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In the 16th environmental department act, the necessity of asbestos elimination was approved and the task was given to a committee by the name of committee of planning the elimination of asbestos in factories.


In the second day 1379 of mordad The committee decided to completely eliminate asbestos in 7 years.


In the 15th of mordad of 1387 as the deadline had been crossed and the production and use of asbestos had not been stopped, the chief of presidents office issued a letter to the environmental department, by the order of the president,  to stop all asbestos use until a suitable substitute has been found . The director of industrial mines of the industry ministry issued the order in the same day. Considering the pressure by the environmental department to enforce the 16th act of the high council of environmental department, in the 1389 16th day of aban the industry minister issued a letter to the first council of the president to keep using white asbestos only, until a suitable substitute is available and as soon as such substitute is introduced, within 6 months all use of white asbestos will be stopped.


In 1390 khordads first, after surpassing the due deadline by nearly 3 years, the environment preservation department issued an order to stop all use and importation of asbestos.


In 1390 khordads the 4th, the manager of industrial mine department of industry ministry expressed his concern regarding the closer of factories to the council of industry minister. The labor minister in 1390 tir’s 12th, issued a letter to the president insisting on the permission asked in 1380 aban’s 16th and asked for the act of foundational industry and environment act by the number of 446557 in the 24th day of tir of 1389 to be issued.


At the end, the first council of the president issued a letter banning any kind of asbestos use in the process of factories including spare machine parts and construction materials. In this letter the use of asbestos in the production of pressured and sewer pipes was allowed under certain conditions until the 1391 shahrivar’s 31 day and the deadline was announced none renewable.


In 1390, baverce co. considering the 20 years of experience in this field and considering the necessity of replacing asbestos in the fiber cement industry started to launch the plan of asbestos free fiber cement sheets in its own concrete pipe factory.


The purpose of cellulose preparation, is the production of high flow cellulose in order of fiber expansion without fraction.  This means that the fiber after the expansion becomes thinner. Liquid limit of cellulose is measured by a Canadian Standard, Freeness method or C.S.F, according to the ISO 5267/2 standard with the measurement unit of ml and the Schopper Riegler method of SR according to the ISO 5267/1 standard with the measurement unit of degree or (°). The extent of expansion required is a function of production type. (Flat sheet meant for inner use, flat sheet meant for outer use and corrugated sheets)

Without the appropriate expansion, cellulose fiber has the below disadvantages:

A: fibers are too big and rough to use beside cement. In this situation the tensile strength of the product is low and does not have the necessary area to ensure the ultimate tensile strength in fiber cement sheets.

B: The rough and big fibers can’t keep the necessary amount of water in the screen tank. The mesh cracks of the screen tank is bigger than the cement pieces, sillies and other extra materials. So the big fibers can’t stop the escape of these materials and a large portion of these materials exit the screen tank and cause a considerable amount of trouble in the water cycle use.

C: the excessive amount of cellulose in the plasticity production process causes a decrease in the quality. For example resistance against freezing of fiber cement products can decrease, also particle separation and cement parts from the fiber cement area can occur and cause some problems for the color coverage of the product.

Baverce co. cellulose production process is equipped with the below machinery to prevent the above problems:

  1. Water tank is equipped with water volume controller
  2. Cellulose feeding system including elevator, equipped with load cell.
  3. Cellulose pulper with 8 cubic meter velocity and 75 kv power
  4. Cellulose evacuation pump from the cellulose pulper (Centrifuges type).
  5. Two opening cycle tanks or refining cellulose fibers.
  6. Trash rack
  7. Refiner feeding pump, mohno type, with consistent discharge rate.
  8. 250 kv disc dual refiner to open or refine cellulose fiber
  9. Dual cellulose processing tanks with mixer, by the velocity of 100 cubic meter.
  10. Cellulose transition pump to material building section.

Cement boards, after completing grasping and curing process, have higher moister than the environment and after being exposed to the dryer, loose some of their moister and have a minor shrinkage and a minor reduction in their dimension like most construction material. So if the cement boards are not properly dried or in other words, their moister has not been reduced enough, after being installed in the structure and being exposed to the fresh air; lose some of their moister and the wrenches attached to the boards cause shrinkage or convexity or concave. This can cause internal tension and lead to cement board rapture from the wrench installation points and cause fracture from the edges of the board.

This is why the cement boards need to be dried and have their moister reduced to an acceptable amount to stop this flaw from happening.

Considering this problem baverce co. has designed, manufactured and launched an oven dryer to place its productions in before delivering it to the customers to prevent such problems occurring before installation.