Method for thermoplastic moulding of a tubulant item, a tubular item and an injection mould with a rotating core

Abstract

A method for compact injection moulding of a long, tubular thermoplastic item with an at least partly through-going hole longitudinally of the item made by means of mould core, where the mould core rotates during the moulding.

Description

technical field [0001] The present invention relates to a method of making a long tubular thermoplastic member having a base at one end. Background technique [0002] For example long tubular thermoplastic parts with a base at one end can be used in many applications such as pneumatic cylinders, scaffolding rods, structural elements for latticework and cleaning implements such as broom handles. [0003] For different types of cleaning implements there are handles in different designs, eg ergonomic, and in different materials, usually aluminum or wood. [0004] In recent years, synthetic materials have been used more and more widely to manufacture such handles. To save weight, handles for brooms, floor mops, and other cleaning implements that require longer handles are made with hollow handles produced by extruding thermoset plastic material. However, the use of extrusion to manufacture such handles means that the resulting handle has a certain outer diameter over the entir...

AI Technical Summary

Problems solved by technology

When the plastic part is to be detached from the long mandrel, the mandrel needs to be tapered so that the clamping force of the mandrel around the cured thermoplastic blank causes the mandrel to slide slightly upwards from the tapered surface, thus reducing the clamping force

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