A type of cardboard for box structure and its manufacturing process

Abstract

This application relates to the field of cardboard and box technology, and particularly to a cardboard for box structures and its manufacturing process. The manufacturing process includes the production of a coated kraft paper layer and the lamination of the cardboard layers. The production process is simple. In the production of the coated kraft paper layer, a film is used as a carrier to laminate the film with the kraft paper, effectively and firmly fusing the special coating applied to the film to the kraft paper, forming a stable and reliable coated kraft paper layer. The coated kraft paper layer is then laminated with an existing cardboard structure to form a fold-resistant, environmentally friendly, and moisture-proof corrugated cardboard. The resulting corrugated cardboard has good fold-resistant properties without affecting the printing of graphics on the coated kraft paper layer. Furthermore, this coated kraft paper layer is more easily degraded and more environmentally friendly than plasticized cardboard, and it also resists moisture, meeting the moisture-proof requirements for product packaging and storage.

Description

Technical Field

[0001] This application relates to the field of cardboard and box manufacturing technology, and in particular to a cardboard for box structure, a manufacturing process, and a box manufacturing process. Background Technology

[0002] Currently, the most popular traditional packaging for cigarette boxes on the market is paper cigarette boxes, whose formed cardboard includes outer paper, corrugated paper, and inner paper. See details... Figure 2 The paper cigarette boxes made from this type of cardboard have poor moisture resistance and a low recycling rate. To optimize the cigarette box structure, a new type of cardboard and box body has been introduced to the market. This new cardboard includes plasticized face paper, plasticized corrugated paper, and plasticized lining paper. Cigarette boxes made from this plasticized cardboard can be recycled relatively many times, with actual verification showing it can be recycled up to about 40 times. However, this plasticized cardboard is not easily degraded, and the plasticized cigarette boxes are prone to fogging in winter, affecting product storage. The industry urgently needs to research a new type of cardboard for box body structure and its manufacturing process. Summary of the Invention

[0003] This invention provides a cardboard for a box structure, a manufacturing process, and a box manufacturing process to solve the problems existing in the prior art.

[0004] The technical solution provided by this invention is as follows:

[0005] A paperboard manufacturing process for box structures includes the production of coated kraft paper layers and paperboard layer lamination.

[0006] The fabrication of the coated kraft paper layer includes:

[0007] A special coating is applied to the film, and the film coated with the special coating is laminated with kraft paper using a laminating device to form the first composite layer;

[0008] The first composite layer formed by the composite process is air-dried or oven-dried, and the first composite layer after air-drying or oven-driing is peeled off by a peeling machine to remove the film in the first composite layer, forming a coated kraft paper layer.

[0009] The paperboard layer composite includes:

[0010] Corrugated cardboard is formed by laminating coated kraft paper layers, face paper layers, corrugated paper layers, and liner paper layers using a corrugated cardboard production line.

[0011] Furthermore, the special coating is a self-crosslinking modified acrylate polymer emulsion.

[0012] Furthermore, the drying process of the first composite layer is as follows: the first composite layer formed by the composite is dried by a drying device at a drying temperature of 110-120 degrees Celsius.

[0013] Furthermore, before peeling off the first composite layer, the method further includes: detecting the moisture content of the first composite layer.

[0014] Furthermore, the film coated with the special coating is a PET film.

[0015] This application also provides a cardboard for box structure, comprising a coated kraft paper layer, a face paper layer, a corrugated paper layer and an inner paper layer arranged sequentially along the thickness direction of the cardboard; the cardboard for box structure is corrugated cardboard made using the above-mentioned cardboard manufacturing process for box structure.

[0016] Further, the thickness of the kraft paper layer of the coating film is 1-3 mm; the thickness of the face paper layer is 1-3 mm; the thickness of the corrugated paper layer is 3-5 mm; and the thickness of the inner paper layer is 1-2 mm. Preferably, the wet weight of the coating film layer is not less than 5 g / m², and the thickness of the face paper layer commonly used in cigarette box structures is 300 g / m² ± 8, the inner paper layer is 250 g / m² ± 8, and the corrugated paper layer is 180 g / m² ± 5.

[0017] This application also provides a box manufacturing process, including the aforementioned cardboard for the box structure, specifically including the following steps:

[0018] The cardboard for the box structure is processed into box-shaped cardboard by the cardboard line equipment and cut according to the die lines of the box model;

[0019] The box body is glued together using a gluing machine, thus forming the box body.

[0020] Furthermore, before the box body forming paperboard is bonded and formed, the process also includes: graphic printing and grooving of the box body forming paperboard.

[0021] Furthermore, the graphic printing and slotting of the box-shaped cardboard specifically includes: printing graphics and slotting the box-shaped cardboard using a corrugated printing equipment according to a set template program.

[0022] Beneficial effects:

[0023] This application provides a paperboard manufacturing process for box structures, including the production of a coated kraft paper layer and the lamination of the paperboard layer; the production process is simple; by using a film as a carrier, the special coating film can be effectively fused to the kraft paper in the form of film-kraft paper lamination to form a stable and reliable coated kraft paper layer; the coated kraft paper layer can then be laminated with an existing paperboard structure to form a fold-resistant, environmentally friendly and moisture-proof corrugated paperboard.

[0024] The cardboard for the box structure of this application adds a new coated kraft paper layer to the existing cardboard structure, which improves the folding resistance of the cardboard without affecting the printing of graphics on the coated kraft paper layer; in addition, the coated kraft paper layer is more environmentally friendly and harmless than plasticized cardboard, and also has the function of resisting moisture, meeting the moisture-proof requirements for product packaging and storage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart of a paperboard manufacturing process for a box structure according to this application;

[0027] Figure 2 This is a structural diagram of existing cardboard boxes (face paper, corrugated paper, and liner paper; including the three-layer cardboard structure with plasticizing treatment);

[0028] Figure 3 This is a structural schematic diagram of a cardboard box structure according to this application;

[0029] Figure reference numerals: 10, coated kraft paper layer; 20, face paper layer; 30, corrugated paper layer; 40, liner paper layer. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0034] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0035] Reference Figure 1 As shown, the present invention provides a paperboard manufacturing process for box structures, including the production of coated kraft paper layers and paperboard layer lamination;

[0036] The fabrication of the coated kraft paper layer includes:

[0037] A special coating is applied to the film, and the film coated with the special coating is laminated with kraft paper using a laminating device to form the first composite layer;

[0038] The first composite layer formed by the composite process is air-dried or oven-dried, and the first composite layer after air-drying or oven-driing is peeled off by a peeling machine to remove the film in the first composite layer, forming a coated kraft paper layer.

[0039] The paperboard layer composite includes:

[0040] Corrugated cardboard is formed by laminating coated kraft paper layer 10, face paper layer 20, corrugated paper layer 30 and liner paper layer 40 using a corrugated cardboard production line.

[0041] This application discloses a manufacturing process for cardboard for box structures, which is simple in production steps. By using a film as a carrier and combining the film with kraft paper, it is possible to effectively ensure that the film formed by the special coating is fused to the kraft paper, forming a stable and reliable coated film kraft paper layer. Then, by combining the coated film kraft paper layer with the existing cardboard structure, corrugated cardboard for box structures that is durable, environmentally friendly, and moisture-proof can be formed.

[0042] Preferably, a coating roller is used to apply a special coating to the film. It should be noted that the corrugated cardboard production line, peeling machine, and laminating equipment are all existing technologies.

[0043] As a preferred embodiment, the special coating is a self-crosslinking modified acrylic polymer emulsion. This self-crosslinking modified acrylic polymer emulsion, acting as a film carrier, is laminated onto kraft paper to form a coated kraft paper layer. This effectively fuses the self-crosslinking modified acrylic polymer emulsion film layer onto the kraft paper, forming a stable and reliable coated kraft paper layer. The coated kraft paper layer combines the excellent properties of both materials, exhibiting characteristics such as being odorless, water-resistant, UV-resistant, heat-resistant, aging-resistant, solvent-resistant, folding-resistant, and environmentally friendly without containing toxic substances. Furthermore, this coated kraft paper layer, when laminated with existing cardboard structures (face paper layer, corrugated paper layer, and liner paper layer), can form fold-resistant, environmentally friendly, and moisture-proof corrugated cardboard.

[0044] As a preferred embodiment, the drying process of the first composite layer is as follows: the first composite layer formed by lamination is dried using a drying device at a temperature of 110-120 degrees Celsius. It should be noted that the drying device is existing drying chamber equipment; the drying chamber equipment includes at least one drying chamber section, with multiple drying chamber sections connected in series.

[0045] And a conveying device, which is arranged in the drying room, with both ends of the conveying device extending out of both ends of all the connected drying rooms; the conveying device is used for the drying and conveying of the first composite layer in the drying room.

[0046] The preferred conveying device is an existing conveyor belt type conveyor; during drying, the cardboard is placed on the conveyor belt of the conveyor device and moved for transport; with a fixed conveying distance and conveying speed, the drying time can be determined; by adjusting the drying temperature, the drying effect of the first composite layer can be controlled.

[0047] As a preferred embodiment, before peeling off the first composite layer, the method further includes: detecting the moisture content of the first composite layer. By detecting the moisture content of the first composite layer, it is possible to select a moisture content range for the first composite layer that is easy to peel off and has high peel quality; at the same time, it is beneficial to control an appropriate drying temperature and drying time so that the first composite layer after the drying process is in the moisture content range for easy peeling and high peel quality, thus ensuring that a complete coated kraft paper layer is obtained.

[0048] The film used in the coating process is a PET film, which facilitates the stable bonding of the coating to the kraft paper layer.

[0049] The cardboard manufacturing process for the box structure described in this application is simple. In the production of the coated kraft paper layer, PET film is used as a carrier, and then the PET film is laminated with kraft paper. This effectively fuses the self-crosslinking modified acrylic polymer emulsion film layer coated on the PET film to the kraft paper, forming a stable and reliable coated kraft paper layer. This coated kraft paper layer is then laminated with the existing cardboard structure (face paper layer, corrugated paper layer, and liner paper layer) to form a fold-resistant, environmentally friendly, and moisture-proof corrugated cardboard. The resulting corrugated cardboard has good fold-resistant properties without affecting the printing of graphics on the coated kraft paper layer. Furthermore, this coated kraft paper layer is more environmentally friendly and harmless than plasticized cardboard, and also resists moisture, meeting the moisture-proof requirements for product packaging and storage.

[0050] See Figure 3 This application also provides a cardboard for box structure, comprising a coated kraft paper layer 10, a face paper layer 20, a corrugated paper layer 30 and an inner paper layer 40 arranged sequentially along the thickness direction of the cardboard; the cardboard for box structure is corrugated cardboard made using the above-mentioned cardboard manufacturing process for box structure.

[0051] In a preferred embodiment, the thickness of the kraft paper layer of the coating film is 1-3 mm; the thickness of the face paper layer is 1-3 mm; the thickness of the corrugated paper layer is 3-5 mm; and the thickness of the inner paper layer is 1-2 mm. Preferably, the wet weight of the coating film layer is not less than 5 g / m², the face paper layer is 300 g / m² ± 8, the inner paper layer is 250 g / m² ± 8, and the corrugated paper layer is 180 g / m² ± 5.

[0052] The cardboard for the box structure of this application adds a new coated kraft paper layer to the existing cardboard structure, which improves the folding resistance of the cardboard without affecting the printing of graphics on the coated kraft paper layer. In addition, the coated kraft paper layer is easier to degrade and more environmentally friendly than plasticized cardboard, and it also has the function of resisting moisture, meeting the moisture-proof requirements for product packaging and storage.

[0053] This application also provides a box manufacturing process, including the aforementioned cardboard for the box structure, specifically including the following steps:

[0054] The cardboard for the box structure is processed into box-shaped cardboard by the cardboard line equipment and cut according to the die lines of the box model;

[0055] The box body is glued together using a gluing machine, thus forming the box body.

[0056] The production process is simple and can be completed using existing cardboard production lines and gluing machines, which reduces production costs while ensuring corresponding production efficiency.

[0057] As a preferred embodiment, before the box-shaped cardboard is bonded and formed, the method further includes: graphic printing and slotting of the box-shaped cardboard. Specifically, the graphic printing and slotting of the box-shaped cardboard includes: printing graphics and slotting the box-shaped cardboard using a corrugated printing machine according to a set template program.

[0058] The foregoing descriptions of the embodiments, not detailed in detail above, refer to existing technologies. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A manufacturing process for cardboard for box structures, characterized in that, This includes the production of coated kraft paper layers and the lamination of paperboard layers; The fabrication of the coated kraft paper layer includes: A special coating is applied to the film, and the film coated with the special coating is laminated with kraft paper using a laminating device to form the first composite layer; The first composite layer formed by the composite process is dried, and the dried first composite layer is peeled off by a peeling device to remove the film in the first composite layer, forming a coated kraft paper layer. The paperboard layer composite includes: Corrugated cardboard is formed by laminating coated kraft paper layers, face paper layers, corrugated paper layers, and liner paper layers using a corrugated cardboard production line. The special coating is a self-crosslinking modified acrylic polymer emulsion; The drying process for the first composite layer is as follows: the first composite layer formed by lamination is dried by a drying device at a temperature of 110-120 degrees Celsius; a special coating is applied to the film, and the film is a PET film.

2. The paperboard manufacturing process for the box structure as described in claim 1, characterized in that, Before peeling off the first composite layer, the method further includes: detecting the moisture content of the first composite layer.

3. A type of cardboard for a box structure, characterized in that, The cardboard used for the box structure is corrugated cardboard manufactured using any one of the box structure cardboard manufacturing processes described in claims 1-2.

4. The cardboard for the box structure as described in claim 3, characterized in that, The thickness of the kraft paper layer of the coating film is 1-3mm; the thickness of the face paper layer is 1-3mm; the thickness of the corrugated paper layer is 3-5mm; and the thickness of the inner paper layer is 1-2mm.

5. A box manufacturing process, characterized in that, The cardboard for the box structure as described in claim 3 or 4 specifically includes the following steps: The cardboard for the box structure is processed into box-shaped cardboard by the cardboard line equipment and cut according to the die lines of the box model; The box body is glued together using a gluing machine, thus forming the box body.

6. The box manufacturing process as described in claim 5, characterized in that, Before the box body forming paperboard is bonded and formed, the process also includes: graphic printing and grooving of the box body forming paperboard.

7. The housing manufacturing process as described in claim 6, characterized in that, The corrugated printing equipment prints graphics and cuts grooves on the cardboard for the box body according to the set template program.

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