 Charles H. Trillich Packworld USA President Visit Website |
Charles H. Trillich is the President of Packworld USA and for the past 25 years has dedicated himself to developing “state of the art”, impulse heat-sealing solutions for the Medical/Pharmaceutical/Healthcare industry. Under his leadership, Packworld has become the leader in resistance controlled impulse heat-sealing solutions and specializes in engineering precision controlled, validatable heat sealing machinery used throughout the industry. Packworld’s entire line of validatable pouch sealing machines come equipped with the advanced TOSS Technology, eliminating the inherent errors and lag in response time found in machines controlled with thermocouples. The TOSS controls and components are used to create precision systems that produce perfect seals - every time.
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Heat Sealing Q&A
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Asked April 15th, 2009
The Nylon film that is being used in this application is likely a coextruded material with a sealant layer on one side that is probably polyethylene (PE). The sealant layer on the Nylon is essential because the sealing temperature of both the Tyvek and the PE sealant layer are about 120 °C, whereas the sealing temperature of Nylon is 220 °C. Because the sealing temperature of the sealant layer is close to that of the Tyvek, the bond can be accomplished without overheating the Tyvek.
The ideal sealing temperatures of these materials vary somewhat depending upon their actual composition. It is always good to request recommended sealing parameters from the film supplier.
The seal strength target seems very high (2.5 lb). A target close to 1 lb for bonding these materials would be more conventional.
High-quality sealing is best accomplished with the ability to control sealing time, sealing temperature, cooling time, and, of course, pressure. When using a rotary sealer one needs to be able to control the temperature and the speed and ideally incorporate a cooling section before the work piece is released. In addition, when sealing Tyvek to a Nylon coextrusion, it is best to apply the heat from only the Nylon side. The rotary band sealer temperature should be high enough to drive the heat through the Nylon and yet not exceed the ideal sealing temperature of Tyvek.
