SHENZHEN ELITE TECHNOLOGY CO., LIMITED
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| Common defects / Injection Troubles | Reasons | Trouble Shooting Solutions | |||
|---|---|---|---|---|---|
| Short injection: | increase injection pressure, speed, increase material temperature, mold temperature, and increase the amount of glue. | ||||
| Gas mark | Reduce the flow rate of the melt through the gate and increase the mold temperature. | ||||
| Black spot | 1. The proportion of raw materials is too high 2. The screw is not cleaned 3. Poor workshop environment |
1. Control the proportion of inferior materials and prohibit the mixing of heterochromatic raw and inferior materials 2. Develop phone cover maker machine maintenance, refueling and cleaning check and audit 3. Change the workshop environment and improve the cleanliness of the workshop |
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| Flashing, piping | 1. The injection pressure is too high 2. Insufficient clamping force of mobile cover manufacturing machine 3. The accuracy of the mobile cover making machine is poor 4. Because the employees were not serious in their work and the product was not taken out, the stamper and mold were damaged, causing the product to run away. |
1. Improve the accuracy of the mold, and use high-hardness steel as the mold profile to prevent flash. The quenched and ground precision mold (block-plate combined type) is more reliable against flash. If the hardness reaches about HRC60. Ordinary molds (45 steel) are about to be repaired for about 100,000 molds, and they have been seriously damaged after about 300,000 molds. 2. From the aspect of molding process, the process conditions are mainly set in the direction of reducing fluidity. Reduce injection pressure, lower melt temperature and mold temperature, reduce injection speed, and reduce feed volume. |
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| Weld Line | If excessive release agent is used, the fusion line will become thicker, the release agent is pushed forward by the melt, and the release agent is mixed between the forwards of the two streams, blocking the fusion of the forwards and weakening the mechanical strength. | 1. Control mold temperature and material temperature 2. Adjust the glue flow of each section and add exhaust. |
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| Big gate | 1. The mold temperature is too low; 2. The fluidity of the material is low. 3. The glue position of the product is thin and difficult to remove. 4. Poor mold exhaust |
1. Increase the mold temperature 2. Improve material fluidity 3. Change the position of the gate, generally designed on the thick wall 4. Increase vent holes| |
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| Deformed | 1. Uneven temperature 2. Uneven pressure 3. Molecular orientation 4. Improper gate position |
Control mold temperature to prevent mold temperature differences from occurring Shorten the uneven deformation, adjust the pressure after the process |
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| shrink | A. Improper molding process conditions (when injection pressure is insufficient, mold cooling is insufficient) B. The wall of the product is too thick or uneven C. The shrinkage of the raw material is too large (material problem) D. Shrinkage caused by uneven wall thickness of the product: There is often shrinkage on the back of the stiffener. Due to the uneven wall thickness of the stiffener, when the thickness is less than 50% of the wall thickness of the adjacent material, the shrinkage situation is obviously improved, but the width of the stiffener is at least 1MM, otherwise the mold manufacturing will be difficult, and the boss in the plastic part will have a similar situation |
1. Increase injection pressure 2. Extend the holding time (delay the sol backflow at the gate) 3. A lot of shrinkage is caused by the unreasonable design of runners and gates. To deal with such shrinkage, it is necessary to modify the mold to reduce the shrinkage. 4. For complex and thin-walled products, some need to use gas-assisted technology to control shrinkage when designing and manufacturing molds |
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