- THE MAGAZINE
Low-moisture carpet-cleaning technologies are changing so rapidly that it has become difficult to keep up with all the new developments. The chemistry and equipment are evolving at an increasingly faster rate, creating incredible expectations and anticipation for what the future might bring.
Since much of this technology is relatively new, the greatest need is to increase the level of knowledge across the entire industry, from the chemical and equipment manufacturers to the carpet mills and professional cleaners (the Low Moisture Carpet Cleaners Association published a White Paper in 2006 defining the basics of low-moisture cleaning to lay the groundwork for assisting professionals in decisions regarding low-moisture carpet cleaning methods and the optimum environments for their use.).
In a nutshell, the term “low-moisture carpet cleaning” refers to methods and/or procedures that allow carpet fibers to dry to their natural state in two hours or less. The key to low-moisture carpet cleaning is to reduce the freestanding moisture in the carpet, enhancing the carpet’s ability to dry very evenly and very quickly, eliminating large spots created by pooled moisture and other problems associated with excess moisture.
Essentially, low-moisture carpet cleaning generally describes methods that clean with water at levels below the saturation point of the fabric. When the fiber has reached its saturation point, it cannot absorb more water. All additional water becomes freestanding water, and can puddle on the backing or travel down beyond the backing onto the subflooring and even into the subflooring.
Fueling this movement are the new carpet-cleaning chemicals available today. These new encapsulation chemistries have re-ignited interest in methods that were long questioned because they were known to leave residues contributing to re-soiling. These new chemistries actually use the residues as part of the cleaning process; they rely on the equipment for the agitation, while the new chemicals help cause the soils to dry to a particulate that allows them to be removed through vacuuming. In order to get a better understanding of how low-moisture carpet cleaning systems work, we need to start by understanding how the chemicals work.
Next, manufacturers added a compound known as Ludox, a wax-like substance thought to fill the grooves and crags in natural fibers to prevent soil from being caught. It was an improvement; however, it certainly did not solve the re-soiling problem. In fact, it brought on a host of other problems related to the dirty slurry created during the cleaning process, which was ultimately caught in the drying process. It caused the carpets to loose their ability to refract light properly and the carpets would tend to “ugly out” after repeated cleanings.
In the ’50s and ’60s we went through the phase of detergent “encapsulation.” The chemicals would separate the dirt from the fiber, encapsulate the soil, and either be allowed to dry out and then vacuumed, absorbed into an absorbent media or be flushed out with extractors. This was an improvement over the old soaps, and it did mark the start of reducing re-soiling, but it didn’t eliminate the problem.
The potential negative aspect of the use of acrylics revolves around the dirty slurry that is created during the cleaning process. Obviously, some of this residue gets left behind in the fiber, and the problem is that it is no longer clear, clean acrylic-laced detergent. It would become more of an amber brown acrylic crystal created from mixing with soil during the cleaning process. The obvious danger of this approach is that some of the acrylic “shell” can be left on the fiber. Then, the bigger problem becomes one of trying to “strip out” the residual acrylics without using strippers, which would be deleterious to the carpet.
In the ’90s fluorocarbon chemistry was introduced to carpet-cleaning chemicals; it has been referred to as “second-generation encapsulation chemistry.” The concept was to leave a Teflon-like substance behind on the fiber, causing dirt and soil to slide off the fiber, like a fried egg slides off a frying pan. The concept had great promise, but again there were some potential pitfalls. Also, the government had some concerns surrounding the long-term health effects of fluorocarbons, a debate that still rages.
On a more relevant note, many were found to be hygroscopic, meaning that they attracted moisture from the atmosphere (dampening the carpet in humid conditions), which in itself could easily contribute to re-soiling. It is important to note, however, that it’s not correct to state categorically that fluorochemicals cause re-soiling; it depends a great deal on the quality and the quantity of the fluorocarbons being used in the formulation.
This means improvements can be achieved with its use in all carpet-cleaning methods, including hot-water extraction; rotary bonnet systems; foam shampooing; powder extraction; oscillating bonnet systems; cylindrical bonnet systems; counter-rotating cylindrical brush machines; and spot and stain removal operations, as well as sanitizer rinsing. In almost every case, the machines are used to agitate the solution in the carpet so the encapsulation process can capture the soil for removal at a later date through vacuuming. In one case, cylindrical bonnets are actually extraction-cleaned during their rotation.
In every case, the carpets appear very clean after the operation, even though some of the soil is still in the carpet. The soil left in the carpet dehydrates into a powder at the sub-surface level, unseen by the naked eye. It is through thorough vacuuming that it is completely removed.
There are many top-notch carpet-cleaning chemicals on the market today, available from a multitude of manufacturers. Unfortunately, the amount of junk on the market seriously outweighs the amount of good stuff. It is difficult and expensive to build a high-quality encapsulation product. Designing good encapsulation chemistry requires extensive R&D and sophisticated manufacturing processes, and so the cost is higher. The reality is, high-quality encapsulation products sell for $20 to $30 per gallon, sometimes more. This is in part due to the use of high-quality ingredients that will not interfere with the encapsulation process; overloading a chemical with cheap perfume oils and improper blending of low-grade fluorocarbon technology will definitely interfere with the encapsulation process (Note: This is not to be confused with the use of trace amounts of high-quality, purpose-specific fragrance oils and the proper use of high-grade fluorocarbon technology which may not interfere with the encapsulation process at all.).
The disturbing thing is that we have all seen encapsulation claims on products being sold for as little as $5 per gallon. There are numerous products out there that dry very slowly (and some that may never fully dry); products that use silicones; products that use lousy fluorocarbon technology; products blended improperly; products that separate; products that are highly discolored and cause discoloring on the carpet, etc.
Professional using carpet-cleaning chemistries may want to do some “bench chemistry,” testing on their own to make decisions about products. Don’t just take anyone’s word on it when you can actually do the tests yourself and form your own opinions. The results may truly surprise you.
The use of low-moisture carpet cleaning systems can increase the performance and appearance of the carpet, extend its useful life, enhance the ability to service carpet and minimize the downtime. Any way you look at it, it is a tool that should be considered by all professional carpet cleaners.