The processing technology of twinextrusion diehead for PVC profile shapes and pipes,namely the technology of one extruder extruding twin product at the same time,was introduced.

The application of infrared spectrograph to the production of PVC profiles;

Two problems concerning the plastification quality of PVC profiles;

The article has described toughening mechanism of nanometer CaCO3, Application of nanometer CaCO3 in PVC profiles and compared with conventional particle CaCO3 in PVC profiles.

s: Based on the plastics property, the important functions of lubricants in PVC profile formul￣ation, and how to choose the proper lubricant formulation system were described.

The extrusion technology of PVC profiles was discussed from the aspects of the temperature controlling range, the formulation system, the compounding technology, the equipment performance, the technological system, etc.

On the basis of practical experience in production,this paper described the characteristics of production and use of PVC profile shapes in frigid district in several aspects,including formula system,manufacturing process,use,etc.

This paper analyzed the section structure of PVC profile shapes and tested the different results of different section structure of PVC by using falling ball impact test at low temperature (-10℃) and discussed how to reasonably design the section structure of profile shapes.

The formula of PVC-U profiled materials was very complicated and the raw materials commonly used were usually more than 10 kinds.

Low temperature tup impact property of plastic profile shapes and dimension change rate of main profile shapes after heating are two typical technical indexes among 15 testing indexes stipulated in standard GB/T 8814-2004 "Non-plasticized PVC-U for door/window".