EP1748874A1 - Procede pour produire des granules de plastique contenant des fibres - Google Patents

Procede pour produire des granules de plastique contenant des fibres

Info

Publication number
EP1748874A1
EP1748874A1 EP05740572A EP05740572A EP1748874A1 EP 1748874 A1 EP1748874 A1 EP 1748874A1 EP 05740572 A EP05740572 A EP 05740572A EP 05740572 A EP05740572 A EP 05740572A EP 1748874 A1 EP1748874 A1 EP 1748874A1
Authority
EP
European Patent Office
Prior art keywords
fiber
particularly preferably
plastic
fiber strand
granules
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.)
Withdrawn
Application number
EP05740572A
Other languages
German (de)
English (en)
Inventor
Jan O. P. Pavlinec
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1748874A1 publication Critical patent/EP1748874A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • B29B9/14—Making granules characterised by structure or composition fibre-reinforced
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2998—Coated including synthetic resin or polymer

Definitions

  • the present invention relates to a method for producing fiber-containing plastic granules, fiber-containing plastic granules obtainable with this method and their use.
  • Fiber-containing plastic granules are used as a raw material, among other things. used in the manufacture of fiber-reinforced molded plastic parts, in order to determine the amount of fiber, depending on the nature of the fibers, e.g. B. to increase the mechanical strength or the electrical conductivity of the molded parts.
  • Such fiber-containing plastic granules usually consist of fiber bundles with a length of 1 to 20 mm and a diameter of 1 to 5 mm and are encased in or embedded in a plastic layer.
  • These granules are usually produced by melt, pultrusion or extraction processes, in which the fiber strands to be coated are passed through a melt containing thermoplastics and then through a heated nozzle in an extruder before the coated strands are cooled and cut to length in a granulating device.
  • melt, pultrusion or extraction processes in which the fiber strands to be coated are passed through a melt containing thermoplastics and then through a heated nozzle in an extruder before the coated strands are cooled and cut to length in a granulating device.
  • the disadvantage of these processes is the high process and device costs caused by the maintenance of a plastic melt.
  • these processes are inflexible, since a new heated nozzle is required for each new fiber strand diameter when the starting material is changed.
  • the object of the present invention is therefore to provide an alternative, cost-effective method for producing fiber-containing plastic granules, which in particular is also variable with regard to the diameter of the fiber strands used.
  • this object is achieved by a method according to claim 1.
  • fiber strands can be firmly and completely enclosed or encased with a plastic film even without extruders or extruder-like devices, such as heated nozzles or the like. Therefore, fiber strands with different diameters can be used in the method according to the invention without the need to retrofit the device necessary for carrying out the method. Since the fiber strands do not have to be passed through a melt or have to be impregnated with plastic in a fluidized bed, but rather are encased with an already finished plastic film, the process according to the invention, in comparison with the process known from the prior art, allows granules with higher fiber shares, namely produce those with more than 99 wt .-%.
  • the granules are compatible with all thermoplastic materials used in conventional injection molding processes.
  • the method according to the invention can be carried out inexpensively.
  • all plastic films known to the person skilled in the art can be used in the process according to the invention for covering the fiber strand, provided that these are at least partially heat-shrinkable.
  • plastic films which have a heat shrinkage of 20 to 70%, particularly preferably 40 to 70% and very particularly preferably 50 to 70% are, for example, polyethylene, polyvinyl chloride, polyethylene terephthalate, polypropylene and copolymers.
  • the overlap areas can be welded in any manner known to the person skilled in the art for this purpose, in particular by means of continuously operating film sealing devices.
  • all staple fiber strands and endless fiber strands can be used as fiber material. It has proven to be advantageous to pretreat them with finishing agent before covering them with the plastic film.
  • the duration of the heat treatment and the level of the temperature set in this process step primarily depends on the heat shrinkage, the material and the thickness of the plastic film used and is preferably between 50 and 180 ° C., particularly preferably between 50 and 150 ° C and very particularly preferably between 50 and 100 ° C. Due to the heat treatment, the plastic covering contracts until it lies firmly on the fiber strand.
  • the method is carried out continuously, for example by first leading the fiber strand, if appropriate pretreated with finishing agent, preferably from a drum, bobbin or storage can, through a packaging device in which it is completely enclosed with the plastic film while the overlap areas are welded , the coated strand is then processed through a heating zone and finally fed to a cutting granulator.
  • the heating zone can also be integrated in the packaging device.
  • the coated fiber strand is guided for so long that it preferably cools down to room temperature.
  • a cooling device can also be provided for this purpose.
  • Another object of the present method is a fiber-containing plastic granulate obtainable with the method according to the invention.
  • the fiber content of the granules according to the invention is preferably 60 to 99.5% by weight, particularly preferably 90 to 99.5% by weight and very particularly preferably 95 to 99.5% by weight.
  • the diameter and the length of the granules are based on the following application, the diameter of the granules preferably between 1 and 5 mm, particularly preferably between 1.5 and 5 mm and very particularly preferably between 2.5 and 5 mm and the length of the Granules is preferably between 2 and 15 mm, particularly preferably between 3 and 10 mm and very particularly preferably between 4 and 6 mm.
  • the plastic granules according to the invention are suitable, inter alia, for the production of all types of fiber-reinforced plastic molded parts.
  • FIG. 1 is a process diagram of a method and an apparatus for producing fiber-containing plastic granules according to an embodiment of the present invention
  • FIG. 2 shows the schematic cross section of a fiber-containing plastic granulate according to a first exemplary embodiment of the present invention
  • FIG. 3 shows the schematic cross section of a fiber-containing plastic granulate according to a second exemplary embodiment of the present invention.
  • FIG. 4 shows the schematic cross section of a fiber-containing plastic granulate according to a third exemplary embodiment of the present invention.
  • a fiber strand 1 is continuously and successively through a corresponding drive (not shown) a packaging device 2, a heating zone 3 and a cutting granulator 4 out.
  • the fiber strand 1 is supplied with a heat-shrinkable plastic film 6, which is fed to the fiber strand 1 via a film reel 5, which is preferably part of the packaging device 2 and is shown separately in FIG. 1 only for the purpose of illustration , completely forming an overlap area 7, 8, 9 of the film ends and then the film ends are welded in the overlap area 7, 8, 9, for example by applying heat and pressure.
  • the fiber strand 1 can be wrapped with the film 6 in such a way that the film ends, in relation to the longitudinal axis of the fiber strand 1, overlap axially 7, axially with the formation of a lip 8 or a spiral 9.
  • the film 6 contracts until it lies closely on the fiber strand 1, the length of the heating zone 3 and the temperature set therein being adapted to the shrinking properties of the film 6 used is.
  • the covered fiber strand 1 is guided until it has preferably cooled to room temperature before it is cut to length by processing using a cutting granulator 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

La présente invention concerne un procédé pour produire de façon économique des granules de plastique contenant des fibres, le procédé comprenant les étapes suivantes: un faisceau de fibres (1) est entouré en intégralité d'un film de plastique (6) au moins partiellement thermorétractable, en constituant une zone de recouvrement (7) des extrémités du film; la zone de recouvrement est soudée; puis le faisceau de fibres (1) ainsi entouré, subit un traitement thermique, est refroidi et est mis sous forme de granules. L'invention a également pour objet des granules de plastique contenant des fibres, qui peuvent être obtenues grâce à ce procédé, ainsi que leur utilisation.
EP05740572A 2004-05-27 2005-04-28 Procede pour produire des granules de plastique contenant des fibres Withdrawn EP1748874A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004026493A DE102004026493A1 (de) 2004-05-27 2004-05-27 Verfahren zur Herstellung von faserhaltigen Kunststoffgranulaten
PCT/EP2005/004566 WO2005118243A1 (fr) 2004-05-27 2005-04-28 Procede pour produire des granules de plastique contenant des fibres

Publications (1)

Publication Number Publication Date
EP1748874A1 true EP1748874A1 (fr) 2007-02-07

Family

ID=34967257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05740572A Withdrawn EP1748874A1 (fr) 2004-05-27 2005-04-28 Procede pour produire des granules de plastique contenant des fibres

Country Status (4)

Country Link
US (1) US20070292689A1 (fr)
EP (1) EP1748874A1 (fr)
DE (1) DE102004026493A1 (fr)
WO (1) WO2005118243A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2481544B1 (fr) 2011-01-26 2017-12-06 Thüringisches Institut Für Textil- Und Kunststoff- Forschung E.V. Procédé de fabrication de corps enveloppés et contenant des fibres
JP7081335B2 (ja) * 2018-03-15 2022-06-07 株式会社リコー 立体造形物の製造装置及び立体造形物の製造方法
CN110862608B (zh) * 2019-11-25 2022-02-25 南通复源新材料科技有限公司 一种再生碳纤维增强pp材料及其制备方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597292A (en) * 1966-07-04 1971-08-03 Iwao Niwa Process for effecting a bond between synthetic resin fiber fabrics and an apparatus therefor
GB1352391A (en) * 1971-06-10 1974-05-08 Ici Ltd Production of fibre reinforced thermoplastic materials
GB1549672A (en) * 1976-11-06 1979-08-08 Ciba Geigy Ag Reinforced plastics materials
US4944965A (en) * 1985-06-13 1990-07-31 American Cyanamid Elongated molding granules and injection-molding process employing them
DE3810598A1 (de) * 1988-03-29 1989-10-12 Bayer Ag Metallfasern enthaltende verbundstoffe sowie deren verwendung zur herstellung von formteilen zur abschirmung von elektromagnetischer strahlung
JPH02247008A (ja) * 1989-03-17 1990-10-02 Furukawa Electric Co Ltd:The 導電性樹脂用金属繊維の製造方法及び金属繊維組成物
IT1254197B (it) * 1992-02-06 1995-09-14 Donegani Guido Ist Procedimento per la preparazione di corpi formati in polimeri termoplastici rinforzati con fibra lunga
JP3100567B2 (ja) * 1997-09-08 2000-10-16 旭ファイバーグラス株式会社 長繊維強化熱可塑性樹脂成形材料
AT411661B (de) * 2002-11-28 2004-04-26 Bruno Ing Svoboda Langfasergranulat

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005118243A1 *

Also Published As

Publication number Publication date
WO2005118243A1 (fr) 2005-12-15
DE102004026493A1 (de) 2006-04-13
US20070292689A1 (en) 2007-12-20

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