Coating spread

Of the various processing techniques used, injection mol ding and extmsion involve Htfle or no exposure of hot product to the surrounding air, hence they give rise to no significant emission of plasticizer to the atmosphere. This is not the case in the production of sheet and film by calendering or spread coating. 

Thickening agents. When pseudoplasticity is necessary in NBR adhesives (spread coating operations, sprayed cements), carboxylic vinyl polymers can be added. 

In this study the environmental impacts are calculated for the use of 1 m2 cushion vinyl floor covering, with a lifetime of 15 years (in LCA terms called the functional unit). Figure 1 shows the process flowchart for the production, use and waste disposal of a cushion vinyl floor covering. Cushioned flooring is produced by spread coating. The glass fibre is used as a substrate. Several layers, each with its... 

PVC spread-coating pastes are normally manufactured in high-speed planetary mixers that can be evacuated. It is best to add the plasticizer first, stir in the pigments or pigment pastes and only then to add the solid components in portions. In pigmenting plasticized PVC compounds, on the other hand, it is necessary to mix... 

P.R.188 is also employed in paper mass coloration, paper surface coloration, paper pulp, and paper spread-coating formulations, as well as in wallpaper and wax crayons. 

Figure 1. Weight loss from spread coating (Werner-Mathis oven coating thickness 0.25 mm dwell time 2 min)...

For plastisol/organosol technology, high-molecular-weight PVC powder is slurried in liquid plasticizer, and poured, dip- or spread-coated onto metal, fabric, or paper to produce dishwasher racks, upholstery, and wallpaper, respectively. 

This procedure identifies plastisols that are spread-coated on different substrates such as paper, aluminum foil, wood, and plastic sheet or film. Application is by doctor blade, direct roll, or reverse roll operations (Chapter 10). As an example plastisols are roll coated on adhesively primed metal for house sidings, conveyor belts, cloth fabrics, wood panels, and so on. 

Recent developments in calcium/zinc stabiliser systems used in plasticised PVC are discussed. Here, the term plasticised PVC (PVC-P) represents calendered film, calendered flooring, spread-coated flooring and the various plastisol product areas. Emphasis is placed on the European Market as it is here that the need for new... 

The use of the vinyl polymer in fluid form offers distinct advantages to the manufacturer of vinyl products. The most important obvious advantage is the relatively lower cost of liquid processing equipment and accessories as compared to those required for processing of solid or powder thermoplastics. For example, a spread coating line, for example, knife or roll coater, even with appropriate unwind and takeup accessories, is less expensive than a banbury-mixer-mill calender configuration. 

Figure 6. Application of fluid vinyl resins in a spread coating line.

Production of PVC and other plastics MCCPs and LCCPs Spray droplets volatilization waste waters 0.3-1.5% from extrusion, calendering, injection molding, coating 0.1-0.2% from open calendering of plastics and plastisol spread coating 0.05%/year to air and waste water... 

Spread-coating compound. [Data from Mark RFD. Technical data sheet Crompton. 

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