Continuous production method and production system of flat heat-shrinkable tube

Abstract

The invention discloses a continuous production method of a flat heat-shrinkable tube, which is used to extrude the continuously expanded heat-shrinkable tube to form a flat heat-shrinkable tube. Two positions (P, P') are extruded at the same time. During the simultaneous extrusion of two positions (P, P'), first stop the extrusion at the first position P so that it is held behind the first position P. The gas in the heat-shrinkable tube flows forward from the first point P; then start the extrusion at the first point P, and stop the extrusion at the second point P' to make the heat shrink after the second point P' The gas in the tube flows forward, and then starts to squeeze at the second position P', so as to circulate, so that the gas in the tube is released when the heat-shrinkable tube continues to advance. The invention also discloses a continuous production system of the flat heat-shrinkable tube. The method of the invention is simple, easy to expand, and can improve product quality.

Description

technical field [0001] The invention relates to a continuous production method and production system of flat heat-shrinkable tubes. Background technique [0002] Heat shrink tubing is generally produced by extrusion, irradiation and expansion. At present, there are two forms of heat shrinkable tubes: round tube heat shrinkable tube (round tube) and flat heat shrinkable tube (flat tube). The unexpanded heat shrinkable tube is expanded through the expansion die to form a round tubular heat shrinkable tube, while the flat heat shrinkable tube needs to expand the unexpanded heat shrinkable tube through the expansion die while extruding the expanded heat shrinkable tube. The die is extruded. [0003] Compared with the round tube, the flat tube is not only convenient to transport and reduce the transportation cost because it occupies a smaller volume in the package because it is flattened, but also is flattened when cutting the tube, which is convenient for cutting and improves ...

AI Technical Summary

Problems solved by technology

[0004] However, in the process of extruding the above-mentioned heat-shrinkable tube from a round-shaped heat-shrinkable tube to a flat-shaped heat-shrinkable tube, the volume is greatly reduced, and the air in the original round tube flows along the round tube to the direction of the expansion mold, while in the flat-shaped heat-shrinkable tube In the mass production of heat-shrinkable tubes, the length of the flat heat-shrinkable tubes produced at one time is several thousand meters or tens of thousands of meters. More and more air cannot be released, which not only leads to failure of expansion, but also produces defective products

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