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WO1993010485A1 - Procede et solvants pour le fixage d'un toner a base de polystyrene sur un support de reproduction d'un appareil d'impression ou de copie - Google Patents

Procede et solvants pour le fixage d'un toner a base de polystyrene sur un support de reproduction d'un appareil d'impression ou de copie Download PDF

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Publication number
WO1993010485A1
WO1993010485A1 PCT/EP1992/002267 EP9202267W WO9310485A1 WO 1993010485 A1 WO1993010485 A1 WO 1993010485A1 EP 9202267 W EP9202267 W EP 9202267W WO 9310485 A1 WO9310485 A1 WO 9310485A1
Authority
WO
WIPO (PCT)
Prior art keywords
solvent
fixing
toner
polystyrene
printing
Prior art date
Application number
PCT/EP1992/002267
Other languages
German (de)
English (en)
Inventor
Gerd Goldmann
Original Assignee
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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 Siemens Nixdorf Informationssysteme Aktiengesellschaft filed Critical Siemens Nixdorf Informationssysteme Aktiengesellschaft
Priority to EP92919887A priority Critical patent/EP0613572B1/fr
Priority to DE59202470T priority patent/DE59202470D1/de
Publication of WO1993010485A1 publication Critical patent/WO1993010485A1/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G11/00—Selection of substances for use as fixing agents

Definitions

  • the invention relates to a method and a solvent for fixing a polystyrene-based toner on a recording medium of a printing or copying machine, the solvent being evaporated in a fixing device and acting on the toner in this state.
  • the toner is dissolved in the vapor of a suitable solvent and intimate contact is achieved between the toner and the recording medium.
  • An azeotropic mixture of trichlorotrifluoroethane (C 2 C1, F,) and acetone (C, HgO) is used as the solvent.
  • the primary solvent here is acetone, while trichlorotrifluoroethane serves as a flame retardant.
  • Trichlorotrifluoroethane (CFC R133) has a high ozone potential of 80% and a high greenhouse effect of 135%, which leads to environmental pollution if released.
  • the object of the invention is therefore to provide a method for fixing a polystyrene-based toner to a recording medium of a printing or copying machine, which causes minimal environmental pollution with regard to ozone depletion potential and greenhouse effect and, on the other hand, also a constant, constant fixing quality differently constructed recording media guaranteed.
  • Substances with the empirical formula C 2 HF. j Cl 2 are referred to as partially halogenated chlorofluorocarbons or hydrofluoroalkals. They are particularly environmentally friendly. From these compounds of the partially halogenated chlorofluorocarbons, the use of partially chlorinated fluorocarbons R123 and R141b has proven to be particularly favorable. Compared to toners with a non-crosslinked polymer matrix, the polymer matrix of which consists of polystyrene and metaacrylates, the partially chlorinated fluorocarbon HFCKW R123 has such a high dissolving effect that the R123 can be used as the sole fixing agent (without the addition of acetone).
  • R123 as a fixing agent has the advantage, in addition to the low environmental impact, that it can be used in its pure form, so that a proportion of the mixture, like the known fixing agents, cannot become leaner during pressing. Since the fixing agent according to the invention consists of pure R123, underfixing can no longer occur. For this reason, different types of paper can be used as recording media. Furthermore, the fixative has a low dependence on air humidity In contrast to acetone, which is readily water-soluble, which is why regulation of the air humidity in the fixing device can be dispensed with, or the air moisture absorbed by the recording medium in the most varied amounts does not have a negative effect on the fixing process.
  • the use of the fixing agent according to the invention enables a larger fixing window with regard to under- and over-fixing, ie a constant, constant fixing quality in the most varied of operating conditions without additional high control effort.
  • FIG. 1 shows a basic illustration of an electrophotographic printing device.
  • the heart of this device is a FT photoconductor drum.
  • a photoelectric layer is arranged on the surface of this photoconductor drum FT. This is initially evenly charged with the help of a corotron KO.
  • the surface of the drum is partially illuminated. This can be done with the aid of a character generator, which can consist of a laser LA, a deflection cell AB and a polygon mirror PO.
  • a character generator which has an arrangement of light-emitting diodes as the character-generating elements.
  • the light emanating from the laser LA is split into partial beams in the deflection cell AB, for example an acousto-optical deflection cell, according to the characters to be printed, which are directed by the polygon mirror PO onto the surface of the photoconductor drum FT.
  • the surface of the drum is partially discharged in accordance with the partial beams directed onto the photoconductor drum. If the electrophotographic printing device shown is used as a copying device, the image to be copied is imaged in a known manner on the photoconductor drum FT via appropriate optics.
  • the charge images generated by the character generator or the imaging optics for a copy on the surface of the photoconductor drum FT are developed in a developer station ES, i.e. they are colored with a developer mixture.
  • the developer station ES is constructed in a known manner, it can e.g. Magnetic brushes included.
  • the charge images which have developed toner images on the photoconductor drum FT then reach a transfer printing station US.
  • a corotron KOI is in turn arranged there. Due to the existing in the transfer station US electrostatic field, the toner images on a recording medium AT z. B. a paper web or single sheets pulled over. The toner images stick to the surface of the AT recording medium.
  • the record carrier AT can be removed from a stack ST1 and fed to the transfer station US via feed beads VR.
  • a roller RL is arranged behind the transfer station US, through which the recording medium is deflected and guided to a fixing device FR.
  • the fixing device FR can consist of a housing GH through which the record carrier AT is passed.
  • a solvent LM is formed, for example from one of the molecular formula C 2 HF, C1 2 designated connections, which generates the necessary steam for fixation.
  • Such compounds are referred to as partially halogenated chlorofluorocarbons, which have the advantages described above.
  • the partially chlorinated fluorocarbon HFCKW R123 has been found to be particularly advantageous.
  • the solvent vapor produced in this way acts on the recording medium AT, in particular on the toner applied to the recording medium. It dissolves the toner particles so that they adhere permanently to the recording medium.
  • a toner based on polystyrene is used as the toner. It has turned out to be favorable to have a toner with a non-crosslinked polymer matrix, the polymer matrix of which consists of polystyrene and metaacrylates. Compared to toner with a non-crosslinked polymer matrix whose polymer matrix consists of polystyrene and metaacrylates, the partially chlorinated fluorocarbon HFCKW R123 has such a high dissolving effect that the R123 can be used as the sole fixing agent, which has the advantages described above.
  • Solvents with the empirical formula C 2 HF, C1 2 are partially halogenated chlorofluorocarbons. These partially halogenated chlorofluorocarbons are generally suitable as solvents for fixing devices in electrophotographic printing devices. Since - as described - a fixing steam is generated from the solvent, for example by evaporation on a baffle plate or heating plate, it is advantageous if the solvent has a low boiling point, so that, for example, no negative heat influences are exerted on the toner and the paper and the evaporation energy to be supplied is not too high. A boiling point of less than 35 * has proven to be favorable.
  • Another partially halogenated fluorocarbon can also be used as the solvent, for example R141b with the formula CFC1 2 -CH 3 (1,1-dichloro-l-fluoroethane). It is known as a foaming agent for foamed plastics.
  • the concentration of the fixing agent in the fixing chamber FR may be advantageous to raise somewhat compared to the known fixing agent.
  • this can be achieved by mechanically shortening an ultrasonic measuring section serving as sensor S for the fixative concentration.
  • This mechanical shortening of the ultrasonic measuring section shortens the length base for the measurement, which results in an automatic increase in the fixing agent concentration while maintaining the other control variables of a known control arrangement RA for regulating the fixing agent concentration in the fixing device .
  • the known control arrangement RA controls a heating device HE which is connected to a voltage source SP and which is switched on and off with the aid of a switch SH.
  • cold traps with seals DI are arranged at the entry and exit points of the award carrier.
  • the recording medium AT arrives at further rollers RL1, RL2, via which the recording medium is transported to a recording stack ST2.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)

Abstract

Procédé de fixage d'un toner à base de polystyrène sur un support de reproduction (AT) d'un appareil d'impression ou de copie, selon lequel un solvant (LM) est vaporisé dans un dispositif de fixage (FR) et agit, dans cet état, sur le toner. On utilise comme solvants, des hydrocarbures fluorés partiellement halogénés, tels que le R183 et le R141b, qui ont la particularité de n'exercer qu'un faible effet nuisible sur l'environnement, et qui présentent vis-à-vis des toners à matrice polymère non réticulée avec matrice de base polymère en polystyrène et en métacrylates, un pouvoir dissolvant élevé.
PCT/EP1992/002267 1991-11-21 1992-09-30 Procede et solvants pour le fixage d'un toner a base de polystyrene sur un support de reproduction d'un appareil d'impression ou de copie WO1993010485A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP92919887A EP0613572B1 (fr) 1991-11-21 1992-09-30 Procede et solvants pour le fixage d'un toner a base de polystyrene sur un support de reproduction d'un appareil d'impression ou de copie
DE59202470T DE59202470D1 (de) 1991-11-21 1992-09-30 Verfahren und lösungsmittel zum fixieren eines auf polystyrolbasis aufgebauten toners auf einem aufzeichnungsträger eines druck- oder kopiergerätes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP91119850.5 1991-11-21
EP91119850 1991-11-21

Publications (1)

Publication Number Publication Date
WO1993010485A1 true WO1993010485A1 (fr) 1993-05-27

Family

ID=8207359

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002267 WO1993010485A1 (fr) 1991-11-21 1992-09-30 Procede et solvants pour le fixage d'un toner a base de polystyrene sur un support de reproduction d'un appareil d'impression ou de copie

Country Status (3)

Country Link
EP (1) EP0613572B1 (fr)
DE (1) DE59202470D1 (fr)
WO (1) WO1993010485A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0605128A1 (fr) * 1992-12-14 1994-07-06 Interscience Computer Corporation Un agent de fusion
EP0700988A2 (fr) 1994-07-15 1996-03-13 Solvay Fluor und Derivate GmbH Composition contenant difluorométhoxy-2,2,2-trifluoroéthane et utilisation
WO1997007432A1 (fr) * 1995-08-11 1997-02-27 Interscience Computer Corporation Procedes de fixation par vapeur de solvent et toners de couleur utilises dans ces procedes
EP0784238A1 (fr) 1996-01-15 1997-07-16 SOLVAY (Société Anonyme) Fixage d'un toner par des compositions d'hydrofluorocarbones gazeuses et ces compositions
DE19914514A1 (de) * 1999-03-30 2000-11-02 Oce Printing Systems Gmbh Einrichtung und Verfahren zum Drucken oder Kopieren, wobei das Tonerbild einem Lösungsmittel in Gasphase ausgesetzt wird

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10037464A1 (de) 2000-08-01 2002-03-07 Oce Printing Systems Gmbh Vorrichtung und Verfahren zum Fixieren eines Tonerbildes unter Verwendung eines gerichteten Stroms aus Lösemitteldampf

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2029325A (en) * 1978-08-11 1980-03-19 Siemens Ag Method of operating a non-mechanical printer or copier
EP0465037A1 (fr) * 1990-06-29 1992-01-08 Minnesota Mining And Manufacturing Company Composition de solvant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2029325A (en) * 1978-08-11 1980-03-19 Siemens Ag Method of operating a non-mechanical printer or copier
EP0465037A1 (fr) * 1990-06-29 1992-01-08 Minnesota Mining And Manufacturing Company Composition de solvant

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0605128A1 (fr) * 1992-12-14 1994-07-06 Interscience Computer Corporation Un agent de fusion
EP0700988A2 (fr) 1994-07-15 1996-03-13 Solvay Fluor und Derivate GmbH Composition contenant difluorométhoxy-2,2,2-trifluoroéthane et utilisation
US5674825A (en) * 1994-07-15 1997-10-07 Solvay Fluor Und Derivate Gmbh Difluoromethoxy-2,2,2-trifluoroethane compositions and methods of use
US5888688A (en) * 1994-07-15 1999-03-30 Solvay Fluor Und Derivate Gmbh Difluoromethoxy-2, 2, 2-trifluoroethane compositions and methods of use
WO1997007432A1 (fr) * 1995-08-11 1997-02-27 Interscience Computer Corporation Procedes de fixation par vapeur de solvent et toners de couleur utilises dans ces procedes
GB2318421A (en) * 1995-08-11 1998-04-22 Interscience Computer Corp Solvent vapor fixing methods and process color toners for use in same
EP0784238A1 (fr) 1996-01-15 1997-07-16 SOLVAY (Société Anonyme) Fixage d'un toner par des compositions d'hydrofluorocarbones gazeuses et ces compositions
BE1009964A3 (fr) * 1996-01-15 1997-11-04 Solvay Procede de fixage d'un toner dans un appareil d'impression ou de reproduction de documents et compositions utilisables dans ce procede.
US5714298A (en) * 1996-01-15 1998-02-03 Solvay (Societe Anonyme) Method for fixing a toner in a copier and compositions used in this method
DE19914514A1 (de) * 1999-03-30 2000-11-02 Oce Printing Systems Gmbh Einrichtung und Verfahren zum Drucken oder Kopieren, wobei das Tonerbild einem Lösungsmittel in Gasphase ausgesetzt wird
DE19914514B4 (de) * 1999-03-30 2007-10-18 OCé PRINTING SYSTEMS GMBH Einrichtung und Verfahren zum Drucken oder Kopieren, wobei das Tonerbild einem Lösungsmittel in Gasphase ausgesetzt wird

Also Published As

Publication number Publication date
DE59202470D1 (de) 1995-07-13
EP0613572A1 (fr) 1994-09-07
EP0613572B1 (fr) 1995-06-07

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