JP3343675B2 - Method of manufacturing gusseted packaging bag with open / close chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a packaging bag having a gusset and an opening which can be opened and closed by a chuck.

[0002]

2. Description of the Related Art A packing bag 1 as shown in FIGS. 1 to 3, that is, a gusset 4, 5 is provided between a front body 2 and a back body 3, and an opening / closing chuck 6 is attached near one end. A packaging bag 1 having a structure in which a front portion 2 in which the front body 2 and the rear body 3 are directly overlapped is provided outside the opening / closing chuck 6, and cutouts 8 serving as cutouts are provided on both side edges of the front portion 7 (note that the packaging bag 1 has a notch 8). , Packaging bag 1
Is opened for filling the contents, but will be closed after the filling of the contents is completed.) A conventional method for manufacturing the above will be described below with reference to FIG.

First, a series of long back body sheets 9 made of a thermoplastic resin are fed in the direction of the arrow in the figure. The back body sheet 9 is formed by laminating a resin film having a slightly lower melting temperature on one side of a base material sheet, and having the resin film having a slightly lower melting temperature on the upper surface side.
Next, the gusset sheet 10 made of a thermoplastic resin, which is folded in two so that both ends in the width direction are aligned at the center portion on the upper surface side, is sent orthogonally to the back body sheet 9 so that the back body sheet 9 is formed. Place on top. The gusset sheet 10 in the folded state is also formed by laminating a resin film having a slightly lower melting temperature on one side of the base sheet as described above. On the side. In this case, the leading end of the gusset sheet 10 does not reach one end in the width direction of the back body sheet 9.

Next, one of a pair of opening and closing chuck tapes 13 and 17 in which a groove 12 and a ridge 16 are integrally formed on the base sheet portions 11 and 15, respectively, is provided, for example, the groove 12. The opening / closing chuck tape 13 is placed on the back body sheet 9 and the gusset sheet 10. At this time, the opening / closing chuck tape 13 is orthogonal to the gusset sheet 10 and is overlapped on the end of the gusset sheet 10. The opening / closing chuck tapes 13 and 17 are also made of a thermoplastic resin. Then, the opening / closing chuck tape 13 is welded to the back body sheet 9 and the gusset sheet 10 at a melting temperature of a slightly lower melting temperature of the resin film laminated on the base sheet. At this time, the gusset sheet 10 in the folded state is welded only on the outer surface side, the upper part is welded to the opening / closing chuck tape 13, and the lower part is the back body sheet 9.
However, since the inner surface of the gusset sheet 10 is not welded, the separated state is maintained.

Next, the welded gusset sheet 10 is cut at the position of the other end in the width direction of the back body sheet 9,
The back body sheet 9 is moved by a certain distance, the gusset sheet 10 is again stacked on the back body sheet 9 and the opening / closing chuck tape 13 is placed on the gusset sheet 10 in the same manner as described above. Gusset sheet 10
Is repeated.

Next, on the back body sheet 9, gusset sheet 10, and opening / closing chuck tape 13, a series of long front body made of thermoplastic resin having the same width as the back body sheet 9 is provided. The sheets 14 are placed on top of each other. The front body sheet 14 is also obtained by laminating a resin film having a slightly lower melting temperature on one side of the base sheet as described above, but with the resin film having a slightly lower melting temperature on the lower surface side. I have. Further, in the vicinity of one end in the width direction on the lower surface of the front body sheet 14,
The other opening / closing zipper tape 17 is welded and placed so as to face the opening / closing zipper tape 13.

As described above, the back body sheet 9, the gusset sheet 10, the pair of opening / closing chuck tapes 13, 17 and the front body sheet 14 are overlapped, and the grooves in the pair of opening / closing chuck tapes 13, 17 are provided. After the protrusion 12 and the ridge 16 are fitted to each other, they are integrally welded. Also in this case, the back body sheet 9 and the gusset sheet 1
0, and heat welding is performed at a melting temperature of a slightly lower melting temperature of the resin film laminated on each base sheet of the front body sheet 14. In the drawing, reference numeral 18 indicates the welding position. That is, the central position of each foldable gusset sheet 10 that is positioned in parallel at regular intervals is welded in the longitudinal direction, and the front body sheet 14 and the back body sheet 9 are welded.
Is welded at one end in the width direction, that is, at a location corresponding to the tip of the ear 7 of the packaging bag 1. In this welding, 2
Only the outer surface side of each folded gusset sheet 10 is welded, and the inner surface side is not welded, and the separated state is maintained. Thereafter, the central position of the welding portion 18 in the gusset sheet 10 is cut in the longitudinal direction. At this time, the notches 8 are simultaneously formed on both sides of the portion corresponding to the ear 7. Thereby, the packaging bag 1 is completed. After filling the contents from the opening, the packaging bag 1 is sealed by welding the opening.

[0008]

In the above-mentioned conventional manufacturing method, when the gusset sheet 10 is fed and mounted on the back body sheet 9, the gusset sheet 10 is bent obliquely and easily displaced. There's a problem. Further, there is a problem that only one packaging bag 1 can be manufactured in the width direction of the back body sheet 9 and productivity is low.

[0009]

SUMMARY OF THE INVENTION Therefore, the present invention can prevent the gusset sheet from being bent obliquely and displaced when the gusset sheet is placed on the back body sheet. It is an object of the present invention to provide a manufacturing method that can manufacture two packaging bags in the width direction of a sheet and that has high productivity.

[0010]

In order to solve the above-mentioned problems, a method of manufacturing a gusseted wrapping bag provided with an opening / closing chuck according to the present invention enables a back body sheet 20 to be transported in a longitudinal direction and a width. The gusset sheet 21 folded so that both edges are located at the center position in the direction and folds are located at both ends in the width direction can be transported so as to be orthogonal to the back body sheet 20, and the gusset sheet 21 is After being cut to a length shorter than the width of the back body sheet 20, it is transported by the conveyor 26 to the center in the width direction of the back body sheet 20 and placed on the back body sheet 20. Sheet 20
, And the step of placing the cut gusset sheet 21 on the back body sheet 20 in the same manner as described above is repeated, and then a pair of openable / closable chuck tapes 29 and 33 that can be detached from each other. One is superimposed on both ends of the gusset sheet 21 so as to be orthogonal to the gusset sheet 21 and is welded to the gusset sheet 21 and the back body sheet 20. The front body sheet 30 welded to the lower surface side so as to face one of the opening / closing chuck tapes is superimposed on the back body sheet 20, and the widthwise central portion of the gusset sheet 21 sandwiched therebetween, The front body sheet 30, the gusset sheet 21, and the back body sheet 20 are integrally welded to both end portions or the center portion of the front body sheet 30 in the width direction, and thereafter, the welding portion 34 of the gusset sheet 21 is welded. And the center position, the front body sheet 30
At the center position in the width direction of the front body sheet 30,
A pair of opening and closing chuck tapes 29 and 33, a gusset sheet 21 and a back body sheet 20 are cut.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. First, as shown in FIG. 5, the back body sheet 20 can be transported in the direction of the arrow in the figure. The back body sheet 20 is made of a thermoplastic resin sheet, and has a two-layer structure in which a resin film having a slightly lower welding temperature is laminated on the upper surface side of the base sheet. The back body sheet 20 has the same width as the length of two longitudinally continuous packaging bags 1 to be manufactured.

The gusset sheet 21 can be transferred in a direction orthogonal to the transfer direction of the back body sheet 20. The gusset sheet 21 is made of the same material as the back body sheet 20, and has a structure in which a resin film having a slightly lower melting temperature than one side of the base sheet is similarly laminated. This gusset sheet 21 is, as shown in FIG.
Both edges in the width direction match at the center on the top side, and
The resin film having a low melting temperature is transported in a state of being folded so as to be exposed on the outer surface side. The gusset sheet 21 is sent out toward the back body sheet 20 by a pair of rollers 22 and 23, and its leading end is transferred to a conveyor 26 having a pair of belts 24 and 25 disposed on the back body sheet 20. Received. The conveyer 26 carries the gusset sheet 21 over the back body sheet 20 while sandwiching one end of the gusset sheet 21 in the width direction between the pair of belts 24 and 25 so that the gusset sheet 21 does not bend obliquely and displace. Become. The gusset sheet 21 is fed by a predetermined distance and then cut by the cutter 19. The length of the cut gusset sheet 21 is shorter than the width of the back body sheet 20 and equal to twice the length of the packaging bag 1 to be manufactured excluding the ears 7. After the gusset sheet 21 is cut, as shown in FIG. 7, the gusset sheet 21 is further fed to the center of the back body sheet 20 in the width direction by the conveyor 26 and placed on the back body sheet 20. You.

After the cut gusset sheet 21 is placed on the back body sheet 20, the back body sheet 20 is
Move the same distance as the width of the packaging bag 1 to be manufactured and stop,
Next, the gusset sheet 21 cut again is placed on the back body sheet 20 in the same manner as described above. Thereafter, this process is repeated, and as shown in FIG.
The gusset sheets 21 are arranged in parallel on the zero at a constant interval.

Next, as shown in FIG. 9, an opening / closing chuck tape 29 having a groove 28 in a base sheet portion 27 is placed on the back body sheet 20 and the gusset sheet 21 at right angles to the gusset sheet 21. So that it overlaps on both ends of the gusset sheet 21. This opening / closing chuck tape 29 is also made of a thermoplastic resin sheet. Then, the opening / closing chuck tape 29, the gusset sheet 21, and the back body sheet 20 are laminated at a melting temperature of a resin film having a slightly lower melting temperature by laminating the back body sheet 20 and the gusset sheet 21 on the base sheet. Weld together. At this time, only the outer surface of the gusset sheet 21 in the folded state is welded to the opening / closing chuck tape 29 and the back body sheet 20, but the inner surface is not welded and maintains the separated state.

Next, as shown in FIG. 10, the back body sheet 20, the gusset sheet 21, and the opening / closing chuck tape 29
A series of long front body sheets 30 made of the same material and having the same width as the back body sheet 20 are placed on the back. The front body sheet 30 is also formed by laminating a resin film having a slightly lower melting temperature on one side of the base sheet, but having the resin film having a slightly lower melting temperature on the lower surface side. In addition, the other opening / closing chuck tape 33 is welded and placed near the both ends in the width direction on the lower surface of the front body sheet 30 so as to face the opening / closing chuck tape 29. This opening / closing chuck tape 33
Are provided on the base sheet portion 31 with protrusions 32 which can be fitted and detached from the above-mentioned grooves 28.

As described above, the back body sheet 20, the gusset sheet 21, the pair of opening / closing chuck tapes 29 and 33 are provided.
(The grooves 28 and the ridges 32 are fitted to each other) and the front body sheet 30 is overlapped, and then they are integrally welded as shown in FIG. Also in this case, welding is performed at a melting temperature of a resin film having a slightly lower melting temperature laminated to the base sheet in the back body sheet 20, the gusset sheet 21, and the front body sheet 30. In the drawing, reference numeral 34 indicates the welding location. That is,
The central position in the width direction of each gusset sheet 21 positioned in parallel at a constant interval is welded in the longitudinal direction, and both end portions in the width direction of the front body sheet 30 and the back body sheet 20 (even at the center position in the width direction). (Possible) welding. Also at the time of welding, only the outer surface side of the folded gusset sheet 21 is welded, and the separated state is maintained without welding the inner surface side.

Next, as shown in FIG. 12, the central position of the welding portion 34 in the gusset sheet 21 is
1. Cut in the length direction. At this time, it is preferable to simultaneously form notches 8 (see FIG. 1) serving as cuts on both side edges of a portion corresponding to the ear 7. Further, as shown in FIG. 13, the widthwise central portions of the front body sheet 30 and the back body sheet 20 are cut. Thereby, two packaging bags 1 shown in FIGS. 1 to 3 are completed at the same time. In addition, after cutting the center position in the width direction of the front body sheet 30 and the back body sheet 20, each gusset sheet 21 is cut.
It is also possible to cut off the center position of.

[0018]

The present invention is as described above, and the conveyor 2
Since the gusset sheet 21 is guided to the correct position on the back body sheet 20 in step 6, the gusset sheet 21 does not bend obliquely and is displaced, so that no correction work or the like is required. After the gusset sheet 21 is cut into a predetermined length, the gusset sheet 21 is further conveyed by the conveyor 26.
To the center of the back body sheet 20 in the width direction, and then a pair of open / close zipper tapes 29 and 33
And the front body sheet 30 are overlapped and welded, and then the front body sheet 30 and the back body sheet 20 are cut at the center in the width direction, whereby two packaging bags 1 are simultaneously placed.
Can be produced, so that the effect of improving productivity can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a packaging bag to be manufactured.

FIG. 2 is a sectional view taken along line AA of FIG.

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

FIG. 4 is a perspective view showing a conventional manufacturing process.

FIG. 5 is a perspective view showing a step of feeding a gusset sheet on a back body sheet according to the embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a perspective view showing a step of carrying the cut gusset sheet to the center in the width direction of the back body sheet according to the embodiment of the present invention.

FIG. 8 is a perspective view showing a step of placing a gusset sheet at regular intervals on a back body sheet according to the embodiment of the present invention.

FIG. 9 is a perspective view showing a step of welding one opening / closing zipper tape on both ends of the gusset sheet on the back body sheet according to the embodiment of the present invention.

FIG. 10 is a perspective view, according to an embodiment of the present invention, showing a step of stacking a front body sheet on a back body sheet with a gusset sheet sandwiched therebetween.

FIG. 11 is a perspective view showing a state in which a front body sheet, a gusset sheet, and a back body sheet are welded according to the embodiment of the present invention.

FIG. 12 is a perspective view of a gusset sheet according to an embodiment of the present invention, showing a state where a central portion of the gusset sheet is cut off.

FIG. 13 is a perspective view of the front body sheet and the back body sheet according to the embodiment of the present invention, showing a state in which a central portion in a width direction of the front body sheet and the back body sheet is cut.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 packaging bag 2 front body 3 back body 4 gusset 5 gusset 6 opening / closing chuck 7 ear 8 notch 9 back body sheet 10 gusset sheet 11 base sheet part 12 groove 13 opening / closing zipper tape 14 front body sheet 15 base sheet Part 16 Ridge 17 Opening / closing chuck tape 18 Welding point 19 Cutter 20 Back body sheet 21 Depth sheet 22 Roller 23 Roller 24 Belt 25 Belt 26 Conveyor 27 Base sheet part 28 Groove 29 Opening / closing chuck tape 30 Front body sheet 31 Base sheet part 32 Ridge 33 Tape for opening and closing chuck 34 Welding point

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B31B 1/90 321 B31B 35/64 B31B 23/64 B65D 33/25

Claims (1)

(57) [Claims] 1. A gusset sheet 21 folded so that the back body sheet 20 can be transported in the longitudinal direction, and both edges are located at the center in the width direction and folds are located at both ends in the width direction. The gusset sheet 21 can be transferred so as to be orthogonal to the back body sheet 20 and the back body sheet 2
After being cut to a length shorter than the width of 0, the sheet is conveyed to the center in the width direction of the back body sheet 20 by the conveyor 26 and placed on the back body sheet 20, and thereafter, the back body sheet 20 is fixed. The step of placing the gusset sheet 21 cut in the same manner as described above on the back body sheet 20 after moving a distance is repeated, and then one of a pair of openable and closable chuck tapes 29 and 33 that can be detached from each other. Is overlapped on both ends thereof so as to be orthogonal to the gusset sheet 21 and the gusset sheet 2
The front body sheet 30 is welded to the back body sheet 1 and the back body sheet 20 and the other of the opening and closing chuck tapes 29 and 33 is welded to the lower surface side so as to face the above one opening and closing chuck tape. At the center in the width direction of the gusset sheet 21 that is superimposed on and sandwiched between the gusset sheets 20 and at both ends or the center of the front body sheet 30 in the width direction. Sheet 21 and the back body sheet 20 are integrally welded, and thereafter, the center position of the welding portion 34 of the gusset sheet 21 and the front body sheet 3
0 at the center position in the width direction of the front body sheet 3
0, a method of manufacturing a gusseted packaging bag provided with an open / close chuck, characterized by cutting the pair of open / close chuck tapes 29 and 33, the gusset sheet 21 and the back body sheet 20.