Patent GB-656266-A (GB)
Title: Improvement in fabrics and method of making same
IPC: D06M15/423
Filed: 1948-05-18
Abstract: Composite yarns, each made of a core portion of at least one continuous filament of a synthetic thermoplastic substance and a wrapper portion of spun fibres for each core, are formed into a fabric which is partially set, i.e. stabilized against dimensional change and against thread slippage, by heat treatment and then, for completion of the setting, is subjected to the action of an alkali, or is treated with a solution of a thermosetting resin or glyoxal in presence of a catalyst.  The core thread may be sized, e.g. with gelatine or polyvinyl alcohol before associating it with the wrapper. The composite yarn may be sized before fabric formation.  The first stage of setting may be effected by means of boiling water or steam or by dry heat, e.g. by running the goods through a calender or over heated drums.  The temperature and duration of the treatment are such as to cause the spun fibres to lock themselves around and conform to the contours of the core filaments but are such that any fusing or permanent adhesion of the individual yarns is avoided.  For the core portion of the composite yarn there may be used continuous filaments of nylon or other polyamide or of vinyl chloride-acetate copolymers. The wrapper portion may be formed by one or more rovings of spun regenerated cellulose, cellulose acetate, nylon, or polyvinyl chloride-acetate, fibres, or cotton, wool, or other natural fibres. The fabric may be scoured and dyed between the two stages of the setting treatment.  For the completion of the setting, the fabric may be run through a bath of 30-50 per cent caustic soda at 100 DEG  F. Alternatively, the fabric may be passed through a solution of glyoxal and an acid catalyst and then subjected to heat curing. Alternatively, the fabric may be treated with urea-formaldehyde or melamine-formaldehyde, in presence of a catalyst, and then subjected to heat curing.  Specifications 636,682, and 636,688, [both in Group IX], are referred to.ALSO:Composite yarns, each made of a core portion of at least one continuous filament of a synthetic thermoplastic substance and a wrapper portion of spun fibres for each core, are formed into a fabric, which is partially set, i.e. stabilized against dimensional change and against thread slippage, by heat treatment and then, for completion of the setting, is subjected to the action of an alkali, or is treated with a solution of a thermosetting resin or of glyoxal in presence of a catalyst.  The core thread may be sized, e.g. with gelatine or polyvinyl alcohol before associating it with the wrapper.  The composite yarn may be sized before fabric formation.  The first stage of setting may be effected by means of boiling water or steam or by dry heat, e.g. by running the goods through a calender or over heated drums.  The treatment is such as to cause the spun fibres of the wrapper to conform to the contours of the core filaments, any fusing or permanent adhesion of the individual yarns being avoided.  For the core portion, the continuous filaments may be of nylon or other polyamide, or of vinyl chloride-acetate copolymers.  The fibres of the wrapper portion may be of regenerated cellulose, cellulose acetate, nylon, vinyl chloride-acetate copolymers, wool, or cotton. The fabric may be scoured and dyed between the two stages of the setting treatment.  For completion of the setting, the fabric may be run through a bath of 30-50 per cent caustic soda at 100 DEG  F. Alternatively, the fabric may be passed through a solution of glyoxal and an acid catalyst and then subjected to heat curing. Alternatively, the fabric may be treated with urea-formaldehyde or melamineformaldehyde, in presence of a catalyst, and then subjected to heat curing.  Specifications 636,682 and 636,688, [both in Group IX], are referred to.