FR2489180A1 - PROCESS FOR CHEMICAL CLEANING DISINFECTANT, TEXTILE GOODS, HIDES AND SKINS - Google Patents

Abstract

THIS PROCESS IN WHICH THE GOODS TO BE CLEANED ARE TREATED IN AN ORGANIC SOLVENT, WITHOUT ADDING REINFORCERS, CLEANING, IN THE PRESENCE OF A DISINFECTANT, IS CHARACTERIZED BY THE FACT THAT DURING THE CLEANING PROCESS CLEANLY SAID WE SPRAY FROM 10 TO 100 OF WATER, RELATED TO THE WEIGHT OF THE GOODS TO BE CLEANED, IN THE FORM OF STEAM AND OR IN THE FORM OF A FINE MIST, IN THE STEAM SPACE ABOVE THE CLEANING BATH AND, AT THE SAME TIME, CIRCULATED L 'HOT AIR IN A CLOSED CIRCUIT THROUGH THE STEAM SPACE AND ON AN ANNEXED COOLING DEVICE, AND THAT DURING THIS CLEANING PROCESS THERE IS CONSTANTLY ABOVE THE BATH A RELATIVE HUMIDITY OF 70 TO 100. USE OF THIS PROCEDURE TO DISINFECT CLOTHING WHILE CLEANING THEM WITHOUT CRINNING OR FELTING OR SHRINKING.

Description

Process for chemical cleaning disinfectant.

  In the conventional method for the chemical cleaning of textiles, leather and skins in a solvent bath, without disinfecting agent, used heretofore, a disinfection of the mentioned goods is not obtained; corresponding researches have often shown that a dispersion of the microorganisms brought on the merchandise

to clean.

  The known methods for the chemical cleansing

  fectant, which use formaldehyde or its derivatives, operate in the presence of cleaning enhancers (see R3mpp 7. Edition, Volume 5, page 2952), which are added to

  solvent bath together with small amounts of water.

  In addition, to have a good disinfection without damaging

  the goods to be cleaned by creasing, felting or

  In order to achieve this, both the amount of water in the bath and the relative humidity in the steam space must be carefully controlled. This moisture must not exceed 90%, for example with the unique process for chemical cleaning disinfectant, which is mentioned in the list of products and disinfection processes verified and recognized

  by the Federal Hygiene Service (as at 1 June 1978).

  In the newspaper "Reiniger + Wâscher", notebook 7/80, page 29, it is said that for the cleaning time of 15 minutes, during which the relative humidity in the steam space above the bath should not exceed 90%, most of the outerwear worn today is felting, so these processes are not suitable for cleaning

industrial chemical.

  In German Patent No. 21 08 991 there is disclosed a method, which has been proven in practice in the past, that good cleaning effects can be obtained in a hot air stream without a cleaning enhancer, only with a solvent organic (eg perchlorethylene) and water in finely divided form, without having to fear

  unfavorable influence (eg felting) of the goods

  say. But from the hygienic point of view, this procedure is to bring back to the standard purification methods, because the microorganisms neither are killed in a sufficient perimeter nor are prevented from being transmitted. If, according to this process, it is desired to obtain a disinfection by adding formaldehyde, this is not sufficient because the high relative humidity initially falls in a few minutes after the addition.

  water, which follows the start of cleaning, to less than 70%

  because of the refrigerant in the system. Due to the strong air circulation in the steam space of the machine, a high relative humidity can hardly be obtained for a long time with the usual dosing devices. A condition for the effective activity of formaldehyde disinfection in chemical cleaning is, however, a high relative humidity, prolonged, from 80 to 90%. The inventors of the present invention have surprisingly discovered that high quality cleaning as well as a remarkable disinfecting effect are achieved by observing the following procedure: 1. Throughout the process of cleaning

  in a conventional cleaning machine, continuous spraying is

  relatively large quantities of water up to 100% of the weight of the goods, in the form of steam and / or a fine mist in the vapor space above

cleaning bath.

  2. Through a flow of hot air oriented, it prevents damage to the cleaning commodity necessarily occurring even during the addition of high water mentioned in 1, such as crumpling, shrinking or felting. Air circulating in the machine is heated over a heater and led through the vapor space above the cleaning bath. For the condensation of the entrained vapors from the organic solvent and the water, this air is brought to a refrigerant, in

  closed circuit, and sends it back to the heater.

  3. Through careful adjustment of the spray

  mentioned in 1, with the circulation of hot air

  born in 2, one creates in the vapor space above the cleaning bath, always the high relative atmospheric humidity,

  optimal, desired for disinfection.

  4. Cleaning is done without adding extra strength

  cleaning tool. The known relations between the

  cleaning agents and water retention can not as well

  to be observed, which represents an essential simplification.

  Quite surprisingly, cleaning effects

  remarkable are achieved despite everything.

  5. At the beginning of the cleaning process, add a

appropriate disinfectant product.

  The object of the present invention is therefore a method for chemical cleaning disinfectant, in which the merchandise to be cleaned is treated in an organic solvent, without adding a cleaning enhancer, in the presence of a disinfectant, then the liquid of the bath is removed by pumping and the cleansed merchandise is drained, optionally rinsed, and then dried in a stream of hot air, the method being characterized in that during the cleansing process itself, is sprayed continuously 10 to 100%,

  preferably 30 to 50% water, based on the weight of the product.

  sweets to be cleaned, in the form of steam and / or an end

  fog in the vapor space above the bath of net-

  At the same time, a hot air stream is circulated in a closed circuit through the vapor space and on an attached cooling device, while during the cleaning process a constant humidity of 70 is prevailing above the bath. 100%, preferably 80 to 90%. As organic solvents, chlorinated hydrocarbons are used

  lower aliphatics, such as perchlorethylene.

  For the process, are used as disinfectants,

  for example, formaldehyde and its derivatives in the form of

  or hemiformalene or chlorine, or

  mineral or organic substances containing active chlorine as the active ingredient. Depending on the conduct of the process, amounts of 0.005 to 0.5% formaldehyde, based on the weight of the commodity, are sufficient, which corresponds to about 0.0005 to 0.05% based on the organic solvent. These quantities are enough to kill test germs. As germs are tried Staphylococcus aureus SG 511, Bot. coli, ATCC 8739, Pseudomonas

  aeruginosa, Proteus vulgaris and Trichophyton mentagrophytes.

  To eliminate the formaldehyde remaining on the treated merchandise, subsequent treatment thereof with ammonia gas is performed to bind formaldehyde as hexamethylenetetramine. Subsequent treatment of the cleaned merchandise with hydrogen peroxide can also be carried out in the bath, or in the rinse bath, to convert the residual amounts of formaldehyde into formic acid. The same treatment can be carried out with a small amount of hydrogen peroxide to eliminate the residual amounts of chlorine at the end of the cleaning process, when chlorine or mineral or organic substances with active chlorine have been used as disinfectant. active. The duration of treatment is calculated according to the requirements and is between 10 and 45 minutes, preferably between 20 and 30 minutes. The disinfectant is added with or shortly after the first addition of water. During the cleaning process, a stream of hot air is passed over the solvent bath heated to 200 ° -60 ° C., preferably 30 ° -40 ° C., This air stream is introduced through a heating device into the bath. vapor space above the cleaning bath and from there, for the condensation of the organic solvent vapor and water, entrained, passes over a refrigerant and. return in closed circuit to the heater. It is important that the addition of water and the circulation of hot air brought into the refrigerant are adjusted one after the other so that in the vapor space above the cleaning bath

  always has a relative humidity of 70 to 100%, preferably

  from 80 to 90%. To avoid possible damage to the cleaned goods at the end of the cleaning process, the circulation of hot air is maintained for some time,

  for example 3 minutes, without continuing to spray the water.

  Then, the bath liquid is pumped off, the merchandise

  cleaned is drained, possibly rinsed, and dried

in a stream of hot air.

2'489180

  In the bibliography we often talk about embarrassment

  due to smell during disinfection with formaldehyde.

  As a result of the relatively small amounts of formaldehyde used in the process mentioned for the chemical cleaning disinfectant, at the end of the process, there remains only minimal amounts of formaldehyde, according to the previous observations, adhering to the cleaned goods. As already mentioned, these quantities can easily be removed at the end of the cleaning process, by vaporization, by subsequent treatment with a little gaseous ammonia (formation of hexamethylenetetramine), or by oxidation to formic acid.

  with, for example, hydrogen peroxide.

  In addition to formaldehyde, chlorine is also a

  appropriate disinfectant product. This can be very easy

  Also available in the form of commercial soda lye for bleaching (about 15% active chlorine / liter). To avoid damaging the goods to be cleaned, the maximum amounts of active chlorine are based on the weight of the goods.

must not exceed 0,3%.

  The present invention is illustrated by the example

  descriptive and not limiting thereafter.

Example

  A standard cleaning machine is provided with a

  the steam inlet in the vapor space above the cleaning bath. In the machine is a

  fan with which one can create a circulation of air.

  Thus, the air is blown on a heater in the vapor space above the cleaning bath and from there,

  refrigerant and the vapors entrained

  ethylene and water condense, and returns to the device

closed circuit heating system.

  In the drum of the machine are placed 25 kg of men's clothing, pure wool, and woolen blends with usual synthetic fibers. On the various pieces of clothing are placed bags in which are ends of rags with the germs to try. These are: Staphylococcus aureus SG 511, Bct. coli ATCC 8739, Pseudomonas aeruginosa, Proteus vulgaris and Trichophyton mentagrophytes. After inserting the garments into the machine, the drum is turned on. As soon as the pieces of clothing are impregnated with perchlorethylene, the circulation of hot air is started and steam is sprayed. At the same time as the first addition of steam, 400 ml of an aqueous solution containing 50 g

  formaldehyde (0.2% based on the weight of the goods).

  In all, for about 30 minutes, spraying

  12.5 kg of steam (50% relative to the weight of the

  chandise), so that in the steam space above the bath there is a relative humidity of 80 to 85%. grace

  to the regulation of the circulation of hot air with the con-

  of steam, we are sure that the indicated humidity is con-

  nakedly maintained. After the last addition of steam, the drum is allowed to rotate again under hot air circulation for a further 3 minutes. Then, by pumping and by

  spin, empty the cleaning bath, rinse the goods

  With 130 liters of fresh perchlorethylene, distilled for 4 minutes, it is filtered off again and dried in the hot air stream. After blowing fresh air, empty the machine and remove the ends of the rags with the

  Test germs of bags applied to clothing parts.

  The cultures carried out afterwards show that all the germs

  are dead. Parts of clothing that have been cleaned and

  fectées are clean and are neither felted nor shrunken.

Claims (3)

  1. A process for chemical disinfectant cleaning in which the merchandise to be cleaned is treated in an organic solvent, without adding cleaning enhancers, in the presence of a disinfectant, then the bath liquid is pumped off and the cleaned merchandise is drained, optionally rinsed, then dried in the hot air stream,   this process being characterized by the fact that during the process   After cleaning, 10 to 100% of water is continuously sprayed, based on the weight of the merchandise to be cleaned, in the form of steam and / or a fine mist in the vapor space above the cleaning bath. and at the same time we pass a current of hot air in a closed circuit   through the vapor space and on a cooling device   annexed, that during the cleaning process there is a constant humidity over the bath 100 %.   2. Method according to claim 1, characterized by   the fact that organic solvents   lower aliphatic chlorinated carbides.   3. Process according to claims 1 and 2, characterized   the use of formaldehyde or chlorine as disinfectants or mineral substances   or organic containing active chlorine as the active ingredient.