fast track for pcbs

the market in the united states for printed circuit boards will almost double by 1987, but cost reduction will force technology changes. some examples of cost-lowering methods are explained including use of conductive polymers for electronic keyboards. the traditional method has been to plate contact areas with nickel and gold. but epoxy ..

recycling rinse water

blue chip finishing company is one of the largest job painting shops on long island, new york. it phosphates steel parts and chromates aluminum, then paints and silk screens for the electronics and other industries in the northeast. the shop has no sewer and no nearby stream for waste water. so the company purifies its own rinse water and..

possibilita di utilizzo del grasso di lana quale combustibile industriale. $left bracket$ possibility of using wool grease as an industrial fuel $right bracket$

experimental results and economic evaluations reported by the authors justify the potential use of wool grease for industrial fuel by wool scouring factories. some wool grease samples are characterized by high heating powers (about 9600 kcal/kg) and a viscosity approaching that of residual fuel oil (20-50 $degree$ e) moreover, the viscosi..

constant innovation on a massive scale

this review of latest developments in textile dyes and chemicals provides evidence of the tremendous number and scope of recent innovations by leading manufacturers. three new dyes from the dispersol range, wool dyes, dyes for poly/cottons, printing liquids, the remazol range of reactive dyes, mothproofing and scouring agents, softeners, ..

screen printing on glass makes headway with new developments

the volume of glass that is screen printed has seen much growth during the past decade. this article discusses the philosophy of svecia silkscreen maskiner ab, sweden, as regards this field, and describes equipment developed specifically for the technology. flat glass screen printing can be considered to fall into three general categories..

factors affecting the rate of photoyellowing of bleached and fluorescently whitened wool cloth

the rate of photoyellowing, when wet, of wool cloth bleached conventionally with hydrogen peroxide and then with stabilized sodium dithionite depends on the ph of the dithionite bleaching bath between ph 3. 5-7. 5, the lower the ph, the higher the lightfastness the enhanced photostability of damp fabric which has been dithionite-bleached ..

mechanical, chemical and bacterial resistance of modified polyvinylidene fluoride membranes suitable for ultrafiltration of oil emulsions

the membranes are made from modified polyvinylidene fluoride the base polymer shows very good resistance to chemical and bacterial attack and the membranes prepared from it should presumably have the same properties. in order to verify the above assumption, the membranes were stored for one year in the presence of the following agents: wa..

li** $plus$ eucryptite superionic conductors thick films

among solid electrolytes, lithium conductors have specific advantages, due to the small size of the li** $plus$ cation. this paper reports on a study to demonstrate the feasibility of $beta$ -eucryptite (lialsio//4) and spodumene (lialsi//2o//6) thick films thick films have been achieved onto $alpha$ -alumina substrates by silk-screen pri..

problem of utilizing secondary polymeric resources in the manufacture of man-made fibers

a method of using wastes, especially nontextile wastes, is to modify man-made fibers by mixing solutions of these in a common solvent during the process of preparing the spinning solution. this method of utilizing nontextile wastes for the modification of man-made fibers by spinning them from polymer mixtures may find wide application in ..

modification of acrylic fibers: an overview

from this review the following are found to produce such fiber properties as hydrophilicity, dyeability, flame retardancy, etc through various methods of modification. modification of acrylic fibers using methods is also found to help in achieving bicomponent fibers which find an increasing demand in the world market as a substitute for w..