Four Ways To Improve Fabric Sunscreen Performance

< p > as the temperature continues to rise, the sun is scorching the sun, and the ultraviolet radiation becomes stronger.

All kinds of sunscreen methods have become the focus of attention. Apart from sun care products, sunshade, sunshade and sunscreen clothing made by < a target= "_blank" href= "http://www.91se91.com/" > textile > /a "become a good helper for sun protection.

What are these sunscreen products? Are they really effective? What are the standards for sunscreen products in various countries? This time we present the methods, standards and representative businesses for sunscreen on fabrics.

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< p > < strong > expert opinion < /strong > /p >

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

Deng Hua, Professor of textile School of Tianjin University of Technology, said in an interview with reporters that ultraviolet radiation on the fabric was partly reflected, partly absorbed and partly through the fabric. If the latter situation can be reduced, the harm of ultraviolet radiation to human body will be reduced. P

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

< p > fabric coverage factor, fiber 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.

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< 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.

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< p > how to improve the UV protection properties of textiles? There are basically four ways: first, direct selection of fibers with better 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 the fabric; 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 UV coating finishing on fabrics.

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< 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".

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

< p > < strong > difference of global standard < /strong > < /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.

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< p > < strong > national standard introduction < /strong > < /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.

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< p > European standard.

The European standard for UV protection of textiles consists of two parts: testing and grading labels.

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.

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< 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.

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< 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.

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< 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.

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< 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.

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