Flow lines are molding defects that are wavy on the surface of the product known as a kind of frog jump caused by the slow flow of the melt.
Causes:
(1)Mold temperature and the material temperature is too low
(2) Injection speed and pressure are too slow
(3) The size of the flow channel and gate is too small
(4) Due to the structure of the product, the acceleration is too large when the filling flow is caused.
Remedies:
Mold design:
(1) Increase the size of the cold well in the flow channel
(2) increase the size of the runners and gates
(3) Shorten the size of the main channel or switch to the hot runner
Process:
(1) Increase the injection speed
(2) Increase injection pressure and pressure
(3) extend the pressure holding time
(4) Increase the mold temperature and material temperature
