EP0129367B1 - Plaque de filière pour le filage au fondu et méthode pour sa fabrication - Google Patents

Plaque de filière pour le filage au fondu et méthode pour sa fabrication Download PDF

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Publication number
EP0129367B1
EP0129367B1 EP19840303802 EP84303802A EP0129367B1 EP 0129367 B1 EP0129367 B1 EP 0129367B1 EP 19840303802 EP19840303802 EP 19840303802 EP 84303802 A EP84303802 A EP 84303802A EP 0129367 B1 EP0129367 B1 EP 0129367B1
Authority
EP
European Patent Office
Prior art keywords
plate
nozzle
pipe
hole
spinneret plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19840303802
Other languages
German (de)
English (en)
Other versions
EP0129367A2 (fr
EP0129367A3 (en
Inventor
Kiyoshi Takazawa
Takayuki Izumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tonen General Sekiyu KK
Original Assignee
Toa Nenryo Kogyyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toa Nenryo Kogyyo KK filed Critical Toa Nenryo Kogyyo KK
Publication of EP0129367A2 publication Critical patent/EP0129367A2/fr
Publication of EP0129367A3 publication Critical patent/EP0129367A3/en
Application granted granted Critical
Publication of EP0129367B1 publication Critical patent/EP0129367B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/04—Guides for slivers, rovings, or yarns; Smoothing dies
    • 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
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • D01D4/027—Spinnerettes containing inserts

Definitions

  • the present invention relates to a spinneret plate provided with a spinning nozzle which is most suitably employed in melt spinning such as the spinning of pitch carbon fibers, i.e. fibers made of a carbon derived from pitch.
  • each nozzle hole provided in the spinneret plate should be sufficiently small and have a smooth inner surface and a uniform inner diameter, i.e., a uniform aspect ratio.
  • the nozzle holes are generally formed by boring through a nozzle plate using a drill or an electron beam.
  • the method in which boring is effected using a drill encounters various problems as the nozzle hole diameter decreases.
  • the first of the problems is that it is difficult to machine the nozzle holes to a high degree of accuracy. More specifically, the drill itself has a tendency to oscillate when rotating.
  • the drill oscillates owing to drilling resistance, resulting in a hole which had different diameters at the start of drilling and the end of drilling, as shown in Fig. 1.
  • the edge of the drill blunts faster, resulting in a marked reduction in drilling capacity.
  • the electron beam method has been proposed in order to overcome these disadvantages with the boring method using a drill.
  • This method has the disadvantage that the electron beam remains inside the hole during the boring to form a hole whose inner part is expanded, as shown in Fig. 2, so that a nozzle with such a hole would degrade the orientation of the fiber.
  • It has also been proposed to provide tubular inserts in a spinneret plate (DE-B-1102340) to control the uniformity of flow through the inserts by controlling the length of the inserts.
  • a spinneret plate which has a plurality of nozzles, each with a smooth inner surface as well as a uniform hole diameter so that it is able to spin a fine fiber, such as a pitch carbon fiber, over a long period of time.
  • the present invention is a spinneret plate for melt spinning according to the characterizing part of claim 1.
  • a spinneret plate 1b constructed in accordance with the present invention in the embodiment shown in Fig. 3, comprises a nozzle plate 2 of a predetermined thickness, and a hollow tube or pipe 4 of a desired diameter which is mounted in or attached to the nozzle plate 2 by press fitting or the like, into a hole formed in the plate.
  • the interior of the pipe 4 defines the nozzle hole for the spinneret.
  • the nozzle plate 2 is made of a stainless steel plate, and typically has a thickness of 4 mm when melt spinning pitch carbon fibers or the like.
  • the hollow pipe 4 may also be made of a stainless steel and, by way of example, may have the following sizes: inner diameter of 0.55 mm and an outer diameter of 1.5 mm.
  • the nozzle holes formed by the hollow pipes 4 can be disposed in any desired arrangement, they preferably are arranged in one or more concentric rows in the circumferential direction around the center of nozzle plate 2, when melt spinning pitch carbon fibers, for example.
  • the pipe 4 does not extend through the entire thickness of the nozzle plate 2, but is provided through a substantial portion (e.g., about half) of the thickness of the nozzle plate 2 on the outlet side thereof and projects slightly beyond the outlet surface of the nozzle plate 2.
  • An enlarged, tapered inlet 6 in the upstream side of the nozzle plate 2 guides the molten spinning material into the nozzle hole defined by the hollow pipe 4, the inlet comprising an uppermost section of constant diameter followed by a frustoconical section forming a smooth inlet to the pipe 4.
  • the projecting nozzle provides an excellent shedding effect between the molten spinning material and the spinneret plate.
  • the projecting part is secured to the nozzle plate 2 by forming brazed reinforcing shoulders 8.
  • a spinneret plate 1b may be manufactured by the processes which will be described with reference to the sequential drawings of Fig. 4.
  • Fig. 4 illustrates the method of manufacturing the spinneret plate of Fig. 3.
  • the hole is formed in the nozzle plate 2 by drilling a small-diameter part 4' through the plate 2 and then enlarging the inlet side of the hole at 4"' and tapering the section between 4' and 4'" forming transition section 4".
  • the hollow pipe 4 is press-fitted into the small-diameter part 4' of the preliminary hole.
  • the press-fitting operation may be carried out as follows.
  • the preliminary hole 4' is finished so as to have an inner diameter of 1.5 mm, and the nozzle plate 2 is heated to between 150 and 300°C to expand the hole slightly.
  • the hollow pipe 4 is maintained at room temperature, or is cooled at lower temperature and is inserted into the preliminary hole 4', and then the nozzle plate 2 is cooled resulting in a shrink fit.
  • the part of the hollow pipe 4 projecting upward from the small-diameter part 4' of the preliminary hole is then expanded toward the transistion part 4" of the preliminary hole to bring it into close contact with the wall surface of the transition part 4" (see Fig. 4c).
  • Brazing 8 is then applied to the outer peripheral portion of the projecting part of the hollow pipe 4 (see Fig. 4c).
  • This brazing operation may be effected by a conventional method, e.g., by heating in an electric furnace.
  • both the part of the hollow pipe projecting from the outlet side of the nozzle plate 2 and the brazed part of the hollow pipe 4 are ground to a predetermined configuration.
  • the part of the hollow pipe 4 in close contact with the transition part of the prepared hole can be ground by a special tip to cut off the bent part forming the plate 1 b illustrated in Fig. 4d.
  • the present invention thus provides a spinning nozzle from a ready-made hollow pipe which has excellent roundness and straightness. Therefore it is possible to provide an accurate spinneret plate which has a spinning nozzle with an extremely smooth inner surface and a uniform aspect ratio. Further, according to the invention, it is possible to provide a multi-nozzle spinneret plate provided with a plurality of such accurate nozzle holes.
  • the employment of the spinneret plate in accordance with the present invention makes it possible to spin pitch carbon fibers or the like stably over a long period of time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Claims (2)

1. Plaque-filière de filage à chaud pour la production de fibres par filage au fondu, comprenant une plaque à ajutage (2) dans laquelle un trou (4') au moins est formé perpendiculairement au plan de la plaque à ajutage, un tube (4) placé dans ce trou et ayant une surface extérieure uniforme et une surface intérieure lisse, l'une des extrémités du tube (4) s'étendant au-delà de l'une des faces de la plaque et l'autre extrémité étant située au-dessous d'une admission associée (4") de section progresivement décroissante, formée dans la plaque, caractérisée en ce que le trou comprend un premier segment axial (4"') de diamètre uniforme, un second segment axial (4') de diamètre uniforme, dans lequel le tube (4) est placé, et un segment tronconique (4") reliant le premier et le second segments et constituant ladite admission de section décroissante, le tube (4) étant fixé dans le second segment par ajustage serré par retrait et des épaulements de renfort (8) étant formés autour de l'extrémité saillante du tube (4) pour fixer fermement le tube (4) à la plaque à ajutage (2).
2. Plaque-filière selon la revendication 1, caractérisée en ce que la plaque à ajutage et l'ajutage sont faits d'acier inoxydable.
EP19840303802 1983-06-16 1984-06-05 Plaque de filière pour le filage au fondu et méthode pour sa fabrication Expired EP0129367B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10672483A JPS602704A (ja) 1983-06-16 1983-06-16 溶融紡糸用紡糸口金及びその製造法
JP106724/83 1983-06-16

Publications (3)

Publication Number Publication Date
EP0129367A2 EP0129367A2 (fr) 1984-12-27
EP0129367A3 EP0129367A3 (en) 1985-04-24
EP0129367B1 true EP0129367B1 (fr) 1988-10-26

Family

ID=14440887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840303802 Expired EP0129367B1 (fr) 1983-06-16 1984-06-05 Plaque de filière pour le filage au fondu et méthode pour sa fabrication

Country Status (3)

Country Link
EP (1) EP0129367B1 (fr)
JP (1) JPS602704A (fr)
DE (1) DE3474843D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220805A (ja) * 1985-03-28 1986-10-01 日本碍子株式会社 セラミツクハニカム構造体の押出ダイス
JPS62238808A (ja) * 1986-04-08 1987-10-19 Risuron:Kk 押出し成型機における合成樹脂細糸の製造法及び装置
JPS62257412A (ja) * 1986-05-02 1987-11-10 Risuron:Kk 押出し成型機における合成樹脂細糸の製造装置
FR2645880A1 (fr) * 1989-04-14 1990-10-19 Devtex
CA2041416A1 (fr) * 1990-09-19 1992-03-20 Nimet C. Hatcher Filiere
AU3166400A (en) * 1999-03-14 2000-10-04 Klaus Rennebeck Spinneret
WO2001020064A1 (fr) * 1999-08-19 2001-03-22 Jeong Sik Kim Buse de filage, raccord de filage recevant cette buse et procede de fabrication

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL74329C (fr) * 1949-11-23
GB749750A (en) * 1952-10-10 1956-05-30 Johnson Matthey Co Ltd Improvements in and relating to spinnerets
DE1102340B (de) * 1956-10-03 1961-03-16 Bayer Ag Verfahren zum Abgleichen der Durchflussmengen von Kapillaren
US3308504A (en) * 1965-07-22 1967-03-14 Us Rubber Co Spinnerets
GB1126609A (en) * 1966-07-20 1968-09-11 Du Pont Spinneret
JPS554300U (fr) * 1979-07-17 1980-01-11
JPS57101003A (en) * 1980-12-09 1982-06-23 Tanaka Kikinzoku Kogyo Kk Spinneret

Also Published As

Publication number Publication date
DE3474843D1 (en) 1988-12-01
JPS602704A (ja) 1985-01-09
EP0129367A2 (fr) 1984-12-27
EP0129367A3 (en) 1985-04-24

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