Injection machine injection screw, the best screw barrel, the cause of screw damage

① The temperature is low when the raw materials are plasticized.

② Metal foreign materials are mixed in the raw materials or there are many impurities in the raw materials.

③ The screw idle running time is too long.

④ The choice of material for manufacturing screw is unreasonable.

⑤ Low screw manufacturing accuracy and low heat treatment hardness of thread working surface.