A high-shiny silver frosted printing structure and printing method thereof

Abstract

The present invention discloses a high-gloss silver frosted printing structure and a printing method thereof, comprising from bottom to top a cardboard layer, a glue layer, a bright silver frosted layer, a high-transmittance PET layer and an offset printing layer; the printing method is: printing UV high-gloss silver frosted on the reverse side of a PET high-gloss transparent film, and then compounding it with a glass-like card bottom paper that has been surface coated and calendered to obtain a packaging material with a multi-layer structure and a high-gloss mirror-like shiny effect. The present invention prints UV high-gloss silver frosted on the reverse side of a PET high-gloss transparent film, and then compounding it with a bottom paper that has been surface coated and calendered to obtain a packaging material with a multi-layer structure and a high-gloss mirror-like shiny effect. The PET high-gloss film is both a carrier and protective layer for UV frosting and a fine graphic offset printing bearing layer, which realizes fine printing on the frosted coating. It is applied to the production of high-end packaging printed products, which is both beautiful and has excellent anti-counterfeiting function.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging box printing and relates to a high-shiny silver frosted printing structure and a printing method thereof. Background Art

[0002] PET high-transparency composite film is a new type of packaging material with excellent physical and chemical properties, dimensional stability and transparency. It is widely used in magnetic recording, photosensitive materials, electronics, electrical insulation, industrial films, packaging decoration, screen protection, optical mirror surface protection and other fields. PET composite film is more common in daily life as car explosion-proof film, mobile phone and tablet film, etc., but it is rarely used in small paper packaging printed products such as cigarette labels, mainly because the composite process with paper is complicated and the production cost is high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a high-shiny silver frosted printing structure and a printing method thereof to solve the problems existing in the prior art.

[0004] The technical scheme adopted by the present invention is: a high-shiny silver frosted printing structure, comprising from bottom to top a glass-like cardboard layer, a glue layer, a bright silver frosted layer, a high-transmittance PET layer and an offset printing layer.

[0005] A printing method for a high-gloss silver frosted printing structure comprises the following steps: printing UV high-gloss silver frosted on the reverse side of a PET high-gloss transparent film, and then compounding the film with a base paper that has been subjected to surface coating and calendering treatment, so as to obtain a packaging material with a multi-layer structure and a high-gloss mirror-like shiny effect.

[0006] A printing method of a high-shiny silver frosted printing method specifically comprises the following steps:

[0007] (1) The reverse side of the PET high-gloss transparent film is coated with UV high-gloss silver frosting printed with an anilox roller;

[0008] (2) drying the product prepared in step (1) and applying glue to the finished high-gloss silver frosted printed surface;

[0009] (3) Laminating the product coated with glue in step (2) with a base paper of a glass-like white card;

[0010] (4) Drying the composite product and printing pictures and texts;

[0011] (5) Printing thickened back coating while printing images and texts;

[0012] (6) The product after printing the image and text is dried to obtain the final printed product.

[0013] Preferably, the above-mentioned PET bright and highly transparent film has a thickness of 20-50 μm, a glue viscosity of 65±5S, and a solid content of ≥55%.

[0014] Preferably, the high-shiny silver matte ink is coated and printed by a doctor blade anilox roller, and the technical parameters of the anilox roller include an angle of 45°, a depth of 100-120 μm, and a screen line count of 40-50 lines. The anilox roller is then processed and shaped by engraving with a laser direct engraving machine.

[0015] Preferably, the above-mentioned PET bright and highly transparent film has a thickness of 21 μm, and the base paper has a thickness of 200 g / ㎡.

[0016] Preferably, the back-coated plate roller used in the above printing has a mesh size of 30 μm, a solid content of 55% and a viscosity of 20-24S.

[0017] Beneficial effects of the present invention:

[0018] Compared with the prior art, the effects of the present invention are as follows:

[0019] (1) The present invention prints UV high-gloss silver frosting on the reverse side of a PET high-gloss transparent film, and then composites it with a base paper that has been subjected to surface coating and calendering treatment, thereby obtaining a packaging material with a multi-layer structure and a high-gloss mirror-like shiny effect. The PET high-gloss film is both a carrier and protective layer for the UV frosting and a fine graphic offset printing carrier layer, thereby achieving fine printing on the frosted coating. The PET high-gloss film is applied to the production of high-end packaging printed products, which is both beautiful and has excellent anti-counterfeiting function.

[0020] (2) The printing method of the present invention can reduce the cost of purchasing raw materials by about 20% (converted into the market price of about 3,500 yuan / ton). Its advantage is that printing manufacturers can flexibly schedule production without being constrained by market supply and price changes;

[0021] (3) The present invention can meet the ink adhesion fastness of the product without the problem of color popping. Since the thickness of the PET bright and transparent film used is 20-50μm, which is 1-3 times thicker than the conventional PET composite film of 12-16μm, the adhesion of the composite glue layer is very high. If insufficient or uneven gluing occurs during production, it will cause the problem of printing (die-cutting) reverse pulling, affecting the stability of the printing quality of the finished product. In view of this technical requirement, the viscosity of the water-based composite glue used in the present invention is 65±5S, the solid content is ≥55%, and the coating amount is ≥6g / m² (wet coating amount), which basically meets the requirements of the line composite process, and the gravure UV meets the ink layer (using Shanxi Jinghua gravure red ink as the measurement standard) without color popping (tested by folding the indentation 90 degrees 10 times after normal printing);

[0022] (4) Ordinary PET high-gloss composite paper overemphasizes the mirror effect, selects a PET film of too high thickness, and ignores the packaging molding requirements, which will cause the average crease stiffness to exceed 80, resulting in the "explosion" phenomenon after molding. The present invention determines that the finished product is 265±7g by using 21um film + 200g / ㎡ base paper, and the mirror effect and molding effect can meet customer requirements;

[0023] (5) Ordinary PET composite paper easily absorbs moisture or loses water, causing the finished product to warp and deform. The thickened back coating effect of the present invention can help the material replenish moisture and lock in moisture to prevent moisture deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a high-shiny silver frosted printed structure;

[0025] Figure 2 The figure is a flow chart of the printing method. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments.

[0027] Example 1: Figure 1 As shown, a high-shiny silver frosted printing structure includes, from bottom to top, a cardboard layer 1, a glue layer 2, a bright silver frosted layer 3, a high-transmittance PET layer 4 and an offset printing layer 5.

[0028] Example 2: Figure 2 As shown, a printing method of a high-gloss silver frosted printing structure is as follows: the reverse side of a PET high-gloss transparent film is printed with UV high-gloss silver frosted ink using a customized anilox roller, and then the printed surface is compounded with a base paper that has been surface coated and calendered (to ensure the flatness of the paper surface) to obtain a multi-layered packaging material with a high-gloss mirror-like shiny effect.

[0029] At present, the common production model in the packaging and printing industry is: papermaking companies use professional laminating machines to produce composite paper, and printing companies purchase finished paper for printing. Due to the limitations of production equipment, printing companies often find it difficult to break away from traditional process thinking. The equipment used in the present invention is the Ceruti R960 gravure printing unit, which integrates laminating, transfer, and UV rotary printing functions. The advantage of this equipment is that it changes the traditional mode of division of labor between printing and papermaking. After completing the production of PET film composite paper materials, it is directly connected to the gravure production link, shortening the process flow and effectively reducing production costs. Figure 2 As shown, a printing method of a high-shiny silver frosted printing structure specifically comprises the following steps:

[0030] (1) The reverse side of PET high gloss transparent film is coated with anilox roller and printed with UV high gloss silver frosting;

[0031] (2) drying the product prepared in step (1) and applying glue to the printed surface;

[0032] (3) Laminating the coated product in step (2) with a base paper of a glass-like white card;

[0033] (4) Drying the composite product and printing pictures and texts;

[0034] (5) Printing thickened back coating while printing images and texts;

[0035] (6) The product after printing the image and text is dried to obtain the final printed product.

[0036] For the newly developed quick-drying composite adhesive formula, the hot air drying route design and process parameters were determined through experiments. On this basis, the drying system on the existing gravure printing unit was improved to achieve online stable composite.

[0037] Precise control of anilox roller gluing is one of the key links in quality control of this project. The cleaning process of anilox roller plays a vital role in the composite effect. The original manual cleaning method has a large workload and low efficiency, and it is easy to leak during cleaning. The gravure anilox roller circulation jet cleaning device (patent number ZL201110375800.8) is used. The device can realize the automatic cleaning of the anilox roller of the gravure printing machine, improve the cleaning effect and efficiency. And through the recycling of solution, the purpose of resource conservation and environmental protection is achieved.

[0038] Preferably, the above-mentioned PET bright and highly transparent film has a thickness of 20-50 μm, a glue viscosity of 65±5S, and a solid content of ≥55%.

[0039] Preferably, the high-shiny silver matte ink is coated and printed by a doctor blade anilox roller, and the technical parameters of the anilox roller include an angle of 45°, a depth of 100-120 μm, and a screen line count of 40-50 lines. The anilox roller is then processed and shaped by engraving with a laser direct engraving machine.

[0040] Preferably, the above-mentioned PET bright and highly transparent film has a thickness of 21 μm, and the base paper has a thickness of 200 g / ㎡.

[0041] Preferably, the back-coated plate roller used in the above printing has a mesh size of 30 μm, a solid content of 55% and a viscosity of 20-24S.

[0042] For the "Guiyan (Guojiuxiang)" product, the company takes advantage of the functional advantages of the Ceruddi equipment and uses PET high-gloss film to enhance the light transmittance of the frosted surface, achieving a high-gloss silver frosted effect.

[0043] Aiming at the technical requirements of in-line lamination of thick and multi-layer PET high-transparency films, key technologies such as base paper printing suitability, compound glue formulation process, and paper back coating process were studied. Through online lamination, a 5-layer PET high-shiny silver frosted composite paper was produced. The thickness of the PET composite film reached 30-40μm, and the transmittance reached 92-94%. The paper cost is expected to save about 3,500 yuan / ton compared with the purchased ready-made high-gloss frosted cardboard. The printed product can be exposed and placed indoors for 8 hours without obvious changes, and the yield rate reaches more than 96%, which solves the pre-press stability problem well. The method of the present invention realizes a new high-shiny silver frosted printing process, and applies PET high-transparency composite film to cigarette label printing for the first time, effectively enriching the expression form of gravure printing technology and broadening the creative space for product design. The production cost of the product is reduced by 3-5% on the existing basis, and the utilization rate of Ceruddy equipment is increased by 10-20% on the existing level, which plays an important role in optimizing product structure, accelerating transformation and upgrading, and improving economic benefits and market competitiveness.

[0044] The printing method of the present invention is used for experiments, and the experimental conclusions are: the ambient temperature and humidity are 22° C. and about 55% respectively, 200 g of raw white card paper is used, the PET high-gloss transparent film is 21 um, FH035 composite glue with a viscosity of 70s, a solid content of 55%, and moderate adhesive adhesion is used, Shanghai Kaxin PM202 high-gloss silver, a back-coated anilox roller of 30 um, and a back-coated ink flavor PH011. The aluminum-plated composite paper prepared has high flatness and smoothness, a fast drying speed, good surface tensile and tensile strength of the composite paper, and can achieve good printing suitability.

[0045] The first batch of trial production of Guiyan's "Hard Small National Liquor Fragrance 01" was completed. The trial production results showed that the paper printing suitability basically met the printing requirements, but the product was exposed to the indoor air for more than 4 hours and then absorbed moisture and deformed. After improving the back-coated anilox roller and back-coated ink parameters, the finished product can basically be exposed indoors for 8 hours without obvious changes, and the finished product rate reached about 96%.

[0046] The second batch of trial production of the product was completed. Trial production situation: After the PET high-gloss transparent film was coated with high-gloss frosted silver and paper, the printing suitability met the product production requirements. The printing ink had good adhesion. There was no back-pull phenomenon when tested with transparent tape. The printing suitability was normal when tested with offset printing. No back-pull phenomenon of the composite layer was found. This shows that the adhesion of the adhesive layer has been further improved after the composite adhesive formula was improved. The actual yield rate reached 98%.

[0047] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A printing method for a high-shiny silver frosted printing structure, characterized in that: The high-gloss silver frosted printing structure comprises, from bottom to top, a glass-like cardboard layer, a glue layer, a bright silver frosted layer, a high-transmittance PET layer and an offset printing layer; the printing method is to print UV high-gloss silver frosted on the reverse side of a PET high-gloss transparent film, and then compound it with a base paper that has been subjected to surface coating and calendering treatment, to obtain a packaging material with a multi-layer structure and a high-gloss mirror-like shiny effect; the specific steps include: (1) PET high gloss transparent film coated with UV high gloss silver frosting printed on the reverse side; (2) drying the product prepared in step (1) and applying glue to the finished high-gloss silver frosted printed surface; (3) Laminating the coated product in step (2) with a base paper of a glass-like white card; (4) Drying the composite product and printing pictures and texts; (5) Printing thickened back coating while printing images and texts; (6) Drying the printed product to obtain the final printed product; The thickness of PET bright and transparent film is 20-50μm, the viscosity of the glue used is 65±5S, and the solid content is ≥55%; The coating and printing are carried out by using a doctor blade anilox roller. The technical parameters of the anilox roller include an angle of 45°, a depth of 100-120μm, and a screen line count of 40-50 lines. The anilox roller is then processed and shaped by a laser direct engraving machine; the base paper is 200g / ㎡.

2. The printing method of a high-shiny silver frosted printing structure according to claim 1, characterized in that: Printed with high gloss silver matte ink.

3. The printing method of a high-shiny silver frosted printing structure according to claim 1, characterized in that: The back coating used in printing has a solid content of 55% and a viscosity of 20-24S.

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