PROCEDURE FOR FABRICATION OF FLAT PACKING WASHER AND PACKING WASHER PRODUCED BY THIS PROCEDURE Russian patent published in 2010 - IPC F16J15/00 

FIELD: machine building.

SUBSTANCE: procedure for fabrication of flat packing washer consists in roll winding tape out of poly-tetra-fluoride-ethylene on mandrel forming layer of U-shaped cross section. Tape winding is carried out with tension strength 1-5 kg; there is used a cylinder mandrel with a concave generatrix. The mandrel is equipped with flanges, distance between which is less, than width of the tape so, that the tape is at least triple-layer laid lengthwise at winding. Upon winding operation a fixture with tape is heated to temperature 320-380°C and conditioned at this temperature during 15-60 min. Between flanges surface of the mandrel can be created with two cones mutually oriented with smaller bases. The packing washer has a shape of a flat circular element and is completely made with roll winding porous poly-tetra-fluoride-ethylene tape with layers of U-shape in cross section; also each layer is formed with at least triple-layer lengthwise laid source tape. The packing washer produced by the disclosed here procedure is characterised with firmly connected between them layers of poly-tetra-fluoride-ethylene and does not require a strip ring. The washer can be curved, twisted and bent in halves maintaining its integrity without delaminating. Yet, at the same time external or internal coils can be unwound easily without tearing.

EFFECT: facilitating accurate washer dimensions fitting to required dimensions at assembly.

3 cl, 1 dwg