JP2001192040A - Nonwoven fabric bag and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a bag made of nonwoven fabric by welding, wherein the bag has gussets and spreading of ends of the gussets is not limited. SOLUTION: A nonwoven fabric sheet is folded in two, and both side rims are welded. Both side rims are folded and welded to lower rims. The bag is turned inside out to provide a bag including side gussets 11. When the side gusset 11 is extended to a lower end, a part of the lower end of the side gusset overlaps a base, and its end rim is welded to an end rim of the base. Thus the nonwoven fabric bag having a flat base and side gussets is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag such as a handbag using a nonwoven fabric.

[0002]

2. Description of the Related Art In addition to paper, cloth, plastic, polyvinyl chloride and the like, non-woven fabrics may be used as materials for bags such as handbags. This nonwoven fabric has excellent heat retention and air permeability, and can be dyed in a variety of colors, and can print and draw marks, characters, large complex patterns, and the like. In addition, nonwoven fabrics made of synthetic fibers of thermoplastic resins such as olefins such as polypropylene and polyethylene and polyamides have welding properties and can be processed at low cost. Furthermore, non-woven fabrics are often used as substitutes for the above-mentioned materials because of their high-class appearance and good texture.

[0003] In the case of manufacturing a bag made of a synthetic resin film such as polyvinyl chloride, the bag is formed by inflating a tubular film by applying air pressure, providing a horizontal gusset, fusing the bottom portion and welding. Can be formed. However, in the case of manufacturing a nonwoven fabric bag, since the nonwoven fabric has good air permeability, air pressure cannot be applied to the inside thereof, and the nonwoven fabric cannot be manufactured in the same manner as a synthetic resin film bag. Further, since the ordinary nonwoven fabric is provided as a roll, only a sheet-shaped nonwoven fabric can be obtained.
For this reason, nonwoven bags have been manufactured by folding and welding nonwoven sheets.

By the way, in a bag such as a handbag, there is a case where a gusset portion which is a W-shaped folded back is provided on a side surface or a bottom surface of a bag-shaped nonwoven fabric sheet. By providing the side gusset on the side surface of the bag, it is possible to reduce the size of the bag when folded, as compared to a bag without the side gusset having the same opening area.

[0005] Here, the nonwoven fabric sheet is folded back into a W shape,
By welding both side edges, a bottom gusset can be provided on the bottom surface of the bag. In addition, if it is manufactured by sewing, the horizontal gusset and the bottom gusset can be provided, but the production is troublesome and the cost is high. Therefore, it is desirable that the nonwoven fabric bag is manufactured by welding.

[0006]

As described above, a nonwoven fabric bag provided with a horizontal gusset or a bottom gusset by folding and welding a nonwoven fabric sheet is provided. However, in a nonwoven fabric bag made by a conventional manufacturing method, only one of the bottom gusset and the horizontal gusset is provided.

[0007] A bag made of only horizontal gussets has a sharply narrow bottom, so that it is difficult to stably hold the stored items and is not suitable for storing the stored items in an orderly manner. In particular, when a relatively flat object is stored, sitting of the stored item becomes worse. On the other hand, in the case of a bag with only the bottom gusset, when a thick thing is put, the expansion of both ends of the bottom gusset is restricted by the side surface of the bag, so that the space at the bottom of the bag cannot be fully utilized.

[0008] As described above, the conventional nonwoven fabric bag manufactured by welding the nonwoven fabric sheet has advantages and disadvantages. Therefore, an object of the present invention is to provide a nonwoven fabric bag that can sufficiently utilize a space formed by a bottom portion while providing a horizontal gusset.

[0009]

In order to achieve the above-mentioned object, a nonwoven fabric bag according to the present invention is obtained by folding a nonwoven fabric sheet in two and overlapping the two, and welding both side edges of the overlapped sheet to form a welded portion. The lower edge is closed and the upper edge is opened and formed into a bag shape, the both edges are bent toward the center, the lower edge is welded, and then the inverted portion is turned over to form a horizontal gusset portion in which the welded portion becomes a valley. The horizontal gusset is expanded to flatten the lower edge, and this is used as the bottom. At this time, a lower portion of the horizontal gusset is folded inward to form an overlapping portion overlapping the bottom,
It was manufactured by welding the polymerized portion to the bottom.

Since the bottom of this bag is flat regardless of the opening and closing of the horizontal gusset, the spread of the horizontal gusset is not restricted by the bottom even when stored items are stored, so that the space at the bottom of the bag is sufficient. Can be used for

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a nonwoven fabric bag, and FIG. 2 is a front view, a plan view, and a side view thereof.

This non-woven fabric bag is a non-woven fabric bag which is formed by folding the non-woven fabric sheet 1 in two and superimposing, welding both side edges of the superimposed sheets to form a welded portion, and folding the non-woven fabric sheet 1 around the welded portion. The formed horizontal gusset and the flat bottom 1
0, a lower portion of the horizontal gusset portion is folded and overlapped on the bottom portion 10 to form an overlapping portion 15.
The overlapping portion 15 is welded to the bottom 10 so as to close the opening 14 between the bottom 5 and the bottom 10. In addition, although the hand 20 is provided, a bag without the hand 20 may be used. Alternatively, a hole may be formed near the upper part of the bag so that the bag can be held by hand.

Next, a method of manufacturing the above bag will be described. First, as shown in FIG. 3, a disc-shaped plate 2 is pressed against the center of a nonwoven sheet 1 having a predetermined width wound in a roll shape to form a first folded edge 3, and the nonwoven sheet 1 is folded in two. . Then, as shown in FIG. 4, the folded nonwoven fabric sheet 4 is cut to a required width. Further, as shown in FIG. 5, a first-stage bag having first welding lines 5 on both side edges, the upper edge being open, and the lower first folding edge 3 being closed is formed. When a nonwoven fabric made of synthetic fibers of thermoplastic resin such as olefin or polyamide such as polypropylene or polyethylene is used, sufficient welding property can be secured. Further, as a welding method, an ultrasonic wave or a heat welding may be used, and the ultrasonic welding does not damage the material as compared with the heat welding.

Next, as shown in FIGS. 6 to 8, both side edges of the bag at the first stage are folded to form second folded edges 6. Then, the portion that is overlapped by the folding of the lower edge is welded along the first folded edge 3 to form a second-stage bag having the second welded line 7 with both side edges folded. Here, when both side edges are folded, a folding line is formed by sandwiching between the rollers. At this time, the width of the turn 9 is
The width of the turn 9 is determined according to the predetermined thickness of the bag. Since the folded portions 9 on both sides overlap each other, the width of the folded portion 9 cannot be set to １ ／ or more of the entire width.

Then, by turning the bag of the second stage upside down, a bag of the third stage having the lateral gusset 8 on the side surface is obtained. The bag may be turned over manually or by using a machine. 9 and 10 show the third stage bag in a folded state and an expanded state, respectively. The lower end of the horizontal gusset 8 is welded to the first folded edge 3 by the second welding line 7, and the first welding line 5 becomes the bottom of the valley, so that the upper end side can be expanded.

FIG. 1 shows a state in which a bottom 10 is formed in a third stage bag to form a rectangular parallelepiped bag as a fourth stage bag.
1 and shown in FIG. Here, to form the bottom 10,
What is necessary is just to push and expand a horizontal gusset part, and the shaping | molding die 11 made of wood etc. is inserted in a bag. As the horizontal gusset 8 is expanded toward the lower edge, the valleys of the horizontal gusset 8 are flattened and bent at the points where the corners of the mold abut, thereby forming a bent edge 12. Furthermore, both ends of the bent edge 12 and the inner end of the second welding wire 7 are connected and bent to form the third folded edge 13. As a result, a triangular overlapping portion 1 is provided below the horizontal gusset.
5 is formed, and an opening 14 is formed below the overlapping portion 15.

Then, as the shaping mold 11 is inserted, the overlapping portion 15 descends, and when the overlapping portion 15 contacts the second welding wire 7, the opening 14 is closed and a flat surface is formed. This becomes the bottom portion 10 and can form a rectangular parallelepiped bag as the fourth stage bag.

In this state, the overlapping portion 15 overlaps the bottom portion 10, but as shown in FIG. 13 (a), since the bent edge 12 and the edge of the bottom portion 10 are not joined, the opening 14 appears. Then, the shape of the bag returns to the third stage bag having only the horizontal gusset 8.

Therefore, as shown in FIG. 13 (b), when the bent edge 12 which is the edge of the overlapping portion 15 and the edge of the bottom portion 10 are welded, the opening 14 is closed and the fourth stage bag is closed. Can be prevented from returning to the third stage bag, and the four corners of the bottom 10 can be shaped neatly. At this time, since the overlapping portion 15 overlaps with the bottom portion 10, it may be welded at an arbitrary position. However, if the edges are welded as described above, the work can be efficiently performed, and at least three points at the center and both ends are provided. Third weld 16
The purpose of closing the opening 14 and shaping the four corners of the bottom 10 neatly can be achieved by providing.

The bag manufactured as described above has a bottom 1
0 is flat, and the stored items can be stably held by fully utilizing the space of the bottom portion 10 of the bag. In addition, the overlapping portion 15 serves to reinforce both sides of the bottom portion 10 so that it is hard to lose its shape and has a good appearance. And by putting the bottom of the cardboard or the like in the bottom part 10, even heavy objects can be stored. In addition,
Before welding the opening 14 below the overlapping portion 15, a triangular cardboard or the like may be inserted and reinforced.

FIGS. 14 to 16 show how the bag is folded.
Shown in First, a fold 17 that is convex outward on the horizontal gusset
Are provided, and folds 18 that are convex inward are provided on the front and back sides. Further, a fold 18 that is convex inward is provided so as to connect the center of the fold 17 and the corner of the bottom. Note that FIG.
As shown in the figure, the valley portion of the horizontal gusset 8 is also the first welding line 5, and the welded portion is formed inside the bag. Then, when the valley of the horizontal gusset 8 is folded so as to be convex outward, the nonwoven fabric having increased rigidity due to welding is folded back, so that the valley of the horizontal gusset 8 is naturally convex inward.

When the bag is folded along the fold, FIG.
As shown in FIG. 7, the rectangular parallelepiped bag can be folded in a T-shape.
Further, as shown in FIG. 16, by folding the bottom 10 along the crease, the rectangular parallelepiped bag can be folded flat. After that, if the entire bag is folded in half, it can be compactly packed, bulky and portable.

FIGS. 18 to 22 show another embodiment.
First, the lower edge of the first stage bag is folded to form the second folded edge 6. Then, the overlapped portion is welded along the side edges by folding, and the lower edge is folded to form a second stage bag having the second welding line 7. By this folding, the bottom gusset 19 is formed, and the width thereof is の of the width of the bottom gusset 19, so the width of the folding 9 is determined according to the thickness of the bag. It should be noted that the width of the turn 9 cannot be more than 1/2 of the overall height. In addition, since the width of the bottom gusset 19 cannot be made larger than the entire width, the width of the folded back 9 cannot be set to １ ／ or more of the entire width.

Then, by turning the bag of the second stage upside down, a bag of the third stage having the bottom gusset 19 on the bottom 10 as shown in FIG. 20 is obtained. When the bottom gusset 19 of the bag is extended to both side edges, a rectangular parallelepiped bag as a fourth stage bag can be formed.

As shown in FIG. 21, the bags in the fourth stage include:
An overlapping portion 15 is formed at a side end of the bottom portion 10. Therefore, the overlapping portion 15 is welded to the side portion to prevent the fourth stage bag from returning to the third stage bag and to form the lower end of the side surface neatly.

The bag is provided with a bottom gusset 19, and the first welding line 5 at the center of the side is formed inside the bag, so that the side gusset 8 is naturally formed on the side. Therefore, this bag is provided with the horizontal gusset 8 together with the bottom gusset 19, and even when storing items, the spread of the bottom gusset 19 is not restricted by both side edges, so that the space of the bottom 10 of the bag is sufficiently used. can do.

FIG. 22 shows how the bag is folded.
When the bottom portion 10 of the bag is folded inward along the first folded edge 3 at the center, the side portions are also folded inward, so that the rectangular parallelepiped bag can be folded flat.

[0028]

As is apparent from the above description, the nonwoven fabric bag according to the present invention can secure a flat bottom because the expansion of the end of the gusset is not restricted, and makes full use of the space created thereby. Can be. Therefore, the stored items can be stored neatly, and the shape of the bag can be prevented. Further, by manufacturing by welding, the working time can be reduced and labor can be saved, so that a bag can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a nonwoven fabric bag of the present invention.

FIG. 2A is a front view of the nonwoven fabric bag of the present invention, and FIG.
Is a plan view of the nonwoven fabric bag of the present invention, and (c) is a side view of the nonwoven fabric bag of the present invention.

FIG. 3 is a diagram showing a process of folding a nonwoven fabric sheet in two.

FIG. 4 is a view showing a process of cutting a nonwoven fabric sheet.

FIG. 5 is a perspective view of a first stage bag.

FIG. 6 is a diagram showing a bag manufacturing process in a second stage.

FIG. 7 is a diagram showing a bag manufacturing process in a second stage.

FIG. 8 is a diagram showing a bag manufacturing process in a second stage.

9A is a front view of the third stage bag, FIG. 9B is a sectional view taken along line AA, and FIG. 9C is a sectional view taken along line BB.

FIG. 10 is a perspective view of a third stage bag in an open state.

FIG. 11 is a diagram showing a bag manufacturing process in a fourth stage.

12 (a) is a front view of the bag at the fourth stage, (b) is a sectional view taken along line AA, (c) is a sectional view taken along line BB, (d) is a sectional view taken along line CC, (E) is a DD sectional view thereof.

FIG. 13 (a) is a view showing a fourth stage bag before welding,
(B) is a diagram showing a fourth-stage bag after welding.

FIG. 14 shows a fold of a bag.

FIG. 15 is a diagram showing a process of folding a bag.

FIG. 16 shows the bag in a folded state.

FIG. 17 is a cross-sectional view of a horizontal gusset.

FIG. 18 is a view showing a manufacturing process of a nonwoven fabric bag of another embodiment.

FIG. 19 is a view showing a manufacturing process of the bag.

FIG. 20 is a view showing the same bag manufacturing process.

FIG. 21 (a) is a front view of a fourth stage bag of another embodiment,
(B) is an AA sectional view, (c) is a BB sectional view, (d) is a CC sectional view, and (e) is a DD sectional view thereof.

22A is a view showing a fold of a bag, and FIG. 22B is a view showing a state when the bag is folded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nonwoven fabric sheet 2 Disc-shaped plate 3 First folded edge 4 Nonwoven fabric sheet folded in two 5 First welding line 6 Second folded edge 7 Second welding line 8 Lateral gusset 9 Folding 10 Bottom 11 Shaping mold 12 Folding Edge 13 Third folded edge 14 Opening 15 Overlap portion 16 Third welded portion 17 Folded outwardly convex 18 Folded inwardly convex 19 Bottom gusset 20

Claims (2)

[Claims] 1. A nonwoven fabric bag which is formed by folding a nonwoven sheet into two and overlapping, and welding both side edges of the overlapped sheet to form a welded portion, wherein the lateral gusset is formed by folding around the welded portion. Part, a flat bottom part, a lower part of the horizontal gusset part is folded to form an overlap part that overlaps with the bottom part, and the overlap part is welded to the bottom so as to close the opening between the overlap part and the bottom part A nonwoven bag made of non-woven fabric. 2. A non-woven fabric sheet is folded in two and overlapped, and both side edges of the overlapped sheet are welded to form a welded portion, the lower edge is closed and the upper edge is opened to form a bag, and the both edges are centered. Bending toward the bottom, the lower edge is welded, and then turned over to form a horizontal gusset where the welded portion becomes a valley, the horizontal gusset is expanded and the lower edge is flattened, and this is used as the bottom. A method for producing a nonwoven fabric bag, characterized in that a lower portion of the horizontal gusset is folded inward to form a polymerized portion overlapping the bottom portion, and the polymerized portion is welded to the bottom portion.