Textile treatment unit

Details Textile treatment unit Textile treatment unit

1996-09-23

1998-08-04

Crowder, C. D.

Textiles: manufacturing

Textile product fabrication or treatment

Of thread interlaced article or fabric

226119, D06G 1004

Patent

active

057875570

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a textile treatment unit.
Such textile treatment units are known, for example, from German Patent DE-PS 14 60 493. The textile material in web form is placed, in folds, on a belt conveyor by means of a folding device. This belt conveyor is arranged in a housing and has an upper side which runs essentially horizontally, forming the conveyor section. The upper side of the belt forming the conveyor section can be horizontal, but can also have a slight upward or downward incline, the angle of which is limited so that it is not so steep that the folds start to slip.
The belt can be a continuous belt of sheet metal or plastic. In general, however, because of the necessity of atmospheric access to the textile material on all sides, it is a belt made of a screen material. The atmosphere can be an air or steam atmosphere, or a steam/air mixture.
Textile treatment units of this type can hold significant lengths of textile webs and therefore permit relatively long retention and treatment times. They are used, for example, for long-term treatments of dyed and printed fabrics (e.g., soaping processes, hot water processes, etc.), for treatments of knit and woven fabrics for boiling and bleaching processes under steamer conditions, and for shrinkage and relaxation treatments.
In the textile treatment processes of this type, the folded material located within the conveyor section rests on the conveyor and is not affected by any external forces. The folds therefore pass through the conveyor section essentially without being moved. Therefore the amount of shrinkage, for example, depends on the inherent shrinkage forces of the fabric, which forces must be able to overcome the weight of the fabric and cause the fabric to contract. The shrinkage which occurs is therefore limited. In particular, however, there is the risk that when the folds are not moved, in some treatments the folds will become permanently manifested in the fabric due to lack of uniformity of the treatment, and will be evident in the finished product.


SUMMARY OF THE INVENTION

The object of the invention is to improve the treatment effect of a textile treatment unit of the type indicated.
The term "local height deviation" is used herein to mean a limited variation, in terms of length and height, of the essentially level conveyor section. The length should amount to at most one-fifth of the length of the entire conveyor section. The height of the local height deviation should be at most on the same order of magnitude. Cases in which the entire conveyor section has a shallow convex curvature form do not achieve the goal of the invention, which is that the folds resting on the belt are loosened slightly when they pass the local height deviation, so that the textile material gives way to the shrinkage forces, and the folds slip slightly, so that they do not always remain in the same location within the textile material and therefore are not so easily permanently manifested in the finished product.
In one embodiment, the local height deviation is an elevation, i.e., the belt conveyor passes over a hump which extends crosswise to the path of the textile material, resulting in the desired loosening of the folds.
Another possible embodiment comprises a recess, i.e., the belt conveyor, with the folds on it, passes over a valley or channel which extends crosswise to the textile material.
The local height deviation can be produced by guiding the belt of the belt conveyor, e.g., by means of guide elements which act on the edges of the belt. In one preferred embodiment, however, the local height deviation is formed as an elevation by a rotating roller arranged underneath the belt, with the axis of rotation of the roller arranged crosswise to the belt, which roller moves relative to the textile material.
The rotating roller has the advantage that there is no sliding contact roller and the belt and therefore no wear on the underside of the belt. The relative movement between the roller and the textile material has to o

REFERENCES:
patent: 3442702 (1969-05-01), Fleissner
patent: 3457029 (1969-07-01), Drago

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