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What is the reason for silver streaks in transparent injection molding?

by:Vowin Rapid Prototyping     2023-02-14
Clear injection molding is one of the common types in plastic processing. In people's life, some transparent plastic products are often used, especially some transparent boxes. Because it is so common, it also brings a huge market for transparent injection molding.

In the process of transparent injection molding, it is inevitable that there will be some defective products, such as silver streak products, so what is the reason for silver streaks in transparent injection molding?
1. In terms of machines:

① There are dead angles in the material barrel and screw wear or rubber head and rubber ring, which will decompose after long-term heating.

②The heating system is out of control, resulting in excessive temperature and decomposition.

2. Mold:

① Poor exhaust.

②The frictional resistance of runners, gates, and cavities in the mold is large, resulting in local overheating and decomposition.

3. Plastic:
①The plastic has high humidity, too much recycled material is added or harmful debris is added.

② Add lubricant and stabilizer to the plastic or the amount of stabilizer is too large or mixed unevenly, or the plastic itself contains volatile solvents. Mixed plastics can also decompose when heated to a level that is difficult to balance.
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