Engineering plastics is a kind of plastics used as engineering structural materials. Polysulfone (PSU), polyimide (PI), polyphenylene sulfide (PPS), polyether sulfone (PES), polyaryl ester (PAR), polyamide imide (PAI), polyphenyl ester, polytetrafluoroethylene (PTFE), polyether ketone, ion exchange resin, heat resistant epoxy resin 5. Functional plastics (special plastics) have special functions such as radiation resistance, super conductivity, magnetic conductivity and light sensitivity. Fluoroplastics, organosilicon plastics 6, crystalline plastics with orderly molecular arrangement and shape keeping. The orientation of PE, PP, PA7 and amorphous plastic Ryton PPS glass fiber reinforcement will affect the strength, thermal expansion and modulus shrinkage. In the process of mold filling, the glass fiber is more easily arranged along the flow direction, and the mechanical strength of the engineering plastic mixture in the flow direction can be up to 60% higher than that in the transverse direction. The standard lining has 48 hardness 52Rc, and the alloy has 60 hardness 63Rc. In addition, the cylinder can be chrome plated. Most screws are made from 4140 steel, then flame hardened and chrome plated. They can also be carburized and nitrided and sprayed metal layers on hard surfaces.

If the production is to be stopped for a long time, high-density polyethylene should be used for melting cleaning. Chromium plating and nickel plating of chemical storage cylinders can help reduce the corrosion of thermoplastics. Considerable wear usually occurs in screwdrivers with formed glass and mineral filled thermoplastic, and wear occurs in front of more screws in some return valves. Although engineering plastics are expensive, they often have some unique and excellent properties. We also suggest that you contact the adhesive manufacturer and ask them to recommend some heating cylinders of the adhesive injection molding machine that can effectively bond engineering plastics. The inner diameter of the cylinders is nitrided or other metal gaskets are added. Nitriding cylinders are made of special steel with high content and chromium aluminum and molybdenum. First, the steel is completely hardened and decarburized with all traces removed from the surface. If this step is not performed, the permeating layer will be very fragile and stripped simultaneously. Heated cylinders from 930 ° F to 1200 degrees Fahrenheit (499 ° C to 649 ° C) in the atmosphere are caused by ammonia in the hardened layer, about 0.02 inch (0.5 mm) thick.

The surface requires additional machining, and the hardness depth of Z may be greatly reduced. For example, engineering plastics have higher heat resistance, impact resistance, fatigue resistance, wear resistance, acid and alkali resistance than ordinary plastics, and can maintain excellent stability at higher and lower temperatures, or have the performance of some metals. Special engineering plastics refer to plastics that are resistant to high temperature, corrosion or radiation and are used under special conditions, such as LCP, PEI, PA46, PES, PEEK, PPA, etc. For example, it can be used in military, aerospace and other special fields. Another is called plastic alloy, such as PC/PET, PC/PBT, PPS/PS, PBT/ABS. In short, it is a kind of new material with high performance and specialization obtained by physical blending or chemical grafting.