Drying and gas or vapor contact with solids – Apparatus – Sheet – web – or strand
Patent
1995-02-17
1997-04-15
Sollecito, John M.
Drying and gas or vapor contact with solids
Apparatus
Sheet, web, or strand
34644, F26B 900
Patent
active
056198086
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for blowing air at a spread-out, continuously transported length of textile fabric with the aid of an optionally heated treatment gas, flowing in accelerated fashion toward the length of fabric, and with blow-out nozzles disposed on one or both sides of the surface of the length of fabric and aimed at the length of fabric, particularly in a tentering frame or a hot flue in the textile industry, wherein an injector is provided to accelerate the treatment gas.
For drying and/or fixing lengths of textile fabric, convection drying and/or fixing machines are used. Conventional examples are a nozzle tentering frame (flat dryer) or a hot flue (loop dryer), in which heated air is blown continuously--flat (tentering frame) or in loops (hot flue) from hole- or slit-type nozzles onto the length of fabric being transported that is to be treated. Such a machine usually comprises a plurality of fields connected one after the other, through which the length of fabric to be treated must be passed continuously, over rollers or over screen belts and/or pinned or fastened by the long edges, guided by chains or passing in loops over rollers.
In the tentering frame, every field, which is approximately 3 m long, for instance, conventionally has at least two recirculating air fans in the transport direction of the fabric, and generally per fan one blower or nozzle chest pointing toward the top side of the length of fabric and one toward the bottom side of the fabric (generally in the form of outlet slits with nozzle prongs extending transversely to the transport direction of the fabric), with blowout nozzles, so-called slit- or hole-type nozzles, embodied as blow-out holes. The blower chests are assigned to the recirculating air fans. They aspirate the blown-out air--after it has performed work at the fabric--back into circulation via heat exchangers, direct heating or the like. In the hot flue, the blow-out nozzles, namely outlet slits of the blower chests, are aimed at the loops.
With this kind of known machine a length of fabric, spread out and guided, can be treated from a thickness of only a few tenths of a millimeter; however, the heating and air acceleration systems--especially in a tentering frame need so much room that the height of this machine measured vertically to a horizontally guided length of fabric is generally on the order of 2 m.
Another problem of conventional apparatuses of the type generically described at the outset, especially in the tentering frame, is that the spacing between the air outlet openings toward the fabric to be treated of the blow-out nozzles and the surface of the fabric must often be greater than would be desirable from an optimal outcome of treatment, and especially drying performance, because there is a need to displace not only the length of fabric but also its chain guides, which engage the long edges of the fabric, back and forth in accordance with the width of the fabric between the blower chests or nozzle fields disposed above and below the fabric to be treated.
The result is the disadvantage that the nozzle fields of the blower chests aimed at the fabric cannot perform any work in more or less wide edge regions of the fabric--for instance in the tentering frame--except when treating a length of fabric that is the maximum width for the given machine. In those edge regions, the treatment air is either blown out uselessly, or the nozzle openings are closed in some way in the peripheral strips in question.
German Patent 596 657 describes an apparatus for drying moving lengths of textile fabric in which the lengths of fabric are guided in a horizontal zig-zag through the drying chamber. To enable operating the known apparatus without a fan, the supply line and outgoing line for dry air are embodied in injectorlike fashion, and suction connections at the drying chamber are provided, in such a way that through the air supply line some of the blown-in air can be reaspirated, and through the outgoing air line cooling air can be passed through the lower
REFERENCES:
patent: 3099291 (1963-07-01), Schlecht et al.
patent: 4292745 (1981-10-01), Caratsch
patent: 5201132 (1993-04-01), Jacob
A. Monforts GmbH & Co.
Gravini Steve
Sollecito John M.
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