Document wKRJYBMojMj0zrRN2r9OKNQMJ

942 CHAPTER 44 1952 Guide - Table 1. Temperatures and Humidities Applicable to . Industrial Air Conditioning--(Continued) Process | Temp. F R.H. % PRECISION. MACHINING (Continued) Precision parts--honing........................................................ 75 68-75 72 76 78 75-80 45-50 45-50 42-50 45 50 . 35-45 For general manufacturing and assembly areas no attempt is made to control conditions during hot weather. - An ample supply of outside air and air motion are relied upon to provide personal comfort. Low relative humidity is 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: Stockroom: * 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 45-50 50 Lithography requires constant 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 fiat, with 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 slow ink drying. Temperature is not critical, but extremes should be avoided 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' forall exoept job shops. Exhaust system with dust collectors incorporated is required for type and plate cleaning areas. Check use of gasoline and other solvents. Summer--winter central systems are recommended for all except job shops where-unitary equipment with heating coils and humidifiers may be used. 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 offioe areas. Process Temp. F REFRIGERATION EQUIPMENT 75 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 . 75-90 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 install a solvent recovery system. Industrial Air Conditioning 943 Table 1. Temperatures and Humidities Applicable to. Industrial Air Conditioning--(Continued) Process Temp. F TEXTILES Cotton: Opening............................................................. Picking......................................................................... Carding, Winter............:......... ,,............................. Carding, Summer......... .................................................. Carding, Summer...................................................... ! -.or . Carding, Summer....................................... ..................or Drawing..................................................................... Roving............................................................. :.......... Ring Spinning Conventional......... ............................................... : Long Draft................................ ............................. Frame Spinning................................ ............ ......... Spooling & Warping............ ..................................... 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 & Winding. WrVeeaavvimngg,., Finishing Silk: Preparatory., Weaving............. Dressing............. Spinning.. Throwing.. Rayon: Spinning........................ Throwing................................. Weaving Regenerated......................... Acetate.................................. . Spun rayon.......................... Carding, roving, drawing....... ' Knitting Viscose or cuprammonium. Acetate..... ....... ............ Laboratory (ASTM).............. Rayon synthetic fiber processing:. Viscose Preparatory............................. Weaving.................................. Celanese........................1............. 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 1 75 .75 75-80 75-80 80 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 80-90 ' 80 80 80 .80 75-80 80-90 80-85 80-85 70 , 55-60 55-60 .55 . 90 , . 80 . 70 - 60 60 . 70 r .. 55 55-60 65 70-85. 65-70 50-65 60 60 80 60 65-70 50-60 60 60 60-65 60-60 65 65-70 65-70 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 80 60 80 60 80 70 80 70-75 80 50-60 80 50-60 Cotton: Relative humidity maintained,in ring spinning depends on staple, twist and whether leather aprons are used for conveying long draft stock. Aprons readily absorb moisture causing cotton to stick when relative humidity is above 55 percent. ", With conventional 3 or 4 roll spinning, relative humidity may be as high as 70 percent dependent upon draft, twist and staple. . Relative humidity carried in cotton weaving depends upon construction of the cloth. When automatic machines are to be tended and the warps are heavily sized, it may be as high as 90'percent. Woden: In woolen spinning, the relative humidity maintained for mules is generally 55 percent with conditions over frame spinning at 55 to 60 percent. Both types of spinning depend on the of stock spun, also the regain in the roving. "