JP2003049391A - Ocr paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide OCR paper (paper for an optical character reader) having good ink-setting properties, capable of preventing printed images from blotting on the paper, so that the images are clear, and capable of giving water resistance to the images, when used in an ink-jet printing system mounted on a rotary press with a forms overlay function, etc., to say nothing of having satisfactory suitability as conventional OCR paper. SOLUTION: This OCR paper is given by suitably controlling an amount of an internal sizing agent added to the paper and a proportion of amounts of starch, a cationic resin, and a surface sizing agent added and applied to the surface of the paper, so that absorption of a water-soluble ink into the paper in an ink-jet printing process, blotting of printed characters on the paper, the water resistance and an optical density of the printed images on the paper are each controlled to be optimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source for a bar code or the like.
The present invention relates to an OCR sheet for reading information logically. Further
In detail, this invention is a water-soluble
With an ink jet printer using a volatile ink
Suitability and water after recording by inkjet recording method
Record of soluble ink bleeds due to rain, drinking water, etc.
OCR paper with water resistance
You. [0002] 2. Description of the Related Art Conventionally, OCR paper has been designed to respond to specific light.
To read records such as characters and figures
Defects that affect shooting characteristics (stains, wrinkles, pinholes)
No curl, moderate stiffness and coefficient of friction
Good transportability with printing machines and optical readers.
Furthermore, it has moderate smoothness, surface strength, and good dimensional stability.
Required good writing characteristics and suitability for offset printing
It has been. In recent years, as a recording method, an offset
An ink jet printer is connected to a form rotary press.
A tied system has been developed. This system smells
Inkjet printers used are generally water-soluble
Ink is ejected as fine droplets by various operating principles
To attach to recording paper such as paper to form dots and record.
High-speed, low-noise, easy to multi-color,
The feature is that the flexibility of the recording pattern is large. Generally, an ink jet using a water-soluble ink is used.
The recording quality of printing paper
Good absorption of water-soluble ink in the thickness direction
It is necessary that the absorption rate be high. this
Can prevent ink droplets from flowing from the recording surface after printing.
The phenomenon can be prevented, and after printing, the water-soluble ink
Spreads laterally in the vicinity of the print surface and oozes out.
Resolution, and does not cause a decrease in resolution.
High color saturation can be maintained even after printing.
Water-soluble ink is used for inkjet printer microphone
To the metal roll provided immediately after the outlet of the low-wave dryer
After transfer, the transferred water-soluble ink is re-transferred to paper.
It will not cause paper stains. Therefore, the OCR used in this system
The paper must be at least printable on a form press.
Combines printing suitability for inkjet printers
It is necessary to be. However, conventional OCR paper
Recording by inkjet recording method using water-soluble ink
Bleeding or water-soluble ink when wet
There is a problem that flows. [0006] SUMMARY OF THE INVENTION Accordingly, an object of the present invention is as follows.
Is suitable for conventional OCR paper, and
Inkjet printing system equipped with a rotary press
Good ink setting, no bleeding in the image
Providing OCR paper that is clear and has water resistance to images
It is to be. [0007] Means for Solving the Problems The present inventors have developed a rosin-based
The information recording surface of the base paper with the internal sizing agent
A coating layer mainly composed of fat and styrene acrylic resin
JIS P 8129 2.1 of the information recording surface
The surface strength specified in JIS is 16A or more and JIS
The 120-second cobb size specified in P 8140 is 30
~ 45g / m²And stipulated in JIS P8122.
The characteristic feature is that the degree of size is 35 to 65 seconds.
OCR paper solves the above problems
The present invention has been completed. [0008] DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an OCR sheet according to the present invention will be described.
This will be described in detail. The inventor of the present invention has conducted intensive studies and as a result,
Good with inkjet printer using water-soluble ink
Good printability and high water resistance of printed records
To achieve this, penetrate the printed water-soluble ink into the paper layer.
Water-soluble ink in the paper layer.
A cationic reactant that completely fixes
In addition to adding and / or applying external additives,
Rosin-based sizing agent added to the base paper and applied to the surface
Surface sizing agent based on styrene acrylic resin
By controlling the ratio of
Optimum water absorption, blurring of print quality, water resistance and image density
It was found that the balance can be adjusted as follows. Internal sizing agent mainly composed of rosin resin
Starch, etc. for the purpose of improving surface strength
Ink containing cationic resin as the main component
Provides fixing layer and prevention of bleeding and water resistance of water-soluble ink
Surface sizing agent based on styrene acrylic resin
And apply with a size press. [0011] The amount of the internal sizing agent added and applied to the surface
Of starch, cationic resin and surface sizing agent
Water by inkjet recording
Water absorption, bleeding of print quality, water resistance, image density
Is controlled to be optimal. That is, the present invention relates to a foam rotary press.
Print and work suitability, and
Higher ink than water-soluble ink used in printers
Has absorption capacity, high ink absorption speed, high resolution, and high color
That is, the printed water-soluble ink is fixed in the paper layer.
For inkjet printers that exhibit high water resistance
Particularly suitable OCR paper is the outer layer of pulp fiber base paper or the like.
And / or polyacrylamide, polyamide for inner layer
Contains a cationic resin such as epichlorohydrin, and
The inner layer contains rosin-based resin and the outer layer contains styrene acrylic
It is characterized by containing a resin. As the cationic resin, polyacrylamide
Paper, polyamide epichlorohydrin, etc.
The cation resin is added to the outside of the pulp fiber base paper.
In order to make it contained in the layer, it is necessary to apply
Or by impregnation, to be contained in the inner layer
Can be performed by internal addition. As the cationic resin, polyacrylamide
And polyamide epichlorohydrin are economically favorable.
Good. The sizing agent to be externally added is styrene acrylic
Surface sizing agents such as fats and the like;
Does not affect the reactants because it is used as a mixture with resin
Cationic surface sizing agents are preferred. Anionic surface
The size agent is chemically reactive with the cationic resin which is cationic.
This is undesirable because it causes agglutination. As an external sizing agent, of course, nonio
Needless to say, a functional surface sizing agent can be used. Furthermore, a cationic resin and a surface sizing agent
At the same time, oxidized starch and self-modified starch
Seed starch can be used in combination. The content ratio of the surface sizing agent is as follows:
120 second cobb size according to ISP 8140
Is 30 to 45 g / m²Contained on both sides of the papermaking paper
And dried. In particular, JIS P 81
120 seconds cobb size degree conforming to 40 35-40g
/ M²It is desirable that To JIS P 8140
120g cobb size conforming to 45g / m²Beyond
The water-soluble ink after inkjet printing is close to the paper surface.
The sideways spread sideways and oozes out the recorded image (text
Character and image blurring). JIS P
  Cobb size according to 8140 is 30 g / m²Not yet
If it is full, the water-soluble ink will not absorb well into the paper layer.
And the water resistance of the ink deteriorates.
No. In addition, an inkjet printer
Bet and numbers are printed, and each letter and number are clearly outlined
Check whether characters or images are bleeding.
Include surface sizing agent on both sides of papermaking
Is preferred. Further, printing with an ink jet printer
After that, leave the OCR paper in a hot air dryer at 105 ° C for 3 minutes.
And further immersed in water at 25 ° C. for 30 seconds,
Water resistance so that there is no bleeding of printed ink
Include surface sizing agent on both sides of papermaking as shown
Is preferred. The addition of the internal sizing agent is carried out on a papermaking machine.
Demonstrates the size effect and absorbs liquid with coating equipment such as size press
Is easy to control, and the size
It is preferable to use one with little change. If a neutral formulation is used as an internal sizing agent,
Gin sizing agent, rosin emulsion size for acidic formulation
Sizing agents are preferred. Incorporation of internal sizing agent into pulp fiber base paper
The rate is neutral rosin size, rosin emulsion size
Agent is based on JIS P8122
Internal addition during base paper making so that the
It is preferred to have. In particular, JIS P8122
Desirably 40 to 60 seconds based on the degree of Stekicht size
Good. Rhinoceros rhinoceros based on JIS P8122
If the misalignment is less than 35 seconds, the water-soluble ink
Print density on OCR paper surface by penetrating inside
Is low, and strikethrough may occur.
Not good. Stequicht based on JIS P8122
When the size exceeds 65 seconds, the water-soluble ink
Ink absorption and water resistance of the ink
Is not preferred. In addition, solid printing with an ink jet printer
Later, the printing surface seems to be already dry within 5 seconds after printing
Includes internal sizing agent in base paper to show excellent ink absorption
Preferably. The pulp fiber base paper used in the present invention
As raw materials for L-BKP and N-BKP,
Used paper that does not affect the suitability as OCR paper
Pulp blending is possible. And the freeness is 450-500cc
It is preferable to use Freeness is 450c
If it is less than c, when used as OCR paper, dimensional stability
Can cause poor performance. Also, the oil absorbency of the paper
Of inks used in offset printing
(Drying property) deteriorates. Freeness exceeds 500cc
The degree of fibrillation of the pulp fibers by beating is small.
Surface strength of OCR paper
Degree is a wax pick test according to JIS P 8129
OCR paper front and back should be 16A or more
Adjustment is preferred. Surface strength is less than 16A
May cause plate contamination due to removal of paper during printing.
Is not preferred. As the filler to be internally added, a water-soluble ink is used.
Using an absorbent filler of calcium carbonate
Talc, clay, synthetic silica, etc.
However, the content in the pulp fiber base paper should be 2 to 10% by weight.
Is preferred. These fillers may be used alone
Alternatively, they may be used in combination. Content exceeds 10% by weight
Then, when processing the foam, perforations, marginal punches, etc.
The blades wear too much, making continuous machining impossible for a long time.
You. In addition, the papermaking power of the paper decreases and the
It is not preferable because the connected operability is deteriorated. Soshi
If the filler content is less than 2% by weight,
Reduces lightness, worsens water-soluble ink absorption
This is not preferred. In addition, the pulp stock solution contains other chemicals.
Known size fixing agents such as sulfate bands, cationic starch and the like
Paper strength enhancer, pitch remover such as talc, caustic soda
A predetermined amount of PH control agent can be mixed and added internally
You. Note that the paper strength enhancer is not only added internally, but also
Needless to say, it may be additionally applied. Here, the inner and outer layers of the base paper are
Sizing agent and styrene
Using an external sizing agent mainly containing a ril resin,
Good ink setting and bleeding by controlling the rate
Optimum image quality, such as clear images with no
The grounds to show suitability are not always clear
Rosin resin fixed to the inner layer of the base paper
And the internal sizing agent that is
For recording of water-soluble inks due to the size developed by reaction
Controls ink penetration in the thickness direction of the paper
Surface coating mainly composed of styrene acrylic resin
Sizing of the water-soluble ink is suppressed by the size of the sizing agent.
It is considered that the internal sizing agent and surface sizing agent
By balancing the additive ratio, the optimal inkjet
Probably due to proper control of Further, styrene, which is a main component of the surface sizing agent,
Water-soluble ink is used due to the thermosetting property of acrylic resin.
Images suitable for printing by the inkjet printer used
This is considered to be due to the provision of image water resistance. Further, the OCR paper of the present invention is formed by a web rotary.
For inkjet printing systems such as
And suitable OCR paper, but commercially available inkjet
Used for other inkjet systems such as printers.
Both are possible. [0032] The present invention will be described in more detail with reference to the following examples.
explain about. Of course, the present invention is based on the following examples.
Is not limited. In each example,% is
Unless otherwise specified, it means "% by weight". EXAMPLE 1 450-cc freeness L-
N-BKP15 with 85% BKP and 600cc freeness
% Pulp stock solution, talc (talc,
Rosin Emulge as internal sizing agent
Size agent (AL-104, manufactured by PMC Japan), and
Polyacrylamide for internal addition (D
S-414, manufactured by Nippon PMC Co., Ltd.)
3.0%, rosin emulsion sizing agent 0.10
% And the internal paper strength enhancer is 0.15%.
The mixture was stirred and made with a twin-wire paper machine. Pressing in the pressing process
Pre-drying process and after-dryer on wet base paper
-During the process, oxidized starch (MS-3800,
Kogyo Co., Ltd.), external paper strength enhancer (ST-481H, PM Japan)
C), and a surface sizing agent (SS-362, Japan P
MC Co., Ltd.) mixed with water and agitated to apply the adjusted coating liquid
Externally applied by an apparatus, and externally applied as shown in Example 1 in Table 1.
3.06 g / m3 in total solid content of additives²  ,this house
1.00 g / m of oxidized starch²  And the external paper strength enhancer is 2.
00g / m²0.06 g / m2 of surface sizing agent²Is based
90.0 g / m of rice tsubo applied to paper², Paper thickness 110μm
OCR paper was obtained. [Embodiment 2] A parameter adjusted in the same manner as in Embodiment 1
Talc (talc, Nippon Talc Co., Ltd.)
Rosin emulsion sizing agent as internal sizing agent
(AL-104, manufactured by PMC Japan)
Polyacrylamide for internal addition (DS-414,
Manufactured by Nippon PMC Co., Ltd.)
Rosin emulsion sizing agent 0.50%, increase internal paper strength
Mixing and stirring to make 0.15% of strong agent
Oxidized starch (MS-3800, Japan Food Processing Co., Ltd.)
Co., Ltd.), external paper strength agent (ST-481H, PMC Japan)
), And a surface sizing agent (SS-362, Nippon PMC)
Co., Ltd.) is mixed with water and stirred, and the adjusted coating liquid is externally applied.
And the total solid content of the external additive as shown in Example 2 in Table 1.
3.04 g / m in quantity²1.00 g of oxidized starch
/ M²2.00 g / m2², Surface rhino
0.04 g / m²Is rice tsubo 9 applied to the base paper
0.0 g / m²OCR paper having a paper thickness of 110 μm was obtained. [Embodiment 3] A parameter adjusted in the same manner as in Embodiment 1
Light calcium carbonate (Tamapar as filler)
TP-121-6S, manufactured by Okutama Industry Co., Ltd.), internal size
Neutral rosin sizing agent (NT-83, Arakawa Chemical Industries)
Manufactured by Kogyo Co., Ltd.)
Lilamide (DS-414, manufactured by Nippon PMC) is used as a filler
Of 3.0% in the base paper and 0.1% in the neutral rosin sizing agent.
30%, internal paper strength enhancer mixed to 0.15%
-An oxidized starch (MS-380) is added to the base paper obtained by stirring and papermaking.
0, manufactured by Japan Food Processing Co., Ltd.), external paper strength enhancer (ST-48)
1H, manufactured by Nippon PMC), and a surface sizing agent (SS-
362, manufactured by PMC of Japan)
The applied coating solution was externally applied and applied as shown in Example 3 in Table 1.
3.04 g / m3 in total solid content of additives²Of which acid
1.00 g / m of modified starch², The external paper strength enhancer is 2.00
g / m²0.04 g / m of surface sizing agent²Became the base paper
90.0 g / m of applied rice tsubo², Paper thickness 110μm O
CR paper was obtained. [Embodiment 4] The parameters adjusted in the same manner as in Embodiment 1
Light calcium carbonate (Tamapar as filler)
TP-121-6S, manufactured by Okutama Industry Co., Ltd.), internal size
Neutral rosin sizing agent (NT-83, Arakawa Chemical Industries)
Manufactured by Kogyo Co., Ltd.)
Lilamide (DS-414, manufactured by Nippon PMC) is used as a filler
Of 3.0% in the base paper and 0.1% in the neutral rosin sizing agent.
30%, internal paper strength enhancer mixed to 0.15%
-An oxidized starch (MS-380) is added to the base paper obtained by stirring and papermaking.
0, manufactured by Japan Food Processing Co., Ltd.), external paper strength enhancer (ST-48)
1H, manufactured by Nippon PMC), and a surface sizing agent (SS-
362, manufactured by PMC of Japan)
The coating solution was externally applied and applied as shown in Example 4 in Table 1.
3.04 g / m3 in total solid content of additives²Of which acid
1.00 g / m of modified starch², The external paper strength enhancer is 2.00
g / m²0.04 g / m of surface sizing agent²Became the base paper
90.0 g / m of applied rice tsubo², Paper thickness 110μm O
CR paper was obtained. [Embodiment 5] The parameters adjusted in the same manner as in Embodiment 1
Light calcium carbonate (Tamapar as filler)
TP-121-6S, manufactured by Okutama Industry Co., Ltd.), internal size
Neutral rosin sizing agent (NT-83, Arakawa Chemical Industries)
Manufactured by Kogyo Co., Ltd.)
Lilamide (DS-414, manufactured by Nippon PMC) is used as a filler
Of 3.0% in the base paper and 0.1% in the neutral rosin sizing agent.
20%, internal paper strength enhancer mixed to 0.15%
-An oxidized starch (MS-380) is added to the base paper obtained by stirring and papermaking.
0, manufactured by Japan Food Processing Co., Ltd.), external paper strength enhancer (ST-48)
1H, manufactured by Nippon PMC), and a surface sizing agent (SS-
362, manufactured by PMC of Japan)
The applied coating solution was externally applied and applied as shown in Example 5 in Table 1.
3.03 g / m3 in total solid content of additives²Of which acid
1.00 g / m of modified starch², The external paper strength enhancer is 2.00
g / m²0.03 g / m of surface sizing agent²Became the base paper
90.0 g / m of applied rice tsubo², Paper thickness 110μm O
CR paper was obtained. [Comparative Example 1]
Talc (talc, Nippon Talc Co., Ltd.)
Rosin emulsion sizing agent as internal sizing agent
(AL-104, manufactured by PMC Japan)
Polyacrylamide for internal addition (DS-414,
Manufactured by Nippon PMC Co., Ltd.)
Rosin emulsion sizing agent 1.00%, internal paper power increased
Mixing and stirring to make 0.15% of strong agent
Oxidized starch (MS-3800, Japan Food Processing Co., Ltd.)
Co., Ltd.), external paper strength agent (ST-481H, PMC Japan)
) Is mixed with water and stirred, and the adjusted coating solution is externally applied.
And the total solid content of the external additive as shown in Comparative Example 1 in Table 2.
3.00 g / m in quantity²1.00 g of oxidized starch
/ M²2.00 g / m2²Became the base paper
90.0 g / m of applied rice tsubo², Paper thickness 110μm O
CR paper was obtained. [Comparative Example 2]
Talc (talc, Nippon Talc Co., Ltd.)
Manufactured), polyacrylamide for internal use as an internal paper strength enhancer
(DS-414, manufactured by Nippon PMC Co., Ltd.)
The prevalence is 3.0% and the internal paper strength enhancer is 0.15%
Oxidized starch (MS-
3800, manufactured by Japan Food Processing Co., Ltd.)
-481H, manufactured by PMC Japan), and a surface sizing agent
(SS-362, manufactured by PMC Japan) is mixed and stirred in water
The coating solution prepared and adjusted was externally applied and shown in Comparative Example 2 in Table 2.
3.10 g / m3 of total solid content of external additives²,
Of these, oxidized starch was 1.00 g / m², External paper strength enhancer
Is 2.00 g / m²0.10 g / m of surface sizing agent²
Is 90.0 g / m of rice tsubo applied to base paper², Paper thickness 11
OCR paper of 0 μm was obtained. [Comparative Example 3] A parameter adjusted in the same manner as in Example 1.
Light calcium carbonate (Tamapar as filler)
TP-121-6S, manufactured by Okutama Industry Co., Ltd.), internal size
AKD sizing agent (AS-261, PMC Japan)
Manufactured), polyacrylamide for internal use as an internal paper strength enhancer
(DS-414, manufactured by Nippon PMC Co., Ltd.)
Prevalence is 3.0%, AKD sizing agent is 0.10%, internal paper
Mix and stir so that the strength enhancer is 0.15%
Oxidized starch (MS-3800, Japan Food Processing Co., Ltd.)
Co., Ltd.), external paper strength agent (ST-481H, Nippon PMC)
And surface sizing agent (SS-362, Japan PM)
(Company C), mixed with water, stirred and adjusted
The solid content of the external additive as shown in Comparative Example 3 in Table 2
3.04 g / m in total²Of which, oxidized starch was 1.0%
0 g / m²2.00 g / m2 ²,surface
0.04 g / m of sizing agent²The rice tsubo applied to the base paper
90.0 g / m ²Obtains OCR paper with a paper thickness of 110 μm
Was. [0041] [Table 1]Examples 1 to 3 prepared as described above and the ratio
For the OCR papers of Comparative Examples 1 to 3, ink manufactured by Canon
Ink amount using jet printer, BJ-220JS
SHQ (super high quality)
-) Printability by ink jet method
Was evaluated for the following 1) to 4). 1) For "ink absorption", solid printing is performed and the part is marked.
Five seconds later, it was evaluated whether or not it had already dried. ：: The ink is absorbed in the paper and the printing surface is not shiny ×: The ink remains on the paper surface and the printed surface is shining 2) "Bleed characters and images" is the alphabet and numbers
Characters and whether the outline of each character and number is clear
The condition was evaluated by visual observation. ：: good ×: bad 3) "Ink water resistance" is a solid, alphabet and numbers
Print and leave in a hot air dryer at 105 ° C for 3 minutes after printing
You. After that, the printed sheet is immersed in water at 25 ° C for 30 seconds.
Then, the degree of bleeding of the ink after immersion was visually evaluated. ○: No bleeding ×: bleeding 4) "Conveyability" is for passing 1000 sheets,
Was evaluated by the presence or absence. ○: All paper passed without any problem ×: Paper passing trouble occurred even with one sheet 5) Form printing suitability by “Wax Pick”
evaluated. Wax pick is JIS P 8129
Measured according to the method using wax, the wax strength is 1
Evaluation was made based on whether or not there was 6A or more. ：: 16A or more ×: Less than 16A 6) The 120-second cobb size is based on JIS P 8140
The measurement was performed according to the above-mentioned rules. 7) The degree of Stekigt sizing is as specified in JIS P8122.
It was measured according to the standard. [0043] The OCR paper of the present invention has a rosin size.
Surface paper, such as starch, on a base paper to which sizing properties are imparted by internally adding an agent.
Use cationic resin and styrene acrylic resin
Apply the blended coating solution and apply JIS P 8129
Of the surface strength test method for paper and paperboard specified in 2.1
The surface strength measured by the method using
Paper and board specified in JIS P 8140
120 second cobb size measured by paper water absorption test method
Is 30 to 45 g / m²To JIS P 8122
Specimen measured using the specified paper Stocht sizing method
By setting the Tecicht sizing degree to 35 to 65 seconds, the conventional O
Water-soluble ink without losing suitability as CR paper
In printing with an inkjet printer using
High ink absorption capacity, high ink absorption speed, high resolution, high color
With printing aptitude and form rotary press with well-balanced saturation
Printing and work suitability.

   ────────────────────────────────────────────────── ─── Continuation of front page    F-term (reference) 4L055 AA02 AA03 AC06 AG48 AG50                       AG63 AG71 AG89 AH11 AH13                       AH16 AH50 AJ02 BE08 EA07                       EA10 FA11 FA15 FA19 GA08                       GA50

Claims (1)

Claims: 1. An information recording surface of a base paper to which a rosin-based sizing agent is internally added, the information recording surface having a coating layer mainly composed of a cationic resin and a styrene acrylic resin. JIS
The surface strength specified in 2.1 of P 8129 is 16A or more, and the 120-second cobb size specified in JIS P 8140 is 30 to 45 g / m ² , and the JIS
The degree of Stekigt stipulated in P8122 is 35-6.
OCR paper characterized by being 5 seconds.