CN111361319A - Transfer paperboard intaglio printing process - Google Patents
Transfer paperboard intaglio printing process Download PDFInfo
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- CN111361319A CN111361319A CN202010274079.2A CN202010274079A CN111361319A CN 111361319 A CN111361319 A CN 111361319A CN 202010274079 A CN202010274079 A CN 202010274079A CN 111361319 A CN111361319 A CN 111361319A
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- printing
- varnish
- transfer
- paper
- paperboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/10—Intaglio printing ; Gravure printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/002—Sheet printing presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
- B41M5/0017—Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
Abstract
The invention discloses a transfer paperboard intaglio printing process, which comprises the following steps: the first step, printing varnish on a unit type gravure press by using a reel transfer paperboard as a printing stock; secondly, printing other color sequence pictures and texts, wherein the arrangement of the printing color sequence can be carried out according to the specific product requirements; and thirdly, carrying out line connection concave-convex processing, cutting by a transverse cutting machine to obtain a single paper printed matter, and turning to the next procedure. In the process, printing varnish is added on the transfer paperboard and is carried out before printing the image-text color ink, the varnish is colorless, the effect of the varnish is to lay a bottom before formally printing the image-text, the tension of the reel transfer paperboard can be stabilized through the printing varnish, the problem that the surface of the transfer paperboard is unsmooth is solved, the adhesive force of the surface of the transfer paperboard to an ink layer is increased, the problem that the bottom color is not really printed is solved, and the printing ink layer after laying the bottom is finer and brighter.
Description
Technical Field
The invention relates to a printing technology, in particular to a transfer paperboard intaglio printing process.
Background
The transfer paper is widely applied to various high-grade packages as the current novel environment-friendly paper, and the following problems are easily generated in the intaglio printing process:
firstly, the transfer film or the compound glue causes the surface of paper to be unsmooth, the transfer layer has poor adaptability, and the printing tension is not stably controlled, so that the fault of inaccurate overprint is caused.
And secondly, the quality problems of products such as poor printing ground color, thin ink layer and the like are caused by uneven transfer base film, thin transfer layer, poor coating leveling on the surface of transfer base paper or uneven surface of transfer base paper.
The above two problems increase the rejection rate.
To address the above problems, printing manufacturers currently address this by:
firstly, carry out raw and other materials customer and complain the feedback, require paper supplier to change and shift the base film, change the backing paper of high quality and reach the purpose that improves the promotion.
And secondly, the transfer paper is stored in advance, the comfort and balance storage is carried out for 3-6 months in a warehouse of a printing manufacturer, and the tension of the transfer paper is improved to a certain extent after the transfer paper with the comfort and balance storage is printed on a machine.
Thirdly, the printing ink is re-prepared, and the ink with finer particles is selected to increase the ductility of the printing ink layer.
For the first solution, on the premise of short delivery cycle, the improvement of suppliers is often relatively delayed, and the supply of raw materials cannot be guaranteed in time, which results in product delivery delay, thereby affecting market traffic and enterprise credibility.
With the second solution, since the surface properties of the transfer film are not improved, the leveling of the printing ink layer is poor, and the ground color is not solid.
For the third solution, because the leveling property of the gravure water-based ink used at present is generally poor, the water-based ink with the changed particle fineness can not meet the product quality requirement, and the problem of unreal ground color can be solved by using the solvent-based ink with fine particles, but the risk of overproof solvent residue exists.
In addition to the above problems, the embossing process in the post-press processing procedure is mostly performed in an off-line way of sheet-fed flat pressing or a connection way of a single round pressing unit.
The off-line mode production efficiency of platen press is low, and unsmooth pressure is inhomogeneous, and off-line processing need reserve on the sheet-fed and hold the mouth and drag the part of taking along, is a cost waste to the higher transfer paper of price, and because off-line processing technology route is longer, production cycle is long, and paper water content changes easily to cause the harmomegathus phenomenon, appears the chromatography inaccurate, and is extravagant great.
The connection mode of the single round pressing unit is a vertical upper and lower round roller structure, the connection processing precision is good, but the unit is too large, the purchase price is high, the maintenance cost is high, the maintenance is not convenient, and the purchase period is relatively long.
Disclosure of Invention
The invention aims to provide a transfer paperboard intaglio printing process, which solves the problems of unstable tension and unrealistic ground color printing in the transfer paperboard intaglio printing process.
In order to solve the technical problems, the invention adopts the following technical means:
a transfer paperboard intaglio printing process comprises the following steps:
the first step, printing varnish on a unit type gravure press by using a reel transfer paperboard as a printing stock;
secondly, printing other color sequence images and texts, wherein the arrangement of the printing color sequence can be carried out according to specific product requirements, for example, the color sequence is white, transparent yellow, transparent red, golden ground color, character gold, tawny color, black and gloss oil by taking the Nanjing tobacco label packaging paper as an example;
and thirdly, carrying out line connection concave-convex processing, cutting by a transverse cutting machine to obtain a single paper printed matter, and turning to the next procedure.
The existing transfer paper gravure printing does not adopt a varnish bottoming printing process, namely, the existing printing process route does not have the varnish bottoming process, so that varnish printing is added on the basis of the existing process, and the production cost is greatly increased due to the addition of working procedures.
In the process, printing varnish is added on the transfer paperboard and is carried out before printing the image-text color ink, the varnish is colorless, the effect of the varnish is to lay a bottom before formally printing the image-text, the tension of the reel transfer paperboard can be stabilized through the printing varnish, the problem that the surface of the transfer paperboard is unsmooth is solved, the adhesive force of the surface of the transfer paperboard to an ink layer is increased, the problem that the bottom color is not really printed is solved, and the printing ink layer after laying the bottom is finer and brighter.
The further preferred technical scheme is as follows:
the first step of the transfer paperboard gravure printing process is to print varnish on a unit type gravure press, wherein the printing varnish formula comprises: acrylic acid modified polyester resin
Water-based modified acrylic resin
Defoaming agent
Wetting and dispersing agent
Anhydrous alcohol
Purified water
At present, most of varnish printing processes of printing manufacturers are used on coated paper or white cardboard with uneven surfaces, and are basically not used on transfer paper. When the varnish in the prior art is used for the transfer paperboard in the process, the problems of overlarge surface tension, poor leveling property and poor adhesive force appear in the using process, and an ink layer is easy to fall off after being dried.
In addition, most of the existing water-based varnish technologies use styrene-acrylic acid copolymers, and when the concentration reaches a certain value, the water-based varnish has stimulation and anesthesia effects on a human body, so that the water-based varnish has the risk of occupational hazards. The varnish of the technical scheme has no risk.
The first step of the transfer paperboard gravure printing process is to print varnish on a unit type gravure press, wherein the printing varnish formula comprises: 60 parts of acrylic acid modified polyester resin; a water-based modified acrylic resin 35; 0.1 part of defoaming agent; 0.1 part of wetting dispersant; 1.8 parts of anhydrous alcohol; 3 parts of purified water.
The transfer paperboard gravure printing process is characterized in that the varnish is prepared by the following steps of firstly, thoroughly cleaning a stirrer by using alcohol, pouring acrylic acid modified polyester resin, water-based modified acrylic resin, a defoaming agent and a wetting dispersant into the stirrer, and dispersing for 30 minutes at the speed of 1000 revolutions per minute to obtain a mixed solution 1; mixing purified water and anhydrous alcohol in proportion and uniformly mixing to obtain a mixed solution 2; and pouring the mixed solution 2 into the mixed solution 1, and dispersing for 10 minutes at the speed of 1000 rpm to obtain the varnish. The viscosity of varnish in printing is 10-12s for tea-en 2 cup, and the varnish is dried by steam, wherein the temperature of an oven is 40-50 ℃.
The varnish of the invention is found in preparation and use that the increase of stirring dispersion time and the reduction of varnish viscosity have good effects on reducing surface tension and improving leveling, and the varnish prepared by the method has ideal effects.
In the formula of the printing varnish, the acrylic modified polyester resin has the model of PJ29-75, (4-12) s/Grignard tube at 25 ℃, and the manufacturer is Jiangmen paint manufacturing company Limited. The waterborne modified acrylic resin has the model of PJ6905-70 and the model of (200-. The model of the defoaming agent is BYK1660, and the manufacturer is Shanghai vertical chemical engineering Co. The wetting dispersant is BYK1148, and the manufacturer is Shanghai Ringcheng chemical engineering Co.
The transfer paperboard intaglio printing process comprises a first step of printing images and texts in other color sequences, a second step of printing images and texts in other color sequences, printing water-based white ink on one side of the overprint detection mark to lay a bottom, and adjusting the center of a cursor probe to be aligned with the center of the overprint mark color code block, wherein the distance between the cursor probe and the surface of the transfer paper is about 6-8mm, and the included angle formed by the cursor probe and the transfer paper is within the range of 5-10 degrees.
Image-text printing, water-based intaglio of each color is obtained by intaglio manufacturing, intaglio manufacturing manufacturers are Qingdao Yuancheng Makeup plate-making limited companies, printing color sequences are white, transparent yellow, transparent red, golden ground color, character gold, dark color, and gloss oil in sequence, the printing speed is 160m/min, the ink viscosity is 16-18s for tean 2# cup, steam drying is performed, the oven temperature is 55-70 ℃, summary is performed through groping, control parameters are optimized on the basis of the standard of GB/T7707-2008 intaglio decoration prints, QB/T3007-2008 intaglio paper base decoration prints, parameters are added tightly, in the experimental process, the phenomenon of attenuation is found through laboratory data detection, the same position of the same product just finished and placed for a period of time has the phenomenon of chromatic aberration, namely, the three values of △ l, △ a and △ b are all reduced along with the increase of the placing time, the risk of increasing is caused by the chromatic aberration, therefore, the batch parameter control requirement of △ E for adjusting the chromatic aberration parameters, the chromatic aberration is 1.0, the cursor transfer of the paper is greater than 2 l, the cursor transfer of the optical mark of the paper is greater than 0.1 mm, the optical mark of the optical mark.
Since the varnish is colorless and the overprint mark color block is colorless, when the varnish is selected as the overprint reference color, the cursor probe retrieval difficulty of the subsequent printing ink color is increased, the signal is unstable and easy to lose, and the overprint is inaccurate. For such problems, we have achieved stable overprint problems during the test by selecting the second color as the overprint reference color and the varnish checking the second color overprint back.
The transfer card paper intaglio printing process, the third step, carry out the unsmooth processing of line and utilize idle gravure press unit printing unit to reform transform and form and do not influence the printing function of original unit, remove original gravure ink groove and scraper device, replace into the simple and easy unsmooth unit that the product pattern according to this technology required and processed, simple and easy unsmooth unit is equipped with base, protruding pressure cylinder, concave pressure cylinder, pass the paper roll, transmission gear box, pneumatics closes and presses the module and control the meshing gear to constitute, pass the paper roll and carry the paper, be equipped with concave-convex module on protruding pressure cylinder 1 and the concave pressure cylinder respectively, during operation, through the pneumatic operation that closes the module, make protruding pressure cylinder and concave pressure cylinder mesh.
Utilize existing equipment transformation to print, unsmooth unit reduces an solitary unsmooth manufacturing procedure, has that production efficiency is high, the overprinting precision is high, unsmooth processing third dimension is strong, the operation is stable, life cycle is long, the waste of paper is low, the energy consumption is low, characteristics such as small in noise. In 2019, in 9 months, 45 ten thousand Nanjing cigarette standard strip packaging paper products are respectively produced for testing, the unit price of the products is 0.75 yuan/piece, and 631.31 yuan is saved compared with the original process.
Drawings
Fig. 1 is a third step paper feed route in the transfer jam gravure process of the present invention.
Fig. 2 is a plan view of the simple concave-convex unit of the present invention.
FIG. 3 is a schematic representation of overprinted indicia according to the present invention.
FIG. 4 is a schematic diagram of the cursor probe and paper transport of the present invention.
Description of reference numerals: 1-embossing a roller; 2-paper transfer roller; 3-paper transfer roller; 4-paper transfer roller; 5-paper conveying roller; 6-concave pressing roller; 7-paper transfer roll; 8-a transmission gearbox; 9-a pneumatic pressing module; 10-left and right meshed gears; 11-sheet-fed printed matter; 12-a text part; 13-white ink stick; 14-overprint mark. 15-cursor probe.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1, 2, 3 and 4, a transfer paperboard intaglio printing process of the present invention includes the following steps:
the first step, printing varnish on a unit type gravure press by using a reel transfer paperboard as a printing stock;
and secondly, printing other color sequence pictures and texts, wherein the arrangement of the printing color sequence can be carried out according to the specific product requirements. For example, in the case of printing color sequence arrangement on Nanjing cigarette label strip wrapping paper, the color sequence is white, transparent yellow, transparent red, golden ground color, lettered gold, dark brown, black and gloss oil;
and thirdly, carrying out line connection concave-convex processing, cutting by a transverse cutting machine to obtain a single paper printed matter, and turning to the next procedure.
In the process, printing varnish is added on the transfer paperboard and is carried out before printing the image-text color ink, the varnish is colorless, the effect of the varnish is to lay a bottom before formally printing the image-text, the tension of the reel transfer paperboard can be stabilized through the printing varnish, the problem that the surface of the transfer paperboard is unsmooth is solved, the adhesive force of the surface of the transfer paperboard to an ink layer is increased, the problem that the bottom color is not really printed is solved, and the printing ink layer after laying the bottom is finer and brighter.
The transfer paperboard gravure printing process comprises a first step of printing varnish on a unit type gravure press, wherein the printing varnish formula comprises the following components: acrylic acid modified polyester resin
Water-based modified acrylic resin
Defoaming agent
Wetting and dispersing agent
Anhydrous alcohol
Purified water
At present, most of varnish printing processes of printing manufacturers are used on coated paper or white cardboard with uneven surfaces, and are basically not used on transfer paper. When the varnish in the prior art is used for the transfer paperboard in the process, adverse reactions such as intermiscibility, reverse adhesion, color biting and the like can be generated in subsequent processing, and the printing quality can be influenced to a certain extent. In order to solve the problems of adverse reactions such as intermiscibility, reverse adhesion, color biting and the like, the water-based varnish of the technical scheme needs to be developed. The varnish is matched with gravure water-based ink through multiple blending experiments, and has no adverse reactions such as intermiscibility, reverse adhesion, color biting and the like in subsequent processing.
The transfer paperboard gravure printing process comprises a first step of printing varnish on a unit type gravure press, wherein the printing varnish formula comprises the following components: 60 parts of acrylic acid modified polyester resin; a water-based modified acrylic resin 35; 0.1 part of defoaming agent; 0.1 part of wetting dispersant; 1.8 parts of anhydrous alcohol; 3 parts of purified water.
The transfer paperboard gravure printing process is characterized in that the varnish is prepared by the following steps of firstly, thoroughly cleaning a stirrer by using alcohol, pouring acrylic acid modified polyester resin, water-based modified acrylic resin, a defoaming agent and a wetting dispersant into the stirrer, and dispersing for 30 minutes at the speed of 1000 revolutions per minute to obtain a mixed solution 1; mixing purified water and anhydrous alcohol in proportion and uniformly mixing to obtain a mixed solution 2; and pouring the mixed solution 2 into the mixed solution 1, and dispersing for 10 minutes at the speed of 1000 rpm to obtain the varnish. The viscosity of varnish in printing is 10-12s for tea-en 2 cup, and the varnish is dried by steam, wherein the temperature of an oven is 40-50 ℃.
In the formula of the printing varnish, the acrylic modified polyester resin has the model of PJ29-75, (4-12) s/Grignard tube at 25 ℃, and the manufacturer is Jiangmen paint manufacturing company Limited. The waterborne modified acrylic resin has the model of PJ6905-70 and the model of (200-. The model of the defoaming agent is BYK1660, and the manufacturer is Shanghai vertical chemical engineering Co. The wetting dispersant is BYK1148, and the manufacturer is Shanghai Ringcheng chemical engineering Co.
The transfer paperboard intaglio printing process comprises a first step of printing images and texts in other color sequences, a second step of printing images and texts in other color sequences, printing water-based white ink on one side of the overprint detection mark to lay a bottom, and adjusting the center of a cursor probe to be aligned with the center of the overprint mark color code block, wherein the distance between the cursor probe and the surface of the transfer paper is about 6-8mm, and the included angle formed by the cursor probe and the transfer paper is within the range of 5-10 degrees.
Printing other color sequence images and texts, obtaining water-based intaglio of each color by intaglio manufacturing, wherein the intaglio manufacturing manufacturer is Qingdao Yuancheng Maocheng plate-making limited company, the printing color sequence is white, transparent yellow, transparent red, golden ground color, lettering, dark, glazing oil in sequence, the printing speed is 160m/min, the ink viscosity is 16-18s for tean 2# cup, steam drying is carried out, the oven temperature is 55-70 ℃, through groping summary, the control parameter optimization is carried out on the standard basis of GB/T7707-2008 intaglio decorative printed matter, QB/T3007-2008 intaglio paper base decorative printed matter, the parameter tightening is carried out, in the experimental process, the same position color difference of the same product just finished and placed for a period of time is found to have attenuation phenomenon through laboratory data detection, namely, the same position color difference along with the placing time is increased, △ l, △ a and △ b are all reduced, the batch risk of the batch adjustment of the batch of the paper is caused by the increase of the color difference control requirement of the control parameter, the control of the color difference of the printing is greater than 1, the cursor transfer of the paper surface color difference of the paper is greater than 0.0, the cursor transfer of the paper, the transfer of the paper is greatly reduced by the index of the index mark, the index of the paper, the index of the paper is greatly reduced by the index of index.
The transfer card paper intaglio printing process, the third step, carry out the unsmooth processing of line and utilize idle gravure press unit printing unit to reform transform and form and do not influence the printing function of original unit, remove original gravure ink groove and scraper device, replace into the simple and easy unsmooth unit that the product pattern according to this technology required and processed, simple and easy unsmooth unit is equipped with base, protruding pressure cylinder, concave pressure cylinder, pass the paper roll, transmission gear box, pneumatics closes and presses the module and control the meshing gear to constitute, pass the paper roll and carry the paper, be equipped with concave-convex module on protruding pressure cylinder 1 and the concave pressure cylinder respectively, during operation, through the pneumatic operation that closes the module, make protruding pressure cylinder and concave pressure cylinder mesh.
Utilize existing equipment transformation to print, unsmooth unit reduces an solitary unsmooth manufacturing procedure, has that production efficiency is high, the overprinting precision is high, unsmooth processing third dimension is strong, the operation is stable, life cycle is long, the waste of paper is low, the energy consumption is low, characteristics such as small in noise. In 2019, in 9 months, 45 ten thousand Nanjing cigarette standard strip packaging paper products are respectively produced for testing, the unit price of the products is 0.75 yuan per piece, compared with the consumption of concave-convex processing procedures, the online processing is saved by 631.31 yuan compared with the offline processing.
Table 1: comparison table for material consumption and energy consumption of connecting concave-convex unit and offline processing
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (6)
1. A transfer paperboard intaglio printing process is characterized by comprising the following steps:
the first step, printing varnish on a unit type gravure press by using a reel transfer paperboard as a printing stock;
secondly, printing other color sequence pictures and texts;
and thirdly, carrying out line connection concave-convex processing, cutting by a transverse cutting machine to obtain a single paper printed matter, and turning to the next procedure.
2. The transfer paperboard gravure printing process of claim 1, wherein: the first step is to print varnish on a unit type gravure press, wherein the printing varnish formula comprises the following components: acrylic acid modified polyester resin
Preparing; water-based modified acrylic resin
Preparing; defoaming agent
Preparing; wetting and dispersing agent
Preparing; anhydrous alcohol
Preparing; purified water
And (4) portions are obtained.
3. The transfer paperboard gravure printing process of claim 2, wherein: the first step is to print varnish on a unit type gravure press, wherein the printing varnish formula comprises the following components: 60 parts of acrylic acid modified polyester resin; a water-based modified acrylic resin 35; 0.1 part of defoaming agent; 0.1 part of wetting dispersant; 1.8 parts of anhydrous alcohol; 3 parts of purified water.
4. A transfer paperboard intaglio printing process according to claim 2 or 3 characterized in that: the varnish is prepared by the following steps of firstly thoroughly cleaning a stirrer by using alcohol, pouring acrylic acid modified polyester resin, water-based modified acrylic resin, a defoaming agent and a wetting dispersant into the stirrer, and dispersing for 30 minutes at the speed of 1000 revolutions per minute to obtain a mixed solution 1; mixing purified water and anhydrous alcohol in proportion and uniformly mixing to obtain a mixed solution 2; and pouring the mixed solution 2 into the mixed solution 1, and dispersing for 10 minutes at the speed of 1000 rpm to obtain the varnish. The viscosity of varnish in printing is 10-12s for tea-en 2 cup, and the varnish is dried by steam, wherein the temperature of an oven is 40-50 ℃.
5. The transfer paperboard gravure printing process of claim 1, wherein: and in the second step, printing other color sequence pictures and texts, printing water-based white ink on one side of the overprint detection mark to lay a base, reducing the light reflection effect of the transfer paper, simultaneously adjusting the center of a cursor probe to be aligned with the center of the overprint mark color code block, wherein the distance between the cursor probe and the surface of the transfer paper is about 6-8mm, and the included angle between the cursor probe and the transfer paper is within the range of 5-10 degrees.
6. The transfer paperboard gravure printing process of claim 1, wherein: and the third step, the connection line concave-convex processing is carried out by utilizing the idle printing unit of the gravure printing unit to be transformed into a simple concave-convex unit which is processed according to the product pattern requirement of the process, the simple concave-convex unit is provided with a base, a convex pressing roller, a concave pressing roller, a paper conveying roller, a transmission gear box, a pneumatic pressing module and a left and right meshing gear, the paper conveying roller conveys paper, the convex pressing roller and the concave pressing roller are respectively provided with the concave-convex module, and during work, the convex pressing roller and the concave pressing roller are meshed through the pneumatic pressing module.
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| CN202010274079.2A CN111361319A (en) | 2020-04-09 | 2020-04-09 | Transfer paperboard intaglio printing process |
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Cited By (1)
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| CN112537135A (en) * | 2020-12-23 | 2021-03-23 | 陕西金叶印务有限公司 | Improved gravure press registration method |
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| EP2411227A1 (en) * | 2009-03-24 | 2012-02-01 | Hülsta-Werke Hüls GmbH & CO. KG | Method for producing panels comprising printed sheets |
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Application publication date: 20200703 |