Document Ex8D4rx4gNENnvV9gEqL88M2g

1126 CHAPTER 46 1957 Guide Table 1. Temperatures and Humidities Applicable to Industrial Air Conditioning--(Continued) Process j Temp. F | R.H. % PRECISION MACHINING (Continued) 75 68-75 72 76 78 75-80 45-50 45-50 42-50 45 50 35-45 For product improvement and increased personnel efficiency some manufacturing areas are being pro vided with summer air conditioning. Where air conditioning lb not provided, an ample supply of outdoor air and air motion are relied upon to provide acceptable worktng conditions. Low relative humidity ia usually maintained to prevent corrosion. Temperature control within a narrow range is more important than temperature maintained. Dust control is required wherever polishing operations occur. Air distribution is important to maintain constant conditions throughout the area. Process PRINTING Temp. F R.H. % Pressroom: Stock room: 5 to 8% above pressroom b same as pressroom 75-80 75-80 75-80 73-80 70-80 70-80 73-80 46-48 45-50 50-55 * 5-8%above pressroom b 46-50 50 lithography requires oonstant humidity control of entire pressroom with paper conditioned 5 to 8 percent higher relative humidity at start. All printing requires conditioned paper otherwise it will not lie flat, witn 40 to 45 percent R.H. low limit to eliminate static electricity; and 60 percent R.H. high limit to prevent swelling of the rolls and alow ink drying. Temperature is not critical, but extremes should be avoiaea due to softening of the rolls at high temperature and improper ink distribution at low temperatures. Hoods must be provided for gas dryers, with solvent recovery recommended for all except job shops. Exhaust system with dust collectors incorporated is required for type and plats cleaning areas. Check use of gasoline and other solvents. Normal air cleaning is adequate. Air distribution must prevent drafts on paper in storage or process. Gas flame dryers impose unusual loads. Air from press and storage rooms should not be recirculated through office areas. Temp. F REFRIGERATION EQUIPMENT 76 70 to 76 75 65 to 82 R.H. % 40 30 to 45 30 to 50 47 . Process Temp. F R.H. % RUBBER DIPPED GOODS 90 80 75-00 60-75 73.4 25-30 25-30 40-50 50 __________________ - Solvents used in manufacturing processes are usually explosive and toxic, requiring positive ventilation. Volume manufacturers usually a solvent recovery system. Process and Product Air Conditioning 1127 Table 1. Temperatures and Humidities Applicable to Industrial Air . Conditioning--(Continued) Process TEXTILES Temp. F R.H. % Cotton: Opening.. Picking............ Carding, Winter i^aruiug, auminer............................................................................................ Carding, Summer........................................................or Carding, Summer........................................................or Drawing.. .............................. Roving...................................... Ring Spinning Conventional......................... Long Draft......................... Frame Spinning....................... Spooling A Warping................. Weaving.................................... Cloth Room.............................. Combing................................... Linen: Carding............................ Spinning................................... Weaving.................................... Woolens: Pickers.......................... Carding..................................... Spinning................................... Dressing.................................... Weaving Light goods............................ Overcoating (32 os.).............. Drawing.................................... Worsteds: Carding....................... Combing................................. . Gilling........................................ Top Storage............................... Drawing..................................... Cap Spinning........................... . Spooling A Winding................. Weaving.................................... . Finishing................................... Silk: Preparatory.......................... Weaving.................................... . Dressing..................................... Spinning................................... . Throwing.................................. . Rayon: Spinning........................... Throwing........................ ......... Weaving Regenerated............................ Acetate................................... Spun rayon............................. Picking....................................... Carding, roving, drawing.......... Knitting Viscose QT mpnunmnnlnm. . Acetate.'.................................. Laboratory (ASTM)................. Rayon synthetic fiber processing: Viscose Preparatory............................ Weaving.................................. Celanese .................................... Preparatory............................ Weaving. . Nylon Preparatory............................ Weaving.................................. 70-75 75 75-80 83 85 87 80 80 80-85 80-85 80-85 78-80 78-80 75 75 75-80 75-80 60 80-85 80-85 80-85 75-80 80-85 80-85 75 80-85 80-85 80-85 70-85 80-85 80-85 75 80 75 80 80 80 80 80 80-00 80 80 80 80 75-80 80-00 80-85 80-85 70 80 80 80 80 80 80 55-60 55-60 55 00 80 70 60 60 70 55 55-60 65 70-85 65-70 50-65 60 60 80 60 65-70 50-60 60 60 60-65 50-60 65 65-70 85-70 75-80 65 50-55 65-70 55-70 60 60-65 60-70 60-65 65-70 60 50-60 55-60 50-65 55-60 80 50-60 50-60 65 60 65 60 60 70 70-75 50-60 50-60 Cotton: Relative humidity maintained in ring spinning depends on staple, twist and whether leather aprons are used for conveying long draftstock. Aprons readily absorb moisture causing cotton to stick when relative humidity is above 55 percent. With conventional 3 or 4 roll spuming, relative humidity may be as high as 70 percent dependent upon "reft, twist and staple. Relative humidity carried in ootton weaving depends upon construction of the eloth. When automatic reachmee are to be tended and the warps are heavily sised, it may be as high as 90 percent. In woolen spinning, the. relative humidity .maintained for mules is generally 55 peroent, witK conditions over frame spinning at 55 to 60 percent. Both types of spinning depend on the rf*** of stock Pun, also the regain in the roving.