Solution for product overflow defects during injection molding

1. Failure of mold or machine table locking force

l Grind the mold surface of the overflow edge.

l Choose the machine with greater locking force.

l Check whether the hinge of the mold locking machine is worn or whether the sealing element of the mold locking oil cylinder is oil dripping or reflux phenomenon, and replace or repair it in time.

l Check whether the heating system is out of control, resulting in the actual temperature is too high, we need to check whether the thermocouple, heating ring and other components are working normally.

2. The distribution of mold cavity is uneven or insufficient parallelism

l Without affecting the integrity of the parts, the flow channel is placed as far as possible in the center of mass symmetry.

l Improve the design and machining precision of the die, and ensure the die parallelism and assembly accuracy.

3. The force imbalance of the movable member and sliding core in the mold

l Check the force of the moving member and sliding core in the mold to ensure the force balance.

l Adjust the mold structure or add a guide mechanism to improve the stress state.

l Determine the size of different exhaust tanks according to different materials.

4. Poor mold exhaust

l Open a good exhaust system, such as digging an exhaust trench on the classification surface.

l Ensure that the exhaust channel of the mold is smooth to prevent the type surface expansion due to poor exhaust.

5. Plastic is too liquid or add too much lubricant

l Reduce the injection pressure, velocity and temperature appropriately to reduce the mobility of the melt.

l Reduce the amount of lubricant used, or use less liquid plastic materials.

6. The injection pressure, injection speed and temperature are set too high

l Reduce the injection pressure and speed to avoid the excessive impact force of the melt on the mold cavity.

l Reduce the temperature of the material cylinder and nozzle to control the temperature of the melt.

7. Low assembly accuracy of mold-type surface

l Correct the classification surface to ensure the assembly accuracy of the mold.

l Check whether the flatness of the template and the mold classification surface are locked, and adjust them in time.

8. The melt is not evenly distributed in the mold cavity, and the filling rate is not uniform

l Balalize injection pressure and filling rate to ensure the uniform distribution of the melt in the mold cavity.

l Optimize the mold construction and injection process to improve the melt mobility.

9. Too much injection

l Control the injection amount of the melt to avoid excessive pressure in the mold chamber.

l Check the fixed injection amount of the material cylinder regularly to ensure that it matches the production demand.

10. The particle size of plastic raw materials is uneven

l Use plastic raw materials with uniform particle size to ensure a stable amount of added ingredients.

l Regularly check and clean the glue head, glue ring and glue washer of the screw rod to prevent melt reflux and overflow edge due to excessive wear. Determine the size of different exhaust tanks according to different materials.

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