Method for manufacturing a folding-resistant transfer silver card box and silver card box manufactured by the method

Abstract

The application relates to the technical field of silver card paper processing, and particularly discloses a preparation method of a folding-resistant transfer silver card box and a silver card prepared by the method. The preparation method of the folding-resistant transfer silver card box comprises the following steps: compounding an aluminum plating film and base paper, drying to obtain an aluminum plating layer after removing a protective film on the surface of the aluminum plating film; coating a primer on the surface of the aluminum plating layer away from the base paper, drying to obtain a primer layer; coating ink on the surface of the primer layer away from the aluminum plating layer, light curing to obtain an ink layer; coating a glazing oil on the surface of the ink layer away from the primer layer, light curing to obtain a glazing oil layer; die cutting a score line, and the preparation is completed; the preparation raw material of the primer comprises an acrylic resin; and the width of the score line is 1-1.1 mm. The silver card has better folding resistance, does not have an obvious burst problem after being folded at an external force of 180 degrees for 5 times, the folding resistance of the existing silver card is improved from 1 time to 5 times, and the problem that the silver card of the existing paper box is not resistant to bending at the score line is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of silver card paper processing, in particular to a preparation method of a folding-resistant transfer silver card paper box and a silver card paper prepared by the method. BACKGROUND

[0002] The light silver card paper is widely used in the printing industry due to its unique mirror printing effect, and is divided into film-coated silver card paper and film-removed transfer silver card paper according to the process. The film-coated silver card paper is obtained by first spraying aluminum onto a plastic film by a vacuum method to form an aluminum-coated film, and then attaching the aluminum-coated film to ordinary white silver card paper by heating, pressing and gluing. The silver surface effect produced by this method is excellent, but the product does not meet the environmental protection requirements because there is a layer of plastic film. In order to solve the environmental protection problem, the film-removed transfer silver card paper tears off the plastic film at the later stage of the process and applies a gloss ink, which solves the environmental protection problem well.

[0003] The current film-removed transfer silver card paper structure includes base paper, transfer aluminum-coated layer, UV ink layer and UV gloss layer. When the silver card paper is used to manufacture a paper box, an indentation is die-cut on the film-removed transfer silver card paper by using an indentation line indentation bottom die, and then the paper box is formed by folding along the indentation.

[0004] However, in actual use, the cover (a folding cover on the paper box used to close the opening) needs to be repeatedly folded, and under the driving of external force, the ink or aluminum layer will burst after being folded only once in the positive and negative directions by 180°, which affects the appearance of the package and the use. SUMMARY

[0005] In order to reduce the bursting phenomenon of the silver card paper indentation caused by folding, the application provides a preparation method of a folding-resistant transfer silver card paper box and a silver card paper prepared by the method.

[0006] In the first aspect, the application provides a preparation method of a folding-resistant transfer silver card paper box, which adopts the following technical scheme: a preparation method of a folding-resistant transfer silver card paper box, comprising the following steps:

[0007] S1, combining the aluminum-coated film with the base paper, and obtaining the aluminum-coated layer after removing the protective film on the surface of the aluminum-coated film;

[0008] S2, coating a base oil on the surface of the aluminum-coated layer away from the base paper, and drying to obtain a base oil layer;

[0009] S3, coating an ink on the surface of the base oil layer away from the aluminum-coated layer, and curing under light to obtain an ink layer;

[0010] S4, coating a gloss ink on the surface of the ink layer away from the base oil layer, and curing under light to obtain a gloss ink layer;

[0011] S5, die-cutting an indentation line and pasting a box, and obtaining the folding-resistant transfer silver card paper box;

[0012] The preparation raw material of the base oil comprises an acrylic resin; and the width of the score line is 1-1.1 mm.

[0013] By adopting the above technical solution: the ink layer is prone to burst due to its thick and brittle characteristics, which causes the silver card paper to burst, therefore, the base oil layer is added, which improves the flexibility of the silver card paper on the one hand, and bears the ink layer and reduces the burst problem of the ink layer on the other hand; meanwhile, the width of the score line is widened to the above range, which improves the strength at the crease, and the above conditions are comprehensively improved, so that the folding resistance of the silver card paper box is improved.

[0014] When no base oil or a score line with a narrower width is used, the silver card paper cracks after being folded only once, the cracking grade is 5.5-7 after being folded five times, and the aluminum layer peeling grade is 29-37; when the base oil and the wider score line are used at the same time, the silver card paper does not crack after being folded once, the cracking grade is significantly reduced to 3.8 after being folded five times, and the aluminum layer peeling grade is reduced to 15, so that the folding resistance of the silver card paper is significantly improved.

[0015] Optionally, the acrylic resin is a modified acrylic resin, and the preparation raw material thereof comprises:

[0016] an acrylic emulsion, a polyurethane emulsion, amino silicone oil, and ethyl vanillin.

[0017] By adopting the above technical solution: the polyurethane gives the modified acrylic resin better flexibility and adhesion according to its own properties, and the combination of the two serves as a basic material for improving the flexibility of the silver card paper; and under the joint action of the ethyl vanillin and the amino silicone oil, the softness of the silver card paper can be further significantly improved, which may be due to the following reasons: 1, the hydrogen bond effect between the molecular chains of the paper fibers is destroyed, so that the strength of the silver card paper is reduced; 2, the performance of the polyurethane emulsion is improved, etc.

[0018] Compared with the use of the acrylic resin, the cracking grade of the silver card paper after being folded five times is significantly reduced from 3.8 to 2.3 when the modified acrylic resin is used, so that the folding performance of the silver card paper is further improved, and the burst problem is significantly reduced.

[0019] Optionally, the preparation method of the modified acrylic resin is as follows:

[0020] The polyurethane emulsion is added to the acrylic emulsion, stirred and mixed, the ethyl vanillin ethanol solution and the amino silicone oil are added, heated, and reacted to obtain the base oil.

[0021] By adopting the above technical solution: the process is simple, the conditions are mild, and it is conducive to the industrialized scale-up of the preparation of the base oil.

[0022] Optionally, the weight ratio of the ethyl vanillin ethanol solution, the amino silicone oil and the acrylate emulsion is (0.3-0.5):(0.2-0.25):1.

[0023] By adopting the above technical solution: when the weight ratio of the ethyl vanillin ethanol solution, the amino silicone oil and the polyurethane emulsion is within the above range, the folding resistance of the silver card paper is better.

[0024] Optionally, the concentration of the ethyl vanillin ethanol solution is 20wt%-40wt%.

[0025] By adopting the above technical solution: when the concentration of the ethyl vanillin ethanol solution is within the above range, the addition amount of ethyl vanillin in the modified acrylate system is appropriate, and the folding resistance of the silver card paper is better.

[0026] Optionally, the preparation raw material of the base oil further includes an acrylic copolymer, a wax emulsion, an additive, and a solvent, and the addition amount of the modified acrylic resin accounts for 10-30% of the mass of the base oil.

[0027] By adopting the above technical solution: when the preparation raw material of the base oil contains the above substances, the adhesion of each layer on the surface of the paper is better, and the paper is not easy to burst, and especially when the use amount of the modified acrylic resin is within the above range, the folding resistance of the prepared silver card paper is better.

[0028] Optionally, the base oil is composed of the following components in terms of weight percentage:

[0029] The modified acrylic resin is 15-25%, the acrylic copolymer is 48-80%, the wax emulsion is 3-5%, the additive is 1-2%, and the solvent is the rest.

[0030] Optionally, the coating amount of the base oil is 9-18g / m 2 .

[0031] By adopting the above technical solution: the coating amount of the base oil will affect the flexibility and folding resistance of the silver card paper, and should be within the above range.

[0032] Optionally, the coating conditions of the base oil are: temperature 20-30℃, humidity 45-55%.

[0033] In a second aspect, the application provides a silver card paper, which adopts the following technical solution:

[0034] A silver card paper is prepared by the preparation method of the folding-resistant transfer silver card paper box.

[0035] Compared with the silver card paper on the market, the silver card paper prepared by the process has significantly improved folding resistance, no cracking after one folding, significantly reduced cracking after five foldings, and significantly reduced aluminum layer peeling grade, which shows that the use performance of the silver card paper cannot be significantly affected by external force bending within five times, and a new idea for prolonging the service life of the carton is provided.

[0036] In summary, the present application has the following beneficial effects:

[0037] 1. In the preparation process of the present application, the folding resistance of the prepared silver card paper is improved to no obvious cracking problem after five times of external force folding by increasing the base oil layer and widening the indentation line width from the aspects of improving the flexibility of the base paper and improving the precision and strength of the indentation.

[0038] 2. In the preparation process of the present application, the flexibility of the silver card paper is further improved by using modified acrylic resin in the base oil, and the flexibility and wear resistance of the silver card paper are improved by the combined action of ethyl vanillin and amino silicone oil, which reduces the cracking problem at the indentation line and is beneficial to improve the number of bendable times at the indentation line.

[0039] 3. The silver card paper prepared by the process of the present application not only has no cracking after one folding, but also has extremely low cracking grade and less aluminum layer peeling grade after five foldings, and the folding resistance of the silver card paper is significantly improved, and the carton made of the silver card paper has more excellent performance. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below in combination with examples.

[0041] Preparation Example 1

[0042] A modified acrylic resin, the components and their corresponding weights are shown in Table 1, and is prepared by the following steps:

[0043] The polyurethane emulsion is added to the acrylic emulsion (water-based acrylic emulsion), stirred and mixed at 30℃ for 10min, then the ethyl vanillin ethanol solution and amino silicone oil are added, and the temperature is raised to 50℃ and stirred for 30min.

[0044]

The water-based acrylic emulsion is CTD-6070 from Changzhou Jilon Chemical Co., Ltd.; the polyurethane emulsion is ybl from Jinan Yuanbaolai Chemical Technology Co., Ltd.; the ethyl vanillin ethanol solution is obtained by blending ethyl vanillin and 95% (V / V) ethanol, and the concentration of ethyl vanillin is 18wt%; the amino silicone oil is DN-89S54 from Shandong Dennon New Material Technology Co., Ltd.

[0045] Table 1: Components and their weights (kg) in Preparation Examples 1-4 and Comparative Preparation Examples 1-4

[0046]

[0047] Preparation Examples 5-7

[0048] A modified acrylic resin, with the difference from Preparation Example 3 being that the ethyl vanillin ethanol solution concentration is as follows: Preparation Example 5, 20 wt% concentration of ethyl vanillin.

[0049] Preparation Example 6, 30 wt% concentration of ethyl vanillin.

[0050] Preparation Example 7, 40 wt% concentration of ethyl vanillin.

[0051] Example 1

[0052] A folding-resistant transfer silver card box is prepared by the following steps:

[0053] S1, vacuum-composite the aluminum plating film with the base paper, then remove the protective film on the surface of the aluminum plating film, and cool to 25°C to obtain an aluminum plating layer;

[0054] S2, coat a primer on the surface of the aluminum plating layer away from the base paper at a coating amount of 7 g / m 2 , under the conditions of a temperature of 25°C, a humidity of 50%, and a speed of 10,000 sheets / h, dry at 120°C for 30 min to obtain a primer layer;

[0055] S3, coat ink on the surface of the primer layer away from the aluminum plating layer, under the conditions of a temperature of 25°C, a humidity of 50%, and a speed of 10,000 sheets / h, and UV light curing at 90 mj / cm 2 to obtain an ink layer with a thickness of 5 μm;

[0056] S4, coat a glazing oil on the surface of the ink layer away from the primer layer at a coating amount of 9 g / m 2 , under the conditions of a temperature of 25°C, a humidity of 50%, and a speed of 10,000 sheets / h, and UV light curing at 90 mj / cm 2 to obtain a glazing oil layer;

[0057] S5, use a bottom film mold with a width of 1.7 mm and a depth of 0.4 mm indentation groove, under the conditions of a temperature of 25°C, a humidity of 50%, and a speed of 6,000 sheets / h, and use a 1.05 mm wide knife die to die-cut a 1.05 mm wide indentation line, and paste the box, to obtain the folding-resistant transfer silver card box.

[0058] 【Base paper: Huaxia Taiyang A-grade white card paper, with a grammage of 350 g / m 2, thickness 0.47 mm; the aluminum foil was from Shanghai Zijiang Aluminum Coating Environmental Protection Material Co., Ltd., thickness 13 silk; the ink was from Shengweike Ink Co., Ltd., model 770-9500; the glazing oil was from Shanghai Gaobang Printing Material Co., Ltd., model GB-8065;

[0059] It should be noted that the indentation line width in the present application can be selected in the range of 1-1.1 mm, which does not have a great impact on the performance of the silver card paper, and only 1.05 mm is taken as an example for brief introduction.

[0060] The base oil was obtained by blending 10 kg of water-based acrylate emulsion (model CTD-6070 from Changzhou Jilon Chemical Co., Ltd.), 80 kg of acrylic copolymer (styrene-acrylic acid copolymer emulsion, from Wuhan Jixinyibang Biological Technology Co., Ltd.), 3 kg of wax emulsion (model BYK-AQUACER-539), 1 kg of additive (docusate sodium (sulfonated dioctyl succinate sodium salt)), and 6 kg of solvent (water) until uniform.

[0061] Comparative Example 1

[0062] A folding-resistant transfer silver card box, which differs from Example 1 in that step S2 is not performed, i.e., no base oil layer is coated.

[0063] Comparative Example 2

[0064] A folding-resistant transfer silver card box, which differs from Example 1 in that in step S5, the indentation line width is 0.71 mm.

[0065] Examples 2-8 and Comparative Examples 3-6

[0066] A folding-resistant transfer silver card box, which differs from Example 1 in that in the preparation of the base oil, an equal amount of modified acrylic resin is used instead of water-based acrylate emulsion, and the use of the modified acrylic resin is as shown in Table 3.

[0067] Table 3 Use of modified acrylic resin in Examples 2-8 and Comparative Examples 3-6

[0068] Example 2 3 4 5 6 7 8 Preparation Example of Modified Acrylic Resin 1 2 3 4 5 6 7 Comparative Example 3 4 5 6 / / / Comparative Preparation Example of Modified Acrylic Resin Comparative Preparation Example of Modified Acrylic Resin 1 2 3 4 / / /

[0069] Examples 9-12

[0070] A folding-resistant transfer silver card box, which differs from Example 7 in that in the preparation of the base oil, the amounts of the components used are different, as shown in Table 4.

[0071] Table 4 Components of the base oil used in Examples 7, 9-12 and their weights (kg)

[0072]

[0073] Examples 13-15

[0074] A folding-resistant transfer silver card box, which is different from Example 10 in that the coating amount of the base oil in step S2 is different, and is specifically as follows:

[0075] Example 10, the coating amount of the base oil is 7 g / m 2 .

[0076] Example 13, the coating amount of the base oil is 9 g / m 2 .

[0077] Example 14, the coating amount of the base oil is 13 g / m 2 .

[0078] Example 15, the coating amount of the base oil is 18 g / m 2 .

[0079] Examples 16-17

[0080] A folding-resistant transfer silver card box, which is different from Example 14 in that the coating conditions of the base oil are different, as follows:

[0081] Example 16, coated at a temperature of 20°C and a humidity of 45%.

[0082] Example 17, coated at a temperature of 30°C and a humidity of 55%.

[0083] Performance detection

[0084] In the examples and comparative examples, the transfer silver card prepared without pasting the box was subjected to the following performance detection, and the detection results are recorded in Table 6.

[0085] Detection method

[0086] 1. Cracking grade: Fold the silver card along the indentation line to the front of the silver card by 180° once, and observe under a twenty-fold magnifying glass at a distance of 400 mm. Record whether the silver card has cracking, and mark it as cracking condition;

[0087] If there is no cracking, fold the silver card again according to the above operation for four times (a total of five times) to divide the silver card into 10 equal distance segments along the length of the indentation line. Observe under a twenty-fold magnifying glass at a distance of 400 mm, and divide the cracking degree of each segment according to Table 5 into 7 levels. Calculate the average of the cracking degree of 5 segments of each silver card, and mark it as cracking grade. The smaller the data, the lighter the damage degree.

[0088] 2. Adhesion of aluminum layer: refer to detection method 1, fold the silver card paper once, refer to the method in GB / T 13217.7-2007, under the condition of humidity 60% and temperature 30℃, adhere 3M tape on the indentation line and use the peeling tester to do T type peeling with uniform speed and force, then take off the silver card paper and cover the transparent millimeter grid paper (total 50 grids) on the part that is peeled off, count the number of grids of aluminum layer peeling respectively, the smaller the number, the more difficult the aluminum layer on the surface of the silver card paper to peel off after folding, and the stronger the folding resistance of the silver card paper.

[0089] Table 5 Grading table

[0090]

[0091]

[0092] Detection results

[0093] Table 6 Performance detection results

[0094]

[0095]

[0096] In combination with Table 6, Example 1, Comparative Example 1-2, the silver card paper prepared in Example 1 is not cracked after being folded once, the cracking level after being folded five times is only 3.8, the number of aluminum layer peeling grids is 15, and the folding resistance of the silver card paper is relatively good;

[0097] Comparative Example 1 lacks the primer layer compared with Example 1, the silver card paper is cracked after being folded once, and the cracking level after being folded five times is as high as 7, and the number of aluminum layer peeling grids is 37;

[0098] Comparative Example 2 reduces the indentation line width compared with Example 1, the silver card paper is cracked after being folded once, the cracking level after being folded five times is 5.5, and the number of aluminum layer peeling grids is 29;

[0099] In summary, in Example 1, because the primer layer and the indentation line width are simultaneously increased, the cracking of the silver card paper after being folded five times is relatively light, and the aluminum layer is not easy to peel off, which reduces the aluminum layer and ink cracking of the silver card paper after being folded, and improves the folding resistance of the silver card paper.

[0100] Comparative Examples 1, 2, and Comparative Examples 3-6, wherein,

[0101] The difference between Example 2 and Example 1 is that in the preparation process of the primer, an equal amount of modified acrylic resin is used instead of water-based acrylic emulsion, and the cracking level is significantly reduced to 2.3, and the number of aluminum layer peeling grids is reduced to 9. It shows that by using polyurethane emulsion, ethyl vanillin and amino silicone oil to modify the modified acrylic ester, the cracking of the silver card paper can be significantly reduced.

[0102] The reason for this may be that the polyurethane emulsion serves as the base of the high-flexibility base oil layer, and the ethyl vanillin and amino silicone oil work together to further improve the flexibility by destroying the hydrogen bond between the molecular chains of the paper fibers or by improving the performance of the polyurethane, thereby significantly enhancing the flexibility of the silver card paper, and none of the layers is prone to bursting after folding.

[0103] The cracking grades in Comparative Examples 3-6 are all between the cracking grades of Example 1 and Example 2, indicating that when one or two of the polyurethane, ethyl vanillin, and amino silicone oil are missing from the modified acrylic resin, the folding resistance of the silver card paper is significantly lower than that of Example 2. Moreover, the data of Comparative Examples 4 and 5 are the same and do not significantly improve the folding resistance of the silver card paper, indicating that when one of the ethyl vanillin or amino silicone oil is missing, the folding resistance of the silver card paper is not improved.

[0104] The difference between Example 3-5 and Example 2 is that the usage amounts of the components of the base oil are different, and the cracking grade and the aluminum layer peeling grade are further reduced, indicating that when the usage amounts of the polyurethane, ethyl vanillin, and amino silicone oil should be within the range of Example 3-5, the folding resistance of the silver card paper is further improved.

[0105] The difference between Example 6-8 and Example 4 is that the concentration of ethyl vanillin gradually increases, and the cracking grade and the aluminum layer peeling grade decrease, indicating that increasing the usage amount of ethyl vanillin can improve the folding resistance of the silver card paper, but the comprehensive cost and other factors should be within the range of Example 6-8.

[0106] The difference between Example 9-12 and Example 7 is that the usage amounts of the components of the base oil are different. When the usage amounts of the components of the base oil are within the range of Example 9-11, the cracking grade and the aluminum layer peeling grade decrease, and the folding resistance of the silver card paper is improved.

[0107] It should be noted that in the later stage of improving the base oil, the performance has already been very excellent, so the improvement range of the performance is very limited, and therefore there is a consistent data phenomenon.

[0108] The specific embodiments are merely an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method for preparing a fold-resistant transfer silver cardboard box, characterized in that, Includes the following steps: S1. The aluminum-coated film is laminated with the base paper, and the protective film on the surface of the aluminum-coated film is removed to obtain the aluminum-coated layer. S2. Apply a base oil to the surface of the aluminum-plated layer away from the base paper and dry to obtain the base oil layer; S3. Apply ink to the surface of the base oil layer away from the aluminum plating layer, and cure it under light to obtain the ink layer; S4. Apply varnish to the surface of the ink layer away from the base coat and cure under light to obtain the varnish layer; S5. Die-cut out the crease lines and glue the box to obtain the final product; the width of the crease lines is 1-1.1mm. The coating conditions for the base oil are: temperature 20-30℃, humidity 45-55%; The base oil comprises, by weight percentage, the following components Composition: 15-25% modified acrylic resin, 48-80% acrylic copolymer, 3-5% wax emulsion, 1-2% additives, and the balance of solvent; The modified acrylic resin is prepared from the following raw materials: acrylate emulsion, polyurethane emulsion, amino silicone oil, and ethanol solution of ethyl vanillin. The weight ratio of the ethanol solution of ethyl vanillin, amino silicone oil, and acrylate emulsion is (0.3-0.5):(0.2-0.25):

1. The concentration of the ethanol solution of the ethyl vanillin is 20wt%-40wt%.

2. The method for preparing the fold-resistant transfer silver cardboard box according to claim 1, characterized in that: The modified acrylic resin is prepared by: Polyurethane emulsion is added to acrylate emulsion, stirred and mixed, then an ethanol solution of ethyl vanillin and amino silicone oil are added, the mixture is heated and reacted to obtain the final product.

3. The method for preparing the fold-resistant transfer silver cardboard box according to claim 1, characterized in that: The base oil coating amount is 9-18 g / m 2 .

4. A silver cardboard box, characterized in that, It is prepared by the method for preparing the fold-resistant transfer silver cardboard box according to any one of claims 1-3.

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