Identification PTFE Gland Packing
The most critical factor affecting the function of PTFE packing is its weaving density. However, weaving itself has a strong artistic quality, and the weaving density is often difficult to reflect with numerical values. Experience tells us: the tightly woven PTFE packing can not only resist wear and kneading, but also will not deform when the temperature rises, and then reduce the adjustment of the PTFE packing, and know how to control leakage.
Density: The most critical factor affecting the function of PTFE packing is its weaving density. However, weaving itself has a strong artistic quality, and the weaving density is often difficult to reflect with numerical values. Experience tells us: the tightly woven PTFE packing can not only resist wear and kneading, but also will not deform when the temperature rises, and then reduce the adjustment of the PTFE packing, and know how to control leakage.
Scale: Another factor that affects the effect of PTFE packing is the selection of its scale. However, the Fluid Sealing Association has adopted a tacit mood for practices that go against the original standards in terms of both size. We should focus on preventing the scale from being larger than the normative scale. PTFE packing can be in working condition when it is less than or equal to the standard size. In this way, the woven PTFE packing can be correctly installed in some special situations. It can minimize the time of strike and the possibility of device failure. Rolling weaving and forming seal rings are two useful ways that manufacturers can use to comply with the specifications.
Completeness: Although some PTFE packing weaves use braid and jacket structure. However, in many applications, the weaving method of the fiber is the through-heart weaving method. According to the judgment of the Graphite Composite Gasket of the Fluid Seal Association, the through-core woven PTFE packing has: “The fibers are tightly entangled, like a whole, which is not easy to untie and separate during repair. It will not loosen without a cover. The density of PTFE packing woven through the heart is more uniform and has the potential to stick to the smoothness. “The PTFE packing woven by the non-core method, in many occasions, does not have the ambition of the woven through the heart. Of course, the same is through the heart weaving, the methods used by each company are not the same. Some weavers cut down on the use of straight central strands, and weaving only pay attention to the outer layer or the four corners of the PTFE packing. Others place too many strands in the inner layer or center of the PTFE packing. Although different methods will produce different weaving effects, the most important criterion for good or bad function is still the density of weaving. Of course, if the planning of the through-core weaving is neglected, the PTFE packing will cause the strands to crack under the condition of tensile stress and lose the bonding effect of the weaving.
In a pure environment, all the experimental goals are optimal. The end user should pay attention not to use the rated smoothing agent when repairing the PTFE packing, which will make the original outstanding functions of the PTFE packing unable to be fully utilized. Since this will increase the weight of the PTFE packing and reduce the plasticity, the PTFE packing will lose its impact resistance, and the repair costs will also increase.
Identification PTFE Gland Packing