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Temperature control of injection molding process!

浏览:238 发表时间:2017-04-06 15:47:43

1 barrel temperature:

The melting temperature is very important, and the temperature of the cylinder is only a guide. Melt temperature can be measured at the nozzle or measured by air sparging. The temperature setting of the injection cylinder depends on the melt temperature, screw speed, back pressure, injection quantity and injection molding cycle. If you do not have a certain level of plastic processing experience, please start from the lowest settings.

For ease of control, the injection cylinder is divided into zones, but not all are set to the same temperature. If operating for a long time or operating at high temperatures, set the temperature of the first zone to a lower value, which will prevent premature melting and diversion. Make sure that the hydraulic oil, the hopper seal, the mold and the injection cylinder are all at the right temperature before the injection.

2 melt temperature:

The temperature of the melt flow properties of the melt plays a major role, because there is no specific plastic melting point, melting temperature is called a molten plastic, molecular chain structure and composition are different, so the liquidity effect is also different, rigid molecular chain is affected by temperature is obvious, such as PC, PPS etc. the flexible molecular chains such as PA, PP, PE and other liquidity by changing the temperature is not obvious, it should be to adjust the injection temperature reasonably according to the different material.

3 mold temperature:

Some plastic material due to high crystallization temperature, slow crystallization rate, high mold temperature, some of the control of size and deformation, or the need to release, high temperature or low temperature, such as PC General requirements of more than 60 degrees, while the PPS in order to achieve better appearance and improve liquidity, sometimes need to mold temperature more than 160 degrees, so the mold temperature to improve the appearance of the product, deformation, size, can not be underestimated the role of rubber mold.

4 injection pressure:

Melt overcome required resistance, directly affect the product size, weight and deformation, different plastic products required for different injection pressure, such as PA, PP and other materials, increase the pressure will make its liquidity significantly improved, the injection pressure determines the density of the products, the appearance of gloss. It does not have a fixed value, and the more difficult the mold filling, injection molding pressure increases.


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