A composite yarn consisting of an elastomeric yarn intermingled with a non-elastomeric multifilament yarn and a process for its manufacture comprising the steps of: feeding an elastomeric yarn and a non-elastomeric multifilament yarn through a draw zone adapted to temporarily stretch the elastomeric yarn and to draw the non-elastomeric multifilament yarn and false twisting the elastomeric yarn and the non-elastomeric multifilament yarn together to form a false twisted doubled yarn to a heat setting treatment at a temperature below that at which the elastomeric yarn elasticity would be substantially destroyed.
An every course hose is produced by knitting substantially exclusively a covered elastic yarn into the leg portion knitting fabric thereof. A covering yarn is wound around an elastic yarn as the core yarn to form the covered elastic yarn. The covering yarn is constituted of a plurality of filaments made of a polyamide substantially free from titanium oxide and having a flat cross section with a flatness (b/a) (the ratio of the length b to the width a) of 2.0 to 6.0.
A method for combining a relatively elastic yarn component with a relatively inelastic yarn component is disclosed, and wherein the two components are guided through a jet of high velocity air so as to entangle the filaments and produce a bulked composite yarn. To facilitate the air jet entangling operation, at least the inelastic yarn component is subjected to a filament spreading operation prior to its advance through the air jet. The method may also be incorporated in a false twisting process, and wherein the inelastic component is false twisted so as to transversely spread its filaments prior to its being brought into contact with the elastic component and subjected to the air jet.
A method of manufacturing a composite yarn and composite yarn produced thereby in which a spandex yarn is fed to an air entangling or covering jet while being pre-elongated. Simultaneously, a multifilament partially oriented thermoplastic yarn is fed to the yarn entangling or covering jet while being partially or completely drawn to orient further or completely the thermoplastic yarn. The thermoplastic and spandex yarns are fed through the yarn jet while the filaments of the thermoplastic yarn are entangled to produce a composite yarn with the spandex yarn as the core and the thermoplastic yarn as a covering therefor. The composite yarn is then fed through a false twister and false twisted with the false twist being heat set in the thermoplastic yarn at a temperature which does not adversely affect the spandex core to produce an air entangled false twist texturized composite yarn. If not completely oriented when false twisted, the thermoplastic yarn is further drawn to complete its orientation while being false twisted.
Disclosed is a textured composite yarn composed of a first multifilament yarn having a lower extensibility and a second multifilament yarn having a higher extensibility, as well as a process for manufacturing such textured composite yarn. The first multifilament yarn forms a core yarn, while the second multifilament yarn is wrapped at least partially around the core yarn. Some individual filaments of the second multifilament yarn are entangled and interlaced with some filaments of the first multifilament yarn in the boundary region between the core yarn and the wrapping yarn.
A method of composite yarn formed of a false twist crimped, heat set elastomeric core yarn intermingled with a false twist crimped, substantially heat set partially drawn, non-elastic yarn. The resulting composite yarn is substantially free of alternating "S" and "Z" twists, as well as voids. The composite yarn of the present invention is formed by increasing the number of turns per inch of the false twist and adjusting the operating conditions of the D/Y ratio, draw ratio of the elastic and non-elastic yarns, disc stacking, heat, and the machine speed to achieve a balanced or stable thread line.
