Disc die for blown film grows to 18 in. diam.The modular disc blown film die was commercialized by BBS (1) (Bulletin Board System) A computer system used as an information source and forum for a particular interest group. They were widely used in the U.S. 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 flows, 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 LDPE abbr. low-density polyethylene and Topas cyclo-olefin copolymer (COC See chip on chip. ) from Topas Advanced Polymers Inc., Florence, Ky. Topas wants to compare stiffness and other properties of microlayer films with 14% and 25% COC to monolayer mon·o·lay·er n. 1. A film or layer one molecule thick formed at the interface between water and either oil or air by a substance such as a partially esterified fatty acid that contains both hydrophobic and hydrophilic groups in the same films made from LDPE/COC blends. BBS: (864) 579-3058/e-mail bbsc@infoave.net * Topas: (859) 746-6447/www.topas.com [ILLUSTRATION OMITTED] |
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