JP2005288882A - Inkjet recording postcard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording postcard, which has excellent inkjet recordability and fitness of postcard and, at the same time, can be a highly fine image quality same as that of a photography and further has expressional effects like an appreciative picture, the conveyability at inkjet printing of which is favorable and which is die-embossed without lowering its stiffness. <P>SOLUTION: In the inkjet recording postcard, in which an ink accepting layer is provided on a support and a die embossing is applied on the surface of the ink accepting layer, when the postcard is loaded in a printer together with another postcard under the condition being piled up for continuous printing, a relationship of 0.70 P≤S≤1.05 P is satisfied, wherein let S denote the static frictional coefficient of the addressing surface of another postcard contacting with the die-embossed surface of the ink accepting layer (the communicating surface) and let P denote the static frictional coefficient of the addressing surface of another postcard contacting with the non-die-embossed surface of the ink accepting layer. The ink accepting layer includes a pigment and a binder and has a center-surface mean roughness of 2-30 μm. The die embossing preferably has a mean wavelength of 50-2,000 μm. The stiffness lies preferably in the range of 280 mN×m to 400 mN×m. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a postcard for ink-jet recording. Specifically, it has excellent ink-jet recording suitability, a high-definition image quality equivalent to a photograph, and has an expression effect similar to a painting for appreciation. The present invention relates to a postcard for ink-jet recording which has good transportability and is molded without lowering the rigidity.

  In recent years, as ink jet recording systems have spread to the general public, they have been adopted for postcards (see, for example, Patent Documents 1 and 2).

  Usually, a postal code frame, a stamp pasting frame, or a lottery number of a New Year postcard with New Year's cards is printed on the address side of the postcard. Also, the address surface is required to be pen-written. Accordingly, the address side is required to have ink jet recording suitability, print suitability, and pen writing suitability.

  On the other hand, photographic paper has been conventionally used for postcards, but as the resolution of inkjet printers has increased, so-called photographic-like high-definition images can be obtained. A high-definition image similar to photographic printing paper is desired on the surface side.

  Furthermore, with the spread of inkjet recording systems to the general public, textures such as Japanese paper and artistic paper have been demanded, but to date there have been almost no proposals for postcards with such a unique texture. Thus, the texture and touch of a postcard or photo print were touched (see, for example, Patent Document 3).

  In addition, as a method for obtaining an ink jet recording paper having a unique texture, a method of applying a pattern by a dandy roll on a paper machine wire in advance on the surface of a base paper before providing an ink receiving layer, a press roll having a pattern It has been proposed to apply a concavo-convex pattern by any method selected from a method of applying a press mark in a wet paper state and a method of applying a embossed mark by treating dry paper with an embossed calendar (for example, patents) In this method, when the ink receiving layer is provided, uneven coating due to unevenness on the surface of the base paper occurs, and a uniform and high quality printed image cannot be obtained.

  Thus, in the conventional method, the function as an ink jet recording postcard, that is, ink jet recording suitability, printing suitability, pen writing suitability, etc., can be provided, and an expression effect like a painting for viewing such as a Japanese paper tone or an artistic paper tone can be provided. It was difficult.

As described above, there are a wide variety of characteristics required for postcards for inkjet recording, and the prior art has not been able to achieve both of these and the texture of paper for paper.
JP-A-9-143900 JP 2003-127528 A Japanese Patent Laid-Open No. 11-188966 Japanese Patent No. 3282761

  Therefore, the object of the present invention is excellent in ink jet recording suitability, postcard suitability, and high-definition image quality equivalent to that of photographs, and also has good transportability during ink jet printing and has been molded without reducing rigidity. The purpose is to provide a postcard for ink-jet recording that has an expression effect similar to a painting for viewing.

The above object of the present invention has been basically achieved by the following invention.
Ink-jet recording postcard in which an ink receiving layer is provided on a support and the surface of the ink receiving layer is molded, and the surface of the ink receiving layer formed when the ink receiving layer is loaded into a printer in a layer for continuous printing When the static friction coefficient with the address face of the other postcard in contact with the (communication surface) is S and the static friction coefficient with the address face of the other postcard in contact with the non-typed ink receiving layer is P, the following formula Postcard for inkjet recording that satisfies the relationship.

  It is preferable that the ink receiving layer contains a pigment and a binder, and the surface average roughness (SRa) of the surface of the ink receiving layer is 2 to 30 μm and the average wavelength is 50 to 2000 μm.

  The rigidity defined by JIS P8125 (2000) is preferably in the range of 280 mN · m to 400 mN · m.

  The postcard for ink jet recording of the present invention is excellent in ink jet recording suitability, postcard suitability, high-definition image quality equivalent to a photograph, and good transportability at the time of ink jet printing. It has an expression effect similar to a painting for a work.

The ink jet recording postcard of the present invention is produced by forming a coating layer on one side or both sides of a support and then molding the surface on the ink receiving layer side to be a communication surface.
The best mode for carrying out the present invention will be described in detail below.

  The degree of molding on the surface of the ink-receiving layer of the present invention is the coefficient of static friction with the other postcard addressing surface that comes into contact with the surface of the ink-receiving layer that has been typed when it is loaded into the printer in an overlapping manner for continuous printing. Where S is S, and P is the coefficient of static friction with other postcard addressing surfaces that are in contact with the surface of the ink receiving layer that is not typed, the relationship must satisfy the following formula (1).

  If the static friction coefficient S with the addressed surface of the other postcard that comes into contact with the surface of the typed ink receiving layer is less than 0.70P, the printer transport portion slips between the transport rollers and is not printed. The trouble that cannot be done occurs. In addition, when the static friction coefficient S exceeds 1.05P, so-called “double feeding” occurs in which two or more postcards are simultaneously conveyed. In the worst case, the printer head is even destroyed.

In the present invention, it is important that the surface shape and surface roughness of the ink receiving layer are in a specific range.
Since the surface of the ink receiving layer usually contains a short wavelength component (roughness) and a long wavelength component (swell) at the same time, in the present invention, in order to limit the surface shape of the typed ink receiving layer, It is necessary to measure by removing the swell component derived from the support. This removal is called “cut-off” and is defined in JIS B0601-1994.
In the present invention, since the support is often paper, the cut-off value is 0.8 mm. This is to limit the surface shape of the ink receiving layer by removing a specific wavelength component using the low-frequency cutoff value and the high-frequency cutoff value, and is a second quality of the object of the present invention. Used as an indicator.

  SRa of the present invention refers to the average roughness of the three-dimensional center plane, and a portion of the area SM is extracted on the center plane from the roughness curve, and the orthogonal coordinate axis, X axis, and Y axis are placed on the center plane of the extracted portion. The axis perpendicular to the center plane is represented by the Z axis, and the value obtained by the following equation is SRa.

  By using this SRa, it becomes an index indicating the printer transportability of the postcard.

  In the present invention, the SRa of the surface shape of the ink receiving layer is preferably 2 to 30 μm under a cutoff condition of 0.8 mm. If it is less than 2 μm, the molding is inconspicuous, the effect of the molding is reduced, and it is difficult to express a unique texture. On the other hand, if it exceeds 30 μm, the surface of the ink receiving layer becomes rough, the image reproducibility deteriorates, and it is difficult to obtain a uniform and high-quality printed image. More preferably, it is 4-20 micrometers.

  In the present invention, the average wavelength of the surface roughness of the ink receiving layer is not particularly limited as long as a desired pattern property is obtained as long as the ink jet recording property is not impaired. The range of 50-2000 micrometers is preferable from a viewpoint of conveyance property and recording property. If the average wavelength is less than 50 μm, it will be merely matt and the pattern due to embossing will not be noticeable. On the other hand, when the average wavelength exceeds 2000 μm, the surface becomes rough, and it is not different from mere bumps and waviness of the support, and the pattern by the embossing treatment tends to be invisible. More preferably, it is 80-1000 micrometers, More preferably, it is 100-500 micrometers.

  In the present invention, the other back surface of the postcard that comes into contact with the surface of the typed ink receiving layer that is loaded into the printer in order to perform continuous printing is preferably not typed or slightly typed. When slightly molded, the center surface average roughness (SRa) of the surface is 1 to 15 μm, and the roughness is preferably smaller than the communication surface. If it is less than 1 μm, when two or more postcards, postcards or sheets of the present invention are set in a stacked state, slips will occur between postcards or postcards and sheets, and postcards that should be conveyed will not be conveyed, A conveyance failure such as being taken in by the printer occurs. Further, if the thickness exceeds 15 μm, friction occurs between the back side of the postcard that contacts the surface of the ink receiving layer that has been molded, and two or more postcards or sheets are conveyed simultaneously. In the worst case, the printer head Even destroy it.

  Further, according to the present invention, since the desired patterning is performed after the ink receiving layer is provided on the support, the unevenness includes a portion where the ink receiving layer is deformed and a portion where the support is deformed. Deformation of the support, i.e. partial compression of the support, can reduce the stiffness of the ink jet recording postcard. Also, if a fine pattern is applied, the density may be increased and the rigidity may be extremely lowered.

  Therefore, in the present invention, it is important that the rigidity defined by JIS P8125 (2000) is in the range of 280 mN · m to 400 mN · m. If the stiffness is less than 280 mN · m, a trouble in conveyance occurs in the postal code reading automatic sorting machine or the like, and if it exceeds 400 mN · m, the ink is not conveyed by an ink jet printer or the like and printing cannot be performed.

  Natural pulp used for the base paper of the support of the present invention includes hardwood bleached sulfite pulp (LBSP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), softwood bleached kraft pulp (NBKP) and the like. It is advantageously used. In addition to wood pulp, non-wood pulp, synthetic pulp, synthetic fiber, or recycled pulp may be used as necessary.

  Pulp is usually beaten by a beating machine such as a double disc refiner in order to improve paper properties, such as paper properties such as strength, smoothness, and uniformity of formation.

  The beaten pulp slurry is made by a paper machine such as a long paper machine, a twin wire paper machine, or a round paper machine. At this time, various additives such as a dispersion aid, a dry paper strength enhancer, a filler, a sizing agent, and a fixing agent can be added as necessary. Furthermore, if necessary, pH adjusting agents, dyes, colored pigments, fluorescent brighteners, and the like can be added.

  In the present invention, the base paper made as described above is size-pressed with a size press liquid. The size press liquid preferably contains a binder such as starch or polyvinyl alcohol. 1-10 mass% is suitable for the content density | concentration of a binder.

Impregnation amount of the size press solution of the base paper is preferably in the range of 1 to 10 g / m ² on a solids, in particular in the range of 2 to 6 g / m ² is preferred.

  The size press is preferably performed continuously after the base paper is made with an on-machine device, and as a method of smearing in the size press process, a conventional size press, a gate roll size press, or a film transfer type size press is used. Can do.

  Although the ink receiving layer may be directly provided on the base paper (paper support) produced in this manner, a calendar process such as a machine calendar, a TG calendar, or a soft calendar is performed for the purpose of smoothing the base paper surface in advance. Is preferred.

  The present invention has an ink receiving layer mainly containing an inorganic pigment on one side of the paper support described above. Here, “mainly containing an inorganic pigment” means that the inorganic pigment is contained in an amount of 50% by mass or more, preferably 55 to 90% by mass, particularly 60% by mass, based on the total solid content of the ink receiving layer. It is preferable to contain -90 mass%. As described above, by providing the ink receiving layer mainly containing the inorganic pigment, the ink absorbability is increased, so that a photographic-like high-definition color image can be obtained when the surface is used as a communication surface.

Further, the ink receiving layer mainly containing the inorganic pigment described above has a relatively small coating amount (in the present invention, the coating amount means a dry coating amount), for example, 5 to 15 g / m ² , more preferably. Is preferable in terms of printing durability since the required ink absorption capacity can be obtained with a coating amount in the range of 6 to 13 g / m ² . That is, in the present invention, the surface having the ink receiving layer described above is used as a communication surface, and the opposite surface is used as a destination surface. When printing the ink, a large pressure is also applied to the ink receiving layer on the communication surface side, so printing resistance (for example, the ink receiving layer does not fall off) is required. This can be achieved by using a relatively small amount. Further, the printing durability is further improved by the combination with a binder described later, and it is possible to sufficiently cope with printing directly on the communication surface.

  The inorganic pigment used in the ink receiving layer preferably has an average secondary particle diameter of 1 to 10 μm. If necessary, two or more inorganic pigments having different particle diameters within the above-mentioned particle diameter range can be used in combination. Examples of inorganic pigments used in the ink receiving layer include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, Examples include aluminum silicate, diatomaceous earth, calcium silicate, synthetic silica, and magnesium hydroxide. Among these, porous pigments such as synthetic silica are preferably used.

  It is preferable to use a binder together with an inorganic pigment in the ink receiving layer. The content of the binder is preferably in the range of 5 to 50% by mass with respect to the inorganic pigment. Examples of binders include starch derivatives such as oxidized starch, etherified starch and phosphate esterified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, casein, gelatin, soybean protein, polyvinyl alcohol or derivatives thereof, polyvinyl pyrrolidone, and maleic anhydride. Acrylic polymers such as resins, styrene-butadiene copolymers, conjugated diene copolymer latexes such as methyl methacrylate-butadiene copolymers, and acrylic polymers such as acrylic ester or methacrylic ester polymers or copolymers Polymer emulsions, vinyl polymer emulsions such as ethylene vinyl acetate copolymers, or functional group-modified polymer emulsions with functional group-containing monomers such as carboxy groups of these various polymers, melamine Aqueous adhesives such as thermosetting resins such as fats and urea resins, polymers or copolymer resins of acrylic acid esters and methacrylic acid esters such as polymethyl methacrylate; polyurethane resins, unsaturated polyester resins, vinyl chloride-vinyl acetate Examples thereof include synthetic resin adhesives such as copolymers, polyvinyl butyral, and alkyd resins.

  Among the binders described above, polyvinyl alcohol is preferable, and among the polyvinyl alcohols, silanol-modified polyvinyl alcohol is particularly preferably used. By using silanol-modified polyvinyl alcohol as a binder, the printing resistance of the above-described communication surface (surface having an ink receiving layer) is further improved. In addition, the use of a polymer latex or a polymer emulsion as a binder for the ink receiving layer improves printing resistance. In particular, a combination of a silanol-modified polyvinyl alcohol and a polymer latex or an emulsion is used as a binder for the ink receiving layer. Printing resistance is further improved. In this case, the content ratio (P / L) of the silanol-modified polyvinyl alcohol (P) and the polymer latex or polymer emulsion (L) is preferably 1/3 to 6/1.

  The ink receiving layer preferably further contains a cationic polymer. By containing the cationic polymer, the ink bleeding can be further prevented by the synergistic effect with the paper support of the present invention, so that the sharpness of the printed image (particularly the color image) is improved. Examples of the cationic polymer include polymers having a primary to tertiary amine and a quaternary ammonium salt in the molecule. Specifically, polyalkylene polyamines such as polyethylene polyamine and polypropylene polyamine or derivatives thereof, and secondary amines. Tertiary amine, acrylic resin having quaternary ammonium salt, polyvinylamine, polyvinylamidine, dicyandication resin represented by dicyandiamide-formalin polycondensate, polyamine-based cation resin represented by dicyandiamide-diethylenetriamine polycondensate , Epichlorohydrin-dimethylamine addition polymer, dimethyldiallylammonium chloride polymer, diallylamine salt polymer, dimethyldiallylammonium chloride polymer, allylamine salt polymer, dialkylamine Ethyl (meth) acrylate quaternary salt polymer, acrylamide - diallylamine salt copolymers, polyvinyl alcohol - cationic monomer graft polymer and the like. The number average molecular weight of the cationic polymer used in the ink receiving layer is preferably from 3,000 to 200,000, and particularly preferably from 5,000 to 100,000.

  In the ink receiving layer, as additives, pigment dispersants, thickeners, fluidity improvers, antifoaming agents, antifoaming agents, mold release agents, foaming agents, penetrating agents, fluorescent whitening agents, ultraviolet absorbers, Antioxidants, preservatives, antifungal agents, water-proofing agents, and the like can be appropriately blended.

It is preferable not to provide a coating layer on the surface (addressed surface) opposite to the surface (communication surface) on which the ink receiving layer of the paper support is provided, but when the coating layer is provided, the coating amount is 2 g / m. ^It is preferably ² or less, and more preferably 1 g / m ² or less. As described above, the address surface is printed with a postal code frame, a stamp pasting frame, or the like, so that printability is required, and at the same time, pen writing aptitude and inkjet recording aptitude are required. Usually, a coating layer having ink jet recording aptitude is inferior in printability and pen writing aptitude, and conversely, a coating layer having print aptitude and pen writing aptitude is inferior in ink jet recording aptitude. Therefore, as described above, it is preferable that a coating layer is not provided on the address surface, or even if a coating layer is provided, fine coating is performed as described above. Note that the coating order does not affect the contents of the present invention regardless of whether the communication side is the first or the destination side is the first.

  When providing the coating layer of the above-mentioned fine coating amount on the address surface, for example, a coating layer containing a surface sizing agent can be provided for the purpose of improving pen writing properties. This further prevents ink bleeding when writing with a pen. The coating layer containing the surface sizing agent preferably contains a binder such as starch, polyvinyl alcohol, or a cellulose derivative. Surface sizing agents include styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, acrylonitrile-vinyl formal-acrylic acid ester copolymers, styrene-maleic acid copolymers, olefin-maleic acid copolymers. Examples thereof include polymers and alkyl ketene dimer (AKD) type surface sizing agents. Preferred are styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, and styrene-maleic acid copolymers.

  In the present invention, after each coating layer is provided, the object can be achieved even if the ink receiving layer surface is molded as it is, but for the purpose of smoothing the coated paper surface in advance after providing each coating layer. It is preferable to perform calendar processing using a machine calendar, a TG calendar, a soft calendar, a super calendar, or the like.

In the present invention, a method of embossing the surface of the ink receiving layer is a typical example, but there is no particular limitation.
In the process using the embossing calendar, the degree of molding on the surface of the ink receiving layer is controlled by the processing temperature and the processing speed, and therefore, the processing speed and the processing temperature can be selected according to the preferable degree of molding. For example, a plain metal roll may be applied to the address surface, and an emboss roll may be applied to the communication surface.
The SRa and the average wavelength of the embossed calender roll surface are not particularly limited as long as the center surface average roughness (SRa) of the ink receiving layer after the molding process is 2 to 30 μm and the average wavelength is 50 to 2000 μm. An embossed calender roll having a surface of about 1 to 25 μm and an average wavelength of about 30 to 1700 μm is appropriately selected. In addition, the shape of each protrusion after embossing is preferably a protrusion having an aspect such as a bowl without corners. If there is a corner, double feeding is likely to occur during printer conveyance, which is not preferable.

  Examples of the present invention will be described below, but the present invention is not limited to these examples. Further, “parts” and “%” indicate parts by mass and mass% unless otherwise specified. In addition, the number of parts shown in the blend is the number of substantial components.

(Example 1)
<Preparation of paper support>
To 100 parts of wood pulp consisting of 80 parts of LBKP (freeness 450 mlcsf) and 20 parts NBKP (freeness 440 mlcsf), 8 parts of talc, 0.5 parts of commercially available rosin sizing agent, 0. After preparing a slurry of 8 parts and 2.0 parts of a sulfuric acid band, after making paper with a long paper machine to a basis weight of 180 g / m ² and drying, the following size press solution using an on-machine size press machine Was wet-pressed at 30 g / m ² size and calendered for smoothing.

<Size press liquid>
Concentration in size press liquid Starch 6%

Next, the following ink receiving layer was provided on one side of the paper support at a coating amount of 9 g / m ² .

<Ink receiving layer>
Caustic soda 1 part Inorganic pigment (synthetic amorphous silica having an average particle size of 6 μm) 100 parts Silanol-modified polyvinyl alcohol 20 parts Ethylene-vinyl acetate emulsion 25 parts Cationic polymer 30 parts

Next, the following fine coating layer was provided on the opposite surface of the ink receiving layer at a coating amount of 0.5 g / m ² .

<Fine coating layer>
Surface sizing agent (styrene acrylic resin) 1.3 parts Starch 3.0 parts

After providing each of the coating layers, calendaring was performed for the purpose of smoothing the surface. The stiffness at this stage was 400 mN · m. Next, the embossing calender roll shown in Table 1 was used to mold the surface of the ink receiving layer, and a sample for ink jet recording postcard of Example 1 was obtained.
Hereinafter, in Examples 2 to 5 and Comparative Examples 1 to 3, samples were obtained in exactly the same manner as in Example 1 except that the embossing roll shape of the embossing calendar in Example 1 was changed as shown in Table 1. .

  The various samples prepared as described above were measured for the coefficient of static friction S, the average roughness of the center surface of the ink receiving layer, and the average wavelength as follows, and the results are shown in Table 1.

  In addition, printer transportability, image reproducibility of the surface having the ink receiving layer (communication surface), and sharpness of the molding by embossing were evaluated as follows, and the results are shown in Table 2.

<Measurement of static friction coefficient S>
The static friction coefficients P and S are both measured so that the ink receiving layer side of the sample on the plastic plate and the address surface of the sample on the thread metal are in contact with the plastic plate and the thread metal using a friction coefficient measuring device manufactured by Tester Sangyo Co., Ltd. Attach each, move the plastic plate at a speed of 1000 mm / min, measure the static friction force A (g weight) at that time, calculate the A / B with the thread metal weight B (g weight), P and S.

<Measurement of center plane average roughness (SRa) and average wavelength>
For the measurement of SRa, a surface roughness analyzer Surfcom 570A manufactured by Tokyo Seimitsu Co., Ltd. was used.

<Evaluation of printer transportability>
Forty ink jet recording postcards of the present invention are set in an ink jet printer (Canon PIXUS950i; using water-based dye ink), and a black single-color thin line is recorded over the entire width at 10 mm from the end of the postcard. The distance from the end of each postcard to the thin line was measured with a magnifying glass with a scale, and judged according to the following criteria.
A: The distance between the end of the postcard and the thin line is ± 0.5 mm or less on the side with the large deviation between the left and right sides.
B: The distance between the end of the postcard and the thin line exceeds ± 0.5 mm on the left and right sides of the side where the deviation is large.
C: The postcard slips and does not carry, or simultaneously feeds two or more sheets.

<Image reproducibility>
Print “N8 (candle)” of high-definition color digital standard image data issued by the Japanese Standards Association on the inkjet recording postcard of the present invention with an inkjet printer (PIXUS950i from Canon Inc .; using aqueous dye ink). The image reproducibility was visually evaluated and judged according to the following criteria.
A: There is no unnatural feeling in the whole image, there is a three-dimensional effect, and the effect of the typing is also known.
B: Although there is no unnatural feeling in the entire image, the unevenness of the molding is somewhat conspicuous.
C: The image is unnatural, the density of printing at the convex and concave portions occurs, and the image is not reproduced.

<Shaping clarity by embossing>
Each sample was visually evaluated for the sharpness of the molding, and judged according to the following criteria.
A: Extremely good B: Excellent C: Normal D: Unclear because the mold collapses

  As can be seen from the above results, the sample of the example is excellent in ink jet recording suitability, has a high-definition image quality similar to a photograph, and has an expression effect similar to a painting for appreciation, and transportability during ink jet printing. A postcard for ink jet recording which is good and is molded without reducing the rigidity is obtained. On the other hand, the sample of the comparative example is inferior in the expression effect like a painting for viewing, and has poor transportability during ink jet printing.

Claims (3)

An ink-jet recording postcard in which an ink-receiving layer is provided on a support and the surface of the ink-receiving layer is typed. When the ink-receiving layer is loaded into a printer in a layer for continuous printing, the typed ink-receiving layer The coefficient of static friction with the addressed surface of the other postcard in contact with the surface (communication surface) is S, and the coefficient of static friction with the addressed surface of the other postcard in contact with the non-typed ink receiving layer surface (communication surface) is P. Inkjet recording postcards that satisfy the following mathematical formula.

  2. The ink jet recording layer according to claim 1, wherein the ink receiving layer comprises a pigment and a binder, and the surface average roughness (SRa) of the surface of the ink receiving layer is 2 to 30 [mu] m and the average wavelength is 50 to 2000 [mu] m. Postcard.   The postcard for ink-jet recording according to claim 1 or 2, wherein the rigidity defined by JIS P8125 (2000) is in the range of 280 mN · m to 400 mN · m.