TW202402554A - Transfer printing method of uv digital printing - Google Patents

Abstract

容後補呈

Description

A transfer method for UV digital printing

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

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 applications. In the industrial field, it is used to increase the visual effect of the appearance of goods, and 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 have gradually become the mainstream of digital image output. However, UV digital printing machines still cannot overcome the limitations of traditional digital printing machines. 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 There are special types of inkjet heads that 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 printing 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.

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

The main purpose of the present invention is to provide a method that is easy to process, low in 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. UV digital printing transfer method.

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: Use UV ink to inkjet 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-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 processing 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 irradiated through a UV lamp for full curing.

During implementation, the following steps should be 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. Perform 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, and the curing irradiation energy of the UV lamp in step b1 is such that the transparent UV ink can be completely cured. 1-10% of the lowest energy.

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

During implementation, 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 structure and content of the present invention and the effects achieved are described in detail as follows.

Please refer to Figures 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 UV digital printing transfer method, 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 color 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 that have low bonding reliability with the ink. The semi-curing irradiation energy of the UV lamp in step b can completely cure the transparent UV ink. 30-60% of minimum energy.

Therefore, during implementation, taking the processing 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 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 color UV ink is completely cured), and then on the pattern layer 2, it is transparently The color UV ink mirror outputs a first transparent color ink layer 3, and during the inkjet output, it is simultaneously irradiated by a UV lamp for semi-curing. At this time, the first transparent color ink layer 3 has a certain viscosity in the semi-cured state. Therefore, when the pattern layer 2 on the carrier 1 is finally pressed and transferred to the processing object 4, 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. The object 4 is processed so that a positive pattern appears on the 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 with white UV inkjet mirror image on the pattern layer 2, and fully cured and irradiated by a UV lamp. 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 Figures 4 and 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 color 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 with transparent UV ink, and after the inkjet output, use the UV lamp lower than that in step b irradiation energy. 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 at which the transparent UV ink can be completely cured, and the curing irradiation energy of the UV lamp in step b1 is 50-80% of the lowest energy at which the transparent UV ink can be completely cured. 1-10% of lowest energy. Of course, in step a, after the pattern layer 2 is cured, a white UV inkjet mirror image can be used to output a white ink layer 5 on the pattern layer 2, and fully cured and irradiated by a UV lamp, so that 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.

In this way, the present invention takes advantage of the poor reliability of UV ink on certain materials (such as release paper, silicone pads, PP films, Teflon films, etc.), and first prints the graphics to be output on these release carrier materials. Mirror the pattern, and then use the above steps to print a layer of viscous semi-cured or slightly cured ink layer, then press the pattern on the curved surface or object to be transferred, and finally remove the release material. The transfer process can be completed. Since semi-cured or micro-cured ink has continuous reaction characteristics, good adhesion can be obtained after being left for several hours. Alternatively, it can be cured directly with UV light source after transfer, and good adhesion can be obtained immediately. Therefore, for curved surfaces that cannot be directly printed, or larger objects that cannot be directly placed on the printer, patterns can be effectively and quickly formed on the processed objects through the method of the present invention.

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, and they can still be regarded as equivalent changes to the concept of the present invention. The resulting The effect 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 is filed in accordance with the law. Apply.

1: Carrier 2:Pattern layer 3: First transparent ink layer 4: Processing objects 5: White ink layer 6: Second transparent ink layer Step a: Use UV ink to inkjet on a carrier that has low reliability with UV ink, mirror the image to output a pattern layer, and fully cure and irradiate it through a 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. perform irradiation Step c: Finally, press and transfer the pattern layer on the carrier onto a processed object

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 after the pattern layer 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. FIG. 5 is a schematic diagram of the steps of a transfer method according to another embodiment of the present invention.

Step a: Use UV ink to inkjet on a carrier that has low reliability with UV ink, mirror the image to output a pattern layer, and fully cure and irradiate it through a 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 c: Finally, press and transfer the pattern layer on the carrier onto a processed object

Claims (7)

A UV digital printing transfer method includes the following steps: Step a: Use UV ink to inkjet 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-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 processing object. A UV digital printing transfer method as described in 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 completely cured. A transfer method for UV digital printing as described in claim 1, wherein in step a, after the pattern layer is cured, a white UV inkjet mirror image can be used to output a white ink layer on the pattern layer, and the UV The lamp is fully cured and irradiated. A UV digital printing transfer method as described in claim 1 or 3, further comprising: 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. Perform irradiation. A UV digital printing transfer method as described in claim 4, wherein 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, and in step b1 The curing irradiation energy of the UV lamp is 1-10% of the lowest energy that can completely cure the transparent UV ink. A UV digital printing transfer method as described in claim 1, wherein the carrier system is a release film, a silicone pad, a PP film, a Teflon film, or other materials that have low bonding reliability with the ink. A UV digital printing transfer method as described in claim 1, wherein the UV ink in step a includes color, black and white and other color inks.

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