The following injection mold problems can be solved to increase the brightness of ABS plastic products.
First, Injection mold issues for ABS plastic products
1. Poor processing of injection mold cavity of the ABS plastic products
If the mold cavity has scars, microporous, wear, roughness, and other deficiencies will inevitably react to the plastic parts, so that the plastic parts luster is not good, for this, to carefully process the mold, so that the surface of the cavity has a small roughness, if necessary, polishing chrome plating.
2. Cavity surface stains ABS plastic products mold
If the surface of the cavity has oil, water stains, or too much mold release agent, it will make the surface of the plastic parts dark, no luster, in this regard, to remove the oil and water stains, and limit the use of mold release agent.
3. The slope of mold release is too small
Mold release slope is too small will cause difficulties to release the mold or too much force to release the mold so that the surface of ABS plastic products gloss is good, to increase the mold release slope.
4. Poor exhaust of the mold of ABS plastic products
If the exhaust is not good, it will cause too much gas to stay in the model, which will also lead to bad luster, for this, check and correct the mold exhaust system.
5. Improper gate or runner design of ABS plastic products mold
The gate or runner cross-sectional area is too small or suddenly changed, the melt flowing in which the shear force is too large, is turbulent dynamic flow, resulting in bad luster, which should be properly increased gate and runner cross-sectional area.
Second, The injection molding process of ABS plastic products
1. ABS plastic products injection speed is too small
The injection speed is too small, resulting in the surface of the plastic parts is not dense, appearing bad luster, in this regard, the injection speed can be increased appropriately.
2. Inadequate cooling of ABS plastic products
If the cooling of thick-walled plastic parts is not sufficient, the surface will be hairy and the luster will be dark, in this regard, the cooling system should be improved.
3. Improper pressure-holding operation of ABS plastic products mold
If the holding pressure is too small, the holding time is too short, so that the density of plastic parts is not enough and the luster is not good, which should increase the holding pressure and holding time.
4. If the melt temperature is too low
When the melt flow is too low, making poor mobility easily leads to bad luster, which should be appropriate to improve the melt temperature.
5. Uneven cooling of the crystalline resin
Such as PE, PP, POM and other plastic parts, such as uneven cooling will lead to poor gloss, in this regard, the cooling system should be improved to make it uniform cooling.
6. ABS plastic products' Injection speed and gate area do not match
If the injection speed is too large and the gate area is too small, the luster near the gate will be dark and bad, which can reduce the injection speed and increase the gate area.
Third, ABS plastic products of raw materials
1. Large differences in particle size of raw materials
Large differences in particle size make it difficult to plasticize uniformly, and the luster is not good, in this regard, the raw materials should be sieved.
2. Too much secondary material in raw material
Such as recycled material or water mouth material added too much, affecting the uniform plasticization of the melt and bad luster, which should reduce the amount of recycled material or water mouth material added.
3. Raw material temperature resistance is bad
Some raw materials will decompose and change color when adjusting the temperature, resulting in a bad luster, which should be selected with a better temperature resistance of raw materials.
4. Raw materials containing volatile substances
If the moisture or volatile content of raw materials is too high, volatile gas when heated, condensation in the cavity and melt, resulting in the poor luster of plastic parts, which should be pre-drying raw materials.
5. Additive dispersion is not good
The dispersion of some additives is too poor and makes the plastic parts bad luster, which should be replaced with additives with better fluidity.
6. Impure raw materials
Such as raw materials mixed with foreign materials, miscellaneous materials, or insoluble materials, they cannot be mixed with their raw materials evenly together and lead to bad luster, which should be strictly excluded in advance these miscellaneous materials.
7. The amount of lubricant is too little
If the amount of lubricant is too little, the fluidity of the melt is poor, and the surface of the plastic part is not dense, which makes the luster bad, for this, the amount of lubricant should be increased appropriately.
According to your mold polish degree to meet the requirements, if the mold itself is no problem, to determine the characteristics of your ABS Plastic Products to determine, you can choose high mold temperature, high speed, and high pressure; with frozen water can also achieve the degree of finish.
Besides the How to Increase the Brightness of ABS Plastic Products article, you may also be interested in the below.
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