JPS634785B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a manufacturing device for a bag with strings, and more specifically, to a structure that prevents welding of a string and a bag body when forming a string insertion portion by welding. The present invention provides an apparatus for manufacturing a bag with strings.

[Prior art and its problems] A folded overlapping portion through which a string is inserted is provided on the front and back sides of the upper part of the bag body, and the folded overlapping portion is welded in the string insertion direction near the string to form the string insertion portion into a cylindrical shape. The formed bags with strings are well known, and the present inventor also filed a patent application in 1983.
No. 11993 (Japanese Unexamined Patent Publication No. 59-136238) and Patent Application Sho
No. 58-11994 (Japanese Unexamined Patent Publication No. 59-136239) discloses an apparatus for manufacturing such a bag with strings.

However, in these bags with strings, if the string insertion part is made too wide, it looks unsightly, so it is required to keep it to the minimum necessary. When the string is inserted, the string may spread in the longitudinal direction of the bag, and when the insertion portion is welded, a portion of the string may be welded to the film forming the bag. This tendency is particularly noticeable when a plurality of strings are inserted near the lower end of the folded overlapping portion and the folded overlapping portions are welded along the strings near both the top and bottom of the string to form a string insertion portion.

An object of the present invention is to make the insertion portion wider when forming the insertion portion through which a string, particularly a wide string or a plurality of strings, is inserted by welding the folded overlapping portion of the bag in the insertion direction of the string. To provide a manufacturing device for a bag with a string, which prevents the string and the bag body from being erroneously welded together.

[Means and effects for solving the problem] The present inventor has provided a guide tube through which the string is inserted in the folded overlapping portion in the string insertion direction, and a welding device that connects the folded overlapping portion in the vicinity of the guide tube. If welded by
We have found that even when a plurality of strings are inserted, it is not only possible to form the insertion part of the string narrow, but also that it is possible to prevent the strings from being erroneously welded to the film, and have thus come to provide the present invention. It is ivy. That is, a guide tube for the cord, which is longer than the welding device in the string insertion direction, is fixed so as to be located within the folded overlapping part at the point where the cord insertion part is welded, and the cord is attached to the inside of this guide tube, and the cord is attached to the outside of the guide tube. The folded overlapping portions are respectively fed. The overlapping part of the conveying body that has been moved to the guide cylinder is
Using a welding device, the pieces are welded by sandwiching them from the front and back to form a cylindrical insertion part for the string.

At this time, the guide tube prevents the string from spreading in the width direction of the film (in the longitudinal direction of the finished bag) and also prevents the string from being welded to the film.

[Example] Next, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a bag with strings manufactured using the apparatus for manufacturing bags with strings according to the present invention. The bag body is formed by folding a thermoplastic synthetic resin film at the bottom part 14 and welding the left and right side parts 15 and 16. The upper edge of the bag body is folded inward by a predetermined length, and each folded overlapping part 12 The front and back films and the respective folded pieces are welded at welding parts 17 and 18 at the lower end and a part slightly above the lower end, and the string insertion part 1
9 is formed into a cylindrical shape. Approximately circular notches are provided at both left and right ends of the string insertion portion 19 formed in this way, the notches are open at the side ends, and the upper and lower ends of the openings are opened downward or upward, respectively. The tip of the head protrudes like a beak. Thermoplastic synthetic resin strings 24 and 26 are inserted into the insertion portion 19, and by welding and/or tying the ends of the strings together at the left and right notches 20 and 20, the strings can be inserted into the ring. It forms and goes around the inside of the insertion part 19. String 2
4 and 26 to the left and right, the films of the insertion portion 19 come together and the bag body 11 is closed.

FIGS. 2 and 3 are schematic diagrams showing an embodiment of a string bag manufacturing apparatus according to the present invention.

In FIG. 2, numerals 31 and 33 are raw rolls wrapped with heat-fusible film, which is the material of the bag body, and raw films 32 and 34 are rolled from these rolls.
is sent out. These two films 32, 34
The films merge at the direction changing roll 35 to form a double film 36, and then pass through the folding roll 37. The length in the axial direction of the folding roll 37 is shorter than the width of the film 38, and therefore, although not shown, both side edges of the film 36 protrude outward from the roll 37 by a predetermined length and extend toward the side surfaces of the roll end. Bend. This bent piece is folded back by the pushing piece 41 to form a folded overlapping portion 12. The narrow strings 24 and 26 supplied from the rolls 38 and 39 are attached to the film 36 via the roll 37, and the bent piece is placed on top of the film 36, so that the narrow thermoplastic string is attached to the bent portion. 24 and 26 will be inserted. In this way, the folded overlapping portions 12 into which the strings 24 and 26 are inserted are formed at both widthwise edges of the film 36.

Next, the film in such a state is further sent upward and transferred downward via the direction changing roll 43. At this time, a folding guide plate 45 is provided along the film feeding path. Since the folding guide plate 45 has an inverted triangular shape (see FIG. 3), the film 36 is bent along both side edges 46, 46 of the guide plate 45 as it is fed, and the direction changing roll 47 at the lower end is bent. When passing through,
The polymer film 48 is completely folded in half.

Thereafter, the polymer film 48 is sequentially changed direction and fed through the direction change rolls 46, 51, 53, 55, and 57.

The polymerized film 48 is fed horizontally between the rolls 57 and 63. At this point, a perforation punch 59 is disposed above the film 48 so as to move up and down, and below the film 48, a perforation punch 59 is arranged to move vertically. A pedestal 61 is arranged corresponding to the punch 59. The film 48 is fed intermittently, and when the film 48 stops, the punch 59 is lowered and the third
As shown in FIG. 4A, cutouts are made at the lower portions of the folded overlapping portions 12 at various locations on the front and back sides of the film 48. The notch is approximately 8 pieces connecting two circles.
The film 48 is cut in the width direction (perpendicular to the feeding direction) at the center of the cutout, as will be described later. Therefore, as described above with reference to FIG. 1, there are approximately circular notches at the upper portions of both left and right ends of the bag body, the notches are open at the side ends, and the upper and lower ends of the openings are located downwardly and upwardly, respectively. It will protrude like a beak when facing.

The polymerized film 48 further travels and rolls 63
It ascends vertically towards the roll 67 via the.
At this time, a string guide member 64 is arranged along the travel path of the film 48, so that the string 24,
26 moves to the position of the previously drilled notch 20 and becomes exposed to the outside. FIG. 3b is a view of the string guide member viewed from the right side of the film 48. That is, the polymeric film 48 being fed
A part of a rectangular string guide member is placed in each folded overlapping portion 12 located on each side edge of the front and back sides. The strings 24 and 26 move from the bottom to the top together with the film 48, but below the strings 24 and 26, in order to prevent the strings from being cut together in the process of punching the notch, the strings 24 and 26 are moved to the point where the notch 20 is removed. It is located in In the guide plate 64, a first hole 65 is provided near the folded end edge of the folded overlapping portion 12, and a second hole 66 is disposed inwardly. By passing through, the laces 24, 26 extend along the inner end 17' of the folded overlapping portion 12 of the overlapping film 48 and into the notch 20.
guided so that it is exposed at

Next, the film 48 is transferred to rolls 69, 71, 7.
3 and vertically descends toward the roll 85. At this time, a pair of hot seal parts 76, 76, which are welding devices, are provided on both sides of the film 48 to form welded parts 18, 17 in the vicinity of both the strings 24, 26 inserted into the lower part of the folded overlapping part 12. It is being The hot seal portion 76 is made of polymer film 48.
The front and back pieces are sandwiched from both sides and welded together, but a separator 75 is provided to prevent the occasionally turned pieces from welding together, thereby separating the front and back pieces. Also, the string 2 is fixed so that the film 48 and the strings 24, 26 do not weld.
A guide tube 79 through which the tubes 4 and 26 pass is provided within the folded overlapping section, which is a feature of the present invention.

As shown in FIG. 4, the film 48 and the string 2
4 and 26 run intermittently from above to below,
Two strings 24 and 26 are attached to the inside of the guide tube 79 having a flat elliptical cross section, and the outer side is folded back to form the overlapping part 1.
2 pass intermittently. When the film 48 stops, the hot seal portions 76, 76 narrow the front and back sides of the film 48, and weld the outer portion of the guide tube 79 along the guide tube 79.

The hot seal part 76 has a pair of parallel protrusions 77, so that both sides of the outer side of the guide tube 76 can be welded.
It has 78. Since the interval between these protrusions 77 and 78 is slightly longer than the major axis of the guide tube 79, even if the string insertion section 19 is formed into a cylindrical shape by welding, there is a gap between it and the guide tube 79. The insertion portion 19 smoothly passes downwards outside the guide tube 79.
In addition, since the guide tube is slightly longer than the protrusions 77 and 78 and protrudes upward and downward from both the upper and lower ends of the protrusions 77 and 78, the strings 24 and 26 and the film 48 will not be erroneously welded together.

Although not shown, the guide tube 79 is fixed to the device main body at the upper end, so the hot seal portion 7
6 and subsequent passage of the insertion portion 19.

Note that the guide tube may have any shape as long as it is longer in the string insertion direction than the welding device that welds the insertion portion, but it may have a flat elliptical cross-sectional shape as in this example. If it is shaped like this, it will not get in the way when the welding device is welding the vicinity of the guide tube, and it is preferable that it will not interfere with the smooth movement of the string within the guide tube.

After the welded insertion portion 19 passes through the outside of the guide tube 79, a string insertion portion 19 is formed in the shape of a long cylinder on the inside of the folded overlapping portion 12, as shown in Fig. 3c. The strings 24 and 26 will be located inside this.

Two strings 24 and 26 are exposed in cutouts 20 formed at predetermined intervals in the insertion portion 19, and such a polymerized film 48 is further fed.

The polymer film 48 is fed intermittently to the roll 91.
When the vehicle passes through and stops, as shown in Figure 6,
Two strings 2 in each of the insertion parts 19 and 19 on the front and back sides
4, 26; Two guide members 97, 97 having W-shaped grooves for 24, 26 rise from below and engage with the two sets of strings 24, 24: 26, 26, and connect these strings. The guide members 97, 97 are aligned and held at the bottoms 98, 99 of the W-shaped grooves. At this time, the hot iron 93 descends from above in the middle of the guide members 97, 97, and cuts the film 48 in the width direction across the entire width of the film 48 at the middle of the portion held by the guide members 97, 97. By the fusing, the bag body 11 and the two loop-shaped strings 24 and 26 shown in FIG. 1 are formed, and the notches 20 for drawing out the strings 24 and 26 are formed into a substantially circular shape.

After fusing, knots 28 and 30 are provided near the fusing part to prevent slipping by thick fusing parts 27 and 29 formed in the strings 24 and 26 by the fusing, and the ring-shaped string 2
4 and 26 are durable and difficult to unravel.

As shown in FIG. 1, the bag with strings manufactured by the apparatus of this embodiment has strings 24 and 26 inserted through the opening end 13 of the bag body 11 at a constant interval.
4 and 26 to both the left and right sides, as shown in FIG. 7, the insertion part 19 is constricted and the film in that part is brought together, but the part above the insertion part 19 to the opening end is directed upward. It will spread out like a corolla. To open the bag, all you have to do is grab the top of the bag and pull it to the left and right.If the contents are heavy, you can easily transport them by bundling the part up to the open end above the insertion part. .

In this embodiment, a manufacturing apparatus for a bag with a string is shown in which two strings are inserted into one insertion part, but two guide tubes are arranged in parallel in each folded overlapping part, and one string is inserted into each guide tube. It is also possible to insert a string and weld the folded overlapping part between the two guide tubes. In that case, both protrusions 77 and 78 of the hot seal part 76
A third protrusion may be provided between them.

[Effects of the Invention] If a bag with strings is manufactured using the apparatus for manufacturing bags with strings according to the present invention, even if a wide string or multiple strings are used, these strings are accommodated in the guide tube and separated from the film. This prevents the string from spreading in the longitudinal direction of the bag, and also prevents the string from being erroneously welded to the film. Therefore, a string bag made of thermoplastic synthetic resin can be easily and reliably manufactured. In addition, the width of the string insertion part can be set to the minimum necessary width without interfering with the smooth movement of the string, and even when multiple strings are inserted, the manufactured bag with string is excellent. It has a beautiful appearance.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a bag with strings manufactured by the apparatus according to the present invention, FIG. 2 is a schematic diagram showing the first part of the manufacturing apparatus according to the embodiment of the present invention,
FIG. 3 is a schematic diagram showing a portion of the manufacturing apparatus according to the embodiment of the present invention following the previous diagram, in which a, b,
c schematically shows the details of each step, and FIGS. 4 and 5 are diagrams showing an example of the essential parts of the present invention, in which FIG. 4 is a partially enlarged perspective view seen from below, and FIG.
The figure is a bottom view, FIG. 6 is a partially enlarged perspective view showing the fusing means of the manufacturing apparatus according to the embodiment of the present invention, and FIG. 7 is a front view showing the tied bag shown in FIG. 1 in a closed state. . Explanation of symbols, 11...Bag body, 12...Folded overlapping part, 19...String insertion part, 24, 26...
String, 76... Welding device (hot seal part) 79...
...Guidance tube.

Claims (1)

[Claims] 1. A means for transporting a long thermoplastic synthetic resin film folded into two front and back pieces by folding its open end in a state where the front and back pieces are overlapped, and inserting a string into each of the folded and overlapping portions, and means for welding the front and back films and each folded piece in the film feeding direction using a welding device in the vicinity of the film to form a cylindrical insertion portion for the string; and for cutting the film at regular intervals in the film width direction. In an apparatus for manufacturing a bag with a string, the apparatus comprises: a means for forming a bag;
A bag with a string, characterized in that a guide tube through which the string is inserted and which is longer than the welding device in the film feeding direction is provided in each of the folded and overlapping portions of the welding location and in the film feeding direction. manufacturing equipment.