Electromagnetic radiation protective clothing increasingly becomes the focus of the textile industry

Electromagnetic radiation is the phenomenon in which electromagnetic waves are emitted or leaked into the air. With regard to the problem of electromagnetic radiation damage to the human body, there are different academic views at home and abroad. With regard to the dangers of electromagnetic radiation, we do not need to talk about discoloration or disregard its existence.

With the rapid development of information technology, textile materials need to further consider the electromagnetic wave transmission performance; with the popularization of the “people-oriented” concept and the improvement of individual electromagnetic protection requirements, textiles, which are commonly used human body guard materials, need to study electromagnetic shielding performance and take into account The thermal and moisture permeability and comfort of textiles. Therefore, starting from the requirements of electromagnetic compatibility, electromagnetic shielding, electromagnetic stealth, radar reconnaissance and camouflage, and electronic warfare attack and defense, considering that the structure of the material under certain conditions can affect the transmission performance of electromagnetic waves more than the physical properties of the material, it is urgently needed. Conducting electromagnetic research on textiles with special electromagnetic properties based on complex structures and with the participation of other materials, providing richer scientific content for textile electrical performance research, and laying the foundation for the development of electromagnetic textiles with special electromagnetic functions.

Where do you start developing electromagnetic radiation protection materials?

“The research status of electromagnetic radiation protection materials is devoted to the development of new materials that are 'light, soft, thin, and wide', that is, pursuing lightweight, flexible, thin-walled, and broadband structural features, and adopting a gradient structure to absorb and reflect electromagnetic waves. To achieve high shielding effectiveness.” When talking about the future direction of electromagnetic radiation protection textiles, academician of the Chinese Academy of Engineering Zhou Guotai said.

Although not all radiation can cause harm to the human body, in the face of ubiquitous radiation in the natural world, electromagnetic radiation protective clothing, one of the important equipments for individual protection, has increasingly become the focus of attention in the textile industry and even the mass consumer.

At present, what progress has the industry made in the research of electromagnetic radiation shielding and shielding materials? In this regard, Dr. Shi Wei, senior engineer of the Military Equipment Research Institute of the General Logistics Department, gave us a more detailed introduction: “At present, in addition to stainless steel wire blended fabrics, electroless silver plating fabrics, electroless copper (nickel) fabrics, conductive acrylic fabrics In addition to electromagnetic radiation protective clothing materials such as multi-ion fiber fabrics, researchers have also conducted research on the use of tin instead of nickel to avoid heavy metals, and weave appropriate dimensions and the appropriate number of microfibers on synthetic fiber base fabrics used as metallization treatments. The hole ensures that electromagnetic waves above a certain frequency do not enter the garment through the micropores, and the final product takes into account the electromagnetic shielding effectiveness and wearing comfort of the electromagnetic radiation protection suit, especially when high shielding effectiveness is required. In the case of protective clothing, because such protective clothing must be made into an electrical seal structure, it is likely to cause problems of poor air permeability and comfort. Therefore, the use of porous fabric metallization treatment is conducive to both protection and comfort.”

In addition, researchers have designed skin-core structures for raw materials for fabrics that are used for metallization. The core layer is a conventional polyester, and the skin masterbatch made of skin is blended with ordinary polyester and spun into a composite sheath core filament. After alkali reduction treatment, there are many pits on the fabric surface of the fabric. The metallization process is carried out on the uneven fiber surface. In the metal layer riveted to the fiber pits, the metal layer is prevented from falling off due to the riveting effect. The problem is that this metalized fabric has better durability.

Standards need to be improved

Zhou Guotai stated that formulating a scientific and reasonable exposure limit is to distinguish whether the environment in which people are located is basically safe (excluding electromagnetically sensitive people), whether electromagnetic radiation in the working environment needs protection, and how much electromagnetic shielding protective clothing should be equipped with shielding effectiveness. Fundamental basis.

Since 1988, the Ministry of Health, the National Environmental Protection Agency, and the Ministry of Electronics have drafted six national standards for electromagnetic radiation. In response to the problem of the relatively long ageing and content confusion of the previous standard, the General Armament Department took the lead in merging seven national military standards related to electromagnetic protection that had been established since 1984, in which “exposure” and “limits” were taken into account. "The concept and redefining the "exposed limit" of the GJB 5313 "electromagnetic radiation exposure limits and measurement methods" standard, and in 2004 introduced a formal version.

"The two "Electromagnetic Radiation Exposure Limits and Measurement Methods", respectively, which were merged and unified, are the basic basis for China's environmental electromagnetic field allowable intensity and human exposure limits. Although one of them is a national standard, it remains at the stage of the draft However, its predecessor is the six national standards, so its technical content can still be trusted. If it is still said that there are uncertain factors, it is just that different management departments are standing on different management perspectives and may be required to control exposure limits. There will be some differences.” Shi Yong believes that the exposure limit value of GJB5313 is moderately stricter than the previous exposure draft, and can be used as a “superior standard” for designing shielding effectiveness of electromagnetic radiation protective clothing.

The newly-developed GB/T 23463-2009 "protective clothing microwave radiation protective clothing" standard stipulates that the shielding effectiveness of electromagnetic radiation protective clothing shall be determined in accordance with the exposure limits of GJB5313 and the field strength of electromagnetic radiation in the workplace.

Similarly, whether the public needs to wear electromagnetic shielding protective clothing, as long as the conclusions are based on the exposure limit of the corresponding frequency and the actual electromagnetic field strength of the environment proposed by the standard.

Clear concept awareness

With regard to the development trend of electromagnetic radiation protection, the two experts have the following suggestions: First, to increase the knowledge level of the public and professionals through science education, so that the public and professionals have the concept of electromagnetic radiation, the damage mechanism, Concepts such as exposure limits have a clear understanding, and strictly control the media's exaggerated reports of electromagnetic radiation hazards.

The second is to strictly distinguish the basic characteristics of ionizing radiation and non-ionizing radiation, and gradually change the term “electromagnetic radiation” to electromagnetic “exposure” to express that for non-ionizing radiation, the harm is not as serious as ionizing radiation; the human body is exposed to microwaves. The effect is similar to exposure to light waves. In fact, the wavelength of electromagnetic waves is longer than visible light and the damage is not so great.

The third is to establish a unified national standard for electromagnetic radiation limits as soon as possible and to formulate a national law on prevention and control of electromagnetic radiation pollution as soon as possible.

The fourth is the establishment of scientific and specific product standards and methods of use for pollution sources that are prone to leakage of electromagnetic waves and often used by the public, such as induction cookers and microwave ovens, to prevent the listing of substandard products with severe electromagnetic wave leakage, and to use accessories such as pots and accessories with good compatibility. Reasonable use of methods to prevent these products from harming the human body.

Fifth, formulate relevant laws and regulations, formulate strict electromagnetic radiation protective clothing provision regulations for workers, and exceed the exposure limit electromagnetic field intensity in the work environment, in accordance with GB/T 23463-2009 "protective clothing microwave radiation protective clothing" standard The provisions of the mandatory electromagnetic radiation protective clothing.

Build responsible brands to promote sustainable consumption.

The new era has brought new demands to the industry's social responsibility work. In 2014, the China National Textile and Apparel Council focused on the global economic environment and based on the development of the industry. Based on the previous work on social responsibility, the China Textile Industry Federation proposed a new proposition to the construction of the social responsibility system for the Chinese textile and garment industry – to build a responsible brand and promote Sustainable consumption.

Nowadays, how to fulfill social responsibilities and achieve sustainable development are issues that every industry must consider in the development process. For a long time, guiding and encouraging enterprises to fulfill their social responsibilities and boosting their industries to achieve sustainable development have also been listed as key industries in the industry.

In the past ten years, under the organization and advocacy of China Textile Association, with the active cooperation of industry and enterprises, with the joint efforts and close support of the relevant parties in the industry, the social responsibility construction of China's textile and garment industry has won domestic and international It has been widely recognized and has opened up a strategic path for the sustainable development of the textile and apparel industry.

China's textile and garment industry is the first industry in China that advocates fulfilling social responsibilities and building a corporate social responsibility implementation system. In 2005, China Textile Association launched China's first standardized social responsibility management system, csc9000t. At present, it has promoted and implemented more than 300 key textile and garment enterprises, and has obtained approval from social responsibility standards including bsci in Europe and sa8000 in the United States. cooperate with.

In 2008, China Textile also launched China's first social responsibility report preparation guideline. To date, more than 60 companies have issued social responsibility reports on industry platforms, which has caused great repercussions at the international supply chain and domestic policy level.

In order to promote the industry’s social responsibility experience in a deeper and broader context, build a collaborative force for the sustainable development of the industry, respond to the new expectations of domestic and foreign consumers and supply chain partners for the industry’s social responsibility work, and the Federation’s further development In response to the new requirements for social responsibility building, the China Garment Association and China Textile Association’s Social Responsibility Office launched the “China Apparel Industry Social Responsibility Collective Action Project” with the theme of “Responsible Brand, Sustainable Consumption” in early 2014, and received more than ten The positive response of various brand enterprises and leading enterprises in the home industry.

It is understood that the project was formally launched in March 2014. It was divided into three phases, namely the issuance of industry advocacy, the release of social responsibility reports by apparel companies, and the evaluation of reports and feedback on the management of enterprises, which lasted six months. Through the joint publication of the “China Declaration on the Social Responsibility of the Garment Industry in Collective Action” and the collective participation in the process of “recruiting with the report” responsibility improvement process, we will integrate the actions from the top to the bottom and promote the coordinated actions and accountability of the industry companies in the field of social responsibility. Virtuous competition in performance, strengthen and tap the social responsibility management capabilities and sustainable development potential of garment enterprises.
On the 20th of March, the US dollar exchange rate against the Chinese yuan on the shore closed at 6.2286, hitting a new low of nearly a year, with an intraday low of 52 weeks at 6.2330. The exchange rate of offshore RMB surpassed the 6.20 mark on the same day, triggering a number of redeemable forward contracts to reach the critical point of loss, plus the strength of the US dollar against all currencies, exacerbating the continued devaluation of the RMB in the short term.

Since the central bank implemented a 2% daily trading volatility on the 17th, the exchange rate of USD against RMB has risen by nearly 1.5% in just 4 trading days. Analysts said that there is still strong downward pressure on the renminbi in the short term. This round of rapid devaluation of the renminbi is expected to continue to have a certain impact on commodity prices, real estate market and even the stock market and other asset prices denominated in RMB.

According to industry insiders, as the exchange rate of the renminbi against the US dollar continues to decline, if this trend continues, the export-oriented industry will undoubtedly benefit significantly, including textile and clothing, toys, shoes and hats.

According to Guo Liang, Sichuan Textiles Import and Export Corporation, many export-oriented textile companies have been struggling to survive last year. "Now that the dollar has appreciated, the dollar-denominated list will benefit." "With the devaluation of the yuan, you can finally breathe!" Speaking.

"Each RMB is depreciated by 1 point and exports of 1 million US dollars can make a profit of 10,000 yuan during settlement." Li Hong, vice president of "West China Energy" Industrial Co., Ltd., expressed the same view. "The devaluation of the renminbi will definitely benefit exporting enterprises. However, it will be difficult to judge how long the depreciation of the currency will last and whether it will rise again in the future."

According to industry insiders, from the industry point of view, the foreign trade export-oriented industry in the A-share market will undoubtedly benefit from the devaluation of the renminbi, of which textile and clothing, toys, shoes and hats will be the biggest beneficiaries. The textile and apparel industry is highly dependent on exports. The devaluation of the renminbi on the one hand will help the company reduce costs and improve the competitiveness of its products. The enterprises will get more orders, on the other hand, it will help export-oriented enterprises obtain exchange gains.

Judging from the specific companies in the A-share market, many companies in the textile and apparel industry rely mainly on overseas sales. Among them, the major markets for the Vosges shares, which are mainly sales of towel products, are also overseas. The 2013 semi-annual report shows that overseas sales accounted for 69.65% of revenue. The company's products are sold to more than a dozen countries and regions such as Japan, the United States, Europe, etc. Since 1999, the company's export volume and export value have been ranked first in the same industry; Lu Tai A is the leading product for the shirts with yarn-dyed fabrics and Shirts and other products. 85% of the company's products are sold to more than 30 countries and regions including Japan, the United States, the United Kingdom, Italy, and New Zealand. In addition, companies that may benefit include Shanshan, Youngor and Red Bean.

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