EP1150847A1 - 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

Info

Publication number
EP1150847A1
EP1150847A1 EP00985357A EP00985357A EP1150847A1 EP 1150847 A1 EP1150847 A1 EP 1150847A1 EP 00985357 A EP00985357 A EP 00985357A EP 00985357 A EP00985357 A EP 00985357A EP 1150847 A1 EP1150847 A1 EP 1150847A1
Authority
EP
European Patent Office
Prior art keywords
protective layer
thermoplastic material
thermoplastic
pencil
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.)
Granted
Application number
EP00985357A
Other languages
English (en)
French (fr)
Other versions
EP1150847B1 (de
Inventor
Ludovic Chochoy
Hélène BAILLIEU
Jacques Bachelet
Lucien Foscarin
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.)
Conte SA
Original Assignee
Conte SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9553187&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1150847(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Conte SA filed Critical Conte SA
Publication of EP1150847A1 publication Critical patent/EP1150847A1/de
Application granted granted Critical
Publication of EP1150847B1 publication Critical patent/EP1150847B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 successively constituting on the one hand the mine and on the other hand the material which surrounds the mine, called wood material in the rest of this text by analogy with the composition of traditional pencils, in which this material is made of wood. It relates more particularly to a process by tri-extrusion of thermoplastic materials according to which an intermediate protective layer is co-extruded between the mine and the wood material. It also relates to a writing or coloring pencil, capable of being obtained 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.O.5O5.262.
  • the intermediate protective layer is made of a non-expanded thermoplastic material, compatible with the lead material and the wood material and having a melting temperature which is equal to or greater than both the melting temperature of the lead material and to that of wood.
  • This particular selection of the thermoplastic material constituting the intermediate protective layer aims to avoid defects due to the presence of bubbles on the outer periphery of the lead material, which have been observed during the manufacture of pencils by bi- extrusion using a blowing agent in the wood material.
  • thermoplastic material constituting the protective layer Due to 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 which the present invention seeks to solve is of another order. It also relates to the continuous production by co-extrusion of a pencil to write or color from thermoplastics. It was indeed found the presence of another type of defect, namely cracking of the mine, resulting in frequent breaks especially during the sharpening of the pencil.
  • the goal that the applicant has set is to propose a manufacturing process which overcomes the aforementioned drawback, avoiding the appearance of such cracks.
  • the thermoplastic material constituting the protective layer is determined so as to remain deformable during the removal of the lead material, during cooling.
  • the thermoplastic material constituting the protective layer is chosen so that its solidification point is lower 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 point of solidification (c that is to say the temperature at which the thermoplastic material which was in the plastic or molten state begins to solidify) is higher than that of the thermoplastic material constituting the protective layer.
  • the removal of the mine material which occurs during the solidification will take place 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 its flexibility, allows the mine material to be released from its internal stresses and therefore to shrink without cracking appearing. The solidification proper of the protective layer occurs later.
  • the difference between the solidification points of the lead material and of the protective layer is of the order of 10 to 20 ° C.
  • an elastomeric thermoplastic or an ethyl-vinyl-acetate copolymer (EVA) is used as an additive.
  • this pencil is constituted by the superposition of a core made of a first charged thermoplastic material called mine material, a protective layer of an unexpanded 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 copolymer (EVA).
  • EVA ethyl-vinyl-acetate copolymer
  • the protective layer comprises, as thermoplastic material, a styrenic polymer.
  • the protective layer comprises from 70 to 95% of a styrenic 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 being deformable when hot remains flexible. It may especially be an elastomeric thermoplastic material.
  • FIG. 1 is a representation in the form of a diagram of the steps of the tri-extrusion
  • FIG. 2 is a perspective view of the pencil with flexible protective layer according to the invention
  • the central core constitutes the lead material 1
  • the intermediate layer constitutes the protective layer 2
  • the outer layer constitutes the wood material 3 of a pencil 4 produced continuously
  • thermoplastic materials are determined so that each corresponding element has the properties that one expects.
  • the whole of the pencil must have good cutability and a density close to that of the traditional wooden pencil. -this must include fillers for writing and be easily transferable to the writing or coloring support to have good covering 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 expanding agent, it must be compatible. on the one hand with the lead material 1 and the wood material 2 so as to ensure the good behavior of the lead in the pencil
  • the constituent material of the protective layer is chosen to have a solidification point which is lower, even clearly lower than that of the thermoplastic material making up the mine
  • the solidification point is also commonly referred to as the softening point. It is the temperature (or the temperature zone) from which the material in the plastic or molten state begins to solidify It is also the temperature (or the temperature zone) from which the thermoplastic material the solid state begins to soften It is also called NICAT point
  • the lead material 1 solidifies more quickly than the protective layer It is during this solidification that the phenomenon of shrinking occurs which develops in the lead material internal stresses, stresses which are a function of the composition of the lead material and its diameter
  • the solidification of the lead material occurs while the protective layer has not yet started to solidify, is still in a deformable state (pasty or in any case flexible)
  • the material constituting the protective layer will accompany, by deforming, the withdrawal of the mine material, which avoids the subsequent appearance cracks
  • the protective layer has the function of compensating for the difference in shrinkage coefficient between the thermoplastic materials constituting the lead material on the one hand and the wood material on the other hand, while carrying out the mechanical connection between these two materials, once the integral solidification of the pencil has taken place It is indeed important that a mechanical connection remains between the mine and the rest of the pencil
  • the protective layer which in this case preferably has a thickness at least equal to 0.5mm, can act as reinforcement for the mine material, ensuring a consolidation of the mine capable of significantly reducing the risk of breakage when using the pencil safe in the case of a wood material with foaming agent, it is desirable that the protective layer also fulfills the function which was assigned to it in document EP 0 505 262, namely to form a barrier for the mine material against the diffusion of bubbles from the wood material
  • the thermoplastic material constituting the protective layer which is free of blowing agent and which is compatible with the mine material and the wood material, has a melting temperature which is equal or higher both the melting temperature of the mine material and that of the wood material Example 1
  • the composition of the mine 1 material is as follows: methacrylate polystyrene copolymer 20 - 25% plasticizer 15% carbon black 55% smoke black 5% zinc stearate 0.5 % talc 4.5%
  • the composition of the protective layer 2 is the following styrenic polymer 80% ethyl vinyl acetate copolymer EVA 20%
  • the composition of the wood material 3 is the following polystyrene-methacrylate copolymer 78.5% plasticizer of the phthalate type 10% sawdust 10 % pigments (masterbatch) 1.5%
  • the wood material is mixed in the order of 2% of a masterbatch containing Fazo-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 can be tinted with another color to make it more visible.
  • the solidification point or Vicat point A (ISO 306), for the various thermoplastic constituents above is from methacrylate lOO to lO impact polystyrene 92 at 95 ° C.
  • ABS. l04 at lO ° C ethyl-vinyl-acetate copolymer 40 to 44 ° C
  • ethyl-vinyl-acetate copolymer 40 to 44 ° C The presence of ethyl-vinyl-acetate copolymer, even in small proportions, makes it possible to lower the solidification point of the protective layer compared to the mine material and the wood material
  • an elastomeric thermoplastic for example type SB S (Styrene Butadiene Styrene) of Shore hardness 50 to 70
  • a pencil 4 of hexagonal configuration is obtained which, once cut (FIG. 2), reveals between the lead material and the wood material 3 the protective layer 2 which in the case had a thickness of 0.3 mm for a pencil 4 of about 7 mm between flat and a wealth of about 2 mm in diameter
  • the composition of the lead material 1 is the following polystyrene methacrylate copolymer 25% plasticizer of the phthalate type 15% colored pigments 25% zinc stearate 0.5% talc 34.5%
  • the composition of the protective layer 2 is the following styrenic polymer 83% . ethyl vinyl acetate copolymer (EVA): 15%
  • master pigment blend 2%
  • thermoplastic elastomer of the SBS type
  • composition of the protective layer 2 would have been as follows:. styrenic polymer: 88% thermoplastic elastomer: 10%
  • the present invention is not limited to the embodiments which have been described by way of non-exhaustive examples. It is possible to use other basic components for the lead material and the wood material than the polystyrene methacrylate copolymer. In addition it is possible to give in pencil any type of configuration, without limitation to the hexagonal shape II 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 deformable when hot (when the mine is removed) but which 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)
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

Publications (2)

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

Family

ID=9553187

Family Applications (1)

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

Country Status (18)

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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US9579865B2 (en) 2011-07-28 2017-02-28 Staedtler Mars Gmbh & Co. Kg Writing, drawing, painting or cosmetic device comprising a honeycomb body, and method for producing the honeycomb body or the device comprising a honeycomb body

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EP2666803B1 (de) 2012-05-23 2018-09-05 Ems-Patent Ag Kratzfeste, transparente und zähe Copolyamidformmassen, hieraus hergestellte Formkörper und deren Verwendung
EP2716716B1 (de) 2012-10-02 2018-04-18 Ems-Patent Ag Polyamid-Formmassen und deren Verwendung bei der Herstellung von Formkörpern
SI2746339T1 (sl) 2012-12-18 2015-05-29 Ems-Patent Ag Poliamidna oblikovalna masa in oblikovalni deli proizvedeni iz enakega
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FR3030364B1 (fr) 2014-12-17 2017-01-13 Conte Mine de crayon a papier
FR3030366B1 (fr) 2014-12-17 2017-01-13 Conte Mine de crayon de couleur
FR3030365B1 (fr) * 2014-12-17 2017-01-13 Conte Crayon a ecrire ou a colorier
FR3052705B1 (fr) 2016-06-21 2018-07-13 Conte Crayon a ecrire ou a colorier
FR3065006B1 (fr) 2017-04-10 2019-06-21 Societe Bic Mine de crayon a papier
MX2021006354A (es) 2018-12-18 2021-08-11 SOCIéTé BIC Revestimiento de mina para lapiz y lapiz de este para escribir, dibujar, marcar, trazar y colorear.
US20220063321A1 (en) 2018-12-18 2022-03-03 SOCIéTé BIC Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
CN113165416B (zh) 2018-12-18 2023-05-16 法国比克公司 铅笔用铅套以及用于书写、绘画、做标记、绘制和上色的包括铅笔用铅套的铅笔
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Also Published As

Publication number Publication date
FR2802148B1 (fr) 2003-01-24
HK1043769A1 (en) 2002-09-27
MXPA01008169A (es) 2004-04-05
EP1150847B1 (de) 2007-03-28
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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