Moisture-proof high-strength corrugated paperboard and preparation method thereof

Abstract

The present invention discloses a moisture-proof high-strength corrugated paperboard and a preparation method thereof, which relates to the technical field of corrugated paperboard, and comprises a corrugated paper core; corrugated paper layers arranged on the upper and lower sides of the corrugated paper core; and inner and outer paperboards arranged outside the corrugated paper layers; wherein the corrugated paper core is composed of upper and lower layers of moisture-proof coatings and a film layer in the middle layer. When the present invention manufactures a reinforcing frame, the use of polycaprolactone can improve the strength of the reinforcing frame, and the environmental protection of the reinforcing frame can also be used to recycle the reinforcing frame when the corrugated paperboard is recycled. The setting of shape memory plastic can also ensure that the reinforcing frame recovers its original shape after being squeezed. The use of casein can increase the performance of plasticizers and tackifiers, and ensure that the mixing of polycaprolactone and shape memory plastic is more sufficient.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated paperboard, in particular to a moisture-proof high-strength corrugated paperboard and a preparation method thereof. Background Art

[0002] Corrugated cardboard is a multi-layer adhesive body with high mechanical strength. It can withstand collisions and falls during transportation. However, during transportation, the corrugated cardboard is squeezed and deformed, and it is difficult to restore it to its original shape. Therefore, it is impossible to use corrugated cardboard for secondary packaging, resulting in a low reuse rate. Secondly, most corrugated cardboards are stacked in warehouses, and the humid air in the warehouse can easily invade the interior of the corrugated cardboard. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing moisture-proof high-strength corrugated paperboard and its preparation method, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide a moisture-proof high-strength corrugated paperboard and a preparation method thereof, the purpose of which is to improve the reuse rate of the corrugated paperboard and enhance its own moisture resistance.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a moisture-proof high-strength corrugated paperboard, comprising:

[0006] Corrugated paper core;

[0007] Corrugated paper layers arranged on the upper and lower sides of the corrugated paper core;

[0008] and inner paperboard and outer paperboard arranged outside the corrugated paper layer;

[0009] The corrugated paper core is composed of two layers of moisture-proof coatings, an upper layer and a lower layer, and a film layer in the middle layer.

[0010] As a preferred solution of the moisture-proof high-strength corrugated paperboard described in the present invention, a reinforcing frame is arranged inside the corrugated paper layer.

[0011] As a preferred solution of the moisture-proof high-strength corrugated paperboard described in the present invention, the corrugated paper layers are symmetrically arranged with respect to the corrugated paper core, and a gap is arranged between two adjacent corrugated paper layers, and the gap range is 0.2-0.5 cm.

[0012] As a preferred solution of the moisture-proof high-strength corrugated paperboard described in the present invention, the inner paperboard, the corrugated paper layer, the corrugated paper core and the outer paperboard are all connected by adhesive bonding.

[0013] A method for preparing moisture-proof high-strength corrugated paperboard comprises the following steps:

[0014] S1, making the corrugated paper core, mixing wood pulp, silicone polymer and stabilizer, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the film layer, then mixing polyvinyl chloride, thermoplastic polyurethane, plasticizer and adhesive, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the moisture-proof coating, and finally placing the moisture-proof coating on the upper and lower sides of the film layer respectively, and extruding it using a press, and finally obtaining the corrugated paper core;

[0015] S2, making the corrugated paper layer, bending the corrugated base paper by a single-facer to form a wavy paper, and then flattening the second bend every other bend to obtain the corrugated paper layer;

[0016] S3, assembling the reinforcing frame, setting a spacing distance, digging a groove inside the corrugated paper layer according to the spacing distance, and then embedding the reinforcing frame into the groove, and gluing it with starch glue to obtain a combination of the reinforcing frame and the corrugated paper layer;

[0017] S4, making the inner paperboard and the outer paperboard, mixing wood pulp, PETG, an adhesive and a stabilizer, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the inner paperboard and the outer paperboard;

[0018] S5, assembling corrugated paperboards, applying glue on both sides of the corrugated paper core, symmetrically gluing the corrugated paper layers on both sides of the corrugated paper core, setting a gap between two adjacent corrugated paper layers, and then gluing the inner paperboard and the outer paperboard on the outside of the corrugated paper layers respectively.

[0019] As a preferred embodiment of the method for preparing a moisture-proof high-strength corrugated paperboard of the present invention, wherein: in step S1, the ratio of wood pulp, silicone polymer and stabilizer is 60.1:38.2:1.7, the mixing time using the mixing device and the heater is 15-18 minutes, the temperature of the heater is set to 25-35°C, and the thickness of the film layer extruded by the extruder is 0.1-0.2 cm;

[0020] Secondly, the ratio of polyvinyl chloride, thermoplastic polyurethane, plasticizer and adhesive is 47.3:47.3:3.2:2.2, the mixing time using the mixing equipment and the heater is 25-30 minutes, the temperature of the heater is set to 60-80°C, and the thickness of the moisture-proof coating extruded by the extruder is 0.05-0.1 cm.

[0021] As a preferred embodiment of the method for preparing a moisture-proof high-strength corrugated paperboard of the present invention, wherein: in step S1, when the laminating machine is extruding, an adhesive is applied to the surface of the film layer, the temperature is set to 30° C., the extrusion gap of the laminating machine is 0.2-0.4 cm, and the extruded corrugated paper core is cooled;

[0022] Among them, the cooling method adopts air cooling.

[0023] As a preferred embodiment of the method for preparing a moisture-proof high-strength corrugated paperboard described in the present invention, wherein: in step S2, 35 to 50 parts of bamboo pulp, 5 to 15 parts of polyamide fiber, 3 to 5 parts of carbon black, 2 to 3 parts of plasticizer, and 0.3 to 0.5 parts of tackifier are selected, and a mechanical mixing method is used. The mixing time is 20 to 45 minutes, and the mixing temperature is 40 to 45°C. Then, natural drying is performed and the corrugated paper layer is obtained after standing for 30 minutes to 60 minutes.

[0024] As a preferred solution of the method for preparing a moisture-proof high-strength corrugated paperboard of the present invention, wherein: in step S3, the inside of the corrugated paper layer is slotted by a slotting machine, and the intervals of each slot are made the same according to the width of the corrugated paper layer, and a reinforcing frame is embedded in the slot;

[0025] Secondly, select 20-33 parts of polycaprolactone, 15-18 parts of shape memory plastic, 3-12 parts of casein, 1-3 parts of plasticizer, and 0.3-0.5 parts of viscosity enhancer, mix them for 30-60 minutes, melt the mixture in a hot melt machine for 15-30 minutes, set the temperature to 110-135°C, add it to the molding mold, and after cooling, obtain a reinforcement frame with the same shape as the slot.

[0026] As a preferred embodiment of the method for preparing a moisture-proof high-strength corrugated paperboard of the present invention, in step S4, the ratio of wood pulp, PETG, adhesive and stabilizer is 65.5:32.5:1.7:0.3, PETG is heated separately, the heating time is 25-40 minutes, the heating temperature is 180-230°C, and after heating, it is added to the mixture of wood pulp, adhesive and stabilizer, mixed by using a mixing device, and finally pressed into a paperboard shape by a papermaking machine, and dried in a dryer, and the temperature of the dryer is preheated at 85-95°C.

[0027] Beneficial effects of the present invention:

[0028] 1. When making corrugated paper core, the use of silicone polymer makes the corrugated paper core have a certain thermal stability, thereby increasing its own fire resistance, which can protect the packaged items. It has the characteristics of hydrophobicity, which can effectively prevent moisture penetration and protect the material from moisture damage. It complements the inner and outer cardboards to increase its own water resistance. The use of PETG can increase the barrier of corrugated cardboard to water vapor, thereby playing a moisture-proof role. Finally, the silicone polymer can be mixed and mixed by extrusion molding after mixing.

[0029] 2. When making corrugated paper layers, the use of polyamide fiber can increase its own tensile strength. After being mixed into corrugated paper layers, it can increase the tensile resistance of the corrugated paper layers, thereby increasing the elongation of the corrugated paper layers. The addition of carbon black can further increase the tensile strength and prevent the corrugated paper layers from splitting when slightly pulled.

[0030] 3. When making the reinforcement frame, the use of polycaprolactone can improve the strength of the reinforcement frame, and its own environmental protection can be recycled when the corrugated cardboard is recycled. The setting of shape memory plastic can also ensure that the reinforcement frame recovers its original shape after being squeezed. The use of casein can increase the performance of plasticizers and tackifiers, ensuring that the polycaprolactone and shape memory plastic are mixed more fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0032] Figure 1 The present invention is a schematic diagram of the overall structure of a moisture-proof high-strength corrugated paperboard.

[0033] Figure 2 The present invention is a schematic diagram of the main structure of a moisture-proof high-strength corrugated paperboard.

[0034] Figure 3 It is a schematic diagram of the enlarged front view of the structure of a moisture-proof high-strength corrugated paperboard of the present invention.

[0035] Figure 4 The present invention is a schematic diagram of the corrugated paper layer structure of a moisture-proof high-strength corrugated paperboard.

[0036] Figure 5 The present invention is a schematic diagram of the inward bending structure of the corrugated paper layer of the moisture-proof high-strength corrugated paperboard.

[0037] Figure 6 The present invention is a schematic diagram of a corrugated paper layer of a moisture-proof high-strength corrugated paperboard being bent outward. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0042] Unless otherwise specified, the raw materials used in the present invention are all commercially available in the art. Example

[0043] Reference Figure 1~Figure 4 , which is the first embodiment of the present invention, provides a moisture-proof high-strength corrugated paperboard, the device comprising:

[0044] Corrugated paper core 3;

[0045] Corrugated paper layers 2 arranged on the upper and lower sides of the corrugated paper core 3;

[0046] and an inner paperboard 1 and an outer paperboard 4 arranged outside the corrugated paper layer 2;

[0047] The corrugated paper core 3 is composed of two layers of moisture-proof coatings, an upper layer and a lower layer, and a film layer in the middle layer.

[0048] Furthermore, a reinforcing frame 21 is provided inside the corrugated paper layer 2. By using the reinforcing frame 21, the strength and hardness of the corrugated paper layer 2 can be ensured, and the shape can be restored after being squeezed.

[0049] Furthermore, the corrugated paper layers 2 are symmetrically arranged with respect to the corrugated paper core 3, and a gap is arranged between two adjacent corrugated paper layers 2, and the gap range is 0.2-0.5 cm;

[0050] The setting of the gap structure can make the side edges of the corrugated paper layer 2 bend to both sides when the corrugated paperboard is squeezed, and then they can support each other. Figure 5 As shown, secondly, when bending inward, the arrangement of the inner paperboard 1 and the outer paperboard 4 can also provide support, that is, Figure 6 shown.

[0051] The inner paperboard 1, the corrugated paper layer 2, the corrugated paper core 3 and the outer paperboard 4 are all connected by adhesive bonding to ensure the connectivity between the corrugated paperboards. Example

[0052] This embodiment is different from the first embodiment in that it provides a method for preparing moisture-proof high-strength corrugated paperboard, comprising the following steps:

[0053] S1, making the corrugated paper core 3, mixing wood pulp, silicone polymer and stabilizer, weighing the materials, and mixing them with a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the film layer, then mixing polyvinyl chloride, thermoplastic polyurethane, plasticizer and adhesive, weighing the materials, and mixing them with a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the moisture-proof coating, and finally placing the moisture-proof coating on the upper and lower sides of the film layer respectively, and extruding it with a press, and finally obtaining the corrugated paper core 3;

[0054] The ratio of wood pulp, silicone polymer and stabilizer is 60.1:38.2:1.7, the mixing time using the mixing device and the heater is 15-18 minutes, the temperature of the heater is set at 25-35° C., and the thickness of the film layer extruded by the extruder is 0.1-0.2 cm;

[0055] Secondly, the ratio of polyvinyl chloride, thermoplastic polyurethane, plasticizer and adhesive is 47.3:47.3:3.2:2.2, the mixing time using the mixing device and the heater is 25-30 minutes, the temperature of the heater is set to 60-80° C., and the thickness of the moisture-proof coating extruded by the extruder is 0.05-0.1 cm;

[0056] When the laminating machine is extruding, an adhesive is applied to the surface of the film layer, the temperature is set to 30° C., the extrusion gap of the laminating machine is 0.2-0.4 cm, and the extruded corrugated paper core 3 is cooled;

[0057] Among them, the cooling method adopts air cooling.

[0058] S2, making the corrugated paper layer 2, bending the corrugated base paper by a single-facer to form a wavy paper, and then flattening the second bend every other bend to obtain the corrugated paper layer 2;

[0059] Select 35-50 parts of bamboo pulp, 5-15 parts of polyamide fiber, 3-5 parts of carbon black, 2-3 parts of plasticizer, and 0.3-0.5 parts of tackifier, use mechanical mixing, the mixing time is 20-45 minutes, the mixing temperature is 40-45°C, and then naturally dry and stand for 30-60 minutes to obtain the corrugated paper layer 2.

[0060] S3, assembling the reinforcing frame 21, setting a spacing distance, digging a groove inside the corrugated paper layer 2 according to the spacing distance, and then embedding the reinforcing frame 21 into the groove, and gluing it with starch glue to obtain a combination of the reinforcing frame 21 and the corrugated paper layer 2;

[0061] The inside of the corrugated paper layer 2 is slotted by a slotting machine, and the intervals of each slot are made the same according to the width of the corrugated paper layer 2, and a reinforcing frame 21 is embedded in the slot;

[0062] Secondly, 20 to 33 parts of environmentally friendly polycaprolactone, 15 to 18 parts of shape memory plastic, 3 to 12 parts of casein, 1 to 3 parts of plasticizer, and 0.3 to 0.5 parts of tackifier are selected, and the mixture is mixed for 30 to 60 minutes, and then melted by a hot melt machine for 15 to 30 minutes, and the temperature is set to 110 to 135°C, and then added to the molding mold. After cooling, a reinforcing frame 21 with the same shape as the slot is obtained.

[0063] S4, making the inner paperboard 1 and the outer paperboard 4, mixing wood pulp, PETG, adhesive and stabilizer, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the inner paperboard 1 and the outer paperboard 4;

[0064] The ratio of wood pulp, PETG, adhesive and stabilizer is 65.5:32.5:1.7:0.3. PETG is heated separately for 25-40 minutes at a temperature of 180-230°C. After heating, it is added to the mixture of wood pulp, adhesive and stabilizer and mixed using a mixing device. Finally, it is pressed into a cardboard shape through a papermaking machine and dried in a dryer. The temperature of the dryer is preheated at 85-95°C.

[0065] S5, assembling corrugated paperboards, applying glue on both sides of the corrugated paper core 3, symmetrically adhering the corrugated paper layers 2 to the two sides of the corrugated paper core 3, setting a gap between two adjacent corrugated paper layers 2, and then adhering the inner paperboard 1 and the outer paperboard 4 to the outside of the corrugated paper layer 2 respectively.

[0066] In summary, when making the corrugated paper core 3, due to the use of the organic silicon polymer, the corrugated paper core 3 has a certain thermal stability, thereby increasing its own fire resistance, which can protect the packaged items, and it has the characteristic of being hydrophobic, which can effectively prevent moisture penetration and protect the material from moisture damage, and complements the inner paperboard 1 and the outer paperboard 4 to increase its own water resistance, and the use of PETG can increase the barrier property of the corrugated paperboard to water vapor, thereby playing a moisture-proof role, and finally the organic silicon polymer can be mixed and mixed by extrusion molding after mixing;

[0067] When making the corrugated paper layer 2, the use of polyamide fiber can increase its own tensile strength. After being mixed into the corrugated paper layer 2, the tensile resistance of the corrugated paper layer 2 can be increased, thereby increasing the elongation of the corrugated paper layer 2. The addition of carbon black can further increase the tensile strength, thereby preventing the corrugated paper layer 2 from splitting when slightly pulled.

[0068] When manufacturing the reinforcing frame 21, the use of polycaprolactone can improve the strength of the reinforcing frame 21, and due to its own environmental friendliness, the reinforcing frame 21 can be recycled when the corrugated cardboard is recycled. The setting of the shape memory plastic can also ensure that the reinforcing frame 21 recovers its original shape after being squeezed. The use of casein can increase the performance of the plasticizer and the thickener, ensuring that the polycaprolactone and the shape memory plastic are mixed more fully. Example

[0069] Weigh the formula of corrugated paper layer 2 according to the following mass parts:

[0070] Take 35 parts of bamboo pulp, 5 parts of polyamide fiber, 3 parts of carbon black, 2 parts of plasticizer, and 0.3 parts of tackifier, mix them mechanically for 20 minutes at a temperature of 40° C., dry them naturally and let them stand for 30 minutes to produce a corrugated paper layer 2;

[0071] Weigh the formula of the reinforcement frame 21 according to the following mass parts:

[0072] Take 20 parts of polycaprolactone, 15 parts of shape memory plastic, 3 parts of casein, 1 part of plasticizer, and 0.3 parts of tackifier, mix them mechanically for 30 minutes, and then melt the mixture through a hot melt machine for 15 minutes at a temperature of 110°C. Example

[0073] Weigh the formula of corrugated paper layer 2 according to the following mass parts:

[0074] Take 45 parts of bamboo pulp, 12 parts of polyamide fiber, 4 parts of carbon black, 2.5 parts of plasticizer, and 0.4 parts of tackifier, mix them mechanically for 35 minutes at a temperature of 43° C., dry them naturally and let them stand for 45 minutes to produce a corrugated paper layer 2;

[0075] Weigh the formula of the reinforcement frame 21 according to the following mass parts:

[0076] Take 26 parts of polycaprolactone, 17 parts of shape memory plastic, 7 parts of casein, 2 parts of plasticizer, and 0.4 parts of tackifier, mix them mechanically for 45 minutes, and then melt the mixture through a hot melt machine for 25 minutes at a temperature of 125°C. Example

[0077] Weigh the formula of corrugated paper layer 2 according to the following mass parts:

[0078] Take 50 parts of bamboo pulp, 15 parts of polyamide fiber, 5 parts of carbon black, 3 parts of plasticizer, and 0.5 parts of tackifier, mix them mechanically for 45 minutes at a temperature of 45° C., dry them naturally and let them stand for 60 minutes to produce a corrugated paper layer 2;

[0079] Weigh the formula of the reinforcement frame 21 according to the following mass parts:

[0080] Take 33 parts of polycaprolactone, 18 parts of shape memory plastic, 12 parts of casein, 3 parts of plasticizer, and 0.5 parts of tackifier, mix them mechanically for 60 minutes, and then melt the mixture through a hot melt machine for 30 minutes at a temperature of 135°C.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 2 is that PETG is not added, and the rest of the formula is the same as that of Example 2 to obtain the corrugated paperboard of this comparative example.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 2 is that no silicone polymer is added, and the rest of the formula is the same as that of Example 2 to obtain the corrugated paperboard of this comparative example.

[0085] Comparative Example 3

[0086] The difference between this comparative example and Example 2 is that polycaprolactone and casein are not added, and the rest of the formula is the same as that of Example 2 to obtain the corrugated paperboard of this comparative example.

[0087] Comparative Example 4

[0088] The difference between this comparative example and Example 2 is that polyamide fiber and carbon black are not added, and the rest of the formula is the same as that of Example 2 to obtain the corrugated paperboard of this comparative example.

[0089] The moisture resistance of the corrugated paperboards prepared in Examples 3 to 5 and Comparative Examples 1 to 4 was evaluated and tested, and the results are shown in Table 1:

[0090] Table 1: Comparison of moisture resistance of corrugated cardboard made under different formulations

[0091] Wet warehouse Shower spray with 5mm rainfall Shower spray with 10mm rainfall Soak in water Example 3 45 days 7.3h 2.3h 0.9h Example 4 47 days 8.2h 2.5h 1.1h Example 5 47 days 7.1h 2.6h 1h Comparative Example 1 24 days 0.4h 0.1h 0.04h Comparative Example 2 28 days 1.1h 0.2h 0.08h Comparative Example 3 39 days 1.5h 0.2h 0.07h Comparative Example 4 43 days 1.2h 0.2h 0.07h

[0092] The test method is: use corrugated cardboard to form a closed carton, place a humidity detector inside the carton, set the humidity threshold, and determine the time it takes to reach the humidity threshold.

[0093] It can be clearly seen from Table 1 that the present invention can effectively alleviate the moisture-proof problem in different situations, and greatly increase the moisture-proof effect when naturally stored in a humid warehouse, thereby effectively protecting the items inside.

[0094] The strength evaluation test of the corrugated paperboards prepared in Examples 3 to 5 and Comparative Examples 3 to 4 was performed, and the results are shown in Table 2:

[0095] Table 2: Comparison of the strength of corrugated cardboard produced under different formulations

[0096] The corrugated cardboard is pressed by an extruder to determine the recovery status. For example, "99% / 99% / 99% / 78% / 74%" indicates that the recovery degree of Example 3 is 99%, the recovery degree of Example 4 is 99%, the recovery degree of Example 5 is 99%, the recovery degree of Comparative Example 3 is 78%, and the recovery degree of Comparative Example 4 is 74%. It can be seen from Table 2 that the recovery of the corrugated cardboard can be increased by the combination of polyamide fiber and carbon black, and the combination of polycaprolactone and casein. After being squeezed, it can also be restored to the state before squeezing and can be reused.

[0097] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and ratio of various elements, and parameter values, for example, temperature, pressure, etc., installation arrangement, use of materials, color, directional changes, etc., without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the invention, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments.

[0098] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the present invention.

Claims

1. A moisture-proof high-strength corrugated paperboard, characterized in that: include, Corrugated paper core (3); Corrugated paper layers (2) arranged on the upper and lower sides of the corrugated paper core (3); and an inner paperboard (1) and an outer paperboard (4) arranged outside the corrugated paper layer (2); Wherein, the corrugated paper core (3) is composed of two layers of moisture-proof coating, upper and lower layers, and a film layer in the middle layer; Using a slotting machine to slot the inside of the corrugated paper layer (2), and making the intervals between each slot the same according to the width of the corrugated paper layer (2), and embedding a reinforcing frame (21) inside the slot; 20-33 parts of polycaprolactone, 15-18 parts of shape memory plastic, 3-12 parts of casein, 1-3 parts of plasticizer, and 0.3-0.5 parts of tackifier are selected, mixed for 30-60 minutes, and then melted by a hot melt machine for 15-30 minutes at a temperature of 110-135° C., and then added to a molding mold, and after cooling, a reinforcing frame (21) having the same shape as the slot is obtained; When preparing the inner paperboard (1) and the outer paperboard (4), the ratio of wood pulp, PETG, adhesive and stabilizer is 65.5:32.5:1.7:0.3, PETG is heated separately, the heating time is 25-40 minutes, the heating temperature is 180-230°C, and after heating, it is added to the mixture of wood pulp, adhesive and stabilizer, and mixed using a mixing device, and finally pressed into a paperboard shape by a paper machine, and dried in a dryer, and the temperature of the dryer is preheated to 85-95°C, to obtain the inner paperboard (1) and the outer paperboard (4); Bending the corrugated base paper by a single-facer to form a wavy paper, and then flattening the second bend every other bend to obtain the corrugated paper layer (2); A gap is provided between two adjacent corrugated paper layers (2).

2. The moisture-proof high-strength corrugated paperboard according to claim 1, characterized in that: A reinforcing frame (21) is provided inside the corrugated paper layer (2).

3. The moisture-proof high-strength corrugated paperboard according to claim 2, characterized in that: The corrugated paper layers (2) are symmetrically arranged with respect to the corrugated paper core (3), and a gap is arranged between two adjacent corrugated paper layers (2), with the gap ranging from 0.2 to 0.5 cm.

4. The moisture-proof high-strength corrugated paperboard according to claim 3, characterized in that: The inner paperboard (1), the corrugated paper layer (2), the corrugated paper core (3) and the outer paperboard (4) are all connected by adhesive bonding.

5. A method for preparing moisture-proof high-strength corrugated paperboard, characterized in that: The moisture-proof high-strength corrugated paperboard comprises any one of claims 2 to 4, and the preparation method of the moisture-proof high-strength corrugated paperboard further comprises the following steps: S1, preparing the corrugated paper core (3), mixing wood pulp, silicone polymer and stabilizer, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the film layer, then mixing polyvinyl chloride, thermoplastic polyurethane, plasticizer and adhesive, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and cooperating with the extruder to extrude the moisture-proof coating, and finally placing the moisture-proof coating on the upper and lower sides of the film layer respectively, and extruding them using a press, and finally obtaining the corrugated paper core (3); S2, preparing the corrugated paper layer (2), bending the corrugated base paper by a single-facer to form a wavy paper, and then flattening the second bend every other bend to obtain the corrugated paper layer (2); S3, assembling the reinforcing frame (21), setting a spacing distance, digging a groove inside the corrugated paper layer (2) according to the spacing distance, then embedding the reinforcing frame (21) into the groove, and gluing them with starch glue to obtain a combination of the reinforcing frame (21) and the corrugated paper layer (2); S4, preparing the inner paperboard (1) and the outer paperboard (4), mixing wood pulp, PETG, an adhesive and a stabilizer, weighing the materials, and mixing them using a mixing device and a heater, adding the mixed materials to an extruder, and extruding the inner paperboard (1) and the outer paperboard (4) with the extruder; S5, assembling corrugated paperboards, applying glue to both sides of the corrugated paper core (3), symmetrically gluing the corrugated paper layers (2) to both sides of the corrugated paper core (3), providing a gap between two adjacent corrugated paper layers (2), and then gluing the inner paperboard (1) and the outer paperboard (4) to the outside of the corrugated paper layers (2), respectively.

6. The method for preparing moisture-proof high-strength corrugated paperboard according to claim 5, characterized in that: In step S1, the ratio of wood pulp, silicone polymer and stabilizer is 60.1:38.2:1.7, the mixing time using the mixing device and the heater is 15-18 minutes, the temperature of the heater is set to 25-35° C., and the thickness of the film layer extruded by the extruder is 0.1-0.2 cm; The ratio of polyvinyl chloride, thermoplastic polyurethane, plasticizer and adhesive is 47.3:47.3:3.2:2.2, the mixing time using the mixing device and the heater is 25-30 minutes, the temperature of the heater is set to 60-80° C., and the thickness of the moisture-proof coating extruded by the extruder is 0.05-0.1 cm.

7. The method for preparing moisture-proof high-strength corrugated paperboard according to claim 6, characterized in that: In step S1, when the laminating machine is extruding, an adhesive is applied to the surface of the film layer, the temperature is set to 30° C., the extrusion gap of the laminating machine is set to 0.2-0.4 cm, and the extruded corrugated paper core (3) is cooled; Among them, the cooling method adopts air cooling.

8. The method for preparing moisture-proof high-strength corrugated paperboard according to claim 7, characterized in that: In step S2, 35-50 parts of bamboo pulp, 5-15 parts of polyamide fiber, 3-5 parts of carbon black, 2-3 parts of plasticizer, and 0.3-0.5 parts of tackifier are selected, and a mechanical mixing method is used. The mixing time is 20-45 minutes, and the mixing temperature is 40-45°C. Then, the mixture is naturally dried and left to stand for 30-60 minutes to obtain the corrugated paper layer (2).

9. The method for preparing moisture-proof high-strength corrugated paperboard according to claim 8, characterized in that: In step S3, a slotting machine is used to slot the inside of the corrugated paper layer (2), and according to the width of the corrugated paper layer (2), the intervals between each slot are made the same, and a reinforcing frame (21) is embedded in the slot; 20-33 parts of polycaprolactone, 15-18 parts of shape memory plastic, 3-12 parts of casein, 1-3 parts of plasticizer, and 0.3-0.5 parts of tackifier are selected, mixed for 30-60 minutes, and then melted by a hot melt machine for 15-30 minutes at a temperature set to 110-135° C., and then added to a molding mold. After cooling, a reinforcing frame (21) with the same shape as the slot is obtained.

10. The method for preparing moisture-proof high-strength corrugated paperboard according to claim 9, characterized in that: In step S4, the ratio of wood pulp, PETG, adhesive and stabilizer is 65.5:32.5:1.7:0.3, PETG is heated separately, the heating time is 25-40 minutes, the heating temperature is 180-230°C, and after heating, it is added to the mixture of wood pulp, adhesive and stabilizer, mixed using a mixing device, and finally pressed into a cardboard shape through a papermaking machine, and dried in a dryer, and the temperature of the dryer is preheated at 85-95°C.

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