Side face middle sealing type bag body double-gluing device

Abstract

The utility model relates to the field of bag body processing equipment, and discloses a side face middle sealing type bag body double-gluing device which comprises a lifting mold, a sheet material bearing platform, an upper gluing device and a lower gluing device, and the lifting mold is connected with a mold power source for driving the lifting mold to lift and is used for pressing and forming sheet materials; the sheet material bearing platform is used for flatly laying sheet materials, and a forming channel allowing the lifting mold to stretch into the sheet material bearing platform from top to bottom is formed in the middle of the sheet material bearing platform; the upper gluing device can horizontally move left and right to and fro between a starting point A and an ending point B, the starting point A of the upper gluing device is located above the forming channel, and the ending point B is located above the sheet stock bearing platform; and when the upper gluing device is used for gluing the sheet material, the upper gluing device and the lifting mold always move relative to each other. According to the utility model, through the idle stroke of the upper gluing device relative to the gluing position, the stroke of unstable gluing amount of the upper gluing device in the starting or accelerating process is avoided, and the problem of non-uniform glue in the traditional process is solved.

Description

Technical Field

[0001] This utility model relates to the field of bag processing equipment, and in particular to a double-glue device for side-sealed bags. Background Technology

[0002] In modern life, packaging bags are often mass-produced using mechanical equipment. These bags include paper bags, non-woven fabric bags, or bags made of other materials. Existing packaging bag production equipment requires specialized forming molds to press down and form the sheet material. In the forming process of side-sealed bags, the bag body needs to be folded into a U-shape on both sides, requiring specialized molds that extend into the bag body. For example, Chinese utility model patent CN212353094U, entitled "An Adjustable Mold for Three-Dimensional Bag Forming and a Three-Dimensional Bag Forming Machine," discloses an adjustable mold for three-dimensional bag forming, including an inner mounting plate with side plates connected to both sides. The side plates can slide left and right relative to the inner mounting plate and are detachable and replaceable. For side-sealed bags, the specific process involves pre-applying adhesive to the overlapping edges of the sheet material, then pressing down the mold to fold the front and back sides of the bag body upwards relative to the mold. The side folding plates then fold the left and right sides towards the center, and the adhesive overlaps and bonds the bags together.

[0003] During the bag production process, the overlapping joints of the folded sheet materials need to be glued. Traditional glue application devices often use a single glue application method, such as the glue head moving laterally along a guide rail, or the glue head remaining stationary while the sheet material is pressed down by the mold to apply glue. However, both methods have difficulty controlling the glue output in the initial stage, and the initial movement is slow, leading to glue accumulation and uneven distribution, which can cause uneven glue application and glue overflow, affecting the bonding strength and aesthetics. In addition, existing technologies require the inner and outer glue application to be completed in separate steps, which is inefficient and makes it difficult to ensure precise alignment of the inner and outer glue layers. Therefore, there is an urgent need for a device that can simultaneously apply glue to both the inner and outer sides, distribute the glue evenly, and avoid accumulation. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a side-sealed bag double-gluing device.

[0005] To solve the above-mentioned technical problems, this utility model achieves its solution through the following technical solution:

[0006] A side-sealed bag double gluing device includes: a lifting mold, a sheet material carrying platform, an upper gluing device, and a lower gluing device. The lifting mold is connected to a mold power source that drives its lifting and lowering, and is used to press the sheet material down to form it.

[0007] The sheet material support platform is used to lay the sheet material flat. A forming channel is opened in the middle of the sheet material support platform for the lifting mold to extend from top to bottom. The upper glue applicator can move horizontally back and forth between the starting point A and the ending point B. The starting point A of the upper glue applicator is located above the forming channel, and the ending point B is located above the sheet material support platform. When the upper glue applicator applies glue to the sheet material, the upper glue applicator and the lifting mold always have relative movement. In the left and right direction, the front and rear lower glue applicators are set on the other side of the forming channel away from the upper glue applicator.

[0008] A forming channel is opened in the middle of the sheet material carrying platform for the lifting mold to extend into. Upper glue application devices are symmetrically arranged on the front and rear sides of the platform, and lower glue application devices are also symmetrically arranged. The glue head of the lower glue application device faces the forming channel and is lower than the surface of the platform. The upper glue application device can move horizontally back and forth above the forming channel.

[0009] When the upper glue applicator first starts, the glue volume is unstable. As the glue volume stabilizes, the slower the speed during acceleration, the more glue is applied, resulting in a larger glue volume at the beginning. Therefore, when the upper glue applicator does not have a blank stroke at the middle of the sheet material, it avoids this stroke where the glue volume is unstable. Since the starting point A of the upper glue applicator is located above the forming channel, the position corresponding to starting point A is the empty part at the bottom of the bag body relative to the side. When the upper glue applicator accelerates before applying glue to the top of the sheet material, it ensures that the glue on the top of the sheet material remains a stable straight line. The lower glue applicator applies glue to the sheet material that has already moved downwards under the action of the mold. Because there is a slight distance between the lower glue applicator and the sheet material support platform, there is a blank stroke for the mold to accelerate, thus ensuring stable glue application by the lower glue applicator.

[0010] Preferably, the front and rear sides of the sheet material carrying platform are symmetrically equipped with upper glue-applying devices, and the front and rear upper glue-applying devices are located on the left or right side of the forming channel. The front and rear sides of the sheet material carrying platform are symmetrically equipped with lower glue-applying devices.

[0011] One of the upper and lower glue application devices is a hot melt adhesive spraying device, and the other is a cold glue application device. The glue head of the lower glue application device faces the molding channel laterally inward, and the glue application height of the glue head is lower than the height of the upper surface of the sheet material support platform.

[0012] Preferably, the movement of the glue applicator from starting point A to ending point B consists of an initial acceleration section and a final deceleration section, with the acceleration and deceleration sections connected or linked by a constant-speed section in the middle. When the glue applicator is in the acceleration section, the lifting mold remains stationary or does not contact the sheet material; when the glue applicator is in the deceleration section, the lifting mold accelerates downwards. Hot melt adhesive is used for spraying from starting point A to ending point B above the sheet material platform, and the movement path is divided into acceleration, constant-speed, and deceleration sections. When the glue applicator is in the acceleration section, the lifting mold remains stationary; when it is in the deceleration section, the lifting mold accelerates downwards, maintaining a constant relative speed to ensure uniform glue application.

[0013] Preferably, when the glue applicator is in the constant speed and deceleration sections, the relative movement speed between the glue applicator and the lifting mold remains constant. Furthermore, after the glue applicator accelerates and is in the constant speed and deceleration sections, the relative movement speed between the glue applicator and the mold remains constant, so that when the glue output of the glue applicator is stable, the relative movement speed also remains constant, which can make the glue application more stable.

[0014] Preferably, the lifting mold has a mounting bracket on its side, on which a front-to-back extending crossbeam is fixedly mounted. A movable guide rail is adjustablely mounted below the crossbeam. The glue applicator is slidably mounted below the movable guide rail via a slider, which is connected to a lateral force source that drives its left-right movement. The movable guide rail of the glue applicator is adjustable to accommodate different bag sizes. The lifting mold is connected to a mold power source for pressing and forming the sheet material. Its side has a mounting bracket, on which the glue applicator is mounted via the crossbeam, movable guide rail, and slider.

[0015] Preferably, the folded portion of the sheet material is equipped with an upper pressure roller and a lower guide block, with an arc-shaped transition surface between the upper surface of the lower guide block and the side closest to the forming channel. The arc-shaped transition surface, including the upper pressure roller and lower guide block, guides the horizontal portion of the sheet material to form an arc-shaped connection with the vertical portion pressed down by the mold, preventing creases. The function of the upper pressure roller and lower guide block is to guide the sheet material along a specific trajectory into the forming channel, creating a limiting effect. There can be one or more upper pressure rollers.

[0016] Preferably, the folded portion of the sheet material at the junction of the sheet material carrying platform and the forming channel is equipped with an upper pressure roller and a lower guide roller. The lower guide roller is located outside the entrance of the forming channel. When the lifting mold descends, a vertical limit is formed between the lifting mold and the inner side of the lower guide roller, while the top of the lower guide roller and the bottom of the upper pressure roller form a horizontal limit on the sheet material. The lower guide roller has an arc-shaped guiding surface for the sheet material from horizontal to vertical. The vertical limit formed between the lower guide roller and the lifting mold prevents the sheet material from shifting and ensures accurate glue application. The arc-shaped guiding surface guides the horizontal portion of the sheet material to form an arc-shaped connection with the vertical portion pressed down by the mold, preventing creases. The function of the upper pressure roller and the lower guide roller is to guide the sheet material into the forming channel along a specific trajectory, forming a limit. There can be one or more upper pressure rollers.

[0017] Preferably, the upper gluing device, which applies glue to the same side of the sheet material, is located inside the lower gluing device. The corresponding parts of the upper and lower gluing devices should overlap and be bonded together. The fact that the upper gluing device is located inside the lower gluing device indicates that the side width of the upper gluing device is smaller than the side width of the lower gluing device. After gluing by the upper gluing device, the sheet material side overlaps the side of the lower gluing device, so that the overlap line is located in the middle of the bag body, almost coinciding with the center fold line of the bag body, which is beneficial to the aesthetics of the bag body.

[0018] This utility model, by adopting the above technical solution, has significant technical effects:

[0019] This invention combines hot melt adhesive and cold glue. The hot melt adhesive increases the cooling speed of the glue during initial bonding, thereby improving the efficiency of the glue application process. The cold glue enhances the bonding durability, solving the problem of using a single type of adhesive for two-sided bonding. The dynamic collaborative operation of the dual glue application devices solves the problem of low efficiency, making it suitable for mass production of high-quality bags.

[0020] By utilizing the idle stroke of the glue applicator relative to the glue applicator position, the unstable glue application during the initial start-up or acceleration of the glue applicator is avoided, thus solving the problem of uneven glue application in traditional processes. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of part C;

[0023] Figure 3 This is a schematic diagram of the structure during the process of the lifting mold pressing down the sheet material.

[0024] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Lifting mold; 11. Mold power source; 21. Upper pressure roller; 22. Lower guide block; 23. Lower guide roller; 3. Sheet material carrying platform; 4. Forming channel; 5. Upper glue applicator; 6. Sheet material; 7. Lower glue applicator; 71. Glue head; 8. Mounting bracket; 81. Crossbeam; 82. Moving guide rail; 83. Slider; 84. Lateral movement power source. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] A side-sealed double-glue device for bags, such as Figure 1-3 As shown, it includes: a lifting mold 1, a sheet material carrying platform 3, an upper glue applicator 5, and a lower glue applicator 7. The lifting mold 1 is connected to a mold power source 11 that drives it to lift and lower, and is used to press the sheet material 6 down to form it.

[0028] A sheet material support platform 3 is used to lay the sheet material 6 flat. A forming channel 4 is provided in the middle of the sheet material support platform 3 for the lifting mold 1 to extend from top to bottom. An upper glue applicator 5 can move horizontally back and forth between a starting point A and an ending point B. The starting point A of the upper glue applicator 5 is located above the forming channel 4, and the ending point B is located above the sheet material support platform 3. When the upper glue applicator 5 applies glue to the sheet material 6, the upper glue applicator 5 and the lifting mold 1 always have relative movement. In the left-right direction, a lower glue applicator 7 is located on the opposite side of the forming channel 4 away from the upper glue applicator 5. The mold power source 11 can be a cylinder, motor screw, motor synchronous pulley belt, or other conventional devices. Because the starting point A of the upper glue applicator 5 is located above the forming channel 4, the glue volume is unstable when the upper glue applicator 5 is first started. When the glue volume stabilizes, due to the acceleration process, the slower the speed, the more glue is applied, resulting in a larger glue volume in the initial stage. Therefore, when the upper glue applicator 5 has a blank stroke below the middle section of the sheet material, it avoids this stroke where the glue volume is unstable. Applying glue to the top of the sheet material 6 only after the upper glue applicator 5 has completed its accelerated movement ensures a stable glue output.

[0029] The front and rear sides of the sheet material carrying platform 3 are symmetrically provided with upper glue application devices 5, and the front and rear upper glue application devices 5 are located on the left or right side of the forming channel 4. The front and rear sides of the sheet material carrying platform 3 are symmetrically provided with lower glue application devices 7.

[0030] One of the upper glue applicator 5 and the lower glue applicator 7 is a hot melt adhesive spraying device, and the other is a cold glue applicator. In the figure, the upper glue applicator 5 is a hot melt adhesive spraying device, and the lower glue applicator 7 is a cold glue applicator. In fact, the positions can also be reversed. The glue head 71 of the lower glue applicator 7 is horizontally inward and directly facing the forming channel 4. The glue applicator height of the glue head 71 is lower than the height of the upper surface of the sheet material bearing platform 3.

[0031] The starting point A and ending point B of the upper glue applicator 5 are composed of an initial acceleration section and an end deceleration section. The acceleration section is connected to the deceleration section or is connected through the constant speed section in the middle section. When the upper glue applicator 5 is in the acceleration section, the lifting mold 1 remains stationary or does not contact the sheet material 6. When the upper glue applicator 5 is in the deceleration section, the lifting mold 1 performs an accelerated descent action.

[0032] When the glue applicator 5 is in the constant speed section and the deceleration section, the relative moving speed between the glue applicator 5 and the lifting mold 1 remains constant.

[0033] The lifting mold 1 has a mounting bracket 8 on its side, on which a front-to-back extending crossbeam 81 is fixedly mounted. A movable guide rail 82 is adjustablely mounted below the crossbeam 81. The upper glue applicator 5 is slidably positioned below the movable guide rail 82 via a slider 83. The slider 83 is connected to a lateral movement power source 84 that drives its left-right movement. The lateral movement power source 84 can be a cylinder, a motor screw, a motor belt, or other commonly used components in the art.

[0034] In one embodiment, an upper pressure roller 21 and a lower guide block 22 are provided at the folded portion of the sheet material at the junction of the sheet material carrying platform 3 and the forming channel 4. The upper surface of the lower guide block 22 has an arc-shaped transition surface between it and the side closest to the forming channel 4. In another embodiment, or in an embodiment where the limiting structures for applying glue to the upper and lower parts of the sheet material on the left and right sides are different, the folded portion of the sheet material is provided with an upper pressure roller 21 and a lower guide roller 23. The lower guide roller 23 is located outside the entrance of the forming channel 4. When the lifting mold 1 descends, a vertical limit is formed between the lifting mold 1 and the inner side of the lower guide roller 23 for the sheet material 6. The top of the lower guide roller 23 and the bottom of the upper pressure roller 21 form a horizontal limit for the sheet material 6. The lower guide roller 23 has an arc-shaped guiding surface for the sheet material 6 from horizontal to vertical.

[0035] The upper pressure roller 21 includes an upper pressure roller that flattens the front part of the bag corresponding to the sheet material, and an upper pressure roller that flattens the side part of the bag or the part where the front and side meet; the upper pressure roller 21 avoids the part of the sheet material 6 that needs to be glued.

[0036] Working principle: Combining Figure 1-3Sheet material 6 is conveyed or directly laid flat on sheet material carrying platform 3. The glue applicator 5 starts applying glue and accelerates from point A directly above the forming channel. Since there is no sheet material below at this time, the glue is applied from scratch. After acceleration, the glue applicator 5 moves at a constant speed and applies glue evenly to the overlapping areas of the sheet material, ensuring the glue is evenly distributed in a straight line. Then, the glue applicator 5 decelerates, while the lifting mold 1, driven by the mold power source 11, begins to descend, contacting the sheet material and accelerating its descent. To improve the glue application effect, the lifting mold 1 presses against the sheet material 6, accelerating simultaneously with the deceleration of the glue applicator 5, maintaining a constant relative speed. During the movement, the sheet material is pressed into the forming channel 4 by the lifting mold 1, forming a U-shaped, sealed bag prototype. Subsequently, the glue applicator 5 decelerates and moves to point B on the sheet material carrying platform 3.

[0037] The upper glue applicator 5 has several stages: Acceleration stage: When the lifting mold 1 is stationary or positioned above the sheet material before contact, the upper glue applicator 5 accelerates to a set speed; Constant speed stage: Both move at a constant relative speed, and hot melt adhesive is evenly sprayed onto the outer side of the sheet material; Deceleration stage: The lifting mold 1 accelerates and descends synchronously, maintaining relative speed to prevent glue accumulation. The glue nozzles 71 of the front and rear lower glue applicators 7 spray cold glue into the inner side of the forming channel 4, with the nozzle height below the platform surface to ensure the cold glue adheres only to the inner side of the sheet material. The sheet material changes from horizontal to vertical via the arc-shaped guide surface of the lower guide roller 23, and the upper pressure roller 21 flattens the front and sides of the bag, avoiding the glue applicator area and ensuring folding accuracy.

[0038] In the description of this utility model, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A side-sealed double-glue device for a bag, characterized in that, include: The lifting mold (1) is connected to a mold power source (11) that drives it to rise and fall, and is used to press the sheet material (6) down to form it; A sheet material carrying platform (3) is used to lay sheet material (6) flat. A forming channel (4) is provided in the middle of the sheet material carrying platform (3) for the lifting mold (1) to extend from top to bottom. The upper glue applicator (5) can move horizontally back and forth between the starting point A and the ending point B. The starting point A of the upper glue applicator (5) is located above the forming channel (4), and the ending point B is located above the sheet material carrying platform (3). When the upper glue applicator (5) applies glue to the sheet material (6), the upper glue applicator (5) and the lifting mold (1) always have relative movement. The sheet material carrying platform (3) is symmetrically provided with a lower glue applicator (7) on the front and back sides respectively. In the left and right direction, the front and back lower glue applicators (7) are located on the other side of the forming channel (4) away from the upper glue applicator (5).

2. The side-sealed double-glue device for a bag body according to claim 1, characterized in that: The sheet material carrying platform (3) is symmetrically provided with glue-applying devices (5) on the front and rear sides respectively, and the front and rear glue-applying devices (5) are located on the left or right side of the forming channel (4).

3. The side-sealed double-glue device for a bag body according to claim 2, characterized in that: One of the upper glue applicator (5) and the lower glue applicator (7) is a hot melt glue spraying device, and the other is a cold glue applicator. The glue head (71) of the lower glue applicator (7) is horizontally inward and directly facing the forming channel (4). The glue applicator height of the glue head (71) is lower than the height of the upper surface of the sheet material carrying platform (3).

4. The side-sealed double-glue device for a bag body according to claim 1, characterized in that: The starting point A and ending point B of the upper glue applicator (5) are composed of an initial acceleration section and an end deceleration section. The acceleration section and the deceleration section are connected or connected through a constant speed section in the middle section. When the upper glue applicator (5) is in the acceleration section, the lifting mold (1) remains stationary or does not contact the sheet material (6). When the upper glue applicator (5) is in the deceleration section, the lifting mold (1) performs an accelerated descent action.

5. A side-sealed double-glue device for a bag body according to claim 4, characterized in that: When the glue applicator (5) is in the constant speed section and the deceleration section, the relative moving speed between the glue applicator (5) and the lifting mold (1) remains constant.

6. A side-sealed double-glue device for a bag body according to any one of claims 1-5, characterized in that: The lifting mold (1) is provided with a mounting bracket (8) on its side. A crossbeam (81) extending forward and backward is fixedly installed on the mounting bracket (8). A movable guide rail (82) is adjustablely installed below the crossbeam (81). The glue applicator (5) is slidably installed below the movable guide rail (82) via a slider (83). The slider (83) is connected to a horizontal moving force source (84) that drives it to move left and right.

7. A side-sealed double-glue device for a bag body according to any one of claims 1-5, characterized in that: An upper pressure roller (21) and a lower guide block (22) are provided at the junction of the sheet material carrying platform (3) and the forming channel (4). The upper surface of the lower guide block (22) has an arc-shaped transition surface between it and the side of the forming channel (4).

8. A side-sealed double-glue device for a bag body according to any one of claims 1-5, characterized in that: An upper pressure roller (21) and a lower guide roller (23) are provided at the junction of the sheet material carrying platform (3) and the forming channel (4). The lower guide roller (23) is located outside the entrance of the forming channel (4). When the lifting mold (1) descends, the inner side of the lifting mold (1) and the lower guide roller (23) forms a vertical limit on the sheet material (6). The top of the lower guide roller (23) and the bottom of the upper pressure roller (21) form a horizontal limit on the sheet material (6). The lower guide roller (23) has an arc-shaped guiding surface for the sheet material (6) from horizontal to vertical.

9. A side-sealed double-glue device for a bag body according to claim 7, characterized in that: The upper pressure roller (21) includes an upper pressure roller that flattens the front part of the bag corresponding to the sheet material, and an upper pressure roller that flattens the side part of the bag or the connection part between the front and the side; the upper pressure roller (21) avoids the part of the sheet material (6) that needs to be glued.

10. A side-sealed double-glue device for a bag body according to any one of claims 1-5, characterized in that: The upper glue applicator (5) that applies glue to the same side of the sheet material (6) is located inside the lower glue applicator (7).

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