Reinforced plastics spray

Corrosion Resistant Fiber-Reinforced Plastic (FRP). Fiber glass reinforcement bonded with furfuryl alcohol thermosetting resias provides plastics with unique properties. Excellent resistance to corrosion and heat distortion coupled with low flame spread and low smoke emission are characteristics that make them valuable as laminating resins with fiber glass (75,76). Another valuable property of furan FRP is its strength at elevated temperature. Hand-layup, spray-up, and filament-win ding techniques are employed to produce an array of corrosion-resistant equipment, pipes, tanks, vats, ducts, scmbbers, stacks, and reaction vessels for industrial appHcations throughout the world. 

Spray-up Popular system with reinforced plastic production. An air spray gun includes a roller cutter that chops usually glass fiber rovings to a controlled short length before being blown in a random pattern (manually or automatically) onto a surface of the mold simultaneously the gun sprays catalyzed TS polyester plastic. The chopped fibers are plastic coated as they exit the gun s nozzle. The resulting, rather fluffy, RP mass is consolidated with serrated rollers to squeeze out air and reduce or eliminate voids. A closed mold... 

The resin matrix can be either thermosetting or thermoplastic. Thermosetting resins such as epoxy, polyimide, polyester, and phenolic are used in applications where physical properties are important. Polyester and epoxy composites make up the bulk of the thermoset composite market. Of these two, polyesters dominate by far. Reinforced with glass fiber, these are known as fiberglass-reinforced plastics (FRPs). FRPs are molded by layup and spray-up methods or by compression molding either a preform or sheet molding compound (SMC). 

Sheet is thermoformed into a product by one of the forming process. To reinforce or rigidize it, one side that is usually the back surface of the formed sheet receives a spray-up of reinforced plastic (Chapter 15). 

Shaddock, A. K. (1971) Chem Eng, NY 78 (August 9) 116. Designing for reinforced plastics. Timperley, D. A. (1984) Inst Chem Eng Sym Ser. No. 84, 31. Surface finish and spray cleaning of stainless steel. 

Corporation (Golden, CO). The reactor, 1.22m wide by 2.44 m, consisted of a fiberglass-reinforced plastic I-beam frame. A transparent fluoropolymer film, treated to accept adhesives, formed the front and back windows of the reactor. The film windows were attached to the reactor frame with foam tape coated on both sides with an acrylic adhesive. The catalyst, titanium dioxide (Degussa P25), was coated onto a structured, perforated polypropylene tubular packing commonly used in oil-water separators. The Ti02 was suspended in water as a slurry and sprayed onto the tubular supports with a new paint sprayer until the supports were opaque. Fluid modeling of airflow flnough the reactor showed that a 5.1 cm PVC manifold, located at the inlet and outlet of flie reactor, would provide an even flow distribution. Small (0.6 cm) holes, drilled into flie manifold at one inch intervals, provided the even flow distribution required for efficient contact of the contaminated air with the catalyst. 

Other polyester products include flag poles, doors, waste bins, ski rack enclosures, ski poles, fish hatchery basins, water slides and storage vessels. Many reinforced plastic products are protected by an outer gel coat layer which can be built in during composite construction most easily in hand and spray lay-up processing. 

An alternative to rubber linings which suit corrosive environments are glass flake reinforced plastics. They combine impact, erosion and abrasion resistance and can be applied on site using a spray or brush. They are compounds of glass flakes with various corrosion resistant thermosetting resins combined in different ratios. The excellent adhesion enables bonding with steel at temperatures as high as 170 "C. 

Run n. (1) In experimental or test work, performance of the experiment or test at one set of experimental factors. (2) Resin flow down the vertical or sloping surface of a sprayed-up or laid-up reinforced-plastic fabrication before it can be cured (usually unwanted). (3) Narrow downward movement of a paint or varnish film may be caused by the collection of excess quantities of paint at irregularities in the surface, e.g., cracks, holds, etc., the excess material continuing to flow after the surrounding surface has set. Sometimes called tear. (4)... 

Vacuum molding n. This type of molding is used to mold fiberglass-reinforced plastics. The method allows molding without high temperatures and pressures. In this technique, layers of reinforced media are applied to the mold by hand. Resin is either sprayed or brushed on after each layer is positioned. The flexible sheet (usually cellophane or polyvinyl acetate) is placed over the lay up. Joints and seals are sealed and a vacuum causes the b to collapse over the face of the product not contacting the mold. The resultant pressure tends to eliminate voids and forces out any excess resin or entrapped air. Madox DM (1998) Handbook of physical vapor deposition (PVD) processing. Noyes Data Corporation, New York. 

Reinforced Plastics, Guide to Hand lay-up and Spray-up, Photocopying and Fabricating Owens-Corning Fibreglass Corporation, Toledo, Ohio, USA. 

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