imd in-mold heat cutting secondary molding method

Abstract

The invention provides a hot-cutting and secondary-molding method in an IMD (in-mould decoration) mould. The hot-cutting and secondary-molding method comprises the following steps: a mould closing step of closing an upper mould and a lower mould of the mould; a mould locking step of locking the upper mould and the lower mould to form an accommodating cavity for molding the IMD mould; an injection-molding step of injecting slurry from a pouring gate of the accommodating cavity through an injection-molding nozzle at a rate V1 via an injection molding machine; a pressure maintaining step of injecting the slurry from the pouring gate of the accommodating cavity at a rate V2 via the injection molding machine, forming an IMD part prototype, and forming an injection-molding stub bar at the pouring gate, wherein V2 is smaller than V1; a hot-cutting step of upwards jacking the pouring gate by use of an ejector pin to separate the injection-molding nozzle from the injection-molding stub bar, stretching the injection-molding stub bar into the IMD part prototype by resisting and integrating the injection-molding stub bar with the IMD part prototype; a cooling step of cooling the IMD part prototype in the mould accommodating cavity into an IMD part; and a mould opening step of opening the upper mould and the lower mould, and taking out the IMD part molded in the mould accommodating cavity. According to the hot-cutting and secondary-molding method, the qualified rate of products is increased, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the IMD process, in particular to an IMD in-mold hot-cutting secondary forming method. Background technique [0002] The Chinese name of IMD: in-mold decoration technology, also known as coating-free technology. English name: In-Mold Decoration, IMD is an internationally popular surface decoration technology. The surface is hardened transparent film, the middle printing pattern layer, the back injection molding layer, and the middle of the ink, which can make the product resistant to friction, prevent the surface from being scratched, and keep the color for a long time. Bright and not easy to fade. [0003] At present, for the existing IMD parts that are injection molded by the IMD process, a complete cycle process generally includes mold opening, mold locking, injection molding, pressure holding, cooling, mold opening, and material cutting. Among them, the process of material cutting is specifically to remove the injection p...

AI Technical Summary

Problems solved by technology

It can be understood that the use of the above method will cause the trimmed shavings to remain in the flow channel of the mold, so that when the next cycle is performed, the remaining shavings will rush to the IMD part with the slurry injected by the injection molding machine The surface of the IMD part will cause the peeling of the outer film of the IMD part and the concave-convex marks, thereby forming defective products and reducing the qualified rate of the product; it can be understood that the manual trimming method is used to trim the injection plastic head, which is easy to Causes scratches to IMD parts, and its production efficiency is low

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