Experts Explain: Sun-drying Blankets for 2-3 Hours is Ideal; Excessive Sun Exposure Can Damage Warmth.
With the arrival of summer, many families are frequently sun-drying their bedding to kill bacteria and dust mites. However, many people still have misconceptions about how long it takes to sun-dry blankets to kill dust mites. Recently, several health experts and disease control agencies have reminded the public that sun-drying blankets for longer periods is not necessarily better. Scientifically determining the duration and frequency of sun-drying is crucial for achieving optimal dust mite removal and blanket protection.
High-Temperature Dehydration is Key; 2-3 Hours is the Golden Time
According to scientific data, dust mites thrive at temperatures between 20°C and 25°C and relative humidity between 70% and 75%. When the ambient temperature reaches above 50°C, dust mites will die from dehydration. Under direct sunlight at midday in summer, the surface temperature of bedding can typically reach 50°C to 60°C. Continuous exposure for 2 to 3 hours can kill over 97% of surface mites.
Experts point out that the core principle of sun-drying bedding is to use the high temperature of sunlight to dehydrate mites, while ultraviolet rays damage the DNA structure of microorganisms. However, prolonged exposure (such as more than 4 hours) can cause the internal fibers of the bedding to break and age, not only failing to further enhance the mite-killing effect but also reducing the fluffiness and warmth of the bedding. Furthermore, the air humidity is higher in the early morning and evening, making it easy for bedding to become damp again during this time, providing a breeding ground for mites.
Sun-drying bedding for mite removal has limitations and needs to be combined with physical cleaning.
Although sunlight is a natural "bactericide and mite killer," its effect has certain limitations. On the one hand, ultraviolet rays have limited penetrating power, and mites, with their instinct to avoid light and seek darkness, will migrate deeper into the bedding, making them difficult to eradicate completely. On the other hand, the main allergens that trigger allergic rhinitis, asthma, or dermatitis are the corpses of mites and their excrement; simply relying on sun exposure cannot remove these allergens from fabrics.
Therefore, disease control departments recommend that while airing out bedding, sheets and duvet covers should be washed with hot water (55℃ to 60℃ or higher), or a mite-removing device with powerful beating and vacuuming functions should be used for deep cleaning to thoroughly remove residual allergens.
Different materials require different treatment; avoid "violent" beating.
During the airing process, the strategy should be adjusted according to the material of the bedding. Cotton quilts are highly absorbent and can be aired out for 2-3 hours; synthetic fiber quilts only need 2 hours; however, down quilts, wool quilts, and silk quilts, which contain animal protein fibers, cannot withstand direct sunlight, as this can easily cause the fibers to become brittle and damaged. It is recommended to air them out in a cool, well-ventilated place for about 1 hour.
Furthermore, experts remind consumers not to vigorously beat quilts after airing them out. Violent beating not only causes warm air to escape, reducing fluffiness, but also causes fibers to break and clump together. The correct approach is to gently brush the surface of the quilt with a soft brush or lightly shake the quilt to remove surface dust and mite residue.
Experts urge the public to abandon traditional misconceptions such as "the longer the better" and "vigorous beating makes them cleaner," and instead create a healthy and comfortable sleeping environment by combining scientific airing with regular washing.