Factors Related To Single Deviation Of Injection Molded Plastic Parts

- Aug 20, 2018-

  At present, there are many performance modification processes for injection molding plastic parts, including mechanical modification, finishing, color application, metal plating, and the like. Of course, this is a general classification, in which the mechanical modification includes enamel, grinding, polishing and other processes, mainly used to remove the burrs, burrs and corrected dimensions on the injection molded plastic parts. The coating is applied to the surface of the plastic part, and the combined effect of the solvent can be used to achieve an incremental effect, or the surface of the product can be applied  with a patterned film; the coloring is also divided into painting, printing and hot stamping, wherein the hot stamping is The heating and pressurization is carried out so that the colored aluminum foil layer on the hot stamping film is transferred onto the injection molded plastic member, thereby obtaining a different pattern. Among the several factors affecting the quality of injection molded plastic parts, wall thickness plays an important role. Previous practical experience also tells us that once the wall thickness is too small, the flow resistance will be large. In this case, large and complex injection molding Plastic parts cannot fill the cavity, which ultimately leads to a drop in quality. Therefore, when designing the wall thickness of injection molded plastic parts, there are requirements to be achieved, mainly the following:

  First of all, of course, it must have sufficient strength and rigidity; at the same time, it can withstand the impact and vibration of the demolding mechanism during demolding; and it has sufficient bearing capacity to complete the assembly. Generally, plastic injection parts manufacturers have specified a minimum value, but the minimum value is not the same due to the variety of plastics, grades and products. The wall thickness of the injection molded plastic parts should not be too small or too large, otherwise the raw materials are wasted, and the molding time of the thermosetting plastics is increased, and the curing is incomplete.

  This has a lot to do with the injection molding process, the mold and many technical parameters. In the case of continuous production of non-variable parameters, the most important influence on the weight stability of the product is the temperature, and includes the temperature of the mold and the hydraulic oil. Temperature, barrel temperature, etc. The mold temperature, especially the temperature of the cavity surface, depends mainly on the stability of the molding cycle and the stability of the cooling water; the main factor affecting the temperature of the hydraulic oil is the efficiency of the oil temperature cooler; Pressure related. If the above requirements are met, it depends on the precision of the injection molding machine. If the precision of the machine can be guaranteed, the weight of the injection molded plastic parts will not be much different.