JPH05147664A - Bag for powder packaging and application thereof - Google Patents

Abstract

PURPOSE:To automate the packaging work of a powder by a wherein at least one opening of an envelope-shaped bag main body, which is made by folding a paper, is sewn by a sewing machine, and a sealing part, for which the bag main body is adhered into a band shape and closed, is formed at least at an inner part of the perforation. CONSTITUTION:When a powder is packaged using a bag main body 1 which is formed into an envelope shape by folding a paper such as a laminate processed paper, etc., for which a resin is coated on the inner surface of a craft paper, one sealed opening (1a) is made to be the bottom side, and a content is filled in the bag from other opening (1b). Then, the opening (1b) is sewn by a sewing machine and closed. Also, in order to reinforce the joining of the opening (1b), preferably, an over tape 4, which covers a perforation 2b and the end part of the opening (1b) together, is adhered to seal the opening (1b). When a powder is taken out by opening this bag, a perforation 2a at one opening (1a), which was made to be the bottom side at the time of powder filling, is pulled to open. Then, an adhered sealing part 3 is peeled by hand to open the opening (1a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag suitable for packing powders such as pigments. By sewn the opening of the bag with a sewing machine and joining the inner portion of the seam, the packaging work is automated. The present invention relates to a bag for powder packaging, which can be opened easily, and a method of using the bag.

[0002]

2. Description of the Related Art Conventionally, as a bag for packaging powder such as pigments, a bag in which paper is folded into an envelope and both openings are sealed by sewing is often used. When powder is attached near the seams when the sewing machine thread is unwound or when the sewing machine sewing portion is cut and removed with scissors, the powder is scattered due to vibration during the opening operation.
There was a possibility that it would lead to pollution of workers and the work environment. Therefore, for example, a powder bag as shown in FIG. 3 is used. This bag is made by folding kraft paper into an envelope. 3
Laminated sheets of blanket bags 11, 12, 13 are sewn together with the openings 11a, 12a, 13a of one of them in a state where all layers are stacked, and the seam 14 and the end of the opening are collectively sewn. An over tape 15 for covering is adhered. Further, the innermost bag 11 forming the innermost layer is preferably formed to have a slightly longer length in the longitudinal direction. When using this bag, after filling the contents into the innermost base bag 11 through the other opening 11b that is not sewn on the sewing machine, the opening 1 of the innermost base bag 1
1b is tied and closed, and thereafter, the openings 12 of the intermediate and outermost bags are so enclosed as to include the closed portion 16 therein.
b and 13b are sewn together by a sewing machine, closed and packaged (reference numeral 17 in the drawing indicates a seam).

[0003]

However, there is a problem in that it is difficult to mechanize the work of binding and closing the opening in this packaging process, and it is necessary to rely on manual work. In this way, it is not easy to tie and close the innermost bag filled with powder by hand, and it is not preferable in terms of working environment, and automation of powder packaging work has been desired. . Furthermore, when opening the packaged bag and using the powder for the purpose, after unsealing the intermediate blanket bag and the outermost blanket in one batch, the closed part of the bound innermost blanket is opened. There is a problem in that work is inefficient and work efficiency is low because it is opened and unsealed.

The present invention has been made in view of the above circumstances, and provides a powder packaging bag which can automate the powder packaging work and can be easily opened when the powder is taken out, and a method of using the bag. The purpose is to do.

[0005]

The powder packaging bag of the present invention is sewn on at least one opening of an envelope-shaped bag body formed by folding a paper, and at least an inner portion of the sewing seam, The means for solving the above-mentioned problems is to form a sealed portion by joining the bag main body in a band shape and sealing it. As a method of using the same, the contents are filled from the other opening of the powder packaging bag, the opening is sewn with a sewing machine to be packaged, and when the bag is opened, the sewing thread of one opening is removed. The seam is released to open the sealing portion, which is the means for solving the above-mentioned problems.

[0006]

The present invention will be described in detail below. FIG. 1 shows an embodiment of the powder packaging bag of the present invention. Reference numeral 1 in the drawing is a bag body. The bag body 1 is formed by folding paper into an envelope shape, and is preferably formed by using laminated paper in which the inner surface of kraft paper is coated with resin. As the resin, those having excellent heat sealability such as polyethylene and polyvinylidene are preferably used.
One opening 1a of the bag body 1 is sewn with a sewing machine and closed. Reference numeral 2a in the drawing indicates a seam. By using the bag-stitching method as the sewing method, when the opening 1a is opened, the sewing thread can be easily removed in the direction from the sewing end to the sewing start direction. At least the sewing seam 2 is provided in the opening 1a.
A sealing portion 3 formed by joining the bag body in a band shape is formed on the inner portion of a. The joining of the sealing portion 3 can be easily performed by heat-sealing the coating resin of the laminated paper forming the bag body 1. The sealing portion 3 may extend to other portions such as the outer portion of the seam 2a, but the seam 2a is preferable in consideration of the convenience of opening.
A strip having a width of 1 to 2 cm is formed on the inner portion of the.

When the powder is packaged using such a bag, the inside of the bag is filled with the sealed one opening 1a as the bottom side and the other opening 1b. After that, the opening 1b is sewn with a sewing machine and closed. Further, in order to strengthen the joining of the opening 1b, preferably, the sewing tape 2b and the over tape 4 which collectively covers the end of the opening 1b are adhered and sealed. Then, when the bag is opened and the powder is taken out, first, the seam 2a of the one opening 1a which is the bottom side at the time of filling the powder is loosened. Then, the joined sealing portion 3 is peeled off by hand to open the opening 1a.

In such a packaging operation, the filling of powder, the sewing of the opening 1b with the sewing machine, and the bonding of the over tape 4 can be performed by a machine. Therefore, by using the bag in which one opening 1a is sewn with the sewing machine and the sealing portion 3 is formed as described above, the powder packaging operation can be automated. Further, the bag is sealed by the sealing portion 3 when the sewing seam 2a of the opening 1a is unsealed when the bag is opened. Then, by peeling off the sealing portion 3 by hand, it is possible to open the powder while preventing the powder from scattering, which is preferable in the working environment.

Although one embodiment of the present invention has been described above, as shown in FIG. 2, a plurality of outer bags 5, 6 formed in an envelope shape in the same manner on the outside of the bag body 1 in the above structure. It is possible to obtain a powder packaging bag having a multi-layer structure in which the above are laminated.
This bag is sewn together with one opening 1a, 5a, 6a in a state in which all layers are stacked, and the bag body 1 forming the innermost layer is formed into a band shape at least at the inner side of the sewing seam 2a. It is joined (sealing part 3). Further, the other openings 1b, 5b, 6b are sewn together by sewing and closed, and preferably an over tape 4 for collectively covering the sewing seam 2b and the ends of the openings 1b, 5b, 6b is adhered. There is. The number of bags to be laminated in such a powder packaging bag can be appropriately set depending on the weight of the contents and the like, and the bag can be increased in strength by having a multiple structure. The sealing portion 3 can be joined not only by heat-sealing laminated paper, but also by using an adhesive. Further, when the powder packaging bag has a multi-layered structure, the sealing portion 3 may be joined using an adhesive and the bag forming the innermost layer may be formed using kraft paper not coated with resin. it can. At this time, it is preferable to form one of the outer bags to be laminated by using laminated paper, which can ensure moisture resistance inside the bag.

As another method of use, the other opening 1b of the bag body 1 is previously sewn with a sewing machine, and more preferably, an over tape is formed in a bonded state.
After filling the contents from one opening 1a with b as the bottom side, the opening 1a can be sewn with a sewing machine and the inner portion of the seam 2a can be joined by fusion or adhesion. Then, when opening, the seam 2a of the opening 1a can be unfastened and the sealing portion 3 can be peeled off in the same manner as the above method. However, according to this method, the opening 1
When the powder is filled from a, the portion to be fused or adhered on the inner surface of the bag may be contaminated with the powder, so it is necessary to devise a method for filling the powder.

[0011]

As described above, in the powder packaging bag of the present invention, at least one opening of the envelope-shaped bag body formed by folding the paper is sewn on the sewing machine, and at least the inner portion of the sewing seam is sewn. The bag body is joined in a band shape to form a sealed portion. In addition, the method of using the powder packaging bag of the present invention is such that the contents are filled from the other opening of the powder packaging bag, the opening is sewn and packaged, and when the bag is opened, one of The sewing thread is removed from the opening of the sewing machine to release the seam, and then the sealing portion is opened.

Therefore, according to the present invention, the powder packaging work can be mechanized, and the packaging work can be automatically performed without resorting to manual labor. As a result, the working environment can be improved and the productivity can be improved. Further, when the powder is taken out, it can be simply opened and the work efficiency can be improved. Further, it is possible to prevent the powder of the contents from scattering at the time of opening.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a powder packaging bag of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the powder packaging bag of the present invention.

FIG. 3 is a sectional view showing an example of a conventional powder packaging bag.

[Explanation of symbols]

 1 Bag body 1a, 1b Opening 2a, 2b Sewing seam 3 Sealing part

Claims (3)

[Claims] 1. An envelope-shaped bag main body formed by folding a paper sheet is sewn on at least one opening, and a sealing portion is formed by joining the bag main body in a band shape and sealing it to at least an inner portion of the sewing seam. A bag for powder packaging characterized by being formed. 2. A method of using a powder packaging bag, which comprises filling the contents from the other opening of the powder packaging bag and sewing the opening by sewing. 3. When the contents are filled from the other opening of the powder packaging bag and the package is opened by sewing this opening, the sewing thread of one opening is removed. A method of using a bag for powder packaging, which comprises unsealing and then opening a sealing portion.