vb.net barcode scanner source code HOW TO POLISH THE EDGES OF PLASTIC in Software

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8.2.4 HOW TO POLISH THE EDGES OF PLASTIC
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Plastic that has been cut or scored usually has rough edges. You can file the edges of cut PVC and ABS using a wood or metal file. You should polish the edges of higher-density plastics like acrylics and polycarbonates by sanding, buffing, or burnishing. Try a fine-grit (200 to 300), wet dry sandpaper and use it wet. Buy an assortment of sandpapers and try several until you find the coarseness that works best with the plastic you re using. You can apply jeweler s rouge, available at many hardware stores in large blocks, by using a polishing wheel. The wheel can be attached to a grinder or drill motor.
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8.2 WORKING WITH PLASTICS
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Burnishing involves using a very low temperature flame (a match or lighter will do) to melt the plastic slightly. You can also use a propane torch kept some distance from the plastic. Be extremely careful when using a flame to burnish plastic. Don t let the plastic ignite, or you ll end up with an ugly blob that will ruin your project, not to mention filling the room with poisonous gas.
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8.2.5 HOW TO GLUE PLASTIC
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Most plastics aren t really glued together; they are melted using a solvent that is often called cement. The pieces are fused together that is, made one. Household adhesives can be used for this, of course, but you get better results when you use specially formulated cements. Herein lies a problem. The various plastics we have described rarely use the same solvent formulations, so you ve got to choose the right adhesive. That means you have to know the type of plastic used in the material you are working with (see Table 8-1). Using Table 8-2, you can select the recommended adhesives for attaching plastics. When using solvent for PVC or ABS plumbing fixtures, apply the cement in the recommended manner by spreading a thin coat on the pieces to be joined. A cotton applicator is included in the can of cement. Plastic sheet, bars, and other items require more careful cementing, especially if you want the end result to look nice. With the exception of PVC solvent, the cement for plastics is watery thin and can be applied in a variety of ways. One method is to use a small painter s brush, with a #0 or #1 tip. Joint the pieces to be fused together and paint the cement onto the joint with the brush. Capillary action will draw the cement into the joint, where it will spread out. Another method is to fill a special syringe applicator with cement. With the pieces butted together, squirt a small amount of cement into the joint line. In all cases, you must be sure that the surfaces at the joint of the two pieces are perfectly flat and that there are no voids where the cement may not make ample contact. If you are
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TABLE 8-2
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Plastic Bonding Guide CEMENT TO ITSELF, USE ABS ABS solvent Acrylic solvent White glue Model glue White glue Rubber adhesive PVC PVC solvent CEMENT TO OTHER PLASTIC, USE Rubber adhesive Epoxy Rubber adhesive Epoxy Contact cement Epoxy, contact cement PVC ABS (to ABS) CEMENT TO METAL, USE Epoxy Contact cement Contact cement CA glue* Contact cement Contact cement Contact cement
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PLASTIC TYPE ABS Acrylic Cellulosics Polystyrene Polystyrene foam Polyurethane PVC
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(*CA stands for cyanoacrylate ester, sometimes known as Super Glue, after a popular brand name.)
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PLASTIC PLATFORMS
joining pieces whose edges you cannot make flush, apply a thicker type of glue, such as contact cement or white household glue. You may find that you can achieve a better bond by first roughing up the joints to be mated. You can use coarse sandpaper or a file for this purpose. After applying the cement, wait at least 15 minutes for the plastic to fuse and the joint to harden. Disturbing the joint before it has time to set will permanently weaken it. Remember that you cannot apply cement to plastics that have been painted. If you paint the pieces before cementing them, scrape off the paint and refinish the edges so they re smooth again.
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