Fabrication pasting process

Chem. Descrip. Emulsion PVC homopolymer CAS 9002-86-2 EINECS/ELINCS 208-750-2 Uses PVC for paste processing of coated fabrics, floor coverings, structural foamed wallpaper, unsupported layers/films, chemical foams Features Produces low to med. vise, pastes with pseudoplastic flow fast expansion very good foam color... 

Uses PVC for paste processing for foam applies., coated fabrics, floor coverings, wallpaper, unsupported layers/films, dipping/casting, spray coating... 

The battery components are fabricated and processed as shown in the flowsheets of Fig. 23.10. The major starting material is highly purified lead. The lead is used for the production of alloys (for subsequent conversion to grids) and for the production of lead oxides [for subsequent conversion first to paste and ultimately to the lead dioxide positive active material (Fig. 23.10a) and the sponge lead negative active material]. 

Fine Powder Resins. Fine powder PTFE resins are extremely sensitive to shear. They must be handled gendy to avoid shear, which prevents processing. However, fine powder is suitable for the manufacture of tubing and wire insulation for which compression molding is not suitable. A paste-extmsion process may be appHed to the fabrication of tubes with diameters from fractions of a millimeter to about a meter, walls from thicknesses of 100—400 )J.m, thin rods with up to 50-mm diameters, and cable sheathing. Calendering unsintered extmded soHd rods produces thread-sealant tape and gaskets. 

Comfort. In the past, the evaluation of fabric or garment comfort has been a subjective process influenced by such variables as temperature, insulating efficiency, moisture absorption, drying speed, softness, bulk, fabric constmction, and air permeability. Human factors must also be considered. 

The cast grids are made into battery anode and cathode plates by the application of a lead oxide paste of 70 percent lead oxide (PbO) and 30 percent metallic lead. Lead ingots are tumbled in a ball mill with airproducing lead oxide and fine lead dust (referred to as leady oxide ). Leady oxide particulates are entrained in the mill exhaust air, which is treated sequentially by a cyclone separator and fabric filter. The used fabric filter bags are shipped to a RCRA-permitled commercially operated ha2ardous waste landfill located in Colorado. The leady oxide production process does not produce wastewater. 

All AB, alloys are very brittle and are pulverized to fine particles in the hydrid-ing-dehydriding process (see Sec. 7.2.1). Thus electrodes must be designed to accommodate fine powders as the active material. There are several methods of electrode fabrication Sakai et al [35] pulverize the alloy by subjecting it to several hydrogen absorption-desorption cycles, before coating the resulting particles with Ni by chemical plating. The powder is mixed with a Teflon dispersion to obtain a paste which is finally roller-pressed to a sheet and then hot-pressed to an expanded nickel mesh. The fabrication of a simple paste electrode suitable for laboratory studies is reported by Petrov et al. [37],... 

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