Surface Pressure-Indicating Sensor Film for Proper Sealing and Alignment in Injection Molding

Sensor Products, Inc. (Madison, NJ) offers Pressurex®, a thin flexible plastic film that instantly captures and permanently records pressure distribution and magnitude between any two mating or contacting surfaces.

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Sensor Products, Inc. (Madison, NJ) offers Pressurex®, a thin flexible plastic film that instantly captures and permanently records pressure distribution and magnitude between any two mating or contacting surfaces. Physically similar in appearance to ordinary paper, Pressurex®, which is four or 8 mils thick, conforms to curvaceous surfaces and is available in sheets or rolls that can be cut to size. After being clamped up and placed around the parting line of a mold, Pressurex® reveals whether the pressure is evenly distributed on the parting line. “With molds becoming more complex and being exposed to high pressures, it is a superior tool to bluing agents which moldmakers traditionally use,” says John Bozzelli, owner of Injection Molding Solutions, who uses Pressurex® to demonstrate good or bad parting line mating, and open or closed vents in his consulting and training services.” Bozzelli was named as one of the top 25 plastics processors by a leading trade publication. Pressurex® reveals pressure from 2 - 43,200 PSI (0.14 - 3,000 kg/cm2) and is available in eight different pressure ranges, with medium and high pressure being the most commonly used for injection molding applications. When placed between two contacting surfaces, the film instantaneously and permanently changes color directly proportional to the actual pressure applied. Precise pressure magnitude is easily determined by comparing the resultant color intensity to a color correlation chart (conceptually similar to interpreting Litmus paper). No training or instrumentation is required. “In injection molding, Pressurex® confirms that parting lines are mating properly to prevent flash, and that the vents are open allowing for proper filling of the mold cavity,” says Bozzelli. “When utilized to check a new or used mold, Pressurex® is a great troubleshooting tool for flash, burns and other parting line issues; it can save molders and moldmakers thousands of dollars by documenting defects.” Bozzelli says. Pressurex® has applications in Injection Molding, Injection-Blow, Injection-Compression, Gas Assist, Water Assist or any molding where mating metal surfaces are an issue. While the temperature parameters of Pressurex® indicate an operating temperature of 41° F to 95 F (5°C to 35°C), which is suitable for testing metal molds, it has been used at temperatures exceeding 300° for brief periods. Pressurex® also determines tactile surface pressure distribution and magnitude in clamping, bolted joints, tooling, composites, lamination presses, nips of rollers, gaskets, heat sealing and scores of other industrial uses.