JP3101309U - Film bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film bag made of a laminated cylindrical film or a co-extruded cylindrical film as a material, in which a predetermined number of film bags are stacked while suppressing the occurrence of warpage (curling) in an opening. To provide a film bag that can prevent bulkiness.
SOLUTION: A co-extruded cylindrical film 1a (or a laminated cylindrical film) folded flat so that opposing film pieces 10 and 10 overlap each other is used as a material, and an opening 11 is formed at one end and the other end is formed. In the film bag 1 in which the bottom closed seal portion 12 is formed, a temporary seal portion 13 in which opposing film pieces are temporarily adhered so as to be peelable is formed in the opening portion 11.
[Selection diagram] Fig. 1

Description

  The present invention relates to a film bag made of a laminated cylindrical film or a co-extruded cylindrical film.

2. Description of the Related Art Conventionally, a film bag is made of a cylindrical film that is folded flat so that opposing film pieces are superimposed, and has an opening at one end and a bottom closing seal portion at the other end.
The manufacturing method in this case is to form a bottom closing seal portion on the cylindrical film while feeding the cylindrical film, cut the portion to be the opening to form a bag body per sheet, and form a predetermined number of bags. It is designed to be packaged in a bundle.
As a material of the film bag, a plastic material such as polyethylene is generally used. In order to improve gas barrier properties and waterproofness, a laminated cylindrical film formed by forming a plurality of plastic materials in layers or co-extrusion. A device using a cylindrical film is known.

However, when the laminated cylindrical film or the co-extruded cylindrical film is used as a material, the properties (the coefficient of thermal expansion, etc.) of the plastic material forming the layer are different, so that the opening formed by cutting the cylindrical film is warped (curled). ) Occurs.
For this reason, when a bundle of a predetermined number of film bags is formed, the opening portion becomes bulky, the lamination state when the bundle is formed is disturbed, and the commercial value is impaired due to a messy appearance. There was a problem.

In addition, as a film bag, there is conventionally known a film bag in which a temporary bonding portion is formed in an opening for the purpose of ensuring hygiene by sealing the inside of the bag (Patent Document 1).
This film bag is formed with an opening-side seal to prevent dust and bacteria from entering the bag from the opening and to ensure hygiene, and is a laminated cylindrical film or co-extruded cylindrical film. It is not intended for a film bag made of U.S.A., and there is no purpose to prevent the opening from warping.
JP-A-11-130102

  The present invention has been made to solve the above-described problem, and is intended for a film bag made of a laminated cylindrical film or a co-extruded cylindrical film, and suppresses the occurrence of warpage deformation (curl) in an opening. It is another object of the present invention to provide a film bag that can prevent bulkiness when a predetermined number of film bags are stacked.

In order to solve the above problems, the film bag of the present invention (Claim 1)
A laminated cylindrical film or a co-extruded cylindrical film folded flat so that the opposing film pieces overlap each other was limited as a material, and an opening was formed at one end and a bottom closed seal was formed at the other end. In the film bag,
A temporary seal portion in which the opposing film pieces are temporarily adhered so as to be peelable from each other is formed in the opening.

The film bag of the present invention (Claim 2)
In the film bag according to the first aspect, the temporary seal portion is formed in the opening portion while holding a grip portion between the temporary seal portion and the opening edge portion.

In addition, as a laminated cylindrical film, a three-layer dry lamination product (for example, PBT / AD / PO) or a five-layer dry lamination product (for example, PBT / AD / NY / AD / PO, PO / AD / NY / AD / PO, PBT / AD / EVOH / AD / PO) and dry lamination four-layer products, and other laminated cylindrical films can also be used as the material of the film bag of the present invention.
PBT: polybutylene terephthalate AD: adhesive polyolefin NY: nylon (6-NY, CO-NY, MXY-NY)
PO: Polyolefin resin EVOH: Ethylene vinyl alcohol copolymer resin

Examples of the co-extruded cylindrical film include a three-layer co-extrusion product (eg, HDPE / PE / LDPE (LLDPE), NY / AD / PO) and a five-layer co-extrusion product (eg, NY / AD / NY / AD / PO, NY / AD / EVOH / AD / PO, NY / NY / EVOH / AD / PO), and other co-extruded cylindrical films can also be used as the material of the film bag of the present invention.
HDPE: High density polyethylene PE: Polyethylene LDPE: Low density polyethylene LLDPE: Linear low density polyethylene

In the film bag according to the present invention (claim 1), a temporary sealing portion is formed in the opening, and the opposing film pieces are temporarily bonded to each other by the temporary sealing portion, so that the laminated cylindrical film or the co-extruded cylindrical film can be formed. Warpage deformation (curl) of the opening that occurs when the material is used can be suppressed.
Thereby, even if the film bags are bundled in a predetermined number, the bulk can be prevented.

  Then, since the temporary seal portion is formed by temporarily adhering the opposing film pieces so that the opposing film pieces can be peeled off, when the temporary seal portion is peeled off so that the opening edge is widened, the opening is opened, and the normal bag is opened. Can be used as

  At this time, if a gripping portion is provided (claim 2), if the gripping portion is gripped with a fingertip, a force is easily applied, and the peeling operation is simplified.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partially cutaway front view of a film bag according to a first embodiment of the present invention.

This film bag 1 is made of a co-extruded cylindrical film 1a which is folded flat so that opposing film pieces 10, 10 are superimposed on each other, and has an opening 11 at one end and a bottom closing seal at the other end. 12 are formed.
A temporary seal portion 13 is formed in the opening 11 at a fixed width from the opening edge 14 by temporarily adhering the opposing film pieces 10 so that they can be separated from each other.

In this case, the bottom closed seal portion 12 is obtained by completely welding the co-extruded cylindrical film 1a to a non-peelable state by heat welding at a temperature higher than its thermal softening point.
Further, the temporary seal portion 13 is a material in which the co-extruded cylindrical film 1a can be peeled off by heat welding at a temperature lower than its thermal softening point. Heat is applied while pressing the pressing mold.
Since the co-extruded cylindrical film 1a has a different thermal softening point depending on the material, the complete sealing of the bottom closing seal portion 12 and the temporary welding of the temporary seal portion 13 are performed at a temperature corresponding to the material.

Therefore, in this film bag 1, the temporary sealing portion 13 is formed in the opening 11, and the opposing film pieces 10, 10 are temporarily bonded (temporarily welded) to each other by the temporary sealing portion 13. Deformation (curl) can be suppressed.
Thereby, even if the film bags 1 are bundled in a predetermined number, the bulk can be prevented.

  Since the temporary sealing portion 13 is formed by temporarily adhering the opposing film pieces 10 and 10 to each other in a peelable manner, the temporary sealing portion 13 is peeled off so that the opening edge 14 is widened in use. Opens and can be used as a normal bag.

Next, FIG. 2 is a partially cutaway front view of a film bag according to a second embodiment of the present invention.
This film bag 2 is made of a co-extruded cylindrical film 2a which is folded flat so that opposing film pieces 20, 20 are superimposed on each other, and has an opening 21 formed at one end and a bottom closing seal portion at the other end. 22 are formed.
A temporary seal portion 23 is formed in the opening 21 by temporarily bonding the opposing film pieces 20 to each other so that the opposing film pieces 20 can be separated from each other.

Note that the grip portion 25 is set to have a width that allows the user to grip the portion with a fingertip, and an appropriate size is about 5 mm to 20 mm.
As described above, since the grip portion 25 is provided, when the opening portion 21 is widened, the force is easily applied by gripping the opening portion 21 with a fingertip, and the peeling operation is simplified.
Other configurations and operations are the same as those of the first embodiment.

Next, FIG. 3 is a partially cutaway front view of a film bag according to a third embodiment of the present invention.
This film bag 3 is an example in the case of using a laminated cylindrical film 3a which is folded flat so that the opposing film pieces 30, 30 are superimposed on each other.
The laminated cylindrical film 3a is formed by bending a sheet-shaped laminated film into two folds and welding both side ends thereof at side ends to form a side seal portion 35, thereby forming a cylindrical shape.
The film bag 3 is made of the laminated cylindrical film 3a, and has an opening 31 at one end and a bottom closing seal portion 32 at the other end. , 30 are formed to have a fixed width from opening edge 34 by temporarily bonding releasably to each other.

Next, FIG. 4 is a partially cutaway front view of a film bag according to a fourth embodiment of the present invention.
This film bag 4 is an example in the case of using a laminated tubular film 4a which is folded flat so that opposing film pieces 40, 40 overlap each other as a material.
The laminated cylindrical film 4a is formed by bending both sides of a sheet-shaped laminated film and welding both side ends thereof at a center to form a center seal portion 46, thereby forming a cylindrical shape.
The film bag 4 is made of the laminated cylindrical film 4a, and has an opening 41 formed at one end and a bottom closing seal portion 42 formed at the other end. , 40 are temporarily adhered so as to be peelable from each other, and are formed by holding a margin 45 with the opening edge 44.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this.
For example, regarding the method of completely welding the bottom closing seal portion and the method of temporarily bonding the temporary bonding seal portion, either an external heating method or an internal heating method is used depending on the material of the laminated cylindrical film or the co-extruded cylindrical film. Is also good. The heating temperature can be appropriately set according to the material of the laminated cylindrical film or co-extruded cylindrical film, and the seal width can also be appropriately set. The magnitude of the pressure of the pressing die can also be set appropriately.
Further, in order to make the product shape of the film bag compact, the film bag may be folded in two or three, or a gusset may be formed on both sides, which may be folded in two or three.

FIG. 2 is a partially cutaway front view of the film bag according to the first embodiment of the present invention. FIG. 4 is a partially cutaway front view of a film bag according to a second embodiment of the present invention. FIG. 6 is a partially cutaway front view of a film bag according to a third embodiment of the present invention. FIG. 7 is a partially cutaway front view of a film bag according to a fourth embodiment of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Film bag 1a Coextruded cylindrical film 10 Film piece 11 Opening 12 Bottom closing seal part 13 Temporary seal part 14 Opening edge 2 Film bag 2a Coextruded cylindrical film 20 Film piece 21 Opening 22 Bottom closed seal part 23 Temporary Seal part 24 Opening edge part 25 Grab allowance part 3 Film bag 3a Coextrusion cylindrical film 30 Film piece 31 Opening part 32 Bottom closing seal part 33 Temporary seal part 34 Opening edge 35 Side seal part 4 Film bag 4a Coextrusion cylindrical form Film 40 Film piece 41 Opening 42 Bottom closure seal 43 Temporary seal 44 Opening edge 45 Grab allowance 46 Center seal

Claims (2)

A film bag made of a laminated tubular film or a co-extruded tubular film that is folded flat so that opposing film pieces are superimposed, and having an opening formed at one end and a bottom closed seal portion formed at the other end. At
A film bag, characterized in that a temporary seal portion in which the opposing film pieces are temporarily adhered so as to be peelable is formed in an opening. 2. The film bag according to claim 1, wherein the temporary seal portion is formed in the opening with a gripping portion held between the temporary seal and the opening edge.

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