THE INDIA RUBBER WORLD 



797 



Rubber Hose in Painting, Asphalt and Cement Coating. 



iigs i)y 



I u.TS. fc.r apply 



of compressed air, rubber hose is now used very exten- 

 sively. Painting with mechanical appliances for concrete and ma- 

 sonry surfaces, structural ironwork, bridges, ships, mesh-wire fac- 

 tory fences, tanks, castings, machinery, car trucks, underbodies 

 and other large equipment has been a recognized method for 

 several years, and has generally superseded the hand iiainter. 



With the modern paint gun the work is done when wanted in 

 a remarkably short time, with little c-r uo interrupt-on cf business, 

 without depend- 

 ing on a large 

 lal)or force and 

 at the lowest 

 possible cost con- 

 sistent witli a 

 thorough, dur- 

 able job. The 

 early difficulties, 

 such as loss of 

 paint, excessive 

 scattering and 

 spattering over 

 surfaces not to 

 be painted, lack 

 of control in the 

 wind, and vola- 

 tilization of the 

 paint oils while 

 passing through 

 the air have been 

 overcome by the 

 perfection of in- 

 genious patent 

 no/;zles and the 

 provision of spe- 

 cial full body oil 

 paints peculiarly 

 adapted to the 

 purpose. 



With an ample 

 length of rubljcr 

 hose and a 

 twelve-foot ex- 

 tension arm, 

 scaffolding and 

 swing - staging 

 can be dispensed 

 with very largely. 

 Out of doors one 

 man and a helper 



can cover from 1,000 to 2,000 square feet per hour, multiplying 

 the labor value from eight to ten times. As compared with 

 the hand method a saving of approximately $1.50 per gallon can 

 be effected. Indoor painting jobs can be done at the rate of 1,000 

 to 1,600 square feet per hour. The right paint applied to factory 

 interiors by this method will conserve much light, thereby saving 

 electric current, eyesight and daylight working hours. It gives 

 a smooth, fine, hard, dirt-resisting coating having neither the 

 chalky whiteness that absorbs light and quickly becomes dirty, 

 nor the glossy surface that causes a blinding glare or dazzling 

 flicker. It diffuses light as it reflects it and fills the interior with 

 a soft, even radiance. Moreover, a film of paint can be built up in 

 one operation that is the equivalent of two or three hand lirush 

 coats. 



The method is c(|ually efficient on any surface, from smooth 



wood finish to the roughest masonry, and can be used to special 

 advantage on cast stucco, rock-faced walls, rough lumber, brick- 

 work with recesses, broken-down masonry joints, surfaces under 

 eaves, lattice work, structural steel, and all places inaccessible to 

 a brush. This is because the perpendicular application of the 

 paint .s certain to penetrate voids better than brushing across the 

 surface. 



.^n efficient brushing action by the powerful compressed air 

 jet is of advantage for cleaning dirty surfaces and in reaching 

 corners and crevices for which the hand painter's implements, 



the wire brush, 

 tty knife and 

 ith, are inadc- 



.\ pneumatic 

 inting outfit 

 consists essential- 

 ly of a paint 

 tank with the 

 necessary valves, 

 gages, etc., a 

 motor-driven air- 

 compressor, a 

 nozzle or brush 

 and the rubber 

 connecting hose 

 fur paint and air. 

 The paint, ready 

 for application, is 

 poured into the 

 tank. An agi- 

 tator, operated 

 hy band or com- 

 pressed air, is 

 available for use 

 when necessary. 

 .\ compressed air 

 line leads to the 

 tank with a 

 branch line for 

 air and paint 

 from the tank to 

 the nozzle. 

 Sometimes the 

 foriner is ordin- 

 ary f/ii-inch heavy- 

 air hose, while 

 the latter is ]4- 

 ;n'.-h flexible met- 

 al-lined oil suc- 

 tion hose, having 

 coiled coppered-steel wire embedded in the wall to give it 

 strength and rigidity. The lining, friction and cover of this hose 

 are specially compounded to resist the action of the oil and paint, 

 as it is important that the rubber shall not flake or peel off and 

 get into the delicate orifices of the spraying nozzle. The adhe- 

 sion of the rubber frietion must be especially strong in order to 

 retain the wire firmly in place. Special paint hose, three, four and 

 five-ply, is also made with internal diameters of H. V2. H- 1 a"d 

 1'4 inches, having a ply of seamless braided material over the 

 plies of duck, with a rubber cover over this, so that the structure 

 of the hose is held intact, preventing the duck from unwrapping 

 and coming apart after long contact with oil and paint. 



Many of the leading rubber companies are employing these 

 pneumatic painters for their buildings, factory interiors, etc, and 

 several of them use a special equipment with a compact nozzle 



