The burning surface of gray granite is characterized by rough and natural surface, no reflection, fast processing speed and relatively cheap price, which is often used for dry hanging of external walls. Moreover, the burning surface of grey granite can also prevent skid, and it is widely used in subways, airports, squares, dry hanging on external walls, sidewalks, parks, parking lots and other places.
The processing of burnt noodles has certain requirements on the thickness of stone to prevent the stone from being broken during processing. Usually the thickness is at least 2CM, and some stone materials require higher requirements.
In addition, some materials will change color during firing. For yellow granite such as rust stone (G682), the rust stone after fire will show a certain reddish color instead of the original yellow rust color.
Extended data:
Matters needing attention in avoiding the wave marks on the burning surface of gray granite;
1, only the correct working attitude can produce good products, and poor technology is not terrible. As long as you have solid basic skills and cautious working attitude, technology is accumulated and honed in long-term practice.
2. The main cause of wave marks is the gun mouth. The muzzle usually needs to be modified. There are two kinds of nozzles for burning plates: welding nozzles (generally welded into circular nozzles) and cutting nozzles (welded into diagonal nozzles).
The nozzle of welding gun adopts type 20 No.4 or No.5, which is divided into eight teeth, ten teeth and twelve teeth. The more teeth, the more nails, and the greater the gas consumption. A more feasible method is to block the nozzle with steel wire, which will increase the pressure and reduce the consumption.
The cutting nozzle adopts 100 nozzle, but this kind of gun head is not easy to master and consumes a lot of gas. The badly burned stones are especially fast, and the well burned stones, such as peach blossom red, are wasted. The quality and efficiency of the muzzle differ by more than 50%, that is to say, if you burn 100 square meters a day, the modified muzzle can reach 150 or more.
3. The best ignition point.
If you have a good tool, you should also be able to use it flexibly, otherwise it will be counterproductive. Too much firepower and too little firepower are also one of the reasons for the wave marks. To find the best ignition point, you have to work hard.
4. Correct operating posture.
The speed of the gun should be uniform, not drifting, one fast and one slow. The angle between the muzzle and the board surface should be as flat as possible, but it should be fixed, and there should be no flash. The eating board should be even and wide, not narrow and wide. Adjust the fire moderately, try to be consistent, neither big nor small. Try to pull the wire (wash it with water). If the joint should be as forward as possible, the joint will not be too deep.