Valve bag

Abstract

The invention provides a valve bag, belongs to the technical field of machinery, and solves the problem that conventional valve bags are prone to leakage during powder filling. The valve bag comprises a bag body with a bag opening and a valve port formed in the bag opening, wherein the valve port is tubular, and is formed through overlapping the two ends of a long flake-like connecting piece; the edge, near the end part of the bag body, of the valve port is bended outwards and in the axial direction of the valve port to form a first bending part; a second bending part with the orientation opposite to the first bending part is arranged at the bag opening of the bag body; a limiting groove is formed between the second bending part and the inner side wall of the bag body; the first bending part is positioned in the limiting groove; the second bending part leans against the first bending part, and is fixed to the first bending part through a bonding method; the second bending part and the bag body are an integral structure. The valve bag has the advantage that the leakproofness of the connection of the bag body and the valve port during the process of powder filling can be maintained.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a valve bag. Background technique [0002] Valve bag, commonly known as sticky bottom bag, is a popular packaging bag in the world at present. It is fed from the top or bottom valve port. It adopts special filling equipment. After filling the material, it is packed into a cube. The stacking is neat and beautiful. Valve bags are mainly used for packing food powder, chemical powder, fertilizer, synthetic materials, explosives, grain, salt, minerals and other powdery or granular solid materials and flexible items. [0003] Existing valve pockets, such as an all-plastic valve pocket for placing silica submitted by the applicant [Application No.: 201420529119.3; Application Publication No.: CN204150375U], include a cylindrical valve port and a rectangular section The main body, the two parallel sides on the top surface of the main body are respectively connected with sheet-shaped conn...

AI Technical Summary

Problems solved by technology

But there is a problem in this valve bag: the powder is poured into the bag body at a relatively high speed, which has a certain impact on the bag body, making the bag body have a tendency to separate from the valve port; at the same time, when the bag body expands, the bag body also Has a tendency to disengage from the valve port

Under the influence of the two factors mentioned above, when the powder is poured, there is a high probability that there will be a gap between the valve port and the bag body. Since the volume of the powder is extremely small, as long as there is a gap between the valve port and the bag body, there will be a gap between the valve port and the bag body. The gap (whether it is large or small) will cause powder leakage and affect the powder loading into the valve pocket

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