A waterproof carton processing technology

Abstract

The present invention discloses a waterproof carton processing technology, comprising the following steps: step 1: producing corrugated cardboard; step 2: making a pre-printed flexible plate and a flexible wax plate, and mixing ink and wax liquid; step 3: inspecting materials to ensure that the materials are qualified; step 4: pre-printing the corrugated cardboard in full; step 5: overprinting the corrugated cardboard, overprinting the required color according to the requirements; step 6: inspecting the overprinted corrugated cardboard; step 7: waxing the flexible wax plate; step 8: inspecting the waxed corrugated cardboard; step 9: die-cutting the corrugated cardboard; step 10: forming a carton of the die-cut corrugated cardboard. The waterproof carton processing technology is simple to manufacture, has a short production process time, stable quality, and high efficiency. The manufactured carton has high waterproof performance. By using this processing technology, the waterproof effect of the carton is effectively improved, the processing cost of the carton is reduced, the quality of the carton is improved, and the service life of the carton is extended.

Description

Technical Field

[0001] The invention relates to the technical field of carton processing, in particular to a waterproof carton processing technology. Background Art

[0002] With the personalized needs in the field of packaging applications and the requirements for specialized product packaging, a carton with waterproof and moisture-proof functions is needed to meet the current status of the industry. Therefore, waterproof cartons came into being. The traditional waterproof carton processing technology is mainly achieved through lamination, coating / spraying waterproof oil or varnish. According to comprehensive market feedback, the waterproof carton effect of traditional technology is not ideal. The water absorption rate is high, and the collapse of the carton and damage to the items often occur. At the same time, the processing technology is relatively cumbersome and needs to be equipped with special auxiliary equipment to complete. What's more, it cannot meet environmental protection requirements and cannot fundamentally solve the problem of carton waterproofing. The main processes and problems faced by waterproof cartons at present are:

[0003] The first waterproof carton with laminating process: the process uses a laminating machine, usually heated to about 100 degrees, maintained at a pressure of about 15 bar, and combines the plastic film with the surface sheet at a speed of 20 to 30 meters per minute. The plastic film on its surface is extremely expensive to handle during secondary recycling and cannot be completely recycled. With the global trend of advocating a plastic ban, it is necessary to seek alternative solutions to solve this problem. Moreover, corrugated cardboard cannot be laminated on both the front and back sides at the same time, and is often only surface treated. For certain areas with high moisture and humidity, such as fresh food and cold chain, higher requirements are placed on the waterproofness of the interior of the carton. Even if laminating is possible, it is easy to cause scratches on the film surface, generate air, increase humidity, and lose the waterproof effect. If the first-level factory is required to wax the base paper and the second-level factory is required to make corrugated cardboard, the width must be limited to a sufficient number of meters. In addition, pre-waxing and subsequent printing are required, and the surface cannot be printed, which has poor flexibility. In addition, the added supporting equipment and the increase in steps lengthen the process, and there are many overall disadvantages.

[0004] The second is waterproof cartons with waterproof oil or roller waxing process: Water-oiled cartons use special equipment to spray waterproof oil. Due to the limitations of the spraying equipment, it can basically only be used to treat the surface of the sheet. It is difficult to achieve oiling on the front and back of the corrugated cardboard, and the waterproof effect is minimal. Of course, there is also the original roller waxing method, which heats the solid paraffin to about 90 degrees to make it liquid, and uses manual roller brushes or modified simple equipment to wax. This method is difficult to control the wax layer, the thickness is uneven, and the wax layer is difficult to dry quickly. It requires a wide space for drying and is completed by a large number of manual labor. It cannot achieve assembly line operation and is extremely inefficient. Due to limited efficiency and production capacity, it is impossible to achieve high efficiency and mass production, and it is more difficult to popularize and promote its application.

[0005] In the face of deficiencies such as those mentioned above, it is necessary to make breakthrough innovations in the waterproof carton process. To this end, an emerging flexible wax plate process technology is adopted to fundamentally solve the deficiencies of the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems and to design a waterproof carton processing technology.

[0007] The technical solution of the present invention to achieve the above-mentioned purpose is a waterproof carton processing process, comprising the following steps:

[0008] Step 1: Produce corrugated cardboard;

[0009] Step 2: Prepare pre-printed flexographic plates and flexible wax plates, and mix ink and wax liquid;

[0010] Step 3: Material inspection to ensure that the materials are qualified;

[0011] Step 4: Full pre-printing of corrugated cardboard;

[0012] Step 5: Overprint the corrugated cardboard and overprint the required color according to the requirements;

[0013] Step 6: Inspect the overprinted corrugated cardboard;

[0014] Step 7: Apply wax to the flexible wax board;

[0015] Step 8: Inspect the waxed corrugated cardboard;

[0016] Step 9: Die-cut the wax-coated corrugated cardboard;

[0017] Step 10: Forming the die-cut corrugated cardboard box.

[0018] As a further description of the present technical solution, in the step one, the inner paper is selected, the face paper is 230-280 grams, the paper grade is AA or above, and the corrugated paper is 130-190 grams; the moisture content is maintained at 8%-10%, the cardboard cannot be visually bent or twisted, and there must be no tangible bumps on the surface. The paper layer cannot bubble or debond. From the base paper to the corrugated cardboard forming and the production of finished products, the moisture content needs to be kept stable throughout the entire process. When the turnover and semi-finished products flow through various sections, they need to be placed on the pallet and wrapped with stretch film, and flow with the pallet throughout the process.

[0019] As a further description of this technical solution, in step 2, the flexible wax plate uses DuPont DRC 6-7.0mm thick, 37-42 Shore A hardness material, and uses the ESKO system 110-line micro-cell process, with a cell diameter of 0.05-0.08mm and a cell depth of 0.13-0.17mm. Another flexible plate uses the same material to produce a full version.

[0020] As a further description of the present technical solution, in the step 2, the ink is a water-based ink, the color number of the ink is a PANTONE color number, it is made of acrylic acid and organic pigments, the glossiness of the water-based ink is 20-30GS, the quick-drying time is 8-12 seconds, and the viscosity is 15-20mPa·s. The wax liquid is made of solid paraffin, diluent, and emulsifier in a certain proportion. The stirring time of the wax liquid is 1 hour, the cooling time is 12 hours, and it is filtered through a 250-mesh filter. The viscosity is 12S~15mPa·s.

[0021] As a further description of this technical solution, in step three, the pre-printed flexographic plate, flexible wax plate, and the configured ink and wax liquid are inspected to ensure the quality of the materials. In step four, the flexible full plate is used to pre-treat the surface of the corrugated cardboard to achieve a better wax coating effect.

[0022] As a further description of the present technical solution, in the step five, the corrugated cardboard with printing content requirements is overprinted, and in the step six, the quality of the printed pattern on the overprinted corrugated cardboard is inspected to ensure the printing pass rate.

[0023] As a further description of the present technical solution, in step seven, a printing device is used, the micro-cell flexographic plate is placed in the first group, the flexible full plate is placed in the second group, and the wax liquid is coated on the surface of the corrugated cardboard.

[0024] As a further description of the present technical solution, in step eight, the wax-coated corrugated cardboard is subjected to waterproof, humidity and pressure resistance tests, and the next step is performed after the test is passed.

[0025] As a further description of the present technical solution, in step nine, a die-cutting machine is used to cut the corrugated cardboard according to the processing size requirements of the carton.

[0026] As a further description of the present technical solution, in step ten, the die-cut corrugated cardboard is glued or stapled to complete the production of the carton.

[0027] The beneficial effect is that the waterproof carton processing technology provided by this technical solution is simple to manufacture, with short production process time, stable quality, high efficiency, strong practicality, wide application and high popularity. The produced carton has high waterproof performance. The use of this processing technology effectively improves the waterproof effect of the carton, reduces the processing cost of the carton, and also improves the quality of the carton and extends the service life of the carton. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below. A waterproof carton processing process is characterized by comprising the following steps:

[0029] Step 1: producing corrugated cardboard; in said step 1, selecting the inner paper, the face paper is 230-280 grams, the paper grade is AA or above, and the corrugated paper is 130-190 grams; the moisture content is maintained at 8%-10%, the cardboard cannot be visually bent or twisted, the surface cannot have tangible bumps and spots, the paper layer cannot bubble or debond, and the moisture content needs to be kept stable throughout the process from base paper to corrugated cardboard forming and manufacturing finished products. When the turnover and semi-finished products flow through various sections, they need to be placed on the pallet and wrapped with stretch film, and flow with the pallet throughout the process.

[0030] Step 2: Prepare a pre-printed flexographic plate and a flexible wax plate, and mix ink and wax liquid. In step 2, the flexible wax plate is made of DuPont DRC 6-7.0 mm thick and 37-42 Shore A hardness material, and uses the ESKO system 110-line micro-cell process with a cell diameter of 0.05-0.08 mm and a cell depth of 0.13-0.17 mm. Another flexographic plate is made of the same material to produce a full version. The ink is a water-based ink with a PANTONE color number, made of acrylic acid and organic pigments. The gloss of the water-based ink is 20-30 GS, the quick drying time is 8-12 seconds, and the viscosity is 15-20 mPa·s. The wax liquid is made of solid paraffin, a diluent, and an emulsifier in a certain proportion. The stirring time of the wax liquid is 1 hour, the cooling time is 12 hours, and it is filtered through a 250-mesh filter. The viscosity is 12-15 mPa·s.

[0031] Step 3: Material inspection to ensure that the materials are qualified; in step 3, the pre-printed flexographic plate, flexible wax plate, and the configured ink and wax liquid are inspected to ensure the qualification of the materials.

[0032] Step 4: Full-plate pre-printing is performed on the corrugated cardboard; in said step 4, the flexible full-plate pre-treats the surface of the corrugated cardboard to achieve a better wax coating effect.

[0033] Step 5: Overprint the corrugated cardboard. Overprint the required color according to the requirements. In the step 5, overprint the corrugated cardboard with printing content requirements.

[0034] Step 6: Inspecting the overprinted corrugated cardboard; in step 6, the overprinted corrugated cardboard is inspected for the quality of the printed pattern to ensure the qualified rate of printing.

[0035] Step seven: applying wax to the flexible wax plate; in said step seven, a printing device is used, the micro-cell flexographic plate is placed in the first group, the flexible full plate is placed in the second group, and the wax liquid is applied to the surface of the corrugated cardboard.

[0036] Step eight: inspecting the waxed corrugated cardboard; in said step eight, performing waterproof, humidity and pressure resistance tests on the waxed corrugated cardboard, and proceeding to the next step after the test is passed.

[0037] Step nine: performing die-cutting operation on the corrugated cardboard; in said step nine, a die-cutting machine is used to cut the corrugated cardboard according to the processing size requirements of the carton.

[0038] Step 10: Carton forming operation of the die-cut corrugated cardboard. In said step 10, the die-cut corrugated cardboard is glued or stapled to complete the production of the carton.

[0039] The following will be specifically described in conjunction with the embodiments:

[0040] Example 1: Small batch production of 500 PCS, corrugated cardboard is B flute, material weight is 230 / 130 / 230, material specification is 900*1310mm, flexible full version uses DuPont TDR A pre-printed flexographic plate is made of a material with a thickness of 7.0mm and a hardness of 42 Shore A. The flexible wax plate uses DuPont DRC 7.0mm thickness and a hardness of 40 Shore A. The ESKO system 110-line micro-mesh process is used to make a mesh flexographic plate and a full-plate flexible wax plate. The ink is formulated using standard PANTON color number 446U, 22% acrylic acid, 15% organic pigment, 62% water, glossiness of 25GS, quick drying speed of 10 seconds, and viscosity of 17mPa·s. The liquid wax is formulated with 62% paraffin, 31% solvent, 7% emulsifier, temperature setting of 83°C, stirring time of one hour, cooling time of 12 hours, filtered with a 250-mesh filter, viscosity of 13mPa·s. After inspection, all materials fully meet the standard requirements. The equipment selected is an ink-based printing press with adjustable upper and lower pressure accuracy, speed regulation, and automatic leading edge paper feeding. The first set of anilox rollers is 150 mesh, the second group of anilox rollers is 180 mesh two-color printing machine, using sheet feeding, speed set to 80 sheets / minute, pressure to complete the front and back pre-printing without indentation on the cardboard surface and printing without leakage, overprint white text pattern on the full version of the front, followed by wax coating operation, micro-mesh flexo and full version wax version are used at the same time, the first group puts the micro-mesh flexo, the upper pressure is set to 1bar, the lower pressure is 1.5bar, the second group puts the full version wax version, the upper pressure is set to 1bar, the lower pressure is 1.2bar, the speed is 85 sheets / minute, continuous sheet feeding, the amount of wax liquid added to the wax supply system does not exceed 1 / 3, complete the wax coating process inside, after inspection of appearance, the qualified rate is 98%, samples are taken for water splashing test, the water drop rolling rate is 100%, the finished product is subjected to humidity test, waste paper scraps containing 100% water are packed into boxes and divided into boxes, and a 40KG weight is continuously pressurized for 48 hours without damage.

[0041] Example 2: Batch production of 32,400 PCS. The corrugated cardboard is EB flute with a material weight of 250 / 130 / 170 / 130 / 230 and a material size of 890*1290 mm. Two pre-printed flexographic plates are made of DuPont TDR with a thickness of 7.0 mm and a hardness of 42 ShA for the flexible full-plate. The flexible wax plate is made of DuPont DRC with a thickness of 7.0 mm and a hardness of 40 ShA. One cell flexographic plate and one full-plate flexible wax plate are made using an ESKO system 110-line micro-cell process. The ink is formulated using standard PANTON color 446U, 22% acrylic acid, 15% organic pigment, 62% water, with a gloss of 25GS, a quick drying speed of 10 seconds, and a viscosity of 17 mPa·s. The liquid wax is formulated with paraffin wax accounting for 62%, solvent accounting for 31%, and emulsifier accounting for 7%. The temperature is set at 83°C, the stirring time is one hour, the cooling time is 12 hours, and the wax is filtered through a 250-mesh filter. The viscosity is 13 mPa·s.

[0042] All materials were found to be in full compliance with the standard requirements. The equipment used was a two-color, front-edge-feeding water-based printing press with adjustable upper and lower pressure accuracy, speed regulation, and automatic front-edge paper feeding. The first set of anilox rollers had a 150-mesh design, while the second set had a 180-mesh design. The press employed continuous sheet feeding and a speed of 85 sheets per minute. The pressure was such that there were no indentations on the cardboard surface and no underprinting. White text and patterns were overprinted on the full-print front, followed by wax application. Both micro-cell flexographic plates and full-print wax plates were used simultaneously. The micro-cell flexographic plate was placed in the first set, with the upper pressure set to 1 bar and the lower pressure to 1. 5bar, the second group is filled with wax plates, the upper pressure is set to 1bar, the lower pressure is 1.2bar, the speed is 85 sheets / minute, continuous paper feeding, the amount of wax liquid added to the wax supply system does not exceed 1 / 3, and the wax coating process inside is completed; after random inspection of appearance, the qualified rate is 99%, and samples are taken for water splashing test, the water drop rolling rate is 100%, and the finished product is tested for humidity, and waste paper scraps containing 100% water are put into the box for classification, and a weight of 40KG is continuously pressurized for 48 hours without damage. The tested moisture content is 10%, which meets the moisture content standard (the industry or national standard is 10%±3).

[0043] The waterproof carton processing technology provided by this technical solution is simple to manufacture, with short production process time, stable quality, high efficiency, strong practicality, wide application and high popularity. The produced carton has a uniform wax layer, and the wax liquid penetrates into the paper layer and the surface layer to form a wax film, and has high waterproof performance. The use of this processing technology effectively improves the waterproof effect of the carton, reduces the processing cost of the carton, and also improves the quality of the carton and extends the service life of the carton.

[0044] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A waterproof carton processing technology, characterized in that: The steps include: Step 1: Produce corrugated cardboard; Step 2: Prepare pre-printed flexographic plates and flexible wax plates, and mix ink and wax liquid; Step 3: Material inspection to ensure that the materials are qualified; Step 4: Full pre-printing of corrugated cardboard; Step 5: Overprint the corrugated cardboard and overprint the required color according to the requirements; Step 6: Inspect the overprinted corrugated cardboard; Step 7: Apply wax to the flexible wax board; Step 8: Inspect the waxed corrugated cardboard; Step 9: Die-cut the wax-coated corrugated cardboard; Step 10: Forming the die-cut corrugated cardboard box; In the step 1, the lining paper and the face paper are selected to be 230-280 g / m2, the paper grade is AA or above, and the corrugated paper is 130-190 g / m2; the moisture content is maintained at 8%-10%, the cardboard should not be visually bent or twisted, the surface should not have any tangible concave or convex points, and the paper layer should not be bubbling or debonding. From the base paper to the corrugated cardboard forming and the production of the finished product, the moisture content needs to be kept stable throughout the entire process. When the semi-finished product is placed on the pallet and wrapped with stretch film during the turnover and circulation of each section, it needs to flow with the pallet throughout the process; In the second step, the flexible wax plate is made of a material with a thickness of 6 to 7.0 mm and a hardness of 37 to 42 A, and a 110-line micro-cell process is used, with a cell diameter of 0.05 to 0.08 mm and a cell depth of 0.13 to 0.17 mm. Another pre-printed flexographic plate is made of the same material to produce a flexible full plate. In the step 2, the ink is a water-based ink made of acrylic acid and organic pigments, the glossiness of the water-based ink is 20-30 GS, the quick drying time is 8-12 seconds, and the viscosity is 15-20 mPa·s. The wax liquid is made of solid paraffin, diluent, and emulsifier in a certain proportion. The wax liquid is stirred for 1 hour, cooled for 12 hours, filtered through a 250-mesh filter, and has a viscosity of 12-15 mPa·s. In the step 3, the pre-printed flexographic plate, the flexible wax plate, and the configured ink and wax liquid are inspected to ensure the quality of the materials. In the step 4, the flexible full plate is used to pre-treat the surface of the corrugated cardboard; In the step 5, the corrugated cardboard with printing content requirements is overprinted, and in the step 6, the quality of the printed pattern on the overprinted corrugated cardboard is inspected to ensure the printing pass rate; In the step 7, a printing device is used to place the flexible wax plate in the first group and the flexible full plate in the second group, and the wax liquid is applied to the surface of the corrugated cardboard; In the eighth step, the waxed corrugated cardboard is subjected to waterproof, humidity and compression tests, and the next step is performed after the test is passed; In the step nine, the corrugated cardboard is cut using a die-cutting machine according to the processing size requirements of the carton; In the step 10, the die-cut corrugated cardboard is glued or stapled to complete the production of the carton.