Original title: Brief Introduction of Medical Disposable protective suit Waterproof Adhesive Strip (Die-cutting House, April 8) medical protective suit, as a kind of anti-chemical clothing, is mainly used for medical staff to wear. The ideal medical protective suit should be multifunctional, not only able to protect medical staff from toxic and harmful liquids, gases or infectious viruses and microorganisms, but also comfortable to wear, with barrier properties, but also breathable, antibacterial and anti-allergenic, not harmful to human health. In addition, the choice of protective suit fabrics should also consider the cost and environmental protection after waste. Requirements to achieve "three refusals and one resistance", that is, water-repellent, blood-repellent, alcohol-repellent and antistatic medical protective suit, are different from general woven materials, using special composite materials, which can be compounded with different materials, such as polyethylene/polypropylene spunbonded non-woven fabrics, with breathable microporous films or other non-woven fabrics, or with spunlaced non-woven. Or the wood pulp is used for compounding the spunlaced nonwoven fabric. At present, the nonwovens used in several medical protective suit being sold and developed in the domestic market are mainly as follows: Polypropylene spunbonded fabric Spunlaced fabric composed of polyester fiber and wood pulp Polypropylene spunbond-meltblown-spunbond composite nonwoven fabric, i.e. SMS or SMMS Polymer-coated fabric Polyethylene breathable film/nonwoven composite cloth TPU moisture permeable film/nonwoven composite fabric Common medical protective suit usually consist of hats, jackets and trousers, which have strict standards in production, including protection (sealing), Virus Prevention Mask 3 Ply with Earloop , clothing, safety and hygiene. Through the cutting, sewing, on the elastic, adhesive tape to produce medical protective suit, involving the process can not be separated from these three: flat seam, overlock, pressure glue. The reason why protective suit can achieve such a high sealing is that it can not be separated from the most important step of pressing glue. Aft that protective suit is sewn by a lathe work, all stitches and pinholes in the protective suit need to be sealed by pressing glue through a heat seal machine so as to prevent dust or liquid from entering from the sewn pinholes and enhance the isolation performance and use safety of the protective suit. As shown in the figure below, the adhesive pressing is to press the heat-sealing adhesive tape at the pinhole position of the protective suit through the heat-sealing machine to ensure the sealing of the pinhole position. The outbreak of the COVID-19 epidemic, KN95 Face Mask with Five Layers , with the spread of the epidemic, the demand for medical supplies around the surge, the most scarce is medical protective suit. During the Spring Festival, the import protective suit and inventory protective suit played an important role, and the follow-up protective suit supply was mainly domestic. The Ministry of Industry and Information Technology takes the following measures: Expand the full text 1. Make greater efforts to increase production and expand capacity; 2. Do a good job of docking supply and demand, and fully guarantee the needs of epidemic prevention and control; 3. Strengthen the control of the whole process of allocation to ensure that key medical supplies are controllable and arrive on time. In view of the shortage of medical protective suit, many garment enterprises have responded to the call of the state to start production of "protective suit", while working overtime to improve production capacity. The official website of the Ministry of Industry and Information Technology also released a proposal for collecting information on layering machines for medical protective suit production on February 9, saying that the output of medical protective suit has increased, but it is still difficult to meet the current demand for epidemic prevention and treatment. Among them, the lack of layering machines (also known as hot air seam sealing machines, stickers, heat sealing machines) and matching heat sealing tapes are the bottlenecks restricting the increase of production and capacity. The popular disposable medical protective suit materials on the market are mainly as follows: The corresponding sealing processes of these materials are also different. Polypropylene non-woven fabrics and SMS non-woven fabrics can be sealed by hot pressing, that is, two layers of fabrics are heated by a hot press and directly bonded together. The hot pressing part will cause the fluctuation of hydrostatic pressure due to the insufficient uniformity of hot pressing. Polyethylene microporous membrane/non-woven fabric shall be sealed by means of heat sealing. The special polyethylene heat-sealing adhesive tape (hereinafter referred to as PE heat-sealing adhesive tape) for polyethylene microporous membrane shall be pressed at the suture position by using a heat-sealing machine to ensure airtightness. The sealing method of TPU film/non-woven fabric is the same as that of polyethylene microporous film/non-woven fabric. Use a heat sealer to press the TPU heat-sealing adhesive tape at the suture position to ensure the airtightness. PE heat sealing rubber strip PE heat sealing adhesive tape shall be used together with polyethylene microporous film/non-woven fabric. The production method of the PE heat sealing adhesive tape is to coat the hot melt adhesive on a special base material, which is mainly divided into polyester + hot melt adhesive, EVA + hot melt adhesive and PE/EVA + heat melt adhesive. The base material is produced first, and then the hot melt adhesive is compounded on the surface of the base material. The polyolefin hot melt adhesive used is also called TPR in the industry. Protective suit sealing strip structure (Source: Jiangmen Yingtong Company) First of all, we need to make fabrics, Quickly Delivery Disposable Protective Clothing , Medical Quickly Delivery Antivirus Coverall , dyeing and finishing, which belongs to the textile industry, and the production speed is greatly limited. At the same time, the melting point of the coated hot melt adhesive is very low at 50-70 deg C, and most of the hot melt adhesive is produced in a scrape coating mode, namely, a base material is produced first, then the hot melt adhesive material is scraped on the surface of the base material after being melted by a solvent, and then is coiled into a coil after being dried; or the hot melt glue material can be cast on the surface of the base material in a casting extrusion mode, and then is coiled into a large coil. Finally, cut the large roll of adhesive tape into small rolls of adhesive tape. Because the production process starts from fiber manufacturing, textile, dyeing and finishing, as well as resin synthesis, processing and coating, the industrial chain is relatively long and the process is complex. Because of the low strength of TPR resin, the basic strength must be provided by the fabric layer, so the fabric and resin are indispensable. There are several drawbacks in the production process of PE heat-sealing adhesive tape. The production process contains solvents, which will pollute the environment. If the solvents are not completely volatilized, there may be residues. The production efficiency of the scraping process is low, about 5m/min, which seriously affects the efficiency. The hot melt adhesive material extruded by casting flows on the base material, and the melting point of the hot melt adhesive material is too low by 50-70 deg C, so that the processing is difficult and the production speed is slow. Because the melting point of the polyethylene material is relatively low (100-120 ℃), the temperature setting of the heat sealing machine is also relatively low, the speed of pressing the adhesive tape will be 5-8 m/min, too fast may scald the polyethylene microporous film, resulting in water leakage, and the processing requires workers with high proficiency and technical requirements. TPU heat sealing adhesive tape TPU heat sealing adhesive tape shall be used together with TPU film/non-woven fabric, because TPU adhesive tape is incompatible with PE film and cannot be bonded. The production of TPU heat-sealing adhesive tape is relatively simple and convenient. It can be completed by using TPU blown film or TPU casting production equipment to produce films, and then cutting them into small rolls. The production speed of one set of TPU film making equipment is about 15m/min (equivalent to 100-120m/min when converted into the width of adhesive tape), which is much faster than that of PE heat-sealing adhesive tape. Moreover, the TPU film production equipment has strong versatility, and the production capacity is not a problem at all. The TPU heat-sealing adhesive strip can be of a two-layer structure, wherein one layer is a high-temperature TPU, which provides excellent barrier property and strength, and the other layer is a low-temperature hot-melt adhesive TPU, which provides excellent welding fastness and bonding speed. Because the tensile strength of TPU is very high, usually up to 30 ~ 50 MPa, which is 5 ~ 6 times higher than that of TPR, so the TPU waterproof strip does not need a plant layer at all, and its strength is enough to meet the requirements of waterproof infiltration and bacteria resistance (the casual clothes and mountaineering clothes on the market at present are all of this structure). Moreover, the TPU industry has been greatly developed in China, from raw material synthesis to various production equipment, the technical level of membrane enterprises is very high, the products have a high cost performance, and also have a very strong competitiveness in the international arena. TPU sealant strip The melting point of the high-temperature TPU film is 150-170 deg C, which is much higher than that of the polyethylene film, and the melting point of the low-temperature hot melt adhesive TPU can be 70-120 deg C, so that the speed of pressing the adhesive tape can reach about 15m/min, the efficiency is greatly improved, and the processing difficulty is relatively low. The national standard "Technical Requirements for Medical Disposable protective suit" GB 19082 2009 stipulates that the hydrostatic pressure at the key parts of the protective suit should not be less than 1. 67 kPa (17 cm H2O). The standard of hydrostatic pressure is actually very low. Many garment customers of our company require that the hydrostatic pressure at the position of the adhesive tape should be more than 30 kPa (300 cm H2O) after the finished clothes are made; The hydrostatic pressure at the slightly higher adhesive tape pressing position is required to be more than 50 kPa (500 cm H2O), which is dozens of times of the hydrostatic pressure requirement specified by the protective suit, and the TPU adhesive tape can easily meet the requirement. As a high-tech enterprise in China, Zhongshan Boruisi New Material Co., Ltd. is the pioneer of TPU film products in China's national industry. It has rich experience in designing and producing all kinds of original films for sealant strips, including single-layer and multi-layer structures, with different temperature ranges and different pressing speeds. The company's medical protective clothing, bacteria-resistant and moisture-permeable film, Medical Disposable Coverall , is used for medical protective suit fabrics with the highest protection level. Can be matched with pure TPU adhesive tape for rapid production. With the deepening of anti-epidemic work, we are pleased to see that more and more protective suit manufacturers begin to use composite TPU film fabrics. The production of corresponding TPU sealing strips is also gradually keeping up. For more industry information, go to the application market to download the die-cutting home APP: return to Sohu to see more Responsible Editor:. zjyuan-group.com
