News

What should I do when TPE material lagging PC cracks?

Release time:

2021/08/05

Source:

Website

Recently, many customers have asked, "What should I do if the TPE lagging PC material I use cracks", in fact, there are different understandings on this issue, is it the cracking of the part responsible for the TPE lagging or the cracking of the PC part? Generally speaking, the problem encountered by customers is that there are more problems with PC parts.

First of all, let's figure out the reasons for the cracking and cracking of PC and TPE:

PC: The problem of cracking of PC (polycarbonate) is relatively common, and anyone who is familiar with engineering plastics should know this. The cracking problem of PC products is caused by the internal stress of the products, and the forced molecular orientation of PC materials occurs during molding, and after molding and cooling, there is a benzene ring structure with poor compliance, so it is difficult to solve the molecular orientation.

Therefore, improper treatment during the molding of PC products, such as low mold temperature setting and insufficient cooling and pressure holding time, will cause cracking of PC products.

When using TPE overmolded overmolded PC material. There is a large internal stress inside the PC part, this kind of internal stress is just reflected in the TPE lagging time, when the TPE material is used to lagging the glue, the area of the TPE lagging part is too large, the TPE enveloping layer shrinks during the lagging process, and the thickness of the PC part is relatively thin at the same time, and the shrinkage of the wrapping layer plays a mutual role in the effect of internal stress, so that the PC product cracks.

Therefore, when forming PC parts, it is necessary to use high mold temperature, appropriately extend the cooling time of pressure holding and molding, and reduce internal stress.

TPE: When the TPE wrapping layer cracks, it usually occurs after a period of time after overmolding, and the main reason for this situation is that the aging resistance of the TPE material is poor, and it is easy to crack after a long time.

Therefore, TPE materials with good aging resistance should be used to improve the aging and cracking resistance of TPE materials.

The above is the solution to the cracking of TPE lagging PC material shared today, if there are other common problems about TPE materials and want to know and consult, please go to the official website of Dongguan Guofeng Plastic Industry to leave a message, or call the official website hotline to get in touch with us!

Key words：

Precautions for thermoplastic elastomers when injection molding!