Coating flocking

Uses Cement admixture elastomeric textile thread adhesives (cold-sealable pkg., selfsealing envelopes, leather/tile adhesives, pressure-sensitive) binder for tufted carpet anchor coatings, flock attachment, nonwoven fabrics carpet foam backings dampproofing formulations latex dipping compds. (gloves, contraceptives, balloons) molded latex foam natural rubber castings rubberized hair prods. in food-pkg. adhesives and pressure-sensitive adhesives... 

Extrusion coating Flame-spray coating Flocking Flow coating Fluidized-bed coating Friction calendaring... 

Paper cups and tubes Cigarette making Textile Nonwovens Fiberfill Carpeting Tie coats Flocking Furniture General purpose Laminations Film overlay, high pressure... 

The preparation of flocked fabric using acryflc adhesives is detailed in Reference 198. In flocking, cut fibers are bonded to an adhesive-coated fabric to achieve both a decorative and a functional effect. Acrylics can be tailored to provide the unique balance between softness and durability required for this... 

Other Reinforcement Ma.teria.Is. Other materials that have been used in tire compounds for reinforcement are chopped wire (brass-coated), cotton and nylon flock, chopped nylon strands, polyethylene, zinc oxide, and chopped Kevlar. Most of these materials have very limited apphcation and some are obsolete. Others are used more extensively in soHd mbber industrial tires than in pneumatics. 

Vinyls with low plasticizer contents also can be welded, but normally pre-heated electrodes and electrodes equipped to stabilize temperature are necessary. Similar vinyl materials can be welded, or rigid and flexible. Problems may be experienced with printed, lacquered, or metallized surfaces, just as with the flexible films. Flock-coated items can be welded, but not (of course) flock face to flock face. 

Coatings can be prepared by hot flocking, in which the heated part is dipped into a fluidized bed of ETFE powder and then is removed to cool. ETFE coatings can also be applied by other powder coating methods (e.g., electrostatically) or by spraying of water- or solvent-based suspensions followed by drying and baking [27],... 

High-solids emulsions with rapid water-release properties. Cure at low temperatures. Recommended for fabric finishing and coating adhesive for flocking and laminating low-crock binder in pigment printing. 

When clarity is required PVC, PS, PET, or cellulose acetate may be used. The last of these tends to cost more even though the moulding cycle is approximately 25% faster this does not compensate for the higher material cost (+30%). Impact modified styrene or styrene is more widely used for coffret-type inserts which are invariably coloured or flock coated. Styrene offers a higher yield than PVC (note densities) and a faster forming time. PET is often the preferred material for surgical or medical device systems. 

Hot flocking. Powder coating is one of the best ways to coat a large impeller or a mixing blade with a layer of thick fluoropolymer. Usually, the process starts with a cold electrostatic powder coating step... 

Figure 8.16 shows the thermal history of a 0.25 inch (6.25 mm) thick steel panel being coated with PFA. The panel has a thermocouple attached so the temperature can be monitored even while it is in the oven. The first tooth shows the temperature after the panel has been primed and powder-coated with about 2 milli-inches (50 microns) of PFA. The melt point of PFA is about 305°C-310°C and even a 0.25 inch (6.25 mm) steel panel cools quickly. One must be ready to powder-coat immediately after the panel is pulled out of the oven. About 7.9-15.7 milli-inches (0.2-0.4 mm) of additional powder was applied on top of the first coat. The part was put back into the oven and rebaked. It can then be flocked again and again. The final bake time is usually extended to allow the coating to completely flow out, usually at a lower temperature, to minimize thermal degradation. 

Table 3.4 summarizes the consumption of thermosetting binders used in various regions. The epoxy-polyester systems predominate over polyester-trisglycidyl iso-cyanurate and epoxy systems. The consumption of thermoplastic coating powders, particularly those used in the fluidized-bed and flocking processes, is substantially lower than that of thermosetting powders (Table 3.5). Their production does not show a comparably significant growth rate.

PE hot flocking, and hot fluidized bed 280-400 in some cases <1 paraffinic hydrocarbons without primer (hot-melt adhesive) poor adhesion, soft, high viscosity, complicated shapes are difficult to coat, poor weather resistance... 

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