JP2001097398A - Air-permeable bag and method of manufacturing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve, relating to an air-permeable bag such as a net bag for packaging an object to be packaged such as perishable food which requires air permeability and a method for manufacturing the bag, such problems that the bag cannot be easily folded, a swell or deformation occurs on a folded part, deformation or distortion occurs on side end rims and a commercial product value after manufacture is deteriorated. SOLUTION: A bag body 1 comprises two air-permeable sheets as a surface and a rear face which are connected with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas permeable bag and a method for producing the gas permeable bag, and more particularly, to a gas permeable bag such as a net bag for packaging objects to be wrapped, such as fresh food, which require gas permeability. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Generally, a net bag made of a synthetic resin net is used as this kind of breathable bag.

[0003] Such a breathable bag is formed by folding one long synthetic resin net-like sheet into two parts, forming the folded part as a bottom part, and heat sealing at a predetermined position. It is manufactured by cutting the sealed position.

As shown in FIG. 49, the air-permeable bag manufactured by this method has a folded portion formed as a bottom portion 22 and both side edges are heat-welded to form a bag body 21. A header 24 made of a synthetic resin film also serving as a sealing piece is attached so that one piece 21a of the bag body 21 is extended from the other opening 21b from the opening 23 in the upper part of the bag 21.

[0005]

However, since a long synthetic resin net-like sheet is folded in two, when the long synthetic resin net-like sheet is transferred or half-folded, There has been a problem that a tensile force or a bending force is inadvertently generated and the bag body may be deformed.

Further, since the net-like sheet is half-folded, it cannot be easily bent, and the bent portion, ie, the bottom of the bag body 21 is not provided.
22 was liable to be distorted or swollen.

[0007] Furthermore, both sides of the bag body are manufactured by heat sealing as described above. However, if the bottom of the bag body is distorted or bulged, the side edges are also distorted or deformed. As a result, there is a problem that the finish of the side edge is deteriorated.

[0008] In particular, when the finish of the side edge is deteriorated, the commercial value is remarkably reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve all of the above problems, and has various problems based on the conventional folding process, namely, the difficulty in performing folding, and the inflating of the folded portion. It is an object of the present invention to solve problems such as the appearance of deformation and deformation, the occurrence of deformation and distortion at side edges, and the loss of commercial value after production.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has been made as a breathable bag and a method of manufacturing the same.
Is formed by connecting the front and back air-permeable sheets.

The connection between the front and back air-permeable sheets is performed by, for example, welding both side edges and the bottom edge of the front and back air-permeable sheets.

[0012] Further, as the front and back two breathable sheets,
For example, a mesh sheet made of synthetic resin is used.

Further, of the two front and back air-permeable sheets,
It is also possible to provide a synthetic resin header 4 on one of the breathable sheets.

A feature of the method for producing a gas permeable bag is that two long gas permeable sheets 9 and 10 are polymerized, blown at a predetermined position, or cut after welding.

Fusing or welding of the polymerized air-permeable sheets 9 and 10 at predetermined positions is performed by, for example, heat fusing or heat fusing, or ultrasonic fusing or ultrasonic fusing.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

First, the configuration of a breathable bag as one embodiment will be described.

In FIGS. 1 to 4, reference numeral 1 denotes a bag body made of a synthetic resin net (net).
Three sides of both side edges 2a, 2b and bottom edge 2c of a, 1b are heat-welded to form a bag.

The bag body 1 has both side edges 2a, 2b and a bottom edge.
The welding of 2c is formed in a sealed state having a predetermined width.

An opening 3 is formed in the upper portion of the bag body 1 which is not welded.

Further, a header 4 made of a synthetic resin film is provided above the piece 1a of the bag body 1.

The synthetic resin film constituting the header 4 is made of the same material as the mesh material constituting the bag body 1, for example, if the bag body 1 is a polypropylene net.
The header 4 is made of a polypropylene film.

The header 4 is a piece 1a of the bag body 1.
Is formed to extend from the upper side to the opening 3 above the other piece 1b, and also has a function as a sealing piece.

A release material 6 is provided on one side of the header 4, which also serves as a sealing piece, via an adhesive 5.

A belt-like film 7 is adhered to the upper portion of the other side 1b of the bag body 1.

The strip film 7 is provided at a position where the adhesive 5 on one side of the header 4 is bonded when the header 4 is bent toward the other piece 1b of the bag body 1.

Then, a breathable bag having such a configuration
When using 13, as shown in FIG. 5, the article to be packaged 8 is stored in the bag body 1, and then the release material 6 is peeled off.
The header 4 is bent toward the other piece 1b side of the bag body 1, and the adhesive 5
The header 4 is adhered to the belt-like film 7 via the.

In this way, the article to be packaged 8 is packaged in a breathable bag.

Next, a breathable bag having the above-described structure.
A method for manufacturing 13 will be described.

First, as shown in FIGS. 6 and 7, four long net-like sheets 9, 9, 10, 10 are prepared.

These net-like sheets 9 and 10 have a width in the short direction substantially equal to the length of the bag, and are formed of a net made of biaxially oriented polypropylene.

Next, such four net-like sheets 9,
7, two mesh sheets 9, 9 are arranged on the upper side, and two mesh sheets 10, 10 are arranged on the lower side, as shown in FIG. 9,1
Transfer 0,10.

Next, as shown in FIGS. 8 and 9, the synthetic resin header forming sheet 11 is conveyed, and both sides of the header forming sheet 11 are divided into two lower mesh sheets. Weld to 10,10 respectively.

In this case, a release material 6 is provided in advance at substantially the center of the header forming sheet 11 with an adhesive 5 interposed therebetween.

As shown in the figure, the two belt-like film forming sheets 12 and 12 are also transported in the same manner, and are respectively welded to the two divided upper net-like sheets 9 and 9.

Next, as shown in FIGS. 10 and 11, the center of the header forming sheet 11 is cut off, and the end portions of the upper net-like sheets 9, 9 and the lower net-like sheets 10, 10 are cut. Is welded.

Next, the upper mesh sheet 9 and the lower mesh sheet 10 welded at the ends are welded at regular intervals in the direction intersecting the transport direction, and the welding positions are shown in FIG.
Cut as shown.

Thus, the breathable bags 13,... As shown in FIGS. 1 to 4 are continuously manufactured.

In the present embodiment, since the air-permeable bag 13 is manufactured by joining the two net-like sheets 9 and 10 as described above, the folding step is unnecessary as in the conventional case, and therefore, the bag body is not required. It has been possible to solve problems such as distortion of the side edge and bottom edge of No. 1.

In the above embodiment, two net-like sheets 9, 9, 10, and 10 are arranged and transferred on the upper side and the lower side. However, the present invention is not limited to this, and as shown in FIGS. 13 and 14, for example. Then, the net-like sheets 9, 10 having a width of two bags equal to the length of the bag to be manufactured are arranged one above the other, and cut at a substantially central position to remove the cut portion. FIG.
And two net-like sheets 9, 9, 1 as shown in FIG.
It is also possible to form 0,10.

In this case, after cutting at a substantially central position, a bag is manufactured in the same steps as in FIGS.

In the above embodiment, the header forming sheet 11 is centered, that is, the divided net-like sheets 10 and 10 are separated.
However, the position at which the header forming sheet 11 is transferred is not limited to this.
As shown in FIG. 15, it may be transferred to both sides of the mesh sheet 10 and welded.

In this case, as shown in FIG. 16, the upper and lower mesh sheets 9 and 10 are cut at substantially the center, and the cut edges are welded as shown in FIG. The net-like sheets 9 and 10 are obtained.

As in the above embodiment, a gas permeable bag can be obtained by welding at equal intervals in a direction intersecting the transport direction and cutting the welding position.

In the above embodiment, the header 4 is provided only on one side of the bag body 1, but it is also possible to provide the header 4 on both sides.

As an example of a method for manufacturing such a breathable bag, as shown in FIG. 18, for example, the net-like sheets 9, 10 are transferred up and down, and the header forming sheet 11 is transferred to a substantially central position thereof. After welding, as shown in FIG. 19, cut the approximate center of the header forming sheet 11,
Further, by welding the cut edges as shown in FIG. 20, upper and lower welded net-like sheets 9 and 10 are obtained. A plastic bag is produced.

Further, the sealing piece forming sheets 14, 14 are transferred and welded to the end portions of the lower mesh sheets 10, 10.

The breathable bag 13 thus manufactured is
As shown in FIG. 21, a header 4 is provided on the upper part of the bag body 1.

As shown in the figure, the header 4 is provided on each of the two pieces 1a and 1b of the bag body 1, and is welded at the tops of the headers 4 and 4 on both sides.

A sealing piece 15 is provided below the opening 3 on the side of the lower piece 1a of the bag body 1.

In this embodiment, the opening 3 is provided in the lower part of the bag body 1 as shown in FIG.

FIG. 22 shows an example of a method of manufacturing another breathable bag 13 in which the headers 4 are arranged on both sides of the bag body 1.
As shown in the figure, the net-like sheets 9 and 10 are transported up and down, and the header forming sheets are respectively provided at positions on both sides thereof.
After transferring and welding 11, as shown in FIG. 23, approximately the center of each of the mesh sheets 9 and 10 is cut, and after welding as shown in FIG. 24, the direction intersecting with the transfer direction is set at regular intervals. Welding,
By cutting, the breathable bag 13 as shown in FIG. 25 is manufactured.

The breathable bag 13 thus manufactured is
As shown in the drawing, the same size header 4 is provided on both upper parts 1a and 1b of the bag body 1, but the opening 3 is also provided in the bag body 1.
The opening 3 is closed when the headers 4 and 4 are bonded to each other with an adhesive 5 therebetween.

In the embodiment shown in FIGS. 22 to 25, the case in which the header forming sheet 11 is transferred to both sides of the mesh sheets 9 and 10 and welded is described. As shown in FIG. 28, a bag having the same form as the breathable bag 13 shown in FIG. 25 can also be manufactured by transferring to the center side and welding.

That is, as shown in FIG. 26, the net-like sheets 9 and 10 are transported up and down, and the header-forming sheet 11 is transported and welded to the center of each of the net-like sheets 9 and 10, As shown in FIG. 27, a substantially central portion of the release material 6 is cut, and the cut edges are welded as shown in FIG. 28 to form a breathable bag as shown in FIG.
It becomes possible to manufacture 13.

In the above embodiment, polypropylene is used as the net-like sheet (net) constituting the bag body 1 and the film forming the header 4, but the material of these nets and films is limited to polypropylene. Instead, for example, a material such as polyethylene can be used.

Furthermore, other synthetic resins can be used, and materials other than synthetic resins can also be used.

As the film forming the header 4, a composite film in which two layers of synthetic resin are coated or laminated to increase the strength can be used.

Further, in each of the above embodiments, a net-like sheet (net) made of synthetic resin is used as the material of the bag body 1, but the material of the bag body 1 is not limited to this. It is also possible to use a net made of synthetic resin that is wider and flatter than the so-called net, and it is also possible to use a nonwoven fabric.

It is also possible to use a gas permeable film.

As the gas permeable film, for example, a film whose surface is subjected to fine unevenness processing is used.

In addition, such a gas-permeable film has
It is also possible to apply anti-fog processing called anti-fog processing.

When such a gas permeable film is used, one piece 1a of the bag body 1 may be formed of a gas permeable film and the other piece 1b may be formed of a net as shown in FIG.

In this case, as shown in FIG. 30, a long gas permeable film 17 having an adhesive 5 and a release material 6 adhered to substantially the center thereof is transferred, and the same as in FIGS. The bag as shown in FIG. 29 is manufactured through the steps of cutting, welding and the like.

In any case, the material of the bag body 1 only needs to be a breathable material.

Further, in the above-described embodiment, the air-permeable bag is manufactured by cutting the net-like sheets 9 and 10 and then welding them. However, it is also possible to manufacture the air-permeable bags by welding and then cutting them. Further, it is also possible to cut the sheet at the same time as welding, as in the case of a heat-sealing seal.

Further, in the above embodiment, the bag length 2
Although the bag is manufactured by transferring the net-like sheet having a width equal to that of the bag, the bag may be manufactured by transferring the net-like sheet having a width of one or more than three lengths in the longitudinal direction of the bag.

In the case of using one net-like sheet in the bag length direction, a net-like sheet slightly longer than the finished size is prepared, overlapped, welded and sealed. The bag is manufactured by cutting the edge portion.

As shown in FIG. 3, the form of the breathable bag is such that a header 4 is provided only on one piece 1a side of the bag body, and as shown in FIG. , A sealing piece 15 is provided, and a bag having headers 4 and 4 on which two films are welded on the top, or as shown in FIG.
Any type, such as those having the same size headers 4 and 4, may be used.

In each of the above embodiments, the header 4 is provided on the bag main body 1. However, providing such a header 4 is not an essential condition of the present invention.

For example, as shown in FIGS. 31 and 32, the structure may be such that the display film 16 is attached in the vertical direction at the center of the bag body 1.

In this case, too, one piece 1a and the other piece 1b of the bag body 1 are used.
Is composed of a separate net-like sheet, and three sides are sealed.

When such a bag is manufactured, a long display film forming sheet is transported together with the long net-like sheet, and is manufactured through a cutting and welding process. This makes it suitable for automatic packaging.

Furthermore, in the embodiment of FIGS. 31 and 32, the display film 16 is attached in the vertical direction, but may be attached in the horizontal direction as shown in FIGS. 33 and 34.

As shown in FIG. 35, for example, the bags shown in FIGS. 33 and 34 are transported by attaching net-like sheets 10, 10 on both sides of a display film forming sheet 18 and holding the net-like sheets 9, 9 on the upper side thereof. Is placed and transported, and then, as shown in FIG. 36, the central portion of the display film forming sheet 18 is cut so that the display film 16 remains on the net-like sheets 10 and 10,
Thereafter, the upper mesh sheet 9, 9 and the lower mesh sheet 1
0, 10 and are welded and cut at regular intervals in the direction intersecting the transport direction of the upper mesh sheet 9 and the lower mesh sheet 10 at regular intervals. is there.

In this case, the display film 16 can be attached to the upper portion of the bag as shown in FIGS. 33 and 34, or can be attached to the center of the bag as shown in FIG. It is also possible to attach to the lower part of the bag as shown in 38.

In any case, the form of the bag does not matter, and a bag other than the above embodiments may be used.
For example, a bag that does not have the header or the display film of the above-described embodiment and is simply composed of two nets can be included in the scope of the present invention.

In this case, as shown in FIG. 39, one piece 1a of the bag body 1 may be formed of a gas permeable film, and the other piece 1b may be formed of a net.

In such a bag, for example, as shown in FIG. 40, the gas-permeable film 17 is transferred, and at the same time, the net-like sheets 9, 9 are transferred to the upper side thereof. Then, as shown in FIG. The film 17 is manufactured by cutting the central portion of the film 17, welding the net-like sheets 9, 9 and the end portions of the gas-permeable film 17, and welding and cutting the direction intersecting the transfer direction of both at equal intervals. Things.

Further, in the embodiment shown in FIG. 20 and the like, the adhesive 5 and the release material 6 are provided on the header 4 side.

Further, the sealing may be performed by means of an adhesive tape or the like without applying the adhesive.

Further, in the above embodiment, one piece 1a and the other piece 1b of the bag body 1 are welded at the bottom edge 2c. However, it is not always necessary to weld at the bottom edge 2c. (One side or the other side of the bag body) may be welded.

A bag as shown in FIGS. 42 and 43 is exemplified as such a bag.

In the bag shown in FIG. 42, the lower end of one piece 1a of the bag body made of a gas-permeable film is slightly bent toward the other piece 1b of the net, and the lower end 19 of the one piece 1a is connected to the lower end 20 of the other piece 1b. Is formed by welding.

In FIG. 42, reference numeral 6 denotes a release material provided with the adhesive 5 interposed therebetween.

Reference numeral 7 denotes a sealing piece 4 on the side 1a of the bag body.
This is a band-shaped film for adhering to the bag body, and is provided on the upper portion of the other side 1b of the bag body.

As shown in FIG. 44, such a bag is slightly bent at both ends of the gas permeable film 17 and welded to the respective edges of the two net-like sheets 9, 9.
It is manufactured by cutting the approximate center of the portion where the release material 6 is provided.

In the bag shown in FIG. 43, the lower end 19 of one piece 1a of the bag body made of a net is slightly bent to the other piece 1b side made of a gas-permeable film, and the lower end 19 of the one piece 1a is connected to the other piece 1b. And is welded to the lower end 20 of the base.

In FIG. 43, reference numeral 4 denotes a header made of a synthetic resin film, which also serves as a sealing piece, and a release material 6 is provided via an adhesive 5.

As shown in FIG. 45, such a bag is made of mesh sheets 10, 1 welded to both sides of a header forming sheet 11.
0 is slightly bent so that the gas permeable film 17,
17 is welded to each of the edges, and is manufactured by cutting the approximate center of the header forming sheet 11 provided with the adhesive 5 and the release material 6.

Further, when manufacturing a bag in which one piece 1a of the bag body 1 is made of a gas-permeable film and the other piece 1b is made of a net as shown in FIG. 29, as shown in FIG. An adhesive 5 is provided at approximately the center of the long gas permeable film 17.
46, the adhesive 5 and the release material 6 are provided on both sides of the gas-permeable film 17 as shown in FIG.
Can be used.

Further, in each of the above embodiments, the one piece 1a and the other piece 1b of the bag body 1 are connected by welding or the like at the bottom. However, as shown in FIG. 1b
May be connected by welding or the like.

In such a bag, as shown in FIG. 47, mesh sheets 9 and 10 are welded to both sides of a header forming sheet 11, and a band film 7 is provided on one end side of one mesh sheet 9. The other net-like sheet 10 is manufactured by using an adhesive 5 and a release material 6 provided at the end.

Further, the means for connecting the one piece 1a and the other piece 1b of the bag body is not limited to the heat welding as in this embodiment, but may be ultrasonic welding.

When a net-like sheet (net) is used as the material of the bag body, the mesh shape is square,
The shape of the diamond, such as a diamond, a circle, an ellipse, and an oval, does not matter.

It is also possible to change the shape of the mesh of the mesh sheet between the piece 1a and the other piece 1b of the bag body. In this case, the two pieces 1a and 1b made of the mesh sheet having a different shape are used. Since the intersection portion when polymerized is larger than when both pieces 1a and 1b composed of the mesh sheet of the same shape are polymerized,
There is an effect that the sealing strength at the side edge and the like is improved accordingly.

[0097] Further, the type of the article to be packaged does not matter, such as foods that need to maintain freshness and foods other than foods.

[0098]

As described above, according to the present invention, a bag is formed by connecting two net sheets on the front and back, instead of folding and manufacturing one net sheet or the like as in the related art. Therefore, there are various problems associated with the folding operation that have conventionally occurred, namely, that bending cannot be easily performed, distortion or the like occurs at a bent portion, distortion or the like occurs at an edge, and manufacturing. It has become possible to solve various problems such as impairing the appearance afterwards.

In particular, as a result that bulging and deformation can be prevented from occurring at the bent portion, the portion serving as the side edge of the bag body is welded and cut or blown, so that the side edge as in the prior art is formed. There is no danger of extreme deformation and the like, and there is an effect that the finish of the side edge becomes significantly better than in the past.

Further, in the case of manufacturing using two sheets in the length direction of the bag, two bags are simultaneously manufactured for each width of the bag by welding or cutting at a predetermined position. Therefore, the production amount of bags per hour is doubled, and the production amount per hour is significantly increased as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a front view of a breathable bag as one embodiment.

FIG. 2 is a rear view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view showing a use state.

FIG. 6 is a plan view of the mesh sheet.

FIG. 7 is a cross-sectional view of a mesh sheet.

FIG. 8 is a plan view of a step of transferring and welding a sheet for forming a header.

FIG. 9 is a sectional view of the same.

FIG. 10 is a plan view of a cut net sheet.

FIG. 11 is a sectional view of the same.

FIG. 12 is a plan view showing a state in which a net sheet is cut at predetermined intervals to produce a bag.

FIG. 13 is a plan view of a mesh sheet according to another embodiment.

FIG. 14 is a sectional view of the same.

FIG. 15 is a cross-sectional view of a mesh sheet in a bag manufacturing method according to another embodiment.

FIG. 16 is a sectional view showing a step of cutting the mesh sheet.

FIG. 17 is a sectional view of a step of welding the edge of the mesh sheet.

FIG. 18 is a cross-sectional view of a mesh sheet in a bag manufacturing method according to still another embodiment.

FIG. 19 is a sectional view showing a step of cutting the net-like sheet.

FIG. 20 is a sectional view of a step of welding the edge of the mesh sheet.

FIG. 21 is a sectional view of a breathable bag after production.

FIG. 22 is a cross-sectional view of a mesh sheet in a bag manufacturing method according to still another embodiment.

FIG. 23 is a sectional view showing a step of cutting the net-like sheet.

FIG. 24 is a sectional view of a step of welding the edge of the mesh sheet.

FIG. 25 is a sectional view of the breathable bag after production.

FIG. 26 is a sectional view of a mesh sheet in a bag manufacturing method according to still another embodiment.

FIG. 27 is a sectional view showing a step of cutting the mesh sheet.

FIG. 28 is a sectional view of a step of welding the edge of the mesh sheet.

FIG. 29 is a cross-sectional view of another embodiment of a breathable bag.

FIG. 30 is a sectional view showing the manufacturing process of the bag of FIG. 29.

FIG. 31 is a front view of another embodiment of a breathable bag.

FIG. 32 is a sectional view taken along line CC of FIG. 31;

FIG. 33 is a front view of another embodiment of a breathable bag.

FIG. 34 is a sectional view taken along line DD of FIG. 33;

FIG. 35 is a sectional view showing a step of transferring the mesh sheet in the method of manufacturing the bag of FIG. 33.

FIG. 36 is a sectional view showing a cutting step of the display film forming sheet.

FIG. 37 is a front view of another embodiment of a breathable bag.

FIG. 38 is a cross-sectional view of another embodiment of a breathable bag.

FIG. 39 is a cross-sectional view of another embodiment of a breathable bag.

FIG. 40 is a cross-sectional view showing a step of transferring the mesh sheet in the method of manufacturing the bag of FIG. 39.

FIG. 41 is a sectional view showing a step of cutting the gas-permeable film.

FIG. 42 is a cross-sectional view of another embodiment of a breathable bag.

FIG. 43 is a cross-sectional view of another embodiment of a breathable bag.

FIG. 44 is a sectional view showing a manufacturing step of the bag of FIG. 42.

FIG. 45 is a sectional view showing a manufacturing step of the bag of FIG. 43.

FIG. 46 is a cross-sectional view showing a step of transferring a mesh sheet in a bag manufacturing method according to another embodiment.

FIG. 47 is a cross-sectional view showing a step of transferring a mesh sheet in the bag manufacturing method according to another embodiment.

FIG. 48 is a sectional view of a bag manufactured by the manufacturing method of FIG. 47;

FIG. 49 is a sectional view of a conventional bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bag body 1a ... One piece 1b ... Other piece 4 ... Header 9 ... Net-like sheet 10 ... Net-like sheet

Claims (6)

[Claims] 1. A breathable bag, wherein the bag body (1) is formed by connecting front and back two breathable sheets. 2. The breathable bag according to claim 1, wherein the bag body (1) is formed by welding both side edges and a bottom edge of two front and back breathable sheets. 3. The air-permeable bag according to claim 1, wherein the front and back two air-permeable sheets are net sheets made of synthetic resin. 4. The breathable bag according to claim 1, wherein a header (4) made of a synthetic resin is provided on one of the two breathable sheets. 5. A method for producing a breathable bag, comprising: polymerizing two long air-permeable sheets (9) and (10), and fusing at a predetermined position or cutting after welding. . 6. The ventilation according to claim 5, wherein the blowing or welding of the polymerized air-permeable sheets (9) and (10) at a predetermined position is performed by heat fusing or heat fusing, or ultrasonic fusing or ultrasonic fusing. Manufacturing method of plastic bags.