Heat treatment method for correcting plane warping deformation of injection molded product

Abstract

The invention provides a heat treatment method for correcting the plane warping deformation of an injection molded product and belongs to the technical field of injection molding. A correcting tool isdivided into three parts including a U-shaped correcting support frame, a regulating block and a pressure application block. The heat treatment method comprises the steps: placing the regulating block in the middle of the U-shaped correcting support frame, placing a corrected injection molded product above the regulating block and the U-shaped correcting support frame, and mounting the pressure application block above the corrected injection molded product; then, placing a combined body into a drying oven or completing the combination in the drying oven, carrying out heat insulation, meanwhile, keeping a drying environment, setting the temperature of the drying oven to be 10-20 DEG C lower than the glass transition temperature of the material of the injection molded product, keeping the temperature for 1-2 h, and then, taking out and separating each part; and cooling a to-be-corrected injection molded product to the room temperature, and repeating the process once or twice. Accordingto the heat treatment method, a plastic product is subjected to heat treatment, and the internal stress of the plastic product is firstly released under the assistance of correcting measures, so thatthe problem of injection molding plane warping deformation is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of injection molding, and in particular relates to a heat treatment method capable of correcting plane warping deformation of injection molding products. Background technique [0002] With the development of the plastics industry, the application fields of injection molding products continue to expand, and the application environment is becoming more and more complex and even harsh, such as in high temperature and humid occasions. In the injection molding process, due to the coupling effect of multiple factors such as the structure of the plastic product itself, the structure of the mold, and the molding process, the molded plastic product has more or less residual stress. When this kind of plastic products are used normally under normal conditions, the internal stress will be gradually released, and the shape and performance of the products will basically not be affected. However, if it is used in a high-t...

AI Technical Summary

Problems solved by technology

However, if it is used in a high-temperature place that requires heating, such as when doing PCR (polymerase chain reaction), the plastic chip needs to be heated to 70-90°C, and the internal stress will be released rapidly at this time, and the external performance is that the plastic product will be damaged. Warping and deformation will affect the normal use of plastic products (for plastic chips, it will adversely affect the test results); especially for plastic products with planar features

Some of these problems can be solved by improving product design or mold design, and optimizing the molding process, but there are still many problems that cannot be avoided or solved by the above measures, and must be solved by some post-processing methods

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