CN113400828B - Printing method for producing local thick texture on metal flat plate for packaging - Google Patents
Printing method for producing local thick texture on metal flat plate for packaging Download PDFInfo
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- CN113400828B CN113400828B CN202110650397.9A CN202110650397A CN113400828B CN 113400828 B CN113400828 B CN 113400828B CN 202110650397 A CN202110650397 A CN 202110650397A CN 113400828 B CN113400828 B CN 113400828B
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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
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/28—Printing on other surfaces than ordinary paper on metals
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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
- B41M1/06—Lithographic printing
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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
- B41M1/12—Stencil printing; Silk-screen printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
Abstract
The invention relates to the technical field of metal flat plate printing for packaging, and provides a printing method for generating local thick texture of a metal flat plate for packaging aiming at the problem that the current printing process of the metal flat plate for packaging is difficult to bring thick touch, which comprises the following steps: (1) After the surface of the metal flat plate is coated with the varnish, the varnish layer is formed by curing; (2) Printing gloss oil on the part of the surface of the gloss oil layer needing to generate thick texture by adopting a lithographic offset printing method, and curing and drying to form an external gloss oil layer; (3) Thick film gloss oil is screen-printed on the surface of the external gloss oil layer, and then the thick film gloss oil layer is formed by curing and drying, so that the metal flat printing plate surface has plane hand feeling and local concave-convex hand feeling; the thick film gloss oil layer and the image-text ink layer at the bottom are coincided and responded, the edges of local images and texts are clear, and the thick film gloss oil layer has concave-convex thick texture.
Description
Technical Field
The invention relates to the technical field of metal flat plate printing for packaging, in particular to a printing method for generating local thick texture on a metal flat plate for packaging.
Background
Offset lithographic printing is the most widely used printing process for packaging metal plates: firstly, forming a base coat on the surface of a metal flat plate by adopting a rubber roll for roll coating, then printing pictures and texts by adopting a lithographic offset printing method, then coating a glossy oil layer on the surface of the metal flat plate subjected to picture and text printing by using a cylindrical rubber roller or a polyurethane roller in a roll coating mode for covering, and realizing the protection and personalized appearance effect on the surface of a printed matter by using a glazing process. However, the existing offset lithography process cannot bring the thick texture of metal offset lithography pictures and texts, mainly because the offset lithography pictures and texts and the gloss oil layer are both in a plane effect, the printing effects of the regular raised thick texture and the visual effect of the specific area boundary cannot be realized, and the form is monotonous and has certain limitation.
Chinese patent ZL2010296386.7, entitled "Mixed printing method of Metal Flat plate" discloses a method for printing on a metal flat plate such as tinplate, aluminum sheet and the like by adopting metal oil-based ink and ultraviolet curing ink. The individuation of the product is realized by matching the metallic ink and the ultraviolet curing ink, and meanwhile, the material is saved. However, the preparation process is still the traditional prime coat-offset lithography-brightening method in practice, and the local thick feeling of the metal flat plate cannot be realized.
Disclosure of Invention
The invention aims to provide a printing method for generating local thick texture on a metal flat plate for packaging, aiming at the problem that the traditional printing process of the metal flat plate for packaging is difficult to bring thick texture, and the local thick texture of a specific part can be printed on the metal flat plate for packaging.
The invention provides the following technical scheme:
a printing method for generating local thick texture of a metal flat plate for packaging comprises the following steps:
(1) After the surface of the metal flat plate is coated with the base coat, the base coat is formed by curing, then the image-text printing ink is printed and then the printing ink is cured to form the printing ink layer, and then the gloss oil is coated and then the printing ink layer is cured to form the gloss oil layer;
(2) Printing gloss oil on the part of the surface of the gloss oil layer needing to generate thick texture by adopting a lithographic offset printing method, and curing and drying to form an external gloss oil layer;
(3) And (3) screen-printing thick film gloss oil on the surface of the external gloss oil layer, and then curing and drying to form the thick film gloss oil layer.
In the prior art, individuation of a metal lithographic plate is mainly represented by exaggerated color, various color plates and the like, and the individualized effect expression is increased by utilizing a bright effect, and the fact that a three-dimensional effect is formed by local image-text protrusions is rarely considered, so that the experience of thick texture in touch and vision is brought. The reason for this is that it is difficult to produce a thick feel in the prior art, while it is cost effective. Because the ink layer thickness of the offset lithography pattern and text is thin in the current printing process, the locally obvious concave-convex hand feeling can not be realized through ink accumulation in consideration of the process and the cost; the roller coating of the rubber roller realizes full-page coating, and the coating accumulation of a local regular pattern area cannot be realized by the roller coating method of the rubber roller; although silk-screen printing can realize thicker ink layer accumulation than offset printing, metal offset printing uses more surface gloss oil types and has larger surface characteristic difference according to product requirements, so that the adhesion force of the silk-screen thick film gloss oil on the metal offset printing is unstable, the contact edge is easy to have sawtooth shrinkage, and the silk-screen thick film gloss oil is easy to fall off in the subsequent processing link; meanwhile, the method is limited by the smooth and fine surface of the metal flat plate, and the printing effect brought by the operation is poor. In order to bring obvious concave-convex hand feeling of local pictures and texts, the inventor researches to develop a new method on the basis of the existing metal lithography process, breaks through the idea of directly utilizing offset printing picture and text ink to stack to generate thick texture, needs to produce a printing plate specially at the local part with thick texture on the surface of a gloss oil layer, utilizes offset printing to form an external gloss oil layer, and then utilizes screen printing to stack the ink layer to obtain a thick film gloss oil layer.
Preferably, the gloss oil coated on the gloss oil layer in the step (1) is polyester resin, acrylic resin or epoxy resin, the solid content is 30-50 wt%, the weight of a construction dry film is 5-8 g per square meter, and the gloss oil is baked until the temperature of a metal flat plate is 150-180 ℃ and is kept for 10-12 minutes for curing. The glossy oil layer mainly plays a role in protecting the image and text of the offset lithography, and the appearance effect can be glossy, pearly-lustre, matte and the like, so that the product has good layout effect and processing resistance.
As the method of the invention is preferable, the main components of the gloss oil used in the step (2) are polyester acrylate, UV photoinitiator, pigment and auxiliary agent, the solid content is 90-100 wt%, wherein the polyester acrylate is 50-70 wt%, the UV photoinitiator is 8-10 wt%, the pigment is 18-25 wt%, and the auxiliary agent is 2-5 wt%. The external gloss oil layer is more suitable for selecting LED-UV semi-matte oil, can form obvious difference with the thick film gloss oil layer, enhances the thick texture, and controls the printing ink amount between 0.3CC and 0.6 CC.
Preferably, the curing in the step (2) is LED-UV illumination curing, and the light source intensity is more than or equal to 8W/cm 2 The value of the printing surface absorption energy is more than or equal to 300mj/cm 2 . The method has important influence on ensuring the adhesive force between the glossy oil layer and the external glossy oil layer and between the thick film glossy oil layers.
Preferably, the curing in the step (2) is LED-UV illumination curing, and the light source intensity is more than or equal to 8W/cm 2 The value of the absorption energy of the printing surface is more than or equal to 300mj/cm 2 . The external gloss oil layer is convenient to quickly cure, good interlayer binding force is formed among the gloss oil layer, the external gloss oil layer and the thick film gloss oil layer on the surface of the product, the adhesive force among the layers is more than or equal to II level, and the basic characteristics and the appearance effect of the original protective gloss oil on the surface of the product are reserved.
Preferably, the printing plate used in the offset lithography in the step (2) is a local image-text enlarged printing plate which is used for making the image-text edge size of the part needing to generate thick texture by an AI document. The shape and the size of the image and the text of the local silk-screen thick film gloss oil layer can be consistent with the shape and the size of the offset color printing image and text of the corresponding position on the surface of the metal plate, so that the local concave-convex effect is clearer.
As the optimization of the method of the invention, the external expansion size of the image-text edge is not less than the overprinting error of the image-text of the ink layer, the external gloss oil layer and the thick film gloss oil layer. The adhesive force of the silk-screen thick film gloss oil layer on the surface of a product is increased conveniently, the thick film gloss oil layer is prevented from cracking and falling off in the subsequent processing link, and the clear boundary of the local image-text part is ensured. The overprinting error is generally controlled to be less than or equal to 0.2mm, so the outward expansion size of the image-text edge is more than or equal to 0.2mm.
Preferably, the gloss oil used in the thick film gloss oil layer comprises polyester resin or acrylate resin as main components, and photoinitiator, wherein the solid content is 90-100 wt%, and the UV photoinitiator content is 5-10 wt%. The thick film gloss oil used in the invention is UV gloss oil, the curing speed of the UV gloss oil is high, the printing efficiency can be improved, and meanwhile, the surface of the silk-screen thick film gloss oil can be subjected to special treatment such as gold stamping, laser and the like according to the requirement.
Preferably, the method of the present invention is performed by thick film screen printing with a mesh size of 70 to 150 meshes/inch. The mesh number of the silk screen affects the thickness of the thick film gloss oil layer, local convex hand feeling can be formed after curing, and good binding force is mainly formed between the silk screen and the external gloss oil layer. The method of the invention can realize that the thickness of the thick film gloss oil layer is at least 30 mu m to present obvious concave-convex feeling, of course, the thickness of the thick film gloss oil layer is not as high as possible, and the upper limit height is lower than 500 mu m.
Preferably, the surface hardness of the glossy oil layer, the external glossy oil layer and the thick film glossy oil layer is not less than 2H pencil hardness. The bonding force and the strength of the three are ensured, and the damage of thick texture brought by subsequent processing is avoided.
The invention has the following beneficial effects:
the invention provides a method for generating local thick texture on the surface of a metal flat plate for packaging, which can realize that the metal flat plate printing plate has plane hand feeling and local concave-convex hand feeling; the thick film gloss oil layer and the image-text ink layer at the bottom are coincided and responded, the edges of local images and texts are clear, and the thick film gloss oil layer has concave-convex thick texture; the original base coat and protective gloss oil are used according to the characteristics of the product, so that the quality foundation and appearance style of the substrate of the metal packaging product are kept; the traditional metal packaging offset printing and silk screen printing missing process is compatible, the bottom layer protective gloss oil layer and the silk screen thick film gloss oil layer are well connected, and the requirement of the subsequent basic processing is met; the offset printing outer oil layer and the silk-screen thick film gloss oil layer respectively adopt LED-UV and UV photocuring processes, are more energy-saving and environment-friendly than the traditional thermal baking curing process, have high printing efficiency, and simultaneously reduce yellowing of the bottom color of a product and influence of baking furnace ash pollution on the appearance of a layout.
Drawings
FIG. 1 is an effect diagram of an automobile rust remover sample can made of the metal flat plate printed in example 1.
Detailed Description
The following further describes the embodiments of the present invention.
The starting materials used in the present invention are commercially available or commonly used in the art unless otherwise specified, and the methods in the following examples are conventional in the art unless otherwise specified.
The following description will be made by taking a metal plate for a rust remover sample tank of an automobile manufactured by Hangzhou ZhongLiang Meite Container Co.
Example 1
A printing method for generating local thick texture of a metal flat plate for packaging comprises the following steps:
(1) Coating a base coat on the surface of a metal flat plate, curing to form the base coat, printing image-text ink, curing to form an ink layer, coating gloss oil, and curing to form a gloss oil layer, wherein the specific steps are as follows:
coating a base coat: coating and priming by using a roll coating mode of vertically reserving an empty rubber roller on the whole plate surface, wherein the used ink is an MC-UV-C504 white Keding product which is produced by the chemical company Limited in the Conn Ling of Fushan City and has the solid content of 65 +/-2 percent (m/m), and the dry film is dried by a heating and curing mode of 180 ℃/12 minutes, and the weight of the coated dry film is 13 g/square meter;
printing image-text ink: one or more printing is carried out according to different layouts to form a printing ink layer, and in the embodiment, three printing passes are carried out, wherein the following printing inks are respectively adopted:
1PASS: UVLED red special + UVLED blue special;
2PASS: UVLED red special + UVLED blue special;
3PASS: UVLED6662-2 four-color red + UVLED4411-2 four-color blue + UVLED8018 black ink + UVLED yellow; the special UVLED red, the special UVLED blue and the special UVLED yellow are prepared by UVLED series ink produced by the Conlin chemical industry Co., ltd, the city of Buddha; UVLED6662-2 four-color red and UVLED4411-2 four-color blue adopt UVLED series printing ink produced by Conlin chemical limited company of Fushan City, and the printing ink is irradiated and dried by using an LED-UV curing light source;
coating gloss oil: coating in a manner of rolling and coating a whole plate surface by vertically reserving an empty rubber roll, wherein the used bright oil is HF-701H bright oil produced by Brehling chemical Limited company in Fushan City, the main component of the bright oil is acrylic resin, the solid content of the bright oil is 45 +/-2 percent (m/m), the bright oil is dried in a heating and curing manner of baking a metal flat plate at the temperature of 180 ℃ for 12 minutes, and the weight of a coating dry film is 8 g/square meter;
the surface hardness of the bright oil layer is the hardness of a 2H pencil;
(2) Printing external gloss oil on the part of the surface of the gloss oil layer needing to generate thick texture by adopting a lithographic offset printing method, and curing and drying to form the external gloss oil layer, wherein the method specifically comprises the following steps:
the used printing ink is SCP ULED-540W printing LED-UV semi-matte oil produced by Shanghai super-color printing ink company Limited;
separately manufacturing corresponding printing plates according to the parts needing to generate thick texture, transferring the semi-matte oil layer of the printing plates to the specific parts needing to generate thick texture on the surface of the metal flat plate through a rubber blanket, irradiating, curing and drying by using an LED-UV light source to form an external gloss oil layer, wherein the light source intensity is 8W/cm 2 The value of the energy absorbed by the printing surface is 300mj/cm 2 The ink amount is controlled to be 0.5CC;
controlling the surface tension of the external gloss oil layer to be 36dyn/cm;
controlling the surface hardness of the external gloss oil layer to be the hardness of a 2H pencil;
(3) The method comprises the following steps of screen printing thick film gloss oil on the surface of an external gloss oil layer, and then curing and drying to form a thick film gloss oil layer, wherein the method specifically comprises the following steps:
the gloss oil is UV-JS-LS laser gloss oil produced by Hangzhou constant base coating ink company Limited;
separately manufacturing corresponding screen printing plates according to the parts needing to generate thick texture, wherein the mesh number of screen printing is 100/inch;
transferring the thick film gloss oil through pressure of a scraper to a specific part of the surface of the metal flat plate, which needs to generate thick texture, and then irradiating, curing and drying by using a UV light source;
the surface hardness of the thick film gloss oil layer is controlled to be 2H pencil hardness.
The metal plate printed through the above process is used to make a rust remover-like can for automobiles, and as shown in fig. 1, it can be seen that a portion where a thick texture is required, i.e., an english letter "WD-40" has a remarkable concavo-convex thick texture as compared to other portions.
Example 2
The difference from the embodiment 1 is that when the single lithographic printing plate is prepared in the step (2), the prepared printing plate is a local image-text amplification plate with the image-text edge size expanded outwards, which is prepared by using an AI file to the part needing to generate thick texture, and the local image-text amplification plate is printed on the surface of a metal flat plate by a lithographic offset press to realize the edge expansion of local images and texts, wherein the overprinting error of the ink layer image-text, the external gloss oil layer and the thick film gloss oil layer is controlled to be 0.15mm, and the image-text edge size is expanded outwards by 0.2mm.
Example 3
The difference from the embodiment 2 is that when the single printing plate is manufactured before the printing layer of the offset lithographic printing in the step (2), the manufactured printing plate is a local image-text enlarged plate for manufacturing the image-text edge size extension of the part needing to generate thick texture through an AI file, so that the local image-text enlarged plate is printed on the surface of a metal flat plate by an offset lithographic printing machine to realize the edge extension of local image-text, wherein the overprinting error of the image-text of the ink layer, the printing layer of the external gloss oil and the printing layer of the thick film is controlled to be 0.15mm, and the image-text edge size extension is 0.3mm.
Example 4
The difference from the embodiment 2 is that,
the weight of the dry coating film coated with the gloss oil in the step (1) is 10g per square meter;
in the step (2), an external gloss oil layer is formed by irradiating, curing and drying through an LED-UV light source with the intensity of 12W/cm 2 The value of the energy absorbed by the printing surface is 450mj/cm 2 The ink amount is controlled to be about 0.6 CC;
controlling the surface tension of the external gloss oil layer to be 42dyn/cm;
the mesh number of the screen printing in the step (3) is 120 pieces/inch;
the surface hardness of the bright oil layer, the external gloss oil layer and the thick film gloss oil layer is controlled to be 3H pencil hardness.
Example 5
The difference from example 2 was that the surface hardness of the glossy oil layer and the thick film glossy oil layer was controlled to be 4H pencil hardness, and the hardness of the outer glossy oil layer was controlled to be 2H pencil hardness.
Comparative example 1
The difference from the embodiment 1 is that the process of the step (3) is performed after the graphic ink layer is prepared in the step (1), namely, the printing ink is directly printed on the screen of the lithographic offset graphic to realize the ink accumulation, and then the gloss oil layer is coated (the roller coating causes the extrusion damage), and the step (2) in the embodiment 1 is omitted.
Comparative example 2
The difference from example 1 is that step (2) in example 1 was omitted directly, i.e., the ink was screen printed directly on the gloss oil layer to achieve ink build-up.
Comparative example 3
The difference from example 1 is that the surface tension of the external gloss oil layer prepared in step (2) is 30dyn/cm.
Comparative example 4
The difference from example 2 is that the surface hardness of the glossy oil layer and the thick film glossy oil layer was controlled to be 2H pencil hardness, and the outer glossy oil layer was controlled to be H pencil hardness.
The detection of the quality of the finished product comprises an adhesion test, a surface hardness test, an anti-scratch test and a thick part printing thickness test.
Quality of the finished product
1. Surface hardness test: in the above examples and comparative examples, the surface hardness was measured using a Chinese-style pencil reference GB/T6739.
2. And (3) testing the adhesive force: the use of a 3M #610 tape was performed in accordance with GB1720-1979, but without the need for grid or circle marking on the silkscreen thick film varnish layer, and the results are shown in Table 1.
3. The surface scratch resistance test method comprises the following steps: the 150mm × 100mm piece of sample was placed on a flat plate base of a SHEEN hardness tester with the coated surface facing upward, fixed, and the flat plate base was moved at a constant speed from left to right with weights added, and the results are shown in table 1, using the weight grams of the weight without exposing the bottom as the standard of the coating hardness.
4. Local thick part printing thickness test: and measuring by using a micrometer, namely firstly measuring the total thickness of the thick gloss oil layer area of the silk screen of the metal flat plate, measuring three dispersed points and averaging, then measuring the thickness of the surface protection gloss oil area of the metal flat plate, measuring three dispersed points and averaging, and taking the difference value of the front average value and the rear average value as the average thickness of the printing bulges of the local thick part.
The results of the above tests are shown in Table 1.
TABLE 1 quality of the printed Metal plates obtained in the examples and comparative examples
Note: comparative example 1 after the varnish layer was roll-coated, the thick film varnish layer was damaged by extrusion.
As can be seen from the above table, the local thick texture of the metal flat plate for packaging can be achieved by the method of the present invention, and at least level II and above adhesion is maintained between the layers:
from the comparison between the embodiment 1 and the embodiment 2, when the external gloss oil layer is offset printed on the lithographic plate, the external expansion of the size of the printing plate corresponding to local images and texts is beneficial to improving the adhesive force between the thick film gloss oil layer and the external gloss oil layer;
as can be seen from comparison between comparative example 1 and example 1, in the existing offset printing process for metal plates, the silk screen printing ink is directly deposited on the offset printing image-text, although a certain height of deposition can be achieved, the adhesion of the silk screen printing ink is poor, and meanwhile, in the subsequent processes such as roll coating and glazing, the silk screen printing layer is easily damaged, the film thickness is reduced, and meanwhile, local image-text deformation is caused;
from the comparison of comparative example 2 with example 1, it is clear that the screen printing effect directly on the gloss oil layer is not very good, the adhesion between the gloss oil layer and the thick film gloss oil layer is low, and the thick film gloss oil layer is easily damaged in the subsequent processing and the transportation and storage of the packaging worker;
compared with the embodiment 1, the reasonable control of the surface tension of the external gloss oil layer is important for realizing the method;
it can be seen from comparison of comparative example 4, example 5 and example 2 that controlling the surface hardness of the gloss oil layer, the external gloss oil layer and the thick film gloss oil layer to be not less than 2H of pencil leads to positive effects, and further, maintaining the consistency of the surface hardness of the gloss oil layer, the external gloss oil layer and the thick film gloss oil layer is also beneficial to improving the adhesion between the layers of the product and keeping the adhesion between the layers to be not less than grade I.
Claims (6)
1. A printing method for generating local thick texture of a metal flat plate for packaging is characterized by comprising the following steps:
(1) After the surface of the metal flat plate is coated with the base coat, the base coat is formed by curing, then the image-text printing ink is printed and then the printing ink is cured to form the printing ink layer, and then the gloss oil is coated and then the printing ink layer is cured to form the gloss oil layer;
(2) Printing gloss oil on the part of the surface of the gloss oil layer needing to generate thick texture by adopting a lithographic offset printing method, and curing and drying to form an external gloss oil layer;
(3) Screen-printing thick film gloss oil on the surface of the external gloss oil layer, and then curing and drying to form a thick film gloss oil layer;
the surface tension of the external gloss oil layer is 36-42 dyn/cm;
the surface hardness of the bright oil layer, the external gloss oil layer and the thick film gloss oil layer is more than or equal to the hardness of 2H pencil;
the printing plate used in the offset lithography in the step (2) is a local image-text amplification printing plate which is used for manufacturing the image-text edge size expansion of the part needing to generate thick texture through an AI file;
the external expansion size of the image-text edge is not less than the overprinting error of the ink layer, the external gloss oil layer and the thick film gloss oil layer corresponding to the thick texture part.
2. The printing method for generating local thick texture on the metal flat plate for packaging as claimed in claim 1, wherein the gloss oil coated on the gloss oil layer in the step (1) is polyester resin, acrylic resin or epoxy resin, the solid content is 30-50 wt%, the weight of the construction dry film is 5-8 g/square meter, and the metal flat plate is baked at the temperature of 150-180 ℃ for 10-12 minutes to be cured.
3. The printing method for producing a partial thick texture on a flat metal plate for packaging according to claim 1, wherein the gloss oil used in the step (2) comprises polyester acrylate, UV photoinitiator, pigment and auxiliary agent, and has a solid content of 90-100 wt%, wherein the polyester acrylate is 50-70 wt%, the UV photoinitiator is 8-10 wt%, the pigment is 18-25 wt%, and the auxiliary agent is 2-5 wt%.
4. The printing method for producing the local thick texture on the metal flat plate for packaging as claimed in claim 1 or 3, wherein the curing in the step (2) is LED-UV light curing, and the light source intensity is not less than 8W/cm 2 The value of the absorption energy of the printing surface is more than or equal to 300mj/cm 2 。
5. A printing method for producing a partial thick texture on a metal flat plate for packaging as claimed in claim 1, wherein the gloss oil for the thick film gloss oil layer is mainly composed of polyester resin or acrylate resin, and photoinitiator, the solid content is 90-100 wt%, and the UV photoinitiator content is 5-10 wt%.
6. The printing method for creating a partial thickness feeling in a flat metal sheet for packaging as claimed in claim 1, wherein the thick film screen printing is performed using a thick film screen having a mesh size of 70 to 150 meshes/inch.
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| CN102732094A (en) * | 2012-05-21 | 2012-10-17 | 史海生 | LED-UV surface light source light-curing silk-screen printing ink composition and preparation method thereof |
| CN103317870A (en) * | 2013-07-05 | 2013-09-25 | 杭州中粮包装有限公司 | Method of printing high-resistance glossy-matte metal |
| CN104626778A (en) * | 2015-03-16 | 2015-05-20 | 苏州印刷总厂有限公司 | Technological method capable of achieving high-metal-luster effect of local surface of print matter |
| CN108790448A (en) * | 2018-06-22 | 2018-11-13 | 杭州四色印刷有限公司 | A kind of printing process of three-dimensional touch pattern |
| CN111892858A (en) * | 2020-06-11 | 2020-11-06 | 广州市恒远彩印有限公司 | Lithographic offset printing ink fountain UV gloss oil capable of realizing local laser transfer and lithographic offset printing method |
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