Expandable foam

The constmction of vinyl-coated fabrics varies according to its appHcation. A vinyl-coated fabric used for automobile seat covers is shown in Figure 3 a woven fabric is the substrate. The material is durable but stiff and heavy. Incorporating an expanded foam stmcture into the coating layer reduces the weight (Fig. 4), and replacing the woven substrate fabric with a soft knit fabric improves fiexibihty. 

Azodicarbonamide Blowing agent in the manufacture of expanded foam plastics for wallcoverings, floor coverings, insulation and packaging materials... 

A rigid foam sheet product is made by heating at least one surface of a crosslinked PE foam sheet material to a temp, sufficient to cause a slight surface post-expansion of the sheet material and contacting the heated, post expanded foam surface with a cold metal element to form a product with the desired, accurate thickness or having a desired three-dimensional design on the sheet material. USA... 

Expanded Expanded foam sheet, Polypropylene, standard Silicon,... 

Units for producing slabs of expanded (foamed) polyurethane are also equipped with a conveyer belt with side walls. The initial mixture is continuously fed onto the line, then foamed, and finally passed into a solidification chamber, where it is heated under IR lamps. Commercial lines for making slabs of elastic foamed polyurethane are up to 125 m long. The items produced can be up to 2 m wide and 1.5 m high. 

Figure 3.2 Cross section of an expanded foam rubber heat- and sound-insulation tube of a poly(aryloxyphosphazene). Reproduced by permission of Ethyl Corporation.

Flame-retardant polystyrene is used primarily in expanded foam for building insulation. Rubber-modified styrenic polymers are flame retarded for use in a number of applications, such as enclosures for electronics and business equipment. By far the largest volume flame-retardant HIPS application is television enclosures (Figure 29.1) these are made primarily from flame-retardant HIPS [3]. Flame-retardant HIPS has an attractive balance of mechanical properties, processability and cost. Flame-retardant styrenic blends such as HIPS-PPO and PC-ABS also find utility in a number of electrical applications such as printers, computers and monitors. These blends have received increasing attention recently because of their ability to be flame retarded with nonhalogen flame retardants (see Section 7). 

Note POLYURETHANE FOAM, the amber material sold commercially as A/B foam, or surfboard foam,will not vaporize and should never be used.Use only white POLYSTYRENE EXPANDED FOAM. 

The gelation rate of the expanding foam is decreased, thereby preventing thermal pressure cracks and chaning of the foam in large applications. 

Ability to lay down an expanding foam without causing its collapse or density change. 

A number of manufactured products comprising thermoplastics (polyethylene, polyvinylchloride, polyamides,. ..) or elastomers (natural rubber, nitrile rubber, ethylene propylene rubber, silicones) are processed by cross-linking to improve their performances in insulated electric wires and cables, multilayered films for cooking pouches, shape memory tubes, pressure resistant water pipes, expandable foams, automotive parts exposed to motor... 

Belts must be of heavy duty construction to prevent deflection under the pressure of the expanding foam. A deflection of. 030 inch (0.76 mm.) in each belt results in a. 060 inch (1.52 mm) difference in panel thickness across the width of the panel. 

National Starch www.eco- foam.com/loosefill.asD ECOFOA M Modified maize/tapioca starch Expanded foams, injection molded toys, extruded sheet and blown film applications... 

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