JP3054702U - Powder packaging paper bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder packaging paper bag capable of securely sealing a powder injection port of a cylindrical injection valve provided in a bag main body. A cylindrical injection valve is provided at the upper end corner between the overlapped paper portion and the tip of the injection valve protrudes outward from the overlapped paper portion, and a hot-melt adhesive is applied to the inner surface of the cylindrical injection valve. In the powder packaging paper bag, a hot-melt adhesive is applied to the surface of the protruding tip of the cylindrical injection valve, and the protruding tip is folded back to be heated and adhered to the bag body.

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper bag for storing powder such as flour.

[0002]

2. Description of the Related Art A powder packaging paper bag of this kind is disclosed in Japanese Utility Model Publication No. 61-26193. In the above, the tip of the cylindrical injection valve provided on the bag body is protruded from the bag body, and the inner surface of the protruding tip is coated with a hot-melt adhesive. Therefore, when the powder is filled in the bag body, the powder adheres to the surface of the hot-melt adhesive, so that there is a problem that it cannot be completely sealed at the time of heating and bonding after the filling.

[0003]

[Problems to be Solved by the Invention] The present invention is intended to solve the above-mentioned problems, and is intended to reliably seal the mouth of the cylindrical injection valve after filling the bag body with powder. It is another object of the present invention to provide a powder-packed paper bag.

[0004]

The means of the present invention are as follows. A tubular injection valve is provided at the upper end corner between the vertical glue margin on one side of the bag body and the overlapped paper section, the tip of which is projected outward from the overlapped paper section, and In a powder wrapping paper bag coated with a hot-melt adhesive on the side surface, a hot-melt adhesive is applied to the surface of the protruding tip of the cylindrical injection valve, and the powder is filled. Bends in the direction and heat adheres to the bag body.

After the protruding tip of the cylindrical injection valve is heated and the inner surface is bonded, a hot-melt adhesive is applied to the surface, and a cut is made in the upper paper at the base of the protruding tip to perform powder injection. The entrance was formed.

Further, the upper paper at the protruding tip of the cylindrical injection valve is cut off to expose the hot-melt adhesive applied to the inner surface to the surface.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes a bag body formed of kraft paper in multiple layers, and 2 denotes a cylindrical injection valve to which a hot-melt adhesive 3 is applied on the inner surface. Then, the cylindrical injection valve 2 is adhered to the upper end corner of one side of the bag body 1 between the vertical glue margin 4 and the overlapped paper section 5, and the front end 2 a is directed outward from the overlapped paper section 5. Protrude. In the embodiment shown in FIG. 1, the surface of the protruding tip 2a of the cylindrical injection valve 2 is coated with a hot-melt adhesive 6, and after the bag body 1 is filled with powder, the protruding tip 2a is placed inside. The protruding tip 2a is bonded to the bag body 1 as shown in FIG.

In the embodiment shown in FIG. 3, the protruding tip 2 a of the cylindrical injection valve 2 is heated and adhered to the inside with the hot-melt adhesive 3. And a cut 7 is provided in the upper sheet of paper at the base of the protruding tip 2a to form a powder inlet 8 (see FIG. 4).

In the embodiment shown in FIG. 5, the upper sheet of the protruding tip 2a of the cylindrical injection valve 2 is cut off to expose the hot-melt adhesive 3 applied on the inner surface to the surface. is there.

[0010]

According to the present invention, a hot-melt adhesive is applied to the surface of the protruding tip of the cylindrical injection valve provided on the bag body, the powder is filled into the bag body, and then the cylindrical injection is performed. Since the protruding tip of the valve is folded back inside and heated and bonded to the bag body, the mouth of the cylindrical injection valve can be securely sealed, and there is no danger of leakage of the stored powder.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a sealed state of the cylindrical injection valve.

FIG. 3 is a perspective view showing a second embodiment.

4 (a) is a front view, and FIG. 4 (b) is an enlarged sectional view taken along line AA of FIG. 4 (a).

5 (a) is a front view, and FIG. 5 (b) is an enlarged cross-sectional view taken along line BB of FIG. 5 (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag main body 2 Cylindrical injection valve 2a Protrusion tip part 3 Hot-melt adhesive 4 Vertical glue margin 5 Polymerized paper part 6 Hot-melt adhesive 7 Cut 8 Powder inlet

Claims (3)

[Utility model registration claims] 1. A tubular injection valve is provided at an upper end corner of one side of a bag body between a vertical glue margin portion and a superposed paper portion, the tip of which is protruded outward from the superposed paper portion, and In the powder packaging paper bag coated with a hot-melt adhesive on the inner surface of the injection valve, apply a hot-melt adhesive to the surface of the projecting tip of the cylindrical injection valve,
A powder packaging paper bag, wherein after filling with powder, the protruding tip portion is bent inward to be heated and adhered to the bag body. 2. A protruding tip of a cylindrical injection valve is heated to adhere an inner surface, a hot-melt adhesive is applied to the surface, and a cut is provided in an upper paper on a base of the protruding tip. The powder packaging paper bag according to claim 1, wherein an inlet is formed. 3. The powder package according to claim 1, wherein the upper paper at the protruding tip of the cylindrical injection valve is cut off to expose the hot-melt adhesive applied to the inner surface to the surface. Paper bag.