The Wiman Group in Sauk Rapids, Minn. (acquired last Sept. by RTP Co., Winona, Minn.), recently developed new technology to bond film or thin-gauge sheet mechanically to woven, knitted, or looped fabric without adhesive. For 30 years Wiman has used a proprietary non-adhesive, mechanical process to bond cast film and sheet in-line to nonwovens using the retained heat in the film or sheet. But Wiman couldn't bond film to weaves and knits, which have fewer contact points. Adhesiveless lamination is used for medical applications where adhesives can cause skin irritation. The fi lms are primarily PVC and some polyolefi ns, but work is under way with TPU. Wiman laminates 5- to 20-mil fi lms to fabrics. RTP's new sheet and film division is working on fabric laminates with PBT or TPE sheet using Wiman technology. Tel: (320) 259-2554 . www.rtpcompany.com
RTP Co., Sheet & Film Div.
580 E. Front St. Winona, MN 55987
Phone (507) 454-6900 Fax (507) 454-4629