Reasons for bad curing of powder coating film

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Reasons for bad curing of powder coating film

Abstract: Unlike the liquid coating liquid volatile norm, powder coating coating dust spillage is its norm, good imported equipment is expensive, reasonable design, large safety margin, dust is not too serious; cheap equipment in the design is almost no margin, coupled with maintenance can not keep up, spare parts scrap replacement is not timely, the use of powder particle size and material bad, to catch up with the production schedule, and then encounter high temperature and high humidity, etc., the recovery The effect is more and more unsatisfactory and unbearable to see.
The main recycling methods of powder coating include cartridge recycling and combination of large cyclone and small cyclone. By improving the recovery system, more effective and clean painting can be achieved.
1 Cartridge detection and cleaning device
There is no uniform scale when the powder recovery cartridge should be scrapped, often the cartridge itself has been damaged and cracked before it is replaced, and as a result, the powder has blocked the subsequent ultimate filter material - filter cotton or filter frame; or the powder spillage is seen to be serious before the cartridge is remembered to be replaced.
Since the cartridge is to rely on the pores to retain the powder, separation of powder and air, the pores will have the risk of being blocked. And the pores are blocked, recovery efficiency is reduced is not observable to determine the naked eye. Therefore, a device is designed to automatically clean the cartridge and detect the degree of permeability of the cartridge, stipulating that when a certain degree of blockage is reached (e.g. 50% or high or low), the recovery capacity is indicated as insufficient and the cartridge is scrapped.
If the permeability of each cartridge, such as the air flow rate, can be automatically detected online continuously, the management of the equipment will rise to a digital level, and the recovery effect can be expressed in figures.

2 Frequency conversion recovery system
For the recovery system, maintaining a stable air flow rate means a stable recovery effect. However, under the same recovery capacity, the workpiece is different, the attachment efficiency of powder is different, plus the guide effect of certain large workpiece and long workpiece, it will also produce powder spillage. The selected variable frequency fan can adjust the recovery air volume within a certain range to meet the requirements of both noise reduction and recovery capacity.
Some production lines have limited design capacity, but sometimes too many production tasks, the use of faster chain speed can solve the production needs, but if the recovery wind is certain, will lead to serious powder spillage, variable frequency recovery fan can adapt to a certain increase in production capacity, but also to ensure the recovery effect.
The variable frequency recovery system can increase or decrease the air volume according to the recovery effect, so that the powder coating production has a certain mobility. When the production volume is small or the powder spraying volume is small, the fan air volume can be reduced, which has a certain energy-saving effect.

3 Clean powder room technology
The most basic clean powder room should be clean and free from flocculation, impurities and good airtight space.
Advanced more powder room should be no powder accumulation. Powder room with bottom blowing device can be over sprayed powder will be transported in time for use in the powder barrel, so that the amount of powder required for spraying turnover is very small, the powder can be used in a timely manner. Quality problems occur and the amount of waste powder produced is greatly reduced.