Wedge Welding
Wedge Welding uses a heated platen inserted between 2 or more thermoplastic materials to fuse or heat seal the plastics. Movement is translational. Heat sealing is caused by following the heated platen (or heated wedge) with a roller pressure means.
There exists two very popular technologies of applying pressure to create the seal. The older of the two technologies was invented by Wolfgang Neidhart (1979) of Swiss company Sarna Kunststoff Holding, Inc. and uses opposing pressure rollers to urge the two materials together. The newer technology was invented by Glenn Lippman (1989) United States company Novaseal Corporation and uses a base pressure roller method to weld the materials. The illustration shown above is the base pressure roller method. There are distinct advantages for the use of either technology, however the use of the Lippman method avoids lots of jamming inherent with the opposing pressure roller method.
During the past 20 years there have been many companies with wedge welding products, however each new product is based on either opposing pressure roller method (OPR) or base pressure roller method (BPR).
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plastics welding, geotextiles, geomembranes, heat sealing, sarna, novaseal, wedging
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