How to solve the surface sag in 2k mold
                     How to solve the surface sag i
n 2k mold
During the process of molding, the surplus 
material is spilled into the gap between the 
mold and the mold surface and retained on 
the plastic part. 
A kind of linear trace on the surface of plastic 
parts, is by the injection or extrusion of a 
number of streams of material in the desert 
diverging 
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confluence, melting at 
the interface is not 
fused, each other 
cannot be fused as 
one, resulting in fusion 
imprinting, affecting 
the appearance of 
plastic parts and 
mechanical properties.
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When the wall thickness of the product 
is large, the cooling speed of the outer 
surface is faster than that of the center 
part. Therefore, with the cooling 
process, the resin in the center part 
shrinks and expands to the surface, 
resulting in insufficient filling in the 
center part.