EP1150847B1 - Verfahren zur herstellung eines stiftes durch tri-extrusion und stift mit einer schutzschicht - Google Patents

Verfahren zur herstellung eines stiftes durch tri-extrusion und stift mit einer schutzschicht Download PDF

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Publication number
EP1150847B1
EP1150847B1 EP00985357A EP00985357A EP1150847B1 EP 1150847 B1 EP1150847 B1 EP 1150847B1 EP 00985357 A EP00985357 A EP 00985357A EP 00985357 A EP00985357 A EP 00985357A EP 1150847 B1 EP1150847 B1 EP 1150847B1
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EP
European Patent Office
Prior art keywords
protective layer
pencil
thermoplastic
thermoplastic material
lead
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 - Lifetime
Application number
EP00985357A
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English (en)
French (fr)
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EP1150847A1 (de
Inventor
Ludovic Chochoy
Hélène BAILLIEU
Jacques Bachelet
Lucien Foscarin
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Conte SA
Original Assignee
Conte SA
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Filing date
Publication date
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Application filed by Conte SA filed Critical Conte SA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
    • B43K19/16—Making non-propelling pencils
    • 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
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31924—Including polyene monomers
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31928—Ester, halide or nitrile of addition polymer

Definitions

  • the present invention relates to a process for the continuous manufacture of a writing or coloring pencil, by simultaneous extrusion of thermoplastic materials constituting successively on the one hand the mine and on the other hand the material that surrounds the mine, called wood material in the remainder of this text by analogy with the composition of traditional pencils, in which this material is wood. It relates more particularly to a process by tri-extrusion of thermoplastics according to which an intermediate protective layer is coextruded between the mine and the wood material. It also relates to a writing or coloring pencil, obtainable by the method of the invention.
  • thermoplastic materials constituting the lead material, an intermediate protective layer and the wood material are already known from document EP.0.505.262.
  • the intermediate protective layer is in an unexpanded thermoplastic material, compatible with the mine material and the wood material and having a melting temperature which is equal to or greater than both the melting temperature of the material mine and to that of the wood material.
  • This particular selection of the thermoplastic material constituting the intermediate protective layer is intended to avoid defects due to the presence of bubbles on the outer periphery of the mine material, which have been observed during the manufacture of rods by extrusion using an expansion agent in the wood material. Because of its melting temperature, the thermoplastic material constituting the protective layer is less fluid than the mine and wood materials. As a result, it does not deform under the effect of the bubbles released on the surface of the wood material and constitutes a protective barrier for the mine material.
  • the problem that the present invention seeks to solve is of another order. It also relates to the continuous manufacture by co-extrusion of a pencil to write or color from thermoplastic materials. It has indeed been noted the presence of another type of defect, namely cracking of the mine, resulting in frequent breaks especially when the size of the pencil.
  • the goal set by the applicant is to propose a manufacturing process that overcomes the aforementioned drawback, avoiding the occurrence of such cracks.
  • thermoplastic material referred to as a mine material
  • protective intermediate layer in a material thermoplastic material free of blowing agent and a second thermoplastic material containing a blowing agent, referred to as wood material, and cooling said coextruded thermoplastics.
  • thermoplastic material constituting the protective layer is determined so as to remain deformable during removal of the mine material, during cooling.
  • thermoplastic material constituting the protective layer is chosen so that its solidification point is less than the solidification point of the thermoplastic material constituting the lead material.
  • the mine material will solidify first with respect to the protective layer, because its solidification point (c that is, the temperature from which the thermoplastic which was in the plastic or molten state begins to solidify) is greater than that of the thermoplastic material constituting the protective layer.
  • solidification point c that is, the temperature from which the thermoplastic which was in the plastic or molten state begins to solidify
  • the removal of the mine material that occurs during the solidification will proceed while the mine material is surrounded by the protective layer which is not yet solidified but which is in a deformable state.
  • This protective layer by its deformability and flexibility, allows the mine material to release its internal stresses and thus retract without cracking appear. The actual solidification of the protective layer occurs later.
  • the distance between the solidification points of the lead material and the protective layer is of the order of 10 to 20 ° C.
  • the additive is preferably an elastomer thermoplastic or an ethyl vinyl acetate copolymer (EVA).
  • this pencil is constituted by the superposition of a core in a first filled thermoplastic material called mine material, a protective layer of a non-foamed thermoplastic material and a layer of a second thermoplastic material expanded called wood material.
  • the thermoplastic material constituting the protective layer has a solidification point which is lower than that of the thermoplastic material constituting the lead material.
  • the protective layer contains an elastomeric thermoplastic or an ethyl-vinyl-acetate (EVA) copolymer.
  • EVA ethyl-vinyl-acetate
  • the protective layer comprises, as thermoplastic material, a styrenic polymer.
  • the protective layer comprises from 70 to 95% of a styrene compound and from 5 to 30% of an elastomeric thermoplastic or of an ethyl-vinyl-acetate copolymer.
  • thermoplastic material constituting the protective layer a material which does not solidify after cooling but which is heat-deformable remains flexible. It may be in particular an elastomeric thermoplastic material.
  • the central core constitutes the mine material 1
  • the intermediate layer constitutes the protective layer 2
  • the outer layer is the wood material 3 of a pencil 4 manufactured continuously.
  • thermoplastic materials are determined so that each corresponding element has the properties that are expected: the entire pen must have a good cut and a density close to that of the traditional wooden pencil. Regarding the mine material, it must include charges for writing and be easily transferable on the writing medium or coloring to have a good hiding power.
  • the corresponding components are for example chosen from those described in document FR.1.588.294.
  • the wood material to obtain the desired density, it contains an expanding agent for example azo-dicarbonamide.
  • the protective layer 2 which is free of foaming agent, it must be compatible with the mine material 1 and the wood material 2 so as to ensure the good behavior of the mine in the pencil .
  • the constituent material of the protective layer is chosen to have a solidification point which is lower, or even significantly lower, than that of the thermoplastic material constituting the mine.
  • the solidification point is also commonly referred to as the softening point. It is the temperature (or temperature zone) from which the material in the plastic or molten state begins to solidify. It is also the temperature (or temperature zone) from which the solid state thermoplastic material begins to soften. It is also called VICAT point.
  • the lead material 1 solidifies more rapidly than the protective layer. It is during this solidification that the phenomenon of shrinkage occurs which develops in the material mine internal stresses, constraints which are a function of the composition of the mine material and its diameter. According to the invention, the solidification of the ore material occurs while the protective layer has not yet begun to solidify, is still in a deformable state (pasty or in any case flexible). As a result, the constituent material of the protective layer will accompany, by deforming, the removal of the mine material, which prevents the subsequent appearance of cracks.
  • the function of the protective layer is to compensate for the difference in shrinkage coefficient between the thermoplastics constituting the material on the one hand and the wood material on the other hand, while realizing the mechanical connection between these two materials, once the full solidification of the pencil has occurred. It is important that there remains a mechanical connection between the mine and the rest of the pen.
  • This layer of protection which in this case preferably has a thickness of at least 0.5 mm, can act as a reinforcement for the mine material, ensuring consolidation of the mine capable of significantly reducing the risk of breakage when using the pencil.
  • the protective layer also fulfill the function assigned to it in document EP.0.505.262, namely to form a barrier for the material which is a material against the scattering of bubbles from the wood material.
  • the thermoplastic material constituting the protective layer which is free of expansion agent and which is compatible with the lead material and the wood material, has a melting temperature which is equal to or greater than both the melting temperature of the mine material and that of the wood material.
  • the composition of the mine 1 material is as follows: polystyrene methacrylate copolymer : 20 - 25% plasticizer 15% carbon black 55% black smoke : 5% zinc stearate 0.5% talc 4.5%
  • the composition of the protective layer 2 is as follows: styrenic polymer 80% Ethyl vinyl acetate EVA copolymer : 20%
  • the composition of the wood material 3 is as follows: polystyrene-methacrylate copolymer 78.5% plasticizer phthalate type : 10% sawdust : 10% pigments (masterbatch) 1.5% Just before extrusion, the wood material is mixed with about 2% of a masterbatch containing azo-dicarbonamide as blowing agent.
  • the protective layer can also be tinted with a masterbatch so that the protective layer 2 has the same color as the wood material 3 or be tinted with another color to make it more visible.
  • the solidification point or Vicat A point (ISO 306), for the various thermoplastic constituents above is: . methacrylate 100 to 110 ° C . polystyrene shock 92 to 95 ° C . ABS 104 to 110 ° C . ethyl-vinyl-acetate copolymer 40 to 44 ° C
  • an elastomeric thermoplastic for example SBS (Styrene Butadiene Styrene) having a Shore hardness of 50 to 70.
  • the wood material 3 is unchanged.
  • composition of the mine 1 material is as follows: . polystyrene methacrylate copolymer : 25% . plasticizer phthalate type 15% . colored pigments : 25% . zinc stearate 0.5% . talc 34.5%
  • the composition of the protective layer 2 is as follows: . styrenic polymer 83% . ethyl vinyl acetate copolymer (EVA) 15% . masterbatch pigment : 2%
  • the composition of the protective layer 2 would have been the following: . styrenic polymer 88% . thermoplastic elastomer : 10% . masterbatch pigment : 2%
  • the present invention is not limited to the embodiments which have been described by way of non-exhaustive examples. It is possible to implement other basic components for the lead material and the wood material than the polystyrene methacrylate copolymer. In addition it is possible to give the pencil any type of configuration, without limitation to the hexagonal shape. It can be a circular, triangular, octagonal shape, without this list being exhaustive. It is also possible to use for the protective layer a thermoplastic material which not only is hot deformable (during removal of the mine) but does not solidify and remains flexible after complete cooling of the pencil, for example based on thermoplastic elastomer.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Claims (10)

  1. Verfahren zur kontinuierlichen Herstellung von Stiften zum Schreiben oder Kolorieren durch gleichzeitige Co-Extrusion, bestehend aus dem Co-Extrudieren eines ersten, Minenmaterial genannten beschickten thermoplastischen Materials und um jenes herum einer Schutzschicht genannten Zwischenschicht aus einem thermoplastischen Material, das frei von Treibmittel ist, und eines zweiten, Holzmaterial genannten thermoplastischen Materials, das ein Treibmittel enthält, und aus dem Kühlen der co-extrudierten thermoplastischen Materialien, dadurch gekennzeichnet, daß der Verfestigungspunkt des thermoplastischen Materials, das die Schutzschicht bildet, unter dem Verfestigungspunkt des thermoplastischen Materials liegt, das das Minenmaterial bildet, derart, daß die Schutzschicht während des Schrumpfens des Minenmaterials beim Kühlen verformbar bleibt.
  2. Verfahren nach Anspruch 1 zur Herstellung von Stiften mit weicher Miene.
  3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Abstand zwischen den Verfestigungspunkten des Minenmaterials und der Schutzschicht in der Größenordnung von 10 bis 20°C liegt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zum Absenken des Verfestigungspunktes der Schutzschicht man als Zusatz entweder ein thermoplastisches Elastomer oder ein Ethyl-Vinylacetat-Copolymer (EVA) einsetzt.
  5. Stift, erhalten durch gleichzeitige Co-Extrusion bestehend aus der Überlagerung eines Kerns aus einem ersten, Minenmaterial genannten thermoplastischen beschickten Material, einer Schutzschicht aus einem nicht expandierten thermoplastischen Material und einer Schicht aus einem zweiten, Holzmaterial genannten expandierten thermoplastischen Material, dadurch gekennzeichnet, daß das thermoplastische Material, das die Schutzschicht bildet, einen Verfestigungspunkt besitzt, der unter jenem des thermoplastischen Materials liegt, das das Minenmaterial bildet.
  6. Stift nach Anspruch 5, dadurch gekennzeichnet, daß die Schutzschicht ein thermoplastisches Elastomer oder ein Ethyl-Vinylacetat-Copolymer (EVA) enthält.
  7. Stift nach Anspruch 5, dadurch gekennzeichnet, daß die Schutzschicht als thermoplastisches Material ein Styrolpolymer umfaßt.
  8. Stift nach Anspruch 6, dadurch gekennzeichnet, daß die Schutzschicht 70 bis 95% einer Styrolverbindung und 5 bis 30% eines thermoplastischen Elastomers oder eines Ethyl-Vinylacetat-Copolymers umfaßt.
  9. Stift nach Anspruch 5, gebildet durch die Überlagerung eines Kerns aus einem ersten, Minenmaterial genannten beschickten thermoplastischen Material, einer Schutzschicht aus einem nicht-expandierten thermoplastischen Material und einer Schicht aus einem Holzmaterial genannt expandierten thermoplastischen Material, dadurch gekennzeichnet, daß die Schutzschicht wärmeverformbar ist und nach Abkühlen elastisch bleibt.
  10. Stift nach Anspruch 9, dadurch gekennzeichnet, daß die Schutzschicht aus einem thermoplastischen Elastomer besteht.
EP00985357A 1999-12-13 2000-11-29 Verfahren zur herstellung eines stiftes durch tri-extrusion und stift mit einer schutzschicht Expired - Lifetime EP1150847B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9915696 1999-12-13
FR9915696A FR2802148B1 (fr) 1999-12-13 1999-12-13 Procede de fabrication par tri-extrusion d'un crayon a ecrire ou a colorier et crayon a ecrire ou a colorier comportant une couche intermediaire de protection
PCT/FR2000/003334 WO2001043987A1 (fr) 1999-12-13 2000-11-29 Procede de fabrication par tri-extrusion d'un crayon a ecrire ou a colorier et crayon a ecrire ou a colorier comportant une couche intermediaire de protection

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Publication Number Publication Date
EP1150847A1 EP1150847A1 (de) 2001-11-07
EP1150847B1 true EP1150847B1 (de) 2007-03-28

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EP00985357A Expired - Lifetime EP1150847B1 (de) 1999-12-13 2000-11-29 Verfahren zur herstellung eines stiftes durch tri-extrusion und stift mit einer schutzschicht

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Country Link
US (1) US6572295B1 (de)
EP (1) EP1150847B1 (de)
JP (1) JP4934260B2 (de)
AR (1) AR030173A1 (de)
AT (1) ATE358029T1 (de)
AU (1) AU2180301A (de)
BR (1) BR0007874A (de)
CA (1) CA2362775C (de)
DE (1) DE60034108T2 (de)
DZ (1) DZ3144A1 (de)
EG (1) EG23174A (de)
ES (1) ES2284550T3 (de)
FR (1) FR2802148B1 (de)
HK (1) HK1043769B (de)
MA (1) MA25343A1 (de)
MX (1) MXPA01008169A (de)
PT (1) PT1150847E (de)
WO (1) WO2001043987A1 (de)

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FR3030364B1 (fr) 2014-12-17 2017-01-13 Conte Mine de crayon a papier
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Publication number Priority date Publication date Assignee Title
DE202011103995U1 (de) 2011-07-28 2012-11-15 J. S. Staedtler Gmbh & Co. Kg Schreib-, Zeichen-, Mal- oder Kosmetikgerät umfassend einen Wabenkörper
DE102012000269A1 (de) 2011-07-28 2013-01-31 J. S. Staedtler Gmbh & Co. Kg Schreib-, Zeichen-, Mal- oder Kosmetikgerät umfassend einen Wabenkörper sowie Verfahren zur Herstellung des Wabenkörpers oder des Gerätes umfassend einen Wabenkörper
WO2013013762A1 (de) 2011-07-28 2013-01-31 J.S. Staedtler Gmbh & Co. Kg Schreib-, zeichen-, mal- oder kosmetikgerät umfassend einen wabenkörper sowie ein verfahren zur herstellung des wabenkörpers oder des gerätes umfassend einen wabenkörper
DE102012000269B4 (de) 2011-07-28 2023-11-02 Staedtler Mars Gmbh & Co. Kg Schreib-, Zeichen-, Mal- oder Kosmetikgerät umfassend einen Wabenkörper sowie Verfahren zur Herstellung des Wabenkörpers oder des Gerätes umfassend einen Wabenkörper

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FR2802148B1 (fr) 2003-01-24
HK1043769A1 (en) 2002-09-27
EP1150847A1 (de) 2001-11-07
MXPA01008169A (es) 2004-04-05
US6572295B1 (en) 2003-06-03
MA25343A1 (fr) 2001-12-31
AU2180301A (en) 2001-06-25
DE60034108T2 (de) 2007-12-06
JP2003516888A (ja) 2003-05-20
ES2284550T3 (es) 2007-11-16
CA2362775A1 (fr) 2001-06-21
ATE358029T1 (de) 2007-04-15
PT1150847E (pt) 2007-06-21
EG23174A (en) 2004-06-30
JP4934260B2 (ja) 2012-05-16
FR2802148A1 (fr) 2001-06-15
AR030173A1 (es) 2003-08-13
DZ3144A1 (fr) 2001-06-21
CA2362775C (en) 2007-01-30
BR0007874A (pt) 2001-10-16
WO2001043987A1 (fr) 2001-06-21
DE60034108D1 (de) 2007-05-10
HK1043769B (zh) 2007-09-28

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