Precision Plastic Injection

Precision plastic injection defects and solutions:
1. There is dizziness near the material head
Appearance
There is a discernible ring around the head, either a central circle if a central gate is used, or a concentric circle if a side gate is used, because the ring is small in size and looks like a halo. This mainly occurs when processing high viscosity (low fluidity) materials, such as PC, PMMA and ABS.

physical reason
If the injection speed is too high, the flow rate of the molten material is too fast and the viscosity is high, and the material near the surface layer of the material head is easily dislocated and infiltrated.
These dislocations appear as dark halos in the outer layers.
Near the head, the flow velocity is particularly high, then gradually decreases, and as the injection velocity becomes constant, the flow front expands into a gradually widening circle. At the same time, in order to obtain a low fluid front flow velocity near the material head, multi-stage injection must be used, for example: slow one faster one fast. The goal is to obtain a uniform melt front velocity throughout the filling cycle.

It is generally believed that the loss of halo is caused by the dislocation of the melt during the pressure holding stage. In fact, the role of the front flow effect is to move the melt into the interior of the product during the pressure holding stage.

Reasons and improvement measures related to precision plastic injection and processing parameters:
1. The flow rate is too high, using multi-stage injection: slow-fast-fast
2. The temperature of the melt is too low. Increase the temperature of the barrel and increase the back pressure of the screw.
3. The mold wall temperature is too low, increase the mold wall temperature
Design-related reasons and improvement measures:
1. The gate and the product form an acute angle, and the gate and the product form an arc
2. The gate diameter is too small, increase the gate diameter
3. The gate position is wrong and the gate is repositioned

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1. Injection molding service

* High precision and strict standards
* Professional DFM report before mold making
* Support rapid prototyping and mass production

2. Plastic CNC processing service
* OEM CNC machining service
* Customized drawing processing
* Normal tolerance: +-0.01

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