JPS6031702B2 - powder granule paper bag - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a powder paper bag for packing powder such as cement or powder, or powder such as grain or fertilizer, particularly to a diamond paper part of the bag body. This invention relates to a powder paper bag equipped with a horizontally movable vertical non-return valve.

[.

} Prior Art and Problems Conventionally, a vertical non-return valve that can move laterally is attached to the lining of the bag body as an effective device that automatically closes the valve using the internal pressure of the contents filled inside the bag body. Bags installed in
No. 71〉.

As shown in FIGS. 1 and 2, the bag has a sealed bottom section 4 and top section 5, which are made up of a cover section 1, a backing section 2, and fold-in side paper sections 3a and 3b provided on both sides. A vertical non-return valve 8 made of a piece of folded paper 7 folded in two is provided in one of the upper corners 6 of A.

Then, the contents are blown into the bag body A together with air through the inlet 9 of the vertical non-return valve 8 provided at the upper corner 6 of the backing section 2 of the bag body A, and the contents are packed inside the bag body A. The vertical non-return valve 8 is sealed by the contents packed therein.

However, since the bag has a valve 8 made up of a piece of folded paper 7 made by folding a piece of paper in half, the pressure applied when inserting the nozzle to spread the contents and injecting the contents is As a result, the valve 8 is damaged.

In particular, there is a problem that the inlet port (opener section) 9 of the valve 8, where force is applied and stress is concentrated, may be damaged. OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a paper bag for powder and granules whose valve is not damaged by spreading during injection or pressure applied at that time. The purpose is to

8. Structure of the Invention The structure of the present invention to achieve the above object is as follows.

That is, in a paper bag for powder granules, which has a horizontally movable vertical non-return valve at the upper corner of the bag body, the vertical non-return valve is replaced by a folded paper piece with a double open end. It is characterized in that a piece of reinforcing paper is provided on the backing paper portion where the vertical non-return valve is located.

Embodiments of the present invention will be described in detail with reference to the drawings.

EMBODIMENT OF THE INVENTION FIG. 3 shows an embodiment of the powder paper bag according to the present invention.

The paper bag for powder and granule of the present invention has a bottom part consisting of a cover part 10, a hair paper part 11, and folded side paper parts 12a and 12b provided on both sides, and one upper part of the bag body B whose upper part is sealed. A vertical non-return valve 18 that is movable laterally is provided at the corner 11a.

The bag body B includes a cover portion 10, fold-in side paper portions 12a and 12b provided on both sides, and the cover sheet affixed to a vertical adhesive portion 15 attached to the fold-in side paper portion 12a slightly protruding from the cover portion 10. It consists of a backing paper section 11 with a paper surface of approximately the same size as section 10, the bottom of which is pasted by bending the lower adhesive section 13 toward the cover section 10, and the top surface is further sealed by pasting reinforcing paper 14. has been done.

On the other hand, in the upper part of the bag body B, the upper glue section 17 is connected to the bag paper section 11.
It is pasted and sealed. As shown in FIG. 6, the vertical non-return valve 18 is composed of a folded piece of paper 16 which is folded in half and has a double Sekiguchi end 16a, and the upper part of the backing paper part 11 is pasted on the vertical adhesive part 15. At this time, the upper adhesive portion 17 is attached to the backing paper portion 11, and the upper adhesive portion 17 is attached to the backing paper portion 11. As shown in FIG. 7, a vertical non-return valve 18 having an air inlet 19 is provided on the inner surface of the upper corner 11a of the bag body B, that is, one upper corner 11a of the hair paper section 11. Further, a reinforcing paper piece 20 is provided in the portion of the backing paper portion 11 where the vertical non-return valve 18 is located to reinforce that portion. In addition, a part 21 of the folded side paper portion 12a at the position where the vertical non-return valve 18 is located is temporarily fixed by dots in the folded state.
The blowing row 9 of the vertical non-return valve 18 is made easy to open when packing powder such as cement and powder, or granular material such as grain and fertilizer, which will be described later. First, such a paper bag for powder and granules is made of
As shown in the developed view of FIG. 4, folding side paper parts 12a and 12b are provided on both sides of the cover part 10, and one folding side paper part 12a is provided with a vertical glue margin part 15, and the other side is provided with a backing paper part 11. Also, prepare two sheets of strong paper with an upper glue margin 17 on the top of the cover section 10 and a lower glue margin 13 on the bottom of the backing paper section 11, and then as shown in FIG. ,
Fold each paper section, and then
The vertical glue portion 15 and the backing paper portion 1 are separated by leaving a partial space between the upper part of the
1 to form the bag body B, and the lower adhesive portion 13 is attached to the cover portion 10 side to seal the lower part of the bag body B.

Next, a separately prepared reinforcing paper 14 is attached to the outside of the area to reinforce the area. Next, between the upper part of the vertical glue portion 15 that is not pasted and the upper part of the backing paper part 11,
As shown in FIG. 6, a piece of paper 1 folded in half has a double Sekiguchi bridge portion 16a, which is the material of the vertical non-return valve 18.
6, and stick one side to the vertical glue portion 15 and the other side to the inside of the hair paper portion 11. Thereafter, it is folded along the bending line 22, and the upper glue margin 17 is attached to the cover part 11 as shown in FIG. 7, thereby sealing the upper part of the bag body B and forming a vertical non-return valve 18. A vertical non-return valve 18 made of a folded paper piece 16 is provided at the upper corner 11a of the bag body B. After that, a piece of reinforcing paper 20 is provided on the outside of the backing paper part 11 of the vertical non-return valve 18 to reinforce this part, and the fold-in side paper part 12 is then attached.
A paper bag for powder and granule is manufactured by folding it into the position having the vertical non-return valve 18 in a and temporarily fixing it with dots while the parts 21 on both sides are folded. When packing powder such as cement, powder, etc., or granules such as grain, fertilizer, etc. into such paper bags, the short nozzle 23 is inserted into the blowing row 9 of the vertical non-return valve 18 as shown in FIG. Then, powder such as cement or powder, or granular material such as grain or fertilizer is blown into the bag body B along with air. At this time, since a part 21 of the folded side paper part 12a corresponding to the position where the vertical non-return valve 18 is located is temporarily secured with a dot, the vertical non-return valve 18 can be easily removed by pressing the upper corner 11a of the paper bag from above. In addition, the inlet end 1 of the inlet 19 of the vertical non-return valve 18
6a is on the side of the folded paper section 12a, so the nozzle 23
can be easily inserted into the vertical non-return valve 18. Therefore, the injection work becomes easy and can be performed efficiently. When the powder or granules packed inside the bag body B are sufficiently filled, the folded side paper portion is temporarily secured by the powder or granules packed inside the bag body B as shown in FIG. Parts 21 on both sides of the folded paper part 12a are peeled off, the folded side paper part 12a is expanded, and the vertical non-return valve 18 is pushed laterally to bring the inside of the backing paper part 11 into close contact, thereby sealing the air inlet 19. As shown in FIG. 10, powder or granules are packed into the bag body B. In this way, the vertical non-return valve 18 is pushed in the lateral direction by the powder or granules itself packed into the bag body B, and brought into close contact with the inside of the backing paper part 11.
Since the valve is automatically sealed and this ensures the seal, subsequent refill operations to ensure the seal of the valve are omitted. This valve 18 is closed particularly in a portion where the powder or granules are sufficiently packed, and the vertical non-return valve 18 is moved toward the backing section 11 by sufficient internal pressure from the packed powder or granules themselves. Since they are brought into close contact, the airtightness of the valve 18 is ensured, and powder or granules will not leak from the bag during transportation or handling. In other words, if the horizontally movable vertical non-return valve 18 is provided at the upper corner 11a, the powder or granules can be sufficiently filled into the bag body B, so that a large amount of extrusion can be achieved by the sufficiently packed powder or granules. The vertical non-return valve 18 is reliably sealed by the action of internal pressure. Therefore, it goes without saying that there is no leakage of powder or granules from the paper bag, and since there is no post-work, the efficiency of the sealing work can be improved. Also,
This is because not only one upper corner 11b of the bag body B but also the other upper corner 11a where the valve 18 which is difficult to pour is provided is sufficiently injected, and the entire bag is sufficiently filled with powder particles. There is no air remaining in the paper bag, and there is no deterioration of the powder granules due to air, and there is no opening of the valve due to degassing of air remaining during transportation or storage stacking.

According to such a paper bag for powder and granules, the vertical non-return valve 18 is constituted by a folded paper piece 16 with a double open end 16a,
Since the reinforcing paper 20 is attached to the part of the backing paper part 11 where the valve 18 is located, the open end 16a and the entire valve 18 are reinforced, and the nozzle can be inserted to remove powder such as cement, powder, or grains.
For spreading when injecting (packing) granules such as fertilizer,
The valve 18 will not be damaged by the pressure applied at that time. In particular, the open end 1 of the valve 8 where forces are applied and stresses are concentrated.
Since 6a is double-layered, it will not be damaged even if a somewhat large force is applied. Although the above-mentioned embodiment shows an example of a paper bag sealed by pasting, it goes without saying that the present invention can be similarly applied to a paper bag sealed by sewing the top and bottom of the bag body with sewing thread.

Effects of the Invention As described above, the present invention comprises a vertical non-return valve made of a folded piece of paper with a double entrance end, and a reinforcing paper piece is provided on the backing paper portion where the vertical non-return valve is located. This prevents the valve from being damaged by spreading during injection and the pressure applied at that time.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional bag; Figure 1 is a plan view thereof, Figure 2 is an enlarged perspective view of the main parts of Figure 1 before stitching, and Figures 3 to 10. 3 shows an embodiment of a powder paper bag according to the present invention, and FIG. 3 is a perspective view of the paper bag;
Figures 4 to 7 show the manufacturing method of paper bags in the order of steps. Figure 4 is a developed view, Figure 5 is a plan view of the bag body formed, and Figures 6 and 7 are subsequent steps. 8 and 9 are enlarged perspective views of the main parts of the paper bag for powder or granules of the present invention, and FIG. FIG. 9 is a perspective view of the main part of the paper bag filled with powder or granules, and FIG. 10 is a perspective view of the entire paper bag filled with powder or granules. 10...Cover section, 11...Back paper section, 1
1a, 11b...Top corner, 12a, 12b.
... Folding side paper part, 15 ... Vertical glue margin, 16 ... Folding paper piece, 16a ... Sekiguchi-like part, 18 ... Vertical non-portion Return valve, 19...
・Inlet, 20...Reinforcement paper piece, B...Bag body. Figure 2 Figure 1 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. In a paper bag for powder granules, in which a horizontally movable vertical non-return valve is provided at the upper corner of the bag body, the vertical non-return valve is
A paper bag for powder and granules, characterized in that it is composed of folded paper strips with double opening ends, and that a reinforcing paper strip is provided on the backing paper section where the vertical non-return valve is located.