A dry cleaning machine is designed to clean garments and textiles using specialised solvents instead of water. The dry cleaning process combines cleaning solvents with mechanical action to help remove soil and certain types of stains from fabrics.
The term “dry cleaning” can sometimes be misleading because it does not mean that no liquid is used during the cleaning process. In fact, dry cleaning uses liquid cleaning solvents rather than water.
This method is commonly used for certain garments and fabrics that require specialised care, particularly when conventional water washing may cause shrinkage, deformation or changes to the shape and surface of the garment.
What Is Dry Cleaning?
Dry cleaning is a method of cleaning textiles using specialised solvents. During the cleaning process, garments are placed inside a rotating drum and brought into contact with the solvent. The movement of the drum creates mechanical action that helps the solvent interact with the fabric and remove soil.
Unlike conventional washing, dry cleaning does not use water as the primary cleaning medium. This makes the method suitable for certain garments that may not be compatible with water washing or that require reduced exposure to water.
However, not every stain can be completely removed through a standard dry cleaning cycle. Certain stains may require inspection and specialised pre-treatment before the garment is loaded into the machine.
How Does a Dry Cleaning Machine Work?
In principle, a dry cleaning machine cleans garments through a combination of solvent, mechanical action and a solvent treatment system.
Garments are loaded into the cleaning drum and the solvent is introduced into the system. The drum rotates to create movement, allowing the solvent to interact with soil on and within the fabric.
After the cleaning stage, the solvent is separated from the garments and sent to a treatment system. Depending on the machine design and technology, the solvent may be cleaned through a filtration system or processed through distillation before being recovered for further use.
The garments are then dried using warm air to remove remaining solvent. Solvent vapours may be captured and condensed back into liquid form within the machine's recovery system. Modern dry cleaning machines can incorporate solvent recovery systems to support reuse and reduce solvent losses during operation.
Main Components of a Dry Cleaning Machine
The specific construction of a dry cleaning machine may vary depending on the model and technology. However, a typical machine may include the following main components and systems:
- Cleaning drum: Holds garments and textiles during the cleaning process.
- Solvent tank or chamber: Stores the solvent used during the cleaning process.
- Solvent circulation system: Supplies and circulates solvent throughout the machine.
- Filtration system: Helps remove impurities from the solvent.
- Distillation system: Available on certain machines to process and recover solvent.
- Solvent recovery system: Recovers solvent vapours during the drying process.
- Drying system: Uses warm air to remove remaining solvent from garments.
- Control system: Manages machine settings and different stages of the cleaning cycle.
The Basic Dry Cleaning Process
A dry cleaning process involves more than simply loading garments into a machine. Before and after the cleaning cycle, garments may go through several preparation and finishing stages.
Garment Inspection and Preparation
Before cleaning, garments should be inspected to identify their condition, fabric type, care instructions and any details that require special attention. Foreign objects should also be removed from pockets before the garments are loaded into the machine.
Some decorative details or accessories may not be compatible with cleaning solvents or mechanical action. Early inspection helps determine the most suitable cleaning method.
Sorting and Stain Treatment
Garments may be sorted according to fabric type, colour, level of soiling and cleaning requirements. Proper sorting helps reduce the risk of unsuitable garments being processed together.
Special stains may require pre-treatment before dry cleaning. The treatment method should be selected according to both the stain and the characteristics of the fabric. This is important because not every stain can be completely removed by the solvent during a standard cleaning cycle.
Solvent Cleaning
Once prepared, the garments are loaded into the dry cleaning machine. Solvent is introduced into the drum and the drum rotates to create mechanical action.
During this stage, the solvent helps dissolve or remove certain types of soil from the garments. The solvent is also circulated through the machine's treatment system according to the equipment design.
Solvent Separation and Treatment
After the cleaning stage, the solvent is separated from the garments. Depending on the machine, the solvent may pass through a filtration system or a distillation unit to remove impurities before recovery.
Solvent treatment and recovery are important parts of the operating principle of professional dry cleaning machines.
Garment Drying
After solvent extraction, the garments are dried using warm air. The circulating air helps remove remaining solvent from the fabric.
During this process, solvent vapours may be recovered and condensed back into liquid form for further treatment or reuse within the system.
Inspection and Finishing
After the dry cleaning cycle is completed, garments should be inspected again. Items requiring further treatment may be returned for additional cleaning or stain removal.
The finishing stage may include ironing, pressing or reshaping garments before they are packaged and returned.
Solvents Used in Dry Cleaning
Solvent is one of the most important elements of the dry cleaning process. Depending on the technology and machine design, dry cleaning systems can use different types of cleaning solvents.
Some traditional systems use perchloroethylene, commonly known as PERC. Modern dry cleaning machines may also use other solvent options, including hydrocarbon-based solvents, silicone-based solvents and other solvent systems compatible with the equipment.
The selected solvent must be suitable for the machine design, operating requirements and the type of garments being processed. Solvents should not be changed or substituted without appropriate technical guidance.
How Is Dry Cleaning Different from Water Washing?
The main difference between the two methods is the cleaning medium. Conventional washing uses water together with laundry chemicals, while dry cleaning uses specialised solvents.
The appropriate cleaning method should be selected according to fabric characteristics and the manufacturer's care instructions. Some fabrics may be suitable for different cleaning methods, while others require specialised treatment to reduce the risk of damage.
For this reason, checking garment care labels and the actual condition of the item before cleaning is always important.
Important Considerations When Using a Dry Cleaning Machine
- Check garment care instructions before selecting a cleaning method.
- Sort garments according to fabric type, colour and cleaning requirements.
- Check pockets and remove foreign objects before loading garments.
- Pre-treat stains that require specialised treatment.
- Use solvents that are compatible with the machine and its operating requirements.
- Do not operate the machine beyond its designed capacity.
- Maintain the filtration, recovery and solvent treatment systems regularly.
- Follow applicable safety requirements when operating the equipment and handling cleaning solvents.
Conclusion
A dry cleaning machine uses specialised solvents together with mechanical action to clean garments and textiles. A complete dry cleaning process may include inspection, sorting, stain treatment, solvent cleaning, solvent recovery and treatment, drying and garment finishing.
Understanding how dry cleaning machines operate and selecting an appropriate cleaning method for different fabrics can help achieve better garment care while reducing the risk of unwanted effects on fabric characteristics and garment shape.
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