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Brief analysis of the injection molding process

update:15-06-2019
abstract:

The plastic extrusion process uses a large injection mo […]

The plastic extrusion process uses a large injection molding machine with six processes ahead of the resin to develop a product ranging from small Halloween spiders to larger plastic products.

The injection molding machine can be simple. It consists of two basic components, which are injection devices and clamping devices. It is easy to understand how easy this process is.

The process begins in a mold that is clamped during the spraying and cooling of the pressure. The resin is fed into a machine and falls into the barrel where they are heated to their melting point and then injected into the mold.

Next is some so-called dwelling phase, when the molten plastic is in the mold and mechanically or by hydraulic strength, it is forced to fill all the cavities down the mold, and then the plastic is cooled in the mold.

Separating the two parts of the mold, the injection needle forces the plastic out of the final step, and the periodicity of the entire process ranges between 10 and 100 seconds.

It all depends on the cooling time, no matter what the plan of the plastic molding company is, it is interesting that each type of resin must calculate the shrinkage value of the melting process. If the calculation is wrong, the product will be wrong, the size or shape will be There are errors, and warping is also a problem that needs to be avoided.

When the temperature is set too high, or the uneven plastic surface may also lead to incomplete filling of the mold, affecting the quality of injection molding, foreign imports and plastic molds themselves can be quite expensive. Buying bulk is a way to reduce costs. .

Injection molding is a wise investment between consumers and businesses, so be sure to find some of the highest quality plastic molding companies.

Four conditions for optimal plastic mold temperature control

The plastic mold temperature control system consists of three parts

In the first part, the heating cooling channel is in the mold.

The second part, the coolant.

The third part, the temperature control part.

In order to achieve optimal plastic mold temperature control, these three parts must meet the following four conditions:

First, the location of the heating cooling channel

The number and location of the heating and cooling channels should be such that the temperature control of all the mold parts is uniform, ensuring a large enough heating and cooling channel, the surface is available, and must be provided for temperature control, especially for molding angles and cores. (angular deformation).

Second, the size of the heating and cooling channel

The heating cooling channel takes into account the size connection, the pressure that must be applied needs to be used to transport the coolant in the mold. If the cooling channel is too small, the high pressure drop is the result, due to too large, resulting in a low flow velocity in the cooling channel. Flow is the primary reference for the effectiveness of the cooling system.

Third, the temperature difference

The temperature difference between the inlet and the outlet temperature of the coolant should be as small as possible, so that it is divided into several parallel circuits and placed on the assembly so that the temperature difference does not become excessive, and dimensional and quality requirements are necessary.

Fourth, the coolant and temperature control unit

The coolant should have good performance and water has proven to be the ideal coolant for thermoplastic processing. The temperature control unit must be able to maintain the average plastic mold wall temperature required within tight limits, regardless of production conditions.