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Basic conditions for processing plastic injection parts
发布日期: 2019.10.09 Back to list source: Release date: 2019.10.09

The first is close molding, which is a very important indicator. In principle, it should be greater than the total pressure of plastic injection into the mold, based on no burrs. Mold closing is a real reference factor and one of the basic conditions for plastic injection molding. Good mold pressure adjustment is also a benefit for injection molding.

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Generally speaking, pressure and speed have a partly the same relationship in the mold. So that it also has a certain effect in the mold. Objective To make the raw materials enter the mold uniformly, thoroughly and properly in all corners. If it is too low, it will shoot short and shrink. If it is too high, it has burrs, oversaturation, mold sticking, scorching, damage to the mold and high internal stress. Only the most suitable pressure and speed can make the filling mold reach an ideal state.

I believe everyone already has a certain understanding of the speed. The speed determines the condition of the raw material in the mold runner and in the finished product. The same is true if there is burr, oversaturation, and scorch. If it is slow, short shots, shrinkage, and poor combination are easily broken. So we need to adjust the parameters, and then consider further to optimize the speed to the best state.

Different temperatures will bring different experiences. Different raw materials and different temperatures. If the temperature is too low, the color of the solution glue will be uneven, and the internal stress of the finished product will increase. If the temperature is too low and the pressure is too high, the screw may break. If the temperature performance is too high, the product has burrs, and the temperature difference due to cooling causes shrinkage. We know that raw materials will decompose, turn yellow, become discolored, and break easily. If the cooling time becomes longer during this process, gas will not be easily discharged, and there will be gas.

A common factor: back pressure. The resistance of the screw to retreat when rotating and feeding is called back pressure. Its effect makes the raw material more compact in conveying and compressing. The raw material air and water can be discharged from the back of the screw. So that the sol contains no gas components that affect the surface of the finished product. Low pressure will cause bubbles and silver streaks on the surface. High pressure will cause overheating, agglomeration, glue overflow, long cycle, and the screw will not retreat. Therefore, it is important to ensure that the back pressure is not high or low, and the application of loosening is very important: when the back pressure is low, some raw materials are loosened, and some are not necessary. When the back pressure is high, it is necessary to use loosening and pay attention to whether the distance does not involve air and does not spill glue. This is back pressure.

The temperature of a mold and the length of the cooling time will eventually affect the finished product's sticky mold, shrinkage, dimensional tolerance, surface brightness, cycle, etc. These conditions should be adjusted in a timely manner according to actual conditions. In addition, acrylic, PC, if the finished meat is thick, there must be mold temperature, so that bubbles and stress will not be generated. So how much temperature is needed to make the final product unaffected. The conditions for processing plastic injection molded parts are as described above, and it is already clear. In the injection molding factory, there are many factors that restrict the smooth molding of the final product.

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