Bag opening welding structure

Abstract

The utility model discloses a bag mouth welding structure, which comprises two face-to-face membranes, and edges of the two membranes are connected to form a bag body with a bag mouth. The rib base material is arranged on the inner surface, corresponding to the membrane, of the bag opening and used for opening and closing the bag opening; the first fusion parts are arranged at the two ends of the bag opening, the first fusion parts are formed by hot-pressing the membrane on the bone strip base material, each first fusion part is provided with a plurality of convex parts and a plurality of concave parts, and the convex parts and the concave parts are crisscrossed to form a net shape. According to the bag opening welding structure, the ends of the two membranes and the ends of the two rib base materials are welded and fixed together through the first fusion part, and the first fusion part is provided with the multiple convex parts and the multiple concave parts which are formed in a welding mode and are crisscrossed to form the net shape. The first fusion parts can increase the fusion volume between the membranes, the fusion volume between the bone strip base materials and the fusion volume between the membranes and the bone strip base materials, and the structural strength of the bag opening is improved so that the phenomenon of pseudo soldering or easy tearing can be avoided.

Description

Technical Field

[0001] The utility model relates to a bag mouth welding structure. Background Art

[0002] A general sealing bag includes a bag body and a sealing strip assembly disposed at the bag mouth of the bag body. Among them, the bag body is formed by welding two overlapping film sheets. The two film sheets are welded at the bottom edge and the two side edges to define the shape of the bag mouth. The sealing strip assembly includes a first bone strip and a second bone strip that engages with the first bone strip. The first bone strip and the second bone strip are respectively disposed on the inner surfaces of the two film sheets near the bag mouth, and the first bone strip and the second bone strip need to be arranged parallel to each other face to face.

[0003] Among them, both ends of the first bone strip and the second bone strip respectively extend to the vicinity of the two side edges of the film sheet where they are located. When directly welding the side edges of the two film sheets together, the sealing is achieved by the welding structure of the surfaces in contact between the two film sheets. It is easy to have the phenomenon of false welding, and it is easy to cause tearing and air leakage when repeatedly opening and closing the bag mouth, resulting in the loss of the sealing effect. In addition, it is difficult for the first bone strip and the second bone strip to be stably combined with the corresponding film sheet, and it is also easy to cause detachment, ultimately affecting the service life and use effect of the sealing bag. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a bag mouth welding structure with stable structure, good sealing performance and not easy to tear after welding.

[0005] A bag mouth welding structure according to an embodiment of the utility model includes: two facing film sheets, the edges of the two film sheets are connected to form a bag body with a bag mouth; a bone strip substrate disposed on the inner surface of the corresponding film sheet at the bag mouth for opening and closing the bag mouth; a first fusion part disposed at both ends of the bag mouth, and the first fusion part is formed by hot pressing the film sheet on the bone strip substrate. The first fusion part has a plurality of convex parts and a plurality of concave parts, and the plurality of convex parts and the plurality of concave parts are crisscrossed into a net shape.

[0006] The bag mouth welding structure according to the embodiment of the utility model has at least the following beneficial effects:

[0007] The above bag mouth welding structure sets the first fusion part at both ends of the bag mouth, and uses the first fusion part to weld and fix the ends of the two film sheets and the two bone strip substrates together. The first fusion part has a plurality of convex parts and concave parts that are crisscrossed into a net shape formed by fusion welding. Compared with the traditional welding method of surface-to-surface contact, the first fusion part can increase the volume of fusion between the film sheets, between the bone strip substrates, and between the film sheet and the bone strip substrate, improve the structural strength of the bag mouth to avoid the phenomenon of false welding or easy tearing.

[0008] In some embodiments of the present utility model, the first fusion part is connected to a second fusion part formed on the side edge of the bag body. The second fusion part has a plurality of convex parts and a plurality of concave parts, and the plurality of convex parts and the plurality of concave parts are crisscrossed to form a network.

[0009] In some embodiments of the present utility model, one outer surface of the first fusion part is a plane.

[0010] In some embodiments of the present utility model, both outer surfaces of the first fusion part have the convex parts and the concave parts.

[0011] In some embodiments of the present utility model, the maximum thickness dimension of the first fusion part is a, and the minimum thickness dimension of the first fusion part is b, satisfying: 0.4a ≤ b ≤ 0.9a.

[0012] In some embodiments of the present utility model, the convex part is rectangular, and the side length of the convex part is 0.2 mm to 3 mm.

[0013] In some embodiments of the present utility model, the height dimension of the convex part is 0.1 mm to 0.5 mm.

[0014] In some embodiments of the present utility model, in the direction from the end of the bone strip substrate towards the middle of the bone strip substrate, the depth dimension of the concave part on the first fusion part gradually becomes shallower.

[0015] In some embodiments of the present utility model, the first fusion part has a protection area protruding towards the middle direction of the bone strip substrate, and at least part of the contour edge of the protection area has a smooth transition.

[0016] In some embodiments of the present utility model, the first fusion part is connected to a transition area extending towards the side edge of the bag body. There is a lowest fusion point c between the transition area and the side edge of the bag body, and the transition area gradually becomes wider from the lowest fusion point c towards the direction of the first fusion part.

[0017] In some embodiments of the present utility model, the thickness dimension of the transition area gradually becomes thicker from the lowest fusion point c towards the first fusion part.

[0018] In some embodiments of the present utility model, the bone strip substrate is composed of a sealed bone strip and a bone strip film. The two bone strip substrates are respectively a male snap bone strip and a female snap bone strip, and there is a height difference between the bone strip films on the male snap bone strip and the female snap bone strip.

[0019] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Brief Description of the Drawings

[0020] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0021] Figure 1 is a schematic structural diagram of the first embodiment of the bag mouth welding structure of the present utility model;

[0022] Figure 2 is a schematic cross-sectional view in which both outer surfaces of the first fusion part have concave parts and convex parts;

[0023] Figure 3 is a schematic cross-sectional view in which one outer surface of the first fusion part is a plane;

[0024] Figure 4 is Figure 1 a schematic view from the side perspective at the bag mouth of the embodiment;

[0025] Figure 5 is Figure 1 a schematic A-A cross-sectional view of the embodiment;

[0026] Figure 6 is a schematic structural diagram of the second embodiment of the bag mouth welding structure of the present utility model;

[0027] Figure 7 is Figure 6 a schematic B-B cross-sectional view of the embodiment.

[0028] Reference Signs:

[0029] Diaphragm 100; Rib Substrate 200; Sealing Rib 210; Rib Film 220; First Fusion Part 300; Convex Part 400; Concave Part 500; Second Fusion Part 600; Protection Area 700; Transition Area 800. Detailed Description of the Specific Embodiments

[0030] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, it should be understood that regarding the orientation description, for example, terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, while understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] See Figures 1 to 3 , a bag mouth welding structure of the present utility model includes: two facing diaphragm pieces 100, the edges of the two diaphragm pieces 100 are connected to form a bag body with a bag mouth; a bone strip substrate 200, provided on the inner surface of the diaphragm piece 100 corresponding to the bag mouth for opening and closing the bag mouth; a first fusion part 300, provided at both ends of the bag mouth, and the first fusion part 300 is formed by thermally pressing the diaphragm piece 100 on the bone strip substrate 200. The first fusion part 300 has a plurality of convex parts 400 and a plurality of concave parts 500, and the plurality of convex parts 400 and the plurality of concave parts 500 are crisscrossed to form a net shape.

[0035] The above bag mouth welding structure is provided with a first fusion part 300 at both ends of the bag mouth. The first fusion part 300 is used to weld and fix the ends of two diaphragms 100 and two bone strip substrates 200 together. The first fusion part 300 has a plurality of convex parts 400 and concave parts 500 formed by fusion and crisscrossed into a net shape. Compared with the traditional welding method of surface-to-surface contact, the first fusion part 300 can increase the volume of fusion between the diaphragms 100, between the bone strip substrates 200, and between the diaphragm 100 and the bone strip substrate 200, improving the structural strength of the bag mouth to avoid the phenomenon of false welding or easy tearing. Specifically, first, the two bone strip substrates 200 are respectively pre-welded or pasted on the inner surfaces of the two diaphragms 100. The mold for making the above bag mouth welding structure includes a first half mold and a second half mold. The first half mold and / or the second half mold is provided with a concave cavity matching the convex part 400 of the first fusion part 300, and the first half mold and / or the second half mold is provided with a convex cavity matching the concave part 500 of the first fusion part 300. Then, when the first half mold and the second half mold respectively contact the outer surfaces of the two diaphragms 100 and approach each other, the ends of the two diaphragms 100 and the two bone strip substrates 200 can be welded and fused together.

[0036] It should be noted that a plurality of convex parts 400 and a plurality of concave parts 500 are arranged alternately along the first direction, and a plurality of convex parts 400 and a plurality of concave parts 500 are also arranged alternately along the second direction. When the first direction and the second direction are orthogonal to each other, the above-mentioned crisscrossed net-shaped layout can be formed.

[0037] See Figure 1 Or see Figure 6 , in some embodiments of the present invention, the first fusion part 300 is connected to a second fusion part 600 formed on the side edge of the bag body. The second fusion part 600 has a plurality of convex parts 400 and a plurality of concave parts 500, and the plurality of convex parts 400 and the plurality of concave parts 500 are crisscrossed into a net shape. The setting of the second fusion part 600 strengthens the welding strength at the joint of the two diaphragms 100 at the side edge, making the structure at the position where the two diaphragms 100 are in direct contact stable, with good sealing performance and not easy to tear.

[0038] See Figure 3 , in some embodiments of the present invention, one outer surface of the first fusion part 300 is a plane. It can be understood that the two diaphragms 100 are respectively located on both side surfaces of the first fusion part 300. When only one outer surface of the first fusion part 300 is provided with convex parts 400 and concave parts 500, the other outer surface of the first fusion part 300 is a plane, that is, one side of the first fusion part 300 presents a net shape with a plurality of convex parts 400 and a plurality of concave parts 500 crisscrossed. When making the first fusion part 300 with this structure, the first half mold or the second half mold of the mold can adopt a plane structure.

[0039] See Figure 2 In some embodiments of the present invention, the convex portions 400 and the concave portions 500 are provided on both outer surfaces of the first fusion portion 300. It can be understood that when a plurality of convex portions 400 and a plurality of concave portions 500 are provided on both outer surfaces of the first fusion portion 300, a network of a plurality of convex portions 400 and a plurality of concave portions 500 is presented on both outer surfaces of the first fusion portion 300, which is beneficial to enhancing the welding strength of the end portion of the bag mouth and avoiding problems such as poor soldering, insufficient airtightness, and easy tearing between the end portions of the bone strip substrate 200, between the bone strip substrate 200 and the diaphragm 100, and between the side edges of the two diaphragms 100.

[0040] In some embodiments of the present invention, the maximum thickness dimension of the first fusion portion 300 is a, and the minimum thickness dimension of the first fusion portion 300 is b, satisfying: 0.4a ≤ b ≤ 0.9a. It should be noted that when the minimum thickness dimension b of the first fusion portion 300 satisfies the above thickness range, it can not only prevent the two diaphragms 100 from tearing at the junction, which is beneficial to improving the welding strength between the bone strip substrate 200 and the diaphragm 100, but also avoid the breakdown phenomenon caused by the too small minimum thickness dimension of the first fusion portion 300, and prevent the local structural strength from being too low, thereby ensuring the service life and sealing performance of the bag body.

[0041] In some embodiments of the present invention, the convex portion 400 is rectangular, and the side length of the convex portion 400 is 0.2 mm to 3 mm. When the convex portion 400 satisfies the above conditions, the grid sizes formed by the plurality of convex portions 400 and the plurality of concave portions 500 are uniform, and the shapes of the formed convex portions 400 and concave portions 500 are stable. Of course, in other embodiments, the shapes of the convex portion 400 and the concave portion 500 can also be circular, hexagonal, rhombic, etc., and the corresponding dimensions can also be changed accordingly.

[0042] In some embodiments of the present invention, the height dimension of the convex portion 400 is 0.1 mm to 0.5 mm. Through experiments, when the height dimension of the convex portion 400 is 0.1 mm to 0.5 mm, it is applicable to the bag body with a general thickness dimension, and can also ensure the structural strength of the first fusion portion 300 and prevent the bag mouth from being easily torn.

[0043] See Figure 5, in some embodiments of the present utility model, in the direction from the end of the bone strip substrate 200 towards the middle of the bone strip substrate 200, the depth dimension of the concave portion 500 on the first fusion portion 300 gradually becomes shallower. It can be understood that a larger size of the concave portion 500 of the first fusion portion 300 is beneficial for the end of the bone strip substrate 200 to be completely welded to the corresponding diaphragm 100, and is also beneficial for the ends of two bone strip substrates 200 to be completely welded together, while enhancing the structural strength of the side edge of the bag body. The part of the bone strip substrate 200 extending outside the first fusion portion 300 does not need to be welded. Therefore, in the direction towards the middle of the bone strip substrate 200, the depth dimension of the concave portion 500 can gradually become shallower to avoid the bone strip substrate 200 and the first fusion portion 300 from being overly melted together at the junction.

[0044] See Figure 6 , in some embodiments of the present utility model, the first fusion portion 300 has a protection area 700 protruding towards the middle direction of the bone strip substrate 200, and at least part of the contour edge of the protection area 700 has a smooth transition. When the user opens the bag mouth of the bag body, both ends of the bag mouth have a tendency to be torn in the direction of the first fusion portion 300. At this time, the setting of the protection area 700 can further enhance the anti-tearing effect of the bag body. Preferably, the contour edge of the protection area 700 facing the bag mouth has a smooth transition to prevent the two diaphragms 100 from tearing the bag body in half along a certain sharp point. In this embodiment, the upper and lower contour edges of the protection area 700 both have a smooth transition, which can further improve the anti-tearing effect.

[0045] See Figure 6 and Figure 7 , in some embodiments of the present utility model, the first fusion portion 300 is connected with a transition area 800 extending towards the side edge of the bag body. There is a lowest fusion point c between the transition area 800 and the side edge of the bag body, and the transition area 800 gradually becomes wider from the lowest fusion point c towards the direction of the first fusion portion 300. It can be understood that this design is beneficial for the firm connection between the first fusion portion 300 and the side of the bag body, and alleviates the problem that the junction between the diaphragm 100 and the first fusion portion 300 is easily damaged due to the sudden change in the cross-sectional structure.

[0046] See Figure 6 and Figure 7 , in some embodiments of the present utility model, in order to avoid the problem that the connection between the diaphragm 100 and the transition area 800 is weak due to a large difference in the thickness dimension between the transition area 800 and the area composed of two diaphragms 100, the thickness dimension of the transition area 800 gradually becomes thicker from the lowest fusion point c towards the first fusion portion 300.

[0047] See Figure 4, in some embodiments of the present utility model, the bone strip substrate 200 is composed of a sealed bone strip 210 and a bone strip film 220. Two of the bone strip substrates 200 are respectively a male snap bone strip and a female snap bone strip, and there is a height difference between the bone strip film 220 on the male snap bone strip and the bone strip film 220 on the female snap bone strip. It can be understood that the cross-section of the first fusion part 300 along its thickness direction includes a six-layer structure composed of two film sheets 100, two bone strip films 220, a male snap bone strip and a female snap bone strip. The cross-section of the transition area 800 along its thickness direction includes a four-layer structure composed of two film sheets 100 and two bone strip films 220. The area where the bag body is located below the transition area 800 is a double-layer structure composed of two film sheets 100. When switching from the four-layer structure to the double-layer structure, there is a thickness mutation, which is not conducive to the structural stability of the bag body. When there is a height difference between the bone strip film 220 on the male snap bone strip and the bone strip film 220 on the female snap bone strip, the cross-section of the transition area 800 transitions from a four-layer structure to a three-layer structure, and finally to the double-layer structure of the bag body, thereby being able to improve the above technical problem.

[0048] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0049] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A bag mouth welding structure, characterized in that: include: Two films (100) facing each other, the edges of the two films (100) being connected to form a bag body with a bag opening; A bone strip substrate (200) is disposed on the inner surface of the bag opening corresponding to the membrane (100) and is used to open and close the bag opening; The first fusion part (300) is arranged at both ends of the bag opening, and is formed by hot pressing the membrane (100) on the bone strip substrate (200). The first fusion part (300) has a plurality of convex parts (400) and a plurality of concave parts (500), and the plurality of convex parts (400) and the plurality of concave parts (500) are crisscrossed to form a network.

2. A bag opening welding structure according to claim 1, characterized in that: The first fusion portion (300) is connected to a second fusion portion (600) formed on the side edge of the bag body, and the second fusion portion (600) has a plurality of convex portions (400) and a plurality of concave portions (500), and the plurality of convex portions (400) and the plurality of concave portions (500) are crisscrossed to form a network.

3. The bag opening welding structure according to claim 1, characterized in that: One side outer surface of the first fusion portion (300) is a plane.

4. The bag opening welding structure according to claim 1, characterized in that: The outer surfaces of both sides of the first fusion portion (300) are provided with the convex portion (400) and the concave portion (500).

5. The bag opening welding structure according to claim 1, characterized in that: The maximum thickness dimension of the first fusion portion (300) is a, and the minimum thickness dimension of the first fusion portion (300) is b, satisfying: 0.4a≤b≤0.9a.

6. The bag opening welding structure according to claim 1, characterized in that: The convex portion (400) is rectangular, and the side length of the convex portion (400) is 0.2 mm to 3 mm.

7. The bag opening welding structure according to claim 1, characterized in that: The height of the convex portion (400) is 0.1 mm to 0.5 mm.

8. The bag opening welding structure according to claim 1, characterized in that: In a direction from the end of the bone strip base material (200) to the middle of the bone strip base material (200), the depth dimension of the recess (500) on the first fusion part (300) gradually becomes shallower.

9. The bag opening welding structure according to claim 1, characterized in that: The first fusion portion (300) has a protection area (700) protruding toward the middle direction of the bone strip substrate (200), and at least part of the contour edge of the protection area (700) is smoothly transitioned.

10. The bag opening welding structure according to claim 1, characterized in that: The first fusion portion (300) is connected to a transition zone (800) extending toward the side edge of the bag body, and there is a lowest fusion point c between the transition zone (800) and the side edge of the bag body. The transition zone (800) gradually widens from the lowest fusion point c toward the first fusion portion (300).

11. A bag opening welding structure according to claim 10, characterized in that: The thickness of the transition zone (800) gradually increases from the lowest fusion point c toward the first fusion portion (300).

12. The bag opening welding structure according to claim 1, characterized in that: The bone strip substrate (200) is composed of a sealing bone strip (210) and a bone strip film (220); the two bone strip substrates (200) are respectively a male buckle bone strip and a female buckle bone strip; and there is a height difference between the bone strip film (220) on the male buckle bone strip and the bone strip film (220) on the female buckle bone strip.

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