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Polythene valve port bag and mfg method thereof

The technology of a polyethylene valve and a manufacturing method, which is applied to the manufacturing field of polyethylene valve pockets, can solve the problems of easy liquefaction at the sticking place, easy hardening at the sticking place, moisture in the package, etc., and achieves good firmness, firm welding, and convenient sealing. Effect

Inactive Publication Date: 2005-05-18
常国华
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its firmness is poor, and it is greatly affected by climate and high and low temperatures. At low temperatures, the paste is prone to harden, peel off, and fall off. cause environmental pollution

Method used

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  • Polythene valve port bag and mfg method thereof
  • Polythene valve port bag and mfg method thereof

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0009] Cut the inner and outer polyethylene cylinder materials 1 and 2 into the length required by the valve pocket, and puncture multiple rows of pinholes 3 evenly and longitudinally on the inner and outer cylinder materials 1 and 2 respectively, and cut the inner and outer polyethylene cylinder materials 1 and 2 with pinholes 3 2 phase sets, so that the pinholes 3 on the inner and outer cylinder materials 1 and 2 are not in the same position, the inner ring 8 of the outer cylinder material at both ends and the outer ring 9 of the inner cylinder material are welded at high temperature respectively, and the two ends of the double-layer cylinder material are long and round The openings are respectively folded into multi-edge geometric upper and lower bottoms 4 and 5 with overlapping layers of base materials, and a layer of fabric 7 with the same ...

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Abstract

A polyethylene valve bag and its manufacturing method is that the inner and outer polyethylene cylinder materials with pinholes are put together so that the pinholes on the inner and outer cylinder materials are not in the same position, and the long round openings at both ends of the double-layer cylinder material are folded into multiple The upper and lower bottom surfaces are geometrically shaped with multiple layers, and a valve port is installed on the short side of the upper bottom surface, and a layer of fabric is pasted on the upper and lower bottom surfaces, and then the lower bottom surface and the lining that are set on the sleeve mold are respectively matched by the heated high-pressure mold. The upper bottom surface of the lining mold is pressure-welded with multiple sides at one time, so as to make a double-layer exhaust double-bottom three-dimensional rectangular polyethylene valve bag. The method is simple and fast, and the manufactured valve bag is firm and durable, easy to seal, good in firmness on the upper and lower bottom, strong in tensile strength, heat and cold resistant, prevents the leakage of the package, and has a long service life.

Description

technical field [0001] The invention relates to a manufacturing method of a plastic packaging bag, in particular to a double-layer exhaust double-bottom three-dimensional rectangular polyethylene valve bag and a manufacturing method thereof. Background technique [0002] At present, the general polyethylene packaging bag is made by sealing one bag mouth in a straight line, and directly tying or sticking or scalding the other bag mouth after loading. It has small capacity and less loading. When feeding, the material is directly loaded from the open bag mouth. The sealing area is large, the sealing is difficult, the pressure on the bag mouth is small, and the seal is easy to break. A polyethylene packaging bag with a wide-band bottom, the bottom of which is mostly pasted with an adhesive. Its firmness is poor, and it is greatly affected by climate and high and low temperatures. At low temperatures, the paste is prone to harden, peel off, and fall off. cause environmental pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C65/74
Inventor 常国华
Owner 常国华
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