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Plastic Extrusion Tooling design criteria

Plastic Extrusion Tooling design criteria

Extrusion thermoplastic elastomer design includes the design of geometric parameters (such as wall thickness, rib, radius, hollow and hinge), taking into account their processing and performance will have any effect. Following is a list of general guidelines for extrusion design. 

Wall thickness 

Uniform or nearly uniform thickness section with more ease of processing, lower costs, better error control, better surface finish and more complex shapes. Minimum wall thickness of 0.5 mm (0.02 ") and a maximum wall thickness of 9.5 mm (0.375"). Thinner wall thickness is possible, but need to use santoprene8000 thermoplastic elastomer series. Changes in wall thickness to be fairing a smooth and should be as small as possible, as this will help balance stamping die. 

Tendon 

Changes in the thickness of the process, if the thickness is too intense too,the process of balancing the flow problems may arise. Rib thickness should be 50% of the nomrnal wall thickness, radius should be designed on this basis. 

Radius 

Dramatic changes in the local use rounded corners instead of the transition.Out of the radius of the smallest components are 0.20mm (0.007 "). 

Hollow 

In the cross-section may be hollow in cross section. Extrusion die may at first it will have a hollow cross section shape, when in the cooling section can be hollow in order to maintain the shape of the use of compressed air, another method is to use an external vacuum extruder to help maintain the shape of hollow cross section. More hollow sections made of mold design becomes more complex, the contour shape becomes more difficult to maintain. Unless the design requirements, hollow section should be minimized or even all avoid. In the process of extrusion to the wall within the hair is a means of cooling components. Tpv thermoplastic elastomers can be by chemical and mechanical methods to blister.Chemical foaming, can be used, such as re-foaming agent like hydrochloric acid salt. The foam density can reach 0.97 specific gravity (typically not sparkling tpv) to 0.70. Impact of lower density by the patent. Foaming agent at 180 ℃ to 190 ℃ under which degradation, because most tpv is based on the 195 to 215 ℃ under the conditions of.  For the mechanical method, water is the role of media. Here, called "water bubble" technology is a patented technology. Need special equipment to get the same foam structure and density. Reduce the density from 0.97 to 0.20. Within this context, the density can be obtained by controlling the processing technology to. Density decrease will affect the mechanical properties, so it is classified as application designs. 

 



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