posted May 05, 2004 11:14 PM
I'm running PS foam sheet for thermoforming (.040 in). The sheet seems excessively soft meaning not very rigid. I'm running about a 30% regrind for the most part. Using butane as a blowing agent. Tandem extruder with a melt of about 470-480 F. Annular die with a melt of 300-305 F. I have a feeling the primary temps are too high. What is a reasonable temp profile for this process? And if it is not the temps making the sheet soft what could it be? Thanks
posted July 06, 2004 05:12 PM
This melt temperature seems to be too hot. I Will not exceed 450 for this application. Also the amount of nucleating agent takes a very special effect in the characteristics of the foam. Too much nucleating agent the sheet will be soft. Too much nucleating agent and the sheet will be bridle.
posted May 05, 2004 11:14 PM
