Share the precautions when cleaning the screw of Haitia […]
Share the precautions when cleaning the screw of Haitian injection molding machine. The screw of Haitian injection molding machine usually adopts a "single thread" design, that is, the size and shape of the thread remain unchanged from the beginning to the end on the screw, and it is not special according to the mixing requirements of raw materials. Segmented design. Therefore, in the injection molding process of pre-colored polymers that do not require special mixing capabilities, we can see that general-purpose screws are commonly used. In other injection molding processes, special screw designs are necessary. As for extrusion processing, we rarely see general-purpose screws being used.
Matters needing attention when cleaning the screw of Haitian injection molding machine:
① Prepare ventilation conditions, because smoke will be generated during processing.
②Rotate the screw at a constant speed to evenly heat the surface. Do not heat the screw only at a certain point, otherwise the thermal stress on one side will cause the screw to twist and deform.
③The screw temperature should not exceed 400℃ (including the thread), otherwise it will reduce the screw hardness and wear resistance. ④ Special care should be taken when handling the non-return ring, because the thin-walled part on the non-return ring has a faster heating temperature. ⑤ Use a wire brush to clean the screw of Haitian injection molding machine, and polish the surface of the screw with emery cloth (sand grade 240-280). ⑥ Use flame to burn off the residual material on the internal thread (left-hand thread), and then thoroughly clean the thread with a wire brush.
⑦When screwing on the screw head, apply HSC ointment. Do not use other types of lubricating oil or grease to lubricate the screw threads. These lubricants will undergo coking reaction at high temperatures, leaving residues that may jam the screw head.
⑧ Avoid letting hard objects hit the screw, causing the screw to crack or break.
⑨When repairing, especially when repairing the screw and barrel of the heated Haitian injection molding machine, you must wear a protective mask and glasses.
The screw is an important part of the injection molding machine. Its function is to transport, compact, melt, stir and press plastic. All of this is accomplished by the rotation of the screw in the barrel. When the screw rotates, the plastic will generate friction and mutual movement on the inner wall of the barrel, the bottom surface of the screw groove, the screw edge advancement surface, and the plastic and the plastic.