Glue injection sealing structure in can cover

Abstract

The utility model relates to the technical field of fire retardant coating preparation, and particularly discloses a tin cover inner glue injection sealing structure which comprises a cover body, a fixing ring is fixedly connected to the edge of the top of the inner side of the cover body, a glue injection groove is formed in the lower end face of the fixing ring, and a limiting ring with the diameter smaller than that of the fixing ring is fixedly connected to the top of the inner side of the cover body. By means of the integrated glue injection sealing structure, the problems that a traditional gasket is prone to aging, dislocation and leakage are thoroughly solved, precise forming of glue is ensured through the double-ring positioning design, mechanical locking of the trapezoidal groove and weather resistance of a silica gel material are combined, and the sealing performance of the gasket is improved. Long-acting airtight protection is achieved, the arc-shaped sealing face compensates for tank opening deformation in a self-adaptive mode, the tolerance to temperature fluctuation and pressure changes is remarkably improved, the gasket assembly process is simplified through the overall process, the pollution risk is completely eradicated, the maintenance cost is greatly reduced, and the sealing device is suitable for high-sealing-requirement scenes such as food and medicine.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, and specifically discloses an adhesive injection sealing structure for iron can lids. Background Technology

[0002] Food packaging is an integral part of food products and one of the major engineering processes in the food industry. It protects food from biological, chemical, and physical damage during its journey from the factory to the consumer. It also helps maintain the stable quality of the food itself, facilitates consumption, and is the primary element representing the food's appearance, attracting consumers and possessing value beyond material cost. Therefore, food packaging is an inseparable part of the food manufacturing systems engineering. However, the versatility of food packaging also gives it a relatively independent self-system.

[0003] Most existing food packaging tin cans use rubber or silicone gaskets embedded inside the lid for sealing. This structure relies on the elastic deformation of the gasket to press against the can opening. However, temperature changes can easily cause the gasket to age or deform, and pressure fluctuations can cause the screw tension to loosen. Mechanical misalignment can lead to uneven contact between the gasket and the can opening. This type of sealing method has a short lifespan, low reliability, and requires frequent gasket replacement, increasing costs. Utility Model Content

[0004] This utility model proposes an internal glue injection sealing structure for iron can lids, which completely solves the problems of easy aging, misalignment and leakage of traditional gaskets through an integrated glue injection sealing structure.

[0005] This utility model is implemented as follows: a sealing structure for an inner can lid, comprising a lid body, a fixing ring fixedly connected to the inner top edge of the lid body, an injection groove formed on the lower end face of the fixing ring, and a limiting ring with a diameter smaller than the fixing ring fixedly connected to the inner top of the lid body. The injection groove and the area between the fixing ring and the limiting ring are filled with a cured sealant layer, and the lower end face of the cured sealant layer forms an outwardly protruding sealing contact surface.

[0006] As a preferred embodiment of the glue-filling sealing structure inside the iron can lid of this utility model, the cross-section of the glue-filling groove is trapezoidal.

[0007] As a preferred embodiment of the adhesive-filled sealing structure for the inner lid of an iron can according to this utility model, the cured sealant layer is made of food-grade silicone.

[0008] In a preferred embodiment of the glue-filling sealing structure for an iron can lid according to this utility model, the thickness of the limiting ring is greater than the thickness of the fixing ring.

[0009] As a preferred embodiment of the glue-filled sealing structure for the inner lid of the iron can according to this utility model, the cross-section of the sealing contact surface is an arc-shaped structure.

[0010] As a preferred embodiment of the glue-filled sealing structure for an iron can lid according to this utility model, the inner side wall of the lid is provided with threads.

[0011] The beneficial effects of this utility model are:

[0012] This invention completely solves the problems of easy aging, misalignment and leakage of traditional gaskets through an integrated glue injection sealing structure. The double-ring positioning design ensures precise molding of the glue, and the combination of trapezoidal groove mechanical locking and the weather resistance of silicone material achieves long-term airtight protection. The arc-shaped sealing surface adaptively compensates for the deformation of the tank opening, significantly improving the tolerance to temperature fluctuations and pressure changes. The overall process simplifies the gasket assembly process, eliminates the risk of contamination, and greatly reduces maintenance costs. It is suitable for high sealing requirements in food, pharmaceutical and other scenarios. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a front sectional view of the overall structure of this utility model;

[0015] Figure 2 This is a bottom view of the structure of the cover body of this utility model in the unfilled state of the cured sealant layer;

[0016] Figure 3 This is a top view of the structure of the cover body of this utility model in the state of curing and sealing adhesive layer filling.

[0017] The markings in the diagram are: 1. Cover; 2. Retaining ring; 3. Adhesive injection groove; 4. Limiting ring; 5. Cured sealant layer; 6. Sealing contact surface. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0019] Please see Figure 1-3A sealing structure for an inner can lid includes a lid body 1. A fixing ring 2 is fixedly connected to the inner top edge of the lid body 1. An injection groove 3 is formed on the lower end face of the fixing ring 2. A limiting ring 4 with a diameter smaller than the fixing ring 2 is fixedly connected to the inner top of the lid body 1. The injection groove 3 and the area between the fixing ring 2 and the limiting ring 4 are filled with a cured sealant layer 5. The lower end face of the cured sealant layer 5 forms an outwardly protruding sealing contact surface 6.

[0020] In this embodiment: A glue injection groove 3 is opened on the top inner side of the cover 1 through a fixing ring 2. The diameter of the limiting ring 4 is smaller than that of the fixing ring 2 and is fixed coaxially with it. Liquid food-grade silicone is injected into the glue injection groove 3 and the area between the two rings. After curing, an integral cured sealing layer 5 is formed. The lower end face of the layer is molded into an outwardly protruding arc-shaped sealing contact surface 6. The fixing ring 2 and the limiting ring 4 restrict the flow range of the glue, ensuring that the sealing contact surface 6 is accurately formed. The glue injection groove 3 increases the bonding area between the glue and the metal. After curing, a mechanical interlock is formed to prevent delamination. When the cap is screwed on, the sealing contact surface 6 adapts to the deformation of the can opening and eliminates leakage caused by mechanical misalignment.

[0021] As a technical optimization of this utility model, the cross-section of the glue injection groove 3 is trapezoidal.

[0022] In this embodiment, the cross-section of the injection groove 3 is trapezoidal. The injection groove 3 increases the bonding area between the adhesive and the metal, and after curing, it forms a mechanical interlock to prevent delamination.

[0023] As a technical optimization of this utility model, the cured sealant layer 5 is made of food-grade silicone.

[0024] In this embodiment: the cured sealant layer 5 is made of food-grade silicone, which is resistant to high temperature and aging, thus solving the problem of aging and contamination of traditional rubber gaskets.

[0025] As a technical optimization of this utility model, the thickness of the limiting ring 4 is greater than the thickness of the fixing ring 2.

[0026] In this embodiment, the thickness of the limiting ring 4 is greater than the thickness of the fixing ring 2, thereby forming an area filled with the cured sealant layer 5 through the limiting ring 4 and the fixing ring 2.

[0027] As a technical optimization of this utility model, the cross-section of the sealing contact surface 6 is an arc-shaped structure.

[0028] In this embodiment: the cross-section of the sealing contact surface 6 is an arc-shaped structure. The can opening is tightened and squeezed to compress the sealing contact surface 6, causing it to deform and become concave, thus forming an effective seal.

[0029] As a technical optimization of this utility model, the inner wall of the cover 1 is provided with threads.

[0030] In this embodiment: the inner wall of the cover 1 is provided with threads, which facilitates tightening by matching the external threads of the tank.

[0031] The working principle and usage process of this utility model are as follows: Liquid silicone is injected into the injection groove 3. After the liquid silicone overflows from the injection groove 3, it fills the annular cavity between the fixing ring 2 and the limiting ring 4. The thickness advantage of the limiting ring 4 forms a vertical baffle, which restricts the radial diffusion of the colloid and ensures that the cured sealant layer 5 is concentrated in the sealing area. Heating and curing cause the silicone to form a chemical bond with the side wall of the injection groove 3 and the surface between the fixing ring 2 and the limiting ring 4. The mold presses the lower end face of the cured sealant layer 5 to form a sealing contact surface 6 with a preset arc. When the cover 1 is tightened to the can body through the inner thread, the sealing contact surface 6 is deformed downward under pressure. The sealing contact surface 6 elastically fits the can opening plane. At the same time, the cured sealant layer 5 between the fixing ring 2 and the limiting ring 4 provides lateral support force, forming a three-dimensional sealing barrier.

[0032] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A glue-filled sealing structure for an iron can lid, comprising a lid body (1), characterized in that: A fixing ring (2) is fixedly connected to the inner top edge of the cover (1). A glue injection groove (3) is opened on the lower end face of the fixing ring (2). A limiting ring (4) with a diameter smaller than the fixing ring (2) is fixedly connected to the inner top of the cover (1). The glue injection groove (3) and the area between the fixing ring (2) and the limiting ring (4) are filled with a cured sealant layer (5). The lower end face of the cured sealant layer (5) forms an outwardly protruding sealing contact surface (6).

2. The glue-filled sealing structure for an iron can lid according to claim 1, characterized in that: The cross-section of the glue injection groove (3) is trapezoidal.

3. The glue-filled sealing structure for an iron can lid according to claim 1, characterized in that: The cured sealant layer (5) is made of food-grade silicone.

4. The glue-filled sealing structure for an iron can lid according to claim 1, characterized in that: The thickness of the limiting ring (4) is greater than the thickness of the fixing ring (2).

5. The glue-filled sealing structure for an iron can lid according to claim 1, characterized in that: The cross-section of the sealing contact surface (6) is an arc-shaped structure.

6. The glue-filled sealing structure for an iron can lid according to claim 1, characterized in that: The inner wall of the cover (1) is provided with threads.

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