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Typical rotational molding applications Advantages of rotational molding Rotational molding offers signifi- cant advantages when compared with other molding techniques or thermoforming: • costs for molds and tooling are relatively low; • the rotomolding technique is easily adapted to short produc- tion runs, particularly when sets of multiple-cavity molds are used; • hollow, totally enclosed items as well as pieces with openings can be made; • rotational molding eliminates the need for secondary tooling; • there is little or no waste due to resin scrap; • wall thickness and piece weight can be easily controlled; • rotational molding procedures assure uniform wall thickness; • deviations can be controlled to within a maximum tolerance of ±10 percent; • pieces with intricate contours and undercuts can be easily molded; • virtually any size piece can be rotationally molded; • there is a minimum of cross- sectional deformation and warpage; • rotational molding yields pieces with excellent surface detail and finish; • rotationally molded items are virtually stress free; • identical or similar items or different sections on one piece can be molded at the same time in different colors on a single spindle; • plastic or metal inserts can often be molded as integral parts of the item; and • double wall constructions are feasible. Rotational molding permits produc- tion of a countless number of fully or partially closed items. Design versatility of rotationally molded pieces is almost unlimited. The rigidity or flexibility of an item is controlled by the properties of the resin used (see section on Resin Choice) and by the wall thickness of the molding. Some typical applications for which rotational molding is particularly suited include the following: • commercial, industrial and agricultural storage tanks ranging in size from 5 gallons to 22,000 gallons; • containers for packaging and material handling; • a variety of industrial parts, especially covers and housings, water softening tanks, tote bins; • numerous under-the-hood and in-the-cab automotive parts; • hobby horses, pool tables and many other small or large toys with complex shapes; • baby cribs, balls, dolls, and doll parts; • display window mannequins and other hollow display figures of all sizes, and; • playground equipment and sporting equipment such as golf carts, footballs, juggling pins, helmets, dumbbells, golf tee markers, canoes and kayaks. Rotomolded parts are also used in portable outhouses, battery cases, light globes, vacuum cleaner and scrubber housings and garbage containers. Furniture, game hous- ings, surf boards, traffic barricades, display cases and ducting can also be produced by rotomolding. The list above indicates just some of the possibilities. Figures 1-4 illustrate some of these applications. Design – almost endless potential With rotomolding, a plastics product designer can create a huge array of innovative products. Typical design concerns that are handled routinely by rotational molding include the following: • maintaining uniform wall thick- ness – rotational molding can provide a more consistently uniform wall thickness for a part compared to other plastic processing methods; • producing double-wall construc- tion – rotational molding can provide uniform double-wall construction on parts; • molding thicker corners – due to the process, rotomolded parts will have thicker outer corners which help strengthen the parts; and • molding inserts, reinforcing ribs, kiss-off ribbing and undercuts – these are easily included in a roto-molded part. Designers interested in acquiring more specific information can con- tact the Association of Rotational Molders, 2000 Spring Road, Oakbrook IL 60521, (630) 571-0611. Figure 4. Large storage tanks are a major market for rotomolding 3PDF Image | A Guide to Rotational Molding Equistar
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