A heat-shrinkable tube expansion mold

Abstract

A heat shrink tube expanding mould comprises an outer sleeve, a left intermediate sleeve, a middle intermediate sleeve, a right intermediate sleeve and a sizing tube, wherein the outer sleeve is provided with a water outlet, a vacuum hole, a water inlet and a water suction inlet, the left intermediate sleeve is provided with a water outlet hole, the middle intermediate sleeve is provided with a water inlet hole, and the sizing tube is mounted in the left intermediate sleeve, the middle intermediate sleeve and the right intermediate sleeve. A forming passage is arranged in the sizing tube, a long water hole is formed in the wall of the sizing tube, a vacuum chamber and a water suction chamber are formed among the inner wall of the outer sleeve, the left intermediate sleeve, the middle intermediate sleeve, the right intermediate sleeve and the outer wall of the sizing tube, and the sizing tube is provided with water outlet through holes, small vacuum holes, water inlet through holes and water suction through holes. The water outlet through holes, the long water hole and the water outlet hole are communicated with the water outlet, the vacuum hole, the vacuum chamber, the small vacuum holes and the forming passage are communicated, the water inlet through holes are communicated with the long water hole, the forming passage, the water inlet hole and the water inlet, and the water suction inlet, the water suction chamber and the water suction through holes are communicated. The heat shrink tube expanding mould is good in cooling effect, and axial shrinking ratio of heat shrink tubes is less than 1.5%.

Description

technical field [0001] The invention relates to heat-shrinkable tube manufacturing equipment, in particular to a heat-shrinkable tube expansion mold. Background technique [0002] At present, heat-shrinkable tube expansion molds are generally composed of a vacuum chamber and a cooling chamber, and the cooling and expansion are separated. The vacuum chamber is not cooled, and the cooling chamber cannot be expanded. In addition, there is no cooling water inside the mold, and the heat-shrinkable tube and the inner wall of the sizing tube There is no lubrication between them, the axial shrinkage rate of the heat shrinkable tube is relatively large, often fluctuates, and cannot be controlled within 2%, which affects product quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of the existing heat-shrinkable tube expansion molds, and provide a heat-shrinkable tube expansion with good cooling effect, pr...

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