Sealed Seams for Fluid, Vapor and Air Barrier Articles

Market Overview:

Composite films are required to light-weight and durable in order to be effectively used in a variety of fields.  The current conjoining method uses polytetrafluoroethylene heated above the melting point and then pressed.  However, this method is very costly and energy intensive.  An inexpensive method is to use polyvinylidene fluoride which can form a film and a thin layer and glass fiber is empregnated with an inexpensive resin as an intermediate layer.  To conjoin the above structure a mechanical method (sewing) is used.  However, this creates stresses at the conjoining point and affects durability of the films. 

Clemson researchers have developed a conjoining method for a composite film characterized in that during the conjoining of the composite film comprised of polyvinylidene fluoride as the outer layer and a core material which are laminated with each other, the edge of one film is wrapped with polyvinylidene fluoride film and conjoined at a temperature of 350 degrees C or less. 



Waterproof Cloths; Pneumatic Structures; Stadium Covers



•  Better Mechanical Properties

•  Lower Processing Temperatures

•  Lower Manufacturing Costs     


Click here for a full color copy with figures


Inventors:                     Chris Cole, Robert Bennett, Brian Frederick


Patent Type:                  Patent issued #8,361,582


Protection Status:          Available for Licensing


CURF Ref No:              01-002

Patent Information:
Advanced Materials
For Information, Contact:
Andy Bluvas
Technology Commercialization Officer
Clemson University Research Foundation
Christine Cole
Robert Bennett
Brian Frederick
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