Hi all
During hot press I am facing major problems in EPDM composites fabrication. Mixing temperature: 190 degree C for 15 minutes and hot press 200 degree C,. After the hot press, the EPDM cross composite material is sticking with the PI sheets placed up and down of the mould. How to get rid of this problem?. Does anybody have any suggestion?. I haven't added DCP. Is it because of absence of DCP in the cross composites? if yes, Can let me know what is right time to add DCP during mixing and at what temperature?
Regards
Both the films: Underlay and overlay - should be made of Polyimide covered--laminated by Teflon -then there will be no adhesion of cured EPDM to the hot press die - it's a common practice. THUS, you need to use a one-side-laminated by Teflon PI film. There are hundreds of manufacturers of such a films.
Note that such a film withstands about 10 cycles of hot pressing
And then requires replacement.
It also seems to me that the difference between mixing temperatures (190C) and hot pressing (200C) is not enough.
It is more reliable to work if the temperature differs by 20-25 ° C
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