meth) acrylic resins, and polyvinyl resins are used.

  Further, when the plug 10 is molded using the above resin, as general additives, for example, ultraviolet absorbers, antistatic agents, flame retardants, fireproofing agents, fungicides, pigments, fillers, etc. Etc. can be used. The addition amount can be arbitrarily added from a very small amount to several tens of percent depending on the purpose. Then, the plug 10 is molded using a known injection molding machine or the like.

  The bag-in-box plug 10 of the present invention is obtained by injection molding. As a manufacturing method thereof, for example, a thermoplastic resin is placed in a cavity of a closed mold using a half mold having a split surface along the axial direction of the plug 10 (the rotation axis direction of the rotating plug). The plug 10 is injected and molded. And after injection molding, the method of taking out the shaping | molding stopper 10 etc. by opening the half mold and ejecting to an axial direction (direction of an opening | mouth part) is used.

  The plastic bag 20 may be a single film or a laminated film that imparts gas barrier properties, scratch resistance, pinhole properties, and the like. Further, when the amount of the stored items is large, such as 5L, 10L, and 20L, in order to prevent leakage of the stored items due to the damage of the bag 20, the films are appropriately overlapped to form a double or triple film. And the method of setting it as the bag 20 of a multiple bag type is used.

  In addition, when a laminated film is used for the bag 20, the innermost surface layer of the laminated film, that is, the sealant layer that becomes the wetted surface is excellent in heat seal strength, low-temperature heat sealability, pinhole resistance, etc. Further, ethylene-vinyl acetate copolymer, linear low density polyethylene or the like is used.

  The sealant layer has a considerable influence on the scent and taste of the stored item depending on the stored item. For this reason, among the polyolefin-based resins, a resin having a narrow molecular weight distribution, a stable copolymerization ratio, and excellent low-temperature heat sealability, hot sealability, and the like is appropriately selected depending on the contents to be stored.

  And the bag 20 excellent in filling suitability is manufactured with high productivity, without impairing the fragrance and taste of the stored item, and without the inner surfaces of the bag 20 being in close contact with each other.

  Moreover, the lamination of each layer of the laminated film used for the bag 20 is a dry lamination method in which bonding is performed using an adhesive such as a two-component curable urethane resin, and non-solvent lamination in which bonding is performed using a solventless adhesive. A known lamination method can be used such as a lamination method by a method, an extrusion lamination method in which a resin is heated and melted and then extruded and pasted into a curtain shape.

  In particular, it is preferable to apply a dry lamination method in which the layers of the laminated film used in the bag 20 are laminated using a dry lamination adhesive.

  As the dry lamination adhesive, it is possible to use a two-component curing type vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type adhesive or the like. However, a two-component curable urethane adhesive is preferably used.

  Examples of the adhesive coating method include direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, Fonten method, and transfer roller. -It can apply | coat by methods, such as a coat method and others.

  Further, the form of the bag 20 is not particularly limited. For example, in addition to a flat pouch such as a conventionally known three-side seal type, four-side seal type, pillow type, etc., any form such as a gusset pouch, or a modified type thereof. Can also be taken.

  Therefore, a conventionally known bag making machine can be used for bag making of the bag 20 in accordance with its form. Then, the plug 10 can be attached in-line with the bag making by incorporating an attachment device or the like of the plug 10 if necessary.

  Further, the attachment of the inner surface of the film 22 of the bag 20 and the upper surface of the flange portion 12 of the spigot 10 is performed by any method such as heat welding, for example, a heat sealing method, an impulse sealing method, or an ultrasonic heat welding method. Is done.

  Next, FIG. 2 is a partial cross-sectional view showing a partial cross-section of an embodiment in which an adapter is fitted to the back-in-box mouth plug of the present invention.

  After the inner surface of the film of the bag 20 and the upper surface of the flange portion 12 of the spigot 10 are adhered, foreign matter such as dust or dust does not enter the inner surface of the film 22 of the bag 20 from the spigot 10 until the stored item is filled and stored. Thus, an adapter or the like is fitted to the plug 10.

  As shown in FIG. 2, the fitting is performed in the storage box until just before filling the storage item with the lower protrusion 32 of the adapter 30 fitted into the upper rib 14 of the plug 10. Stored and distributed.

  Further, when filling the bag 20 to which the plug 10 is attached, the adapter 30 fitted to the upper rib 14 of the plug 10 shown in FIG. 2 is removed immediately before filling. Then, as described above, the inner surface of the bag 20 and the like are subjected to heat sterilization, and then the stored item is filled from the opening 10 of the plug 10.

  Further, after the storage item is filled, as shown in FIG. 3, the upper fitting projection 31 of the adapter 30 has two upper fitting projections 31 and the upper fitting projection 32 of the plug and the lower fitting projection 32. It is pushed into the filling machine one by one so that the support rib 15 below the upper rib 14 is completely fitted. And since adapter 30 will be in a double fitting state, shakiness of adapter 30 is prevented.

As one embodiment of the present invention, a back-in-box plug, its plug and a plastic bag are attached, (a) is a schematic cross-sectional view, (b) It is a schematic plan view of a spout. It is a fragmentary sectional view which shows the partial cross section of one Example by which the adapter was fitted by the stopper for back in boxes of this invention. It is a fragmentary sectional view which shows the partial cross section of other one Example by which the adapter was fitted by the stopper for back in boxes of this invention. It is a fragmentary sectional view which shows the partial cross section with which the adapter was fitted by the conventional stopper for back in boxes. It is a fragmentary sectional view which shows the other partial cross section by which the adapter was fitted by the conventional stopper for back in boxes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Plug 11 ... Cylindrical peripheral wall 12 ... Flange part anisotropic diffusion plate 13 ... Opening part 14 ... Upper rib 15 ... Support rib 16 ... Guide plate 20 ... Back 21 ... Seal part 22 ... Film 23 ... Cross-shaped rib 24 ... Radial groove 30 ... Adapter 31 ... Upper fitting protrusion 32 ... Lower fitting protrusion

Claims (2)

For a bag-in-box having a fitting projection on the outer diameter of the peripheral wall cylinder at the tip of the opening, where an adapter or a cap is attached to the opening of the peripheral wall cylinder of a plug stuck to a plastic bag filled with liquid contents A mouthpiece,
A bag-in-box spigot characterized in that a support ring is provided in the lower direction of the protrusion provided at the front end of the peripheral wall cylinder in the opening direction.   The box plug for a bag in box according to claim 1, wherein the bag plug for the bag in box is formed by injection molding.

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