ABS resin is acrylonitrile-butadiene-styrene copolymer. ABS plastic raw material is light yellow granular or beaded opaque resin, which is a bulk general-purpose resin. ABS is an engineering plastic after being modified (adding additives or alloys) to improve its performance. ABS alloy has a large output, a variety of types and a wide range of applications, and is main modified plastic.
Tag: engineering plastic
Elastic support plastic part of a bumper rack tray is shown in Figure 1, which is composed of two parts of tubular features: a tube structure with inclined holes and a tube structure with a spiral pattern on outer wall. Centerline of inclined hole forms a certain angle with centerline of bell mouth. Length of plastic part is 156 mm, width is 36 mm, and thickness is 30 mm. Average wall thickness is 1.8 mm. Plastic part is made of engineering plastic ABS with a shrinkage rate of 0.5 %~0.65%.
Polycarbonate is a thermoplastic resin containing -[ORO-CO]-links in main chain of molecule. According to different ester groups in molecular structure, it can be divided into aliphatic, cycloaliphatic, and aliphatic-aromatic types. Among them, aromatic polycarbonates are of practical value, and bisphenol A polycarbonate is important, molecular weight is usually 30,000-100,000.
Length of plastic part is 248mm, width is 203mm, wall thickness is 2mm, and material is ABS. ABS is a thermoplastic engineering plastic with a wide range of uses. It has excellent comprehensive physical and mechanical properties, good low-temperature impact resistance, stable size, good molding performance, and small shrinkage. Plastic parts A, B, and C have undercuts, which are difficult to remove from mold. A complex core-pulling mechanism needs to be designed. Wall thickness of undercut at B is 1.1mm, which is relatively thin. There are many and long ribs on the surface, and molded plastic parts are easy to lack materials. Therefore, injection process requires a relatively high injection pressure and a long dwell time. Quality of outer surface of plastic part is high. Since bottom maximum contour line has a slanted line and a stepped turning line, it is necessary to control quality of flash at parting part and the overall deformation tolerance of molded plastic part. There are many and deep ribs on inner and outer surfaces of plastic parts, which makes it difficult to exhaust during molding. Therefore, exhaust of insert should be designed at molding ribs, and position of push rod should be set as close to ribs as possible.
Polyphenylene sulfide, full name of polyphenylene sulfide, English name polyphenylene Sulfide (PPS for short), is a thermoplastic engineering plastic with a phenyl sulfide group on main chain of molecule. Polyphenylene sulfide has excellent heat resistance, and long-term use temperature is 200℃; it has good chemical resistance, and has excellent chemical properties similar to polytetrafluoroethylene; it also has special rigidity and good blendability with various fillers and other polymer materials. At present, it is the lowest price among high temperature engineering plastics and can be molded by general thermoplastic processing methods.
Gud Mould 