JP2008055763A - Manufacturing method of spot-coated printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, for obtaining the same effect as when a spot coating is applied, which can dispense with the use of a resin printing plate or a gravure printing plate meant for spot coating, in a coater part, and adopts an operation to partly print an oily offset varnish by a printing cylinder of an offset printing machine and apply a coating layer of aqueous varnish to all over the surface of the offset varnish with the help of a variety of coaters etc., in case offset printd matter is spot-coated, and the printer matter obtained by this method. <P>SOLUTION: A primary printing layer is formed by applying an oily varnish partly or entirely on a base which may be printed by offset printing. The oily varnish for forming the primary printing layer contains a liquid-repellent component, and a top printing layer is formed by applying the aqueous varnish to the surface of the base and the primary printing layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, an oil-based varnish partially containing a liquid repellent component is printed on a substrate by an offset printing machine (this oil-based varnish layer is also referred to as an underprint layer), and an inline attached to the offset printing machine Apply a transparent varnish or colored varnish colored with pearl, gold, silver or other colors (hereinafter referred to as aqueous varnish) as an overprinting layer on the entire surface with a coater or various offline coaters. The present invention relates to a method for producing a printed matter in which a portion that is not repelled by a printed layer has the effect of being spot-coated, and a printed matter by the method.

For the purpose of enhancing the cosmetics of the printed material, a coating for glazing or matting may be performed partially or entirely on the surface of the printed material.
In order to perform partial coating (referred to as spot coating), a resin plate or a gravure plate is used.
As the coater, an in-line coater attached to a printing machine and capable of continuously performing printing and coating, an offline coater for performing a coating operation separately from printing, and the like are used.

Patent Document 1 describes an invention of an aqueous varnish composition used for polishing a printed paper. This varnish is applied by a coating method such as offset inline method, gravure printing method, flexographic printing method, roll coating method, etc., and then called press processing, which is a process that increases the surface smoothness by heat-pressing the press plate after coating. Is done.
Patent Document 2 describes a processing method for performing pattern coating (same meaning as spot coating) using a photosensitive resin relief plate. Compared to the conventional method of making a plate by manually cutting a rubber blanket, it is said that the plate can be made with high accuracy even for a complicated pattern because the plate making is performed by a photographic method.
Non-Patent Document 1 describes a photosensitive resin relief plate suitable for pattern coating (same meaning as spot coating).

It is known that the coating method using the gravure plate or the resin relief plate has the following problems.
B) The plate material is expensive.
B) Registration of the part to be applied according to the pattern (precise positioning of the part to be coated) is required.
C) Resin letterpress requires special plate making technology in consideration of plate elongation.
D) The varnish gradually gathers at the edge of the convex part, and a marginal zone (the varnish of the edge part becomes thick and the varnish protrudes to the periphery) is likely to occur.
E) The varnish tends to scatter from the edge of the plate.
F) In the case of a gravure plate, varnish swimming (a phenomenon in which fine coating unevenness of the varnish occurs when the gravure plate is transferred to the printed matter, resulting in unevenness in the varnish coating and a uniform coating cannot be obtained) occurs. Easy to do.

JP-A-62-282095 JP 2003-341003 A Hiroshi Nakagoe, “Pattern coating suitability of photosensitive resin letterpress”, Monthly Carton Box, Nikkan Ib, Inc., January 1991, pages 155-158

  Conventionally, when high-precision spot coating is performed using an offset inline coater or an offline coater, it is necessary to use a gravure plate or a resin relief plate as described above. In this case, there are problems such as costs for the plate material and preparation thereof, difficulty in registering the applied portions, generation of marginal zones, scattering of varnishes, swimming, and the like.

  The present invention partially prints an oil-based offset varnish with a printing cylinder of an offset printing machine, and coats the entire surface with an aqueous varnish by various coaters such as an offset inline coater or an offline coater. It is an object of the present invention to provide a method capable of obtaining an effect equivalent to that of the above case and a printed matter by the method.

  As a result of intensive studies to solve the problem of spot coating using a gravure plate or a resin relief plate, the inventors have performed offset printing with an oily varnish having liquid repellency as a base, and a water-based coating thereon. It was found that when the entire surface of the varnish was coated, the same effect as that obtained when spot coating was applied to the portion not repelled by the base varnish was completed. Since the base varnish is offset printed using a lithographic plate, the plate is easy and inexpensive to produce, and even a precise coating pattern can be easily produced.

That is, in the printed matter of the present invention, an oil-based varnish is provided on a substrate which may be printed partially or entirely by applying an oil-based varnish by offset printing to provide an underprint layer, and the oil-based varnish for forming the underprint layer is repellent. It contains a liquid component, and is prepared by coating an aqueous varnish on the surface of the substrate and the underprinting layer to provide an overprinting layer.
The portion of the overprinting layer that overlaps the underprinting layer becomes fine particles by repelling and is scattered on the underprinting layer, and the other portions of the overprinting layer form a continuous film.
The oil-based varnish for forming the underprint layer contains one or more selected from the group consisting of petroleum waxes, animal and vegetable waxes, synthetic waxes, silicone waxes, and fluorine waxes as liquid repellent components. Preferably used.

  In the case of performing spot coating processing with an aqueous varnish on an offset printed matter, it is not necessary to use a resin plate or a gravure plate for spot coating in the coater portion when using either an inline coater or an offline coater.

  Since the portion that repels the aqueous varnish is determined by an offset printing plate (PS plate or the like), an ordinary blanket or solid resin plate can be used for the varnish cylinder in the inline coater. In the offline coater, a solid flexo plate can be used for a general roll coater and a flexo coater, and a solid gravure plate can be used for a gravure coater. This eliminates the need to make expensive flexographic plates and gravure plates for each printed matter.

  Furthermore, since the registration of the coated portion is possible on the printing cylinder side, it can be performed accurately and easily. Also, the occurrence of marginal zones, varnish scattering from the plate edge, and swimming by gravure plates are eliminated.

For example, if a mat type is used for the underprint varnish printed on the printing cylinder and a gloss type is used for the overprint varnish printed on the coater, it is possible to separate the mat portion and the gloss portion on the same printing surface, depending on the gloss contrast. A cosmetic effect can be obtained.
Further, when a colored varnish such as pearl is applied to the entire surface with a coater as an overprinting layer by the method of the present invention, the effect is that the varnish is repelled in the underprinting varnish portion and only the other portions are colored. Is obtained.

Paper is preferable as the substrate for performing the spot coating process of the present invention, and may be printed. It is particularly suitable for applications where spot coating is performed according to the printed pattern.
The liquid repellent component contained in the oil-based varnish that forms the underprint layer includes petroleum wax (eg, microcrystalline, paraffin, petrolatum, etc.), animal and vegetable wax (eg, beeswax, shellac wax, carnauba wax, rice) Wax, candelilla wax, Japan wax, etc.), synthetic wax (eg, polyethylene, polypropylene, stearic acid, etc.), silicon, fluorine, etc. can be used. These waxes can be used alone or in combination of two or more.

  More specifically, the above-mentioned waxes are preferably microcrystalline and paraffinic among petroleum waxes, carnauba wax among animal and plant waxes, and polyethylene and polypropylene types among synthetic waxes.

The addition amount of the liquid repellent component is preferably 1 to 20% in the total amount of oily varnish for petroleum wax, animal and plant wax and synthetic wax, and preferably 0.2 to 10% for silicon wax and fluorine wax.
When the addition amount of the liquid repellent component is less than the above range, the liquid repellent effect of the overprint varnish cannot be obtained sufficiently. Further, when the above range is exceeded, there are problems such that viscosity suitable for printing cannot be maintained, emulsification balance cannot be maintained on the PS plate of the printing press, or wax components accumulate on the PS plate or the blanket. As a result, the offset printing suitability cannot be ensured.

In order to obtain various cosmetic effects other than spot coating, an aqueous varnish other than the high gloss type (eg, mat type, press working type, coloring type, etc.) can be used as the overprinting layer.
Aqueous varnish differs in composition, blending, and the like of the resin (emulsion, water-soluble resin), surfactant, solvent, colorant, and other various additives used for each purpose. Thereby, the viscosity, surface tension, transferability, leveling property and the like of the aqueous varnish are also different.

In order to give the oil-based offset varnish of the underprinting layer versatility to the overprinting layer so that the spot coating effect which is the effect of the present invention can be sufficiently obtained for the aqueous varnish having various characteristics as described above. It is effective to use a plurality of types of wax as the liquid repellent component.
As a result of various experiments, it was found that the following four types of waxes a) to d) were used in combination as the liquid repellent material for the oil-based varnish for the underprint layer, and contained in the respective proportions. All ratios are based on mass.
a) Among petroleum waxes, 1 to 10% of paraffin wax having a molecular weight of 400 to 3000 and a softening point of 60 to 150 ° C.
b) Among synthetic waxes, 1 to 6% polyethylene wax having a molecular weight of 2000 to 8000 and a softening point of 80 to 180 ° C.
c) 0.5-4% of fluorine-based wax.
d) 1 to 5% of silicon wax.

  As a result of further examination of the effect and cost of spot coating, the wax in the oil-based varnish for the underprint layer is 3 to 7% paraffin wax, 1 to 4% polyethylene wax, 0.8 to fluorine wax. It was found that it is more preferable to use 3% and silicon wax in the range of 2 to 4%.

  The present invention will be specifically described below based on examples. First, the underprint varnish (1-6) used in common in the following (Example-1) and (Example-2) was adjusted. In the present specification, “part” and “%” are based on mass unless otherwise specified.

(1) Varnish as base for preparation of various underprint varnishes In order to examine the effect of the liquid repellent component in the oil-based offset printing varnish, the following commercially available varnish was selected. As shown below, various lyophobic components are added to this varnish for testing.
Product name: Calton Self GW Varnish (Dainippon Ink Chemical Co., Ltd.)
This varnish consists of rosin-modified phenolic resin varnish, polymerized linseed oil, light oil and auxiliary agents (dryers, film reinforcing agents, etc.).

(2) Preparation of various underprint varnishes <Underprint test varnish-1 (no liquid repellent component added)>
Calton Self GW Varnish ... 100 parts.
<Underprint test varnish-2>
Carton Self GW Varnish ... 96 parts
Solid paraffin wax (petroleum wax, molecular weight 800, softening point 108 ° C.) 4 parts, total 100 parts.
<Underprint test varnish-3>
Calton Self GW Varnish ... 98 parts,
Polyethylene wax (synthetic wax, molecular weight 4000, softening point 128 ° C.) 2 parts, total 100 parts.
<Underprint test varnish-4>
Calton Self GW Varnish ... 98 parts,
Polytetrafluoroethylene wax (fluorine wax) 2 parts, total 100 parts.
<Underprint test varnish-5>
Carton Self GW Varnish ... 97%,
Polydimethylsiloxane (silicone wax): 3 parts, 100 parts in total.
<Underprint test varnish-6>
Calton Self GW Varnish ... 89 parts,
Solid paraffin wax (petroleum wax) ... 4 parts,
2 parts polyethylene wax (synthetic wax)
Polytetrafluoroethylene wax (fluorine wax) 2 parts,
Polydimethylsiloxane (silicone wax): 3 parts, 100 parts in total.

(Example-1)
As the overprint varnish, the following commercially available aqueous varnish was selected.
Product name: Hydris 2255R (Dainippon Ink Chemical Co., Ltd.).
The varnish is composed of styrene / acrylic resin (emulsion, water-soluble resin), water and auxiliary agents (film-forming auxiliary, antifoaming agent, wetting agent, film reinforcing agent, etc.).

(3) Printing test in Example-1 An R-702LTLV type offset printing machine (with an inline coater) manufactured by Roland Corporation was used. The first cylinder was printed with black ink, the second cylinder was printed with the above-mentioned underprint test varnishes 1 to 5, and the above-mentioned overprint varnish was applied with an in-line coater.
Paper: OK top coat + (Oji Paper Co., Ltd.) 57.5Kg, A complete.
Ink: Space Color Fusion G Process Black N (Dainippon Ink Chemical Co., Ltd.)
Plate: In the vertical direction, a) non-image area, b) black, c) black + underprint test varnish (with some halftone dots) and d) underprint test varnish.
That is, the finished printed matter has (a) a portion where only the overprint varnish is applied to plain paper above (b) a portion where only the overprint varnish is applied on top of the black ink, C) Further, there is a portion where the underprint varnish and the overprint varnish are overprinted on the black ink, and (d) a portion where the underprint varnish and the overprint varnish are overprinted on plain paper at the bottom. .
In (c), there are a portion where the underprint varnish is printed solid and a portion where the halftone dot is printed.
Inline coater ... The type is a chamber coater.
The viscosity of the overprint varnish (Hydris 2255R) was 16 seconds (25 ° C.) with Zahn cup # 4. Diluent is water.
Anilox roll is 13cc / cm2.
The varnish plate is a solid resin pattern (Syrel 45NOW: manufactured by DuPont). Printing pressure is 0.03mm (between resin plate / impression cylinder)
For drying, an infrared lamp and a hot air dryer were used in combination.
In addition, Example-1 assumes the in-line process in wet (coating an overprint varnish before printing ink and underprint varnish dries).

(4) Results of Example-1 Underprinting test varnish and overprinting aqueous varnish were overprinted under the above conditions, and the spot coating effect due to the repellency phenomenon of the overprinting varnish portion of the underprinting test varnish was evaluated.

(5) Description of Evaluation Method in Table 1 In the solid portion of the underprint test varnish in (c) above, the aqueous varnish applied on top is repelled to become a matte tone.
The surface of the overprinting aqueous varnish is uniformly repelled and the varnish film is scattered in the form of particles, and it is a uniform uneven film. The overprinted aqueous varnish is incompletely repelled and the uneven film is not uniform. A case where the overprinted aqueous varnish was not repelled or a small amount of crater-like holes scattered in the aqueous varnish film was rated as x.
The halftone dot part of the varnish for underprinting test in (c) is still matte because the aqueous varnish applied on top is repelled, but the film of the overprinting aqueous varnish remains in comparison with the solid part, so glossiness The remaining matte tone.
○, the overprinted water-based varnish is completely repelled in the halftone dot printing part of the underprinted varnish, and the halftone dot can be confirmed, and the overprinted water-based varnish is repelled incompletely and the halftone dot is partially crushed The case where the overprinting aqueous varnish was not repelled and the halftone dots could not be identified was marked with x.
For practical use, a value of Δ or more is acceptable.
As can be seen from Table 1, in the printed matter using the underprint test varnishes 2 to 6 of the present invention, the overprint varnish was satisfactorily repelled in both the solid and halftone portions, and the effect of spot coating was clearly obtained. .

(Example-2)
(6) As the overprint varnish, the following commercially available aqueous varnish was selected.
Product name: Hydris 2012 Pearl (manufactured by Dainippon Ink & Chemicals, Inc.).
This varnish consists of styrene / acrylic resin (emulsion, water-soluble resin), water, pearl pigment, and auxiliary agents (film-forming auxiliary, antifoaming agent, wetting agent, film reinforcing agent, etc.).

(7) Printed matter used in Example-2 In the preparation of (Example-1), a printed matter (ink ink, printed matter of only the varnish for underprinting test 1 to 5) not coated with an overprint varnish was saved. After the ink and underprint varnish were dried, they were used in this test (Example-2).
In addition, Example-2 assumes the off-line process in dry (after printing ink and underprint varnish dries, it coats overprint varnish with another process).

(8) Coating conditions coater of Hydris 2012 pearl in Example-2: offline roll coater (SP type thick paper surface coating machine, manufactured by Hamamatsu Seisakusho Co., Ltd.).
The varnish is applied to the entire surface of the printed material using the coater.
The viscosity is 11 seconds (25 ° C.) with Zahn Cup # 4. As a diluent, a commercially available “Dick Safe Quick Drying Agent # 1 (Dainippon Ink Chemical Co., Ltd.)” and water were used in a 1: 2 blend. For drying, a hot air dryer was used.
(9) Results of Example-2 About the Hydris 2012 pearl applied under the above conditions, the spot coating effect due to the repellency phenomenon of the varnish part for the underprint test was evaluated.

(10) Description of Evaluation Method in Table 2 The overprint varnish is repelled in the solid portion of the underprint test varnish in (c).
The overprint varnish is repelled uniformly to form fine particles, and the underprint varnish surface is clearly visible ○, the overprint varnish is repelled incompletely and the pearl is partially confirmed △, The case where the printed varnish was not repelled and the pearl could be confirmed on the entire surface was rated as x.
The halftone dot portion of the varnish for underprinting test in (c) is still repelled by the overprinting varnish, but the underprinting varnish appears, but the overprinting varnish film remains in comparison with the solid part, resulting in a shadowy pearl tone. .
The one where the overprint varnish is completely repelled at the halftone dot printing portion of the underprint varnish and the halftone dot can be confirmed, ◯, the one where the overprint varnish is repelled incompletely and part of the halftone dot is crushed, The case where the overprint varnish was not repelled and the halftone dot could not be identified was marked as x.
As can be seen from Table 2, in the printed matter using the underprint test varnishes 2 to 6 of the present invention, the overprint varnish was satisfactorily repelled in both the solid and halftone portions, and the effect of spot coating was clearly obtained. .

The spot-coated printed material of the present invention does not require the use of a resin relief plate or gravure plate for spot coating in the coater process when performing the spot coating processing, and has a fine and accurate spot coating effect by a simple method. can get.

Claims (4)

On a substrate that may be printed,
Apply an oil-based varnish partially or entirely by offset printing to provide an underprint layer,
The oily varnish for forming the underprint layer contains a liquid repellent component,
An overprinting layer is provided by coating an aqueous varnish with an inline coater attached to an offset printing machine or various offline coaters on the surface of the base material and the underprinting layer,
The portions of the overprinting layer that overlap with the underprinting layer are scattered as fine particles by repelling,
The other overprinting layer is a method for producing a printed matter in which a continuous film is formed.   The oily varnish forming the underprint layer contains at least one selected from the group consisting of petroleum waxes, animal and vegetable waxes, synthetic waxes, silicon waxes and fluorine waxes as a liquid repellent component. A method for producing the printed matter described above.   The oil-based varnish forming the underprint layer is in the range of 3 to 7% of paraffin wax, 1 to 4% of polyethylene wax, 0.8 to 3% of fluorine wax and 2 to 4% of silicon wax. The method for producing a printed material according to claim 1, wherein the printed material is used in combination. A printed matter produced by the method according to claim 1.