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Lifetime License Version Is Here .This invention relates generally to a method and apparatus for the molding of plastic foam articles and, more



 

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Inventory Software - Inventory Software - Amazon.com: Inventory Software. Shop with confidence on Amazon.. Ashampoo WinOptimizer 19.0.2 Crack Free Lifetime License Version Is Here .This invention relates generally to a method and apparatus for the molding of plastic foam articles and, more particularly, to such a method and apparatus in which there is a relatively wide tolerance in the predetermined dimensions of the article to be molded. The method and apparatus may be used in the formation of any kind of foam plastic article such as, for example, plates, cups, trays, packing materials, matting, underlayment and the like. There are two primary methods by which plastic foam articles are made. The first method involves the extrusion of a plastic foam in which the plastic foam is extruded as a mass and the extrusion is cut to form a desired length of the article. The second method involves the blowing of the plastic foam by a high pressure gas such as air or steam. With both of these methods, the process includes the mixing of a foamable plastic resin, a blowing agent such as a volatile organic chemical, a catalyst and other optional ingredients in a mixing chamber. The resin and blowing agent are mixed in the mixing chamber to form a plastic foam. The plastic foam is extruded to the desired length of the article and is cut into desired lengths of articles. The extruded plastic foam must have a foam density equal to the desired density of the foam article. In the second method, the plastic foam must have a density of at least one-half (1/2) of the desired density of the foam article. The plastic foam article is placed in the mold, and a number of secondary operations can be performed. These secondary operations include, for example, cutting the mold to the desired shape and providing vents and other openings in the mold to allow the high pressure gas to escape to the atmosphere. In the molding of plastic foam articles by extrusion, the flow of the extrusion must be controlled. The amount of foam in the foam mass to be extruded is determined by the viscosity of the resin. If the viscosity is too low, the resin will flow too easily and the foam will be too weak. If the viscosity is too high, the resin will not flow readily and the foam will be too weak. Thus, the viscosity of the foamable plastic resin can be adjusted by the use of additives to increase or decrease the viscosity




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