What is the standard cleaning process?
Cleaning techniques and methods for clean clothing and accessories have a large impact on the performance of the clothing system. Standard operating procedures should be developed to control critical activities. Each end user may have its own specific control requirements, such as pre-treatment to remove stains, organics (oils) and other visible contaminants (including human contamination); Some low level; work up volatile residues.
The cleaning procedure is as follows:
1) Put the work clothes into a clean washing machine. Control the amount you put in by weight or number of pieces (different fabrics and styles may have different unit weights, so you should know the unit weight). In order to achieve the best cleaning effect, the amount of the washing machine generally does not exceed 80% of its rated capacity, except for the case of small capacity, special cleaning, or special equipment.
2) The general cleaning process includes: one or several washes, followed by a specified number of rinses. The length of washing and rinsing depends on the type of work clothes, the degree of soiling and the characteristics of the washing machine. To avoid shrinkage (excessive wrinkling and seam puckering), the wash temperature should be maintained at 32°C to 60°C (90°F to 140°F). NOTE: Rinse water temperatures for food industry workwear may be higher due to local regulations.
3) Washing water should be demineralized water (if necessary) and filtered through at least 2.0 μm membrane. Purified water for rinsing can be softened municipal water (filtered to at least 0.2 μm), deionized water, reverse osmosis water, or both. To limit the growth of microorganisms, a UV sterilization device should be installed in the water system. If deionized water is used, its resistivity should be between 15 MΩ and 18 MΩ. Water quality control reflects the severity of the owner's requirements.
4) The detergent should be a non-ionic surfactant, the amount of which depends on the product type and the washing machine capacity.
5) The product is taken out of the clean room end of the washing machine and put into a tumble dryer or tunnel drying room.
6) Use a special dryer for clean work clothes for drying. All air entering the dryer must be filtered through a HEPA filter. The environment in which work clothes are put into and taken out of the dryer should be a clean room environment.
7) In a tumble dryer or tunnel drying chamber, the product is dried at a moderate temperature (generally no more than 60°C [ie 140°F]) and then slowly cooled to avoid sudden shocks to the fabric. Actual temperatures and drying and cooling times depend on product type and equipment characteristics.
8) Be careful not to overload the dryer, as overloading will cause the garments to remain damp and not as clean as expected after drying. Control drying capacity by weight or volume.
9) The environment in which the product is taken out of the dryer should be a clean room environment, and the identification mark should be exposed and easily visible when packaged. If necessary, the user and the cleaner should negotiate special packaging requirements.