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740 Palnts & Coatlngs Figure 8 Water Bath Paint Arrestor in Spray Booth Spray palnt lmplngeti on a curtaln of water- cascades created by water falling over a serles of baffles. The paint and water mMum can be separated, penn/tt/ng IY)-USB of the water. Source: Cda1/8f/o~ ol Pslnthg Wastelosde Awockrted MUI Metal FMhg, U.S. EnviroMlental ProtecuOn Agency, June 1980. 4 .... : . .;:*. . .e .'j '. . . ',. .. . .'.. exhaust alr waste -1 water Figure 9 Furniture makers can both Roll Coating reduce pollution and increase productivity by switching to elec- The palnt is applied to . a roller and transferred to the object by rolling trodeposition coating techniques. contact. Roll coating can apply palnt to one side only, or both sides La-%Boy (Dayton, Tennessee) has simultaneously. raised ita production of metal sofa Source: Cakulabbns of Painffng Wasteloads Associated wfth Metd Flnrshlng. U.S. Environmental Protection bed mechanisms eight-fold since Agency. June 1980. installing an electrodeposition paint line. Increasing productivity has meant a savings in labour and maintenance costs.37 Sputtercoating Sputtercoating is a process where a thin metallic deposit is sandwiched between two organic coatings to give an object a metallic appearance (see Figure 11). The sputtercoating process most closely resembles a spray paint n- \ / R operation, however the finished product resembles an object that has been electroplated. Metals pw.lbd palnt that are applied by sputtering include chromium, silver, gold, . * w
- 1 Figure 10 The Electrocoating Process Electrocoatlng can be 90 to 99%effklent In paint usage. The high transfer effklemy Is due In part to closed-loop rinsing. Loose paint particles In the rinsewater can be recycled back to the coating tank. source: cakulations d Paintina Wastebads Associated with Metal Finishing. U.S. Environmental Protection " Agency, June 1980. rinse rinse rinse Cheln On Edge co8tlng pm tem producer thin (approx.- 500 duccw base or topcoat over irwular angstrom) mete1 film on furn/fure shapes. corner. Linear Pass reciprocating spray system Produces base or topcoat at 5-15 feetlminute. Ultraviolet Curing Station Is capable of fully curing topcoat In seconds. Paints & CoaUngs 741 brass, bronze, aluminum, copper, stainless steel and rhodium. According to Robert Rainey, operations manager at Varian's Advanced Industrial Coating Op- eration (Florence, Kentucky), sputtering is a physical phenome non that was discovered in the 1880s as a failure mode in high- voltage vacuum tubes. The metal from the cathode of the tube would "sputter" away and end up as a build-up on the glass enclosure.38 "It wasn't until the mid-19OOs that thisproblem was converted to a useful tool for the formation of thin films," says Rainey.= Until the 19706, sputtering technology application was ham- pered by the slow rate at which the metal layer could be deposited. Since then, the development of high-rate magnetron sputkring sourceshasincreasedmetaldepos- ition rates 30-fold to a level com- patible with rapid production needs.% The resulting metal layer is very thin, typically ranging from 500 to 1000 angstroms in thick- ness. Because thin coatings reduce the quantity of metal used, production & are shaved accord- ingly. In addition, sputtering con- sumes only one-third of the energy required in conventional electro- plating? The base coat, the first layer to be applied, functions to level and seal the substrate as well as Figure 77 Structure of a Spuff ercoat The sputtercoat Is composed of an organic base coat, a very thin metal /ayw and an organk fop coat which functions to protect the metal layer. Source: "Sputtercoating A Produdion Reakty." PlatlngandSurfecaFinishmg. &dl 1981 -1 top coat 0.5-1.0 MIL metal 500-1000 A" base coat 0.51 .O MIL I substrate I I
Page 1 and 2: Paints &Coatings Technological inno
Page 3 and 4: ,. and paint application. The terms
Page 5 and 6: Paint Manufacturing Two mqjor strat
Page 7 and 8: 1 . no single coating type will cap
Page 9 and 10: that actuaily reaches the target ob
Page 11 and 12: M:inuf~ictirrrrs of’ cbl(~ct t-os
Page 13: * . Paints & Coatings 739 Manual
Page 17 and 18: I I Moyer Diebel (Jordan, Ontario)
Page 19 and 20: paint sludge recycling? ‘They thi
Page 21 and 22: ' C The Synthesis of Chemicals and
Page 23 and 24: Journals Numerous excellent publica

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