Always, every fiber cement comes with a trade line .like this The purpose is to detect felt distortion and take the necessary corrective action. Causes of trade line distortions are generally caused by: 1 – Variation of the parallelism of the sheet machine rolls 2 – Different weight of the elementary layer on the felt 3 – Bending of the felt rollers 4 – Variation of the formation pressure on the sheet 5 – various – in the event the felt is too wide or becomes wider because of inadequate tensioning systems and therefore becomes necessary to trim the same, the easiest way is to trim the felt along the machine direction yarn, exactly between the two MD yarns.
The material of the fiber cement felt The FC felt always be made of PA6 or PA66 yarns and fibers. The high pressure Jet water Continuous cleaning with low pressure fan shower (4 –6 BAR) and overlapping high pressure needle jet oscillating showers up to 20 bar either inside or outside of the felt or from both sides, using fresh or clarified water. The oscillating stroke should be double the nozzle spacing distance in order to assure uniform felt coverage. Shower nozzles should be checked on a regular basis for clogging. DISTANCE BETWEEN NOZZLES: 75-120 mm, common 100mm Nozzles SIZE: 1.0mm to 2.0mm The specific flow of water is a very important factor as it is required to determine the water demand and therefore the power of the pump to be installed Vacuum system The essential technical characteristics of the vacuum boxes are: VACUUM: from 25 to 40 cm Hg for positions that go from initial to the final ones, that is, from more open felts to the heaviest and compact felts. AIR FLOW: 70 l/min./cm² for speeds up to 90 m/min. Vacuum must be equally distributed on the whole width and the slots must be covered with low friction coefficient, materials like ceramics or HDPE. Some manufactures use adjustable slot vacuum boxes, which can be useful when you need to vary vacuum and air delivery values. It is important that each suction box be connected to its own vacuum system; nevertheless, there should be the possibility of differentiating the vacuum and the deliveries in the different positions, based on the actual requirement. In normal operating conditions, two separate boxes are installed for each felt. The effectiveness improves if you leave enough space between the first and the second box for the re-distribution of the water in the felt. If this is not possible, a lubricating shower is required between the first and second box. Chemical cleaning We recommend thorough backwashing of the felt with a 3 – 4.5 % hydrochloric acid solution(HCL) before any significant down time or when felt is accidentally contaminated due to poor conditioning, too much flocculants etc.. Chemical cleaning can be of important help to integrally restore the resilience and the receptiveness of the felt. Slacken the felt tension and apply the solution through a separate chemical shower with machine in crawl speed for about 30 minutes. After all the solution has been applied, turn […]
How to make the fiber cement felt To be make the fiber cement felt, it will be next process: 1st weave the base fabric and first heat_set the base fabric 2nd Carding the fiber web for the felt 3rd needle the base fabric and fiber web together by the needle loom 4th Heat_set the felt and cut into the right size 5th Check the permeability , GSM ,width ,length ,thickness of the felt 6th package the felt 1st weave the base fabric 2nd carding the fiber web 3rd needle the base fabric and fiber web together (This is needling the 2.9 Meter width fiber cement felt for double width flow_on machine) 4th heat_set the felt and treatment the edge 5th check the permeability of the felt 6th package the felt (The fist felt is 1.6 meter width and the second is 2.9 meter width)
Fiber cement board industry report in china 2016 Until 2016-11-30, there are total about 124 fiber cement Board (calcium silicate board) company in china. There are about 240 production lines in total . Here is the company in GuangDong province, with total 42 production lines.The production capacity of these 18 company is about Two hundred million SQM per year. NO Company Province City 1 Eternit Guangzhou GuangDong GuangZhou 2 Newelement Board Industry GuangDong FoShan 3 SoBen Green Building Industry GuangDong KaiPing 4 JinFort Board Industry GuangDong FoShan 5 Olar Board Industry GuangDong FoShan 6 HuiZhou Board Industry GuangDong FoShan 7 DongShang Board Industry GuangDong DongGuan 8 Baokang Board Industry GuangDong KaiPing 9 JinBeiLin Green Building GuangDong FoShan 10 FoShan SanLe Building material GuangDong FoShan 11 Lesso Board Industry GuangDong FoShan 12 XiongSu Board Industry GuangDong FoShan 13 JiaMeiLe Board Industry GuangDong FoShan 14 GuangZhou Jiaheng Board Industry GuangDong GuangZhou 15 FoShan JiaFeng Board Industry GuangDong FoShan 16 FoShan TongFu Board Industry GuangDong FoShan 17 JieYang HaoFuMan Board Industry GuangDong JieYang 18 LianJiang RongMao Board Industry GuangDong ZhanJiang
15th IIBCC IN FUZHOU, CHINA 7th to 11th November 2016 A record number of 257 delegates preregistered for the conference and several more registered at the conference itself. Delegates were treated with up to 5 days of activities depending on their preferences. Monday saw 90 participants choose between basic or advanced courses in fibrecement technology. On Tuesday delegates were able to listen to 24 presentations from suppliers to the industry. They were also able to visit 23 booths of exhibitors that remained open funtil the end of the conference. Also on Tuesday evening delegates were welcomed to the conference by Professor Holmer Savastano at a cocktail reception in the hotel foyer. On Wednesday and Thursday presentations were made by authors of peer reviewed papers.Presentations started with our invited speaker Professor Caijun Shi on “Reinforcement Mechanisms of Fibers in UHPC Composites”. This was followed by around table discussion with 10 experts from the industry and 16 presentations on a variety of technical topics including new materials, auxiliary materials and production processes.