Method for producing toothbrush handle by injection molding for twice

Abstract

The invention relates to a method for producing a toothbrush handle by injection molding for twice, wherein a semi-finished product is manufactured by using the process of firstly injection molding, wherein the process of firstly injection molding comprises the following steps: first-stage ejecting glue; second-stage ejecting glue; melting glue; and taking out the glue; after the semi-finished product manufactured by using the process of firstly injection molding is placed at the position corresponding to a mould for secondarily injection molding, the injection molding mould automatically closes following an injection molding machine; and the process of secondarily injection molding comprises the following steps: ejecting, keeping pressure, feeding material, releasing, opening the mould, and taking out the finished product formed by using the process of secondarily injection molding from the injection molding mould.

Description

technical field [0001] The invention relates to a method for producing toothbrush handles by double injection molding. Background technique [0002] Currently, toothbrush handle molding methods mainly include plastic injection molding, plastic compression molding and plastic die-casting, among which injection molding is more commonly used. The so-called injection molding is to heat and melt the raw material in the barrel of the injection molding machine. Under the action of injection pressure, the molten raw material is ejected from the nozzle at the front end of the barrel, flows through the gating system and is injected into the closed cavity of the mold, and then cooled. Finalize the shape, and finally, open the cavity, and take out the product from the mold. However, the toothbrush handle molding method in the prior art mostly uses one-time injection molding, but due to the limitation of the maximum flow of the melt, this kind of process cannot produce thicker brush han...

AI Technical Summary

Problems solved by technology

However, the toothbrush handle molding method in the prior art mostly uses one-time injection molding, but due to the limitation of the maximum flow of the melt, this kind of process cannot produce thicker brush handles, let alone produce brush handles with more complicated shapes. , can only produce a single brush handle with a simple shape, and if the mold components are filled at one time during the injection molding process, it is easy to produce glue overflow, which not only causes a large number of batches, but also causes serious shrinkage, and also causes damage to the mold cavity. Therefore, the surface of the final product is unclean, with visible impurities, cracks, burnt and air bubbles with a diameter greater than 1mm, and the product parting line is wide, wrong mold, burr, thimble top concave, concave Bad phenomena such as grooves, stretching, flashing, and deformation often appear

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