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WO2006071105A1 - Dispositif pour decouper un faisceau de fibres en fibres et utilisation dudit dispositif - Google Patents

Dispositif pour decouper un faisceau de fibres en fibres et utilisation dudit dispositif Download PDF

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Publication number
WO2006071105A1
WO2006071105A1 PCT/NL2004/000915 NL2004000915W WO2006071105A1 WO 2006071105 A1 WO2006071105 A1 WO 2006071105A1 NL 2004000915 W NL2004000915 W NL 2004000915W WO 2006071105 A1 WO2006071105 A1 WO 2006071105A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
fibres
blade
hole
bundle
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.)
Ceased
Application number
PCT/NL2004/000915
Other languages
English (en)
Inventor
Cornelis Smolders
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.)
SMOLDERS TOOL WORKS BV
Original Assignee
SMOLDERS TOOL WORKS BV
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 SMOLDERS TOOL WORKS BV filed Critical SMOLDERS TOOL WORKS BV
Priority to PCT/NL2004/000915 priority Critical patent/WO2006071105A1/fr
Priority to NL1030434A priority patent/NL1030434C2/nl
Publication of WO2006071105A1 publication Critical patent/WO2006071105A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/02—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form
    • D01G1/04—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form by cutting

Definitions

  • the present invention relates to a device for cutting a bundle of fibres, in particular a bundle of bard fibres, such as Kevlar fibres or Twaron fibres, into fibres.
  • a bundle of fibres such as Kevlar fibres or Twaron fibres
  • Such bundles of so-called hard fibres are very difficult to process to give separate, small fibres. The reason for this lies in the very great hardness of the fibre material.
  • Very small fibres of such a material where "very small” is understood to mean in particular fibres with a length of up to 20 mm, in particular less than 10 mm, are used in practice as a substitute for asbestos, in brake blocks, in clutch plates etc.
  • the aim of the present invention is to provide a device of the type indicated in the preamble by means of which a bundle of so-called hard fibres can be cut in an efficient, reliable manner to give fibres, hereinafter also referred to as smaller fibres.
  • said aim is achieved by providing a device for cutting a bundle of fibres, in particular a bundle of hard fibres, such as Kevlar fibres or Twaron fibres, into fibres, wherein the device comprises:
  • a cutting plate with a cutting side and an opposing feed side as well as at least one hole for feeding the bundle from the feed side through the hole to the cutting side;
  • a blade head that has at least one blade, wherein the blade head is provided on the cutting side of the plate and is equipped to move the at least one blade along the cutting side of the cutting plate over the at least one hole such that the blade, on passing over the hole, in interaction with the part of the cutting plate surrounding the hole, cuts off a portion of the bundle protruding from said hole for making the fibres; • feed means provided on the feed side of the cutting plate for feeding the bundle through the hole from the feed side,
  • Such a device makes it possible to feed the bundle containing fibres to be cut to the cutting location in a reliable manner, specifically by feeding this bundle through a hole in the cutting plate and then cutting it off when it emerges from the hole on the cutting side.
  • the hole holds the bundle of fibres in place. Furthermore, a very high production speed is possible with these devices and also very small fibres can be produced while maintaining said high production speed.
  • the production speed as such is determined by the frequency with which the blade passes over the cutting hole. This frequency can be increased by using multiple blades. With this arrangement the fibre length of the cut-off fibres is determined by the feed speed of the bundle in combination with the cutting frequency.
  • this device furthermore comprises pressure means engaging on the cutting plates or the cutting head, or at least the blade, and equipped to press the blade and the cutting side of the cutting plate against one another when the blade moves along the cutting side, or at least past the hole.
  • pressure means engaging on the cutting plates or the cutting head, or at least the blade, and equipped to press the blade and the cutting side of the cutting plate against one another when the blade moves along the cutting side, or at least past the hole.
  • the Applicant has found mat a pressure higher than 30 bar gives no noticeable improvement in the cutting result. It is furthermore advantageous according to the invention if the cutting edge of the blade facing in the cutting direction during cutting is blunt.
  • the Applicant has found that the tool life of the blade can be appreciably increased by deliberately making the blade blunt or at least the effective cutting edge thereof. This is extremely important in the case of such so-called hard fibres because the wear on the cutting materials is very high here.
  • a deliberately blunt blade leads, on the one hand, to a good cutting result and, on the other hand, to a significantly longer tool life.
  • the cutting surface is a flat surface that with the part of the cutting side of the cutting plate facing away from the cutting direction encloses an obtuse angle ⁇ of greater than or equal to 90°.
  • the blunting is an obtuse angle in the mathematical sense.
  • the obtuse angle ⁇ is approximately 90° to 120°, such as approximately 95° to 105°.
  • the at least one blade has a flat section running parallel to the cutting plate on the side of the blade facing away rrom the cutting direction, which flat section, at least during cutting, is in contact with the cutting side of the cutting plate.
  • this flat portion viewed in the direction of the relative movement of the blade with respect to the hole, has a length of at least 2 mm, preferably 2 to 4 mm.
  • feeding of the bundle of fibres can be achieved in a very efficient manner if the feed means comprise gas injection means and a tube with one end that can be joined onto the at least one hole, the opposing, other end of which tube widens, preferably continuously, such as conically, for introducing the bundle of fibres into the tube, the gas injection means being equipped for injecting a gas into the tube in the direction of the cutting plate, such that injected gas carries the bundle along towards the hole.
  • the gas injection means comprise an injection nozzle that according to the invention advantageously opens into the widened end of the tube.
  • the covering is implemented by means of one or more tube sections of said diamond-like material, or at least tube sections covered on the inside with said diamond-like material, placed in the hole.
  • the cutting head can be rotated about an axis of rotation by means of a drive.
  • the cutting plate has several such holes, wherein said holes are provided at a specific radius with respect to the axis of rotation, and if the cutting head has one or more blades, preferably at least as many blades as there are holes. Ih this way it is possible to cut at several holes with one blade. By providing at least one blade per hole it is furthermore possible to cut at high frequency.
  • the cutting plate is provided with cooling channels which are connected to a cooling system for feeding a cooling medium through the cooling channels.
  • a cooling system for feeding a cooling medium through the cooling channels.
  • the invention relates to the use of a device according to the invention for cutting a bundle of fibres, in particular a bundle of hard fibres, such as Kevlar fibres or Twaron fibres, into fibres.
  • a device according to the invention for cutting a bundle of fibres, in particular a bundle of hard fibres, such as Kevlar fibres or Twaron fibres, into fibres.
  • the cutting side of the cutting plate and, on the other hand, the cutting head, or at least the at least one blade are pressed against one another with a pressure of at least 3 bar during cutting.
  • this pressure will be at most 30 bar. Ih particular the pressure will be approximately 5 to 10 bar.
  • the bundle of fibres is fed to the hole in the cutting plate by blowing this bundle by means of a gas through a channel that emerges at said hole.
  • ambient air in particular ambient air at room temperature (15 to 20 0 C) is used for said gas.
  • the invention can be applied in particular to fibre bundles consisting of polyarylamide fibres, in particular comprising poly-p-phenyleneterephthalamides, which include Twaron and Kevlar.
  • the invention can also be applied for cutting glass fibre, such as glass fibre sheathed in polyurethane.
  • the invention can also be applied for cutting strands of a material that is less hard or not hard into smaller pieces.
  • Figure 1 shows a highly diagrammatic and perspective complete view of an assembly of which the device according to the invention forms part
  • Figure 2 shows a diagrammatic side view in section of the device according to the invention
  • Figure 3 shows a view of a cutting plate of the device according to the invention
  • Figure 4 shows a highly diagrammatic detail, partially in section, partially in front view, of the cutting plate and blade at the cutting location, which detail corresponds to the section indicated as IV-IV in Figure 3.
  • Figure 1 shows an assembly of which the device 1 according to the invention forms part.
  • the assembly shown in Figure 1 comprises a stock system 30 with a number of spools 31 on which bundles 2 of fibres to be cut into smaller fibres have been wound as well as a number of guide members 32.
  • Figure 1 furthermore shows a frame unit 40 of which the cutting device 1 according to the invention fo ⁇ ns part.
  • the frame unit 40 is provided with a drive 22 for driving the cutting head 7 ( Figure 2) for rotation about the axis of rotation 23.
  • pressure means 12 in the form of a hydraulic pressure system by means of which the cutting head 7, or at least the blades 8 thereof, can be pressed against the cutting side 4 of the cutting plate 3 under pressure can also be seen in Figure 1.
  • the cutting device 1 with cutting plate 3 and cutting head 7 will be described in more detail further below.
  • One or more, in this case four bundles of fibres are fed to the cutting device 1.
  • Each bundle is fed through a hole in the cutting plate and on emerging from said hole is in each case cut off in portions. On cutting off, the cut-off portion of the bundle falls apart into separate "smaller" fibres. These separate fibres are collected on a conveyor 42 and fed to a collection bin 43.
  • a third frame unit 50 is also shown on the left of Figure 1.
  • This frame unit is provided with a polishing table by means of which the cutting plate, or at least the cutting side thereof, can be machined, in particular polished and smoothed.
  • the cutting plate or at least the cutting side thereof, can be machined, in particular polished and smoothed.
  • Figure 2 shows the cutting device 1 according to the invention in side view, diagrammatically, partially in section and partially in a front view.
  • the cutting device 1 essentially comprises a cutting plate 3 with a cutting side 4. This can also be seen in the front view in Figure 3, where the cutting plate 3 is viewed from the cutting side. In Figure 3 in combination with Figure 2 it can clearly be seen that the cutting side 4 is a raised ring. Furthermore, holes 6 have been made in the cutting plate. These holes can have a diameter of, for example, approximately 20 mm. Bundles 2 of fibres are fed from the feed side 5 of the cutting plate 3 to each hole 6, in this case four holes. This feed can be effected in a wide variety of ways. For example, the bundle of fibres can be fed between two conveyor belts placed some distance apart and said conveyor belts can be made to run round.
  • the feed means as tubes 10 that join onto the holes 6 at one end and widen conically at the other end.
  • Bundle 2 of fibres is fed into said tubes at the widened end 17.
  • An annular injection nozzle 11, which is located around the bundle 2, is also provided at the widened end 17.
  • the injection nozzle 11 is connected to a gas feed line 12.
  • the injection nozzle 11 has its injection openings oriented towards the cutting plate 3.
  • the bundle 2 On emerging from the cutting plate 3 on the cutting side 4, the bundle 2 will in each case be cut off as soon as a blade 8 passes by a hole 6. Since such so-called hard fibres are very difficult to cut, there will be substantial evolution of heat during this operation. For this reason the cutting plate is provided with cooling channels 24 and 25.
  • the gas blown in via the injection nozzle 11 primarily for transport purposes is also highly advantageous for cooling the bundle, the cutting plate 3 and the blade 8 at the cutting location. For this purpose it can even be advantageous to cool the gas additionally.
  • good cooling is already achieved if ordinary ambient air at, for example, room temperature or even at 40 0 C is used.
  • the blade 8 is pressed under a sufficiently high pressure, of at least 3 bar, against the cutting side of the cutting plate. - To prevent the blade 8 earing into the cutting side 4 of the cutting plate 3 during this operation, said blade 8 is advantageously provided with a flat surface 16 on the bottom.
  • the hole 6 is covered with a diamond-like material, for example a synthetic diamond-like material or a natural diamond-like material.
  • This covering can preferably be produced by means of tube sections 20, 21. These tube sections 20, 21 enable simple replacement should a tube section be worn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention concerne un dispositif destiné à découper un faisceau de fibres, en particulier un faisceau de fibres dures, telles que des fibres de kevlar, en fibres. Le dispositif comprend un plateau de découpe avec un côté de découpe et un côté opposé d’introduction, de même qu’au moins un trou pour introduire le faisceau depuis le côté d’introduction à travers le trou vers le côté de découpe. Le dispositif comprend en outre une tête de lame qui possède au moins une lame et des moyens d’introduction destinés à introduire le faisceau à travers le trou depuis le côté d’introduction. La tête de lame est prévue sur le côté de découpe du plateau et est équipée pour déplacer la au moins une lame le long du côté de découpe du plateau sur le au moins un trou de telle sorte que la lame, lorsqu’elle passe sur le trou, en interaction avec la partie du plateau de découpe qui entoure le trou, découpe une partie du faisceau dépassant dudit trou pour créer les fibres. L’invention concerne en outre l’utilisation dudit dispositif.
PCT/NL2004/000915 2004-12-27 2004-12-27 Dispositif pour decouper un faisceau de fibres en fibres et utilisation dudit dispositif Ceased WO2006071105A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/NL2004/000915 WO2006071105A1 (fr) 2004-12-27 2004-12-27 Dispositif pour decouper un faisceau de fibres en fibres et utilisation dudit dispositif
NL1030434A NL1030434C2 (nl) 2004-12-27 2005-11-15 Inrichting voor het tot vezels snijden van een vezelbundel alsmede het gebruik van een dergelijke inrichting.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2004/000915 WO2006071105A1 (fr) 2004-12-27 2004-12-27 Dispositif pour decouper un faisceau de fibres en fibres et utilisation dudit dispositif

Publications (1)

Publication Number Publication Date
WO2006071105A1 true WO2006071105A1 (fr) 2006-07-06

Family

ID=34960061

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2004/000915 Ceased WO2006071105A1 (fr) 2004-12-27 2004-12-27 Dispositif pour decouper un faisceau de fibres en fibres et utilisation dudit dispositif

Country Status (1)

Country Link
WO (1) WO2006071105A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217766A (en) * 1939-11-24 1940-10-15 Du Pont Staple cutting apparatus
US4251198A (en) * 1979-04-27 1981-02-17 Gala Industries, Inc. Cutter hub with replaceable knife blades for underwater pelletizer
US4655111A (en) * 1985-08-12 1987-04-07 Cemen Tech, Inc. Fiber cutting device
US4698009A (en) * 1985-05-31 1987-10-06 Societa' Cavi Pirelli S.P.A. Granulator for cross-linkable plastic
US5836225A (en) * 1991-12-03 1998-11-17 Nordson Corporation Method and apparatus for processing chopped fibers from continuous tows

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217766A (en) * 1939-11-24 1940-10-15 Du Pont Staple cutting apparatus
US4251198A (en) * 1979-04-27 1981-02-17 Gala Industries, Inc. Cutter hub with replaceable knife blades for underwater pelletizer
US4698009A (en) * 1985-05-31 1987-10-06 Societa' Cavi Pirelli S.P.A. Granulator for cross-linkable plastic
US4655111A (en) * 1985-08-12 1987-04-07 Cemen Tech, Inc. Fiber cutting device
US5836225A (en) * 1991-12-03 1998-11-17 Nordson Corporation Method and apparatus for processing chopped fibers from continuous tows

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