1. According to the operation plan single selected in accordance with the single mold, die: 460 ℃ -- 480 ℃. Die: 480 ℃ -- 500 ℃. Mould stay time the longest do not exceed 8 hours in the furnace, mold process should be fast fast, and to prevent the mold cooling.

2. The spindle tube must be kept clean, no serious wear and tear or pot-bellied, otherwise, extrusion products will appear slag or bubble.