Picnic-ware

The important features of rigidity and transparency make the material competitive with polystyrene, cellulose acetate and poly(methyl methacrylate) for a number of applications. In general the copolymer is cheaper than poly(methyl methacrylate) and cellulose acetate, tougher than poly(methyl methacrylate) and polystyrene and superior in chemical and most physical properties to polystyrene and cellulose acetate. It does not have such a high transparency or such food weathering properties as poly(methyl methacrylate). As a result of these considerations the styrene-acrylonitrile copolymers have found applications for dials, knobs and covers for domestic appliances, electrical equipment and car equipment, for picnic ware and housewares, and a number of other industrial and domestic applications with requirements somewhat more stringent than can be met by polystyrene. 

Figure 28 Right richly-mottled Bakelite wool holder, 1940s. Front toast rack and Banda-lasta picnic ware and salt and pepper set in urea-thiourea-formaldehyde, 1927-32. The powderedform of thiourea made it possible to create softer mottled effects than with granular urea-formaldehyde...

PS /V Polystyrene (PS), often foamed disposable picnic ware, fast food clamshells, egg cartons, meat trays 1.05 ca. 100... 

The next largest molded product market for PP is packaging, especially closures and containers. Child-resistant, tamperproof, linerless features are important design factors as also inherent chemical resistance, stress-crack resistance, and high productivity at low cost. Housewares utilize random copolymers for refrigerator and shelf-storage containers and lids. Medium-impact copolymers are used for hot/cold thermos containers, lunch boxes, coolers, and picnic ware. 

Acrylonitrile, styrene Free-radical-initiated chain polymerization Components of domestic appliances, electrical equipment and car equipment, picnic ware, housewares... 

Crazing caused in earfy plastic picnic ware by the cream layer on milk led to the replacement of polystyrene ly the more eaqrensive SAN copolymer. Margarine containers are made fiom ABS (rubber-toughened SAN) for similar reasons. Recent concerns about solvent crazing have centred mmnfy upon the effects of fuel and oils on plastic components in cars. 

Applications Chemical drums, jerricans, carboys, toys, picnic ware, household and kitchenware, cable insulation, carrier bags, food wrapping material. 

Applications of injection molding of thermoplastics include practically every molded thermoplastic item— picnic ware (including eating utensils) fashion buttons refrigerator food containers grocery-store containers for butter, yogurt, and the like towel racks and fan and power-tool housings are some examples. Since the thermoplastic materials are... 

Commodity Appiications Kitchen and picnic ware, cups, tooth brush handles, cosmetic packaging, household utensils. 

Styrene-acrylonitrQe (SAN) copolymer is a brittle material but has improved surface hardness and chemical resistance when compared with polystyrene and has excellent resistance to weathering. It is available in granules from transparent pale straw colour through a full range to opaque colours. SAN is processable by injection or blow moulding and extrusion. Applications include table, picnic and kitchen ware where resistance to fruit juices and natural oils is important, cosmetic and pharmaceutical packaging for similar reasons, refrigerator parts, and radio controls and scales. 

---