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Reasons for poor gloss of plastic parts

Update:19 Jan 2019
Summary:

1. The difference in the particle size of the raw mater […]

1. The difference in the particle size of the raw materials is large, making it difficult to uniformly plasticize and the gloss is poor. For this, the raw materials should be sieved.

2. The regeneration material or the nozzle material in the raw material is added too much, which affects the uniform plasticization of the melt and the gloss is poor. Therefore, the amount of the recycled material or the nozzle material to be added should be reduced.

3. Some raw materials will decompose and change color when temperature is adjusted, resulting in poor gloss. For this, raw materials with good temperature resistance should be used.

4. The content of moisture or volatile matter in the raw material is too high, and volatilizes into a gas when heated, and condenses in the cavity and the melt, resulting in poor gloss of the plastic part. For this, the raw material should be pre-dried.

5. The dispersibility of some additives is too poor and the gloss of the plastic parts is poor. For this, the additives with better flow properties should be used instead.

6. Raw materials are mixed with foreign materials, miscellaneous materials or incompatible materials. They cannot be uniformly mixed with their raw materials and cause poor gloss. For this, these impurities should be strictly excluded in advance.

7. If the amount of lubricant is too small, the fluidity of the melt is poor, and the surface of the plastic part is not dense, resulting in poor gloss. For this, the amount of the lubricant should be appropriately increased.

https://www.solidcomould.com/