US2777213A - Supporting and transporting means for web or sheet material in nozzle driers - Google Patents

Description

Jan. 15, 1957 J. DUNGLER 2,777,213

SUPPORTING AND TRANSPORTING MEANS FOR WEB OR SHEET MATERIAL IN NOZZLE DRIERS Filed June 25, 1953 3 Sheets-Sheet 1 I "VF/V r0? .9 UL IE'N film 42154 JVMMJJQ Jan. 15, 1957 J. DUNGLER 2,777,213

SUPPORTING AND TRANSPORTING MEANS FOR was 0R SHEET MATERIAL IN NOZZLE DRIERS Filed June 25, 1953 5 Sheets-Sheet 2 INKF/V 727 6 QuzJ/s/v Don 625g Jan. 15, 1957 J, DUNGLER 2,777,213

SUPPORTING AND TRANSPORTING MEANS FOR WEB 0R SHEET MATERIAL IN NOZZLE DRIERS Filed June 25, 1953 3 Sheets-Sheet 5 OOOGOO 2 9 4 17V VE/VTQ/Q:

.70.; IF Dun 15 United States Patent SUPPORTING AND TRANSPORTING MEANS FOR 5 WEB 0R SHEET MATERIAL IN NOZZLE DRIERS Julien Dungler, Basel, Switzerland Application June 25, 1953, Serial No. 364,125

Claims priority, application France July 2, 1952 7 Claims. (Cl. 34-460) consecutive blowing nozzles in order to expose the product I under treatment to and approach the extreme ends of the nozzles.

This arrangement, however, has certain disadvantages. The supporting rollers partially block the discharge channels and reduce the output of the machine. It has been attempted to remedy this inconvenience, at least in part, by reducing the diameter of these rollers. This reduction in diameter however, entails an increase in the number of revolutions needed to reach a given conveying speed as well as causes the risk that the rollers are subjected to bending in machines of considerable width. Further, the reduction in diameter reduces the area of the surfaces of contact and so increases the risk that the flow of discharge fluid directed transversely to the product under treatment may cause the product to deviate laterally from its path of movement.

It has been attempted to prevent this lateral deviation by arranging the rollers to face a nozzle so that the jets press the product against the roller, but in this case the presence of the roller hinders the passage of the treatment fluid through the product being treated which tends to reduce the efliciency of the treatment.

To remedy the above mentioned disadvantages, the invention contemplates an improved structure for the supporting and conveying rollers which are perforated and located in the discharge channels separating two consecutive blowing nozzles, and which assume the largest diameter attainable within the respective available space in the discharge channel.

According to another characteristic of invention, the discharge channel contains a single roller, the diameter for which is such that it occupies substantially the entire cross section of the discharge channel.

According to a further characteristic of the invention, the blowing nozzles or devices located on both sides of the product under treatment when the two surfaces of said product are to be simultaneously treated, are disposed in staggered relation one to another in such a way that one of the blowing nozzles of the assembly associated with one of the product surfaces is located opposite. to a discharge channel of the assembly associated with the other product surface, this channel containing the rollers according to the invention.

According to another feature of the invention, the length of the rollers substantially exceeds the length of the blowing nozzles, that is to say, the width of the product being treated. 7

According to still another feature of the invention, the

rollers include lateral side-plates joined together by individual longitudinal elements, shaped and spaced in a manner as will ensure appropriate guidance of the product being treated without hindering the flow of the treatment fluid.

According to still a further feature of the invention, the aforesaid longitudinal elements of the rollers are formed of suitably bent strips of sheet metal.

According to another characteristic of the invention, the rollers are provided with lateral side-plates and a perforated envelope formed of lattice work, of perforated sheet metal or in any other suitable manner.

According to still another characteristic of the invention, the longitudinal elements constituting the rollers are braced at points intermediate the length of the rollers.

Further characteristics and advantages of the invention Figure 4 is a section through Fig. 3 taken on line IV--IV of Fig- 3.

Figures 1 and 2 diagrammatically show a part of a treatment machine intended for treating the web material 1, such as of fabric or the like, by the blowing nozzles 2 and 3 located on both sides of the product 1 for treatment.

The individual blowing nozzles 2 and 3 respectively disposed transversely in relation to the path of the product being treated, are separated by discharge channels 2a and 3a respectively, which receive the treatment fluid projected by the nozzles 2 and 3 for impingement onto the product 1 after said fluid has acted on the latter, the discharge of such spent fluid stream being effectuated transversely in relation to the path of movement of the treated product 1.

The treated product 1 is supported and conveyed during its passage through the machine by rollers, shown in Fig. 1 at 4, 5 and 6 in three different forms.

the roller 5 is located in the discharge channel 3a, all the rollers 4, 5 and 6 being constructed to permit passage of treatment fluid therethrough.

According to the invention, these rollers have such a diameter that they practically occupy the entire cross section of the discharge channel in which they are located. It is obvious that the rollers must be constructed in a way as not to hinder the discharge of the treatment fluid. To

this end the rollers shown at 4 comprise lateral side-plates- 7 mounted on a rotatable shaft 8 and longitudinally arranged rods 9 mounted with their ends in said sideplates 7. Bracing elements, such as hoops 10, are provided at intermediate locations lengthwise of the rollers to prevent any distortion of the latter.

To enable the treatment fluid to escape laterally from the discharge channels, the length of the rollers is substantially greater than the length of the blowing nozzles 2 and 3, that is to say, than the width of the treated product 1, as appears clearly from Fig. 2 by the relative position of a side-plate 7 of the roller and the end wall ll'of nozzle 2.

Another form of construction of a roller according to the invention is represented atS, where the roller is composedof lateral rims 12 joined to the shaft 14 by means of spokes or arms 13, the rims 12 being connected by longitudinal strips 15 arranged edgewise. Bracing ele:-

ments may also be provided at intermediate locations of,

One of the rollers 4 is located in the discharge channel 2a, whereas 3 the "length ofthe rollers; the design of the lateral elements forming rims further facilitates the flow of the treatment fluid in axial direction.

Inthe-form of a" roller construction shown 'at i'the lateral or end elements are also 'constituted by jams 12, joined to -the shaft 14 byine'ans of arms 13, butthe longitudinal elements joining the rims 12 are made-from metal strips 16 folded into v for mwith the apicesdi'rected outwardly toward the roller'periphery The rollers describedabove have the following advantages:

"A's appears from Fig. 1; the treated product l is guided a't a mult'iplicity of places which are 'very close' together and spread over the entire length of the 'path described by the product, which assures -s't'lffici'eitit adherence to preventflateral deviationof theproduct from its normal pathduringflow of the treatment' flnid. Despite these numerous areasof contact with the rollers, the contact surfaces are onlyvery small and form fractions of the total surface'of the producfbei'ngtreated, so that the latter is traversedpractically overits'eritire width by jets of treatment fluid delivered by'the' blowing nozzles 2"and"3 and although each roller occupies practically the whole cross section of a discharge channel which'is defined by a U-shaped wall having opposite wall portions terminating in a throat. The rollers in practice do not hinder the flow of treatment fluid, owing totheir particular skeleton construction, each roller projecting with a relative minor peripheral portion beyond the end of the respective U-shaped wall.

As'it further appears from Fig. l, the rollers according to the invention are particularly suitable for the treatment'of products in bands or webs whichhave to be conveyed without tension, as is the case with certain delicate fabrics. In such case, the fabric runs partly coaxial with the rollers, as the fabric'enters intervals existingbetween longitudinal elements 9 constituting the rollersso that thetreatment fluid "ensures at' the same time the desired transport'and the necessary adherence for preventing any lateral deviation due to the direction of flow of the fluid. Finally, it should be noted that the large diameter of these rollers allows the speed of rotation necessary for a specified speed of transport, to be substantially reduced.

'By reasonof the adherence obtained and the spacings existing between the projecting; parts of said rollers, it is possible to increase the slackness of the cloth or fabric on the rollers and between the rollers with a view of augmenting the possibility of shrinkage during drying.

Figures 3 and 4 show twoother forms of'construction- 0f rollers according to the "invention. The roller shown at 17 in channel 2 a comprises the lateral sideplates'18,'- mounted on the shaft 19 and the lattice work or trellis 20 which forms the permeable envelope of the roller reinforcing discS 'ZL'being provided to extend internally-at-'intermediate points of the length of the roller.

In the form of construction shown at 22 (see Fig. 3) the roller in channel3a comprises the side-plates 23 moiinted'ona shaft 24,* and having the en'velope25 of perforated sheet metal.

As it appears from-Figl t; the-lengthof-these rollers is' a'ls'o substantially greater thanthat of the nozzles 2 and-'3. The advantages" of these rollers are the same as those described in reference to Figs. 1 and 2.

'It'isunderstood that the modes of construction described above and shown in the drawings, are given merely bywayof simple, non-limitative examples and it is possible to modify in any convenient manner the shape, the nature, "the disposition and the mounting ofthe parts thereof withoutthereby exceeding the scope of the invention. Moreover, the rollers according to the invention can be employed fbr-the'conveyance of products inthe form of bands or' in the form of sheets or plates 'ofan'y kind,

suchas'of fabiicfpaper, cardlsea'rdand the like. In the t'-shouldbe mentionedthat the whole cross section of a discharge channel.

case-of rollers provided with lateral side-plates joined together by longitudinal elements, the latter can be of any appropriate nature and can be constituted by rods, metal wires stretched in any appropriate manner, thongs or ropes of a non-metallic material but heat-resistant, such as asbestos, certain synthetic rubbers or certain synthetic resins, etc. The bracing elements provided at int'ermedi atelocations of the length of the rollers can also assume-any suitable form. However, when the crosssection of the discharge channel is particularly large, it can receive several rollers, the diameter of which is always comparatively great so as to occupy together practically One end of the rollers can be connected to the 'suction conduit of a fan or blower feeding the blowing nozzles in order to create a suction in the interior of the rollers.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. In supporting and conveying means for producttreating machines having spaced apart blowing nozzles for delivering fluid against one surface of a product in the form of webs, bands, and the like; channels spaced from each other for the discharge of the fluid delivered fromfsaid nozzles after its action on the product, each channel having opposite wall portions, a rotatable shaft in each channel, and a product-supporting skeleton roller on' each shaft provided with a product-supporting sur- 'face "and extending with a relatively minor portion. be-

yond the end of the wall defining the channel in which the rspective roller is located, each roller being of a diani' e'ter'corresponding substantially'to the greatest'distance' between said opposite wall portions of the respective enamel;

2. Supporting and conveying'means for a lengthy producthaving cipposedsurfaces, comprising blowing nozzles spaced from each other and from said opposite surfaces site "surfaces of said product, respectively, and disposed intermediate adjacent blowing nozzles, whereby the blowing nozzles adjacent one surface of the product are disposedopposite the discharge channels arranged adjacent the other surface of said product, a plurality of rotatable shafts extending in substantially parallel direction to said blowingnozzles and disposed in said discharge channels, respectively, and a plurality of supporting rollers for said product rnounted on said shafts and substantially conforming to and reaching almost to the confines'of said discharge channels, respectively, said rollers bein g constructed to permit passage of a fluid through said rollers.

3. Supporting and conveying means for longitudinally moving material to be treated through a treatment zone, comprising opposite rows of blowing nozzles extending in transverse direction to the movement of the material,

'exhaust channel means each terminating in a throat and positioned intermediate each pair-of nozzles of each row, and roller means forsupporting said material when moved past said nozzles along a path defined by the zbnebouncled'by said nozzles of said opposite rows, said roller means being positioned within said exhaust channel meansand being provided with a foraminous surface extending beyond *the throat of said exhaust channel means into said path, whereby said material is engaged by said foraminous surface so' that fluid discharged from said nozzles will impinge upon said material and is thereafter diverted through said foraminous surface of said roller means into said exhaust channel means, said roller means'being shaped as to substantially completely occupy thecrbss-section of the respective exhaust channel means adjacent the throat thereof.

4. Supporting and conveying means according to claim 3, said roller means being of a length suflicient to extend beyond the width of said exhaust channel means.

5. Supporting and conveying means according to claim 3, said roller means including perforated end portions bounding said foraminous surface.

6. Supporting and conveying means according to claim 5, said end portions including radially extending arms providing openings therebetween.

7. In supporting and conveying means for producttreating machines having spaced-apart, transversely extending blowing nozzles for delivering fluid against one surface of a lengthy product in the form of webs, bands, sheets or plates; a plurality of rotatable shafts extending parallel to each other and disposed intermediate adjacent nozzles, a product-supporting skeleton roller mounted on each shaft, and a U-shaped discharge channel in which each roller is disposed, each discharge channel being arranged between and interconnecting adjacent nozzles, each of said channels being provided with an open throat across and beyond which the respective roller extends to support said product and to provide a passageway through which spent fluid coming from said product may pass to the respective discharge channel, the outer surface of each roller approaching the confines of the respective discharge channel adjacent said open throat.

References Cited in the file of this patent UNITED STATES PATENTS 170,712 Clark Dec. 7, 1875 1,997,984 Swan, III Apr. 16, 1935 2,271,347 Runals Jan. 27, 1942 2,301,249 Butterworth et al Nov. 10, 1942 2,439,722 Dreisel Apr. 13, 1948

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