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Plastic mold classification and plastic forming analysis

Release time:2021-10-22

There are many types of moulds. Only plastic moulds can be divided into:

(1) Injection mold; (2) Blow mold; (3) Blister mold; (4) Extrusion die; (5) Foaming mold; (6) Silicone mold.


Injection molds can be subdivided into:

According to different runner systems, it can be divided into two parts: hot runner mold and cold runner mold;

According to the different ways of channel separation, it can be divided into: two plate mold, three plate mold;

According to the different forms of ejection, it can be divided into: positive mold, inverted mold;

According to the type and quantity of injection molding plastic, it can be divided into two kinds: monochrome mold and two-color mold.


Plastic molding cycle process:

1) Mold closing - the mold closes and generates high pressure.

2) Injection - inject molten plastic into the mold cavity at a certain speed, pressure and metering.

3) Pressure maintaining: after the injection section, the plastic is still injected at a certain pressure for feeding.

4) Cooling - the process of product cooling and shaping.

5) Storage - the screw rotates backward to plasticize a certain amount of raw materials for the next injection.

6) Mold opening - open the mold.

7) Ejection - the product is pushed out after cooling and shaping.

8) Close the mold and start the next cycle.


Five parameters of forming:

1) Pressure: including injection pressure, holding pressure, clamping force, back pressure, ejection pressure, water pressure, etc.

2) Speed: including injection speed, mold opening and closing speed, material storage speed, ejection speed, etc.

3) Temperature: material pipe temperature, mold temperature, cooling medium temperature, original semi drying temperature, etc.

4) Time: injection time, pressure holding time, cooling time, forming cycle base, etc.

5) Position: storage metering position, loosening position, injection section switching position, pressure maintaining switching point, mold opening position, ejection position.


Bad forming analysis:

1. Weld

Cause: multi point glue feeding or glue melting bypasses the broken hole and forms a line mark on the plastic surface.

Countermeasures: (1) improve the mold temperature, especially the front mold temperature; (2) Improve the ejection speed; (3) Increase the holding pressure; (4) Raise the temperature of the feed pipe; (5) Increase back pressure; (6) Expand the gate; (7) Increase exhaust; (8) Add cold wells.

2. Shrink

Definition: dents caused by local excessive shrinkage of plastic.

Countermeasures: (1) increase the holding pressure; (2) Increase glue injection; (3) Reduce the temperature of the feed pipe; (4) Reduce the mold temperature; (5) Expand the gate; (6) Change the gate position; (7) Add more glue; (8) Modify the product structure.

3. Spray mark

Definition: scattered traces of plastic products around the gate.

Countermeasures: (1) raise the mold temperature; (2) Reduce the ejection speed; (3) Adjust the shooting position; (4) Improve gate design; (5) Add cold charging wells; (6) Expand the flow passage.

4. Flow mark

Definition: the strip-shaped white trace formed on the surface during the product molding process.

Countermeasures: raise the mold temperature; Reduce the ejection speed; Raise the temperature of the feed pipe; Increase back pressure; Sufficient drying of raw materials; Expand the gate; Add more glue; Increase flow channels and cold charging wells.

5. Disc print

Definition: a ring-shaped texture near the gate.

Countermeasures: (1) raise the mold temperature; (2) Improve the ejection speed; (3) Raise the temperature of the feed pipe; (4) Increase back pressure; (5) Expand the gate; (6) Add more glue.

6. Unsatisfied mold

Definition: glue shortage caused by insufficient product filling.

Countermeasures: (1) increase the injection pressure; (2) Improve the ejection speed; (3) Raise the mold temperature; (4) Raise the temperature of the feed pipe; (5) Increase the quantity of materials; (6) Expand the gate; (7) Expand the flow channel; (8) Increase exhaust; (9) Increase the material thickness of the product; (10) Increase the liquidity of raw materials.

7. Phi Feng

Definition: excess sheet growing along the parting line in product forming.

Countermeasures: (1) reduce the injection pressure; (2) Reduce the ejection speed; (3) Reduce the mold temperature; (4) Adjust the delivery switching point; (5) Reduce the quantity of materials; (6) Reduce the temperature of the feed pipe; (7) Reduce the gap of the mold; (8) Evenly feed glue.

8. Z-shaped spray mark

Definition: spray marks formed by direct filling of plastic.

Countermeasures: (1) raise the mold temperature; (2) Reduce the ejection speed; (3) Raise the temperature of the feed pipe; (4) Change the gate position; (5) Increase the cross section of the gate.

9. Stress trace

Definition: marks formed on the outer surface of products due to sudden changes in material thickness.

Countermeasures: (1) reduce pressure maintaining; (2) Adjust the injection switching point; (3) Balanced glue feeding; (4) Change the gate position; (5) Increase gate; (6) Increase exhaust; (7) Change the product structure; (8) Secondary processing desalination;

From the perspective of cost and service, the improvement of poor appearance is: 1) adjustment and improvement; 2) Change the mold; 3) Secondary processing; 4) Replace the product.

Copyright: Shenzhen Zhongyuan Plastic Co., Ltd. | mold processing customized manufacturer. If you want to know the processing price of the factory, how much is it, and which is good, please contact us Yue ICP Bei No. 17060480
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