JP2007106478A - Spout of bag-in-box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spout of a bag-in-box, which is free from external contamination, keeps aseptic for an aseptically filling object in particular, and easily pours out the object by a simple unsealing operation. <P>SOLUTION: The bag-in-box comprises: flexible plastic films 11A and 11B overlapped and heat-sealed around their peripheries; and a ferrule-shaped spout 101 and a filling inlet mounted on the films 11A and 11B. An easily peelable film 21 is heat-sealed with a flange 33 on the side of the contents of the spout 101. The shape of the heat-sealed part 43A has a protrusion for starting to unseal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spout of a back-in box that ejects a spout into the outer surface of an outer box formed of corrugated cardboard or the like as necessary, and pours out the contents in the inner bag. The present invention relates to a spout of a back-in box that can be easily poured by opening an easy peel film inside.

In this specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified, “/” mark is laminated integrally, and “//” mark is not bonded. Indicates that it is double-layered.
“BIB” is “back-in-box”, “PET” is “biaxially stretched polyethylene terephthalate film”, “ON” is “biaxially stretched polyamide film”, “LDPE” is “low density polyethylene”, “L- “LDPE” is an abbreviation, functional expression, common name, or industry term for “linear low density polyethylene” and “EVA” for “ethylene-vinyl acetate copolymer”.

  (Main applications) The main applications of the BIB having the back-in-box spout of the present invention include liquid foods such as milk, cream, juice, liquor, soft drinks, liquid foods containing solids, or liquid chemicals. It is a container for storing and distributing such as aseptic filling in particular. However, the application is not particularly limited as long as the application requires simple dispensing.

(Background Art) Conventionally, since BIB performs filling and pouring from one spout, after filling, the cap is sealed with a heat-shrinkable film on the cap to prevent liquid leakage and contamination during transportation. However, it is practically difficult to seal after filling.
In order to solve this problem, a removable sealing member for closing the spout of the cap is provided, but the opening operation is complicated.
Therefore, the spout of the back-in box is not contaminated, and a spout that can be easily poured out by a simple opening operation while maintaining aseptic conditions with an aseptic filling is demanded.

(Prior art) Conventionally, a spout having a ring-shaped fitting portion provided on the outer periphery of a tubular spout, and a cap having a cylindrical portion having a diameter that can be fitted to the spout, is flexible at the upper end of the cap. The concave portions having the properties are connected with a sufficient spacing to allow the tip of the spout to be sufficiently crimped, an opening / closing knob is provided at the center of the concave portion, and one rectangular spout near the upper end of the cylindrical portion (See, for example, Patent Document 1). However, by using the thumb and index finger to push the opening / closing knob in the direction opposite to the spout, the opening / closing auxiliary part connected to the opening / closing knob is lifted and simultaneously deflects the concave part near the spout. And the concave portion is released, and the content liquid is poured out, so that there is a problem that the opening operation is complicated.
The present applicant also includes a spout having a ring-shaped convex portion on the outer periphery of the tubular spout and a cap having a cylindrical portion that can be fitted to the spout, and is a removable sealing member that closes the spout of the cap. And a single spout is provided near the upper end of the cylindrical portion of the cap. When the spout is fitted into the spout, the spout of the bag-in-box is closed from the inside by the upper end of the spout. A dispensing device is known (see, for example, Patent Document 2).
However, there is a problem that the spout is complicated and the opening operation is complicated.

Japanese Utility Model Publication No. 52-44136 JP 2002-53172 A

  Accordingly, the present invention has been made to solve such problems. The object is to provide a spout for a back-in box that is not contaminated from the outside and that can be easily poured out by a simple opening operation while maintaining aseptic conditions, particularly in aseptic filling.

In order to solve the above-mentioned problem, the spout of the back-in box according to the invention of claim 1 has at least two flexible plastic films stacked and heat-sealed at the periphery, and the flexible plastic film has a ferrule shape. In the back-in box to which the spout and the filling inlet are attached, an easy peel film is heat-sealed on the flange on the contents side of the ferrule-shaped spout.
The spout of the back-in-box according to the invention of claim 2 has a protrusion that causes the opening of the heat seal portion between the flange on the contents side of the ferrule-shaped spout and the easy peel film. As you can see.
The spout of the back-in-box according to the invention of claim 3 has a cap having a shape in which the ferrule-shaped spout has a ring-shaped convex portion on the opposite side to the contents side, and is fitted to the ring-shaped convex portion, or A detachable sealing member constituted by an overcap having a shape covering the ring-shaped convex portion is provided.

According to the first aspect of the present invention, there is provided a spout of a back-in box that can be easily poured out by a simple opening operation.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a back-in-box spout can be provided that can be poured out more easily by a simple opening operation.
According to the third aspect of the present invention, in addition to the effects of the first and second aspects, a back-in box that is not contaminated from the outside during pouring, and can be poured out while maintaining aseptic conditions, particularly in aseptic filling. A spout is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a spout of a back-in box showing one embodiment of the present invention.
FIG. 2 is a plan view of the back-in-box inner bag.
FIG. 3 is a cross-sectional view of the back-in-box inner bag.
FIG. 4 is a plan view for explaining the heat seal shape between the flange on the contents side of the spout and the easy peel film.
FIG. 5 is a cross-sectional view of a main part for explaining a method of pouring from the spout.

  (Invention of Product) A back-in box (referred to as BIB) is generally composed of a BIB inner bag having at least one outlet, and an outer box for holding the inner bag, as shown in FIG. As shown in FIG. 2, the BIB inner bag 11 used in the present invention overlaps at least two flexible plastic films 11A and 11B, and the peripheral edge is heat-sealed by the heat seal portion 13, so that the flexible plastic film 11A or A ferrule-shaped spout 101 and a filling inlet 103 are attached to 11B. The spout 101 of the back-in-box of the present invention is a ferrule-shaped spout 31 in which the easy peelable film 21 is heat-sealed to the flange 33 on the contents side. The shape of the heat seal portion 43 </ b> A preferably has a protruding portion 45 that triggers opening. Furthermore, the spout 101 is a ferrule-shaped spout 31, and has a ring-shaped convex part on the opposite side to the contents side, and a cap shaped to fit into the ring-shaped convex part, or an overcap shaped to cover the ring-shaped convex part It is preferable to provide a removable sealing member constituted by

  (Outer Box) The outer box used for the BIB of the present invention is not particularly limited, and may be a known one such as A-type, B-type, or AB-type cardboard, paperboard, and wooden box.

  (Flexible film) The flexible plastic film comprises a flexible plastic film 11A and a flexible plastic film 11B. As shown in FIG. 2, the two flexible plastic films 11A and 11B are overlapped to form a peripheral edge. What is necessary is just to heat-seal in the heat seal part 13. FIG. The material of the flexible plastic films 11A and 11B may be the same or different, and may be composed of a single layer or a plurality of layers. Further, a plurality of sheets may be used. For example, if a total of four sheets of flexible plastic films 11A and 11B are overlapped and heat-sealed in four directions to provide a heat seal portion 13, a double bag is obtained. . Moreover, if a total of 6 sheets of 3 sheets are overlapped and the four sides are heat-sealed to provide the heat-sealing portion 13, a triple bag is obtained. Further, different numbers such as two sheets of flexible plastic film 11A and one sheet of flexible plastic film 11B may be used.

  The flexible plastic films 11A and 11B are not particularly limited as long as they have flexibility. For example, in the case of a single layer, LDPE, L-LDPE, EVA, ionomer resin, ethylene-acrylic acid copolymer (EAA) ), Ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-propylene copolymer (EP), polyethylene Alternatively, an acid-modified polyolefin resin obtained by modifying a polyolefin resin such as polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, or itaconic acid, a polyvinyl acetate resin, or the like can be applied. These resins can be used singly or in combination, and additives may be added as necessary. In multiple layers, ON / LDPE, ON / L-LDPE, ON / EVA, ON / LDPE / Al / LDPE, etc. can be applied. An Al foil or a vapor-deposited Al thin film may be laminated as long as flexibility is not hindered, and the storage stability of the contents can be improved, which is preferable.

  (Injection port) A ferrule-shaped spout 101 and an injection port 103 for filling are formed in any one of the flexible plastic films 11A or 11B of the BIB inner bag 11 formed by stacking the flexible plastic films 11A and 11B. Provide. The filling inlet 103 may be provided in another flexible plastic film. The injection port 103 may be a known one, for example, an LDPE injection molded product.

  As shown in FIG. 3, the spout 101 is a ferrule-shaped spout 31, which includes a flange 33 and a ring-shaped protrusion 35, and a ring-shaped recess 37 on the opposite side to the contents of the ring-shaped protrusion 35. The side opposite to the contents of the flange 33 is heat sealed by the flexible plastic film 11A or 11B and the heat seal part 43B, and the contents side of the flange 33 is provided by the easy peel film 21 and the heat seal part 43A. It is heat sealed.

  (Easy peelable film) The easy peelable film 21 can be heat-sealed at the heat seal portion 43A with the contents side of the flange 31 of the spout 101 and utilizes the interfacial peelability between the seal layers when opened. It has an easy peel function that can be easily opened by a method utilizing the cohesive fracture peelability of the material of the seal layer, a method of providing a thin layer as much as possible, a method of providing a half cut, etc. What is necessary is just to select suitably by the combination of these.

  When an injection molded product of LDPE is used as the spout 101, it is a PET / easy peel layer, an ON / easy peel layer, an ON / LDPE / easy peel layer, etc. A polymer, a graft polymerization to a polymer, a modified product, or a blended resin obtained by blending other resins can be applied. As an easy peel layer, if a specific example is given, for example, when polyethylene consisting of polyethylene, an ethylene-vinyl acetate copolymer, etc. as a main ingredient is used as the material of the spout, the easy peel film 21 may be polypropylene. A material mainly composed of polypropylene made of a blend polymer of polyethylene and polypropylene or a copolymer of ethylene-propylene can be applied.

  (Sterilization) In FIG. 3, the BIB inner bag 11 is in a state in which air is contained in the bag, but in actuality, the upper and lower films are in close contact with each other during bag making. There is very little air in the bag. When performing aseptic filling, the BIB inner bag 11 is sealed and sterilized by a known method with ethylene oxide gas, γ rays, electron beams, etc., so that the bag interior is completely sterilized. Aseptic filling may be performed from the injection port 103.

(Opening) As shown in FIG. 4, opening is performed by inserting a rod-shaped opening jig 105 into the ferrule portion of the BIB spout 101 and pressing the easy peel film 21 heat-sealed to the flange 31. It can be easily peeled and opened.
At this time, the shape of the heat seal portion 43A between the flange 33 on the contents side of the ferrule-shaped spout 101 and the easy peelable film 21 may be provided with a protrusion that triggers opening as shown in FIG. preferable. By providing the protrusion, even a weak pushing force of the rod causes a crack such as peeling and can be poured out more easily by a simple opening operation.

  In the case of aseptically filled contents, a pour hose is connected to the annular recess 37 of the pour port 101 via an O-ring and sealed, and known contents such as sterilized air, steam, or a bactericidal agent are sealed. After the sterilization by the method, the unsealing operation is performed, so that it is not contaminated from the outside at the time of pouring and can be poured while maintaining the aseptic condition.

  (Sealing member) Further, the cap 103 is configured to fit into the ring-shaped convex portion 33 on the side opposite to the contents side of the inlet 103 and / or the spout 101, or an overcap shaped to cover the ring-shaped convex portion. It is more preferable to provide a removable sealing member formed from the viewpoint of preventing contamination of the inlet 103 and / or the spout 101.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this.

(Example 1) First, ON 25 μm / LMD / LDPE 40 μm and EVA 60 μm were used as flexible plastic films 11A and 11B, and the EVA surface of the two-sheet set was opposed to a size of 460 mm × 490 mm by a known method. , With a seal width of 12 mm, sealed in four directions, ON 25 μm / LMD / LDPE 40 μm // EVA 60 μm / (part containing contents) / EVA 60 μm // LDPE 40 μm / LMD / ON 25 μm BIB inner bag (for volume 10 l) Was made. When making a bag, the films were in close contact so that air could not enter the bag as much as possible. Note that LMD is a laminate by a dry lamination method.
At the same time, in the film on one side of the bag, as shown in FIG. 2, a hole having a diameter of 42 mm is formed at the center of the vertical direction (460 mm) and 60 mm from the right end in the horizontal direction (490 mm). A hole with a diameter of 42 mm was formed in the flange of the injection port 103 at a position 60 mm from the left end in the horizontal direction (490 mm) at the center in the vertical direction (460 mm), and the flange 33 of the injection port 101 was heat-sealed at that portion.
The injection port 103 was made of polyethylene by injection molding with an inner diameter of 30 mm, a wall thickness of 3 mm, a height of 30 mm, an outer diameter of the flange of 65 mm, and a 3 mm thick polyethylene injection molding cap.
The spout 101 is provided with a ring-shaped convex portion 33 having an inner diameter of 30 mm, a wall thickness of 3 mm, a height of 30 mm, and an outer diameter of 50 mm by polyethylene injection molding, and the ring-shaped convex portion 35 is provided with a ring-shaped concave portion 37 having a width of 5 mm and a diameter of 40 mm. The outer diameter of the flange is 65 mm, and an easy peelable film 21 consisting of 40 μm of ON25 μm / LMD / easy peel layer (a blend of LDPE and PP) is projected on the flange contents side as shown in FIG. Heat sealing was performed with a heat seal shape provided with a portion 45, and a cap having a cylindrical portion was fitted.
The BIB inner bag 11 was irradiated with γ rays so that the absorbed dose on the inner surface of the bag became 15 KGy (kilo gray) by a known method, and the inner and outer surfaces of the bag were sterilized. Using a known aseptic filling machine (not shown), the sterilized BIB inner bag 11 was aseptically filled with commercial soup from the inlet 103 and sealed.
The pouring port 101 of the filled BIB inner bag is sterilized by removing the fitting cap with a positive pressure aseptic air chamber and spraying a bactericidal agent, tightly connected to the opening of the opening device, and a rod provided at the opening 4 is inserted into the ferrule portion of the BIB spout 101 and the easy peelable film 21 heat-sealed to the flange 33 is pushed as shown in FIG. It was easy to open.

  (Example 2) As flexible plastic films 11A and 11B, using ON 25 μm / LDPE 15 μm / Al foil 7 μm / LDPE 40 μm and EVA 60 μm, as in Example 1, except that hot filling orange juice instead of aseptic filling, BIB was obtained. The filling opening 101 of the filled BIB bag is tightly connected to the opening of the opening device, and a rod-shaped opening jig 105 provided at the opening is connected to the opening of the BIB outlet 101 as shown in FIG. When the easy peelable film 21 inserted into the ferrule part and heat-sealed to the flange 33 was pressed, the film peeled easily and opened very easily.

It is a perspective view of the spout of the back-in box which shows one Example of this invention. It is a top view of a back-in-box inner bag. It is sectional drawing of a back-in-box inner bag. It is a top view explaining the heat seal shape of the flange by the side of the contents of a spout, and an easy peel property film. It is sectional drawing of the principal part explaining the pouring method from a spout.

Explanation of symbols

10: BIB
11: BIB inner bag 11A, 11B: Flexible plastic film 13, 43A, 43B: Heat seal part 101: Outlet 103: Inlet 21: Easy peel property film 31: Spout 33: Flange 45: Protrusion part

Claims (3)

A ferrule-shaped spout in a back-in box in which at least two flexible plastic films are overlapped and a peripheral edge is heat-sealed, and a ferrule-shaped spout and a filling inlet are attached to the flexible plastic film An easy-peel film is heat-sealed on the flange on the content side of the back-in-box spout. 2. The back-in-box according to claim 1, wherein the shape of the heat seal portion between the flange on the contents side of the ferrule-shaped spout and the easy peel film has a protrusion that triggers opening. Spout. The ferrule-shaped spout has a ring-shaped convex part on the opposite side to the contents side, and is a detachable structure constituted by a cap shaped to fit into the ring-shaped convex part or an overcap shaped to cover the ring-shaped convex part 3. The back-in-box spout according to claim 1, further comprising a possible sealing member.

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