Patent GB-839295-A (GB)
Title: A process for the continuous production of a sheet of parallel regenerated cellulose filaments closely spaced apart by the viscose or cuprammonium process
IPC: D01D10/04
Filed: 1958-08-07
Abstract: In the continuous production of a sheet of parallel closely spaced regenerated cellulose filaments by the viscose or cuprammonium process, the after-treated and washed sheet is continuously passed through an aqueous softening bath containing oil in the form of an oil-in-water emulsion and/or a surface-active agent, continuously dried and then either again softened, or alternatively, sized by passing it continuously through a second aqueous bath which contains either (1) oil in the form of an oil-in-water emulsion and/or a surface-active agent, or (2) an aqueous solution of a size, and finally continuously dried for a second time.  The second bath may have the same composition as the first bath with the same or a different concentration, or the first and second baths may have different compositions.  The surface-active agent, when used, may be a pyridine derivative, a quaternary ammonium compound of an aliphatic amine, or a derivative of an ethanolamine, e.g. a fatty acid ester or amide or alkyl ether of an ethanolamine.  The second bath may contain a warp size, such as an albuminous product, a polyvinyl alcohol, a polyacrylic acid derivative, or etherified or esterified cellulose or starch.  In an example, a sheet of parallel viscose rayon filaments after-treated and scoured is continously passed through an aqueous 1% solution of triethanolamine stearate adjusted to a pH value of 4.0 with formic acid and maintained at 45 DEG  C.  The sheet is then squeezed out, dried to 5% moisture content by passage over drying cylinders having a surface temperature of 85 DEG  C., passed through an aqueous 1.5% solution of polyvinyl alcohol and finally dried to a 12% moisture content by passage over drying cylinders having a surface temperature of 80 DEG  C.  In a similar example, the first bath is an aqueous emulsion containing 2.5% of olive oil and 1.5% of triethanolamine and the second bath is a 3% aqueous solution of methyl cellulose.  Filaments produced according to the form of the invention in which both baths contain softening agents have particular softness and dyeing uniformity.  When the second bath contains a size the filaments are free from stiffness and can be wound on flangeless supports. Specification 810,040 is referred to.ALSO:In the continuous production of a sheet of parallel closely spaced regenerated cellulose filaments by the viscose or cuprammonium process, the after-treated and washed sheet is continuously passed through an aqueous softening bath containing oil in the form of an oil-in-water emulsion and/or a surface-active agent, continuously dried and then either again softened or, alternatively, sized by passing it continuously through a second aqueous bath which contains either (1) oil in the form of an oil-in-water emulsion and/or a surface-active agent, or (2) an aqueous solution of a size, and finally continuously dried for a second time.  The second bath may have the same composition as the first bath with the same or a different concentration, or the first and second baths may have different compositions.  The surface-active agent, when used, may be a pyridine derivative, a quaternary ammonium compound of an aliphatic amine, or a derivative of an ethanolamine, e.g. a fatty acid ester or amide or alkyl ether of an ethanolamine.  The second bath may contain a warp size, such as an albuminous product, a polyvinyl alcohol, a polyacrylic acid derivative, or etherified or esterified cellulose or starch.  In an example, a sheet of parallel viscose rayon filaments after-treated and scoured is continuously passed through an aqueous 1% solution of triethanolamine stearate adjusted to a pH value of 4.0 with formic acid and maintained at 45 DEG  C.  The sheet is then squeezed out, dried to 5% moisture content by passage over drying cylinders having a surface temperature of 85 DEG  C., passed through an aqueous 1.5% solution of polyvinyl alcohol and finally dried to a 12% moisture content by passage over drying cylinders having a surface temperature of 80 DEG  C.  In a similar example, the first bath is an aqueous emulsion containing 2.5% of olive oil and 1.5% of triethanolamine and the second bath is a 3% aqueous solution of methyl cellulose. Filaments produced according to the form of the invention in which both baths contain softening agents have particular softness and dyeing uniformity.  When the second bath contains a size the filaments are free from stiffness and can be wound on flangeless supports.  Specification 810,040 is referred to.