Original Title: Introduction to Common Detection Items of Disposable protective suit for Medical Use The sudden outbreak of an epidemic in 2020 has deepened people's understanding of protective equipment and protective materials, and masks and protective suit are in great demand as important materials during the epidemic. Many manufacturers keep producing these protective materials overnight. For the front-line medical and nursing work, protection work is particularly important. As a barrier to bacteria and viruses, the quality of protective suit plays a vital role in the safety of medical staff when they directly contact with infectious patients or potential infectious patients. The following is an introduction to the types of protective suit and the detection items of protection. One Introduction to the protective suit Protective suit is a kind of clothing which can protect human body from physical, chemical and biological damage. Can be apply to medical treatment, military use, industry, agriculture, construction, fire fighting, laboratory and that like. Domestic standards for protective suit in China include GB/T 20097-2006 General Requirements for protective suit, GB 24539-2009 General Technical Requirements for Chemical Protective Clothing, GB 24540-2009 Protective Clothing for Acid and Alkali Chemicals. GB/T 29511-2013 Protective Clothing-Chemical protective suit for Solid Particulate Matter, GA 10-2014 Fire Extinguishing protective suit for Firefighters, GA 634-2015 Firefighters' Thermal Insulation protective suit, GB 12014-2019 Protective Clothing-Anti-static Clothing, GB 19082-2009 Technical Requirements for Medical Disposable protective suit, etc. Two Introduction to medical protective suit Medical protective suit can be divided into daily work clothes, surgical gowns, isolation clothes and protective suit according to their use. According to the service life, it can be divided into disposable protective suit and reusable protective suit. According to the material, it can be divided into woven and non-woven protective suit. Daily work clothes usually refer to the white coats worn by medical staff at work. Surgical gown refers to the garment worn in the operating room. Isolation clothing refers to the clothing worn by medical staff on occasions such as contacting patients and family members visiting patients; protective suit mainly refers to the clothing worn by medical first aid personnel, personnel entering infectious disease areas and personnel cleaning and transferring medical waste. Medical disposable protective suit refers to the medical disposable protective suit that provides barrier and protection for medical staff when they work in contact with blood, body fluids, secretions and particulate matter in the air of potentially infectious patients. The compulsory testing items required in GB 19082-2009 Technical Requirements for Medical Disposable protective suit include appearance, liquid barrier (water permeability, moisture permeability, synthetic blood penetration resistance, surface moisture resistance), breaking strength, filtration efficiency, flame retardancy, antistatic property, skin irritation, microbial indicators and ethylene oxide residue. The recommended items are structure, size, elongation at break and electrostatic attenuation performance. It can be seen that the detection of protective suit is mainly assessed from the aspects of barrier, comfort and safety. Three Analysis of common problems in disposable medical protective suit test We will discuss several common problems below,KN95 Face Mask, including appearance identification, electrostatic performance, flame retardant performance, filtration efficiency and liquid barrier performance. 1 Appearance identification problems 1.1 Appearance It is required that the protective suit shall be dry, clean and free of mildew, and the surface shall be free of defects such as adhesion, cracks and holes. At the same time, if the needle sewing processing method is adopted, the needle eye shadow of the needle sewing shall be sealed, and the needle pitch shall be 8-14 needles per 3cm. Parts after processing such as bonding or heat sealing shall be smooth, sealed and free of bubbles. The pull head of the protective suit with the zipper can not be exposed, and the zipper can be self-locked. Expand the full text Common problems protective suit holes caused by sewing or other reasons (Figure 1, Figure 2), there is no sealing strip in the seam, or the sealing strip is not tight. These problems will reduce the protection effect. Harmful blood, body fluids, secretions, particulate matter in the air may invade from these places, causing harm to the wearer. 1.2 Structure In the structural requirements of GB 19082-2009 Technical Requirements for Medical Disposable protective suit, Full Body Disposable Coverall ,Antivirus Disposable Mask with CE Certificate, it is indicated that the protective suit is composed of hooded jacket and trousers. There are many isolation gowns and surgical gowns without hooded structure on the market (Fig. 4), and this standard is also implemented. Then the structure is not consistent. In addition, the structure requires that the cuffs and ankles adopt elastic closing. The face closing and the waist of the hat adopt elastic closing, drawstring closing or hasp. When the user wears the protective suit, the hand, the step and the face of the user are also protected. Wear gloves on the hands, wear shoe covers on the feet, and use corresponding protective masks or masks on the face. Therefore, the closing requirement of the protective suit is more convenient to use the protective products of other parts to avoid the leakage of dangerous factors. If the opening is too large, it is not conducive to the wearing of other protective products and easy to cause leakage. The use of elastic cuffs at the waist is also convenient for movement and comfort when wearing, so as to work. The common unqualified problems are that the waist, cuffs and ankles are not closed. 1.3 Sizes The size and specifications of GB 19082-2009 Technical Requirements for Medical Disposable protective suit are clearly stipulated. Different from the general placement of clothing and other products, according to the size of the product, the production unit has different process sizes. In addition to the prescribed size of disposable medical protective suit, there are clear requirements for the length, chest circumference, sleeve length, cuff and foot opening of each size. See Table 1, Table 2. The reason why the product is unqualified is that the size is too large or too small. ? Exceeded the standard deviation of ± 2 cm. Therefore, the production of protective suit in line with GB 19082-2009 is a unified version, which should be strictly in accordance with the requirements of the standard. 1.4 Identification Product signs and instructions are also common non-conforming items. Because the standard has detailed instructions for the identification and use of the smallest package of protective suit, there are many items, in addition to the identification requirements similar to textile products, there are also some special requirements. Because protective suit belongs to medical materials, it needs medical registration inspection, and the label also needs to be marked with "product registration number". Protective suit are divided into sterilized and non-sterilized products. Sterilized products should have the word "sterilized". GB 19082-2009 is a disposable protective suit, so there should also be the words "disposable" or equivalent. For medical disposable protective suit, the most important thing is the protective function, and the protective effect is directly related to the filter material. If the storage is improper and the time is too long, it may cause aging and change the performance, so the label and instructions are required to mark "production date, storage conditions and validity period". The flame retardancy of protective suit is a recommended item, so it is required to have a description of flame retardancy. In addition, because disposable medical protective suit are worn and used in some high-risk places, the information of "pre-use inspection, usage and recommended use time, precautions" is particularly important. Before use, check whether the disposable protection is not damaged, clean, intact, wear and take off according to the instructions to avoid improper protection or secondary pollution. The information required in the signs and instructions is necessary for consumers to choose, use and handle protective suit. 2 Electrostatic properties Antistatic is also a common unqualified item. Poor antistatic performance of protective suit can cause many problems. The hazards of static electricity are as follows: (1) Dust: static electricity will absorb particles in the air environment on the clothes, destroying the cleanliness of the protective suit; (2) Static electricity will affect the accuracy of some precision electronic equipment; (3) In case of flammable gas, static electricity is also easy to cause fire and security. (4) Static electricity can also make people uncomfortable to wear. During the epidemic period, medical staff wear protective suit for a long time, and the comfort can not be ignored. Static electricity is generated by the contact, friction and separation of two surfaces, and the redistribution of charges. The principle of resistance is divided into two points in principle: (a) spinning static electricity generation, and (B) conducting the generated charge. GB 19082-2009 specifies two electrostatic test methods: antistatic performance (GB/T12703-1991 7.2), which is required to be no more than 0.6 μC/piece, and electrostatic attenuation method (IST40.2 (1)), which is required to be no more than 0.5s. Antistatic performance is whether the fabric is easy to be electrified by friction, and electrostatic attenuation is whether the electricity loaded is easy to be conducted. In addition to the temperature and relative humidity of the environment, the electrostatic properties of fabrics are related to the following factors: (1) Hydrophilicity: Water is a good conductor. The better the hydrophilicity of fiber, the more moisture absorption, the lower the charge, the less likely to produce static electricity; (2) friction conditions: the rougher the surface, the greater the friction coefficient, the more contact points, the easier to produce static electricity. Most of the disposable protective materials are polymer materials such as polypropylene, which have poor water absorption,Medical Full Body Coverall, high specific resistance and easy to produce static electricity. The raw materials can be improved, such as adding conductive fibers, or finishing to increase the water absorption of the fabric. Return to Sohu to see more Responsible Editor:. zjyuan-group.com
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