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PriceFitters offers directional shot peening on the internal surface of resin transfer tubing, bends and fittings. Directional shot peening produces an irregular surface which minimizes the amount of contact the resin pellet has with the tube wall. Instead of sliding along the tube wall and leaving a smear, the pellet will tumble and fall back into the air stream intact. In addition to minimizing the development of angel hair, shot peening also greatly reduces the generation of dust, fines, and fluff. When compared with other styles of textured surfaces, directional shot peening results in approximately one third of the fines generated by the next best surface finish.
One of the hazards of conveying resin pellets in dilute phase is the generation of streamers, angel hair, or snakeskins. These are formed when resin pellets, made soft from the heat produced during the conveying process, come in contact with the inside surface of the resin conveying tubing. The softened pellet tends to smear as it slides along the tube. Over time these smears combine to form streamers, angel hair, or snakeskins. The end result can be conveying line blockages resulting in system downtime and inefficient system performance. To combat this, plastics processors commonly use conveying tubing with textured internal surfaces created from treatments such as directional shot peening. PriceFitters also offers spiral grooving and porcelain lining treatments.
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