A soft bag package

Abstract

The application relates to a soft bag package, relates to the technical field of packaging containers, and comprises a bag body formed by a composite film into a tubular shape and through heat pressing of an end portion, a discharge nozzle fixed to the top of the bag body through heat pressing, and a cap installed on the discharge nozzle, the composite film adopts a functional layered structure with an inner layer of high rigidity and high barrier and an outer layer of high heat sealing property and high flexibility, the discharge nozzle is connected with the bag body through heat pressing, and the cap realizes double sealing of a discharging channel through thread connection and an elastic sealing column. The application solves the problems of complex production process and insufficient assembly connection reliability of traditional soft bag packages through optimization of overall structure design and production process, and has the advantages of simple structure, reliable sealing, high production efficiency and low cost.

Description

Technical Field

[0001] This application relates to the technical field of packaging containers, and in particular to a flexible bag packaging. Background Technology

[0002] In the cosmetics packaging industry, flexible pouches are widely used for packaging liquid or semi-liquid contents such as lotions, gels, and serums due to their advantages such as low cost, ease of compression, and minimal residue. Traditional flexible pouches are mostly manufactured using injection molding or blow molding processes. These processes first require the creation of precision molds, followed by injection molding to inject molten plastic into the mold cavity, or blow molding to inflate the preform into shape. Finally, the packaging is completed through multiple processes including cooling and trimming. These traditional methods not only involve high mold costs but also have a cumbersome and complex overall process, long production cycles, and high energy consumption, hindering cost control and efficiency improvement.

[0003] Furthermore, existing flexible pouch packaging suffers from deficiencies in the integration of overall structural design and manufacturing processes. Steps such as pouch forming and connection to the nozzle are often fragmented or rely on complex component assembly, making it difficult to complete through an efficient, seamless process flow. This leads to bottlenecks in production efficiency and may also introduce potential weaknesses in connections and quality risks due to multiple complex assembly steps. Therefore, there is an urgent need in the field for a flexible pouch packaging solution that integrates pouch forming and key component connection into a simplified process flow, aiming to reduce production costs while ensuring the overall structural integrity and reliability of the packaging. Utility Model Content

[0004] To address the issues of complex manufacturing processes and insufficient reliability of key connection points in existing flexible bag packaging, this application provides a flexible bag packaging solution.

[0005] This application provides a flexible bag packaging solution, which adopts the following technical solution: A flexible bag packaging includes a bag body formed by wrapping a composite film into a cylindrical shape and hot-pressing the ends, a dispensing nozzle, and a cap installed on the dispensing nozzle. The tail of the bag body is provided with a tail sealing section formed by heat sealing. The dispensing nozzle is hot-pressed and fixed to the top of the bag body. The cap is disposed on the dispensing nozzle and is used to seal the dispensing nozzle.

[0006] By adopting the above technical solution, the composite film is wrapped around and hot-pressed to form a cylindrical bag body, and combined with the hot-pressed and fixed discharge nozzle and cap, the basic structure of the soft bag packaging is constructed. In this way, the hot-pressing and heat-sealing processes are used to achieve reliable connection and sealing between the components, thereby achieving the technical effects of simplifying the production process, ensuring basic sealing performance, and reducing manufacturing costs.

[0007] Furthermore, the composite membrane is composed of an inner layer and an outer layer, with the inner layer having greater rigidity and barrier properties against oxygen and water vapor than the outer layer.

[0008] By adopting the above technical solution, a composite membrane structure with a high-rigidity and high-barrier inner layer and a high-flexibility outer layer is used to achieve an optimized configuration of material functions. The inner layer undertakes the functions of structural support and protection of contents, while the outer layer ensures the user experience, thus achieving a technical effect that balances packaging strength, shelf life and production efficiency.

[0009] Furthermore, the discharge nozzle is provided with a discharge channel, and the cover includes a connecting part with internal threads and a cover plate. The connecting part is threadedly connected to the discharge nozzle, and the cover plate is hinged to the connecting part and used to seal the port of the discharge channel.

[0010] By adopting the above technical solution, a discharge channel is set in the discharge nozzle, and a cover structure with threaded connection and hinged cover plate is adopted to establish a sealing mechanism that can be repeatedly opened and closed, thereby achieving the technical effect of ensuring sealing reliability and facilitating users to take out the contents.

[0011] Furthermore, the inner side of the cover plate is provided with an elastic sealing post. When the cover plate is closed, the sealing post extends into and tightly fits the inner wall of the discharge channel to achieve a seal.

[0012] By adopting the above technical solution, an elastic sealing column is set on the inner side of the cover plate, forming an insertion seal when the cover plate is closed. The elastic deformation of the sealing column tightly fits the inner wall of the discharge channel, and at the same time, the deformation resistance generates an auxiliary locking effect, achieving the dual technical effect of enhancing the sealing effect and preventing accidental opening.

[0013] Furthermore, the discharge nozzle includes a base with an integrated sealing structure and a connector. The base is heat-pressed to the bag body, and the connector is threadedly sealed to the connecting part.

[0014] By adopting the above technical solution, the discharge nozzle with an integrated sealing structure integrates the base and the connector to form a reliable thermo-press connection with the bag body. The connector ensures a stable fit with the cap, thereby achieving the technical effects of improving the overall integrity of the component, avoiding interface leakage, and simplifying the assembly process.

[0015] Furthermore, the connecting part extends towards the base to form a pressing sleeve, which includes a pressure ring for pressing against the top plane of the base and a collar for wrapping the outer wall of the base. The pressure ring and the collar are an integral structure.

[0016] By adopting the above technical solution, a pressure sleeve with a pressure ring and a collar is extended into the connection part to form a covering structure for the base. When the cap is tightened, the pressure sleeve applies a clamping force from the top and the side at the same time, which achieves the technical effect of enhancing the connection stability of the discharge nozzle, dispersing stress and preventing the connection from loosening.

[0017] Furthermore, an annular groove is formed on the upper surface of the base, and the bag body is hot-pressed and fixed in the annular groove.

[0018] By adopting the above technical solution, an annular groove is opened on the upper surface of the base to provide positioning and accommodation space for hot pressing connection. In turn, the connection is strengthened by increasing the contact area and mechanical fitting depth, which achieves the technical effect of significantly improving the bonding strength and anti-peeling ability between the discharge nozzle and the bag body.

[0019] Furthermore, an annular pressure plate is slidably disposed in the annular groove along the depth direction of the annular groove, and multiple sets of elastic pressure blocks are arranged in a circumferential array at the bottom of the pressure ring. When the pressure sleeve is pressed, the multiple sets of elastic pressure blocks undergo compression deformation and jointly push the annular pressure plate to tightly adhere to the bag body in the annular groove.

[0020] By adopting the above technical solution, the synergistic effect of the sliding annular pressure plate and the array of elastic pressure blocks establishes a dynamic pressing mechanism. This mechanism utilizes the continuous deformation pressure of the elastic pressure blocks to push the pressure plate to uniformly press the heat-sealing area, achieving the technical effect of adaptively compensating for stress relaxation and ensuring long-term sealing stability.

[0021] Furthermore, at least one annular sealing groove is provided on the outer wall of the base, and an elastic sealing ring is detachably provided in the annular sealing groove. The bag body is hot-pressed and embedded in the annular sealing groove, and the inner wall of the collar presses the elastic sealing ring against the bag body in the annular sealing groove.

[0022] By adopting the above technical solution, an annular sealing groove with an elastic sealing ring is set on the side wall of the base to construct a radial mechanical locking structure. In this way, the sealing ring is squeezed by the collar to generate radial expansion force, so that the bag material is tightly embedded, achieving the technical effect of forming multiple sealing defenses and significantly improving vibration resistance and peel resistance.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By directly wrapping the composite film around the bag body with hot pressing, and using hot pressing and heat sealing processes to connect the discharge nozzle and the sealing tail, the traditional injection molding or blow molding method is replaced, which significantly simplifies the production process and reduces equipment investment and manufacturing costs.

[0024] 2. By setting up elastic pressure blocks and elastic sealing rings, a continuous and adaptive clamping force is generated on the heat-sealed area when the cap is locked. This can effectively compensate for the decrease in sealing pressure caused by vibration, stress relaxation or material deformation, and greatly improve the sealing performance during long-term use and transportation.

[0025] 3. Through the synergistic effect of the heat-sealing between the discharge nozzle and the bag body, the threaded locking of the cap, the axial sealing of the sealing column, and the mechanical interlocking structure, a multi-layered, three-dimensional sealing and connection system is formed, which significantly enhances the overall sealing of the packaging and the connection strength of the discharge nozzle, effectively preventing leakage and accidental separation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the flexible bag packaging according to Embodiment 1 of this application; Figure 2 This is a half-sectional structural diagram of Embodiment 1 of this application; Figure 3 This is a half-sectional structural diagram of Embodiment 2 of this application; Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0027] Reference numerals: 1. Bag body; 11. Tail sealing section; 2. Discharge nozzle; 21. Base; 211. Annular groove; 212. Annular sealing groove; 22. Connector; 23. Discharge channel; 3. Cover; 31. Connecting part; 32. Cover plate; 33. Sealing column; 4. Pressure sleeve; 41. Pressure ring; 411. Elastic pressure block; 42. Collar; 5. Annular pressure plate; 6. Sealing ring. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0029] This application discloses a flexible bag packaging.

[0030] Example 1 Reference Figure 1 A soft bag packaging includes a bag body 1 formed by wrapping a composite film into a cylindrical shape and hot-pressing the ends, a dispensing nozzle 2, and a cap 3 installed on the dispensing nozzle 2. The tail of the bag body 1 is provided with a tail sealing section 11 formed by heat sealing. The dispensing nozzle 2 is hot-pressed and fixed to the top of the bag body 1. The cap 3 is disposed on the dispensing nozzle 2 and is used to seal the dispensing nozzle 2.

[0031] Reference Figure 1The bag body 1 is formed by wrapping a composite film into a cylindrical shape and hot-pressing its ends, resulting in a cylindrical structure with open ends. At the tail of the bag body 1, a tail sealing section 11 is formed through a heat-sealing process, ensuring complete sealing of the packaging after filling with the contents. The composite film consists of an inner layer and an outer layer. The inner layer is in direct contact with the liquid inside the bag body 1, while the outer layer is in direct contact with the external air. The inner layer material has significantly greater rigidity and barrier properties against oxygen and water vapor than the outer layer; conversely, the outer layer material has significantly greater flexibility than the inner layer. This functional material combination allows the inner layer of the bag body 1 to provide necessary structural support for the packaging and effectively protect the contents, while the outer layer ensures a flexible feel in the final packaging. In this embodiment, the inner layer of the composite film is made of PET material, and the outer layer is made of PP material.

[0032] Reference Figure 2 The discharge nozzle 2 is heat-pressed and fixed to the top of the bag body 1. The discharge nozzle 2 adopts an integrated sealing structure, including a base 21 heat-pressed to the bag body 1 and a connector 22 for connection. A discharge channel 23 is opened inside the discharge nozzle 2. The cap 3 is installed on the discharge nozzle 2, and its core function is to seal the discharge nozzle 2. Specifically, the cap 3 includes a connecting part 31 with internal threads and a cover plate 32. The connecting part 31 is connected to the connector 22 of the discharge nozzle 2 by threads, while the cover plate 32 is hinged to the connecting part 31 and can be flexibly opened and closed to seal or open the port of the discharge channel 23.

[0033] Reference Figure 2 To further enhance the sealing effect, an elastic sealing post 33 is provided on the inner side of the cover plate 32. When the cover plate 32 is closed, this sealing post 33 extends into and tightly fits the inner wall of the discharge channel 23, thereby forming an effective internal sealing barrier to prevent leakage. Simultaneously, because the sealing post 33 extends into the discharge channel 23, the rotation of the cover plate 32 causes the sealing post 33 to undergo a certain elastic deformation, thereby allowing the sealing post 33 to move out of the discharge channel 23. Therefore, the sealing post 33 also has a certain locking effect on the cover plate 32. Specifically, when the cover plate 32 is opened, a force is applied that causes the sealing post 33 to elastically deform and move out of the discharge channel 23 to rotate the cover plate 32. In this embodiment, to reduce the diameter of the sealing post 33, an outlet coaxial with the discharge channel 23 is provided in the connecting part 31, and the sealing post 33 fits tightly against the inner wall of the outlet.

[0034] Reference Figure 2Furthermore, the connecting portion 31 of the cap 3 extends towards the base 21, forming an integral pressure sleeve 4. This pressure sleeve 4 further includes a pressure ring 41 for pressing against the top plane of the base 21 and a collar 42 for wrapping the outer wall of the base 21; when the connecting portion 31 is tightened on the discharge nozzle 2, this pressure sleeve 4 can apply pressure to the base 21 from above and the side at the same time, which helps to stabilize the connection structure between the discharge nozzle 2 and the bag body 1.

[0035] The working principle of Embodiment 1 of this application is as follows: By hot-pressing complementary composite films to form the bag body 1, the production process is simplified. The outlet 2 is hot-pressed onto the top of the bag body 1 to form the primary seal, while the cap 3, through the synergistic action of threaded locking and elastic sealing post 33, establishes a reliable secondary seal at the outlet channel 23. The overall structure optimizes production costs and efficiency while ensuring basic sealing performance, making it particularly suitable for cost-sensitive conventional cosmetic packaging needs.

[0036] Example 2 Reference Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that an annular groove 211 is provided on the upper surface of the base 21. When the bag body 1 is heat-pressed to the base 21, its material is fixed in this annular groove 211. This design increases the contact area and path between the bag body 1 and the discharge nozzle 2, structurally enhancing the strength of the connection.

[0037] Reference Figure 4 To further enhance the seal at the connection point, an annular pressure plate 5, which can slide along the depth direction, is provided within the annular groove 211. Simultaneously, at the bottom of the pressure ring 41 of the pressure sleeve 4, multiple sets of elastic pressure blocks 411 are arranged in a circumferential array. When the connecting part 31 of the cap 3 is tightened and the pressure sleeve 4 moves downward, these elastic pressure blocks 411 first contact the annular pressure plate 5 and undergo compression deformation. The continuous pressure generated by these elastic pressure blocks 411 collectively pushes the annular pressure plate 5, causing it to tightly adhere to the bag body 1 material within the annular groove 211. This design provides a dynamic, adaptive clamping force that effectively compensates for vibrations or stress relaxation that may occur during transportation and use, ensuring that the heat-sealed area is always under pressure, thereby greatly reducing the risk of accidental separation at the connection point.

[0038] Reference Figure 4As another parallel optimization measure, at least one annular sealing groove 212 is formed on the outer wall of the base 21. The bag body 1 is also embedded in this sealing groove during hot pressing. Within the annular sealing groove 212, an elastic sealing ring 6 is detachably provided. When the collar 42 of the pressure sleeve 4 is partially wrapped, its inner wall tightly presses the elastic sealing ring 6 against the bag body 1 within the annular sealing groove 212. This forms a multi-layered sealing defense: hot pressing provides the main seal, while the elastic sealing ring 6 deforms under the compression of the collar 42, not only further strengthening the seal but also generating an outward expansion force on the bag body 1 material, forming a mechanical locking effect that further resists peeling forces and ensures the integrity of the seal even under extreme conditions.

[0039] The working principle of Embodiment 2 of this application is as follows: When the cap 3 is tightened, its internal elastic element applies a continuous and stable clamping force to the heat-sealed area through the annular pressure plate 5. At the same time, the sealing ring 6 on the side wall expands radially under the pressure of the collar 42, forming a mechanical lock. This design can actively compensate for stress relaxation caused by external forces, significantly improving the sealing retention capability of the connection point under long-term use or transportation vibration, and providing a higher level of packaging safety for high-value or easily leaked contents.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flexible bag packaging, characterized in that: The bag includes a bag body (1) formed by wrapping a composite film into a cylindrical shape and hot-pressing the ends, a discharge nozzle (2), and a cap (3) installed on the discharge nozzle (2). The tail of the bag body (1) is provided with a tail sealing section (11) formed by heat sealing. The discharge nozzle (2) is hot-pressed and fixed to the top of the bag body (1). The cap (3) is set on the discharge nozzle (2) and is used to seal the discharge nozzle (2).

2. The flexible bag packaging according to claim 1, characterized in that: The composite membrane consists of an inner layer and an outer layer, with the inner layer having greater rigidity and barrier properties against oxygen and water vapor than the outer layer.

3. The flexible bag packaging according to claim 1, characterized in that: The discharge nozzle (2) is provided with a discharge channel (23). The cover (3) includes a connecting part (31) with internal threads and a cover plate (32). The connecting part (31) is threadedly connected to the discharge nozzle (2). The cover plate (32) is hinged to the connecting part (31) and used to seal the port of the discharge channel (23).

4. The flexible bag packaging according to claim 3, characterized in that: The inner side of the cover plate (32) is provided with an elastic sealing column (33). When the cover plate (32) is closed, the sealing column (33) extends into and tightly fits the inner wall of the discharge channel (23) to achieve a seal.

5. A flexible bag packaging according to claim 3, characterized in that: The discharge nozzle (2) includes a base (21) with an integrated sealing structure and a connector (22). The base (21) is heat-pressed to the bag body (1), and the connector (22) is threadedly sealed to the connecting part (31).

6. A flexible bag packaging according to claim 5, characterized in that: The connecting part (31) extends toward the base (21) to form a pressing sleeve (4). The pressing sleeve (4) includes a pressure ring (41) for pressing the top plane of the base (21) and a collar (42) for wrapping the outer wall of the base (21). The pressure ring (41) and the collar (42) are an integral structure.

7. A flexible bag packaging according to claim 6, characterized in that: The upper surface of the base (21) is provided with an annular groove (211), and the bag body (1) is hot-pressed and fixed in the annular groove (211).

8. A flexible bag packaging according to claim 7, characterized in that: An annular pressure plate (5) is slidably disposed in the annular groove (211) along the depth direction of the annular groove (211). The bottom circumferential array of the pressure ring (41) has multiple sets of elastic pressure blocks (411). When the pressure sleeve (4) is pressed, the multiple sets of elastic pressure blocks (411) undergo compression deformation and jointly push the annular pressure plate (5) to tightly press against the bag body (1) in the annular groove (211).

9. A flexible bag packaging according to claim 6, characterized in that: At least one annular sealing groove (212) is provided on the outer wall of the base (21). An elastic sealing ring (6) is detachably provided in the annular sealing groove (212). The bag body (1) is hot-pressed and embedded in the annular sealing groove (212). The inner wall of the collar (42) presses the elastic sealing ring (6) against the bag body (1) in the annular sealing groove (212).

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