Design rulesDesigning 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, catalysts and…
Reinforced Plastics MoldingThe 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…
The plastic molding process cycleWe 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 which…
castingMaterials. 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 other design…
Advantages and Disadvantages of PlasticsThe 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 ceramics…
plastic molding termHeat-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 specimen…
Cost of injection molding partsIn three forms it is important to consider how the costs of injection molding are determined:Cost Related To The Injection MoldingTo assess molding prices, four basic elements must be analyzed:The volume or expenses per cubic inch…
shrinkageIt 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. It can…
NameAbbreviationApplicationGeneral Purpose PolystyrenePSLampshade, instrument housing, toys, etc.High Impact PolystyreneHIPSHouse ware, electrical components, toys, etc.Acrylonitrile Butadiene StyreneABSinstrument housing,House ware, advanced toys, sports goodsAcrylonitrile StyreneAS(SAN)Daily transparent containersButadiene StyreneBS(BDS)Special packaging, food containers, pen, etc.Acrylonitrile Styrene acrylate copolymerASAOutdoor furniture,car outer mirror housingPolypropylenePPPacking bag,packaging, daily…
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