Winding – tensioning – or guiding – Bobbin or spool – Open-work structure
Patent
1981-02-19
1983-04-12
Christian, Leonard D.
Winding, tensioning, or guiding
Bobbin or spool
Open-work structure
68198, B65H 7520
Patent
active
043795293
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a tube for yarn bobbins of the type having variable length in axial direction.
BACKGROUND ART
Tubes for yarn bobbins are devices comprising a perforated cylindrical or frusto-conical surface for retaining the yarn reeled on the tube while said yarn is exposed to a liquid treatment, especially a dyeing with a subsequent drying, in an apparatus in which several tubes are located end to end on perforated distributor pipes through which the treatment liquid is pumped out through the yarn.
The present invention and the prior art will be described below with reference to cylindrical tubes as a conical shape of the tube does not change the problems with which the invention is concerned, viz. the problems arising in connection with the liquid treatment, but which shape is substantially used for the sake of rewinding the yarn.
Tubes for yarn bobbins must especially meet the following three requirements: number, which to a single dye-works may be of the magnitude 1/2 million. dyeing apparatus to minimize the consumption of water and chemicals, especially to avoid pollution of the environment with the waste liquids.
The oldest known tube which is used today is a perforated metal cylinder. Tubes of this type are placed on the distributor pipes with discs between every two tubes and are compressed by means of a cap screwed on the end of the distributor pipe, thus providing a seal between the metal cylinder and the intermediary discs. These tubes provide the most uniform dyeing of yarn, but they have the disadvantage that they are rather expensive and allow only a very bad filling of the space in the dyeing apparatus, partly because the intermediary discs take up room and partly because the tubes do not permit a compression of the yarn bobbins. In fact these tubes permit a filling of the yarn dyeing apparatus which is only well over half of what can be obtained with certain other types of tubes.
Therefore tubes have been produced of variable length in axial direction, so that the yarn bobbin can be compressed. Such a tube may for instance be a compressible metal spiral or two metal cages displaceable relative to each other and locked together with a ring, and which are kept in a stretched position by a helical spring as described in U.S. Pat. No. 2,818,222. This type of tubes permits a good filling of the space in the dyeing apparatus, but is expensive due to the nature of the material since in practice only stainless steel can be used, and such tubes give rise to uneven dyeing.
A second type of tubes of variable length in axial direction is the type disclosed in British Patent specification No. 1,169,962, and it is made of an injection moulded plastic material in which the cylinder surface is formed by a row of concentric rings connected by strings extending obliquely relative to the axial direction and being of such dimensions that the tube may be compressed in the axial direction by virtue of the resilience of the material. These tubes have the advantage to be very inexpensive, but are in practice only disposable tubes because the plastic material undergoes a heat set at the high temperatures used for dyeing and drying, and therefore the tubes are either to be discarded or to be straightened again after every use after being heated in hot-air. Furthermore it is not possible either by the use of these tubes to obtain a desired uniformity of the dyeings.
The cause of the uneven dyeing when using the known tubes of variable length has turned out to be the fact that no efficient seal exists between two adjacent bobbins in spite of the compression thereof. This has the effect that a large part of the circulating amount of dye liquid takes the easier path betwen two bobbins instead of passing through the bobbins. In practice this is a major drawback since the amount of dye liquid passing between the bobbins is uncontrollable. Measurings have shown that at lower temperatures minimum amounts of from 0 to 20% pass, but this only applies as long as the yarn is resilient, whe
REFERENCES:
patent: 2936964 (1960-05-01), Tigges
patent: 3253436 (1966-05-01), Soltis
patent: 3759460 (1973-09-01), Fyan
patent: 4176811 (1979-12-01), Becker et al.
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