Extruder profile coated

There are many ways in which foams can be processed and used as slabs, blocks, boards, sheets, molded shapes, sprayed coatings, extruded profiles, foamed in place in existing cavities, in which the liquid material is poured and allowed to foam, and as structural foams (Chapter 6, STRUCTURAL FOAM). Conventional equipment such as extruders, injection, or compression machines is used. However specially designed machines are available to just produce foamed products. 

Another consideration is the ability of a material to provide a surface that is compatible with the requirements of the application a smooth finish for extruded profiles, molded-in colors, textured surfaces, etc. The compatibility of the major processes with in-mold coating and other insert-surfacing materials, and their compatibility with surface decoration secondary processes, could also be important. 

Uses Fungicide for plastics (PVC, PU), for vinyl film, sheeting, extruded profiles, plastisols, molded goods, organosols, fabric coatings, urethane shoe soles and foams... 

Synonyms Propenenitrile copolymer Vinyl cyanide copolymer Uses Elastomer for automotive and industrial applies., e.g., seals, gaskets, membranes, cable jackets, extruded profiles, rubber linings, hoses, bellows, sleeves, oil field parts binder, saturant for textile coatings, adhesives porous membrane for dialysis in food-pkg. adhesives Regulatory FDA 21CFR 175.105... 

Poly(vinyl chloride), PVC-U. Applications extruded profiles, sealing joints, jackets, furniture, claddings, roller shutters, fences, barriers, fittings, injection-molded articles, sheets, films, plates, bottles, coated fabrics, layers, toys, bumpers, buoys, car parts, cards, holders, sleeves, pipes, boxes, inks, lacquers, adhesives, foams. 

In transfer tapes, the PSA is coated on the release liner without additional backing. Therefore the release forces on both sides of the liner have to be precisely different and constant over storage time. The adhesives sometimes contain short-cut glass fibers to decrease the elongation during unwinding. Such tapes are used to transfer the PSA to extruded profiles or other parts to endow them with pressure-sensitive adhesion. For use in household and office, special dispensers are available. 

In the production of fine rubber sheets or coated rubber sheets, the main equipment used is a calendering machine. Though rubber extruding machines which are later developments are used for manufacturing some sheet profiles, the calendering machines are the ones used widely in the rubber industry for the manufacture of rubber and coated rubber sheets. Calenders are conveniently used for the continuous production of rubber sheets from different types of rubbers. 

Perhaps a more common sheeting die is the so-called coat hanger die, presented in detail in Chapter 3. For a given manifold angle a we must determine the manifold radius profile, R(s), such that a uniform sheet or film is extruded through the die lips. 

The usual die used is a crosshead with a 90° angle between the wire line and the extruder body axis (Chapter 17). With this setup, the entire length of the extruder projects sideways from the coating lines. To help melt flow from developing dead spots in the melt channels, 30° or 45° crossheads can be used. They provide a more streamlined interior and the extruder location is better adapted to some plant layouts. They are sometimes preferred when processing PVC because of the streamlining and better control of the melts heat profile. Most dies are subjected to very high internal pressures since the uncommon pressure in the extruder barrel of over 5,000 psi (35 MPa) is required. 

The dip BM process bears some resemblance to IBM in that it is a single-stage process performed with a preform on a core/blow pin.The difference is in the way the preform is made. The process uses an accumulator cylinder that is fed by an extruder. The cylinder has an injection ram at one end while the other is a free fit over the blow pin. The blow pin is dipped into the melt so that a neck mold on the pin seals the end of the accumulator cylinder. The injection ram is advanced to fill the neck mold then the blow pin is withdrawn at a controlled rate so that it is coated with a melt layer extruded through the annular gap between the pin and the accumulator cylinder. The thickness of the coating can be varied or profiled to an extent by varying the speed of the blow pin and the pressure on the injection ram. After trimming, the preform is BM in the same manner used for IBM. 

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