Hot Summer Fabrics Are Sunscreen At That Time.

< p > < strong > four ways to improve fabric sunscreen performance < /strong > < /p >

Deng Hua, Professor of Tianjin University of Technology, < a target= "_blank" href= "http://www.91se91.com/" > textile < /a > College, said in an interview with reporters that ultraviolet radiation on the fabric is partly reflected, partly absorbed and partly through the fabric. If the latter situation can be reduced, it will reduce the harm of ultraviolet radiation to the human body.

< /p >

What are the factors affecting the pmittance of ultraviolet light < p > < strong > < /strong > /p >

< p > fabric coverage factor, < a href= "http://www.91se91.com/news/" > fiber > /a > type, fabric color, chemical additives and testing parameters in finishing process.

The greater the coverage factor of fabric, the lower the UV pmittance.

The UV protection performance of fabric with the same structure increases with the increase of thickness and quality.

Different fiber types have different UV absorbability.

< /p >

< p > Deng Hua and others have found that the anti ultraviolet properties of different fabrics are different. It is learned from experiments that the dark colored fabrics have better protective properties.

Black and dark blue have lower UV penetration.

After repeated washing, the UV resistant fabric will affect its anti ultraviolet properties. The UV resistant a target= "_blank" href= "http://www.91se91.com/" > clothing > /a > will improve its UV resistance.

Generally speaking, wet clothing has lower UV pmittance than dry clothes. In addition, with the elongation of fabric, the UV pmittance of fabrics increases, and the UV protection coefficient decreases.

< /p >

< p > how to improve < a href= > http://www.91se91.com/news/index_c.asp > textile > /a > anti ultraviolet properties. There are four ways in general: first, direct selection of fibers with good UV resistance properties as raw materials to produce textiles, such as linen and polyester fiber; two, change the fabric's fabric structure, such as increasing the thickness and density of fabrics; three, add ceramic particles to reflect the ultraviolet rays when spinning the textile fibers, so as to achieve ultraviolet protection; four, make UV protection finishing on fabrics, such as UV Absorbents, blocking agents or anti ultraviolet coating finishing on fabrics.

< /p >

< p > Deng Hua explained that sunscreen products treated with sunscreen can usually achieve sunscreen effect. Because of different uses, the processing technology will be different.

Our national standard stipulates that only when the UPF value of the product is greater than 30 and the pmittance of UVA is less than 5% can it be called "anti ultraviolet product".

< /p >

< p > < strong > Product standard < /strong > < /p >

< p > global standard difference comparison < /p >

< p > at present, there is no uniform detection standard of ultraviolet protection textiles in the world. Various standards in various countries have adopted the instrumental test method to determine the UV protection performance of the products. The UPF value and ultraviolet pmittance of certain bands are the basic parameters to identify the UV protection performance of textiles.

National standards are basically the same in terms of UV performance testing methods, but there are great differences in sample preparation and grading labels.

< /p >

< p > national standard introduction < /p >

< p > Australian and New Zealand standards.

The two countries set the standard for the evaluation and grading of the protective clothing for sunlight. They are mainly used to determine the ultraviolet pmittance of protective textiles, clothing and other protective articles clinging to the skin. At the same time, the requirements for labeling ultraviolet radiation are put forward, which is a standard for integrating testing methods and labeling requirements.

< /p >

< p > European standard.

< a href= "http://www.91se91.com" > European textile > /a > UV protection standard consists of two parts: testing and grading label.

The fabric testing standard "EN13758.1 Textiles - ultraviolet protection of sunlight" - Test Method for clothing fabrics mainly aims at testing the UV protection performance of clothing fabrics, and does not apply to products that provide long-range UV protection, such as umbrellas, sunshades, etc.

The classification and labelling standards of clothing "EN13758.2:2003+A1:2006 Textiles - UV protection performance of clothing - marking and grading of clothing" have been required for the testing of clothing styles. The UV protection signs can be used only when the fabrics are tested and fulfilled according to the requirements of EN 13758.1.

< /p >

< p > American Standard.

The standard of textiles anti ultraviolet performance in the United States has increased the content of pretreatment and wet test for the practical application of sample simulation. The whole standard system consists of three parts: pretreatment, testing and grading label.

< /p >

< p > international standards for anti ultraviolet testing.

Aiming at the shortage of Australian standards, the association has developed UV Standard 801, which has added friction treatment, washing (water washing and dry cleaning), stretching and wetting to sample processing on the basis of Australian standards, simulating some situations that will occur during normal use of products.

After testing and certifying the products, certificates can be issued for a period of not more than one year.

< /p >

< p > China standard.

The evaluation of "GB/T 18830 Textiles - UV protection performance" formulated by our country not only requires testing methods, but also specifies the evaluation and label marking of ultraviolet protective properties of fabrics.

< /p >

< p > < strong > the difference between the standards is < /strong > < /p >.

< p > the standards for evaluating the anti ultraviolet performance of all countries are mainly based on UPF value, and the average pmittance of UVA or UVB should be considered properly.

The United States and Europe respectively set standards according to the test and grading labels. China and Australia attribute the test and grading labels to one standard. UV Standard 801 requires testing and certification of products.

In the standard system for UV protection testing, the United States has strengthened the standard requirements for pretreatment of fabric samples. UV Standard 801 has increased the preprocessing content of simulated practical applications, while European and Chinese standards are more focused on testing and grading labels.

< /p >

< p > how to determine whether a href= "http://www.91se91.com" > textile > /a > has UV protection performance. The US and Australian standards determine that UPF is greater than or equal to 15, the European standard is UPF greater than 40, the Chinese standard is UPF is greater than 30, UV Standard 801 is not required.

There are great differences in the judging standards of anti ultraviolet textile products all over the world, and the testing methods are different.

< /p >

< p > < strong > customer demand for sunscreen products < /strong > < /p >

< p > European and American buyers have different requirements for UV resistant textile products, and different standards will be adopted.

Their procurement requirements for UV resistant textiles are based on final product use, not on fabric type and finishing process.

For American customers, it is generally required to pre treat the products. After testing according to the AATCC183 standard, the ASTM D 6603 standard is used to evaluate the UV protection ability of the products. According to the product uses, the UV protection level and the different UPF values of the products need to be determined (see table 2).

European customers use the EN 13758.2 standard to evaluate the UV protection performance of the products. The UPF value of the anti ultraviolet products is above 40. However, a few European customers require the BS 7914 standard to determine the UV protection performance of the products.

< /p >

< p class= "MsoNormal" style= "margin: 0cm 0cm 0pt" > span lang= "EN-US" lang= "Microsoft";

< p > < strong > Evercolor shading cloth resistance to fading and brittleness < /strong > /p >

< p > seemingly ordinary a href= "http://www.91se91.com" > sunshade fabric < /a >, because it has to endure the sun and rain for many years, the problem of cracking and fading is always a big problem in the industry.

In particular, some shading fabrics for special industries such as yachts, chemical industry and other industries need to tolerate the test of seawater immersion and acid and alkali erosion.

However, the Evercolor sunshade cloth developed by Shanghai dream Industrial Co., Ltd. overcomes these problems. The shading fabric not only has the characteristics of resist fading and embrittlement, but also has good sunshade effect and energy saving and environmental protection characteristics.

< /p >

< p > what is the reason why Evercolor shading cloth has such characteristics? According to Liu Kang, general manager of the company, Evercolor sunshade cloth is the embodiment of high-tech crystallization in a product, including five major scientific and technological problems.

< /p >

< p > the problem of high color fastness.

The general fastness of clothing fabrics is 3~4 grade, while the Evercolor standard is 8, and the test time is two times. The difference is 16 times. There is a high standard of imported products in the market, but the price is very high.

Evercolor sunshade cloth conquered the problem of color fastness, and the cost dropped significantly.

< /p >

< p > at present, the shading fabrics on the market are mainly made of two kinds of materials, namely acrylic and polyester, and each has its advantages and disadvantages.

Acrylic fiber has good light resistance, but its heat resistance and mechanical strength are relatively poor.

The heat resistance and mechanical strength of polyester are relatively high, and the disadvantage is that it is not as old as acrylic fiber.

Evercolor sunshade cloth combines the strengths of the two fibers to overcome their shortcomings.

< /p >

< p > Special waterproofing technology.

The durability, waterproof and breathability of fabrics are a pair of contradictions.

The fabric is resistant to water pressure, water repellency and ventilation. This is an advanced technology in the world. Evercolor sunshade cloth has achieved this goal through thousands of experiments, and solved the technical problems of special waterproofing.

Therefore, the Evercolor sunshade cloth is waterproof and breathable, and people feel cool under the sun shade cloth.

< /p >

< p > the problem of pollution prevention and mildew prevention.

This problem can not be solved by simply coating the surface, but on the molecular level of the material, so as to achieve a long-term anti fouling and mildew proof effect.

< /p >

< p > completely blocking ultraviolet rays.

It is not difficult to block ultraviolet rays. It is difficult to irradiate under ultraviolet light for 5 years or even longer. The fabric itself is not brittle, and the UV protection coefficient is more than 50 (UPF>50). This requires the fabric itself to absorb ultraviolet light, and also to convert energy to make the fabric's mechanical strength not weaken.

< /p >

< p > Liu Kang told reporters that this sunshade cloth not only has a good sun shading effect, but also has the characteristics of energy saving and environmental protection.

The materials used in the products are of high mechanical strength. The dye has a special molecular structure. The color fastness is two times that of ordinary textiles, and it is not easy to fade or break.

According to the usual practice, the production of 1 tons of polyester fiber cloth cost 2 to 3 tons of petroleum raw materials, and the new process produces 1 tons of cloth. The fastness and durability of the fabric are 4 times that of the conventional fabric, which is equivalent to saving 10 tons of oil and saving energy consumption by 60%. The pmittance of the fabric to ultraviolet light is only 0.06% to 0.14%, the heat insulation effect is obvious, and the energy consumption of the air conditioning is saved, thus playing the role of sunshade and energy saving. After the fabric is used, the waste can be recycled and reused, and the white pollution to the environment is eliminated.

< /p >

< p > at present, Evercolor shading cloth has spread over more than ten provinces and cities and overseas markets such as Beijing, Shanghai, Tianjin, Jiangsu, Kunming, Guangdong, Xiamen, Fujian, Dalian and Shenyang.

< /p >