US2932903A

US2932903A - Dryer unit for yarn slashers

Info

Publication number: US2932903A
Application number: US561383A
Authority: US
Inventors: Ball Gaines Lamar
Original assignee: BATSON COOK Co
Current assignee: BATSON COOK Co
Priority date: 1956-01-25
Filing date: 1956-01-25
Publication date: 1960-04-19
Anticipated expiration: 1977-04-19

Description

April 19, 196() Filed Jan. 25, 1956 G. L` BALL DRYER UNIT FOR YARN SLASHERS 3 Sheets-Sheet l IN VEN TOR. GAM/[5 .LA/M41? LL ATTORNEY April 19, 1960 G. BALL 2,932,903

DRYER UNIT RoR YARN sLAsRRRs Filed Jan. 25, 1956 3 Sheets-Sheet 2 INI/EN TOR.

GAM/5 AM/4P LL ATTOPNE Y April 19, 1960 G. l.. BALL 2,932,903:

' DRYER UNIT F OR YARN SLASHERS Filed Jan. 25. 1956 Y 3 Sheets-Sheet 3 IN VEN TOR.

A TTOR/VE Y 2,932,903 Patented Apr. 19, 1960 DRYER UNIT FOR YARN SLASHERS Gaines Lamar Ball, West Point, Ga., assignor to Batson- Coni: Company, West Point, Ga., a corporation of Georgia Application January 25, 1956, Serial No. 561,383 4 Ciaims. (Cl. 34-159) This invention relates to a dryer unit 'for yarn slashers, and is particularly concerned with a hot air dryer in which the moist size bearing yarn is subjected to contact with moving air at an elevated temperature which dries the yarn after its passage through the sizing unit of the Slasher.

Slasher units in which starch, glue or like sizing material is applied to yarn for its protection during the weaving operations have conventionally been provided with dryer units by which the moisture of the sizing material is removed to deliver a dry sized yarn. Such dryer units have frequently been of the hot air variety in which the yarn is moved usually through a tortuous path and during which movement it is subjected to blasts of hot air. Difficulties have an'sen in the use of such apparatus in that the air is usually directed against the yarn perpendicularly or at anV angle and in such movement there is considerable turbulence leading to breakage and entanglement of the yarn threads. Such impingement of the hot air also impedes the progress of the yarn requiring a high tension and stretch of the yarn in its travel through the dryer and such stretch and tension is undesirable. It has also been noted that in hot air dryers heretofore used for the present purpose difficulties have arisen with respect to maintenance of the uniform drying operation throughout the relatively broad width of the sheet of yarn passing through the dryer. Additionally, the dryers heretofore provided for the present purpose have frequently been of relatively low thermal eiciency and hence the drying operation has been equivalently high in cost.

It is, therefore, among the primary objects of the present invention to provide a novel and improved hot air dryer for slashers which is simple in construction, ellicient in operation and which provides for a minimum of air turbulence and a uniform drying of the yarn passing therethrough.

A further and more specific object of the present invention is to provide a dryer of the type referred to in which the passage of air is directed against the yarn in the direction of yarn travel and thus minimizes agitation and tangling of the yarn.

Another object of the present invention is to provide a Slasher hot air drying unit in which a high thermal eiiiciency is maintained by virtue of the recirculation of at least a portion of the heated air which contacts the yarn for the evaporation of the sizing material thereon.

It is also an object of the present invention to provide a dryer so constructed and arranged as to minimize the tension required for moving the yarn through the dryer and hence relieves the yarn of undue stretch in such passage.

The objects of the present invention also include that of providing a single, simple enclosure yfor the tortuous path of the yarn and the co-extensive path of the heating medium which provides minimum open vents `by which the flow of air would be discharged causing turbulence and ineliciency as well as inhibiting uniform drying operations.

Numerous other objects, features and advantages of the present invention will be apparent from a consideration of the following specification taken in conjunction with the accompanying drawings in which:

Fig. l is a side elevation of one preferred form of the present dryer with the side wall of the enclosure broken away.

Fig. 2 is an end elevation of the dryer of Fig. 1.

Fig. 3 is a perspective view of the 4internal structure of the present dryer.

In general terms, that form of the invention which is here presented by way of example may be characterized as including a tortuous return arrangement of air ducts to which air is supplied through power means and which include heating elements to elevate the temperature of the air supplied. Throughout the ducts yarn supporting and directing rollers are provided by which yarn may be fed through the machine centrally of the ducts and in the direction of the air travel and hence there is no perpendicular or angular impingement of the air against the `yarn in its travel, thus turbulence is minimized and resistance of the yarn movement is likewise minimized so as to avoid unnecessary tension and stretch. An important feature of the invention is the provision of air directing vanes at the points where the ducts are angularly disposed so as to preclude turbulence and insure uniform straight movement of the air in the direction of the yarn travel. It is also an important feature of the present invention to provide `for the return circulation of at least a part of the air supply to the blowers and thus maintain a high thermal efficiency whereby the cost of operation is minimized.

Referring more particularly to the drawings, it will be understood that the structure of the present form of the invention is preferably mounted within a general rectangular housing indicated by the numeral iti in Fig. 1, the housing being broken away to more appropriately disclose the internal mechanism of the device. The housing 10 preferably of sheet material is generally imperforate in order to preclude undue turbulence or lossof Y the heated drying air but is provided at the entrance rear wall with an elongate slot like aperture lll for the reception of the sheet of yarn from the usual size box of the Slasher, the entrance sheet being indicated by the numeral 12. On the opposite wall of the housing 16 a similar slot 13 is provided from which the dry sheet of yarn indicated at 14 is delivered at the front delivery side of the housing. The front side at the top and bottom is also provided with louvered air admission top and bottom openings 15 and 16, respectively, by which air is admitted for delivery by the upper and lower blowers `17 and 18respectively to

top andbottom ducts

19 and 20, respectively. As will be hereinafter pointed out, air from the internal ducts is also admitted to the fans through upper and lower

louvered openings

21 and 22 whereby the air is re-circulated in order to improve the thermal efficiency of the apparatus. The lower duct 2d leading from the blower 1S extends the full length of the heater land is provided at 23 with heat exchange tubing by which the air delivered from the blower 1S is elevated in temperature. The duct 2u opens at 24 to deliver the heated air to the central yarn admission duct 25 communicating with the opening 11 and extending forwardly to a forward return baffle 26.

An important feature of the present invention is the provision at the points of air turning of angularly directed vanes by which the air is directed in the desired direction of travel, thus to minimize danger of turbulence `as the air passes through the device. Thus at the delivery strands thereof.

end of the duct 20 two sets of angularly disposed vanes 27 and '28 are provided, the vanes Z7 direct the air from the duct 20 vertically upward towards the central duct 25 while the .vanes 28 direct the air forwardly in the duct 25 and hence in the direction of travel of the yarn ilight 3i) which is moving from theV entering slot 11 toward the discharge slot 13. in a similar manner, the upper duct l? receiving air from the blower 17 has a downwardly directed right angular extension 31 with vanes 32 assisting in the direction of the air in its passage fat the right angular corner to avoid turbulence at that point.

In the vertical passage 3i heat exchange tubing 33 is provided whereby the air is raised to the desired ternperature for delivery through the guide vanes 34 disposed in opposed 4fashion to the vanes 28 thereby the air from the upper blower i7 is delivered to the lower duct 25 and is directed Vin the direction of travel of the yarn in such duct.

At the forward end of the duct 25, upwardly directing guiding vanes 36 are mounted on either side of the end roller 37. The vanes 36 direct the moving air vertically upward from the duct 25 to a lower intermediate duct 57, the passage of air being parallel with ba-le 26. At

the entrance end of the duct 57 angularly arranged vanes 38 are provided as well as a yarn roller 39 so that the yarn flight 3i) after passageover the rollers 37 and 39 will be rearwardly directed through the duct 57 in a flight indicated by the'numeral 40, the air being directed from its vertical path at the baffle 26 rearwardly in the duct 57 by the vanes 33, thus maintainingthe uni-directional flow of yarn and air in the duct 57.

In similar fashion, the end of the `duct 57 is confronted by a vertical baille 41 which is a counterpart of the vertical batlle 26. At the terminal end of the duct 57, vanes 42 and i3 are provided in the manner of vanes 36 and 3S to direct the air flow iirst upwardly then forwardly in the upper intermediate duct 44. Rollers `45 and 46 are provided in the manner of the rollers 37 and 39 to guide the yarn first vertically upward between ducts 37 and 44 and then forwardly in a liight 47 through the upper intermediate duct 44. Adjacent the forward end of the duct 44 exhaust ports Sil are provided on either side of the flight 47 of the yarn whereby a fraction of the drying air may be discharged, it being understood that the admission of air through the ports 15 and .16 to the blowers will be so regulated as to compensate for the fraction of air discharged through the ports Sti. Also at the forward end of the Iduct 44, there is provided the vent 2l leading to the fan 17 by which some of the circulated air is returned for recirculation through the ducts of the system.

From the upper intermediate duct dri, the air is directed by vanes l downwardly in a vertical discharge duct 52, the yarn passing over a roller 53 to move in the direction of travel of `the air in the duct 52. Near the bottom of the duct 52, the yarn discharge slot 13 is formed adjacent which a yarn roller 54 is provided by which the downwardly iiight 55 of yarn in the duct 52 is directed outwardly to the discharge flight 1d. lt will also be notegd that at the lower end of the duct 52 the vent 22 for the lower lower 17 is provided so as to cause a recirculation. Thus, part of the air passing downwardly in the duct 52 is admitted to the fan A17 for recirculation and hence a minimum of air is exhausted with the yarn through the discharge slot 13.

From the foregoing, it will be seen that in the present invention, means are provided for directing the air in straight rectilinear paths, co-extensive with the travel of the yarn and hence there is a minimum of perpendicular and angular impingement of the air against the yarn which would produce agitation and entangling of the It will also be noted that the invention provides for a recirculation of a portion of the air and hence for a high thermal efciency for the apparatus. It will further be noted that since the air travel is in the di- 4 i rection of the yarn travel the yarn is not retarded by adverse air ilow and hence the tension required for carrying the yarn through the tortuous passages formed by the ducts is minimized and und'ue stretch is not applied.

In the operation of the device it is deemed preferable to provide for a 'speed of air travel in excess of the speed of yarn travel. It will of course be understood that the invention is not limited nor restricted to the specic duct arrangement here shown or to the mounting and location of the air directing vanes and/ or the heating coils. Hence 'in the practice of the invention, numerous changes, modiiications and the full use of equivalents may be resorted to without departure from the spirit or scope of the invention as outlined in the appended claims.

l claim:

l. A. yarn dryer including a housing, a central duct, top and bottom air inlet ducts in said housing at the top and bottom thereof respectively for directing air tothe vcentral reverse air ow duct, said central duct being above and adjacent to said bottom inlet duct, upper and lower intermediateair liow ducts adjacent each other and located between and contiguous with the upper inlet duct and the central duct for conducting air from said central duct, means for passing yarn through said central ,and intermediate ducts in the direction of travel of saidair, means'in said inlet ducts for heating air owing therethrough before delivery thereof to said central duct together Vwith blowers Vfor forcing the flow of air through said ducts, and means for recirculatingair through said central and intermediate ducts, said last mentioned means including a vertical duct connecting the upper inlet duct with the central duct.

2. A yarn dryer including a housing, a central duct, top and bottom air inlet ducts and said housing at the top and bottom thereof respectively for directing air to the central reverse air iiow duct, said central duct being above and adjacent to said bottom inlet duct, upper and lower intermediate air ow ducts adjacent each other and located between and contiguous with the upper inlet duct and the central duct for conducting air from said central duct, means for passing yarn through said central and intermediate ducts in the direction of travel of said lair, means in said inlet ducts for heating airowing delivering heated air from said inlet ducts to said lower horizontal duct, a lower intermediate duct, adjacent to :and parallel with said lower horizontal ducts interconnecting means for delivering heated air from said lower horizontal duct to said lower intermediate duct, an upper intermediate duct adjacent to and parallel with said lower intermediate duct, interconnecting means for delivering air from said lower intermediate duct to said upper intermediate duct, meansV including an interconnecting vertical duct for recirculating air from said upper intermediate duct to said air inlet ducts at the top and bottomr of said housing, and means for passing yarn through the lower horizontal and the upper and lower intermediate ducts.

4. A yarn dryer including a housing, upper and lower air inlet ducts at the top and bottom of said housing,'a lower horizontal duct adjacent to and parallel with said air inlet duct at the bottom of said housing, interconnecting means for delivering heated air from said inlet ducts to said lower horizontal duct, a lower intermediate duct adajcent to and parallel with said lower intermediate aeeaeoe duct, interconnecting means for delivering heated air from said lower horizontal duet to said lower intermediate duct, an upper intermediate duct adjacent to and parallel with said lower intermediate duct, interconnecting means for delivering air from said lower intermediate duct to said upper intermediate duct, means including an interconnecting vertical duct for recirculating air from said upper intermediate duct to said upper and lower air inlet duct, means for feeding yarn through said lower intermediate duct and then through said upper intermediate duct in the direction of travel of said air, and means for passing yarn through the lower horizontal and the upper and lower intermediate ducts.

leterenees Cited in the le of this patent UNTED STATES PATENTS Becker Apr. 4,

Bratkowski Aug. 30,

Wheller Oct. 6,

Anderson Dec. 1,

Morrill Dec. 4,

FUREIGN PATENTS Great Britain June 17,

Germany Jan. 29,