JP2959981B2 - Package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package. More specifically, the present invention relates to a package particularly effective for packaging various foods and beverages, or as a bag in a bag-in-box.

[0002]

2. Description of the Related Art Polyolefin-based resins and polyester-based resins have been used as materials for various types of packaging, particularly food and beverage wrapping bags or bag-in-box inner bags.
For example, a laminated resin layer in which a saturated polyester resin layer and a biaxially stretched saturated polyester resin film layer are adhered via an adhesive layer is laminated on a packaging material base material, and the laminated resin layer becomes an inner peripheral surface layer. Such containers and packaging bags (JP-A-64-186)
No. 34), a non-adsorptive packaging material having at least an inner layer of a polymer alloy of a polyester resin and an arylate resin (JP-A-3-96344), and a polymer in which a heat seal layer is mainly composed of a copolymerized polyester. Multilayer packaging material composed of a composition (Japanese Unexamined Patent Publication No.
No. 2837).

[0003]

However, the container and the packaging bag disclosed in the above publication are, as an improvement, to improve the rigidity of the innermost linear saturated polyester resin layer without causing any unpleasant taste or odor in the filling. Although the nature of being brittle is compensated by the biaxially stretched saturated polyester layer, the structure is inevitably complicated and expensive,
Since the inner layer is a polyester resin, the heat sealing property is not always satisfactory. Also, the packaging material disclosed in and, although improvement in non-adsorption property and fragrance retention is recognized, both must be expensive because of using a special polymer alloy or polymer composition However, since the melt viscosity is low and a sufficient sealant thickness cannot be obtained at the time of heat sealing, it cannot be said that the seal strength is always sufficient. The present invention has been made in view of the above-described problems, and has non-adsorbing properties.
It is an object of the present invention to provide a package having excellent scent retention and also excellent heat sealing at the time of heat sealing.

[0004]

According to the present invention, in order to achieve the above object, according to the present invention, a heat-sealing polymer film (surface film (I)) is provided with a narrower heat-resistant polymer film. Two sets of laminated films (I) in which polymer films (inner films (I)) having excellent adhesiveness, non-adsorptivity and fragrance retention properties are laminated so that both ends of the surface film (I) protrude, (I) are superposed so that they face each other, and the inner film (I) and the inner film (I) having the same physical properties as the inner film (I) and the inner film (I), respectively.
Two sets of the laminated film (II) having the same width as the laminated film (I) on which the laminated film (I) is laminated are coated from the outside at both ends in the longitudinal direction of the laminated film (I) such that the inner film (II) is inside. A package is provided in which the four ends of the two sets of laminated films (I) are heat-sealed together with the two sets of laminated films (II).

In a preferred embodiment, the surface film (I) and the inner film (II) are linear-low-density polyethylene (L-LDPE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), A package is provided, which is a polymer film selected from the group consisting of ethylene vinyl acetate (EVA), unstretched polypropylene (CPP), and a copolymer or modified product thereof.

The inner film (I) and the surface film (II) are made of polyethylene terephthalate (PE).
T), polycarbonate (PC), metal, and SiO
_{and x} is a film or a coat layer selected from the group consisting of _x .

Further, there is provided a package according to the above description, wherein a through hole is provided in a part of the laminated film (I), and an injection cap is attached to the through hole.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings based on embodiments. FIG. 1 is an explanatory view showing a process of forming a package of the present invention, wherein (a) shows a surface film (I).
FIG. 2 is a front view showing a laminated film (I) including an inner film (I), (b) is a plan view thereof, and (c) further shows a laminated film (II) in a longitudinal direction of the laminated film (I). It is a perspective view which shows the state before the heat sealing wrapped at both ends. FIGS. 2A and 2B are cross-sectional views of the package before heat sealing shown in FIG. 1B taken along line AA and line BB, respectively, wherein FIG. 2A is a line AA, and FIG. It is each sectional drawing of the B line. FIG. 3 is a cross-sectional view showing a state after heat sealing is performed from the state shown in FIG.
-A line, (b) shows each sectional view of the BB line.
4A and 4B are explanatory views showing a state in which an injection cap is attached to the package of the present invention, wherein FIG. 4A is a perspective view, and FIG.
It is a C line sectional view.

As shown in FIGS. 1 (a) and 1 (b), in the package of the present invention, a polymer film (surface film (I)) 1 having a strong adhesive property at the time of heat sealing has a width larger than that. First, a laminated film (I) is formed by laminating a narrow polymer film (inner film (I)) 2 excellent in anti-adsorption property and fragrance retention property so that both ends of the surface film (I) 1 protrude. The surface film (I) and the inner film (I) may be simply overlapped or may be bonded to each other via an adhesive layer therebetween.

The surface film (I) used here is not particularly limited as long as it is a polymer film having a heat-sealing property at the time of heat sealing. For example, linear-low-density polyethylene (L-LDPE), high-density polyethylene (HDP
E), low density polyethylene (LDPE), ethylene vinyl acetate (EVA), unstretched polypropylene (CP
P)) Films or coat layers.

The inner film (I) is not particularly limited as long as it is a film having excellent heat resistance, non-adsorptivity, and fragrance retention properties. For example, polyethylene terephthalate (PET), polycarbonate (PC), metal , S
An iO _x film or coat layer can be mentioned.

The width of both protruding ends of the surface film (I) 1 is not particularly limited as long as it does not hinder normal side sealing.

Next, as shown in FIG. 1 (C), the two sets of laminated films (I) 3 are
Are laminated so as to face each other, and two sets of the laminated film (II) 4 are coated such that the inner film (II) is on the inner side and the longitudinal ends of the laminated film (I) 3 are covered from the outer side. Wrap around.

The laminated film (II) has an inner film (II) and a surface film (II) having the same physical properties as the surface film (I) and the inner film (I), respectively.
Are laminated. This lamination may be performed simply by lamination, or may be adhered to the middle with an adhesive. Also,
Usually, the width of the laminated film (II) 4 is almost the same as the width of the laminated film (I) 3.

The surface film (II) and the inner film (II) are not particularly limited as long as they have the same physical properties as the inner film (I) and the surface film (I), respectively. May include the polymer films described above. The surface film (I) 1
And inner film (II) 6, and inner film (I) 2
The surface film (II) 5 and the surface film (II) 5 only need to have the same physical properties, and it is not always necessary to use the same material.

Next, as shown in FIGS. 2A and 2B, the four ends of the two sets of laminated films (I) 3 are heat-sealed together with the two sets of laminated films (II) 4.

Here, the sealer 7 used for the heat seal is not particularly limited, and examples thereof include a general heat seal, an ultrasonic seal, an impulse seal, and a high frequency seal.

As shown in FIG. 2 (a), both end portions in the longitudinal direction are sealed by a sealer 7 so that two surface films (I) 1 of a laminated film (I) 3 and inner surfaces of a laminated film (II) 4 are formed. As shown in FIG. 1 (b), the two surface films (I) 1 of the laminated film (I) 3 are tightly heat-sealed with the film (II) 6 at both ends in the width direction. Thus, the package 10 can be obtained.

On the other hand, between the inner films (I) 2
Since it is a material with excellent heat resistance, it is not heat sealed. Therefore, in the package 10 of the present invention, the inner layer surface which is in direct contact with the contents is constituted by the inner film (I) 2 having non-adsorptive and scent-retaining properties, and can prevent adsorption of minerals and odor components. At the same time, the scent of the contents can be retained.

The loading of the contents of the package 10 of the present invention is not particularly limited. For example, as shown in FIG.
One example is to provide a through hole 9 in one laminated film (I) 3 and attach an injection cap 8 having an injection port there. The fixing between the injection cap 8 and the penetration section 9 can be performed by using an adhesive such as hot melt, screwing, or heat sealing the injection cap using the same material as the surface film (I) 1. Further, the injection cap 8 may be attached so as to penetrate the laminated film (I) 3 without providing the through hole 9. When the injection cap 8 is not used, for example, it is possible to leave the portion of one of the laminated films (II) 4 without heat sealing, and to heat seal the portion after filling the contents.

In another embodiment of the present invention, when gas barrier properties are required due to the contents, an inner film (I) having a metal or SiO _x layered on the inner surface can be used. Surface film (I)
Between two surface films (I), metal, Si
O _x, EVOH, PVOH, or may be interposed a film or coating layer made of PVDC.

Further, a metal, SiO _x , EVOH, PVO is provided between the inner film (I) and the surface film (I).
A film or coat layer made of H or PVDC may be interposed.

The surface film (I) itself may be a multilayer. For example, HD as the surface film (I)
An inner film (I), for example, PET may be superposed on the L-LDPE side using a two-layer structure composed of PE and L-LDPE. By doing so, a difference in melting point occurs between the inner surface and the surface at the protruding portion of the laminated film, so that heat sealing of the protruding portion can be easily performed. Similarly, for the inner film (I), various PET, PC, metal,
May be used in which the SiO _x or the like and the multilayer.

Further, if necessary, as a packaging base material,
Paper and leather may be appropriately laminated.

[0025]

As described above, according to the present invention, it is possible to provide a package which is excellent in non-adsorptivity and fragrance retention, and is also excellent in heat sealability at the time of heat sealing. Further, by attaching an injection cap having an injection port, the contents can be smoothly filled, and the contents can be used repeatedly after use.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a process of forming a package of the present invention, wherein (a) is a front view showing a laminated film (I) of a surface film (I) and an inner film (I),
(B) is a plan view, and (c) is a perspective view showing a state before heat sealing in which the laminated film (II) is further wrapped around both ends in the longitudinal direction of the laminated film (I).

FIG. 2 shows the package before heat sealing shown in FIG.
FIG. 4 shows cross-sectional views taken along lines AA and BB,
(A) is a sectional view of the AA line, and (b) is a sectional view of the BB line.

3A and 3B are cross-sectional views showing a state after heat sealing is performed from the state shown in FIG. 2, wherein FIG. 3A is a cross-sectional view taken along line AA, and FIG. 3B is a cross-sectional view taken along line BB.

4A and 4B are explanatory views showing a state in which an injection cap is attached to the package of the present invention, wherein FIG. 4A is a perspective view, and FIG.
It is a C line sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface film (I) 2 Inner film (I) 3 Laminated film (I) 4 Laminated film (II) 5 Surface film (II) 6 Inner film (II) 7 Sealer 8 Injection cap 9 Through-hole 10 Package

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI B32B 27/36 B32B 27/36 102 102 B65D 77/30 B65D 77/30 A (58) Investigation fields (Int.Cl. ⁶ , (DB name) B65D 65/40 B32B 15/08 B32B 27/00 B32B 27/28 101 B32B 27/32 B32B 27/36 B32B 27/36 102 B65D 77/30

Claims (4)

(57) [Claims] 1. A polymer film (inner film) having a narrower width and excellent in heat resistance, non-adsorptivity and fragrance retention on a polymer film (surface film (I)) having strong adhesiveness at the time of heat sealing. (I)) the surface film (I)
The two sets of the laminated film (I) laminated so that both ends protrude are overlapped so that the respective inner films (I) face each other, and the same as the surface film (I) and the inner film (I), respectively. Two sets of laminated film (II) having the same width as laminated film (I) obtained by laminating inner film (II) and surface film (II) having physical properties
The two ends of the laminated film (I) are wrapped so as to cover the two ends in the longitudinal direction of the laminated film (I) from the outside so that the inner side of the laminated film (I) is formed, and the four ends of the two laminated films (I) are two sets of the laminated films (I
A package characterized by being heat-sealed together with I). 2. The method according to claim 1, wherein the surface film (I) and the inner film (II) are linear-low-density polyethylene (L-LDP).
E), high density polyethylene (HDPE), low density polyethylene (LDPE), ethylene vinyl acetate (EV
The package according to claim 1, wherein the package is a polymer film or a coat layer selected from the group consisting of A), unstretched polypropylene (CPP), and a copolymer or modified product thereof. 3. The method according to claim 1, wherein the inner film (I) and the surface film (II) are made of polyethylene terephthalate (PE).
T), polycarbonate (PC), metal, and SiO
3. The package according to claim 1, wherein the package is a film or a coat layer selected from the group consisting of _x . 4. The laminated film (I) according to claim 1, wherein a through hole is provided in a part of the laminated film (I), and an injection cap is attached to the through hole. Packaging.