JPH08324594A - Plastic container with fastener - Google Patents

Abstract

PURPOSE: To obtain a plastic container whose ratio of capacity/packing material area is large, having easy unsealability good stability during transportation and storage, an ability to keep the sealed part hard to be broken even when there is internal pressure, and sealability even after unsealing. CONSTITUTION: Relating to a plastic container having a plastic fastener 15 at the portance, one fastening element is provided on the inner surface 11-b of the container and the other fastening element to engage therewith, on a sealing sheet or the like 12. In addition, on the side of the contents and further from the fastener the sealing sheet or the like is, in a manner of joining, put against an easily separable joining part 13 provided on the inner surface of the container, where one fastening element is provided, and in parallel with the fastener.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Packaging material with plastic zipper that can be used for general packaging materials such as food and drink, pharmaceuticals, stationery, machine parts, electronic parts, etc., cheap, lightweight, easy to open and resealable The present invention relates to a packaging plastic container having a large internal volume.

[0002]

2. Description of the Related Art A conventional container with a plastic zipper,
When filling the contents of a plastic bag with a chuck with an automatic filling machine, the inlet side of the plastic chuck is first heated with the bottom part left open in order to complete the sealing of the package and protect the chuck part. Seal and
After filling the contents from the bottom, the bottom is further heat-sealed. To open the heat seal on the inlet side with scissors or make a notch, make a perforation, or install a tearing tape so that the chuck can be used when opening. In addition to heat sealing, a method of sealing the entrance with an adhesive tape, a method of sealing both the entrance side and the contents side of the chuck with an easily peelable material, etc. are adopted. The plastic container with a chuck obtained by these methods has a chuck function in order to maintain the hermeticity, or when the contents are attached to the plastic zipper when the contents are filled, or when the contents are pinched in the chuck female hook claw. In order to prevent the risk of deteriorating the quality or deteriorating the quality of the chuck when the contents are sticky or putrefactive and colored, it is usually necessary to fill from the bottom. There is.

On the other hand, a plastic container such as a gusset bag, a standing pouch or a paper pack laminated with a thermoplastic resin, which can be used even in a large capacity, cannot be filled from the bottom because of a structural problem at the bottom, so that the container cannot be filled from the bottom. It was rarely used as a plastic container with a chuck because it was required to be filled from.
Therefore, most of the packaging materials as a container with a zipper have been used mainly for flat bags having a small capacity (poor economic efficiency).

Further, in the case of an easily peelable container that can be easily opened, peeling of the easily peelable layer easily occurs due to internal pressure, so that there are problems in transport stability and storage stability, and there is a limitation in use. . Particularly in the case of a container having a large internal volume / packaging material area / ratio, the seal portion is easily broken by the internal pressure, and the seal which is not easily broken and the easy peeling of the seal are incompatible problems. It is a container with a large internal volume / packaging material area ratio, such as a gazette bag, a standing pouch, or a paper pack, which is easy to open and resealable, and the sealed portion is destroyed by internal pressure. There is a need for a plastic container that does not or does not occur easily.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a plastic container having a large internal volume / packaging material area / ratio, which has an easy opening property, is excellent in transport stability and storage stability, and has a seal portion with an internal pressure. It is an object of the present invention to develop a container having a plastic zipper that is difficult to be broken even if it is present and that can be resealed even after opening, and a filling method for the container.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a plastic container having a plastic chuck at its inlet, one of the chucks being provided on the inner surface of the container, and the other of the chucks engaging with this being a sealing sheet or the like. A plastic with a chuck formed by engaging and further sealing the sealing sheet or the like on the content side of the chuck with an easily peelable joining portion provided in parallel to the inner surface of the container provided with one chuck. container. Engage a plastic chuck and attach a sealing sheet or the like provided with the other chuck with easily peelable joints on both the content side and the inlet side of the inner surface of the container provided with one chuck. A joined plastic container with a zipper. Engage the plastic zipper and seal the sealing sheet with the other zipper on the inner surface of the container with the one zipper and the inlet side, and the easily peelable joint on the content side. A plastic container with a chuck, which is provided and joined, and a tear line is provided between the sealing portion on the inlet side and the plastic chuck. At least 0.5 mm between the plastic chuck and the easy-peelable joint on the contents side that is provided in parallel with it.
A plastic container with a zipper provided with a space of. The zippered plastic container is a gusset bag, a standing pouch, or a laminated paper pack. A method for filling a container with a chuck, which comprises filling the contents from the inlet side of the above-mentioned plastic container with a chuck and sealing the sheet or the like of the plastic container not provided with a chuck and the upper portion of the sealing sheet or the like. The tip of the easily peelable joint on the content side is at least 2 mm from the end of the sealing portion such as the sheet of a plastic container without a chuck and the sealing sheet of the container with a chuck. Filling method. The above-mentioned object was achieved by developing.

In the present invention, as the material of the plastic container, the same material as that of the plastic chuck or a plastic having good adhesiveness to the same is usually used. Generally, but not exclusively, low density polyethylene,
High density polyethylene, polypropylene, polyester,
A commonly used thermoplastic resin such as polyamide or polyvinyl chloride is used. However, depending on the size of the container and the purpose of use, a laminate of these sheets, a laminate with paper or aluminum foil, and a sheet obtained by vapor-depositing a metal or a metal oxide may also be used. As the container, a gusset bag, a standing pouch, a flat bag, or a paper obtained by laminating a resin on a plastic film or sheet (both the film and the sheet are referred to as a sheet in the present invention) produced from the above resin is used. There are packs, etc.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of the vicinity of a sealing sheet or the like at the container inlet portion of the present invention, and FIG. 2 is a cross-sectional view of a standing pouch having this sealing portion. In these, one surface 1 of a plastic container (the contents and the bottom are not shown) consisting of sheets 11-a and 11-b
1-b Inner surface of plastic container 1
One of 5 is provided. The other side of the chuck 15 having the same length as the length of the one chuck is connected to the sealing sheet or the like 12 made of the same material as the sheet of the container having the same width as the width of the container 12 (one surface 11-b of the plastic container as shown in FIG. 4). It can also be extended and folded back and used.) A chuck is engaged, and the easily peelable joint portion 14 on the contents side of the container is joined with a sheet or the like with an easily peelable material to form a plastic container. In this case, in addition to the joining portion 14, it is also a preferable aspect to provide an easily peelable joining portion 13 made of an easily peeling material similar to the joining portion 14 on the inlet side. The easily peelable joint portions 14 or 13 and 14 can be provided with, for example, a heat-sealable resin layer by part coating or coextrusion. This heat-sealing resin may be of any known type as long as it does not have a very high adhesive strength, and may be of the interfacial peeling type or cohesive failure type, either alone or in combination. As the resin which meets this purpose, ethylene-vinyl acetate copolymer, vinylidene chloride resin, modified polypropylene resin, modified polyethylene resin and the like can be used. The easily peelable joints 14 or 13 and 14 are
At least 0.5 mm from the chuck, preferably 1
It is to provide a distance of mm or more. If it is less than 0.5 mm, the chuck may be thermally affected and deformed. The width of the easily peelable joining portions 14 or 13 and 14 is not particularly limited as long as it is 2 mm or more. After filling the inside of the container with contents, the position where A on the upper side of the sheet 11-a and B on the upper side of the sealing sheet 12 are sealed by the easily peelable joint on the content side. At least 2m from the end of the stop
It is preferable that the position is such that it is exposed to the contents side. Two
If the thickness is less than mm, the easily peelable joint may be peeled off when internal pressure is applied to the container.

The surface 11-b of the container sheet or the like and the chuck 15 provided on the sealing sheet 12 or the like are joined together to join the easily peelable joint portion 14 (and the easily peelable joint portion 13 at the same time). In the case where the plastic container is filled with contents having stickiness or adhesiveness, the portion of the plastic zipper 15 is covered with the sealing sheet even if the contents are filled from the inlet side. Also in the case, the contents do not adhere to the chuck portion, so that the contents can be safely filled. After filling the contents, the upper part A of the container sheet 11-a and the upper part B of the sealing sheet 12 can be sealed for packaging. This sealing may be performed in any form as long as it can be sealed in an automatic packaging line, but it is usually efficient to perform heat sealing. In opening the packaging container thus sealed, there is no need for scissors or the like, and the chuck 15 and the easily peelable joint portion 14 or 13 between the sheet 11-b and the sealing sheet 12 are not required. It can be easily opened by peeling off 14 and 14. Even when there is the easily peelable joint portion 13, it can be easily opened.

As another embodiment of the present invention, as shown in FIG. 3, instead of the easily peelable joint portion 13 on the upper portion, a joint portion 13 'which cannot be peeled off by heat sealing or the like is used. It is also possible to provide the slit line 17 between the chuck 15 and the joint portion 13 ′. When the ripping line 17 is provided, the container 11-a may be manufactured using a uniaxially stretched film or the like so that the ripping is easy. Further, there are various applicable methods such as providing a notch for slitting, making a perforation or putting a slitting tape.

Further, as shown in FIG. 4, a sealing sheet or the like 1
A modification method in which the sheet 11-b of the container or the like is folded and used instead of 2 may be considered. Even in this case, the tear line 17 is located on the inlet side of the chuck 15. FIG.
Alternatively, in the case of the container of the type shown in FIG. 4, the place to be sealed after the contents are filled may be on the inlet side of the slit line, and the sheet of the container or the like 11-
Since three sheets a, 11-b, and the sealing sheet 12 can be heat-sealed at one time, efficient sealing is possible.

[0012]

In a large capacity simple plastic container such as a gusset bag, a standing pouch, a laminated paper pack, etc., the bottom of the container is complicated. Containers that cannot be sealed at the bottom after filling the contents are forced to be filled from the container inlet side.Therefore, it is almost practically used as a plastic container equipped with a plastic chuck for resealing. There wasn't. In the present invention, the chuck is completely protected by using a sealing sheet or the like and an easily peelable joint portion is provided on the content side, and filling from the inlet side is enabled. Further, the tip of the easily peelable joining portion 14 such as the sealing sheet on the contents side goes out to the contents side by at least 2 mm from the end of the sealing portion such as the sheet of the plastic container not provided with the chuck and the sealing sheet. By thus providing the joint portion 14, the pressure resistance of the container has been successfully increased. Although the reason for this cannot be clarified, when the joint portion 14 is less than 2 mm from the end of the sealing portion, the internal pressure may directly act on the easily peelable joint portion 14 to cause peeling. When the portion 14 is at least 2 mm from the end of the sealing portion, the internal pressure comes to be directly applied to the sealing sheet 12 and the sealing portion of the sheet 11-a of the container, etc. It is presumed that this is because the direct pressure is not applied to.

[0013]

【Example】

(Example) A plastic chuck as shown in FIG. 1 was provided on the inlet side of a standing pouch having a width of 140 mm and a height of 150 mm. The material of the container was a film of 12 μm polyester, 15 μm polyamide, and 60 μm unstretched polypropylene from the outside, and each layer was a laminated film dry-laminated with a two-component curable urethane dry laminate adhesive for retort. The encapsulating sheet or the like is made of a film of 60 μm unstretched polypropylene, 12 μm polyester, 15 μm polyamide, and 60 μm unstretched polypropylene, and the adhesion between layers is similarly dry-laminated using a two-component curable urethane dry laminate adhesive. The laminated film was used. Sheet 1
1-b and the encapsulating sheet 12 are formed with a non-stretched polypropylene chuck, and an easily peelable acrylic resin is used for the retort on both sides of the chuck in parallel with the chuck.
Via liquid curing type urethane dry laminate adhesive,
Part coating was performed with a width of 5 mm at a distance of 1 mm from the chuck. A standing pouch was formed by joining the chucks, and further joining the joining portion of the easily peelable acrylic resin which was part-coated with a bag-making machine and also joining the bottom portion.

390 g of water was added to this standing pouch.
After being filled, the sheet 11-a and the sealing sheet 12 were heat-sealed with a width of 5 mm on the 3 mm upper portion of the easily peelable joining portion on the chuck. After subjecting this packaging bag to retort treatment at 100 ° C. for 10 minutes, the heat-sealing strength between unstretched polypropylenes and the heat-sealing strength of the easily peelable acrylic resin were measured by the method of JIS Z-0238. 0.1 kgf / 15 mm, 0.4 kgf /
It was 15 mm. Further, after applying a compressive load of 40 kgf by the method of JIS Z-0238, JIS Z-023
Leakage test was conducted by Method B of 8. The results are shown in Table 1.

(Comparative Example) Width 140 mm, height 150 mm
A standing pouch having a plastic chuck and an ordinary stop portion having an easily peelable joint as shown in FIG. 5 was used on the inlet side of the standing pouch. The material of the container was a film of 12 μm polyester, 15 μm polyamide, and 60 μm unstretched polypropylene from the outside, and each layer was a laminated film dry-laminated with a two-component curable urethane dry laminate adhesive for retort. An unstretched polypropylene chuck is formed on the inside of the container sheets 11-a and 11-b, and an acrylic resin that is easily peelable in parallel with the chuck is provided at a distance of 1 mm from the chuck on the inlet side of the chuck. Was part-coated with a width of 5 mm through a two-component curing type urethane dry laminate adhesive for retort. After joining the bottom parts to form a standing pouch, water 3
90 g was filled, a chuck was joined, and an easily peelable acrylic resin was heat-sealed, and then retort treatment was performed at 100 ° C. for 10 minutes, and the heat seal strength of the easily peelable acrylic resin was measured. It was 4 kgf / 15 mm. Furthermore, 40 kgf by the method of JIS Z-0238
A leak test was performed by applying a compressive load of. The results are shown in Table 1.

[0016]

[Table 1] As described above, the plastic container with a chuck of the present invention is rich in pressure resistance and is easy to open, while the container with a chuck having only the easily peelable joint is resistant to pressure and has a gazette. It has proved difficult to use for large containers such as bags and standing pouches.

[0017]

INDUSTRIAL APPLICABILITY The plastic container of the present invention is lightweight, inexpensive, easy to open, and has a chuck so that it can be resealed. Since the product can be filled from the inlet side, it can be used for a large container such as a large gusset bag or a standing pouch. Furthermore, since it is also excellent in pressure resistance, it is a plastic container that can be applied in a wide range of fields in terms of transport stability, storage stability, and the like.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a container inlet portion of the present invention.

FIG. 2 is a sectional view of a standing pouch of the present invention.

FIG. 3 is a sectional view of a slitting line type standing pouch of the present invention.

FIG. 4 is a sectional view of another slitting line type standing pouch of the present invention.

FIG. 5 is a cross-sectional view of a standing pouch provided with an easily peelable joint and a chuck for comparison.

[Explanation of symbols]

 11-a Container sheet, etc. 11-b Container sheet, etc. 12 Sealing sheet, etc. 13 (Inlet side and contents side) Easy peeling joint 13 'Difficult peeling joint 14 (Inlet side and contents side) Easy peeling Joining part 15 Plastic chuck 16 Flap 17 Cutting line 21 Contents A Container sealing part B Container sealing part

Claims (7)

[Claims] 1. In a plastic container having a plastic zipper at the inlet, one of the zipper is provided on the inner surface of the container, and the other zipper which engages with the zipper is provided on a sealing sheet or the like to be engaged with the sealing sheet. A plastic container with a chuck in which a stop sheet or the like is bonded on the content side of the chuck with an easily peelable bonding portion provided in parallel with the inner surface of the container provided with one chuck. 2. A sealing sheet which is engaged with a plastic chuck and is provided with the other chuck is easily peeled off on both the content side and the inlet side of the inner surface of the container provided with one chuck. The joint part is provided and joined.
The described plastic container with a zipper. 3. A sealing sheet, which is engaged with a plastic chuck and is provided with the other chuck, is sealed at the inner surface of the container provided with one chuck and the inlet side, and is easily peeled off to the content side. The plastic container with a chuck according to claim 1, wherein a flexible bonding portion is provided for bonding, and a tear line is provided between the sealing portion on the inlet side and the plastic chuck. 4. The plastic chuck and the easily peelable joint portion on the content side provided in parallel with the plastic chuck are provided with an interval of at least 0.5 mm.
The described plastic container with a zipper. 5. The plastic container with a chuck according to claim 1, 2, 3 or 4, wherein the plastic container with a chuck is a gusset bag, a standing pouch, or a laminated paper pack. 6. Filling the contents from the inlet side of the plastic container with a chuck according to claim 1 to 5 and sealing the sheet or the like of the plastic container without the chuck and the upper part of the sealing sheet or the like. A method for filling a container with a chuck, characterized in that. 7. The tip of the easily peelable joint on the content side is
7. The method for filling a container with a chuck according to claim 6, wherein the sheet and the like of a plastic container not provided with a chuck and the end of a sealing portion such as a sealing sheet protrude at least 2 mm from the content side.