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Technical Information Special Packings

 

 

 

 

Production Process

After carefully analysing the raw materials required for the various packing products, the actual production process starts, i.e., the impregnation of the yarns. Every yarn is individually impregnated thanks to the use of special equipment. Next comes the braiding stage, during which the impregnating substances seal the fibres in each yarn making up the body of the packing. This is then dried and calibrated in the oven: two promodi, cesses that give the packing stability, precision and quality. In some cases, the packaging can receive secondary impregnation in special tanks to cover the micro-fibres on the outermost surface of the packing. Then the packing is sent to the rolling department where it receives the correct dimensions. The production process ends with packaging and labelling, after which the finished packing is ready for dispatch.


Yarn choice

Depending on the usage, braid/stuffing box packing products can differ in terms of their composition and thus in the choice of yarn. It is therefore necessary to select the right type of material for the specific needs. The requisites required to guarantee top quality are good tightness, excellent resistance to wear and heat, optimal resistance to chemical agents, a low friction factor, the ability to absorb any eccentricity in the shaft and ease of assembly.


Structure

At the end of the production process, the packing must be compact and even. This is obtained by means of a careful choice of the number of diagonals used to weave the packing and the use of the right sort of yarns for the purpose in mind (the finer the yarn, the more compact and smooth the packing); this way, one can also change the elasticity of the packing. In special cases, the packing can also be strengthened with a metal filament (continuous or discontinuous) to increase the resistance of the packing to pressure stress. The sum of all these elements, the experience and the care taken in the Texpack in-house production process result in a technological product of excellent quality.


Seats

By seat, we mean the stuffing box. In other words, this is the space between the outer surface of the shaft and the inner wall of the metal section of the packing nut. The stuffing box packing is placed in this space, in the form of rings of braid packing laid one on top of the other during the assembly process. The depth or width of the seats depend on the diameter of the shaft and the working pressure. The thickness of the stuffing box and, therefore, the cross-section of the braided gasket depend on the diameter of the shaft, according to a universally accepted criterion.


Assembly

The best packing is obtained by using the equipment in perfect conditions: pump, valves, stirrers and reactors must have shafts without radial play (max. 0.08 mm), without grooves or scratches. The stuffing box stud bolts must be parallel to the shaft. In the case of tolerance at the bottom of the stuffing box, add some bushes to prevent the packing from being extruded. The packing used must have the right cross-section for the application: even tiny differences can create problems (it is best not to use packing with millimetre cross-sections on pumps with measurements in inches, and viceversa). Take care not to force the packing when placing it in the stuffing box. Once wound around a spindle of the same diameter as the shaft, cut the rings of packing horizontally. Slip the rings off the spindle without opening them and then place them in the stuffing box, one on top of the other, again without opening them so that the fibres cannot fray. Slide the rings inside the stuffing box, using the packing nut. When the stuffing box is full, press the packing nut into its seat and then tighten the bolts. Start the pump up and slowly register the packing nut bolts to get the required amount of fluid loss (the larger the shaft cross-section, the greater the loss). Special conditions apply in the case of ptfe packing.


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