Packing seal and gland seal, is a traditional filling type seal, packing commonly known as packing, installed in the seal seat. Tighten the bolt, packing axial pressure, radial deformation, and the shaft and sealing seat surface tightly against the seal can be achieved to fill the gap to achieve the purpose of sealing. From a microscopic point of view, can also be used to explain the labyrinth effect of the sealing principle. Because the surface of the shaft is more or less rough, and filler only part of the fit, when the shaft for rotary motion, not in contact with the part of the formation of a lot of small labyrinth, gas leakage along the surface of the shaft gap, through the multi-stage labyrinth throttling so as to be able to seal.

Because of the contact type seal, in order to improve the friction performance, so that the seal has a long service life, usually choose the self-lubricating performance of the material to make packing. Compared with the rising ring seal, skeleton oil seal group and other contact type seal, packing seal axial size and power consumption are relatively large, the wear and tear of the shaft is also more serious. At the same time, due to friction heat, some components in the packing are easy to volatilize or carbonization, the use of the need for timely tightening or updating, maintenance is also more troublesome. However, due to the simple structure, low cost, good sealing effect, coupled with the emergence of new filler structure and new materials, this type of sealing in the Roots blower still has some application.

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