What should I pay attention to for environmentally-certified tableware?
2021-12-31
What are the factors that affect the molding shrinkage of thermoplastic?
- Categories:Company news
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- Time of issue:2020-06-08 14:30
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(Summary description)In the forming process of thermoplastic, there are many factors, such as the volume change from crystallization, the strong internal stress, the large residual stress frozen in the plastic part, and the strong molecular orientation. Therefore, compared with thermosetting plastics, the shrinkage rate is larger, the range of shrinkage rate is wide, and the directionality is obvious. In addition, the shrinkage rate after forming, annealing or humidity regulating treatment is generally higher than that after thermosetting Sex plastic is big. The outer layer of the melt contacting with the surface of the mold cavity immediately cools to form a solid shell with low density. Due to the poor thermal conductivity of plastic, the inner layer of plastic parts is cooled slowly to form a high-density solid layer with large shrinkage. Therefore, those with thick wall, slow cooling and high-density layer will shrink greatly.
What are the factors that affect the molding shrinkage of thermoplastic?
In the forming process of thermoplastic, there are many factors, such as the volume change from crystallization, the strong internal stress, the large residual stress frozen in the plastic part, and the strong molecular orientation. Therefore, compared with thermosetting plastics, the shrinkage rate is larger, the range of shrinkage rate is wide, and the directionality is obvious. In addition, the shrinkage rate after forming, annealing or humidity regulating treatment is generally higher than that after thermosetting Sex plastic is big. The outer layer of the melt contacting with the surface of the mold cavity immediately cools to form a solid shell with low density. Due to the poor thermal conductivity of plastic, the inner layer of plastic parts is cooled slowly to form a high-density solid layer with large shrinkage. Therefore, those with thick wall, slow cooling and high-density layer will shrink greatly.
What are the factors that affect the molding shrinkage of thermoplastic?
(Summary description)In the forming process of thermoplastic, there are many factors, such as the volume change from crystallization, the strong internal stress, the large residual stress frozen in the plastic part, and the strong molecular orientation. Therefore, compared with thermosetting plastics, the shrinkage rate is larger, the range of shrinkage rate is wide, and the directionality is obvious. In addition, the shrinkage rate after forming, annealing or humidity regulating treatment is generally higher than that after thermosetting Sex plastic is big. The outer layer of the melt contacting with the surface of the mold cavity immediately cools to form a solid shell with low density. Due to the poor thermal conductivity of plastic, the inner layer of plastic parts is cooled slowly to form a high-density solid layer with large shrinkage. Therefore, those with thick wall, slow cooling and high-density layer will shrink greatly.
- Categories:Company news
- Author:
- Origin:
- Time of issue:2020-06-08 14:30
- Views:
Information
In the forming process of thermoplastic, there are many factors, such as the volume change from crystallization, the strong internal stress, the large residual stress frozen in the plastic part, and the strong molecular orientation. Therefore, compared with thermosetting plastics, the shrinkage rate is larger, the range of shrinkage rate is wide, and the directionality is obvious. In addition, the shrinkage rate after forming, annealing or humidity regulating treatment is generally higher than that after thermosetting Sex plastic is big. The outer layer of the melt contacting with the surface of the mold cavity immediately cools to form a solid shell with low density. Due to the poor thermal conductivity of plastic, the inner layer of plastic parts is cooled slowly to form a high-density solid layer with large shrinkage. Therefore, those with thick wall, slow cooling and high-density layer will shrink greatly.
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