Composite card paper, cigarette case and preparation method thereof

Abstract

This invention discloses a composite cardboard, a cigarette box, and a method for preparing the same. The composite cardboard includes a face paper layer, a back paper layer, and a lift-up moisture-absorbing functional unit. The back paper layer has intermittent lift lines corresponding to the lift-up moisture-absorbing functional unit, forming a lift-up area. The lift-up moisture-absorbing functional unit includes a functional isolation layer, a one-way permeable moisture layer, a moisture-absorbing buffer layer, and a first barrier layer arranged sequentially along its thickness direction. The first barrier layer isolates the moisture-absorbing buffer layer from odors, chemical activity, and particle migration, thereby preventing the moisture-absorbing buffer layer from becoming inactive. The functional isolation layer isolates the moisture-absorbing buffer layer. The moisture-absorbing buffer layer actively absorbs moisture after the lift-up area is lifted, thus buffering and regulating the humidity around it. In this way, the lift-up moisture-absorbing functional unit effectively buffers and regulates the humidity inside the packaging box, reducing the risk of quality deterioration due to moisture absorption.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and in particular to a composite cardboard, a cigarette box, and a method for preparing the same. Background Technology

[0002] Cigarettes and other cigarette products are extremely sensitive to environmental humidity during storage and use. The tobacco in cigarettes is highly hygroscopic, easily absorbing moisture from the air, leading to increased moisture content. This can cause the tobacco to clump, reduce combustion performance, worsen taste, and even cause mold growth. This is especially true after the consumer opens the cigarette pack. The original sealing structure is broken, and the inside of the pack becomes connected to the external environment, significantly affecting humidity and causing rapid deterioration of the cigarette quality. Therefore, preventing cigarettes from absorbing moisture and spoiling after the pack is opened is a pressing issue that needs to be addressed. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a composite cardboard, a cigarette box, and a method for preparing the same. By lifting the moisture-absorbing functional unit, the humidity inside the packaging box is buffered and regulated, effectively reducing the risk of quality deterioration of the packaged goods due to moisture absorption.

[0004] To achieve the above objectives, the technical solution provided by the present invention is as follows: This invention provides a composite cardboard with a lift-up moisture-absorbing function, comprising a face paper layer and a back paper layer arranged on top of each other, and a lift-up moisture-absorbing functional unit disposed between the face paper layer and the back paper layer; the back paper layer is provided with intermittent lift lines corresponding to the lift-up moisture-absorbing functional unit, and forms a lift-up area for exposing the lift-up moisture-absorbing functional unit to the back paper layer; the lift-up moisture-absorbing functional unit is in a closed and isolated state when not in use, and includes a functional isolation layer, a one-way permeable water vapor layer, a moisture-absorbing buffer layer, and a first barrier layer arranged sequentially along its thickness direction; the first barrier layer is located between the moisture-absorbing buffer layer and the face paper layer, and is used to isolate the moisture-absorbing buffer layer from odor, chemical activity, and particle migration, thereby preventing the moisture-absorbing buffer layer from deactivating; the functional isolation layer is located between the back paper layer and the one-way permeable water vapor layer, and is used to isolate the moisture-absorbing buffer layer; the moisture-absorbing buffer layer is used to actively absorb moisture after the lift-up area is lifted, so as to form a buffer regulation setting for the humidity around it.

[0005] Furthermore, the moisture-absorbing material of the moisture-absorbing buffer layer is selected from one or more of inorganic porous adsorbent materials, natural polymeric moisture-absorbing materials, and synthetic polymeric moisture-absorbing materials; wherein, the inorganic porous adsorbent materials include one or more of silica gel microparticles and molecular sieves; the natural polymeric moisture-absorbing materials include one or more of modified starch and modified cellulose; the synthetic polymeric moisture-absorbing materials include one or more of cross-linked sodium polyacrylate resin and cross-linked polyvinyl alcohol moisture-absorbing resin; the thickness of the moisture-absorbing buffer layer is 50-100 μm.

[0006] Furthermore, the one-way permeable water vapor layer is a microporous PE membrane, a modified PE membrane, or a co-extruded PE membrane with one-way water vapor permeability, and its thickness is 10-20 μm.

[0007] Furthermore, the functional isolation layer is a coating formed by coating and drying a food-grade polyurethane dispersion, with a thickness of 1–5 μm.

[0008] Furthermore, the opposing surfaces of the face paper layer and the back paper layer are respectively coated with an adhesive layer; and the first barrier layer is close to the face paper layer, and the functional isolation layer is close to the back paper layer.

[0009] Furthermore, a second barrier layer is provided between the functional isolation layer and the base paper layer; and / or, a third barrier layer is provided between the face paper layer and the adhesive layer on the face paper layer; the coating area of ​​the second barrier layer and / or the third barrier layer both correspond to the area of ​​the peel-off moisture-absorbing functional unit.

[0010] Furthermore, the first barrier layer, the second barrier layer, and the third barrier layer are ethylene-vinyl alcohol copolymer barrier coatings or polyvinylidene chloride barrier coatings, and their thicknesses are all 1 to 5 μm.

[0011] Furthermore, a decorative pattern layer is provided on the outer surface of the face paper layer opposite to the back paper layer.

[0012] This invention provides a cigarette box with moisture-absorbing function, which is made of the aforementioned composite cardboard.

[0013] This invention provides a method for preparing a cigarette box with moisture-absorbing function, comprising the following steps: S1, coating a first barrier layer and a moisture-absorbing buffer layer onto the upper surface of a one-way permeable water vapor membrane, coating a functional isolation layer onto the lower surface of the one-way permeable water vapor membrane, and then cutting it into narrow widths of moisture-absorbing functional rolls and sealing them in time; S2, arranging multiple unwinders for loading moisture-absorbing functional rolls at equal intervals along a transverse direction perpendicular to the paper feeding direction, and arranging multiple coating wheels for coating the barrier layer in front of the paper feeding of each unwinder; coating an adhesive layer onto the opposite surfaces of the face paper layer and the bottom paper layer, and then assembling each moisture-absorbing functional roll between the face paper layer and the bottom paper layer at equal intervals to finally form a composite cardboard roll; S3, cutting the composite cardboard roll in S2 into single sheets of composite cardboard of the required size for cigarette box layout printing; S4, shaping the single sheets of composite cardboard in S3 into a cigarette box after positioning printing, die-cutting, creasing, and waste removal, with the bottom paper layer located on the inner side of the cigarette box.

[0014] Further, in S1, the preparation method of the moisture-absorbing functional roll material includes the following steps: S11, coating the functional isolation material onto the first side of the one-way permeable vapor membrane using a roll-to-roll process, and then drying it to form a functional isolation layer; S12, flipping the one-way permeable vapor membrane of S11 using a roll flipping mechanism so that the second side of the one-way permeable vapor membrane facing away from the functional isolation layer is facing upwards, then coating the second side of the one-way permeable vapor membrane with moisture-absorbing material, and then drying it to form a moisture-absorbing buffer layer; S13, coating the outer surface of the moisture-absorbing buffer layer of S12 with a barrier material, and then drying it to form a first barrier layer to isolate the odor, chemical activity and particle migration of the moisture-absorbing buffer layer, thereby preventing the moisture-absorbing buffer layer from deactivating; then cutting it into narrow widths of moisture-absorbing functional roll material; S14, placing the moisture-absorbing functional roll material of S13 into a sealed bag and then vacuum storing it.

[0015] Further, in S2, the preparation method of the composite cardboard roll includes the following steps: S21, the face paper roll and the bottom paper roll are respectively installed on two unloading mechanisms, and the tension of each is adjusted after the paper is threaded through; S22, multiple sets of first coating rollers and unwinders are arranged sequentially forward and backward along the paper feeding direction of the face paper roll, and a set of coating rollers larger than the width of the face paper roll is arranged between the first coating rollers and the unwinders, and each set of first coating rollers and unwinders are arranged at equal intervals in the transverse direction perpendicular to the paper feeding direction; a set of die-cutting rollers, multiple sets of second coating rollers, and a set of coating rollers are arranged sequentially forward and backward along the paper feeding direction of the bottom paper roll; wherein, the first coating rollers and the second coating rollers are used to coat the second barrier layer and the third barrier layer, respectively, the two sets of coating rollers are used to coat the adhesive layer on the opposite surface of the face paper roll and the bottom paper roll, the unwinder is used to unwind the moisture-absorbing roll, and the die-cutting roller is used to die-cut the paper into a thinner shape. Intermittent peel-off lines; S23, multiple sets of equally spaced third barrier layers are coated on the surface of the face paper roll along the paper feed direction, then an adhesive layer is fully coated on the third barrier layers, and then a moisture-absorbing roll is laminated onto the adhesive layer on the face paper roll, with the moisture-absorbing roll corresponding to the third barrier layer; S24, intermittent peel-off lines are die-cut at equal intervals along the paper feed direction of the bottom paper roll by a die-cutting roller to form each peel-off area, then a second barrier layer is coated on the inner surface of the bottom paper corresponding to each peel-off area, and then an adhesive layer is coated on the inner surface of the bottom paper, avoiding only the second barrier layer; multiple laser tracking marks are set on the outer surface of the bottom paper, and each laser tracking mark is located on the center line of the two intermittent peel-off lines along the paper feed direction; S25, the face paper roll of S23 and the bottom paper roll of S24 are laminated together with their respective adhesive layers to form a composite cardboard roll.

[0016] Furthermore, in S3, on the single-sheet cutting machine, the side of the laser tracking mark on the single-sheet composite card is facing upwards, and the first laser tracking mark on the single-sheet composite card is tracked by the laser tracking device. The single-sheet cutting blade then cuts along the line of the first laser tracking mark, and repeats until the last laser tracking mark in the layout, so as to ensure that each cigarette box corresponds to at least one lifting area.

[0017] Furthermore, in S3, a decorative pattern layer is printed on the outer surface of the face paper layer of a single-sheet composite cardstock to obtain a semi-finished cardstock for a cigarette box.

[0018] Furthermore, the one-way permeable water vapor membrane is a microporous PE membrane, a modified PE membrane, or a co-extruded PE membrane with one-way water vapor permeability, and its thickness is 10-20 μm.

[0019] Furthermore, the functional isolation layer is a coating formed by coating and drying a food-grade polyurethane dispersion, with a thickness of 1–5 μm.

[0020] Furthermore, the first barrier layer, the second barrier layer, and the third barrier layer are ethylene-ethylenedichloroethylene barrier enol copolymer barrier coatings or polyvinylidene coatings, and their thicknesses are all 1 to 5 μm.

[0021] The technical solution provided by this invention has the following beneficial effects: 1. This invention achieves controlled moisture absorption regulation after opening by coordinating the design of the moisture-absorbing functional unit and the opening triggering mechanism, while ensuring the integrity and safety of the packaging.

[0022] 2. By effectively isolating the moisture-absorbing buffer layer with the first barrier layer when it is not removed, the present invention can prevent the moisture-absorbing material from becoming inactive due to premature moisture absorption, thus significantly extending its effective service life.

[0023] 3. When the packaging is opened, by disrupting the local barrier structure, moisture inside the packaging is allowed to enter the moisture-absorbing buffer layer through the functional isolation layer and the one-way permeable moisture layer at a preset rate, thereby achieving buffering and regulation of the humidity inside the packaging and reducing the risk of quality deterioration of the packaged goods due to moisture absorption.

[0024] 4. This invention uses a prefabricated method to embed itself into the structure of the packaging paper, eliminating the need for additional independent moisture-proof components. Therefore, this invention is compatible with existing printing, lamination, and die-cutting processes, facilitating large-scale production and widespread application, and possesses good engineering practicality and industrialization value. Attached Figure Description

[0025] Figure 1 The diagram shown is a composite image of the moisture-absorbing unit in the embodiment. Figure 2 The diagram shown is a composite structure diagram of the corresponding peel-off area of ​​the composite cardstock in the embodiment; Figure 3 The diagram shown is a composite structure diagram of the composite cardboard outside the peel-off area in the embodiment. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 3This embodiment provides a cigarette case with moisture-absorbing function, including a cigarette case body, which includes a box body and a flip-top. The cigarette case body is formed by folding a composite cardboard (hereinafter referred to as composite cardboard) with a lift-up moisture-absorbing function. The composite cardboard is a coated cardboard. The flip-top is integrally connected to the box body through crease lines, and the flip-top is folded and opened / closed through the crease lines. Of course, in other embodiments, the box body and the flip-top can also be connected by adhesive or sleeve.

[0029] like Figure 2 As shown, the composite cardboard of this embodiment includes a face paper layer 1 and a back paper layer 2 arranged on top of each other, and at least one lift-up moisture-absorbing functional unit 100 disposed between the face paper layer 1 and the back paper layer 2. The lift-up moisture-absorbing functional unit 100 is disposed within the flip-top composite cardboard interlayer, as shown below. Figure 3 The outer paper layer 1 and the bottom paper layer 2 shown are mostly bonded together by the adhesive layer 7. The outer paper layer 1 corresponds to the outer side of the cigarette box body, and the bottom paper layer 2 corresponds to the inner side of the cigarette box body. The bottom paper layer 2 of the flip-top is provided with intermittent peel lines 21 corresponding to the moisture-absorbing functional unit 100. The intermittent peel lines 21 enclose a peelable area 22, so that after being fully peeled off, the moisture-absorbing functional unit 100 can actively absorb and dehumidify the moisture inside the cigarette box body. Of course, in other embodiments, composite cardboard can also be used for food packaging boxes or other packaging boxes that require moisture-proof treatment.

[0030] When the moisture-absorbing unit 100 is not in use, it is in a closed and isolated state. When it is needed, the bottom paper layer 2 in the corresponding peeling area 22 is peeled up along the intermittent peeling line 21 to expose the bottom paper layer 2, thereby facilitating subsequent moisture absorption.

[0031] Specifically, such as Figure 1 As shown, the lift-up moisture-absorbing functional unit 100 of this embodiment includes a first barrier layer 3, a moisture-absorbing buffer layer 4, a one-way water vapor permeable layer 5 and a functional isolation layer 6 arranged sequentially along its thickness direction (i.e. from top to bottom), wherein the first barrier layer 3 is close to the face paper layer 1 and the functional isolation layer 6 is close to the bottom paper layer 2.

[0032] The first barrier layer 3 is an ethylene-vinyl alcohol copolymer barrier coating or a polyvinylidene chloride barrier coating, both with a thickness of 1 to 5 μm. It is located between the moisture-absorbing buffer layer 4 and the face paper layer 1 and is used to isolate the odor, chemical activity and particle migration of the moisture-absorbing buffer layer 4, thereby preventing the moisture-absorbing buffer layer 4 from becoming inactive.

[0033] The moisture-absorbing material of the moisture-absorbing buffer layer 4 is selected from one or more of silica gel microparticles, molecular sieves, inorganic salt complexes, modified starch, modified cellulose, and high molecular weight moisture-absorbing resin. Its thickness is 50-100μm. It is used to actively absorb water vapor after the lifting area 22 is lifted, so as to form a buffer regulation of the humidity around it, that is, to suppress excessive humidity inside the cigarette box body.

[0034] The one-way permeable water vapor layer 5 is a microporous PE membrane, modified PE membrane, or co-extruded PE membrane with one-way air permeability, with a thickness of 10-20 μm, and is used to allow water vapor to pass through at a set rate.

[0035] The functional isolation layer 6 is a coating formed by coating and drying a food-grade polyurethane dispersion. Its thickness is 1-5 μm, and it is located between the base paper layer 2 and the one-way permeable water vapor layer 5, serving to isolate the moisture-absorbing buffer layer 4. Of course, the functional isolation layer 6 can also be used to isolate the moisture-absorbing buffer layer 4 from the packaged contents (such as cigarettes) inside the cigarette box body to avoid direct contact between the two.

[0036] Further preferably, a second barrier layer 8 is provided between the functional isolation layer 6 and the backing paper layer 2, and a third barrier layer 9 is provided between the face paper layer 1 and the adhesive layer 7 on the face paper layer 1. The coating areas of the second barrier layer 8 and the third barrier layer 9 both correspond to the area of ​​the moisture-absorbing functional unit 100 that is lifted (e.g., the areas of each functional layer are the same). Of course, the first barrier layer 3, the second barrier layer 8, and the third barrier layer 9 are made of the same material.

[0037] When the opening area 22 of the cigarette box body is not opened and is in a closed state, the first barrier layer 3 can effectively isolate the moisture-absorbing buffer layer 4 to prevent the moisture-absorbing material from becoming inactive due to premature moisture absorption, thereby significantly extending its effective service life.

[0038] When the lifting area 22 of the cigarette box body is completely removed, by destroying the local barrier structure (i.e., including the second barrier layer 8 and the adhesive layer 7 connected to it), the moisture inside the cigarette box body passes through the functional isolation layer 6 and the one-way permeable water vapor layer 5, and then enters the moisture-absorbing buffer layer 4 at a preset rate, thereby achieving buffering and regulation of the humidity inside the cigarette box body, and thus reducing the risk of quality deterioration of cigarettes due to moisture absorption.

[0039] In summary, this embodiment achieves structural switching between the closed state and the working state through the lifting structure, effectively preventing the moisture-absorbing material from failing prematurely before opening. Therefore, through the coordinated design of the lifting moisture-absorbing functional unit 100 and the lifting triggering mechanism, this embodiment achieves controlled moisture absorption regulation after opening while ensuring the integrity and safety of the packaging.

[0040] Furthermore, in this embodiment, the moisture-absorbing functional unit 100 is embedded into the structure of the packaging paper (i.e., composite cardboard) in a prefabricated manner, eliminating the need for additional independent moisture-proof components. Therefore, this embodiment is compatible with existing printing, lamination, and die-cutting processes, facilitating large-scale production and widespread application, and possesses good structural stability, engineering practicality, and industrialization value.

[0041] Of course, in other embodiments, one end of the lifting area 22 on the bottom paper layer 2 can also be connected to the flip cover so that it remains connected to the flip cover even after the lifting area 22 is partially opened.

[0042] Further preferred, such as Figure 2 and Figure 3 As shown, a decorative pattern layer 10 is provided on the outer surface of the face paper layer 1, opposite to the back paper layer 2, to enhance the overall aesthetics of the cigarette box. Of course, in other embodiments, the decorative pattern layer 10 is also optional.

[0043] In addition, such as Figure 2 As shown in the figure, this embodiment also provides a method for preparing a cigarette box with moisture-absorbing function, which specifically includes the following steps: Step S1: The first barrier layer 3 and the moisture-absorbing buffer layer 4 are coated on the upper surface of the one-way permeable vapor membrane 5' by the roll-to-roll process, and the functional isolation layer 6 is coated on the lower surface of the one-way permeable vapor membrane 5'. Then, according to the width required for the next process, it is cut into narrow-width moisture-absorbing functional rolls and the moisture-absorbing functional rolls are sealed and isolated in time.

[0044] In step S1, the specific preparation method of the moisture-absorbing functional roll material in this embodiment includes the following steps: Step S11: The functional isolation material is coated onto the first side of the one-way permeable water vapor membrane 5' using a roll-to-roll process, and then dried to form the functional isolation layer 6.

[0045] In step S12, the one-way permeable vapor membrane 5' coated with the functional isolation layer 6 is flipped over by the roll flipping mechanism so that the second side of the one-way permeable vapor membrane 5' facing away from the functional isolation layer 6 is facing upward. Then, a moisture-absorbing material is coated on the second side of the one-way permeable vapor membrane 5' and dried to form a moisture-absorbing buffer layer 4.

[0046] Step S13: A barrier material is coated on the outer surface of the moisture-absorbing buffer layer 4 on the one-way permeable water vapor membrane 5', and then dried to form the first barrier layer 3, so as to isolate the odor, chemical activity and particle migration of the moisture-absorbing buffer layer 4, thereby preventing the moisture-absorbing buffer layer 4 from becoming inactive. Then, it is cut into narrow-width moisture-absorbing functional rolls.

[0047] Step S14: After placing the processed moisture-absorbing roll into a sealed bag, vacuum-storage it to ensure its quality.

[0048] In step S2, multiple unwinders for loading moisture-absorbing rolls are set at equal intervals in a transverse direction perpendicular to the paper feeding direction, and multiple coating wheels for coating the barrier layer are set in front of the paper feeding of each unwinder; the adhesive layer 7 is coated on the opposite surfaces of the face paper layer 1 and the back paper layer 2 respectively, and then the moisture-absorbing rolls are laminated between the face paper layer 1 and the back paper layer 2 at equal intervals to finally form a composite cardboard roll.

[0049] In step S2, the specific preparation method of the composite cardboard roll material in this embodiment includes the following steps: Step S21: Install the face paper roll and the bottom paper roll on the two feeding mechanisms respectively, and adjust their tension after feeding the paper.

[0050] In step S22, multiple sets of first coating rollers and unwinders are arranged sequentially in front and behind along the paper feeding direction of the face paper roll. A coating roller larger than the width of the face paper roll is arranged between the first coating rollers and the unwinders. Each set of first coating rollers and unwinders is arranged at equal intervals in the transverse direction perpendicular to the paper feeding direction. A set of die-cutting rollers, multiple sets of second coating rollers, and a set of coating rollers are arranged sequentially in front and behind along the paper feeding direction of the bottom paper roll. The first coating rollers and the second coating rollers are used to coat the second barrier layer 8 and the third barrier layer 9, respectively. The two sets of coating rollers are used to coat the adhesive layer 7 on the opposite surfaces of the face paper roll and the bottom paper roll, respectively. The unwinder is used to unwind the moisture-absorbing roll. The die-cutting roller is used to die-cut the intermittent peel-off line 21.

[0051] Step S23: First, multiple sets of equally spaced third barrier layers 9 are coated on the surface of the face paper roll along the paper feeding direction. Then, the adhesive layer 7 is fully coated on the third barrier layer 9. After that, each moisture-absorbing roll is respectively bonded to the adhesive layer 7 on the face paper roll, and the attachment position of each moisture-absorbing roll corresponds to the area where each third barrier layer 9 is located.

[0052] In step S24, intermittent lifting lines 21 are die-cut at equal intervals along the paper feed direction of the base paper layer roll by a die-cutting roller to form each lifting area 22. Then, a second barrier layer 8 is coated on the inner surface of the base paper layer 2 corresponding to each lifting area 22. After that, an adhesive layer 7 is coated on the inner surface of the base paper layer 2, avoiding only the second barrier layer 8 (that is, the adhesive layer 7 corresponding to the second barrier layer 8 is partially hollowed out). Then, multiple laser tracking marks are set on the outer surface of the base paper layer 2, and each laser tracking mark is located on the center line of the two intermittent lifting lines 21 along the paper feed direction.

[0053] Step S25: The processed face paper roll and back paper roll are bonded together with their respective adhesive layers 7 to form a composite cardboard roll.

[0054] Step S3: Cut the processed composite cardboard roll into individual composite cardboard sheets of the required size for cigarette box printing. Alternatively, a decorative pattern layer 10 can be printed on the outer surface of the face paper layer 1 of the individual composite cardboard sheets using a positioning printing process to obtain semi-finished cigarette box cardboard.

[0055] In step S3, on the sheet-cutting machine, the side containing the laser tracking mark on the single sheet of composite cardstock is facing upwards. The laser tracking device tracks the first laser tracking mark on the single sheet of composite cardstock, and the single-sheet cutting blade then cuts along the line of the first laser tracking mark, repeating until the last laser tracking mark in the layout, to ensure that each cigarette box corresponds to at least one lifting area 22. Specifically, based on the layout structure of the cigarette boxes, the number of cigarette boxes in the paper feeding direction is calculated, and the corresponding number of laser tracking marks is set, ensuring that all laser tracking marks are identified one by one. This enables the single-sheet cutting blade to accurately cut along the lines of each laser tracking mark, completing the cutting operation that meets the sheet size requirements, until the entire roll of composite cardstock is cut into sheets.

[0056] Step S4: The processed single sheet of composite cardboard is die-cut, creasing and waste removal to form the cigarette box body, and the bottom paper layer 2 is located inside the cigarette box body.

[0057] Of course, in other embodiments, the composite cardboard can also be prepared by processing sheet to sheet; also, the third barrier layer 9 is an optional coating.

[0058] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A composite cardboard with a lift-up moisture-absorbing function, comprising a face paper layer and a back paper layer disposed on top and bottom, characterized in that: It also includes a lift-up moisture-absorbing functional unit disposed between the face paper layer and the back paper layer; The backing paper layer is provided with intermittent peel lines corresponding to the peel-up moisture-absorbing functional unit, and forms a peel-up area for exposing the peel-up moisture-absorbing functional unit to the backing paper layer. The moisture-absorbing functional unit is in a closed and isolated state when not in use, and includes a functional isolation layer, a one-way water vapor permeable layer, a moisture-absorbing buffer layer and a first barrier layer arranged sequentially along its thickness direction. The first barrier layer is located between the moisture-absorbing buffer layer and the face paper layer, and is used to isolate the odor, chemical activity and particle migration of the moisture-absorbing buffer layer, thereby preventing the moisture-absorbing buffer layer from becoming inactive; the functional isolation layer is located between the back paper layer and the one-way permeable water vapor layer, and is used to isolate the moisture-absorbing buffer layer; the moisture-absorbing buffer layer is used to actively absorb moisture after the peel-off area is peeled off, so as to form a buffer regulation setting for the humidity around it.

2. The composite cardboard with a lift-up moisture-absorbing function according to claim 1, characterized in that: The moisture-absorbing material of the moisture-absorbing buffer layer is selected from one or more of inorganic porous adsorbent materials, natural polymeric moisture-absorbing materials, and synthetic polymeric moisture-absorbing materials; wherein, the inorganic porous adsorbent materials include one or more of silica gel microparticles and molecular sieves; the natural polymeric moisture-absorbing materials include one or more of modified starch and modified cellulose; and the synthetic polymeric moisture-absorbing materials include one or more of cross-linked sodium polyacrylate resin and cross-linked polyvinyl alcohol moisture-absorbing resin; the thickness of the moisture-absorbing buffer layer is 50-100 μm.

3. The composite cardboard with a lift-up moisture-absorbing function according to claim 1, characterized in that: The one-way permeable water vapor layer is a microporous PE membrane, a modified PE membrane, or a co-extruded PE membrane with one-way water vapor permeability, and its thickness is 10-20 μm.

4. The composite cardboard with a lift-up moisture-absorbing function according to claim 1, characterized in that: The functional isolation layer is a coating formed by coating and drying a food-grade polyurethane dispersion, with a thickness of 1 to 5 μm.

5. The composite cardboard with a lift-up moisture-absorbing function according to any one of claims 1-4, characterized in that: The face paper layer and the back paper layer are respectively coated with an adhesive layer on their opposite surfaces; and the first barrier layer is close to the face paper layer, and the functional isolation layer is close to the back paper layer.

6. The composite cardboard with a lift-up moisture-absorbing function according to claim 5, characterized in that: A second barrier layer is provided between the functional isolation layer and the base paper layer; and / or, a third barrier layer is provided between the face paper layer and the adhesive layer on the face paper layer; the coating area of ​​the second barrier layer and / or the third barrier layer both correspond to the area of ​​the peel-off moisture-absorbing functional unit.

7. The composite cardboard with a lift-up moisture-absorbing function according to claim 6, characterized in that: The first barrier layer, the second barrier layer, and the third barrier layer are ethylene-vinyl alcohol copolymer barrier coatings or polyvinylidene chloride barrier coatings, and their thicknesses are all 1 to 5 μm.

8. The composite cardboard with a lift-up moisture-absorbing function according to any one of claims 1-4, characterized in that: The outer surface of the face paper layer, away from the back paper layer, is provided with a decorative pattern layer.

9. A cigarette case with moisture-absorbing function, characterized in that: It is made of composite cardboard as described in any one of claims 1-8.

10. A method for preparing a cigarette box with moisture-absorbing function, characterized in that, Includes the following steps: S1, the first barrier layer and the moisture-absorbing buffer layer are coated on the upper surface of the one-way permeable water vapor membrane, and the functional isolation layer is coated on the lower surface of the one-way permeable water vapor membrane. Then, it is cut into narrow widths of moisture-absorbing functional rolls and sealed and isolated in time. S2, multiple unwinders for loading moisture-absorbing rolls are set at equal intervals in a transverse direction perpendicular to the paper feeding direction, and multiple coating wheels for coating barrier layers are set in front of the paper feeding of each unwinder; the adhesive layer is coated on the opposite surfaces of the face paper layer and the back paper layer respectively, and then each moisture-absorbing roll is composited between the face paper layer and the back paper layer at equal intervals to finally form a composite cardboard roll; S3, cut the composite cardboard roll in S2 into single sheets of composite cardboard of the required size for cigarette box printing; S4 involves shaping the single-sheet composite cardboard from S3 into a cigarette box through positioning printing, die-cutting, creasing, and waste removal, with the bottom paper layer located on the inside of the cigarette box.

11. The preparation method according to claim 10, characterized in that: In S1, the preparation method of the moisture-absorbing functional roll material includes the following steps: S11, the functional isolation material is coated onto the first side of the one-way permeable water vapor membrane through a roll-to-roll process, and then dried to form a functional isolation layer; S12, the one-way water vapor permeable membrane of S11 is flipped by the roll flipping mechanism so that the second side of the one-way water vapor permeable membrane away from the functional isolation layer is facing upward. Then, a moisture-absorbing material is coated on the second side of the one-way water vapor permeable membrane and then dried to form a moisture-absorbing buffer layer. S13, a barrier material is coated on the outer surface of the moisture-absorbing buffer layer of S12, and then dried to form a first barrier layer to isolate the odor, chemical activity and particle migration of the moisture-absorbing buffer layer, thereby preventing the moisture-absorbing buffer layer from becoming inactive; then it is cut into narrow strips of moisture-absorbing functional rolls. S14. After placing the moisture-absorbing roll material from S13 into a sealed bag, vacuum it for storage.

12. The preparation method according to claim 11, characterized in that: In S2, the method for preparing the composite cardboard roll includes the following steps: S21, Install the face paper roll and the bottom paper roll on the two feeding mechanisms respectively, and adjust their tension after feeding the paper; S22, multiple sets of first coating rollers and unwinders are arranged sequentially in front and back along the paper feeding direction of the face paper layer roll. A coating roller larger than the width of the face paper layer roll is arranged between the first coating rollers and the unwinders. Each set of first coating rollers and unwinders is arranged at equal intervals in the transverse direction perpendicular to the paper feeding direction. A die-cutting roller, multiple sets of second coating rollers, and a coating roller are arranged sequentially in front and back along the paper feeding direction of the bottom paper layer roll. The first coating roller and the second coating roller are used to coat the second barrier layer and the third barrier layer, respectively. The two sets of coating rollers are used to coat the adhesive layer on the opposite surfaces of the face paper layer roll and the bottom paper layer roll, respectively. The unwinder is used to unwind the moisture-absorbing roll. The die-cutting roller is used to die-cut the intermittent peel-off line. S23, multiple sets of equally spaced third barrier layers are coated on the surface of the face paper roll along the paper feeding direction. Then, an adhesive layer is fully coated on the third barrier layer. After that, a moisture-absorbing roll is laminated onto the adhesive layer on the face paper roll, and the moisture-absorbing roll corresponds to the third barrier layer. S24, intermittent lifting lines are die-cut at equal intervals along the paper feed direction of the base paper layer roll by a die-cutting roller to form each lifting area. Then, a second barrier layer is coated on the inner surface of the base paper layer corresponding to each lifting area. After that, an adhesive layer is coated on the inner surface of the base paper layer, avoiding only the second barrier layer. Multiple laser tracking marks are set on the outer surface of the base paper layer, and each laser tracking mark is located on the center line of the two intermittent lifting lines along the paper feed direction. S25, the face paper roll of S23 and the bottom paper roll of S24 are bonded together with their respective adhesive layers to form a composite cardboard roll.

13. The preparation method according to claim 10, characterized in that: In S3, on the single-sheet cutting machine, the side of the laser tracking mark on the single-sheet composite card is facing upwards, and the laser tracking device tracks the first laser tracking mark on the single-sheet composite card. The single-sheet cutting blade then cuts along the line of the first laser tracking mark, and repeats until the last laser tracking mark in the layout, so as to ensure that each cigarette box corresponds to at least one lifting area.

14. The preparation method according to any one of claims 10-13, characterized in that: In S3, a decorative pattern layer is positioned and printed on the outer surface of the face paper layer of a single composite cardstock to obtain a semi-finished cardstock for a cigarette box.

15. The preparation method according to any one of claims 10-13, characterized in that: The one-way permeable water vapor membrane is a microporous PE membrane, a modified PE membrane, or a co-extruded PE membrane with one-way water vapor permeability, and its thickness is 10-20 μm.

16. The preparation method according to any one of claims 10-13, characterized in that: The functional isolation layer is a coating formed by coating and drying a food-grade polyurethane dispersion, with a thickness of 1 to 5 μm.

17. The preparation method according to claim 12, characterized in that: The first barrier layer, the second barrier layer, and the third barrier layer are ethylene-vinyl alcohol copolymer barrier coatings or polyvinylidene chloride barrier coatings, and their thicknesses are all 1 to 5 μm.

Images