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5/21/2007

Print-through protection

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Kaizen Technologies; Sogel Inc.

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Kaizen Technologies (Montreal, Quebec, Canada) and Sogel Inc. (Longueuil, Quebec, Canada) have jointly developed a product called PrintShield that reportedly solves print-through and surface profiling problems encountered in closed molding processes like resin transfer molding (RTM) and vacuum-assisted resin transfer molding (VARTM). Print-through typically is caused by the interaction among the gelcoat, the reinforcement and the resin used in the manufacturing of composite parts. PrintShield is a protective layer that is applied over the gelcoat before the reinforcement is placed. It reportedly does not require special equipment and can be applied with a standard gelcoater or with a brush. PrintShield, say the manufacturers, is a low-shrink, non-brittle material with an overlap time of more than two weeks, allowing for its use in very large structures without adhesion problems. The material comes in four grades: Marine Vinylester for the good osmotic resistance; Marine Polyester for general-purpose marine parts; Standard Polyester for transportation or industrial parts; Tooling Polyester for Class A finish molds (without orange peel).

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