JP2008137270A - Inkjet recording material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress generation of a flaw, fluctuation of gloss, deviation of winding and a crack. <P>SOLUTION: In a coating/drying process 30, an ink receiving layer 14 and a colloidal silica layer 16 are formed on a substrate 12 to form a raw web 36 of recording paper. In a first winding process 34, the raw web 36 of the recording paper is wound into a roll-like shape to form a raw web roll 38. In a raw web roll storing process 26, the raw web roll 38 is stored for 5-80 days at a storing temperature higher than the winding temperature. Shrinkages of both layers 14 and 16 are suppressed, and both layers 14 and 16 are cured. In a cutting process 42, the raw web 36 of the recording paper sent out from the raw web roll 38 is cut into a width of a product to form the recording paper 10. In a second winding process 44, the recording paper 10 is wound into a roll-like shape to form a product roll 20. Generation of the flaw, the fluctuation of gloss, the deviation of winding caused by shrinkage of both layers 14 and 16 is suppressed. By curing both layers 14 and 16, generation of the flaw, the fluctuation of gloss and cracks on side end part of the recording paper caused by cutting is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ink jet recording material for ink jet printing supplied in a roll form and a method for producing the same.

  An ink jet printer (hereinafter simply referred to as a printer) that includes an ink discharge type recording head, ejects ink as droplets from the recording head, and attaches the ink onto an ink jet recording paper (hereinafter simply referred to as recording paper) to print an image. ) This printer is widely used for reasons such as low noise during printing, easy full colorization, and high-speed printing.

  With recent development of high definition and high speed printers, advanced characteristics have been demanded for recording paper used in printers. Specifically, in addition to being excellent in ink absorption and water resistance, the recording paper is particularly required to have high glossiness in order to make the recorded image closer to a photographic image.

  Glossy recording paper that satisfies the above-mentioned requirements is composed of a support, an ink receiving layer mainly composed of inorganic fine particles such as vapor-phase-process silica, and a layer containing colloidal silica and a cationic compound (referred to as colloidal silica layer). There are many things. The colloidal silica layer is provided on the uppermost layer of the glossy recording paper. By appropriately adjusting the particle size of the colloidal silica contained in the colloidal silica layer, a glossy recording paper having high glossiness is produced. .

  By using the above glossy recording paper, a printer can obtain a print image close to photographic quality. For this reason, printers are installed in station shops, convenience stores, etc., and printing services are performed. In this case, a roll-type glossy recording sheet (hereinafter referred to as “roll-type glossy recording sheet”) is used instead of a normal printer that uses a sheet-type glossy recording sheet for the purpose of saving the trouble of setting the glossy recording sheet in the printer each time printing is performed. A printer exclusively for roll recording paper using a product roll) is preferably used.

  The product roll consists of a coating / drying process in which an ink-receiving layer and a colloidal silica layer are coated and dried on a support to form a recording paper original fabric, and the recording paper original fabric is wound into a roll and the original roll is A forming roll, a forming roll, a cutting process for cutting the recording paper fed from the roll into a glossy recording paper having a product width, and a product roll by winding the glossy recording paper into a roll. It forms through a roll formation process.

  However, in the above-described raw roll forming process, when the winding tension at the time of winding the recording paper original is high, colloidal silica is used when the support shrinks due to temperature change during storage of the raw roll. The surface of the layer and the back surface of the original recording paper in contact therewith may rub against each other and scratches or uneven gloss may occur on the surface of the colloidal silica layer. On the other hand, when the winding tension is low, there is a possibility that the roll of the original roll is misaligned.

  Therefore, in the above-described original roll forming process, the winding tension at the time of winding the recording paper original is appropriately adjusted to suppress the occurrence of scratches, gloss unevenness, winding misalignment, etc. (Patent Document 1). reference). Further, in order to suppress the occurrence of winding deviation, in particular, when the recording paper original is wound around the core, the recording paper original or the core is traversed at a predetermined cycle and amplitude, thereby preventing the occurrence of winding deviation. A method for producing an anti-roll is also known (see Patent Document 2).

  Further, the glossy recording paper delivered from the product roll has a drawback of curling because it has curl. As a result, there is a problem that the photographic print printed by the roll recording paper dedicated printer is curled, resulting in a poor appearance.

Therefore, the raw roll formed in the raw roll forming step is heated for 24 hours or more in an atmosphere having a temperature of 30 ° C. or higher. And the method of suppressing the curl of glossy recording paper is also known by forming the product roll by sending the cutting process and the product roll forming process to the heated fabric roll (see Patent Document 3). .
JP 2002-284405 A Japanese Patent Laid-Open No. 10-212059 JP 2006-247799 A

  By the way, when storing until the above-mentioned original fabric roll is put into the cutting process, if the storage temperature is lower than the temperature at the time of winding, the support is contracted in addition to the contraction as described in Patent Document 1 above. The ink image receiving layer and the colloidal silica layer on the body also shrink. Since the surface (colloidal silica layer) of the original recording paper has high gloss and is formed smoothly, it easily slips against the back surface of the original recording paper. For this reason, when both layers shrink, there exists a possibility that winding shift may occur.

  Further, when both layers contract, the surface of the colloidal silica layer and the back surface of the original recording paper may be rubbed to cause scratches and uneven gloss on the surface of the colloidal silica layer. Since the colloidal silica layer has high gloss as described above, there is a problem that scratches are easily noticeable. The occurrence of scratches and uneven gloss due to the shrinkage of the ink image-receiving layer and colloidal silica layer cannot be suppressed by the methods described in Patent Documents 1 and 2.

  In addition, if the ink image-receiving layer and the colloidal silica layer are not sufficiently cured, there is a risk that cracks may occur at the side edges of the glossy recording paper during the above-described cutting process. Furthermore, if the two layers are not sufficiently cured, there is a risk that a so-called crease in which the ink image receiving layer and the colloidal silica layer crack when the glossy recording paper (printed photograph) is bent may occur.

  Further, in the method described in Patent Document 3, although it is described that the raw roll is stored at a predetermined temperature or higher for a certain period for the purpose of curling the glossy recording paper, scratches, uneven gloss, cracks, etc. Since no preventive measures are taken into account, scratches, uneven gloss, cracks, etc. may still occur.

  The present invention is for solving the above-mentioned problems, and includes a roll-type ink jet recording material in which the above-described scratches, gloss unevenness, winding misalignment, cracks at the time of cutting, cracking, and the like are suppressed, and a method for producing the same. The purpose is to provide.

  The present invention rolls a recording material body in which an ink receiving layer mainly containing at least one layer of inorganic fine particles and a layer containing colloidal silica and a cationic compound are sequentially or simultaneously coated on a support. In the method for producing an inkjet recording material in the form, a raw roll forming step of winding the recording material main body into a roll form to form a raw roll, and a temperature higher than the temperature at the time of winding the recording material main body A raw roll storing step of storing the raw roll within 5 days to 80 days, and cutting the recording material main body fed from the raw roll after passing through the raw roll storing step, and winding it into a roll form A product roll forming step of forming a product roll.

  In the product roll forming step, it is preferable to form the product roll that satisfies D / W> 1.5, where W is a width of the product roll and D is a winding outer diameter. Moreover, it is preferable that the temperature difference of the preservation | save temperature in the said original fabric roll preservation | save process and the winding temperature in the said original fabric roll formation process is 5 degreeC or more.

  It is preferable to adjust the moisture content of the recording material body so that the moisture content of the recording material body is 2.5% to 5.0%.

  Further, the present invention winds up a recording material body in which an ink receiving layer mainly containing at least one layer of inorganic fine particles and a layer containing colloidal silica and a cationic compound are sequentially or simultaneously applied on a support. In the ink jet recording material in a roll form, the recording material body is wound into a roll form to form an original roll, and the original roll is held at a temperature higher than the temperature at the time of forming the original roll for 5 days or more 80 It is stored within a day, and the recording material body fed from the original roll after the storage is cut into a product roll wound into a roll form.

  In the present invention, an original roll obtained by winding a recording material main body into a roll form is stored at a temperature higher than the winding temperature within 5 to 80 days, and then cut and wound into a product roll. As a result, it is possible to suppress the occurrence of scratches, gloss unevenness, and winding deviation due to shrinkage of the ink receiving layer formed on the support of the recording material main body and the layer containing colloidal silica and a cationic compound. . In addition, since both layers are sufficiently cured, the occurrence of cracks at the side edges of the inkjet recording material due to scratches, uneven gloss, and cutting can be suppressed. In addition, when the ink jet recording material is bent, the occurrence of so-called breakage, in which both layers crack, is suppressed. Moreover, since the preservation | save days are made into 80 days or less, the deterioration of the gloss nonuniformity resulting from preserve | saving for a long time in the state which heated the original fabric roll is suppressed.

  In addition, when the width of the product roll is W and the outer diameter of the winding is D, conventionally, winding deviation, scratches, uneven gloss, and the like have deteriorated as D / W increases. Can be suppressed. Thereby, the product roll which satisfy | fills D / W> 1.5 can be manufactured. In other words, since the outer diameter of the roll of the product roll can be increased, the frequency of replacement of the product roll at the time of printing can be made lower than before.

  Further, by setting the moisture content of the recording material body to 2.5% or more and 5.0% or less, it is possible to further suppress the occurrence of scratches, uneven gloss, cracks at the side edges of the recording material, and the like.

  In addition, since cutting is performed by removing 5 mm or more from both ends of the recording material main body as ears at the time of forming the product roll, cracks or the like of the side end of the inkjet recording material (end of the film surface on the outer periphery of the product roll) Occurrence can be further suppressed.

  As shown in FIG. 1, an ink jet recording paper (hereinafter simply referred to as recording paper) 10 includes a support 12, and an ink receiving layer 14 and a colloidal silica layer 16 provided on the upper layer of the support 12.

  As the support 12, a polyester resin such as polyethylene terephthalate, a diacetate resin, a triacetate resin, an acrylic resin, a polycarbonate resin, a polyvinyl chloride, a polyimide resin, a cellophane, a cellulosic plastic resin film, and a paper and a resin film are bonded together. In addition, a water-resistant support such as a polyolefin resin-coated paper in which a hydrophobic resin such as a polyolefin resin is laminated on at least one side of the paper is used, and among these, a polyolefin resin-coated paper such as a resin-coated paper is particularly preferably used.

  The support 12 (polyolefin resin-coated paper) includes a base paper 12a and polyolefin resin layers 12b and 12c formed on the front and back surfaces of the base paper 12a. The base paper 12a is not particularly limited, and a commonly used paper can be used. However, a smooth base paper used for a photographic support is more preferable. As the pulp constituting the base paper 12a, for example, natural pulp, recycled pulp, synthetic pulp or the like is used alone or in combination. The base paper 12a may contain additives such as a sizing agent, a paper strength enhancer, a filler, an antistatic agent, a fluorescent brightening agent, and a dye that are generally used in papermaking. Further, a surface sizing agent, a surface paper strength agent, a fluorescent brightening agent, an antistatic agent, a dye, an anchor agent, or the like may be applied on the surface of the base paper 12a.

  The polyolefin resin layers 12b and 12c are, for example, homopolymers of olefins such as low density polyethylene, high density polyethylene, polypropylene, polybutene, and polypentene, and copolymers of two or more olefins such as ethylene-propylene copolymers. Is formed. In the polyolefin resin layer 12b, various additives such as white pigments, fatty acid metal salts, pigments and dyes, fluorescent brighteners, and ultraviolet absorbers may be added in appropriate combinations.

  The above-described support 12 is manufactured by a so-called extrusion coating method in which a polyolefin resin is cast on a base paper 12a while being heated and melted. Here, before the polyolefin resin is coated on both surfaces of the base paper 12a, it is preferable to subject the base paper 12a to activation treatment such as corona discharge treatment and flame treatment. The thickness of the polyolefin resin layers 12b and 12c is not particularly limited, but is generally 5 to 50 μm. In this embodiment, both sides of the base paper 12a are covered with the polyolefin resin layers 12b and 12c, but only one side may be covered.

Although not shown, an undercoat layer may be provided on the upper surface of the support 12. This undercoat layer is applied and dried in advance on the surface of the support 12 before the ink receiving layer 14 is formed. The undercoat layer mainly contains a water-soluble polymer or polymer latex that can form a film. Preferred are water-soluble polymers such as gelatin, polyvinyl alcohol, polyvinyl pyrrolidone and water-soluble cellulose, and particularly preferred is gelatin. 10-500 mg / m < ² > is preferable and the adhesion amount of these water-soluble polymers has more preferable 20-300 mg / m < ² >. Further, the undercoat layer preferably contains a surfactant and a hardener. Further, before applying the undercoat layer to the support 12, it is preferable to subject the support surface to a corona discharge treatment.

  At least one ink receiving layer (also referred to as an ink absorbing layer or an ink image receiving layer) 14 is provided on the support 12. In this embodiment, the ink receiving layer 14 is one layer, and the thickness t1 is about 35 μm. The ink receiving layer 14 mainly contains inorganic fine particles. As the inorganic fine particles, gas phase method silica, alumina, alumina hydrate, or the like is preferably used. In this embodiment, gas phase method silica 14a is used.

The vapor phase silica 14a is generally made by a flame hydrolysis method. Specifically, it is made by burning silicon tetrachloride with hydrogen and oxygen. The vapor phase silica 14a is contained in an amount of at least 50% by mass, preferably 60% by mass or more, and more preferably 65% by mass or more based on the total solid content constituting the ink receiving layer 14. Further, the total amount of fumed silica 14a contained in the ink receiving layer 14 is not particularly limited, but is preferably 10 to 50 g / m ^2, the range of 15 to 40 g / m ² is more preferable. Further, the average particle diameter of the vapor phase silica 14a is not particularly limited, but is preferably about 5 to 50 nm.

  The ink receiving layer 14 contains an organic binder (binder). As this organic binder, for example, various water-soluble polymers are used. As the water-soluble polymer, for example, polyvinyl alcohol, polyethylene glycol, starch, dextrin, carboxymethyl cellulose, polyvinyl pyrrolidone, polyacrylic acid ester and the like are used, and particularly preferable is completely or partially saponified polyvinyl. Alcohol or cation-modified polyvinyl alcohol is used. A polymer latex may be used instead of these water-soluble polymers.

  As described above, when the ink-receiving layer 14 contains the vapor phase silica 14a as the inorganic fine particles, it is preferable to contain a cationic compound together. By containing this cationic compound, the ink receiving layer 14 can be prevented from cracking and the water resistance can be improved. Further, by providing a colloidal silica layer (a layer containing colloidal silica and a cationic compound) 16 described later on the ink receiving layer 14 containing a cationic compound, the scratch resistance, water resistance, and ink absorption are further improved. improves. As such a cationic compound, a cationic polymer or a water-soluble polyvalent metal compound is preferably used.

  Examples of the cationic polymer include water-soluble cationic polymers having a quaternary ammonium group, a phosphonium group, or an acid adduct of a primary to tertiary amine. For example, polyethylenimine, polydialkyldiallylamine, polyallylamine, alkylamine epichlorohydrin polycondensate and the like.

  Water-soluble polyvalent metal compounds include calcium acetate, calcium chloride, calcium formate, calcium sulfate, barium acetate, barium sulfate, barium phosphate, manganese chloride, manganese acetate, manganese formate dihydrate, manganese ammonium sulfate hexahydrate , Cupric chloride, ammonium copper (II) chloride dihydrate, copper sulfate, cobalt chloride, cobalt thiocyanate, cobalt sulfate, nickel sulfate hexahydrate, nickel chloride hexahydrate, nickel acetate tetrahydrate , Nickel ammonium sulfate hexahydrate, nickel amidosulfate tetrahydrate, aluminum sulfate, aluminum sulfite, aluminum thiosulfate, polyaluminum chloride, aluminum nitrate nonahydrate, aluminum chloride hexahydrate, first bromide Iron, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, zinc bromide, chloride Lead, zinc nitrate hexahydrate, zinc sulfate, zirconium acetate, zirconium nitrate, basic zirconium carbonate, zirconium hydroxide, zirconium carbonate / ammonium, zirconium carbonate / potassium, zirconium sulfate, zirconium fluoride, zirconium chloride, zirconium chloride Hydrates, zirconium oxychloride, zirconium zirconium chloride, titanium chloride, titanium sulfate, chromium acetate, chromium sulfate, magnesium sulfate, magnesium chloride hexahydrate, magnesium citrate nonahydrate, sodium phosphotungstate, sodium citrate Examples thereof include tungsten, 12 tungstophosphoric acid n-hydrate, 12 tungstosilicic acid 26 hydrate, molybdenum chloride, 12 molybdophosphoric acid n-hydrate, and basic polyaluminum hydroxide compound.

  In addition to the inorganic fine particles (gas phase method silica 14a), the organic binder, and the cationic compound, the ink receiving layer 14 includes a hardening agent, a coloring dye, a coloring pigment, an ink dye fixing agent, an ultraviolet absorber, and an antioxidant. Various known additives such as an agent, a pigment dispersant, an antifoaming agent, a leveling agent, an antiseptic, a fluorescent brightening agent, a viscosity stabilizer, and a pH adjusting agent may be added as necessary.

  The ink receiving layer 14 is prepared by dissolving or dispersing each component such as inorganic fine particles (gas phase method silica 14a), an organic binder, and a cationic compound in various solvents to prepare an ink receiving layer coating solution. It is formed by applying a coating solution on the support 12 and drying it.

  The colloidal silica layer 16 is provided in the upper layer of the ink receiving layer 14 and is a layer containing colloidal silica 16a and a cationic compound. The colloidal silica layer 16 is preferably provided on the uppermost layer of the recording paper 10, and the thickness t2 in this embodiment is about 0.1 μm.

  Colloidal silica 16a is obtained by dispersing silica dioxide obtained by heating and aging silica sol obtained through metathesis by an acid of sodium silicate or the like through an ion exchange resin layer in a colloidal form and having an average particle diameter of several nm. Synthetic silica of about ~ 100 nm.

The total amount of colloidal silica 16a contained in the colloidal silica layer 16 is not particularly limited, but is preferably 0.1~8.0g / m ^2, and more preferably in a range of from 0.3 to 5.0 g / m ² . Thereby, the gloss and scratch resistance can be further improved without lowering the ink absorbability.

  As the cationic compound contained in the colloidal silica layer 16, a cationic polymer or a water-soluble polyvalent metal compound is preferably used. The details of the cationic polymer and the water-soluble polyvalent metal compound are the same as those described for the ink receiving layer 14 described above. And although the addition amount of a cationic compound is not specifically limited, 0.1-10 mass% is preferable with respect to the colloidal silica 16a, Furthermore, the range of 0.5-8.0 mass% is more preferable.

  The colloidal silica layer 16 contains the organic binder described in the above ink-receiving layer 14, for example, a complete or partially saponified polyvinyl alcohol or a cation-modified polyvinyl alcohol. This organic binder is preferably used in the range of 1 to 7% by mass relative to the colloidal silica 16a. Further, the colloidal silica layer 16 includes a hardening agent, a surfactant, a coloring dye, a coloring pigment, an ultraviolet absorber, an antioxidant, and a pigment dispersing agent in addition to the above-described colloidal silica, a cationic compound, and an organic binder. , Antifoaming agents, leveling agents, preservatives, optical brighteners, viscosity stabilizers, pH adjusting agents and the like may be contained.

  Similarly to the ink receiving layer 14, the colloidal silica layer 16 is prepared by dissolving or dispersing each constituent component such as colloidal silica 16a, a cationic compound, and an organic binder in various solvents to form a coating liquid for the colloidal silica layer. It is formed by applying a coating liquid for colloidal silica layer onto the ink receiving layer 14 and drying it. Thus, the recording paper 10 having high gloss can be obtained by forming the colloidal silica layer 16 smoothly on the ink receiving layer 14.

  The recording paper 10 composed of the support 12, the ink receiver 14, and the colloidal silica layer 16 is manufactured in a roll form because it is used in the above-described printer for roll recording paper. Hereinafter, a product roll manufacturing process 22 for manufacturing the recording paper 10 (hereinafter referred to as a product roll 20) in the roll form of the present invention will be described with reference to FIG. The product roll manufacturing process 22 is roughly divided into an original roll forming process 24, an original roll storing process 26, and a product roll forming process 28.

  The raw roll forming process 24 includes an application / drying process 30, a first winding process 34, and a humidity control process 35. In the coating / drying step 30, the ink receiving layer 14 and the colloidal silica layer coating liquid described above are coated on the wide support 12 and dried, so that the ink receiving layer 14 and the coating 12 are formed on the support 12. The colloidal silica layer 16 is formed.

  In the coating / drying step 30, as a method of applying the ink receiving layer coating liquid and the colloidal silica layer coating liquid, a sequential coating method in which the ink receiving layer coating liquid is applied and dried and then the colloidal silica layer coating liquid is applied. A simultaneous multilayer coating method in which both coating liquids are coated at the same time can be used. In the sequential coating method, various coating devices such as a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, and a reverse coater are used. In the simultaneous multilayer coating method, a slide bead coater, a slide curtain coater, or the like can be used.

  The ink receiving layer 14 and the colloidal silica layer 16 are formed on the support 12 by drying the ink receiving layer coating liquid and the colloidal silica layer coating liquid applied on the support 12. Thereby, a wide recording paper original 36 corresponding to the recording material body of the present invention is formed.

  The recording paper original 36 is wound into a roll in the first winding step 34 to become an original roll 38. In the first winding step 34, for example, various winding devices such as a turret type winding device are used. In the first winding step 34, as described above, the winding tension is suppressed in order to suppress the occurrence of scratches, uneven gloss, winding misalignment and the like due to the level of the winding tension when the recording paper original 36 is wound. The recording paper stock 36 is taken up while adjusting properly. In addition, the temperature at the time of the 1st winding process 34 is adjusted to 20 to 25 degreeC in this embodiment.

  In the original roll forming step 34, the moisture content of the recording paper original 36 wound around the original roll 38 is set to 2.5% to 5.0%. Hereinafter, a method for obtaining the moisture content of the original recording paper 36 in the present embodiment will be specifically described.

  First, the original recording paper 36 is cut to prepare a sample having a size of 15 cm (flow direction) × 14.5 cm (width direction). Then, the weight G1 of the sample is measured using an electronic balance (AEL-60 / AEL-160: manufactured by Mettler).

  After the weight measurement, the sample is cut into three equal parts in the width direction using a photographic cutter. And each cut body is peeled between the polyolefin resin layer 12b and the base paper 12a, and the formed six sheet bodies are wound in a stacked state to form a roll body. At this time, each sheet body is wound so that the polyolefin resin layer side is inside. The roll body is placed in a weighing bottle.

  The weighing bottle is set in a dry oven with the lid open and dried at 105 ° C. for 2 hours. When drying is complete, the lid of the weighing bottle is closed, and then the weighing bottle is placed in a desiccator. Then, the weighing bottle is left in the desiccator until the temperature reaches room temperature.

  Next, the weight of the weighing bottle with the roll body (sample) is measured with an electronic balance. Then, the roll body (sample) in the weighing bottle is discarded and the weight of only the weighing bottle is obtained. By obtaining the difference between the two weights, the weight G2 after the sample is dried is obtained.

  The moisture content A (%) of the original recording paper 36 is obtained by A = G2 ÷ G1 × 100.

  As will be described in detail later, if the water content of the recording paper original fabric 36 is 2.5% or more, the ink image-receiving layer 14 and the colloidal silica layer 16 are sufficiently cured, and the recording paper side edge due to scratches, uneven gloss, and cutting. Cracks in parts are less likely to occur. Further, when the moisture content of the original recording paper 36 is 5.0% or less, the layers 14 and 16 are not easily softened, and scratches and uneven gloss are hardly generated. For this reason, in this embodiment, by adjusting the moisture content of the recording paper original fabric 36 to 2.5% or more and 5.0% or less, generation of scratches, uneven gloss, cracks on the side edge of the recording paper due to cutting, etc. (See Table 6 below).

  In the present embodiment, a humidity control step 35 is provided after the coating / drying step 30 in order to adjust the moisture content. In the humidity adjusting step 35, the moisture content of the recording paper original fabric 36, that is, the moisture content was adjusted by applying a conditioned air to the recording paper original fabric 36 at a wind speed of 2 to 3 m / s for about 2 minutes. In order to keep the moisture content at 4 to 7%, it is preferable that the temperature of the humidity control air is 20 ° C. to 30 ° C., the humidity is 40% to 75%, and the wind speed is 1 m / s to 10 m / s for 1 minute or more.

  The original fabric roll 38 is stored in the original fabric roll storing step 26 until it is put into a product roll forming step 28 described later. As the original fabric roll storing step 26, various storage devices (storage) capable of storing the original fabric roll 38 in a constant temperature and humidity environment are used. In the raw roll storing step 26, the raw roll 38 is stored at a storage temperature higher than the winding temperature in the first winding step 34 for 5 days or more and 80 days or less.

  As described above, the ink receiving layer 14 and the colloidal silica layer 16 contract when the storage temperature falls below the winding temperature in the first winding step 34, and therefore, winding misalignment, scratches, gloss unevenness, etc. occur. (See Tables 2 and 3 below). For this reason, in this embodiment, the two layers 14 and 16 are stored by storing at a storage temperature higher than the winding temperature of the recording paper original fabric 36 described above, specifically at 25 ° C. or more, more preferably 30 ° C. or more. The shrinkage can be suppressed. For this reason, the generation | occurrence | production of the winding gap | deviation, a damage | wound, gloss unevenness, etc. resulting from the shrinkage | contraction of both layers 14 and 16 is suppressed (refer Table 1). Moreover, although mentioned later in detail, hardening of both layers 14 and 16 can be accelerated | stimulated by preserve | saving the original fabric roll 38 at a high preservation | save temperature.

  The ink receiving layer 14 and the colloidal silica layer 16 of the original fabric roll 38 just formed in the original fabric roll forming step 24 are not sufficiently cured. For this reason, in the original fabric roll preservation | save process 26, as above-mentioned, it preserve | saves at the storage temperature higher than coiling temperature within 5 days or more and 80 days or less.

  For example, when the storage temperature is lower than the coiling temperature or the storage period is less than 5 days, both layers 14 and 16 are not sufficiently cured, and scratches and uneven gloss are generated (see Table 4 below). ). Further, when the recording sheet original 36 is cut into the product width, cracks occur at the side edges of the recording sheet 10, and when the recording sheet 10 is bent, cracks occur. On the other hand, when the storage period exceeds 80 days, gloss unevenness deteriorates due to long-term storage in the heated fabric roll 38 (see Table 4 below).

  Therefore, by storing for 5 days or more and 80 days or less at a storage temperature higher than the winding temperature, the side of the recording paper 10 due to scratches, uneven gloss, or cutting caused by the two layers 14 and 16 not being sufficiently cured. Generation | occurrence | production of the crack of an edge part, a crack, etc. and the deterioration of the gloss nonuniformity resulting from preserve | saving for a long time in the heated state can be suppressed. In addition, it is preferable that the temperature difference of storage temperature and coiling temperature is 5 degreeC or more (refer Table 1).

  The raw roll 38 stored at a storage temperature higher than the winding temperature for 5 days or more is subjected to the product roll forming step 28 within 80 days at the latest. The product roll forming process 28 includes a cutting process 42 and a second winding process 44.

  In the cutting step 42, as shown in FIGS. 3 and 4, the recording paper original fabric 36 delivered from the original fabric roll 38 is cut into recording paper 10 having a plurality of product widths W (for example, 128 mm) by the slitter device 50. Yes. At this time, in this embodiment, the ink receiving layer 14 and the colloidal silica layer 16 of the recording paper original 36 are sufficiently cured, and the cutting property of the recording paper original 36 is improved. The occurrence of cracks at the side edges can be suppressed.

  Further, the slitter device 50 cuts the original recording paper 36 except for ΔW ≧ 5 mm as the ear portion 36a when the width of both side ends of the original recording paper 36 is ΔW (see FIG. 4). This is because when the ear portion 36a has a width ΔW of less than 5 mm, when the ear portion 36a and the recording paper 10 are cut and separated, the crack at the side end portion of the recording paper 10 on the ear portion 36a side is deteriorated. The number of cracks will increase (see Table 7 below). This crack can be determined by checking the end of the film surface of the outer peripheral portion of the product roll 20. It is presumed that the cracks are deteriorated because the ear part 36a is affected by external humidity. In this embodiment, since the ink receiving layer 14 and the colloidal silica layer 16 are sufficiently cured, cracks that cause NG (failure) do not occur even if the width ΔW is less than 5 mm. In order to improve the appearance, the width ΔW is preferably 5 mm or more.

  As shown in FIG. 3, in the second winding process 44 (see FIG. 2), a plurality of recording papers 10 cut by the slitter device 50 are wound into a roll by the winding device 52. In the winding device 52, two winding shafts 52a are arranged so that the side ends of the recording paper 10 do not overlap at the time of winding. The recording paper 10 and the ears 36a cut by the slitter device 50 are alternately distributed to the two winding shafts 52a and are simultaneously wound.

  A plurality of winding cores 54 are mounted on both winding shafts 52a according to the positions of the recording paper 10 and the ears 36a to be distributed, and the recording paper 10 and the ears 36a are wound around the respective winding cores 54. It is done. As a result, a product roll 20 is formed by winding the recording paper 10 around the winding core 54 in a roll shape. In addition, the outer diameter R of the core 54 in this embodiment is 70 mm. When the winding of the recording paper 10 is completed, the product roll 20 is pulled out from the winding shaft 52 a together with the winding core 54.

  As shown in FIG. 5, in the second winding process 44 (winding device 52), when the winding outer diameter of the product roll 20 is D and the product width of the product roll 20 (recording paper 10) is W, The product roll 20 satisfying D / W> 1.5 is formed.

  Here, the winding deviation, scratches, and gloss unevenness of the product roll 20 generally worsen as the winding outer diameter D increases or the product width W decreases. That is, as the D / W increases, the winding deviation, scratches, and gloss unevenness of the product roll 20 deteriorate. For this reason, conventionally, the winding outer diameter D and the product width W have been determined so as to satisfy D / W ≦ 1.5. In contrast, in the present embodiment, as described above, both layers 14 and 16 are sufficiently cured by storing the raw fabric roll 38 at a storage temperature higher than the winding temperature for 5 days or more and 80 days or less. . For this reason, even if the winding outer diameter D and the product width W are determined so as to satisfy D / W> 1.5, the occurrence of winding deviation, scratches, and gloss unevenness of the product roll 20 can be suppressed (see the following table). 5). As a result, since the outer diameter of the product roll 20 can be increased, the replacement frequency of the product roll 20 at the time of printing can be made lower than before.

  Next, the manufacturing flow of the recording paper 10 (product roll 20) in the roll form of the present invention will be described. First, in the coating / drying step 30, the ink receiving layer coating liquid and the colloidal silica layer coating liquid are coated and dried on the wide support 12 to form the recording paper original fabric 36. Next, in the first winding process 34, the recording paper original fabric 36 is wound up in a roll shape in an environment at a temperature of 20 ° C. to 25 ° C. to form an original fabric roll 38. Further, as described above, the water content of the recording paper original fabric 36 formed in the original fabric roll forming step 24 is adjusted to 2.5% or more and 5.0% or less.

  The original fabric roll 38 is stored in the original fabric roll storage step 26 at a storage temperature (25 ° C. to 40 ° C.) higher than the coiling temperature for 5 days or more and 80 days or less. As a result, the occurrence of winding misalignment, scratches, gloss unevenness, and the like of the original roll 38 due to the shrinkage of the ink receiving layer 14 and the colloidal silica layer 16 can be suppressed. Moreover, generation | occurrence | production of the damage | wound and gloss nonuniformity of the raw fabric roll 38 and the product roll 20 is suppressed because both layers 14 and 16 are fully hardened. Further, by setting the storage period of the original fabric roll 38 within 80 days, the deterioration of gloss unevenness caused by storing the original fabric roll 38 for a long time in a heated state can be suppressed (see Table 1).

  In the original fabric roll storing step 26, the original fabric roll 38 stored for five days or more is subjected to the cutting step 42 within 80 days at the latest. In the cutting step 42, the recording sheet original 36 sent from the original roll 38 is cut into the recording sheets 10 having a plurality of product widths (see FIGS. 3 and 4). At this time, as described above, since the ink receiving layer 14 and the colloidal silica layer 16 are sufficiently cured, the occurrence of cracks at the side edges of each recording paper 10 due to cutting is suppressed. Further, when cutting the original recording paper 36, 5 mm or more of the width ΔW at both end portions thereof is excluded as the ears 36a. Therefore, when cutting and separating the ears 36a and the recording paper 10, the recording is performed. It is possible to prevent the crack at the side end portion of the paper 10 on the ear portion 36a side from being deteriorated.

  Each recording paper 10 formed in the cutting step 42 is wound into a roll shape around the core 54 in the second winding step 44 to form the product roll 20. At this time, in the second winding process 44, the winding outer diameter D and the product width W of the product roll are determined so as to satisfy D / W> 1.5. Conventionally, as the D / W is increased, the winding deviation, scratches, and gloss unevenness of the product roll 20 are deteriorated. However, in the present embodiment, these layers 14 and 16 are sufficiently cured to deteriorate these. (See Table 5 below). Thereby, since the winding outer diameter of the product roll 20 can be increased, that is, the number of windings can be increased, the replacement frequency of the product roll 20 at the time of printing can be reduced as compared with the prior art.

  Further, in this embodiment, since the ink receiving layer 14 and the colloidal silica layer 16 are sufficiently cured, the occurrence of so-called bending cracks, in which both layers 16 are cracked when the recording paper 10 is bent, can be suppressed.

  In the second winding process 44 of the above embodiment, the product roll 20 is pulled out from the winding shaft 52a together with the winding core 54, but the present invention is not limited to this, and there is no winding core. The product roll 20 may be manufactured. For example, a winding core whose outer diameter can be expanded and contracted is attached to the winding shaft 52 a of the winding device 52, and the recording paper 10 is wound around the winding core in a roll shape. And after the product roll 20 is formed, the product roll 20 without a core is obtained by reducing the outer diameter of the core and extracting only the product roll 20.

  Examples of the present invention and comparative examples will be shown below to specifically describe the present invention. However, the present invention is not limited to these examples and comparative examples.

[Preparation of support (polyolefin resin-coated paper)]
A 1: 1 mixture of hardwood bleached kraft pulp (LBKP) and hardwood bleached sulfite pulp (LBSP) was beaten to 300 ml with Canadian Standard Freeness to prepare a pulp slurry. As a sizing agent, 0.5% by mass of alkyl ketene dimer with respect to pulp, 1.0% by mass of polyacrylamide with respect to pulp as a strengthening agent, 2.0% by mass of cationized starch with respect to pulp, and polyamide epichlorohydrin resin 0.5% by mass of pulp was added and diluted with water to give a 1% slurry. This slurry was made with a long paper machine to a basis weight of 170 g / m ² , dried and conditioned to obtain a base paper 12a of a support 12 (polyolefin resin-coated paper).

Next, a base paper made from a polyethylene resin composition obtained by uniformly dispersing 10% by mass of anatase-type titanium at 320 ° C. with respect to 100% by mass of low-density polyethylene having a density of 0.918 g / cm ^3. 12a was extrusion coated to a thickness of 35 μm at 200 m / min, and extrusion coated using a cooling roll having a finely roughened surface.

Similarly, a base resin 12a obtained by melting a blend resin composition of 70 parts by mass of a high density polyethylene resin having a density of 0.962 g / cm ³ and 30 parts by mass of a low density polyethylene resin having a density of 0.918 at 320 ° C. The other surface was extrusion coated so as to have a thickness of 30 μm, and extrusion coated with a roughened cooling roll. As a result, both surfaces of the base paper 12a were covered with the polyolefin resin layer 12b.

Next, the surface of one polyolefin resin layer 12b was subjected to high-frequency corona discharge treatment, and then an undercoat layer (not shown) having the following composition was applied and dried so that the gelatin content was 50 mg / m ^2, and the support 12 It was created. In addition, a part represents the mass part of solid content.

[Underlayer material]
Lime-processed gelatin 100 parts Sulfosuccinic acid-2-ethylhexyl ester salt 2 parts Chrome alum 10 parts

[Original recording paper]
On the surface provided with the undercoat layer (not shown) of the obtained support 12, an ink receiving layer coating solution and a colloidal silica layer coating solution having the following composition were simultaneously applied in the coating / drying step 30 (slide bead coater). Multi-layer coating was applied.

[Ink-receiving layer coating material]
Vapor phase silica (average primary particle size 7 nm, specific surface area 300 m ² / g by BET method)
100 parts dimethyldiallylammonium chloride homopolymer (Daiichi Kogyo Seiyaku Co., Ltd., Charol DC902P, molecular weight 9000) 4 parts boric acid 3 parts polyvinyl alcohol (saponification degree 88%, average polymerization degree 3500) 22 parts basic polyhydroxylation Aluminum (trade name: Pukeram WT, manufactured by Riken Green Co., Ltd.) 3 parts Surfactant (Betaine; manufactured by Nippon Surfactant, Swanol AM) 0.3 parts

[Colloidal silica layer coating material]
Colloidal silica (anionic spherical colloidal silica; Snowtex ST-OL40 manufactured by Nissan Chemical Industries, Ltd., average primary particle size 40-50 nm) 100 parts 0.5 mass% sodium hydroxide 0.045 parts cation Polymer: Polyfix 601 (made by Showa Polymer Co., Ltd., specially modified polyamine)
1 part polyvinyl alcohol (saponification degree 88%, average polymerization degree 3500) 4 parts surfactant (betaine type; manufactured by Nippon Surfactant, Swanol AM) 0.3 part

The concentration of the vapor phase method silica in the ink receiving layer coating solution was adjusted to 9% by mass. Further, the pH of the ink receiving layer coating solution was adjusted to 4.0. The moisture application amount of the ink receiving layer coating solution is 200 g / m ² (the solid content application amount of the vapor phase silica is 18 g / m ² ). The concentration of colloidal silica in the colloidal silica layer coating solution was adjusted to 8% by mass. The moisture coating amount of the colloidal silica layer coating solution is 12.5 g / m ² (the solid coating amount of colloidal silica is 1 g / m ² ). Then, both coating liquids applied to the upper layer of the polyolefin layer 12b (undercoat layer) of the support 12 are dried to form an ink receiving layer 14 having a thickness of about 35 μm and a colloidal silica layer 16 having a thickness of about 1 μm. A recording paper stock 36 was prepared.

[Original roll formation]
The obtained recording paper original fabric 36 was wound into a roll form in the first winding process 34 (winding device) to form an original fabric roll 38. In addition, the winding outer diameter of the original fabric roll 38 was changed according to each Example and the comparative example. Further, the winding temperature and the moisture content of the recording paper original 36 were also changed in accordance with each example and comparative example.

[Examples 1 to 16]
As shown in Table 1 below, in “Example 1”, a raw roll 38 wound up at a winding temperature of 20 ° C. in the first winding step 34 was created. The water content of the recording paper original 36 wound around the original roll 38 was 4.0%. Subsequently, this raw fabric roll 38 was stored for 5 days at a storage temperature of 25 ° C. in the raw fabric roll storage step 26 (storage device). The original recording paper 36 drawn from the original fabric roll 38 was cut by a cutting step 42 (slitter device 50) to produce a recording paper 10 having a product width W of 128 mm. Further, the width ΔW of the ear portion 36a at the time of cutting was set to 10 mm. The obtained recording paper 10 was wound into a roll form around the core 54 (outer diameter R = 70 mm) in the second winding step 44 (winding device 52) to form a product roll 20. The roll diameter D of the product roll 20 was set to 128 mm so that D / W was 1.0.

  In “Examples 2 to 6”, a raw fabric roll 38 and a product roll 20 were basically produced in the same manner as “Example 1”. However, in “Example 2”, the number of storage days of the raw fabric roll 38 was 80 days. In “Example 3”, the winding temperature of the raw roll 38 was 25 ° C., and the storage temperature was 30 ° C. In “Example 4”, the same conditions as in “Example 3” were adopted except that the storage days were set to 80 days. In “Example 5”, the winding temperature of the raw roll 38 was 25 ° C., and the storage temperature was 40 ° C. In “Example 6”, the same conditions as in “Example 5” were adopted except that the storage days were set to 80 days.

  In “Example 7”, the storage temperature of the raw fabric roll 38 was 21 ° C. In “Example 8”, the conditions were the same as those in “Example 7” except that the storage period was 80 days. In “Example 9”, the winding temperature of the raw roll 38 was 25 ° C., and the storage temperature was 26 ° C. In “Example 10”, the conditions were the same as in “Example 9” except that the number of storage days was 80 days.

  In “Example 11”, the winding temperature of the raw roll 38 was set to 30 ° C., and the storage temperature was set to 35 ° C. In “Example 12”, the conditions were the same as those in “Example 11” except that the storage period was 80 days. In “Example 13”, the winding temperature of the raw roll 38 was set to 30 ° C., and the storage temperature was set to 40 ° C. In “Example 14”, the conditions were the same as in “Example 13” except that the number of storage days was 80. In “Example 15”, the winding temperature of the raw roll 38 was set to 35 ° C., and the storage temperature was set to 40 ° C. In “Example 16”, the conditions were the same as those in “Example 15” except that the storage period was 80 days.

[Comparative Examples 1 to 22]
As shown in Tables 2 and 3 below, in “Comparative Examples 1 to 22”, the raw roll 38 and the product roll 20 were basically created in the same manner as in “Example 1”. The take-up temperature and the storage temperature were set to the winding temperature ≧ storage temperature. In “Comparative Example 1”, the winding temperature of the raw roll 38 was 20 ° C., and the storage temperature was 20 ° C. In “Comparative Example 2”, the same conditions as in “Comparative Example 1” were used except that the storage days were 80 days. In “Comparative Example 3”, the winding temperature of the raw roll 38 was 25 ° C., and the storage temperature was 25 ° C. In “Comparative Example 4”, the same conditions as in “Comparative Example 3” were used except that the storage period was 80 days. In “Comparative Example 5”, the winding temperature of the raw roll 38 was 25 ° C., and the storage temperature was 20 ° C. In “Comparative Example 6”, the same conditions as in “Comparative Example 5” were used except that the storage period was 80 days.

  In “Comparative Example 7”, the winding temperature of the raw roll 38 was set to 30 ° C., and the storage temperature was set to 30 ° C. In “Comparative Example 8”, the same conditions as in “Comparative Example 7” were used except that the storage period was 80 days. In “Comparative Example 9”, the winding temperature of the raw roll 38 was set to 30 ° C., and the storage temperature was set to 25 ° C. In “Comparative Example 10”, the same conditions as in “Comparative Example 9” were used except that the storage days were 80 days. In “Comparative Example 11”, the winding temperature of the raw roll 38 was set to 35 ° C., and the storage temperature was set to 35 ° C. In “Comparative Example 12”, the same conditions as in “Comparative Example 11” were used except that the storage days were 80 days.

  In “Comparative Example 13”, the winding temperature of the raw roll 38 was set to 35 ° C., and the storage temperature was set to 30 ° C. In “Comparative Example 14”, the same conditions as in “Comparative Example 14” were used except that the storage period was 80 days. In “Comparative Example 15”, the winding temperature of the raw roll 38 was set to 35 ° C., and the storage temperature was set to 25 ° C. In “Comparative Example 16”, the same conditions as in “Comparative Example 15” were used except that the storage days were 80 days. In “Comparative Example 17”, the winding temperature of the raw fabric roll 38 was 40 ° C., and the storage temperature was 40 ° C. In “Comparative Example 18”, the same conditions as in “Comparative Example 17” were adopted except that the storage days were 80 days.

  In “Comparative Example 19”, the winding temperature of the raw fabric roll 38 was 40 ° C., and the storage temperature was 35 ° C. In “Comparative Example 20”, the same conditions as in “Comparative Example 19” were used except that the storage days were 80 days. In “Comparative Example 21”, the winding temperature of the raw fabric roll 38 was 40 ° C., and the storage temperature was 30 ° C. In “Comparative Example 22”, the same conditions as in “Comparative Example 21” were used except that the storage days were 80 days.

[Comparative Examples 23 to 34]
As shown in Table 4 below, in “Comparative Examples 23 to 34”, the storage days of the raw fabric roll 38 were set to less than 5 days or 81 days or more. In “Comparative Examples 23 to 26”, a raw fabric roll 38 and a product roll 20 were basically produced in the same manner as “Example 1”. However, in “Comparative Example 23”, the number of storage days was two. In “Comparative Example 24”, the storage period was 4 days. In “Comparative Example 25”, the storage period was 81 days. In “Comparative Example 26”, the storage period was 100 days.

  In “Comparative Examples 27 to 30”, a raw fabric roll 38 and a product roll 20 were basically produced in the same manner as “Example 3”. However, in “Comparative Example 27”, the number of storage days was two. In “Comparative Example 28”, the storage period was 4 days. In “Comparative Example 29”, the storage period was 81 days. In “Comparative Example 30”, the storage period was 100 days.

  In “Comparative Examples 31 to 34”, a raw fabric roll 38 and a product roll 20 were basically produced in the same manner as “Example 5”. However, in “Comparative Example 31”, the number of storage days was two. In “Comparative Example 32”, the storage period was 4 days. In “Comparative Example 33”, the storage period was 81 days. In “Comparative Example 34”, the storage period was 100 days.

  For each of the above-mentioned “Examples 1 to 16” and “Comparative Examples 1 to 34”, a total of 5 “original fabric winding deviation”, “product winding deviation”, “scratch”, “gloss unevenness”, and “edge crack”. Items were evaluated.

  In the evaluation of the “original roll winding deviation”, the presence or absence of winding deviation of the original roll 38 before the cutting process 42 was input was visually confirmed after completion of the original roll storing process 26. Then, “◯” was entered in the evaluation column when no winding deviation occurred, and “X” was entered when the winding deviation occurred.

  In the evaluation of “product winding deviation”, the created product roll 20 was stored at room temperature (25 ° C.) for one month, and then the presence or absence of winding deviation was visually confirmed. Then, “◯” was entered in the evaluation column when no winding deviation occurred, and “X” was entered when the winding deviation occurred.

  In the evaluation of “scratches”, the produced product roll 20 was stored at room temperature (25 ° C.) for one month, and then the product roll 20 was unwound to visually check the scratches. In the evaluation column, enter “◯” if there is no damage, “△” if there is a slight damage but is acceptable, and “×” if the damage is NG. did.

  In the evaluation of “gloss unevenness”, the produced product roll 20 was stored at room temperature (25 ° C.) for one month, and then the product roll 20 was unwound to visually confirm the uneven gloss. In the evaluation column, “◯” is displayed when gloss unevenness is not generated, “△” is displayed when gloss unevenness is slightly observed but is acceptable, and “X” is displayed when gloss is generated and NG. Filled in.

  In the evaluation of “end portion crack”, the crack at the side end portion of the recording paper 10 was confirmed by visually observing the end portion of the film surface of the outer peripheral portion of the product roll 20. Enter “○” in the evaluation column if no cracks are observed, “△” if a slight crack is observed but within the allowable range, and “×” if the crack is NG. did.

  As shown in Tables 1 to 4 above, the original fabric roll 38 is stored at a storage temperature higher than the coiling temperature for 5 days or more and within 80 days, resulting in shrinkage of the ink receiving layer 14 and the colloidal silica layer 16. It was confirmed that occurrence of winding deviation, scratches, gloss unevenness and the like of the raw roll 38 can be suppressed. Furthermore, it was confirmed that the occurrence of winding deviation, scratches, gloss unevenness and the like of the raw fabric roll 38 can be further suppressed by setting the temperature difference between the winding temperature and the storage temperature to 5 ° C. or more.

  In addition, since both layers 14 and 16 are sufficiently cured, the product roll 20 can be prevented from being scratched and uneven gloss, and the occurrence of cracks at the side edges of the recording paper 10 due to cutting can be suppressed. confirmed. Moreover, it was confirmed that the deterioration of gloss unevenness caused by storing the raw fabric roll 38 for a long period of time while the raw fabric roll 38 is heated is suppressed by setting the storage period of the original fabric roll 38 within 80 days.

[Examples 17 to 20, Comparative Examples 35 and 36]
As shown in Table 5 below, in Examples 17 to 20, the product roll 20 was basically created in the same manner as in “Example 3”, but the winding outer diameter D of the product roll 20, that is, D / W Was enlarged. In “Example 17”, the winding outer diameter was 192 mm, and the D / W was 1.5. In “Example 18”, the winding outer diameter was 256 mm, and D / W was 2.0. In “Example 19”, the winding outer diameter was 320 mm, and the D / W was 2.5. In “Example 20”, the winding outer diameter was 384 mm, and the D / W was 3.0.

  In Comparative Examples 35 and 36, the product roll 20 was basically created in the same manner as in “Comparative Example 3”, but the winding outer diameter D (D / W) of the product roll 20 was increased. In “Comparative Example 35”, the winding outer diameter was 192 mm and D / W was 1.5. In “Comparative Example 36”, the winding outer diameter was 256 mm, and D / W was 2.0.

  And about each Example 17-20 and each comparative example 35 and 36, evaluation regarding the above-mentioned 5 item was similarly performed.

  As shown in Table 5 above, as the D / W increases, the product winding deviation, scratches, and gloss unevenness deteriorated in the past, but the raw roll 38 was kept at a storage temperature higher than the winding temperature for 5 days or more. It was confirmed that these deteriorations can be suppressed by storing within 80 days.

[Examples 21 to 25]
As shown in Table 6 below, in Examples 21 to 25, the original fabric roll 38 and the product roll 20 were basically created in the same manner as in Example 18, but the recording paper wound around the original fabric roll 38 was used. The moisture content of the original fabric 36 was changed. In “Example 21”, the moisture content of the original recording paper 36 was set to 2.0%. In “Example 22”, the moisture content of the original recording paper 36 was set to 2.5%. In “Example 23”, the moisture content of the original recording paper 36 was 4.6%. In “Example 24”, the moisture content of the original recording paper 36 was set to 5.0%. In “Example 25”, the moisture content of the original recording paper 36 was 5.3%. And about each Example 21-25, evaluation regarding the above-mentioned 5 item was performed similarly.

  As shown in Table 6 above, the moisture content of the recording paper original fabric 36 wound around the original fabric roll 38 is determined while storing the original fabric roll 38 at a storage temperature higher than the winding temperature for 5 days or more and 80 days or less. It was confirmed that when the content is set to 2.5% or more and 5.0% or less, the product roll 20 is not damaged, gloss is uneven, and the side edge of the recording paper 10 is not cracked due to cutting.

[Examples 26 to 30]
As shown in Table 7 below, in Examples 26 to 30, the product roll 20 was created in the same manner as in “Example 18”, but the original recording paper 36 drawn from the original roll 38 was cut. The width ΔW of the ear portion 36a when cutting in the step 42 was changed. In “Example 26”, the width ΔW of the ear portion 36a was set to 3 mm. In “Example 27”, the width ΔW of the ear portion 36a was set to 4 mm. In “Example 28”, the width ΔW of the ear portion 36a was set to 5 mm. In “Example 29”, the width ΔW of the ear portion 36a was set to 6 mm. In “Example 30”, the width ΔW of the ear portion 36a was set to 7 mm. And about each Example 25-29, evaluation regarding the above-mentioned 5 item was performed similarly.

  As shown in Table 7 above, it was confirmed that the cracks at the side edges of the recording paper 10 due to cutting were eliminated by setting the width ΔW of the ear 36a to 5 mm or more.

It is sectional drawing of an inkjet recording paper. It is a flowchart of the manufacturing process (product roll manufacturing process) of the product roll which made the inkjet recording paper the roll form. It is a perspective view of the slitter apparatus used at the cutting process of a product roll manufacturing process. It is the top view which looked at the slitter apparatus in FIG. 3 from the upper surface. It is a perspective view of a product roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inkjet recording paper 12 Support body 14 Ink receiving layer 14a Gas phase method silica 16 Colloidal silica layer 16a Colloidal silica 20 Product roll 22 Product roll manufacturing process 26 Raw roll roll preservation process 30 Application | coating and drying process 34 First winding process 36 Recording Paper original 36a Ear 38 Raw roll 42 Cutting process 44 Second winding process 54 Core

Claims (6)

Inkjet in roll form by winding up a recording material body in which an ink receiving layer mainly containing at least one layer of inorganic fine particles and a layer containing colloidal silica and a cationic compound are sequentially or simultaneously coated on a support. In the recording material manufacturing method,
A raw roll forming step of winding the recording material body into a roll to form a raw roll,
A raw roll storing step of storing the raw roll at a temperature higher than the temperature at the time of winding of the recording material body within 5 days to 80 days;
An ink jet recording material comprising: a product roll forming step of cutting the recording material body fed from the original fabric roll that has undergone the original fabric roll storage step and winding the recording material into a roll shape to form a product roll Manufacturing method.   2. The product roll forming step of forming the product roll satisfying D / W> 1.5, where W is a width of the product roll and D is a winding outer diameter. Manufacturing method of inkjet recording material.   The inkjet recording material according to claim 1 or 2, wherein a temperature difference between a storage temperature in the raw roll storing step and a winding temperature in the raw roll forming step is 5 ° C or more. Method.   The inkjet according to any one of claims 1 to 3, wherein the moisture content of the recording material body is adjusted so that the moisture content of the recording material body is 2.5% or more and 5.0% or less. Manufacturing method of recording material.   5. The method of manufacturing an ink jet recording material according to claim 1, wherein in the product roll forming step, the recording material body is cut by removing at least 5 mm from both ends of the recording material main body as an ear portion. Inkjet in roll form by winding up a recording material body in which an ink receiving layer mainly containing at least one layer of inorganic fine particles and a layer containing colloidal silica and a cationic compound are sequentially or simultaneously coated on a support. In recording materials,
The recording material body is wound into a roll form to form a raw roll, and the raw roll is stored at a temperature higher than the temperature at the time of forming the raw roll within 5 days to 80 days. An ink jet recording material, wherein the recording material body fed from a raw roll is cut into a product roll cut into a roll form.

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