Common problems of gypsum board

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Common problems of gypsum board
Shijiazhuang Jingjin Mechanical Equipment Installation Co., Ltd. -- 13833456715
1. What are the specific definitions and specific index requirements of knife coagulation, initial coagulation and final coagulation?
It refers to the setting time of gypsum slurry, which is defined differently at home and abroad. The answer is different. It mainly depends on the calcination result of gypsum powder. Later, it can be corrected by additives.
2. What is the specific function of adhesive?
The gelling agent is a kind of composite additive developed in recent two years. The effect is unknown and the cost is increased.
3. Is the function of adhesive and plate starch the same?
Board starch and adhesive should be additives with the same function and different names.
4. What is the specific effect of glucose?
Prevent over burning.
5. When the hydration reaction reaches the highest temperature (about 42 ° C), does it mean the end of final coagulation?
Hydration reaction can only be said to be completed by a few percent, and temperature is a reference index.
6. The hydration time of phosphogypsum is delayed, and the hydration time of desulfurization gypsum is delayed. If not, the hydration reaction is advanced, does it mean that the final setting time is also advanced?
The hydration time of various gypsum is related to the calcination method and impurities contained in gypsum.
7. Is the gap between 9.5mm plate scoring saw blades 7.2-7.3 related to the small wedge belt?
It is related to the edge shape of gypsum board
8. Basis for adjustment of coagulant accelerator dosage, specific value?
There is no specific value for the wet hardness of gypsum board, which can be added or subtracted as required.
9. Temperature, function of foaming agent and specific influence on ingredients?
Affect foaming effect
10. When the thickness of gypsum board changes, for example, 9.5mm is changed to 12mm, the belt speed is reduced, and the dry and wet additives are increased, what is the adjustment ratio? How early should the initial and final setting time be?
The adjustment depends on the formula, and the setting time is adjusted according to the actual situation.
1 1. What is the normal content of chloride ion? What effect will high content have on boards? What effect will low content have on the board? How to control the content of chloride ion?
It is better to be below 100ppm, which affects the bonding of gypsum board and is easy to deform. The bottom content can reduce the board weight and cost. Control the content of water washing and mixing.
12. Should we judge whether the bonding of wet boards is good or not? How to control wet bonding (such as what to adjust)?
Take samples for testing to determine. Optimization of paper, gypsum powder, setting time, etc.
13. The hydration rate is reflected by temperature. Why does the temperature of the board gradually increase from the forming station to the front of the cutting knife? (The temperature of the board rises from more than 30 ℃ to more than 42 ℃) Is the highest temperature generally at more than 42 ℃? What is the effect of high hydration rate on boards? What effect does low hydration rate have on the board? How to adjust the hydration rate?
Hydration rate is the same as hydration efficiency.
14. When the board specification (length, width and thickness) changes, how to adjust the first horizontal? How to adjust the temperature of Zone 3?
One horizontal only needs to adjust the length and thickness settings. The temperature of Zone 3 only needs to be adjusted when the thickness changes, and it should also be adjusted according to the actual situation.
15. How to adjust the cutting knife?
Adjust according to the thickness and length of the plate.
16. Ink jet operation?
Consulting suppliers
17. I. Specific operation steps and precautions for horizontal startup and shutdown?
See the operation manual of knife area
18. Basis for placing the baffle plate at the outlet of dryer? Because the problem of the cylinder is that the plate is put manually, what is the basis? How often does the board come out? Observe that the stop time of each floor is different. There are more than 20 seconds and more than 30 seconds?
There are two modes of automatic and manual board placement. The boards with the most layers are placed first.
19. First, how to deal with problems of the collecting belt equipment? For example, the motor of No. 2 horizontal conveyor, the inlet and outlet motors, the collecting belt motor and the main chain motor have problems. Is short-term and long-term exception handling the same?
Recover for a short time and shut down for a long time.
20. Why can't the 12mm thick boards be accelerated and heated to increase production capacity? Ask the dryers that the dryer can withstand 230 ℃ at most, but it is not good if it is too high.
According to the drying capacity of the dryer.
21. How does the distribution bridge connect each layer?
Photoelectric induction automatic control
22. What are the general operation process specifications for short time shutdown (about one empty zone) and long time shutdown (more than two empty zones)?
According to the actual situation+experience
24. The light sensing effect corresponding to the roller cross on the north side of the dryer inlet? Is it chain speed measurement?
For monitoring
25. How to deal with paper problems: for example, wrinkles, scratches and other problems, how to solve them? And how to set the angle?
Replace the paper and distinguish the defective board.
26. Specific standard of gram weight?
Paper weight is just a paper index. Different paper weights for different boards affect the strength of boards.
27. Specific requirements for gypsum powder temperature and mixer slurry temperature? What is the specific effect of abnormal temperature?
If the temperature of gypsum powder is high, the temperature of slurry will also be high (unless there is a temperature control system), affecting hydration
28. How to control the transition of raw material proportion when changing the plate type?
Adjust according to the height matching of material level
29. Startup and shutdown of mixing zone and precautions?
The fastest time to start, the fastest forming, and wash the mixer immediately after shutdown
30. Precautions and procedures for starting and stopping the dryer?
Check the steam pressure before startup and pay attention to the temperature change during startup. Shut down according to the requirements of steam shutoff
31. Temperature rise curve of dryer and adjustment of main chain?
The main chain does not need to be adjusted
32. Why is the open roller used in front of the cutting knife after the belt solidification?
Save belt cost
33. Percentage of evaporation rate in each area of the dryer?
About 40% 40% 20%
34. How to calculate the plate spacing in the dryer?
No calculation required, automatic control
35. Scientific name, common name, specific function, proportion and adjustment of various dry and wet additives?
There are not many main additives, so they should be adjusted appropriately according to the actual production process requirements
36. Operation and precautions of the first horizontal and second horizontal?
Reduce human operation errors, timely deal with failures and resume normal production
37. What is the regulation basis of dryer fan frequency and moisture discharge valve?
Quality of gypsum board
38. How to deal with the distribution bridge clamping plate and laminated plate at the dryer outlet?
Confirm that the waste board will be disposed after the power is cut off. Clean the photoelectricity. Enter the board again after recovery, serious shutdown
39. Basis for the second horizontal kick of dry waste board?
The gypsum board cannot pass the slitting saw smoothly, and the equipment in the plywood and slitting saw area fails
40. What is the significance of installing connecting pipes for the steam inlet pipes and steam outlet pipes in Zone 1, 2 and 3?
Emergency use in case of failure of electric control valve
41. How to check the over burning and under burning of boards in the dryer?
Not required to be checked in the dryer
42. Three analysis of gypsum board and the influence of crystal water on gypsum board?
A Method to Judge the Quality of Gypsum Board
43. Common problems of dryer?
The door is not closed properly, and the internal blocking board and gypsum board are not well dried
44. Why does the strength test make the paper vertically upward and horizontally downward upward?
The paper strength is measured vertically and the paper strength is measured horizontally
45. Why is the core of gypsum board over burnt and how to deal with it?
Adjust the edge density of gypsum board and the position of wind deflector at the edge of dryer
46. When the gypsum board is changing in size (length and thickness), and the temperature of the three areas of the dryer is adjusted when the board reaches what position, what is the main adjustment method? (Boiler, moisture discharge valve, fan frequency conversion)?
Adjust according to actual operation experience
47. How to adjust the steam inlet valves in the three zones? Does one adjustment affect the adjustment of other valves?
Generally, the automatic control does not need to be adjusted and will not be affected because the main gas pipe is large and the pressure is unchanged
48. How to judge the primary and secondary boards?
There is no grade I and grade II plate, only qualified and unqualified plates.
49. Factors affecting water absorption, how to adjust water absorption?
Add amount of waterproof agent and adjust the amount of additive
50. What factors affect the water balance?
Quality and impurity content of gypsum powder, slurry temperature and additive effect