PPE

Electromagnetic radiation protective clothing is becoming the focus of textile industry

Electromagnetic radiation refers to the phenomenon that electromagnetic wave is emitted or leaked into the air. There are different academic views on the damage of electromagnetic radiation to human body at home and abroad. For the harm of electromagnetic radiation, we have no need to turn pale or ignore its existence

with the rapid development of information technology, the electromagnetic wave transmission properties of textile materials need to be further considered; With the popularization of “people-oriented” concept and the improvement of individual electromagnetic protection requirements, it is more necessary to study the electromagnetic shielding performance of textiles, which are commonly used as human body protection materials, and give consideration to the heat and moisture permeability and comfort of textiles. Therefore, starting from the requirements of electromagnetic compatibility, electromagnetic shielding, electromagnetic stealth, radar reconnaissance camouflage, electronic warfare attack and defense, and considering that under certain conditions, the structure of the material can affect the electromagnetic wave transmission performance more than the physical properties of the material itself, it is urgent to carry out the electromagnetic wave transmission design based on complex structure with the participation of other materials The research on electromagnetism of textiles with special electromagnetic properties provides more scientific content for the research on electrical properties of textiles, and lays a foundation for the development of electromagnetic textiles with special electromagnetic functions

Where can we start to develop electromagnetic radiation protection materials

“the research status of electromagnetic radiation protection materials is to develop new materials with ‘light, soft, thin and wide’, that is, to pursue the structural characteristics of light, flexible, thin wall and wide frequency, and adopt gradient structure to absorb and reflect electromagnetic waves, so as to achieve high shielding effectiveness.” When talking about the future development direction of electromagnetic anti radiation textiles, Zhou Guotai, academician of Chinese Academy of engineering, said

although not any radiation can cause harm to human body, facing the ubiquitous radiation in nature, electromagnetic radiation protective clothing, as one of the important equipment for personal protection, has increasingly become the focus of the textile industry and even the public consumption

what progress has the industry made in the research of shielding materials for electromagnetic radiation protection? 1n this regard, Dr. Shi Meiwu, senior engineer of the Quartermaster Equipment Research 1nstitute of the General Logistics Department, gave us a more detailed introduction: “at present, in addition to stainless steel wire blended fabric, electroless silver plated fabric, electroless copper (nickel) plated fabric, conductive acrylic fabric and multi ion fiber fabric and other electromagnetic radiation protective clothing materials, there are also researchers who have carried out the research of using tin instead of nickel Research on avoiding heavy metals; 1n order to ensure that the electromagnetic wave above a certain frequency will not enter the clothing through the micro holes, the appropriate size and number of micro holes are woven on the synthetic fiber base cloth used for metallization. The final product takes into account the electromagnetic shielding effect and wearing comfort of the electromagnetic radiation protective clothing. Especially when the protective clothing with high shielding effectiveness is needed, because this kind of protective clothing must be made into an electrical sealing structure, it is easy to cause the problems of poor air permeability and comfort. Therefore, the metallization of perforated fabric is conducive to giving consideration to the protection effect and comfort. “

in addition, some researchers have designed skin core structure for metallized substrate synthetic fiber materials. The core layer is conventional polyester, and the outer layer is made into hole masterbatch, mixed with common polyester, and spun into skin core composite filament with composite structure. After alkali deweighting, there are many pits on the fiber surface of the fabric. Metallization is carried out on the uneven fiber surface, and the metal layer is riveted into the pits of the fiber. Because of the riveting effect, the problem of metal layer falling off is avoided, so that the metallized fabric has better durability< According to Zhou Guotai, the formulation of a scientific and reasonable exposure limit is the fundamental basis for distinguishing whether the personnel's environment is basically safe (except for the people with electromagnetic sensitivity), whether the electromagnetic radiation in the working environment needs to be protected, and how much shielding effectiveness of electromagnetic radiation protective clothing should be equipped< Since 1988, six national standards on electromagnetic radiation have been drafted by the Ministry of health, the State Environmental Protection Administration and the Ministry of electronics. 1n view of the problems of long standard age and a bit of confusion in the previous standards, the general equipment department took the lead in merging and unifying seven national military standards related to electromagnetic protection formulated since 1984, including GJB 5313 electromagnetic radiation exposure limits and measurement methods, which considered the concepts of "exposure" and "limit value" and redefined "exposure limit value", The official version was published in 2004 “the two standards of electromagnetic radiation exposure limits and measurement methods are the basic basis of environmental electromagnetic field allowable strength and human exposure limits in China. Although one of the national standards is still in the draft stage, its predecessor is six national standards, so its technical content can still be trusted. 1f there are any uncertain factors, it is just that different management departments may have some differences in the control requirements of exposure limits due to different management perspectives. ” Shi Meiwu believes that the exposure limit value of gjb5313 is moderately strict compared with the previous draft, which can be used as the “upper standard” for shielding effectiveness design of electromagnetic radiation protective clothing< The latest GB / T 23463-2009 "protective clothing microwave radiation protective clothing" standard stipulates that the shielding effectiveness of electromagnetic radiation protective clothing shall be determined according to the exposure limit of gjb5313 and the electromagnetic radiation field strength of the workplace similarly, whether the public needs to wear electromagnetic shielding protective clothing or not depends on the exposure limit under the corresponding frequency and the actual electromagnetic field intensity of the environment< 1n terms of the development trend of electromagnetic radiation protection, the two experts have the following suggestions: first, improve the knowledge level of the public and professionals through science popularization education, so that the public and professionals can have a clear understanding of the concept of electromagnetic radiation, damage mechanism, exposure limit and other concepts, And strictly control the media's exaggerated reports on the harm of electromagnetic radiation the second is to strictly distinguish the basic characteristics of ionizing radiation and non ionizing radiation, and gradually change the term of electromagnetic “radiation” to electromagnetic “exposure” to express that the harm of non ionizing radiation is not as serious as that of ionizing radiation; The effect of human exposure to microwave is similar to that of light wave. 1n fact, the wavelength of electromagnetic wave is longer than that of visible light, so the damage is not great the third is to establish a unified national standard of electromagnetic radiation limits as soon as possible, and formulate the national electromagnetic radiation pollution prevention and control law as soon as possible< The fourth is to formulate scientific and specific product standards and use methods for pollution sources such as induction cooker and microwave oven that are prone to electromagnetic wave leakage and are often used by the public, so as to prevent unqualified products with serious electromagnetic wave leakage from coming into the market, use matching pots and other accessories, and establish reasonable use methods to prevent these products from causing harm to human body fifthly, formulate relevant laws and regulations to formulate strict electromagnetic radiation protective clothing for workers. When the electromagnetic field intensity exceeds the exposure limit in the working environment, it is required to equip electromagnetic radiation protective clothing according to GB / T 23463-2009 “protective clothing microwave radiation protective clothing” build a responsible brand to promote sustainable consumption the new era brings new requirements to the social responsibility work of the industry. 1n 2014, China Textile 1ndustry Federation, focusing on the global economic environment and based on the development situation of the industry, put forward a new proposition for the construction of the social responsibility system of China’s textile and garment industry on the basis of the previous social responsibility work, that is, to create a responsible brand and promote sustainable consumption nowadays, how to fulfill social responsibility and realize sustainable development has become a problem that every industry must consider in the process of development. All along, guiding and encouraging enterprises to fulfill their social responsibilities and promoting the sustainable development of the industry have also been listed as the key work of the industry by China Textile Group in the past decade, under the organization and advocacy of China Textile Federation, the active cooperation of industry enterprises, and the joint efforts and close support of all relevant parties in the industry, the construction of social responsibility in China’s textile and garment industry has won wide recognition at home and abroad, and has opened up a strategic path for the sustainable development of the textile and garment industry China’s textile and garment industry is the first industry in China to advocate the fulfillment of social responsibility and the construction of corporate social responsibility implementation system. 1n 2005, China Textile Federation launched China’s first standardized social responsibility management system CSC9000T, which has been promoted and implemented in more than 300 key textile and garment enterprises, and has won the recognition and cooperation of European BSC1, American SA8000 and other social responsibility standards< in 2008, China Textile Federation launched China’s first social responsibility report compilation guide. So far, more than 60 enterprises have released social responsibility reports on the industry platform, which has caused great repercussions in the international supply chain and domestic policy level in order to promote the industry’s social responsibility experience in a deeper and wider scope, build a joint force for the sustainable development of the industry, respond to the new expectations of consumers and supply chain partners at home and abroad on the industry’s social responsibility work in recent years, and the new requirements of the Federation on the in-depth development of social responsibility construction, 1n early 2014, China Garment Association and China Textile Federation social responsibility office launched the “China garment industry social responsibility collective action project” with the theme of “responsible brand, sustainable consumption”, which received positive response from more than ten brand enterprises and leading enterprises in the industry< 1t is understood that the project was officially launched in March 2014. 1t is divided into three stages, namely, issuing industry initiatives, publishing social responsibility reports by garment enterprises, and improving enterprise management through report evaluation and feedback, which lasted for half a year. By jointly issuing the declaration of collective action on social responsibility of China's clothing industry and participating in the responsibility promotion process of "promoting management through reporting", we can promote the coordinated action of industry enterprises in the field of social responsibility and healthy competition in the performance of responsibility from top to bottom, Strengthen and tap the social responsibility management ability and sustainable development potential of clothing enterprises on March 20, the onshore exchange rate of the US dollar against the RMB closed at 6.2286, a new low of nearly a year, and a 52 week low of 6.2330 appeared during the session. The offshore RMB exchange rate rose above 6.20 on the same day, triggering a number of callable forward contracts to reach the critical point of loss. 1n addition, the strong US dollar against all currencies exacerbated the continued depreciation of RMB in the short term since the central bank implemented the daily trading fluctuation of 2% on the 17th, the exchange rate of US dollar against RMB has appreciated by nearly 1.5% in just four trading days. Analysts said that there is still strong downward pressure on the RMB in the short term, and the sharp depreciation of the RMB is expected to continue to have a certain impact on the commodity market, the real estate market and even the stock market industry insiders pointed out that as the exchange rate of RMB against the US dollar continues to decline, if this trend continues, the export-oriented industry will undoubtedly become more and more competitive

Back to list