Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
  • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
  • D06L1/02—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using organic solvents
  • D06L1/04—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using organic solvents combined with specific additives
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
  • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
  • D06L1/02—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using organic solvents
  • D06L1/08—Multi-step processes

Definitions

• the present invention relates to the cleaning of contaminated clothing.
• the first type of contamination targeted is radioactive contamination, but the invention does not mean be limited to cleaning clothes affected by this type contamination. It could be contamination by chemical pollutants.
• clothing should be understood in a broad sense, including not only linen with natural fibers or synthetics and fragile linen (blouses, coveralls, pants, jackets, leggings, work clothes, t-shirts, socks, etc.) but also equipment such as cotton or synthetic fiber overwear.
• US-A-3,954,647 describes a composition special detergent with 0.5 to 15 ounces of water per gallon of solvent (perchlorethylene): cleaning is done by soaking industrial clothes or fabrics in a single bath consisting of such a composition.
• document FR-A-2,060 119 describes a dry cleaning process for textiles affected by biological contamination, this process consisting of soaking in a single bath of disinfection with perchlorethylene, detergent, a small amount of emulsified water, and an anti-microbial agent particular.
• the object of the present invention is to design a method of cleaning contaminated clothing which is more efficient, being both effective for cleaning while eliminating the discharge of effluents into the environment.
• a cleaning process carried out according to a dry cleaning process including at least two successive stages of treatment, including one stage primary treatment by passing clothes through a first bath consisting of a first emulsion comprising a cleaning solvent with a small amount added of water and a decontaminating detergent additive, followed by secondary treatment step by passing clothes treated in a second bath consisting of a second emulsion, formed of constituents different from those of first emulsion, and comprising the same solvent of cleaning with a small amount of water, as well than an antistatic and antiseptic detergent additive and minus a stain removing agent, the water representing in each bath a percentage by volume relative to the amount of cleaning solvent which is between 0.1% and 10%.
• the emulsion of the second bath also contains a quantity of the detergent additive decontaminant used for the first bath, as well as a flavoring additive.
• the cleaning solvent used for the treatment baths is constituted by perchlorethylene.
• the clothes cleaned are dried and deodorized, the emulsion being removed to treatment of the residues it contains, in accordance with a residue treatment technique that is part of the framework of generally approved industries nuclear.
• cleaning according to the invention is carried out according to a process of dry cleaning, said process including at least two treatment steps by successive passage of clothing contaminated in two baths, each of which consists of an associated emulsion comprising the same solvent for cleaning with a small amount of water.
• low amount of water here means a percentage of water by volume relative to the amount of cleaning solvent which remains between 0.1% and 10%.
• an emulsion is a heterogeneous system with two or more liquid phases, consisting of a continuous liquid and at least one second liquid dispersed in the first in the form of fine globules.
• the cleaning solvent is preferably a solvent such as perchlorethylene, of formula C 2 Cl 4 .
• Perchlorethylene is indeed excellent as a wetting and sequestering agent, and it has very good degreasing properties.
• Contaminated clothing at a nuclear site contain a good part of the linen which is cotton and / or synthetic material. In this case, a two or even three dry cleaning processes successive baths.
• the process of two-bath dry cleaning according to the invention includes all first a primary treatment step by passing contaminated clothing in a first bath consisting of a first emulsion comprising a cleaning solvent added a small amount of water and an additive decontaminating detergent, followed by a treatment step secondary by passing treated clothing through a second bath consisting of a second emulsion, formed of constituents different from those of the first emulsion, and comprising the same cleaning solvent added with a low amount of water, as well as a detergent additive antistatic and antiseptic, and at least one agent stain remover.
• the perchlorethylene for the first bath, you can use the perchlorethylene as a cleaning solvent, and an agent decontaminating detergent such as "PRECLIN P" diluted in water, with a proportion of about 60% water.
• PRECLIN P is a product which is produced by the company SEITZ GmbH Chemische Fabrik in Kriftel (GERMANY).
• the "PRECLIN P” is a dry cleaning booster consisting by a combination of anionic and nonionogenic surfactants of high quality, this activator being particularly well suited for use with perchlorethylene.
• the 800 ml of additive decontaminant contain 500 ml of water, and, depending on the degree of soiling of the clothes to be cleaned, add up from 0 to 800 ml of water. So taking into account the water present in the decontaminating detergent additive, percentage of water by volume represents from 1% to 7.5% depending on the amount of water added (0 to 800 ml). In practice, we will try to stay within a range of 1.5 % to 8% water for the first bath. Indeed, beyond 8 % of water, the machine could saturate at its level water separator, which would cause operation. In addition, there is a risk of multiplying the amount of residue, and increase the graying of the laundry.
• the tank of the machine is emptied cleaning used, and spinning clothes by putting rotating at a sufficient speed of rotation of the drum containing the clothes to be cleaned.
• the pumping circuit concerned then admits in the tank a second emulsion comprising the same cleaning solvent, again with a weak amount of water, as well as an antistatic detergent additive and antiseptic, and at least one stain removing agent.
• the cleaning solvent is the same as that previously used for the first and second baths, that is to say here perchlorethylene.
• the flavoring additive will for example consist of a marketed product under the name "DUFTNOTE L” which is a solution fragrance produced by SEITZ GmbH Chemische Fabrik supra.
• DUFTNOTE L a solution fragrance produced by SEITZ GmbH Chemische Fabrik supra.
• a special brightener such as "BLANKOL CF"
• the cleaned clothes are dried and deodorized, the emulsion being evacuated for treatment of residues it contains. It is a part of the water added with soaps, and on the other hand with solvent containing grease from stains and soiling and "oils" mainly from the peeling of the wearer's skin.
• solvent containing grease from stains and soiling and "oils” mainly from the peeling of the wearer's skin.
• Such treatment of residues is generally part of the value chains approved in the nuclear industry.
• a dry cleaning machine such as the P 540 or P 564 model manufactured by the company B ⁇ WE PASSAT makes-und Wàschereitechnik GmbH in Augsburg (GERMANY).
• Such machines already include a unit of cleaning, drying unit, and distillation unit, combined into a single, very compact package. he should then be combined with a metering pump to withdraw the desired quantities of affected emulsions (one, two or three different emulsions as the case may be) in the associated tanks, this dosing pump being controlled by the machine controller.

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Cited By (4)

Citations (7)

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• 1999
  • 1999-04-26 FR FR9905238A patent/FR2792659B1/fr not_active Expired - Fee Related
• 2000
  • 2000-04-20 EP EP00401113A patent/EP1048777A1/de not_active Withdrawn

Patent Citations (7)

Non-Patent Citations (4)

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