阅读说明：本技术 一种基于塑料薄膜的凹版高效印刷工艺 (Plastic film-based gravure efficient printing process ) 是由 姜海涛 于 2021-01-08 设计创作，主要内容包括：本发明公开了一种基于塑料薄膜的凹版高效印刷工艺,包括以下步骤：S1、印前准备：将待印刷的塑料薄膜安装到凹版印刷机内,检测机器的各部分有无卡阻现象,并向润滑部分注入润滑油；S2、待印刷的塑料薄膜依次经过多个印刷机组,进行不同色彩的打印；S3、装版：按照印刷色序将印版滚筒分别安装在各个色组；S4、调整规矩上刮墨刀：印刷前的准备工作完成之后,再仔细校准印版,检查给纸、输纸、收纸、推拉规矩的情况。本发明提出的一种基于塑料薄膜的凹版高效印刷工艺印刷出来的塑料薄膜油墨不脱离、墨色均匀、印迹不发糊起毛、无斑点、无刮痕、无颜料沉淀和不粘脏,印刷效果好,而且印刷效率高。(The invention discloses a plastic film-based gravure efficient printing process, which comprises the following steps of: s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part; s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors; s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence; s4, adjusting the doctor blade on the gauge: after the preparation before printing is completed, the printing plate is carefully calibrated, and the conditions of paper feeding, paper conveying, paper receiving and gauge pushing and pulling are checked. The plastic film ink printed by the plastic film-based gravure efficient printing process provided by the invention is free from separation, uniform in ink color, free from printing marks of pasting and fluffing, free from spots, scratches, pigment precipitation and dirt, good in printing effect and high in printing efficiency.)

1. The plastic film-based gravure efficient printing process is characterized by comprising the following steps of:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

2. The plastic film-based gravure high-efficiency printing process as claimed in claim 1, wherein an ink is required in the printing process, and the ink comprises the following raw materials in parts by weight: 32-40 parts of ester-soluble polyurethane resin liquid, 12-20 parts of aluminum powder, 12-20 parts of nitrocellulose, 10-18 parts of citric acid, 30-38 parts of pigment, 1-5 parts of dispersing agent, 1-5 parts of defoaming agent, 1-5 parts of cosolvent and 1-5 parts of water.

3. The plastic film-based gravure high-efficiency printing process as claimed in claim 2, wherein the ink comprises the following raw materials in parts by weight: 32 parts of ester-soluble polyurethane resin liquid, 12 parts of aluminum powder, 12 parts of nitrocellulose, 10 parts of citric acid, 30 parts of pigment, 1 part of dispersant, 1 part of defoamer, 1 part of cosolvent and 1 part of water.

4. The plastic film-based gravure high-efficiency printing process as claimed in claim 2, wherein the ink comprises the following raw materials in parts by weight: 36 parts of ester-soluble polyurethane resin liquid, 16 parts of aluminum powder, 16 parts of nitrocellulose, 14 parts of citric acid, 34 parts of pigment, 3 parts of dispersant, 3 parts of defoamer, 3 parts of cosolvent and 3 parts of water.

5. The plastic film-based gravure high-efficiency printing process as claimed in claim 2, wherein the ink comprises the following raw materials in parts by weight: 40 parts of ester-soluble polyurethane resin liquid, 20 parts of aluminum powder, 20 parts of nitrocellulose, 18 parts of citric acid, 38 parts of pigment, 5 parts of dispersant, 5 parts of defoaming agent, 5 parts of cosolvent and 5 parts of water.

6. The plastic film-based gravure high-efficiency printing process as claimed in claim 1, wherein the printing process requires 30 minutes for sampling detection, and the detection is performed to detect whether the dot is complete, the overprint is accurate, the ink color is bright, and whether the viscosity and drying of the ink are matched with the printing speed.

7. The plastic film-based intaglio high-efficiency printing process according to claim 1, wherein the doctor blade on the adjusting gauge is used for adjusting the distance from the doctor blade to the printing plate and the angle of the doctor blade, so that the pressure of the doctor blade on the printing plate is uniform without damaging the printing plate.

Technical Field

The invention relates to the technical field of plastic films, in particular to a plastic film-based efficient gravure printing process.

Background

The plastic packaging bag is a packaging bag which takes plastic as a raw material and is used for producing various articles in daily life, and is widely used in daily life and industrial production. In the production process of plastic packaging bags, the plastic packaging bags are usually printed to different degrees for the purposes of improving the recognition degree, beautifying the appearance and the like.

The intaglio printing is that all the parts of the printing surface are inked, then the ink is scraped off along the blank part surface by a scraper, and then the ink in the lower concave cells is directly transferred to the surface of a bearing object by the action of pressure. At present, the process for gravure printing of PVC films at home and abroad mainly uses solvent ink and is characterized by high printing speed, bright color and simple equipment; the method has the defects of environmental pollution, large amount of Volatile Organic Compounds (VOC) emission, air pollution and great harm of organic solvents to human bodies. With the improvement of the environmental protection consciousness of people, the printing of soluble ink is strictly forbidden in many national regions, the printing of the soluble ink is strictly limited in China, and the printing of the solvent ink is strictly forbidden in the Beijing region from 1 month to 1 day in 2018.

Therefore, the selection of the printing technology which is environment-friendly, pollution-free, zero-emission and harmless to human bodies is urgent, the environment-friendly water-based ink printing existing in the current domestic and foreign markets is mostly applied to the printing of paper, the printing of plastic films, especially plastic films which shrink and deform after being heated, for example, materials such as PVC, PE, PP and the like are not realized, and the existing technical problems mainly lie in that: (1) the water-based ink is not easy to dry; (2) if the printing is not finished, the phenomenon of wrong printing exists, and the effect of exquisite printing patterns cannot be obtained.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a plastic film-based gravure efficient printing process.

A plastic film-based gravure high-efficiency printing process comprises the following steps:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

Further, the printing process needs to use ink, and the ink comprises the following raw materials in parts by weight: 32-40 parts of ester-soluble polyurethane resin liquid, 12-20 parts of aluminum powder, 12-20 parts of nitrocellulose, 10-18 parts of citric acid, 30-38 parts of pigment, 1-5 parts of dispersing agent, 1-5 parts of defoaming agent, 1-5 parts of cosolvent and 1-5 parts of water.

Further, the ink comprises the following raw materials in parts by weight: 32 parts of ester-soluble polyurethane resin liquid, 12 parts of aluminum powder, 12 parts of nitrocellulose, 10 parts of citric acid, 30 parts of pigment, 1 part of dispersant, 1 part of defoamer, 1 part of cosolvent and 1 part of water.

Further, the ink comprises the following raw materials in parts by weight: 36 parts of ester-soluble polyurethane resin liquid, 16 parts of aluminum powder, 16 parts of nitrocellulose, 14 parts of citric acid, 34 parts of pigment, 3 parts of dispersant, 3 parts of defoamer, 3 parts of cosolvent and 3 parts of water.

Further, the ink comprises the following raw materials in parts by weight: 40 parts of ester-soluble polyurethane resin liquid, 20 parts of aluminum powder, 20 parts of nitrocellulose, 18 parts of citric acid, 38 parts of pigment, 5 parts of dispersant, 5 parts of defoaming agent, 5 parts of cosolvent and 5 parts of water.

Furthermore, sampling detection is carried out for 30 minutes in the printing process, and whether the dots are complete, overprinting is accurate, the ink color is bright, and whether the viscosity and drying of the ink are matched with the printing speed is detected.

Furthermore, the doctor blade on the adjusting gauge is used for adjusting the distance from the doctor blade to the printing plate and the angle of the doctor blade, so that the pressure of the doctor blade on the printing plate is uniform and the printing plate is not damaged.

The plastic film ink printed by the plastic film-based gravure efficient printing process provided by the invention is free from separation, uniform in ink color, free from printing marks of pasting and fluffing, free from spots, scratches, pigment precipitation and dirt, good in printing effect and high in printing efficiency.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.

Example one

The invention provides a plastic film-based gravure efficient printing process, which comprises the following steps of:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

The ink comprises the following raw materials in parts by weight: 32 parts of ester-soluble polyurethane resin liquid, 12 parts of aluminum powder, 12 parts of nitrocellulose, 10 parts of citric acid, 30 parts of pigment, 1 part of dispersant, 1 part of defoamer, 1 part of cosolvent and 1 part of water.

Example two

The invention provides a plastic film-based gravure efficient printing process, which comprises the following steps of:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

The ink comprises the following raw materials in parts by weight: 34 parts of ester-soluble polyurethane resin liquid, 14 parts of aluminum powder, 14 parts of nitrocellulose, 12 parts of citric acid, 32 parts of pigment, 2 parts of dispersant, 2 parts of defoaming agent, 2 parts of cosolvent and 2 parts of water.

EXAMPLE III

The invention provides a plastic film-based gravure efficient printing process, which comprises the following steps of:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

The ink comprises the following raw materials in parts by weight: 36 parts of ester-soluble polyurethane resin liquid, 16 parts of aluminum powder, 16 parts of nitrocellulose, 14 parts of citric acid, 34 parts of pigment, 3 parts of dispersant, 3 parts of defoamer, 3 parts of cosolvent and 3 parts of water.

Example four

The invention provides a plastic film-based gravure efficient printing process, which comprises the following steps of:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

The ink comprises the following raw materials in parts by weight: 38 parts of ester-soluble polyurethane resin liquid, 18 parts of aluminum powder, 18 parts of nitrocellulose, 16 parts of citric acid, 36 parts of pigment, 4 parts of dispersant, 4 parts of defoaming agent, 4 parts of cosolvent and 4 parts of water.

EXAMPLE five

The invention provides a plastic film-based gravure efficient printing process, which comprises the following steps of:

s1, preparation before printing: installing a plastic film to be printed in a gravure printing machine, detecting whether each part of the machine has a jamming phenomenon or not, and injecting lubricating oil into the lubricating part;

s2, sequentially passing the plastic film to be printed through a plurality of printing units to print different colors;

s3, mounting: respectively installing the plate cylinders in each color group according to the printing color sequence;

s4, adjusting the doctor blade on the gauge: after the preparation work before printing is finished, carefully calibrating the printing plate, checking the conditions of paper feeding, paper conveying, paper collecting and push-pull rules, properly adjusting, correcting pressure, overlapping the ink scraping knife and the hard knife gasket, placing the overlapped ink scraping knife and the hard knife gasket between an upper clamping plate and a lower clamping plate, screwing the overlapped ink scraping knife and the hard knife gasket by using a bolt, and tensioning the bolt from the middle to the left end and the right end during operation so as to eliminate the bending phenomenon of the blade;

s5, main printing: printing is performed on the surface of the plastic film.

The ink comprises the following raw materials in parts by weight: 40 parts of ester-soluble polyurethane resin liquid, 20 parts of aluminum powder, 20 parts of nitrocellulose, 18 parts of citric acid, 38 parts of pigment, 5 parts of dispersant, 5 parts of defoaming agent, 5 parts of cosolvent and 5 parts of water.

Plastic films were printed from the above examples, and the printed plastic films were tested and tabulated as follows: (comparative example is a plastic film printed by the prior art)

From the table data, the plastic film ink printed by the plastic film-based gravure efficient printing process provided by the invention has the advantages of no separation, uniform ink color, no printing mark, no blushing, no spots, no scratch, no pigment precipitation and no dirt sticking, good printing effect and high printing efficiency.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.