The hotel linen laundry industry is transforming its washing processes, driven by multiple key factors (environmental protection, reducing costs and boosting efficiency in hotels, and linen quality control). In the past, laundry plants used high-temperature main washing (above 70℃). This can remove stains and whiten linen. It also achieves disinfection. However, high-temperature washing causes many issues, such as high steam consumption, accelerated cotton fiber aging, and linen wear and tear. Nowadays, new laundry chemicals (low-temperature enzyme products and activated oxygen bleaching) have become advanced. The low-temperature washing process (around 40℃) is gradually gaining attention from laundry plants.
Some linen laundry plants have started trialing low-temperature washing processes, which are accepted by boutique hotels and high-end hotel chains. In traditional high-temperature washing, cotton bed sheets and duvet covers can be washed up to 130-150 cycles. But low-temperature washing can achieve up to 160-200 cycles. Hotels and linen rental laundry plants can reduce linen investment significantly. Meanwhile, low-temperature washing reduces steam consumption, which meets energy-saving and carbon-reduction goals. However, many laundry plants think that low-temperature means just lowering the water temperature. They still use high-temperature wash formulas. This causes loss of linen whiteness and an increased rewash rate. Low-temperature washing is a comprehensive system. Water temperature, laundry chemicals, mechanical action, and water quality must be properly adjusted.
Core Advantages of Low-Temperature Washing
● Extend linen service life and reduce purchase costs
Cotton linen wear and tear mainly comes from mechanical wear and chemical degradation. High temperatures and alkaline conditions accelerate the hydrolysis and oxidation of cotton fibers. Thus, fibers become brittle and lose strength. Linen service life is also shortened. According to industry data, cotton bed sheets, duvet covers, and pillowcases can be washed around 130-150 cycles. Low-temperature washing with enzyme-based laundry products and oxygen bleaching significantly reduces heat and chemical damage. Industry practices show that if the main wash temperature is lowered from 70℃-80℃ to 45℃-60℃, the average linen service life can be increased from 120-150 cycles to 180-200 cycles.
● Maintain linen whiteness and slow down linen yellowing and aging
Operators think that low-temperature washing causes linen yellowing. In fact, this is a catalytic oxidation caused by metal ions and alkaline residue deposits under high-temperature conditions. Calcium and magnesium ions bind alkaline agents and soil. This may cause irreversible linen yellowing. However, low-temperature washing uses chelating agents and oxygen bleaching systems. This can reduce metal ion deposits and maintain linen whiteness. Besides, test data show that after 100 wash cycles, the loss of linen whiteness during high-temperature washing is 27% greater than that of low-temperature washing. Low temperature cannot whiten heavily soiled linen. Linen whiteness can be maintained with specialized low-temperature activated oxygen bleaching.
● Reduce energy consumption and steam costs
During linen washing, energy is mainly used for heating wash water. Industry data show that for every 10℃ reduction in the main wash temperature, the heating energy consumption decreases by around 15-25%. The lower the temperature, the greater the energy savings. Take the traditional high-temperature washing as an example. Adjust the main wash temperature from 65℃-70℃ to 40℃. The heating energy consumption can decrease by at least 35%. Currently, steam and energy prices fluctuate, while energy consumption costs continue to rise. This energy-saving advantage becomes more important.
● Ensure cleanliness and control rewash rate
Low-temperature washing isn’t just about lowering the main wash temperature. It relies on multi-enzyme formulations (protease, amylase, and lipase). This helps break down sebum, blood, and protein-based food stains at 30℃-40℃. Standardized low-temperature washing can control the rewash rate within 2%. This is comparable to that of traditional high-temperature washing. However, heavy grease, tea, and coffee stains are hard to remove in one go. They require localized pre-treatment or a heavy-soil wash program.
Kingstar Laundry Equipment Solutions
Low-temperature washing isn’t about using room-temperature water. It means controlling the water temperature within 40℃ during the main wash. It also uses specialized low-temperature laundry chemicals and mechanical action to remove stains and support bleaching and disinfection, rather than relying on high temperature (above 70℃). The recommended main wash temperature is between 30℃ and 40℃. Compared with the high-temperature main wash (above 70℃), low-temperature processes reduce heating energy consumption and extend linen service life. Kingstar tunnel washers and industrial washers can support low-temperature washing.
It is designed for laundry plants with high laundry volume and continuous operation. It ensures consistent quality during low-temperature washing via equipment design and program control.
The water reuse system and thermal insulation design lay a foundation for low-temperature washing. The pre-wash cycle uses reclaimed water with residual heat. The main wash compartment is equipped with a thermal insulation design. This can reduce heat loss. Chemical dispensers precisely dose low-temperature detergents. This delivers consistent washing results.
Kingstar tunnel washer uses a PLC-based control system. The heating compartment’s temperature, as well as time, water levels, and chemical dosage in other compartments, can be programmed. It also supports one-touch switching between low-temperature and high-temperature washing programs. Process parameters can be adjusted and controlled. The whole process is traceable.
It is equipped with specialized low-temperature washing programs. They can deliver consistent washing results.
Set the main wash temperature to 35℃-40℃. Adjust the processing time based on linen conditions and soil levels. Also, low-temperature chemicals are precisely dosed by chemical dispensers.
Kingstar industrial washer uses a high-sensitivity temperature control system. Automatic heat compensation helps keep the main wash temperature within a reasonable range. The machine automatically follows the low-temperature washing requirements and parameters. This reduces inconsistent washing quality caused by operators’ unfamiliarity with new processes.
Notes for Chemical Selection
Chemical selection is critical for low-temperature washing. High-temperature laundry chemicals can cause many issues (such as poor stain removal, ineffective bleaching, and excessive residues) in low-temperature washing.
● Low-temperature multi-enzyme system
Main-wash detergents contain protease, amylase, and lipase. Enzyme products are effective between 30℃ and 40℃, where they break down bodily secretion stains effectively. Common high-temperature laundry powders lack low-temperature enzymes. Their cleaning performance declines at low temperatures.
● Low-temperature activated oxygen bleaching
Avoid chlorine-based bleaching agents. They are less effective in cleaning at low temperatures. They can also damage cotton fibers. Conventional oxygen bleach activates slowly at low temperatures. With oxygen bleach activators, it can whiten linen below 40℃.
● Chelating capacity
Calcium, magnesium, and iron ions in the wash water consume detergents. This causes linen graying and stiffness. Also, chelating capacity can bind metal ions in water. This prevents deposits on linen fibers. If the water hardness is relatively high, use a water softening system.
● pH value control
A mildly alkaline system is recommended for low-temperature washing. The pH value is controlled between 8.0 and 9.5. High-alkalinity laundry powders aren’t suitable for low-temperature processes. They are limited in removing stains. They can also damage cotton fibers and reduce enzyme activity.
● Chemical dosage adjustment
Low temperature doesn’t mean just increasing chemical dosage. This should be properly adjusted based on linen soil levels, load volume, and water hardness. Excessive dosing can make rinsing difficult. Detergents may remain inside fibers. Thus, linen may become sticky and easily get recontaminated. Laundry chemicals should also be properly stored. Enzyme agents are sensitive to high temperatures and moisture. They should be stored in a cool, dry area. This protects enzyme activity.
Conclusion
Low-temperature washing isn’t about lowering the water temperature. It is a systematic solution considering linen service life, washing quality, and energy consumption costs. As hotels are attaching importance to linen hygiene, appearance and texture, and total costs, low-temperature washing will become more popular. However, laundry plants shouldn’t follow the trend blindly. Consider existing equipment, water quality, and hotel linen characteristics. Choose proper laundry chemicals and process parameters. Therefore, low-temperature washing can realize its benefits.
Q&A
Q1: What capacity should the tunnel washer be chosen for?
A1: This depends on average daily laundry volume, peak production capacity, sites, steam, water treatment, labor, and finishing capacity. Wrong capacity can cause investment waste or processing bottlenecks. Kingstar provides 60 kg and 80 kg tunnel washers. We can customize solutions based on your actual working conditions.
Q2: Can low-temperature washing cause linen yellowing?
A2: Linen can maintain whiteness with proper processes and laundry chemicals. But high temperatures may set some stains. This develops yellow stains that are hard to remove.
Q3: Does Kingstar laundry equipment support low-temperature washing?
A3: Yes. Equipment parameters can be adjusted based on the required temperatures and processing time.
Post time: Nov-13-2026