Patent GB-606853-A (GB)
Title: Improvements in or relating to stretching and other treatments of filaments, foils and similar articles
IPC: D02J1/22
Filed: 1946-01-21
Abstract: <PICT:0606853/IV(a)/1> An apparatus for treating running yarns, filaments, foils, and the like with a fluid under pressure particularly during a stretching operation, comprises between the feeding and take-up means a pressure treatment chamber provided with orifices adapted for the introduction and withdrawal of the yarn, inlets for the treating fluid in the vicinity of the orifices through which the yarns enter the chamber and means for preventing the treating fluid from impinging directly upon the yarns or other articles to be treated. The apparatus is suitable for the stretching of yarns and filaments in the presence of wet steam under pressure. Yarns of total denier of 5000 to 20,000 may be treated.  In the Figure (which does not show the feeding and take-up means) an end-pressure box 1 has a plate 3 as common wall with the stretching chamber 2.  The yarns pass through orifices 4 in the plate 3 into the stretching chamber and out through orifices 5 to the take-up means. Those in plate 3 are substantially of the same cross-section as the unstretched yarns, while the cross-section of orifices 5 is substantially equal to that of the stretched yarns. To the plate 3 is clamped a plate 6 (with packing to effect a perfect seal between them) which is provided with a slot 7 to allow the free passage of yarns from each orifice 4, and round this slot is fixed a shroud 8 which extends perpendicularly to the plate 6 into the chamber 2 for a distance of 3 to 6 inches.  The chamber 2 is also provided with a steam-jet plate 9 with steam inlet pipes 10 leading into steam channels 11 above and below the shroud 8, these channels being provided with orifices 12 through which the steam is blown into the chamber 2.  It is advantageous to use large orifices, since these are not so easily blocked by small solid impurities in the steam.  The apparatus may be employed in the stretching of any thermoplastic polymeric compound, cellulose acetate, polyvinyl acetate, polyvinyl chloride, polyvinyl acetate-chloride and polyvinylidene chloride. Specifications 438,584, 438,656, 443,707 and 558,958 are referred to.ALSO:<PICT:0606853/IV (c)/1> An apparatus for treating running yarn, filaments, foils, and the like with a fluid under pressure particularly during a stretching operation comprises between the feeding and take-up means a pressure treatment chamber provided with orifices adapted for the introduction and withdrawal of the yarn, inlets for the treating fluid in the vicinity of the orifices through which the yarns enter the chamber and means for preventing the treating fluid from impinging directly upon the yarns or other articles to be treated. The apparatus is suitable for the stretching of yarns and filaments in the presence of wet steam under pressure. Yarns of total denier of 5,000 to 20,000 may be treated.  In the drawing (which does not show the feeding and take-up means) an end-pressure box 1 has a plate 3 as common wall with the stretching chamber 2.  The yarns pass through orifices in the plate 3 into the stretching chamber and out through orifices 5 to the take-up means. Those in plate 3 are substantially of the same cross-section as the unstretched yarns, while the cross-section of orifices 5 is substantially equal to that of the stretched yarns. To the plate 3 is clamped a plate 6 (with packing to effect a perfect seal between them) which is provided with a slot 7 to allow the free passage of yarns from each orifice 4, and round this slot is fixed a shroud 8 which extends perpendicularly to the plate 6 into the chamber 2 for a distance of 3 to 6 inches.  The chamber 2 is also provided with a steam jet plate 9 with steam inlet pipes 10 leading into steam channels 11 above and below the shroud 8, these channels being provided with orifices 12 through which the steam is blown into the chamber 2.  It is advantageous to use large orifices, since these are not so easily blocked by small solid impurities in the steam.  The apparatus may be employed in the stretching of any thermoplastic polymeric compound, cellulose acetate, polyvinyl acetate, polyvinyl chloride, polyvinyl acetate-chloride and polyvinylidene chloride. Specifications 438,584, 438,656, 443,707 and 558,958 are referred to.