US3392267A - Heating unit for fiber stretching installations - Google Patents

Heating unit for fiber stretching installations Download PDF

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Publication number
US3392267A
US3392267A US470664A US47066465A US3392267A US 3392267 A US3392267 A US 3392267A US 470664 A US470664 A US 470664A US 47066465 A US47066465 A US 47066465A US 3392267 A US3392267 A US 3392267A
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Prior art keywords
heating
steam
boxes
aperture
pipe
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Expired - Lifetime
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US470664A
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English (en)
Inventor
Bosch Hugo
Kegel Werner
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Vickers Zimmer AG
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Vickers Zimmer AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/001—Drying and oxidising yarns, ribbons or the like
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/222—Stretching in a gaseous atmosphere or in a fluid bed
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/224—Selection or control of the temperature during stretching
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • D02J13/001—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass in a tube or vessel

Definitions

  • a synthetic fiber heating apparatus for continuous fiber stretching including an enclosure wherein a treatment chamber is defined between two vertically-spaced, rigid, heating boxes Which are supported to be freely movable to compensate for thermal stresses.
  • a longitudinal horizontal aperture in one well of the enclosure provides access to the treatment chamber.
  • heating fluid is provided for the heating boxes.
  • steam heating may be provided by a steam spray pipe arranged in the enclosure. Fibers move horizontally through the chamber.
  • a bafile plate is provided between the steam pipe and the fibers to direct steam above and below the fibers.
  • the invention relates to an apparatus for maintaining a controlled heating zone in which synthetic fibers may be stretched subsequent to polymerization and spinning.
  • a double-walled heating body having on one side an aperture of circular or oval cross-section.
  • Such aperture is used to introduce material to be stretched into the heating chamber.
  • the hollow chamber of the heating unit is filled with a heating fluid, for example, with diphenyl, which is usually heated to the working temperature by an electrical resistance heating system.
  • the temperature of the system depends on the requirements of the material to be stretched and may be, for example, in the range of 200 to 230 C.
  • spray tubes are arranged above and below the material to be stretched.
  • Known heating units have the drawback that, during operation, considerable thermal stresses develop in the walls and supporting connections, which cause deformation and warping especially near the periphery of material-introducing aperture. Deformation and warping varies in degree over the length of the heating unit, which generally is several yards long. Due to the irregular dimensions of metal surrounding the apertures, severe deviations in aperture cross section also occur as the unit changes temperature. There also exists the problem of introducing into the heating unit material in the form of narrow, fiat thread cable composed of many minute threads, called capillaries, which are difficult to handle.
  • a further problem with respect to design of heating units involves the disposition of steam-forming apparatus.
  • Such apparatus should be within the treatment chamber and be supported on the heating unit structure, which means such apparatus is subjected to the same thermal stresses as arise in the heating unit itself.
  • such apparatus can be accommodated only above and below the thread cable or filaments to be stretched, in which arrangement there exists the danger that entrapped condensate droplets will strike against the thread cable, which may impair the quality of'resultant synthetic fibers.
  • color faults occur at places which contacted condensate droplets.
  • Another object of this invention is to provide a synthetic fiber heating apparatus including means for producing steam wherein there is eliminated any contacting of-steam condensation droplets with fiber material.
  • the improved heating unit of the invention comprises a treatment chamber which is formed between two rigid heating boxes spaced one above the other, supported as hereinafter described to be freely movable to avoid thermal stresses.
  • the lower and upper heating boxes are supported on a set of lower and upper brackets.
  • the upper box has secured to its supports or clamping means consisting of bars which are welded to the upper heating box which bars are supported loosely by the upper brackets.
  • the two heating boxes are connected to a fixed feed line through which is fed heating fluid.
  • the connection piece of the fixed feed line is the reference point from which the boxes move by thermal expansion and contraction.
  • a steam spray pipe For providing steam to the boxes there is arranged, preferably at the horizontal level of the fibrous material on the side away from the aperture, a steam spray pipe. Between the steam pipe and the fibrous material is a bafile plate.
  • the steam pipe and the baffle plate are fastened, preferably to a wall plate which is external of the boxes andwhich shields the treatment chamber from outside influences.
  • the wall plate may be attached to the same brackets which serve to support the two heating boxes, so that the steam pipe is not directly connected to and is independent of the heating boxes.
  • the aperture in the treatment chamber is formed between the longitudinal edges of the wall plate and can be closed by shutters. Deformation of the aperture is virtually precluded because of the freely movable suspension of the heating boxes.
  • the baffle plate which is arranged between the steam pipe and the fibrous material provides for uniform steam conduction above and below the material transversely of its moving direction and at the same time prevents contact of condensate droplets with the fibrous material. Keeping the material free .of condensate droplets is further aided by the fact that the surfaces of the heating boxes bounding the treatment chamber are somewhat inclined with respect to the horizontal, so that condensate forming in 3 the heating boxes flows to the side edge and does not strike the thread cable.
  • FIG. 1 illustrates in cross section a heating unit according to the invention
  • FIG. 2 illustrates a longitudinal section along line 11-11 of FIG. 1;
  • FIG. 3 illustrates in cross section a view along line III-III of FIG. 2.
  • Fibrous material 4 is a thread cable and has the form of a flat band which consists of many individual capillaries, the number of which, depends on the layout of the installation, and may be several ten thousands .or hundred thousands or even several millions. The material moves longitudinally along the center of treatment chamber 3 and, in a typical process, it may be under tension of several tons.
  • Heating boxes 1 and 2 are hollow bodies closed on all sides and reinforced by a plurality of perforated struts 5. Boxes 1 and 2 in operation are filled with heating fluid, for example, diphenyl.
  • heating fluid for example, diphenyl.
  • pipes 6 which may be provided externally with fins 7.
  • heating elements preferably electrical resistance heaters, by which the heating fluid is brought to the working temperature, for example, to 200 to 230 C., depending on the temperature desired in treatment chamber 3.
  • Pipes 6 are secured to heating boxes 1 and 2 by means of end pieces 8 which are welded into the heating boxes and which are internally threaded for use to support boxes 1 and 2.
  • heating boxes 1 and 2 are supported by brackets 10 and 10' and 11 and 11', respectively, which, in turn, are secured rigidly to frame 9 indicated diagrammatically in FIG. 1 by several angle irons.
  • Lower heating box 2 is mounted freely on lower brackets 11 and 11, while upper heating box 1 is freely suspended by means of supports 12 on lower brackets 10 and 10.
  • Supports .or clamping devices 12 may have the form of profile bars, which are fastened at their centers to heating box 1 with their ends supported by brackets 10 and 10' as shown in FIG. 1.
  • heating boxes 1 and 2 there is flanged connecting pieces 13 and 14, respectively, to a common connecting piece 15.
  • Connecting piece 15 serves as a manifold for directing heating fluid to heating boxes 1 and 2 from source tank 16 which may be suspended above upper brackets 10 and 10' on frame 9.
  • Tank 16 is partially filled with heating fluid and serves as a vapor chamber for the heating fluid as well as a source of liquid.
  • draw-off outlet 17 On tank 16 there is connected draw-off outlet 17 for removal of vaporized heating fluid.
  • Tank 16 is also provided with an inlet (not shown) through which heating fluid is fed into the tank.
  • the lower end of manifold 15 is provided with discharge connection 18.
  • heating boxes 1 and 2 are fixedly secured to the heating unit only at a single point, namely at connecting pieces 13 and 14. Boxes 1 and 2 are otherwise free to move on brackets 10 and 10' and 11 and 11, respectively, thereby eliminating thermal stresses which may warp or distort the shape of the boxes and treatment chamber 3. Moreover, the resultant structure provides a simple assemblage since heating boxes 1 and 2 need only be pushed onto their brackets from the side until connecting pieces 13 and 14 are aligned with manifold 15.
  • steam pipe 20 at the horizontal level of the fibrous material.
  • Pipe 20 extends over the length of treatment chamber 3 on the same side of the chamber as pieces 13 and 14.
  • Pipe 20 is supplied with steam through inlet pipe 21.
  • Pipe 20 carries at its terminus a number of spray nozzles 22, through which steam is fed to treatment chamber 3.
  • bafile 23 Between steam pipe 20 and fibrous material 4 there is located bafile 23 which divides the steam flow into two portions, one above and one below the treated material.
  • the steam flow is transverse to the longitudinally extending fibrous material.
  • wall plate 30 which extends around heating boxes 1 and 2 and is attached to frame 9.
  • aperture 27 which forms the operating Opening for the entry of the fibrous material to be treated. Such opening extends over the entire length of treatment chamber 3 and may be closed by one or more shutters 28.
  • plate 30 On the side of wall plate 30 .opposite aperture 27 there is provided a plurality of packed openings (not shown) for lead-through of connecting pieces 13 and 14 as well as for introduction of heating elements (not shown) into pipes 6. Moreover, plate 30 has on its rear longitudinal side located in treatment chamber 3 several holding straps 24 to which are attached steam pipe 20 and baffle plate 23. In this manner heating boxes 1 and 2 are secured independent of pipe 20 and baffle plate 23 and will not interfere with the movement of one another caused by thermal stresses.
  • wall plate 30 The bottom surface of wall plate 30 is formed into a collecting funnel 31 for directing the flow of accumulated condensate which flows through funnel 31 to drain pipe 32.
  • a collecting funnel 31 For the discharge of steam there is provided above upper heating box 1 several discharge outlets through wall plate 30 (not shown) which lead into outlet pipe 33.
  • the surfaces of boxes 1 and 2 facing treatment chamber 3 are preferably inclined to the horizontal in a direction transverse to the fibrous material so that the distance between heating boxes 1 and 2 is slightly greater in the zone of the operating aperture 27 than in the zone of steam pipe 20, as is shown in FIG. 1.
  • This inclination of the inner boundary surfaces of the heating boxes aids in steam conduction in treatment chamber 3 and insures particularly, that any condensate formed on such surfaces flows off to the side edges and does not drip on the fibrous material.
  • fibrous material to be treated is inserted into chamber 3 through aperture 27 with shutter 28 open.
  • supporting straps (not shown) running transversely across the chamber slightly above box 2 prevent direct contact of the material with heating box 2.
  • Such supporting straps are also useful to support material during temporary shut-down of the unit.
  • the insertion process can be carried out without difficulties, even with the unit at operating temperature, since aperture 27 is not at all distorted or deformed by thermal stresses of the equipment. This is especially important in view of the fact that the space between heating boxes 1 and 2 and therefore the size of aperture 27 is relatively small.
  • the heating unit On the entry and exit end faces of the heating unit there may be provided vertically adjustable slides (not shown) by which the size of the slot opening through which the fibrous material extends can be maintained at a minimum, thereby minimizing heat losses from the ends of the heating unit. Moreover, to further reduce heat losses the zone between wall plate 30 and outer casing 40 (indicated schematically) may be provided with insulation. Likewise shutters 28 may be insulated.
  • An apparatus for heating during stretching synthetic fibers moving continuously along a longitudinal axial path comprising:
  • said heaters having extended, generally horizontally oriented opposed and spaced apart heating surfaces which define a heating chamber therebetween through which said fibers travel,
  • said second wall having a longitudinal aperture therein to provide lateral access to said chamher for introduction of said fibers, and includmg:
  • said introducing means being independent of distortions of said first wall produced in response to thermal stresses, whereby deviations in aperture cross section caused by thermal deformation and warping are obviated and fiber insertion at operating temperatures is permitted.
  • An apparatus as in claim 1 which includes:
  • said means being controllable to maintain said fluid at predetermined temperatures.
  • An apparatus as in claim 1 which includes:
  • said pipe having a plurality of spray openings therein, and (b) means defining a bafiie plate disposed adjacent to said pipe for directing steam from said nozzles to upper and lower portions of said chamber whereby said fibers are substantially free from direct impingement of said steam thereupon,
  • said pipe and baffle plate means being supported by said first Wall of said enclosure thereby being free to move in response to thermal stresses independently of said heater means.
  • Apparatus for heating synthetic fibers during stretching comprising an enclosure having a lateral aperture for entry of fibrous material, a plurality of box-like heaters in said enclosure having extended opposed heated surfaces which define a chamber and means operable to open and close the aperture of said enclosure to provide lateral access to said chamber, said box-like heaters having means for providing heating fluid thereto and being supported in said enclosure to provide for free movement in response to thermal stresses, means for providing steam to said chamber, said means including a longitudinally extending pipe having a plurality of spray nozzles and a baffie plate adjacent to said pipe for directing steam from said nozzles to upper and lower portions of said chamber, said steam pipe and bafiie plate being supported by walls of said enclosure and move in response to thermal stresses independently of said box-like heaters.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Fiber Materials (AREA)
US470664A 1964-06-19 1965-06-18 Heating unit for fiber stretching installations Expired - Lifetime US3392267A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEZ10915A DE1291853B (de) 1964-06-19 1964-06-19 Heizvorrichtung zur Waermebehandlung von Fadenkabeln

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US3392267A true US3392267A (en) 1968-07-09

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690159A1 (de) * 1994-11-08 1996-01-03 VAL LESINA S.p.A. Verfahren und Vorrichtung zum Verstecken von synthetischen Garnen unter Verwendung einer Dampfheizung
CN103806157A (zh) * 2012-03-09 2014-05-21 金华市亚轮化纤有限公司 一种胶管线生产工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US629158A (en) * 1898-10-17 1899-07-18 Richard A Gage Apparatus for drying yarn.
US2520202A (en) * 1946-01-21 1950-08-29 Celanese Corp Treatment of filaments, foils, and similar articles
US2590849A (en) * 1947-12-31 1952-04-01 Dungler Julien Method for drying fibrous sheet material
FR1028103A (fr) * 1949-10-29 1953-05-19 Perfogit S P A Procédé et dispositif de fabrication de fils retors en fibres de filatures synthétiques
US2674809A (en) * 1950-08-24 1954-04-13 Raduner & Co Ag Apparatus for thermic treatment by infrared radiation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE465536A (de) * 1942-11-03
CH377037A (de) * 1959-07-03 1964-04-30 Monsanto Chemicals Heizvorrichtung zur Erhitzung eines vorrückenden Wergbandes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US629158A (en) * 1898-10-17 1899-07-18 Richard A Gage Apparatus for drying yarn.
US2520202A (en) * 1946-01-21 1950-08-29 Celanese Corp Treatment of filaments, foils, and similar articles
US2590849A (en) * 1947-12-31 1952-04-01 Dungler Julien Method for drying fibrous sheet material
FR1028103A (fr) * 1949-10-29 1953-05-19 Perfogit S P A Procédé et dispositif de fabrication de fils retors en fibres de filatures synthétiques
US2674809A (en) * 1950-08-24 1954-04-13 Raduner & Co Ag Apparatus for thermic treatment by infrared radiation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690159A1 (de) * 1994-11-08 1996-01-03 VAL LESINA S.p.A. Verfahren und Vorrichtung zum Verstecken von synthetischen Garnen unter Verwendung einer Dampfheizung
CN103806157A (zh) * 2012-03-09 2014-05-21 金华市亚轮化纤有限公司 一种胶管线生产工艺

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Publication number Publication date
DE1291853B (de) 1969-04-03

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