WO2023083061A1

WO2023083061A1 - Sealing structure for packaging box, production process for sealing structure, and packaging box

Info

Publication number: WO2023083061A1
Application number: PCT/CN2022/129131
Authority: WO
Inventors: 毕瀚森
Original assignee: 瀚森恒业(北京)商业有限公司
Priority date: 2021-11-15
Filing date: 2022-11-02
Publication date: 2023-05-19
Also published as: CN114030762A

Abstract

A sealing structure for a packaging box, a production process for a sealing structure, and a packaging box. The sealing structure comprises: a pull piece (1), an inner membrane (5) and a plug sheet (2), wherein the pull piece covers an outer side of an opening on a packaging box, the area of the pull piece is greater than that of the opening, and the plug sheet matches the shape of the opening and corresponds to the position of the opening; the inner membrane covers an inner side of the opening, and the area of the inner membrane is greater than that of the opening; the pull piece enables the inner membrane to be broken at the opening under the action of an external force, so as to open the opening; and the plug sheet can be embedded in the opening under the action of an external force, so as to close the opening. By providing the sealing structure on a packaging box, an opening of the packaging box can be repeatedly opened and closed, thereby effectively reducing the usage amount of plastic, which is more environmentally friendly, and reducing the manufacturing cost.

Description

The sealing structure of the packaging box, the production process of the sealing structure and the packaging box

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202111348620.0 filed on November 15, 2021, and the application title is "sealing structure of packaging box, production process of sealing structure and packaging box", the entire content of which Incorporated in this application by reference.

technical field

The invention belongs to the technical field of product packaging, and in particular relates to a sealing structure of a packaging box, a production process of the sealing structure and a packaging box.

Background technique

Non-carbonated liquid food, such as drinking water, milk and yogurt, and semi-liquid food, such as juice, are widely sold in three-dimensional packaging boxes. Packaging boxes for liquid or semi-liquid food are usually made of paper-based composite packaging materials, which are composed of paper base layers, barrier layers (such as aluminum foil), waterproof layers, and innermost layers. The waterproof layer covers the outermost side of the composite packaging material, which can provide waterproof and dustproof performance; the paper base layer can provide stiffness for the composite packaging material; the barrier layer can block oxygen, thereby prolonging the shelf life of liquid food such as liquid milk or juice. When filling drinking water such as mineral water and purified water, the barrier layer may not be included in the composite packaging material. After the composite packaging material is produced, it is transported from the packaging material production enterprise to the food filling enterprise, and the composite packaging material is processed by the filling machine in the filling enterprise to form a liquid food packaging box through multiple processes such as filling, sealing, and shaping.

Liquid food packaging boxes usually adopt one-time sealing, or use plastic packaging cover to seal. Plastic packaging lids not only have high production costs, but also generate a large amount of plastic waste that is difficult to degrade, which brings a heavy burden to the environment. The one-time seals used in liquid food packaging boxes, such as easy-to-pull stickers, have the advantages of easy opening and low cost, and are very suitable for liquid food packaging, especially small-capacity liquid food packaging. The pull sticker can only be opened once, and the opening cannot be closed again after opening, and cannot be reused, so that the liquid food packaging box with the easy pull sticker cannot be opened immediately for drinking and is not easy to carry.

application content

In view of the above problems, the present invention discloses a sealing structure of a packaging box, a production process of the sealing structure and a packaging box, so as to overcome the above problems or at least partly solve the above problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

On the one hand, the application discloses a sealing structure of a packaging box. The packaging box is made of a composite packaging material. The composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer. The sealing structure includes: a pull tab, an inner film and a sealing flakes;

The pull-tab covers the outer side of the opening on the packaging box, and the area of the pull-tab is larger than the area of the opening. The sealing sheet matches the shape of the opening and corresponds to the position of the opening; the inner film covers the inner side of the opening, and the area of the inner film is larger than the opening area;

Under the action of external force, the pull tab can cause the inner membrane to rupture at the opening to realize the opening of the opening;

The blocking sheet can be embedded in the opening under the action of external force to realize the sealing of the opening.

Further, the blocking sheet is located on the inner surface of the pull-tab, and the inner membrane is fixedly connected with the blocking sheet.

Further, the blocking sheet is located on the outer surface of the pull-tab, and the inner film is fixedly connected to the pull-tab.

Further, the occluding thin piece is located on the inner surface of the inner membrane, and the pull piece is fixedly connected with the inner membrane.

Further, the sealing structure further includes an outer film, the outer film is arranged on the outer side of the opening, and the pull tab is arranged on the outer side of the outer film.

Further, the area of the outer membrane is smaller than the area of the pull tab or the length of the outer membrane is shorter than the length of the pull tab, and the pull tab part is fixedly connected with the outer membrane.

Further, the sealing sheet is made of plastic, paper, paper-plastic composite material, or biodegradable biomaterial.

Further, the pull tab is a composite material including a barrier material and a fusible material, the barrier material is at least one of aluminum foil or barrier paper, and the fusible material is at least one selected from plastic, PLA or PBAT.

Further, the inner film is a PE film or a composite film.

Further, the edge of the plugging sheet is chamfered or provided with a bevel.

Further, several horizontal arc-shaped protrusions or arc-shaped grooves are provided on the inclined surface.

Further, the thickness of the sealing sheet is 1/8-8 times of the thickness of the base layer of the composite packaging material.

Further, the thickness of the blocking sheet is 2-4 times the thickness of the base layer of the composite packaging material.

Further, the thickness of one side of the blocking sheet is smaller than the thickness of the other side, and the pull-tab is pulled from the side of the blocking sheet with a smaller thickness.

Further, the sealing structure also includes a connecting part, which connects the composite packaging material and the pull tab or the sealing sheet.

Further, the sealing structure also includes a connecting part, the connecting part is the end of the pull tab, and the end of the pull tab is connected with the composite packaging material.

Further, the sealing structure further includes a connecting part, one end of the connecting part is fixedly connected to the inner membrane or the innermost layer near the inside of the opening, and the other end is fixedly connected to the blocking sheet.

Further, the blocking sheet is a hollow structure and/or the middle part of the blocking sheet has an opening.

Further, the blocking sheet is recessed toward the opening side to form a recess.

Further, the recess of the blocking sheet has openings.

Another aspect of the present application discloses a production process for the sealing structure of a packaging box. The production process includes the following steps:

Step S1: punching the composite packaging material to form an opening;

Step S2: setting an inner film and a pull tab on the inner side and outer side of the opening respectively, and the areas of the inner film and the pull tab are larger than the area of the opening;

Step S3: setting a blocking sheet on the pull tab or the inner membrane, the blocking sheet matches the shape of the opening and corresponds to the position of the opening;

Step S4: The inner membrane, the sealing sheet and the pull-tab are fixedly connected by a heat-sealing process or an adhesive process, so that the pull-tab can rupture the inner membrane at the opening under the action of an external force to realize the opening of the opening; When the plugging sheet is pressed, the plugging sheet can be inserted into the opening to realize the sealing of the opening.

Further, the production process also includes:

providing an adventitia outside the opening; or,

An outer film is arranged on the outer side of the composite packaging material, and holes are punched in the area covered by the outer film to form openings.

Another aspect of the present application discloses a sealing structure of a packaging box. The packaging box is made of a composite packaging material. The composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer. The sealing structure includes: an inner film and a sealing sheet , the inner membrane is fixedly connected with the occlusion sheet;

The blocking sheet matches the shape of the opening and corresponds to the position of the opening; the inner membrane covers the inner side of the opening, and the area of the inner membrane is larger than that of the opening;

Under the action of external force, the blocking sheet can cause the inner membrane to rupture at the opening and realize the opening of the opening;

Further, the blocking sheet is recessed toward the opening side to form a recess, and has an edge larger than the opening and parallel to the opening, and the edge is used to cover the outside of the opening on the packaging box.

Another aspect of the present application discloses a sealing structure of a packaging box, the packaging box is made of a composite packaging material, the composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer, and the sealing structure includes: an inner membrane and a blocking sheet, the inner membrane is fixedly connected to the blocking sheet;

Under the action of external force, the blocking sheet can cause the inner membrane to rupture at the opening, so as to realize the opening of the opening;

The blocking sheet can be inserted into the opening under the action of external force to realize the sealing of the opening;

The blocking sheet is recessed toward the opening side to form a recess, and has an edge that is larger than the opening and parallel to the opening, and the edge is used to cover the outer side of the opening on the packaging box, and the recess has an opening. hole.

Another aspect of the present application discloses a packaging box, which is provided with any one of the above-mentioned sealing structures.

The advantages and beneficial effects of the application are:

In the sealing structure of the present application, a sealing sheet matching the shape of the opening is arranged at the opening position of the composite packaging material, and an external force acts on the pull-tab or sealing sheet provided on the outside of the opening, so that the inner film inside the opening position is closed in the packaging box. The opening is broken to realize the opening of the opening; the sealing sheet can be embedded in the opening under the action of external force, and the sealing sheet and/or pull sheet can realize the sealing of the opening, and then the opening and closing of the packaging box can be repeatedly opened and closed to block the sheet Compared with the traditional opening method, it effectively reduces the amount of plastic used, is more environmentally friendly, and reduces production costs.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is the longitudinal sectional view of a kind of sealing structure in the embodiment 1 of the present application;

Fig. 2 is the longitudinal sectional view of another kind of sealing structure in the embodiment 1 of the present application;

Fig. 3 is a longitudinal sectional view of the sealing structure in Example 2 of the present application;

Fig. 4 is the longitudinal sectional view of sealing structure in the embodiment 3 of the present application;

Fig. 5 is a longitudinal sectional view of another sealing structure in Embodiment 3 of the present application;

Fig. 6 is a longitudinal sectional view and a top view of yet another sealing structure in Embodiment 3 of the present application;

Fig. 7 is a longitudinal sectional view and a top view of yet another sealing structure in Embodiment 3 of the present application;

Fig. 8 is a longitudinal sectional view of the sealing structure in which the upper and lower edges of the plugging sheet are provided with slopes in Example 4 of the present application;

Fig. 9 is a longitudinal sectional view of a sealing structure with chamfered upper and lower edges of the plugging sheet in Example 4 of the present application;

Fig. 10 is a longitudinal sectional view of a sealing structure with an inclined surface on the upper edge of the sealing sheet in Example 4 of the present application;

Fig. 11 is a longitudinal sectional view of another sealing structure with a beveled surface on the upper edge of the sealing sheet in Example 4 of the present application;

Fig. 12 is a longitudinal sectional view of the sealing structure provided with connecting parts on the plugging sheet in Example 4 of the present application;

Fig. 13 is a production process implementation step diagram of a packaging box sealing structure in Example 5 of the present application;

Fig. 14 is a production process implementation step diagram of another packaging box sealing structure in Example 5 of the present application;

Fig. 15 is a production process implementation step diagram of another packaging box sealing structure in Example 5 of the present application;

Fig. 16 is a longitudinal sectional view of a sealing structure in Embodiment 6 of the present application;

Fig. 17 is a longitudinal sectional view and a top view of another sealing structure in Embodiment 6 of the present application.

In the figure: 1. pulling tab; 2. sealing sheet; 3. composite packaging material; 4. opening; 5. inner film; 6. outer film; 7. arc-shaped groove; 8. connecting part.

specific embodiment

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The technical solutions provided by various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1

This embodiment discloses a sealing structure of a packaging box. The packaging box is made of a composite packaging material, and the composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer. Among them, the base layer of the composite packaging material generally adopts base paper, such as white bottom paper or kraft bottom paper, which can provide the necessary stiffness for the composite packaging material, so that the packaging box maintains a stable shape. The barrier layer is crucial to the composite packaging material used for liquid food packaging, which plays a key role in the shelf life of liquid food, oxygen penetration is the main cause of the deterioration of the packaging content of food packaging, the barrier layer prevents oxygen from penetrating into the packaging container In order to extend the shelf life of food, aluminum foil is usually used as a barrier layer in composite packaging materials. The waterproof layer is generally thermoplastic resin, preferably polyolefin, including but not limited to low density polyethylene (Low Density Polyethylene, LDPE), metallocene polyethylene (m-PE) or a mixture of the two. The waterproof layer is located on the outermost side of the composite packaging material, which can provide waterproof and dustproof performance, and protect the printed graphics of the composite packaging material from being worn. The innermost layer of the composite packaging material is in direct contact with the package contents. The innermost layer is generally a thermoplastic resin, preferably containing polyolefin, such as polyethylene (Polyethylene, PE), including but not limited to linear low density polyethylene (Linear Low Density Polyethylene, LLDPE), ultra-low density polyethylene, low density polyethylene , metallocene polyethylene or a mixture thereof. There is generally an adhesive layer between the base layer and the barrier layer, the barrier layer and the innermost layer. The adhesive layer plays the role of bonding between two adjacent layers. Generally, an adhesive polymer layer is used, such as modified Polypropylene based thermoplastic adhesive polymer. The packaging box is provided with an opening as an outlet for the packaging content to flow out or drink. The opening is realized by punching holes in the composite packaging material, and a sealing structure is correspondingly provided at the position of the opening to close the opening.

As shown in FIG. 1 , the sealing structure of this embodiment includes: a pull tab 1 , an inner membrane 5 and a sealing sheet 2 .

The pull tab 1 covers the outer side of the opening 4 on the composite packaging material 3 , unless otherwise specified in this application, the outer side refers to the side facing the outside air, and the inner side refers to the side facing the package contents. The area of the pull tab 1 is larger than the area of the opening 4 . Pull tab 1 is generally made of composite material, which may be a composite material including a barrier material and a fusible material. The barrier material is at least one of aluminum foil or barrier paper, and the fusible material is at least one selected from plastics, PLA or PBAT. kind. For example, the pull sheet 1 is a composite of barrier paper (such as nanocellulose paper) and PE or a composite of aluminum foil and PE. Among them, barrier paper or aluminum foil can also be used LDPE (Low-density Polyethylene, low-density polyethylene), HDPE (High Density Polyethylene, high-density polyethylene), PP (Polypropylene, polypropylene), PA (Polyamide, polyamide), PLA (Polylactic Acid, polylactic acid) or PBAT (Butyleneadipate-co-terephthalate, polyadipate-co-terephthalate), paper and other materials instead. The pull-tab 1 made of aluminum foil can be fixed by electric heating, and the PE in the pull-tab 1 is melted when heated by electric heating, and the pull-tab 1 is fixed and bonded to the composite packaging material 3. PE can also be made of PP , PA, PLA or PBAT and other alternatives. The pull-tab 1 that does not include aluminum foil in the preparation material can be fixed on the composite packaging material 3 by gluing.

The inner membrane 5 covers the inner side of the opening 4 , and the area of the inner membrane 5 is larger than that of the opening 4 . The inner film 5 can be a PE (Polyethylene, polyethylene) film or a composite film, such as laminating PE on both sides of an EVOH (Ethylene vinyl alcohol copolymer, ethylene/vinyl alcohol copolymer) material, with an adhesive between EVOH and PE Bonding to form a composite material of PE/adhesive/EVOH/adhesive/PE. Among them, EVOH can also be replaced by PVOH (Polyvinyl Alcohol, polyvinyl alcohol), PVDC (Poly-vinylidene Chloride, polyvinylidene chloride), PA (Polyamide, polyamide) or Al ₂ O ₃ and other metal oxides. , so that the inner film 5 made of the composite material has a certain barrier performance, which can prolong the shelf life of the package contents.

In this embodiment, as shown in FIG. 1, the blocking sheet 2 is located inside the pull tab 1, and the part of the inner film 5 other than the opening 4 is attached to the innermost layer of the composite packaging material 3. The membrane 5 is fixedly connected with the blocking sheet 2, that is, the blocking sheet 2 is located between the pulling sheet 1 and the inner membrane 5, and there may be an opening in the middle of the blocking sheet, and the size of the opening is not limited, and the blocking sheet can be embedded under the action of external force For the opening, the blocking sheet and the pulling tab jointly realize the sealing of the opening.

The material of the plugging sheet 2 is plastic, paper, paper-plastic composite material, or biodegradable biomaterial; the plugging sheet 2 can be made of an injection-molded material, such as plastic, specifically PE, preferably LDPE, HDPE, or PP, PA , PLA or PBAT, etc., or a combination of several, such as the combination of PE/PLA; the prepared plugging sheet 2 can be solid or hollow, as long as the shape of the plugging sheet 2 matches the opening 4, Its material strength is enough to close the opening 4. The hollow sealing sheet can not only further reduce plastic, but also has better stretching elasticity, and can better seal the opening after being embedded. The plugging sheet 2 can also be made of paper or a composite of paper and plastic; of course, the plugging sheet 2 can also be made of other materials, such as wood, bamboo, etc., which are also within the protection scope of the present application. Make the plugging sheet 2 into shape, and then fix it on the pull piece 1. When the plugging sheet 2 is made of plastic or other injectable material, you can first make the plugging sheet 2 into shape, and then fix it on the inner side of the pull piece 1 to seal The sheet 2 can also be directly injection-molded on the inner side of the pull-tab 1 , and then the pull-tab 1 with the blocking sheet 2 is fixed on the composite packaging material 3 . During production, the pull tab 1, the plugging sheet 2 and the inner membrane can be made of different materials, and then combined by heat sealing or bonding; the pull tab 1, the plugging sheet 2 and the inner membrane 5 can also use the same Material preparation, at this time, in this embodiment, the pull-tab 1 and the plugging sheet 2 can also be integrally prepared and molded.

Specifically, the blocking sheet 2 is fixed on the pull-tab 1, the shape of the blocking sheet 2 matches the opening 4, and corresponds to the position of the opening 4, one side of the blocking sheet 2 is fixedly connected to the pull-tab 1, and the blocking sheet 2 The other side of the top is fixedly connected with the inner membrane 5. Under the action of external force, such as when the pull-tab 1 is opened or the pull-tab 1 is pressed, the binding force between the blocking sheet 2 and the pull-tab 1, as well as the sealing force between the blocking sheet 2 and the inner membrane The bonding force between 5 is greater than the tear strength of the inner membrane 5, so that the inner membrane 5 at the position of the opening 4 is torn, and the opening 4 is opened, and the liquid can be poured out from the opening 4 at this time. Tear strength refers to the force required to tear the inner membrane 5 . After opening, the blocking sheet 2 can be pulled out from the opening 4 and/or pushed back, for example, pressing the blocking sheet 2 to fit into the opening 4 to realize the sealing of the opening 4 . In order to make the plugging sheet 2 better close the opening 4, the overall size of the plugging sheet 2 can be slightly larger than the opening 4, or the local size of the plugging sheet 2 is slightly larger than the opening 4, so that the gap between the plugging sheet 2 and the opening 4 The edge contact is tighter, which effectively prevents the liquid in the box from flowing out. Holes can be provided in the middle of the plugging sheet 2, and the openings can further reduce the plastic consumption of the plugging sheet 2, making it more in line with the requirements of environmental protection and plastic reduction. If the plugging sheet 2 is provided with openings, before the opening 4 is opened or after it is closed again, the plugging sheet 2 mainly realizes the sealing of the opening 4 through the tight closure between its outer edge and the inner edge of the opening 4, and at the same time The opening part is closed by the fixed connection of the blocking sheet 2 and the pull tab 1 . The plugging sheet 2 can also be a hollow structure and an opening is provided in the middle of the plugging sheet 2 . The hollow structure of the plugging sheet 2 and the opening in the middle part can further reduce the amount of plastic used in the plugging sheet 2, and can also make the plugging sheet have better stretching and elasticity. Good to close the opening.

As shown in Figure 1, the sealing structure can also include: an outer film 6, the outer film 6 is arranged on the outside of the opening 4, and the pull tab 1 is arranged on the outer side of the outer film 6; the outer film 6 can be PE (Polyethylene, polyethylene), the outer The film 6 can also be made of a composite material of OPP (Oriented Polypropylene, stretched polypropylene) and PE, wherein OPP can also be replaced by polyester materials such as HDPE, PP, PET/PBT. Before punching, the outer film 6 can be set at the pre-punched position of the composite packaging material 3 in advance, and the opening 4 is formed by punching in the area covered by the outer film 6, and the area of the opening 4 is smaller than the area of the outer film 6; or, It is also possible to punch holes on the composite packaging material 3 earlier, and set an outer film 6 on the outer side of the composite packaging material 3 at the punching position. The area of the outer film 6 will be greater than the area of the opening 4, so that the outer film 6 completely covers the opening 4. Its specific structure See Figure 2. When the pull-tab 1 includes aluminum foil, the pull-tab 1 is heated by electric heating, so that the pull-tab 1 and the outer film 6 are bonded and fixed on the composite packaging material 3 . The outer film 6 can prevent the composite packaging material 3 from being damaged when the pull tab 1 is pulled up due to the strong binding force between the pull tab 1 and the composite packaging material 3 when it is opened. If the outermost layer of the composite packaging material 3 is a material such as OPP, the outer film may not be needed, because the composite packaging material 3 will not be torn due to the force that separates the pull tab 1 from materials such as OPP after bonding. In addition, considering the positioning error during the process, the width of the pull tab 1 can be set to be slightly narrower than that of the outer film 6 .

Preferably, the pull tab 1 is only partially attached to the outer film 6. At this time, at least part of the pull tab 1 is not fixed on the composite packaging material 3, so that the area of the outer film 6 can be smaller than the area of the pull tab 1, or the outer film 6 The length of the pull tab 1 is less than the length of the pull tab 1, and the unfixed part of the pull tab 1 is convenient for lifting the pull tab 1 when it is opened.

Further, the sealing structure may also include a connecting part, which is used to prevent the pull tab 1 from completely detaching from the packaging box after opening. The connecting part can be a connecting belt or a connecting strip. For example, the connecting part can be integrally injection-molded with an injection-molding material and the blocking sheet 2, and the blocking sheet 2 is fixed on the pull tab 1, and the connecting part is fixed on the composite packaging material 3; The plugging sheet 2 and the connecting part can be prepared separately, and then one end of the connecting part is fixed to the pulling tab 1 or the plugging sheet 2 by means of glue or hot melt, and the other end of the connecting part is fixed on the composite packaging material 3 .

It is also possible to set the end of the pull tab 1 as a connecting part, and glue or fix one end of the pull tab 1 on the composite packaging material 3. When the pull tab 1 is lifted from the other end, it still remains connected to the packaging box. Prevent the pull tab 1 from completely detaching from the packaging box, so that the opened blocking sheet 2 is easier to store and install back on the opening 4 .

The connecting part can also be a part of the composite packaging material 3, such as when the composite packaging material 3 is punched to form the opening 4, the composite packaging material 3 at the perforated position is not completely cut off, and the cut composite packaging material 3 is opened toward the opening. The outer side is lifted and connected to the pull tab 1. If it is connected to the outside of the pull tab 1, the blocking sheet 2 on the inside of the pull tab 1 is bonded to the inner film 5 to close the opening 4. After opening, the pull tab 1 can still pass through the cut. The composite packaging material 3 is connected with the packaging box. In addition, the connecting part can also be a limit or buckle mechanism formed by injection molding on the composite packaging material 3. The connecting part makes the opened pull tab 1 still directly or indirectly connected with the packaging box, which is more convenient to realize the closure of the sheet 2. Repeated opening of opening 4.

Example 2

This embodiment discloses a sealing structure of a packaging box. The difference from the foregoing embodiment 1 is that, as shown in FIG. Opening 4.

Attach the pull tab 1 to the position outside the opening 4 of the composite packaging material 3, so that the waterproof layer of the pull tab 1 and the composite packaging material 3 outside the opening 4 are attached; if the opening 4 is also provided with an outer film 6, the pull tab 1 and The outer membrane 6 on the outside of the opening 4 is attached. If the prepared pull-tab 1 includes aluminum foil, the pull-tab 1 can be heated by electric heating, so that the inner film 5 is attached to the pull-tab 1 at the position of the opening 4, and the part of the inner film 5 outside the opening 4 is combined with the inner side of the opening 4 The innermost layer of packaging material 3 is applied so as to seal the opening 4 .

The material of the plugging sheet 2 is plastic, paper, paper-plastic composite material, or biodegradable biomaterial; the plugging sheet 2 can be made of an injection-molded material, such as plastic, specifically PE, preferably LDPE, HDPE, or PP, PA , PLA or PBAT, etc., or any combination of several, such as the combination of PE/PLA. The pull tab 1 can be fixed on the outside of the opening 4 first, and then the plug sheet 2 can be formed by injection molding on the pull tab 1 or the pre-prepared plug sheet 2 can be bonded; or the plug sheet 2 can be injected or bonded first. The method is pre-fixed on the outer surface of the pull tab 1, and then the inner side of the pull tab 1 is attached to the outer side of the opening 4 of the composite packaging material 3. The prepared plugging sheet 2 can be solid or hollow, as long as the shape of the plugging sheet 2 matches the opening 4 and its material strength is sufficient to close the opening 4 . During production, the pull tab 1, the blocking sheet 2 and the inner membrane 5 can be made of different materials, and then combined together by heat sealing or bonding; In this case, the pulling tab 1 and the plugging sheet 2 can also be integrally prepared in this embodiment. Holes can be provided in the middle of the plugging sheet 2, and the openings can further reduce the amount of plastic used in the plugging sheet 2, making it more in line with the requirements of environmental protection and plastic reduction. If the plugging sheet 2 is provided with openings, before the opening 4 is opened or after it is closed again, the plugging sheet 2 mainly realizes the sealing of the opening 4 through the tight closure between its outer edge and the inner edge of the opening 4, and at the same time The opening part is closed by the fixed connection of the blocking sheet 2 and the pull tab 1 . The plugging sheet 2 can also be a hollow structure and an opening is provided in the middle of the plugging sheet 2 . The hollow structure of the plugging sheet 2 and the opening in the middle part can further reduce the amount of plastic used in the plugging sheet 2, and can also make the plugging sheet have better stretching and elasticity. Good to close the opening.

Under the action of external force, such as lifting the pull-tab 1 or pressing the pull-tab 1, the inner membrane 5 is ruptured at the opening 4 to realize the opening of the opening 4 . When opening, the binding force between the blocking sheet 2 and the pull piece 1, and the binding force between the pull piece 1 and the inner membrane 5 are greater than the tear strength of the inner membrane 5, so that the inner membrane 5 at the opening 4 is torn. crack. After opening, the blocking sheet 2 can be pulled out from the opening 4 and/or pushed back, and the blocking sheet 2 can be inserted into the opening 4 by pressing to realize the sealing of the opening 4 .

Preferably, as shown in Figure 3, the sealing structure can also include: an outer film 6, the outer film 6 is arranged on the outside of the opening 4, and the pull tab 1 is arranged on the outer side of the outer film 6; the outer film 6 can be PE (Polyethylene, polyethylene ), the outer film 6 can also be prepared by a composite material of OPP (Oriented Polypropylene, stretched polypropylene) and PE, wherein OPP can also be replaced by polyester materials such as HDPE, PP, PET/PBT. Before punching, the outer film 6 can be set at the pre-punched position of the composite packaging material 3 in advance, and the opening 4 is formed by punching in the area covered by the outer film 6, and the area of the opening 4 is smaller than the area of the outer film 6; or, It is also possible to punch holes on the composite packaging material 3 earlier, and an outer film 6 is set on the outer side of the composite packaging material 3 at the punching position. When the pull-tab 1 includes aluminum foil, the pull-tab 1 is heated by electric heating, so that the pull-tab 1 and the outer film 6 are bonded and fixed on the composite packaging material 3 . The outer film 6 can prevent the composite packaging material 3 from being damaged when the pull tab 1 is pulled up due to the strong binding force between the pull tab 1 and the composite packaging material 3 when it is opened. In addition, considering the positioning error during the process, the width of the pull tab 1 can be set to be slightly narrower than that of the outer film 6 .

Further, the sealing structure may also include a connecting part, which is used to prevent the pull tab 1 from completely detaching from the packaging box after opening. The connecting part can be a connecting belt or a connecting strip. For example, the connecting part can be integrally injection-molded with an injection-molding material and the blocking sheet 2, and the blocking sheet 2 is fixed on the pull tab 1, and the connecting part is fixed on the composite packaging material 3; It is also possible to attach the pull tab 1 on the composite packaging material 3 or the outer film 6, and then injection mold the pull tab 1 to form the blocking sheet 2 and the connecting parts, and fix the connecting parts on the composite packaging material 3; The plugging sheet 2 and the connecting part can be prepared separately, and then one end of the connecting part is fixed to the pulling tab 1 or the plugging sheet 2 by means of glue or hot melt, and the other end of the connecting part is fixed on the composite packaging material 3 .

It is also possible to set the end of the pull tab 1 as a connecting part, and bond or fix one end of the pull tab 1 on the composite packaging material 3. When the pull tab 1 has never been bonded or fixed on the composite packaging material 3 After one end is lifted, it still remains connected with the packing box to prevent the pulling tab 1 from completely detaching from the packing box, so that the opened blocking sheet 2 is easy to store and install back on the opening 4 .

The connecting part can also be a part of the composite packaging material 3, such as when the composite packaging material 3 is punched to form the opening 4, the composite packaging material 3 at the perforated position is not completely cut off and separated, and the cut composite packaging material 3 is The outer side of the opening is lifted and connected to the pull tab 1 or the blocking sheet 2. At the opening 4, the pull tab 1 fits the inner film 5 to close the opening 4. After opening, the pull tab 1 or the sealing sheet is opened through the cut composite packaging material 3. The blocking sheet 2 is connected with the packing box. In addition, the connection part can also be in the form of a limit or buckle mechanism formed by injection molding on the composite packaging material 3, so that the opened pull tab 1 is still directly or indirectly connected to the packaging box can be regarded as a connection part.

To sum up, in the sealing structure of the foregoing embodiments, the pull tab 1 is provided on the outside of the opening 4 on the composite packaging material 3, and the blocking sheet 2 matching the shape of the opening 4 is provided on the inside or outside of the pull tab 1 , under the action of external force, the inner membrane 5 is broken at the opening 4 to realize the opening of the opening 4, and the sealing sheet 2 can be pulled out and/or pushed back from the opening 4 under the action of external force, thereby realizing repeated opening and closing of the package The opening 4 of the box effectively reduces the amount of plastic used, is more environmentally friendly, and reduces the production cost.

Example 3

In this embodiment, the area of the blocking sheet 2 is larger than that of the opening 4, and the blocking sheet 2 completely covers the opening 4 and is recessed inward at the opening 4 to form a recess, and has an edge that is larger than the opening 4 and parallel to the opening 4. To cover the outside of the opening 4 on the packing box. As shown in Figure 4, the blocking sheet 2 located inside the pull tab 1 has an inwardly recessed recess at the opening 4, and Figure 5 shows that the blocking sheet 2 located outside the pull sheet 1 has an inwardly recessed portion at the opening 4 of the concave. The recess of the plugging sheet 2 can reduce the volume of the plugging sheet 2 , thereby greatly reducing the amount of plastic required to form the plugging sheet 2 , which is more in line with the requirements of environmental protection and plastic reduction. Further, openings can also be formed on the blocking sheet 2 by punching or injection molding. As shown in FIG. The recess; FIG. 7 shows that the blocking sheet 2 located on the outside of the pull tab 1 has an inward recess at the opening 4 and a recess with an opening. The opening on the blocking sheet 2 can be used as a straw hole, and the straw can directly extend into the packing box from the opening on the blocking sheet 2; The blocking sheet 2 is pushed back, so that the recess of the blocking sheet 2 fits and closes the opening 4 . Closing the openings on the sheet 2 provides a more flexible way to open the openings, and at the same time can further reduce the amount of plastic used in the blocking sheet 2, and the size of the openings is not limited. If an opening is provided in the blocking sheet 2 , before the opening 4 is opened or after it is closed again, the opening part is closed by the fixed connection between the blocking sheet 2 and the pull tab 1 . The sealing structure may further include: an outer film 6 disposed on the outer side of the opening 4 and the inner side of the pull tab 1 .

The prepared plugging sheet 2 can be solid or hollow, as long as the shape of the plugging sheet 2 matches the opening 4 and its material strength is sufficient to close the opening 4 . The plugging sheet 2 is made of plastic, paper, paper-plastic composite material, or degradable biomaterial. During production, the pull sheet 1, the blocking sheet 2 and the inner membrane 5 can be made of different materials, and then combined by heat sealing or bonding; of course, the pull sheet 1, the blocking sheet 2 and the inner membrane 5 can also be used Prepared from the same material, at this time the pull tab 1 and the plugging sheet 2 can also be integrally prepared.

Example 4

This embodiment discloses a sealing structure of a packaging box. The difference from the previous three embodiments is that, as shown in FIGS. side of the contents.

The inner film 5 is arranged inside the opening 4 of the composite packaging material 3, and the inner film 5 is heated so that the inner film 5 is bonded to the innermost layer of the inner side of the composite packaging material 3 at a position other than the opening 4; The plugging sheet 2 is fixed at a position corresponding to the opening 4 inside the intima 5 , or the plugging sheet 2 is formed by injection molding at a position corresponding to the opening 4 inside the intima 5 .

It is also possible to first fix the blocking sheet 2 on the inner film 5, and then attach the inner film 5 to the inner side of the opening 4 of the composite packaging material 3, specifically, form the blocking sheet 2 by injection molding on one side of the inner film 5 or fix it in advance. The formed blocking sheet 2 is made, the inner film 5 is heated, and the other side of the inner film 5 is bonded and sealed to the inner side of the opening 4 of the composite packaging material 3 .

The plugging sheet 2 is made of plastic, paper, paper-plastic composite material, or degradable biomaterial. The blocking sheet 2 can be solid or hollow, as long as the shape of the blocking sheet 2 matches the opening 4, and its material strength is enough to close the opening 4. During production, the pull sheet 1, the blocking sheet 2 and the inner membrane 5 can be made of different materials, and then combined by heat sealing or bonding; of course, the pull sheet 1, the blocking sheet 2 and the inner membrane 5 can also be used Prepared from the same material, as in this embodiment, the blocking sheet 2 and the inner membrane 5 can be integrally prepared.

When opening, the inner membrane 5 is ruptured, and the pulling piece 1 , the ruptured part of the inner membrane 5 and the blocking sheet 2 leave the opening 4 as a whole. An opening may also be provided in the middle of the plugging sheet 2, and the size of the opening is not limited. If an opening is provided in the blocking sheet 2, before the opening 4 is opened, the opening part is closed by the fixed connection between the inner membrane 5 and the pull tab 1; after opening, the blocking sheet 2 still passes through the inner membrane 5 and the pull tab 1 is fixedly connected, and the blocking sheet 2 can be reinserted into the opening 4 after being pulled out from the opening 4, and the opening part is closed by the pulling piece 1 and the torn inner membrane 5.

As shown in Figures 8 to 12, the sealing structure can also include: an outer film 6, the outer film 6 is arranged on the outside of the opening 4, and the pull tab 1 is arranged on the outer side of the outer film 6; the outer film 6 can be PE (Polyethylene, polyethylene ), the outer membrane 6 can also be prepared by a composite material of OPP (Oriented Polypropylene, stretched polypropylene) and PE. Among them, OPP can also be replaced by polyester materials such as HDPE, PP, PET/PBT. In the production process, the outer film 6 can be bonded on the composite packaging material 3 first, and then holes are punched in the area covered by the outer film 6 to form the opening 4; or the composite packaging material 3 can also be punched first, The opening 4 is formed, and the outer membrane 6 is arranged outside the opening 4 . The area of the outer membrane 6 is larger than that of the opening 4 , so that the outer membrane 6 can completely cover the opening 4 .

Preferably, the pull tab 1 is only partially attached to the outer film 6. At this time, at least part of the pull tab 1 is not fixed on the composite packaging material 3, so that the area of the outer film 6 can be smaller than the area of the pull tab 1, or the outer film 6 The length is less than the length of the pull tab 1, so that the pull tab 1 is lifted. The inner membrane 5 and the blocking sheet 2, the inner membrane 5 and the pull tab 1, and the outer membrane 6 and the pull tab 1 are fixedly connected by means of heat sealing or glue, ultrasonic wave or inductance.

Further, the sealing structure may also include a connecting part, which is used to prevent the pull tab 1 from completely detaching from the packaging box after opening. Specifically, as shown in Figure 12, one end of the connecting part 8 is connected to the inner membrane 5 around the opening 4, and one end of the connecting part 8 can also be connected to the innermost layer of the composite packaging material 3 near the opening 4, and the other end of the connecting part 8 It is fixedly connected with the blocking sheet 2. After the pull tab 1 is opened, the blocking sheet 2 is still connected to the packaging box through the connecting part 8, further preventing the blocking sheet 2 from leaving the packaging box. For example, the connection part 8 may be a connection belt or a connection strip, and the connection part 8 may be integrally injection molded with the sealing sheet 2 using an injection moldable material.

As shown in Figures 8 to 12, the edge of the plugging sheet 2 is chamfered or provided with a bevel, so that the plugging sheet 2 is easier to insert into the opening 4 under the action of an external force, or it is not easy to insert the plugging sheet 2 into the opening 4. Detach from the opening 4 to ensure the firmness of closing the opening 4.

In a preferred embodiment, as shown in FIG. 11 , several horizontal arc-shaped protrusions or arc-shaped grooves 7 are provided on the slope. When the sealing sheet 2 is embedded in the opening 4, the edge of the opening 4 is just at the junction of two arc-shaped protrusions or in the arc-shaped groove 7, so that the sealing sheet 2 and the packaging box are relatively fixed, which can effectively prevent blocking The thin sheet 2 is separated from the opening 4, and at the same time, the liquid in the packaging box can be prevented from flowing out.

The composite packaging material 3 is composed of a multi-layer structure such as a paper base layer, a barrier layer (such as aluminum foil), a waterproof layer, an innermost layer, and an adhesive layer. The thickness of the plugging sheet 2 is 1/8-8 times of the thickness of the base layer of the composite packaging material 3 . Preferably, the thickness of the sealing sheet 2 is 2-4 times the thickness of the base layer of the composite packaging material 3 . In one or some embodiments, as shown in FIG. 12 , the thickness of one side of the blocking sheet 2 is smaller than the thickness of the other side; When no connecting parts are provided on the top, the pull-tab 1 is pulled up from the thicker side of the blocking sheet 2 . More preferably, when the connecting part 8 is arranged on the thicker side of the blocking sheet 2, pull the tab 1 from the smaller side of the blocking sheet 2.

Example 5

An embodiment of the present application discloses a production process of a packaging box sealing structure, as shown in Figure 13, the production process includes the following steps:

Step S1: Perforating the composite packaging material to form an opening.

Step S2: An inner film and a pull-tab are respectively arranged on the inner side and the outer side of the opening, and the areas of the inner film and the pull-tab are larger than the area of the opening.

Step S3: setting a blocking sheet on the pull-tab or the inner membrane, the blocking sheet matches the shape of the opening and corresponds to the position of the opening.

In one embodiment, as shown in Figure 14, the production process of the packaging box sealing structure further includes:

An adventitia is provided on the outside of the opening.

In another embodiment, as shown in Figure 15, the production process of the sealing structure of the packaging box further includes:

The pull-tab is arranged above the outer film, and the pull-tab part is bonded to the outer film. At this time, at least part of the pull-tab is not fixed on the composite packaging material. For example, the area of the outer film can be made smaller than the area of the pull-tab, or the outer film The length is less than the length of the pull tab, and the unbonded part of the pull tab is convenient for lifting the pull tab when opening. The pull sheet is generally made of composite materials, such as the composite of paper and PE or the composite of aluminum foil and PE. The paper can be barrier paper, such as nanocellulose paper. Among them, paper or aluminum foil can also be used LDPE (low-density polyethylene, low-density polyethylene), HDPE (High Density Polyethylene, high-density polyethylene), PP (polypropylene, polypropylene), PA (polyamide, polyamide), PLA ( Polylactic Acid, polylactic acid) or PBAT (butyleneadipate-co-terephthalate, polyadipate/butylene terephthalate) and other materials instead.

In one embodiment, the blocking sheet is fixed on the inner side of the pull tab, and the inner film is fixedly connected with the blocking sheet at the opening position of the composite packaging material to close the opening. One of the specific methods is as follows: the punching equipment punches holes on the composite packaging material to form an opening; the inner film is bonded to the inner side of the opening; The thin sheet is a plastic material, such as plastic, which can be molded into a plugging thin sheet by injection molding equipment on the inner side of the pull sheet through an injection molding process. Alternatively, the blocking sheet can also be shaped first, and then the blocking sheet can be fixed on the inner side of the pull tab. The side of the blocking sheet that is not fixed to the pull tab is correspondingly arranged at the opening position, so that the blocking sheet and the inner membrane at the opening are fixedly connected together by a heat-sealing process or an adhesive process to close the opening.

Further, the sealing structure may also include a connecting part, which is used to prevent the pull tab from completely detaching from the packaging box after opening. Specifically, the connecting part can be formed by integral injection molding of an injection moldable material and the blocking sheet, such as injection molding equipment simultaneously injection-molding the blocking sheet with the connecting part on one side of the pull tab, or injection molding to form the blocking sheet with the connecting part first. Then fix the sealing sheet on the pull tab; then heat seal or glue the sealing sheet to the inner film, and heat seal or glue the other end of the connecting part to the composite packaging material.

It is also possible to set the end of the pull-tab as a connecting part, to glue or fix one end of the pull-tab on the composite packaging material, when the other end of the pull-tab that has never been bonded or fixed on the composite packaging material is lifted , still remain connected with the packing box, prevent the pull tab from completely detaching from the packing box, and make the opened blocking sheet easy to store and install back on the opening.

The connecting part can also be a part of the composite packaging material, that is, when the composite packaging material is punched to form an opening, the composite packaging material at the punched position is not completely cut off; the plugging sheet is fixedly connected on one side of the pull tab and will be cut open. The composite packaging material is also connected to the pull tab; the sealing sheet and the inner film are bonded to close the opening, and the pull tab can still be connected with the packaging box through the cut composite packaging material after opening.

In another embodiment, the blocking sheet is fixed on the outer surface of the pull tab, and the inner film is fixedly connected with the pull tab at the opening position of the composite packaging material to close the opening.

One of the specific ways is as follows: the outer film is set at the pre-punched position of the composite packaging material, and the punching equipment punches holes in the coverage of the outer film to form an opening, or the outer film is arranged on the opening formed by the composite packaging material; Adhesive on the inner side of the opening; set a blocking sheet on the pull tab, the plug sheet matches the shape of the opening, if the plug sheet is made of plastic material, such as plastic, it can be injection molded on the outside of the pull sheet by injection molding equipment through the injection molding process For blocking sheets. Alternatively, the blocking sheet can also be made into shape first, and then the blocking sheet can be fixed on the outside of the pull-tab; the side of the pull-tab without the blocking sheet and the inner membrane at the opening can be fixedly connected by a heat-sealing process or an adhesive process The openings are closed together, and the sealing sheets correspond to the positions of the openings after sealing.

Further, the sealing structure may also include a connecting part, which is used to prevent the pull tab from completely detaching from the packaging box after opening. Specifically, the connecting part can be formed by integral injection molding of an injection moldable material and the blocking sheet, such as injection molding equipment simultaneously injection-molding the blocking sheet with the connecting part on one side of the pull tab, or injection molding to form the blocking sheet with the connecting part first. Then fix the blocking sheet on the pull tab; when the pull tab and the inner film are fixedly connected by heat sealing or gluing, the other end of the connecting part can be heat sealed or glued to the composite packaging material at the same time.

It is also possible to set the end of the pull-tab as a connecting part, to glue or fix one end of the pull-tab on the composite packaging material, when the other end of the pull-tab that has never been bonded or fixed on the composite packaging material is lifted , still remain connected with the packing box, prevent the pull tab from completely detaching from the packing box, and make the opened blocking sheet easier to store and install back on the opening.

The connecting part can also be a part of the composite packaging material, that is, when the composite packaging material is punched to form an opening, the composite packaging material at the punched position is not completely cut off; the plugging sheet is fixedly connected on one side of the pull tab and will be cut open. The composite packaging material forming the opening is connected to the blocking sheet or to the pull-tab; the pull-tab is bonded to the inner film to close the opening, and the pull-tab can still be connected to the packaging box through the composite packaging material forming the opening after opening.

In yet another embodiment, the blocking sheet is fixed on the inner side of the inner film, and is fixedly connected with the inner film. At the opening position of the composite packaging material, the inner film is bonded to the pull tab to close the opening.

One of the specific methods is as follows: setting the outer film at the preset position of the composite packaging material, and the punching equipment punches holes in the coverage of the outer film to form an opening, or sets the outer film on the opening formed by the composite packaging material; connected to the inner side of the opening, and then set the blocking sheet on the inner side of the intima; or, first set the blocking sheet on one side of the intima, and then set the inner membrane with the blocking sheet on the inner side of the opening . The plugging sheet matches the shape of the opening, and the position corresponds to the opening. The pull tab and the inner film at the opening are fixedly connected together by a heat-sealing process or an adhesive process to close the opening.

Further, the sealing structure may also include a connecting part, which is used to prevent the pull tab from completely detaching from the packaging box after opening. Specifically, the connecting part can be formed by integral injection molding of the injection moldable material and the blocking sheet, such as injection molding of the blocking sheet with the connecting part on the intima at the same time by injection molding equipment, or, the blocking sheet with the connecting part is formed by injection molding first, Then fix the blocking sheet on the inner film; when the inner film is fixed at the opening position by heat sealing or gluing, the other end of the connecting part is fixed on the innermost layer of the composite packaging material near the opening or on the inner film.

In one embodiment, the edges of the plugging sheets are chamfered or beveled.

Further, several horizontal arc-shaped protrusions or arc-shaped grooves are formed on the inclined surface.

Composite packaging materials include base layer, barrier layer, waterproof layer, innermost layer and adhesive layer. The base layer of composite packaging materials generally adopts base paper, such as white bottom paper or kraft bottom paper.

In one embodiment, the thickness of the sealing sheet is made to be 1/8-8 times the thickness of the base layer of the composite packaging material.

In a preferred embodiment, the thickness of the sealing sheet is made to be 2-4 times the thickness of the base layer of the composite packaging material.

In one embodiment, when the sealing sheet is made, the thickness of one side of the sealing sheet is made smaller than the thickness of the other side, and it is preferable to pull the tab from the side of the smaller thickness of the sealing sheet.

Example 6

This embodiment discloses a sealing structure of a packaging box. The difference from Embodiment 1 is that the sealing structure of this embodiment includes an inner film 5 and a sealing sheet 2, but does not include a pull tab. The packaging box is made of a composite packaging material 3. The composite packaging material 3 includes a base layer, a barrier layer, a waterproof layer and an innermost layer. The sealing structure includes an inner film 5 and a sealing sheet 2; the sealing sheet 2 matches the shape of the opening 4, And it corresponds to the position of the opening 4; the inner membrane 5 covers the inner side of the opening 4, and the area of the inner membrane 5 is larger than the area of the opening 4; Opening of the opening 4; the sealing sheet 2 can be embedded in the opening 4 under the action of external force, so as to realize the sealing of the opening 4.

The sealing structure may also include an outer membrane 6 , and the outer membrane 6 is arranged on the outside of the opening 4 . The blocking sheet 2 is connected with the composite packaging material 3 through the outer film 6, the area of the blocking sheet 2 can be slightly larger than the outer film 6, and the external force can act on the part of the blocking sheet 2 beyond the outer film 6 to open the opening 4.

As shown in Figure 16, the area of the blocking sheet 2 is larger than that of the opening 4, the blocking sheet 2 completely covers the opening 4 and is recessed inward at the opening 4 to form a recess, and has an edge larger than the opening 4 and parallel to the opening 4, the edge Used to cover the outside of the opening 4 on the packaging box. In addition, as shown in FIG. 17 , openings can also be formed in the concave portion of the plugging sheet 2 by punching or injection molding, and the size of the openings is not limited. The perforation of the recess of the blocking sheet 2 can be used as a straw hole, and the straw can directly extend into the packing box from the opening on the blocking sheet 2; Push back the blocking sheet 2 so that the recess of the blocking sheet 2 fits and closes the opening 4 . If openings are provided in the plugging sheet 2, before the opening 4 is opened, the opening 4 is closed by the inner membrane 5, but after opening, the inner membrane 5 ruptures, and the opening 4 cannot be closed again. Closing the openings on the sheet 2 provides a more flexible way to open the openings, and at the same time can further reduce the amount of plastic used in the blocking sheet 2 .

Example 7

An embodiment of the present application discloses a production process of a packaging box sealing structure, including the following steps:

The composite packaging material is perforated to form openings.

An inner membrane is provided inside the opening, and the area of the inner membrane is larger than that of the opening.

A blocking sheet is provided on the outer side of the intima, and the blocking sheet matches the shape of the opening and corresponds to the position of the opening.

The inner membrane and the sealing sheet are fixedly connected by a heat-sealing process or an adhesive process, so that the sealing sheet can rupture the inner membrane at the opening under the action of an external force to realize the opening of the opening; the sealing sheet is pressed In the case of , the sealing sheet can be inserted into the opening to realize the sealing of the opening.

Those skilled in the art can understand that, similar to Embodiment 5, the sequence and adjacent relationship of the above steps are not limiting. For example, an outer film can be provided on the outside of the opening before punching to form the opening, that is, an outer film is first provided on the outer side of the composite packaging material, and then holes are punched in the area covered by the outer film to form the opening. It is also possible to provide an outer membrane on the outer side of the opening after forming the opening by punching a hole and before providing an inner membrane on the inner side of the opening. It is also possible to provide an adventitia on the outside of the opening after the intima is provided on the inside of the opening. In addition, it is also possible to set the blocking sheet on the inner membrane first, and then place the combination of the inner membrane and the blocking sheet at the opening.

The bonding mode between adjacent parts is similar to Example 5. If an adventitia is provided, the blocking sheet is arranged outside the adventitia, and part of the blocking sheet is bonded to the adventitia. Preferably, the area of the blocking sheet is larger than the opening, the blocking sheet completely covers the opening and is recessed inward at the opening to form a recess, and has an edge larger than the opening and parallel to the opening, and the edge is used to cover the outside of the opening on the packaging box , the edge is bonded to the outermost layer or outer film of the composite packaging material.

An embodiment of the present application discloses a packaging box, which is provided with the sealing structure in any of the above-mentioned embodiments, and the packaging box can realize repeated opening and closing of the packaging box opening, which is easy to carry and more environmentally friendly.

The above descriptions are only specific implementations of the present invention. Under the above teaching of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the object of the present invention, and the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

A sealing structure of a packaging box, the packaging box is made of a composite packaging material, the composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer, it is characterized in that the sealing structure includes: a pull tab, Intima and occlusive flaps;

The pull-tab covers the outside of the opening on the packaging box, the area of the pull-tab is larger than that of the opening, and the blocking sheet matches the shape of the opening and corresponds to the position of the opening; The inner membrane covers the inner side of the opening, and the area of the inner membrane is larger than the area of the opening;

Under the action of an external force, the pull tab can cause the inner membrane to rupture at the opening to realize the opening of the opening;

The blocking sheet can be inserted into the opening under the action of external force to realize the sealing of the opening.
The sealing structure according to claim 1, wherein the sealing sheet is located on the inner surface of the pull tab, and the inner membrane is fixedly connected to the sealing sheet.
The sealing structure according to claim 1, wherein the sealing sheet is located on the outer surface of the pull-tab, and the inner film is fixedly connected to the pull-tab.
The sealing structure according to claim 1, wherein the sealing sheet is located on the inner surface of the inner membrane, and the pulling tab is fixedly connected to the inner membrane.
The sealing structure according to claim 1, characterized in that, the sealing structure further comprises an outer film, the outer film is arranged on the outside of the opening, and the pull tab is arranged on the outer side of the outer film.
The sealing structure according to claim 5, characterized in that, the area of the outer film is smaller than the area of the pull tab or the length of the outer film is smaller than the length of the pull tab, and the pull tab part is in contact with the pull tab. Adventitia fixed connection.
The sealing structure according to claim 1, wherein the sealing sheet is made of plastic, paper, paper-plastic composite material, or biodegradable biomaterial.
The sealing structure according to claim 1, wherein the pull-tab is a composite material comprising a barrier material and a meltable material, the barrier material is at least one of aluminum foil or barrier paper, and the meltable material It is at least one selected from plastic, PLA or PBAT.
The sealing structure according to claim 1, characterized in that, the inner film is a PE film or a composite film.
The sealing structure according to claim 1, characterized in that, the edge of the sealing sheet is chamfered or provided with a slope.
The sealing structure according to claim 10, characterized in that, several horizontal arc-shaped protrusions or arc-shaped grooves are arranged on the slope.
The sealing structure according to claim 1, characterized in that, the thickness of the sealing sheet is 1/8-8 times of the thickness of the base layer of the composite packaging material.
The sealing structure according to claim 12, characterized in that, the thickness of the sealing sheet is 2-4 times the thickness of the base layer of the composite packaging material.
The sealing structure according to any one of claims 1-13, characterized in that, the thickness of one side of the blocking sheet is smaller than the thickness of the other side, and the plugging sheet is pulled up from the side with a smaller thickness. the pull tab.
The sealing structure according to any one of claims 1-13, characterized in that, the sealing structure further comprises a connecting part, and the connecting part connects the composite packaging material with the pull-tab or the sealing sheet .
The sealing structure according to any one of claims 1-13, characterized in that, the sealing structure further comprises a connecting part, the connecting part is the end of the pull tab, and the end of the pull tab is connected to the The composite packaging materials are connected.
The sealing structure according to claim 4, characterized in that, the sealing structure further comprises a connecting part, one end of the connecting part is fixedly connected to the inner membrane near the inner side of the opening or the innermost layer, and the other end is It is fixedly connected with the blocking sheet.
The sealing structure according to any one of claims 1-13, characterized in that, the sealing sheet is a hollow structure and/or the middle part of the sealing sheet has an opening.
The sealing structure according to claim 2 or 3, characterized in that, the sealing sheet is recessed toward the opening side to form a recess.
The sealing structure according to claim 19, wherein the concave portion has an opening.
A kind of production technology of packaging box sealing structure, it is characterized in that, described production technology comprises the steps:

Step S1: punching the composite packaging material to form an opening;

Step S2: setting an inner film and a pull tab on the inside and outside of the opening respectively, the areas of the inner film and the pull tab are larger than the area of the opening;

Step S3: setting a blocking sheet on the pull-tab or the inner membrane, the blocking sheet matches the shape of the opening and corresponds to the position of the opening;

Step S4: The inner membrane, the blocking sheet and the pull-tab are fixedly connected by heat-sealing process or gluing process, so that the pull-tab can make the inner membrane under the action of external force. The opening is broken to realize the opening of the opening; when the blocking sheet is pressed, the blocking sheet can be embedded in the opening to realize the sealing of the opening.
The production process according to claim 21, wherein the production process further comprises:

providing an adventitia outside the opening; or,

An outer film is arranged on the outer side of the composite packaging material, and holes are punched in the area covered by the outer film to form the opening.
A sealing structure of a packaging box, the packaging box is made of a composite packaging material, the composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer, it is characterized in that the sealing structure includes: an inner film and A blocking sheet, the inner membrane is fixedly connected to the blocking sheet;

The blocking sheet matches the shape of the opening and corresponds to the position of the opening; the inner membrane covers the inner side of the opening, and the area of the inner membrane is larger than that of the opening;

Under the action of external force, the blocking sheet can cause the inner membrane to rupture at the opening, so as to realize the opening of the opening;

The blocking sheet can be inserted into the opening under the action of external force to realize the sealing of the opening.
The sealing structure according to claim 23, wherein the sealing sheet is recessed toward the opening side to form a recess, and has an edge larger than the opening and parallel to the opening, and the edge is used to cover The outer side of the opening on the packaging box.
A sealing structure of a packaging box, the packaging box is made of a composite packaging material, the composite packaging material includes a base layer, a barrier layer, a waterproof layer and an innermost layer, it is characterized in that the sealing structure includes: an inner film and A blocking sheet, the inner membrane is fixedly connected to the blocking sheet;

The blocking sheet matches the shape of the opening and corresponds to the position of the opening; the inner membrane covers the inner side of the opening, and the area of the inner membrane is larger than that of the opening;

Under the action of external force, the blocking sheet can cause the inner membrane to rupture at the opening, so as to realize the opening of the opening;

The blocking sheet can be inserted into the opening under the action of external force to realize the sealing of the opening;

The blocking sheet is recessed toward the opening side to form a recess, and has an edge that is larger than the opening and parallel to the opening, and the edge is used to cover the outer side of the opening on the packaging box, and the recess has an opening. hole.
A packing box, characterized in that the packing box is provided with the sealing structure according to any one of claims 1-20, 23-25.