JPS636039Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an injection valve device for a packaging paper bag containing powder such as American flour or cement, or granular material such as rice or azuki beans.

This type of packaging paper bag is made by folding a piece of paper into a flat cylinder shape to form a valve cylinder, inserting and fixing the valve cylinder into the polymer adhesive part of the bag body, and extending one side opening end of the valve cylinder to the outside of the bag body. It is made to protrude and the other end is opened inside the bag. When powder or granules are injected into the bag from the valve cylinder, the valve cylinder is sealed by the internal pressure of the contents packed inside the bag. There was a risk that the contents might accidentally leak out during handling. Subsequently, in order to prevent the above-mentioned leakage, injection valve devices disclosed in Japanese Utility Model Application Publication No. 59-28046 and Japanese Utility Model Application Publication No. 59-94043 were developed.

The former is designed to close the tip of the valve barrel by folding a folding piece provided at the tip of the valve barrel into a folding bag, but there are cases where the folding part is easily opened by contact during transportation or handling. There are drawbacks. In addition, the latter has a hot-melt adhesive applied to the inner surface of the tip of the valve barrel, but it has drawbacks such as powder adhering to the adhesive during powder injection and difficult to remove, resulting in poor adhesion. It was hot.

This device was devised with the aim of eliminating the above-mentioned drawbacks of the conventional technology, and was designed to prevent powder from adhering to the adhesive application area during powder injection, and to ensure a secure seal after injection. be.

However, in this device, a strong piece of paper is folded into a flat tube shape to form the valve tube 1, the valve tube 1 is inserted and fixed into the polymerized adhesive part 3 of the bag body 2, and one end of the valve tube 1 is attached to the bag body. In a packaging paper bag in which the body 2 protrudes outward and the other end opens into the bag body 2, cuts 4 are provided at both upper and lower ends of the portion of the valve barrel 1 that protrudes outward from the bag body 2.
4' is provided to divide the protrusion end into front and rear side parts 1a and 1b, and short cuts 5 and 5' are provided at right angles at the ends of the cuts 4 and 4', and the front side part 1
This is an injection valve device for a paper bag for packaging powder or granules, which is made by applying a hot-melt adhesive 6 to the inner surface of the bag. In the illustrated embodiment, when inserting and fixing the valve cylinder 1 into the overlapping adhesive part 3 of the bag body 2, the notches 5 and 5' are positioned inside the non-adhesive edge 3' of the overlapping adhesive part 3, and the valve cylinder 1 is After sealing with adhesive, the non-adhesive edge 3' is further adhered to the bag body 2, so that the notches 5 and 5' are completely covered.

Since this device has the above structure, when injecting the powder, the front part 1a of the valve cylinder 1 is folded back outward so that the surface to which the adhesive 6 is applied is turned outward, so that the powder adheres to the adhesive 6. It is possible to prevent this from happening. Therefore, after injection, hot air is blown onto the adhesive 6.
By melting the adhesive and gluing the front part 1a to the rear part 1b, the mouth of the valve cylinder 1 can be reliably sealed, and even if powder adheres to the adhesive part 6 during injection, it will not be completely sealed when hot air is blown. can be removed.

Furthermore, in this invention, short notches 5 and 5' are provided at the ends of both the upper and lower notches 4 and 4' of the valve barrel 1, so there is no risk of the upper and lower folded portions of the valve barrel 1 being cut and damaged during injection.

[Brief explanation of the drawing]

The drawings show an embodiment of the injection valve device for powder and granule packaging paper bags according to this invention, and Fig. 1 is a perspective view, and Fig. 2 is a partially enlarged view showing the fixed state of the valve barrel. A sectional view, FIG. 3 is a plan view showing the valve barrel in an expanded state, and FIG. 4 is a perspective view of the valve barrel. 1... Valve cylinder, 1a, 1b... Front and rear side parts, 2...
Bag body, 3...polymerization adhesive part, 4, 4', 5, 5'...
Notch, 6...Adhesive.

Claims (1)

[Scope of utility model registration request] The valve sleeve 1 is formed by folding a strong piece of paper into a flat tube shape, and the valve sleeve 1 is inserted and fixed into the polymerized adhesive part 3 of the bag body 2, and one side opening end of the valve sleeve 1 is attached to the outside of the bag body 2. In the packaging paper bag, which has the other end protruded into the bag body 2, cutouts 4 and 4' are provided at both upper and lower ends of the portion of the valve barrel 1 that protrudes outward from the bag body 2 to form a protrusion opening end. is divided into front and rear side parts 1a and 1b, short cuts 5 and 5' are provided at right angles at the ends of the cuts 4 and 4', and a heat-melting adhesive 6 is applied to the inner surface of the front side part 1a. Injection valve device for powder and granule packaging paper bags.