What are the factors that affect the size of injection molded products?
Release Time：
2021-06-07
Source：
The temperature and pressure variations of plastic injection molding have a great impact on the dimensional accuracy of plastic products, and are also influenced by the time of use and the environment. Therefore, in order to process products with high precision, we must first understand what factors affect the size of injection molded products. I: What are the factors that affect the size of injection molded products? 1) Restricted by the fluidity of plastic raw materials. Under certain equipment and injection molding process conditions, the plastic with good fluidity can be molded into larger size plastic parts; on the contrary, the plastic with little fluidity can be molded into smaller size plastic parts. (2) The size of injection molded products is also limited by the injection molding equipment. The size of injection molded plastic parts is limited by the injection volume, clamping force and template size of the injection machine; the size of compression and pressure injection molded plastic parts is limited by the z-large pressure of the press and the z-large size of the press working table. Two: What are the factors that produce the instability of the size of plastic parts? 1) Unstable electrical and hydraulic systems of injection machines; 2) Unstable amount of material addition; 3) Uneven plastic particles and unstable shrinkage rate; 4) changes in injection molding conditions (temperature, pressure, time) and inconsistent molding cycles; (5) Injection mold gate is too small, inconsistent size of multi-cavity inlet, unbalanced feeding; (6) bad precision of the injection mold, unstable movement of moving parts and inaccurate positioning.
The temperature and pressure variations of plastic injection molding have a great impact on the dimensional accuracy of plastic products, and are also influenced by the time of use and the environment. Therefore, in order to process products with high precision, we must first understand what factors affect the size of injection molded products.
I: What are the factors that affect the size of injection molded products?
1) Restricted by the fluidity of plastic raw materials. Under certain equipment and injection molding process conditions, the plastic with good fluidity can be molded into larger size plastic parts; on the contrary, the plastic with little fluidity can be molded into smaller size plastic parts.
(2) The size of injection molded products is also limited by the injection molding equipment. The size of injection molded plastic parts is limited by the injection volume, clamping force and template size of the injection machine; the size of compression and pressure injection molded plastic parts is limited by the z-large pressure of the press and the z-large size of the press working table.
Two: What are the factors that produce the instability of the size of plastic parts?
1) Unstable electrical and hydraulic systems of injection machines;
2) Unstable amount of material addition;
3) Uneven plastic particles and unstable shrinkage rate;
4) changes in injection molding conditions (temperature, pressure, time) and inconsistent molding cycles;
(5) Injection mold gate is too small, inconsistent size of multi-cavity inlet, unbalanced feeding;
(6) bad precision of the injection mold, unstable movement of moving parts and inaccurate positioning.
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