Packaging box printing process

Abstract

The present invention relates to a packaging box printing process, comprising the steps of S1, pre-shaping paper; S2, laminating a middle layer; S3, re-shaping paper; S4, laminating wrapping paper; S5, printing and creasing; and S6, packaging. The purpose of the present invention is to heat-roller-press the paper of each discharge roller group twice through preheating cylinders a1 to a4 and a preheating cylinder group, so that the heat-set face paper and bottom paper are always bent toward the middle layer, and the two side surfaces of the laminating wrapping paper are parallel to each other, and the parallelism of each 100mm wrapping paper sample is no more than 0.04mm, thereby improving the flatness of the wrapping paper, ensuring that the subsequent printed pattern is flat, and the creasing print contour is accurately and clearly positioned, thereby improving the quality of the packaging box.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging box printing, in particular to a packaging box printing process. Background Art

[0002] Existing packaging boxes usually have patterned cardboard adhered to the surface of the box body by glue to achieve an aesthetic and promotional effect. The multi-layer wrapping paper used to make the packaging box requires each single layer of paper to be pressed together through high temperature, high pressure, gluing and other processes. At the same time, the two sides of the packaging paper must be parallel after pressing. If the parallelism of the two sides of the packaging box does not meet the standard, the pattern after spraying will be tilted and blurred, and the contour of the embossing line in the thin part of the packaging paper will be unclear, which will directly or indirectly affect the overall quality of the packaging box. Summary of the Invention

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the present invention is: a packaging box printing process, comprising the following steps:

[0004] S1. Paper pre-setting: The face paper, first lining paper, second lining paper and bottom paper in the four groups of discharge rollers are pre-set in the preheating cylinder, and the temperature of the preheating cylinder is preset to 120-158℃;

[0005] S2. Laminating the middle board: Corn starch glue is rolled onto the surface of the first lining paper by a glue brush roller b1, and the first and second lining papers are pressed together into the middle board by a pressing roller c1. The steam pressure of the glue brush roller b1 is preset to 7.2-7.5 kg.

[0006] S3. Paper shaping again: The face paper, middle board and bottom paper are shaped by the preheating cylinder group from top to bottom. The temperature of the preheating cylinder group is preset to 153-171℃, the wrap angle is preset to 24-97.7°, and the steam pressure is 6.3-7.88kg.

[0007] S4, Laminating the Wrapping Paper: Corn starch glue is rolled onto the face paper and the backing paper respectively by the glue brush rollers b2 and b3, and the face paper and the backing paper are pressed onto both sides of the middle board by the pressing roller group c2. After pressing, the wrapping paper is formed and passed through the dryer for drying. The wrapping paper output speed is 40 to 165 m / min.

[0008] S5. Printing and creasing: After the pattern is printed on the surface of the paper by a UV printer, it is rolled by a creasing machine to form a pre-fold line. The preset height of the creasing wheel is 800μm.

[0009] S6. Packaging: Cut into pieces by a cutting machine, stack into pieces by a stacking machine and pack into storage;

[0010] Furthermore, the preset values of the temperatures of the preheating cylinders corresponding to the face paper, first lining paper, second lining paper and bottom paper in the above S1 are 155°C, 151°C, 156°C and 158°C respectively;

[0011] Furthermore, the preheating temperature preset values of the preheating cylinder group in S3 from top to bottom are 153°C, 171°C, and 153°C, the wrap angle preset values are 95.5°, 24.2°, and 97.7°, and the steam pressures are 7.86kg, 7.88kg, and 7.79kg, respectively;

[0012] Furthermore, the corn starch glue is stirred and formed in a reactor, and the ambient temperature of the reactor is 60-65°, and is transferred to the glue brush rollers b1, b2, and b3 through a hydraulic pump.

[0013] Furthermore, the weight ratio of the corn starch glue is: 20-60 parts of corn starch, 1.8-6.5 parts of hydrogen peroxide, 1.5-4.2 parts of sodium hydroxide, 0.3-0.6 parts of borax, 0.02-0.2 parts of polyacrylamide, and the balance water.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The paper from each set of discharge rollers is shaped twice by hot roller pressing through preheating cylinders a1~a4 and the preheating cylinder group. After heat setting, the surface paper and bottom paper are always bent toward the middle layer board. The two sides of the pressed packaging paper are parallel to each other, and the parallelism of every 100mm packaging paper sample is no more than 0.04mm, which improves the flatness of the packaging paper, makes the subsequent printing pattern flat, and makes the embossing line and print contour positioning accurate and clear, thereby improving the quality of the packaging box.

[0016] The embodiments of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the process of pressing the face paper, the middle layer board, and the bottom paper into packaging paper in steps S1-S4 according to the present invention;

[0018] Figure 2 is a process flow chart of the present invention;

[0019] Figure 3 This is a control interface diagram of the preheating cylinders a1, a2, a3, a4 and the preheating cylinder group 4 of the present invention; DETAILED DESCRIPTION

[0020] like Figure 1-3 As shown, the present invention provides a first embodiment of a packaging box printing process, comprising the following steps:

[0021] S1. Paper pre-setting: The face paper 1, first lining paper 21, second lining paper 22 and bottom paper 3 in the four groups of discharge rollers are pre-set in the preheating cylinders. The preheating cylinders a1, a2, a3 and a4 corresponding to the face paper 1, first lining paper 21, second lining paper 22 and bottom paper 3 are set to 155°C, 150°C, 156°C and 158°C respectively.

[0022] S2. Laminating the middle board: Corn starch glue is rolled onto the surface of the first lining paper 21 by a glue brush roller b1. The first lining paper 21 and the second lining paper 22 are pressed together into the middle board 2 by a pressing roller c1. The steam pressure of the glue brush roller b1 is preset to 7.5 kg.

[0023] S3. Paper shaping again: The face paper 1, middle sheet 2 and bottom paper 3 are shaped in sequence through the preheating cylinder group 4 from top to bottom. The preheating temperatures of the preheating cylinder group 4 are preset to be 153°C, 171°C and 153°C respectively, the wrap angles are preset to be 95.5°, 24.2° and 97.7° respectively, and the steam pressures are preset to be 7.86kg, 7.88kg and 7.79kg respectively.

[0024] S4, laminating the wrapping paper: corn starch glue is rolled onto the face paper 1 and the bottom paper 3 by glue brush rollers b and c (62, 63), and the face paper 1 and the bottom paper 3 are pressed onto both sides of the middle board 2 by the pressing roller group c2. After lamination, the wrapping paper is formed and dried in a dryer. The drying temperature is 170°C and the wrapping paper output speed is 165m / min.

[0025] S5. Printing and creasing: After the pattern is printed on the surface of the face paper 1 by a UV printer, the creasing machine rolls the pattern to form a pre-folded line. The preset height of the creasing wheel is 800 μm.

[0026] S6. Packaging: Cut into pieces by a cutting machine, stack into pieces by a stacking machine and pack into storage;

[0027] The corn starch glue is prepared in the following weight ratios: 20 parts corn starch, 1.8 parts hydrogen peroxide, 1.5 parts sodium hydroxide, 0.3 parts borax, 0.02 parts polyacrylamide, and the balance water. The corn starch glue is stirred and formed in a reactor at an ambient temperature of 60°C. The glue is then transferred to the glue brush rollers b1, b2, and b3 via a hydraulic pump.

[0028] The present invention provides a second embodiment of a packaging box printing process, comprising the following steps:

[0029] S1. Paper pre-setting: The face paper 1, first lining paper 21, second lining paper 22 and bottom paper 3 of the four groups of discharge rollers 1 are pre-set in the preheating cylinders. The preheating cylinders a1, a2, a3 and a4 corresponding to the face paper 1, first lining paper 21, second lining paper 22 and bottom paper 3 are set to 120°C, 124°C, 123°C and 127°C respectively.

[0030] S2, pressing the middle board 2: Corn starch glue is rolled onto the surface of the first lining paper 21 by a glue brush roller b1, and the first and second lining papers 21, 22 are pressed together into the middle board 2 by a pressing roller c1. The preset steam pressure of the glue brush roller b1 is 7.2 kg.

[0031] S3. Paper shaping again: The face paper 1, middle sheet 2 and bottom paper 3 are shaped in sequence through the preheating cylinder group 4 from top to bottom. The preheating temperatures of the preheating cylinder group 4 are preset to be 153°C, 171°C and 153°C respectively, the wrap angles are preset to be 67.5°, 24° and 71° respectively, and the steam pressures are preset to be 6.41kg, 6.47kg and 6.3kg respectively.

[0032] S4, laminating the wrapping paper: corn starch glue is rolled onto the face paper 1 and the bottom paper 3 by glue brush rollers b and c (62, 63), and the face paper 1 and the bottom paper 3 are pressed onto both sides of the middle board 2 by the pressing roller group c2. After lamination, the wrapping paper is formed and dried in a dryer. The wrapping paper output speed is 40m / min.

[0033] S5. Printing and creasing: After the pattern is printed on the surface of the face paper 1 by a UV printer, the creasing machine rolls the pattern to form a pre-folded line. The preset height of the creasing wheel is 800 μm.

[0034] S6. Packaging: Cut into pieces by a cutting machine, stack into pieces by a stacking machine and pack into storage;

[0035] The corn starch glue is prepared in the following weight ratios: 60 parts corn starch, 6.5 parts hydrogen peroxide, 4.2 parts sodium hydroxide, 0.6 parts borax, 0.2 parts polyacrylamide, and the balance water. The corn starch glue is stirred and formed in a reactor at an ambient temperature of 65°C. The glue is then transferred to the glue brush rollers b1, b2, and b3 via a hydraulic pump.

[0036] In the present invention, after being pulled out from the discharge roller 1, the face paper 1, the first lining paper 21, the second lining paper 22 and the bottom paper 3 are respectively pre-shaped by hot roller pressing through preheating cylinders A, B, C and D, so as to facilitate subsequent transmission, gluing and pressing and forming. The face paper 1, the middle layer board 2 and the bottom paper 3 are again hot roller pressed and shaped by the preheating cylinder group 4 before pressing, so that the two side surfaces of the pressed packaging paper are parallel to each other, and the parallelism of each 100mm packaging paper sample is not greater than 0.04mm, thereby improving the flatness of the packaging paper, making the position of printing and folding lines more accurate, and improving the quality of the packaging box.

Claims

1. A packaging box printing process, characterized in that, The steps include: S1. Paper pre-setting: The face paper, first lining paper, second lining paper and bottom paper in the four groups of discharge rollers are pre-set in the preheating cylinder, and the temperature of the preheating cylinder is preset to 120-158℃; S2. Laminating the middle layer board: corn starch glue is rolled onto the surface of the first lining paper by a first glue brush roller (b1), and the first lining paper and the second lining paper are pressed into the middle layer board by a pressing roller (c1). The steam pressure of the first glue brush roller (b1) is preset to 7.2-7.5 kg. S3. Paper shaping again: The face paper, middle board and bottom paper are shaped by the preheating cylinder group from top to bottom. The temperature of the preheating cylinder group is preset to 153-171℃, the wrap angle is preset to 24-97.7°, and the steam pressure is 6.3-7.88kg. S4, laminating the wrapping paper: corn starch glue is rolled onto the face paper and the base paper respectively by a second glue brush roller (b2) and a third glue brush roller (b3), and the face paper and the base paper are pressed onto both sides of the middle board by a pressing roller group (c2). After lamination, the wrapping paper is formed and dried in a dryer. The wrapping paper is discharged at a speed of 40 to 165 m / min. S5. Printing and creasing: After the pattern is printed on the surface of the paper by a UV printer, it is rolled by a creasing machine to form a pre-fold line. The preset height of the creasing wheel is 800μm. S6. Packaging: Cut into pieces by a cutting machine, stack into pieces by a stacking machine and pack into storage; The weight ratio of the corn starch glue is: 20-60 parts of corn starch, 1.8-6.5 parts of hydrogen peroxide, 1.5-4.2 parts of sodium hydroxide, 0.3-0.6 parts of borax, 0.02-0.2 parts of polyacrylamide, and the balance is water.

2. A packaging box printing process according to claim 1, characterized in that: The preset values of the temperatures of the preheating cylinders corresponding to the face paper, first lining paper, second lining paper and bottom paper in the above S1 are 155° C., 151° C., 156° C. and 158° C. respectively.

3. The packaging box printing process according to claim 1, characterized in that: The preset values of preheating temperature of the preheating cylinder group in the above S3 from top to bottom are 153°C, 171°C, and 153°C respectively; the preset values of wrap angle are 95.5°, 24.2°, and 97.7° respectively; and the steam pressures are 7.86kg, 7.88kg, and 7.79kg respectively.

4. A packaging box printing process according to claim 1, characterized in that: The corn starch glue is stirred and formed in a reactor with an ambient temperature of 60-65° C., and is transferred to the first rubber brush roller (b1), the second rubber brush roller (b2), and the third rubber brush roller (b3) through a hydraulic pump.

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