CN113370693A

CN113370693A - High-efficiency curing transfer printing digital roller printing process and equipment

Info

Publication number: CN113370693A
Application number: CN202110788577.3A
Authority: CN
Inventors: 章晓洁
Original assignee: Zhejiang Yingsaide Digital Technology Co ltd
Current assignee: Zhejiang Yingsaide Digital Technology Co ltd
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2021-09-10
Anticipated expiration: 2041-07-13
Also published as: CN113370693B

Abstract

The application belongs to the technical field of digital printing, and relates to a high-efficiency curing transfer printing digital roller printing process, wherein antistatic ionized ink is sprayed on a printing roller according to a set position and is subjected to pre-polishing and curing treatment; preheating the substrate; and (3) conveying the substrate subjected to pre-heating treatment between a printing roller and a pressing roller, and transferring the antistatic release ink subjected to pre-photocuring treatment onto the substrate through imprinting. Still provide a digital roller lithography apparatus of high-efficient solidification rendition to above-mentioned technology, including printing roller and pinch roller, have the impression clearance between printing roller and the pinch roller, the top of printing roller is equipped with the printing ink shower nozzle, and the printing roller turns to and is equipped with ultraviolet irradiation device on the path of pinch roller one side, be equipped with heating device in the pinch roller. The printing ink is pre-cured in the rapid transfer process, so that the printing is accurately cleaned, and halation is reduced.

Description

High-efficiency curing transfer printing digital roller printing process and equipment

Technical Field

The invention belongs to the technical field of digital printing, relates to a roller printing technology, and particularly relates to a high-efficiency curing transfer printing digital roller printing process and equipment.

Background

Digital printing is the digitization of printing technology. Generally refers to the digitization of part or all of the overall process. The traditional digital printing method is generally divided into two types, wherein one type is that two rollers are adopted to clamp the material in the middle, and the roller positioned below is immersed in the ink to bring the ink upwards to the material; the other method is to directly spray and print on the material by adopting a spray head, and both the two methods have limitations, so that the printing speed is slow, and the ink is easy to disperse, so that the effect is poor. At present, some manufacturers adopt a scheme of combining a roller printing mode and an ink jet printing mode.

For example, chinese patent application No. cn201710878989.x discloses an ink jet mechanism of a printer, and belongs to the technical field of machinery. It has solved the poor technical problem of waiting of current printing machine printing quality. The printing machine includes the casing, rotate the roller and the rolling roller of unreeling of connection in the casing, it is connected with the printing roller to lie in to unreel to rotate between roller and the rolling roller in the casing, this ink jet mechanism sets up on the casing and lies in directly over the printing roller, ink jet mechanism is including the ink horn that is rectangular shape and fixing a plurality of nozzles in the ink horn lower part, the ink horn is parallel with the printing roller, the length direction along the ink horn in the ink horn separates there are a plurality of ink pond chambeies, a plurality of nozzles are arranged and every nozzle corresponds an ink pond chamber of intercommunication along the length direction of ink horn, the lower extreme of ink horn is fixed with the cover body, the.

Although the printing effect can be improved to a certain extent by the technical scheme, the printing ink is easy to adhere to the printing roller and needs to be cleaned by cleaning, drying or a scraper, and the printing efficiency is seriously influenced.

Disclosure of Invention

The application aims to solve the problems and provides an efficient curing transfer printing digital roller printing process;

the application aims at the problem and also provides a high-efficiency curing transfer printing digital roller printing device.

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

the application creatively provides a high-efficiency curing transfer printing digital roller printing process, which is characterized by comprising the following steps:

spraying antistatic ink on a printing roller according to a set position and carrying out pre-polishing and curing treatment;

preheating the substrate;

and (3) conveying the substrate subjected to pre-heating treatment between a printing roller and a pressing roller, and transferring the antistatic release ink subjected to pre-photocuring treatment onto the substrate through imprinting.

In the high-efficiency curing transfer printing digital roller printing process, the base material is tightly attached to the compression roller to run for a certain distance before imprinting, and the compression roller is heated to carry out the preheating treatment on the base material.

In the efficient curing and transfer printing digital roller printing process, the substrate runs along the 45-60-degree deviation direction of the pressing roller after being imprinted, so that the substrate is ensured to meet the tension required by imprinting, and the firmness of the ink and the substrate is improved.

In the high-efficiency curing transfer printing digital roller printing process, the antistatic ionized ink is prepared by mixing and grinding pigment, polyurethane, rosin modified phenolic resin, trimethylolpropane tripalmitate, paraffin micro powder, polytetrafluoroethylene micro powder, animal cartilage powder, a photoinitiator, an antistatic agent, a defoaming agent and a solvent to a nanometer level.

In the high-efficiency curing transfer printing digital roller printing process, the antistatic ion type ink is prepared by mixing and grinding 5-14 parts of pigment, 18-36 parts of polyurethane, 2-11 parts of rosin modified phenolic resin, 1-5 parts of trimethylolpropane tripalmitate, 1-3 parts of paraffin micro powder, 1-3 parts of polytetrafluoroethylene micro powder, 0.5-1.5 parts of animal cartilage powder, 0.5-2 parts of photoinitiator, 0.2-2 parts of antistatic agent, 0.2-0.5 part of defoaming agent and 20-50 parts of solvent to 10-100nm in parts by weight.

Preferably, the animal cartilage powder is salmon cartilage powder which is sterilized and has the fineness of 200 meshes.

Preferably, the addition amount of the polytetrafluoroethylene micro powder and the animal cartilage powder is 2: 1.

The inventor researches and discovers that the adhesiveness of the ink can be optimized when the animal cartilage powder and the polytetrafluoroethylene micro powder are mixed, particularly when the adding amount of the polytetrafluoroethylene micro powder and the animal cartilage powder is 2: 1.

Specifically, the photoinitiator is a combination of one or more of a photoinitiator 907, a photoinitiator DETX, a photoinitiator 819, a photoinitiator BP, and a photoinitiator ITX.

Specifically, the solvent is one or more of butanone, ethyl acetate, butyl acetate, methyl isobutyl ketone, propylene glycol monomethyl ether and isopropyl ketone.

Specifically, the pigment is any one of titanium dioxide, pigment red, pigment yellow, pigment blue, carbon black or other pigments.

Specifically, the antistatic agent and the defoaming agent are products for commercial inks, and no special requirement is made here.

In addition, the trimethylolpropane tripalmondyl ester is added, so that the ink has a good release effect with the roll surface, and can be quickly separated from the roll surface after being cured. The rosin modified phenolic resin can improve the luster, dryness, water resistance, viscosity, rheological property and printing performance of the printing ink,

in the high-efficiency curing transfer printing digital roller printing process, the thickness of the antistatic ion type ink is 1-10 mu m, the ultraviolet irradiation with the intensity of 80-90W/cm is adopted for the pre-photo-curing treatment for 0.1-0.3s, and the time from the end of the pre-photo-curing treatment to the beginning of the imprinting is less than 1 s.

The ink is precured to form a film structure by high intensity rapid ultraviolet irradiation.

In the high-efficiency curing transfer printing digital roller printing process, the preheating temperature of the preheating treatment is 90-120 ℃.

The utility model provides a digital roller lithography apparatus of high-efficient solidification rendition to above-mentioned technology, includes printing roller and pinch roller, has the impression clearance between printing roller and the pinch roller, and the top of printing roller is equipped with the printing ink shower nozzle, and the printing roller turns to and is equipped with ultraviolet irradiation device on the path of pinch roller one side, be equipped with heating device in the pinch roller.

In the high-efficiency curing and transferring digital roller printing equipment, the roller surfaces of the printing roller and the pressing roller are high-temperature-resistant rubber layers.

In the efficient curing and transferring digital roller printing equipment, a first guide roller set is arranged on the upstream side of the pressure roller, the base material is fed into the imprinting gap through the guide roller set and then closely attached to the upstream side of the pressure roller, a second guide roller set is arranged on the downstream side of the pressure roller, and the base material is fed out from the imprinting gap and then moves in the direction of deflecting by 45-60 degrees towards the pressure roller 2 side through the second guide roller set 7.

Compared with the prior art, the invention has the advantages that: the method combines spray printing and impression printing, and the ink is cured firstly and then is impressed with the preheated substrate to achieve the purpose of rapid transfer printing, so that the ink is cured in advance in the rapid transfer printing process to ensure the accurate cleaning of the printing, and reduce halation.

The invention adopts the nanoscale antistatic release ink, can reduce the adhesion with the printing roller by matching with a precuring mode, is completely separated from the printing roller, does not need to add a scraper or an additional cleaning and drying step, improves the production efficiency and reduces the consumption of the printing roller. The printing speed can reach 450 m/min. And the antistatic ink can be tightly combined with a preheated base material under pressurization after being cured, so that the product has qualified color fastness.

Drawings

FIG. 1 is a schematic structural diagram of an efficient curing transfer printing digital roller printing device provided by the present application.

In the figure, a printing roller 1, a pressure roller 2, an ink jet head 3, an ultraviolet irradiation device 4, a heating device 5, a first guide roller group 6, and a second guide roller group 7.

Detailed Description

Further illustrated by the following specific examples;

example 1

Referring to fig. 1, an efficient curing transfer printing digital roller printing process includes the following steps:

a. and spraying antistatic ink on the printing roller 1 according to a set position and performing pre-polishing treatment. The pre-light curing treatment adopts ultraviolet light with the intensity of 90W/cm and the wavelength of 313nm to irradiate for 0.1-0.3 s.

b. The base material is clung to the pressing roller 2 for a certain distance before imprinting, and the base material is preheated by heating the pressing roller 2. The preheating temperature of the preheating treatment is 90-120 ℃, so that the binding surface of the antistatic ionized ink and the base material has certain viscosity, and the antistatic ionized ink is transferred to the preheated base material under the action of pressure.

c. And (c) conveying the substrate subjected to the pre-heating treatment in the step b between a printing roller 1 and a pressing roller 2, and transferring the antistatic release ink subjected to the pre-photocuring treatment in the step a onto the substrate through imprinting. The time elapsed from the end of the pre-photocuring process to the start of imprinting is less than 1 s.

The substrate moves along the direction which is deviated from the compression roller 2 and forms an included angle with the horizontal tangent line between the printing roller 1 and the compression roller 2 by 45-60 degrees after being pressed.

In order to achieve the above effects, the antistatic release ink is used in this embodiment in combination, and the antistatic release ink is prepared by mixing and grinding 5 parts by weight of titanium dioxide, 25 parts by weight of polyurethane, 11 parts by weight of rosin modified phenolic resin, 1 part by weight of trimethylolpropane tripalmitate, 3 parts by weight of paraffin fine powder, 3 parts by weight of polytetrafluoroethylene fine powder, 1.5 parts by weight of salmon soft bone powder, 0.5 part by weight of photoinitiator, 0.2 part by weight of antistatic agent, 0.5 part by weight of defoaming agent and 49.3 parts by weight of solvent to 50 nm.

Wherein the photoinitiator is prepared by compounding a photoinitiator 907, a photoinitiator DETX and a photoinitiator BP 3:1:1 in weight ratio.

The pressure between the pressure roller 2 and the printing roller 1 is 300-400N, and the rotating speed of the pressure roller 2 and the printing roller 1 can reach 500 m/min.

In this embodiment, the base material is thermal transfer paper.

Example 2

This example is substantially the same as example 1 except that an antistatic ink is prepared by mixing 10 parts by weight of pigment red, 30 parts by weight of polyurethane, 8 parts by weight of rosin-modified phenol resin, 3 parts by weight of trimethylolpropane tripalmonds, 2 parts by weight of fine paraffin wax powder, 2 parts by weight of fine polytetrafluoroethylene powder, 1 part by weight of salmon soft bone powder, 1 part by weight of photoinitiator, 2 parts by weight of antistatic agent, 0.3 part by weight of defoaming agent and 40.7 parts by weight of solvent and grinding the mixture to 30 nm.

Wherein the photoinitiator is prepared by compounding a photoinitiator 907, a photoinitiator DETX and a photoinitiator ITX 3:2:2 in weight ratio.

Example 3

This example is substantially the same as example 1 except that an antistatic ink is prepared by mixing and grinding 9 parts by weight of pigment yellow, 32 parts by weight of polyurethane, 4 parts by weight of rosin-modified phenol resin, 5 parts by weight of trimethylolpropane tripalmonds, 2 parts by weight of fine paraffin wax powder, 2 parts by weight of fine polytetrafluoroethylene powder, 1 part by weight of salmon soft bone powder, 2 parts by weight of photoinitiator, 1 part by weight of antistatic agent, 0.4 part by weight of defoaming agent and 41.6 parts by weight of solvent to 40 nm.

Wherein the photoinitiator is prepared by compounding a photoinitiator 819, a photoinitiator DETX and a photoinitiator ITX 3:2:1 in weight ratio.

Example 4

As shown in fig. 1, the high-efficiency curing and transferring digital roller printing equipment comprises a printing roller 1 and a pressing roller 2, wherein an imprinting gap is formed between the printing roller 1 and the pressing roller 2, an ink nozzle 3 is arranged above the printing roller 1, an ultraviolet irradiation device 4 is arranged on a path of the printing roller 1, which is turned to one side of the pressing roller 2, and a heating device 5 is arranged in the pressing roller 2.

The upstream side of the pinch roller 2 is provided with a first guide roller group 6, the base material passes through the guide roller group 5 and then closely contacts the upstream side of the pinch roller 2 to move for 90-120 degrees and then is fed into the nip, the downstream side of the pinch roller 2 is provided with a second guide roller group 7, and the base material is fed out from the nip and then moves in a direction of deflecting for 45-60 degrees towards the pinch roller 2 side through the second guide roller group 7.

The roll surfaces of the printing roll 1 and the compression roll 2 are high-temperature resistant rubber layers.

The first guide roller group 6 includes at least two guide rollers, and the second guide roller group 7 includes at least one guide roller.

The heating device 5 arranged in the pressing roller 2 can directly adopt a roller with a heating function sold in the market, and the heating device 5 can be an infrared heating device or an electric heating device.

Comparative example 1

This comparative example is substantially the same as example 1 except that the antistatic release ink is subjected to photocuring after being transferred onto a substrate subjected to preheating treatment. The photocuring conditions were the same as in example 1.

Comparative example 2

This comparative example is substantially the same as example 1 except that the antistatic release ink was ground to 10 μm.

Comparative example 3

This comparative example is essentially the same as example 1, except that: the antistatic ink is prepared by mixing and grinding 5 parts of titanium dioxide, 25 parts of polyurethane, 11 parts of rosin modified phenolic resin, 3 parts of paraffin micro powder, 3 parts of polytetrafluoroethylene micro powder, 1.5 parts of salmon soft bone powder, 0.5 part of photoinitiator, 0.2 part of antistatic agent, 0.5 part of defoaming agent and 50.3 parts of solvent to 50 nm.

Comparative example 4

This comparative example is essentially the same as example 1, except that: the antistatic ionized ink is prepared by mixing and grinding 5 parts of titanium dioxide, 25 parts of polyurethane, 11 parts of rosin modified phenolic resin, 1 part of trimethylolpropane tripalmitate, 3 parts of paraffin micro powder, 4.5 parts of polytetrafluoroethylene micro powder, 0.5 part of photoinitiator, 0.2 part of antistatic agent, 0.5 part of defoaming agent and 49.3 parts of solvent to 50 nm.

Comparative example 5

This comparative example is essentially the same as example 1, except that: the intensity of the pre-light curing treatment is 30W/cm.

Application example

The same thermal transfer paper was used to print the same pattern at the same rotation speed as in example 1, comparative example 1 and comparative example 2, and prints 1 to 3 were obtained in this order, and the edge smoothness of the prescribed pattern in the prints 1 to 3 was observed to perform the sharpness analysis, and the results are shown in the following table:

TABLE 1 evaluation chart of pattern definition of printed matters 1-3

Printed matter	Printed matter 1	Printed matter 2	Printed matter 3
				Grade of sharpness	a	c	b

The sharpness level gradually decreases from a to c.

The results show that the pattern edges of print 1 are smooth and that the pattern edges of both print 2 and print 3 appear to be matted to different degrees. The method adopts the mode of firstly curing and then stamping to ensure that the patterns of the printed matter are kept complete and clear, and the fineness of the printing ink is improved, and the definition of the printed matter can also be improved.

In order to test the separating ability of the antistatic release ink and the printing roller 1 in different processes, 3ml of antistatic release ink is respectively injected into the processes of example 1 and comparative examples 1 to 5 for printing, a rubber scraper is used for scraping the residual antistatic release ink on the surface of the printing roller 1 after the printing is finished, the weight is weighed, and the results are shown in the following table:

TABLE 2 List of the quality of the remaining antistatic release inks

The results show that better curing of the antistatic inks can be achieved by higher intensity uv irradiation, leaving the printing roller 1 intact. And, the separation ability can be further improved by adding trimethylolpropane tripalmondyl ester to the antistatic release ink.

In order to test the color fastness of the antistatic release ink and the substrate in different processes, the processes of example 1 and comparative examples 2 to 5 are respectively adopted to respectively manufacture printed matters 4 to 8, the patterns of the samples are respectively rubbed with wiping sandpaper repeatedly 3000 times, and the staining grade number of the wiping sandpaper corresponding to each printed matter is recorded, and the results are as follows.

TABLE 3 List of staining levels of wiping sandpaper corresponding to prints 4-8

The color fastness rating gradually decreased from a to E.

The result shows that the viscosity of the ink can be increased by adding salmon soft bone powder into the antistatic release ink, so that the color fastness of the ink is improved. Meanwhile, in order to achieve better color fastness, higher-intensity ultraviolet light is required for curing.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the printing roller 1, the pressure roller 2, the ink jet head 3, the ultraviolet irradiation device 4, the heating device 5, the first guide roller group 6, the second guide roller group 7, the pigment, the polyurethane, the rosin-modified phenol resin, the trimethylolpropane tripalmitate, the fine paraffin wax powder, the fine polytetrafluoroethylene powder, the animal cartilage powder, the photoinitiator, the antistatic agent, the defoaming agent, and the like are used more frequently herein. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.

Claims

1. An efficient curing transfer printing digital roller printing process is characterized by comprising the following steps:

a. spraying antistatic ink on a printing roller (1) according to a set position and carrying out pre-polishing and curing treatment;

b. preheating the substrate;

c. and (3) conveying the substrate subjected to pre-heating treatment between a printing roller (1) and a pressing roller (2) and transferring the antistatic release ink subjected to pre-photocuring treatment onto the substrate through imprinting.

2. The high-efficiency curing transfer printing digital roller printing process as claimed in claim 1, wherein:

the substrate is moved for a distance against the pressure roller (2) before embossing, and the substrate is preheated by heating the pressure roller (2).

3. The high-efficiency curing transfer printing digital roller printing process as claimed in claim 1, wherein:

the base material moves along the 45-60-degree direction of the deviation pressing roller (2) after being pressed.

4. The high-efficiency curing transfer printing digital roller printing process as claimed in claim 1, wherein: the antistatic ink is prepared by mixing and grinding pigment, polyurethane, rosin modified phenolic resin, trimethylolpropane tripalmitate, paraffin micro powder, polytetrafluoroethylene micro powder, animal cartilage powder, a photoinitiator, an antistatic agent, a defoaming agent and a solvent to a nanometer level.

5. The high efficiency curing transfer printing digital roller printing process of claim 4, wherein: the antistatic ink is prepared by mixing and grinding 5-14 parts of pigment, 18-36 parts of polyurethane, 2-11 parts of rosin modified phenolic resin, 1-5 parts of trimethylolpropane tripalmitate, 1-3 parts of paraffin micro powder, 1-3 parts of polytetrafluoroethylene micro powder, 0.5-1.5 parts of animal cartilage powder, 0.5-2 parts of photoinitiator, 0.2-2 parts of antistatic agent, 0.2-0.5 part of defoaming agent and 20-50 parts of solvent to 10-100nm in parts by weight.

6. The high efficiency curing transfer printing digital roller printing process as claimed in any one of claims 1-5, wherein: the thickness of antistatic ion type printing ink is 1-10 mu m, the ultraviolet irradiation that intensity is 80-90W/cm is adopted in the solid processing of light in advance, 0.1-0.3s, the solid processing of light in advance is ended and is less than 1s to the time that begins to carry out the impression.

7. The high efficiency curing transfer printing digital roller printing process of claim 6, wherein: the preheating temperature of the preheating treatment is 90-120 ℃.

8. An efficient curing transfer digital roller printing device for the process according to any one of claims 1 to 7, characterized in that: including printing roller (1) and pinch roller (2), have the impression clearance between printing roller (1) and pinch roller (2), the top of printing roller (1) is equipped with printing ink shower nozzle (3), and printing roller (1) turns to and is equipped with ultraviolet irradiation device (4) on pinch roller (2) one side route, be equipped with heating device (5) in pinch roller (2).

9. The high efficiency curing transfer printing digital roller printing apparatus of claim 8, wherein: the roller surfaces of the printing roller (1) and the pressing roller (2) are high-temperature-resistant rubber layers.

10. The high efficiency curing transfer printing digital roller printing apparatus of claim 8, wherein: the device is characterized in that a first guide roller group (6) is arranged on the upstream side of the pressing roller (2), the base material is tightly attached to the upstream side of the pressing roller (2) through the guide roller group (5) and is fed into the embossing gap, a second guide roller group (7) is arranged on the downstream side of the pressing roller (2), and the base material is fed out from the embossing gap and then moves in a direction of deflecting by 45-60 degrees towards one side of the pressing roller (2) through the second guide roller group (7).