A printing device and printing method for multi-layer convex-concave offset printing simulation

Abstract

The present invention relates to a printing device and a printing method for multi-layer embossed offset printing simulation. The device comprises: a paper feeding unit for inputting printed matter to be printed; a plurality of printing groups for printing ink on paper; an oiling seat for printing UV varnish on the ink; a drying mechanism for curing the UV varnish and the ink to form a embossed offset printing simulation effect; and a paper collecting unit for collecting the printed matter. The printing method comprises the following steps: printing a layer of base oil on the surface of the printed matter; printing a layer of shrink oil on the base oil where a embossed effect is required; superimposing another layer of shrink oil on the shrink oil, and partially drying it by a UV lamp; superimposing the UV varnish on the shrink oil, and curing it by the drying mechanism, so that a embossed offset printing effect is formed on the surface of the printed matter. Compared with the prior art, in the present invention, the shrink oil is printed twice on the base oil where a embossed effect is required; the amount and thickness of the oil can be increased, and partial curing is performed first, so that the embossed printing effect is more obvious.

Description

Technical Field

[0001] The invention relates to the field of offset printing, and in particular to a printing device and a printing method for multi-layer convex-concave offset printing simulation. Background Art

[0002] Concave and convex embossing, also known as embossing, is a special processing technology in the surface decoration of printed products. It uses concave and convex molds to cause plastic deformation of the printed product substrate under a certain pressure, thereby performing artistic processing on the printed product surface. The various convex images and patterns embossed show different depths of patterns, which enhance the three-dimensional sense and artistic appeal of the printed product, and are suitable for printing high-quality and expensive printed products. With the rapid development of science and technology, today we can also use 3D printing methods on computers to directly achieve "on-demand printing" with small batches and high pixel requirements on printed products.

[0003] The traditional process in the industry is to make a mold according to customer requirements, and then install the mold on the post-processing equipment after printing to achieve a pattern consistent with the mold on the surface of the printed product through a certain pressure. The advantages of this process are high precision, strong three-dimensional sense and artistic appeal; Disadvantages: low production efficiency (500-2000 sheets per hour); high mold cost. There are also some 3D printing in the market. After printing, it is printed on demand according to the pattern required by the customer through digital equipment. Disadvantages: high cost, 0.6-1.5 yuan per processing, suitable for short orders within 1,000 sheets; currently not fine enough, the thinnest line is 0.15mm or above to be stable. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-layer embossed offset printing simulation printing device and printing method in order to overcome at least one of the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A printing device for multi-layer convex-concave offset printing simulation, the device comprising:

[0007] A paper feeding unit, used for inputting printed matter to be printed;

[0008] multiple printing groups for printing ink on paper;

[0009] Oiling seat, used for printing UV varnish on ink;

[0010] Drying mechanism, used to cure UV varnish and ink to form convex and concave offset printing simulation effect;

[0011] The paper collection unit is used to collect the printed materials.

[0012] Furthermore, the printing group at least includes:

[0013] A printing group, used for printing base oil;

[0014] The B printing group and the C printing group are used for printing shrink oil.

[0015] Furthermore, a UV lamp is provided between the C printing group and the oiling seat.

[0016] A printing method based on the above-mentioned multi-layer convex-concave offset printing simulation printing device, the method comprising the following steps:

[0017] A layer of primer is printed on the surface of the printed matter. First, it protects the printed matter; second, it reduces the degree to which the subsequent printed oil is absorbed by the paper.

[0018] Print a layer of shrinkage oil on the base oil where the concave and convex effect is needed;

[0019] Adding another layer of shrink oil on top of the shrink oil can increase the amount and thickness of the oil, and partially dry it through a UV lamp to form fine particles on the surface of the printed matter;

[0020] The UV varnish is superimposed on the shrink oil and solidified by the drying mechanism, so that the surface of the printed matter forms a convex and concave offset printing effect.

[0021] Furthermore, the base oil comprises the following components in percentage by mass: 52-70% of resin, 7-23% of monomer, 5-18% of photoinitiator, 1-2% of auxiliary agent and 5-14% of filler.

[0022] Further, the resin comprises 40-50% of polyacrylic acid resin and 12-20% of a polymer of dimethyl 1,3-phthalate, dimethyl-1,4-phthalate and 1,2-ethylene glycol;

[0023] The monomers include 4-12% of dipropylene glycol diacrylate and 3-11% of propane trimethylol triacrylate;

[0024] The photoinitiator includes 2-6% of 1-hydroxy-cyclohexyl-phenyl ketone, 1-4% of 2,4-diethylthiazolone, 1-4% of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone and 1-4% of 1-(biphenyl-4-yl)-2-methyl-2-morpholinopropane-1-one;

[0025] The filler comprises 5-10% talc, 0-2% bentonite and 0-2% polyvinyl chloride;

[0026] The auxiliary agent includes polyethylene.

[0027] Furthermore, the shrink oil comprises the following components in mass percentage: 15-25% prepolymer, 5-15% polymer resin, 20-30% acrylic monomer A, 10-20% acrylic monomer B, 2-5% photoinitiator, 0-5% co-initiator, 5-20% talc and 1-5% auxiliary agent.

[0028] Furthermore, the UV varnish comprises the following components in percentage by mass: 50-55% of polyacrylic acid resin, 15-20% of ethoxylated trimethylolpropane triacrylate, 10-17% of dipropylene glycol diacrylate and 3-8% of ethyl trimethylbenzoylphosphonate.

[0029] Furthermore, the amount of primer applied is 1.5-2.5 g / m 2 The line width of group B shrink oil is 0.1-0.15mm, the distance between the lines is 0.3-0.4mm, the line width of group C shrink oil is 0.08-0.12mm, the distance between the lines is 0.3-0.4mm, and the amount of UV varnish applied is 4-5g / m 2 .

[0030] Furthermore, the wavelength of the UV lamp is selected to be in the range of 320-400nm.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] (1) In the present invention, a layer of primer is printed on the surface of the printed matter; firstly, it protects the printed matter; secondly, it reduces the degree to which the subsequent printed oil is absorbed by the paper;

[0033] (2) In the present invention, the shrinkage oil is printed twice on the base oil to achieve the concave-convex effect; the amount and thickness of the oil can be increased, and partial curing can be performed first to make the convex printing effect more obvious;

[0034] (3) In the present invention, the best effect can be achieved by controlling the thickness of the concave-convex effect lines and the amount of oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a printing device in an embodiment;

[0036] Figure 2 This is a schematic diagram of the printing effect in the embodiment;

[0037] Figure 3 It is a schematic diagram of the effect after curing in the embodiment. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0039] Example

[0040] The multi-layer printing method simulates the concave and convex effect. The printing method simulates the concave and convex effect through three printing seats of printing group A, B, and C, and then adds the oil seat. Figure 1 , the specific steps are as follows:

[0041] The A-group printing base first prints a layer of primer on the surface of the printed matter. The mixture mainly contains resin, monomer, photoinitiator, additive, and filler. The first is to protect the printed matter; the second is to reduce the absorption of the subsequent printed oil by the paper. The main ingredients of the primer are as follows:

[0042]

[0043] The B group printing base is printed with a layer of shrinkage oil where the concave and convex effect is needed. The mixture mainly contains: prepolymer, polymer resin, acrylic monomer A, acrylic monomer B, photoinitiator, co-initiator, talcum powder, and additives. See the table below for details; the C group printing base is the same as the B group, and another layer of oil is superimposed to increase the amount and thickness of the oil. After drying with a UV lamp, the wavelength of the UV lamp is selected in the range of 320-400nm, and fine particles are formed on the surface of the printed matter.

[0044] Chemical name content% category CAS No. Prepolymer 15～25 Resin Non-public Polymer resin 5～15 Resin Non-public Acrylic A 20～30 monomer Non-public Acrylic acid monomer B 10～20 monomer 94108-97-1 Photoinitiator 2～5 Initiator 71868-10-5 Co-initiator 0～5 Co-initiator Various types talcum powder 5～20 filler Various types Additives 1～5 filler Various types

[0045] like Figure 2 When the printed matter reaches the oiling seat, the UV varnish used in the oiling seat mainly contains polyacrylic resin, ethoxylated trimethylolpropane triacrylate, dipropylene glycol diacrylate, and trimethylbenzoylphosphonic acid ethyl ester, as shown in the following table. It will quickly form a shrinkage state when it is superimposed on the oil of the B and C printing groups. The UV lamp wavelength is selected from the 320-400nm range through the UV drying system of the printing press. After curing, a convex-concave effect with a height of about 0.04-0.1mm will be produced on the surface of the printed matter. Figure 3 .

[0046]

[0047] Among them, in order to achieve the best effect, Group A first prints a layer of UV primer on the surface of the printed matter, about 2g / square meter, Group B has the best width of the second layer of lines at 0.13mm, with a middle interval of 0.35mm; Group C has the best width of the third layer of lines at 0.1mm, with a middle interval of 0.38mm; the UV varnish on the oil-passing seat uses an 80-line twill anilox roller, about 4.8g / square meter.

[0048] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A printing method based on a multi-layer convex-concave offset printing simulation printing device, characterized in that: The printing device for multi-layer embossing offset printing simulation comprises: A paper feeding unit, used for inputting printed matter to be printed; multiple printing groups for printing ink on paper; Oiling seat, used for printing UV varnish on ink; Drying mechanism, used to cure UV varnish and ink to form convex and concave offset printing simulation effect; A paper collection unit is used to collect the printed materials; The printing group at least includes: A printing group, used for printing base oil; Printing group B and printing group C are used for printing shrink oil; A UV lamp is provided between the C printing group and the oiling seat; The method comprises the following steps: Print a layer of primer on the surface of the printed matter; Print a layer of shrinkage oil on the base oil where the concave and convex effect is needed; A layer of shrink oil is superimposed on the shrink oil and partially dried by UV lamp to form fine particles on the surface of the printed matter; The UV varnish is superimposed on the shrink oil and solidified by the drying mechanism to form a convex-concave offset printing effect on the surface of the printed matter. The base oil comprises the following components in percentage by weight: 52-70% of resin, 7-23% of monomer, 5-18% of photoinitiator, 1-2% of auxiliary agent and 5-14% of filler, wherein the resin comprises 40-50% of polyacrylic resin and 12-20% of polymer of dimethyl 1,3-phthalate, dimethyl-1,4-phthalate and 1,2-ethylene glycol; The monomers include 4-12% of dipropylene glycol diacrylate and 3-11% of propane trimethylol triacrylate; The photoinitiator includes 2-6% of 1-hydroxy-cyclohexyl-phenyl ketone, 1-4% of 2,4-diethylthiazolone, 1-4% of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone and 1-4% of 1-(biphenyl-4-yl)-2-methyl-2-morpholinopropane-1-one; The filler comprises 5-10% talc, 0-2% bentonite and 0-2% polyvinyl chloride; The auxiliary agent includes polyethylene; The amount of primer applied is 1.5-2.5 g / m 2 The line width of group B shrink oil is 0.1-0.15mm, the distance between the lines is 0.3-0.4mm, the line width of group C shrink oil is 0.08-0.12mm, the distance between the lines is 0.3-0.4mm, and the amount of UV varnish applied is 4-5g / m 2 .

2. A multi-layer embossing offset printing simulation printing method according to claim 1, characterized in that: The shrink oil comprises the following components in percentage by mass: 15-25% prepolymer, 5-15% polymer resin, 20-30% acrylic monomer A, 10-20% acrylic monomer B, 2-5% photoinitiator, 0-5% auxiliary initiator, 5-20% talc and 1-5% auxiliary agent.

3. A multi-layer embossing offset printing simulation printing method according to claim 1, characterized in that: The UV varnish comprises the following components in percentage by mass: 50-55% of polyacrylic acid resin, 15-20% of ethoxylated trimethylolpropane triacrylate, 10-17% of dipropylene glycol diacrylate and 3-8% of ethyl trimethylbenzoylphosphonate.

4. The multi-layer embossing offset printing simulation printing method according to claim 1, characterized in that: The wavelength of the UV lamp is selected from the range of 320-400nm.

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