JP2001063210A - Thermal recording method and thermal recording material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal recording method for carrying a heat-sensitive recording material, which is precut into the sheet shape by the pick-up rubber roll method, to a printing section without generating the feed-failure and recording thereon and also provide a thermal recording material thereof. SOLUTION: In a thermal recording method in which a heat-sensitive material precut into the sheet shape is carried to a feeding and printing section by a pick-up rubber roll, the thermal recording material having the 5 gf.cm or higher degree of rigidity in the lateral direction and also the 0.35 or lower static friction coefficient generated by overlapping the surface with the back is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive recording material, and more particularly, to a heat-sensitive recording material precut into a sheet and conveyed to a printing unit without a non-feed in a printing apparatus having a sheet feeding unit by a pickup rubber roll system. The present invention relates to a thermosensitive recording material which can be used.

[0002]

2. Description of the Related Art A thermosensitive recording material provided with a thermosensitive coloring layer on a support can be obtained at a relatively low cost, a recorded image can be obtained with a relatively simple apparatus, and furthermore, maintenance is easy and noise is small. Due to these advantages, they are widely used as recording materials for facsimile machines, POS label printers, ticket vending machines, and the like.

[0003] Recording using such a heat-sensitive recording material has recently been diversified, and is used not only for recording by a conventional printing device in the form of a roll but equipped with an auto cutter, but also for ticket applications such as event admission tickets and public gambling voting tickets. Printing is performed on a thermosensitive recording material having a high rigidity and a large paper thickness, and is used after being precut in a sheet shape. Then, from the form of the precut recording material,
The recording material is set in a state of being stacked on the paper feeding unit of the printing apparatus, and its feeding is performed by a pickup rubber roll located below the paper feeding unit, and is conveyed to the printing unit (see FIG. 1).

A recording material used in a printing apparatus having such a paper feeding system is required to be smoothly fed. As a known example related to paper feeding, for example, Japanese Patent Application Laid-Open No. 8-332774 discloses that the back surface static friction of a heat-sensitive recording material is improved in order to improve the transportability of the sheet-like heat-sensitive recording material when an automatic sheet feeder is used in a word processor or the like. It has been proposed to prevent double feeding and non-feeding by setting the ratio of the coefficient to the surface static friction coefficient (the coefficient of the static friction of the back surface / the coefficient of the static friction of the surface) to be 0.5 to 2.0. The paper feeding mechanism using this auto sheet feeder generally employs a roller paper feeding system, in which the recording material is sandwiched between a paper feeding roller and a pressure plate, and the recording paper is driven from a corner claw portion by driving the paper feeding roller. Paper is fed out. That is, as shown in FIG. 2, the pressure plate 20 at the lower portion of the tray 10 is pushed up, the bundle of paper 50 is pressed against the paper feed roller 30, the roller 30 is rotated, the end of the paper is bent, and the corner claw 40 is passed over to feed the paper. The way you are.

[0005] However, according to the method using the automatic sheet feeder, as can be seen from FIG. 2, it becomes difficult to get over the claw 40 when the sheet or card is thick or the rigidity is high. Therefore, a pickup rubber roll system as shown in FIG. 1 is employed. According to this method, operability is very good because thick sheets can be used, and when replenishing paper, it is only necessary to replenish the tray from the top without removing the tray. However, even if a heat-sensitive recording material having a ratio of the static friction coefficient between the front surface and the back surface of the paper of 0.5 to 2.0 is used, sufficient transportability cannot be obtained.

[0006]

As described above, a thermosensitive recording material having a high rigidity, a large paper thickness, and a pre-cut sheet is set in a state where the thermosensitive recording material is overlaid on a paper feeding section of a printing apparatus. In the mechanism that is fed out by the drive of the pickup rubber roll located below the paper feed unit and transports it to the printing unit, the weight of the stacked thermosensitive recording material acts as the load pressure on the pickup rubber roll, and such an action occurs. It is very difficult to obtain a sufficient grip force of the pickup rubber roll underneath, and a problem often occurs that causes non-feeding.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to provide a heat-sensitive recording method and a heat-sensitive recording material having good and reliable transportability in matching with a heat-sensitive recording apparatus in which a paper feed unit is a pickup rubber roll system. The purpose is to gain.

[0008]

According to the present invention, there is firstly provided a thermal recording method wherein a thermosensitive recording material pre-cut into a sheet is fed by a pickup rubber roll and conveyed to a printing section for recording. A thermal recording method characterized by using a material having a lateral rigidity of 5 gf · cm or more and a static friction coefficient of 0.35 or less due to superposition between the front surface and the back surface. .

Second, in the heat-sensitive recording method described in the first aspect, the heat-sensitive recording material is provided with a heat-sensitive recording layer containing a colorless leuco dye having an electron donating property and a developer having an electron accepting property on a support. And a thickness (paper thickness) of 150 μm or more is provided.

Thirdly, there is provided a thermal recording method according to the first or second aspect, wherein the thermal recording material has a back layer containing zinc stearate or montan wax. You.

Fourthly, there is provided a heat-sensitive recording material specified in the heat-sensitive recording method described in the first, second or third aspect.

The rigidity is measured according to JIS P 8125
(Stiffness test method of paperboard by the load bending method) is measured. The static friction coefficient is JIS P 8147
(Method of testing coefficient of friction of paper and paperboard).
A weight having a width of 45 mm, a length of 60 mm, and a mass of 145 g is used. The weight is represented by the tangent (tan θ) of the angle at which sliding starts, and the average value of the five test values is the decimal point according to JIS Z8401 (rounding of numerical values). The following values are rounded to two digits. A thermosensitive recording material was attached to the slope with the surface facing up, and the recording material was attached to a weight so that the bottom surface of the recording material was the bottom surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The characteristics of the heat-sensitive recording material of the present invention are as follows.
The heat-sensitive recording material pre-cut into a sheet is in the horizontal direction (C
D) has a stiffness of 5 gf · cm or more, a static friction coefficient due to superposition between the front surface and the back surface of 0.35 or less, and a paper thickness of 15
The point is that it is 0 μm or more. The paper feed section of the printing apparatus is fed out by a pickup rubber roll system, and a suitable number of thermosensitive recording materials precut into sheets are set in the paper feed section. Therefore, if the coefficient of static friction when the front and back surfaces of the heat-sensitive recording material are overlapped exceeds 0.35, the drive of the pickup rubber roll which does not have a sufficient gripping force against the load of the set heat-sensitive recording material. In the case of feeding, the slip resistance between the surfaces of the thermal recording materials greatly influences, a slip phenomenon easily occurs between the surfaces of the thermal recording materials in contact with the pickup rubber rolls, and it is possible to separate the stacked thermal recording materials. As a result, it is easy to cause conveyance failure, and the intended object of the present invention cannot be achieved.

In order to reduce the static friction coefficient by superposition between the front and back surfaces of the heat-sensitive recording material to 0.35 or less, a value of 0.35 or less can be obtained by appropriately combining the constituent materials of the surface layer and / or the back surface layer. The method is performed by applying a higher fatty acid amide, a higher fatty acid ester, various kinds of animal, vegetable, mineral or petroleum waxes used as a lubricant on the surface or the bottom surface of the heat-sensitive recording material. However, it is not limited to these materials.

In the present invention, the heat-sensitive recording layer provided on the support is not particularly limited, and a diazo-type heat-sensitive recording layer which is colored by a hot reaction between a diazonium salt compound and a coupler; Leuco-type thermosensitive recording layer, which develops color by the thermal reaction of a leuco dye with an electron-accepting developer, and the chelate-type thermosensitive layer, which develops a color by the thermal reaction of a gallic acid derivative with a higher fatty acid metal salt Although a recording layer and the like can be mentioned, a leuco-type heat-sensitive recording layer is effective in consideration of color development sensitivity, density, manufacturing cost, and the like. further,
In the present invention, an undercoat layer may be provided on the support for uniformity and high sensitivity of the heat-sensitive recording layer, or for improving heat insulation, for improving the storage stability of the recorded image and matching with the thermal head. A protective layer may be provided on the heat-sensitive recording layer in order to improve the recording properties.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Prior to the description of the embodiments, a printing apparatus having a pickup unit of a pickup rubber roll type will be described. FIG. 1 is a schematic view showing the vicinity of a sheet feeding unit of a printing apparatus according to an embodiment of the present invention. Thermal recording material 5 cut into sheets
Is set in the paper feeding unit 6, is driven by the pickup rubber roll 1, passes through the guide plate 2, the gap of which is adjusted to be fed one by one to the printing unit, and is heated and printed by the thermal head 4 to obtain a thermosensitive recording image. Next, examples of the heat-sensitive recording material will be described. The parts and percentages shown below are based on weight.

[0017]Examples 1-3, Comparative Examples 1-3  [Solution A] 3-butylamino-6-methyl-N-7-anilinofluoran 20 parts 10% aqueous solution of polyvinyl alcohol 20 parts Water 60 parts [Solution B] 4-isopropoxy-4'-hydroxydiphenylsulfone 25 Parts 10% aqueous solution of polyvinyl alcohol 25 parts Water 50 parts [Solution C] 20 parts of calcium carbonate 20 parts of 5% aqueous solution of methyl cellulose 20 parts Water 60 parts
[Solution A], [Solution B] and [C
Liquid] was prepared. Next, [Solution A] 15 parts, [Solution B] 45
Parts, [Liquid C] 45 parts and isobutylene / maleic anhydride
Mix and stir 10 parts of 20% aqueous alkali solution of the copolymer
A thermosensitive coloring layer forming solution [D solution] was used. [E Solution] 10% aqueous solution of polyvinyl alcohol 50 parts Calcium carbonate 2.5 parts Zinc stearate 0.2 parts Water 47.3 parts The above mixture was dispersed in a sand mill, and the average particle size was 1.0 μm.
[E Solution] was prepared as follows. Next, [E solution] 10
10% water of polyamide epichlorohydrin copolymer
Two parts of the solution were mixed and stirred to form a protective layer forming solution [Solution F]. [Solution G] 5% aqueous solution of methylcellulose 20 parts Zinc stearate 10 parts Water 70 parts [Solution H] 5% aqueous solution of methylcellulose 20 parts Montan wax 10 parts Water 70 parts Each of the above mixtures was dispersed by a sand mill, and the average particle size was adjusted.
Prepare [Solution G] and [Solution H] to 1.0 μm.
Was. [Solution I] 10% aqueous solution of polyvinyl alcohol 10 parts Rice starch 10 parts Water 80 parts The above mixture was stirred to prepare a starch suspension. [Formation of thermosensitive coloring layer] Table 1 shows the thermosensitive coloring layer forming solution [D solution].
Dye adhesion after coating and drying on a high-quality paper support of the basis weight shown in
0.5g / m²The thermosensitive coloring layer was provided so that [Formation of Protective Layer] Protective layer forming solution [solution F]
2g / m after coating and drying²So that
A protective layer was provided. [Formation of backcoat layer] The aforementioned [G solution], [H solution],
As shown in Table 1, each of [Liquid I] was coated with each heat-sensitive coloring layer / protective layer.
The total amount of adhesion after coating and drying on the back of the cloth-dried support is 2
g / m²The back coat layer was provided as follows. Less than
Calendar the sample prepared as above
Thus, heat-sensitive recording materials of Examples and Comparative Examples were obtained. The evaluation
Table 1 shows the results.

[0018]

[Table 1]

[0019]Evaluation of transportability  ：: The rate of occurrence of defective transport is less than 1%. Δ: The rate of occurrence of defective transport is 1% to less than 5%.Measurement of transverse (CD) stiffness  In the case of cardboard (base paper),
Stiffness in the direction perpendicular to I.e. perpendicular to the machine
Stiffness when bent by load in various directions. For example, rhino
66, width 82.6 mm × length (flow direction of papermaking)
With a 7mm ticket, the 82.6mm width side is supported and fixed,
Measure after bending.Measurement of static friction coefficient  The coefficient of static friction is JIS P 8147 (the friction coefficient of paper and paperboard).
Number test method). The weight is 45mm in width,
Use the one with a length of 60mm and mass of 145g, and start sliding
Expressed as the tangent of the starting angle (tan θ), five test values
Average value of JIS Z 8401 (How to round the numerical value)
Is a value rounded to two decimal places. Thermal recording material on slope
With the surface facing up, and the bottom of the recording material
The measurement was carried out by attaching to the bottom surface.

From Table 1, the heat-sensitive recording materials of Examples have a coefficient of static friction between the front and back surfaces of 0.35 or less, a CD rigidity of 5 or more, and a paper thickness of 150 μm or more. In contrast, the thermosensitive recording material of the comparative example has a coefficient of static friction between the front and back surfaces of 0.
The CD stiffness is lower than 5.0 even if the static friction coefficient is larger than 35 or the static friction coefficient is 0.35 or less. In the former case, the conveyance failure occurrence rate is as high as 5% or more. In the latter case, the transport failure occurrence rate is lower than in the former case, but cannot be suppressed to less than 1%.

[0021]

As described above, according to the present invention, it is possible to obtain a heat-sensitive recording material having a very low conveyance failure rate by using a paper feed unit in a pickup rubber roll type heat-sensitive recording apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of the vicinity of a paper feeding unit of a thermal recording apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram illustrating an example of a sheet feeding unit using an automatic sheet feeder.

[Explanation of symbols]

 1 Pickup Rubber Roll 2 Gap Adjusted Guide Plate 3 Platen Roll 4 Thermal Head 5 Sheet-cut Thermal Recording Material 6 Paper Feeding Unit 10 Tray 20 Pressure Plate 30 Paper Feed Roller 40 Corner Claw 50 Bundle of Thermal Recording Material

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Claims (4)

[Claims] 1. A thermosensitive recording method in which a thermosensitive recording material pre-cut into a sheet is fed by a pickup rubber roll and conveyed to a printing section for recording, wherein the thermosensitive recording material has a lateral rigidity of 5 gf · cm or more; , The coefficient of static friction due to superposition between the front and back surfaces is 0.3
A thermosensitive recording method, characterized by using one having 5 or less. 2. The thermal recording method according to claim 1, wherein
The heat-sensitive recording material is provided with a heat-sensitive recording layer containing a colorless leuco dye having an electron donating property and a developer having an electron accepting property on a support, and has a thickness (paper thickness) of 150 μm or more. Characteristic thermal recording method. 3. The heat-sensitive recording method according to claim 1, wherein said heat-sensitive recording material has a back layer containing zinc stearate or montan wax. 4. A thermosensitive recording material as defined in the thermosensitive recording method according to claim 1, 2 or 3.