JP3581236B2 - Recording medium with adhesive layer and recording method using the same - Google Patents

Description

【図面の簡単な説明】
【図１】本発明による記録媒体の一実施例の形態を示す斜視図である。
【図２】図１におけるＩＩ−ＩＩ断面図である。
【図３】記録媒体と非接触状態で記録を行う記録ヘッドと、記録媒体の搬送方向をプリンタ内において変える手段とを備えたプリンタの具体例の模式図である。
【図４】記録媒体１０が紙送りローラ１に巻き回された状態の断面図を表した図である。
【図５】図２の記録媒体の部分拡大図である。
【図６】（ａ）はガーレ剛軟度を測定可能なガーレ試験機を表し、（ｂ）は、（ａ）のガーレ試験機の主要部を示すものである。
【図７】ＪＩＳ−Ｚ−０２３７保持力試験に用いられる自動式圧着装置である。（ａ）は装置の全体図であり、（ｂ）は（ａ）のローラの部分の側面図である。図中、７１はローラであり、このローラの表面はゴム層７２にて覆われている。また、７３はモータであり、７４は歯車である。このローラの直径ｄは約８３ｍｍ、幅ｌは４５ｍｍである。また、ゴム層７２の厚さｅは約６ｍｍである。
【図８】ＪＩＳ−Ｚ−０２３７保持力試験に用いられる手動式圧着装置である。図中、８１はローラであり、８２はハンドルである。
【符号の説明】
１０ 記録媒体
１１ 記録シート
１２ 粘着層
１３ 剥離シート
１ 紙送りローラ
２、３、および４ 圧接ローラ
５ シートガイド
６ 記録ヘッド
７ａおよび７ｂ 排紙ローラ[0001]
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION The present invention relates to a recording sheet having an adhesive layer on which recording is performed using a printer device.
[0002]
2. Description of the Related Art There are two types of printers that perform recording on a recording medium, in which recording is performed by contacting a recording head with a recording medium, and those that perform recording without contacting a recording head.
[0003]
On the other hand, in order to reduce the size of the printer, a printer provided with means for changing a recording medium conveyance direction in the printer has become mainstream. For example, there is known a printer in which a recording medium is wound around a drum in a printer and means for changing a conveying direction of the recording medium is provided.
[0004]
In a printer provided with such a means for changing the transport direction of the recording medium and having a non-contact type recording head, it has been observed that the recording medium comes into contact with the recording head. . Such contact of the recording medium with the recording head is remarkably observed in the recording medium provided with the adhesive layer.
[0005]
The contact of the recording medium with the recording head may cause stains on the printed matter, a failure of the recording head, and the like, and is therefore desirably prevented.
[0006]
First, some of the present inventors have used an acrylic cross-linkable pressure-sensitive adhesive as an adhesive in order to prevent such a recording medium from coming into contact with a recording head, and using a recording medium having specific physical properties. (Japanese Patent Application No. 9-62771).
[0007]
Summary of the Invention
The present inventors have recently proposed means for changing the transport direction of the recording medium in the printer by adding a specific tackifier to the adhesive in the recording medium previously proposed by some of the present inventors. It has been found that contact between the recording medium and the recording head in a printer having the above can be more effectively prevented. The present invention is based on such findings.
[0008]
Accordingly, it is an object of the present invention to provide a recording medium which is hard to contact a recording head in a printer.
[0009]
Another object of the present invention is to provide a recording method in which contact between a recording medium and a recording head is small.
[0010]
The recording medium according to the present invention is a recording medium having a recording sheet, an adhesive layer formed of an adhesive formed on one surface of the recording sheet, and a release sheet provided on the adhesive layer,
The pressure-sensitive adhesive is an acrylic cross-linking pressure-sensitive adhesive containing a tackifier having a softening point of 70 ° C. or higher, and in a JIS-Z-0237 holding force test, the time to drop is 100 minutes or more. If it is present, or if the time until the drop is less than 100 minutes, it is broken at the interface between the adherend and the adhesive layer and falls.
[0011]
Further, the recording method according to the present invention,
What is claimed is: 1. A printer comprising: a recording head that performs recording in a non-contact state with a recording medium; and means for changing a conveyance direction of the recording medium in the printer while drawing an arc, wherein the central angle of the arc is about 120 to about 200 degrees. And a step of introducing the recording medium according to the present invention into a printer having a radius of the arc of about 10 to about 50 mm and performing recording on the recording medium by the recording head.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred specific examples of the recording medium according to the present invention are as shown in FIG. 1, and FIG. 2 is a sectional view taken along the line II-II in FIG.
[0013]
As shown in the figure, a recording medium 10 includes a recording sheet 11, an adhesive layer 12 made of an adhesive formed on the back surface of the recording sheet 11, and a release sheet 13 attached to the adhesive layer 12. Have. The recording medium according to the present invention is such that the release sheet 13 can be peeled off and the recording sheet 11 can be stuck to an appropriate place via the adhesive layer 12.
[0014]
The recording medium according to the present invention has a Gurley-type softness, preferably about 200 to 1500 mgf, and preferably about 400 to 1000 mgf, in the conveying direction of the printer.
[0015]
Further, in the recording medium according to the present invention, in the JIS-Z-0237 holding force test, when the time to fall is 100 minutes or more, or the time to fall is less than 100 minutes, the adherend and the adhesive layer Breaks at the interface of, separates and falls. Here, the following three modes can be considered as modes in which the recording medium falls. (1) When it breaks down at the interface between the adherend and the adhesive layer 12 used in the above test and falls, (2) when it breaks down in the layer of the adhesive layer 12 and falls, and (3) recording This is a case where the sheet 11 breaks down at the interface between the sheet 11 and the adhesive layer 12 and falls. However, since the mode (3) means that the adhesive layer 12 is easily peeled off from the recording sheet 11, this is not preferable, and therefore, in the present invention, the above-mentioned (1) or (2) The recording sheet falls in this manner.
[0016]
A recording medium that satisfies the conditions in the Gurley-type rigidity and the holding force test includes a recording head that performs recording in a non-contact state with the recording medium, and a unit that changes a transport direction of the recording medium in the printer. In this case, the contact between the recording medium and the recording head can be effectively prevented, and thus, an appropriate image can be formed. In the present invention, the means for changing the recording medium conveyance direction in the printer changes the recording medium conveyance direction while drawing an arc on the recording medium, and the arc has a central angle of about 120 to about 200 degrees, preferably about 130 to about 190 degrees, and the radius of the arc is about 10 to about 50 mm, more preferably about 12 to about 30 mm.
[0017]
FIG. 3 is a schematic diagram of a specific example of a printer including a recording head that performs recording in a non-contact state with a recording medium, and a unit that changes a transport direction of the recording medium in the printer.
[0018]
The printer shown in FIG. 3 includes a paper feed roller 1, pressure rollers 2, 3, and 4 pressed against the paper feed roller 1, a sheet guide 5, and a non-contact recording head such as an inkjet head. 6 and paper discharge rollers 7a and 7b. In this printer, a recording medium 10 is supplied to a paper feed roller 1 by a paper supply unit (not shown) in a direction indicated by an arrow A. The recording medium 10 is wound and transported in a state in which the recording medium 10 is in close contact with the paper feed roller 1 by the pressing forces of the pressing rollers 2, 3, and 4. The leading end 10a of the recording medium 10 is separated from the paper feed roller 1 at the position of the pressing roller 4, and is guided below the recording head 6 by the sheet guide 5. Then, the image formation is started by the recording agent (in the case of the ink jet recording method, a discharged ink droplet) from the head 6. Further, as the recording medium is conveyed, the leading end 10a of the recording medium 10 enters between the paper discharge rollers 7a and 7b, and is further recorded while being discharged.
[0019]
The means for changing the conveyance direction of the recording medium shown in FIG. 3 is a paper feed roller 1 and pressure rollers 2, 3, and 4 pressed against the paper feed roller 1. The configuration is not limited to the above configuration as long as the recording medium can change the transport direction while drawing an arc. In the apparatus shown in FIG. 3, the arc is defined by a point at which the recording medium 10 first contacts the paper feed roller 1 and a force at which the recording medium 10 changes the transport direction of the paper feed roller 1. It means up to the point C in the figure, which is the point to be released. The central angle of this arc is ω in the figure, and its radius substantially matches the radius d of the paper feed roller 1.
[0020]
In the present invention, the circular arc includes not only a circular arc composed of a part of a perfect circle but also a partial arc of an ellipse. In the present invention, a part of the arc of the ellipse can be regarded as a circular arc having a radius that is an intermediate value between the long axis and the single axis of the ellipse.
[0021]
When the recording medium according to the present invention is used, the recording is performed without the front end 10a of the recording medium 10 touching the surface 6a of the recording head 6 facing the recording medium 10, and enters between the paper discharge rollers 7a and 7b. If the leading end of the recording medium 10 is warped as shown by 10b, an appropriate distance between the recording head 6 and the recording medium 10 cannot be obtained, and a defective image may be formed. Further, there is a possibility that a substance detached from the recording medium 10 adheres to the surface 6a of the recording head 6 and causes a failure of the recording head 6. If the warpage of the leading end is within a certain range, the recording medium 10 enters between the paper discharge rollers 7a and 7b, but if the warpage is large, the recording medium 10 does not enter between the paper discharge rollers 7a and 7b, There is a possibility that a discharge failure may occur. Further, if the warpage of the leading end is within a certain range, the recording medium 10 enters between the paper discharge rollers 7a and 7b, but as a result of the recording medium 10 being held at one end by the paper discharge rollers 7a and 7b, There is a possibility that an appropriate space between the recording head 6 and the recording medium 10 cannot be obtained due to floating from the guide 5 and a defective image may be formed. In the recording medium 10 according to the present invention, the formation of warpage as shown by 10b at the leading end is small. Therefore, contact between the recording medium and the recording head can be effectively prevented, and an appropriate image can be formed.
[0022]
As described above, according to the recording medium of the present invention, warpage of the leading end of the recording medium can be effectively prevented. As a result, the recording medium 10 is conveyed substantially horizontally with the sheet guide 5. Therefore, in a printer using the recording medium according to the present invention, the position of the recording head 6 is not particularly limited. However, a general non-contact recording head, for example, a recording head for ink jet recording, is formed by a recording medium on the sheet guide 5 and a recording head. Is about 1 mm to about 5 mm. The position of the recording head 6 is generally the distance from the point C at which the recording medium 10 is released from the force of the paper feed roller 1 for changing the transport direction to the end of the recording head 6 on the paper feed roller 1 side. Typically, the distance from the discharge rollers 7a and 7b to the end of the recording head 6 on the discharge roller side is generally about 5 to 30 mm.
[0023]
The reason why the recording medium according to the present invention effectively prevents warpage of the leading end of the recording medium is not clear, but the expected mechanism is as follows. However, the following description is only an assumption, and the present invention is not limited to this mechanism.
[0024]
FIG. 4 is a cross-sectional view illustrating a state where the recording medium 10 is wound around the paper feed roller 1. The recording medium 10 that is curved along the paper feed roller 1 moves along the transport direction of the recording medium 10 with respect to the adhesive layer 12 due to a difference in inner diameter between the recording sheet 11 and the adhesive layer 12 (that is, a difference in circumferential length). A compressive force P acts, and the adhesive layer 12 contracts due to the compressive force P. Thereafter, when the recording medium 10 separates from the paper feed roller 1, it is considered that the compressive force P is lost and the adhesive layer 12 is excessively elongated. It is considered that the recording medium according to the present invention could effectively prevent the excessive elongation by controlling the result of the JIS-Z-0237 retention force test.
[0025]
The details of the JIS-Z-0237 holding force test are as follows.
(1) Test pieces Three test pieces each having a width of 25 mm and a length of about 150 mm are taken from the sample.
[0026]
(2) Test plate The test plate is prepared by cutting a SUS304 steel plate having a thickness of 1.5 to 2.0 mm specified in JIS G 4305 into a width of about 50 mm and a length of about 125 mm. The surface is lightly indexed in the width direction of the test plate with a water-resistant abrasive paper of No. 280 specified in JIS R 6253, and is uniformly polished in the length direction over the entire length until the index completely disappears. To clean the test plate, apply a solvent to the surface and wipe the surface of the test plate with gauze or the like. After drying, wipe again with the prescribed solvent, and then wipe thoroughly with new gauze until it is dry. Washing with such a solvent is repeated three times or more until it is visually recognized that the solvent is clean. The solvent is a suitable solvent such as hexane, gasoline, ethanol, isopropyl alcohol, toluene and the like, and is used for testing or for industrial use without residue. In addition, a material such as gauze, silk cloth, or tissue paper that does not break fibers during use and does not detach such as a single fiber and does not contain an additive soluble in the above-described solvent is used.
[0027]
(3) Crimping device An automatic type as shown in FIG. 7 and a manual type as shown in FIG. 8 are used. Each device has a structure in which only the mass of the roller is applied to the test piece when the test piece is pressed. The mass of the roller is 2000 ± 50 g.
[0028]
(4) Test method The test piece was adhered to one end of a cleaned test plate so that an area of 25 × 25 mm of the test piece was in contact with the test plate, and the unattached portion was folded with the adhesive surface inside.
[0029]
The roller is reciprocated one time at a speed of about 300 mm per minute from above the test piece and pressed.
[0030]
After a lapse of 20 minutes or more, one end of the test plate is stopped with a clasp so that the test plate and the test piece hang vertically, and a 1 kg (9.807 N load) weight is attached to the end of the folded portion. The weight should be applied gently, not to swing, and care should be taken not to apply any force other than the specified load to the test piece.
[0031]
Measure the time until the test piece falls from the test plate. The results are expressed as the time until the test piece falls. The test is performed on three test pieces, and the average value is obtained.
[0032]
According to a preferred embodiment of the present invention, the recording medium according to the present invention preferably has a Gurley-type softness of about 200 mgf to 1500 mgf. In the present invention, the Gurley-type bending resistance is measured, for example, by a test method specified in JIS-L-1096. The details of the test method are as follows.
[0033]
First, five test pieces each having a length of Lcm and a width of dcm are collected in the vertical direction and the horizontal direction of the recording medium. The measurement is performed using a Gurley tester as shown in FIG. FIG. 6B shows a main part of the tester. The test piece 60 is attached to the chuck 61 and fixed to the chuck 61 in accordance with the scale L / 2.54 on the movable arm 62. Next, appropriate loads Wa (g), Wb (g) and Wc (g) are applied to the load mounting holes a, b and c below the fulcrum 64 of the pendulum 63, and thereafter the movable arm 62 is rotated at a constant speed. The numerical value RG on the dial 65 when the test piece 60 separates from the pendulum 63 is read, and the bending resistance is obtained by the following equation. The bending resistance is measured on the front and back of each of five test pieces, and is represented by an average value in each of the vertical direction and the horizontal direction (up to one decimal place). In FIG. 6B, A represents a movable arm, and B represents a pendulum.
Bending degree (N (mgf) = RG × (aWa + bWb + cWc) × (L ² /d)×0.306
(Where a, b, and c represent the distance (cm) between the load mounting hole and the fulcrum)
[0034]
According to a preferred embodiment of the present invention, a preferred embodiment of the structure of the recording medium according to the present invention is a structure as shown in FIG. FIG. 5 is a partially enlarged view of a cross-sectional view of the recording medium shown in FIG.
[0035]
As shown in FIG. 5, the recording sheet 11 preferably includes a substrate 11a and a recording agent receiving layer 11b formed on the surface thereof.
[0036]
As the base material 11a, an appropriate sheet material such as high-quality paper, glassine paper, synthetic paper, polyester film, polypropylene film, or the like can be used.
[0037]
The recording agent receiving layer 11b is a layer that receives a recording agent recorded on a recording medium in a non-contact state from a recording head. This layer may be appropriately selected depending on the type of the recording agent. For example, when recording is performed with an ink composition from a recording head (for example, an ink jet recording method), the recording agent receiving layer 11b is known in the art or suitably known in the art for appropriately absorbing and holding the ink. Ink receiving layer. The ink receiving layer can be formed from, for example, a pigment, a binder resin, and other various additives. As the pigment, silica, zeolite, calcium carbonate, diatomaceous earth, clay, talc, aluminum oxide, aluminum hydroxide and the like can be used. As the binder resin, polyvinyl alcohol, polyvinylpyrrolidone, casein, gelatin, a copolymer of acrylic acid ester, polyacrylamide, polyethylene oxide, ethylene-vinyl acetate copolymer, cellulose derivative and the like can be used. As an additive, an ultraviolet absorber, a preservative, an antioxidant, a pH adjuster, a surfactant, an antifoaming agent and the like can be used in combination. According to a preferred embodiment of the present invention, the ink receiving layer, a mixture of the components to the substrate 11a, was applied in the range of 0.1g ^{/ m 2} ~50g ^/ m 2 of the coating amount after drying, the recording sheet 11 Is preferably formed with a total thickness of 80 μm or more, preferably about 90 to 250 μm.
[0038]
Further, according to a preferred embodiment of the present invention, the recording sheet itself has a Gurley-type flexibility, preferably a Gurley-type flexibility in the transport direction of the printer, of about 35 to 700 mgf. Preferably, it is about 100 to 400 mgf.
[0039]
In the present invention, the adhesive layer 12 is formed of an acrylic cross-linkable adhesive. That is, the pressure-sensitive adhesive is an acrylic cross-linking type, a low Tg main monomer component for imparting tackiness, a high Tg comonomer component for imparting adhesiveness or cohesive strength, and a functional group for improving crosslinking and adhesion. A polymer or copolymer mainly containing a group-containing monomer component can be used.
[0040]
The main monomer components include ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate and other alkyl acrylates, butyl methacrylate, and 2-methacrylic acid. Alkyl methacrylates such as ethylhexyl, cyclohexyl methacrylate, and benzyl methacrylate can be used.
[0041]
Examples of the comonomer component include methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene, acrylonitrile, and the like.
[0042]
Further, as the functional group-containing monomer component, acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid and other carboxyl group-containing monomers, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, N -Hydroxyl group-containing monomers such as methylol acrylamide, acrylamide, methacrylamide, glycidyl methacrylate and the like.
[0043]
A crosslinking agent is added to a solution of these polymers or copolymers.
[0044]
Examples of the crosslinking agent include isocyanate-based, epoxy-based, ethyleneimine-based, and aluminum chelate-based crosslinking agents. A type of crosslinking agent capable of reacting with a functional group is selected and added.
[0045]
In the present invention, a tackifier having a softening point of 70 ° C. or higher is used as the tackifier contained in the pressure-sensitive adhesive of the recording medium. By adding such a tackifier to the pressure-sensitive adhesive, it is possible to more effectively prevent the tip of the recording medium from warping as described above. Acrylic cross-linking pressure-sensitive adhesives to which a relatively large amount of a cross-linking agent is added may increase viscosity and gel in some cases, and such gelation may not be preferable for forming a pressure-sensitive adhesive layer. In the present invention, the amount of the crosslinking agent added can be reduced by adding a tackifier having a softening point of 70 ° C. or more, and the tip can be effectively prevented from warping without causing gelation.
Specific examples of the tackifier include a rosin resin having a softening point of 70 ° C. or higher, a terpene phenol resin, a petroleum resin, and a cumarone resin.
The amount of the tackifier is preferably 5 to 50 parts by weight (solid content), more preferably 10 to 30 parts by weight (solid content), based on 100 parts by weight of the solid content of the acrylic copolymer. Solids).
[0046]
The coating amount of the adhesive is preferably in the range of 5 to 50 g / m ² (dry weight), more preferably about 10 to 30 g / m ² .
[0047]
According to a preferred embodiment of the present invention, the release sheet 13 is made of a high-quality, glassine-based paper as a sheet-like base material 13a, and optionally provided with a sealing layer 13b on the base material 13a. For example, a silicone layer 13c is applied thereon as a release agent in an application amount of 0.1 to 3 g / m ² .
[0048]
The filling layer 13b may be formed by laminating or applying polyethylene, polyvinyl alcohol, clay, alkyd resin, or the like in a thickness of 0.5 to 50 μm. These filling layers may be further provided on the back surface of the sheet-like base material 13a, which is the surface opposite to the release treatment surface, to prevent curling.
[0049]
In addition, as the release sheet 13, not only paper but also a film can be used, and a film obtained by applying a release agent silicone to a film such as a polyester film or polypropylene may be used.
[0050]
The release sheet 13 is preferably slightly larger than the recording sheet 11 and the adhesive layer 12 as shown in FIGS. 1 and 2 from the viewpoint of easy release of the release sheet 13.
[0051]
An ink permeation prevention layer may be provided between the above-described recording agent receiving layer 11b and the base material 11a or between the base material 11a and the adhesive layer 12. The ink penetration preventing layer is preferably made of a hydrophobic resin for the purpose of preventing the penetration of aqueous ink.
[0052]
Further, according to a preferred embodiment of the present invention, the release sheet itself preferably has a Gurley-type softness, preferably a Gurley-type softness in the transport direction of the printer, of about 20 to 600 mgf, Preferably, it is about 30 to 200 mgf.
[0053]
【Example】
Example 1
The ink receiving layer precursor composition is applied in an amount of 20 g / m ^{2 on} one side of high-quality paper having a basis weight of 100 g / m ² , and then dried, and a recording sheet (125 μm thick, Gurley-type softness 253 mgf) is dried. Obtained.
[0054]
After laminating a polyethylene film having a thickness of 17 μm on one side of a high-quality paper of 50 g / m ² , silicone is applied on the surface of the laminated film at a coating amount of 0.8 g / m ² and subjected to a release treatment for drying. Thus, a release paper was obtained.
[0055]
Next, "Coronate L" (isocyanate cross-linking agent) manufactured by Nippon Polyurethane Co., Ltd. was added as a cross-linking agent to an acrylate copolymer consisting of 97 parts by weight of butyl acrylate and 3 parts by weight of acrylic acid. 1.2 parts by weight (solids content) was added to 100 parts by weight of solids, and "Crystalex 3100" (a petroleum resin, softening point 100 ° C.) manufactured by Rika Hercules Co., Ltd. as a tackifier was added to the solid of the copolymer. 20 parts by weight (solid content) was added to 100 parts by weight per minute, followed by stirring. This mixture was applied to the release paper subjected to the release treatment so that the coating amount after drying was 20 g / m ^2, and dried. Thereafter, the recording sheet was attached to the surface of the recording sheet on which the ink receiving layer was not formed to obtain a recording medium.
[0056]
The Gurley-type softness of the recording medium thus obtained was 560 mgf.
[0057]
Example 2
The ratio of the acrylate copolymer and the amount of the crosslinking agent is 0.8 parts by weight with respect to 100 parts by weight, and the ratio of the acrylate ester copolymer and the tackifier is 10 parts by weight with respect to 100 parts by weight. A recording medium was obtained in the same manner as in Example 1 except that the recording was performed.
[0058]
Example 3
The ratio of the acrylate copolymer and the amount of the crosslinking agent was 0.8 parts by weight with respect to 100 parts by weight, and the ratio of the acrylate ester copolymer and the tackifier was 20 parts by weight with respect to 100 parts by weight. A recording medium was obtained in the same manner as in Example 1 except that the recording was performed.
[0059]
Example 4
The ratio of the acrylate ester copolymer and the amount of the crosslinking agent was 0.8 parts by weight with respect to 100 parts by weight, and “Ester gum 8L-JA” (Rosin ester, softening point 80, manufactured by Rika Hercules Co., Ltd.) as a tackifier. ° C), and a recording medium was obtained in the same manner as in Example 1 except that the ratio of the acrylic ester copolymer to the tackifier was 25 parts by weight with respect to 100 parts by weight.
[0060]
Comparative Example 1
A recording medium was obtained in the same manner as in Example 1, except that no tackifier was added and the ratio of the acrylate copolymer to the crosslinking agent was changed to 5.0 parts by weight with respect to 100 parts by weight.
[0061]
Comparative Example 2
A recording medium was obtained in the same manner as in Example 1, except that the tackifier was not added and the ratio of the acrylate ester copolymer and the amount of the crosslinking agent was 0.8 parts by weight with respect to 100 parts by weight.
Retention force test The recording media of Examples 1 to 4 and Comparative Examples 1 and 2 were subjected to a JIS-Z-0237 retention force test. When the recording medium dropped, the destruction state of the adhesive layer was observed.
[0062]
The test results were as shown in Table 1 below.
[0063]
Printer transport test The recording media of Examples 1 to 4 and Comparative Examples 1 and 2 were cut out to A4 size, loaded into an inkjet printer MJ-700V2C (manufactured by Seiko Epson Corporation), and transported. . The printer has a configuration substantially as shown in FIG. 3, in which the radius of the paper feed roller 1 is 16 mm and the central angle of the arc is 156 degrees. The distance from the sheet guide to the recording head is 2.5 mm. Immediately after the recording medium was sent out from the paper feed roller, the conveyance was stopped, and the height of the leading end of the stationary recording medium from the sheet guide, that is, floating due to warpage of the adhesive sheet (see h in FIG. 3) was measured. . At this time, the recording head was at the home position. Thereafter, the conveyance was restarted, and printing on the recording medium by the recording head was performed to output an image. At that time, the presence or absence of contact of the recording medium with the recording head was confirmed.
[0064]
The presence or absence of gelation A mixture having the same composition as the adhesive layers of the recording media of Examples 1 to 4 and Comparative Examples 1 and 2 was prepared, and the presence or absence of gelation after 3 hours was confirmed.
[0065]
The results were as shown in Table 1 below.
[0066]
[Table 1]

[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a recording medium according to the present invention.
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is a schematic diagram of a specific example of a printer including a recording head that performs recording in a non-contact state with a recording medium, and a unit that changes a transport direction of the recording medium in the printer.
FIG. 4 is a cross-sectional view illustrating a state in which the recording medium 10 is wound around a paper feed roller 1;
FIG. 5 is a partially enlarged view of the recording medium of FIG. 2;
FIG. 6 (a) shows a Gurley tester capable of measuring Gurley hardness, and FIG. 6 (b) shows a main part of the Gurley tester of FIG. 6 (a).
FIG. 7 is an automatic crimping apparatus used for a JIS-Z-0237 holding force test. (A) is an overall view of the apparatus, and (b) is a side view of a roller portion of (a). In the figure, reference numeral 71 denotes a roller, and the surface of the roller is covered with a rubber layer 72. Reference numeral 73 denotes a motor, and reference numeral 74 denotes a gear. This roller has a diameter d of about 83 mm and a width l of 45 mm. The thickness e of the rubber layer 72 is about 6 mm.
FIG. 8 is a manual crimping device used for a JIS-Z-0237 holding force test. In the figure, 81 is a roller, and 82 is a handle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Recording medium 11 Recording sheet 12 Adhesive layer 13 Release sheet 1 Paper feed rollers 2, 3, and 4 Pressure contact roller 5 Sheet guide 6 Recording heads 7a and 7b Discharge roller

Claims (8)

A recording sheet, a recording medium having a pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive formed on one surface of the recording sheet, and a release sheet provided on the pressure-sensitive adhesive layer,
A recording head that performs recording in a non-contact state with the recording medium, and a unit that changes the conveyance direction of the recording medium in the printer while drawing an arc, wherein the central angle of the arc is 120 to 200 degrees and the arc is Used for printers with a radius of 10 to 50 mm,
The pressure-sensitive adhesive is an acrylic cross-linking pressure-sensitive adhesive containing a tackifier having a softening point of 70 ° C. or higher, and in a JIS-Z-0237 holding force test, the time to drop is 100 minutes or more. A recording medium which breaks down at an interface between an adherend and an adhesive layer and falls when the time to fall is less than 100 minutes. If the time required for the pressure-sensitive adhesive sheet to fall in the JIS-Z-0237 retention force test is 100 minutes or more, the pressure-sensitive adhesive layer is broken and falls in the pressure-sensitive adhesive layer, or falls at the interface between the adherend and the pressure-sensitive adhesive layer and falls. 2. The recording medium according to claim 1, wherein the recording medium is used. The acrylic cross-linkable pressure-sensitive adhesive comprises a cross-linking agent selected from the group consisting of an isocyanate cross-linking agent, an epoxy cross-linking agent, an ethylene imine cross-linking agent, and an aluminum chelate cross-linking agent. 3. The recording medium according to 2. The recording medium according to claim 1, wherein the tackifier is selected from the group consisting of a rosin-based resin, a terpene-phenol-based resin, a petroleum-based resin, and a cumarone-based resin. The recording medium according to any one of claims 1 to 4, which is used for a printer in which a distance between the recording medium and a recording head is 1 mm to 5 mm. The recording medium according to claim 1, wherein the recording head is an inkjet recording head. A method for recording on a recording medium,
What is claimed is: 1. A printer comprising: a recording head that performs recording in a state of being in contact with a recording medium; A recording method comprising: introducing the recording medium according to claim 1 into a printer having a radius of the arc of 10 to 50 mm, and performing recording on the recording medium by the recording head. Method. The recording method according to claim 7, wherein the recording head is an inkjet recording head.

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