Patent GB-737183-A (GB)
Title: Improvements in or relating to the manufacture of viscose
Inventor: NEWTON THOMAS DAVID
IPC: D01D1/10
Filed: 1952-08-26
Abstract: <PICT:0737183/IV (a)/1> Apparatus for the continuous ripening and de-aeration of viscose comprises a vessel having an inlet for viscose at or near its lower end and a vacuum connection at or near its upper end, means, e.g. a jacket or tank, external to the vessel for heating or cooling its contents, an outlet pipe within the vessel for withdrawing viscose downwardly through the lower end of the vessel and a shallow funnel of large surface area at the upper end of the pipe into which the viscose gradually spills.  As shown, viscose is withdrawn continuously by a pump 111 from a dissolving and blending unit G of the kind described in Specification 737,185 and fed to a first ripening and de-aeration unit H1 consisting of a vessel 113 immersed in a tank 112 of warm liquid and having an inlet 114 at the bottom and a vacuum connection 115 at the top.  The viscose in the vessel 113 overflows into the shallow funnel 117 at the upper end of the outlet pipe 116, flowing in a thin film over the large surface area of the funnel and being thus de-aerated.  The viscose flows through the pipe 116 into the bottom of the unit H2, which is similar to the unit H1 and is kept cold by liquid in the tank 112a.  The viscose is pumped by a pump 118, from the outlet pipe 116a of the second unit H2 into two filtering units I1 and I2 arranged in series, each consisting of two filters 119 arranged in parallel.  The viscose is then fed through a pipe 121 to spinnerets or other extrusion devices.  The viscose may be passed through a third de-aerating unit (similar to and operating under the same conditions as the unit H2) after leaving the filtering units, or the unit H2 may be placed after instead of before the filtering units.  The vessel 113a of the second ripening unit H2 may be designed to retain the viscose longer than the vessel 113, or two second ripening units H2 may be used in series.  Specification 707,422 also is referred to.ALSO:<PICT:0737183/III/1> Apparatus for the continuous ripening and de-aeration of liquids, e.g. viscose (see Group IV (a)), comprises a vessel having an inlet for the liquid at or near its lower end and a vacuum connection at or near its upper end, means, e.g. a jacket or tank, external to the vessel for heating or cooling its contents, an outlet pipe within the vessel for withdrawing the liquid downwardly through the lower end of the vessel and a shallow funnel of large surface area at the upper end of the pipe into which the liquid gradually spills.  As shown, the liquid is fed to a de-aeration unit H1 consisting of a vessel 113 immersed in a tank 112 of warm liquid and having an inlet 114 at the bottom and a vacuum connection 115 at the top.  The liquid in the vessel 113 overflows into the shallow funnel 117 at the upper end of the outlet pipe 116, flowing in a thin film over the large surface area of the funnel and being thus de-aerated.  The liquid flows through the pipe 116 into the bottom of the unit H2, which is similar to the unit H1 and is kept cold by liquid in the tank 112a.  The liquid is pumped by a pump 118, from the outlet pipe 116a of the second unit H2 into two filtering units I1 and I2 arranged in series, each consisting of two filters 119 arranged in parallel, from which it is delivered through a pipe 121.  The liquid may be passed through a third deaerating unit (similar to and operating under the same conditions as the unit H2) after leaving the filtering units, or the unit H2 may be placed after instead of before the filtering units.  The vessel 113a of the second de-aeration unit H2 may be designed to retain the liquid longer than the vessel 113, or two second de-aeration units H2 may be used in series.  Specification 707,422, [Group IV (a)], is referred to.