An Injection Molding Production Process for Reducing Warping of Plastic Flat Plates

Abstract

The invention provides an injection molding production process capable of reducing the warping possibility of a plastic plate. The injection molding production process comprises following steps: 1. arranging a smooth platform, adding liquid to the surface of the smooth platform, and uniformly distributing the liquid on the surface of the smooth platform; 2. molding the plastic plate through the injection molding process; 3. arranging the demoulded plastic plate on the smooth platform; 4. applying force so as to enable the plastic plate to abrade the surface of the smooth platform distributed with liquid or enable the plastic plate to vibrate the smooth platform, carrying out vacuum adsorption on the plastic plate and the smooth platform through liquid, and retracting the applied force; 5. further cooling and shaping the plastic plate and the smooth platform subjected to vacuum adsorption; and 6. separating the cooled and shaped plastic plate from the smooth platform, and picking up the plastic plate. According to the injection molding process, the process flow is simple, the use range is wide, the plastic plate only needs to be flatly attached to the smooth platform distributed with liquid; due to the utilization of the vacuum adsorption force, the possibility of warping deformation of the plastic plate in the cooling and shaping process can be reduced, and on the basis of not modifying the original matched production device of injection molding production, the yield of the plastic plate is greatly increased, the injection molding production time is shortened, and the injection molding production process has market economic benefits.

Description

technical field [0001] The invention relates to the technical field of injection molding production technology, in particular to an injection molding production technology for reducing the warpage of plastic flat plates, and is especially suitable for the production requirements of plastic light-shielding plates for photographic lamps. Background technique [0002] The existing plastic flat injection molding process mainly includes five stages of mold closing, filling, pressure holding, cooling, and demoulding, in which the design of the cooling system is very important. This is because the molded plastic product can only be cooled and solidified to a certain rigidity, and the deformation of the plastic product due to external force and internal stress relief process can be avoided after demoulding. Since the cooling time accounts for about 70% to 80% of the entire molding cycle, a well-designed cooling system can greatly shorten the molding time, improve injection molding p...

AI Technical Summary

Problems solved by technology

Improperly designed cooling system will lengthen the molding time and increase the cost; uneven cooling will further cause warping and deformation of plastic products

In the prior art, cooling water pipes are commonly used at the mold cavity. In order to enhance the cooling effect, the number of cooling water pipes is increased, and the diameter of the cooling water pipes is enlarged. This not only increases the cost of injection molding, but also the large number of cooling water pipes cannot be evenly distributed due to the limitation of the mold structure. Easy to cool unevenly and cause further warping and deformation of plastic products

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