| 摘要 |
1,085,482. Producing knitted stretch fabrics; coating and shrinking fabrics. SAMCOE HOLDING CORPORATION. Jan. 21, 1966 [Jan. 22, 1965], No. 2943/66. Headings D1L, D1P and D1S. Elastic stretch and restorability are imparted to knitted fabrics containing ordinary fibres, i.e. fibres other than special manufactured stretch yarns such as spandex, e.g. cotton, by impregnating the ordinary fibres of the fabric with a curable resin in liquid form, e.g. a methylol imidazolidone resin, compressively shrinking the impregnated fabric, and curing the resin in the fabric while it is in the compressively shrunk state. The fabric is optionally unraveled or de-knitted to produce elastically stretchable and restorable yarn which may then be made up with other fibres into knitted or woven fabrics. If the fabric is to be deknitted a tubular knit fabric is preferably treated. A heat-curable resin is preferably used and after impregnation the fabric may be adjusted to a proper moisture content preferably by drying and then steaming prior to compressive shrinking, the drying being effected at a temperature below the curing point of the resin. The resin composition may also contain fibre lubricants, catalysts and wetting agents. The fabric may be laterally distended to a predetermined, enlarged and uniform width prior to compressive shrinking if a two-way stretch fabric is desired. For special effects the compressive shrinking may be carried out to such an extent that pleats are imparted to the fabric. In Fig. 1 the knitted fabric 13 is passed from supply container 14 to impregnating bath 15 which contains three rollers 16, 17 arid 18 arranged in triangular configuration and forming among them a reservoir 19 of the impregnating resin solution, the rollers 16, 17 forming an entrance nip and the rollers 16, 18 forming an exit nip. The fabric is then dried in dryer 20, optionally stored and subjected to other processing operations, e.g. stitch line straightening, steamed in steamers 22 to impart a desired uniform moisture content to the fabric and passed to the compressive shrinking apparatus 21 in which it is fed to the shrinking zone at a first predetermined speed and controllably released from the zone at a second predetermined and substantially slower speed, which may include a pair of nip-forming rollers at least one of which is supplied with an interior heating medium in the form of steam or heated oil to impart a temporary set to the fabric and a confining shoe. Curing is effected in curing chamber 23. |
