EP2730428A1 - Mehrkomponenten-Schreibvorrichtung und Verfahren zu ihrer Herstellung - Google Patents

Mehrkomponenten-Schreibvorrichtung und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP2730428A1
EP2730428A1 EP13005329.1A EP13005329A EP2730428A1 EP 2730428 A1 EP2730428 A1 EP 2730428A1 EP 13005329 A EP13005329 A EP 13005329A EP 2730428 A1 EP2730428 A1 EP 2730428A1
Authority
EP
European Patent Office
Prior art keywords
base material
writing
peripheral surface
elongate body
polymer
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
EP13005329.1A
Other languages
English (en)
French (fr)
Other versions
EP2730428B1 (de
EP2730428B8 (de
Inventor
Andrea Zandona'
Susanna Martucci
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.)
SU S.R.L
Original Assignee
AZ Solutions Srl
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 AZ Solutions Srl filed Critical AZ Solutions Srl
Publication of EP2730428A1 publication Critical patent/EP2730428A1/de
Publication of EP2730428B1 publication Critical patent/EP2730428B1/de
Application granted granted Critical
Publication of EP2730428B8 publication Critical patent/EP2730428B8/de
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Anticipated expiration legal-status Critical

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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
    • B43K19/02—Pencils with graphite; Coloured pencils
    • 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
    • B43K19/14—Sheathings
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K29/00—Combinations of writing implements with other articles
    • B43K29/007—Combinations of writing implements with other articles with advertising means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K29/00—Combinations of writing implements with other articles
    • B43K29/02—Combinations of writing implements with other articles with rubbers

Definitions

  • the present invention generally finds application in the field of writing and drawing tools and particularly relates to a multicomponent writing device.
  • the invention also relates to a method of manufacturing such multicomponent writing device.
  • Black and colored pencils and similar writing devices are known to typically comprise a lead having writing properties, encapsulated in a protective enclosure.
  • the lead may be made of a mixture comprising graphite as a main material, and additional components, such as waxes, clay and polymer materials.
  • JP9118856 discloses a lead obtained from a graphite matrix with a vinyl chloride resin mixed therein.
  • the protective enclosure is generally made of wood or a relatively rigid polymer material.
  • EP0325923 discloses a method of manufacturing a pencil, in which the graphite lead is placed within a tube, with a heat-shrink plastic material being later introduced into the tube such that, as the assembly is heated, the plastic material and the lead are joined together.
  • Pencils are further known, mainly in the field of artistic drawing, which simply consist of the graphite-based lead and, unlike conventional pencils, have no outer protective enclosure.
  • the graphite body is generally covered with a polymeric film, which provides a better grip and prevents graphite powder from depositing on the fingers.
  • JP2008189873 discloses a pencil with a writing body composed of a graphite/resin mixture and covered with an EVA membrane to prevent hand contact with the material having writing properties.
  • CN2889735 discloses a pencil that is entirely made of graphite, whose writing body is coated with a UV oil finishing layer fixed by UV radiation.
  • the polymer coating only defines a protective sheath applied to the writing body once it has been formed, e.g. by thermoforming.
  • a further important drawback is that these pencils cannot receive an eraser mounted to the non-writing end, such eraser being generally held, in conventional pencils, in a seat defined by a metal ferrule attached to the enclosure by interference fit, as disclosed, for instance, in US 5774931 .
  • the object of the present invention is to obviate the above drawbacks, by providing a multicomponent writing device that is highly efficient and relatively cost-effective.
  • a particular object is to provide a multicomponent writing device that has a protective film stably applied to the writing body.
  • Yet another object is to provide a multicomponent writing device that has high mechanical properties, and namely a high strength, to ensure that it will preserve its integrity even when it falls.
  • a particular object is to provide a multicomponent writing device that is mostly obtained from recycled materials.
  • a further object is to provide a multicomponent writing device that also has an erasing element integrated therewith without affecting its aesthetic profile.
  • Another important object of the present invention is to provide a method of manufacturing the above mentioned multicomponent writing device, that is remarkably time-efficient and can provide a device with high structural stability.
  • the protective film will be perfectly integrated in the writing body and, in addition, the binding material will also impart high strength to the device and prevent it from breaking when it is accidentally dropped.
  • the invention relates to a method of manufacturing the device, as defined in claim 7.
  • numeral 1 generally designates a multicomponent writing device of the invention.
  • the device may be a black pencil, like in Fig. 1 , a colored pencil or another similar writing tool, which can write on any medium, and particularly on paper of any type and thickness.
  • the device 1 basically comprises an elongate body 2 which has an outer peripheral surface 3 and is made from a mixture comprising a first base material with writing properties and a second base material dispersed in the first material and having binding properties.
  • the second base material is dispersed in the first base material, with an increasing concentration from the interior to the peripheral surface 3, to define an outer layer 4.
  • the outer layer 4 is adapted to substantially entirely encircle the outer peripheral surface 3, while preferably exposing at least one substantially pointed end 5 of the elongate body 2, having a greater concentration of the first base material, and adapted to be used for writing.
  • the outer layer 4 provides protection to the hands of a user that contact the outer surface 3 of the elongate body 2.
  • the outer layer 4 is not an element designed to be simply joined and wrapped around the peripheral surface 3 of the writing body 2 and as such distinct and separable therefrom. Conversely, the outer layer 4 is stably associated with the elongate body 2 and cannot be separated therefrom.
  • the second base material is substantially present throughout the whole writing body 2, although with decreasing concentrations towards the inner portions, as schematically shown in the sequence of Fig. 2 , it will impart greater cohesion to the first material.
  • the second material helps to improve the mechanical properties of the device 1 and particularly increases its impact and drop resistance.
  • the first base material is a powder, e.g. an organic mineral powder.
  • the first material is graphite powder, which is known to be the most suitable material for writing.
  • Graphite may be obtained from any source and using any production method. Nevertheless, in a preferred embodiment, a predetermined graphite amount, preferably above 80% by weight based on the total amount of the first material, may be obtained by recycling graphite powder produced in industrial electrical discharge machining processes.
  • Graphite is particularly suitable if the writing device 1 is designed to be used as a black pencil. If the device 1 is designed for use as a colored pencil or the like, the first base material may comprise or be composed of a pigmented powder, of either mineral or synthetic nature.
  • the first base material may be selected from earth material, such as clay or the like, or synthetic or natural waxes with other relatively plastic materials, according to the particular type of writing device to be obtained.
  • the second base material may be selected from the group comprising polymer materials and its amount in the starting mixture may range from 10% to 30% and be preferably about 20% based on the total weight of the mixture.
  • the second base material may be any polymer material, with no particular limitation. Nevertheless, in a preferred embodiment, it may be selected from polyethylenes, such as low density polyethylene (LDPE), which exhibits improved dispersion in graphite powder.
  • LDPE low density polyethylene
  • the writing body 2 may also comprise additional additives, which may be selected from the additives that are typically used in the manufacture of similar devices or in the manufacture of black and colored pencils, such as clay, waxes and other binders, to alter the mechanical properties of the writing body 2, namely hardness, or its writing features, particularly the tone and thickness of the writing mark.
  • additional additives may be selected from the additives that are typically used in the manufacture of similar devices or in the manufacture of black and colored pencils, such as clay, waxes and other binders, to alter the mechanical properties of the writing body 2, namely hardness, or its writing features, particularly the tone and thickness of the writing mark.
  • the writing body 2 may be shaped with the typical substantially cylindrical shape of black and colored pencils, although in the figures herewith it is shown with a substantially flat longitudinal face 6 which is adapted to receive various texts and indications.
  • the writing body 2 has a substantially pointed first end 5 and a substantially flat second end 7, opposite to the first end, which may optionally have an erasing element 8 associated therewith, for removing the writing marks produced by the writing body 2 on the writing medium.
  • the erasing element 8 may be made of a third polymer material having chemical affinity or compatibility with the second polymer material.
  • the erasing element 8 may be co-molded with the writing body and have a substantially cylindrical shape with an outer profile that follows the outer profile of the writing body, to define an extension thereof, and avoid the use of external anchor means, such as the metal ferrules that are generally used in common pencils.
  • the invention relates to a method of manufacturing the above mentioned multicomponent writing device.
  • Fig. 2 shows a cross section of the device 1 through three distinct steps of the manufacturing process.
  • the method is characterized in that it comprises the steps of a) providing a first predetermined amount of a first base material with writing properties and a second predetermined amount of a second material with binding properties, b) providing a mold 9, as schematically shown in Fig. 3 , having a specially shaped inner cavity 11 with a peripheral surface 11 heated to a predetermined temperature and c) co-injecting the first and second amounts of the first and second materials into the cavity 10 to obtain a writing body 2 whose shape is complementary to that of the cavity 10.
  • the second material has a higher fluidity than the first material, such that it will flow with a higher concentration toward the peripheral surface 11 of the cavity 10 and define an outer layer 4 of the writing body 2 that is stably associated therewith and cannot be separated as a whole from its peripheral surface 3.
  • the heating temperature of the inner peripheral surface 11 of the cavity 10 may range from 150°C to 300°C and is preferably about 200°C.
  • the walls 12 of the mold 9 may be associated with appropriate heating means 13, as schematically shown in this figure, such as electrical resistors, radiant means or the like, with no particular limitation.
  • a step of d) mixing the first and second amounts of the first and second materials may be provided upstream from the co-injection step.
  • the first material is a powder as mentioned above
  • the second material is a fluid or semifluid polymer material, for carrying the first material in the co-injection molding process.
  • the different fluidities of the two materials will cause the more fluid material, i.e. the second polymer material that also acts as a binder, to migrate toward the hotter peripheral surface 11 of the cavity 10 and hence to be present with a higher concentration at the periphery 3 of the writing body 2, thereby defining the outer layer 4.
  • the more fluid material i.e. the second polymer material that also acts as a binder
  • the molding times and rates will not allow the entire amount of the second material to reach the periphery, whereby the second material will be dispersed in the first material to act as a binder.
  • the starting mixture may comprise additional additives in minor amounts as compared with the first and second base materials.
  • the molding step c) may be carried out by co-injecting the respective amounts of both materials at the same time but separately, i.e. without previously mixing them, because the temperatures in the mold 9 will allow them to mix during the process and cause the second material to be dispersed in the first material and thus act as a binder.
  • the first powder material will be injected into the mold 9 at a predetermined pressure, sufficient to cause at least partial sintering of the powder and form a writing body with increased compactness.
  • the pressure values will depend on the materials being used, as is known to the skilled person, and will not limit the present invention.
  • the method may comprise a step of e) molding the above mentioned erasing element 8 made of at least one third polymer material having chemical compatibility or affinity with the second polymer material, on the writing body 2.
  • This additional molding step may either be a co-molding step, to be carried out at the same time as the step of c) co-injecting the first and second materials or immediately after it, or be carried out after removal of the device 1 from the mold 9.
  • the method may be complemented by additional device shaping or finishing steps, according to the shape and physical and mechanical characteristics to be imparted to the finished product, which are not described herein as they are within the reach of the skilled person.
  • the present invention fulfills the intended objects and particularly meets the requirement of providing a multicomponent writing device having high structural strength, superior aesthetic quality and low environmental impact.

Landscapes

  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Holo Graphy (AREA)
  • Facsimile Heads (AREA)
  • Numerical Control (AREA)
EP13005329.1A 2012-11-12 2013-11-12 Mehrkomponenten-Schreibvorrichtung und Verfahren zu ihrer Herstellung Active EP2730428B8 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000305A ITVI20120305A1 (it) 2012-11-12 2012-11-12 Dispositivo di scrittura multicomponente e metodo per la realizzazione di tale dispositivo

Publications (3)

Publication Number Publication Date
EP2730428A1 true EP2730428A1 (de) 2014-05-14
EP2730428B1 EP2730428B1 (de) 2016-03-16
EP2730428B8 EP2730428B8 (de) 2016-07-13

Family

ID=47633477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13005329.1A Active EP2730428B8 (de) 2012-11-12 2013-11-12 Mehrkomponenten-Schreibvorrichtung und Verfahren zu ihrer Herstellung

Country Status (3)

Country Link
EP (1) EP2730428B8 (de)
ES (1) ES2574423T3 (de)
IT (1) ITVI20120305A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3098145A1 (fr) 2019-07-01 2021-01-08 Maped Instrument d’ecriture

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191312109A (en) * 1913-05-24 1913-12-18 Anton Herda Process for Producing a Substance for Manufacturing Water and Temperature Proof Coloured Marking Chalk or Pencils, Artist's Crayons and the like.
EP0325923A2 (de) 1988-01-19 1989-08-02 Caran D'ache S.A. Verfahren zum Umhüllen von Bleistiften und ein nach diesem Verfahren hergestellter Bleistift
JPH09118856A (ja) 1995-10-26 1997-05-06 Mitsubishi Pencil Co Ltd 焼成鉛筆芯の製造方法
US5774931A (en) 1995-07-17 1998-07-07 Conte S.A. Pencil having an eraser-holding ferrule secured by ultrasonic welding, and a ferrule adapted for that purpose
DE102004021048A1 (de) * 2004-04-29 2005-11-24 Poloplast Gmbh & Co.Kg Stift zum Schreiben, Zeichnen, Malen oder Ähnlichem
US20060222443A1 (en) * 2005-04-04 2006-10-05 Eileen Savage Marker implement
CN2889735Y (zh) 2006-03-30 2007-04-18 李宪祎 无木石墨绘画笔
JP2008189873A (ja) 2007-02-07 2008-08-21 Tombow Pencil Co Ltd 手が汚れない鉛筆またはシャープペンシル用芯
EP2053105A1 (de) * 2006-07-12 2009-04-29 Sakura Color Products Corporation Verfahren zur herstellung einer schwarzen wachskreide

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191312109A (en) * 1913-05-24 1913-12-18 Anton Herda Process for Producing a Substance for Manufacturing Water and Temperature Proof Coloured Marking Chalk or Pencils, Artist's Crayons and the like.
EP0325923A2 (de) 1988-01-19 1989-08-02 Caran D'ache S.A. Verfahren zum Umhüllen von Bleistiften und ein nach diesem Verfahren hergestellter Bleistift
US5774931A (en) 1995-07-17 1998-07-07 Conte S.A. Pencil having an eraser-holding ferrule secured by ultrasonic welding, and a ferrule adapted for that purpose
JPH09118856A (ja) 1995-10-26 1997-05-06 Mitsubishi Pencil Co Ltd 焼成鉛筆芯の製造方法
DE102004021048A1 (de) * 2004-04-29 2005-11-24 Poloplast Gmbh & Co.Kg Stift zum Schreiben, Zeichnen, Malen oder Ähnlichem
US20060222443A1 (en) * 2005-04-04 2006-10-05 Eileen Savage Marker implement
CN2889735Y (zh) 2006-03-30 2007-04-18 李宪祎 无木石墨绘画笔
EP2053105A1 (de) * 2006-07-12 2009-04-29 Sakura Color Products Corporation Verfahren zur herstellung einer schwarzen wachskreide
JP2008189873A (ja) 2007-02-07 2008-08-21 Tombow Pencil Co Ltd 手が汚れない鉛筆またはシャープペンシル用芯

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3098145A1 (fr) 2019-07-01 2021-01-08 Maped Instrument d’ecriture

Also Published As

Publication number Publication date
ITVI20120305A1 (it) 2014-05-13
EP2730428B1 (de) 2016-03-16
ES2574423T3 (es) 2016-06-17
EP2730428B8 (de) 2016-07-13

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