AATCC 158 pdf free download
AATCC 158 pdf free download.Dimensional Changes on Drycleaning in Perchloroethylene: Machine Method.
2. Principle
2.1 Conditioned fabrics or garments arc marked and measured, then subjected to a drycleaning procedure, followed by an appropriate finishing procedure. They are afterwards conditioned and measured. The dimensional change is expressed as a percentage of the original dimensions.
3. Terminology
3.1 dimensional change, 11.—a generic term for variation in length or width of a garment or fabric specimen subjected to specified conditions.
3.2 drycleaning, n. the cleaning of fabrics with organic solvents such as petroleum solvent, perchloroethylene or fluorocarbon.
NOTE: The process also includes adding detergent and moisture to the solvent, up to 75% RI-I, and hot tumble drying to 71°C (160°F).
4. Safety Precautions
NOTE: These safety precautions are for information purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to usc safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must he consulted and followed.
4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
4.2 All chemicals should be handled with care.
4.3 Perchloroethylene is toxic by inhalation, by repeated contact with the skin and by ingestion; it should be used only in a well vented atmosphere. Toxicology studies with laboratory animals have shown evidence of cancer in rats and mice exposed to perchioroethylene vapors at 100-400 ppm concentrations for prolonged times. Fabric saturated with this solvent should be dried in an adequately ventilated hood. Use chemical goggles or face shield, impervious gloves and an impervious apron when handling perch loroethylene.
4.4 An eyewash/safety shower should be located nearby and an organic vapor respirator should be readily available for emergency use.
4.5 The drycleaning apparatus should be ventilated to the outside atmosphere in accordance with the manufacturer’s instructions.
4.6 Exposure to chemicals used in this procedure must be controlled at or below levels set by governmental authorities (e.g., Occupational Safety and Health Administration’s [OSHAI perniissib Ic exposure limits [PEL] as found in 29 CFR 1910.1000 of January 1, 1989). In addition, the American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values (TLVs) comprised of time weighted averages (TLV-TWA), short term exposure limits (TLV-STEL) and ceiling limits (TLV-C) are recommended as a general guide for air contaminant exposure which should be met (see 13.5).
5. Reagents
5.1 Perchloroethylene (commercial), CCI2 = CCI,, drycleaning grade.
5.2 Sorbitan mono-oleate (a typical chemical is Span 80).
6. Apparatus and Materials
6.1 Drycleaning machine. This shall consist of a commercial rotating cage type, totally enclosed machine for use with perchloroethylene. The diameter of the rotating cage shall be not less than 600 mm and not more than 1080 mm. Its depth shall be not less than 300 mm. It shall be fitted with three or four lifters. The speed shall be such as to give a gfactor (see 13.2) between 0.5 and 0.8 for cleaning and between 35 and 120 for extraction. The machine shall be equipped with a thermometer for the measurement of the solvent temperature. The machine shall have suitable facilities so that the emulsion can be introduced gradually into the solvent between the inner and outer cages below the level of the solvent. The machine may be of the single- unit washer/dryer type or a separate dryer may be used. Both types of dryers shall be equipped with temperature control of either the incoming or the outgoing air during the drying cycle. (Information on solvent recovery is given in 13.3.)AATCC 158 pdf download.
