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You are here: EPA Home » DfE » Case Study: Water-Based Cleaning System for Suede and Leather
As part of a cooperative effort between the Environmental Protection Agency (EPA) and the professional garment and textile care industry, the EPA Design for the Environment (DfE) Program recognizes water-based cleaning systems (wetcleaning) as one example of an environmentally-preferable technology that can effectively clean suede and leather garments.
Currently, most of the Nation’s 34,000 commercial drycleaners use perchloroethylene (PCE or perc) as a solvent to clean garments. Since 1992, in response to growing health and environmental concerns about perc, EPA has been working in a voluntary partnership with the drycleaning industry to reduce exposures to perc. EPA’s DfE Garment and Textile Care Partnership (GTCP) encourages professional clothes cleaners to explore environmentally-preferable technologies capable of cleaning garments labelled “dryclean only.” Numerous companies in the garment and textile care industry have begun using wetcleaning to clean woven and knit fabrics. This process has also been applied in the industry’s leather and suede segment, and one company, Kirk’s Suede-Life, Inc. (KSL), has developed a process to effectively clean leather products using machine wetcleaning.
The C.K. Kirkpatrick Specialty Company began cleaning leather goods in 1935 and grew from businesses located in New York, Chicago, and Los Angeles. It had acquired an international clientele by the early 1960s.
In the late 1960s, the rival Suede-Life Company developed a new process to clean leather using continuous-solvent filtration and heated drying. The two companies merged in 1970 to form Kirk’s Suede-Life, Inc.
In the 1980s, KSL began to research alternatives to traditional methods of suede and leather cleaning. KSL’s research stemmed from the company’s own environmental stewardship and concerns relating to the use of perc. After 4 years of testing, KSL marketed its water-based “Clean & Green” process in 1993. That same year, perc drycleaners were required to upgrade to expensive closed-loop systems, making a switch to KSL especially attractive. The Clean & Green process is now used by all 100 KSL licensees located on six continents. In addition, KSL’s share of the U.S. leather cleaning market amounts to more than 70 percent.
In the near future, KSL will begin research on the use of liquid carbon dioxide as a leather cleaning solvent.
KSL’s Partnership with Retailers
In 1994, Kirk’s Suede-Life, Inc. (KSL) began an innovative care label program. The labels advise purchasers of new leather garments to ensure that they are cleaned by a professional KSL leather cleaner. The program originated at J.C. Penney Company, and has expanded throughout the retailing industry. In 1996, nearly 10 percent of all leather garments sold in the U.S. carried the label. This represents more than five million garments.
How Wetcleaning Works
Wetcleaning is a new process that uses detergents and water to clean garments. It requires technologically-advanced machines, specialized detergents and additives, and trained personnel. Unlike conventional clothes washing machines, state-of-the-art commercial wetcleaning machines use sophisticated controls to tailor prespotting, washing, and post-spotting cycles to a specific fabric. The machines are so specialized that they can be programmed for various functions, including agitation, water and drying temperature, and water and detergent volume. A number of cleaners can clean up to 100 percent of all garments (that used to be drycleaned) using these automated, state-of-the-art wetcleaning techniques and well-trained personnel.
In the case of wetcleaning leather and suede, and using the KSL example, a cleaner places clothes in a washer with specially formulated cleaning agents. While still wet, the cleaned garments are hung to dry overnight, then briefly tumble-dried at very low heat. Steam and air from finishing and pressing completes the work cycle. Cleaners use KSL cleaning agents, a KSL or UniMac wetcleaning machine, a tumble dryer with a stainless steel reversing basket, regulated temperature control, and finishing equipment.
KSL uses four biodegradable Clean & Green products in conjunction with its cleaning process. Prewash is added to reduce dye transfer and to protect lining materials from swelling, fraying, and wrinkling. Sulpho-tex 2000 removes oil-based stains. Cleaning Compound cleans remaining soils while restoring the leather’s oils to original tanning levels. Final Rinse provides water repellency, stain resistance, and sizing to restore garments to their original feel. The amount of each cleaning agent added is precisely metered by the washer’s microprocessor. KSL employs its own prespotters, but the need for them is greatly lessened with the use of KSL cleaning agents.
The KSL system can be used with either a small or large wetcleaning machine. To properly process work volume, KSL recommends using both small and large machines. For loads less than 25 pounds, a standard commercial washer is used. The company recommends the 35-lb UniMac UW35P3AU1. Since the washer must meet specific requirements, operators intending to use a different machine are advised to consult with KSL beforehand. For 35- to 85-lb loads, the 100-lb KSL/Midwest Clean & Green Washer-Extractor must be used. It is heavy duty, has dual temperature controls, has infinitely variable wash and extract speeds, and has both fully automatic and manual override features. Cold water is used during washing.
Drying and Finishing
Leather garments are hung to dry overnight and then tumbled at about 90oF for up to 30 minutes to soften and activate water repellent agents. The pressing and finishing hardware and process are the same as for traditional solvent cleaning. Both processes have similar shaping and finishing requirements.
Both the KSL and UniMac machines require minimal maintenance. Training is offered by KSL.
No independent performance testing has been conducted or is being planned. The performance information that is presented in this case study was provided by representatives of KSL.
Similar to endorsements given by cleaners of woven or knit fabrics, KSL asserts that its main benefits, relative to traditional solvents, are the ability to process almost all garments, better color retention, no solvent odor, and improved stain removal. The process also replaces vital oils important to leather appearance and wear. KSL states that it can now clean more than 95 percent of all leather and suede garments. Of the remaining 5 percent, half could be better processed using other solvents (e.g., excessive grease and oil stains) while the other half cannot be safely cleaned by any method (e.g., burns and ink dyes).
- Problem stains. Relative to perc cleaning systems, the KSL machine wetcleaning process is superior at removing water soluble stains such as blood and other bodily fluids. The perc process is better at removing fatty stains, grease, paint, and varnish.
- Problem fabrics. The KSL process is superior at removing stains from vinyl, while perc is better at removing stains from rayon. Both are outstanding at removing stains from wool, polyester, silk, and leather.
- Garment damage. The KSL process and traditional perc processes are safe on fabrics. However, the KSL process causes considerably less damage to buttons, fasteners, coloring, and adhesives, resulting in significant labor
- Shrinkage/Wrinkling. The KSL process and perc processes rarely result in shrinkage or wrinkling.
- Prespotting. Both the KSL process, and perc processes, require about the same amount of prespotting.
- Color retention. Machine wetcleaning is a superior process with respect to resistance to discoloration, color loss, dye bleeding, and ability to process multicolor garments. Perc processes often result in color loss.
- Hand and feel. The KSL process was designed to restore leather to its original softness and feel.
- Solvent odor. The KSL process leaves no residual odor.
- Cycle Time–Washing. The KSL process requires a 30- to 40-minute wash cycle whereas the perc processes require only 15 to 20 minutes.
- Cycle Time–Drying. Leather garments cleaned by the KSL process are hung overnight followed by brief tumbling, whereas garments cleaned via the perc process are machine-dried in 1 hour.
- Labor For Finishing. Garments cleaned by the KSL process require 15 percent more finishing labor than garments cleaned by the perc processes.
- Pilling. The KSL process substantially reduces pilling (a result of air drying). Perc processes require tumbling during the drying phase, which can easily cause pilling.
- Adhesives. The KSL process has no effect on the adhesives used in leather garments. The perc process dissolves adhesives often creating stains or requiring regluing.
- Oil replacement. The KSL process replaces necessary oils that are lost during the use of a suede or leather garment. Perc functions as a degreaser, causing garments to lose the oil and lubricants applied during tanning.
Environmental, Safety, & Health Impacts
The environmental, human health, and human safety impacts resulting from the wetcleaning process are less than the impacts associated with the use of traditional solvents. However, the volume of water used for wetcleaning is greater than that required for traditional drycleaning processes. Wetcleaning wastewater, if left untreated and discharged directly into a lake, river, or stream, could pose risks to aquatic life. However, it is normally the case that such wastewater is discharged into a public sewer system and treated at the local publicly-owned wastewater treatment facility in accordance with Federal Clean Water Act requirements. Under these normal circumstances, risks to aquatic life are minimized. Potential human health and safety impacts are essentially limited to minor skin and eye irritation. Skin and eye exposure to the cleaning agents can be minimized through adherence to proper operational procedures.
The wetcleaning process does not produce hazardous wastes, hazardous air emissions, greenhouse gases, or ozone depleting substances. The spotter and four cleaning agents are nonsolvent formulations that are biodegradable and generally benign, although eye contact should be avoided due to potential irritation. Because the KSL system does not generate hazardous waste, the regulatory burden associated with wetcleaning is much less than the regulatory burden associated with traditional drycleaning processes.
The KSL process consumes up to 35 percent less energy compared to traditional solvent processing because it does not require heated water or substantial heat for drying purposes. Water consumption (150 to 200 gallons per 100-lb. load) is about the same as that associated with the perc process, which requires water for cooling.
KSL sells wetcleaning washers and dryers separately. The 100-lb KSL/Midwest Clean & Green Washer-Extractor is priced at approximately $19,500. The 35-lb UniMac UW35P3AU1 washer and microprocessor are priced at approximately $7,600. The company recommends using dryers with a 50- to 100-lb capacity, a stainless steel basket, reversing motion, and rigid temperature control. Dryers are priced at approximately $5,000. KSL requires the same finishing equipment that is required for drycleaning and can recommend pressing and finishing equipment.
KSL indicates that relative to drycleaning, KSL licensees find the company’s process to be less costly to operate. This is due to lower costs for labor, energy, prespotting, and the elimination of solvent supply and disposal costs. Processing costs are 4 to 21 percent lower than perc systems and 12 percent less to 4 percent higher than petroleum systems. Electrical and natural gas costs average 35 percent less than drycleaning costs because KSL does not require heated water or substantial heat for drying. Finishing requires 15 percent more time, but overall labor is lower than that associated with perc processes as there is less damage and fewer reglues are required. Floor space requirements are the same for each process. Large-volume KSL operators have reduced operational costs by 20 percent. Smaller cleaners have reduced these costs by smaller margins.
Impact on Businesses
According to KSL representatives, the KSL process performs better than traditional drycleaning, reduces environmental impacts, reduces human health and safety impacts, costs less to operate than traditional drycleaning, and removes 95 percent of all stains and soils. The cleaning cost per leather garment is competitive with traditional drycleaning–approximately $30 to $40.
Relative to traditional drycleaning, the environmental regulatory burden associated with the KSL process is significantly reduced. The need to comply with the Federal and state hazardous waste regulations and with the Federal and state water quality regulations is eliminated.
What is Design for the Environment?
EPA’s Design for the Environment (DfE) Program is a voluntary initiative that forges cooperative partnerships among government, industry, academia, and environmental groups. One of the primary objectives is to incorporate environmental concerns into the design and redesign of products, processes, and technical management systems.
One of the goals of the DfE Garment and Textile Care Partnership (GTCP) is to provide cleaners with information that can help them run their facilities in a way that is safer for workers, more environmentally sound, and more cost effective. To accomplish this goal, the program utilizes EPA expertise and leadership to evaluate the environmental and human health risks, performance, and cost tradeoffs among clothes cleaning technologies. DfE disseminates information to all interested parties and assists businesses in implementing cleaner technologies.
The GTCP is preparing several documents addressing environmentally-preferable clothes cleaning technologies. In the near future, these and other case studies will be available on the GTCP Web site and in hardcopy and include:
- Case Study: Liquid Carbon Dioxide Surfactant System for Garment Care (EPA 744-F-99-002)
- Case Study: Wetcleaning Systems for Garment Care (EPA 744-F-98-016)
For More Information
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- For more information about Kirk’s Suede-Life Clean & Green, contact:
Kirk’s Suede-Life, Inc.
2501 West Fulton Street
Chicago, IL 60612
Telephone: (800) 447-5475
Fax: (800) 441-8640
- Contact the EPA Pollution Prevention Information Clearinghouse (PPIC) to receive an information packet about EPA’s DfE Program or the Garment and Textile Care Partnership, or to request single copies of DfE documents, or a revised DfE Publications list:
- Pollution Prevention Information
U.S. Environmental Protection Agency
1200 Pennsylvania Ave. NW (7407-T)
Washington, DC 20460-0001
- Visit the EPA DfE Garment and Textile Care Partnership Page.
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Source: May 2009 at natclo.com
A growing concern for the environment has spurred the search for more environmentally friendly methods of cleaning suedes and leathers.
The result was the development of the wetcleaning process which has been called the ultimate processing method for cleaning suedes and leathers.
Wetcleaning is the industry term used to describe washing or laundering drycleanable articles using water as the cleaning fluid and additives like water soluble detergents, conditioners and auxiliary treatments like dye setting and sizing.
Washing suedes and leathers
Washing suedes and leathers can be found in the processes performed in tanneries where the skins of animals are made into leather. Washing the skins in water is used extensively throughout the tanning process which starts with washing the salt-cured, blood-soaked skins after they arrive at the tannery from the slaughterhouses; continues throughout the tanning process with treatments that use water as the liquid carrying agent for the tanning chemicals and dyes as well as for rinsing them out; and ends with a fine spray of water on the leather to establish the final desired moisture level in the skins.
In more developed countries like the United States, wetcleaning of suedes and leathers was not used to process all items because drying was time consuming compared to modern high production-oriented leather drycleaning operations. In less developed countries, wetcleaning of suedes and leathers was quite common because these nations did not possess the capital, technology, machinery, solvents or chemicals for modern, efficient, high-quality leather drycleaning.
However the advent of modern wetcleaning products and equipment enables leather cleaners to meet environmental concerns and wetclean suedes and leathers safely and efficiently.
Wetcleaning can be especially advantageous where items with water-soluble stains caused by blood, vomit or milk products that have soaked into the suedes or leathers. It is also better for wetcleaning distressed leathers and items trimmed with vinyl. Wetcleaning these items could be the only way to safely clean and restore them to a usable condition.
Suede and leather wetcleaning equipment can be as simple as a bucket, a sink, a tub or some other type of of container. It can be done in a simple washing machine like a small home washer if volume is not too great.
A home washer can wetclean four to 12 suedes or leathers an hour. It can also be done in larger standard commercial laundry washers for greater output. Or it can be done in modern wetcleaning machines equipped with washing cycle programs that control drum rotation, mechanical agitation, timing of multiple cycles, water temperature, water level injection of additives, extraction speeds and duration, etc.
In most cases, the cycles of these machines can be custom programmed in accordance with information from the detergent and additive manufacturers. Wetcleaned items can be dried by hanging to dry in the air or by tumbling in a cool tumbler or by using a special dryer that can be programmed to sense and control moisture level and temperature.
An existing washer can be used to start wetcleaning suede and leather. Drying can be accomplished by hanging or tumbling in a cool tumbler. The home washer will do if no other wetcleaning equipment is available. Or the shirt laundry washer can be used if it is available. One or two pieces of old suede or leather can be wetcleaned to build confidence. From there it is off to the races!
The additives used to wetclean suedes and leathers must be biodegradable, non-hazardous, non-flammable and non-solvent in order to meet government regulations when the used wash water is dumped into existing sewer systems.
In addition, they must be able to restore suede and leather to its original softness, without glue bleed problems, without shrinkage, without color loss, without color bleed on multicolored items and on cloth, suede, leather or vinyl combinations.
The most essential additives required to safely wetclean suedes and leathers are the prewash dye fixer, the main wash detergent conditioner and the prefinish rinse conditioner.
The most important additives are the detergent and the conditioner used in the main wash cycle. The detergent is used to remove and suspend stains and water soluble soils and to prevent them from redepositing on the items being wetcleaned. It must be effective in cold or warm water.
The purpose of the conditioner is to to prevent color loss and bleeding of the dyes and to retain the softness of the skins during the main wash cycle. The ideal situation is achieved when these two additives are combined into a single product such as Royaltone’s Prosuede Wet.
The next most important additive required to wetclean suedes and leathers is the prefinish softener conditioner rinse. The purpose of this additive is to provide added softness on the final rinse cycle that will aid in press finishing. These conditions can be achieved with a product such as Royaltone’s Leather Soft.
The next important additive required to wetclean suedes and leathers is a prewash dye fixer. The purpose of this additive is to set dyes that testing indicates are water soluble. This can be accomplished with a product like Royaltone’s Leather Fix.
Other additives that are also useful include a sizing like Royaltone’s Leather Size, which will restore body and firmness to suede and leather items that become limp because they contain water soluble sizing which is removed in the wetcleaning process.
While most water soluble stains can be removed from suedes and leathers in wetcleaning, some prespotting may be necessary with a biodegradable wetcleaning prespotter like Royaltone’s Leather Magic. Oily solvent soluble stains such as paint, oil, grease, etc., must be removed with a non-oily POG stain remover like Royaltone’s Spot Magic prior to wetcleaning any suede or leather. The non-oily POG will flush out in the wetcleaning without leaving an oily ring.
Likewise ink stains must be removed with a non-oily ink remover like Royaltone’s Ink Magic prior to wetcleaning.
To start wetcleaning suedes and leathers in an existing washer, these additives are available in an inexpensive trial kit from Royaltone that comes with step-by-step written and audio cassette instructions.
Source: May 2009 at natclo.com, Frank Lucent
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