JP4441742B2 - Tube forming method and round bottom bag or balloon using the tube - Google Patents

Description

[0001]
[Industrial application fields]
When the end of a tube made of plastic film is inflated with air or something in it, it becomes half the shape of a sphere, that is, a method for forming the end into a semi-sphere. As an application, bags and toys for confectionery etc. There are balloons.
[0002]
[Prior art]
Since it is not possible to make a round-bottom bag with a circular bottom with a film such as polyethylene, it is impossible to make a flat bottom bag alone. Then, it was put on a work table such as a circular table, and the round film was sealed back and forth with a circular film back and forth while cutting around the aperture block.
[0003]
With balloons, vinyl chloride was sealed with a high-frequency sewing machine or the like according to a 6- or 8-sided pattern, and the fabric was stretched to create a beautiful spherical shape. However, it was time-consuming and expensive. Since such a fine work could not be performed, the two overlapping films were simply sealed in a circle. The present applicant, who is not tired of them, made a spherical shape in utility model No. 2020593 by sealing the end of the folded tube in full width.
[0004]
[Problems to be solved by the invention]
The round bottom bag according to Japanese Patent No. 1458880 has a lot of three-dimensional work, such as squeezing the center of the bottom or sealing it on a circular table, which is very time-consuming. Therefore, it was a beautiful bag, but its use was limited due to its high processing unit price.
[0005]
The balloon of utility model No. 2020593 has a large cocoon inside, and there are a lot of fine cocoons toward the center. But there was only. This was a fatal drawback of this polyethylene balloon that is often used as an advertising medium. Moreover, even if this manufacturing method was used for one end of the tube, the single large ridge was not familiar with the circular bottom plate, and it was difficult to form a round bottom bag.
[0006]
[Means for Solving the Problems]
To make the end of a tube of polyethylene or the like into a semi-spherical shape, crush the tube into a flat band, seal the end airtight, and fold it back and forth at the center line in the length direction of the tube. Further, the seal on the end seal was further sealed, but about half from the centerline side which was broken at this time was not sealed, and only the rest to the corner of the end was left.
[0007]
Using this half-circle-forming method at one end of the tube, a round-bottomed bag can be made by inserting a circular bottom plate, and by using it at both ends of the tube while providing an air inlet or check valve, I was able to make it.
[0008]
【Example】
FIG. 1 is a perspective view of a round bottom bag 1 in which the present invention is applied to one end of a transparent polyethylene tube, from a position where the bottom 2 can be seen. As shown in the perspective view of FIG. 2, the tube 3 cut at an appropriate length perpendicular to the length direction of the original fabric by the inflation method is sealed 4 along the cut surface, and then the perspective view of FIG. Fold it in half along the center line 5 in the length direction as shown in the figure, then over the seal 4 as shown in the perspective view of FIG. Further, the four-layer seal 7 is formed by sealing.
[0009]
When the circular bottom plate 9 is put into the bag 1 from the opening 8 at the other end, then the candy balls 10 and the confectionery are put, squeezed and stopped with the string 11, the beautiful round bottom bag 1 as shown in FIG. 1 is obtained. . The part of the four-ply seal 7 is the center of the bottom, but it is smaller and thinner than the mass of utility model No. 2020593, and there is no thick crease inward that can be done when the full width of the four-ply seal is performed, so it is circular The bottom plate 9 is also familiar and can be placed stably. The tube can be made in a variety of ways so that this round bottom may be applied to a drawstring bag with side seals.
[0010]
When the processing of the present invention is performed on both ends of the tube, a smooth spherical balloon is obtained as shown in the perspective view of FIG. In the manufacturing method, an air valve 12 may be provided as shown in the perspective view of FIG. 6 at the time of sealing at either end, or the air blowing port 13 may be formed simultaneously by a slit seal as shown in the perspective view of FIG.
[0011]
The position of the quadruple seal from the corner and the length do not have to be exactly above or half of the previous seal, but may be in the vicinity. However, as the length becomes shorter than half, it becomes closer to a rectangle, and when it becomes longer than half, the roundness increases, but there are fewer wrinkles.
[0012]
In the case of mass production, a bag making method may be used in which sealing performed twice at the same location is performed once by printing or medium. As shown in the plan view of FIG. 8, at the position 15 that will become the bottom of the original fabric 14 that is a tube in the future, a quarter of the width is avoided from the corner, and the rest is printed. Then, the sheet is folded in half at the center line 5 and a full width seal is made at a fixed position 15 and cut at an appropriate length. This is also one of the methods of the present invention, and the order of sealing and folding may be changed.
[0013]
As another application example, when applied to a bag with an opening with a chuck and a strap for shoulder straps in the body part at the center of the tube, both ends are squared even if an object is inflated as shown in the perspective view of FIG. Because it is not stretched, it will not hurt others due to crowds, and it will be a safe habit.
[0014]
【The invention's effect】
The semicircular sphere at the end of the tube according to the present invention is a forming method in which the aneurysm gathered at the end is small compared to other methods, and in particular, it is not obstructed even in a round bottom bag, is smooth and has a wide application range. It can be said.
[0015]
Round-bottom bags can be made very easily and are therefore cheaper, so they can be used easily in confectionery bags and drawstring bags, providing a new form of fun.
[0016]
Balloons can now be printed on both sides of the earth, making it a very powerful advertising medium along with its low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a round bottom bag according to the present invention.
[Figure 2]
4 is a perspective view showing a manufacturing method of the round bottom bag of FIG. 1. FIG.
FIG. 5 is a perspective view of an example balloon of the present invention.
[Fig. 6]
7 is a perspective view showing a method for manufacturing the balloon of FIG. 5. FIG.
FIG. 8 is a plan view showing a printing surface for mass production.
FIG. 9 is a perspective view of another example of the bag of the present invention.
[Explanation of symbols]
1 confectionery round bottom bag 2 bottom 3 tube 4 seal 5 center line 6 corner 7 quadruple seal 8 opening 9 bottom plate 10 candy ball 11 string 12 air valve 13 air inlet 14 tubular raw fabric 15 bottom position

Claims (3)

Cut the tube of plastic film produced by the inflation method vertically to an appropriate length, crush it into a flat band, seal its end, and fold it back and forth at the center line in the length direction of the tube. In addition, except for the side close to the center line on the overlapped end seal, further seal the other half around the end of the corner so that the end is rounded when inflated . A tube forming method characterized by the above. A tube formed by the tube forming method according to claim 1 is inflated into a tube having a rounded end , and a circular bottom plate is further inserted into the end. Bottom bag. A tube of plastic film produced by the inflation method is cut vertically to an appropriate length, crushed into a flat band, and sealed at both ends with a check valve at one end, and the center line in the length direction of the tube In the structure where the tube is sealed on the overlapping end seals, except for the side close to the center line, and the remaining half of the tube is further inflated, and rounded at both ends. A balloon characterized by being.

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