EP0138342B1 - Verfahren zum Appretieren von Farbentwicklungspapier - Google Patents

Verfahren zum Appretieren von Farbentwicklungspapier Download PDF

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Publication number
EP0138342B1
EP0138342B1 EP19840305860 EP84305860A EP0138342B1 EP 0138342 B1 EP0138342 B1 EP 0138342B1 EP 19840305860 EP19840305860 EP 19840305860 EP 84305860 A EP84305860 A EP 84305860A EP 0138342 B1 EP0138342 B1 EP 0138342B1
Authority
EP
European Patent Office
Prior art keywords
paper
rolls
colour
colour developer
calendering
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
Application number
EP19840305860
Other languages
English (en)
French (fr)
Other versions
EP0138342B2 (de
EP0138342A2 (de
EP0138342A3 (en
Inventor
Brian Edward Evans
Wendie Marianne Elliott
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.)
Wiggins Teape Group Ltd
Original Assignee
Wiggins Teape Group Ltd
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
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Application filed by Wiggins Teape Group Ltd filed Critical Wiggins Teape Group Ltd
Publication of EP0138342A2 publication Critical patent/EP0138342A2/de
Publication of EP0138342A3 publication Critical patent/EP0138342A3/en
Application granted granted Critical
Publication of EP0138342B1 publication Critical patent/EP0138342B1/de
Publication of EP0138342B2 publication Critical patent/EP0138342B2/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B41M5/132—Chemical colour-forming components; Additives or binders therefor
    • B41M5/155—Colour-developing components, e.g. acidic compounds; Additives or binders therefor; Layers containing such colour-developing components, additives or binders
    • B41M5/1555—Inorganic mineral developers, e.g. clays

Definitions

  • the present invention relates to a process for finishing colour developer paper of the type which is used in pressure-sensitive copying systems and particularly copying systems of the transfer type.
  • an upper sheet (hereinafter referred to as a CB sheet) is coated on its lower surface with microcapsules containing an oily solution of at least one colourless colour former and a lower sheet (hereinafter referred to as a CF sheet) is coated on its upper surface with a colour developing co-reactant such as an acidic clay, a phenolic resin or certain organic acid salts.
  • a colour developing co-reactant such as an acidic clay, a phenolic resin or certain organic acid salts.
  • one or more intermediate sheets (hereinafter referred to as CFB sheets) are provided each of which is coated on its lower surface with microcapsules and on its upper surface with colour developing co-reactant material. Pressure exerted on the sheets by writing or typing ruptures the microcapsules thereby releasing colour former solution on to the colour developing co-reactant material and giving rise to a chemical reaction which develops the colour former and so produces an image.
  • colour developer paper should be smooth and of a certain stiffness and bulk to provide the desired handleability.
  • colour developer paper is cold calendered (although the calender rolls may become warm when a hot paper web passes between them as may happen for example when the web passes straight from the drying section).
  • calender rolls may become warm when a hot paper web passes between them as may happen for example when the web passes straight from the drying section.
  • an acceptable smoothness is often only obtained at the expense of stiffness and bulk.
  • a process for finishing colour developer paper for use in a pressure sensitive copying system comprising the step of passing a paper web carrying a coating of inorganic colour developing co-reactant material through a nip between two calendering rolls, characterized in that the calendering rolls are both heated to a temperature above that of the web.
  • the present invention provides colour developer paper which has been finished according to said first aspect.
  • the present invention provides a pressure sensitive copying system utilizing colour developer paper finished according to said first aspect.
  • the calendering rolls are at a temperature of at least 50°C, more preferably at least 80°C and even more preferably at least 110°C. Heating may be achieved by means of, for example, any one of the following media high pressure steam, pressurised water or oil.
  • the heating media may pass through either a central reservoir in the calendering roll or round an annular space within the roll (this type of roll is known as a displacer roll and provides a more even temperature across the roll).
  • suitable calendering rolls may be any of those conventionally used in the paper industry for example chilled iron rolls.
  • the present process is suited for use with papers in which the colour developing co-reactant material is an acidic clay or other inorganic material.
  • the colour developing co-reactant material is an acid washed dioctahedral montmorillonite clay such as that sold by Mizusawa Industrial Chemicals of Japan under the trade mark "Silton” or that sold by Sud-Chemie A.G. of West Germany under the trade mark "Copisil”.
  • the colour developer coating may incorporate a filler such as kaolin or calcium carbonate.
  • a binder such as latex may also be included in the coating.
  • the present invention also affords the benefit of considerable cost savings in so much as an increased amount of filler may be added to the base paper, thus reducing the amount of expensive fibre needed without affecting the stiffness and bulk of the resulting colour developer sheet for a given smoothness.
  • a paper web generally indicated 1 carrying a coating of colour developer material on its surface 3 is unwound from a reel 4 in the direction shown by the arrow and then passes around guide rolls 2.
  • the web then passes between two calender rolls 6.
  • the calender rolls 6 are of chilled iron and are supplied with high pressure steam such that their surface is at a temperature of the order of 105°C.
  • the rolls 6 form a pressure nip 9 at their point of contact.
  • the nip 9 is protected by a nip guard 8.
  • the web 1 then passes around two further guide rolls 2 before being wound up into a roll 5.
  • the paper web may alternatively pass straight from a coating section at which it has just been coated and dried to the calender rolls.
  • a web of clay coated colour developer paper ("Idem" CF 57 supplied by Wiggins Teape) was passed through a hot calendering nip as shown in the drawing with the coated side down.
  • the surfaces of the calendering rolls were maintained at a temperature of 105°C.
  • the nip pressure was varied as was the speed at which the web passed through the hot calendering nip.
  • a control was also run by passing a similar web through a cold calendering nip, the surfaces of the calendering rolls being at a temperature of 18°C.
  • the bulk and stiffness of the paper were then measured to give an indication of the handleability of the resulting paper. Bendtsen and Parker roughness were also measured to indicate the degree of smoothness of the colour developer coating.
  • the stiffness was measured in Taber units using the method according to International Standard (IS) No. 2493 in both the machine direction (MD) and the cross section (CD) of the web.
  • the bulk was measured according to British Standard BS3983.
  • the Bendtsen roughness was measured according to British Standard BS4420:1969 for both the colour developer coated side of the paper web and also the uncoated side.
  • Parker roughness may be measured under a variety of conditions.
  • the Parker roughness in this case was measured with a standard soft backing (Neoprene Litho blanket 85° Shore) at a clamping pressure of 20 kgfcm- 2 . This is indicated as S-20 in the tables of results.
  • the calender intensity (CI) test involved superimposing strips of paper coated with encapsulated colour former solution onto a strip of the coated paper under test, passing the superimposed strips through a laboratory calender to rupture the capsules and thereby produce a colour on the test strip, measuring the reflectance of the thus coloured strip (I) and expressing the result ( 1 / 10 ) as a percentage of an unused control strip (1 0 ) ' Thus the lower the calender intensity value ( 1 / 10 ) the more intense the developed colour.
  • the CI values were recorded after 2 minutes and again after 48 hours.
  • Hot calendering does not appear to have any significant effects on the functional properties of the CF as evidenced by the CI values obtained.
  • the CI values obtained for hot calendered paper are not substantially different from those obtained for cold calendered paper.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Color Printing (AREA)
  • Paper (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Claims (7)

1. Verfahren zum Appretieren von Farbentwicklungspapier zur Verwendung in einem druckempfindlichen Kopiersystem, umfassend den Schritt des Durchführens einer Papierbahn, die eine Beschichtung eines anorganischen Farbentwicklungs-Coreaktantenmaterials trägt, durch einen Walzenspalt zwischen zwei Kalandrierungsrollen, dadurch gekennzeichnet, daß beide Kalandrierungsrollen auf eine höhere Temperatur als die der Papierbahn aufgeheizt werden.
2. Verfahren nach Anspruch 1, worin die Rollen eine Temperatur von über 50°C aufweisen.
3. Verfahren nach Anspruch 2, worin die Rollen eine Temperatur von mindestens 80°C aufweisen.
4. Verfahren nach Anspruch 3, worin die Rollen eine Temperatur von mindestens 110°C aufweisen.
5. Verfahren nach Anspruch 1 oder 2, worin das Farbentwicklungs-Coreaktantenmaterial ein saurer Ton ist.
6. Verfahren nach einem der vorhergehenden Ansprüche, worin das Farbentwicklungs-Coreaktantenmaterial ein mit Säure gewaschener dioktaedrischer Montmorillonit-Ton ist.
7. Druckempfindliches Kopiersystem unter Verwendung von Farbentwicklungspapiers, das nach dem Verfahren nach Anspruch 1 appretiert wurde.
EP19840305860 1983-09-07 1984-08-28 Verfahren zum Appretieren von Farbentwicklungspapier Expired EP0138342B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8323970 1983-09-07
GB838323970A GB8323970D0 (en) 1983-09-07 1983-09-07 Finishing colour developer paper

Publications (4)

Publication Number Publication Date
EP0138342A2 EP0138342A2 (de) 1985-04-24
EP0138342A3 EP0138342A3 (en) 1985-12-18
EP0138342B1 true EP0138342B1 (de) 1988-05-11
EP0138342B2 EP0138342B2 (de) 1991-04-17

Family

ID=10548431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840305860 Expired EP0138342B2 (de) 1983-09-07 1984-08-28 Verfahren zum Appretieren von Farbentwicklungspapier

Country Status (7)

Country Link
EP (1) EP0138342B2 (de)
JP (1) JPS6078779A (de)
CA (1) CA1238782A (de)
DE (1) DE3471047D1 (de)
ES (1) ES535713A0 (de)
FI (1) FI77183C (de)
GB (1) GB8323970D0 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330691A (en) * 1963-09-16 1967-07-11 Mead Corp Process of coating paper with attapulgite clay
US3632378A (en) * 1969-01-31 1972-01-04 Appleton Paper Inc Method and apparatus for manufacture of dual coated sheet with pressure rupturable materials
US4047738A (en) * 1976-01-12 1977-09-13 Engelhard Minerals & Chemicals Corporation Record sheets sensitized with reduced charge montmorillonite pigment
JPS52138219A (en) * 1976-05-14 1977-11-18 Fuji Photo Film Co Ltd Record sheets
JPS5835879B2 (ja) * 1980-10-06 1983-08-05 神崎製紙株式会社 感圧複写紙の製造装置
JPS5817168U (ja) * 1981-07-25 1983-02-02 ソニー株式会社 リボン

Also Published As

Publication number Publication date
JPS6078779A (ja) 1985-05-04
JPH0441662B2 (de) 1992-07-09
FI843472A (fi) 1985-03-08
FI77183B (fi) 1988-10-31
FI843472A0 (fi) 1984-09-05
EP0138342B2 (de) 1991-04-17
EP0138342A2 (de) 1985-04-24
ES8601361A1 (es) 1985-10-16
GB8323970D0 (en) 1983-10-12
DE3471047D1 (en) 1988-06-16
EP0138342A3 (en) 1985-12-18
ES535713A0 (es) 1985-10-16
CA1238782A (en) 1988-07-05
FI77183C (fi) 1989-02-10

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