JP2575175Y2 - Packaging bag for powder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for powder which mainly contains powder such as meriken powder and cement.

[0002]

2. Description of the Related Art Conventionally, this type of multi-layer bag has a structure in which, when forming the bottom, the inner layer is sequentially folded to polymerize the folded portion and a gum tape is adhered to the outer surface thereof. Therefore, since the molding is performed manually, the operation is inefficient, and furthermore, the bottom cannot be completely sealed, and there is a problem that the powder inside leaks out during handling.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to ensure that the bottom is securely sealed and the An object of the present invention is to provide a powder packaging bag that does not leak.

[0004]

In order to achieve the above-mentioned object, a powder packaging bag according to the present invention is provided with a single bottom-forming piece protruding from a lower end edge on an inner surface of a rear side portion of a cylindrical bag body. And the left and right side edges of the bottom forming piece are adhered to the inner surface of the bag body, and the protruding portion is folded in so that the front end edge overlaps the front lower end edge of the tubular bag body, and One or a plurality of synthetic resin thin strings are adhered from the front end to the rear end at the center of the back surface, and a plurality of thin strips are adhered at predetermined intervals from the top edge of the superposed surface. The left and right sides of the lower end of the tubular bag are further bent together with the bottom forming piece to form triangular folds, and the left and right triangular folds are bent inward from predetermined positions to form the tubular bag. A packaging bag for powder in which a front lower end and a rear lower end are alternately folded, and a gum tape is stuck thereon.

[0005]

The bottom of the bottom forming piece is folded in, the tip is overlapped with the front lower edge of the tubular bag, and a predetermined distance from the top of the overlapping surface is adhered to each other to form the bottom. If the entire periphery of the piece is stuck, and the left and right sides of the lower end of the bag together with the bottom forming piece are bent to form triangular folds, and then the front lower end and the rear lower end are folded in, the cylinder becomes The bottom forming piece superimposed on the inner surface of the bag-like body covers the entire bottom of the bag body from the inside, and if the adhesive tape is stuck on the folded front lower end and the rear lower end, the bag is complete. And the stored powder has no room for leakage. Also, since one or a plurality of synthetic resin thin strings are adhered from the front end to the rear end of the protruding portion of the bottom forming piece from the front end to the rear end, the synthetic resin thin string is pulled when this portion is pulled. The protruding portion of the bottom forming piece is easily torn along the opening so that the stored powders can be easily taken out.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes a cylindrical bag formed of kraft paper, which is represented by one sheet in the figure. Usually, two or three sheets are stacked to form a multilayer bag. One bottom forming piece 2 is overlaid on the inner surface of the rear side of the tubular bag 1. The left and right measuring edges of the bottom forming piece 2 are formed to have the same width as the inner surface of the rear side portion of the bag 1 or FIG.
As shown in the figure, it is formed slightly wider and attached to the inner surface of the rear side,
One end is made to protrude longer than the bag body 1 and
is bent so that the leading edge 2b overlaps the front lower edge 1a of the bag 1 (see FIG. 5). One or more thin synthetic resin strings 3 are adhered from the front end to the rear end at the center of the back surface of the projection 2a, and the entire periphery of the projection 2a is spaced apart from the top edge of the overlapping surface of the projection 2a by a predetermined distance. Are adhered to each other 4 and, in this state, the right and left sides of the lower end of the bag 1 are folded in a triangular shape to form triangular folded portions 5 and 6. Then, the front lower end 1b is folded inward from the fold 7 (see FIG. 6) at the middle of the triangular folds 5 and 6, and then the rear lower end 1c is folded at the middle fold 8
The bottom is further bent to form a bottom as shown in FIG. 1, and a gum tape T is stuck thereon to complete. Reference numeral 9 in the figure denotes a cut provided along the thin synthetic resin string 3 at the tip of the protruding portion 2a.

[0007]

According to the present invention, the cylindrical bag body has a bottom inner surface surrounded by a bottom forming piece, and the entire periphery of the bottom forming piece is adhered to the bottom inner surface of the cylindrical bag body. Is completely sealed and there is no danger of leakage of the powder inside.
When the tip of the center of the protruding portion of the bottom forming piece is pinched and pulled with a fingertip, it can be easily opened as shown in FIG.

[Brief description of the drawings]

FIG. 1 is a bottom front view in a flat state.

FIG. 2 is a bottom perspective view in a use state.

FIG. 3 is an enlarged vertical sectional view of FIG. 2;

FIG. 4 is an enlarged cross-sectional plan view of a part of FIG. 2;

FIG. 5 is a longitudinal sectional side view showing a bent state of a protruding portion of a bottom forming piece.

FIG. 6 is a front view of the bottom part during bag making.

FIG. 7 is a perspective view showing a state where a bottom is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical bag 1a Front lower edge 1b Front lower edge 1c Rear lower edge 2 Bottom forming piece 2a Projection 2b Front edge 3 Synthetic resin thin string 4 Adhesion 5 Triangular fold 6 Triangular fold 7 Fold 8 T gum tape

Claims (1)

(57) [Scope of request for utility model registration] 1. A single bottom forming piece projecting from a lower edge is overlaid on the inner surface of a rear side portion of a cylindrical bag, and left and right side edges of the bottom forming piece are adhered to the inner surface of the bag. At the same time, the protruding portion is folded, the front edge is overlapped with the front lower edge of the tubular bag, and a synthetic resin thin string is formed at the center of the rear surface of the protruding portion from the front end to the rear end by one or a predetermined interval. A plurality of strips are adhered to each other, and the entire periphery at a position spaced a predetermined distance from the leading edge of the overlapped surface is adhered to each other, and further, the bottom left and right sides of the lower end of the tubular bag are bent together with the bottom forming piece. Each triangular fold is formed, the left and right triangular folds are bent inward from a predetermined position, and the front lower end and the rear lower end of the tubular bag are alternately folded,
A packing bag for powder with a gum tape stuck on it.