| 摘要 |
In order to seal hermetically threaded pipe joints a polytetrafluoroethylene monofilament with a rectangular cross-section is used, said monofilament being wound onto the external threading on the end of the smaller-diameter pipe onto which the internally threaded end of the larger-diameter pipe is wound. Small quantities of lubricant, preferably a biodegradable detergent composition, is applied onto the wound PTFE monofilament, moistening said wound material externally. In order to manufacture the PTFE monofilament, individual monofilaments are extruded and the extrusion additive removed from them by means of heating, followed by controlled stretching of the monofilament and calendering so as to impart to the monofilament the desired cross-sectional shape. A single dispenser is envisaged for dispensing the PTFE monofilament from a reel and the detergent composition. |
