Radiant Heat Makes Two-Piece Plastic Bottle Stopper Possible Problem: It is often difficult to accurately calculate the wattage requirements of applications employing radiant energy. Many times the wattage can be best determined through actual testing of the material. In one such case, a Watlow representative was helping a customer design a radiant oven. The customer was producing a three piece, plastic thermos bottle stopper that could be opened to form a pouring spout. Because of the dissimilar plastics involved, the customer was having difficulty getting a tight fit after assembly. With experimentation, the customer found that in heating the parts up, the resulting thermal expansion allowed a press fit which remained tight after cool-down. Solution: Working with his local representative

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