Digital braille dot printing process

Abstract

The invention relates to a process for digitally printing braille dots, which belongs to the technical field of braille printing and comprises the following steps of: 1, counting the number of braille dots on a printing surface; the second step further comprises the steps that the thickness of the UV coating oil is increased when the number of the braille characters exceeds a threshold value, the thickness of the UV coating oil is reduced when the number of the braille characters is lower than the threshold value, digital white ink is printed on the printing face, and a digital white ink layer is formed. 2, printing UV coating oil on the surface of the digital white ink layer to form a UV coating oil layer; 3, printing braille alphabets on the surface of the UV coating oil layer by using gloss oil; and 4, curing the gloss oil to form braille alphabets.

Description

Technical Field

[0001] The invention belongs to the technical field of Braille printing, and in particular relates to a process for digitally printing Braille dots. Background Art

[0002] Braille is an information carrier that consists of a number of raised dots protruding from the paper surface and arranged in a certain order, making it convenient for blind people to obtain information through touch. Therefore, when printing Braille, it is usually necessary to set raised dots at corresponding positions on the paper surface in various ways.

[0003] The general Braille printing process is to press a template with protrusions on the surface onto the corresponding position of the paper surface. However, this type of printing requires the preparation of a template with protrusions. Once the printed content changes, it is necessary to flatten the existing protrusions on the template and then reset the protrusions corresponding to the new printed content. This requires a lot of work and low flexibility. Therefore, the prior art usually adopts ink printing technology, that is, forming Braille by making ink form protrusions on the surface of paper. For example, a Braille printing method disclosed in Chinese patent CN1944068A includes the following steps: 1) plate making, that is, applying a certain thickness of photosensitive glue and then exposing it, and then washing it to form a plate with a certain thickness of photosensitive glue. The invention relates to a method for printing braille by using a screen having a certain depth, the depth of which is not less than the national standard height for printing braille dots; 2) placing the screen on a substrate and printing UV light-curing varnish thereon; 3) UV-curing the substrate printed with the UV light-curing varnish thereon. By using UV light-curing varnish for braille printing, it not only overcomes the special requirements of paper that must be met by mechanical dotting, but also is simpler than the foaming ink process, and has the characteristics of fast printing speed, good fastness, colorless and transparent or adjustable color, and not afraid of heavy pressure, so that the UV light-curing varnish can be directly printed on a reading material with text, and can also be printed on both sides without affecting the printing quality;

[0004] However, in the above scheme, when the varnish for Braille printing is printed onto the paper surface and is not cured, there is a probability that the varnish will flow and diffuse. At this time, the ink cannot maintain the target shape, that is, it cannot be cured in the target shape, affecting the quality of Braille printing. Therefore, a digital printing Braille dot process with good varnish leveling and diffusion inhibition effect is needed. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a digital printing Braille dot process, which has the characteristics of good varnish leveling and diffusion inhibition effect.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A process for digitally printing Braille dots comprises the following steps:

[0008] Step 1: Printing digital white ink on the printing surface to form a digital white ink layer;

[0009] Step 2: Print UV coating oil on the surface of the digital white ink layer to form a UV coating oil layer;

[0010] Step 3: Print Braille on the surface of the UV coating oil layer using varnish;

[0011] Step 4: Solidify the varnish to form Braille.

[0012] As a preferred technical solution of the present invention, the step one also includes: counting the number of Braille characters on the printed surface; the step two also includes: increasing the thickness of the UV coating oil when the number of Braille characters exceeds a threshold, and reducing the thickness of the UV coating oil when the number of Braille characters is lower than the threshold.

[0013] As a preferred technical solution of the present invention, the step one also includes: counting the number of Braille characters S on the printed surface and calculating the thickness H of the UV coating oil layer; the step two also includes: printing UV coating oil on the surface of the digital white ink layer to form a UV coating oil layer with a thickness of H, wherein H=S / S0×H0.

[0014] As a preferred technical solution of the present invention, step one also includes: after calculating the thickness H of the UV coating oil layer, calculating the thickness B of the digital white ink layer, where B = [0.3log(100x-45)] × B0, x = S / S0, 0.5S0≤S≤2S0.

[0015] As a preferred technical solution of the present invention, the step one further includes: after calculating the thickness B of the digital white ink layer, calculating the weight coefficient M, and judging whether M is greater than M0, and when the judgment result is yes, correcting the thickness of the digital white ink layer downward.

[0016] As a preferred technical solution of the present invention, the step 1 further includes: after calculating the thickness B of the digital white ink layer, calculating the weight coefficient M, and judging whether M is greater than M0, when the judgment result is yes, correcting the digital white ink layer to M×A1, wherein A1=M0 / M×c, c is a preset constant;

[0017] As a preferred technical solution of the present invention, the step three also includes: during the process of printing Braille with varnish on the surface of the UV coating oil layer, the suction platform below the printing surface continuously sucks air.

[0018] The beneficial effects of the present invention are:

[0019] (1) By setting the digital white ink layer and the UV coating oil layer, the probability of varnish leveling and diffusion can be reduced, and the effect of inhibiting varnish leveling and diffusion can be improved;

[0020] (2) By counting the number of Braille characters on the printed paper, increasing the thickness of the UV coating oil layer when the number of Braille characters exceeds a threshold, and reducing the thickness of the UV coating oil layer when the number of Braille characters is below the threshold, the probability that the UV coating oil layer cannot inhibit leveling when there are many Braille characters is reduced, thereby improving the leveling and diffusion inhibition effect of the varnish. At the same time, when the number of Braille characters is small, the thickness of the UV coating oil layer is reduced, thereby reducing the overall weight of the printed carrier and improving reading convenience;

[0021] (3) When the thickness of the UV coating oil layer is large, the digital white ink layer thickness is increased, and when the thickness of the UV coating oil layer is small, the digital white ink layer thickness is reduced, so that when the thickness of the UV coating oil layer is large and strong adhesion is required, the coverage of the digital white ink layer on the printing surface is increased, thereby improving the adhesion, and when the thickness of the UV coating oil layer is small and strong adhesion is not required, the digital white ink layer thickness is reduced, thereby reducing the weight of the printing carrier; BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0023] Figure 1 It is a structural schematic diagram of the coding module of the present invention.

[0024] Description of main component symbols:

[0025] In the figure: 1. inkjet coding module; 11. paper feeding station; 12. guide mechanism; 13. inkjet coding mechanism; 14. material receiving table; 15. curing lamp. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0027] See also Figure 1 , a process for digitally printing Braille dots, comprising the following steps:

[0028] Step 1: Printing digital white ink on the printing surface to form a digital white ink layer;

[0029] Specifically, the printed paper or other carrier carrying Braille to be printed is placed in the station of a digital printer capable of inkjet printing, and the digital printer evenly sprays and prints a layer of digital white ink on the printing surface, so that a layer structure formed by a layer of digital white ink is formed on the printing surface;

[0030] In Braille printing, varnish needs to be printed at the positions corresponding to the Braille particles, and after the varnish is printed, the liquid varnish solidifies to form solid Braille particles;

[0031] When the varnish for Braille printing is printed on the paper surface and has not been cured, there is a probability that the varnish will flow and spread on the printing surface. At this time, the ink cannot maintain the target shape, that is, it cannot be cured in the target shape, which affects the quality of Braille printing;

[0032] When varnish is printed on digital white ink that has a large friction force and is insoluble in varnish, the probability of varnish leveling and diffusion is small due to the large friction force, and the probability of Braille deformation is small;

[0033] After step 1 is completed, proceed to step 2.

[0034] Step 2: Print UV coating oil on the surface of the digital white ink layer to form a UV coating oil layer;

[0035] Specifically, in step 2, the printing surface printed with the digital white ink layer is placed in the station of the UV coating oil that can be printed by inkjet, and the digital printer evenly sprays and prints a layer of UV coating oil on the printing surface, so that an x-layer structure formed by a layer of UV coating oil is formed on the printing surface;

[0036] Since UV coating oil is also insoluble in varnish and the formed layer structure has greater friction, by providing a digital white ink layer and a UV coating oil layer, the probability of varnish leveling and diffusion can be reduced, thereby improving the effect of inhibiting varnish leveling and diffusion.

[0037] After step 2 is completed, step 3 is performed: printing Braille on the surface of the UV coating oil layer using varnish. Specifically, in step 1, the operator designs the Braille content in advance, and inputs the position where the varnish needs to form Braille particles into the digital printer according to the Braille content to be printed, and the digital printer prints the varnish to the corresponding position;

[0038] In this embodiment, the primer in step 3 includes the following components by weight percentage: 60-80% polyester acrylic resin, 10-20% silicon-modified polyurethane acrylic resin, 2-4% filler, 6-10% composite photoinitiator, 0.1-0.2% water repellent, 0.5-1% leveling agent, and 0.05-0.1% inhibitor;

[0039] At the same time, in this embodiment, the coding module 1 performing step three includes at least a paper feeding station 11, a guide mechanism 12, a coding mechanism 13 and a receiving table 14 arranged along a straight line, and the printing carrier enters the coding module 1 at the paper feeding station 11, then passes under the coding mechanism 13 through the guide mechanism 12, and then enters the receiving table 14;

[0040] After step 3 is completed: step 4 is performed: the varnish is solidified to form braille;

[0041] Specifically, a curing lamp 15 is provided between the inkjet module 1 and the material receiving table 14. The printed paper or other carrier carrying Braille printed with varnish is passed through the curing lamp 15, and the varnish is cured by ultraviolet irradiation to form solid Braille particles, thereby completing Braille printing.

[0042] In the above steps 2 and 3, the purpose of setting the UV coating oil layer and the digital white ink layer on the printing surface is to utilize their own properties to increase the friction between the varnish and the contact surface and reduce the probability of the varnish leveling and diffusion; when printing the UV coating oil layer and the digital white ink layer, the operator needs to preset the thickness of the UV coating oil layer and the digital white ink layer. When the set thickness is larger, more UV coating oil and digital white ink are printed on the printing surface;

[0043] However, when the set thickness of the UV coating oil layer or the digital white ink layer is too low, there is a probability that too little UV coating oil and digital white ink are printed, and the UV coating oil layer or the digital white ink layer is sprayed by the nozzle onto the printing surface. Therefore, when the printed UV coating oil and digital white ink are less, there is a probability that the UV coating oil and the digital white ink cannot completely cover the printing layer, that is, there are gaps. At this time, when the number of Braille characters printed on the printing layer is large, there is a greater probability that the Braille characters overlap with the gaps. At this time, the UV coating oil layer or the digital white ink layer cannot prevent the varnish from leveling. Therefore, when the number of Braille characters is large, the set thickness of the UV coating oil layer or the digital white ink layer needs to be increased;

[0044] On the contrary, when the number of braille characters to be printed is small, the probability of the braille characters overlapping with the vacant parts is lower. When the set thickness of the UV coating oil layer or the digital white ink layer is too high, there is a probability that the overall weight of the printed carrier will be affected, making it inconvenient to read. Therefore, when the number of braille characters is small, there is no need to increase the set thickness of the UV coating oil layer or the digital white ink layer.

[0045] To this end, step one also includes: the operator counts the number of braille characters on the printed paper in advance, determines whether the number of braille characters exceeds a threshold, and then in step two, during the UV coating process, increases the thickness of the UV coating oil when the number of braille characters exceeds the threshold, and decreases the thickness of the UV coating oil when the number of braille characters is below the threshold;

[0046] Specifically, one printing content is regarded as a printing batch. When each printing batch performs the first printing process, in step 1, the operator counts the number of Braille characters M on the printing paper in advance, calculates the thickness of the UV coating oil layer H=S / S0×H0, and then presets the thickness of the UV coating oil layer of the current batch;

[0047] When the number of braille characters M is large, it means that there is a greater probability that the braille characters of this batch of printed braille characters overlap with the vacant parts, which means that the thickness of the UV coating oil on the surface of this batch of printed surfaces needs to be increased. At this time, the calculated UV coating oil layer thickness H=S / S0×H0 is large, and the set thickness of the UV coating oil layer is set to H. When a UV coating oil layer with a thickness of H is formed in step 2, the thickness of the UV coating oil layer is increased when the number of braille characters S is large.

[0048] Similarly, when the number of braille characters S is small, it means that the probability of the braille characters printed in this batch overlapping with the vacant parts is small, which means that there is no need to increase the thickness of the UV coating oil on the surface of the printing surface of this batch. At this time, the calculated UV coating oil layer thickness H=S / S0×H0 is small, and the set thickness of the UV coating oil layer is set to H. When a UV coating oil layer with a thickness of H is formed in step 2, the thickness of the UV coating oil layer is reduced when the number of braille characters S is small.

[0049] By counting the number of Braille characters on the printed paper and increasing the thickness of the UV coating oil layer when the number of Braille characters exceeds a threshold, and reducing the thickness of the UV coating oil when the number of Braille characters is lower than the threshold, the probability that the UV coating oil layer cannot play a role in inhibiting leveling when there are many Braille characters is reduced, thereby improving the leveling diffusion inhibition effect of the varnish. At the same time, when the number of Braille characters is small, the thickness of the UV coating oil layer is reduced, thereby reducing the overall weight of the printed carrier and improving reading convenience.

[0050] In the above scheme, the thickness of the UV coating oil layer is directly proportional to the number of Braille characters, and the digital white ink layer passes between the UV coating oil layer and the printing surface, so the adhesion of the UV coating oil layer depends on the digital white ink layer. When the thickness of the UV coating oil layer is thicker, there is a greater probability that it will fall off from the digital white ink layer, and when the thickness of the digital white ink layer is thinner, there is a probability that part of the printing surface area is not covered by the digital white ink layer, and the adhesion is reduced. Therefore, it is necessary to improve the adhesion of the digital white ink layer, that is, it is necessary to increase the thickness of the digital white ink layer. Similarly, when the thickness of the UV coating oil layer is thinner, if the thickness of the digital white ink layer is thicker, there is a probability that the overall weight of the printed carrier is affected, which is inconvenient to read;

[0051] To this end, step one further includes: after calculating the thickness H of the UV coating oil layer, calculating the thickness B of the digital white ink layer, where B = [0.3log (100x-45)] × B0, x = S / S0, 0.5S0≤S≤2S0;

[0052] Before a batch of printing begins, in step 1, the operator counts the number of Braille characters S on the printed paper in advance, calculates the thickness of the UV coating oil layer H=S / S0×H0, then presets the thickness of the UV coating oil layer of the current batch, and then calculates the thickness B of the digital white ink layer. After the calculation is completed, the digital white ink is printed on the printing surface to form a digital white ink layer with a thickness of B;

[0053] When the number of braille characters S is large, close to 2S0, it means that the thickness of the UV coating oil layer H is large. At this time, the thickness of the digital white ink layer B needs to be increased accordingly. At this time, the value of B=[0.3log(100x-45)]×B0 is large. When the thickness of the UV coating oil layer is large, the thickness of the digital white ink layer is increased.

[0054] When the number of braille characters S is small, close to 0.5S0, it means that the thickness H of the UV coating oil layer is small. At this time, there is no need to increase the thickness B of the digital white ink layer accordingly. At this time, the value of B = [0.3log(100x-45)] × B0 is small, and the thickness of the digital white ink layer is reduced when the thickness of the UV coating oil layer is small.

[0055] By increasing the thickness of the digital white ink layer when the thickness of the UV coating oil layer is large, and reducing the thickness of the digital white ink layer when the thickness of the UV coating oil layer is small, the coverage of the digital white ink layer on the printing surface is increased when the thickness of the UV coating oil layer is large and strong adhesion is required, thereby improving the adhesion, and reducing the thickness of the digital white ink layer when the thickness of the UV coating oil layer is small and strong adhesion is not required, thereby reducing the weight of the printing carrier;

[0056] At the same time, since B = [0.3log(100x-45)] × B0 is close to the upper limit value of 0.66 when S is close to the upper limit value 2S0, as the number of Braille characters increases, the thickness of the digital white ink layer has an upper limit, which reduces the probability that the digital white ink layer is too thick and affects the weight of the printed carrier.

[0057] In the above scheme, although there is an upper limit to the thickness of the digital white ink layer, in some cases, the number of braille characters on the same printing surface is large, resulting in that although there is an upper limit to the thickness of the digital white ink layer, the overall structure after braille printing is still heavy under the influence of more braille characters, and the digital white ink layer is between the UV coating oil layer and the printing surface, and has little effect on the adhesion of the braille characters. Therefore, when the overall weight is large, it is necessary to appropriately reduce the set thickness of the digital white ink layer. For this purpose, in step 1, at the beginning of a batch of printing, after calculating the thickness B of the digital white ink layer, calculate the weight coefficient M, and determine whether M is greater than M0. When the determination result is yes, the digital white ink layer is corrected to M×A1, where A1=M0 / M×c, and c is a preset constant;

[0058] In this embodiment, the weight coefficient M is calculated as follows: presetting the standard weight Mb, the standard UV coating oil layer thickness H0 and the standard digital white ink layer thickness B0, and then calculating the value of M=Mb×S / S0×H / H0×B / B0. When the number of braille characters S, the UV coating oil layer thickness H and the digital white ink layer thickness B are larger, the overall weight is larger, and the weight coefficient M is larger at this time.

[0059] When the weight coefficient M is greater than M0, it means that the weight is large and the thickness of the digital white ink layer needs to be reduced. At this time, A1=M0 / M×c is small. When the correction of the digital white ink layer is M×A1, the thickness of the digital white ink layer is corrected downward;

[0060] When the weight coefficient M is close to M0, it means the weight is small and there is no need to reduce the thickness of the digital white ink layer. At this time, A1 = M0 / M×c is large. When the correction of the digital white ink layer is M×A1, the thickness of the digital white ink layer is maintained.

[0061] By correcting the thickness of the digital white ink layer downward when M is greater than M0, the thickness of the digital white ink layer that has a smaller impact on the adhesion of the Braille characters can be reduced when the overall weight is large, thereby reducing the overall weight and maintaining the thickness of the digital white ink layer when the weight coefficient M is small, thereby maintaining the adhesion.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A digital printing braille dot process, characterized in that: The following steps are involved: Step 1: Printing digital white ink on the printing surface to form a digital white ink layer; Step 2: Print UV coating oil on the surface of the digital white ink layer to form a UV coating oil layer; Step 3: Print Braille on the surface of the UV coating oil layer using varnish; Step 4: Solidify the varnish to form Braille.

2. A digital printing Braille dot process according to claim 1, characterized in that: The step one also includes: counting the number of Braille characters on the printed surface; the step two also includes: increasing the thickness of the UV coating oil when the number of Braille characters exceeds a threshold, and reducing the thickness of the UV coating oil when the number of Braille characters is lower than the threshold.

3. A digital printing Braille dot process according to claim 1, characterized in that: The step one also includes: counting the number of Braille characters S on the printed surface and calculating the thickness H of the UV coating oil layer; the step two also includes: printing UV coating oil on the surface of the digital white ink layer to form a UV coating oil layer with a thickness of H, where H=S / S0×H0.

4. A digital printing Braille dot process according to claim 2, characterized in that: The step one also includes: after calculating the thickness H of the UV coating oil layer, calculating the thickness B of the digital white ink layer, where B=[0.3log(100x-45)]×B0, x=S / S0, 0.5S0≤S≤2S0.

5. A digital printing Braille dot process according to claim 3, characterized in that: The step 1 further includes: after calculating the thickness B of the digital white ink layer, calculating the weight coefficient M, and determining whether M is greater than M0, and when the determination result is yes, correcting the thickness of the digital white ink layer downward.

6. A digital printing Braille dot process according to claim 4, characterized in that: The step 1 further includes: after calculating the thickness B of the digital white ink layer, calculating the weight coefficient M, and judging whether M is greater than M0, when the judgment result is yes, correcting the digital white ink layer to M×A1, wherein A1=M0 / M×c, c is a preset constant.

7. A digital printing Braille dot process according to claim 1, characterized in that: The step three also includes: in the process of printing Braille with varnish on the surface of the UV coating oil layer, the suction platform below the printing surface continuously sucks air.

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