Brittleness is that the plastic part is easily cracked or broken in some place
Causes:
(1) Dry conditions are not suitable; use excessive recycled materials
(2) Injection temperature setting is wrong
(3) The gate and runner system settings are not appropriate
(4) The melting mark strength is not high
Remedies:
Material:
(1) Set appropriate drying conditions before injection molding
(2) Reduce the use of recycled materials and increase the proportion of raw materials
(3) Use high-strength plastic.
Mold design: Increase the size of the main runner, branch runner, and gate
Machine: Choose a well-designed screw to make the temperature distribution more uniform during plasticization
Process:
(1) Reduce the temperature of the material cylinder and nozzle
(2) Reduce back pressure, screw speed, and injection speed
(3) Increase the material temperature and injection pressure, improve the melting strength
