CA1238782A - Process for finishing colour developer paper - Google Patents
Process for finishing colour developer paperInfo
- Publication number
- CA1238782A CA1238782A CA000462085A CA462085A CA1238782A CA 1238782 A CA1238782 A CA 1238782A CA 000462085 A CA000462085 A CA 000462085A CA 462085 A CA462085 A CA 462085A CA 1238782 A CA1238782 A CA 1238782A
- Authority
- CA
- Canada
- 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
Links
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
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)
Abstract
ABSTRACT
A PROCESS FOR FINISHING COLOUR DEVELOPER PAPER
A colour developer paper carrying a coating of acid clay colour developing material is finished by passage through a nip between two calendering rolls. Both the calendering rolls are heated to temperatures of at least 50°C and preferably at least 80°C.
The process provides a paper of improved smoothness and handleability for use in a pressure sensitive copying system.
A PROCESS FOR FINISHING COLOUR DEVELOPER PAPER
A colour developer paper carrying a coating of acid clay colour developing material is finished by passage through a nip between two calendering rolls. Both the calendering rolls are heated to temperatures of at least 50°C and preferably at least 80°C.
The process provides a paper of improved smoothness and handleability for use in a pressure sensitive copying system.
Description
~23~782 PROCESS FOR FINISHING CO]LOUR DEVELOPER PAPER
The present invention relates to a process for finishing colour developer paper of the t'ype ~hich is used in pressure-sensitive copying systems and particularly copying systems o~ the trans~er type.
In such a trans~er system an upper sheet (hereina~ter referred to as a CB sheet) is coated on its lower surface with microcapsules containing an oily solution o~ at least one colourless colour ~ormer and a lower sheet (hereina~ter referred to as a CF sheet) is coated on its 10 upper surface with a colour developing co-reactant such as an acidic clay, a phenolic resin or certain organic acid salts. If ~ore than one copy is required, one or more intermediate sheets (hereinafter referred to as CFB
sheets) are provided each of ~hich is coated on its lower 15 surface with microcapsules and on its upper surface with colour developing co-reactant material. Pressure e~erted on the sheets by ~riting or typing ruptures the microcapsules thereby releasing colour former solution on to the colour developing co-reactant material and gi~ing 20 rise to a chemical reaction which develops the colour former and so produces an image.
One of the main uses~o~ pressure sensitive copyin~
systems is in business forms~. It is important that the coated paper which is to be used for the business ~orms 25 should be easily printable and should be of good handleability for~eàse o~ ~eeding into a printing machine.
, . .` ' ` , ` ' , : . :, , - : , . . .
:. . , : : . .
~Z:38782 In partlcular colour developer paper should be smoooth and of a certain sti~ness and bulk to provide the desired handleability.
Generally, in order to obtain the required smoothness, 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 ~rom the drying section). Howe~er an acceptable smoothness is often only obtained at the e~pense o~
10 stif$ness and bulk.
It is an object o~ the present invention to produce colour developer paper which is of e~cellent smoothness but is also o~ good handleability.
According to a first aspect of the present invention 15 there is provided a process for finishing colour developer paper for use in a pressure sensitive copying system, comprising the step of passing a paper ~eb carrying a coating of inorganic colour developing co-reactant material through a nip between two calendering rolls, 20 characterized in that the calendering rolls are both heated to a temperature above that of the web.
In a second aspect the present invention provides colour developer paper which has been finished according to said first aspect.
25 In a third aspect the present invention provides a pressure sensitive copying system utilizing colour developer paper finished accordi~g to said ~irst aspect.
Preferably the calendering rolls are at a temperature o~
.
... .
- - . . . .
- :
1Z3~7~3Z
at least 50C, more pre~erably at least 80C and even more pre~erably at least 110C. Heating may be achieved by means o~, for example, any one of the ~ollowing 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 ~ype of roll is known as a displacer roll and provides a more even temperature across the roll).
In general suitable calendering rolls may be any o~ those 10 conventionally used in the paper industry ~or e~ample chilled iron rolls.
The present process is particularly suited ~or use with papers in which the colour developing co-reactant material is an acidic clay or other inorganic material, but in 15 principle, it could alternatively be a phenolic resin or certain organic acid salts, both of ~hich alternative co-reactant materials are well known in the pressure sensitive copying art and so will not be described ~urther herein.
~0 Pre~erably the colour developing co~reactant material is an acid washed dioctahedral montmorillonite clay such as that sold by ~izusawa Industrial Chemicals o~ Japan under the trade mark "Sil~on" or that sold by Sud-Chemie A.G. o~
West Germany under tbe trade mark "Copisil".
25 Additionally the colour developer coating may incorporate a filler such as kaolin or calcium carbonate. A binder such as la*e~ may also be included in the coating.
As well as a~ording improved smoothness without the corresponding deterioration in sti~ness and bulk usually 30 experienced, the present invention also af~ords the bene~it o~ considerable cost savings in so much as an increased amount o~ ~iller may be added to the base paper, . .
- . . . . ~ . ...................... . .
- : : ,.
387~2 thus reducing the amount of expensive fibre need~d ~ithout af~ecting the stiffness and bulk of ~he resulting colour developer sheet for a given smoothness.
In order that the present invention be more readily understood reference will now ble made to the accompanying drawing which illustrates diagr,ammatically and by way o~
example an embodiment thereoi, and which is a schematic side view of apparatus for flnilshing colour developer paper.
10 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 dlrection 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 15 chilled iron and are supplied with high pressure steam such that their surface is at a temperature of the order o~ 105C. The rolls 6 form a pressure nip 9 at their point of contact. The nip 9 is protected by a nip guard 8.
20 The web 1 then passes around two further guide rolls 2 before being wound up into a roll 5.
Instead of being unwound from a reel 4, the paper web may alternatively pass straight from a coating'section at which it has just been coated and dried to the calender 25 rolls.
The invention will now be illustrated by the Pollowing example.
Example A web of clay coated colour developer paper ("Idem" CF 57 . - . . . , - . - , : . , , ~ .: .
.' . ' ' ,~ . - ' ~ ' ': ~ ' , '' ''.-, , ~23~78~
supplied by Wiggins Teape) was passed through a hot calendering nip as shown in the drawing with the coated side down. The sur~aces of the calendering rolls were maintained at a temperature o~ 105C. 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 pass:Lng a similar web through a cold calendering nip, the surfaces of the calendering rolls being at a temperature O~e 18C.
10 The bulk and stl~fness oi' the paper were then measured to give an indication of the handleability o~ the resulting paper. Bendtsen and Parker roughness were also measured to indicate the degree of smoothness of the colour developer coating. The stiffness ~as measured in Taber 15 units using the method according to International Standard (IS) No. 2493 in both the machine direction (MD) and the cross direction (CD) of the web. The bulk was measured according to British Standard BS3983. The Bendtsen roughness was measured according to British Standard 20 BS4420:19~9 for both the colour developer coated side o~
the paper web and also the uncoated side.
The Parker roughness was measured in a similar manner to that described in the British Paper and Board Industry Federation (BPBIF) proposed procedure No. PP 59.
25 Parker roughness may be measured under a variety of conditions. The Parker roughness in this case was measured ~ith a standard so~t backing (Neoprene Litho blanket 85 Shore) at a clamping pressure of 20 kgfcm~20 Thls is indicated as S-20 in the tables 30 of results.
lZ3~7~32 For both Bendtsen and Parker roughness a high value indicates a rough surface therefore the lower the value the smoother the surface. All the results quoted are mean values of several readings. In order to illustrate that hot calendering does not impair the functional properties of the colour developer paper a calender intensity test was also carried out. The calender intensity (CI) test involved superimposing strips of paper coated with encapsulated colour former solution onto a 10 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 tes$ strip, measuring the reflectance of the thus coloured strip (I) and expressing the result (I/IO) as a 15 percentage of an unused control strip ( Io)~ Thus the lower the calender intensity value (I/IO) the more intense the developed colour. The CI values were recorded after 2 minutes and again after 48 hours.
The results are shown in Table 1, in which nip pressures 20 are quoted as linear pressures since it is di~ficult to quote an absolute value, as is well understood in the art.
-- - :. : :: , . . : , . . .~ . . .
~Z3~3'782 _______ ____ ___ ~ ~ ~ ~ O
~ ~ ___ ,~ c~ c~ ~ ~7 O
C~ ~, o l l l ~ ~ ,1 o ,, U~ U~ U~ U~ ~ ~
__ ^____ _ ~ __ ~ ~ 1-~ 1~ ~ c~ ~o ~ h ~ ~ --_ ~ ___ ___ C~
n~ ~ d~ OD ~il tt~ d~ O ~ 0 P~ ~ ~ ~ .~ _~ ~ _~ ~ O
_______ ____ ___ __ ___ h ,_~ _ ~ C- cq ~ 00 00 ~ ~ tD ~
I a~ e u~ 00 O ~ ~ ~ ~ ll ~ _~ _ U~ ~ 00 ~
~ 'Cl ~ ~ U:~ C` lS) ~ ~ oD .~
9~ ~ ~1 C~) ~i 0 O O N ~ O ~1 ____ ___ ~_ ___ O
~_ c) ~1 o ~1 n ~ ~ ~ ~ +~
~ I ~ _ _ _ C~ _ ~_ ~ C~
a~ co N 00 00 C~ CO X C' h ~3 g ~ C9 Il~ O It~ C~ C~o tC~
C) G~ O O -1 0 0 O `O O O O
_______ ___ ___ __ ___ ~ ~ .
~ C~ ~ O O 00 ~ ~ d1 ~ ~0 h ~ V N _l C~ N -1 N ~1 C~ C`i N E3 R h O O O O O O O O O O ll t~ ___ ___ , _ ___ 1~
~ E~ ~1 ~ ~ di ~ dl ~ ~ N ~ ~
_, o o o o o o o o o o E~ ____ ___ ___ ____ ' ~--___ ~D C~: ~ ~ u~ ~ O ~ C~
~ ~3 C~ -~ ~ ~ O ~1 0 -I ~ O
a~ o ~1 _1 ~ 1 i_l ~1 ~ .1 i:~
~ __ __ _ _ __ ___ .~1 .
~ ~ ~ r~ ~_ ~ ~
lQ ~ O O O O O O O O O O h ~ ~ 1~ t` U~ t` Il~
h ~ _~ ~ I N _~ ~. ~_ _ _ R, _ tg t- ~ 1 U~ tl~ OD U~
P~ ~ N C~ C~ ~N t--C~ C~ N N
~1 C~3 ~ ~ ~ C~ C`3 U~ C~ i~
~ ~1 -I ~1 ~ ;1( ~I C3 ~ P~ -___ _ ___ __ ___ ~ `-- O O O O H
R :--I u~ o~ 1~ oO
a: ~i N ~ io O
------h---------- --------------~ C) P
V : oO O ~
_______ __ ____ ,`
.-. , : ` - , - `~ ` . ' , ` , - . ` .
-. . , - - , .. : ,, :: ' .
-~23~82 The above procedure was then repeated but this time the colour developer web was hot calendered ~ith the coated side uppermost. Again a control was run at 18~C.
The results are shown in Table 2.
-- . : , .. . .
. . . ~ .::
.
, ~ , .. . - ~ ' .:
. ~
. , :
: '~ ', : . , . : '' ' .': , ~3~82 A ~ ~ _ _ _ _ _ _ _ . . W ~ V~
H --R--__ ~ _ ___ tO ~ ~) C`l 00 C~
C~ ~ ~ ~ I l l l dl ~ ~
__ ~ ___ _ ~ __ ~----___--U~--C~ O U~ ~ ~ 1 C~
t~ t'7 C`l C`i C~ C
~ ~_------_ ~ t~) N O ~i 0 0 ~ N 0 _______--_~_ ~--~ ~ ~__ C`l ~ dl t` O ~ C~ N C`l CD
~ ~ ~ _ _ _ _ _ ~_ _ N It~ ~ C~l 1~ C`- N t~ c~ N
O ~ l ~1 ~ 1~ c~ 7 N tlD co ~1 c~ ~1 o c~ ,i o o o o ~ r~l O
~ _l____ ___ ~ 0~ 0 0 ~
a) _ d~ N N ~ C~ c~a -1 r I r I _ _~ _ a:l I 1~ c~ 1~ o o ~ ~ c~
~ ~ C~ O~ ~ ~1 ~
1~ O O O O O o o o o o o o _______ ____ ___ ___ ___ ~q h ~ ,) ~1 ~1 -~ ~ C` c5 ~ i~ ~ tD N ~1 ~1 ~2 h O O O O O O O O O O O O
E~ ,Q ------ . . . . . . N O O d1 t~l ~
_, O O O O O O O O O O O O
el~ ___~ __ _ _ __ ___ _ _ ~4 ~D ~ ~CS~ C~ tD r~l C~ ~ ~1 ~) ~ N ..
~ 3 j_l o ~ -1 0 C:~ O ~ C~ .-1 0 0 .' C~ ~1 ~1 0 ~ 1 _~ O O ~ 1 ~ ---------- -- ------------ ,' H O O O O O O O O O oO O O
_~ ~ r~ .~ ~
h _ ~ ~ C~ ~ ~ ~ ~
R 1~ U~ O 1~ It~ O IC~ It~ O It~ It~ O U) . ~ ~10 N C-- 10 N ~ If~ N C~
0~ O
_ _____ ____ ______ .
.
.
, ' ~ ~ ' ' ' :. , ~ , -- 10 -- :
It will be seen from the results that the general e~ect of hot calendering was to reduce the bulk and increase the smoothness for a given line pressure. Stif~ness also increased ~or a given smoothness.
Hot calendering does not appear to have any significant effects on the functional properties o~ the CF as evidenced by the CI values obtained. The CI values obtained for hot calendered paper are not substantially different from those obtained ~or cold calendered paper.
10 Although it appears from the results that the absolute values obtained when calendering at 105C as compared to 120C are different, the proportional benefits o~ hot calendering are the same in each case. These differences are likely to be due to variations in web moisture content 15 before calendering or slight basis weig&t variations.
.
.
: , -.
: . ,, : . . , . ~ .
,: - ~,: ~: .
: ~ , . - . . . : : . : , . :
- . . ., . :
.. . . . . .
: ~: . . :
The present invention relates to a process for finishing colour developer paper of the t'ype ~hich is used in pressure-sensitive copying systems and particularly copying systems o~ the trans~er type.
In such a trans~er system an upper sheet (hereina~ter referred to as a CB sheet) is coated on its lower surface with microcapsules containing an oily solution o~ at least one colourless colour ~ormer and a lower sheet (hereina~ter referred to as a CF sheet) is coated on its 10 upper surface with a colour developing co-reactant such as an acidic clay, a phenolic resin or certain organic acid salts. If ~ore than one copy is required, one or more intermediate sheets (hereinafter referred to as CFB
sheets) are provided each of ~hich is coated on its lower 15 surface with microcapsules and on its upper surface with colour developing co-reactant material. Pressure e~erted on the sheets by ~riting or typing ruptures the microcapsules thereby releasing colour former solution on to the colour developing co-reactant material and gi~ing 20 rise to a chemical reaction which develops the colour former and so produces an image.
One of the main uses~o~ pressure sensitive copyin~
systems is in business forms~. It is important that the coated paper which is to be used for the business ~orms 25 should be easily printable and should be of good handleability for~eàse o~ ~eeding into a printing machine.
, . .` ' ` , ` ' , : . :, , - : , . . .
:. . , : : . .
~Z:38782 In partlcular colour developer paper should be smoooth and of a certain sti~ness and bulk to provide the desired handleability.
Generally, in order to obtain the required smoothness, 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 ~rom the drying section). Howe~er an acceptable smoothness is often only obtained at the e~pense o~
10 stif$ness and bulk.
It is an object o~ the present invention to produce colour developer paper which is of e~cellent smoothness but is also o~ good handleability.
According to a first aspect of the present invention 15 there is provided a process for finishing colour developer paper for use in a pressure sensitive copying system, comprising the step of passing a paper ~eb carrying a coating of inorganic colour developing co-reactant material through a nip between two calendering rolls, 20 characterized in that the calendering rolls are both heated to a temperature above that of the web.
In a second aspect the present invention provides colour developer paper which has been finished according to said first aspect.
25 In a third aspect the present invention provides a pressure sensitive copying system utilizing colour developer paper finished accordi~g to said ~irst aspect.
Preferably the calendering rolls are at a temperature o~
.
... .
- - . . . .
- :
1Z3~7~3Z
at least 50C, more pre~erably at least 80C and even more pre~erably at least 110C. Heating may be achieved by means o~, for example, any one of the ~ollowing 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 ~ype of roll is known as a displacer roll and provides a more even temperature across the roll).
In general suitable calendering rolls may be any o~ those 10 conventionally used in the paper industry ~or e~ample chilled iron rolls.
The present process is particularly suited ~or use with papers in which the colour developing co-reactant material is an acidic clay or other inorganic material, but in 15 principle, it could alternatively be a phenolic resin or certain organic acid salts, both of ~hich alternative co-reactant materials are well known in the pressure sensitive copying art and so will not be described ~urther herein.
~0 Pre~erably the colour developing co~reactant material is an acid washed dioctahedral montmorillonite clay such as that sold by ~izusawa Industrial Chemicals o~ Japan under the trade mark "Sil~on" or that sold by Sud-Chemie A.G. o~
West Germany under tbe trade mark "Copisil".
25 Additionally the colour developer coating may incorporate a filler such as kaolin or calcium carbonate. A binder such as la*e~ may also be included in the coating.
As well as a~ording improved smoothness without the corresponding deterioration in sti~ness and bulk usually 30 experienced, the present invention also af~ords the bene~it o~ considerable cost savings in so much as an increased amount o~ ~iller may be added to the base paper, . .
- . . . . ~ . ...................... . .
- : : ,.
387~2 thus reducing the amount of expensive fibre need~d ~ithout af~ecting the stiffness and bulk of ~he resulting colour developer sheet for a given smoothness.
In order that the present invention be more readily understood reference will now ble made to the accompanying drawing which illustrates diagr,ammatically and by way o~
example an embodiment thereoi, and which is a schematic side view of apparatus for flnilshing colour developer paper.
10 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 dlrection 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 15 chilled iron and are supplied with high pressure steam such that their surface is at a temperature of the order o~ 105C. The rolls 6 form a pressure nip 9 at their point of contact. The nip 9 is protected by a nip guard 8.
20 The web 1 then passes around two further guide rolls 2 before being wound up into a roll 5.
Instead of being unwound from a reel 4, the paper web may alternatively pass straight from a coating'section at which it has just been coated and dried to the calender 25 rolls.
The invention will now be illustrated by the Pollowing example.
Example A web of clay coated colour developer paper ("Idem" CF 57 . - . . . , - . - , : . , , ~ .: .
.' . ' ' ,~ . - ' ~ ' ': ~ ' , '' ''.-, , ~23~78~
supplied by Wiggins Teape) was passed through a hot calendering nip as shown in the drawing with the coated side down. The sur~aces of the calendering rolls were maintained at a temperature o~ 105C. 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 pass:Lng a similar web through a cold calendering nip, the surfaces of the calendering rolls being at a temperature O~e 18C.
10 The bulk and stl~fness oi' the paper were then measured to give an indication of the handleability o~ the resulting paper. Bendtsen and Parker roughness were also measured to indicate the degree of smoothness of the colour developer coating. The stiffness ~as measured in Taber 15 units using the method according to International Standard (IS) No. 2493 in both the machine direction (MD) and the cross direction (CD) of the web. The bulk was measured according to British Standard BS3983. The Bendtsen roughness was measured according to British Standard 20 BS4420:19~9 for both the colour developer coated side o~
the paper web and also the uncoated side.
The Parker roughness was measured in a similar manner to that described in the British Paper and Board Industry Federation (BPBIF) proposed procedure No. PP 59.
25 Parker roughness may be measured under a variety of conditions. The Parker roughness in this case was measured ~ith a standard so~t backing (Neoprene Litho blanket 85 Shore) at a clamping pressure of 20 kgfcm~20 Thls is indicated as S-20 in the tables 30 of results.
lZ3~7~32 For both Bendtsen and Parker roughness a high value indicates a rough surface therefore the lower the value the smoother the surface. All the results quoted are mean values of several readings. In order to illustrate that hot calendering does not impair the functional properties of the colour developer paper a calender intensity test was also carried out. The calender intensity (CI) test involved superimposing strips of paper coated with encapsulated colour former solution onto a 10 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 tes$ strip, measuring the reflectance of the thus coloured strip (I) and expressing the result (I/IO) as a 15 percentage of an unused control strip ( Io)~ Thus the lower the calender intensity value (I/IO) the more intense the developed colour. The CI values were recorded after 2 minutes and again after 48 hours.
The results are shown in Table 1, in which nip pressures 20 are quoted as linear pressures since it is di~ficult to quote an absolute value, as is well understood in the art.
-- - :. : :: , . . : , . . .~ . . .
~Z3~3'782 _______ ____ ___ ~ ~ ~ ~ O
~ ~ ___ ,~ c~ c~ ~ ~7 O
C~ ~, o l l l ~ ~ ,1 o ,, U~ U~ U~ U~ ~ ~
__ ^____ _ ~ __ ~ ~ 1-~ 1~ ~ c~ ~o ~ h ~ ~ --_ ~ ___ ___ C~
n~ ~ d~ OD ~il tt~ d~ O ~ 0 P~ ~ ~ ~ .~ _~ ~ _~ ~ O
_______ ____ ___ __ ___ h ,_~ _ ~ C- cq ~ 00 00 ~ ~ tD ~
I a~ e u~ 00 O ~ ~ ~ ~ ll ~ _~ _ U~ ~ 00 ~
~ 'Cl ~ ~ U:~ C` lS) ~ ~ oD .~
9~ ~ ~1 C~) ~i 0 O O N ~ O ~1 ____ ___ ~_ ___ O
~_ c) ~1 o ~1 n ~ ~ ~ ~ +~
~ I ~ _ _ _ C~ _ ~_ ~ C~
a~ co N 00 00 C~ CO X C' h ~3 g ~ C9 Il~ O It~ C~ C~o tC~
C) G~ O O -1 0 0 O `O O O O
_______ ___ ___ __ ___ ~ ~ .
~ C~ ~ O O 00 ~ ~ d1 ~ ~0 h ~ V N _l C~ N -1 N ~1 C~ C`i N E3 R h O O O O O O O O O O ll t~ ___ ___ , _ ___ 1~
~ E~ ~1 ~ ~ di ~ dl ~ ~ N ~ ~
_, o o o o o o o o o o E~ ____ ___ ___ ____ ' ~--___ ~D C~: ~ ~ u~ ~ O ~ C~
~ ~3 C~ -~ ~ ~ O ~1 0 -I ~ O
a~ o ~1 _1 ~ 1 i_l ~1 ~ .1 i:~
~ __ __ _ _ __ ___ .~1 .
~ ~ ~ r~ ~_ ~ ~
lQ ~ O O O O O O O O O O h ~ ~ 1~ t` U~ t` Il~
h ~ _~ ~ I N _~ ~. ~_ _ _ R, _ tg t- ~ 1 U~ tl~ OD U~
P~ ~ N C~ C~ ~N t--C~ C~ N N
~1 C~3 ~ ~ ~ C~ C`3 U~ C~ i~
~ ~1 -I ~1 ~ ;1( ~I C3 ~ P~ -___ _ ___ __ ___ ~ `-- O O O O H
R :--I u~ o~ 1~ oO
a: ~i N ~ io O
------h---------- --------------~ C) P
V : oO O ~
_______ __ ____ ,`
.-. , : ` - , - `~ ` . ' , ` , - . ` .
-. . , - - , .. : ,, :: ' .
-~23~82 The above procedure was then repeated but this time the colour developer web was hot calendered ~ith the coated side uppermost. Again a control was run at 18~C.
The results are shown in Table 2.
-- . : , .. . .
. . . ~ .::
.
, ~ , .. . - ~ ' .:
. ~
. , :
: '~ ', : . , . : '' ' .': , ~3~82 A ~ ~ _ _ _ _ _ _ _ . . W ~ V~
H --R--__ ~ _ ___ tO ~ ~) C`l 00 C~
C~ ~ ~ ~ I l l l dl ~ ~
__ ~ ___ _ ~ __ ~----___--U~--C~ O U~ ~ ~ 1 C~
t~ t'7 C`l C`i C~ C
~ ~_------_ ~ t~) N O ~i 0 0 ~ N 0 _______--_~_ ~--~ ~ ~__ C`l ~ dl t` O ~ C~ N C`l CD
~ ~ ~ _ _ _ _ _ ~_ _ N It~ ~ C~l 1~ C`- N t~ c~ N
O ~ l ~1 ~ 1~ c~ 7 N tlD co ~1 c~ ~1 o c~ ,i o o o o ~ r~l O
~ _l____ ___ ~ 0~ 0 0 ~
a) _ d~ N N ~ C~ c~a -1 r I r I _ _~ _ a:l I 1~ c~ 1~ o o ~ ~ c~
~ ~ C~ O~ ~ ~1 ~
1~ O O O O O o o o o o o o _______ ____ ___ ___ ___ ~q h ~ ,) ~1 ~1 -~ ~ C` c5 ~ i~ ~ tD N ~1 ~1 ~2 h O O O O O O O O O O O O
E~ ,Q ------ . . . . . . N O O d1 t~l ~
_, O O O O O O O O O O O O
el~ ___~ __ _ _ __ ___ _ _ ~4 ~D ~ ~CS~ C~ tD r~l C~ ~ ~1 ~) ~ N ..
~ 3 j_l o ~ -1 0 C:~ O ~ C~ .-1 0 0 .' C~ ~1 ~1 0 ~ 1 _~ O O ~ 1 ~ ---------- -- ------------ ,' H O O O O O O O O O oO O O
_~ ~ r~ .~ ~
h _ ~ ~ C~ ~ ~ ~ ~
R 1~ U~ O 1~ It~ O IC~ It~ O It~ It~ O U) . ~ ~10 N C-- 10 N ~ If~ N C~
0~ O
_ _____ ____ ______ .
.
.
, ' ~ ~ ' ' ' :. , ~ , -- 10 -- :
It will be seen from the results that the general e~ect of hot calendering was to reduce the bulk and increase the smoothness for a given line pressure. Stif~ness also increased ~or a given smoothness.
Hot calendering does not appear to have any significant effects on the functional properties o~ the CF as evidenced by the CI values obtained. The CI values obtained for hot calendered paper are not substantially different from those obtained ~or cold calendered paper.
10 Although it appears from the results that the absolute values obtained when calendering at 105C as compared to 120C are different, the proportional benefits o~ hot calendering are the same in each case. These differences are likely to be due to variations in web moisture content 15 before calendering or slight basis weig&t variations.
.
.
: , -.
: . ,, : . . , . ~ .
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Claims (6)
1. 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 characterised in that the calendering rolls are both heated to a temperature above that of the web.
2. A process as claimed in Claim 1 wherein the rolls are at a temperature above 50°C.
3. A process as claimed in Claim 2 wherein the rolls are at a temperature of at least 80°C.
4. A process as claimed in Claim 3 wherein the rolls are at a temperature of at least 110°C.
5. A process as claimed in Claim 1 or 2 wherein the colour developing co-reactant material is an acidic clay.
6. A process as claimed in any one of claims 1 to 3 wherein the colour developing co-reactant material is an acid washed dioctahedral montmorillonite clay.
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 (1)
| Publication Number | Publication Date |
|---|---|
| CA1238782A true CA1238782A (en) | 1988-07-05 |
Family
ID=10548431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000462085A Expired CA1238782A (en) | 1983-09-07 | 1984-08-29 | Process for finishing colour developer paper |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0138342B2 (en) |
| JP (1) | JPS6078779A (en) |
| CA (1) | CA1238782A (en) |
| DE (1) | DE3471047D1 (en) |
| ES (1) | ES535713A0 (en) |
| FI (1) | FI77183C (en) |
| GB (1) | GB8323970D0 (en) |
Family Cites Families (6)
| 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 (en) * | 1980-10-06 | 1983-08-05 | 神崎製紙株式会社 | Pressure-sensitive copying paper manufacturing equipment |
| JPS5817168U (en) * | 1981-07-25 | 1983-02-02 | ソニー株式会社 | ribbon |
-
1983
- 1983-09-07 GB GB838323970A patent/GB8323970D0/en active Pending
-
1984
- 1984-08-28 DE DE8484305860T patent/DE3471047D1/en not_active Expired
- 1984-08-28 EP EP19840305860 patent/EP0138342B2/en not_active Expired
- 1984-08-29 CA CA000462085A patent/CA1238782A/en not_active Expired
- 1984-09-05 FI FI843472A patent/FI77183C/en not_active IP Right Cessation
- 1984-09-06 ES ES535713A patent/ES535713A0/en active Granted
- 1984-09-07 JP JP59187852A patent/JPS6078779A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6078779A (en) | 1985-05-04 |
| JPH0441662B2 (en) | 1992-07-09 |
| FI843472A (en) | 1985-03-08 |
| FI77183B (en) | 1988-10-31 |
| FI843472A0 (en) | 1984-09-05 |
| EP0138342B2 (en) | 1991-04-17 |
| EP0138342A2 (en) | 1985-04-24 |
| ES8601361A1 (en) | 1985-10-16 |
| GB8323970D0 (en) | 1983-10-12 |
| DE3471047D1 (en) | 1988-06-16 |
| EP0138342A3 (en) | 1985-12-18 |
| ES535713A0 (en) | 1985-10-16 |
| FI77183C (en) | 1989-02-10 |
| EP0138342B1 (en) | 1988-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |