Bi-layer tanks using Petro-SealTM technology can be manufactured in one step using a conventional drop-box. Suggested procedures follow:
Fill mold with specially-modified polyethylene (available through Arkema)
Fill drop box with specially-modified Rilsan® PA 11.
Use oven temperature of 300°C.
Use rotation ratio of 4:1
Drop Rilsan® PA 11 from drop box at 150°C inner air temperature
Cease heating phase at PIAT 210-215°C.
Cooly rapidly with water.
High levels of water cooling are necessary to prevent shrinkage voids. Increased cooling rates decrease processing time. With Petro-SealTM technology, warpage and adhesion are not of concern.
Demold at 70°C
Other Notes:
Manual methods can be used effectively in lieu of dropbox
Tanks can be molded with Rilsan® Polyamide 11 interior or exterior. Rilsan® PA exterior does not require water cooling.
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