How to distinguish the quality of ptfe laminated fiberglass filter bags?
PTFE laminated filter bags material is a new type of filter material with high efficiency, low resistance, high filtration precision and long life. Its superior function is unparalleled by ordinary filter material. At present, it has been widely used in steel, cement, ferroalloy and carbon black, and the effect is excellent. But the function of the PTFE laminated fiberglass filter material sold on the market is very different now. In the meantime, the 90% is glued ptfe laminated fiberglass dust filter (which is adhesive on the glass fiber base cloth with PTFE microporous membrane). Its function is very poor and can be said to be a fake. It has now formed a severe result for many users because of the user's glass fiber knowledge of membrane filter media is so little that it is impossible to identify the true and false form of glass fiber coated filter media.
The glass fiber coated filter material is a high temperature resistant filter bag, which means that the high temperature resistance is the minimuum function of the glass fiber coated filter material. However, when the adhesive glass fiber film filter material is over 80 C, the adhesive used is now dissolving. At the moment, the membrane will fall and the resistance is increased. Filter material (it is the use of high temperature hot pressing skills to cover the PTFE microporous membrane on the glass fabric, without using any adhesive in the production process) can be connected in a operation less than 260 degrees centigrade, and its function will not be changed.
The quality of ptfe laminated fiberglass filter bags material is different, so it is very important to distinguish the quality of ptfe membrane fiberglass filter material. The following is how to distinguish the quality of ptfe laminated fiberglass filter bags material without special equipment, and talk about several methods that we have summed up in practice.
1. Intuiitive identification of the samples provided by the production plant:
1-A. hand touch feeling: the ptfe coated fiberglass filter material produced by hot pressing skills is very smooth, and the appearance of the adhesive ptfe laminated filter material has a moist feeling, but the products of each production plant are different in wet sense, but in any case the feeling of the two materials must be significantly different.
1-B. Adhesive 90% is used as a general organic solvent type adhesive, so if the ptfe laminated filter material is soaked in an organic solvent, the adhesive can be lost, then the membrane can be easily removed from the glass fabric. Organic solvents that can be used include benzene, ketones, lipids and other organic solvents.
1-C. The use of adhesive glass fiber film filter material can not withstand high temperature characteristics, we can warm it to about 100 degrees C, then the PTFE microporous membrane can be uncovered from the glass fabric, and the hot pressed glass fiber coated filter can not be uncovered at the temperature of 300 degrees C.
2. There are two ways to distinguish the quality of the ptfe laminated fiberglass filter bags in practice.
2-A. the system resistance in practice is the main standard to test the quality of PTFE laminated fiberglass filter bag. In the operation, the resistance changes of the hot pressed PTFE laminated fiberglass dust filter bag and the adhesive PTFE membrane fiberglass filter bag are very different. The operation resistance of the dust collector with the hot pressed PTFE laminated fiberglass filter bag is low and very stable. However, the operation resistance of the dust collector using the adhesive PTFE membrane fiberglass filter bag is not only high, but also agility to rise, until it is blocked, and there will be the falling appearance of the membrane. We have seen the example of sticking PTFE membrane fiberglass filter bag for four hours. So in the operation, we can see that the resistance of the filter can be judged by the resistance of the filter.
2-B. if your use of glass fiber membrane filter bag filter has been working well, but for some reason, a small amount of glass fiber coated filter bag produced by another manufacturer is replaced, in this case, it is impossible to distinguish the quality of PTFE laminated fiberglass filter bags by checking the change of the resistance of the dust collector, because the resistance of the dust collector changed little. But if remove one filter bag and check after the filter bags working for one or two months, that will be easy to distinguish the PTFE laminated fiberglass filter bags quality. If the filter bag is very soft (the same as before filter bags used), this filter bag must be hot pressed PTFE laminated fiberglass filter bags, if the filter bag is hardened, and even the appearance of the caking (It's hard to scrape the lump down with a knife), or if there is a membrane falling off the appearance, the filter bag must be glued PTFE membrane fiberglass filter bag, which can not be used.