A sealed packaging bag and a method of manufacturing the same
Patent Information
- Application Number
- CN202311230820.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-21
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2043-09-21
AI Technical Summary
The insufficient thickness of the film in existing sealed packaging bags leads to insufficient mechanical strength at the bag opening. The misalignment of the reinforcement strips and sealing grooves affects the sealing performance and makes them prone to damage or heat melting during welding.
Folds are added to the film of the sealed packaging bag, and the reinforcing strips and sealing grooves are set on the inner surface of the folds. The folds are then formed into an integral structure by ultrasonic welding or hot pressing to ensure the positional accuracy and mechanical strength of the reinforcing strips and sealing grooves.
It enhances the mechanical strength of the bag body at the bag opening, ensures accurate engagement of the reinforcing strips and sealing grooves, improves sealing performance, simplifies the production process, and increases production efficiency.
Smart Images
Figure CN117228152B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a sealed packaging bag and a method for manufacturing the same. Background Technology
[0002] A typical sealed packaging bag includes a bag body and a sealing strip assembly located at the bag opening. The bag body is made of two overlapping films welded together, with the two films welded at the bottom and side edges to define the shape of the bag opening. The sealing strip assembly includes a reinforcing strip and a sealing groove that mates with the reinforcing strip. The reinforcing strip and the sealing groove are respectively located on the inner surface of the two films near the bag opening, and the reinforcing strip and the sealing groove need to be arranged parallel to each other, facing each other.
[0003] However, due to the small thickness of the membrane, the mechanical strength of the bag opening formed by the two membranes is insufficient, resulting in a certain deviation between the installation position of the ribs and sealing grooves on the membrane and the preset position. This makes it difficult for the ribs and sealing grooves to mesh, affecting the sealing performance.
[0004] In addition, both ends of the rib strip and the sealing groove strip extend to the two sides of the diaphragm. When welding at the two sides of the two diaphragms, the rib strip and the sealing groove strip are easily crushed or melted by heat, which also makes it impossible to achieve a tight connection between the rib strip and the sealing groove strip. Summary of the Invention
[0005] In order to overcome the shortcomings of the prior art, one objective of the present invention is to provide a sealed packaging bag that can improve the positional accuracy of the first rib and the first sealing groove to enhance the sealing performance; another objective is to provide a method for manufacturing the above-mentioned sealed packaging bag.
[0006] According to an embodiment of the present invention, a sealed packaging bag includes: a bag body, the bag body including a rectangular first film and a rectangular second film arranged face to face, the upper edge of the first film having a downwardly folded first flap, the first flap and the first film opposite to the first flap being stacked to form a first piece group, the upper edge of the second film having a downwardly folded second flap, the second flap and the second film opposite to the second flap being stacked to form a second piece group, a first welding strip being provided between one side of the first film and the second film, and between one side of the first piece group and the second piece group, a second welding strip being provided between the other side of the first film and the second film, and between the other side of the first piece group and the second piece group, the bag opening of the bag body being defined between the first piece group and the second piece group, a first rib being provided on the inner surface of the first piece group, and a first sealing groove being provided on the inner surface of the second piece group cooperating with the first rib.
[0007] The sealed packaging bag according to embodiments of the present invention has at least the following beneficial effects:
[0008] The sealed packaging bag with the above structure has a first fold added to the upper edge of the first film. The first fold and the first film are stacked together to form a first piece group. A second fold is added to the upper edge of the second film. The second fold and the second film are stacked together to form a second piece group. The first rib and the first sealing groove are respectively set on the inner surfaces of the first piece group and the second piece group, thereby enhancing the mechanical strength of the bag body at the bag opening and ensuring the positional accuracy of the first rib and the first sealing groove to improve the sealing performance.
[0009] In some embodiments of the present invention, the first flap is located inside the first piece group, the first rib is disposed on the first flap, the second flap is located inside the second piece group, and the first sealing groove is disposed on the second flap.
[0010] In some embodiments of the present invention, the first bone strip, the first flap and the first diaphragm are an integral plastic structure, and the first sealing groove strip, the second flap and the second diaphragm are an integral plastic structure.
[0011] In some embodiments of the present invention, a first ultrasonic welding strip is provided at the junction of the first rib and the first flap, and the two ends of the first ultrasonic welding strip extend into the regions of the first welding strip and the second welding strip, respectively. A second ultrasonic welding strip is provided at the junction of the first sealing groove and the second flap, and the two ends of the second ultrasonic welding strip extend into the regions of the first welding strip and the second welding strip, respectively.
[0012] In some embodiments of the present invention, the first ultrasonic welding strip extends along the length direction of the first rib, and the first flap and the first diaphragm are welded together by the first ultrasonic welding strip. The second ultrasonic welding strip extends along the length direction of the first sealing groove, and the second flap and the second diaphragm are welded together by the second ultrasonic welding strip. In some embodiments of the present invention, the portion of the first welding strip connecting the first piece group and the second piece group is a first welding area, and the portion of the second welding strip connecting the first piece group and the second piece group is a second welding area. Both ends of the first rib and both ends of the first sealing groove extend to the first welding area and the second welding area, respectively. The first welding area has a first empty portion that avoids one end of the first rib and the first sealing groove, and the second welding area has a second empty portion that avoids one end of the first rib and the first sealing groove.
[0013] In some embodiments of the present invention, the side edges of the first welding area near the bag opening and the side edges of the second welding area near the bag opening are both smoothly transitioned.
[0014] In some embodiments of the present invention, the inner surface of the first piece group is further provided with a second sealing groove, and the inner surface of the second piece group is provided with a second rib that cooperates with the second sealing groove.
[0015] In some embodiments of the present invention, the bag body is provided with an exhaust valve communicating with its inner cavity; or, an outer sealing edge is formed between the bottom edge of the first membrane and the bottom edge of the second membrane, an inner sealing edge is provided between the first membrane and the second membrane located above the outer sealing edge, an exhaust channel is formed between the outer sealing edge and the inner sealing edge, the inner sealing edge is provided with an inner opening communicating with the inner cavity of the bag body and the exhaust channel, and the outer sealing edge is provided with an outer opening communicating with the exhaust channel and the outside.
[0016] A method for manufacturing a sealed packaging bag according to any of the above-described technical solutions according to a second aspect of the present invention includes the following steps:
[0017] The process involves forming a first fold, a second fold, a first rib, and a first sealing groove. The steps of forming the first fold, second fold, first rib, and first sealing groove include manufacturing method one, manufacturing method two, or manufacturing method three. Manufacturing method one involves: setting a downward-folded first fold on the upper edge of a rectangular first membrane, stacking the first fold with the first membrane to form a first sheet group; setting a downward-folded second fold on the upper edge of a rectangular second membrane, stacking the second fold with the second membrane to form a second sheet group; setting a first rib on the inner surface of the first sheet group; and setting a first sealing groove on the inner surface of the second sheet group. Manufacturing method two involves: pre-setting a first rib on a rectangular first membrane; folding the upper edge of the first membrane downward to form a first fold; and stacking the first fold with the first membrane to form a first sealing groove. The first diaphragm is stacked to form the first sheet group. At this time, the first rib is located on the inner surface of the first sheet group. A first sealing groove is preset on the rectangular second diaphragm. The upper edge of the second diaphragm is folded down to form a second fold. The second fold and the second diaphragm are stacked to form the second sheet group. At this time, the first sealing groove is located on the inner surface of the second sheet group. Manufacturing method three: The first rib is set on the first fold, the first sealing groove is set on the second fold, and the first fold and the upper part of the first diaphragm are stacked together to form the first sheet group. At this time, the first rib is located on the inner surface of the first sheet group. The second fold and the upper part of the second diaphragm are stacked together to form the second sheet group. At this time, the first sealing groove is located on the inner surface of the second sheet group.
[0018] Welding forms a bag body; a first welding strip is formed between one side of the first film and the second film, and between one side of the first sheet group and the second sheet group; a second welding strip is formed between the other side of the first film and the second film, and between the other side of the first sheet group and the second sheet group, thereby obtaining a bag body with a bag opening.
[0019] The method for manufacturing a sealed packaging bag according to an embodiment of the present invention has at least the following beneficial effects:
[0020] The sealed packaging bags manufactured using the above methods can enhance the mechanical strength of the bag body at the bag opening, ensure the positional accuracy of the first rib and the first sealing groove, thereby ensuring that the first rib and the first sealing groove can fully engage, and thus improve the sealing performance.
[0021] In some embodiments of the present invention, in one manufacturing method, the first flap is folded downward to the inner surface of the first diaphragm, and the first rib is ultrasonically welded to the inner surface of the first flap to form a first ultrasonic welding strip, which connects the first flap and the first diaphragm together. The second flap is folded downward to the inner surface of the second diaphragm, and the first sealing groove is ultrasonically welded to the inner surface of the second flap to form a second ultrasonic welding strip, which connects the second flap and the second diaphragm together.
[0022] In some embodiments of the present invention, in manufacturing method two, the first rib is pre-set on the upper edge of the first diaphragm by welding or hot pressing, and then the first diaphragm with the first rib is folded inward to form the first flap, and the first flap is welded or hot-pressed onto the upper part of the first diaphragm. The second rib is pre-set on the upper edge of the second diaphragm by welding or hot pressing, and then the second diaphragm with the first sealing groove is folded inward to form the second flap, and the second flap is welded or hot-pressed onto the upper part of the second diaphragm.
[0023] In some embodiments of the present invention, in manufacturing method three, the integral consisting of the first bone strip and the first folded piece and the integral consisting of the first sealing groove strip and the second folded piece are obtained by injection molding. The first folded piece is welded or hot-pressed onto the upper inner surface of the first diaphragm, and the second folded piece is welded or hot-pressed onto the upper inner surface of the second diaphragm.
[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0026] Figure 1 This is a schematic diagram of the structure of a first embodiment of the sealed packaging bag of the present invention;
[0027] Figure 2 yes Figure 1 A schematic diagram of the structure at the bag opening in the embodiment;
[0028] Figure 3 This is a schematic diagram of the structure at the opening of the sealed packaging bag according to Embodiment 2 of the present invention;
[0029] Figure 4 yes Figure 1 A partially enlarged schematic diagram of part A in the embodiment;
[0030] Figure 5 This is a schematic diagram of the structure at the opening of the sealed packaging bag according to Embodiment 3 of the present invention;
[0031] Figure 6 This is a schematic diagram of the structure of Embodiment 4 of the sealed packaging bag of the present invention. Detailed Implementation
[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0033] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", 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 invention 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 limiting this invention.
[0034] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0036] See Figure 1 and Figure 2 A sealed packaging bag according to the present invention includes: a bag body, the bag body including a rectangular first film 10 and a rectangular second film 20 arranged face to face, the upper edge of the first film 10 is provided with a downwardly folded first flap 11, the first flap 11 and the first film 10 opposite to the first flap 11 are stacked to form a first piece group, the upper edge of the second film 20 is provided with a downwardly folded second flap 21, the second flap 21 and the second film 20 opposite to the second flap 21 are stacked to form a second piece group, a first welding strip 30 is provided between one side of the first film 10 and the second film 20, and between one side of the first piece group and the second piece group, a second welding strip 40 is provided between the other side of the first film 10 and the second film 20, and between the other side of the first piece group and the second piece group, the bag opening of the bag body is defined between the first piece group and the second piece group, the inner surface of the first piece group is provided with a first rib 51, and the inner surface of the second piece group is provided with a first sealing groove 52 that cooperates with the first rib 51.
[0037] The sealed packaging bag with the above structure has a first fold 11 added to the upper edge of the first film 10. The first fold 11 and the first film 10 are stacked together to form a first piece group. A second fold 21 is added to the upper edge of the second film 20. The second fold 21 and the second film 20 are stacked together to form a second piece group. The first rib 51 and the first sealing groove 52 are respectively set on the inner surfaces of the first piece group and the second piece group, thereby enhancing the mechanical strength of the bag body at the bag opening and ensuring the positional accuracy of the first rib 51 and the first sealing groove 52 to improve the sealing performance.
[0038] See Figure 2In some embodiments of the present invention, the first fold 11 is located inside the first piece group, the first rib 51 is disposed on the first fold 11, the second fold 21 is located inside the second piece group, and the first sealing groove 52 is disposed on the second fold 21. It should be noted that the first fold 11 being disposed on the inner surface of the first diaphragm 10 and the first rib 51 being disposed on the first fold 11 not only enhances the mechanical strength of the mounting position of the first rib 51, but also, since both the first fold 11 and the first rib 51 are located inside the first diaphragm 10, the steps for positioning and fixing the first fold 11 and the first rib 51 are reduced, simplifying the production process and facilitating processing. Of course, see also... Figure 3 In other embodiments, the first flap 11 may be disposed on the outside of the first piece group. In this case, the first rib 51 is disposed on the inner surface of the first diaphragm 10. In this state, the overall mechanical strength of the first flap 11 and the first diaphragm 10 is still improved, thereby ensuring the accuracy of the position of the first rib 51 and the first sealing groove 52, and ensuring that the first rib 51 and the first sealing groove 52 can be smoothly engaged.
[0039] In some embodiments of the present invention, the first rib 51, the first flap 11, and the first diaphragm 10 are integral plastic structures, and the first sealing groove 52, the second flap 21, and the second diaphragm 20 are integral plastic structures. It should be noted that the integral plastic structure referred to herein can be either a structure in which each component is made of plastic and formed by welding or hot pressing, or a structure obtained in one step through injection molding.
[0040] See Figure 2 In some embodiments of the present invention, a first ultrasonic welding strip 60 is provided at the joint between the first rib 51 and the first flap 11, with both ends of the first ultrasonic welding strip 60 extending into the areas of the first welding strip 30 and the second welding strip 40, respectively. A second ultrasonic welding strip 70 is provided at the joint between the first sealing groove 52 and the second flap 21, with both ends of the second ultrasonic welding strip 70 extending into the areas of the first welding strip 30 and the second welding strip 40, respectively. It should be noted that the first rib 51 and the first flap 11, and the first sealing groove 52 and the second flap 21, need to be tightly joined to ensure that external gas does not enter the bag body through any gaps. Ultrasonic welding has the characteristics of fast welding speed, high welding strength, and good sealing performance. The thickness of the first ultrasonic welding strip 60 and the second ultrasonic welding strip 70 is uniform to promote the first rib 51 and the first sealing groove 52 to be arranged as straight as possible, reducing twisting. Both ends of the first ultrasonic welding strip 60 and the second ultrasonic welding strip 70 extend into the areas of the first welding strip 30 and the second welding strip 40, respectively, to prevent air leakage.
[0041] See Figure 4 In some embodiments of the present invention, the first ultrasonic welding ribbon 60 extends along the length direction of the first rib 51, the first flap 11 and the first diaphragm 10 are welded together by the first ultrasonic welding ribbon 60, and the second ultrasonic welding ribbon 70 extends along the length direction of the first sealing groove 52, the second flap 21 and the second diaphragm 20 are welded together by the second ultrasonic welding ribbon 70. It is understood that the first ultrasonic welding ribbon 60 is formed when the first rib 51 is welded onto the first flap 11. This first ultrasonic welding ribbon 60 can simultaneously weld together a portion of the first flap 11 and a portion of the first diaphragm 10 that overlap with the first rib 51, that is, the first rib 51, the first flap 11, and the first diaphragm 10 can be connected in one step. When the first sealing groove 52 is welded onto the second flap 21, a second ultrasonic welding strip 70 is formed. This second ultrasonic welding strip 70 can simultaneously weld together the portion of the second flap 21 that overlaps with the first sealing groove 52 and a portion of the second diaphragm 20. In other words, the first sealing groove 52, the second flap 21, and the second diaphragm 20 can be connected in a single step. This greatly simplifies the production process and improves production efficiency.
[0042] See Figure 1 and Figure 4In some embodiments of the present invention, the portion of the first welding strip 30 connecting the first sheet group and the second sheet group is a first welding area 31, and the portion of the second welding strip 40 connecting the first sheet group and the second sheet group is a second welding area 41. Both ends of the first rib 51 and both ends of the first sealing groove 52 extend to the first welding area 31 and the second welding area 41, respectively. The first welding area 31 has a first empty portion that avoids one end of the first rib 51 and the first sealing groove 52, and the second welding area 41 has a second empty portion that avoids one end of the first rib 51 and the first sealing groove 52. It should be noted that during the production process of the sealed packaging bag, a welding mold is required to abut between the first film 10 and the second film 20 to form the first welding strip 30 and the second welding strip 40. If the welding mold directly applies pressure to the first rib 51 and the first sealing groove 52, the first rib 51 and the first sealing groove 52 will be flattened or deformed by heat melting, ultimately affecting the sealing performance of the ends when the first rib 51 and the first sealing groove 52 are combined. The first welding area 31 and the second welding area 41 of the above structure avoid the first rib 51 and the first sealing groove 52 respectively through the first empty portion and the second empty portion. Correspondingly, the welding mold reserves the avoidance space that matches the shape of the first rib 51 and the first sealing groove 52, thereby forming the first welding area 31 and the second welding area 41 around the ends of the first rib 51 and the first sealing groove 52, ensuring that the shape of the first rib 51 and the first sealing groove 52 is not destroyed, and thus ensuring that the first rib 51 and the first sealing groove 52 can be tightly joined. Preferably, the first welding area 31 partially overlaps with one end of the first ultrasonic welding strip 60 and one end of the second ultrasonic welding strip 70, and the second welding area 41 partially overlaps with the other end of the first ultrasonic welding strip 60 and the other end of the second ultrasonic welding strip 70.
[0043] See Figure 1 and Figure 4 In some embodiments of the present invention, in order to prevent the first welding area 31 and the second welding area 41 from being easily torn and damaged when the bag is opened, the side edges of the first welding area 31 and the second welding area 41 near the bag opening are both smoothly transitioned, that is, the side edges of the first welding area 31 and the second welding area 41 near the bag opening do not have sharp points.
[0044] See Figure 5In some embodiments of the present invention, the inner surface of the first piece group is further provided with a second sealing groove 81, and the inner surface of the second piece group is provided with a second rib 82 that cooperates with the second sealing groove 81. It can be understood that the first rib 51 and the first sealing groove 52 form one sealing chain, and the second rib 82 and the second sealing groove 81 form another sealing chain, achieving double protection of airtightness by setting two sets of sealing chains. Of course, in other embodiments, three or more sets of sealing chains can be configured. Moreover, in this embodiment, because the first rib 51 and the second rib 82 are arranged alternately, and the first sealing groove 52 and the second sealing groove 81 are arranged alternately, the bag opening is not easily opened when the first rib 51 is engaged with the first sealing groove 52 and the second rib 82 is engaged with the second sealing groove 81.
[0045] See Figure 1 In some embodiments of the present invention, the bag body is provided with an exhaust valve 91 communicating with its inner cavity, and the exhaust valve 91 is a conventional one-way valve; or, see Figure 6 An outer sealing edge 92 is formed between the bottom edge of the first diaphragm 10 and the bottom edge of the second diaphragm 20. An inner sealing edge 93 is provided between the first diaphragm 10 and the second diaphragm 20, located above the outer sealing edge 92. An exhaust channel 94 is formed between the outer sealing edge 92 and the inner sealing edge 93. The inner sealing edge 93 has an inner opening 95 that connects the inner cavity of the bag body to the exhaust channel 94. The outer sealing edge 92 has an outer opening 96 that connects the exhaust channel 94 to the outside. Gas inside the bag can be discharged to the outside of the bag body by sequentially passing through the inner opening 95, the exhaust channel 94, and the outer opening 96. All of the above structures can extract gas from the sealed packaging bag, realizing the function of a vacuum storage bag.
[0046] This invention also discloses a method for manufacturing a sealed packaging bag according to any of the above-mentioned technical solutions, comprising the following steps:
[0047] The process involves forming a first fold 11, a second fold 21, a first rib 51, and a first sealing groove 52. The steps of forming the first fold 11, second fold 21, first rib 51, and first sealing groove 52 include manufacturing method one, manufacturing method two, or manufacturing method three. Manufacturing method one involves: setting a downward-folded first fold 11 on the upper edge of a rectangular first membrane 10, with the first fold 11 and the first membrane 10 stacked to form a first sheet group; setting a downward-folded second fold 21 on the upper edge of a rectangular second membrane 20, with the second fold 21 and the second membrane 20 stacked to form a second sheet group; setting a first rib 51 on the inner surface of the first sheet group; and setting a first sealing groove 52 on the inner surface of the second sheet group. Manufacturing method two involves: pre-setting a first rib 51 on a rectangular first membrane 10; folding the upper edge of the first membrane 10 downwards to form the first fold 11; and setting the first fold 11, second fold 21, first rib 51, and first sealing groove 52 on the inner surface of the second sheet group. The first sheet 11 and the first diaphragm 10 are stacked together to form the first sheet group. At this time, the first rib 51 is located on the inner surface of the first sheet group. A first sealing groove 52 is preset on the rectangular second diaphragm 20. The upper edge of the second diaphragm 20 is folded down to form a second fold 21. The second fold 21 and the second diaphragm 20 are stacked together to form the second sheet group. At this time, the first sealing groove 52 is located on the inner surface of the second sheet group. Manufacturing method three: The first rib 51 is set on the first fold 11, the first sealing groove 52 is set on the second fold 21, the first fold 11 and the upper part of the first diaphragm 10 are stacked together to form the first sheet group. At this time, the first rib 51 is located on the inner surface of the first sheet group. The second fold 21 and the upper part of the second diaphragm 20 are stacked together to form the second sheet group. At this time, the first sealing groove 52 is located on the inner surface of the second sheet group.
[0048] A bag body is formed by welding; a first welding strip 30 is formed by welding between one side of the first membrane 10 and the second membrane 20, and between one side of the first sheet group and the second sheet group; a second welding strip 40 is formed by welding between the other side of the first membrane 10 and the second membrane 20, and between the other side of the first sheet group and the second sheet group, thereby obtaining a bag body with a bag opening.
[0049] Understandably, during the production of this sealed packaging bag, any one of the following methods—method 1, method 2, or method 3—is used to form the first fold 11 and the first rib 51 on the first film 10, and the second fold 21 and the first sealing groove 52 on the second film 20. See details [link to details]. Figure 2 Then, the first diaphragm 10 is welded to both sides of the second diaphragm 20 to form a first weld strip 30 and a second weld strip 40, thereby forming [see reference]. Figure 1The bag body. The sealed packaging bag manufactured by the above manufacturing method can enhance the mechanical strength of the bag body at the bag opening, ensure the positional accuracy of the first rib 51 and the first sealing groove 52, thereby ensuring that the first rib 51 and the first sealing groove 52 can fully engage, thus improving the sealing performance.
[0050] In some embodiments of the present invention, in manufacturing method one, the first flap 11 is folded downward to the inner surface of the first diaphragm 10, and the first rib 51 is ultrasonically welded to the inner surface of the first flap 11 to form a first ultrasonic welding strip 60, which connects the first flap 11 and the first diaphragm 10 together. The second flap 21 is folded downward to the inner surface of the second diaphragm 20, and the first sealing groove 52 is ultrasonically welded to the inner surface of the second flap 21 to form a second ultrasonic welding strip 70, which connects the second flap 21 and the second diaphragm 20 together. The first ultrasonic welding strip 60 can be welded together with the first rib 51, the first flap 11, and the first diaphragm 10, meaning that the connection of the first rib 51, the first flap 11, and the first diaphragm 10 can be achieved in one step. Similarly, the second ultrasonic welding strip 70 can be welded together with the first sealing groove 52, the second flap 21, and the second diaphragm 20, meaning that the connection of the first sealing groove 52, the second flap 21, and the second diaphragm 20 can be achieved in one step. This manufacturing method greatly simplifies the production process and improves production efficiency.
[0051] In some embodiments of the present invention, in manufacturing method two, the first rib 51 is pre-formed on the upper edge of the first diaphragm 10 by welding or hot pressing. Then, the first diaphragm 10 with the first rib 51 is folded inward to form the first flap 11. The first flap 11 is welded or hot-pressed onto the upper part of the first diaphragm 10. The second rib 82 is pre-formed on the upper edge of the second diaphragm 20 by welding or hot pressing. Then, the second diaphragm 20 with the first sealing groove 52 is folded inward to form the second flap 21. The second flap 21 is welded or hot-pressed onto the upper part of the second diaphragm 20. Using the above-described manufacturing method two avoids the problem of the first flap 11 shifting relative to the first diaphragm 10 before welding the first rib 51, which would otherwise occur. It also avoids the problem of the second flap 21 shifting relative to the second diaphragm 20 before welding the first sealing groove 52, which would otherwise occur.
[0052] In some embodiments of the present invention, in manufacturing method three, the integral consisting of the first bone strip 51 and the first flap 11, and the integral consisting of the first sealing groove strip 52 and the second flap 21 are obtained by injection molding. The first flap 11 is welded or hot-pressed onto the upper inner surface of the first diaphragm 10, and the second flap 21 is welded or hot-pressed onto the upper inner surface of the second diaphragm 20. Using the above-described manufacturing method three helps to reduce production difficulty.
[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.
[0054] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A sealed packaging bag, characterized in that, include: The bag body includes a rectangular first membrane (10) and a rectangular second membrane (20) arranged face to face. The upper edge of the first membrane (10) is provided with a downwardly folded first flap (11). The first flap (11) and the first membrane (10) opposite to the first flap (11) are stacked to form a first piece group. The upper edge of the second membrane (20) is provided with a downwardly folded second flap (21). The second flap (21) and the second membrane (20) opposite to the second flap (21) are stacked to form a second piece group. A first welding strip (30) is provided between one side of the first membrane (10) and the second membrane (20), and between one side of the first piece group and the second piece group. A welding strip (30) is provided between the other side of the first membrane (10) and the second membrane (20), and between the first piece group and the second piece group. A second welding strip (40) is provided between the other side of the sheet group. The bag opening of the bag body is defined between the first sheet group and the second sheet group. A first bone strip (51) is provided on the inner surface of the first sheet group. A first sealing groove strip (52) that cooperates with the first bone strip (51) is provided on the inner surface of the second sheet group. The first bone strip (51), the first fold (11), and the first diaphragm (10) are an integral plastic structure. The first sealing groove strip (52), the second fold (21), and the second diaphragm (20) are an integral plastic structure. The integral plastic structure is formed by using plastic material for each component and forming an integral structure by welding or hot pressing. The first fold (11) is welded or hot-pressed onto the inner surface of the upper part of the first diaphragm (10). The second fold (21) is welded or hot-pressed onto the inner surface of the upper part of the second diaphragm (20). The portion of the first welding strip (30) that connects the first piece group and the second piece group is the first welding area (31), and the portion of the second welding strip (40) that connects the first piece group and the second piece group is the second welding area (41). Both ends of the first rib (51) and both ends of the first sealing groove (52) extend to the first welding area (31) and the second welding area (41) respectively. The first welding area (31) has a first empty portion that avoids one end of the first rib (51) and the first sealing groove (52), and the second welding area (41) has a second empty portion that avoids one end of the first rib (51) and the first sealing groove (52).
2. The sealed packaging bag according to claim 1, characterized in that: The first flap (11) is located inside the first piece group, the first bone strip (51) is disposed on the first flap (11), the second flap (21) is located inside the second piece group, and the first sealing groove strip (52) is disposed on the second flap (21).
3. A sealed packaging bag according to claim 2, characterized in that: The first bone strip (51) and the first flap (11) are provided with a first ultrasonic welding strip (60), and the two ends of the first ultrasonic welding strip (60) extend into the areas of the first welding strip (30) and the second welding strip (40), respectively. The first sealing groove strip (52) and the second flap (21) are provided with a second ultrasonic welding strip (70), and the two ends of the second ultrasonic welding strip (70) extend into the areas of the first welding strip (30) and the second welding strip (40), respectively.
4. A sealed packaging bag according to claim 3, characterized in that: The first ultrasonic welding strip (60) extends along the length direction of the first rib (51), the first flap (11) and the first diaphragm (10) are welded together by the first ultrasonic welding strip (60), the second ultrasonic welding strip (70) extends along the length direction of the first sealing groove (52), and the second flap (21) and the second diaphragm (20) are welded together by the second ultrasonic welding strip (70).
5. A sealed packaging bag according to claim 1, characterized in that: The first welding area (31) near the side edge of the bag opening and the second welding area (41) near the side edge of the bag opening are both smoothly transitioned.
6. A sealed packaging bag according to claim 1, characterized in that: The inner surface of the first piece group is also provided with a second sealing groove (81), and the inner surface of the second piece group is provided with a second bone strip (82) that cooperates with the second sealing groove (81).
7. A sealed packaging bag according to claim 1, characterized in that: The bag body is provided with an exhaust valve (91) communicating with its inner cavity; or, an outer sealing edge (92) is formed between the bottom edge of the first membrane (10) and the bottom edge of the second membrane (20), and an inner sealing edge (93) is provided between the first membrane (10) and the second membrane (20) located above the outer sealing edge (92), and an exhaust channel (94) is formed between the outer sealing edge (92) and the inner sealing edge (93), and the inner sealing edge (93) is provided with an inner opening (95) communicating with the inner cavity of the bag body and the exhaust channel (94), and the outer sealing edge (92) is provided with an outer opening (96) communicating with the exhaust channel (94) and the outside.
8. A method for manufacturing a sealed packaging bag as described in any one of claims 1-7, characterized in that, Includes the following steps: The process of forming a first fold (11), a second fold (21), a first rib (51), and a first sealing groove (52) includes three manufacturing methods: manufacturing method one, manufacturing method two, and manufacturing method three. Manufacturing method one involves setting a downward-folded first fold (11) on the upper edge of a rectangular first membrane (10), with the first fold (11) and the first membrane (10) stacked together to form the first fold. The first sheet group has a second folded flap (21) folded downwards on the upper edge of a rectangular second diaphragm (20). The second folded flap (21) and the second diaphragm (20) are stacked to form the second sheet group. A first rib (51) is provided on the inner surface of the first sheet group, and a first sealing groove (52) is provided on the inner surface of the second sheet group. Manufacturing method two: A first rib (51) is preset on a rectangular first diaphragm (10), and the upper edge of the first diaphragm (10) is folded downwards to form a first folded flap (11). A folded piece (11) is stacked with the first diaphragm (10) to form the first piece group. At this time, the first bone strip (51) is located on the inner surface of the first piece group. A first sealing groove (52) is preset on the rectangular second diaphragm (20). The upper edge of the second diaphragm (20) is folded down to form a second folded piece (21). The second folded piece (21) is stacked with the second diaphragm (20) to form the second piece group. At this time, the first sealing groove (52) is located on the inner surface of the second piece group. Manufacturing method 3: The first bone strip (51) is placed on the first fold (11), the first sealing groove strip (52) is placed on the second fold (21), and the first fold (11) and the upper part of the first diaphragm (10) are stacked together to form the first piece group. At this time, the first bone strip (51) is located on the inner surface of the first piece group. The second fold (21) and the upper part of the second diaphragm (20) are stacked together to form the second piece group. At this time, the first sealing groove strip (52) is located on the inner surface of the second piece group. A bag body is formed by welding; a first welding strip (30) is formed between one side of the first membrane (10) and the second membrane (20) and between one side of the first sheet group and the second sheet group; a second welding strip (40) is formed between the other side of the first membrane (10) and the second membrane (20) and between the other side of the first sheet group and the second sheet group, thereby obtaining a bag body with a bag opening.
9. A method for manufacturing a sealed packaging bag according to claim 8, characterized in that, In the first manufacturing method, the first flap (11) is folded down to the inner surface of the first diaphragm (10), and the first bone strip (51) is ultrasonically welded to the inner surface of the first flap (11) to form a first ultrasonic welding strip (60). The first ultrasonic welding strip (60) connects the first flap (11) and the first diaphragm (10) together. The second flap (21) is folded down to the inner surface of the second diaphragm (20), and the first sealing groove strip (52) is ultrasonically welded to the inner surface of the second flap (21) to form a second ultrasonic welding strip (70). The second ultrasonic welding strip (70) connects the second flap (21) and the second diaphragm (20) together.
10. A method for manufacturing a sealed packaging bag according to claim 8, characterized in that, In the second manufacturing method, the first rib (51) is pre-set on the upper edge of the first diaphragm (10) by welding or hot pressing. Then, the first diaphragm (10) with the first rib (51) is folded inward to form the first flap (11). The first flap (11) is welded or hot-pressed onto the upper part of the first diaphragm (10). The second rib (82) is pre-set on the upper edge of the second diaphragm (20) by welding or hot pressing. Then, the second diaphragm (20) with the first sealing groove (52) is folded inward to form the second flap (21). The second flap (21) is welded or hot-pressed onto the upper part of the second diaphragm (20).
11. A method for manufacturing a sealed packaging bag according to claim 8, characterized in that, In the third manufacturing method, the first bone strip (51) and the first fold (11) are formed by injection molding, and the first sealing groove strip (52) and the second fold (21) are formed by injection molding. The first fold (11) is welded or hot-pressed onto the upper inner surface of the first diaphragm (10), and the second fold (21) is welded or hot-pressed onto the upper inner surface of the second diaphragm (20).
Citation Information
Patent Citations
Leak proof closure device with spring member
CN101426690A
Simple thermal insulation bag
JP1994025145U
Synthetic resin bag
JP2010076830A