vb.net barcode scanner source code TYPES OF PLASTICS in Software

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8.1 TYPES OF PLASTICS
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Polypropylene. Like polyethylene, polypropylene is harder and more resistant to heat. Polystyrene. Polystyrene is a mainstay of the toy industry. This plastic is hard, clear (though it can be colored with dyes), and cheap. Although often labeled high-impact plastic, polystyrene is brittle and can be damaged by low heat and sunlight. Available in rods, sheets, and foamboard, polystyrene is moderately hard to cut and drill without cracking and breaking. Polyurethane. These days, polyurethane is most often used as insulation material, but it s also available in rod and sheet form. The plastic is durable, flexible, and relatively easy to cut and drill. PVC. Short for polyvinyl chloride, PVC is an extremely versatile plastic best known as the material used in freshwater plumbing and in outdoor plastic patio furniture. Usually processed with white pigment, PVC is actually clear and softens in relatively low heat. PVC is extremely easy to cut and drill and almost impervious to breakage. PVC is supplied in film, sheet, rod, tubing, even nut-and-bolt form in addition to being shaped into plumbing fixtures and pipes. Silicone. Silicone is a large family of plastics in its own right. Because of their elasticity, silicone plastics are most often used in molding compounds. Silicone is slippery and comes in resin form for pouring.
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Table 8-1 lists the different types of plastics used for different household applications.
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TABLE 8-1
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Plastics in Everyday Household Articles TYPE OF PLASTIC Polyester, PVC Polyethylene, polypropylene Polyethylene, polypropylene Polyurethane foam, PVC foam Laminated epoxies, phenolics Polyurethane, silicone, PVC Silicone, PVC Polyester, fiberglass Epoxies, polyester, PVC Cellulosics Polyester Polyethylene, polypropylene Cellulosics (continued)
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HOUSEHOLD ARTICLE Bottles, containers Clear Translucent or opaque Buckets, washtubs Foam cushions Electrical circuit boards Fillers Caulking compounds Grouts Patching compounds Putties Films Art film Audio tape Food wrap Photographs
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PLASTIC PLATFORMS
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TABLE 8-1
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Plastics in Everyday Household Articles (Continued ) TYPE OF PLASTIC Polystyrene Polyethylene Styrofoam (polystyrene foam) PVC Polystyrene, polyurethane Silicones PVC, polyethylene, ABS ABS PVC Polyethylene, polypropylene Polystyrene, ABS Polyethylene, PVC
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HOUSEHOLD ARTICLE Glasses (drinking) Clear, hard Flexible Insulated cups Hoses, garden Insulation foam Lubricants Plumbing pipes Fresh water Gray water Siding and paneling Toys Flexible Rigid Tubing (clear or translucent)
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8.2 Working with Plastics
The actions of cutting, drilling, painting, choosing, etc. plastics can be overwhelming if you don t have the basic information. Different plastics have different characteristics that will affect how they are handled and formed and whether or not they are appropriate for an application. In the following, common plastics used in robots are discussed along with information regarding how to work with them.
8.2.1 HOW TO CUT PLASTIC
Soft plastics may be cut with a sharp utility knife. When cutting, place a sheet of cardboard or artboard on the table. This helps keep the knife from cutting into the table, which could ruin the tabletop and dull the knife. Use a carpenter s square or metal rule when you need to cut a straight line. Prolong the blade s life by using the rule against the knife holder, not the blade. Most sheet plastic comes with a protective peel-off plastic on both sides. Keep it on when cutting not only will it protect the surface from scratches and dings but it can also be marked with a pencil or pen when you are planning your cuts. Harder plastics can be cut in a variety of ways. When cutting sheet plastic less than 1 8-in thick, use a utility knife and metal carpenter s square to score a cutting line. If necessary, use clamps to hold down the square. Carefully repeat the scoring two or three times to deepen the cut. Place a 1 2- or 1-in
8.2 WORKING WITH PLASTICS
dowel under the plastic so the score line is on the top of the dowel. With your fingers or the palms of your hands, carefully push down on both sides of the score line. If the sheet is wide, use a piece of 1-by-2 or 2-by-4 lumber to exert even pressure. Breakage and cracking is most likely to occur on the edges, so press on the edges first, then work your way toward the center. Don t force the break. If you can t get the plastic to break off cleanly, deepen the score line with the utility knife. Thicker sheet plastic, as well as extruded tubes, pipes, and bars, must be cut with a saw. If you have a table saw, outfit it with a plywoodpaneling blade. Among other applications, this blade can be used to cut plastics. You cut through plastic just as you do with wood, but the feed rate (the speed at which the material is sawed in two) must be slower. Forcing the plastic or using a dull blade heats the plastic, causing it to deform and melt. A band saw is ideal for cutting plastics less than 1 2-in thick, especially if you need to cut corners. When working with a power saw, use fences or pieces of wood held in place by C-clamps to ensure a straight cut. You can use a handsaw to cut smaller pieces of plastic. A hacksaw with a medium- or fine-tooth blade (24 or 32 teeth per inch) is a good choice. You can also use a coping saw (with a fine-tooth blade) or a razor saw. These are good choices when cutting angles and corners as well as when doing detail work. A motorized scroll (or saber) saw can be used to cut plastic, but you must take care to ensure a straight cut. If possible, use a piece of plywood held in place by C-clamps as a guide fence. Routers can be used to cut and score plastic, but unless you are an experienced router user you should not attempt this method.
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