Reinforced rotational molding

Important are behaviors associated and interrelated with plastic materials (thermoplastics, thermosets, elastomers, reinforced plastics, etc.) and fabricating processes (extrusion, injection molding, blow molding, forming, foaming, rotational molding, etc.). They are presented so that the technical or non-technical reader can readily understand the interrelationships. 

Focusing collectors are usually cast acrylic Fresnel lenses, or mirrors of aluminized polyester film in frames of aluminum. These reflectors are either enclosed in a bubble of poly(vinyl fluoride) film, or under polycarbonate glazing, which may be covered with a fluorocarbon film to reduce the reflectivity. The absorbers for active systems are copper or aluminum since the temperatures are too high (325—370°C) for plastics. The frames, however, can be molded ABS, high density polyethylene or polyurethane, either solid or structural foam. Polybutylene or chlorinated PVC can be used for piping hot water, and tanks can be made of either reinforced polyester or blow- or rotational-molded, high density polyethylene (12—15). 

ETFE resins in the powder and bead form are rotationally molded into varied structures, such as pump bodies, tanks, and fittings and linings, mostly for the chemical process industries. Inserts can be incorporated to provide attachment points or reinforcement.41 Adhesion to steel, copper, and aluminum can be up to 3 kN/m (5.7 pli) peel force.44... 

In rotational molding and casting techniques, the processor usually adds his own reinforcement. For thermoforming, glass-RTP laminates are sold commercially. Structural foam molding of glass-RTPs and reinforcing molded urethane foams appeared as later developments in the field of RTFs. 

POs are processed using virtually every known thermoplastic conversion method. In some applications, such as film, pipe, or rotational molding, POs are the dominant materials in others, such as the injection or compression molding of highly reinforced composites, they are only starting to show their value. In summary, there are currently five major application sectors that consume the most POs ... 

Uses Compatibilizer in blends and alloys polymeric coupling agent in reinforced or recycled PE or PP, adhesives, sealants extrusion coating resin cable/wire Jacketing pipe/profile extrusions film (sacks, food wrap, earner bags) inj. mold goods (toys, elec, fittings, bushes, seals, components) rotationally molded tanks, boats textile adhesives hot melts... 

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