Seamless welding hose and production method thereof

Abstract

A seamless welded tube and a manufacturing method therefor. The tube comprises a tube body (1). The tube body (1) comprises an inner film (11) and an outer film (12) that are stacked together. The inner film (11) and the outer film (12) are alternately compounded together and respectively form right-angle stepped ports at two ends in the circumferential direction of the tube body (1). The outer surface (111) of the inner film (11) at one of the ports is exposed outside of the outer film (12), while the inner surface (121) of the outer film (12) at the other port is exposed outside of the inner film (11). The inner surface (121) of the outer film (12) that is exposed is lap-welded onto the outer surface (111) of the inner film (11) that is exposed. Also, the two ends in the circumferential direction of the outer film (12) are welded together, while the two ends in the circumferential direction of the inner film (11) are welded together. The manufacturing method comprises: the steps of thin-film manufacturing, thin-film compounding, winding for tube formation, and welding. The inner film (11) and the outer film (12) are alternately compounded together during thin-film compounding. The manufacturing method for the multilayered seamless tube allows for reduced difficulty in a printing process. The tube is smooth and seamless at where same is welded. The tube is provided with an aesthetic overall appearance. In addition, the need for cropping to acquire the right-angle stepped ports is obviated, the manufacturing process flow is simple, and the manufacturing costs for the tube are reduced.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a seamless welded hose made of sheets and a preparation method thereof. Background technique [0002] At present, hoses play an increasingly important role in the packaging of daily cleaning products, cosmetics, food, pharmaceuticals and other products. In the production process of the packaging hose, the traditional molding method of the tube body is extrusion molding, and then the shoulder injection, printing and other processes are completed, and finally the packaging hose is obtained. In extrusion molding, the tube body is integrally formed without welding, so the tube body formed by this method is smooth, beautiful, and has no joints. However, since the tube body is printed on a curved surface, the reject rate during the printing process is significantly higher than that of a flat-printed product, which leads to an increase in the production cost of the tube. [0003] In...

AI Technical Summary

Problems solved by technology

In this forming process, in order to ensure that the final hose made after sheet welding can meet the basic functional requirements in terms of mechanical properties, barrier properties, and sealing properties, the hose body is mostly welded by lap joints, that is, welding The two ends of the sheet at the rear welding seam partially overlap, so the packaging tube body made by this forming method has obvious unevenness and joint marks, which affects the appearance

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