Cast nylon

Other, more recently developed, uses include microwave oven parts, transparent pipelines, chemical plant pumps and coffee machine hot water dispensers. One exceptional use has been to produce, by an extrusion moulding process, very large rollers for textile finishing for use where cast nylons cannot meet the specification. Also of growing interest are medical equipment applications that may be repeatedly steam-sterilised at 134°C, filtration membranes and cartridges for ink-jet printers. 

Liquid PA or cast nylon is a block copolymer of caprolactam and a prepolymer that can be processed in the liquid state, which simplifies tooling and processing machines. 

Cast nylon is used for prototypes and small production runs processed by casting, roto-moulding and reaction injection moulding (RIM), possibly with structural reinforcements (SRIM) such as glass mat or fabric. 

In case these sample trays become unavailable, a dimensional diagram is given in Fig. 1.1b of a simplified version. The original trays were made from a glass fibre filled resin. It is suggested that suitable materials would be Nylon 66 rod, 25 mm diameter for the handle cast Nylon 6 rod, 100 mm diameter for the underside cast Nylon 6 available as 10 x 500 x 500 mm sheet, sufficient for four trays. These are available from RS Components Ltd, at the website http //rswww.com... 

Compare the appearance of the solvent-cast nylon film with that of the polystyrene. 

Monomer casting is effective for the fabrication of shaped products in practically all sizes and thicknesses. It also provides economic advantages in low or high volume manufacture. Cast parts can be either produced to size or they can be cast and then machined to strict tolerances as required in accordance with end-use needs. Monomers of the lactam family are used to make cast nylon. They will polymerize under various conditions. 

The nylon casting process is relatively more economical and is a more practical technique for the production of large and thick parts than comparable extrusion and injection molding processes. In addition, the crystallinity and molecular weight of cast nylon are higher than those of extruded or molded nylon. Consequently, cast nylon has a much higher modulus and heat deflection temperature, improved solvent resistance, and better hygroscopic characteristics and dimensional stabflity. 

Important advantages of the process are the low heats and low pressures involved. Although the polymerization process is exothermic, the relatively low heat of polymerization of caprolactam, coupled with its low melting point, makes the process easy to control and simplifies the heat transfer problem generally associated with the production of massive parts. Moldings of cast nylon-6 up to 1 tn are claimed to have been produced by these techniques. 

Dartek F-101. A clear, cast nylon film designed for thermoforming applica-... 

In situ polymerization of nylon permits massive castings. Cast nylons are readily polymerized directly from the monomer material in the mold at atmospheric pressure. The method finds applications where the size of the part required or the need for low tooling cost precludes injection molding. Cast nylon displays excellent... 

Adell Ashley Adell Albis ComAlloy Cast Nylons Cast NylCast Nylons Cast Nylons Cast Nylons Adell Albis ALM Ashley... 

Elastalon, Urethane-filled cast nylon rods, sheets, and tubes. Cast Nylons Ltd. Elastichem, PVC elastomers, Colorite Plastics Co. 

Hydcast, Cast nylon rod, slab, and tube, Hyde, A. L., Co. 

Nycast XHA, Heat-stabilized cast nylon. Cast Nylons Ltd. 

Nylons Type 6 Cast Nylons Molded, Extruded 6/6 Nylon Glass fiber reinforced Chlorinated polyvinyl chloride Alkyds Molded Rope (general purpose) 0.015 0.018—0.009 0.0189—0.0208 0.019... 

Melamines Molded Glass fiber filled Melamines Molded Unfilled Nylons Molded, Extruded Type 6 Cast Nylons Molded, Extruded Type 6 General purpose Self extinguishing Self extinguishing Self extinguishing Self extinguishing... 

Spit [152, 153] showed detailed spherulitic structures in solvent cast nylon 6 and nylon 6,6 films cast from formic acid onto water and stained with 2% PTA. Spherulitic textures with white and dark bands or lines were observed. 

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