Skin feeling effect printing method for cigarette case packaging paper

Abstract

The invention relates to the field of package printing, in particular to a skin feeling effect printing method for cigarette case packaging paper. The printing method comprises the following steps that in the same offset printing equipment, 1) UV base oil printing is firstly conducted on the surface, printed with patterns and / or characters, of the cigarette case packaging paper; (2) after the step (1), printing a skin-touch ink layer; skin-touch ink adopted in the skin-touch ink layer is prepared from the following raw material components in parts by weight: 10 to 30 parts of first polyurethane resin, 60 to 80 parts of acrylate copolymer, 1 to 5 parts of polydimethylsiloxane, 1 to 5 parts of polyethylene wax, 1 to 5 parts of triethylamine and 40 to 50 parts of solvent. The printing method is achieved through one-time printing, UV base oil printing is conducted firstly, the leveling effect is obtained, the production efficiency is improved, the requirement for pre-printing file processing and the degree of dependence on equipment are reduced, the proofing difficulty is reduced, the water resistance, binding strength and abrasion resistance of an ink layer are improved, and the printing method has wide market application prospects.

Description

Technical Field

[0001] The invention relates to the field of packaging printing, and in particular to a method for printing skin-feeling effect on packaging paper for cigarette boxes. Background Art

[0002] As a means of printing on the surface of paper products, tactile ink printing increases the three-dimensional sense and texture of printed products, increases the visual impact, and gives consumers a good tactile experience, thereby enhancing the added value of the product.

[0003] Tactile inks use the structure of polymer chain microphase separation produced by the polymerization reaction of water-based polyurethane to form a fluffy surface on the surface of paper products after coating. Traditional tactile inks use high coating amounts to increase the filling amount of polyurethane to compensate for the local unevenness and density of the microphase separation degree of the soft and hard segments of polyurethane, so that the surface of paper products can achieve a delicate and obvious velvety effect. Therefore, the tactile inks currently on the market use screen printing, gravure printing or online offset printing double flexographic glazing to print the surface of paper product packaging boxes. The additional screen or gravure printing process not only increases the cost of paper product packaging boxes, but also increases the difficulty of rapid proofing of products in the early stage; the double flexographic printing implementation method is dependent on the equipment function of the production line, and the product presentation effect is greatly affected by the registration accuracy. These implementation methods limit the use scenarios of tactile inks. At the same time, affected by the drying film-forming method and drying speed of water-based inks, the ink layer bonding strength of tactile inks is low, and the ink layer is prone to fall off. Inks with high solid content will cause poor leveling of the ink layer, affecting the appearance display effect of the product. Since the molecular chain structure of waterborne polyurethane contains a large number of hydrophilic groups, the material has poor hydrolysis resistance and is therefore not suitable for paper packaging boxes with display functions, especially gift boxes. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a skin-feel effect printing method for cigarette box packaging paper. The present invention uses the printing method to treat the surface of cigarette box packaging paper, realizes one-time offset printing, and improves the water resistance, wear resistance, smoothness and matte uniformity of the skin-feel ink layer. The ink effect is novel and is suitable for various paper packaging box products including gift boxes.

[0005] In order to achieve the above-mentioned object and other related objects, the first aspect of the present invention provides a method for printing a skin-feel effect on a cigarette box packaging paper, comprising the following steps:

[0006] 1) UV primer printing is first performed on the surface of the cigarette box wrapping paper which has been printed with patterns and / or texts;

[0007] 2) Printing a skin-feel ink layer; the skin-feel ink used in the skin-feel ink layer includes the following raw material components and weight parts:

[0008] 10 to 30 parts of the first polyurethane resin; for example, the weight of the first polyurethane resin is 10 to 15 parts, 15 to 20 parts, 20 to 25 parts or 25 to 30 parts;

[0009] 60 to 80 parts by weight of acrylic acid ester copolymer; if the weight of the acrylic acid ester copolymer is 60 to 65 parts, 65 to

[0010] 70 parts, 70-75 parts or 75-80 parts;

[0011] 1 to 5 parts of polydimethylsiloxane; if the weight of the polydimethylsiloxane is 1 to 2 parts, 2 to 3 parts, 3 to 4 parts or 3 to 5 parts;

[0012] 1 to 5 parts of polyethylene wax; if the weight of the polyethylene wax is 1 to 2 parts, 2 to 3 parts, 3 to 4 parts or 3 to 5 parts;

[0013] 1 to 5 parts of triethylamine; if the weight of triethylamine is 1 to 2 parts or 2 to 5 parts;

[0014] 40 to 50 parts of solvent, such as 40 to 45 parts or 45 to 50 parts by weight of the solvent.

[0015] Preferably, the solvent comprises an ethanol aqueous solution, and the volume concentration of the ethanol aqueous solution is 50% to 75%, such as the volume concentration of the ethanol aqueous solution can be 50%, 55%, 60%, 65%, 70%, 75%.

[0016] Preferably, the UV primer comprises the following raw material components:

[0017] The binder is 20-40wt%, such as 20-25wt%, 25-30wt%, 30-35wt%, 35-40wt%;

[0018] UV monomer 30-40wt%, such as 30-35wt%, 35-40wt%;

[0019] 10-20 wt% of diluent, such as 10-15 wt%, 15-20 wt%;

[0020] Initiator 5-8wt%, such as 5wt%, 6wt%, 7wt%, 8wt%;

[0021] 1-2 wt% of the auxiliary agent, such as 1 wt% or 2 wt%;

[0022] The filler content is 1-20wt%, such as 1-10wt%, 1-14wt%, 14-20wt%.

[0023] The UV primer will not react with the skin-feel ink, and the adhesion between the two is good. The UV primer isolates the surface of the paper packaging box from the ink layer, evens out the ink layer, and improves the leveling effect.

[0024] More preferably, the binder is a second polyurethane resin.

[0025] More preferably, the number average molecular weight of the second polyurethane resin is 10,000 to 100,000. For example, the number average molecular weight of the second polyurethane resin may be 10,000 to 30,000, 30,000 to 60,000, or 60,000 to 100,000.

[0026] More preferably, the UV monomer is epoxy acrylate.

[0027] More preferably, the diluent is trimethylolpropane triacrylate.

[0028] More preferably, the initiator is 2-methylbenzophenone.

[0029] More preferably, the auxiliary agent is dimethyl silicone oil, and the number average molecular weight is 460 to 600. For example, the number average molecular weight of the dimethyl silicone oil can be 460 to 480, 480 to 500, 500 to 520, 520 to 540, 540 to 560, 560 to 580, or 580 to 600.

[0030] More preferably, the filler is low-density polyethylene with a number average molecular weight of 5000 to 10000. For example, the number average molecular weight of the low-density polyethylene may be 5000 to 7000, 7000 to 9000, or 9000 to 10000.

[0031] Preferably, the number average molecular weight of the polydimethylsiloxane is 740-1200. For example, the number average molecular weight of the polydimethylsiloxane may be 740-940, 940-1100, or 1100-1200.

[0032] Preferably, the number average molecular weight of the polyethylene wax is 3000-8000. For example, the number average molecular weight of the polyethylene wax may be 3000-5000, 5000-7000, or 7000-8000.

[0033] Preferably, the first polyurethane resin is polyurethane with a CAS number of 9009-54-5.

[0034] More preferably, the acrylic copolymer is a copolymer of ethyl methacrylate and butyl acrylate, the weight average molecular weight of the copolymer is 45,000-55,000, such as 45,000-50,000 or 50,000-55,000; the molar ratio of ethyl methacrylate to butyl acrylate is 25:(2.5-3.5), such as 25:(2.5-3), 25:(3-3.2) or 25:(3.2-3.5).

[0035] More preferably, after step 1), the cigarette box packaging paper after UV primer printing is subjected to a first drying treatment; the first drying treatment includes irradiation with an ultraviolet curing lamp tube, and the power of the ultraviolet curing lamp tube is 8kw to 18kw. For example, the power of the ultraviolet curing lamp tube can be 8 to 12kw, 12 to 16kw, or 16 to 18kw.

[0036] Preferably, in the step 2), during the printing process of the skin-feel ink layer, it is necessary to avoid the area on the surface of the paper packaging box where no skin-feel effect printing is required.

[0037] Preferably, in step 2), the type of plate used for coating is a rubber blanket or a flexographic plate.

[0038] Preferably, in step 1), the coating amount of the base oil is 2 g / m 2 ~20g / m 2 The coating amount of the primer can be 2g / m 2 ~6g / m 2 , 6g / m 2 ~10g / m 2 , 10g / m 2 ~14g / m 2 , 14g / m 2 ~18g / m 2 , 18g / m 2 ~20g / m 2 .

[0039] Preferably, in step 2), the coating amount of the skin-feeling ink is 5.0 cm 3 / m 2 ~11.7cm 3 / m 2 The coating amount of the skin-feel ink can be 5.0 cm 3 / m 2 ~6.5cm 3 / m 2 、6.5cm 3 / m 2 ~8.0cm 3 / m 2 、8.0cm 3 / m2 ~9.5cm 3 / m 2 、9.5cm 3 / m 2 ~11.0cm 3 / m 2 、11.0cm 3 / m 2 ~11.7cm 3 / m 2 .

[0040] Preferably, the offset printing equipment adopts a Heidelberg CD102 printing press with a printing speed of 5000 sheets / hour to 11000 sheets / hour.

[0041] More preferably, the step 2) further includes a second drying treatment after printing the skin-feel ink layer, and the second drying treatment includes hot air drying and infrared lamp drying, by setting the hot air infrared drying unit of the offset printing machine, each drying unit includes 4 hot air fans and 6 infrared lamps, the power of the hot air fan is 330W, and the hot air drying power is turned on by 30% to 70%; the wavelength of the infrared lamp is 750nm to 1500nm, the power of each group of infrared lamps is 6.2KW, and the power of the infrared lamps is turned on by 30% to 50%.

[0042] The second aspect of the present invention discloses a cigarette box wrapping paper decorated with skin-feeling effect obtained by the printing method as described above.

[0043] The third aspect of the present invention discloses a cigarette packaging box using the above-mentioned packaging paper.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] (1) The printing method of the present invention is realized by printing with skin-feel effect ink once, thereby reducing an offline screen printing, flat-gravure printing or online offset printing glazing process, greatly reducing production costs and improving proofing and production efficiency.

[0046] (2) The surface of the paper packaging box after UV primer printing is smoother, and the surface functional groups are increased, making the ink smoother and improving the skin feel and the bonding strength between the ink and the packaging paper.

[0047] (3) After the printing method is used, the matte degree of the surface of the paper product packaging box is uniform, the bonding fastness is strong, the water resistance is good, and the wear resistance is good, which is more suitable for display gift boxes. The scope of application is wide and is not limited by the product packaging paper type and box type structure. Ordinary cardboard and coated paper can use this method to make the surface have a baby skin-like feel effect, and according to the appearance design of the packaging print, the skin-feel effect can be printed on the local position of the layout or the entire layout. After printing, the product safety requirements meet YQ 69 "Safety and Sanitation Requirements for Cigarette Strip and Box Packaging Paper", and can be used for surface printing of high-end cigarette products. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It shows a schematic diagram of the surface structure of a paper packaging box after printing with the skin-feel effect ink described in Example 1; wherein 1 is a skin-feel effect ink layer, 2 is a paper packaging box pattern and text printing ink layer, and 3 is packaging paper.

[0049] Figure 2 It shows a schematic diagram of the surface structure of a paper packaging box after printing with the skin-feel effect ink described in Comparative Example 1; wherein 1 is a skin-feel effect ink layer, 2 is a paper packaging box pattern and text printing ink layer, and 3 is packaging paper.

[0050] Figure 3 The graph shows the ink bonding fastness test results after printing with the skin-feel effect ink described in Example 2, Comparative Example 1, and Comparative Example 2.

[0051] Figure 4 Shown are the three-dimensional distribution diagram of the ink layer surface after printing with the skin-feel effect ink described in Example 1, Example 2, Comparative Example 1, and Comparative Example 2, as well as the Spc and Sz comparison diagrams.

[0052] Figure 5 Shown are the surface effects of the paper packaging boxes after printing in Example 2 and Comparative Example 2. DETAILED DESCRIPTION

[0053] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0054] In the following examples: parameters and their clear and repeatable test methods

[0055] The weight average molecular weight and number average molecular weight are measured in accordance with the provisions of GB / T 21863-2008.

[0056] Gloss (60°) is measured in accordance with the provisions of 6.7 in GB / T 7705-2008.

[0057] The wear resistance is measured in accordance with the provisions of 6.8 of GB / T 7705-2008. The test results are expressed as minimum values. The higher the measured value, the better the wear resistance of the coating.

[0058] The ink layer adhesion fastness is measured according to GB / T 13217.7 liquid ink adhesion fastness test method.

[0059] The water contact angle was measured using a DSA25 optical contact angle meter.

[0060] The ink layer distribution on the surface of the paper packaging box was tested using the KEYENCE 3D profile measuring instrument VR-6000.

[0061] The test method for testing the smoothness, i.e. the static friction coefficient, using the TMI friction coefficient tester is as follows:

[0062] a. Cut the sample into 6.5mm*6.5mm samples, place them with the printed side facing down at the starting position of the test arm.

[0063] b. Install the slider onto the test arm and place it completely on the sample, lower the anti-slip bar to engage the slider, and press <start>Start testing.

[0064] c. When the test arm stops moving and the screen displays "Remove sled Press[ENTER]", remove the sled and sample and press <enter>key, the test arm returns to the starting position.

[0065] d. The reading displayed on the screen is the "smoothness value" test data of the sample with 2 decimal places retained, and the final result is the average value of each sample.

[0066] The technical solution in the present application is implemented by offset printing on a Heidelberg CD102 model printer. The printing speed of the printer is 5000 sheets / hour to 11000 sheets / hour. The type of plate used for coating is a rubber blanket or a flexographic plate.

[0067] In order to illustrate the technical solution and technical effect of the present application, a specific 245g / m 2 Swedish white card (non-fluorescent) packaging paper and 250g / m 2 The platinum light column paper is used as an example for explanation.

[0068] Example 1

[0069] In this embodiment, 245g / m 2 Take Swedish white card (non-fluorescent) packaging paper as an example.

[0070] The method for printing the skin-feel effect of cigarette box packaging paper in this embodiment comprises the following steps:

[0071] (1) Printing patterns and texts on the surface of a paper packaging box using the printing machine, and drying the printed paper packaging box;

[0072] (2) UV primer printing is first performed on the surface of the cigarette box wrapping paper on which patterns and / or texts have been printed using the printing machine, and the UV primer coating amount is 10 g / m 2 , and then perform the first drying treatment: irradiate with a 12kw UV curing lamp;

[0073] (3) The printing press is used to print skin-effect ink on packaging paper after UV primer printing. The plate used during printing is a flexible plate. The glazing circulation ink supply system of the printing press is used to avoid ink condensation and precipitation. The trapping value between the skin-feel area and the UV light and the concave-convex pattern is 0.03 mm, and the ink coating amount is 11.0 cm 3 / m 2 .

[0074] (4) After the skin-feel effect ink is printed, a second drying process is performed: hot air drying and infrared lamp drying are performed, the hot air is fully turned on, the wavelength of the infrared lamp is 1500nm, the power of each group of infrared lamps is 6.2KW, the power of the infrared lamps is turned on 50%, and the printing speed is 9000 sheets / hour;

[0075] (5) The printed packaging paper is subjected to post-processing such as hot stamping, screen printing, embossing and die-cutting.

[0076] The skin-feel effect ink comprises the following raw material components and weight portions: 20 parts of the first polyurethane resin, 70 parts of acrylate copolymer, 4 parts of polydimethylsiloxane, 4 parts of polyethylene wax, 2 parts of triethylamine, and 45 parts of ethanol solution with a volume concentration of 50%. Among them, the first polyurethane resin is polyurethane, with a CAS number of 9009-54-5; the number average molecular weight of the polydimethylsiloxane is 940; the number average molecular weight of the polyethylene wax is 5000; the acrylate copolymer is a copolymer of ethyl methacrylate and butyl acrylate, with a weight average molecular weight of 50,000; and the molar ratio of ethyl methacrylate to butyl acrylate is 25:3.

[0077] The UV primer comprises the following raw material components and weight parts: 30wt% of a binder, 30wt% of a UV monomer, 20wt% of a diluent, 5wt% of an initiator, 1wt% of an auxiliary agent, and 14wt% of a filler. The binder is a second polyurethane resin with a number average molecular weight of 60,000; the UV monomer is epoxy acrylate; the diluent is trimethylolpropane triacrylate; the initiator is 2-methylbenzophenone; the auxiliary agent is dimethyl silicone oil with a number average molecular weight of 540; and the filler is low-density polyethylene with a number average molecular weight of 7,000.

[0078] The surface structure of the cigarette box wrapping paper obtained in this embodiment is as follows Figure 1 As shown, the surface of the packaging box can have a matte gloss effect.

[0079] Example 2

[0080] The printing method in this embodiment is different from that in embodiment 1 in that the packaging paper is 250g / m 2 Platinum light column paper.

[0081] Example 3

[0082] The printing method described in this embodiment is different from that in Embodiment 2 in that the weight parts of the first polyurethane resin are 30 parts, and the weight parts of the acrylic ester copolymer are 60 parts.

[0083] Example 4

[0084] The printing method described in this embodiment is different from that in Embodiment 2 in that the weight portion of the polydimethylsiloxane is 2 parts and the weight portion of the polyethylene wax is 2 parts.

[0085] Example 5

[0086] The printing method described in this embodiment is different from that in embodiment 2 in that the coating amount of the UV primer is 6 g / m 2 .

[0087] Comparative Example 1

[0088] The printing method in this comparative example is different from that in Example 2 in that the weight parts of the first polyurethane resin are 70 parts and the weight parts of the acrylic ester copolymer are 20 parts.

[0089] Comparative Example 2

[0090] The printing method described in this comparative example is different from that in Example 2 in that the operation of step (2) is omitted.

[0091] Comparative Example 3

[0092] The printing method described in this comparative example is different from that in Example 2 in that the operations of step (2) and step (3) are omitted.

[0093] The test results show that:

[0094] 1) Measured in accordance with the provisions of 6.7 of GB / T 7705-2008:

[0095] The glossiness (60°) of the packaging paper surface after the printing method of Example 1 was 1.2%;

[0096] The glossiness (60°) of the packaging paper surface after the printing method of Example 2 was 1.3%;

[0097] The glossiness (60°) of the packaging paper surface after the printing method of Example 3 was 1.4%;

[0098] The glossiness (60°) of the packaging paper surface after the printing method of Example 4 was 1.5%;

[0099] The glossiness (60°) of the packaging paper surface after the printing method of Example 5 was 1.5%;

[0100] The glossiness (60°) of the packaging paper surface after the printing method of comparative example 1 was 2.1%;

[0101] The glossiness (60°) of the packaging paper surface after the printing method of comparative example 2 was 2.9%;

[0102] The glossiness (60°) of the packaging paper surface after being processed by the printing method of Comparative Example 3 is 3.2%.

[0103] It can be seen that the packaging papers obtained using Examples 1 to 5 of the printing method described in the present application have a better matte effect than the packaging papers obtained by Comparative Example 1 printed using other inks, Comparative Example 2 printed without using UV primer, and Comparative Example 3 printed without using UV primer and skin-effect ink.

[0104] 2) Measured in accordance with the provisions of 6.8 of GB / T 7705-2008:

[0105] The wear resistance of the paper packaging box surface after the printing method of Example 1 is 96.2%;

[0106] The wear resistance of the paper packaging box surface after the printing method of Example 2 is 97.6%;

[0107] The wear resistance of the paper packaging box surface after the printing method of Example 3 is 96.6%;

[0108] The wear resistance of the paper packaging box surface after the printing method of Example 4 is 95.8%;

[0109] The wear resistance of the paper packaging box surface after the printing method of Example 5 is 94.6%;

[0110] The wear resistance of the paper packaging box surface after the printing method of comparative example 1 is 92.6%;

[0111] The wear resistance of the surface of the paper packaging box after being processed by the printing method of Comparative Example 2 is 77.7%.

[0112] It can be seen that the wrapping paper obtained using Examples 1 to 5 of the printing method described in the present application has significantly improved wear resistance compared to the wrapping paper obtained in Comparative Example 1 printed using other inks, Comparative Example 2 printed without using UV primer, and Comparative Example 3 printed without using UV primer and skin-effect ink.

[0113] In addition, also using the printing method described in the present application, the wear resistance of the packaging paper obtained in Example 5 with a smaller amount of UV primer is significantly lower than that in Example 2.

[0114] 3) Measured according to GB / T 13217.7 liquid ink adhesion fastness test method: Figure 3 As shown, a) is the test result of the ink layer bonding fastness on the surface of the packaging paper after the printing method of Example 2, and part of the skin-feel effect ink layer is stuck where the 3M tape is pasted; b) is the test result of the ink layer bonding fastness on the surface of the packaging paper after the printing method of Comparative Example 1, and almost all of the skin-feel effect ink layer is stuck where the 3M tape is pasted; c) is the test result of the ink layer bonding fastness on the surface of the packaging paper after the printing method of Comparative Example 2, and almost all of the skin-feel modification ink layer and the bottom color ink are stuck where the 3M tape is pasted.

[0115] 4) Use KEYENCE 3D profile measuring instrument VR-6000 to observe the laser image of the ink layer distribution on the packaging paper surface: Figure 4 As shown in the figure, by comparing the three-dimensional distribution of the skin-feel ink droplets on the surface of the two samples, the arithmetic mean curvature Spc value (relative value) representing the peak vertex and the maximum surface height Sz (relative value) are obtained. The Spc value represents the sharpness of the peak. The larger the value, the sharper the vertex and the stronger the touch of the ink layer. The Sz value represents the height from the deepest valley to the highest peak. The larger the value, the thicker the ink layer. It can be explained that the uniformity of the ink layer distribution under the same ink application amount:

[0116] As shown in the figure,

[0117] a) is the distribution of the 3D ink layer on the surface of the packaging paper after being processed by the printing method of Example 1;

[0118] b) is the distribution of the 3D ink layer on the surface of the packaging paper after being processed by the printing method of Example 2;

[0119] c) is the distribution of the 3D ink layer on the surface of the packaging paper after being processed by the printing method of Example 5;

[0120] d) is the distribution of the 3D ink layer on the surface of the packaging paper after the printing method of Comparative Example 2;

[0121] e) is a comparison chart of the Spc values ​​of Example 2 and Comparative Example 2; the right side is the Spc peak of Example 2, and the left side is the Spc peak of Comparative Example 2;

[0122] f) is a comparison chart of the Sz values ​​of Example 2 and Comparative Example 2, with the Sz peak of Example 2 on the left and the Sz peak of Comparative Example 2 on the right;

[0123] g) is a comparison chart of the Spc values ​​of Example 1 and Example 5, with the Spc peak of Example 1 on the right and the Spc peak of Example 5 on the left;

[0124] h) is a comparison chart of the Sz values ​​of Example 1 and Example 5, with the Sz peak of Example 1 on the right and the Sz peak of Example 5 on the left.

[0125] Through analysis, it can be seen that the surface touch of the packaging paper obtained in Example 2 is stronger than that of the packaging paper obtained in Comparative Example 2 which is not printed with UV primer, and the distribution of the skin-feel ink layer is more uniform; the surface touch of the packaging paper obtained in Example 1 is stronger than that of the packaging paper obtained in Example 5, and since the amount of primer in Example 5 is reduced, the transfer amount of the skin-feel ink layer is affected, the transfer rate of the ink is reduced, and the thickness of the ink layer is thinner.

[0126] 5) Measured using TMI friction coefficient tester:

[0127] The smoothness of the surface of the paper packaging box after the printing method of Example 1 is 0.121;

[0128] The smoothness of the surface of the paper packaging box after the printing method of Example 2 is 0.157;

[0129] The smoothness of the surface of the paper packaging box after the printing method of Example 5 is 0.166;

[0130] The smoothness of the surface of the paper packaging box after the printing method of comparative example 1 is 0.239;

[0131] The smoothness of the surface of the paper packaging box after the printing method of comparative example 2 is 0.345;

[0132] The smoothness of the surface of the paper packaging box after the printing method of comparative example 3 is 0.245;

[0133] It can be seen that the packaging papers obtained by using Examples 1, 2, and 5 of the printing method of the present application have better smoothness and smaller surface resistance than the packaging papers obtained by Comparative Example 1 and Comparative Examples 2 and 3 without UV primer printing.

[0134] 6) Using a DSA25 optical contact angle measuring instrument, it was measured that the water contact angle of the paper packaging box surface after the printing method of Example 2 was 94.09°; the water contact angle of the paper packaging box surface after the printing method of Comparative Example 2 was 83.27°.

[0135] Comparative Example 3: The water contact angle of the paper packaging box surface after printing is 84.64°.

[0136] It can be seen that the packaging paper obtained by using Example 2 of the printing method of the present application has better water resistance than the packaging paper not printed with UV primer and skin-effect ink.

[0137] 7) If Figure 5 As shown, a) is a skin feeling effect diagram of the printing method of Example 2, and b) is a skin feeling effect diagram of the printing method of Comparative Example 2. Figure 5 As shown in b), the skin-feel ink layer without pre-priming treatment has relatively dense light-colored small dots, indicating that the ink has poor leveling properties, resulting in uneven distribution on the surface of the packaging paper, which in turn affects the matte effect of the skin-feel ink layer. Figure 5 As shown in a), the skin-feel ink layer used after pre-priming has a more uniform coverage without uneven matte appearance.

[0138] 8) Figure 1 Schematic diagram of the ink layer structure of the skin-feel effect ink in Example 1; Figure 2 This is a schematic diagram of the ink layer structure of the ink in Comparative Example 1. Figure 1 and Figure 2 3 is the packaging paper, 2 is the ink layer for printing patterns and texts on the paper packaging box, and 1 is the skin-feel effect ink layer. According to the figure, after the skin-feel effect ink used in the printing method of the present application is cured, the compatibility of the soft and hard segments of the polyurethane is better than that of the ink in the prior art, and better ink layer bonding fastness and leveling can be obtained.

[0139] Comparison of the test results of the above-mentioned embodiment and the comparative example shows that the smoothness, water resistance, leveling and abrasion resistance of the surface of the packaging paper after being processed by the skin-feel effect printing method for cigarette box packaging paper protected by the present application are better, the bonding fastness is higher, and the skin-feel effect is better. In addition, the amount of UV primer applied in the printing method described in the present application will also affect the presentation of the skin-feel effect. When the amount of UV primer applied is small, the smoothness, water resistance, leveling, abrasion resistance, bonding fastness and skin-feel effect of the surface of the packaging paper obtained by the printing method described in the present application will all decrease.

[0140] In summary, the printing method disclosed in the present invention has simple steps, reduces an offline screen, flat-concave printing or online offset printing glazing process, greatly reduces production costs, and improves the efficiency of proofing and production; after the printing method is processed, the surface of the paper packaging box has lower smoothness, more uniform matte effect and better wear resistance, higher bonding fastness, and a wide range of applications, and is not limited by the product packaging paper type and box type structure. Therefore, the skin-feeling effect printing method described in the present invention has good application prospects in the printing field of paper product packaging boxes.

[0141] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.< / enter> < / start>

Claims

1. A method for printing a skin-feel effect on cigarette box packaging paper, characterized in that: The following steps are involved: In the same offset printing equipment, 1) UV primer printing is first performed on the surface of the cigarette box wrapping paper which has been printed with patterns and / or texts; 2) Printing a skin-feel ink layer; the skin-feel ink used in the skin-feel ink layer includes the following raw material components and weight parts:

2. The printing method according to claim 1, characterized in that: The solvent includes an ethanol aqueous solution, and the volume concentration of the ethanol aqueous solution is 50% to 75%.

3. The printing method according to claim 1, characterized in that: The UV primer comprises the following raw material components: 20-40 wt % of a binder, 30-40 wt % of a UV monomer, 10-20 wt % of a diluent, 5-8 wt % of an initiator, 1-2 wt % of an auxiliary agent, and 1-20 wt % of a filler.

4. The printing method according to claim 3, characterized in that: Also includes at least one of the following technical features: a) the binder is a second polyurethane resin having a number average molecular weight of 10,000 to 100,000; b) the UV monomer is epoxy acrylate; c) the diluent is trimethylolpropane triacrylate; d) the initiator is 2-methylbenzophenone; e) The auxiliary agent is dimethyl silicone oil with a number average molecular weight of 460 to 600; f) The filler is low-density polyethylene with a number average molecular weight of 5000 to 10000.

5. The printing method according to claim 1, characterized in that: The first polyurethane resin is polyurethane; and / or the acrylic ester copolymer is a copolymer of ethyl methacrylate and butyl acrylate, with a weight average molecular weight of 45,000 to 55,000, and a feeding molar ratio of ethyl methacrylate to butyl acrylate of 25:(2.5 to 3.5).

6. The printing method according to claim 1, characterized in that: The polydimethylsiloxane has a number average molecular weight of 740 to 1200; and / or the polyethylene has a number average molecular weight of 3000 to 8000.

7. The printing method according to claim 1, characterized in that: The coating amount of the base oil is 2g / m 2 ~20g / m 2 .

8. The printing method according to claim 1, characterized in that: The coating amount of the skin-feel ink is 5.0 cm 3 / m 2 ~11.7cm 3 / m 2 ; and / or, the offset printing equipment adopts a Heidelberg CD102 model printing press.

9. A cigarette box wrapping paper decorated with skin-feeling effect obtained by the printing method according to any one of claims 1 to 8.

10. A cigarette package box using the wrapping paper according to claim 9.

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