Progress in molding technology of polyimide tubular film;

This paper presents a brief introduction to its composition,types,mechanical and physical properties,range of application and the molding technology.

There are two types of fluid-assisted injection molding technology——gas-assisted and water-assisted injection molding.

Different methods of powder alloy moulding and the moulding technology principle of ceramics are stated respectively.

We focus on describing the new processing technology of metallocene polyolefins and it's equipment in the aspects of the electro magnetic dynamic technology, internal cooling system,mold and screw.

It was compared with some others forming techniques as well.

This thesis introduces a shaping technology of the curved tubing used in a new manufacture process of composite elbow.

It introduces three stages of forming technology for high frequency welded pipe as per time period and the development of forming method,namely,roller forming technology in earlier period,cage-roll forming technology in the late of 20th century 60's,and FFX forming technology in the late 20th century 90's,and also describes developing process,advantage and disadvantage of all forming technology.