JP2006056523A - Square bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag with self-supporting ability, easy to put in contents and resistant to the contents spilling out. <P>SOLUTION: The bag includes gussets on both side rims and a rectangular bottom, and has constriction parts 4 formed by notching the side rims. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a square-bottom bag having a rectangular pillar-shaped self-supporting bottom, and to a square-bottom bag that is difficult to spill contents useful as a storage bag for powder and solids or a garbage bag.

Conventionally, it is a flat bag made of polyethylene film as a storage bag for garbage and solids, and a garbage bag. It is not self-supporting, and after use, the opening is tied with a string to seal the contents. Many bags are used. For example, Patent Document 1 discloses a composite paper that is folded in two and has a strip shape with arms on both sides thereof, and a bottomed cylindrical shape in which the waist paper is fixed inside or outside the upper edge opening. It is composed of a bag portion made of a resin thin film, and an adhesive tape is disposed on the back surface of the waist paper, and both sides of the bag portion are formed in a gusset having a width of the arm portion. A disposable assembly garbage bag is described, and Patent Document 2 describes a garbage bag in which at least one gusset portion is formed of a transparent film in a part of the bag. Each of these garbage bags has a simple square front and back film, and when it is placed on the floor, etc., it is not self-supporting, so it can easily fall down, and the contents can easily spill when it falls down. There were drawbacks.
Japanese Utility Model Publication No. 6-762201 Japanese Utility Model Publication No. 6-72903

  The present invention has been made as a result of various studies to solve the above-mentioned drawbacks. The object of the present invention is to have self-supporting properties, and to be used when placed alone on a floor or the like. Provided is a square-bottom bag in which contents such as a body, solid matter, and dust are not easily spilled, can be easily sealed with a string, and has a wide opening so that the contents can be easily charged.

  The gist of the present invention is a square-bottom bag comprising gussets on both side edge portions, a bottom surface of a square bag, and a narrowed portion formed by cutting out the side edge portion.

  When the square-bottom bag of the present invention is used as a storage bag or a garbage bag for particles, solids, etc., since it is self-supporting, it is difficult to collapse, and since the input port is wide, it is easy to input the contents and has a throttle part Therefore, once the contents are thrown in, it is difficult to spill, and there is an effect that it is easy to bind using a separately prepared string or the upper side of the square bottom bag of the present invention.

The present invention will be described in detail.
The material constituting the bag of the present invention is not particularly limited. For example, it is a synthetic resin film or sheet (hereinafter simply referred to as “film”) having a thickness of about 20 to 200 μm, and is a heat-fusible resin. Or a multilayer film having a sealant layer made of a heat-fusible resin in the innermost layer. Using such a film, a square-bottom bag having a rectangular columnar bottom surface is formed. The square-bottomed square bottom bag with a square bottom surface may be either a gusset bag or a square-bottom bag in which a square bottom film is fused to a square cylindrical body film, but both side edges of a tube made by the inflation method. A square bottom bag with a gusset provided by folding the part inward is preferable in consideration of productivity and the like. And, if the corner seal is provided by fusing at an angle of about 45 ° from the intersection of the inner end and bottom side of the gusset of the square bottom bag to the side edge portion, the contents will not enter the corner portion. Sex is not hindered, which is preferable. Furthermore, when the outside of the corner seal is cut, the self-supporting property is further improved. When the contents are put into these bags, the gussets are opened and the bottoms become square prismatic bags. Then, at least one of the rectangular columnar bags, preferably a part of both side edge portions, is cut out by punching or the like, and the periphery is fused, or a notched portion is provided by cutting out by a fusing seal. As the size of the throttle part, it is preferable that the depth of the notch is about 1/3 to 1/5 of the length of the base. Further, if necessary, a gripping hand hole and a strapping hole are cut out on the upper side by punching or the like. The size of the prismatic bag is arbitrary, but it is usually easy to handle when the size of the bottom surface is a square having a side of about 5 to 50 cm and a height of about 5 to 70 cm. Here, if the gussets are formed so close that the inner ends are almost in contact with the gussets at both side edges, the prismatic bag has a substantially square bottom surface and is excellent in self-supporting property.

  The square bottom bag of the present invention can be manufactured without using an inflation tube. For example, a gusset serving as a side wall is folded between two films serving as a front film and a back film and the ends are fused together to form a gusset bag or a square-bottom bag having a rectangular bottom surface. Alternatively, both ends of one film may be fused to form a tube, and then the gusset may be formed. At this time, the fused portion may be on the side edge portion or in the front or back film.

Next, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a plan view when the square bottom bag of the present invention is folded (when empty), and FIG. 2 is a perspective view when contents are put in the bag. This square bottom bag is formed using an inflation tube, provided with a corner seal of about 45 degrees, and the outside of the corner seal is cut. In FIG. 1, a gusset portion 3 that is folded inward between a front film 1 and a back film 2 and a constricted portion 4 that is cut out in a semicircular shape and fused at the periphery are provided at the upper portions of both side edges. Although the shape of the throttle part 4 is arbitrary, a part of an arc or an elliptical arc is preferable from the viewpoint of ease of charging the contents, and from the viewpoint of use as a string or a gripping part for sealing the upper side 5, a half of the arc or the elliptical arc is used. A shape in which the above remains is preferable.
The upper side 5 may be further provided with a hand hole 6 for gripping, a strap 8 for tying, or a cutting auxiliary line such as a perforation for cutting on the upper side. In this case, the binding string 8 can seal the square bottom bag with the upper side 5, but it is preferable to fold the upper side 5 and bind the throttle part 4 from the viewpoint of further exerting the effect of the present invention. . Moreover, it is also suitable to tie up an aperture | diaphragm | squeeze part using the cut-out upper side. FIG. 3A is a plan view in which a gripping hand hole 6 is drilled, and FIG. 3B is a perspective view thereof. 4 (a) is a plan view in which a through-hole 7 for a tied string is perforated, FIG. 4 (b) is a perspective view in which the string 8 is passed through the through-hole 7, and FIG. FIG. FIG. 5A is a plan view showing a state of the perforation 9 for cutting provided on the upper side 5, and FIG. 5B is a plan view showing a state of cutting the upper side 5 from the perforation 9 for cutting. (C) is a perspective view of a state in which the throttle part 4 is bound using the cut upper side 5.
When the square bottom bag is opened, the gusset 3 becomes a side wall as shown in FIG. 2, and the triangular portions of the lower portion of the gusset and the front film 1 and the back film 2 form a substantially square bottom surface, Become.
Moreover, you may fuse the ridgeline of the four corners of a prismatic trunk | drum film. Such a configuration improves the ease of folding and the independence.
In use, the contents such as dust may be introduced from the upper opening, and the opening has the same opening shape as the bottom surface, so that the contents such as dust are easily introduced. Even if the bag falls down due to the squeezed portion, the contents put in are hardly spilled, and for sealing, the aperture may be closed by tying the squeezed portion with the upper side of the square bottom bag or a string. Alternatively, complete sealing can be easily performed by heat-sealing the throttle portion. Since the upper side projects from the top of the aperture, it is easy to carry. FIG. 6 is a plan view of a folded state of another embodiment of the square bottom bag according to the present invention. In the square bag, a substantially square bottom film is folded and inserted between the front film and the back film as a bottom gusset and fused to the front film and the back film.

  The bag according to the present invention is self-supporting, and since the opening is wide, it is easy to input the contents, and even if the bag falls down during use, the contents are not easily spilled. Suitable for storage bags, garbage bags, etc.

Top view when the bag according to the present invention is folded (when empty) The perspective view at the time of putting the contents in the bag concerning this invention (A) Top view when a hand hole for gripping is drilled in the upper side of the square bottom bag according to the present invention (b) Perspective view when a hand hole for gripping is punched in the upper side of the square bottom bag according to the present invention (A) Top view when a strapping hole is punched on the upper side of the square bottom bag according to the present invention (b) A string is attached to the strapping hole provided on the upper side of the square bag according to the present invention. (C) The perspective view which folded the upper side and united it using the string attached to the upper side of the square bottom bag concerning this invention (A) The top view which shows a mode that the perforation for cutting was attached to the upper side of the square bottom bag concerning this invention (b) The top view which shows a mode that the top side of the square bottom bag concerning this invention was cut | disconnected from the perforation for cutting (C) The perspective view which shows a mode that the aperture | diaphragm | squeeze part was bundled using the upper side which the square bottom bag concerning this invention cut off. The top view when the other example of the square bottom bag concerning this invention is folded.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front film of bag 2 Back film of bag 3 Gusset 4 Constriction part 5 Upper side 6 Hand hole for holding 7 Passing hole for tying string 8 Tying string 9 Perforation for cutting

Claims (6)

A square-bottom bag comprising a gusset on both side edges, a bottom face of a square bag, and a narrowed portion formed by cutting out the side edges. The square bottom bag according to claim 1, wherein the bag having a square bottom surface is a gusset bag, and a corner seal is provided at a lower corner. The square bottom bag according to claim 2, wherein an outer side of the corner seal is cut. The square bottom bag according to any one of claims 1 to 3, wherein the bottom surface is substantially square. The square bottom bag according to any one of claims 1 to 4, wherein a string is attached to the upper side. The square bottom bag according to any one of claims 1 to 4, further comprising a perforation for cutting off the upper side.

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