CN107953659A - The manufacture method and its production equipment of a kind of relief printing block - Google Patents

Abstract

The invention discloses a method for manufacturing a letterpress printing plate and its production equipment, belonging to the technical field of printing plate making. Its production equipment includes printing plates, transfer printing equipment and drying units. The manufacturing method is as follows: install the imaged lithographic printing plate on the matching printing plate cylinder, first apply the dampening solution to the printing plate through the transfer printing equipment, and then print the solidified material on the printing plate after the dampening solution is applied. , so that the part of the graphic and text is transferred to the curing material, and finally dried by a photocuring drying device to form a graphic and text information bearing area to obtain a letterpress printing plate. The invention adopts the principle of addition to repeatedly transfer the solidified material on the printing plate, without exposure and development, without imposition and revision, and its dot reproducibility is good, and it can directly output a large format; eliminating the need for darkroom film washing, revision, and printing plate and other complicated operations; can easily obtain flat-top dots, and the pressure control is easier and more stable during the letterpress printing process, with high image stability and small image transfer errors.

Description

A kind of manufacturing method of letterpress printing plate and its production equipment

technical field

The invention belongs to the technical field of printing and plate making, and in particular relates to a method for manufacturing a letterpress printing plate and production equipment thereof.

Background technique

Letterpress printing is printing using a printing plate with raised graphics and text, and is one of the main printing processes. In letterpress printing, the ink supply device of the printing machine first distributes the ink evenly, and then transfers the ink to the printing plate through the ink roller. Since the graphic part on the letterpress plate is much higher than the non-graphic part on the printing plate, therefore, The ink on the ink roller can only be transferred to the graphic part of the printing plate, and the non-graphic part has no ink. The paper feeding mechanism of the printing machine transports the substrate to the printing part of the printing machine. Under the joint action of the printing plate device and the embossing device, the ink of the graphic part of the printing plate is transferred to the substrate, thus completing the printing of a printed matter. print.

The printing plates used in letterpress printing can be divided into two categories, one is rigid printing plates such as copper-zinc plates, movable type plates, and stereotypes; the other is high-polymer printing plates such as photoresin plates, rubber letterpress plates, and letterpress plates. The copper-zinc plate is to copy the picture and text on the original manuscript into a positive negative image negative film by means of photography, and then expose the picture and text on the negative film to the copper plate or zinc plate coated with a photosensitive film, and then develop and harden the film. , and then corrode the blank part of the layout with corrosive solution to obtain a printing plate with relief-like graphics. In movable typesetting, the copper-zinc plate is generally fixed on a special wooden support or a special metal support by means of iron nails or pasting, and combined with movable type to form a printing plate. In lead plate making, the copper-zinc plate and the movable type are pressed together into a paper pattern and cast into a lead plate. The traditional letterpress process uses film imaging and photosensitive resin. The plate making process includes: original manuscript→electronic color separation or photography→positive and negative images→back exposure→main exposure→developing and washing→drying→post-processing→post-exposure→plate. The above three traditional letterpress plates have a long process, so there are many influencing factors. The laser engraved letterpress plate is the main competitor of the photosensitive letterpress plate. The laser engraved letterpress plate cannot be used handy, and the process of plate making produces ablation dust. The photosensitive letterpress plate is still an important material in the printing industry. Traditional hand-engraved letterpress can only be used in low-end printing due to poor image quality and low labor efficiency. The CTP flexographic plate is the latest achievement of Toppan. Because it no longer uses negative film exposure imaging, it can obtain finer dots, but some inherent shortcomings of flexo printing have not been well resolved. Oxygen reaction makes it impossible to achieve 1:1 copying of graphics and text, and the top of the high-gloss dots is round. This kind of dome dot is more sensitive to printing pressure, and the phenomenon of dot gain is more serious, and it is easy to fall into the mesh, and when printing non-absorbent materials such as film, it is easy to cause ink coverage and white spots on the solid part. Phenomenon.

Therefore, how to overcome the above technical problems has become an urgent technical problem to be solved by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a method for manufacturing a letterpress printing plate and its production equipment, which can completely solve the above-mentioned deficiencies in the prior art.

The purpose of the present invention is achieved through the following technical solutions:

A method of manufacturing a letterpress printing plate, comprising the following steps:

1) The plate-making information is processed by a computer, and the printing plate material containing the graphic part is obtained through the existing offset printing CTP output;

2) Install the printing plate on the matching plate cylinder;

3) After installation, attach the dampening roller to the printing plate, start the printing plate cylinder, and apply dampening solution to the printing plate through the dampening roller;

4) After applying the dampening solution, remove the water form roller, attach the ink form roller to the printing plate, and transfer the solidified material to the printing plate through the ink form roller;

5) After the cured material is coated, the surface of the cured material transferred on the printing plate is cured by using a light curing drying device to form a graphic information bearing area to obtain a letterpress printing plate.

Preferably, in the step 3), the dampening solution is transferred to the dampening roller through the water bucket roller, the water transfer roller and the water uniform roller in sequence.

Preferably, the fountain solution in step 3) is a conventional lithographic fountain solution.

Preferably, in step 4), one rotation of the printing plate is regarded as one rotation, and the cured material is coated on the printing plate for 100-1000 times.

Preferably, the curing material is an ultraviolet curing material with a wavelength of 365nm or 405nm.

Preferably, the light-curing material is 67% SBS block copolymer by weight, 20% polybutadiene oil, 10% 1,6-hexanediol diacrylate and 3% benzil Mixed materials composed of dimethyl ketal;

Or 60% by weight SBS block copolymer, 5% SIS block copolymer, 25% polybutadiene oil, 7% 1,6-hexanediol diacrylate and 3% hexa Mixed material composed of phenylbisimidazole.

Preferably, the thickness of the convex layer in the graphic information bearing area in step 5) is 3-12mm.

A kind of production equipment of letterpress printing plate by above-mentioned method, it is characterized in that, comprise printing plate material, transfer printing equipment and drying device, described printing plate material is the CTP printing plate that has formed graphic area, and described transfer printing equipment It includes a printing plate cylinder, an ink form roller, a water form roller, a water uniform roller, a water transfer roller and a water bucket roller. The printing plate material is installed on the printing plate cylinder, and the ink form roller and the water form roller are respectively attached to the printing plate material. The dampening roller is connected to the water uniform roller, the water uniform roller is connected to the water transfer roller, and the water transfer roller is connected to the water bucket roller. The drying device is located on the side of the printing plate cylinder, and the working port of the drying device is facing the printing plate on the printing plate cylinder. , the drying device is an ultraviolet curing device with a wavelength of 405nm or 365nm.

Compared with prior art, the beneficial effect of the present invention is:

1. Using the principle of addition, the printing plate is repeatedly coated with cured material, without exposure and development, without imposition and revision, and its dot reproducibility is good, and it can directly output large format;

2. It saves the complex operation links such as film washing, plate revision and plate printing in the darkroom;

3. Utilizing the high precision of offset printing CTP plate, the high-gloss part dots are not lost;

4. The letterpress plate can easily obtain flat-top dots, the pressure control is easier and more stable during the printing process, the image stability is high, and the image transfer error is small.

Description of drawings

Fig. 1 is the structural representation of production equipment of the present invention.

Reference signs: 1-plate cylinder, 2-printing plate, 3-drying device, 4-ink form roller, 5-water application roller, 6-water uniform roller, 7-water transfer roller, 8-water bucket roller.

Detailed ways

The present invention will be further described below in combination with specific embodiments and accompanying drawings.

Embodiment one

A method for manufacturing a letterpress printing plate. The plate-making information is processed by a computer, and the existing Kodak offset printing CTP direct plate-making machine is output to obtain a printing plate 2 containing graphics and text. The technology for producing the printing plate 2 is an existing Technology, optional, CTP printing plate base is organic polymer hydrophilic plate, organic polymer-inorganic composite hydrophilic plate or aluminum plate base, but not limited to these materials, such as "Huaguang" heat-sensitive CTP printing plate . Install the printing plate material 2 on the supporting printing plate cylinder 1, after installation, attach two dampening rollers 5 to the printing plate material 2, that is, the two dampening rollers 5 are in contact with the printing plate material at a certain distance 2 on the surface. The two water application rollers 5 contact a water uniform roller 6 in the form of a circle pressing a circle, that is, the water uniform roller 6 is tangent to the two water application rollers 5 . The water uniform roller 6 contacts the water transfer roller 7, and the water transfer roller 7 contacts the bucket roller 8. The dampening solution is transferred to the dampening roller 5 through the water bucket roller 8, the water transfer roller 7 and the water equalizing roller 6 in sequence. With the rotation of the printing plate cylinder 1, the dampening roller 5 distributes the water evenly on the printing plate 2 Above, the blank part of the water layer is formed. After the dampening solution is applied to the printing plate 2, the dampening roller 5 leaves the printing plate 2, contacts the ink form roller 4 on the surface of the printing plate 2, and coats the printing plate 2 with a light-curing material, which is also two The ink form roller 4 is in contact with the surface of the printing plate 2 at a certain distance.

Curing material selects photocuring material to be to be by weight ratio be 67% SBS block copolymer (the D-1102 product of preferred U.S. Kraton polymer company), 20% polybutadiene oil, 10% diacrylic acid 1,6 -The mixed material that hexanediol ester and 3% benzil dimethyl ketal form; Perhaps the SBS block copolymer (the D-1102 product of preferred U.S. Kraton Polymer Company) of 60% by weight ratio, 5 % of SIS block copolymer (preferably the D-1161 product of Kraton polymer company in the United States), 25% of polybutadiene oil, 7% of 1,6-hexanediol diacrylate and 3% of hexaphenyl Mixed material composed of bis-imidazole.

During the process of coating the cured material, one rotation of the printing plate 2 is regarded as one transfer. After several times of transfer printing, the cured material coated on the printing plate 2 is light-cured through the drying device 3 to form a graphic information bearing area (that is, the convex layer of the graphic area of the relief image), that is, a relief printing is obtained. Version. The letterpress printing plate is baked in the baking machine according to the printing requirements, and the letterpress printing plate after baking can be printed on the machine.

The drying device 3 adopts an ultraviolet light curing device whose light source is a wavelength of 365nm or 405nm. The dots on the printing plate 2 form a rectangular flat-top shape according to the selection of the transfer curing material. or trapezoidal The flat top dots, the number of screening lines is between 60LPI-200LPI (line pair).

Using light-curing material to transfer 100 times, the thickness of the convex layer is 3mm, after curing on-line with the curing light source device (set to 405nm ultraviolet light) for 5 seconds, the dot reproduction rate on the printing plate 2 has reached 97%, which can fully realize the high quality of 150LPI printing needs.

As shown in FIG. 1 , a production equipment for producing relief printing plates by the above method includes a printing plate material 2 , a transfer equipment and a drying device 3 . The printing plate material 2 is a CTP printing plate with graphic and text areas formed. The transfer printing equipment includes a printing plate cylinder 1 , an ink form roller 4 , a water application roller 5 , a water distribution roller 6 , a water transfer roller 7 and a bucket roller 8 . The printing plate material 2 is installed on the printing plate cylinder 1, and the printing plate material 2 is respectively attached to the ink roller 4 and the dampening roller 5, and the dampening roller 5 is connected to contact the water uniform roller 6, and the water uniform roller 6 is connected to the water transfer roller 7, and the water transfer roller 7 is connected to the water transfer roller 7. The water roller 7 is connected to contact the water bucket roller 8 . The drying device 3 is located on the side of the printing plate cylinder 1, the working port of the drying device 3 faces the printing plate material 2 on the printing plate cylinder 1, and the drying device 3 is a curing light source device.

The working mode is that the printing plate material 2 is installed on the printing plate cylinder 1 and is rotated by the printing plate cylinder 1 . The water form roller 5 and the ink form roller 4 are in contact with the surface of the printing plate material 2 respectively, and are respectively the fountain solution and the transfer curing material on the printing plate material 2 . The water form roller 5 and the ink form roller 4 are respectively formed into a group with a certain distance between them and work at the same time. On the two water form rollers 5 and ink form rollers 4 , the water and cured material are transferred to the water form rollers 5 and the ink form rollers 4 in a circular pressing manner, so as to be evenly distributed on the printing plate material 2 . The water application and the coating of the cured material are separate, the water is applied first and then the cured material is coated. Finally, the drying device 3 is used to dry the cured material.

The beneficial effect of the present invention is that, adopting the principle of addition, the solidified material is repeatedly transferred on the printing plate 2, without exposure and development, without imposition and revision, and its dot reproducibility is good, and the large format can be directly output; the darkroom film is omitted Complicated operations such as rinsing, revision, printing, etc.; using the high precision of offset printing CTP plates, the dots in the highlight part are not lost; through the control of printing pressure, flat top dots can be easily obtained, so that the letterpress plate can be used in the printing process The medium pressure control is easier and more stable, the image stability is high, and the image transfer error is small; the plate base material has a wide range of choices, which can be photopolymerizable or non-photopolymerizable.

Embodiment two

A method for manufacturing a letterpress printing plate. The plate-making information is processed by a computer, and the existing Kodak offset printing CTP direct plate-making machine is output to obtain a printing plate 2 containing graphics and text. The technology for producing the printing plate 2 is an existing Technology, optional, CTP printing plate base is organic polymer hydrophilic plate, organic polymer-inorganic composite hydrophilic plate or aluminum plate base, but not limited to these materials, such as "Huaguang" heat-sensitive CTP printing plate . Install the printing plate material 2 on the supporting printing plate cylinder 1, after installation, attach two dampening rollers 5 to the printing plate material 2, that is, the two dampening rollers 5 are in contact with the printing plate material at a certain distance 2 on the surface. The two water application rollers 5 contact a water uniform roller 6 in the form of a circle pressing a circle, that is, the water uniform roller 6 is tangent to the two water application rollers 5 . The water uniform roller 6 contacts the water transfer roller 7, and the water transfer roller 7 contacts the bucket roller 8. The dampening solution is transferred to the dampening roller 5 through the water bucket roller 8, the water transfer roller 7 and the water equalizing roller 6 in sequence. With the rotation of the printing plate cylinder 1, the dampening roller 5 distributes the water evenly on the printing plate 2 Above, the blank part of the water layer is formed. After the dampening solution is applied to the printing plate 2, the dampening roller 5 leaves the printing plate 2, contacts the ink form roller 4 on the surface of the printing plate 2, and coats the printing plate 2 with a light-curing material, which is also two The ink form roller 4 is in contact with the surface of the printing plate 2 at a certain distance.

Curing material selects photocuring material to be to be by weight ratio be 67% SBS block copolymer (the D-1102 product of preferred U.S. Kraton polymer company), 20% polybutadiene oil, 10% diacrylic acid 1,6 -The mixed material that hexanediol ester and 3% benzil dimethyl ketal form; Perhaps the SBS block copolymer (the D-1102 product of preferred U.S. Kraton Polymer Company) of 60% by weight ratio, 5 % of SIS block copolymer (preferably the D-1161 product of Kraton polymer company in the United States), 25% of polybutadiene oil, 7% of 1,6-hexanediol diacrylate and 3% of hexaphenyl Mixed material composed of bis-imidazole.

During the process of coating the cured material, one rotation of the printing plate 2 is regarded as one transfer. After several times of transfer printing, the cured material coated on the printing plate 2 is light-cured through the drying device 3 to form a graphic information bearing area (that is, the convex layer of the graphic area of the relief image), that is, a relief printing is obtained. Version. The letterpress printing plate is baked in the baking machine according to the printing requirements, and the letterpress printing plate after baking can be printed on the machine.

The drying device 3 adopts an ultraviolet light curing device whose light source is a wavelength of 365nm or 405nm. The dots on the printing plate 2 form a rectangular flat-top shape according to the selection of the transfer curing material. or trapezoidal The flat top dots, the number of screening lines is between 60LPI-200LPI (line pair).

Using light-curing material to transfer 400 times, the thickness of the convex layer is 5mm, after the curing light source device (set to 365nm ultraviolet light) is cured online for 5 seconds, the dot reproduction rate on the printing plate 2 reaches 96%, which can fully realize the high quality of 120LPI printing needs.

As shown in FIG. 1 , a production equipment for producing relief printing plates by the above method includes a printing plate material 2 , a transfer equipment and a drying device 3 . The printing plate material 2 is a CTP printing plate with graphic and text areas formed. The transfer printing equipment includes a printing plate cylinder 1 , an ink form roller 4 , a water application roller 5 , a water distribution roller 6 , a water transfer roller 7 and a bucket roller 8 . The printing plate material 2 is installed on the printing plate cylinder 1, and the printing plate material 2 is respectively attached to the ink roller 4 and the dampening roller 5, and the dampening roller 5 is connected to contact the water uniform roller 6, and the water uniform roller 6 is connected to the water transfer roller 7, and the water transfer roller 7 is connected to the water transfer roller 7. The water roller 7 is connected to contact the water bucket roller 8 . The drying device 3 is located on the side of the printing plate cylinder 1, the working port of the drying device 3 faces the printing plate material 2 on the printing plate cylinder 1, and the drying device 3 is a curing light source device.

The working mode is that the printing plate material 2 is installed on the printing plate cylinder 1 and is rotated by the printing plate cylinder 1 . The water form roller 5 and the ink form roller 4 are in contact with the surface of the printing plate material 2 respectively, and are respectively the fountain solution and the transfer curing material on the printing plate material 2 . The water form roller 5 and the ink form roller 4 are respectively formed into a group with a certain distance between them and work at the same time. On the two water form rollers 5 and ink form rollers 4 , the water and cured material are transferred to the water form rollers 5 and the ink form rollers 4 in a circular pressing manner, so as to be evenly distributed on the printing plate material 2 . The water application and the coating of the cured material are separate, the water is applied first and then the cured material is coated. Finally, the drying device 3 is used to dry the cured material.

The beneficial effect of the present invention is that, adopting the principle of addition, the solidified material is repeatedly transferred on the printing plate 2, without exposure and development, without imposition and revision, and its dot reproducibility is good, and the large format can be directly output; the darkroom film is omitted Complicated operations such as rinsing, revision, printing, etc.; using the high precision of offset printing CTP plates, the dots in the highlight part are not lost; through the control of printing pressure, flat top dots can be easily obtained, so that the letterpress plate can be used in the printing process The medium pressure control is easier and more stable, the image stability is high, and the image transfer error is small; the plate base material has a wide range of choices, which can be photopolymerizable or non-photopolymerizable.

Embodiment Three

A method for manufacturing a letterpress printing plate. The plate-making information is processed by a computer, and the existing Kodak offset printing CTP direct plate-making machine is output to obtain a printing plate 2 containing graphics and text. The technology for producing the printing plate 2 is an existing Technology, optional, CTP printing plate base is organic polymer hydrophilic plate, organic polymer-inorganic composite hydrophilic plate or aluminum plate base, but not limited to these materials, such as "Huaguang" heat-sensitive CTP printing plate . Install the printing plate material 2 on the supporting printing plate cylinder 1, after installation, attach two dampening rollers 5 to the printing plate material 2, that is, the two dampening rollers 5 are in contact with the printing plate material at a certain distance 2 on the surface. The two water application rollers 5 contact a water uniform roller 6 in the form of a circle pressing a circle, that is, the water uniform roller 6 is tangent to the two water application rollers 5 . The water uniform roller 6 contacts the water transfer roller 7, and the water transfer roller 7 contacts the bucket roller 8. The dampening solution is transferred to the dampening roller 5 through the water bucket roller 8, the water transfer roller 7 and the water equalizing roller 6 in sequence. With the rotation of the printing plate cylinder 1, the dampening roller 5 distributes the water evenly on the printing plate 2 Above, the blank part of the water layer is formed. After the dampening solution is applied to the printing plate 2, the dampening roller 5 leaves the printing plate 2, contacts the ink form roller 4 on the surface of the printing plate 2, and coats the printing plate 2 with a light-curing material, which is also two The ink form roller 4 is in contact with the surface of the printing plate 2 at a certain distance.

Curing material selects photocuring material to be to be by weight ratio be 67% SBS block copolymer (the D-1102 product of preferred U.S. Kraton polymer company), 20% polybutadiene oil, 10% diacrylic acid 1,6 -The mixed material that hexanediol ester and 3% benzil dimethyl ketal form; Perhaps the SBS block copolymer (the D-1102 product of preferred U.S. Kraton Polymer Company) of 60% by weight ratio, 5 % of SIS block copolymer (preferably the D-1161 product of Kraton polymer company in the United States), 25% of polybutadiene oil, 7% of 1,6-hexanediol diacrylate and 3% of hexaphenyl Mixed material composed of bis-imidazole.

During the process of coating the cured material, one rotation of the printing plate 2 is regarded as one transfer. After several times of transfer printing, the cured material coated on the printing plate 2 is light-cured through the drying device 3 to form a graphic information bearing area (that is, the convex layer of the graphic area of the relief image), that is, a relief printing is obtained. Version. The letterpress printing plate is baked in the baking machine according to the printing requirements, and the letterpress printing plate after baking can be printed on the machine.

The drying device 3 adopts an ultraviolet light curing device whose light source is a wavelength of 365nm or 405nm. The dots on the printing plate 2 form a rectangular flat-top shape according to the selection of the transfer curing material. or trapezoidal The flat top dots, the number of screening lines is between 60LPI-200LPI (line pair).

Using light-curing material to transfer 800 times, the thickness of the convex layer is 8mm, after curing on-line with the curing light source device (set to 405nm ultraviolet light) for 5 seconds, the dot reproduction rate on the printing plate 2 has reached 95%, which can fully realize the high quality of 100LPI printing needs.

As shown in FIG. 1 , a production equipment for producing relief printing plates by the above method includes a printing plate material 2 , a transfer equipment and a drying device 3 . The printing plate material 2 is a CTP printing plate with graphic and text areas formed. The transfer printing equipment includes a printing plate cylinder 1 , an ink form roller 4 , a water application roller 5 , a water distribution roller 6 , a water transfer roller 7 and a bucket roller 8 . The printing plate material 2 is installed on the printing plate cylinder 1, and the printing plate material 2 is respectively attached to the ink roller 4 and the dampening roller 5, and the dampening roller 5 is connected to contact the water uniform roller 6, and the water uniform roller 6 is connected to the water transfer roller 7, and the water transfer roller 7 is connected to the water transfer roller 7. The water roller 7 is connected to contact the water bucket roller 8 . The drying device 3 is located on the side of the printing plate cylinder 1, the working port of the drying device 3 faces the printing plate material 2 on the printing plate cylinder 1, and the drying device 3 is a curing light source device.

The working mode is that the printing plate material 2 is installed on the printing plate cylinder 1 and is rotated by the printing plate cylinder 1 . The water form roller 5 and the ink form roller 4 are in contact with the surface of the printing plate material 2 respectively, and are respectively the fountain solution and the transfer curing material on the printing plate material 2 . The water form roller 5 and the ink form roller 4 are respectively formed into a group with a certain distance between them and work at the same time. On the two water form rollers 5 and ink form rollers 4 , the water and cured material are transferred to the water form rollers 5 and the ink form rollers 4 in a circular pressing manner, so as to be evenly distributed on the printing plate material 2 . The water application and the coating of the cured material are separate, the water is applied first and then the cured material is coated. Finally, the drying device 3 is used to dry the cured material.

The beneficial effect of the present invention is that, adopting the principle of addition, the solidified material is repeatedly transferred on the printing plate 2, without exposure and development, without imposition and revision, and its dot reproducibility is good, and the large format can be directly output; the darkroom film is omitted Complicated operations such as rinsing, revision, printing, etc.; using the high precision of offset printing CTP plates, the dots in the highlight part are not lost; through the control of printing pressure, flat top dots can be easily obtained, so that the letterpress plate can be used in the printing process The medium pressure control is easier and more stable, the image stability is high, and the image transfer error is small; the plate base material has a wide range of choices, which can be photopolymerizable or non-photopolymerizable.

Embodiment Four

A method for manufacturing a letterpress printing plate. The plate-making information is processed by a computer, and the existing Kodak offset printing CTP direct plate-making machine is output to obtain a printing plate 2 containing graphics and text. The technology for producing the printing plate 2 is an existing Technology, optional, CTP printing plate base is organic polymer hydrophilic plate, organic polymer-inorganic composite hydrophilic plate or aluminum plate base, but not limited to these materials, such as "Huaguang" heat-sensitive CTP printing plate . Install the printing plate material 2 on the supporting printing plate cylinder 1, after installation, attach two dampening rollers 5 to the printing plate material 2, that is, the two dampening rollers 5 are in contact with the printing plate material at a certain distance 2 on the surface. The two water application rollers 5 contact a water uniform roller 6 in the form of a circle pressing a circle, that is, the water uniform roller 6 is tangent to the two water application rollers 5 . The water uniform roller 6 contacts the water transfer roller 7, and the water transfer roller 7 contacts the bucket roller 8. The dampening solution is transferred to the dampening roller 5 through the water bucket roller 8, the water transfer roller 7 and the water equalizing roller 6 in sequence. With the rotation of the printing plate cylinder 1, the dampening roller 5 distributes the water evenly on the printing plate 2 Above, the blank part of the water layer is formed. After the dampening solution is applied to the printing plate 2, the dampening roller 5 leaves the printing plate 2, contacts the ink form roller 4 on the surface of the printing plate 2, and coats the printing plate 2 with a light-curing material, which is also two The ink form roller 4 is in contact with the surface of the printing plate 2 at a certain distance.

Curing material selects photocuring material to be to be by weight ratio be 67% SBS block copolymer (the D-1102 product of preferred U.S. Kraton polymer company), 20% polybutadiene oil, 10% diacrylic acid 1,6 -The mixed material that hexanediol ester and 3% benzil dimethyl ketal form; Perhaps the SBS block copolymer (the D-1102 product of preferred U.S. Kraton Polymer Company) of 60% by weight ratio, 5 % of SIS block copolymer (preferably the D-1161 product of Kraton polymer company in the United States), 25% of polybutadiene oil, 7% of 1,6-hexanediol diacrylate and 3% of hexaphenyl Mixed material composed of bis-imidazole.

During the process of coating the cured material, one rotation of the printing plate 2 is regarded as one transfer. After several times of transfer printing, the cured material coated on the printing plate 2 is light-cured through the drying device 3 to form a graphic information bearing area (that is, the convex layer of the graphic area of the relief image), that is, a relief printing is obtained. Version. The letterpress printing plate is baked in the baking machine according to the printing requirements, and the letterpress printing plate after baking can be printed on the machine.

The drying device 3 adopts an ultraviolet light curing device whose light source is a wavelength of 365nm or 405nm. The dots on the printing plate 2 form a rectangular flat-top shape according to the selection of the transfer curing material. or trapezoidal The flat top dots, the number of screening lines is between 60LPI-200LPI (line pair).

Using light-curing material to transfer 1000 times, the thickness of the convex layer is 12mm, after curing on-line with the curing light source device (set to 405nm ultraviolet light) for 5 seconds, the dot reproduction rate on the printing plate 2 has reached 93%, which can fully realize the high quality of 80LPI printing needs.

As shown in FIG. 1 , a production equipment for producing relief printing plates by the above method includes a printing plate material 2 , a transfer equipment and a drying device 3 . The printing plate material 2 is a CTP printing plate with graphic and text areas formed. The transfer printing equipment includes a printing plate cylinder 1 , an ink form roller 4 , a water application roller 5 , a water distribution roller 6 , a water transfer roller 7 and a bucket roller 8 . The printing plate material 2 is installed on the printing plate cylinder 1, and the printing plate material 2 is respectively attached to the ink roller 4 and the dampening roller 5, and the dampening roller 5 is connected to contact the water uniform roller 6, and the water uniform roller 6 is connected to the water transfer roller 7, and the water transfer roller 7 is connected to the water transfer roller 7. The water roller 7 is connected to contact the water bucket roller 8 . The drying device 3 is located on the side of the printing plate cylinder 1, the working port of the drying device 3 faces the printing plate material 2 on the printing plate cylinder 1, and the drying device 3 is a curing light source device.

The working mode is that the printing plate material 2 is installed on the printing plate cylinder 1 and is rotated by the printing plate cylinder 1 . The water form roller 5 and the ink form roller 4 are in contact with the surface of the printing plate material 2 respectively, and are respectively the fountain solution and the transfer curing material on the printing plate material 2 . The water form roller 5 and the ink form roller 4 are respectively formed into a group with a certain distance between them and work at the same time. On the two water form rollers 5 and ink form rollers 4 , the water and cured material are transferred to the water form rollers 5 and the ink form rollers 4 in a circular pressing manner, so as to be evenly distributed on the printing plate material 2 . The water application and the coating of the cured material are separate, the water is applied first and then the cured material is coated. Finally, the drying device 3 is used to dry the cured material.

The beneficial effect of the present invention is that, adopting the principle of addition, the solidified material is repeatedly transferred on the printing plate 2, without exposure and development, without imposition and revision, and its dot reproducibility is good, and the large format can be directly output; the darkroom film is omitted Complicated operations such as rinsing, revision, printing, etc.; using the high precision of offset printing CTP plates, the dots in the highlight part are not lost; through the control of printing pressure, flat top dots can be easily obtained, so that the letterpress plate can be used in the printing process The medium pressure control is easier and more stable, the image stability is high, and the image transfer error is small; the plate base material has a wide range of choices, which can be photopolymerizable or non-photopolymerizable.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. A method for manufacturing a letterpress printing plate, comprising the following steps: 1) The plate-making information is processed by a computer, and the printing plate material containing the graphic part is obtained through the existing offset printing CTP output; 2) Install the printing plate on the matching plate cylinder; 3) After installation, attach the dampening roller to the printing plate, start the printing plate cylinder, and apply dampening solution to the printing plate through the dampening roller; 4) After the dampening solution is applied, the dampening roller stops supplying the dampening solution, the ink form roller is attached to the printing plate, and the solidified material is transferred to the surface of the printing plate through the ink form roller; 5) After the cured material passes through the transfer process, a drying device is used to cure the surface of the cured material transferred on the printing plate to form a graphic information bearing area to obtain a letterpress printing plate. 2. The manufacturing method of letterpress printing plate according to claim 1, is characterized in that, in described step 3), dampening solution is passed on the dampening roller successively by bucket roller, water transfer roller and water uniform roller. 3. the manufacture method of letterpress printing plate according to claim 1 is characterized in that, described step 3) in fountain solution is the fountain solution of conventional lithography. 4. The manufacturing method of the letterpress printing plate according to claim 1, characterized in that, in the step 4), the printing plate material is rotated once as once, and the curing material is coated on the printing plate material for 100-1000 times. 5. The method for manufacturing a relief printing plate according to claim 4, characterized in that the curing material is a light curing material. 6. the manufacture method of letterpress printing plate according to claim 5 is characterized in that, described photocurable material is the SBS block copolymer that weight ratio is 67%, the polybutadiene oil of 20%, 10% A mixed material composed of 1,6-hexanediol diacrylate and 3% benzil dimethyl ketal; Or 60% by weight SBS block copolymer, 5% SIS block copolymer, 25% polybutadiene oil, 7% 1,6-hexanediol diacrylate and 3% hexa Mixed material composed of phenylbisimidazole. 7. The method for manufacturing a letterpress printing plate according to claim 1, characterized in that the thickness of the convex layer in the graphic information bearing area in the step 5) is 3-12mm. 8. A production equipment for producing a letterpress printing plate by the above method, characterized in that it comprises a printing plate material, a transfer equipment and a drying device, the printing plate material is a CTP printing plate that has formed a graphic area, and the transfer plate The printing equipment includes a printing plate cylinder, an ink form roller, a water form roller, a water uniform roller, a water transfer roller and a water bucket roller. The printing plate material is installed on the printing plate cylinder, and the ink form roller and the water form roller are respectively attached to the printing plate material. The dampening roller is connected to the water uniform roller, the water uniform roller is connected to the water transfer roller, the water transfer roller is connected to the bucket roller, the drying device is located on the side of the printing plate cylinder, and the working port of the drying device faces the printing plate on the printing plate cylinder. For the plate material, the drying device is an ultraviolet light curing device with a wavelength of 405nm or 365nm.