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Plastic parts appear cracked white, this solution properly!
 
First, what is cracked white?
Cracked gas white: Cracking is a more common plastic products defects, including parts of the surface of the filamentous cracks, micro-cracking, top white, cracking and sticking due to the workpiece parts, runway sticking caused by trauma, according to the cracking time Divided into mold release cracking and application.
The main reason is due to stress deformation (mainly residual stress, external stress and external environment caused by stress deformation). as the picture shows
  
Second, how to improve?
1. Material aspects:
Proper use of mold release agent, pay attention to the frequent elimination of the mold attached to the aerosol and other substances;
Forming the material before the full drying process;
Be careful not to crack the choice of paint and thinner.
2 molding process:
Avoid plasticizing phase feed into the air bad;
Increase the melt temperature and mold temperature, to ensure that the melt flow, based on the injection pressure should be minimized;
Reduce the screw speed, injection speed, slow down the initial speed of the melt through the gate, the use of multi-stage injection;
Adjust the mold opening speed and pressure, to avoid the rapid pull products caused by mold release cracking;
Avoid cracking due to welding, plastic degradation caused by strength everywhere cracking;
Cracking is reduced by eliminating internal stress by annealing immediately after forming.
If the surface has been cracked plastic parts, you can consider taking the annealing method to be eliminated. Annealing treatment to less than the plastic deformation temperature of about 5 ℃ temperature, fully heated plastic parts 1 hour or so, and then slowly cooled, it is best to crack the plastic parts immediately after the formation of annealing treatment, which have Help to eliminate cracks. However, residual cracks in the cracks left in the paint solvent is very easy to make the cracks developed into cracks.
Article link: the plastic online http://info.21cp.com/Zhipin/Zixun/201710/1346409.htm
Date: 2017/11/13 Read:1676times
 
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