Wet Dry Filter
How Dry Cleaning Works?
When you drop your clothes off at the cleaners, the employees follow a pattern that holds true at just about any dry-cleaning operation running today. Your clothes go through the following steps:
1. Tagging and inspection – Some method, whether it is small paper tags or little labels written on a shirt collar, is used to identify your clothes so they don’t get mixed up with everyone else’s. Clothes are also examined for missing buttons, tears, etc. that the dry cleaner might get blamed for otherwise.
2. Pre-treatment - The cleaner looks for stains on your clothes and treats them to make removal easier and more complete.
3. Dry cleaning – The clothes are put in a machine and cleaned with a solvent.
4. Post-spotting – Any lingering stains are removed.
5. Finishing – This includes pressing, folding, packaging and other finishing touches.
The following sections look at each of these steps in detail.
Tagging
When you drop off your clothes, every order is identified. Although the exact identification process may vary from dry cleaner to dry cleaner, it basically includes counting the items and describing them (e.g., shirt, blouse, slacks). Also noted is the date they were dropped off and what date they’ll be ready for the customer to pick up. Then, a small, colored tag is affixed to each piece of clothing with a safety pin or staple, and this tag remains attached to the clothing during the entire dry-cleaning cycle. The dry cleaner also generates an invoice, and information about the order — including the customer’s name, address, and phone number — is entered into a computer. This helps to keep track of the order.
If a garment needs special attention, such as removing a red wine stain from a shirt or putting a double-crease in pant legs, there’s a special colored tag that gets affixed to that particular item of clothing. Once the clothing has been washed or dry cleaned, it goes through a quality check and the order gets re-assembled. This means the clothing is bundled together for the customer to pick up. Remember, every order is identified by a colored tag with a number on it so the person who re-assembles the order knows which shirts and which slacks go together and to whom they belong.
Pre-treating Stains
Pre-treating stains is similar to the procedure used at home when you apply a stain remover to stains prior to washing them. The idea is to try to remove the stain or make its removal easier using chemicals. You can even help the process, especially if you catch the stain early! Simply apply water for wet stains (a stain that had water in it) and solvent for dry stains (a stain that has grease or oil in it). Then, gently tap and blot both sides of the fabric with a soft cloth so the stain “bleeds off” onto the cloth. Then, rinse the fabric, let it dry and your cleaner will do the rest.
If you don’t know what to do when a stain happens, call your cleaner and ask them what to apply.
Dry Cleaning
While there are many brands and makes of cleaning machines, they are all basically the same in principle and function. A cleaning machine is a motor-driven washer/extractor/dryer that holds from 20 to 100 pounds (9 to 45 kg) of clothes or fabrics in a rotating, perforated stainless-steel basket. The basket is mounted in a housing that includes motors, pumps, filters, still, recovery coils, storage tanks, fans, and a control panel. In all modern equipment, the washer and the dryer are in the same machine. Doing this makes it possible to recover nearly all of the perc used during cleaning, which is better for the environment and saves the dry cleaner money.
As the clothes rotate in the perforated basket, there is a constant flow of clean solvent from the pump and filter system. The solvent sprays into the basket and chamber constantly — not only immersing the clothes, but gently dropping and pounding them against baffles in the cylinder as well. The dirty solvent is pumped continuously through the filter and re-circulated free and clear of dirt that gets trapped in the filter.
As an example, a typical machine might pump perc through the clothes at a rate of perhaps 1,500 gallons (5,678 liters) per hour. Perc is about 75 percent heavier than water. If a cycle lasts for eight minutes, the clothes would be doused during mechanical action with 200 gallons (757 liters) of solvent. This is more than adequate to thoroughly clean the clothes.
The next cycle drains and rapidly spins the clothes to expel the solvent and then goes into a dry cycle by circulating warm air through the clothes. The remaining fumes and solvent are vaporized by warm air and then condensed over cooling coils. The distilled solvent is separated from any water (that may have remained in the clothes or system) and returned to the tank as distilled solvent. Since any moisture that may have condensed into water during the process floats on top of perc, it is relatively simple to separate it.
Cleaning plants using petroleum solvent rather than perc are exposed to a different set of circumstances and face some challenging considerations. The solvent is flammable, and therefore many fire-prevention steps must be taken for safety. The solvent is very slightly lighter than water and the two mix easily. There is also a need for higher temperatures to dry and deodorize the garments, which makes shrinkage and re-deposition of soil into the clothes more likely. These disadvantages are the reason why the industry currently uses perc almost exclusively.
Regardless of which solvent the dry cleaner uses, the quality of cleaning, the degree of soil removal, the color brightness, the freshness, the odor and the softness all depend on the degree to which the cleaner controls his filter and solvent condition and moisture. Quality control can vary day to day unless the cleaner is constantly attentive to these factors.
Post-Spotting
Post-cleaning spot removal is another part of the quality control process. Post-spotting, as it is called, uses professional equipment and chemical preparations using steam, water, air, and vacuum. Post-spotting involves a fairly simple process for removing a stain. If the stain had water in it to begin with (bean soup, for example), then it takes water or wet-side chemicals to remove the stain. If the stain was on the dry side (grease, oil-base paint, tar, nail polish), it takes solvents or dry-side chemicals to remove the stain.
In home laundry, most wet-type stains come out during the washing process. Grease does not. The opposite is true in dry cleaning — it will leave the wet-side stains intact after the cleaning cycle. On the other hand, the solvent removes grease and oils during the cleaning cycle. The exception to this rule involves incorporating a “charge” of specially formulated dry-cleaning soap (an anhydrous emulsifier) into the cleaning cycle.
The dry cleaner will examine your clothes after cleaning is complete to see if any stains remain. If they do, post-spotting tries to get them out. A conscientious cleaner will remove the overwhelming majority of soil and stains, but there is always a small percent of very stubborn stains that may not be entirely removed for a variety of reasons, such as:
Tannin stains set by heat and time
Original dye stripped or faded
Bleached-out spots or sun-faded materials
Foreign dye deposit
Finishing
The final phase of dry-cleaning operations includes finishing, pressing, steaming, ironing, and making any necessary repairs to restore the garment. This is the least mysterious process since most dry-cleaning stores have their professional finishing equipment in plain view of customers.
Once the clothes are cleaned, they are pressed or “finished.” The steps in this process include:
Applying steam to soften the garment
Re-shaping it through quick drying
Removing the steam with air or vacuum
Applying pressure to the garment
The pressure comes from the head of the pressing machine, while steam is diffused through the bottom. Most machines not only emit steam, but can vacuum it out as well!
About the Author
954-978-0808
How A Wet/Dry Works and DIY Design
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