CN110936701B - Treatment process of flexible board for flexo printing gradual change printing - Google Patents
Treatment process of flexible board for flexo printing gradual change printing Download PDFInfo
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- CN110936701B CN110936701B CN201911392898.0A CN201911392898A CN110936701B CN 110936701 B CN110936701 B CN 110936701B CN 201911392898 A CN201911392898 A CN 201911392898A CN 110936701 B CN110936701 B CN 110936701B
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- ultraviolet lamp
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Printing Plates And Materials Therefor (AREA)
- Printing Methods (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
The invention discloses a flexible plate treatment process for flexo-printing gradual change printing, which relates to the field of printing plates and is characterized in that the base layer surface of a flexible plate is placed under a long-wave ultraviolet lamp in a plate printing machine for irradiation; according to the shape of the pattern to be printed, the relief layer of the flexible board is placed in a plate engraving machine for engraving, and the black film is removed to obtain the pattern to be printed; placing the relief layer of the flexible plate under a short-wave ultraviolet lamp of a plate copying machine for irradiation so as to harden the part of the pattern to be printed; cleaning the relief layer of the flexible plate by a plate washing machine, wherein the flexible plate is tightly attached to a plate washing roller, the plate washing roller and a non-woven fabric roller rotate relatively, a black film on the relief layer is melted at high temperature and then converted into gas to be discharged in the cleaning process, and residual resin is erased by the non-woven fabric; the flexbile plate after will clearing up is fixed, and the relief (sculpture) layer of flexbile plate is shone by long wave ultraviolet lamp, and the basal layer is shone by short wave ultraviolet lamp, makes the flexbile plate after handling more meticulous, and hard-resisting rate is higher to the pattern is fine and smooth.
Description
Technical Field
The invention relates to the field of printing plates, in particular to a flexible plate treatment process for flexo printing gradual change printing.
Background
Printed matters are common in our lives, such as payment two-dimensional codes of merchants, stickers on shampoo, stickers on shower gel and the like. The variety and the use of the printed matter are wide, the printed matter can not be formed by a printing process, the development of the printing process is not invariable so far, on the contrary, the perfection of the printing quality always accompanies the change, the change is usually the change of two forms, namely the local change; the second is a complete change. The printing process, whether it is a local or complete change, causes a more or less variable printing effect. The key link in the printing process is the production of the printing plate template, the quality of the printing plate template directly influences the substantial quality of a printed matter, and the production of the printing plate template is the stripping link of the printing plate. In the existing printing plate demolding link, because the original printing process is adopted, factors influencing a template base layer and a relief layer exist in the operation process of a plurality of machines for demolding the printing plate, so that after demolding, the subsequent printed products are different in professional aesthetics, and certain roughness exists.
The inventor believes that in the existing printing process, the setting of a machine for leading the plate to be ejected has certain imperfection, and particularly, factors such as a printing frame and a plate washer which need a light source to influence a printing plate template play a crucial role in the quality of the printing plate template, namely a flexible plate. In the operation process, the size, the supporting force and the spacing of the small mesh points have great influence on the quality of the printing plate template and the finished product formed after the printing plate is demoulded. The firmness and the wear resistance of the existing printing plate template are insufficient, the mesh points are large, the definition is large, the mesh point intervals are fuzzy, and the supporting force on the small mesh points is small, so that the definition of a transition part of a finished product is obvious, the finished product is rough and not smooth enough, moreover, the number of times of the printing plate template can be limited in the application process, namely the number of times of printing is limited, the requirement of an operator cannot be met, the cracking resistance is insufficient, the ink transfer effect is not good enough, and the like.
Disclosure of Invention
Based on the problems of fuzzy dot spacing, small supporting force and the like of the existing printing plate template, namely a flexible plate, and in order to solve the problems of fuzzy dot spacing, small supporting force and the like of the existing printing plate template, namely a flexible plate, the invention provides a flexible plate treatment process for flexo-printing gradual change printing, so that the following technical scheme is provided aiming at the problems of fuzzy dot spacing, small supporting force and the like of the existing printing plate template, namely a flexible plate:
the invention provides a flexible board treatment process for flexo printing, which comprises the following steps:
(1) back exposure: placing the base layer surface of the flexible plate under a long-wave ultraviolet lamp in a plate copying machine for irradiation, wherein the energy set by the long-wave ultraviolet lamp of the plate copying machine is 16mw/cm ^ 2-18 mw/cm ^2, the irradiation time is 55-65 s, and determining the thickness of the substrate;
(2) engraving: according to the shape of the pattern to be printed, the relief layer of the flexible board is placed in a plate engraving machine for engraving, and the black film is removed to obtain the pattern to be printed;
(3) main exposure: placing the relief layer of the flexible plate under a short-wave ultraviolet lamp of a plate copying machine for irradiation so as to harden the part of the pattern to be printed;
(4) and (3) plate washing: cleaning the relief layer of the flexible plate by a plate washing machine, wherein the flexible plate is tightly attached to a plate washing roller, the plate washing roller and a non-woven fabric roller rotate relatively, a black film on the relief layer is melted at high temperature and then converted into gas to be discharged in the cleaning process, and residual resin is erased by the non-woven fabric;
(5) removing viscosity: and (4) fixing the flexible board cleaned in the step (4), wherein the relief layer of the flexible board is irradiated by a long-wave ultraviolet lamp, and the basal layer is irradiated by a short-wave ultraviolet lamp.
Further, in the step (1), the energy set by a long-wave ultraviolet lamp of the plate copying machine is 16mw/cm ^2, and the irradiation time is 55 s.
Further, in the step (3), the energy set by the short wave ultraviolet lamp of the plate copying machine is 17mw/cm2~20mw/cm2The irradiation time is 3.5min to 6.5 min.
Further, in the step (4), the temperature of the plate washing machine during plate washing is set to be 300-310 ℃, the pressure acting on the flexible plate is 5.5-6.5 kg, and the cleaning times are set to be 9-11 times.
Further, in the step (4), the plate washer includes a plate washer roller and a nonwoven fabric roller, and the flexible plate is wound and fixed between the plate washer roller and the nonwoven fabric roller for cleaning.
Further, in the step (5), the power of the ultraviolet lamp is set to 17mw/cm2~20mw/cm2The illumination time of the long-wave ultraviolet lamp is 5.5 min-7 min, and the illumination time of the short-wave ultraviolet lamp is 2.5 min-4 min.
Further, in the step (5), residues are left on the to-be-printed patterns of the cleaned flexible board, the cleaned flexible board is placed between a long-wave ultraviolet lamp and a short-wave ultraviolet lamp for irradiation, the relief layer of the flexible board is placed under the long-wave ultraviolet lamp, and the base layer is placed under the short-wave ultraviolet lamp.
Further, in the step (5), a conventional lotion and a non-woven fabric are arranged in the plate washing machine, and the non-woven fabric automatically and relatively wipes and cleans the engraved flexible plate under the action of the conventional lotion.
In one embodiment, in the step (3), the energy set by the short wave ultraviolet lamp of the plate copying machine is 17mw/cm ^2 to 20mw/cm ^2, and the irradiation time is 3.5min to 6.5 min; in the step (4), the plate washing machine comprises a plate washing roller and a non-woven fabric roller, the flexible plate is wound and fixed between the plate washing roller and the non-woven fabric roller, the plate washing temperature of the plate washing machine is set to be 300-310 ℃, the pressure acting on the flexible plate is 5.5-6.5 kg, and the cleaning frequency is set to be 9-11 times; in the step (5), the energy of the ultraviolet lamp is set to be 17mw/cm ^ 2-20 mw/cm ^2, the illumination time of the long-wave ultraviolet lamp is 5.5 min-7 min, the illumination time of the short-wave ultraviolet lamp is 2.5 min-4 min, the flexible plate is placed between the short-wave ultraviolet lamp and the long-wave ultraviolet lamp, the relief layer of the cleaned flexible plate is placed under the irradiation of the long-wave ultraviolet lamp, and the base layer is placed under the irradiation of the short-wave ultraviolet lamp.
The invention aims to provide a flexible board treatment process for flexo-printing gradual change printing, which is used for supporting small dots of a flexible board powerfully by changing the treatment mode in different links, so that the overall firmness of the flexible board is higher.
Another object of the present invention is to provide a flexible board processing process for flexo printing, which makes the small dots of the flexible board harder and clearer, and has higher hardness tolerance.
Another object of the present invention is to provide a flexible board processing process for flexo printing, which makes the gaps between the small dots of the flexible board clearer and smaller, and makes the smoothness higher after the subsequent finished product.
Another object of the present invention is to provide a process for treating a flexible board for flexo printing, which enables the flexible board to have better anti-cracking performance and improve the ink transfer effect.
Another object of the present invention is to provide a flexible board processing process for flexo printing, which enables the dots of the flexible board to be small, the definition to be small, and the number of times of printing to be improved.
Another objective of the present invention is to provide a flexible board processing process for flexo printing, in which the parameters are changed, so that the quality of the flexible board is greatly improved, the flexible board is finer, the hard rate is higher, the usability is stronger, the flexible board is more durable, and the pattern is vivid, fine and smooth.
The invention also aims to provide a flexible board treatment process for flexo-printing gradual change printing, wherein after the flexible board is treated by the flexible board treatment process for flexo-printing gradual change printing, a finished product obtained by a subsequent treatment link is more naturally and smoothly changed.
Drawings
FIG. 1 is a schematic view of the internal structure of a plate washer in the plate washing step of the flexographic plate treatment process for flexographic printing according to the present invention.
In the figure: a non-woven fabric roller-A.
Detailed Description
The invention is further described below with reference to fig. 1 and the detailed description.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
The invention provides a flexible board treatment process for flexo printing, which comprises the following steps:
(1) back exposure: placing the base layer surface of the flexible plate under a long-wave ultraviolet lamp in a plate copying machine for irradiation, wherein the energy set by the long-wave ultraviolet lamp of the plate copying machine is 16mw/cm ^ 2-18 mw/cm ^2, the irradiation time is 55-65 s, and determining the thickness of the substrate; the link of determining the thickness of the base in the step is a basic link of the whole flexible plate processing technology, when the plate copying machine works, the setting of the illumination time and the setting of the energy of the flexible plate all need to accord with the thickness of the base preset by an operator, when the flexible plate is penetrated, the flexible plate cannot be completely penetrated, if the flexible plate is completely penetrated, the flexible plate cannot be subjected to subsequent operation, and the flexible plate becomes waste products of the first link. It is noted that the base layer surface is a non-drug mold surface, the flexible plate is exposed to the middle layer, the non-drug mold surface is a hard surface, the drug mold surface is still a soft surface, the drug mold surface is an embossment surface described below, the thickness of the predetermined substrate is 1.14mm, and the actual back exposure penetrates 1/2 with the thickness smaller than the predetermined thickness. The operation of back exposure is powerful to the support of little dot for its firmness promotes.
(2) Engraving: according to the shape of the pattern to be printed, the relief surface of the flexible plate is placed in a engraving machine for engraving, and the black film is removed to obtain the pattern to be printed; specifically, the engraving machine engraves the relief surface of the flexible plate, and the engraved portion is transparent, thereby displaying the engraved portion, and the engraved portion, i.e., the portion to be printed, is still soft.
(3) Main exposure: placing the relief layer of the flexible plate under a short-wave ultraviolet lamp of a plate copying machine for irradiation, so that the part of the pattern to be printed, namely the engraved part, is hardened; it is noted that here the short wavelength ultraviolet light is UVC, and the long wavelength ultraviolet light is UVA. The main exposure operation ensures that small dots of the flexible board are harder and clearer, the hard resistance rate is improved, the printing service life is longer, and the printing smoothing effect is more prominent.
(4) And (3) plate washing: cleaning the relief layer of the flexible plate by a plate washing machine, wherein the flexible plate is tightly attached to a plate washing roller which rotates relative to the non-woven fabric roller A, a black film on the relief layer is melted at high temperature and then converted into gas to be discharged in the cleaning process, and the residual resin is erased by the non-woven fabric;
(5) removing viscosity: and (4) fixing the flexible board cleaned in the step (4), wherein the relief layer of the flexible board is irradiated by a long-wave ultraviolet lamp, and the basal layer is irradiated by a short-wave ultraviolet lamp.
Further, in the step (1), the energy set by the long wave ultraviolet lamp of the plate copying machine is 16mw/cm ^2, and the irradiation time is 55s, compared with the prior art, the energy and the irradiation time are set, so that the small mesh points have certain support degree, the support degree is higher, and the firmness of the small mesh points is favorably improved.
Further, in the step (3), the energy set by the short wave ultraviolet lamp of the plate copying machine is 17mw/cm2~20mw/cm2The irradiation time is 3.5min to 6.5 min. The change of the main exposure parameters ensures that small dots of the flexible board are harder and clearer, the hardness resistance rate is improved, the printing service life is longer, and the printing smoothing effect is more prominent.
Further, in the step (4), the temperature of the plate washing machine during plate washing is set to be 300-310 ℃, the pressure acting on the flexible plate is 5.5-6.5 kg, and the cleaning times are set to be 9-11 times. The change of the parameters makes the plate washing machine wash the plate more forcefully and more effectively, and is convenient for melting the black resin and converting the black resin into gas. The step enables the small dots of the flexible board to be clearer and smoother.
Further, in the step (4), the plate washer includes a plate washer roller and a nonwoven fabric roller a, and the flexible plate is wound and fixed between the plate washer roller and the nonwoven fabric roller a for cleaning. The arrangement of the non-woven fabric roller A ensures that the surface of the flexible board is smooth and uniform, and the flatness of the flexible board is ensured. It is worth mentioning that the flexible plate is attached and fixed between the plate washing roller and the non-woven fabric roller A in a winding direction, so that the flatness is convenient to ensure.
Further, in the step (5), the ultraviolet lampThe energy of (a) is set to 17mw/cm2~20mw/cm2The illumination time of the long-wave ultraviolet lamp is 5.5 min-7 min, and the illumination time of the short-wave ultraviolet lamp is 2.5 min-4 min.
Further, in the step (5), residues are left on the to-be-printed patterns of the cleaned flexible board, the cleaned flexible board is placed between a long-wave ultraviolet lamp and a short-wave ultraviolet lamp for irradiation, the relief layer of the flexible board is placed under the long-wave ultraviolet lamp, and the base layer is placed under the short-wave ultraviolet lamp. It is worth mentioning that after the tack is removed, the anti-cracking property and the wear resistance are improved, and the ink transfer effect is improved.
Further, in the step (5), the plate washing machine is internally provided with conventional lotion and non-woven fabric, and the non-woven fabric automatically and relatively wipes and cleans the engraved flexible plate under the action of the conventional lotion, so that the black resin of the flexible plate can be completely cleaned.
On the whole, the invention has obvious effect, the flexible plate is more refined after being processed, the hard rate is higher, the pattern is vivid, fine and smooth, and no fracture exists in gradual change.
It is to be noted that the structures of the plate printing machine and the plate engraving machine are the prior art, the plate washing machine added with the press roll is to add the nonwoven fabric roll a below the plate washing roll on the basis of the original plate washing machine, and the plate washing machine in the figure is the plate washing machine of patent No. 201420334772.4 in which the nonwoven fabric roll a is added in one embodiment, but is not limited to the plate washing machine.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and the embodiments of the present invention may be modified or adapted in any manner.
It can thus be seen that the objects of the invention are sufficiently well-attained. The embodiment illustrated and described herein is to be considered as illustrative of the functional and structural principles of the present invention and changes may be made without departing from such principles. Accordingly, this invention includes all modifications encompassed within the scope and spirit of the following claims.
Claims (1)
1. A flexible board treatment process for flexo printing and gradient printing is characterized by comprising the following steps:
step (1), back exposure: placing the base layer surface of the flexible plate under a long-wave ultraviolet lamp in a plate copying machine for irradiation, wherein the energy set by the long-wave ultraviolet lamp of the plate copying machine is 16mw/cm2Determining the thickness of the substrate with the irradiation time of 55s, wherein the thickness of the substrate is 1.14mm, and the actual back exposure penetrates 1/2 the thickness of which is smaller than the preset thickness of the substrate;
step (2) engraving: according to the shape of the pattern to be printed, the relief layer of the flexible board is placed in a plate engraving machine for engraving, and the black film is removed to obtain the pattern to be printed;
step (3), main exposure: placing the relief layer of the flexible plate under a short wave ultraviolet lamp of a plate copying machine for irradiation to harden the part of the pattern to be printed, wherein the energy set by the short wave ultraviolet lamp of the plate copying machine is 17mw/cm2~20mw/cm2The irradiation time is 3.5 min-6.5 min, the short wave ultraviolet ray is UVC, and the long wave ultraviolet ray is UVA;
and (4) plate washing: the relief layer of the flexible plate is cleaned through a plate washer, the plate washer comprises a plate washer roller and a non-woven fabric roller (A), the flexible plate is fixed between the plate washer roller and the non-woven fabric roller (A) in a winding direction and is tightly attached to the plate washer roller, the plate washer roller and the non-woven fabric roller (A) rotate relatively, in the cleaning process, a black film on the relief layer is melted at high temperature and then converted into gas to be discharged, residual resin is erased through the non-woven fabric, the plate washer is set to be at the temperature of 300-310 ℃, the pressure acting on the flexible plate is 5.5-6.5 kilograms, and the cleaning frequency is set to be 9-11 times; the plate washing machine comprises a plate washing roller and a non-woven fabric roller (A), and the flexible plate is fixed between the plate washing roller and the non-woven fabric roller (A) in a winding direction for washing;
removing the viscosity: fixing the flexible board cleaned in the step (4), wherein the relief layer of the flexible board is irradiated by a long-wave ultraviolet lamp, the basal layer is irradiated by a short-wave ultraviolet lamp, and the energy of the ultraviolet lamp is set to be 17mw/cm2~20mw/cm2The long-wave ultraviolet lamp is characterized in that the illumination time of the long-wave ultraviolet lamp is 5.5-7 min, the illumination time of the short-wave ultraviolet lamp is 2.5-4 min, residues are left on the to-be-printed patterns of the cleaned flexible board, the cleaned flexible board is placed between the long-wave ultraviolet lamp and the short-wave ultraviolet lamp to be irradiated, the embossment layer of the flexible board is placed under the long-wave ultraviolet lamp, and the base layer is placed under the short-wave ultraviolet lamp.
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| CN201911392898.0A CN110936701B (en) | 2019-12-30 | 2019-12-30 | Treatment process of flexible board for flexo printing gradual change printing |
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