Classifications

• • 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
  • D02J13/003—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass by contact with at least one stationary surface, e.g. a plate
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
  • D01D10/02—Heat treatment
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
  • D01D10/04—Supporting filaments or the like during their treatment
  • D01D10/0436—Supporting filaments or the like during their treatment while in continuous movement
  • D01D10/0481—Supporting filaments or the like during their treatment while in continuous movement the filaments passing through a tube

Definitions

• ABSTRACT The element is a tube with a zone of its inner wall extended i I t Pr t D In [30] Fore gn Applca [on y a radially close to its axis over a helicoidal track extending Apr. 30, 1969 France ..69l3804 th h the tube, The thread can thus be passed axially through the tube and heated by conduction through the zone. [52] US. Cl. ..165/177, 28/62, 57/34 HS whilst b i Simultaneously h d b di i f th t b [51] Int. CI.
• the invention relates to heating elements for the thermal treatment of threads, especially threads intended for the textile industry, in particular for false-twisting machines which process synthetic and artificial filaments.
• the transmission of heat energy between a heating element and the thread to be treated is effected, either by conduction, the thread to be heated being in contact with a hot surface, or by radiation, the thread to be heated being surrounded by a hot wall, or by convection, the thread to be heated being subjected to the action of a hot fluid, and no heating element existed capable of applying simultaneously two methods of transmitting heat energy as is concerned above, or even the three above-said methods of transmission.
• the heating element according to the invention is characterized by the fact that it comprises a tube of which the wall has at least one inner zone extending, radially up to the neighborhood of the axis of the tube, the distance between this inner zone and the axis of the tube being preferably equal to the radius of the thread to be treated, and, coaxially over the whole or part of the length of the tube by following a helicoidal track, the thread to be treated which passes coaxially through this heating element being thus in contact with the above-said inner zone which surrounds this thread, so that the transmission of heat energy between the heating element and the thread to be treated is effected at the same time by conduction (since the thread is in contact with the inner zone over the whole length of the heating element), by radiation (since the thread is held coaxially in the tube and receives heat energy radiated perpendicularly towards the inside by the wall of the tube), and by convection (since the thread is bathed by a helicoidal flow of hot fluid circulating on the inside of the tube and guided by
• the invention consists, apart from this main feature, in certain other features which are preferably usedat the same time and which will be more explicitly considered below.
• FIG. 1 shows a partial diagrammatic view in perspective, with portions removed, of a first embodiment of a heating element according to the invention
• FIGS. 2,3 and 4 are respectively an end view and two crosssections of this heating element, along the planes II, III and IV of FIG. 1;
• FIGS. 5, 6, 7 and 8 are cross-sections showing respectively other embodiments of a heating element according to the invention.
• the heating element according to the invention includes a tube 2 of which the wall has an inner zone 3 which extends, radially up to the neighborhood of the axis XX of the tube 2, the distance between this inner zone 3 and the axis XX of the tube 2, being equal to the radius of the thread to be treated 4, and axially over the whole length of the tube 2 by following a helicoidal track.
• the thread to be treated 4 passes coaxially through this heating element 1 and it is thus in contact with the inner zone 3 which surrounds thread 4.
• the tube could include several inner zones each extending radially up to the neighborhood of the axis of the tube and axially over the whole length of the tube by following a helicoidal track, these inner zones being regularly distributed over the wall of the tube (in the manner of helicoidal threads of a multiple thread screw).
• tube 2 includes therefore a single inner zone 3.
• the ratio between the pitch A of the helicoidal track of this inner zone 3 and the inner diameter D of tube 2 is advantageously comprised between 10 and 50.
• the pitch A of the helicoidal track of the inner zone 3 can be constant over the whole length of the tube 2 or variable over this length.
• the inner zone 3 has a solid section, the tube 2 preserving a circular outer cross-section.
• the inner zone 3 has a hollow cr0ss-section and it is obtained by deformation of the tube 2.
• the tube 2 no longer has a circular outer cross-section, but this outer cross-section remainsinscribed in this tube 2 before deformatron.
• the inner zone 3 has a flat cross-section as it is constituted by a diametrical zone.
• the tube 2 no longer has a circular outer cross-section, but this outer cross-section remains inscribed in that of a tube which would have the same outer diameter as the tube 2 constituting the heating element 1.
• the heating element applies the three methods of transmission of heat energy and, through this fact, it ensures efficient and rapid heating of the thread to be treated.
• the heating element has externally the shape of a rectilinear tube, which enables easy positioning in particular heating blocks and enables also simple mounting in already existing heating assemblies in the place of the conventional heating elements, in order to improving the yield of these heating assemblies.
• An arrangement for the thermal treatment of threads by a heating fluid comprising a tube through which the thread to be treated is passed along an axial path, said tube having a circumferentially closed wall having at least one helicoidal inner zone extending close to said axial path of said thread over at least part of the length of said tube so as to be in contact with a thread moving along said axial path, whereby when a heating fluid is passed through said tube, heat is transferred to the thread not only by convection from the fluid but also by heat conduction from said inner zone in contact with the thread and by heat radiation from the inner wall surface.
• said helicoidal inner zone is constituted by a radially inwardly curving ridge of said circumferentially closed tube wall, said ridge having a helicoidal apex line extending about the axis of said tube closely adjacent thereto so as to contact a thread passed coaxi ally through said tube.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Treatment Of Fiber Materials (AREA)
• Resistance Heating (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9033311

Family Applications (1)

Country Status (5)

Families Citing this family (7)

Citations (2)

• 1969
  • 1969-04-30 FR FR6913804A patent/FR2041583A5/fr not_active Expired
  • 1969-10-28 DE DE19691954099 patent/DE1954099A1/de active Pending
• 1970
  • 1970-04-02 US US32586A patent/US3666008A/en not_active Expired - Lifetime
  • 1970-04-25 DE DE7015528U patent/DE7015528U/de not_active Expired
  • 1970-04-28 JP JP45036757A patent/JPS4912867B1/ja active Pending
  • 1970-04-29 GB GB20498/70A patent/GB1281634A/en not_active Expired

Patent Citations (2)

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