Introduction of several military protective clothing performance
1. Body armor
When Lt. John Hickey of TBA Industrial Products Co., Ltd., Rochdale, United Kingdom, presented the paper at the meeting, 76% of casualties in the Vietnam War were caused by fragments of metal flying from a shrapnel explosion and hit by bullets. Only 24%. The vast majority of debris-injured areas are located above the abdomen. The chest cavity accounts for 47%, the head and neck area accounts for 44%, and the other area accounts for 9%. So now this body armor is also called a bulletproof life jacket. A bulletproof life jacket for the casualties in wartime came into being.
Soldiers in the field often need to carry items. The protective clothing designed for them must first consider the weight factor, but also be durable, easy to maintain, and comfortable to wear. The protective clothing worn by the British Army was designed and produced by TBA based on the needs of wartime. Features light (only 3 kg), comfortable and easy to wear. The layered fabric is composed of Kevlar produced by DuPont, Tworon produced by Akzo, and Dyneema made by DSM. Moisture will greatly reduce the degree of ballistic protection, and thus the lifeguard must be waterproof when it is used. This kind of body armor fabric is coated with PVC on both sides. All seams of the clothes are sealed and waterproof. Body armor can protect people from casualties caused by pistols and low-velocity rifle bullets. To deal with high-speed rifles (at an initial speed of 85-100 m/s), ceramic plates are used to protect vital organs.
In addition, pure aromatic polyamides, highly oriented polyethylene, nylon, and high-performance E-glass fibers are also used for ballistic protection, and more and more S-glass fibers and O-glass fibers are also used for such body armor. Highly oriented polyethylene is lighter than aromatic polyamides, has inherently good water resistance, and has a lower melting point than aromatic polyamides.
2, tank service
Tank dress is 95% of Nomex Kevlar synthetic jumpsuit, shirt sleeve cuffs and trousers cuffs are flexible, to prevent the flame from entering the outside world, when the urine can be opened zipper.
The strap-like fabric weaves and rescues the harness to make the upper part of the jumpsuit and the epaulet so that when injured or unconscious, the companion can pull him out of the tank.
3, flame retardant clothing and fire protection clothing
Chemical warfare, chemical warfare, and chemical warfare Flame retardant clothing for soldiers participating in the war is made of modified polypropylene flame-retardant fibers (containing 35 to 85% of acrylonitrile-based copolymers) as warp yarns (70%) and nylon as weft yarns (30 %) of the fabric, the style is a disguised burqa, this burqa with gas masks, rubber gloves, rubber boots.
The air-aviator flame-retardant fabric is fabric of Nomex m-fiber.
Dr. Richard A. Scott, Director of Textile Development Department of Colchester Garment Research & Development Company in the United Kingdom, said that when designing clothing for sea, land and air force personnel, it is necessary to consider protecting people from outdoor fires and weapons. Heat conduction/thermal convection cycle, toxic smoke, etc. Clothing must be flame-retardant, insoluble, with multiple layers of insulation to prevent heat from reaching the skin. Once the personal clothing is melted, the potential heat released when the molten polymer is re-solidified can produce localized deep burns, and the polymer degradants can enter the blood vessels through the broken wound and circulate along with the blood, which is difficult to treat. Therefore, soldiers’ clothing should be fireproof, heat-proof, and convection-proof. For example, the No. 8 ship's action work clothes is a typical example: the work clothes's fabric is made of 75% Pruban cotton and poly-blend fabric, which has flame-retardant and infusible functions. Each person working in the emergency standby area of ​​the ship, each wearing a pair of flame-retardant cotton white romper overalls, a white flame-retardant cotton flame resistant hood and similar flame resistant gloves, is outside the 8th overalls.
Neil Savaver, director of production and sales at Universal Carbon Fibers, spoke about the need to consider factors such as oxygen-limiting index, maximum temperature, thermal conductivity, smoke emission, calorific value, flame distortion, carbon toughness, and carbon strength when producing fire-resistant fabrics. Afterburner and waste heat, toxic gas emission, heat release and other factors, no single fiber can meet all the requirements for flame retardance. Six fiber blended fabrics can meet the standards required for aesthetic and performance balance. The company has developed a new sole material that retains the necessary friction properties despite the gradual scorching of the new material in the PIPe:Alpha disaster. When the flame is strung out of or near the flame, the fabric of the fire-retardant suit is a metal-coated fabric - a fabric coated with aluminum powder or stainless steel powder with poor reflectivity.
As for the submarine sailor's flame-retardant clothing, there are more stringent requirements in terms of free-ironing, quick-drying, low smoke, and toxic fumes emission. Their shirt/pants fabric is Nomex Fiber (95% Nomex and 5% Kevlar).
4, anti-bad weather service
David Brook, a textiles department at Leeds University, said that the weather-resistant clothes should be both waterproof and breathable, and should be kept warm and heat-dissipated. The fabrics are mostly composite materials. Feather-like fillers have the highest bulkiness in the dry state, and the heat insulation function is the best. Weiwei Buxke proposed that such protective clothing should be thoroughly tested in the field to identify all its properties whenever possible. The polymer coating breaks at low temperatures and delamination of composites occurs at extremely low spilt (this phenomenon occurs in the South Pole, the Arctic), these will greatly undermine the performance of the protective clothing, for the coated fabric. Static pressure head test also used sohildkneoht tester. As for the adiabatic test, a thermal imaging camera can be used to test which part of the garment design has lost heat, and the fabric is tested for breathability (transmission of water vapor). Hydrophilic polycarbophilic vinegar coating has better breathability than other fabric sheets. When other fabrics stop sending moisture in the wet condition, the surface water polyacrylonitrile formic coating can continue to transmit water vapor. This type of protective clothing must take into account the bad waterproof weather performance at the joints and pockets.
5, submarine sailor anti-impregnated clothing
When talking about the escape of submarine sailors, the commander of third-generation submarine sailor D.B. Paddy Ryan pointed out that it is possible to escape by wearing anti-submersible suits with a breathing system and head pockets in the depth of 180 meters. Carbon dioxide as a medium with poor heat transfer into the headwater system can insulate the hotspot and disperse it. Once the evacuee arrives at the water, it can resist hypothermia and marine diseases.
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The thawing machine is used to thaw frozen meat or frozen food at -18 degrees. Put the frozen meat (block) and other materials into the thawing tank filled with water. The frozen meat thawing machine is mainly used in meat, poultry, seafood, fruit, egg, and fruit processing plants. The thawing machine is used to thaw frozen meat or frozen food at -18 degrees.
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