A four-corner arc leak-proof heat-seal bag forming device

Abstract

The utility model discloses a four corners arc leak -proof heat -seal bag forming device relates to heat -seal bag forming technical field, including base, electrical control cabinet and bottom frame, the base bottom is equipped with recess, recess inside installation telescopic link, the telescopic link bottom installs brake universal wheel, the base is installed electrical control cabinet and bottom frame, install heating plate on bottom frame, the heating plate upper part is arc cutting knife, the arc cutting knife is the hydraulic cylinder. When the four corners of heat -seal bag are acute angle, the sealing line meets at sharp corner, when heat -seal pressure, cold shrink and transportation extrusion, easily form " stress point ". The utility model passes through the installation arc cutting knife, and its four corner parts adopt arc cutting and heat -seal integration configuration, make sealing corner no longer form sharp meeting point.

Description

Technical Field

[0001] This utility model relates to the field of heat-sealing bag forming technology, specifically a heat-sealing bag forming device with rounded corners for leak prevention. Background Technology

[0002] A heat-sealed bag is a packaging bag that is sealed by heating the opening or edges of the bag. It utilizes the property of plastic film to soften, melt, and recombine at a certain temperature, pressing two or more layers of material together to form a sealed container, achieving leak-proof, moisture-proof, and contamination-proof effects. An existing packaging bag forming device (publication number: CN222875481U) exhibits at least the following defects during use: 1. When the four corners of a heat-sealing bag are acute, the sealing lines intersect at sharp corners, easily forming "stress points" under heat sealing pressure, cold shrinkage, and transportation compression. The film at the sealing junction is prone to developing micro-cracks or incomplete sealing after heating and cooling, especially when containing liquids, greases, or high-temperature products, increasing the risk of leakage. Therefore, a heat-sealing bag forming device with rounded corners to prevent leakage is needed.

[0003] 2. When production layout changes, new processes are added, or capacity is expanded, stationary equipment needs to be disassembled and moved for relocation, increasing downtime and labor costs. Production lines for different bag types or products cannot be quickly repositioned, relying solely on material handling, which reduces production cycle time. In case of malfunctions, maintenance, or temporary order changes, rapid relocation to a backup area is impossible, delaying delivery. Therefore, a mobile heat-sealing bag forming device is needed. Utility Model Content

[0004] The main purpose of this utility model is to provide a heat-sealing bag forming device with rounded corners to prevent leakage, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A heat-sealing bag forming device with rounded corners for leak prevention includes a base, an electrical control cabinet, and a bottom frame. The bottom of the base has a groove, and a telescopic rod is installed inside the groove. A brake caster is installed at the bottom of the telescopic rod. The electrical control cabinet and the bottom frame are installed on the base. A heating plate is installed on the bottom frame. The upper part of the heating plate is a rounded cutting blade, and a hydraulic cylinder is mounted on the rounded cutting blade.

[0006] Preferably, the heating plate is equipped with a temperature sensor and a temperature control module, and the electrical control cabinet performs closed-loop regulation of the heating plate.

[0007] Preferably, the arc-shaped cutting blade adopts a detachable mounting structure.

[0008] Preferably, the base is equipped with a telescopic motor, and the electrical control cabinet controls the telescopic motor to control the telescopic rod.

[0009] Preferably, the brake caster is fully retracted into the groove when the telescopic rod is at its shortest length.

[0010] Preferably, the electrical control cabinet is connected to the hydraulic cylinder.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. By installing a circular arc cutting blade, which integrates circular arc cutting and heat sealing at the four corners, the sealing corners no longer form sharp intersection points. The circular arc transition can distribute the loads generated by heat sealing shrinkage, filling extrusion, and transportation vibrations to a larger path, significantly reducing the local stress peak at the corners and reducing the probability of microcracks and fusion interface tearing.

[0012] 2. By incorporating telescopic rods and braked casters, and driven by a telescopic motor, the machine possesses the mobility characteristics of being ready to use immediately upon pushing and stopping. When the production line needs to change workstations, add upstream or downstream processes, or conduct temporary trial production, the equipment does not require disassembly, reassembly, repositioning, or re-leveling; simply release the brakes and push it to the target position for immediate use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model from one perspective; Figure 2 This is a schematic diagram of structure A of the present invention; Figure 3 This is a schematic diagram of the overall structure of this utility model from two perspectives; Figure 4 This is a schematic diagram of structure B of the present invention; In the diagram: 1. Base; 2. Groove; 3. Telescopic rod; 4. Brake caster; 5. Electrical control cabinet; 6. Bottom frame; 7. Heating plate; 8. Arc cutting blade; 9. Hydraulic cylinder. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Example: Please refer to Figure 1-4 The present invention provides the following technical solution: A heat-sealing bag forming device with rounded corners for leak prevention includes a base 1, an electrical control cabinet 5, and a bottom frame 6. The bottom of the base 1 is provided with a groove 2, and a telescopic rod 3 is installed inside the groove 2. A brake caster 4 is installed at the bottom of the telescopic rod 3. The electrical control cabinet 5 and the bottom frame 6 are installed on the base 1. A heating plate 7 is installed on the bottom frame 6. A rounded cutting blade 8 is located on the upper part of the heating plate 7, and a hydraulic cylinder 9 is located on the rounded cutting blade 8.

[0018] Specifically: The heating plate 7 is equipped with a temperature sensor and a temperature control module, and the electrical control cabinet 5 performs closed-loop regulation of the heating plate 7.

[0019] Specifically: the arc cutting blade 8 adopts a detachable mounting structure.

[0020] Specifically: The base 1 is equipped with a telescopic motor, and the electrical control cabinet 5 controls the telescopic motor to control the telescopic rod 3.

[0021] Specifically: the brake caster 4 is fully retracted into the groove 2 when the telescopic rod 3 is at its shortest length.

[0022] Specifically: The electrical control cabinet 5 is connected to the hydraulic cylinder 9.

[0023] In this embodiment, the upper part of the heating plate 7 is a circular arc cutting blade 8, and the circular arc cutting blade 8 is equipped with a hydraulic cylinder 9. The circular arc cutting blade 8 adopts a detachable installation structure. To highlight the advantages of this device in sealing reliability compared to traditional right-angle sealing solutions, it adopts a configuration that integrates circular arc cutting and heat sealing at the four corners, so that the sealing corners no longer form sharp intersection points. The circular arc transition can disperse the load generated by heat sealing shrinkage, filling compression, and transportation vibration onto a larger path, significantly reducing the local stress peak at the corners and reducing the probability of microcracks and fusion interface tearing. For packaging scenarios containing liquids, oily substances, or those that have undergone high-temperature sterilization and freezing cycles, the rounded corners can also effectively suppress edge bursting and leakage caused by temperature differences and internal pressure fluctuations; under dynamic impacts such as drops and stacking, the circular arc seal has a higher burst resistance limit and fatigue life, thus maintaining more stable sealing performance throughout its entire life cycle.

[0024] This device employs a closed-loop regulation strategy using temperature sensors and a temperature control module for heat sealing quality control. Through real-time monitoring and precise compensation of the surface temperature field of the heating plate 7, it overcomes the problem of traditional open-loop heating being greatly affected by ambient temperature, film thickness, and operating cycle fluctuations. The temperature control system can correct thermal drift in a small and rapid manner, ensuring that the sealing area remains within the optimal melting-diffusion-crystallization range during each stage of mold closing, pressure holding, and mold opening. This avoids "false sealing" (insufficient fusion leading to easy tearing) and "oversealing" (overheating and carbonization causing strength reduction or brittleness). Combined with stable pressure and holding time control, the dispersion of sealing width, surface flatness, and fusion depth is significantly reduced, resulting in improved process yield and batch-to-batch consistency, providing a stable foundation for subsequent sampling inspection and process capability assessment.

[0025] In terms of adaptability and maintainability, the arc-shaped cutting blade 8 adopts a modular and detachable structure. The blade body and base are repositioned and precisely reset via quick release, positioning pins, or limit blocks, allowing for rapid switching between different bag types and corner radius requirements. This significantly shortens changeover time and reduces the workload of secondary calibration of the equipment baseline. Worn blades can be replaced independently or reground offline without disassembling the heating plate 7 and drive assembly, reducing downtime and spare parts costs. Furthermore, based on the thermal and mechanical properties of different film materials such as PE, PP, and PET / PE, maintenance personnel can select blade combinations with different edge shapes and coatings. This expands the equipment's process window for multiple materials, thicknesses, and operating conditions while ensuring clean cutting edges and corner heat-sealing strength. Overall, this maintainable and expandable blade system improves the overall uptime of the equipment and reduces the total life-cycle cost per unit output.

[0026] In this embodiment, the base 1 has a groove 2 at its bottom, a telescopic rod 3 is installed inside the groove 2, a brake caster 4 is installed at the bottom of the telescopic rod 3, a telescopic motor is installed inside the base 1, and the electrical control cabinet 5 controls the telescopic motor to control the telescopic rod 3. The brake caster 4 is fully retracted into the groove 2 when the telescopic rod 3 is at its shortest length.

[0027] This device features a telescopic rod 3 and braked swivel wheels 4 at the bottom, driven and controlled by a telescopic motor, giving the machine the mobility to be used immediately upon pushing and stopped. When the production line needs to change workstations, add upstream or downstream processes, or conduct temporary trial production, the equipment does not require disassembly, reassembly, repositioning, or re-leveling; simply release the brake and push it to the target position for immediate use. The telescopic mechanism can also perform minor height and level adjustments at the new workstation, ensuring accurate docking with adjacent fixtures, conveyor belts, or positioning fixtures. This significantly shortens the time window for line changes and machine readjustments, improves production line flexibility and order response speed, and adapts to flexible manufacturing scenarios with multiple varieties, small batches, and rapid iterations.

[0028] In terms of material and labor costs, mobile equipment can move closer to workstations according to the process rhythm, reducing the frequency and distance of secondary transfers of raw material rolls, semi-finished products, and finished products within the workshop, and reducing congestion and safety hazards caused by forklifts and handcarts. Shortening the material flow path not only reduces labor intensity and handling time losses, but also effectively reduces unplanned scrap such as edge damage, scratches, and creases on rolls, lowering the defect rate and rework rate, thus achieving better performance in terms of overall cost per unit output. For film materials sensitive to cleanliness and surface quality, reducing handling also helps reduce the risk of dust and contamination, maintaining consistency in sealing appearance and strength.

[0029] In terms of equipment maintenance and emergency response, the entire machine can be moved out of the main aisle or critical workstation in a short time, creating ample space for maintenance personnel to access the back and bottom, facilitating routine maintenance such as cleaning, inspection, and replacement of vulnerable parts, shortening the average repair time and reducing the impact on the entire production line. In the event of a sudden failure or temporary adjustment to order plans, the equipment can be quickly moved to a backup area or parallel production line, reducing the risk of main production line downtime and improving the flexibility of capacity scheduling. For scenarios requiring regular mold replacement, heat-sealing panel maintenance, or electrical component upgrades, mobility can also significantly shorten downtime windows and improve the overall equipment uptime.

[0030] In terms of space utilization and operational safety, the brake casters 4 can be fully retracted into the groove 2 of the base 1 during operation. The equipment's center of gravity and stress are directly borne by the feet / base 1, eliminating slight swaying and creeping caused by the casters and ensuring the stability of pressure and position during heat sealing and arc cutting. When not in operation, the equipment can be flexibly moved to an idle area or parked against a wall, freeing up operating and passage space near the workstation, optimizing aisle width and stacking order, and improving 5S / 6S management levels. At the same time, it reduces the space occupied by fixed foundations and anchor bolts, facilitating the dynamic adjustment of fire lanes and main material channels. The combination of retractable casters and brake locking design also reduces the risk of accidental displacement and tipping over, ensuring operational and maintenance safety.

[0031] In summary, the mobile heat-sealing bag forming unit, without altering the core heat-sealing and rounded corner cutting capabilities, significantly improves production line layout flexibility, material flow economy, maintenance convenience, and on-site space and operational safety through its structural mobility and lockable design. Compared to traditional fixed equipment, it effectively addresses pain points such as slow layout changes, high transportation costs, long downtime, and workstation congestion, better meeting the current manufacturing demands for rapid product switching and high-efficiency operation and maintenance.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heat-sealing bag forming device with rounded corners for leak prevention, comprising a base (1), an electrical control cabinet (5), and a bottom frame (6), characterized in that: The base (1) has a groove (2) at the bottom, a telescopic rod (3) is installed inside the groove (2), a brake caster (4) is installed at the bottom of the telescopic rod (3), an electrical control cabinet (5) and a bottom frame (6) are installed on the base (1), a heating plate (7) is installed on the bottom frame (6), an arc cutting blade (8) is on the upper part of the heating plate (7), and a hydraulic cylinder (9) is on the arc cutting blade (8).

2. The heat-sealing bag forming device with rounded corners for leak prevention according to claim 1, characterized in that: The heating plate (7) is equipped with a temperature sensor and a temperature control module, and the electrical control cabinet (5) performs closed-loop regulation of the heating plate (7).

3. The heat-sealing bag forming device with rounded corners for leak prevention according to claim 1, characterized in that: The arc cutting blade (8) adopts a detachable installation structure.

4. The heat-sealing bag forming device with rounded corners for leak prevention according to claim 1, characterized in that: The base (1) is equipped with a telescopic motor, and the electrical control cabinet (5) controls the telescopic motor to control the telescopic rod (3).

5. The heat-sealing bag forming device with rounded corners for leak prevention according to claim 1, characterized in that: The brake caster (4) is fully retracted into the groove (2) when the telescopic rod (3) is at its shortest.

6. The heat-sealing bag forming device with rounded corners for leak prevention according to claim 1, characterized in that: The electrical control cabinet (5) is connected to the hydraulic cylinder (9).

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