JP4547701B2 - Bag with string - Google Patents

Description

  The present invention relates to a bag made of a synthetic resin film used in homes or offices, and more specifically, after storing an object in the bag, the bag body can be easily and strongly closed. Further, the present invention relates to a bag with a string provided so that a string for binding an opening can be easily separated.

Conventionally, garbage bags made of synthetic resin film used in homes and offices form a bottom by welding a tubular film obtained by an inflation molding method perpendicularly to the longitudinal direction of the tubular film. And what cut | disconnected in the same direction and formed the bag mouth (refer patent document 1) etc. are used.
Japanese Examined Patent Publication No. 2-46376

  In such a conventional garbage bag made of a synthetic resin film, after storing an object in the bag, in order to prevent the object stored from the opening from jumping out and scattering, and depending on the object stored, In order to prevent odors from leaking to the outside, it is necessary to close the opening of the bag. In this case, it is ideal to close the opening by squeezing it and tying it with a strap, but each time it is necessary to prepare an appropriate length of the strap separately from the bag, which is troublesome. Therefore, in many cases, the bag is closed by connecting one peripheral edge of the opening of the bag and the peripheral edge on the opposite side.

  However, in the method of closing the bag by connecting the peripheral edges on both sides of the opening of the bag, the hands are soiled by the items contained in the bag and the opening is completely closed. Therefore, if the contents in the bag go out of the bag, or if the knot is loose, it will unravel and reopen. In addition, depending on what is contained in the bag, there is a problem that odor is likely to leak to the outside.

  The present invention has been made in consideration of the related circumstances, and the object of the present invention is to prepare a string that can be easily separated from the bag body and binds the opening of the bag. Even if it is not, it exists in the provision of the bag with a string which can close a bag easily and firmly by separating and using the string part with which the bag main body was used as a string.

The present invention has been devised in order to solve the above-mentioned problem, and more specifically, by thermally welding the opening on one end side of the cylindrical synthetic resin film at a position somewhat inside the edge. A bag body comprising a bag body which is closed and formed with a bottom portion, and an elongated string portion attached to the bag body along the edge of the bottom portion at the same time by the thermal welding, wherein the string portion and the bag body During the thermal welding, the thin portion is thermally fused while leaving a thin portion, and the thin portion is closer to the string portion than the angle α formed by the bag body side surface and the base surface perpendicular to the bag surface. The present invention relates to a bag with a string, characterized in that it has an asymmetric melt section where the angle β formed by the base surface and the base surface is larger, and a lump is formed on the melt section on the bag body side .

  A preferred aspect of the present invention relates to the bag with a string, wherein the string portion is further laminated with a string-like synthetic resin film to form a three-layer structure.

Further, preferred embodiments of the present invention, the thin portion the string portion or of the also vicinity of the bag body, wherein the string portions also synthetic resin film between said bag body, is further welded The present invention relates to a stringed bag according to claim 1.

  In a preferred aspect of the present invention, the synthetic resin film of the bag body is further recessedly welded along the thin portion of the thin-walled portion adjacent to the bag body side to form a groove. It is related with the said bag with a string characterized by the above-mentioned.

Further, another aspect of the present invention is that a rectangular sheet-like synthetic resin film is folded in two layers, the folded end is the bottom, and the left and right ends overlapping the two layers are somewhat inward of the edges. A bag body comprising a bag body which is closed by heat welding and formed on both left and right side portions, and an elongated string portion which is simultaneously attached to the bag body along the edges of the left and right side portions by the heat welding. In the heat welding, the string portion and the bag main body are thermally fused leaving a thin portion, and the thin portion is perpendicular to the bag main body side surface and the bag surface. It has an asymmetric melting section where the angle β formed between the surface on the string side and the base surface is larger than the angle α formed with the base surface, and a lump is formed on the melting section on the bag body side. It is related with the bag with a string characterized by comprising.

  According to the present invention, the bag body is provided with a string portion that can be easily separated, so there is no need to prepare a string for tying the opening of the bag separately from the bag, the separated string portion, It can be used as a string that binds the opening of the bag. Therefore, it is not necessary to take a method of closing the bag by connecting the peripheral portions on both sides of the opening of the bag, and it is possible to obtain an effect that the bag can be easily closed without being troublesome.

  Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings.

  As shown in FIG. 1, the stringed bag 1 of the present invention is composed of a bag body 3 and a string portion 7, an upper portion of the bag body 3 is opened, and a bottom portion 4 is formed at a lower portion of the bag body 3. Is formed. Further, along the edge of the bottom portion 4, an elongated piece of string portion 7 is attached.

Such a stringed bag 1 is formed from a single cylindrical synthetic resin film 2. As the material of the synthetic resin film 2, polyethylene, polypropylene, thermoplastic resins such as polyvinyl chloride le is used.
An example of manufacturing the stringed bag 1 (bag body 3 and string part 7) is shown below.
As shown in FIG. 2 (a), a continuous cylindrical synthetic resin film sent out in a folded state from a molding machine is formed into a cylindrical composition for a predetermined length (corresponding to the height of the bag). Perpendicular to the longitudinal direction of the resin film (along the cutting line 11 (after cutting, the end 5 of the string portion 7) and the cutting line 12 (after cutting, the opening 19 of the bag body 3)) The bag 1 with a string is formed by cutting with a cutter into one end 9 and the other end 10. At the time of this cutting, at the same time, a portion 6 slightly inside the edge 5 (cutting line 11) of the one end portion 9 is thermally welded, so that the bottom portion 4 of the bag body 3 and the edge of the bottom portion 4 are aligned. The stringed bag 1 is manufactured by forming an elongated string piece 7.
More specifically, as shown in FIGS. 2 (b) and 2 (c), when the opening of the end 4 on one end side is closed by thermal welding, a location somewhat inside the edge 5 of the end 9 is provided. 6 is parallel to the edge 5 and an asymmetric V-shaped heat cutter 13 (blade surface 14 and base surface on the bag body 3 side) is left so that a thin portion 8 is left between the bag body 3 and the string portion 7. 15 is an acute angle, and the angle β formed between the blade surface 16 on the string portion 7 side and the base surface 15 is larger than the angle formed between the blade surface 14 on the bag body 3 side and the base surface 15. And thereby forming the bottom portion 4 of the bag body 3, and simultaneously forming an elongated piece of string portion 7 along the edge of the bottom portion 4, Manufactured.

  FIG. 3 shows a cross-sectional view (a-a ′ cross-sectional view in FIG. 1) of the bag 1 with a string of the present invention in which the bag body 3 and the string portion 7 are formed. The bag body 3 and the string portion 7 are heat-cut so that the melted cross section 17 is V-shaped, leaving a thin portion 8. Therefore, since the string portion 7 is only attached to the bag body 3 via the thin portion 8, it can be easily separated from the bag body 3 by pulling. Further, the synthetic resin films 22 and 22 of the string portion and the synthetic resin films 23 and 23 of the bag body are thermally welded at the fusion cross section 17, and the asymmetric V-shaped heat cutter 13 is used for the thermal welding. Therefore, a large amount of the resin melted by heat gathers on the bag body 3 side and solidifies to form a large lump portion 18. Therefore, the synthetic resin films 23 and 23 of the bag body are welded more strongly than those simply heat-welded.

  By taking such a structure, the string part 7 can be easily separated from the bag body 3, and the separated string part 7 can be used as a string for binding the opening 19 of the bag body 3. Therefore, it is not necessary to prepare a string for binding the opening 19 of the bag body 3 separately from the bag, and it is not necessary to close the bag by combining the peripheral portions on both sides of the opening of the bag.

  In the present embodiment, as shown in FIG. 4, except that a string-like synthetic resin film 20 was further laminated on the two-layered string part 7 and the string part 21 had a three-layer structure. The stringed bag 1 (the bag body 3 and the string portion 21) is made by the same method as in Example 1.

  As shown in FIG. 4, the bag body 3 and the string portion 21 are heat-cut so that the melted cross-section 17 becomes an asymmetric V-shape, leaving the thin portion 8. Further, the string portion 21 has a three-layer structure in which a string-like synthetic resin film 20 is further stacked on the two-layer synthetic resin films 22 and 22 and welded together by heat fusing. Since such a three-layered string portion 21 is thicker than the two-layered string portion 7, it has a high strength when used as a string by being separated from the bag body 3. Therefore, in the string portion 7 composed of the two-layer synthetic resin films 22 and 22 as in Example 1, when the necessary tensile strength for use as the string is insufficient, the two-layer synthetic resin films 22 and 22 are used. The strength required for the string can be increased by stacking a further synthetic resin film 20 in the form of a string on the top and thermally fusing and welding together.

  When the bag 1 with the string according to the present embodiment is thermally fused between the bag body 3 and the string portion 7 leaving the thin portion 8, as shown in FIG. 5, the vicinity 24 of the thin portion 8 is further provided. 24, the synthetic resin films 22 and 22 of the string portion and the synthetic resin films 23 and 23 of the bag body are also heat-welded, and thus the configuration is the same as that of the first embodiment.

  The relationship between the bag body 3 and the string portion 7 is as described above. As shown in FIG. 5, the synthetic resin films 22 and 22 of the string portion and the synthetic resin films 23 and 23 of the bag body 17 is welded at the string portion 7 of the thin portion 8 and the vicinity portion 24 on the bag body 3 side. Therefore, in the bag of the present embodiment, the strength of the bottom portion 4 of the bag body 3 is further increased, and the tensile strength of the string portion 7 is further increased.

  When the bag 1 with the string of the present embodiment is thermally fused between the bag body 3 and the string portion 7 leaving the thin portion 8, simultaneously, as shown in FIG. 6, the bag body 3 of the thin portion 8. In the side adjacent part 26, the synthetic resin films 23 and 23 of a bag main body are dent welded along the thin part 8, and the structure similar to Example 1 except the groove | channel 25 being formed. Consists of.

When manufacturing such a stringed bag 1, as shown in FIGS. 7 (a) and 7 (b), a flat heat seal is used at the same time when heat cutting is performed with an asymmetric V-shaped heat cutter 13. At 27, the synthetic resin films 23 and 23 of the bag body are welded along the thin part 8 so that the cross-section is concave with respect to the bag body 3 side adjacent part 26 of the thin part 8. The stringed bag 1 manufactured in this way has a groove 25 formed in the bag body 3 side adjacent portion 26 of the thin portion 8.

  Although the relationship between the bag body 3 and the string portion 7 is as described above, as shown in FIG. 6, the synthetic resin films 23 and 23 of the bag body are not only welded to each other at the melting section 17, The synthetic resin films 23 and 23 of the bag body are also recessed and welded at the bag body 3 side adjacent portion 26 of the thin portion 8. Therefore, in the bag of this embodiment, the bottom 4 of the bag body 3 is welded to the bottom 4 of the bag 4 in the melted cross section 17 and the concave groove 25, so that the strength of the bottom 4 of the bag 3 is further increased. .

The stringed bag 28 of the present invention is also formed from a single rectangular sheet-shaped synthetic resin film 29 .

As shown in FIG. 8, the bag 28 with a string is composed of a bag body 36 and two string parts 39, and an end 30 folded in two layers is used as a bottom 31, and left and right ends 32, 33 Left and right side portions 37 and 38 of the bag body 36 are formed. And along the edge of the right-and-left both sides 37 and 38, the elongate one piece string part 39 and 39 is adhered, respectively.

  An example of manufacturing the stringed bag 28 is shown below. First, as shown in FIGS. 9A and 9B, a rectangular sheet-shaped synthetic resin film 29 is prepared, and the synthetic resin film 29 is folded into two layers along the folding line 44. Then, as shown in FIGS. 9C and 9D, the folded end portion 30 is a bottom portion 31 and is slightly inward from the end edges 34 and 34 of the left and right end portions 32 and 33 that overlap two layers. The left and right side portions 37 and 38 are formed by heat welding and closing the portions 35 and 35 at the same time, and at the same time, elongated strip portions 39 and 39 are formed along the edges of the left and right side portions 37 and 38, respectively. Thus, the stringed bag 28 is manufactured. At the time of the thermal welding, the heat cutter 13 as described above is thermally fused with the thin portion 40 remaining between the bag body 36 and the string portion 39.

The adhesion state of the bag body 36 and the string portion 39 and the welded state of the synthetic resin films 42 and 42 of the bag body and the synthetic resin films 41 and 41 of the string portion are the same as those shown in the first embodiment. Therefore, two strings can be used to bind the opening 43 of the bag body 36 by separating the string part 39 from the left and right side portions 37 and 38 of the bag body 36.
Even if the garbage is stored to the full capacity of the bag body 36, the left and right side portions 37, 38 of the bag body 36 will not open.

  As described above, in any case, the string-attached bag of the present invention is heat-melted between the bag main body and the string portion so as to leave a thin portion and have a V-shaped cross section. Therefore, since the string portion is only attached to the bag body through the thin portion, it can be easily separated from the bag body by pulling. Therefore, if the bag with a string of the present invention is used, the bag can be easily and strongly closed by separating the string part provided in the bag body and using it as a string without preparing a string for binding the opening of the bag. be able to. Therefore, when closing a bag, it is not necessary to take the method of uniting the peripheral part of the both sides of the opening part of a bag.

It is a perspective view of the bag with a string of Example 1. FIG. FIG. 3 is a perspective view showing a manufacturing process of the stringed bag of Example 1. It is a perspective view which shows the manufacturing process of the bag with a string shown by FIG. 2a concretely. It is a perspective view which shows the manufacturing process of the bag with a string shown by FIG. 2a concretely. It is a-a 'sectional drawing of the bag with a string of Example 1. FIG. It is sectional drawing of the bag main body in the bag with a string of Example 2, and the heat fusing part vicinity of a string part. It is sectional drawing of the bag main part in the bag with a string of Example 3, and the heat fusing part vicinity of a string part. It is sectional drawing of the bag main part in the bag with a string of Example 4, and the heat fusing part vicinity of a string part. It is a perspective view which shows the manufacturing process of the bag with a string of Example 4. FIG. It is a perspective view which shows the manufacturing process of the bag with a string of Example 4. FIG. It is a perspective view of the bag with a string of Example 5. It is a perspective view which shows the manufacturing process of the bag with a string of Example 5. FIG. It is a perspective view which shows the manufacturing process of the bag with a string of Example 5 after the process shown by FIG. 9a. It is a perspective view which shows the manufacturing process of the bag with a string of Example 5 after the process shown by FIG. 9b. It is a perspective view which shows the manufacturing process of the bag with a string of Example 5 after the process shown by FIG. 9c.

Explanation of symbols

1. 1. Bag with string 2. Cylindrical synthetic resin film Bag body 4. Bottom 5. Edge 6. Somewhere inside 7 String part 8. Thin part 9. One end 10. Other end portion 11. Cutting line 12. Cutting line 13. Heat cutter 14. Blade surface 15. Base surface 15 16. Blade surface α. Angle β. Angle 17. Melting section 18. Bulk part 19. Opening 20. String-like synthetic resin film 21. String part 22. Synthetic resin film of string part 23. Synthetic resin film of the bag body 24. Near part 25. Concave groove 26. Adjacent part 27. Flat heat seal 28. Stringed bag 29. Rectangular sheet-shaped synthetic resin film 30. End 31. Bottom 32. Left end 33. Right end 34. Edge 35. Some inside point 36. Bag body 37. Left side 38. Right side 39. String part 40. Thin part 41. Synthetic resin film of the string part 42. Synthetic resin film of the bag body 43. Opening 44. Fold line

Claims (5)

The opening on one end side of the cylindrical synthetic resin film is closed by thermally welding a portion somewhat inside the edge, and a bag body having a bottom is formed, and the bottom portion is simultaneously attached to the bag body by the heat welding. A string-attached bag consisting of an elongated string portion attached along an edge of the bag, wherein the string portion and the bag body are thermally fused while leaving a thin portion during the thermal welding, The portion has an asymmetric melting section where the angle β formed by the surface on the string side and the base surface is larger than the angle α formed by the surface on the bag body side and the base surface perpendicular to the bag surface. And the bag with a string characterized by forming a lump part in the melt section of the bag body side .   The string-attached bag according to claim 1, wherein a string-like synthetic resin film is further laminated on the string portion to form a three-layer structure. For even vicinity of the strap portion or the bag body side of the thin portion, said cord portion also has a synthetic resin film between said bag body, according to claim 1, characterized in that it is further welded Bag with string.   The synthetic resin film of the said bag main body is further dented and welded along the said thin-walled part about the said bag body side adjacent part of the said thin part, The concave groove is formed. Bag with string. A rectangular sheet-shaped synthetic resin film is folded in two layers, the folded end is the bottom, and the left and right ends that overlap the two layers are closed by heat-welding some places inside the edges. A bag main body formed with left and right side portions, and a string-attached bag comprising a string portion attached to the bag main body along the edge of the left and right side portions simultaneously by the thermal welding, the string portion and the bag During the heat welding, the main body is thermally cut leaving a thin portion, and the thin portion is more string than the angle α formed by the surface on the bag body side and the base surface perpendicular to the bag surface. A bag with a string, which has an asymmetric melting section where the angle β formed by the surface on the part side and the base surface is larger, and a lump portion is formed on the melting section on the bag body side.

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