For the wire mesh impregnation is one of the anti-corrosion methods, and now the more mature method in China is: powder impregnation method, which originated from the fluidized bed method, the so-called fluidized bed is applied to the contact decomposition of petroleum on the Winkler gas producer, and then developed the solid-gas two-phase contact process, and gradually used for metal coating. Therefore, it is sometimes still called “fluidized bed coating method”, the actual process is to add the powder coating to the bottom porous and breathable container (flow tank), and the blower is sent from the bottom to the treated compressed air, so that the powder coating turns to reach the “fluidization state”. Becomes a evenly distributed fine powder.
We know that the fluidized bed is the second stage of the solid flow state (the first stage is the fixed bed stage, the second stage is the air transport stage), and the flow rate (W) continues to increase on the basis of the fixed bed, the bed layer begins to expand and loosen, the bed height begins to increase, and each powder particle is floated, thus leaving the original position for a certain degree of movement. The hook mesh then enters the fluidized bed stage. Section bc shows that the powder layer in the fluidized bed expands, and its height (I) increases with the increase of gas speed, but the pressure in the bed does not increase, and the hook mesh changes the flow rate within a certain range without affecting the unit power required by the fluid, which is the characteristic of the fluidized bed, and it is the use of this characteristic to carry out the coating process. The uniformity of powder fluidization state in the hook mesh fluidized bed is the key to ensure the uniformity of coating film. The fluidized bed used in powder coating belongs to “vertical fluidization”, and the fluidization number must be found out by test, generally to be able to coat, and the suspension rate of powder in the fluidized bed is as high as 30 ~ 50%.
The plastic coated hook mesh stands in the outdoor environment, the main load is the wind load; The impact load of football, basketball and other ball games is reflected in the sub-coefficient in the strength calculation, which can not be considered separately; There is a certain safe distance between the purse Seine and the competition area, and under normal circumstances, there is no need to consider the impact of people and the impact of off-site vehicles, but there should be a certain safety reserve. The net must be firm and stable under wind load, such as overturning or damage may cause damage to people near the purse Seine, so the bending and tensile strength of the net column must be checked during design, and the stiffness and stability of the purse Seine must be ensured according to the structural requirements.
Post time: 20-11-23