The modular disc blown film die was commercialized by BBS Corp., Spartanburg, S.C., in the late 1990s in small sizes (up to 9 in. diam.), mostly for R&D applications. Now it has been scaled up to 18 in. diam. The larger die has 25 disc cells to make film with 25 microlayers from three extruders (two 65-mm, one 50-mm). Melt from each extruder is split in three for a total of nine melt fl ows, each directed through one of the 25 cells. Output is up to 800 lb/hr. A smaller 9-in., 25-layer die in BBS's lab is running trials with alternating microlayers (see microscope view below) of LDPE and Topas cyclo-olefi n copolymer (COC) from Topas Advanced Polymers Inc., Florence, Ky. Topas wants to compare stiffness and other properties of microlayer fi lms with 14% and 25% COC to monolayer fi lms made from LDPE/COC blends. BBS: (864) 579-3058/e-mail firstname.lastname@example.org . Topas: (859) 746-6447/www.topas.com
Topas Advanced Polymers, Inc.
8040 Dixie Highway Florence, KY 41042
Phone (859) 746-6447 Fax (859) 520-4404