Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Patent
1997-05-16
1999-07-06
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
57352, D01H 746
Patent
active
059184558
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an improvement made to false-twist-texturizing techniques and relates more particularly to a novel type of process capable of being implemented on machines enabling partially oriented or unoriented yarns to be treated, at high speed, generally at speeds greater than 1000 m/min, the yarn being drawn during the texturizing operation.
To date, two known techniques, one known by the expression "sequential drawing/texturizing" and the other by the expression "simultaneous drawing/texturizing", are employed on false-twist-texturizing machines, depending on the nature of the yarns treated.
In the "sequential drawing/texturizing" technique, the machine is designed in such a way that the drawing and texturizing operations are carried out in succession in two separate zones. A simple juxtaposition of well-known operations is therefore carried out, which enables the operational conditions both in the drawing zone and the texturizing zone proper to be completely controlled, depending on the nature of the yarns treated. However, this technique has the drawback of leading to machines which are complex and tricky to employ.
Consequently, the technique used most nowadays is the technique called "simultaneous drawing/texturizing" in which the drawing phase is carried out on the yarn in the twisted state upstream of the false-twisting spindle, simply by adjusting the speeds between the two yarn-feed systems provided upstream of the oven and downstream of the false-twisting spindle. However, this technique causes implementation problems, especially in the case of polyester yarns for which it is known to be necessary to control completely the zone where the point of striction occurs.
Now, an improved drawing/false-twist-texturizing process has been found, and it is this which forms the subject of the present invention, which makes it possible not only to retain the advantages of machines employing the simultaneous drawing/texturizing process, but also those of the sequential drawing/texturizing technique, by virtue of which improvement it is possible to localize the point of striction of the yarn during the drawing phase very precisely, this being an absolutely necessary condition especially in the case of treating polyester yarns.
SUMMARY OF THE INVENTION
In general, the invention therefore relates to a drawing/false-twist-texturizing process capable of being implemented on a machine consisting, in a known way, of a plurality of identical work positions mounted on a support frame, each position comprising, in the direction of movement of the yarn during its treatment: into the texturizing zone proper, which zone consists of an oven, a cooling track and a false-twisting spindle; corresponding to the degree of drawing to be carried out on the yarn; preceded by a heatresetting oven with a third feed located immediately in front of the reception.
The process in accordance with the invention is characterized in that the point of striction on the yarn during the drawing phase is localized by bringing about a sudden break or modification in the trajectory of the yarn while it is rising in temperature in the texturizing zone, this being achieved by pressing on a surface or element allowing the twist imparted by the spindle to be taken back as far as the first feed system.
By virtue of such a procedure, which goes counter to what is generally accepted in the texturizing field where one of the desired conditions for obtaining good uniformity of the texturized yarn is that the path of the said yarn should be rectilinear in the zone going from the first delivery unit to the exit of the false-twisting spindle, it has been observed that the quality of the yarns produced was superior, especially in the case of polyester yarns.
Such a break in the trajectory of the yarn, which enables the point of striction to be localized, can possibly be carried out by providing additional yarn preheating and path-deviating means before the yarn enters the oven proper. Preferably, the break
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Gabalda Carlos Matas
Mirabel Pierre
ICBT Roanne
Stryjewski William
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