1) Incomplete Fillings:
a) not enough resin to fill the mold completely
b) inadequate injection stroke
c) low injection rate
d) low injection pressure
e) resin viscosity too high
f) exotic geometry

 2) Surface Imperfections:
a) moisture or air bubbles in the resin
b) temperature too high causing resin decomposition
c) not enough pressure to fill the mold completely
d) dirty mold

3) Burned Parts:
a) temperature too high
b) polymer trapped and degraded in the nozzle
c) slow chilling cycle

4) Warped Parts
e) uneven mold surface temperature
f) design flaws
g) parts removed from the mold too early       

    About First-rate Mold Solution Co., Ltd.
First-rate Mold Solution Co., Ltd. in China, provide industry design,mold design,mold manufacturing,molding analysis,project management service.

 About www.firstratemold.com
our website has a lot of professional knowledges in mold industry in blog and news, also we are interested in CAD/CAM/CAE, such as AUTOCAD,UGNX, PRO/E,CATIA, CIMATRON, SOLIDWORKS, MOLDFLOW and so on,we welcome professional engineer,mold maker and someone who are interested in injection molding,plastic product,injection mold and mold industry to our section of blog and news,we would like to share with them.