1, Honeywell Honeywell
Honeywell was founded in 1885, entered China in 1935, its four major business groups have been settled in China, in more than 20 cities in China has more than 50 wholly owned companies and joint ventures. Honeywell's Safety and Productivity Solutions Group provides mobile industrial computers, voice software and workflow, barcode scanners, printing solutions, gas detection technology and personal protective equipment to more than 500 million workers worldwide.
2, MSA Messian
Messian was founded in 1914 in the U.S., is a century-old security equipment and program suppliers, the formation of the head, body protection, firefighting equipment, gas monitoring instrumentation, involving all categories of protection of a huge product system. Mason entered China in 1987, providing research and development, production, training in one of the safety protection of the overall solution.
3, Dr_ger Dr_ger
Created in 1889, Germany's leading manufacturer of safety equipment, specializing in gas monitoring in the respiratory protection products, research and development, production and sales services. Dr?ger has sales and service organizations in many countries around the world, with R&D and production facilities located in Germany, the UK, Sweden, South Africa, the US, and China, etc. Dr?ger is currently focused on providing users with comprehensive medical equipment and complete hazard management solutions, which are highly recognized and favored by the global market.
4, ZHEAN ZHEAN
ZHEAN Group was founded in 2000, is a professional research and development, design, production and sales of fire equipment and fire equipment enterprises. The company has advanced production equipment, perfect inspection and testing equipment, and mainly produces fire extinguishers, self-rescue breathing apparatus, escape descender, comprehensive gas masks, fire blankets and other fire fighting equipment. At present, our products are sold all over the country and exported to overseas.
5, Zhejiang Yuan
Yuan is focused on firefighters protective equipment, intelligent communication equipment, rescue and demolition equipment, personal self-rescue and escape equipment, such as product research and development, production and sales of science and technology-based technology enterprises. The company has obtained more than a hundred patents, is the third batch of national emergency industry demonstration base core enterprises. The company mainly produces air breathing apparatus, firefighter's protective clothing, fire helmets, fire safety rope, escape descender, fire blanket, fire pumps and other products.
6, YouAn Technology
YouAn Technology is a collection of fire products research and development, production, sales and service in one of the modern enterprise, the main smoke masks, escape descender, fire extinguishers, emergency lighting, escape rope, fire blanket, air breathing apparatus and other products. The company has dozens of R & D achievements with independent intellectual property rights, has passed the ISO9001: 2008 international standard quality system certification, SGS environmental certification, CE certification.
7, Anoxit
Anoxit is a high-end manufacturing enterprise integrating R & D, production and sales, which mainly provides a series of innovative products and services in the field of emergency escape and fire rescue. The company has a variety of domestic advanced R & D testing, testing, inspection equipment, has now obtained dozens of patents. The products cover self-rescue respirator, positive pressure oxygen respirator, emergency bag, emergency box, fire blanket and other series.
8, Kai An brand
Built in 1988, the former Guangdong Coal Mine Safety Instrument Factory, the early production of filtering fire self-rescue respirator manufacturers, production, including fire self-rescuer/escape descender/escape rope/fire extinguishing blankets, etc., Guangzhou Kai An Fire Science and Technology Co. 9, Dong'an Fire DA
Dong'an Fire is a collection of research and development, manufacturing, sales as one, specializing in the production of various types of fire protective clothing, personal protective equipment, self-rescue respirator, life-saving equipment, fire-fighting equipment, and other products of a large enterprise. The company's products are made with exquisite craftsmanship and complete testing equipment, and are widely used in fire rescue, petroleum, chemical, electric power, mining and other industries. Our products are sold to all major cities in China and overseas.
Expanded knowledge: mask body
Mask body is the main component of the gas mask parts constitute a whole. At first glance, it is just a piece of rubber, nothing much to learn. However, it should be suitable for a variety of head shape people wear, not only to close, do not let the poisonous material to take advantage of the gap, but also not to the people caused by facial pressure pain, it is not an easy task. Mask designers have been racking their brains over just the part of the mask that fits the face, known to experts as the fit frame.
In the beginning, the frame was made of a single piece of rubber, called a monolithic frame. It can be kissed with the face, structure and manufacturing process is very simple, but wear often make the prominent parts of the face feel unbearable pressure and pain, dynamic airtightness is also poor.
Later, the emergence of a single reverse folding edge of the frame structure. It is in the plane on the basis of the closed frame and then add a circle of folded edge, relying on the elasticity of the rubber tension in the human face to form a closed force. When exhaling, the pressure inside the mask is greater than the outside pressure, which is a positive pressure airtight frame structure. The single reverse folded edge hermetic frame is undoubtedly a big step forward than the single piece hermetic frame, however, there is still a big gap in meeting the requirements of tactical use. Some of the more advanced hermetic frames are the air cushion tube type, the double reverse folded edge type and the corrugated structure type.
The British S6 mask is now internationally recognized as an advanced mask, its most notable feature is the use of air cushion tube closed frame structure. This closed frame consists of a center filled with a certain amount of gas and sealed up the composition of the rubber tube. The tube is equipped with a pressure regulating valve, which can make the air cushion tube become "bulging" some or "deflated" some, so that it can be closely matched with a variety of facial type of personnel face. Because the gas in the air cushion tube exerts equal pressure in all directions, therefore, it produces balanced pressure in the human face and does not produce localized pressure pain when worn for a long time. However, the production process of this close-fitting frame is complicated, and the product qualification rate is low.
The latest development of the British S10-type mask is the use of the whole molding class double folded edge of the closed frame. It is a closed frame with two folded edges, can form two seals in the human face, even if a small amount of toxic agent break through the first "line of defense", the second "line of defense" can also block the further intrusion of toxic agents.
Corrugated close frame structure is also said to be a two-way line close structure. The latest M40 series of masks developed by the United States uses the corrugated structure.
The above is what I have shared today, I hope it can help you.