JP6454572B2 - Printed matter - Google Patents

Description

  The present invention partially prints an ultraviolet curable varnish on a substrate with an offset printing machine (this ultraviolet curable varnish layer is also referred to as an underprint layer), and an inline coater attached to the offset printing machine or Applying water-based UV-curable overprint varnish, which has a dry touch and a soft touch, to the entire surface as an overprint layer on various offline coaters, the repellency phenomenon between the underprint layer and the overprint layer can be reduced. The present invention relates to a printed material that can be used to form a fine uneven pattern on the surface of a printed material partially or entirely, and to obtain a moist and soft hand feeling and a design property resulting from the uneven pattern.

  Conventionally, in the commercial printing field (mainly in the packaging field), a coating process (aqueous varnish, UV clear) is applied to the printed material for the purpose of cosmetic decoration and surface protection. In addition, various surface treatments such as press processing that gives a mirror gloss to the printed matter by heating and pressurizing the printed matter coated with aqueous varnish with a stainless steel plate with a mirror surface, and laminating processing that bonds a film such as OPP or PET to the printed matter Has been implemented.

  In recent years, an increasing number of attempts have been made to give cosmetics and functions not found in conventional printed materials and to differentiate them from competing products. The reason for this is that the design, function, design, and cosmetics of printed paper containers have a great influence on product sales.

  One surface processing method that has design and cosmetic properties is called pseudo embossing. This utilizes the varnish of the underprint layer having the property of repelling the varnish of the overprint layer. That is, the varnish of the overprint layer applied on the underprint layer is repelled to form droplets and form an uneven pattern. The varnish of the overprint layer applied to the portion without the underprint layer forms a smooth film. Therefore, a concavo-convex pattern portion and a smooth and glossy portion are formed on the surface of the finished printed matter.

  The uneven pattern portion is diffusely reflected by light and has a low gloss and a matte feeling, and the other portions have a high gloss and glossy finish. This is sometimes called pseudo embossing because it looks similar to a mechanically embossed one that has been performed conventionally. This processing method is also called pseudo embossing in this specification. This processing is used in the field of packaging materials such as product boxes and the field of advertising. Patent documents 1 and 2 are mentioned as literature in which art about this processing method was described.

  However, the conventional pseudo-embossing uses a glossy underprint varnish and an overprint layer varnish, and the matte part is formed in the part where grains are formed by overlapping repelling and the light is diffusely reflected. In general, it produces a design with a high glossy contrast difference, and the presence of a matte part formed by fine irregularities due to the repelling effect of each layer where the underprinting layer and the overprinting layer overlap, and the underprinting layer The design property is maintained from the glossy part of the overprint layer only. However, in this conventional pseudo-embossing process, for example, when using a paper whose substrate is originally glossy, a film or a film whose surface is foil-processed or hologram-processed, a film, etc. In addition, it cannot be said that the design effect is sufficient. In addition, the main components of conventional overprint varnishes are mainly amine-modified polyester acrylate oligomers, acrylate oligomers, acrylate monomers, etc. Therefore, the feeling of touch is hard as rough and the touch feeling is not good. In the present invention, only a semi-matt portion (a portion that does not completely reach the mat portion) generated by fine unevenness due to the repelling effect of each layer where the underprint layer and the overprint layer overlap, and only the overprint layer without the underprint layer are moist. By forming a mat portion with a soft hand feeling, the effect of design is expanded and produced from both the visual and touch aspects. It also takes into consideration the ability to stack bars, which is essential for handling during printing.

JP 2003-181370 A Japanese Patent Laid-Open No. 6-8391

  The subject of the present invention is a semi-matt part where the overprinting layer by the UV curable underprint varnish and the aqueous UV curable overprint varnish overlaps, and the design difference that has never been achieved with the contrast difference in which the other parts are matted. Provided is a printed material having a soft touch effect.

  As a result of intensive research, the inventors have found that the repelling effect of the aqueous UV curable overprint varnish by the UV curable underprint varnish provided on the surface of the substrate and the print layer and the softness by the overprint layer. Provided is a printed matter characterized by having two design properties of a moist touch effect.

  That is, according to the present invention, a printing layer using an ultraviolet curable ink is provided on a substrate, and an underprint layer by an ultraviolet curable underprint varnish is partially or entirely on the surface of the substrate and the printing layer. On the entire surface of the substrate, the printing layer and the underprinting layer, an overprinting layer formed of an aqueous UV curable overprint varnish is provided, and the portion where the underprinting layer and the overprinting layer overlap with each other, The overprinting layer is formed into particles or irregularities by repelling, and a non-overlapping portion forms a continuous film.

  The printed matter of the present invention comprises a semi-matt portion (a portion that does not completely reach the mat portion) generated by fine unevenness due to the repelling effect of each layer where the underprint layer and the overprint layer overlap, and a moist of the overprint layer without the underprint layer. By forming the mat part with a soft hand feeling, the effect of the design can be further expanded from both visual and touch aspects.

It is a sketch of the picture pattern used for the evaluation work regarding the printed matter of the present invention. It is a figure which shows the solid printing part by the first oiliness and UV ink which shows the printing procedure which produces the printed matter of FIG. FIG. 3 is a diagram showing an application part of an ultraviolet curable underprint varnish following the solid printing with the oily and UV inks of FIG. 2. FIG. 4 is a diagram showing an application portion of an overprinting layer using an aqueous ultraviolet curable overprint varnish following FIGS.

  Hereinafter, embodiments of the present invention will be described in detail. Unless otherwise specified, all percentages and parts in the specification are based on mass.

In the printed matter of the present invention, a printing layer using an ultraviolet curable ink is provided on a substrate, and an underprint layer by an ultraviolet curable underprint varnish is partially or entirely on the surface of the substrate and the printing layer. On the entire surface of the substrate, the printing layer and the underprinting layer, an overprinting layer formed of an aqueous UV curable overprint varnish is provided, and the portion where the underprinting layer and the overprinting layer overlap with each other, The overprint layer is formed into particles or irregularities by repelling, and a non-overlapping portion forms a continuous film.
In the printed matter of the present invention, the UV curable underprint varnish does not necessarily have to be formed on a printed pattern using UV curable ink, but is directly applied to a substrate such as paper, plastic film, metal foil, etc. Can be partially or entirely formed by printing or the like, and an aqueous ultraviolet curable overprint varnish layer can be formed thereon.

  If the outline of the production procedure of the printed matter of the present invention is explained, it is mainly an offset inline machine, after printing a pattern with UV ink and curing with an intermediate cylinder, then with an offset printing plate such as a PS plate or a CTP plate. After printing a pattern or the like by the underprint layer with the UV curable underprint varnish, the entire surface is coated with an aqueous UV curable overprint varnish that will be the overprint layer on the varnish coater cylinder, and then again irradiated with UV and dried and cured. In that case, it is preferable that the underprint layer is not cured with UV light because the repelling property of the overprint varnish is good. In the delivery, the moisture of the overprint varnish of the present invention evaporates with the help of the lamp heat, and the UV curable monomer becomes a strong binder for fixing the blended urethane resin beads by UV light, and is fixed to the original fabric. The portion with the underprint layer is finished in a semi-matt shape by repelling, and the portion without the underprint layer is mat-like and has a soft hand feeling due to the effect of the aqueous ultraviolet curable overprint varnish on the coating surface. It should be noted that the overprinting in the wet state without sufficiently drying after the underprinting has a greater repelling effect due to the underprinting layer than the overprinting after the underprinting drying, and the mat / semi-matt contrast tends to be remarkable. It is more preferable.

  In the printed matter of the present invention, the adjustment of the repellency of the cured film of the aqueous ultraviolet curable overprint layer is carried out by using an curable varnish by an ultraviolet curable underprint varnish used for the underprint layer and an aqueous ultraviolet curable overprint varnish. By selecting this resin, it can be carried out depending on the repulsion depending on the characteristics of the resins to be employed and the type and amount of the release silicone added to the ultraviolet curable underprint varnish that forms the film.

  Examples of the resin employed for Hajikinis, which is an ultraviolet curable underprint varnish used for the underprint layer, include polyester resins, epoxy resins, and urethane resins. Examples of the oligomer include polyester acrylate, epoxy acrylate, and urethane acrylate.

  As the release silicone used for the Hajikinis, dimethylpolysiloxane has a main structure and may be partially organically modified. Moreover, the acryloyl group modification | denaturation used as the reaction site of an ultraviolet-ray may be carried out. The molecular weight of the release silicone is preferably 1,000 to 1,000,000. The addition amount is preferably in the range of 0.1 to 15% by mass of the total amount of varnish, and considering the stable repelling property and printability, it is more preferable to add in the range of 0.1 to 10% by mass. preferable.

  The printed matter of the present invention is an aqueous ultraviolet curable overprint varnish composition containing a urethane resin, an ultraviolet curable monomer having water-soluble (meth) acrylate as essential components, and water, and the urethane resin / ultraviolet curable composition. Monomer = 1: 2 to 2: 1 (weight ratio), and the coefficient of dynamic friction of the dry coated surface after application of the aqueous ultraviolet curable overprint varnish composition is 0.1 to 0.7, and the measurement speed is An aqueous ultraviolet curable overprint varnish characterized by an increase rate of the dynamic friction coefficient when increased from 2 mm / s to 20 mm / s is 10% or more.

  The water-based ultraviolet curable overprint varnish contains a urethane resin, an ultraviolet curable monomer containing water-soluble (meth) acrylate as essential components, and water.

  As the urethane resin, urethane resin beads or those in which beads are dispersed in an aqueous solvent (also referred to as a dispersion, including urethane resin dispersions, aliphatic polyurethane dispersions, etc.) are used. Can do. In particular, the glass transition point (Tg) determined by DSC thermal analysis is preferably −90 ° C. to −70 ° C. The glass transition point (Tg) confirmed in the present invention was measured by using [DSC822e] manufactured by METTLER TOLEDO, and after putting about 7 mg of a measurement object into an aluminum pan in a nitrogen atmosphere and pressing and sealing, it was −100 to It is obtained from the inflection point of the heat flow curve when the range of + 150 ° C. is scanned at a heating rate of 10 ° C./min.

  Furthermore, the average particle diameter of the urethane beads is preferably in the range of 0.1 to 10 μm, more preferably 0.8 to 6 μm. When the particle size is small, there is a tendency that a soft hand feeling is difficult to be produced, and when the particle size is large, there are various problems such as poor friction resistance, product stability (sedimentation), and coating unevenness.

  A water-soluble (meth) acrylate may be contained as an ultraviolet curable monomer used in the aqueous ultraviolet curable overprint varnish composition. Specific examples of the water-soluble (meth) acrylate include hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, polyethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, N- (2-hydroxyethyl) acrylamide (abbreviation: HEAA), N- (2-hydroxyethyl) methacrylamide, N- (2-hydroxymethyl) acrylamide, N- (2-hydroxymethyl) methacrylamide, acryloylmorpholine, methylolacrylamide Dimethylacrylamide, methoxymethylacrylamide, diethylacrylamide, isopropylacrylamide, polyethylene glycol di (meth) acrylate, etc. But it is, not to be limited to these.

  The ratio between the urethane resin part and the ultraviolet curable monomer part having a water-soluble (meth) acrylate as an essential component in the aqueous ultraviolet curable overprint varnish composition is in terms of nonvolatile content, urethane resin part: UV curable monomer part. = 1: 2 to 2: 1 is desirable, and more desirably, urethane resin part: UV curable monomer part = 1: 1 to 2: 1. Regarding this ratio, when the UV curable monomer part increases, the hand feeling tends to decrease mainly, and when the urethane resin part increases, the physical properties such as friction resistance mainly decrease. Head. For this reason, the ratio shown here makes the physical properties moderately compatible.

  The water blended and contained is 1 to 65% by weight, preferably 25 to 60% by weight, and more preferably 40 to 60% by weight. Water evaporates from the coated surface, leaving the urethane resin part and the UV curable monomer part, that is, when the water content increases to some extent, the urethane beads are easily exposed from the binder of the dry coating film. Will be buried. However, when an extremely large amount of water is contained, the binder becomes too small and problems such as poor urethane bead fixing are likely to occur. Therefore, the optimum value is within the above range.

  Further, regarding the influence on the touch of the dry coated surface after coating of the aqueous ultraviolet curable overprint varnish composition, the coated surface and the dried coated surface of the smooth portion where the undercoat layer and the overcoat layer after coating do not overlap By controlling the dynamic friction coefficient with respect to the rubbing speed, it is possible to obtain a coated surface that retains a soft velvet-like or suede-like soft feel in the numerical range of the dynamic friction coefficient for a specific measurement speed. Found. That is, the dynamic friction coefficient at a high test speed is increased compared to the dynamic friction coefficient at a low test speed, the dynamic friction coefficient is 0.1 to 0.7, and the measurement speed is increased from 2 mm / s to 20 mm / s. The effect of the present invention is achieved when the rate of increase in the dynamic friction coefficient when increased is 10% or more.

  A water-insoluble polyfunctional (meth) acrylate may be added as an ultraviolet curable monomer used in the aqueous ultraviolet curable overprint varnish composition. If all UV-curable monomers are composed of water-soluble (meth) acrylate, the resulting coating will be less resistant to blocking, such as poor blocking resistance, and combined with water-insoluble polyfunctional (meth) acrylate. These can be supplemented.

  Specific examples of the water-insoluble polyfunctional (meth) acrylate include polypropylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, nonanediol di (meth) acrylate, bisphenol A di (meth) acrylate, and bisphenol F. Di (meth) acrylate, trimethylolpropane tri (meth) acrylate (abbreviation: TMPTA), pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, polypropylene glycol, hexanediol , Nonanediol, bisphenol A, bisphenol F, trimethylolpropane, pentaerythritol, ditrimethylolpropane, etc. It can be mentioned (meth) acrylates of alkylene oxide (EO) adducts, but are not limited to.

  In addition, as the (meth) acrylates of the alkylene oxide (EO) adduct, a compound having an alkylene oxide addition mole number per molecule of less than 4 is water-insoluble. Further, if trimethylolpropane tri (meth) acrylate (TMPTA) is taken as an example, the amount added is 0.5% by weight with respect to the total amount of the aqueous ultraviolet curable overprint varnish composition because the coated surface is hardly damaged. % Or more and a soft hand feeling such as velvet tone or suede tone is preferable, so that it is preferably 10.0% by weight or less, more preferably 5.0% by weight or less. 0.5 wt% or more and 15 wt% or less in terms of solid content excluding water is preferable, and more preferably 0.5 wt% or more and 8 wt% or less in terms of solid content.

  The aqueous ultraviolet curable overprint varnish composition needs to be added with a photopolymerization initiator or a sensitizer in order to be cured with ultraviolet rays.

  Specific examples of the photopolymerization initiator and sensitizer include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl- 1-phenyl-propan-1-one, benzophenone, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-propan-1-one, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, bis (2,6-dimethoxybenzoyl) -2 , 4,4-trimethyl-pentylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4, -Trimethylbenzoyldiphenylphosphine oxide, benzyldimethyl ketal, 2,4,6-trimethylbenzophenone, oligo [2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone], 2-isopropyl Examples thereof include thioxanthone, 2,4-diethylthioxanthone, [4- (methylphenylthio) phenyl] phenylmethanone, ethyl anthraquinone, p-dimethylaminobenzoic acid isoamyl ester, and p-dimethylaminobenzoic acid ethyl ester. However, it is not limited to these. These photopolymerization initiators and sensitizers should be added within a range of 1 to 15% with respect to the UV curable monomer part in the aqueous UV curable overprint varnish composition, and 1 to 20% in terms of solid content. Is preferred.

  There are no particular limitations on the printing substrate to be used in the printed matter of the present invention, for example, paper such as fine paper, coated paper, art paper, imitation paper, thin paper, cardboard, polyester resin, acrylic resin, vinyl chloride resin, Vinylidene chloride resin, polyvinyl alcohol, polyethylene, polypropylene, polyacrylonitrile, ethylene vinyl acetate copolymer, ethylene vinyl alcohol copolymer, ethylene methacrylic acid copolymer, nylon or polylactic acid, polycarbonate film or sheet, cellophane, aluminum Examples of faoils and other various equipment conventionally used as printing base materials can be given. In addition, when using paper with a glossy base material, paper with film or surface processed with foil or hologram, and film, etc., an overprinting layer with UV curable underprint varnish and aqueous UV curable overprint varnish The contrast between the semi-matte part with the glossiness added to the matte part with only the water-based UV-curable overprint varnish without the underprint layer of the UV-curable underprint varnish added to the semi-matte part where the two layers overlap. By contrast, a unique expression unique to the present invention that cannot be reproduced by conventional pseudo-embossing can be expressed.

According to the method for producing a printed matter of the present invention, there is no semi-matt portion (a portion that does not completely reach the mat portion) generated by fine unevenness due to the repelling effect of each layer where the underprint layer and the overprint layer overlap, and there is no underprint layer. It can be applied to, for example, a map for visually handicapped persons by utilizing the difference in feel of the mat portion having a soft and soft hand feeling of only the overprint layer.
(1) “Paper part” and “Paper + Ink part” are surfaces A that provide a smooth texture. (2) “Water-based UV curable overprint varnish” and “ink part + water-based UV curable overprint varnish” are surfaces B that are soft to the touch. (3) "UV curable underprint varnish + aqueous UV curable overprint varnish" and "Ink part + UV curable underprint varnish + aqueous UV curable overprint varnish" are unique due to repelling. It is assumed that the surface C is an expression of (a slightly rough feel).
For example, if the map is processed with “Surface A that makes the sea / river smooth”, “Surface B that makes the forest part soft”, “Surface C that makes the city crumbly”, an unprecedented real map can be obtained. It can be easily distinguished by visually impaired people.

In the production of the printed matter of the present invention, an offset inline coater, an off-line coater, a flexographic printing method are used as a method for forming both an underprint layer with an ultraviolet curable underprint varnish and an overprint layer with an aqueous ultraviolet curable overprint varnish. Further, a gravure printing method or the like can be adopted, and printing may be performed by combining each method.
It should be noted that after underprinting, when the overprinting is performed in a wet state without being sufficiently dried, the repellency effect due to the underprinting layer is greater than the overprinting after the underprinting drying, and the mat / semi-matt contrast is remarkable. Therefore, an offset inline coater is more preferable.

  Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the following, unless otherwise specified, “part” and “%” mean “part by weight” and “% by weight”, respectively.

<Preparation of UV curable underprint varnish (underprint varnish-D1)>
Magnesium carbonate 5.0 parts, epoxy acrylate 40.0 parts, dipentaerythritol hexaacrylate 27.0 parts, EO-modified trimethylolpropane triacrylate 15.0 parts, 1-hydroxy-cyclohexyl-phenyl-ketone 8.0 parts, After 5.0 parts of silicone acrylate were easily mixed by hand, the mixture was wrought with a three-roll mill until the particle size became 10 microns or less. The viscosity was adjusted to TV5-7.

<Preparation of oxidation polymerization type oil-based underprint varnish (underprint varnish-D2)>
20.0 parts of calcium carbonate, 30.0 parts of rosin-modified phenolic resin, 25.0 parts of vegetable oil, and 25.0 parts of light oil are mixed by hand and then smelted to a particle size of 10 microns or less with a three-roll mill. I got meat. The viscosity was adjusted to be TV9-11.

<Preparation of aqueous UV curable overprint varnish (overprint varnish-U1)>
27.0 parts of an aqueous aliphatic polyurethane dispersion having a glass transition point (Tg) of −80 ° C. and an average particle size of 1.5 μm, 54.0 parts of water, N- (2-hydroxyethyl) acrylamide (HEAA) 17.5 Parts, trimethylolpropane triacrylate (TMPTA) 0.5 parts, mixed and stirred using a mixer, and further 2-hydroxy-2-methyl-1-phenyl-propan-1-one (DAROCUR1173) An overprinting varnish-U1 was prepared by adding 1.0 part and completely dissolving. The weight ratio A / C = 1.54 of A: polyurethane dispersion and C: N- (2-hydroxyethyl) acrylamide (HEAA).

<Preparation of aqueous UV curable overprint varnish (overprint varnish-U2-U6)>
The raw materials were mixed in the formulation shown in Table 1, stirred and dispersed using a mixer, and the photopolymerization initiator was completely dissolved to prepare in the same manner as for the overprint varnish-U1, and for each, A: The weight ratio A / C of the polyurethane dispersion and C: N- (2-hydroxyethyl) acrylamide (HEAA) was described.

原料Ａ：平均粒子径約１．５μｍのウレタン樹脂を含む脂肪族ポリウレタンディスパージョンの固形分
原料Ｂ：水
原料Ｃ：Ｎ−（２−ヒドロキシエチル）アクリルアミド（ＨＥＡＡ）
原料Ｄ：トリメチロールプロパントリアクリレート（ＴＭＰＴＡ）
原料Ｅ：２−ヒドロキシ−２−メチル−１−フェニル-プロパン−１−オン（ＤＡＲＯＣＵＲ１１７３）

Raw material A: Solid content raw material of aliphatic polyurethane dispersion containing urethane resin having an average particle size of about 1.5 μm B: Water raw material C: N- (2-hydroxyethyl) acrylamide (HEAA)
Raw material D: trimethylolpropane triacrylate (TMPTA)
Raw material E: 2-hydroxy-2-methyl-1-phenyl-propan-1-one (DAROCUR 1173)

  In addition to the overprint varnishes U1 to U6, the overprint varnishes C1 and C2 by UV curable embossing clear were prepared through the following adjustments.

<Preparation of UV curable embossed clear (overprint varnish-C1)>
60.0 parts of polyester acrylate, 30.0 parts of EO-modified trimethylolpropane triacrylate, and 10.0 parts of 1-hydroxy-cyclohexyl-phenyl-ketone were mixed and dissolved using a mixer. The viscosity was adjusted to about 35 seconds with the Zahn cup viscosity (# 4).

<Preparation of UV curable embossed clear (overprint varnish-C2)>
50.0 parts of amine-modified polyester acrylate, 40.0 parts of EO-modified trimethylolpropane triacrylate and 10.0 parts of 1-hydroxy-cyclohexyl-phenyl-ketone were mixed and dissolved using a mixer. The viscosity was adjusted to about 35 seconds with the Zahn cup viscosity (# 4).

  In addition, as an average particle diameter measuring method, it computed from the situation of the frequency distribution measured using Hitachi, Ltd. operation type electron microscope S-3400N.

<Preparation of printed matter of the present invention>
A printed product of all sizes A was produced using a Roland 700 printing machine, and the repelling effect, the soft and moist touch effect due to the overprinting layer, and the ability to stack bars, which are important in printing operations, were confirmed. First, after printing the black solid part shown in (Dicure Avirio Process Ink) made by DIC Graphics as a color ink for underprinting using a printing unit, use a UV lamp between cylinders. Cured. Then, the underprint layer was printed in-line using a printing unit as shown in (Fig. 3), and the aqueous UV-type overprint varnish or UV-curable embossed clear was left uncured using the coater of the printing machine (Fig. The coating was performed as shown in 4). One air-cooled 120 w / cm metal halide lamp was used for the in-body UV lamp, and two air-cooled 120 w / cm metal halide lamps were used for the delivery UV lamp.
The printing speed was 8,000 sheets / hour. As the anilox roller used in the coater unit when the top coat layer is applied, a roller having 200 lines / inch and a cell volume of 13.0 g was used. UV orange (manufactured by DAY) was used as a blanket to be attached to a printing unit used for transferring a black ink image for underprinting and a varnish portion for underprinting. The aqueous UV curable overprint varnish was coated at room temperature. The UV curable embossed clear was coated by heating the liquid temperature to 40 ° C. As the dampening solution H, Solya 507 (manufactured by Koyo Chemical Co., Ltd.) was used at a concentration of 2% diluted with tap water. The paper used was OK topcoat + (57.5 kg / A total). The number of printed sheets was 4,000.

<Evaluation method>
(Evaluation method for printed matter 1: Measurement of dynamic friction coefficient)
The measurement of the dynamic friction coefficient conforms to ASTM D1894-90 (test conditions for measuring the friction coefficient of plastic films and sheets when sliding on the same material or other materials), and uses an apparatus manufactured by Stable MicroSystems. And measured.
The contact surface was 63.5 mm × 63.5 mm, the load was 200 g, the surface was felt at the standard equipment, and the pulling speed was 2 mm / s and 20 mm / s.
The calculation method of the rate of increase in the dynamic friction coefficient was 100 × (dynamic friction coefficient at 20 mm / s−2 mm / s dynamic friction coefficient) / 2 mm / hour. In addition, the measurement place of printed matter was made into the code | symbol 7 shown in the smooth part (FIG. 1) which an undercoat and an overcoat do not overlap.
In addition, the solid part of the printed matter with the underlying UV ink and the overprint layer with the aqueous UV curable overprint varnish overlap (7), the non-image area of the printed matter and the overprint with the aqueous UV curable overprint varnish. Since there was no difference in the coefficient of dynamic friction between the layer overlapping part (symbol 6) at 20 mm / s and 2 mm / s, the solid part of the printed matter with UV ink and the aqueous UV curable overprint The part where the overprint layer by the varnish overlaps (symbol 7) was taken as the measurement location.

(Method 2 for evaluating printed matter: moist feel)
As an evaluation of the touch feeling of the printed matter of the present invention, the subject used an evaluation method based on a questionnaire survey with respect to 10 employees who are not related to the present study with respect to only the topcoat layer portion where no undercoat layer exists. The subjects touched the coated surface with their hands and fingers, and counted how many out of 10 people felt the “moist soft touch”, and used this as an evaluation standard.
A: 10 out of 10 people felt moist.
○: 7-9 people out of 10 felt moist.
Δ: 3 to 6 out of 10 felt moist.
X: Among the 10 people, 0 to 2 felt moist.

(Evaluation method 3 of printed matter: repellent property of topcoat layer by undercoat layer)
The repellent quality of the topcoat layer by the undercoat layer was visually evaluated.
(Double-circle): The repelling effect is fully demonstrated.
○: The repelling effect is exerted.
Δ: A repelling effect is observed, but it cannot be said to be sufficient.
X: No repelling effect is observed.

(Method 4 for evaluating printed matter: designability)
The difference in contrast between the semi-matt portion where the undercoat layer and the overcoat layer overlap and the mat portion due to the overcoat layer without the undercoat layer was visually evaluated, and the stronger the contrast, the better the design.
(Double-circle): The design property is very high by clear contrast.
○: Contrast and design.
Δ: Slightly insufficient contrast and designability is not sufficient.
X: Almost no contrast and no design effect.

(Evaluation method 5 for printed materials: suitability for bar stacking)
Bar stackability, which is important for handling during printing, was determined by the presence or absence of peeling sound when the front and back of the printed matter at the bottom of the bar stack was peeled off immediately after printing.
A: There is no peeling sound.
○: Slight peeling noise
Δ: Clear peeling sound
X: Not peeled off.

  Table 2 shows the configuration of the printed matter for evaluation and its evaluation results in Examples 1 to 6 and Comparative Examples 1 to 3.

The printed matter of the present invention shown in the examples includes a semi-matt portion (a portion that does not completely reach the mat portion) generated by fine unevenness due to a sufficient repelling effect in the portion where the underprint layer and the overprint layer overlap, and the presence of the underprint layer By forming a matte part with a soft and soft hand feeling of the overprinting layer that is not overprinted, it exerts a design effect from both visual and touch aspects, has good stackability, and excellent handling characteristics.
In Comparative Examples 1 and 2 using general UV-curable emboss clears (C1) and (C2), a moist feel is not obtained, and the unique design aimed by the present application cannot be obtained.
In Comparative Example 3 using the oxidation polymerization type oily underprint varnish (D2), the repellency effect of the undercoat layer is not sufficient, and since the drying property is inferior, the rod stackability is also inferior.

  The printed matter of the present invention is used for packaging and packaging of sanitary, cosmetics, pharmaceuticals, audio appliances, etc. in addition to various advertising materials such as posters, pamphlets, book covers and other publications, maps, etc. that require high design. Can be widely deployed.

1 Paper OK Top Coat (57.5Kg / A all sizes) that is a printing substrate
2 Solid part with UV curable ink 3 Undercoat layer application part with UV curable underprint varnish 4 Overprint layer application part with aqueous UV curable overprint varnish 5 Semi-matte part where the undercoat layer overlaps with the overcoat layer
6 By non-image area of printed matter and aqueous UV curable overprint varnish
The part where the overprint layer overlaps (mat part)
7 With solid part of printed matter and aqueous UV curable overprint varnish
The part where the overprint layer overlaps (mat part), the part where the dynamic friction coefficient is measured

Claims (6)

On the substrate, a printing layer using an ultraviolet curable ink is provided, and on the surface of the substrate and the printing layer, a partial or entire surface is provided with an underprint layer by an ultraviolet curable underprint varnish,
On the base material, the printing layer, and the underprinting layer, an overprinting layer with an aqueous UV curable overprint varnish is provided on the entire surface, and the portion where the underprinting layer and the overprinting layer overlap is the overprinting layer is becomes granular or uneven by repelling, non-overlapping portion is a printed materials that form a continuous coating,
The aqueous ultraviolet curable overprint varnish is a composition containing a urethane resin, an ultraviolet curable monomer containing a water-soluble (meth) acrylate, and water,
The mass ratio of the urethane resin and the ultraviolet curable monomer is
Urethane resin: UV curable monomer = 1: 2 to 2: 1 (mass ratio),
Furthermore, the dynamic friction coefficient of the dry coated surface of the smooth portion where the undercoat layer and the overcoat layer after the aqueous UV curable overprint varnish coating do not overlap is 0.1 to 0.7,
A printed matter, wherein the rate of increase in the coefficient of dynamic friction when the measurement speed is increased from 2 mm / s to 20 mm / s is 10% or more.
The printed matter according to claim 1 , wherein an average particle diameter of the urethane resin is in a range of 0.1 to 10 µm.
The printed matter according to claim 1 or 2 , wherein the urethane resin has a glass transition point (Tg) by DSC thermal analysis of -90 ° C to -70 ° C.
As the ultraviolet curable monomer, any further water-insoluble (meth) acrylate, of claims 1 to 3 using aqueous UV-curable overprint varnish containing 0.05 to 15 wt% in terms of solid content, excluding water The printed matter according to any one of the above.
The method for producing a printed matter according to any one of claims 1 to 4 , wherein after the printing layer and the underprinting layer are provided on the substrate, the overprinting layer is continuously provided in-line.
A map using the method for producing printed matter according to claim 5 .

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