阅读说明：本技术 一种无溶剂镀铝复合转移联线印刷结构及印刷方法 (Solvent-free aluminizing composite transfer online printing structure and printing method ) 是由 易元锋 何承鹏 于 2020-06-12 设计创作，主要内容包括：本发明公开了一种无溶剂镀铝复合转移联线印刷结构及印刷方法,包括从下到上的背涂层、白卡底层、无溶剂复合胶水层、镀铝层、分离层和印刷图文层,该方法为：将PET镀铝转移膜,与卷筒白卡底纸,通过聚氨酯无溶剂复合转移胶水,进行复合转移,在线干燥剥离PET基膜后,在线联机送入凹印机组完成印刷加工。本发明由于使用聚氨酯无溶剂胶水作为粘合剂,通过胶黏剂加热后组分中的异氰酸根基团与羟基基团发生化学反应,形成分子质量较大的含有氨基甲酸根基团的材料,从而达到粘合的目的,因此其复合牢度特别可靠。(The invention discloses a solvent-free aluminizing composite transfer online printing structure and a printing method, wherein the solvent-free aluminizing composite transfer online printing structure comprises a back coating, a white card bottom layer, a solvent-free composite glue layer, an aluminizing layer, a separation layer and a printing image-text layer from bottom to top, and the method comprises the following steps: carrying out compound transfer on the PET aluminized transfer film and the winding drum white card base paper through polyurethane solvent-free compound transfer glue, drying and peeling the PET base film on line, and then sending the PET aluminized transfer film and the winding drum white card base paper to a gravure printing unit on line to finish printing processing. According to the invention, the polyurethane solvent-free glue is used as the adhesive, and after the adhesive is heated, the isocyanato group and the hydroxyl group in the components are subjected to chemical reaction to form a material containing a carbamate group with large molecular mass, so that the purpose of adhesion is achieved, and the compounding fastness of the polyurethane solvent-free glue is particularly reliable.)

1. A solvent-free aluminizing composite transfer online printing structure is characterized in that: comprises a back coating, a white card bottom layer, a solvent-free composite glue layer, an aluminum-plated layer, a separation layer and a printing picture and text layer from bottom to top.

2. The printing method of a solventless aluminizing composite transfer inline printing structure according to claim 1, wherein: the method comprises the following steps: the PET aluminizing transfer film and the winding drum white card base paper are subjected to composite transfer through polyurethane solvent-free composite transfer glue, and after the PET base film is dried and stripped on line, the PET aluminizing transfer film and the winding drum white card base paper are sent to a gravure printing unit on line to complete printing and processing, so that the novel PET aluminizing transfer paper packaging material with a multilayer structure and without solvent residue is finally obtained.

3. The printing method of the solventless aluminizing composite transfer inline printing structure according to claim 2, wherein: the method specifically comprises the following steps:

(1) preheating the solvent-free transfer glue, and coating the PET aluminized film surface by a four-roller coating machine structure;

(2) compounding the PET aluminized film coated with the solvent-free glue in the step (1) with base paper;

(3) drying the product prepared in the step (2), and peeling off the PET base film;

(4) back coating the product prepared in the step (3) for processing treatment;

(5) and (4) carrying out gravure on-line printing processing on the product prepared in the step (4) to obtain a final printed product.

4. The printing method of the solventless aluminizing composite transfer inline printing structure according to claim 3, wherein: the solvent-free transfer glue adopts a high-performance self-addition polymerization single-component polyurethane adhesive, the solid content is 100, the viscosity is 800 +/-100 mPa.s at normal temperature, and the specific gravity is 1.05-1.10.

5. The printing method of the solventless aluminizing composite transfer inline printing structure according to claim 3, wherein: when the four-roller or five-roller coating machine structure is used for coating, the intermittence is 0.02-0.05mm, the speed is 150-180m/min, and the pressure is 2-5kg during coating.

6. The printing method of the solventless aluminizing composite transfer inline printing structure according to claim 3, wherein: the tension of the PET aluminizer control equipment during the compounding in the step (2) is controlled to be 5-8kg, and the variation range is less than or equal to 0.5 kg.

7. The printing method of the solventless aluminizing composite transfer inline printing structure according to claim 3, wherein: the components of the roll white cardboard comprise the following components in percentage by mass: 60% of raw wood pulp, 35% of chemical pulp and 5% of additive.

8. The printing method of the solventless aluminizing composite transfer inline printing structure according to claim 3, wherein: the gravure roller used in printing is mainly laser engraved with a shaft, the printing speed is 150-180m/min, and the viscosity change of printing ink is less than or equal to 3 s.

Technical Field

The invention belongs to the technical field of packaging color box printing, and relates to a solvent-free aluminizing composite transfer on-line printing structure and a printing method of the solvent-free aluminizing composite transfer on-line printing structure.

Background

The foreign German Hangao company firstly proposes and realizes the preparation of the solvent-free polyurethane adhesive into the composite film packaging material in the last 70 th century, and gradually popularizes the composite film packaging material to more than 50 percent of the market share, and also gradually introduces solvent-free compound machine equipment in China, and has the advantages that: the whole production process is pollution-free; no solvent residue exists in the final product; the production process is safe and has no hidden trouble. Therefore, the research on solvent-free compounding and transfer is more and more in recent years in China, and particularly in the field of plastic flexible packaging, a solvent-free compounding printing process is realized in a large quantity. However, for cigarette pack printing, the PET aluminized transfer paper is one of the most important raw materials, and the national requirement for detecting the solvent residue is very high. At present, the conventional production process on the market mainly separates the solvent-free composite transfer paper making of the PET aluminizer from the printing processing procedure, and has low efficiency because of the following reasons: conventionally, the preparation of 30 ten thousand pieces of PET aluminum-plated transfer paper requires 24 hours for composite transfer, 24 to 48 hours for aging, and 24 to 96 hours for printing of the 30 ten thousand pieces of paper.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the method realizes synchronous completion of composite transfer processing and printing finishing processing of a PET aluminized film and roll bottom paper, saves processing procedures, obtains a PET aluminized transfer paper printing structure product without volatile organic compound solvent residues, and has safe and pollution-free processing procedures and products so as to solve the problems in the prior art.

The technical scheme adopted by the invention is as follows: a solvent-free aluminizing composite transfer online printing structure comprises a back coating, a white card bottom layer, a solvent-free composite glue layer, an aluminizing layer, a separating layer and a printing image-text layer from bottom to top.

A printing method of a solvent-free aluminizing composite transfer online printing structure comprises the following steps: the PET aluminizing transfer film and the winding drum white card base paper are subjected to composite transfer through polyurethane solvent-free composite transfer glue, and after the PET base film is dried and stripped on line, the PET aluminizing transfer film and the winding drum white card base paper are sent to a gravure printing unit on line to complete printing and processing, so that the novel PET aluminizing transfer paper packaging material with a multilayer structure and without solvent residue is finally obtained.

Preferably, the printing method of the solvent-free aluminizing composite transfer online printing structure specifically includes the following steps:

(1) preheating the solvent-free transfer glue, and coating the PET aluminized film surface by a four-roller coating machine structure;

(2) compounding the PET aluminized film coated with the solvent-free glue in the step (1) with base paper;

(3) drying the product prepared in the step (2), and peeling off the PET base film;

(4) back coating the product prepared in the step (3) for processing treatment;

(5) and (4) carrying out gravure on-line printing processing on the product prepared in the step (4) to obtain a final printed product.

Preferably, the solvent-free transfer glue adopts a high-performance self-addition polymerization single-component polyurethane adhesive, the solid content is 100, the viscosity at normal temperature (25 +/-3 ℃) is 800 +/-100 mPa.s, and the specific gravity is 1.05-1.10.

Preferably, the four-roll coater is configured to perform the coating with a pause of 0.02-0.05mm, a speed of 150-180m/min, and a pressure of 2-5 kg.

Preferably, the tension of the PET aluminizing film control equipment during the compounding in the step 2 is controlled to be 5-8kg, and the variation range is less than or equal to 0.5 kg.

Preferably, the components of the roll white cardboard comprise the following components in percentage by mass: 60% of raw wood pulp, 35% of chemical pulp and 5% of additive.

Preferably, the gravure roller used in the printing is mainly laser engraved with a shaft, the printing speed is 150-180m/min, and the viscosity change of the printing ink is less than or equal to 3 s.

The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:

(1) because the polyurethane solvent-free glue is used as the adhesive, the isocyanate group and the hydroxyl group in the components are subjected to chemical reaction after the adhesive is heated to form the material with larger molecular weight and containing the carbamate group, the purpose of adhesion is achieved, and the compounding fastness is particularly reliable;

(2) the solvent-free PET aluminizing composite transfer process has the advantages that the cost of the solvent is reduced, the environment is not polluted by volatilization of the organic solvent, a solvent volatilization drying section is not needed, the energy consumption is reduced, the risks of fire and explosion are avoided, the explosion-proof measure of the solvent is not needed, and equipment and a storehouse for storing the solvent are not needed;

(3) the obtained transfer paper product has no volatile organic compound residue, and eliminates the invasion and pollution of solvent to printing ink;

(4) because the moisture balance variation of the paper body paper in the processing process is extremely small, the paper after composite transfer does not need to be treated in a curing period, energy is saved, and the color bursting problem is not easy to occur at the position of a crease line when a product is processed and formed in a post process;

(5) the PET aluminizer and the bobbin base paper are subjected to compound transfer online printing synchronously, the production efficiency is high, the efficiency can be improved by more than 50% only by 24-28 hours from the completion of the paper preparation to the completion of the printing, the quality is stable and reliable, in addition, the existing printing structure has completely consistent functions with the conventional process preparation, and the printing structure absolutely does not contain VOC solvent residue, so the printing structure is very environment-friendly;

in summary, the following steps: because the polyurethane solvent-free glue is used as the adhesive, the composite fastness is reliable, volatile organic compounds cannot be generated in the production process, and residual pollution to the packaging product cannot be generated; in the processing process, because the moisture balance variation of the paper body paper is extremely small, the paper after composite transfer does not need to be treated in a curing period, so that the energy is saved, and the color bursting problem is not easy to occur at the position of a crease line when a product is processed and formed in a post process; the compound transfer on-line printing of the PET aluminizer and the bobbin base paper is synchronously finished, the production efficiency is high, and the quality is stable and reliable.

Drawings

Fig. 1 is a schematic structural diagram of a solventless aluminizing composite transfer on-line printing structure.

Fig. 2 is a flow chart of a printing process of a solventless aluminizing composite transfer on-line printing structure.

Detailed Description

The invention is further described below with reference to specific examples.