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Article: PP becoming strong contender.(Blown Film Technology)
- Article from:
- Plastics & Rubber Asia
- Article date:
- March 1, 2004
CopyrightCOPYRIGHT 2004 Plastics & Rubber Asia Ltd. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Polypropylene (PP) is generally quite difficult to convert into film on the conventional upward blown film extrusion mainly due to its poor melt strength, long cooling time and somewhat inferior optical properties. The thicker or heavy-duty PP film is produced from special PP grades of higher molecular weight and higher amount of other co-monomers. However, blown PP film has not yet been commercially developed to replace LDPE/LLDPE films.
Raw material producers have developed some specific PP grades like Dow's Inspire 114 grade that can be processed on conventional upward film extrusion. One of the grades from Borealis, which is known as RB707F, is a terpolymer ...