This invention discloses a method for manufacturing asymmetrical extruded blow-molded hollow plastic parts.
The preform is extruded using blow molding machinery for hollow plastic extrusion.
Before the preform enters the blow mold, the temperature of the preform is regulated.
Forced cooling methods such as localized blowing of cold air and spraying of water are used to lower the temperature of localized parts of the blank with large deformation, so as to reach the process control temperature.
Multiple areas of the blank can be cooled by blowing cold air or spraying water locally.
Maintain natural cooling for other parts of the blank; ensure that the temperature of the parts with smaller deformation is higher than the temperature of the parts with larger deformation.
The preform is placed in a blow molding die, the die is closed, and blow molding is performed to obtain a hollow plastic part.
This invention can significantly improve the wall thickness uniformity of asymmetrical extruded blow-molded hollow plastic parts, increasing the wall thickness of areas with large deformations such as corners and arcs; it effectively prevents leakage and perforation at corners and arcs during long-term use, thus improving their service life.
Country Code: CN
Application Number: CN200910191501.1
