JPS58148749A - Manufacture of bag - 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 In the step of forming a cutting bar 7 oration on a sheet being pulled, first
drilling a second stepped perforation in parallel to the first stepped perforation at approximately the same position as the first perforation; A bag manufacturing method characterized in that the sheet is then cut along both par 7 orations to form a cylindrical bag unfolding sheet, and the unfolded sheet is folded into a cylindrical shape to further form a bottom patch. The purpose is to prevent separation lines from occurring at the cut portion of a rolled cloth sheet, form a good-looking bottom pasting part, and easily obtain a waste bag or a paper cloth pasted bag with good quality. 0 To explain the embodiment of the present invention shown in the drawings, the warp and warp strips 1.2 are made of a synthetic resin stretched tape, thereby forming a rolled plain woven fabric sheet 3, or the splits are made mutually as shown in FIG. A rolled up cloth sheet 3 is formed from 4.5 FC of crossed cloth. The sheet 3 may be laminated with a synthetic resin thin film, or it may be attached to a kraft paper 6 with an adhesive (see Fig. 3), or a composite sheet may be attached to a sandwich between the kraft papers 6 and 6. (Figure 4) is also acceptable. In the present invention, such a rolled cloth sheet 3 is pulled in the direction of arrow a and unwound, and the pulled sheet 3 is guided from a tension roller 7.7 to a receiving roller 8vc and rotated at a constant speed toward the same roller 8. A first perforation 10 can be formed in the sheet 3 bypassing the roller 8 by means of the perforation blade 9 . As shown in FIGS. 6 and 7, the parallel direction of the perforations 10 is perpendicular and oblique to the direction of the arrow a, and is formed in a step-like manner, not in a straight line. The above-mentioned pulling sheet 3 is further guided by a second receiving roller 8', bypassing the guide roller 1, and is guided by a perforation blade 9' rotating at a constant speed toward the loaf 8. A second perforation 12 is bored in the above-mentioned seam 3 which bypasses 8'. The position of the second perforation 12 is determined by the transfer speed of the sheet 3 and the perforation edge 9.
The first perforation [0] is drilled at almost the same position depending on the rotation timing with 9', and the direction and shape of both perforations 10 and 12 (step shape).
are matched. and both perforations】0.12
Then, the directions of the cuts are perpendicular to each other (Figures 7 to 1).
(Figure 1), or change the direction by 180 degrees (Figures 12 and 13)
), or they may be bored in a staggered manner as shown in FIG. In this way, two perforations 10 and 12 at approximately the same position formed at regular intervals are formed by the beating machine K.
l: Since it is cut by being beaten and becomes a cylindrical bag development sheet 13 of a certain length, it is folded in the longitudinal direction @ line 14.1
4 is folded and pasted into a cylindrical shape to form a cylindrical bag] 5 (Fig. 8), and an opening 17 is folded and pasted from the horizontal folding line 16 to form a bottom pasting part. .

Conventionally, when a rolled cloth sheet is cut in a straight line with a straight blade, the cut part is sharply cut by the straight blade and there is no possibility of loose stripes being generated, but when manufacturing bottom-lined bags by cutting in steps. It is necessary to form perforations and cut them into steps by pounding them. Then, during punch cutting, incompletely cut lines or warp lines due to perforation are loose from the cut edge (see Figure 8), and the same free lines 8 appear at the bottom sticking part by folding and pasting the cut part. The quality of the stickers was significantly compromised.

The present invention has been made in view of the above-mentioned defects, and since the present invention is based on the above-mentioned method, cloth sheet 3 (cloth sheet)
In mass production of step-cut bottom pasting bags, second step-like perforations 12 which are parallel to each other are bored at almost the same position as the first step-like perforation 0; perforation 10, I
2 is formed, the cross sheet 3 is reliably beaten and cut by the weft and warp strips 1.2 and the split fabric 4.5, and the striations are reliably cut by the hammer cutting, preventing the generation of loose striations 18 and making it possible to attach the cloth bottom. Bag quality and yield can be improved.

[Brief explanation of drawings]

Fig. 1 is a side view showing the bag manufacturing method of the present invention, Fig. 2 is a front view of the perforation blade, Fig. 3 is a longitudinal cross-sectional view of an embodiment of the cloth sheet, and Fig. 4 is a longitudinal cross-section of another embodiment. 5 is a plan view of the cloth, FIG. 6 is an example of perforations, FIG. 7 is an example of the perforations and the closure, FIG. 8 is a front view of the cylindrical bag, and FIGS. FIG. 10, FIG. 1, FIG. 12, FIG. 13, and FIG. 14 are enlarged views of perforation cuts, respectively. 3... Winding cloth sheet, a... Traction direction, 10, 12...
Staircase perforation, 13...Tubular bag development sheet, 1.2...Writing and warping, 4.5...Distributed cloth, 6...Kraft paper. Patent applicant Oishi Sangyo Co., Ltd. (7)

Claims (6)

[Claims] (1) In the process of unwinding the rolled fabric sheet 3 by pulling and forming cutting perforations on the sheet 3 being pulled, first step-like perforations 10 arranged in a direction intersecting the pulling direction a are bored. process and the first
A second stepped perforation 12 is bored in parallel to the first stepped perforation 10 at approximately the same position as the perforation 10, and then the sheet 3 is cut along the surface perforation 10.12 to form a cylindrical bag. A bag manufacturing method characterized by forming a spread sheet 13, folding the spread sheet 13 into a cylindrical shape, and forming a rough bottom patch. (2) The bag manufacturing method according to claim 1, wherein the rolled cloth sheet 3 is a plain weave sheet with warp and warp strips 1.2. (3) The bag manufacturing method according to claim 1, wherein the rolled cloth sheet 3 is a sheet made of split cloth 4.5. (4) The bag manufacturing method according to claim 1, wherein the rolled cloth sheet 3 is a composite sheet adhered to kraft paper 6. (5) Claim 1, wherein the rolled cloth sheet 3 is a sheet sandwiched between kraft paper 6.6.
The bag manufacturing method described in Koh. (6) The bag manufacturing method according to claim 1, wherein the cuts in both the perforations 10 and 12 are perpendicular to each other.