land Packing or Compression Packing or Packing was created as a sealing device, but because it has to drip, it is more accurately called a restrictional device. GlandPacking was born earlier than MechanicalSeal. Usually made with a braid or woven system with a box cross section. The constituent materials can be graphite, acrylic, PTFE, asbestos and so on.
Why does GlandPacking have to drip?
Because friction between the shaft sleeve with GlandPacking will generate heat which in some cases causes GlandPacking to expire. This requires cooling as well as lubrication by giving the opportunity for the process fluid to trickle out.