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• Создано: 11-05-22
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qiaosenmachinery.com

Описание: qiaosenmachinery.com Punching machines are developed for high flexibility and efficient metal processing. Normally, the punching equipment consists of two pieces of tool: one for the punches and another for the dies.What is the punching machine?These machines are usually equipped with a linear matrix carrier (tool holders) and quick change tools. The numerical computerized punching (CNC) is a manufacturing process of sheet metal that is made by CNC punching machines. These machines can be a single head design and tool rail or turret design of multiple tools. How does punching machines work?A punching machine works like a paper drill. The punch presses the paper against the drilling stand and finally into a round opening. Scrap metal from the perforation accumulates in the drilling container. The punching works in exactly the same way: the sheet is placed between the punch and the matrix. The work pieces are programmed and the lengths of the bars are entered, the control automatically calculates the maximum number of pieces to be punched (for example, 18 pieces of a 6000 mm bar). Once the desired number of work pieces is entered, the bar is pushed towards the stop. The punching machine is completely automated once the production process starts. Then the third axis of the CNC (CNC is the abbreviation of Computer Numerically Controlled) always moves the cylinder exactly on the tool, which minimizes the wear of the bearings and tools. All the pieces are sent by a slat conveyor and pushed laterally on a table. Any scrap is carried to the end of the conveyor and dropped into a containerThere are many different types, makes and models of hand-held punching machine, and each one may be more suited for use on a particular material or specific task. There are basic hand-held punching machines available such as punching pliers. They typically have steel arms and jaws with soft-grip rubber handles and a heat-treated hardened steel punch that is screwed in to its uppermost jaw and held tightly in place with a nut. Spare punches of various sizes and shapes are available. Rotary punch pliers have steel arms and jaws, the upper jaw having a rotating steel drum with six punches of increasing sizes attached to it. The typical sizes include: 2, 2.5, 3.0, 3.5, 4 and 5mm. (5/64, 3/32, 7/64, 1/8, 5/32 and 3/16 in) though these may differ from model to model.There are many types of industrial hand-held punching machines available. Though their chief function remains the same (to punch holes) each may have qualities that make them better suited to a specific material or task. They are generally considered more heavy-duty tools than their domestic counterparts. Pressed steel punching machinesThere are punching machines that have pressed steel bodies, soft-grip rubber handles, a depth gauge and a selection of interchangeable hardened steel punches and dies of varying sizes. These types of punching machine are typically more expensive than the forged steel varieties. What's more, there are also many punching machine with more specific usages such as C Frame Single Point Metal Stamping Machine, C Frame Double Point Metal Stamping Machine, H Frame Single Point Punching Machine, H Frame Double Point Punching Machine, Deep Throat Punching Machine, Servo Punching Machine, Coil Feeder Machine, NC Servo Feeder Machine, YTE Electronic Disk Feeder, etc. 

Дата Публикации: 11-05-22

opticalplcsplitter.com

Описание: opticalplcsplitter.com Passive optical networks are characterized by the "splitting" of the optical fiber one or more times in the field, resulting in the sharing of the optical fiber amongst multiple users. The fiber in a PON is typically shared with 16 to 32 users. Hence the bandwidth of the fiber originating at the CO/HE is shared among a group of users. The splitting of the network is accomplished by an optical splitter. These Optical Fiber Splitters can split the fiber 2 to 32 times and, by their nature, introduce inherently high losses in the network. Therefore, their use is limited due to the power budget consideration of the network. The splitter has a great effect of increasing network reliability. A single 1 x 32 splitter has less loss than 1 x 2 and 1 x 16 or 1 x 4 fiber splitter and 1 x8 cascaded splitters or any combination of 1 x 16 or fiber splitter 1 x 4 and 1 x8 cascaded splitters in the network. With the evolution of optical networks, the need for multiple distributions of optical signals is crucial. For this application TELNET, S.A. offers its range of single mode and multimode fiber splitter. These couplers or splitters are used to split the input signal into N output branches with minimum loss.Functions of various fiber optic splitter types are different.PLC splitter PLC splitter is one of fiber optic splitter types, and just its full name is planar lightwave circuit splitter, and it is made of silica optical waveguide technology. It has a good channel to channel uniformity, high reliability and small size which ranges of wide operating wavelength. and is widely used in PON networks to realize optical signal power management. And We Fiberstore provide a series of 1 x N and 2 x N splitters that all meet GR-1209-CORE and GR-1221-CORE and are certified by TLC for network development. A fiber fused coupler is one of the most popular passive components for wavelength multi/demultiplexing or branching/combining of optical signal. They are used to split optical signals between two fibers, or to combine optical signals from two fibers into one fiber. Fused couplers do suffer from some disadvantage. Multimode fused couplers are mode dependent. Single fused couplers only transmit one mode, so they do not suffer from mode dependency. However, they are highly wavelength dependent. A difference in wavelength of which the fused fiber coupler will be used. FS fused fiber couplers are available in a range of wavelengths, fiber sizes, and splitting ratios. Standards configurations are one by two and two by two couplers. N by M couplers, such as one by three, or one by four and so on are also available on request. As for another passive optical splitter, FTTH splitter, these couplers/splitters are very often used in CATV networks. The Plastic splitter box is used for fiber cable and fiber communication equipment connection. It has redundant space for pigtails and adapters after up to 48 fusion splicing. FTTH splitter is suitable for the ABS or LGX packed splitters to protect the connection between fiber cable and pigtails, and mainly for FTTH projects to be wall mount or rack mount fiber splitter, which is realizing the function of fiber splitter, splicing, distribution and FTTH cable configuration. This kind of splitter always used together with a FTTH Box Except for these three types, there are some other splitters like FBT Splitter. For sure, a splitter is often equipped with a Optical Splitter Box. To work normally, the Terminal Boxes are also indispensable. Optical Fiber Terminal Box and Fiber Distribution Box may need a Optical Fast Connector or Optical Quick Connector for great effect as well. 

Дата Публикации: 11-05-22

misuxin-en.com

Описание: misuxin-en.com What are integrated circuits? An integrated circuit (IC), sometimes called a Chip, microchip or microelectronic circuit, is a semiconductor wafer on which thousands or millions of tiny resistors, capacitors, diodes and transistors are fabricated. An IC can function as an amplifier, oscillator, timer, counter, logic gate, computer memory, microcontroller or microprocessor.An IC is the fundamental building block of all modern electronic devices. As the name suggests, it's an integrated system of multiple miniaturized and interconnected components embedded into a thin substrate of semiconductor material (usually silicon crystal). A single IC or Single Chip could contain thousands or millions of transistors, resistors, capacitors and diodes.Additional components may also reside on it, all interconnected through a complex web of semiconductor wafers, silicon, copper and other materials. Size-wise, each component is small, usually microscopic. The resulting circuit, a monolithic chip, is also tiny -- often just enough to occupy a few square millimeters or centimeters of space. One common example of a modern-day IC is the computer processor, which typically contains millions or billions of transistors, capacitors, logic gates, etc., connected together to form a complex digital circuit. Although the processor is an IC, not all ICs are processors. Except for ICs like supervisor and reset ICs, some other device like Programmable Logic Device, DC DC Power Chip, Linear and LOD Regulators, Amplifier and so on are needed for a electronics. Among all these, you may also need a great amplifier for sure. What Is an Amplifier? An electronic amplifier is a device that is used to increase the power, current, or voltage of a signal. Amplifiers are used in music equipment, electronic devices such as television and radio receivers, audio equipment, and computers to increase the amplitude of a signal.>How Does an Amplifier Work? Amplifiers work by increasing a small input signal to deliver a larger output signal. Amps in audio equipment take tiny electrical signals that contain musical frequencies and amplitudes and increase their strength. When talking about power amps, this increases the power enough to drive speakers back and forth to generate air pressure variations, also called waves. It does this by taking power from a power supply and increasing the output to match the (relatively low-power) input signal. This process invariably introduces some noise and distortion into the signal; and the process cannot be 100% efficient at increasing the gain without loss — amplifiers inherently will lose some energy in the form of heat. The ideal amplifier can be described as "a straight wire with gain," as the output would be identical to the input, just greater. There are many types of amplifiers in the market, such as comparators amplifier, precision op amp, operational amplifiers, etc. 

Дата Публикации: 11-05-22

mednovahz.com

Описание: mednovahz.com With the development of the modern technology and medicine, many advanced equipments came into being. ERCP Instruments are one of them. Endoscopic retrograde cholangiopancreatography (ERCP) is a combined endoscopic and fluoroscopic procedure in which an upper endoscope is led into a second part of the duodenum, making it possible for passage of other tools via the major duodenal papilla into the biliary and pancreatic ducts. Contrast material may be injected in these ducts, allowing for radiologic visualization and therapeutic interventions when indicated. ERCP initially started as a diagnostic procedure through cannulation of the pancreatic and biliary ducts but has evolved over the years to a predominantly therapeutic tool. Difficult biliary cannulation is proposed to be defined as cannulation attempts duration of more than 5 minutes, more than five cannulation attempts, or at least two pancreatic guidewire passages. Direct visualization of the ducts is done through cholangiopancreatoscopy. The side-viewing duodenoscope is considered the standard for ERCP procedure as it allows a better view of the major duodenal papilla, rendering cannulation easier. In patients with reconstructed gastrointestinal anatomy, as in patients with Billroth II gastrectomy or Roux-en-Y operation, the afferent loop entrance is hidden, and at a sharp angle, the afferent loop is elongated, and the papillary position is reversed. In these situations, the traditional side-viewing endoscope provides a limited visual field and makes afferent loop intubation challenging, thus increasing the risk for intestinal injuries. A forward-viewing endoscope may be a reasonable alternative in these circumstances, where afferent loop intubation would be easier, but papillary cannulation would be more challenging. The reversed papillary position makes it difficult for both side-viewing and forward-viewing endoscopes. The double-balloon enteroscopy technique uses two balloons to advance the forward-viewing endoscope through the intestine by alternating inflating and deflating balloons. The dual lumen forward-viewing endoscope would allow the use of other surgical tools as an Allis forceps to hold the papilla, and using a stiffer endoscope with manual compression or instruments like polypectomy snare may be considered to make cannulation easier. In medicine and surgery, the branch that deals with the digestive system and its disorders is called gastroenterology. Gastroenterology focuses on the diseases affecting the gastrointestinal system, which includes all organs between the mouth and the anus along the alimentary canal. Gastroenterology does study on normal functions and diseases of the gastrointestinal system: esophagus, stomach, small intestine, colon and rectum, pancreas, gallbladder, bile ducts and liver. Gastroenterology also includes other organs that participate in digestion such as the liver, gallbladder, pancreas as well as the vermiform appendix. Reliable first class gastroenterology instruments helps gastroenterologists to diagnose properly diseases of these organs. Given the complex anatomy of the gastrointestinal system, specialized equipment and trainning are needed for assessment, diagnosis and treatment of gastrointestinal diseases. We can offer a variety of devices and tools that are used in gastroenterology such as gastroscopes, duodenoscopes, proctoscopes, capsule endoscopes, insufflation needles, bite blocks, gastric bands, hernia prostheses, ileostomy bags, ozone therapy units, etc. Gastroenterology involves the overall understanding of the normal gastrointestinal organs action. Gastroenterologists have to understand motility - the movement of material through the stomach and intestine, the digestion and absorption of nutrients and the function of the liver. There are many other diagnosis instruments used for medicine such as EMR and esd instruments, urology instruments equipped with endoscopic equipments like hemostasis clip, endoscopic accessories and so on. 

Дата Публикации: 11-05-22

ifansolution.com

Описание: ifansolution.com Pipes are defined as circular tubular products used for conveying fluids (liquids, gases, and fluidized solids). Pipes are designed for a particular design pressure corresponding to design temperature. Various parameters related to pipes are Pipe Size, Pipe Schedule or thickness, Pipe Material, Pressure withstanding capability, Temperature withstanding capability, etc. Different types of pipes are used in the industrial sector for different purposes. Common industries that find extensive use of pipes are oil and gas, process industries, chemical and petrochemical complexes, food and beverage industries, power sectors, steel industries, HVAC industries, plumbing industries, pipeline industries, refineries, etc. Today, the use of pipes is so wide that modern industrial plants can not be thought of without pipes. Types of pipes are decided based on various factors.PEX PipePEX, or cross-linked polyethylene, pipe is one of the newest and most popular pipes to hit the plumbing market. PEX is used only to supply water. PEX is a pipe that is rigid enough to withstand the pressures of water supply but flexible enough to weave throughout walls, ceilings, basements, and crawlspaces. PEX has made water-supply plumbing easier for do-it-yourselfers and professional plumbers. PVC, or polyvinyl chloride, pipe is a drain or vent line type of plumbing pipe. PVC initially gained popularity because it was lighter and easier to work with than traditional galvanized steel pipe. PVC pipe is moderately easy to install and requires little more than a hacksaw and a miter box to cut. PVC glues together with solvents.Besides, there are many other types of pipes such as PPR Pipe, PEX/ PERT/ PE Aluminium Pipe, Pure PEX/ PERT Pipe, etc. And pipes are alawys used together with fittings, for example, PPR Pipe and Fitting is a most commonly used material. Of course, fittings can also be devided into many types. To an uneducated homeowner, pipe fittings are as numerous and confusing as choosing the right screw or nail for a construction project. The materials vary and the specific purpose, although precise, seems daunting to figure out. Our plumbers in Houston & Rosenberg can help repair or repipe your yard. We can help repair and repipe gas lines and water lines, whatever you need, our plumbers can help! Here is a brief overview of pipe fittings, their purpose, and the materials offered. Obviously, pipe fittings are attached to the end of pipes that allow them to change direction, control the flow, and change the diameter of the pipe. Elbows are used to change the direction of flow between two pipes. Elbows are generally available with an angle of 22.5o, 45o and 90o. If pipes are of same diameter then normal elbows are used otherwise Reducer elbows are used. Elbows are made of different materials. These are generally coming with female threads and we can fix them by butt or socket welding also. Reducer is a pipe fitting component which reduces the flow size from larger to smaller by reducing size of pipe. Usually there are two types of reducers are available. One is concentric reducer which is like cone shaped with gradual decreasing around the pipe but in this case accumulation of air may possible and it results in cavitation. Other one is eccentric reducer which is having one edge parallel to connecting pipe due to which air accumulation is not possible. There are other fittings made of different materials as well such as PPR Fitting, PEX Fitting, Compression Fitting, Press Fitting, Brass Fitting, etc. 

Дата Публикации: 11-05-22

ifanplast.com

Описание: ifanplast.com Indoor plumbing has been around for a long time, and the materials used for the pipes have gone through many changes. For decades, metal and ceramic were the most common pipe materials. Many homes today still have galvanized steel, clay, or even cast iron piping. Starting in the 1970s, copper replaced galvanized steel and is today the most common metal used in plumbing systems.Plastic pipes, however, have an important part in plumbing. Various types of plastic water and sewage pipes are easier to work with when compared to copper. The first use of plastic pipes was in the 1930s, and with the 1960s they rose in popularity among plumbers thanks to advances in plastic manufacturing that made these pipes more useful in general. There's no single type of plastic used to manufacture pipes. For years, a gray plastic called polybutylene was common for plumbing systems, but it's no longer used because it splits and creates leaks. If you have old polybutylene pipes in your house, we strongly recommend you arrange to have it replaced with a newer type of plastic pipe. Here are the three types of plastic water pipes that are commonly used by plumbers today: This is the material you're probably most familiar with, and it serves a number of roles in a household aside from in the plumbing. Most main water lines are made of PVC. It's not as flexible as some other types of plastic, and because it warps at high temperatures (hotter than 140°F) it isn't used for hot water lines or in kitchen applications. This type of plastic water pipe will not corrode and features a low heat conductivity. CHLORINATED POLYVINYL CHLORIDE (CPVC Pipe) This is PVC piping that's gone through chlorination (treatment with chlorine). CPVC is more durable at higher temperatures and pressures than PVC and is common in industrial plumbing. For homes, it's great for carrying drinking water and handling the hot water lines for which PVC is unsuited. CPVC is more flexible as well. However, it cracks if it freezes, so CPVC isn't useful for water mains because those pipes must be buried in the ground. CROSS-LINKED POLYETHYLENE (PEX Pipe)Plumbers often use PEX in home plumbing systems thanks to its many advantages. This type of plastic water pipe is useful for both hot and cold water applications, and is the favorite pipe found carrying freshwater in kitchens and bathrooms. PEX is very flexible, so it fits into most spaces and is inexpensive and easy to work with. It comes in different colors, making it easy for plumbers to identify hot and cold lines for future work. They do need to have support, however, because of their flexibility. Except for the three types above, there are other types of pipes with different materials such as PPR Pipe, HDPE Pipe, PPH Pipe, etc. A professional plumber knows the right types of pipes, whether metal or plastic, to use for water line repairs, replacements, and upgrades. Also, the pipes need Pipe fittings to connect the pipes together and allow you to customize your plumbing to suit your needs. There are lots of different kinds of Plastic Fittings with multiple different purposes, such as the drainage of rainwater. Plastic Fitting can be devided into different types as well, such as PPR Fitting, CPVC Fitting, HDPE Fitting and so on. 

Дата Публикации: 11-05-22

hznmpiphznmpipeline.comeline.com

Описание: hznmpipeline.com Ceramic Tile Lined Pipe has very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe and gives a very smooth surface. Outer of straight pipe is common steel pipe, cladding realized by forming high chromium lining via centrifugal forming technique. The advantages of Ceramic Tile Lined Tube with its own irreplaceable performance win the favor of consumers, and play an important role in abrasion market. Wear Pipelines Layer is a seamless steel pipe, and the inner layer is alumina ceramics. Ceramic liner layer hardness is up HV1100-1400, which is equivalent to tungsten carbide cobalt. The wear resistance performance is 20 times higher than carbon steel tubes. Alumina Ceramic Sheet Wear-resistant Tube can resist industrial wear problem mainly by a few millimeters thick corundum inner layer, which is much better than alloy steel pipe and cast tube resisting by both composition,organization and thickness. Wear-resistant ceramic composite pipe quickly occupied the market, in addition to high quality and good performance, but also because of its cost performance in wear and corrosion resistant than other pipes. For the abrasion resistant pipe of the same size and terms of unit length, wear-resistant ceramic composite pipe weighs only around half of wear-resistant alloy casting,each meter project cost lower by 20% -30%; only one-third the weight of cast stone pipe, construction cost per meter decrease 5% -10%; during high corrosive or high temperature environment, the price of ceramic lined pipe is only a fraction of stainless steel and nickel-titanium tube. Ceramic wear pipe tube are widely used in mine filling material, powder ore and tailings transport, coal-fired power plants feeding powder, slag, ash and other wear-resistant pipes,It is also very suitable. Ceramic wear wear pipeline transport is strongly rot acid, alkali, salt and abrasion both solid, liquid delivery pipe wear over. Ceramic tile lined pipe to form the basic principles: Bimetallic composite steel pipe basic principles: outside the tube is responsible for the pressure and the role of rigid support pipe, liner bear the role of corrosion resistance.The outer tube can be used according to the flow and pressure requirements of the conveying medium. Choose the carbon steel pipe with different diameter and wall thickness, hot-dip galvanized steel pipe, straight seam welded pipe, spiral pipe, low pressure medium pipe, high pressure boiler, Oil cracking with seamless pipe, pipe and so on. Diameter from φ20-φ1020mm, wall thickness from 2.5-50mm. The lined pipe can be austenitic stainless steel 304, 304 L, 316, 316 L, copper-based alloy, nickel-based alloy, Hastelloy, titanium, titanium alloy, duplex stainless steel and other new high corrosion resistance alloy material. The lining wall thickness can be based on service life and welding process requirements from 0.3-4mm. It will be assembled inside and outside the tube placed in the sink with the cluster of explosives placed in the lining liner axis. The explosive instantaneous production of explosive force causes the water pressure within the tank increased instantaneously, increasing in water pressure. The expansion of the outer surface of the outer tube produced, and under the action of water pressure, the external tube continued to expand until the pressure disappeared; And the outer tube had in the axial direction inward contraction for the final composite forming. The Ceramic Lined Pipe can be devided into many other different types such as Ceramic Sleeve, Bimetal Composite Pipe, Cyclone Wear-resistant Tube, Super Polymer Wear-resistant Tube(ultra Polymer) with Surfacing Plate. 

Дата Публикации: 11-05-22

goodwillrubber.net

Описание: goodwillrubber.net It is so easy to live by an "out of sight, out of mind" mindset when it comes to your vehicle. The truth is, it can definitely be overwhelming to think about all the little machines and components that make your vehicle function properly. But believe it or not, there are many elements in your vehicle that are made up of material that wears out over time, like rubber Automotive Rubber PartsThe great thing about rubber is that it is resistant to many of the chemicals used in your vehicle. Rubber can also tolerate heat and cold very well, though overtime it will melt or crack. Rubber also doesn't conduct electricity, so it can prevent a charge from escaping and damaging other parts of your vehicle. Many of the hoses in your vehicle, like your radiator hoses which carry coolant to keep your engine at the proper operating temperature, are made of rubber. Overtime, these hoses will crack and can cause leaks. It's important to get these components replaced when excessive cracking occurs, to keep from costly engine repairs. Other hoses in your vehicle connect to fuel lines, air conditioning, power steering and your braking system. Your timing belt is responsible for keeping your engine's various components working together in synchronization. Because it is made of rubber, it will stretch and crack overtime. A slipped timing belt can cause engine misfiring and a completely severed timing belt can cause a complete engine breakdown. Just like all the other belts in your vehicle that provide power to other major systems like your ac compressor and your power steering pump, the upkeep of these belts is extremely vital to your vehicle's systems running safely and efficiently. Rubber is also used to make many gaskets in your vehicle. Gaskets are little rubber rings that help create a seal so there's no leaks when fluids are flowing through pipes and hoses. Rubber is also used to create shields for electrical pieces in your car like spark plugs. Many other rubber parts are also indispensible for a vehicle, such as Auto OEM Rubber Part, Rubber Molded Parts, Rubber Molded Parts, Rubber Chimney Cap, Silicone Rubber Parts, etc. Automotive Seals for a safe ride are essential as well. Seals that can withstand extreme temperatures and environments is a critical capability when it comes to the countless mechanical operations we rely on everyday, especially in the inner workings of our cars. Seals help keep everything in your car in working order, from the mechanisms under your hood to your wheels and trunk. They also prevent leakage, keeping oil, coolant, and gas in your car so you can make it safely from point A to point B. And there are even seals around your doors and windows to keep the rain, snow, and cold (or hot) air out, helping to maintain the interior comfort of your car. Except for those, some Silicone accessories are used together such as Silicone Extrusion Parts, Silicone Extrusion Tubing, Silicone Extrusion Seals, etc. 

Дата Публикации: 11-05-22

firedoorfactory.com

Описание: firedoorfactory.com The prime purpose for fire doors is to save lives and stop the progress of fire in support of both escaping occupants and fire-fighting activities. They are an important part of a building's passive fire protection system and an essential requirement for the vast majority of premises including residential, public buildings, offices and factories (specific building regulations must be checked). The main functions of fire doors are: To allow egress from a space and to close once releasedProtect escape routes from the effects of fire (smoke, gases and flames)Potentially limit the amount of oxygen available and slow the growth of a fire Fire doors are manufactured to withstand the spread of fire for a given period, normally a minimum of 30 minutes. This allows time for people to leave the building via an escape route if other routes are impacted by the effects of fire. Fire doors are an engineered component which includes the frame, door leaf and any fixtures and fittings. They can be solid or made with a special core, often flax board or a wood composite material. They will be fitted with intumescent seals, installed in the frame or leaf, which seal the door on impact with heat to stop the spread of fire and/or smoke around the edges of the door. Doors will similarly be fitted with smoke seals to prevent the passage of smoke in the early stages of a fire. Fire-rated doors must be installed correctly in accordance with the manufacturer's instruction and include the specified ironmongery and other facilities which represent the doorset as originally tested as this is critical to the door's performance in the event of a fire. The British Woodworking Federation believes "third party certification is the only way to ensure that Fire Doors are manufactured consistently to protect lives and save property. Cutting corners can cost lives." Fire doors can be made with a combination of timber, steel, gypsum, and aluminum, and the most widdely used ones are Steel Fire Door and Wood Fire Door. They can also have windows, which are made from borosilicate or ceramic glass (both of which offer a higher fire resistance than standard glass), and may contain an anti-shattering wire mesh. To enhance their fire-stopping abilities, fire doors are flush with the frame. Any or all gaps are filled with silicone-based fire-resistant sealant. These are often accompanied by a keluar (exit) sign and an intumescent strip attached at the bottom of the door, which expands when exposed to heat to prevent smoke from seeping underneathFire doors are commonly designed to include a closing mechanism. Usually fitted at the top of a door, these spring-loaded or hydraulic mechanisms force the door closed, preventing fire and smoke from passing from one area to another. Just like fire doors, many Security Doors and Hospital Doors are also uses Wooden Doors or even Steel Doors to ensure better security. 

Дата Публикации: 11-05-22