Textiles: fluid treating apparatus – Machines – With gas – steam or mist treating
Patent
1995-04-13
1997-01-07
Stinson, Frankie L.
Textiles: fluid treating apparatus
Machines
With gas, steam or mist treating
34242, D06B 2318
Patent
active
055905498
DESCRIPTION:
BRIEF SUMMARY
This invention concerns an improved device for feeding into and withdrawing a fabric from a pressurized autoclave for continuous decatizing, wherein friction is reduced to a minimum and simultaneously an optimum sealing against steam leakages is provided.
A device is already known for a leakproof introduction of a fabric into an autoclave for continuous decatizing, as described and claimed in Patent Application MI91001119 filed on Apr. 23, 1991 by the present Applicant and Inventor, which device substantially includes a rotating cylinder adapted to seal the slit provided for the fabric and the related back cloth to enter the autoclave or exit therefrom, as well as two juxtaposed resilient members acting as sealing gaskets. However, it is apparent that friction developing between the rotating center member and the pair of stationary side gaskets, preferably comprising inflatable air bags, may be too high because of the wear it may cause. To waive this problem, sheets of antifriction material are inserted between the cylinder and the side gaskets, possibly wrapped around special rollers in order to be able to move forward, continuously or intermittently, for the purpose of changing the contact area with said gaskets.
However said approach might not be considered completely satisfactory mainly when particularly abrasive felts are used as back cloths, while it is apparent that there is no way to reduce below a certain threshold the friction which develops between a rotating and a stationary surface.
Therefore, it is an object of this invention to reduce said friction as much as possible by replacing the stationary gaskets with rotating side cylinders, whereby only revolving friction develops which is certainly lower than the sliding friction likely to arise at the stationary surface of the rubber gaskets. In any case, sealing is provided by said felt associated with the fabric, whose large thickness allows it to be compressed in the nip between the cylinders, whereby it actually operators as a real gasket.
According to a preferred embodiment, the engagement area between center cylinder and the pair of side cylinders defines a nip which is not so deep as the thickness of the two associated materials (the felt and the fabric) in that the side surface of the center cylinder and/or of the pair of side cylinders is recessed for a width not narrower than the felt width.
In a further embodiment, the three cylinders have smooth surfaces whose mutual distances are smaller than the thickness of the two associated materials, antifriction material pads beind provided in this case at the two nips, on either side of the cylinders, in order to assure side sealing against steam leakages.
The above and other objects, advantages and features of this invention will become more apparent from the following detailed description of some embodiments described herein for exemplary and non limiting purposes, reference being made to the attached drawings, wherein:
FIG. 1 is a cross-sectional schematic of a continuous decatizing autoclave provided with the device according to this invention; and
FIGS. 2, 3 and 4 are schematic and partial top plan views of FIG. 1, showing the fabric introduction and withdrawing area, for three different embodiments of the introducing and withdrawing cylinders.
Referring now to the drawing, as in the above mentioned previous patent application, a continuos decatizing autoclave 1 includes a rotating foraminous cylinder 2, preferably lined with a felt (not shown in the drawing), bearing fabric 11 wrapped therearound together with a back cloth 3 which is preferably a substantially thick felt. Fabric 11 is thus subjected to the action of steam under pressure produced inside the autoclave and to a squeezing condition caused by being sandwiched between the back cloths, and in such a way a particular finish is obtained which is typical of this decatizing process. According to this invention, felt 3 and fabric 21 are brought into the autoclave by going through the nip between a pair of rotating cylinders 4 and 5,
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