<?;xml version="1.0" encoding="utf-8"?> Переработка литьем под давлением

Injection molding

Equipment:

Standard equipment is used for processing of thermoplastic elastomers of PlastComposite Materials by injection molding method - plastics processing machines with universal screw for processing of poliolefines (L/D = 20, compression degree 2,5:1 - 3,5:1). 

Injection pressure:

Thermoplastic elastomers of PlastComposite Materials can be processed in the wide range of pressure. To provide the quick filling of mold it is recommended to keep pressure at about 100 MPa.

Speed of screw rotation and value of return pressure:

Speed of screw rotation is recommended to be 25-75 rpm. Return pressure (material back pressure) should be at the minimum (lower than 0.5 MPa). 

In case of self dying of material w ith masterbatch the value of return pressure should be increased to provide more qualitative mixing.

Material drying:

TPE-S materials on base of SEBS/SBS don't require preliminary drying (at normal storage conditions). In case the material absorbed some moisture (during transportation, package was not tight, temperature drop etc) the material should be dried during 2 hours at 80-90°C.

TPV and TPO materials require preliminary drying during two hours at 80-90°C.

Barrel cleaning:

Thermoplastic elastomers of PlastComposite Materials are heat stable. In case of machine shut dow n cleaning of material barrel is not required. For cleaning purpose (if necessary) it is recommended to use pure polypropylene (PP) or polyethylene (PE).

Secondary material processing:

Thermoplastic elastomers of PlastComposite Materials are 100% secondary processed. It possible to add up to 20% of secondary material of total mass of primary thermoplastic. When material having hardness less than 80 Shore A is crushed increased cooling or sharp blades should be required.

Processing modes:

 Material

 Hardness

Temperature modes of processing,°C

Zone 1

Zone 2

Zone 3

Zone 4

Mold

TPE-S materials on base of SEBS/SBS

less than 55 ShA

140 - 160

150 - 170

160 - 180

170 - 180

20 - 40

55 - 85 ShA

150 - 170

160 - 180

170 - 190

180 - 190

20 - 40

more than 85 ShA

160 - 180

170 - 190

180 - 190

190 - 200

20 - 50

TPV/TPO

55 - 85 ShA

170 - 180

180 - 190

180 - 200

190 - 210

20 - 50

more than 85 ShA

170 - 180

180 - 190

180 - 210

190 - 220

20 - 50