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The reason for transparency defects of injection molds
Upadta time:2013/12/2 10:07:31

Not all subjects are perfect, why do common-used injection molds have transparency defects? let's analyse the reasons. The transparency defects reasons: welds spots, silver marks, crack polystyrene and transparent products of PMMA material, through which the sparkling silver marks can be seen under light. The sliver marks is called cracks, the stress is caused by tensile stress, and makes polymer molecule flow at stress direction, and the difference in refractive index between stress direction and without stress direction, silver marks appear between the two interfaces under light.

1) remove the interference from gas and other impurities, and get the plastic material fully dried;
2) Reduce material temperature, adjust barrel temperature stage by stage, and increase mold temperature properly;
3) Increase injection pressure and reduce injection speed;
4) Increase or reduce pre-back pressure and reduce screw speed;
5) Improve sprue and cavity venting;
6) Clear possible blocked gate, sprue and runner.

Professional injection mold,die casting mold,plastic products OEM manufacturer.

With more than 20 years industrial experience in the field of  injection mold and die casting mold, we can provide  the one-stop service including design and development, mold fabrication, production, products processing etc.


Dongguan Yongsheng Hardware Plastics Product Co.,Ltd All rights reserved
Fax number: +86-769-8534 4896 Customer service hotine: +86-769-8554 4196 Email:sales-fb@alwinasia.com
Xin an Community,Chang an,Dongguan City,Guangdong Province,China.
Keywords: plastic molds,injection mold,mold for plastic,mold injection,injection molding