Self-sealing bag

Abstract

The utility model provides a self-sealing bag, and relates to the technical field of packaging bags. The self-sealing bag comprises a bag body, a first self-sealing belt and a second self-sealing belt, the first self-sealing belt and the second self-sealing belt are arranged on an opening portion, the first self-sealing belt is provided with a first protruding portion with a T-shaped section, the second self-sealing belt is correspondingly provided with a complementary first embedding groove, and preferably, the second self-sealing belt is additionally provided with second protruding portions arranged in parallel, and the first self-sealing belt is correspondingly provided with a second embedding groove. The bag body and the self-sealing belt are integrally formed through the co-extrusion forming technology, a transition area with the gradient material density is formed between the protruding part and the base body, and the bag body and the self-sealing belt are preferably made of silica gel materials. Through the unique geometric embedded structure and the material characteristic design, the continuity and bonding strength of a sealing interface are effectively improved, good durability and opening and closing hand feeling are achieved, and the technical problems that a traditional self-sealing bag is prone to leakage and short in sealing service life are solved.

Description

Technical Field

[0001] This utility model relates to the field of packaging container technology, and in particular to self-sealing bags. Background Technology

[0002] Self-sealing bags, as convenient sealed packaging containers, are widely used in food preservation, daily necessities storage, and medical supplies packaging. Traditional self-sealing bags mostly use a single-sided convex strip and groove interlocking structure to achieve a seal, such as the common "zipper-style" sealing strip. However, this type of structure is prone to a decline in sealing performance due to material wear or deformation after repeated opening and closing, especially in liquid or fine particulate matter packaging scenarios, where leakage problems are likely to occur. In addition, some improvement solutions enhance the sealing effect by increasing the number of sealing strips or complex geometries, but these often result in high production costs and poor user experience (such as difficulty in closing and unclear tactile feedback) due to insufficient processing precision, low material interface bonding strength, or excessive interlocking resistance.

[0003] In recent years, co-extrusion molding has been introduced into the manufacture of self-sealing bags to optimize material properties and structural integrity. However, in existing technologies, stress concentration often occurs at the interface transition area between the self-sealing tape and the bag substrate due to abrupt changes in material density, leading to cracking or delamination after long-term use. Furthermore, traditional sealing structures lack an effective two-way interlocking mechanism, making it difficult to balance sealing strength and ease of opening and closing. They also lack positive tactile feedback design for user operation, resulting in incomplete sealing or the risk of misoperation. Therefore, there is an urgent need for a self-sealing bag structural design that combines high sealing performance, durability, ease of operation, and a good user experience. Utility Model Content

[0004] To address the problems existing in the above-mentioned technologies, this utility model proposes a self-sealing bag with a structure that features high sealing performance, durability, ease of operation, and a good user experience.

[0005] The present invention provides a self-sealing bag, comprising a bag body, wherein a first self-sealing strip and a second self-sealing strip are provided oppositely on the inner side wall of the opening of the bag body; the first self-sealing strip has a first protrusion with a T-shaped cross-section integrally formed along its length direction, and the second self-sealing strip has a first fitting groove along its length direction that is complementary to the shape of the first protrusion.

[0006] When the first self-sealing tape and the second self-sealing tape are squeezed by external force, the first protrusion is detachably fitted into the first fitting groove to form a continuous sealing interface.

[0007] Preferably, the second self-sealing tape has a second protrusion along its length, and the cross-section of the second protrusion is T-shaped and arranged parallel to the first fitting groove;

[0008] The first self-sealing tape has a second fitting groove at the position corresponding to the second protrusion, and the cross-sectional shape of the second fitting groove forms a complementary fitting structure with the second protrusion;

[0009] When the first self-sealing tape and the second self-sealing tape are fitted together, the first protrusion and the first fitting groove, and the second protrusion and the second fitting groove form a bidirectional interlocking sealing structure.

[0010] Preferably, the contact surfaces of the first protrusion and the second protrusion are provided with guide slopes, and the groove edges of the first fitting groove and the second fitting groove are provided with arc transition portions. The guide slopes and the arc transition portions form a progressive guide fit structure, and a tactile feedback signal is generated when the self-sealing tape is fitted.

[0011] Preferably, the bag body, the first self-sealing tape, and the second self-sealing tape are integrally formed into a continuous substrate layer through a co-extrusion molding process; a gradual material density transition zone is formed between the first protrusion, the second interlocking groove and the substrate of the first self-sealing tape, and between the first interlocking groove, the second protrusion and the substrate of the second self-sealing tape.

[0012] Preferably, the self-sealing bag is made of silicone material.

[0013] The technical advantages of the self-sealing bag provided by this utility model are:

[0014] 1. Through the bidirectional interlocking sealing structure (the cooperation of the first protrusion with the first fitting groove and the second protrusion with the second fitting groove), multiple sealing interfaces are formed. The fitting design of the T-shaped protrusion and the complementary groove significantly increases the sealing contact area, effectively blocking the penetration of liquids, gases and tiny particles. It is especially suitable for liquid encapsulation or vacuum storage scenarios, solving the technical defects of traditional single sealing strips that are prone to leakage.

[0015] 2. The design of the guide slope and the arc transition section reduces the fitting resistance and achieves gradual closure. The tactile feedback signal generated during the fitting process (such as a "click" feeling) clearly indicates to the user that the seal is complete, reducing the risk of misoperation, while maintaining the smoothness of the opening and closing action.

[0016] 3. The bidirectional interlocking structure is completed in one step through co-extrusion molding, without the need for complex post-processing steps. The process design of the gradient density transition zone takes into account both structural strength and material utilization, reducing the scrap rate caused by material interface defects, and is suitable for large-scale industrial production.

[0017] 4. The co-extrusion molding process forms an integrated continuous substrate layer between the bag body and the self-sealing tape. Combined with the design of a gradual material density transition zone between the protrusion and the substrate, it alleviates the problem of stress concentration at the material interface and avoids delamination or cracking caused by long-term opening and closing. The use of silicone material further improves flexibility and aging resistance, and extends the service life of the sealing structure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the self-sealing bag according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0021] Figure 3 yes Figure 1 Enlarged view of section B in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of the self-sealing bag according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the self-sealing bag from another perspective of an embodiment of this utility model.

[0024] Reference numerals: 1. Bag body; 2. Opening; 3. First self-sealing tape; 31. First protrusion; 32. Second fitting groove; 4. Second self-sealing tape; 41. First fitting groove; 42. Second protrusion; 5. Guide slope (311; 421); 6. Arc transition (320; 410) Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The main body of the self-sealing bag is made of food-grade silicone material, which has high temperature resistance (-50℃~250℃), flexibility and chemical stability. The self-sealing tape is integrally formed with the bag body through co-extrusion molding process to ensure the interface bonding strength.

[0027] Please see Figures 1 to 5 The self-sealing bag in this embodiment includes a bag body 1, and a first self-sealing tape 3 and a second self-sealing tape 4 are provided on the inner side wall of the opening 2 of the bag body 1 facing each other.

[0028] The first self-sealing tape 3 is integrally formed with a first protrusion 31 along its length. The first protrusion 31 has a T-shaped cross-section, and guide slopes 311 are provided on both sides of the first protrusion 31. The second self-sealing tape 4 has a first fitting groove 41 along its length that is complementary in shape to the first protrusion 31. The groove opening edge of the first fitting groove 41 has an arc transition portion 410. When the first self-sealing tape 3 and the second self-sealing tape 4 are compressed by external force, the first protrusion 31 is detachably fitted into the first fitting groove 41 to form a continuous sealing interface.

[0029] The second self-sealing tape 4 has a second protrusion 42 along its length. The cross-section of the second protrusion 42 is T-shaped and arranged parallel to the first fitting groove 41. Guide slopes 421 are provided on both sides of the contact surface of the second protrusion 42. The first self-sealing tape 3 has a second fitting groove 32 at the position corresponding to the second protrusion 42. The edge of the groove of the second fitting groove 32 has an arc transition portion 320. The cross-sectional shape of the second fitting groove 32 and the second protrusion 42 form a complementary fitting structure.

[0030] When the first self-sealing tape 3 and the second self-sealing tape 4 are engaged, the first protrusion 31 and the first engagement groove 41, and the second protrusion 42 and the second engagement groove 32 form a bidirectional interlocking sealing structure.

[0031] When closed, pressure is applied to the self-sealing strips on both sides. The guide slope 311 of the first protrusion 31 contacts the arc transition portion 410 of the first fitting groove 41, guiding the first protrusion 31 to slide into the first fitting groove 41. After the first protrusion 31 is fully embedded in the first fitting groove 41, the second protrusion 42 simultaneously embeds into the second fitting groove 32, forming a double-locking fit. At this time, the total contact length of the sealing interface increases to twice that of a single-sided seal, and the T-shaped structure generates a lateral expansion force within the groove, enhancing the sealing density.

[0032] During the fitting process, the interaction between the guide ramp and the arc transition section generates progressive resistance. When the protrusion is fully embedded in the bottom of the groove, the elastic deformation of the silicone material is released, producing a distinct "click" tactile feedback signal to indicate to the user that the sealing is complete. By adjusting the angle of the guide ramp and the gap between the top of the protrusion and the bottom of the groove, the clarity of the feel and the amount of force required for operation can be optimized.

[0033] It should be noted that the bag body 1, the first self-sealing tape 3, and the second self-sealing tape 4 are integrally formed into a continuous substrate layer through a co-extrusion molding process; a gradual material density transition zone is formed between the first protrusion 31, the second interlocking groove 32 and the substrate of the first self-sealing tape 3, and between the first interlocking groove 41, the second protrusion 42 and the substrate of the second self-sealing tape 4.

[0034] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are only used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-sealing bag, comprising a bag body (1), characterized in that: The inner wall of the opening (2) of the bag body (1) is provided with a first self-sealing tape (3) and a second self-sealing tape (4) facing each other; The first self-sealing tape (3) has an integrally formed first protrusion (31) with a T-shaped cross-section along its length direction, and the second self-sealing tape (4) has a first fitting groove (41) with a shape complementary to the first protrusion (31) along its length direction. When the first self-sealing tape (3) and the second self-sealing tape (4) are squeezed by external force, the first protrusion (31) is detachably fitted into the first fitting groove (41) to form a continuous sealing interface; The second self-sealing tape (4) is provided with a second protrusion (42) along its length direction. The cross-section of the second protrusion (42) is T-shaped and arranged parallel to the first fitting groove (41). The first self-sealing tape (3) has a second fitting groove (32) at the position corresponding to the second protrusion (42), and the cross-sectional shape of the second fitting groove (32) and the second protrusion (42) form a complementary fitting structure; When the first self-sealing tape (3) and the second self-sealing tape (4) are fitted together, the first protrusion (31) and the first fitting groove (41) and the second protrusion (42) and the second fitting groove (32) form a bidirectional interlocking sealing structure. The bag body (1), the first self-sealing tape (3), and the second self-sealing tape (4) are integrally formed into a continuous substrate layer through a co-extrusion molding process; a gradual material density transition zone is formed between the first protrusion (31), the second interlocking groove (32) and the substrate of the first self-sealing tape (3), and between the first interlocking groove (41), the second protrusion (42) and the substrate of the second self-sealing tape (4).

2. The self-sealing bag of claim 1, wherein: The first protrusion (31) and the second protrusion (42) are provided with guide slopes (311; 421) on their contact surfaces. The groove edges of the first fitting groove (41) and the second fitting groove (32) are provided with arc transition portions (410; 320). The guide slopes (311; 421) and the arc transition portions (410; 320) form a progressive guide fit structure, which generates a tactile feedback signal when the self-sealing tape is fitted.

3. The self-sealing bag of claim 2, wherein, The self-sealing bag is made of silicone material.

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