Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Patent
1995-04-24
1998-10-20
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
28248, 57284, D01H 746
Patent
active
058229710
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a heating apparatus, in particular an elongate body, such as a tubular heater for heating an advancing yarn.
Such a heating apparatus is used, for example in a false twist crimping machine.
Apparatus for heating synthetic yarns in false twist crimping machines are known. In general, they comprise heating rails arranged in elongate heating chambers, which are heatable to a certain temperature, and over which the yarn can be guided in that it advances over yarn carriers, so-called ridges, so as to be heated.
For drawing and thermosetting synthetic yarns, tubular yarn guide members are known. For example, DE-AS 13 03 384 describes a guide member, which is looped by the yarn. This yarn guide member has a rotationally symmetric configuration and is provided with a bead at its yarn contact end. It can be heated from its yarn contact end toward its yarn runoff end to temperatures increasing continuously from a yarn drawing temperature to a yarn setting temperature, and be configured and arranged such that it can be looped by the yarn in a steep coil. This yarn guide member is complicated in its structure, and requires for its manufacture a plurality of costly operations. In addition, it is expected not to operate with the reliability to be met by high-speed processes.
In modern false twist crimping processes, the yarns advance at a considerable speed. The temperatures prevailing in the heating chambers are therefore accordingly high, which may result in damage to the yarn, when it contacts the heated surfaces of the heater. Furthermore, it is difficult to provide a uniform level of the yarn path over the heated surface, especially in curved heating chambers, in a simple manner, which ensures that the advancing yarn is heated without damage. Moreover, the known heating devices do not permit a modification of the predetermined curvature or length of a yarn path without great expenditure.
Since such heating apparatus are also used in the treatment and processing of film tapes and filaments, the latter will always be included, when in the following reference is made to a yarn.
A thermoplastic material for the yarn includes in particular polyamide or polyethylene therephthalate (PA 6, PA 6.6), but is not limited thereto.
It is the object of the invention to provide a heating apparatus, which allows to vary the heat transfer to the yarn in a simple manner, in particular without changing the temperature of the heating apparatus. This means, the invention is to provide a heating apparatus, which enables temperature profiles within wide limits in accordance with the necessary heat transfer conditions. In particular, the invention is to provide a heating apparatus, which makes it possible to change both the curvature and the length of the yarn path and length of yarn contact. In this connection, it should be possible to operate the heating apparatus in particular also at high temperatures of all structural components, which allow to make effective use of the selfcleaning effects.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a yarn heating apparatus which comprises an elongate heater body which includes a heating surface extending longitudinally along the length thereof, and a plurality of yarn carriers mounted to the heating surface in a spaced apart arrangement along the length of the heating surface. Yarn guide means is provided for guiding an advancing yarn along a yarn path which extends longitudinally across the yarn carriers in spaced relation to the heating surface. At least some of the yarn carriers are variable in their longitudinal width or in their spacing from the heating surface in a direction transverse to the yarn path, and wherein the heat transfer between the heating surface and the advancing yarn may be adjusted by adjusting the relative position between the yarn carriers and the yarn path transversely to the yarn path.
In another embodiment of the invention, the yarn c
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Barmag AG
Stryjewski William
LandOfFree
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