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Home » Milastomer™ Thermoplastic Vulcanizate (TPV) Processing
Milastomer™ Thermoplastic Vulcanizate (TPV) Processing

Milastomer™, thermoplastic Vulcanizate (TPV), contains no hygroscopic filler, so there is no need to dry prior to processing. The material can be processed using injection or extrusion molding.

Injection Molding

Milastomer™ has good fluidity and low crystallinity, enabling the development of products with nice aesthetics because it is difficult for sink marks to form at ribs and parts with uneven thickness, and welds tend not be conspicuous. Spruces, runners, burrs, and scraps can be reused. The thermal stability of Milastomer™ is good and corrosive gases tend not to be produced even by thermal decomposition. General purpose molding machines are suitable for processing.

Machine: General purpose injection molding machine
Mold and shrinkage factor: Low hardness grades have fluidity inferior to high hardness grades necessitating the design of spruces, runners and gates to be shorter and larger. The mold shrinkage factor varies, depending on the processing conditions and product form, from 10/1000 to 16/1000.
Processing conditions: Standard processing conditions are shown below, however adjustments may be necessary dependent on product shape.
  Product wall thickness Cooling time
1 Cylinder temperature C1/C2/C3/N=200/220/220/220 (°C)
2 mm
3 mm
20 sec
30 sec
2 Die temperature 30-50 °C 4 mm 40 sec
3 Injection Speed Set comparatively slow 5 mm 50 sec
4 Cooling time Varies depending on product shape and die temperature. Product wall thickness and standard cooling times are given in the table at right.

Extrusion Molding

Milastomer™ has comparatively high melt viscosity, low temperature dependence of viscosity and relatively small die swell, facilitating extrusion molding of an odd shape with complex profile. Odd shapes with complex profiles are difficult to mold with conventional polyolefin resin.

Machine: A general purpose machine for polyolefin can be used. Ideal specifications are an L/D ratio of 24 or more, and a metering type screw with a compression ratio of 3-4. To obtain a good appearance, the resin must be adequately and uniformly plasticized by, for example, using a screen pack (80-120 mesh).
Dies:
Plate dies are used for odd shaped extrusion, and a land length of about 10mm is appropriate. Land length must be adjusting by engraving from the backside at thin-walled parts where it is difficult to achieve the desired shape.
Sizing Equipment (Calibrator):
Sizing equipment may have to be used, depending on the product shape and required dimensional precision.

Other

If you are considering other types of molding such as blow molding, calendar molding, thermal fusion bonding, vacuum molding, and foaming, please contact Mitsui Chemicals America.

 

 

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