How To Increase The Brightness Of ABS Injection Molded Parts?

Views: 0 Author: Site Editor Publish Time: 2022-03-14 Origin: Site

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1. Injection mold

1. If the mold cavity is not processed well, such as scars, micro-holes, wear, roughness, etc., it will inevitably reflect on the plastic parts, making the plastic parts have poor gloss. In this regard, the mold should be carefully processed to make the surface of the cavity more Small roughness, polished chrome if necessary.

2. If there are oil stains, water stains on the surface of the cavity, or too much release agent, the surface of the plastic parts will be dark and dull. For this, the oil stains and water stains should be removed in time, and the release agent should be used in limited quantities.

3. If the demoulding slope of the plastic part is too small, it is difficult to demould, or the force during demolding is too large, so that the surface gloss of the plastic part is optimal. For this, the demolding slope should be increased.

4. If the mold exhaust is not good, too much gas stays in the model, which also leads to poor gloss. In this regard, the mold exhaust system should be checked and corrected.

5. If the cross-sectional area of the gate or runner is too small or changes suddenly, the melt will be subjected to too much shearing force when it flows in it, and it will flow dynamically in turbulent flow, resulting in poor gloss. For this, the gate and runner should be appropriately increased. cross-sectional area.

2. Injection molding process

1. If the injection speed is too small, the surface of the plastic part is not dense, and the gloss is poor. For this, the injection speed can be appropriately increased.

2. For thick-walled plastic parts, if the cooling is not sufficient, the surface will be hairy and the luster will be darker. For this, the cooling system should be improved.

3. If the holding pressure is insufficient and the holding time is too short, the density of the plastic parts is not enough and the gloss is poor. For this, the holding pressure and holding time should be increased.

5. If the melt temperature is too low, the fluidity is poor, and it is easy to cause poor gloss. For this, the melt temperature should be appropriately increased.

6. For plastic parts made of crystalline resin, such as PE, PP, POM, etc., uneven cooling will lead to poor gloss. In this regard, the cooling system should be improved to make it cool evenly.

7. If the injection speed is too high and the gate cross-sectional area is too small, the vicinity of the poured product will be dark and the gloss will be poor. For this, the injection speed can be appropriately reduced and the gate cross-sectional area can be increased.

3. Raw materials

1. The difference in particle size of raw materials is large, which makes it difficult to plasticize uniformly, and the gloss is poor. In this regard, the raw materials should be screened.

2. Too much recycled material or nozzle material is added to the raw material, which will affect the uniform plasticization of the melt and cause poor gloss. In this regard, the amount of recycled material or nozzle material added should be reduced.

3. Some raw materials will decompose and discolor during temperature adjustment, resulting in poor gloss. For this, raw materials with better temperature resistance should be selected.

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

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

6. The raw materials are mixed with foreign matter, miscellaneous materials or incompatible materials. They cannot be evenly mixed with the raw materials, resulting in poor gloss. For this, these miscellaneous materials 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 lubricant should be appropriately increased.