Titlebook: SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc.; Michael L. Berins Book 1991 Springer Science+Business Med

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Rotational Molding,xially in a heating chamber. To obtain this mold rotation in two planes perpendicular to each other, the spindle is turned on a primary axis, while the molds are rotated on a secondary axis (Fig. 14–1)..Rotational molding (also popularly known as rotomolding) is best suited for large, hollow product

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Calendering,hem and passing them through nips of a series of cooperating rolls, into a sheet of specified thickness and width. This web may be polished or embossed, as required, and may be of either a rigid or a flexible character, with the “hand” controlled by the formulation and the process.

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Vinyl Dispersions,astisol may range from a pourable liquid to a paste, depending on the formulation. When heated to about 150 to 170°C (302–338°F), the dispersion turns into a homogeneous hot melt. When the hot melt is cooled to around room temperature (25°C, 77°F), it becomes a tough vinyl product..Most vinyl applic

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Cellular Plastics,lastic or thermoset, can be made into a cellular or foamed form with the resulting products having densities ranging from 60 pounds per cubic foot (pcf) all the way down to 0.1 pcf..Basically, cellular plastics can have either of two structural configurations: (a) the closed-cell type, in which each

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Rotational Molding,s, modular bathrooms, telephone booths, boat hulls, garbage cans, light globes, ice buckets, appliance housings, and toys (Fig. 14–2). The technique is applicable to most thermoplastics but is most widely used with polyethylene..Rotational molding offers a number of advantages:

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