JP2007276978A - Sewing structure and sewing method in bonded part of sheet, packing bag sewn in bonded part of such a sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further surely prevent mixing of dust from a seam part in a bonded part of a sheet such as a packing bag, by putting a seam without exposing from both directions in the bonded part of the sheet, in the packing bag and its manufacturing method used when compressively packing, for example, cotton, in a sewing structure and a sewing method in the bonded part of the sheet, the packing bag composed of the sewing structure in the bonded part of such a sheet and a packing bag manufacturing method performed by using the sewing method of the bonded part of such a sheet. <P>SOLUTION: This sewing structure in the bonded part of at least two sheets is characterized by sewing three members of the bonded parts of unfolded one sheet and the other sheet and an end part of folded one sheet by folding back an end part of bonding one sheet and an end part of the other sheet, and sewing two members of the end part of the folded one sheet and the end part of the other sheet in a position separate from a position for sewing the three members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sewing structure and a sewing method at a joint portion of sheets, a packing bag constituted by a sewing structure at such a joint portion of sheets, and a packing made by using a sewing method of such a joint portion of sheets. The present invention relates to a bag manufacturing method, for example, a packing bag used when compressing and packing cotton or the like, and a method for manufacturing the same.

  Generally, as a bag for this type of compression packaging, a synthetic resin film is bonded to the inside of a base fabric based on a woven fabric using warp and weft as a flat yarn such as polypropylene and polyethylene by a hot melt method. Or the bag-shaped thing which laminated | stacked the film on the base material woven fabric by the extrusion lamination method is used. Such a bag for compression packing bears the repulsive stress of cotton, which is an item to be packed, on the outer woven fabric, and since the film is provided on the inner side, the film exhibits a waterproof effect. The inner cotton is protected and the flexibility of the film makes it very good in terms of work.

  Conventionally, for example, patent applications such as Patent Document 1 and Patent Document 2 below have been filed as such packing bags.

JP 2005-47610 A JP 2000-272671 A

  By the way, the cotton as described above packed in such a packing bag is used for a sanitary pad, for example. In such a case, since it is generally composed of a synthetic resin such as polypropylene, it is easily charged with static electricity. , Dust and foreign matters in the air are likely to adhere. Therefore, it is necessary to prevent dust and foreign matters from entering the packing bag as much as possible. However, as shown in the drawings of Patent Documents 1 and 2 above, this type of packaging bag is formed by joining at least two sheets. A seam is inevitably formed in the portion, and dust or the like may be mixed from the seam.

  More specifically, in this type of packaging bag, as shown in FIG. 8, a method of sewing the edges of the sheets 3c and 3d facing each other with a thread 7c, or as shown in FIG. A method is employed in which the end portions of the facing sheets 3c and 3d are bent, and the bent end portions 6c and 6d and the four members of the sheets 3c and 3d are sewn with a thread 7c.

However, in the sewing structure as shown in FIG. 8, the thread 7c passes through the two sheets 3c and 3d facing each other to form a seam. In the sewing structure as shown in FIG. Since the thread 7c passes through the four sheets 3c and 3d facing each other and the folded end portion 6c and end portion 6d, a seam is formed. Also in the case of this sewing structure, the seam in the joint portion is penetrated, and the seam is exposed on either the outer side or the inner side of the joint portion of the sheet.

  Accordingly, it has not been possible to suitably prevent the possibility of dust and the like entering the bag from the outside of the packing bag through the seam portion. As a result, there has been a problem that dust or the like mixed in the packing object such as cotton in the packing bag may be attached and the packing object may become unsanitary.

  The present invention has been made in order to solve such a problem, and the seam in the joint portion of the sheet is not exposed from both directions, and thereby in the joint portion of the sheet such as a packing bag. It is an object to more reliably prevent dust and the like from entering from a seam portion.

  In order to solve such problems, the present invention has been made as a sewing structure and a sewing method at a joint portion of sheets, a packing bag sewn at the joint portion of such a sheet, and a manufacturing method thereof. The invention according to claim 1 relating to the sewing structure in the joint portion is a sewing structure in the joint portion of at least two sheets, and the end portion of one sheet to be joined and the end portion of the other sheet are folded back. At the position where the three parts of the joined portion between the one sheet not folded and the other sheet and the end of the folded one sheet are sewn and separated from the position where the three are sewn. The two end portions of the folded one sheet and the other sheet end are sewn.

  The invention according to claim 2 relating to a method for sewing a joint portion of sheets is a method for sewing a joint portion of at least two sheets, wherein one sheet is joined to the other sheet, and the one sheet is joined. The end of the sheet is folded back to the side opposite to the joint surface with the other sheet, and the end of the folded sheet is sewn into one of the unfolded sheet and the other sheet, The end of the other sheet is folded back to the outside of the end of the folded one sheet, and the two of the folded end of the one sheet and the end of the other sheet are The sewing is performed at a position separated from the position where the sewing machine is sewn.

  Furthermore, the invention according to claim 3 according to the packaging bag, in the packaging bag in which the bag body is composed of at least two sheets, the end of one sheet to be joined and the end of the other sheet are folded, In a position where three members of the joined portion of one sheet not folded and the other sheet and the end of the folded one sheet are sewn, and separated from the position where the three members are sewn, Two of the folded back end of one sheet and the end of the other sheet are sewn, and the other sheet is reversed from the sewing part of the three sheets to the opposite side of the one sheet. It is characterized by being extended.

  Furthermore, the invention according to claim 4 relating to the method for producing a packaging bag is a method for producing a packaging bag in which the bag body is composed of at least two sheets, wherein one sheet is joined to the other sheet, The end of one sheet is folded back to the side opposite to the joint surface with the other sheet, and the end of the folded one sheet, the one sheet that is not folded, and the other sheet are sewn together. Then, the end of the other sheet is folded outside the end of the folded one sheet, and the two of the folded one sheet end and the other sheet end are Sewing at a position separated from the position where the three members are sewn, and then reversing the other sheet starting from the sewing part of the three members, and extending to the opposite side of the one sheet for manufacturing. It is characterized by.

In the present invention, as described above, of at least two sheets, the end of one sheet to be joined and the end of the other sheet are folded back, and one sheet and the other that are not folded back. The end portion of the folded one sheet at a position separated from the position where the three portions of the joint portion with the sheet and the end portion of the folded one sheet are sewn and the three members are sewn. And the other end of the sheet are sewn, so that these two sewn portions have seams only on either the outer side or the inner side, No seam is present, and therefore, the two seams do not penetrate, so that dust, foreign matter, etc. pass from one side of the sheet joint to the other side through the seam. There is nothing.

  Therefore, when the sewing structure at the joint portion of the sheet as described above is applied to the packaging bag, dust and the like can be reliably prevented from entering the inside of the bag from the seam portion at the sheet joint portion of the packaging bag. Can do.

  As a result, when the article to be packed is cotton or the like, it is possible to suitably prevent dust and the like from being attached, and the hygiene aspect can be maintained.

  Hereinafter, first, embodiments of a packaging bag will be described with reference to the drawings. As shown in FIGS. 1 to 3, the packaging bag 1 of the present embodiment has an opening 2 on the upper surface and is formed in a substantially box shape as a whole.

  As shown in FIGS. 2 and 3, the packaging bag 1 is configured by sewing two sheets 3 a and 3 b at a joint portion 5 joined at a side edge portion 4 a and a bottom edge portion 4 b. As described above, as a result of the two sheets 3a and 3b being sewn at the side edge portion 4a, the side surface of the packaging bag 1 is formed in a gusset shape.

  As shown in FIG. 4, the two sheets 3 a and 3 b each have a configuration in which a synthetic resin film 10 is bonded to a synthetic resin cloth 8 via a laminate layer 9. The cloth 8 made of synthetic resin is woven with warp and weft made of flat yarn or split yarn such as polypropylene or polyethylene. As the material of the laminate layer 9 and the synthetic resin film 10, for example, polypropylene or polyethylene is used.

  The structure of the joint 5 of the sheet as described above is shown in more detail in FIG. That is, in the joint portion 5, as shown in the figure, the end portion of one sheet 3 a is folded and the other sheet 3 b is overlapped on the outside of the end portion of the one sheet 3 a. The three ends of the one sheet 3a and the other sheet 3b and the folded end portion 6a of the one sheet 3a are sewn and integrated with a thread 7a, and the thread At the position separated from the portion sewn with 7a, the end 6a of the one sheet 3a and the end 6b of the other sheet 3b are sewn and integrated with the thread 7b.

  As shown in FIG. 5, the other sheet 3b is inverted from the portion where the three members are sewn with the thread 7a, and is extended to the opposite side of the one sheet 3a. Thus, the packaging bag 1 as shown to FIG. 1 thru | or 3 is comprised by one sheet | seat 3a and the other sheet | seat 3b sewn in two places in the junction part 5. FIG.

And when manufacturing the packaging bag 1 which consists of such a structure, as above-mentioned, two sheets 3a and 3b are sewn so that the junction part 5 may be formed in the side edge part 4a and the bottom edge part 4b. Will be manufactured.

  The process of sewing the joint 5 will be described. First, as shown in FIG. 6, one sheet 3a and the other sheet 3b are overlapped, and the end of one sheet 3a is folded from that state, and one sheet 3a is folded. The three members 3a, the other sheet 3b, and the folded end 6a of the one sheet 3a are sewn with a thread 7a.

  Next, as shown in FIG. 7, the end of the other sheet 3b is folded back so as to be overlapped with the outside of the end of the one sheet 3a. Then, with the end portion of the other sheet 3b folded back, the end portion 6a of one sheet 3a and the other end of the other sheet 3b are separated from the portion sewn by the thread 7a as shown in FIG. The two end portions 6b of the sheet 3b are sewn with the thread 7b.

Thereafter, as shown in FIG. 5, the other sheet 3b is reversed from the portion where the three members are sewn with the thread 7a, and is extended to the opposite side of the one sheet 3a. by this,
One sheet 3 a and the other sheet 3 b are sewn at two locations of the joint portion 5. And such a junction part 5 is formed in the side edge part 4a and the bottom edge part 4b of both sheets 3a, 3b, and both the sheets 3a, 3b are integrated thereby, and the packaging bag 1 is manufactured. It becomes.

  In this case, as shown in FIG. 5, the three joined portions of one sheet 3a and the other sheet 3b sewn with the thread 7a and the end portion 6a of the one sheet 3a are reversed from the joined portions. The other sheet 3b thus formed is covered and hidden from the inner surface side of the packaging bag 1, and the folded end 6a of one sheet 3a and the folded end of the other sheet 3b sewn with the thread 7b. The two joint portions with 6b are in a state of being covered and concealed from the inner surface side of the packaging bag 1 by one sheet 3a.

  That is, the sheets 3a and 3b are sewn with the thread 7a and the thread 7b at two different positions in the joint portion 5, and the sewn portions are formed in a four-layer structure and a three-layer structure, respectively. In the four-layer structure part, the thread 7a is penetrated only by the three persons and not in the other one layer, and in the three-layer structure part, the thread 7b is penetrated only by the two persons. In any case, the stitches are not penetrated at the sewing positions of the two yarns.

  Accordingly, dust and foreign matter do not inadvertently enter the inside of the packaging bag 1 from the outside through the stitches sewn with the threads 7a and 7b as described above. As a result, for example, even when the article to be packed packed in the packing bag 1 is, for example, cotton for sanitary pads or the like, the structure of the joint portion 5 sewn with the two threads 7a and 7b is the above. Since the stitches by the threads 7a and 7b are not penetrated, dust or the like does not inadvertently enter from the stitches, and the cotton to be packaged is charged with static electricity. Even if it is tinged, dust does not adhere to the cotton.

  In the above embodiment, the sheets 3a and 3b are composed of three layers of the synthetic resin cloth 8, the laminate layer 9, and the synthetic resin film 10. However, the structure of the sheets 3a and 3b is not necessarily the same as that of the embodiment. It is not limited.

  Also, the material of the sheet is not limited to the polypropylene or polyethylene of the above embodiment.

  Further, in the above embodiment, the two sheets 3a and 3b are sewn at the joint portion 5 joined at the side edge portion 4a and the bottom edge portion 4b to form a gusset on the side surface, and the opening portion 2 is provided on the upper surface. Although the packaging bag 1 was formed so that the whole became a substantially box shape, the shape and structure of the packaging bag 1 are not limited to this embodiment.

  Moreover, although the case where the packaging bag 1 was comprised with two sheets 3a, 3b was demonstrated in this embodiment, it is not restricted to this but can also be comprised with three or more sheets.

  Furthermore, although the said embodiment demonstrated the case where the cotton used for a sanitary pad etc. was packed, the kind of to-be-packaged item is not limited to the said embodiment, The kind is not ask | required.

  Further, in the above-described embodiment, the case where the sheet bonding structure is applied to a packaging bag has been described. However, the sheet bonding structure of the present invention can be applied to a bag other than the packaging bag, and further uses other than the bag. It is also possible to apply to.

The schematic plan view of the packaging bag of one Embodiment. The schematic side view. The schematic bottom view. The principal part expanded sectional view which shows the structure of a sheet | seat. The principal part expanded sectional view which shows the structure of the junction part vicinity of a packaging bag. The principal part expanded sectional view of the process which is one manufacturing process of a packaging bag, and bends the edge part of one sheet | seat and sews 3 persons. The principal part expanded sectional view of the process which is one manufacturing process of a packaging bag, and bends the edge part of the other sheet | seat and sews 3 persons. The principal part expanded sectional view which shows an example of the structure of the vicinity of the conventional junction part. The principal part expanded sectional view which shows the other example of the structure of the vicinity of the conventional junction part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packing bag 3a, 3b ... Sheet 5 ... Joining part 6a, 6b ... Bending edge part 7a, 7b ... Yarn

Claims (4)

  It is a sewing structure at a joint portion of at least two sheets, and an end portion of one sheet to be joined and an end portion of the other sheet are folded back, and the unfolded one sheet and the other sheet are joined. And the end of one of the folded sheets and the end of one of the folded sheets are sewn, and the positions of the folded one sheet and the other sheet are separated from the position where the three are sewn. A sewing structure in a joint portion of a sheet, characterized in that two members with an end portion are sewn.   A method of sewing a joint portion of at least two sheets, joining one sheet and the other sheet, folding an end portion of the one sheet back to a side opposite to a joint surface with the other sheet, The end part of one folded sheet, the one sheet not folded and the other sheet is sewn, and then the other sheet end is joined to the end of the folded one sheet. The sheet is folded back to the outside, and the end of the folded one sheet and the end of the other sheet are sewn at a position separated from the position where the three members are sewn. How to sew joints. In a packaging bag in which the bag body is composed of at least two sheets, the end of one sheet to be joined and the end of the other sheet are folded back, and the unfolded one sheet and the other sheet The joined portion and the end of one folded sheet are sewn, and the end of the folded one sheet and the other sheet are separated from the position where the three are sewn. The two with the end of
Moreover, the packaging bag is characterized in that the other sheet is reversed and extended to the opposite side of the one sheet starting from the sewing part of the three parties.   A method of manufacturing a packaging bag in which a bag body is composed of at least two sheets, wherein one sheet is joined to the other sheet, and an end of the one sheet is opposite to a joining surface with the other sheet Folded to the side, the end of the folded one sheet, the one sheet not folded and the other sheet was sewn, and then the end of the other sheet was folded back Folded to the outside of the end of one sheet, and sewed the end of the folded one sheet and the end of the other sheet at a position apart from the position where the three were sewn, Thereafter, the other sheet is reversed starting from the sewing part of the three parties, and extended to the opposite side of the one sheet, and is manufactured.

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