Calcium Silicate Board Production Process And Storage And Transportation, Construction Precautions

Calcium silicate board is made of inorganic mineral fiber as reinforcing material and siliceous-calcium material as the main cementing material, which is made by pulping, molding, and accelerating the curing reaction in high temperature and high pressure saturated steam to form calcium silicate colloid. In addition to the functions of traditional gypsum board, calcium silicate board has the advantages of superior fire resistance, moisture resistance and long service life, and is widely used in the ceiling and partition walls of industrial and commercial buildings.

The thickness of calcium silicate board is 5 mm, 8 mm, 10 mm or 12 mm, and then slightly larger to reach 20 mm, and even 30 mm. Its thickness specification is mainly based on the density to divide, some are low density, some are medium density and high density. Because the thickness is not the same, so the specifications are not the same size.

The following is an introduction to the production process of calcium silicate board and storage and transportation precautions.

1.Preparation of raw materials. The main raw materials include wet grinding of quartz sand for pulping, crushing and digestion of quicklime, grinding and pulping of wood fiber.

2.Pulping process. In the counter-current mixer, the wood fiber pulp that is thinly ground to meet the pulping requirements is added with slaked lime, cement, quartz powder and so on in sequence. After fully mixing with the counter-current mixer to make a certain concentration of flow pulp, then pumped to the pulp storage tank, and then homogenize it with a single-disk grinder, and mix the pre-mixing tank, and there is a certain concentration and flow rate in the flow pulp type board making machine, and it is inputted.

3.Slurry plate making. The slurry flowing evenly from the slurry box, through the operation of the industrial blanket filtering water, after dehydration to form a thin layer of winding in the molding cylinder, through the multi-layer winding to reach the set thickness of the blank, the control system according to the blank design size automatically cut off the blank out of the knife. The molding machine adopts a molding machine with a diameter of 1600mm, and the blanks are trimmed by transverse cutting edges to become two standard slabs. The standard slabs are stacked by stacking machine, and the stacking adopts 1 steel mold and 1 plate stacking method.

4.Slab pressing. The molded slabs are pressurized by 7000t press for 30 minutes, so that the slabs are dehydrated and compacted under 23.5MPa pressure, which improves the strength and compactness of the slabs.

5.Pre-conditioning and demolding. Wet panels are pre-conditioned in the pre-conditioning kiln until the blanks reach a certain strength and then demolded. The pre-conditioning temperature is 50~70℃ and the pre-conditioning period is 4-5 hours.

6.Steam pressure maintenance. The billets were demolded and sent to autoclave for autoclave curing for 24 hours, with vapor pressure of 1.2 MPa and temperature of 190°C. The billets were then steamed and cured in the autoclave. This method was used to prepare Tobol mullite and hard calcium silicate, which was used to produce silica in the billet during the steam curing process. The quality of the hydration reaction directly affects the strength, expansion rate, and moisture resistance of the calcium silicate board.

1,No collision during loading and unloading, the bottom of the transportation tool should be flat, and fixing measures should be taken after loading to ensure that it will not be shifted and slid on the way.

2,When lifting or forking, the whole pallet of plates should be stacked neatly to prevent the steel rope or forklift shovel from touching the edges of the plates.

3,When loading and unloading manually sheet by sheet, attention should be paid to prevent debris from being caught between the sheets, which may crack or deform the sheets if not cleaned up in time.

4,When handling the board, it should be carried vertically with two persons holding both sides of the board, and it is forbidden to carry it horizontally.

5, The plate should be piled on the level ground or with a special wooden bracket at the bottom, a small number of loose boards can not be upright against the wall.

6, The plate should be stored in the indoor warehouse, if open storage should be covered with thatch.

1, The substrate leveling treatment, flatness and verticality to meet the specification requirements, clean up the surface dust and pollutants.

2,When pasting calcium silicate board, the mortar bonding rate and the amount of anchor bolts need to meet the specification requirements, and the board joints should be extruded.

3, The end of the board seam with adhesive coating, so that the board and the board bonded together, not bonded to a piece of or large board seams should be foaming polyurethane filler fixed to prevent cracking and warping of the board seams.

4, Good anti-cracking mortar layer: anti-cracking mortar thickness of 2-3mm, and then pressed into the alkali-resistant fiberglass mesh. Glass fiber mesh overlap and strengthen the parts need to meet the specification requirements, to be dry and hard to touch the mortar, and then wipe the two smear mortar, until covering the alkali-resistant glass fiber mesh cloth, so that the glass fiber mesh cloth is in the crack-resistant mortar, the total thickness of the smear mortar is 5-6mm, the surface of the smear mortar without smearing and leakage of mesh, and then flat.

5, Has been constructed with cracks in the part of the problem, should be cut open board joints, into the injection of foaming agent sealing. Before gluing, if the plate seam bulging or warping, fixed with anchor bolts, anchor bolts can be a little bit of strength, not too tight to ensure that the whole board leveling and force uniformity, and then gluing filler. For bonding rate is small parts, knocking check, first in the middle of the drum plus anchor bolts, and then in the drum place to take the hole, from the hole to the inside of the board injection of foam, no matter the board seams or the board to take the hole injection of foam to let the foam extrusion outside the board. After the foam is solidified, remove the excess gel on the surface of the board, and then make up the anti-cracking mortar layer.

Calcium silicate board with its excellent performance is widely used in business buildings, entertainment venues, shopping malls, hotels, industrial buildings; factories, warehouses, residential buildings; new homes, renovation and refurbishment of public places; hospitals, stations, theaters; but also to do the road acoustic isolation, acoustic barriers, panels of composite wall panels and so on.

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