What is the difference between a white hot melt gasket and a black hot melt gasket?

Waterproof board is the main structural material of tunnel structure anti-drainage, if the operation is not standardized, it will cause quality hazards to the tunnel and seriously damage the durability of the tunnel. The traditional tunnel waterproof board hot melt welding process (hot air gun or electric soldering iron) is greatly affected by the melting point of the waterproof board and hot melt gasket, and it is difficult for operators to grasp the hot melt time and welding intensity, and welding coke, welding penetration, and unstable welding have become common quality problems. The strap hanging is due to the fact that the waterproof board cannot be closely attached to the surrounding rock, which is easy to cause the thickness of the second lining to be insufficient or the back of the second lining to be hollowed.

If the waterproof plate and the hot-melt welding ring are not welded well, either the waterproof board will not be welded through, and the waterproof will not play the role of waterproofing, or the welding will not be firm, and it is easy to fall off and cannot achieve the purpose of fixing the waterproof board. Okad waterproof board ultrasonic welding machine produces 20kHz 35kHz high-voltage, high-frequency signal, through the transducer system, the signal is converted into high-frequency mechanical vibration, added to the waterproof board, through the friction between the waterproof board and the gasket surface and its internal molecules, the temperature transmitted to the interface of the Okard waterproof board ultrasonic welding machine increases, when the temperature reaches the melting point of the work itself, the waterproof plate and gasket at the interface are quickly melted, and then fill the gap between the interface, when the power supply is disconnected, the high-frequency vibration stops, The waterproof plate and gasket are cooled and shaped under a certain pressure, and finally the welding effect is achieved. The ultrasonic welding process method of the tunnel waterproof plate is simple, efficient and economical.

There is not much difference, except that the connection between the white one and the waterproof board is relatively higher

No, the production materials of each manufacturer of waterproof board are different, so the melting point of the gasket and the waterproof board is different, the white gasket can generally be well bonded with the waterproof board, and the black one is not necessarily, because the black one is doped with recycled materials, etc., so the effect is not so good, of course, it is also judged according to the performance of the waterproof board used. I would like to introduce you to a good company, called Changsha Chunda Hardware ** Company, their company's gasket is good, and it can adapt to the needs of various waterproof boards.

Purchase high-speed rail, urban rail with steel insulating card steel insulating cable tie (cross, slotted), hot melt gasket, SK-2 sleeper rail protective cover, telescopic tube, screw cap protective cover. All are produced from new raw materials. I found the manufacturer, went to inspect the scale is very large, the product meets the national standard, high quality and low price, has been used in Shanghai-Kunming high-speed railway, Dongguan-Huizhou urban rail Guangzhou Metro Line 3.

If you have the same (135) needs (3906), look for him (6651).

Corrugated tooth composite gasket is a kind of metal composite gasket, generally first with a precision lathe or a special milling machine on the two sides of the metal flat gasket processed into a concentric wave-shaped groove, the upper and lower two sides of the tooth tips are staggered with each other, so that it has better compression resilience performance, because the contact with other sealing surfaces is a plurality of concentric circles of line contact, so it has a labyrinth sealing effect, according to different media and working conditions, flexible graphite, PTFE, asbestos-free board or some other soft metals can be selected, pasted on the two sides of the gasket, Using the sealing of the soft covering layer and the strength and elasticity of the metal to achieve a better sealing effect, in most cases we recommend graphite as the sealing layer, when the medium reacts to graphite or requires a clean environment, we recommend the selection of the newly launched excellent performance of the expanded PTFE as the paste layer, the metal corrugated tooth composite gasket generally does not need a lot of compression force, can achieve the sealing effect.

The corrugated tooth composite gasket can also be used directly without pasting the sealing layer, and can also achieve good sealing effect, and has better compression resilience performance compared with the toothed composite gasket, especially in large-size smoke and gas pipelines, low pressure, high temperature, or unevenly twisted flanges, with a more significant sealing effect.

Stainless steel 304L, 321, 316Ti, 309, 347, 410, duplex (2205, 31803), Monel (400), indium nickel Inconel (600, 625), Incoloy (800, 825), Hastello (B2, C276), titanium (T2) and other special stainless steel or alloy materials.

Graphite gasket is made of pure graphite plate or metal (toothed plate, flat plate, mesh) reinforced graphite plate cut or stamped, with many excellent sealing properties, such as: thermal stability, self-lubrication, corrosion resistance, no aging, no brittleness, etc., can be used stably for a long time under harsh working conditions, and rarely requires maintenance. The lining material is available in different metal sheets.

The types can be selected without hemming, inner hemming, outer edge, inner and outer edge. Graphite cutting gasket is made from pure graphite plate punching or cutting, it has good corrosion resistance, high and low temperature resistance, good compression resilience and high strength, a variety of round complex geometric gaskets are widely used in pipes, valves, pumps, pressure vessels, heat exchangers, condensers, generators, air compressors, exhaust pipes, refrigerators, etc.

Graphite gaskets are mainly used in various industries such as pipe flanges, heat exchangers, valve covers, etc., as well as special-shaped flanges on liquid level gauges and levels.

Graphite gasket is made of graphite wire and woven and shaped. Graphite gasket is suitable for sealing stuffing boxes of various valves, pumps, reactors and other equipment working under high temperature, high pressure and strong corrosive media.

I only know that the hot melt gasket is used for tunnel waterproofing, as if there is no difference between these classifications, the effect is the same, our engineering team was purchased in a company in Changsha last time, and the quality is quite good.

The quality of the hot-melt gasket is short of the amount of volt guess or has to bend the code to see its raw materials, the thickness of it, mainly depends on the adhesion is good, to introduce you to a company, Changsha Chunda Hardware ** company, the sales of gaskets have been very good, the quality is very good.

As long as the hot-melt gasket depends on the degree of toughness of his sticky source, the hot-melt gasket produced by Hebei Hengshui Tuan Plastic Company is very good, and several companies of our China Railway are using it, and it is also introduced by friends of Hail.

The "hot melt gasket" for tunnel waterproof board is made of high-temperature injection polymer material HDPE through a special mold, which is mainly used in railways, highways, tunnels, etc., and is used to install and fix geotextiles and waterproof membranes.

When welding the hot melt gasket, the direction from the bottom to the top clockwise or counterclockwise from both ends of the waterproof board is used to use a hot air shot gun to heat weld on the back of the waterproof board, at this time the waterproof board should be at a 45 degree angle with the hot melt gasket, and rub it by hand on the outside of the waterproof board to make it fully soluble, when welding at the top, 2 people need to hold the waterproof board, and use a wet towel to cool down the ice to prevent the waterproof board from falling off.

It depends on how you measure it, a gasket is about three cents.

Purchase high-speed rail, urban rail with steel insulating card rebar insulated cable tie (cross, slotted), hot melt gasket, SK-2 sleeper rail protective cover, telescopic tube, screw cap protective cover reed with manufacturers I found, to inspect the scale is very large, the product meets the national standard, high quality and low price, with the nuclear finger has been used in Shanghai-Kunming high-speed railway, Dongguan-Huizhou urban rail Guangzhou Metro Line 3. If you have the same (135) needs (3906), look for him (6651).