CN117429192A - A transfer method for UV digital printing - Google Patents

Abstract

The invention provides a transfer printing method of UV digital printing, which is mainly characterized in that UV ink is used for jetting ink on a carrier with low firmness, a pattern layer is output in a mirror image mode, then the pattern layer is fully cured and irradiated by a UV lamp, then a first transparent ink layer is output in a mirror image mode by transparent UV ink on the pattern layer, and when the UV ink is output in the jet mode, the pattern layer on the carrier is finally transferred onto a processing object in a pressurizing mode through the semi-curing irradiation of the UV lamp.

Description

A transfer method for UV digital printing

Technical field

The present invention relates to a transfer method for UV digital printing, in particular to providing a method that can transfer printed graphics directly to a curved surface that cannot be directly printed, or that cannot be directly placed on the printing surface. on larger objects on the machine.

Background technique

Due to the advancement of printing technology, today's printing equipment can print on the upper surface of soft materials to be printed (such as paper, cloth or other textiles) or hard materials to be printed (such as plastic, metal, glass or ceramics), making it widely used In various industrial fields, to increase the visual effect of the appearance of goods, today's printing methods mainly include traditional printing and digital printing.

Since UV digital printing can be applied to a variety of materials, and UV inks are more environmentally friendly than solvent-based inks, they have been widely used and gradually become the mainstream of digital image output. However, UV digital printing machines still cannot overcome the traditional digital printing machine can only The limitation of printing on flat objects is that digital printing on simple curved surfaces (the highest and lowest points of the curved surface do not exceed 3 mm) can only be achieved in one direction and with large ink droplets at a low printing speed, and only with special Types of inkjet heads can do this, and the curved surface will also reflect the UV curing light source during the printing process, increasing the damage rate of the inkjet head. In addition, due to the physical limitations of the ink droplet ejection path, not all curved surfaces in different directions on the object can achieve the same printing effect, and due to the larger ink droplets, the resolution of the printed graphics is lower than the general print quality. Therefore the above method is not widely used. In addition, there are other methods of printing on special materials and then transferring or heat transfer printing, but the process is more complicated and requires the cooperation of special materials or additional equipment (such as a hot peritoneal machine or a heat press, etc...) Implementation.

Contents of the invention

Although the industry has proposed several methods to overcome this inherent limitation, some of these methods must sacrifice printing quality and productivity, and some require the use of special materials and other processing equipment to indirectly perform transfer or transfer through complex procedures. Therefore, how to effectively solve the printing problem on objects with special curved surfaces or larger objects that cannot be directly placed on a printer has been the research direction of the inventor.

The main purpose of the present invention is to provide a UV device that has an easy process, low cost, and can quickly and effectively transfer printed graphics to curved surfaces that cannot be directly printed or on larger objects that cannot be directly placed on a printer. Transfer methods for digital printing.

In order to achieve the above purpose, the present invention provides a UV digital printing transfer method, which mainly includes the following steps:

Step a: Inkjet with UV ink on a carrier with low fastness to UV ink, mirror output a pattern layer, and fully cure and irradiate it through a UV lamp;

Step b: On the above-mentioned pattern layer, a first transparent ink layer is output as a mirror image of transparent UV ink, and during the inkjet output, it is simultaneously irradiated by a UV lamp for semi-curing;

Step c: Finally, the pattern layer on the carrier is pressed and transferred onto a processed object.

During implementation, the semi-curing irradiation energy of the UV lamp in step b is 30-60% of the lowest energy that can completely cure the transparent UV ink.

When implemented, in step a, after the pattern layer is cured, a white ink layer can be outputted with white UV inkjet mirror image on the pattern layer, and fully cured and irradiated by a UV lamp.

During implementation, the following steps are included between step b and step c:

Step b1: On the first transparent ink layer in step b, use transparent UV ink to mirror-output a second transparent ink layer, and after the inkjet output, use a lower UV lamp irradiation energy than in step b. irradiation.

During implementation, the semi-curing irradiation energy of the UV lamp in step b is 50-80% of the lowest energy that can completely cure the transparent UV ink, while the curing irradiation energy of the UV lamp in step b1 is the lowest energy that the transparent UV ink can fully cure. 1-10% of the lowest energy.

During implementation, the carrier is a release film, silicone pad, PP film, Teflon film and other materials that have low bonding reliability with the ink.

When implemented, the UV ink in step a includes color, black and white and other color inks.

In order to further understand the present invention, the following is a preferred embodiment, and together with the drawings and figure numbers, the specific composition of the present invention and the effects achieved are described in detail as follows.

Description of the drawings

Figure 1 is a flow chart of a transfer method according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the three-dimensional appearance of the pattern layer after it is transferred to the processed object in the embodiment of the present invention;

Figure 3 is a schematic diagram of the steps of the transfer method according to the embodiment of the present invention;

Figure 4 is a flow chart of a transfer method according to another embodiment of the present invention;

Figure 5 is a schematic diagram of the steps of a transfer method according to another embodiment of the present invention.

Explanation of reference numbers:

1: Carrier

2: Pattern layer

3: First transparent ink layer

4: Processing objects

5: White ink layer

6: Second transparent ink layer

Step a: Inkjet with UV ink on a carrier with low fastness to UV ink, mirror output a pattern layer, and fully cure and irradiate it through UV lamp

Step b: On the above pattern layer, a first transparent ink layer is output as a mirror image of transparent UV ink, and during the inkjet output, it is simultaneously irradiated by a UV lamp for semi-curing

Step b1: On the first transparent ink layer in step b, use transparent UV ink to mirror-output a second transparent ink layer, and after the inkjet output, use a lower UV lamp irradiation energy than in step b. irradiate

Step c: Finally, press and transfer the pattern layer on the carrier to a processed object

Detailed ways

Please refer to FIGS. 1 to 3 , which are flow charts of a UV digital printing transfer method according to an embodiment of the present invention.

The present invention provides a transfer method for UV digital printing, which mainly includes the following steps:

Step a: Inkjet with UV ink on a carrier 1 that has low reliability with UV ink, mirror output a pattern layer 2, and fully cure and irradiate it through a UV lamp;

Step b: On the above-mentioned pattern layer 2, a first transparent ink layer 3 is output as a mirror image of transparent UV ink, and during the inkjet output, it is simultaneously irradiated by a UV lamp for semi-curing;

Step c: Finally, the pattern layer 2 on the carrier 1 is pressed and transferred onto a processing object 4 .

Among them, the UV ink in step a includes color, black and white and other color inks. The carrier 1 is a release film, silicone pad, PP film, Teflon film and other materials with low bonding fastness with the ink. The semi-curing irradiation energy of the UV lamp in step b is the lowest that can completely cure the transparent UV ink. 30-60% of energy.

Therefore, during implementation, taking the processed object 4 in Figure 2 as a block structure with a large curved surface as an example, first inkjet UV ink (such as color UV ink) on the carrier 1 (release film), and print the parts to be printed on the carrier 1 (release film). The pattern layer 2 on the processed object 4 is output on the carrier 1 (release film) in a mirror image manner, and is fully cured and irradiated by a UV lamp (that is, the colored UV ink is completely cured), and then on the pattern layer 2, it is printed with a transparent color The UV ink mirror image outputs a first transparent ink layer 3, and during the inkjet output, it is irradiated by a UV lamp for semi-curing. At this time, the first transparent ink layer 3 has a certain viscosity in the semi-cured state. Therefore, when the pattern layer 2 on the carrier 1 is finally transferred to the processing object 4 under pressure, the first transparent ink layer 3 is used to adhere to the processing object 4, so that the pattern layer 2 is completely transferred to the processing object 4. on the object 4, so that a positive pattern appears on the processed object 4.

In addition, as shown in Figure 3, in step a, after the pattern layer 2 is cured, a white ink layer 5 can be outputted on the pattern layer 2 with a white UV inkjet mirror image, and fully cured and irradiated by a UV lamp, thereby During transfer, the pattern layer 2 can appear on the white ink layer 5 , making the transfer process smoother and protecting the integrity of the pattern layer 2 .

In order to make the pattern layer have better smoothness and flatness, it can be achieved by adding transparent ink during the process, as shown in Figure 4 and Figure 5. The complete process steps are as follows:

Step a: Inkjet with UV ink on a carrier 1 that has low reliability with UV ink, mirror output a pattern layer 2, and fully cure and irradiate it through a UV lamp;

Step b: On the above-mentioned pattern layer 2, a first transparent ink layer 3 is output as a mirror image of transparent UV ink, and during the inkjet output, it is simultaneously irradiated by a UV lamp for semi-curing;

Step b1: On the first transparent ink layer 3 in step b, a second transparent ink layer 6 is output as a mirror image of the transparent UV ink, and after the inkjet output, irradiate with the UV lamp lower than that in step b energy irradiation.

Step c: Finally, the pattern layer 2 on the carrier 1 is pressed and transferred onto a processing object 4 .

Among them, the semi-curing irradiation energy of the UV lamp in step b is 50-80% of the lowest energy that the transparent UV ink can be completely cured, and the curing irradiation energy of the UV lamp in step b1 is the lowest energy that the transparent UV ink can be fully cured. 1-10% of lowest energy. Of course, in step a, after the pattern layer 2 is cured, a white ink layer 5 can be outputted on the pattern layer 2 with a white UV inkjet mirror image, and fully cured and irradiated by a UV lamp. When transferring, the pattern layer 2 can appear on the white ink layer 5, making the transfer process smoother and protecting the integrity of the pattern layer 2.

Therefore, during transfer, since the second transparent ink layer 6 has a certain viscosity in a slightly solidified state, when the pattern layer 2 on the carrier 1 is finally pressed and transferred to the processing object 4, That is, the second transparent ink layer 6 can be used to adhere to the processed object 4, so that the pattern layer 2 is completely transferred to the processed object 4, so that a positive pattern appears on the processed object.

Therefore, the present invention takes advantage of the poor reliability of UV ink on certain materials (such as release paper, silicone pad, PP film, Teflon film, etc...), and first prints the desired output on these release carrier materials. To mirror a graphic, use the above steps to print a layer of viscous semi-cured or slightly cured ink layer, then press the graphic onto the curved surface or object to be transferred, and finally remove the release material to complete. In the transfer process, due to the continuous reaction characteristics of semi-cured or micro-cured inks, good adhesion can be obtained after being left for a few hours, or good adhesion can be obtained immediately by curing with UV light source directly after transfer. For curved surfaces that cannot be directly printed, or for larger objects that cannot be directly placed on a printer, the method of the present invention can be used to effectively and quickly form patterns on the processed objects.

The above are specific embodiments of the present invention and the technical means used. Many changes and modifications can be derived based on the disclosure or teachings of this article, which can still be regarded as equivalent changes to the concept of the present invention. The effect produced does not exceed the essential spirit covered by the description and drawings, and should be regarded as within the technical scope of the present invention and shall be stated in advance.

In summary, based on the content disclosed above, the present invention can clearly achieve the intended purpose of the invention and provide a transfer method for UV digital printing, which is highly practical and of industrial utilization value. An invention patent application is filed in accordance with the law. .

Claims (7)

1. A transfer method for UV digital printing, which includes the following steps: Step a: Inkjet with UV ink on a carrier with low fastness to UV ink, mirror the image output pattern layer, and fully cure and irradiate it through a UV lamp; Step b: On the above-mentioned pattern layer, the first transparent color ink layer is output as a mirror image of the transparent color UV ink, and during the inkjet output, it is simultaneously irradiated by a UV lamp for semi-curing; Step c: Finally, press and transfer the pattern layer on the carrier to the object to be processed. 2. The UV digital printing transfer method according to claim 1, wherein the semi-curing irradiation energy of the UV lamp in step b is 30-60% of the lowest energy at which the transparent UV ink can be fully cured. 3. The transfer method of UV digital printing according to claim 1, wherein in step a, after the pattern layer is cured, a white ink layer can be outputted as a white UV inkjet mirror image on the pattern layer, and passed through UV lamp full curing irradiation. 4. The transfer method of UV digital printing according to claim 1 or 3, wherein between step b and step c, it also includes: Step b1: On the first transparent ink layer in step b, use transparent UV ink to mirror-output the second transparent ink layer, and after the inkjet output, irradiate with a lower UV lamp irradiation energy than in step b. . 5. The transfer method of UV digital printing according to claim 4, wherein the semi-curing irradiation energy of the UV lamp in step b is 50-80% of the lowest energy that the transparent UV ink can be fully cured, and step b1 The curing irradiation energy of the medium UV lamp is 1-10% of the lowest energy that can completely cure the transparent UV ink. 6. The transfer method of UV digital printing according to claim 1, wherein the carrier is a release film, a silicone pad, a PP film, a Teflon film, or other materials that have low bonding fastness with the ink. 7. The UV digital printing transfer method according to claim 1, wherein the UV ink in step a includes color, black and white and other color inks.