What are the functions of waterproof and breathable functional fabrics (fabrics)? What is waterproof fabric (fabric) used for? What does waterproof and breathable fabric (fabric) mean?

2. TPU film

TPU is the abbreviation of thermoplastic polyurethane film, which is a non-porous hydrophilic film. Since the film itself has no pores, the waterproof effect is naturally very good, and it also makes the fabric windproof and warm. Moisture permeability is mainly achieved through its hydrophilic properties. It relies on the difference in vapor pressure inside and outside the clothes to transfer steam from places with high pressure to places with low pressure, thereby achieving the function of moisture permeability. I have also been engaged in the production of TPU composite fabrics for a long time, so I will give a brief introduction.

Product properties:

A. Green and environmentally friendly

B. Excellent breathability and moisture permeability

C. Absolutely waterproof, anti-blood stain, antibacterial

D. Windproof and cold-resistant, velvet-proof and smooth

E. Durable, super water-repellent finish

F. Easy to remove and clean, can be washed normally

Applicable scope:

A. Field military uniforms, firefighting, and military special clothing

B. Protective equipment, military tents, sleeping bags and postal bags

C. Sportswear for mountaineering, skiing, golf and other sports

D. Materials for shoes and hats, bags, blackout curtains, anti-UV umbrella cloth

E. Rainproof, breathable poncho, casual windbreaker

F. Medical insurance supplies

Product specifications:

1. Door width: 1500mm

2. Product thickness: 0.012~0.025mm

3. Low-permeability transparent mask, low-permeability fog mask, low-permeability milky white mask

Moisture permeability index: greater than1000g/m2*24hrs (ASTM E96 BW 2000 version)

Hydrostatic pressure resistance index: greater than 10000mmH2O (AAFGBHGYUTKUTCC 127)

4. Medium-transparent transparent mask, medium-transparent mist mask, medium-transparent milky white mask

Moisture permeability index: greater than3000g/m2*24hrs (ASTM E96 BW 2000 version)

Hydrostatic pressure resistance index: greater than 10000mmH2O (AATCC 127)

5. High-permeability transparent mask, high-permeability mist mask, high-permeability milky white mask

Moisture permeability index: greater than5000g/m2*24hrs (ASTM E96 BW 2000 version)

Hydrostatic pressure resistance index: greater than 10000mmH2O (AATCC 127)

6. Suitable for lamination of various fabrics such as knitted, woven and non-woven fabrics

The most popular TPU composite fabrics on the market are:

1, four-sided elastic + TPU + polar fleece, which is what people often call Soft Shell. The four-sided bomb is mainly 75D (for women)On. All coated or laminated fabrics are secured to the support frame with rubber rings, with the coated or laminated side facing outward. Sample support system installed to float on23℃The water temperature in the water tank shall prevail. After testing the quality of the test cup (including sample, desiccant and film) with the film facing upwards, quickly turn the test cup upside down and place it into the sample holder. This assembly method is placed at a constant temperature of 30℃±2℃In the device. After 15 minutes, take the test cup out of the thermostatic device, turn it upside down and measure its weight. Water vapor permeability is calculated according to the formula WVT=24*△m/(s*t).

In moisture permeability testing, Japan’s desiccant cup method seems to be more favored by manufacturers because it can be quickly tested on smaller samples. Control of relative humidity in the environment is not required, and test equipment and consumables are less expensive. This method gives high moisture vapor transmission values, which is preferred by manufacturers, and correlates well with the perspiration hot plate method (used by many researchers). ,

3. Test method of concern: ISO 11092 sweating hot plate method

The hot plate test method is a device used to test and simulate the heat and mass transfer process that occurs close to the skin. From the testing principle, the sweating hot plate test method belongs to the evaporative heat transfer impedance method, which is used to measure the resistance of different types of fabrics to water vapor (water vapor impedance refers to the vapor pressure difference on both sides of the fabric divided by the direction of the pressure gradient. total evaporation heat flow per unit area). The higher the evaporation resistance, the worse the breathability of the fabric; the lower the evaporation resistance, the better the water vapor permeability, or the sweat hot plate method tests the vapor heat transfer resistance. The evaporation resistance test value (Ret value) range is generally 148.7~3.9m2Pa/w.

When the Ret value is less than 6, it is considered extremely breathable and comfortable to wear at high exercise levels; when it is between 6 and 13, it is considered very breathable and at high exercise levels. The wearing comfort level is average, but it is comfortable to wear at ordinary exercise levels; between 13 and 20, it is breathable, and it is uncomfortable to wear at high exercise levels, but comfortable to wear at ordinary exercise levels; between 20 and 30, it is breathable. It is low breathable, very uncomfortable to wear at high exercise levels, but generally comfortable to wear at low exercise levels; when it is above 30, it is not breathable, and uncomfortable to wear at all exercise levels.

The sweating hot plate method is being adopted by more and more businesses because it is more reasonable. However, the big problem facing China is that there is currently no testing agency that can do this test, and Hong Kong can’t do it either. Taiwan’s Textile Association can do it, but it doesn’t have the qualifications for certification. Because of this, domestic fabric manufacturers do not know enough about this test and are unable to determine how to choose the correct film and process. This year, a brother company suffered heavy losses because it could not reach a Ret value of 13.

Methods for testing fabric moisture permeability are mixed, and the results of various test methods are not relevant or comparable. Therefore, determining the test method is the prerequisite for all indicators. We often see how high the waterproof and moisture permeability indicators are on some brands, but they do not indicate which testing method to use.

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