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(1) Insufficient rubber compound in the mold cavity causes shrinkag

1.Insufficient filling or insufficient feeding amount

2.Improper gate position or asymmetry of the gate

3.The runner or gate is insufficient or too small

4.The wall thickness of the product is uneven, and dents are prone to occur on the back at the thick-walled areas

Carry out adjustment and correction

1.Increase the feeding or open the discharge port gate wider

2.Restrict all the molten adhesive from flowing into the sprue gate and prevent it from flowing into other gates

3.Increase the number of runner channels and enlarge the gate size

4.The working die can be modified or the injection pressure can be increased

(2) Improper adjustment of process technology parameters

1.The injection pressure is low and the injection speed is slow

2.The injection time setting is too short

3.The pressure-holding time setting is too short

4.The cooling time setting is too short

Carry out adjustment and correction

1.Adjust and increase the injection pressure and injection speed

2.Increase the setting value of the injection time

3.Increase the pressure-holding time setting value

4.Increase the cooling time setting value

(3) The plastic is overheating

1.The plastic is overheating and the temperature setting of the melt cylinder is too high

2.The mold temperature is too high.

3.There is local overheating in the mold or overheating when the product is demolded

Carry out adjustment and correction

1.Reduce the temperature setting value of the melt glue cylinder

2.Reduce the mold temperature and adjust t3.he inlet gate valve of the cooling system

1.The material "Bridges" in the hopper, resulting in insufficient feeding.

2.Insufficient injection volume, inadequate plasticizing capacity and insufficient leftover material.

3.The diversion channel is insufficient or the gate is small.

4.The flow state of the molten adhesive flowing into the multi-cavity die cannot be properly balanced.

5.The amount of molten glue in the mold cavity is greater than the injection volume of the injection molding machine.

6.The flow resistance of the mold gating system is large, the position of the feed port is improper, the cross-section is small and the form is poor, the flow process is long and tortuous.

7.Air cannot be expelled from the mold cavity.

8.The plastic contains a lot of moisture, volatile substances or has a large amount of gas in 9.the molten material.

9.The nozzle temperature is low, the barrel temperature is low, causing blockage, or the nozzle hole diameter is too small.

10.The injection pressure is low and the injection speed is slow.

11.The injection time setting is too short.

12.The pressure-holding time setting is too short.

13.The fluidity of the plastic is too poor, resulting in excessive flash and overflow.

14.The mold temperature is too low and the plastic cools down too quickly.

15.Excessive use of demolding agent, moisture in the mold cavity, etc.

16.The wall of the product is too thin, the shape is complex and the area is large.

1. Inspect the water transport ring cooling system to eliminate the "bridging" phenomenon

2.Reduce the injection volume to maintain a fixed material intake and enhance the plasticizing capacity

3. Add more runner channels or increase the gate size

4. Correct the situation of unbalanced flow state

5. Use a larger injection molding machine or reduce the number of model cavities in the working mold

6. Improve or modify the mold gating system, including aspects such as the position, cross-section, form and flow of the feed inlet

7. Increase the number or size of exhaust ducts

8.Before plastic injection molding, it should be dried to ensure the mixing ratio and reduce impurities

9. Increase the temperature of the barrel and the nozzle to ensure adequate plasticization, and replace the nozzle with a larger aperture

10. Increase the values of injection pressure and speed parameters

11. Increase the setting value of the injection time parameter

12. Increase the setting value of the pressure-holding time parameter

13. Correct the parameter values of the temperature setting to prevent material overflow

14. Adjust the mold temperature and cooling time

15. Reasonably control the dosage of mold release agent to prevent excessive moisture

16. Try your best to reduce the complexity of the products

1.The projected area of the product exceeds the maximum product area allowed by the injection machine

2.The mold is installed incorrectly or subjected to unidirectional force

3.The injection molding machine template is not parallel or the tie rods are unevenly deformed

4.Poor parallelism of the mold or obstruction at the mold edge

5.The parting surface of the mold does not fit well, and the clearance between the cavity and the core or the sliding parts is too large.

6.The plastic has too much fluidity and the feeding amount is too large

7.The cavity material temperature is high, and the mold temperature is too high

8.The injection pressure is too high and the injection speed is too fast

9.The clamping force is not constant or uneven

1.Choose a larger injection molding machine or select products of an appropriate area

Mold

2. Check the installation of the mold and secure and press it tightly

3. Check whether the template and the tie rods are parallel and make corrections to eliminate deformation

4. Clean or grind the mold edges and check the parallelism of the mold

5. Check whether the parting surface of the mold is clean and free of debris, correct the offset or clearance, or replace the parts

6.The feeding amount is properly controlled

7. Control the temperature of the heating melt glue cylinder and the mold temperature

8. Reduce the setting of injection pressure and speed parameter values

9. Adjust the clamping force parameters or correct the symmetry on both sides of the die