Thick-walled plastic parts processing shrinkage problem analysis and solutions

The processing of thick-walled plastic parts is prone to shrinkage problems due to their large volume and high thickness. This is due to the influence of heat during the processing of plastic parts, the structure of the intermolecular changes, which leads to a reduction in volume. This phenomenon is especially obvious in thick-walled plastic parts processing, because thick-walled plastic parts in the cooling process, the cooling speed of the inner and outer walls are different, resulting in the difference in stress between the inner and outer walls, which leads to the phenomenon of shrinkage.

List some possible solutions to the above problems:

1. Control of processing temperature and time of plastic parts

Processing temperature and time have a direct effect on the molecular movement of the plastic. If the processing temperature is too high or the time is too long, it will cause the movement of plastic molecules to be too violent, thus producing shrinkage. Therefore, we need to reasonably control the processing temperature and time according to the specific characteristics of the plastic material.

2. Adjust the cooling conditions of plastic parts processing

Cooling conditions also have an important effect on the shrinkage of plastic parts. If the cooling is too fast, it will lead to too large a difference in stress between the inner and outer walls, resulting in shrinkage. Therefore, we can reduce the shrinkage phenomenon by adjusting the cooling conditions, such as changing the cooling air speed, changing the cooling method and so on.

3. Use appropriate mold design and manufacturing technology

Mold design and manufacturing technology will also have an impact on the shrinkage of plastic parts. For example, we can design a mold with smooth inner wall and textured outer wall, which can reduce the stress difference between the inner and outer wall, thus reducing the shrinkage phenomenon.

4. Selection of suitable plastic materials

Different plastic materials have different thermal stability and shrinkage. Therefore, we can choose the plastic material with appropriate thermal stability and shrinkage rate according to the requirement of the product.