Thermoplastic Sheet Forming Method Cold bending. Simple circular or cylindrical Vacuum forming or blow molding in female mold shapes. The thicker the sheet, the larger the bend diameter must be to prevent high stress concentrations. Ex: consumer packages. Hot line bending.…
Design rules Designing molded reinforced plastics parts is difficult because of the large number of variables encountered in the material and the process, and the difficulty of controlling some of them. These variables include: composition of the resin, including fillers,…
Reinforced Plastics Molding The term “reinforced plastics moldings,” as used here and in the plastics industry, refers to parts produced by impregnating a reinforcing material, in the form of cloth or mat, with a liquid thermosetting or thermoplastic resin, laminating…
The plastic molding process cycle We are ready to study the actual plastic molding process cycle in the press room inasmuch as we have become familiar with not only the component parts of the mold itself but also the materials…
casting Materials. Any resin available in liquid form can be cast. Castable resins include phenolics, polyesters, epoxies, silicones and acrylics. Types of molds. The type of mold used depends on the plastic, the size and shape of the part, and…
Advantages and Disadvantages of Plastics The growth of the polymer industry in the latter half of the 20th century has been phenomenal and shows no signs of decreasing. If the advantages of synthetic polymers over competing materials such as metals and…
plastic molding term Heat-distortion temperature (°F) at fiber stress of 264 psi (ASTM D 648) is a statement of the temperature required to permit an arbitrary standard amount of deflection by a standard load, in a test in which the…
Cost of injection molding parts In three forms it is important to consider how the costs of injection molding are determined: Cost Related To The Injection Molding To assess molding prices, four basic elements must be analyzed: The volume or…
shrinkage It is important to recognize that each plastic has its own inherent characteristics. A molded piece shrinks after being formed in the mold, which is called shrinkage. Plastic shrinkage is one of the most common defects in injection molding.…
Name Abbreviation Application General Purpose Polystyrene PS Lampshade, instrument housing, toys, etc. High Impact Polystyrene HIPS House ware, electrical components, toys, etc. Acrylonitrile Butadiene Styrene ABS instrument housing,House ware, advanced toys, sports goods Acrylonitrile Styrene AS(SAN) Daily transparent containers Butadiene…
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