Wall-Board Processing Machinery for Construction Industry:
1. Supply and Batching System
2. Protective Paper System
3. Mixer and Shaping Machine
4. Setting And Cutting System
5. Kiln Feeding System
6. Dryer
7. Heat supplying system
8. Dryer Exiting System
9. Sawing System
10. Stacking System
11. Auxiliary Equipment
12. Control system
National Standard of Calcined Gypsum(Standard No.: GB/T 9776-20080)
(1)Scope of application:Gelled material made by dehydrating natural gypsum(raw material). Its main component isβ-GaSO4·1/2H2O, without any admixture or additive.
The natural gypsum should be in conformity with requirements of "gypsum rock(JC/T700) for making cementing material" gypsum rock of Grade 3 or more higher grades.
(2)Classification:It is classified to be three grades: 3.0,2.0,and 1.6 according to its 2h strength(breaking strength).
(3)Composition: β-GaSO4·1/2H2O content(mass fraction) in Calcined gypsum should be not less than 60.0%
(4)Physical and chemical performance:
| Grade |
Fineness(Screen residue of 0.2mm square screen)/% |
Setting time |
2h strength/MPa |
| First setting |
Final setting |
Flexural
strength |
Compressive strength |
| 3.0 |
≤10 |
≥3 |
≤30 |
≥3.0 |
≥6.0 |
| 2.0 |
≥2.0 |
≥4.0 |
| 1.6 |
≥1.6 |
≥3.0 |
Note: 1Mpa=10.2kgf/cm2
Quality Standard (Based On 9.5mm Thick Gypsum Board)
| The weight per unit area |
≤8kg / m2 |
| Longitudinal breaking load |
≥360Newton |
| Horizontal breaking load |
≥140Newton |
| Hardness |
Edge hardness and end hardness should be no less than 70N |
Raw materials&energy consumption list(Based on 9.5mm Regular board)
| Item |
Consumption |
| Gypsum powder(semi-hydrated gypsum CaSO4·1/2H2O) |
5.8kg/m2 |
| Protective paper |
0.38-0.48kg/m2 |
| Gypsum board adhesive(starch) |
0.004kg/m2 |
| Foaming agent |
0.008kg/m2(≥32%) |
| Glue |
5g/m2 |
| Electricity |
0.22kwh/m2 |
| Water |
4kg/m2 |
| Natural gas (8200 kcal/ m3) |
0.46 m3 /m2 |
Production Method of Gypsum Board Production Line:
This production line used the calcined gypsum powder, water and various additives are automatically and separately measured and conveyed into the mixer by continuous auto-conveying system. After well mixed into slurry and spreaded onto the gypsum board protective paper which is continuously moving forward. During the progressing process, the slurry is gradually dispersed with vibration, and jointed with back protective paper. When going through extruded shaping machine, the slurry is fully wrapped by upper and lower paper, pressing into well-regulated flat board which is continuously brought forward as per a stable and strictly controlled speed. After any minutes , the calcined gypsum in the slurry is hydrated again and crystallized into tiny interpenetrative dihydrate gypsum crystal with higher strength. And then, the wet gypsum board with a certain strength and regular shape is precisely cut into individual boards with set size by an auto-controlled cutting system. The individual boards are orderly arranged, turned over by program control system and brought into the dyer. In the dryer, the absorbed water in the boards is evaporated away. following strict drying system(The crystal water in the gypsum crystal has no loss). After brought out from the dryer, the boards are gradually cooled down in the running process. The front sides of every two boards are folded after turned over again, and the two ends are cut into boards with regular size and nice appearance by end sawing machine. And finally the boards are conveyed to automatic stacking machine and stacked into well-ordered finished products before put into storage.
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