JPS58171345A - Bag with see-through section and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bag having a transparent part and a method for manufacturing the same. More specifically, an opaque sheet is laminated to 50% or more of the area of one or both sides of the body made of a transparent thermoplastic resin film, and a transparent sheet is attached to the -E part 13 and/or the lower part of the bag. The present invention relates to a bag in which a viewing portion is formed so that the entire contents can be seen from outside the bag, and a method for easily and continuously manufacturing the bag.

Up until now, envelopes with windows made of a single-piece material, or envelopes with windows made of an opaque material with a window hole and a transparent film pasted to the window hole, have been proposed, but the manufacturing process for these envelopes is complicated. Not only that, but it also has the disadvantage of a large amount of material loss.

A method has also been attempted in which a see-through portion is provided by applying wax or the like to a portion of an opaque material and melting it to make it transparent, but this method requires high material costs and a complicated manufacturing process. Further, the transparency of the transparent portion is also insufficient.

The present invention aims to eliminate such drawbacks. That is, in the present invention, an opaque sheet is laminated via an adhesive to an area of 50 inches or more on one or both sides of the body of a bag made of a transparent thermoplastic resin film, and an opaque sheet is attached to the upper and/or lower part of the grip. A bag having a see-through part 4 and a method for manufacturing the same, which is characterized by being provided with a see-through part, that is,
50 mm on one or both sides of a flattened strip of pinched transparent thermoplastic inflation tube.
After laminating an opaque sheet to an area of % or more via an adhesive and incising one edge, heat sealing is performed at regular intervals in the transverse direction of the strip, and the heat sealed portion is The present invention relates to a method for manufacturing the bag, characterized in that the bag is cut into pieces.

A bag like the one above is made of opaque/opaque material with a portion of the transparent material remaining.
- Since the bag is laminated, the contents can be clearly swallowed, and the opaque sheet allows the bag to stand up, making it easy to use.

It is also easy to print on opaque areas.

Furthermore, in the present invention, the above-mentioned bag can be made into a gusset bag or a square bottom bag, and can also be used for sealed packaging as a bag with a zipper.

The transparent thermoplastic film used as the material for the bag of the present invention includes high-pressure or medium-pressure polyethylene, preolefin resins such as propylene, nylon-6, and nylon-6.
6,6, polyamide resin such as nylon-1,2 % polyvinyl alcohol resin, vinyl chloride resin 1. je
A film made of a resin homopolymer, copolymer, or a mixture thereof, such as lJ cardinate resin, or a melting point,
It includes a laminated film in which these films are combined in consideration of durability, gas/S171-resistance, and other physical properties. For example, there are various combinations such as -diethylene/polyvinylidene chloride, low density polyethylene/high density dilyethylene, polyethylene/nylon, saponified polyethylene/ethylene-vinyl acetate copolymer, polyethylene/nylon/teriethylene, etc. These films are not particularly limited in terms of transparency, as long as they have substantially transparency to the extent that the contents of the bag can be identified. Furthermore, among the above-mentioned films, those that are particularly inexpensive, have high strength, and are easy to mold include polyolefin resins and polyvinyl chloride resins.

Examples of the opaque sheet of the bag of the present invention include papers such as Japanese paper, stretchable paper, and synthetic paper, sheets containing inorganic fillers such as calcium carbonate, and colored films. These materials are not particularly limited in type as long as they are opaque thin layers. As the opaque sheet, it is preferable to use one with appropriate hardness because the bag will have a stronger elasticity.

In the present invention, the opaque sheet is adhered to 50% or more of the area of one or both sides of the body of the bag made of the transparent thermoplastic resin film, and the upper and/or lower part of the bag is A see-through portion is formed without an opaque sheet attached to the surface. If the adhesion area of the opaque sheet is less than 50 mm, the rigidity of the bag will be impaired and it will be inconvenient to use.

Another feature of the bag of the invention is that the bottom and/or sides of the bag can be easily gusseted, thus
By using a square bottom bag, the storage capacity of the bag can be increased. Furthermore, since a synthetic resin zipper can be attached, a sealable bag can also be made. In particular, in the case of bags using films containing chemicals such as antifungal agents, fragrance agents, desiccant agents, odor absorbers, and insect repellents, the chemical effects can be exerted on the copper content due to this airtight bag. It is suitable.

In addition, it can be easily sealed without the need for separate strings, fasteners, etc.
-It is convenient because it can be done.

Hereinafter, the bag having a transparent part of the present invention and its manufacturing method will be explained in more detail with reference to the illustrated embodiments.

FIGS. 1 and 2 show the basic structure of a bag having a transparent part according to the present invention. The bag 1 consists of a bag body 2 made of a transparent thermoplastic resin film and an opaque sheet 3 attached to the body of the bag body 2 via an adhesive layer 4. The opaque sheet 3 is not attached to the entire surface of the bag 2, but is attached to an area of 50 or more of the area of one or both sides of the bag 2, leaving the upper part 5 and /'' or the lower part 6 of the bag 2. In the illustrated example, opaque sheets 3 are provided on both sides of the bag body 2, and transparent parts 7 are formed in the upper part 5 and lower part 6.

Note that the adhesive edge 8 delimited by the broken line is produced when the bag is made by the manufacturing method of the present invention described later. The bag 1 itself of the present invention can be, for example, a bag formed by sealing three sides of a sheet material, or a bag formed by cutting an infusion film in the transverse direction and sealing only the bottom of the bag (the side edges of the bag are formed by simply sealing the film). (folded) etc.

In the method of manufacturing a bag having a transparent part according to the present invention, as shown in FIG. Apply adhesive layer 4 to the surface. The adhesive 4 may be applied with various adhesives or hot melt adhesives by roller coating, spray coating, etc., or may be made of low-density polyethylene, ethylene-vinyl acetate copolymer, etc. by extrusion lamination. When formed, it is suitable for continuous process and is inexpensive. Also,
As will be described later, this is convenient when applying gusseting to the bag.

Next, the opaque sheet 3 is pasted onto the adhesive layer portion of the strip 9 to which the adhesive layer 4 has been applied.

Flattening of the above blown film, adhesive layer 4
The application of the opaque sheet 3 and the attachment of the opaque sheet 3 can be carried out continuously while moving the blown film in the longitudinal direction, which is suitable for making a large number of bags.

Furthermore, the adhesive layer 4 and the opaque sheet 3 may be formed on only one side of the strip-like material 9, or may be applied on both sides with different widths.

Next, as shown in FIG. 4, the edge 10 on one side of the strip 9 is incised, and then, as shown in FIG. 5, heat-sealed parts 11 are formed at regular intervals in the transverse direction of the strip 9. , by cutting the central part along the chain line shown in the figure, it is possible to obtain a bag It having a transparent part of the present invention as shown in FIGS. 1 and 2.

In another embodiment of the invention, the bottom and/or sides of the bag can be gusseted, as shown in FIGS. 6A and 6B. Furthermore, Figures 6 and 8
In the figures, the adhesive layer is omitted. In this case, before or after pasting the opaque note 3, the strip 9 shown in FIG.
One end edge 10 is incised and the other end edge 10a is gusseted to form a gusset portion 12. On the other hand, when applying gusset processing to the sides of the bag, it can be obtained by cutting the strip 9 to which the opaque sheet 3 is attached at regular intervals, applying gusset processing and heat sealing. Note that it is also possible to partially fold the opaque sheet 3 into the gusset portion 12 as shown in FIG. 6(B).

In addition, as shown in FIGS. 7(A) and 7(B), when the bottom of one bag is folded and a heat-sealed portion 13 is formed, the low-density polyethylene is used as the adhesive layer 4 to form a layer with a width larger than the width of the strip 9. After being applied with an extrusion laminator 3, the end portions are folded into the state shown in FIG. 7(A) or (B) and heat sealed from the outside of the strip 9, thereby forming a heat-sealed portion 13. These bags are particularly desirable because they have a matrix or rectangular bottom and are self-supporting when filled with articles, increasing their commercial value. Further, the extrusion lamination described above is effective when the bag body 2 is made of a laminated film and the melting point of the outer layer is higher than the melting point of the inner layer.

Another embodiment of the present invention relates to a method for manufacturing a bag with a zipper, and as shown in FIG. 8(A), after cutting the entire edge of the strip 9, Synthetic resin fasteners 14 and 15 are heat-sealed along the portion 16. In this case, as shown in FIG. 8(B), the fastener 14a
When 15a is heat-sealed so that it does not protrude from the open end 16, the open end 16 and the fastener 14a are bonded together.

15a separates into two leaves, so when the contents are put into the bag, the contents may remain between the zippers 14a, 15a and the open end 16. Furthermore, since there is a risk of the zipper peeling off when opening the package, please refer to Figure 8 (
As shown in A), it is preferable that the edges of the fasteners 14 and 15 are fused at positions outside the open end 16 of the bag.

Production example: As a transparent thermoplastic resin, a multilayer inflation cheesecloth of nylon/adhesive resin (maleic acid-modified polyethylene)/low-density polyethylene (total thickness 50 μm) is made by a conventional method from the outside to the inside. This inflation cheese was flattened by pinching it (width: 45 mm).
0m+). After applying an adhesion promoter to one side of the inflation tube, MI=4.0. d=0.
923 low density polyethylene is extrusion coated at a resin temperature of 300'C and a thickness of 20 μm, and at the same time, through this coating layer, an opaque sheet with a basis weight of 789/rr? The kraft paper was fed out and extrusion lamination was performed. The width of the kraft paper was cut in advance to 400 mm, which is smaller than the width of the inflation tube, and extrusion lamination was performed by aligning one end of the paper with one end of the inflation tube. Extrusion lamination was applied to the other side of the inflation tube in the same manner. The width of the T-die film for extrusion lamination is 460 m wider than the width of the inflation tube, and just before winding up the extrusion lamination cheese, it is cut to a width of about 2 mm < 452 cm wider than the width of the inflation tube using a cutter. did. In this way, the end of the L fc inflation cylinder tube that is not pasted with paper? A gusseting process was performed by folding 5ofi, and the end where the other paper was to be pasted was cut out, and then a zipper was bonded by heat sealing as shown in FIG. 8(A). After that, the longitudinal direction of the film is 250+w
By heat-sealing each bag and cutting out the center of the heat-sealed part, a pouch with a see-through part of about 250W+X400+W+ was manufactured so that the contents could be seen.

As mentioned above, the bag with a transparent part of the present invention is easy to handle because the bag itself is made of an opaque sheet, and the contents can be identified from the outside. Since it can be displayed completely and can be made airtight, it is useful as a storage bag such as a mold-proof bag, an insect-proof bag, and a scented bag. In addition, the bag manufacturing method of the present invention can be easily carried out without requiring complicated steps.
It is suitable for manufacturing bags with transparent parts as described above continuously at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a bag having a transparent part of the present invention;
FIG. 2 is a vertical cross-sectional view taken along the line ■-■ in FIG. 1, and FIGS.
The figure is a vertical cross-sectional view showing the process of pasting the opaque sheet.
The figure is a longitudinal cross-sectional view of the strip, Figure 5 is a plan view of the strip, and Figure 6 is a plan view of the strip.
Figures (A) and (B) are partial longitudinal cross-sectional views of the belt-like material showing the state of gusset processing, and Figures 7 (A) and (B) are the longitudinal cross-sectional views of the belt-like material when the ends are folded in to form a seal. FIG. 8(A) is a partial vertical cross-sectional view of a strip-shaped article equipped with a Bl fastener. 1... Bag; 2... Bag body; 3... Opaque sheet ; 4... Adhesive layer; 7... Transparent section:
8... Adhesive edge; 9... Strip-like material; 11
．． 13... Heat sealing part; 12... Gazette part:
14 + 14a + 15+ 15a... Fastener patent applicant: Nippon Petrochemical Co., Ltd. Agent: Togo Co., Ltd. Patent attorney: Hajime Maedaka IW4 I! ! 2 Figure 3 Figure 4 Figure 1; 1115 Figure 6 I7 Figure 8 (B)

Claims (1)

[Scope of Claims] (]) One side of the body of the bag made of a transparent thermoplastic resin film (- is an opaque/-
2. A bag having a transparent part, characterized in that the bag is laminated with an adhesive and the transparent part is provided at the upper and/or lower part of the bag. (2) Claim 1, characterized in that the bottom and/or sides of the bag are gusseted.
A bag with a self-contained transparent part. (3) A synthetic resin fastener is attached to the opening of the bag so as to protrude beyond the edge of the opening 11. or a bag having a transparent part according to item 2. (4) A bag having a transparent portion according to any one of claims 1 to 3, wherein the thermoplastic resin film is a laminated film. (5) Claim 4, characterized in that the laminated film includes at least one layer of a glial film.
A bag having a transparent part as described in 2. (6) A bag having a see-through portion according to any one of claims 1 to 5, wherein the opaque sheet is paper. (7) An opaque sheet is attached to 50% or more of one side or both sides of a flattened strip by pinching a transparent thermoplastic resin inflation tube through an adhesive, and A method for producing a bag having a see-through part, which comprises: cutting one end edge, then heat-sealing the strip at regular intervals in the transverse direction, and cutting the heat-sealed portions. (8) A method for manufacturing a bag having a see-through portion according to claim 7, wherein the adhesive is a low-density I-lyeethylene manufactured by extrusion laminate, John. (9) When the inflation tube is a laminated film consisting of an outer layer film with a high melting point and an inner layer film with a lower melting point, laminating low density polyethylene by extrusion lamination to a width greater than the width of the strip. Claim 7 or 8 is characterized in that:
Method for manufacturing a bag having a transparent part as described in Section 1. (, ], ()) Before or after laminating the opaque strip, one edge of the strip is incised and the other edge is gusseted. 7
A method for producing a bag having a transparent part according to any one of Items 1 to 9. (1) Female and male fasteners are heat-sealed to the inside of the open end of the strip so as to protrude beyond the open end.Claims 7 to 3
A method for manufacturing a bag having a transparent part according to any one of Item 0.