阅读说明：本技术 一种数码印刷机用张式纸张用清漆及其制备工艺和应用方法 (Varnish for sheet-type paper for digital printing machine and preparation process and application method thereof ) 是由 王志东 叶洪球 于 2019-09-12 设计创作，主要内容包括：本发明涉及数码印刷技术领域,具体涉及一种数码印刷机用张式纸张用清漆及其制备工艺和应用方法。该数码印刷机用张式纸张用清漆,包括水性丙烯酸、水、乙醇和氨水。其中,该清漆主要成份是水,外观为乳白色,pH在8.0～10.0。该清漆涂布在纸张表面能使后道印刷可以直接数码印刷,并且使用量很少,且不含有干酷素,生产成本低,并且具有保色不泛黄,印刷性能良好,不粘辊,环保性好的优点。该数码印刷机用张式纸张用清漆的制备工艺,具有工艺简单,生产成本低,并能够适合于大规模生产的特点。该数码印刷机用张式纸张用清漆的应用方法,具有使用便捷,应用简单,并能够适合于大规模生产的特点。(The invention relates to the technical field of digital printing, in particular to varnish for sheet paper for a digital printing machine, and a preparation process and an application method thereof. The varnish for the sheet type paper for the digital printer comprises water-based acrylic acid, water, ethanol and ammonia water. Wherein the main component of the varnish is water, the appearance is milk white, and the pH value is 8.0-10.0. The varnish is coated on the surface of paper, so that the subsequent printing can be directly and digitally printed, the consumption is little, no drying element is contained, the production cost is low, and the varnish has the advantages of color retention, no yellowing, good printing performance, no roller sticking and good environmental protection. The preparation process of the varnish for the sheet paper for the digital printing machine has the characteristics of simple process, low production cost and suitability for large-scale production. The application method of the varnish for the sheet paper for the digital printing machine has the characteristics of convenience and quickness in use, simplicity in application and suitability for large-scale production.)

1. A varnish for sheet paper for a digital printer is characterized in that: comprises the following components in percentage by weight:

2. a varnish for sheet paper for a digital printer according to claim 1, wherein: comprises the following components in percentage by weight:

3. a varnish for sheet paper for a digital printer according to claim 1, wherein: comprises the following components in percentage by weight:

4. a process for preparing a varnish for sheet-type paper for digital printers as claimed in any one of claims 1 to 3, wherein: it comprises the following steps:

step one, preparing a first mixture: adding the water-based acrylic acid and the ethanol with the formula amount into the water with the formula amount, and stirring for a certain time to prepare a first mixture;

step two, preparing a finished product: and (3) adding ammonia water with the formula amount into the first mixture prepared in the step one, and stirring for a certain time to obtain the varnish for the sheet paper of the digital printing machine.

5. The process for preparing a varnish for sheet-type paper for digital printing machine according to claim 4, wherein: in the first step, the stirring time is 5min to 10 min.

6. The process for preparing a varnish for sheet-type paper for digital printing machine according to claim 4, wherein: in the second step, the stirring time is 3-8 min.

7. A method of applying varnish for sheet-type paper for digital printers as recited in any of claims 1 to 3, wherein: it comprises the following steps: coating glue on the laser film, then adhering the laser film on paper, baking the laser film by an oven, and then stripping the PET film; stirring the varnish for the sheet-type paper for the digital printing machine for 8-12 min, then coating by using a steel roller, then cutting the paper, and then performing digital printing of laser coating.

8. The process for preparing a varnish for sheet-type paper for digital printing machine according to claim 7, wherein: the wet coating amount of the varnish for the sheet type paper for the digital printing machine is 0.5g/m²～2g/m²。

9. The process for preparing a varnish for sheet-type paper for digital printing machine according to claim 7, wherein: the mesh number of the steel roller is 350-450 meshes.

Technical Field

The invention relates to the technical field of digital printing, in particular to varnish for sheet paper for a digital printing machine, and a preparation process and an application method thereof.

Background

Digital printing is a new industry, and a digital printing system is a technology of digitalization and networking in the whole printing process, covers the technologies of computer direct plate making, digital work flow, digital proofing, on-demand and quick printing and the like, and is necessary for adapting to the development of the information era in the printing industry. The digital printing has the characteristics of high requirement, small batch, quick change, capability of meeting the demand of publishing and the like. The main market orientation: book printing, newspaper and magazine printing, business transaction printing, anti-counterfeit printing, and the like.

Regarding laser anti-counterfeit printing, the current laser paper is mainly divided into two types: (1) laser composite paper; (2) laser transfer paper. However, the laser coating on the surface of the two kinds of paper is difficult to directly print in a digital mode, so that a supporting body is needed between the digital ink and the laser coating to play a role in starting and stopping, and the digital ink and the laser coating are combined to achieve the traditional laser printing effect.

With the promotion of market development and consumer concept, the laser effect of common digital printing is difficult to meet the requirements of high-end products, and the development of the multifunctional laser digital process is greatly superior to that of common digital printing in the aspects of stereoscopic impression and metal texture. Laser digital printing is also becoming widely used in label and packaging industries as a new anti-counterfeit technology.

Disclosure of Invention

The present invention provides a varnish for sheet-type paper for digital printing machine, which is used as a carrier between digital ink and laser coating, and has the advantages of color retention, no yellowing, good printing performance, no roller sticking, and low production cost.

The second purpose of the invention is to provide a preparation process of the varnish for the sheet-type paper for the digital printing machine, aiming at the defects of the prior art.

The invention also aims to provide an application method of the varnish for the sheet-type paper for the digital printing machine, aiming at the defects of the prior art.

In order to achieve one of the purposes, the invention adopts the following technical scheme:

the varnish for the sheet paper for the digital printing machine comprises the following components in percentage by weight:

preferably, the varnish for the sheet paper for the digital printing machine comprises the following components in percentage by weight:

more preferably, the varnish for the sheet paper for the digital printing machine comprises the following components in percentage by weight:

in order to achieve the second purpose, the invention adopts the following technical scheme:

the preparation process of varnish for sheet paper for digital printer includes the following steps:

step one, preparing a first mixture: adding the water-based acrylic acid and the ethanol with the formula amount into the water with the formula amount, and stirring for a certain time to prepare a first mixture;

step two, preparing a finished product: and (3) adding ammonia water with the formula amount into the first mixture prepared in the step one, and stirring for a certain time to obtain the varnish for the sheet paper of the digital printing machine.

In the above technical scheme, in the first step, the stirring time is 5min to 10 min.

In the above technical scheme, in the second step, the stirring time is 3min to 8 min.

In order to achieve the third purpose, the invention adopts the following technical scheme:

an application method of varnish for a sheet type paper for a digital printing machine is provided, which comprises the following steps: coating glue on the laser film, then adhering the laser film on paper, baking the laser film by an oven, and then stripping the PET film; stirring the varnish for the sheet-type paper for the digital printing machine for 8-12 min, then coating by using a steel roller, then cutting the paper, and then performing digital printing of laser coating.

In the technical scheme, the wet coating amount of the varnish for the sheet type paper for the digital printing machine is 0.5g/m²～2g/m²。

In the technical scheme, the mesh number of the steel roller is 350-450 meshes.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention provides varnish for sheet paper for a digital printer, which comprises water-based acrylic acid, water, ethanol and ammonia water. Wherein the main component of the varnish is water, the appearance is milk white, and the pH value is 8.0-10.0. The varnish is coated on the surface of paper, so that the subsequent printing can be directly and digitally printed, the consumption is little, no drying element is contained, the production cost is low, and the varnish has the advantages of color retention, no yellowing, good printing performance, no roller sticking and good environmental protection.

(2) The preparation process of the varnish for the sheet paper for the digital printing machine has the characteristics of simple process, low production cost and suitability for large-scale production.

(3) The application method of the varnish for the sheet paper for the digital printing machine has the characteristics of convenience and quickness in use, simplicity in application and suitability for large-scale production.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.