Gas valve film, preparation method thereof and laminating process

Abstract

The invention belongs to the field of layered materials. A gas valve film is prepared by laminating an outer layer, a middle layer and an inner layer in sequence through co-extrusion and hot pressing,wherein the thickness ratio of the outer layer to the middle layer to the inner layer is (1-3):(3-7):(1-3), and the total thickness is 30-45 microns; the outer layer is first metallocene linear low-density polyethylene; the intermediate layer comprises at least one selected from first metallocene linear low-density polyethylene and second metallocene linear low-density polyethylene; and the innerlayer comprises the following components in percentage by weight: 10-90% of first metallocene linear low-density polyethylene, 10-90% of second metallocene linear low-density polyethylene and 5-50% of polyolefin elastomer. The gas valve film has the advantages of high strength, good transparency, good air tightness and heat resistance, difficult gas leakage and good processing performance, and can be suitable for high-speed inflation equipment and various bag making devices. A laminated air valve film prepared by the laminating process provided by the invention has good flatness, does not slide, does not wrinkle easily, and does not easy leak gas easily.

Description

technical field [0001] The invention belongs to the field of layered materials, and relates to an air valve membrane, a preparation method and a bonding process thereof. Background technique [0002] The traditional air valve membrane ensures its airtightness by increasing the viscosity of the material, resulting in slow inflation speed and low inflation efficiency, which cannot adapt to high-speed inflation equipment; the film has low strength and poor impact resistance, and is easily affected by environmental factors during use. Cracks, leaks, produce waste, pollute the environment, and increase costs; poor production and processing performance, easy to wrinkle and fluff the film during processing, cannot adapt to various bag making equipment, and have a high scrap rate. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an air valve membrane. The air valve film has high strength, good transparency, good air tigh...

AI Technical Summary

Problems solved by technology

[0002] The traditional air valve membrane ensures its airtightness by increasing the viscosity of the material, resulting in slow inflation speed and low inflation efficiency, which cannot adapt to high-speed inflation equipment; the film has low strength and poor impact resistance, and is easily affected by environmental factors during use. Cracks, leaks, waste, pollute the environment, and increase costs; poor production and processing performance, easy to wrinkle and fluff the film during processing, cannot adapt to various bag-making equipment, and have a high scrap rate

Images