US 2582241 A
Description (OCR text may contain errors)
Jan. 15, 1952 J. DUNGLER DRYING MACHINE FOR FABRICS Filed Aug. 31
8 5 N mm mm O IL L ENVENTQR JULIEN DUNQLER Patented Jan. 15, 1952 DRYING MACHINE FOR FABRICS J ulien Dungler, Basel, Switzerland Application August 31, 1946, Serial No. 694,275 In France May 22, 1946 1 Claim.
My invention refers to drying machines for fabrics which have been subjected to bleaching, dyeing, dressing and like treatments.
The invention has for its object the provision of means facilitating drying of the fabrics freely i. e. allowing during the drying process a uniform shrinkage in the direction both of the warp and of the weft.
As a matter of fact the formation of more or less long fabric folds in mechanical dryers, produces on the one hand an elongation of the fabric under the action of its own weight which is increased by the weight of the water contained therein; on the other hand, it produces an irregular drying by reason of the water accumulating through gravity inside the lower part of the folds of the fabric which requires an extension of the time during which the fabric must remain inside the drying chamber; lastly, there are also produced marks at the point of contact with the bars used for hanging the fabric.
The present invention has therefore as one of its objects the provision of means affording rapid and free drying of the fabric over a limited or predetermined path under regular working conditions; the drying is ensured according to my invention by a flow of hot gases or fluid, preferably blown in the form of jets for instance, by means of nozzles arranged along the path followed by the fabric and throughout its width,
said jets of hot air impinging on the fabric as it passes through the machine.
My improved machine is characterized in particular by the fact that with a view of allowing free shrinking, during the drying of the fabric, in the direction of the warp and of the weft, said machine is designed to form for the passage of the fabric, a narrow space which is defined, on the one hand, by opposite nozzles blowing the drying fluid arranged throughout the width of the fabric and over a part of its path through the machine, and on the other hand, by conveyor means advancing through a continuous translational movement and against the carrying surface of which the fabric is urged by the fluid blown on to it so that the fabric may be carried along freely throughout the length of the narrow space thus defined, said conveyor means being disposed in such manner that a constant spacing in regard to the nozzles is maintained.
In order to allow my invention to be better understood, I will describe now by way of example and by no means in a limltative sense, a preferred form of execution thereof which is illustrated diagrammatically in the accompanying drawing and wherein:
An elevational view of a horizontal machine with straight and parallel drying elements is shown a wall of the housing of the machine being removed to expose the inside thereof.
The embodiment shown in the drawing according to which the fabric moves through the machine along a rectilinear path, comprises, within the frame or casing I, two or more similar drying units 35 with extensions l3 terminating in air blowing nozzles I 4 located at either side of the path of the fabric a and extending throughout its width. l
The arrangement is such that the ports or slots l5 of the series of nozzles M of the upper units 35 are located in front of the slots or ports l5 of the series of nozzles 14 of the lower units 35, the distance left between said two opposite series of nozzles defining a narrow space allowing the free progress of the fabric a.
Each of the drying units 35 includes a blower system 36 for producing hot compressed air which is sent through the nozzles [4, said units being shaped in a manner similar to the drying elements with preferably telescopic nozzles as described in my prior French Patent 856,315 allow-'' ing also exhaustion of said air when discharged from said nozzles.
The free passage afforded for the fabric a through the narrow space left between the two superposed series of nozzles I 4 of the units 35 is ensured through two endless belt conveyors 25 holding the fabric between them as it enters at 3B the casing i, said conveyors guiding it thereafter through the narrow space mentioned until it leaves the case at 3|.
The upper and lower conveyors 25 are driven over their respective turning rollers 26 and may be constituted by endless strips of perforated fabric or of metal sheet or else by sheets of endless strings arranged in parallelism and held at a constant spacing, said strings passing through annular grooves provided with a suitable spacing at the periphery of the rollers 26.
The narrow space provided between the nozzles and said rollers 26 is sufflcient to allow a free passage for an endless belt conveyor 25 which, inside the casing or housing, is guided by a number of turning rollers 26 of which one 26 is located on? the outside of the casing, on the side facing the inlet 30 of the fabric a, and is submitted to the action of a spring 21 so as to ensure an equal and constant tension for the endless belt 25 at the same time as it cooperates with the first roller located inside the casing. The portion of the belt within said space forms a feed apron for the fabric, fed by draw-in rollers 26, at a variable speed, which latter rollers are preceded by a selvage rollers-guide 29.
The continuous progress of the conveyor 25 is ensured by a certain number of rollers. The inlet and the outlet of the fabric a into and out of the housing is performed through slots 30 and 3|, the treated'fabric being finally guided to drawing rollers 32 associated for winding or for folding of the fabric at 33.
In view of this arrangement and during the rectilinear advance or progress of'the fabric (1 held between two conveyors 25 in the narrow space defined by the two series of nozzles of the upper and lower drying units 35, it is apparent.
that the fabric is suspended simultaneously on the one hand, against the upper conveyor through the blowing action of the series of nozzles IA of the=lower heating element, and on the otherhand, against the lower conveyor under the action of the blowing of the series of nozzles. M of the upper heating unit, which means a free passage of thefabric through the narrow space-bounded by the cooperating seriesof blowing nozzles without any contact therewith.
From-the above, itisapparent' that in the drying-.machine forming the object of my invention, the fabric a is submitted asit progresses through anarrow space to a drying operation through-blowing of-hot air while remaining, always free to shrink both longitudinally and-transversely.
It can thus be seen that there has been provided in'accordance with the present invention a drying machine for treating lengthy fabric and similar sheet andweb-material, comprising a heat-insulated housing having an inlet and an outletfor said material, two horizontally extending substantially parallel and spaced apart casings extending betweensaid inlet and saidoutlet, saidmcasings being provided'with opposedly arranged spaced nozzles'facingeach other, means for blowing air or other fluid through said ncz' zles and-connected to said casings, respectively, heating'means for said flu-id, endless perforated flat belt means spaced from each other and conducted within the space between said nozzles for guarding said material, said material being maintained in a substantially floating and suspended state-'betweensaid belt means when saidflu-id impinges through said belt means upon said ma- 4 terial, and means without said housing for regulating tension of one of said belt means, whereby contact of said material with said nozzles is prevented.
Having thus described the invention what is claimed as 'new and desired to be secured by Letters Patent, is:
A drying machine for treating lengthy fabric and'siinilar sheet and Web material, comprising aheat-insulated housing having an inlet and an outlet or said material, two horizontally extending substantially parallel and spaced apart casings extending between said inlet and said outlet, said casings being provided with opposedly arranged spaced nozzles facing each other, means for blowingairpthrough said nozzles and connected to said casings, respectively, heating means for said air, endless perforated flat belt means spaced from each other and conducted within the space between said nozzles for guarding said material,- said material being maintained. in a substantially heating and suspended state between said belt means when said air impinges through the latter upon said material, and means Without said housing for regulating tension of one of said belt means, whereby the latter prevent contact of said material with said nozzles.
REFERENCES CITED The fol-lowing references are of record in-the file of this patent:
UNITED STATES PATENTS Number Name Date 835,843 Baetz Nov. 13, 1906 873,723 Cohen Dec. 17, 1907 3,426,995 Parker Aug. 15, 1922' 1,595,855 Bleiifil Aug. 19, 1924 1,511,400 Daly Oct. 14, 1924 1,575,366 Johnson Mar. 2, 1926 1,715,830 Glinka June 4, 1929 1,779,611 Merrill Oct.28, 1930 1,951,004 Willis Mar. 13, 1934: 1,996,020 Hurxthal Mar. 26, 1935 2,078,292 Smith Apr. 27, 1937 2,189,915 Mellor Feb. 13, 1940 FOREIGN PATENTS Number Country Date 15,107 Great Britain Dec. 31, 1909 430,909 Great Britain June 24, 1935 856,315 France Mar. 18, 1940