Dry cleaning means washing clothes without water. It only uses solvents to remove oil stains. Because there is almost no water in the solvent, it is called dry cleaning.

2, the basic steps of dry cleaning are:

The first step is pretreatment, which is to remove stains. It uses artificial additives to pretreat seriously polluted dirt and stains insoluble in dry cleaning solvents (such as juice, nail polish, paint, ink, etc.). ).

The second step is the main washing. Put the pretreated clothes into a dry cleaning machine, wash them thoroughly with dry cleaning solvent, and spin them dry.

The third step, post-treatment, the main purpose is to remove the residual dry cleaning solvent in clothes and irons and shape them.

There are three main types of dry cleaning solutions. They are:

A, chlorinated hydrocarbon synthesis solvent, the most commonly used is tetrachloroethylene (PEKCRO), which has good safety and strong degreasing and decontamination ability, but it has a strong corrosive effect on metals, and its hydrolysis main substances are toxic, which is harmful to soil, water quality and human body. In addition, it has a strong dissolving effect on plastic, nylon and other products, so this kind of jewelry (such as buttons, etc. ) Be sure to remove it when washing.

B. Chlorofluoride solvent, the typical representative of which is trichlorotrifluoroethane (CFC- 1 13), etc. Non-toxic, non-flammable, non-corrosive to rubber and many chemical fibers, and cleaner than tetrachloroethylene. However, such solvents have been banned because they destroy the atmospheric ozone layer.

C. Hydrocarbon solvent, namely petroleum solvent, has good washing effect. Clothes washed with this kind of solvent have no peculiar smell common in tetrachloroethylene washing, and have no pollution to human body and environment. In the past, it was eliminated because of poor security. Now with the development of science and technology, security has been solved, so it is more and more favored by dry cleaners.

4. Polypropylene clothing (including rain-proof silk, etc. ), rubber products (including elastic bands), artificial leather, paint ornaments (such as lacquer flowers), metal ornaments and velvet products bonded with glue are not suitable for dry cleaning.