US 2601080 A
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June 17, 1952 J. R. ANDREWS, JR 2,601,030
METHOD AND APPARATUS FOR DRYING WARP SHEETS AND THE LIKE Filed Oct. 20, 1949 2 SHEETS SHEET 1 mm LLL L Tici- "TTOFHTYS June 17, 1952 J. R. ANDREWS, JR 2,601,030
METHOD AND APPARATUS F OR DRYING WARP SHEETS AND THE LIKE Filed Oct. 20, 1949 2 SHEETS-SHEET 2 B Y eff ay 1%??? f ATTORNEYS Patented June 17, 1952 METHOD AND APPARATUS FOR DRYING WARP SHEETS AND THE LIKE John B. Andrews, Jr., Uxbridge, Mass., assignor to Bachmann Uxbridge Worsted (30., Inc., Uxbridge, Mass., a corporation of Massachusetts Application October 20, 1949, Serial No. 122,482
This invention relates to method and apparatus for drying warp sheets and the like.
It relates to an air drier of the type disclosed in copending application Serial No. 25,565, now Patent No. 2,541,383, and discloses improvements upon the method and apparatus disclosed in that application.
In the use of apparatus of the kind disclosed in said copending application I have found that air directed against the lateral margins of a sized warp sheet tends to flow outwardly, around the edges of the warp sheet, instead of through its lateral margins, thereby causing the margins of the warp sheet to roll. This is objectionable because it results in uneven drying of the warp sheet and because it causes the lateral margins of the warp sheet to roll with the result that the sized threads comprising the marginal portions of the warp sheet are brought into contact with one another and tend to stick together.
An object of the invention is to provide a method and means for drying a warp sheet uniformly throughout its width.
Another object of the invention is to provide method and means for drying a warp sheet without rolling the lateral margins, and without setting up vibratory action or flutter in the warp sheet.
Other objects of the invention will be in part obvious or in part pointed out hereinafter.
The invention accordingly consists in the features of construction, combinations of elements, arrangements of parts, and in the several steps and relation and order of each of said steps to one or more of the others thereof, all as will be pointed out in the following description, and the scope of the application of which will be indicated in the following claims.
The invention will best be understood if the following description is read in connection with the drawings, in which,
Figure 1 is a side elevation partly in cross section, with some parts broken away;
Figure 2 is a perspective view showing in full width a portion of a header surface;
Figure 3 is a vertical section taken on line 3-3 of Figures 2 and 4; and
Figure 4 is a vertical section taken on the line 4-4 of Figures 2 and 3.
While applicable to headers of various shapes and applications my improvements are illustrated and applied herein to the type of air drier disclosed in detail in said co-pending application Serial No. 25,565. It comprises a housing In, which contains an air header I2 having an air discharg- 7 Claims. (Cl. 34-23) ing surface Hi, and the header i5 having the air discharge surfaces [8 and 20. A warp sheet to is led into the closure l0 after being sized in vessel 22, and preferably after having been split into a plurality of warp sheets by the splitter roll 24, and is passed through a long reach, in close proX- imity to surface M of header [2, to the roller 25'. From the roller 24' it passes over the air distributor surface I8 of header It; to roller 25, below the lower end of header l6, and from roller 26 it passes over the air distributing surface 20 of header is to roller 28, and then back to and around roller 30 adjacent the bottom of the closure, and from which it passes out of the closure in the direction indicated by the arrows 32 (Figure 1) through port 34 adjacent the bottom of the closure. From roller 30 to port 34 the warp sheet is moving in opposition to an incoming stream of air which flows through port 34, through heating means 36 and baffle means 38, which as illustrated comprises a number of bafiles operated by solenoid means which need not be further referred to herein as they form no part of the invention which is the subject of this application; through baiile means 40, heater 42, and fan member a l by which it is impelled through port 35 into the interior of header !2, and through the air distributing members 4! to the discharge surface M of header [2.
The air issues from the ports in the discharge surface substantially evenly and with a gentle non-turbulent flow due to the employment of baffie means which are referred to hereafter, and which are disclosed in detail in said co-pending application Serial No. 25,565, and after passing through the warp sheet is drawn into fan 48 and expelled through the duct 59 in the direction of the arrows into header l6, being discharged through both surfaces It and 20 of header l5 through the reaches of the warp sheet which pass over said surfaces respectively as has been described. The air discharged through surfaces 18 and 20 of header I6 is drawn into fan 44 and reheated and recirculated together with new air supplied through port 34 which replaces air discharged through outlet port 48 which it will be observed is positioned above the lower end of header l2 to exhaust the portion of the air which has passed through the warp immediately after its entrance into closure l0 and while it is in its wettest condition.
It will be understood that the number and disposition of the air headers employed, and the flow of air between the headers, after passing through the reach or reaches of the warp sheet, form no part of this invention which is directed to improvements in the control of air flow between a header discharge surface and the reach of the warp sheet which passes over said surface.
A shown herein each of the air discharg sur faces comprise laterally extending air slots so which extend across the path of a warp sheet and are disposed at right angles to the path of the warp sheet in spaced, substantially parallel relation.
The air slots 50 are defined by lips or projecting flanges 50 and 50 (Figure 4) extending the full width of the slot and projecting outwardly from the surface of the header toward the path of the warp sheet. Extending over the open 'mouthor nozzle 52 of each air slot 50 is a u-shaped deflectcr 54 of the type disclosed in said co-pending application Serial No. 25565, against which air strikes upon leaving the said mouth 52. Baffie 54 reverses the direction of flow of air from the slot 50, dividing it and directing it back toward thehead'er surface between slots or ports 50, but the resulting 'ai'r streams are again directed outwardly toward the warp sheet by means of baffles 55 projecting from the surface of the header between adj acent-air'slots 50.
While this ba file and deflector means, as Well as the bafiiemeans shown in Figure 3 of said copending application Serial No. 25,565, i of great utility and effectiveness in eliminating turbulence in the air stream and in providing a flow of gentle air against a warp sheet, nevertheless it has been found in many instances, as for example where the sizing tends to bridge over between adjacent threads of a warp sheet, that the air which is discharged from the end portion of the air slots 50 may tend to flow sidewise around the lateral margins of the warp sheet, thus causing under drying of the lateral margins of the w'arp sheet.
To overcome this difficulty I close the ends'of the air slots 50 if they are not already closed by th -sides of the header as shown 'herein, and provide the air intercepters 60 and '62 extending lengthwise of the header'a'djac'ent its lateral margins, preferably with the outer ends of the intercepters extending toabout from the path of the warp sheet and disposedlaterally about 1'' beyond the margins of the warp sheet. However, it is not sufficient to employintercepter til and 62 alone because of the vibration or flutter which is then set up in the warp sheet travelling over the header surface, and is harmful since it tends to stretch the threads comprising the warp sheetmargins more than those at the center of the warp sheet thus rendering the warp sheet non-uniform. I have found, however, that by providing additional intercpters, such 'for example as 64, 66 and 68 positioned inwardly of, and in substantially parallel relation to intercepter 60, at spaced intervals under a warp sheet margin and intercepters such as 10, T2 and M in substantially parallel relation to inter cepter -62, at spaced intervals inwardly from-intercepter 62,the vibration or flutter is substantially eliminated.
Good results have been obtained with the intercepters spaced about two inche apart, starting from the outside-intercepters 60 and 62 positioned with their outer ends about one inch beyond the lateral margins respectively of the warp sheet and approximately three-quarters-of an inch from the'plane of the warp sheet. 7
The extreme marginal intercepter members-60 and'62 may be angular members having portions and 62 respectively, overlying and covering the extreme marginal areas respectively of the header surface, especially if the Warp sheet is substantially narrower than the Width of the header surface. I have found it desirable to extend the intermediate intercepters 64, 66, 68, 69 and '10, 72, 73, 15 into the air slots 50, and thus below the level of the tops of the deflectors 54 and into the plenum chamber of the header. Thus the intercepters may be formed with the projecting tongues 15 adapted to be inserted between adjacent baffles 54 and to extend well down toward the top of the baffles 55.
I have found that the exact inclination of the marginal air-deflecting members 60, 62 and of the members 64,156, '68, F69 and 10, l2, l4, 15, may be best determined bytrial and error for each header surface and for eachof said members since slight variations occur in manufacture in the height or spacing of the air discharge nozzles 59 and baflles 54 and 56 and in the volume of air delivered through the several air slots. After having determined the optimuminclination for'each'theintercepters may be 's'ecured in place in any suitable Wayas for example by Welding to the tops of the bafile members-54.
By the steps and apparatus disclosed herein a drying action is obtained which is satisfactorily uniform throughout the full width of the warp sheet, and'the'difiiculties of inward rolling of the edges of the warp sheet, or vibration or flutter of the warp sheet are substantially eliminated.
It will thus be seen that there has been provided by this invention a method'and apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are-successfully achieved. As various possible'embodiments might be made of the mechanical features of the above invention and as the art herein describedmig'l'itbe varied in various parts, all without departing from the scope of the invention, it-is to be understood that all matter hereinbefore set forth or shown in the'accompanying drawings is to be interpreted as illustrative-and not in a limiting sense.
What I claim-is:
1. An air distributing header for drying Warp sheets and the lik havin a plurality of substantially parallel air discharge slots including baffle means extending over said slots in the direction of the path of a Warp sheet, to modify the flow of air from said slots, and deflector members projecting outwardly from said bafile members over the lateral margins of said air slots respectively to intercept the "air from 'a'dj'a'cnt the l'ateral'margins'of the slots "and direct it to pass through the lateral margins respectively "of the warp sheet and minimize new or the air laterally ar'oun'd'the edges of the'wa'rpsheet.
2. The'device as claimed in claim 1 wherein a number of said defiector-meinbers'are provided extending over the margins of said air slots -a'nd disposed in spaced substantially parallel relation to one another and substantially at right angles to said slots.
3. The device as'claimed in claim l'in'w'hich there is one air deflecting membe'rpositioneddn substantial alignment with each extreme'lateral margin of said air slots to intercept air circling around the edge of the warp sheet'and to direct said air through the adj acentlateral margin of said warp sheet, and other-air deflecting=memhers-are disposed inwardly from said marg-irial air deflecting members at spaced intervalsaand 5 substantially parallel with the said extreme marginal air deflecting members.
4. The method of drying a warp sheet which comprises moving the warp sheet across and substantially at right angles to a flow of substantially non-turbulent air, and confining and directing the air flow to prevent the extreme lateral portions thereof from flowing around the lateral edges of the warp sheet, and directing air against the warp sheet along lines substantially parallel to the edges of the warp sheet at spaced intervals from the lateral margins of the warp sheet to avoid flutter in the warp sheet.
5. The method as claimed in claim 4 which includes the step of intercepting and deflecting inwardly air directed toward said Warp sheet at a plurality of spaced intervals from the lateral margins respectively of the warp sheet, to prevent rolling of the extreme lateral margins of the warp sheet and to prevent flutter in the warp sheet.
6. An air distributing header having a surface adjacent and parallel to the path of a warp sheet, air ports in said surface extending laterally of said header through which air from the header is discharged toward the warp sheet and substantially at right angles thereto, marginal air deflecting members extending at right angles to said air ports along its lateral margins respectively, and toward the path of a warp sheet, and additional air deflecting members positioned inside but adjacent to said marginal members, and substantially parallel to said marginal members and adapted to deflect air inwardly from the REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,357,314 Cobb Nov. 2, 1920 1,945,851 Freeland Feb. 6, 1934 2,141,403 Ofien 1- Dec. 27, 1938 2,152,238 Bridges Mar. 28, 1939 2,282,946 DeRoo May 12, 1942 2,426,415 Rose Aug. 26, 1947