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typical mold shrinkage values
(%)
Shore
Value:
1 A 2.1 – 3.5 2.1 – 3.0 18 A 1.8 – 2.0 1.8 – 2.0 40 A 1.4 – 1.5 1.4 – 1.5 60 A 1.3 – 1.4 1.4 – 1.5 80 A 1.1 – 1.2 1.3 – 1.4
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suggested startup conditions
Shore A 20 or below
Rear Zone: 285 - 355 F Front Zone: 325 - 395 F Nozzle: 325 - 395 F Mold: 70 - 90 F Back Pressure: 50 - 150 psi |
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Shore A 20 – 40
Rear Zone: 325 - 345 F Front Zone: 345 - 365 F Nozzle: 365 - 385 F Mold: 50 - 90 F Back Pressure: 25 - 75 psi |
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Above 40A
Rear Zone: 360 - 380 F Front Zone: 390 - 410 F Nozzle: 420 - 430 F Mold: 100 - 140 F Back Pressure: 80 - 150 psi |