Bag making apparatus

Abstract

The utility model discloses a kind of bag making equipment, including sheet material feeding unit, pre-gluing unit and bag body making unit sequentially arranged along production direction;Sheet material feeding unit transports sheet material one by one along production direction, pre-gluing unit receives sheet material from sheet material feeding unit, gluing is carried out on the preset gluing site of sheet material;Bag making equipment is by setting independent pre-gluing unit, before sheet material enters bag body making process, preset gluing site on sheet material is uniformly completed gluing operation, not only production efficiency improvement space is larger, and each gluing site on every piece of sheet material can be made with higher positional accuracy, so that the consistency of finished bag gluing position can be improved.Meanwhile, special gluing station makes the applicable range of equipment to glue is wider, can be more convenient to adopt water-based adhesive and other better permeability glue, water-based adhesive can penetrate into sheet material substrate, adhering retention time is longer, and then the service life of bag can be improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag manufacturing technology, and in particular to a bag making equipment. Background Technology

[0002] In the production and manufacturing of packaging bags, adhesive application is a key process to ensure the bonding strength of various parts of the bag. Taking sheet-type packaging bags such as paper bags and non-woven bags as examples, adhesive is usually applied to multiple parts of the sheet material, such as the sealing edges, folding edges, and handle fixing points, and then the bag body is completed through processes such as forming, folding, and pressing.

[0003] In existing bag-making equipment, the glue application operation is usually integrated randomly into various workstations in the bag body manufacturing process. That is, glue is sprayed on the corresponding parts simultaneously or sequentially with processes such as forming, folding, and attaching handles. This method results in the glue spraying station and the bag body manufacturing station overlapping and interfering with each other, making it difficult to improve the production cycle and ensuring the accuracy of the glue application position for different batches of products, leading to poor glue application consistency.

[0004] Therefore, existing bag-making equipment suffers from problems such as poor adhesive coating consistency and low production efficiency. Utility Model Content

[0005] The purpose of this application is to solve the problems of poor glue coating consistency and low production efficiency in existing bag-making equipment.

[0006] To achieve the above objectives, this application provides a bag-making device, including a sheet material supply unit, a pre-coating unit, and a bag body making unit arranged sequentially along the production direction; wherein, the sheet material supply unit receives sheet material from a storage bin and conveys the sheet material one by one along the production direction; the pre-coating unit receives the sheet material from the sheet material supply unit and applies glue to the preset glue application areas on the sheet material; the bag body making unit receives the pre-coated sheet material and makes the bag body.

[0007] By adopting the above technical solution, the bag-making equipment, through the setting of an independent pre-coating unit, performs a uniform coating operation on the pre-designed coating areas on the sheet material before it enters the bag-making process. Since the pre-coating unit and the bag-making unit are independent of each other in the production direction, there is no process interference between the two stations, resulting in greater potential for improving production cycle time.

[0008] In addition, since the bag making equipment provided in this application applies adhesive to the sheet material uniformly at a dedicated pre-coating station, it can ensure higher positional accuracy of each adhesive application area on each sheet material, thereby improving the consistency of the adhesive application position of the finished bag.

[0009] In addition, the dedicated gluing station makes the equipment more applicable to a wider range of adhesives, making it easier to use water-based adhesives and other adhesives with better penetration. Water-based adhesives can penetrate into the interior of the sheet material substrate, resulting in longer adhesion and retention time, thereby significantly improving the service life of the bags.

[0010] According to the bag-making equipment provided in this application, the sheet material from the sheet material supply unit has multiple pre-coated areas, each pre-coated area being located at a different part of the same side surface of the sheet material; and the pre-coating unit applies adhesive to each pre-coated area simultaneously or sequentially.

[0011] By adopting the above technical solution, all pre-coated areas are concentrated on the same side surface of the sheet, which facilitates the pre-coating unit to complete the coating of multiple areas in one operation. It can coat all areas simultaneously or sequentially, offering high flexibility. Centralized and unified coating can further improve the positional accuracy and coating consistency between coating areas, reducing the risk of accumulated errors from multiple individual coatings.

[0012] According to the bag making equipment provided in this application, the bag making unit includes a forming section, which forms the sheet material into a bag body, and the pre-coated part includes an edge sealing adhesive part located on the main body part of the sheet material.

[0013] By adopting the above technical solution, by pre-applying adhesive to the sealing edge of the main body of the sheet material, the sealing edge can be stably bonded when the forming part folds the sheet material into a bag, avoiding the precision deviation caused by temporary glue application during the forming process, thereby improving the bonding strength and appearance of the bag sealing edge.

[0014] According to the bag-making equipment provided in this application, the bag body making unit includes a folding section, which folds the side fold of the sheet material and at least partially adheres the side fold to the main body of the sheet material, and the pre-adhesive section includes an edge adhesive portion located at the side fold of the sheet material; and / or, the bag body making unit further includes a handle fixing section, which fixes the end of the handle to a corresponding position on the side fold of the sheet material or the main body, and the pre-adhesive section further includes a handle adhesive portion located on the side fold of the sheet material and / or the main body.

[0015] By adopting the above technical solution, by pre-applying folding adhesive to the side folding part of the sheet material, no additional adhesive is needed when performing the folding action. After folding, the side folding part can be directly bonded to the main body, making the process simpler and the folding and bonding position more precise.

[0016] In addition, by pre-applying adhesive to the adhesive area of ​​the handle, the corresponding adhesive position is pre-applied when the handle end is fixed, making the handle installation position more precise and the fixing effect more stable, thereby improving the overall quality of the finished bag.

[0017] According to the bag making equipment provided in this application, the pre-coating unit includes a sheet support and a coating component; the sheet support has a support platform for supporting the sheet, the coating component is arranged opposite to the support platform in a direction perpendicular to the support platform, and the coating component has a coating part adapted to a preset coating area on the sheet, and each coating part can coat the corresponding preset coating area with glue.

[0018] Using the above technical solution, the sheet support unit can provide a flat and stable support platform, allowing the sheet to remain horizontally unfolded during adhesive application. The adhesive application component applies pressure to the sheet from the vertical direction of the support platform, with each application component corresponding to a pre-set application area. This allows for simultaneous application of adhesive to multiple areas in a single stroke, resulting in high application efficiency and uniform pressure across all application areas. The one-to-one correspondence between the application component and the pre-set application area effectively prevents adhesive overflow or omission, further improving application accuracy.

[0019] According to the bag-making equipment provided in this application, the gluing component is a gluing roller, and the gluing part is a flexible gluing structure that protrudes from the outer peripheral wall of the gluing roller and extends toward the support platform; wherein, the sheet material is laid flat on the support platform and can move along the conveying direction on the support platform, the gluing roller moves toward the sheet material, presses on the sheet material and rotates synchronously with the sheet material, and each flexible gluing structure sequentially covers the corresponding preset gluing area; or, the sheet material is laid flat on the support platform, the gluing roller moves toward the sheet material, presses on the sheet material and rotates relative to the support platform along the conveying direction, and each flexible gluing structure sequentially covers the corresponding preset gluing area.

[0020] Using the above technical solution, the gluing component is set as a gluing roller. The flexible gluing structure on the outer peripheral wall of the gluing roller contacts each preset gluing area on the sheet material sequentially as the roller rotates, completing the gluing process by roller coating. The flexible gluing structure can adaptively conform to the slight unevenness of the sheet material surface, resulting in good gluing uniformity and avoiding rigid pressure damage to the sheet material. In the working mode where the sheet material moves with the conveying direction and the gluing roller rotates synchronously, the sheet material can be continuously conveyed, achieving dynamic gluing; in the working mode where the sheet material is stationary and the gluing roller actively rolls, precise positioning gluing can be achieved on stationary sheet materials. Both methods can adapt to different production cycle requirements.

[0021] According to the bag making equipment provided in this application, the coating component is a coating plate, and the coating part is a flexible coating structure that is set on the side of the coating plate facing the support platform and extends towards the support platform; wherein, the sheet material is laid flat on the support platform, the coating component moves towards the sheet material, and each flexible coating structure simultaneously covers the corresponding preset coating area.

[0022] By adopting the above technical solution, the adhesive coating component is set as an adhesive coating plate. When the adhesive coating plate moves towards the sheet material, the flexible adhesive coating structures arranged on it can simultaneously cover the corresponding preset adhesive coating areas on the sheet material, achieving multi-point synchronous adhesive coating. The overall pressing method of the adhesive coating plate enables each adhesive coating area to complete adhesive coating at the same time and with consistent pressure. The relative positional accuracy between each adhesive coating area is higher, which is especially suitable for products with strict requirements for the positional consistency of multiple adhesive coating areas.

[0023] According to the bag-making equipment provided in this application, the flexible coating structure is configured as a coating cotton that can be detachably connected to the component body of the coating component.

[0024] By adopting the above technical solution, the flexible coating structure is set as a detachable coating cotton. On the one hand, the coating cotton material is soft and can adapt to the surface of the sheet material during coating, so that the coating is evenly applied. On the other hand, the coating cotton can be replaced separately. When the coating cotton is worn or has adhesive residue due to long-term use, only the coating cotton part needs to be replaced instead of the entire coating part. This can reduce maintenance costs and facilitate the selection of matching cotton material according to the characteristics of different types of adhesives.

[0025] According to the bag making equipment provided in this application, it also includes a coating conveyor belt extending along the production direction through the pre-coating unit, the side of the coating conveyor belt carrying the sheet material serving as a sheet material support part to support the sheet material; and the sheet material support part of the coating conveyor belt has an adsorption hole, which is connected to a negative pressure component.

[0026] The above technical solution utilizes the adhesive-coating conveyor belt as a sheet material support, allowing the sheet material to be continuously transported along the conveyor belt while being coated with adhesive, eliminating the need for a separate conveying mechanism and resulting in a compact structure. The suction holes on the adhesive-coating conveyor belt are connected to a negative pressure component, which uses negative pressure to firmly fix the sheet material to the conveyor belt surface, preventing displacement or warping of the sheet material during the pressure application process. This ensures the sheet material remains flat and stable during adhesive coating, further improving the accuracy of the adhesive coating position.

[0027] According to the bag making equipment provided in this application, at least one station of the bag making unit is further provided with an auxiliary glue applicator; the pre-coating unit applies water-based glue to the pre-coated area on the sheet material, and the auxiliary glue applicator applies hot melt glue or pressure-sensitive glue to the auxiliary glue area on the sheet material.

[0028] Using the above technical solution, the bag making equipment can achieve composite coating of water-based adhesive with hot melt adhesive or pressure-sensitive adhesive: the pre-coating unit pre-coats water-based adhesive at a dedicated station, which can penetrate into the interior of the sheet substrate and maintain adhesion for a longer time; the auxiliary glue application component in the bag making unit can supplement the coating of hot melt adhesive or pressure-sensitive adhesive at stations that require rapid curing or immediate bonding, which can meet the differentiated needs of different bonding parts in terms of adhesion strength, curing speed and service life, making the overall bonding performance of the finished bag more comprehensive. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the bag-making equipment provided in an embodiment of the present utility model;

[0030] Figure 2 A schematic diagram of the first structure of the bag making unit in the bag making equipment provided in this embodiment of the utility model;

[0031] Figure 3 This is a schematic diagram of a second structure of the bag making unit in the bag making equipment provided in this embodiment of the utility model;

[0032] Figure 4 A schematic diagram of a third structure of the bag making unit in the bag making equipment provided in this embodiment of the utility model;

[0033] Figure 5 This is a schematic diagram of the fourth structure of the bag making unit in the bag making equipment provided in this embodiment of the utility model;

[0034] Figure 6 A fifth structural schematic diagram of the bag making unit in the bag making equipment provided in this embodiment of the utility model;

[0035] Figure 7 A schematic diagram of the sixth structure of the bag making unit in the bag making equipment provided in this embodiment of the utility model;

[0036] Figure 8 This is a three-dimensional structural diagram of the pre-coating unit in the bag-making equipment provided in this embodiment of the utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Sheet material supply unit;

[0039] 20. Pre-coating unit; 210. Sheet support; 211. Coating conveyor belt; 2110. Adsorption hole; 220. Coating component;

[0040] 30. Bag body manufacturing unit; 310. Forming part; 320. Folding part; 330. Handle fixing part; 340. Auxiliary glue application part. Detailed Implementation

[0041] The purpose of this application is to provide a bag-making device with the advantages of good glue coating consistency and high production efficiency.

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the bag-making equipment provided in this application includes a sheet material supply unit 10, a pre-coating unit 20, and a bag body making unit 30 arranged sequentially along the production direction. The sheet material supply unit 10 is responsible for receiving the sheet materials stored in the storage bin and conveying the sheet materials one by one along the production direction. The pre-coating unit 20 receives the sheet materials from the sheet material supply unit 10 and applies glue to the preset glue-coating areas on the sheet materials. The bag body making unit 30 receives the sheet materials after pre-coating and performs bag body making, specifically performing bag body making processes such as forming and gluing, and finally produces finished bags.

[0044] The aforementioned units are functionally independent, with no process overlap between the pre-coating station and the bag manufacturing station, and the two do not interfere with each other, resulting in high overall machine operating efficiency. The pre-coating unit 20 separates the coating operation from the bag manufacturing process, forming a dedicated coating station. It is particularly advantageous for coating highly penetrating adhesives such as water-based adhesives, thereby significantly extending the service life of the finished bags.

[0045] The main function of the sheet material supply unit 10 is to separate the stacked or wound sheets in the storage bin one by one and reliably transport them to the pre-coating unit 20. The storage bin can be a flat stack bin or a vertical bin.

[0046] This application does not limit the specific structure and implementation of the sheet material supply unit 10. For example:

[0047] In one embodiment, the sheet material supply unit 10 can be an adsorption-type material picking mechanism with multiple vacuum suction cups. The suction cup array is arranged on a crossbeam, which is driven by a cylinder or servo module to rise and fall vertically. After picking up the top layer of sheet material, it is moved horizontally to the gluing station. The adsorption-type material picking leaves no clamping marks on the surface of the sheet material and is suitable for thin sheet materials such as paper or non-woven fabric.

[0048] In another embodiment, the sheet feeding unit 10 can be a friction feeding mechanism with an air-blowing separating device, where a precise gap is maintained between the bottom drive roller and the separating roller, and the sheet is fed out one sheet at a time from the bottom of the hopper. The air-blowing device blows air onto the side of the sheet when it leaves the hopper to prevent double sheets from being fed out.

[0049] In another embodiment, the sheet material supply unit 10 can be a stepping push mechanism using servo-driven chain transmission. The bottom plate of the hopper is supported by the stepping mechanism and gradually rises with the material picking action, keeping the top sheet material at a fixed height. The picking arm sends the top sheet material into the downstream conveying track by horizontal pushing.

[0050] Before the sheet material enters the bag manufacturing process, the pre-coating unit 20 uniformly applies adhesive to each pre-determined coating area on the sheet material. The pre-coating unit 20 is independent of the bag manufacturing unit 30 and has a dedicated coating station. During coating, the sheet material is conveyed to the coating station and positioned there. The coating component 220 transfers the adhesive from above or the side to each pre-determined coating area on the sheet material. After coating, the sheet material continues to be conveyed to the downstream bag manufacturing unit 30. The pre-coating unit 20 and the bag manufacturing unit 30 are spatially separate but sequentially connected in time, allowing the coating process to be unconstrained by the pace of the bag manufacturing process. The coating operation can be completed within a sufficient time, and the adhesive can obtain sufficient penetration and wetting time after coating, which is particularly beneficial for the full performance of penetrating adhesives on porous substrates such as water-based adhesives.

[0051] The pre-coating unit 20 may include a sheet positioning mechanism, a coating component 220 and its driving mechanism, a glue supply system, and a control system. The sheet positioning mechanism is used to position the sheet arriving at the coating station at the designated position of the coating station, ensuring that each preset coating part on the sheet is accurately aligned with each coating part of the coating component 220; the coating component 220 and the driving mechanism are responsible for carrying the glue and performing the coating action, uniformly transferring the glue to the surface of the sheet; the glue supply system continuously replenishes the glue to the coating component 220 to ensure the consistency of the coating amount; the control system coordinates the sheet positioning, the action of the coating component 220, and the coordinated operation of the glue supply system to realize the automation of the coating process.

[0052] This application does not limit the specific structure of the pre-applied adhesive unit 20. For example,

[0053] In one embodiment, the pre-coating unit 20 can be a fixed-station type coating device consisting of a fixed support table and a coating head assembly mounted on the upper gantry. The sheet material is fed to the fixed support table by the upstream conveyor belt. Positioning cylinders are provided on both sides of the table to push the sheet material to the reference position and fix it. The coating head assembly is driven to move down as a whole by the cylinders mounted on the gantry. Multiple coating cotton heads are installed on the coating head assembly according to the layout of each preset coating part. When moving down, each coating cotton head is pressed against the corresponding preset coating part on the sheet material to complete the coating.

[0054] In another embodiment, the pre-applying unit 20 may be a continuously operating applicator conveyor belt 211 (see [link to relevant documentation]). Figure 8A continuous coating device consisting of one or more sets of coating rollers installed above the conveyor belt. The coating conveyor belt 211 passes through the coating station along the production direction. After the sheet material moves to the coating station with the conveyor belt, the sheet material is fixed to the belt surface by the negative pressure adsorption mechanism set in the conveyor belt. The coating roller is pressed against the sheet material under the drive of the cylinder and rotates synchronously with the conveyor belt. The flexible coating structure on the outer peripheral wall of the coating roller evenly coats the adhesive on the surface of the sheet material during the rolling process. After the coating is completed, the coating roller is lifted and the sheet material continues to move downstream with the conveyor belt.

[0055] In another embodiment, the pre-coating unit 20 can be a rotary coating device consisting of a rotary worktable and a coating unit. Multiple sheet clamping stations are evenly distributed on the rotary worktable. The worktable rotates one station angle at a time. After the sheet is placed on the clamping seat at the loading station, it passes through the coating station, where a coating component 220 is provided (see [reference]). Figure 8 The glue application component 220 is equipped with a corresponding glue application head according to the layout of each preset glue application area. When the worktable stops rotating, the glue application component 220 moves down to apply glue to the sheet material.

[0056] The bag making unit 30 receives the sheet material processed by the pre-coating unit 20 and performs processes such as handle installation, forming, and folding on the sheet material to process the flat sheet material into finished bag bodies. Since the sheet material has already undergone the glue application process before entering the bag making unit 30, there is no need to set up glue application devices at each station of the bag making unit 30. The structural design of each station can focus more on forming and assembly functions, and the possibility of glue overflow or uneven glue application affecting the forming quality is smaller. The bag making unit 30 typically includes, along the production direction, a handle installation station, a folding station, a forming station, and a finished product output station, etc., and the stations are connected by conveyor belts or conveying mechanisms.

[0057] Furthermore, the specific structure of the bag manufacturing unit 30 depends on the type of the target bag and the forming process. For bags that require three-dimensional forming, such as square-bottom bags and stand-up pouches, the bag manufacturing unit 30 needs to be equipped with corresponding bottom folding and side folding mechanisms. The workstations of the bag manufacturing unit 30 can be arranged in a straight line or around a turntable; the layout can be determined according to the production site and product type.

[0058] This application does not limit the specific structure of the bag manufacturing unit 30. For example,

[0059] In one implementation, see Figure 4The bag making unit 30 can be a linear bag making device consisting of a straight-line folding section 320, a forming section 310, and a finished product output section. The stations are connected by a synchronous belt conveyor. After the sheet material is output from the pre-coating unit 20, it passes through each station in a straight line. The folding section 320 folds and glues the side folds using a folding knife and a pressing roller. The forming section 310 folds and presses the sheet material using upper and lower templates. The finished product output section outputs the completed bag body via a belt conveyor.

[0060] In another embodiment, the bag making unit 30 can be a rotary bag making device composed of a turntable multi-station forming device. The turntable is provided with multiple sheet clamping stations. Each time the turntable rotates, it transfers the sheet from one station to the next, and sequentially completes the processes of handle installation, edge folding, forming and finished product removal. The actuators of each station are fixed around the turntable and do not move. During the time the turntable stops, each mechanism performs processing actions.

[0061] In another embodiment, the bag making unit 30 can also be a flexible bag making system consisting of a robot gripping unit and multiple independent processing stations. After the sheet material is output from the pre-coating unit 20, it is transported to the transfer station. The multi-axis industrial robot grips the sheet material one by one from the transfer station and transfers the sheet material to the handle installation processing station, the edge folding processing station and the forming processing station in sequence according to the preset program. Each processing station is driven by an independent servo mechanism. The robot's motion trajectory and the process parameters of each processing station are uniformly coordinated and controlled by the CNC system. The flexible bag making system can quickly adapt to the switching of bag products of different sizes and shapes, and is suitable for customized production needs of multiple varieties and small batches.

[0062] The bag-making equipment provided in this application applies adhesive to the sheet material uniformly at a dedicated pre-coating station, ensuring higher positional accuracy of the adhesive application areas on each sheet material, thereby improving the consistency of the adhesive application in the finished bags. Furthermore, the dedicated adhesive station broadens the equipment's applicability to various adhesives, making it easier to use water-based adhesives with better penetration. Water-based adhesives can penetrate deep into the sheet material substrate, resulting in longer adhesion and significantly extending the bag's lifespan.

[0063] Based on the bag-making equipment with the above-described structure provided in this application, the sheet material from the sheet material supply unit 10 has multiple pre-coated areas, each pre-coated area being located at a different part of the same side surface of the sheet material; and the pre-coating unit 20 applies adhesive to each pre-coated area simultaneously or sequentially.

[0064] Specifically, having multiple pre-coated areas on the same side of the sheet material means that the coating component 220 can apply adhesive to all pre-designed coating areas from the same side of the sheet material without flipping the sheet material or setting coating mechanisms on both sides of the sheet material separately. Synchronous coating can be understood as the coating component 220 of the pre-coating unit 20 simultaneously covering all pre-designed coating areas in one operation, which is suitable for scenarios where the coating areas are concentrated and the coating component 220 can cover them in one operation; sequential coating refers to the coating component 220 covering each pre-designed coating area step by step through displacement or rotation, which is suitable for scenarios where the coating areas are scattered or cannot be covered simultaneously in a single operation.

[0065] It should be understood that this application does not limit the specific number of pre-applied adhesive areas; for example, it can be any number such as 2, 3, or 4.

[0066] This application does not limit the specific method of applying adhesive to the adhesive-coated component 220. For example,

[0067] In one embodiment, a fixed adhesive applicator can be provided, which has multiple adhesive applicators arranged in a one-to-one correspondence with each pre-applied adhesive area. The spacing between each adhesive applicator is exactly the same as the spacing between each pre-applied adhesive area on the sheet. The adhesive applicator completes the synchronous adhesive application of all parts by performing a pressing action towards the sheet once.

[0068] In another embodiment, a roller-applied adhesive structure can be provided (see...). Figure 8 The adhesive coating structure rolls the sheet material to apply adhesive to each pre-coated area in sequence.

[0069] In another embodiment, multiple glue-coating stations can be arranged in series along the production direction. The sheet material passes through each glue-coating station in sequence under the drive of the conveyor belt. Each glue-coating station is responsible for applying glue to a preset glue-coating part of the sheet material. The position of the glue-coating head and the triggering sequence of each glue-coating station can be adjusted independently to realize the sequential application of glue to multiple parts of the sheet material during continuous transmission.

[0070] Based on the bag manufacturing unit 30 with the above structure, in this application, as... Figure 3 As shown, the bag manufacturing unit 30 includes a molding section 310, which shapes the pre-coated sheet into a bag body; the pre-coated part includes the edge sealing adhesive part located at the sealing edge of the main body of the sheet.

[0071] Specifically, the edge-sealing adhesive area refers to the area on both sides or the bottom edge of the main body of the sheet material that needs to be folded and glued to form a closed bag. After the adhesive is pre-applied to the edge-sealing adhesive area at the pre-applied adhesive station, the sheet material is conveyed to the forming section 310. When the forming section 310 folds and presses the sheet material, the adhesive in the edge-sealing adhesive area is directly bonded under the forming pressure, completing the edge-sealing operation. Since the edge-sealing area is pre-prepared with adhesive, there is no need to apply adhesive simultaneously in the forming process. The mechanical design of the forming section 310 is simplified, and the forming and pressing action is cleaner and more efficient. There is no risk of adhesive overflow and contamination of other parts when applying adhesive on the spot, resulting in a cleaner edge-sealing appearance.

[0072] This application does not limit the specific structure of the forming part 310. For example, in one embodiment, the forming part 310 can be an upper and lower pressing forming mechanism composed of an upper template and a lower template. The lower surface of the upper template is provided with a folding blade corresponding to the folding line of the bag body, and the upper surface of the lower template is provided with a folding groove that cooperates with the folding blade. When the upper template moves downward under the drive of a cylinder or hydraulic cylinder, it presses the sheet material into the folding groove to form a fold. Then, the sealing adhesive part is heat-pressed and cured by a heated pressure plate.

[0073] In another embodiment, the forming part 310 may also include a mold and a forming guide device with a folding guide groove. The cross-sectional shape of the guide groove matches the folding shape of the target bag. When the sheet passes through the guide groove under the drive of the mold, the side wall and bottom wall of the guide groove continuously apply folding guiding force to the corresponding part of the sheet, so that the sheet gradually bends and wraps around the outside of the mold. A pressing roller is provided at the end of the guide groove to roll and cure the sealing adhesive part.

[0074] In another embodiment, the forming section 310 can also be a progressive roll forming mechanism consisting of multiple pressure rollers arranged in sequence according to the folding order. The spacing and angle of each pair of pressure rollers gradually decrease according to the folding order. The sheet material is folded sequentially as it passes through each pair of pressure rollers, and finally the edge sealing is completed under the action of the end pressure roller. Progressive roll forming can avoid damage to the sheet material caused by a large-angle fold at one time, and is particularly suitable for thick cardboard or rigid substrate sheet material.

[0075] Based on the bag manufacturing unit 30 with the forming part 310 described above, in this application, as Figures 4 to 7 As shown, the bag body manufacturing unit 30 also includes a folded edge portion 320, which folds the side fold portion of the sheet material and at least partially adheres the side fold portion to the main body portion of the sheet material. The pre-coated portion includes the folded edge adhesive portion located at the side fold portion of the sheet material.

[0076] Based on the bag manufacturing unit 30 with the forming part 310 described above, such as Figures 4 to 7As shown in this application, the bag manufacturing unit 30 may also include a handle fixing part 330, which fixes the end of the handle to the corresponding position of the side folding part of the sheet material or the main body part. The pre-coated part also includes a handle adhesive part located at the side folding part of the sheet material and / or the main body part.

[0077] Those skilled in the art will understand that the bag manufacturing unit 30 may consist only of the forming part 310 (see [link]). Figure 2 It can also include a forming part 310 and a folded edge part 320 (see...). Figure 3 It can also include a molding part 310 and a handle fixing part 330 (see...) Figure 4 Of course, it can also include the forming part 310, the folded edge part 320 and the handle fixing part 330 at the same time (see Figures 5 to 7 ).

[0078] Furthermore, it should be noted that this application does not require a specific positional relationship between the forming part 310, the folding part 320, and the handle fixing part 330. For example, the handle fixing part 330 and the folding part 320 can both be located upstream of the forming part 310 (arranged along the production direction in the order of folding part 320, handle fixing part 330, and forming part 310, or as...). Figure 5 As shown, the handle fixing part 330, the folded edge part 320, and the forming part 310 are arranged in that order. Alternatively, the handle fixing part 330 and the folded edge part 320 may be located upstream and downstream of the forming part 310, respectively (e.g., as shown). Figure 7 As shown, the handle fixing part 330 is disposed on the upstream side of the forming part 310, and the folded edge part 320 is disposed on the downstream side of the forming part 310; or the folded edge part 320 is disposed on the upstream side of the forming part 310, and the handle fixing part 330 is disposed on the downstream side of the forming part 310; or both the handle fixing part 330 and the folded edge part 320 are located on the downstream side of the forming part 310 (e.g., Figure 6 As shown, the parts are arranged in the following order along the production direction: forming part 310, folding part 320, and handle fixing part 330, or in the following order: forming part 310, handle fixing part 330, and folding part 320.

[0079] The detailed structure of the bag manufacturing unit 30 is described in further detail below.

[0080] The folded edge 320 is formed by folding over and bonding the side folded portion (i.e., the folded edges reserved on both sides of the sheet material) to the main body to form the side structure of the bag or to provide a thickened and reinforced structure for the handle mounting area. Adhesive has been pre-applied to the folded edge at the pre-applied adhesive station. When the folded edge 320 performs the folding action, it only needs to be folded over the main body and pressed together. The adhesive at the folded edge bonding area directly bonds to the surface of the main body, completing the folding fixation. No additional adhesive application device is required at the folding station.

[0081] If the handle fixing part 330 is located upstream of the folding part 320, the handle end is positioned and installed before folding. The handle adhesive area has been pre-applied at the pre-adhesive station. The handle fixing part 330 places the handle end on the adhesive area, and the adhesive pre-bonds the handle end, temporarily fixing it to the sheet material. Then, when the folding part 320 performs the folding action, the side fold folds over and covers the handle end, clamping and securing it, further improving the connection strength between the handle and the bag body. This dual fixing method of pre-applied adhesive and folding clamping ensures a secure and reliable handle installation, effectively preventing the handle from detaching from the bag body during use.

[0082] This application does not limit the specific structure and connection method of the folded edge portion 320 and the handle fixing portion 330. For example,

[0083] In one embodiment, the folding part 320 can be a folding mechanism with a folding knife and a pressing roller. The blade of the folding knife is an arc-shaped guide blade. The side folding part is guided by the folding knife and gradually bends towards the main body part during the movement of the sheet material. Then, the pressing roller applies pressure to the folded side folding part from above, so that the folded adhesive part is fully bonded to the main body part. The installation position of the folding knife can be adjusted according to the side folding width.

[0084] In another embodiment, the folded edge portion 320 can be a folding and pressing mechanism composed of an upper pressure plate and a lower support plate. A clamping gap matching the thickness of the side folded portion is formed between the upper pressure plate and the lower support plate. After the side folded portion of the sheet material is clamped and guided to fold, the upper pressure plate and the lower support plate move synchronously toward the main body portion and apply pressure to complete the bonding. Both the upper pressure plate and the lower support plate can be driven by a cylinder.

[0085] In another embodiment, the folded edge portion 320 may be a folding clamping mechanism with a folding edge clamping arm. The folding edge arm is driven by a rotary cylinder or a motor. The end of the folding edge arm is provided with a clamping claw. After the clamping claw clamps the side folded portion, it rotates with the folding edge arm to flip the side folded portion to the top of the main body portion. Then, the pressure plate presses down to complete the pressing.

[0086] The specific structure and connection method of the knot in the handle fixing part 330 are not limited. For example,

[0087] In one embodiment, the handle fixing part 330 can be a handle installation device having a handle picking mechanism and a positioning pressing mechanism. The handle picking mechanism takes out the formed rope handles or paper handles one by one from the handle material tray and moves the handle end to the handle adhesive part of the corresponding sheet material. The positioning pressing mechanism presses the handle end down into the handle adhesive part so that the adhesive initially fixes the handle end.

[0088] In another embodiment, the handle fixing part 330 can be a handle installation mechanism with perforation and hot pressing functions. First, perforation is made at the corresponding position of the sheet material, and then the two ends of the pre-formed ring handle are passed through the holes and folded on the back of the sheet material. The hot pressing device heat-presses the folded part of the handle end to the handle adhesive part on the back of the sheet material.

[0089] In another embodiment, the handle fixing part 330 can be a clamping and pressing device for fixing a flat handle. After the two ends of the flat handle are positioned by the positioning clamps, they are placed on the handle adhesive part of the sheet material. The pressing device applies downward pressure to press the handle end onto the handle adhesive part.

[0090] Those skilled in the art should understand that the specific location of the adhesive part of the handle is not limited; it can be the side fold or the main body, and the specific location should be set according to actual production needs.

[0091] In this application, a bag-making device based on the above structure is used, as follows: Figure 8 As shown, the pre-coating unit 20 includes a sheet support portion 210 and a coating component 220. The sheet support portion 210 has a support platform, and the coating component 220 is arranged opposite to the support platform in a direction perpendicular to the support platform. The coating component 220 is provided with coating portions that are adapted to each preset coating portion of the sheet, and each coating portion can apply adhesive to the corresponding preset coating portion.

[0092] Specifically, the sheet support 210 provides a flat and stable support base for the sheet during the adhesive application process, keeping the sheet in a horizontally unfolded state and preventing the sheet from bending, shifting or deforming under the pressing force of the adhesive application component 220, thereby ensuring the accuracy of the adhesive application position and the uniformity of the adhesive application pressure.

[0093] The adhesive application component 220 carries the adhesive medium (such as liquid adhesive) and, under appropriate pressure, transfers and applies the adhesive to the preset adhesive application areas on the sheet material. The shape, area, and arrangement of each adhesive application part on the adhesive application component 220 correspond one-to-one with the preset adhesive application areas on the sheet material, ensuring that each adhesive application precisely covers only the area requiring adhesive application. The adhesive application component 220 can reciprocate in a direction perpendicular to the support platform; the movement towards the sheet material is the adhesive application stroke, and the movement away from the sheet material is the reset stroke.

[0094] This application does not limit the specific structure of the sheet support 210 and the adhesive coating component 220. For example,

[0095] In one embodiment, the sheet support 210 can be a flat aluminum alloy support platform fixed on the frame beam. The platform surface can be anodized to reduce the coefficient of friction and prevent adhesive adhesion. The adhesive application component 220 can be an adhesive application plate assembly installed at the end of the cylinder piston rod. The cylinder is fixed above the frame, the piston rod is vertically downward, and the adhesive application plate assembly moves downward as the cylinder extends to press against the sheet to complete the adhesive application.

[0096] In another embodiment, the sheet support 210 can also be a horizontal guide rail mounted on the frame. The sheet is pushed along the guide rail to the glue application station and stops. The side of the guide rail is provided with a positioning block to position the sheet on the guide rail. The glue application component 220 can be a lifting multi-head glue application device driven by a servo electric cylinder. The servo electric cylinder can accurately control the glue application stroke and pressure.

[0097] In another embodiment, the sheet support 210 can be a vacuum adsorption table set on the frame. The table has an air channel connected to a vacuum pump inside, and suction holes are distributed on the upper surface of the table. After the sheet arrives at the gluing station, the vacuum pump starts to firmly adsorb and fix the sheet on the table. The gluing component 220 can be a multi-head gluing device installed on the frame.

[0098] In this application, the adhesive coating component 220 based on the above structure is an adhesive coating roller, and the adhesive coating part is a flexible adhesive coating structure that protrudes from the outer peripheral wall of the adhesive coating roller and extends toward the support platform.

[0099] In the specific implementation of adhesive application, the sheet material can be laid flat on the support platform and can move along the conveying direction on the support platform. The adhesive roller moves toward the sheet material, presses onto the sheet material, and rotates synchronously with the sheet material. Each flexible adhesive application structure sequentially covers the corresponding preset adhesive application area.

[0100] Alternatively, the sheet material can be laid flat on a support platform, and the glue roller moves toward the sheet material, presses onto the sheet material, and rotates relative to the support platform along the transmission direction, with each flexible glue coating structure sequentially covering the corresponding preset glue coating area.

[0101] Specifically, the coating roller is a roller-shaped body that can rotate around its axis. The flexible coating structure on the outer peripheral wall of the roller contacts the surface of the sheet material sequentially as the roller rotates, uniformly coating the adhesive onto the preset coating areas through a rolling motion. The rolling coating method acts on the sheet material through rolling friction. Compared with simple planar pressing coating, rolling can generate an auxiliary thrust that helps the adhesive penetrate into the fiber gaps of the sheet material substrate. This is beneficial for water-based adhesives and other penetrating adhesives to more fully wet the substrate, thereby improving the bonding strength of the bag. The flexible coating structure can adapt to the slight undulations of the sheet material surface, ensuring that each coating area receives uniform coating pressure, resulting in a more uniform coating thickness.

[0102] During use, the coating roller needs to be replenished with adhesive through a glue supply device. This device can be a drip tube located above the coating roller, where the adhesive flows out from the drip tube under gravity and drips onto the flexible coating structure on the roller surface; or it can be an internal glue supply chamber located inside the coating roller, where the adhesive is injected from the end face of the roller through an internal air passage and then permeates into the flexible coating structure; or it can be a glue immersion tank located on one side of the coating roller, where the coating roller is partially immersed in the immersion tank and rotates while the flexible coating structure absorbs the adhesive from the tank, and then rotates to the top of the sheet to complete the coating process.

[0103] This application does not limit the specific structure of the coating roller. For example,

[0104] In one embodiment, the coating roller can be a foamed rubber coating roller with a full section of foamed rubber roller sleeve on the roller shaft. The outer peripheral wall of the foamed rubber roller sleeve is engraved according to the position and shape of each preset coating part. The protruding part constitutes a flexible coating structure, and the recessed part does not participate in the coating.

[0105] In another embodiment, the coating roller can be a segmented coating roller in which multiple independent coating cotton blocks are evenly arranged circumferentially on the mandrel. The arc length of each coating cotton block matches the coverage arc length of the corresponding preset coating part in the direction of roller rotation. Each coating cotton block can be removed and replaced individually from the mandrel, making maintenance flexible. Each coating cotton block is fixed in the mounting groove at the corresponding position of the mandrel by a fixing clamp or screw.

[0106] In another embodiment, the coating roller can be a combined coating roller composed of multiple independently adjustable segmented rollers. Each segmented roller is raised and lowered by an independent cylinder to control its contact and disengagement from the sheet material. The axes of each segmented roller are the same. Each segmented roller can be independently set to work state according to the distribution of each preset coating part on the sheet material. The segmented rollers that do not need to be coated remain raised and do not contact the sheet material, while the segmented rollers that need to be coated are pressed down to contact the sheet material, thereby achieving selective coating of multiple discontinuous coating parts within the stroke of one roller.

[0107] Unlike the adhesive coating component 220 described above, in this application, the adhesive coating component 220 can also be an adhesive coating plate (not shown), and the adhesive coating part is a flexible adhesive coating structure that is disposed on the side of the adhesive coating plate facing the support platform and extends toward the support platform; wherein, the sheet material is laid flat on the support platform, the adhesive coating component 220 moves toward the sheet material, and each flexible adhesive coating structure simultaneously covers the corresponding preset adhesive coating area.

[0108] Specifically, the coating plate is designed as a flat carrier with the coating component 220. On the side facing the sheet material, flexible coating structures are arranged according to the positions and shapes of the preset coating areas. The coating plate moves up and down as a whole. When it moves downward, each flexible coating structure simultaneously contacts the sheet material, applying coating to all preset coating areas at the same time. The relative positions between each coating area are completely determined by the fixed positions of each flexible coating structure on the coating plate, thus achieving higher relative positional accuracy.

[0109] The driving mechanism of the adhesive coating plate can be a linear drive device such as a pneumatic cylinder, hydraulic cylinder, or servo electric cylinder; specifically, a servo electric cylinder with force sensor feedback can be selected to adjust the adhesive coating pressure to the set value in real time according to the force sensor signal.

[0110] This application does not limit the specific structure or driving method of the adhesive-coated plate. For example,

[0111] In one embodiment, the adhesive coating plate can be a rectangular aluminum alloy plate, on which adhesive cotton blocks of corresponding shapes are adhered according to the position and shape of the preset adhesive coating area. The adhesive cotton blocks are fixed in the mounting groove of the corresponding position of the aluminum alloy plate by double-sided tape or clips. The entire adhesive coating plate is driven symmetrically from both ends of the plate by upper and lower double cylinders. The downward movement of the entire adhesive coating plate completes the synchronous adhesive coating of the preset adhesive coating area within the coverage area of ​​all adhesive cotton blocks in one go.

[0112] In another embodiment, the coating plate can be an integrated irregular-shaped aluminum die-cast plate with multiple coating bosses. The shape and position of each boss are reserved during casting according to the layout of the preset coating area. The surface of the boss is covered with a sponge coating layer. The upper part of the plate is provided with two threaded connection points to connect to the output end of the servo electric cylinder.

[0113] In another embodiment, the coating plate can also be a modular splicing plate assembled from multiple individual coating modules. Each coating module corresponds to a preset coating area. Each module can be installed on the base plate via a T-slot track. The position of the module along the track direction can be manually adjusted by loosening the locking screws.

[0114] The adhesive-coated component 220 based on the above structure, such as Figure 8 As shown, the flexible adhesive coating structure in the adhesive coating component 220 is configured as an adhesive coating cotton that can be detachably connected to the component body of the adhesive coating component 220.

[0115] Specifically, coated cotton is a flexible absorbent material with an open-pore, porous structure that can store and uniformly release adhesive to the contact surface through capillary action. Examples include polyurethane foam, polyvinyl alcohol foam, and non-woven fiber cotton. Different materials vary in porosity, adhesive absorption capacity, adhesive release rate, and resistance to adhesive corrosion. The appropriate coated cotton material can be selected based on the characteristics of the adhesive used. During operation, the coated cotton absorbs and replenishes adhesive through communication with the adhesive storage chamber, or it can be replenished via structures such as a coating roller.

[0116] In this application, when the coated cotton becomes clogged, its adhesive absorption capacity decreases, or its surface wears down due to long-term use, the operator can quickly remove the used coated cotton, install new coated cotton, and continue production. Alternatively, when the bag-making equipment needs to be reconfigured, the original coated cotton can be removed and reinstalled in the new position.

[0117] This application does not limit the specific method of detachable connection of the coated cotton. For example,

[0118] In one embodiment, the adhesive cotton can be fixed to the component body by hook and loop fasteners (i.e., Velcro, which is a reusable fastener consisting of a hook side and a loop side). The hook side of the Velcro is attached to the surface of the component body, and the loop side of the Velcro is attached to the back of the adhesive cotton. During installation, the back of the adhesive cotton is pressed against the surface of the component body to bond and fix it. When replacing, the old adhesive cotton can be removed by simply tearing it open. The replacement operation is simple and quick, requiring no tools, and the Velcro can maintain reliable adhesive strength even after multiple disassemblies and reassemblies.

[0119] In another embodiment, the adhesive cotton can be embedded in a pre-set rectangular positioning groove on the component body. The outer dimensions of the adhesive cotton are closely matched with the inner wall dimensions of the groove to achieve positioning. A pressure strip is provided at the opening of the groove, and the two ends of the pressure strip are locked to the edge of the groove by spring buckles. When installing the adhesive cotton, first embed the adhesive cotton into the groove, and then press the pressure strip to the buckle locking position to fix it. When disassembling, press the buckle to unlock and remove the pressure strip, and the adhesive cotton can be taken out from the groove. The positioning fit of the groove can ensure the consistency of the position of the adhesive cotton after each installation.

[0120] Based on the bag-making equipment with the structure described above in this application, in this application, as follows: Figure 8 As shown, it also includes a coating conveyor belt 211 extending through the pre-coating unit 20 along the production direction. The side of the coating conveyor belt 211 that carries the sheet material serves as a sheet material support portion 210 to support the sheet material. Furthermore, the sheet material support portion 210 of the coating conveyor belt 211 has an adsorption hole 2110, which is connected to a negative pressure component.

[0121] Specifically, the coating conveyor belt 211 is a flexible conveyor belt that combines sheet material conveying and support functions. Its bearing surface (i.e., the side in contact with the sheet material) serves as the sheet material support part 210. The coating conveyor belt 211 extends along the production direction through the pre-coating unit 20. After the sheet material is conveyed from the sheet material supply unit 10 to the coating conveyor belt 211, it is carried by the coating conveyor belt 211 and continuously conveyed to the coating station of the pre-coating unit 20 as the belt surface moves. At the coating station, the coating conveyor belt 211 can be paused (step-by-step transmission, the coating operation is completed when the sheet material stops) or run continuously (continuous transmission, the coating operation is completed while the sheet material is in motion). After the sheet material is coated, it continues to move with the coating conveyor belt 211 and is conveyed to the bag making unit 30.

[0122] The adsorption hole 2110 is a through hole opened on the upper bearing surface of the adhesive coating conveyor belt 211. The adsorption hole 2110 is connected to a negative pressure chamber located inside the adhesive coating conveyor belt 211 through a negative pressure communication mechanism. The negative pressure chamber is connected to a negative pressure component (such as a vacuum pump or vacuum generator) through a pipeline. When the negative pressure component is running, it generates an air pressure lower than atmospheric pressure in the negative pressure chamber, causing external air to flow towards the negative pressure chamber through the adsorption hole 2110. This generates a downward adsorption force on the sheet material at the opening of the adsorption hole 2110, tightly fixing the sheet material to the upper bearing surface of the adhesive coating conveyor belt 211. When the adhesive coating component 220 applies pressure to the sheet material for adhesive coating, the negative pressure adsorption force can resist the thrust generated by the adhesive coating pressure on the sheet material, keeping the sheet material stationary throughout the adhesive coating process, thereby ensuring the accuracy of the adhesive coating position.

[0123] This application does not limit the specific structure and connection method of the adhesive-coating conveyor belt 211 and the negative pressure component. For example,

[0124] In one embodiment, the adhesive coating conveyor belt 211 can be a polyurethane flat belt with circular adsorption holes 2110 evenly arranged in a matrix on the belt surface. The belt body is wound around the driving roller and driven roller at both ends to form an annular transmission loop. A negative pressure chamber is provided on the inner side of the belt body along the length of the adhesive coating station. The top surface of the negative pressure chamber is attached to the inner side of the belt body to form a dynamic seal. When the adsorption holes 2110 on the belt body pass over the negative pressure chamber, they communicate with the inside of the negative pressure chamber to generate adsorption force. The negative pressure chamber is connected to an external vacuum pump through a pipeline. The vacuum pump runs continuously to maintain the negative pressure in the negative pressure chamber.

[0125] In another embodiment, the adhesive coating conveyor belt 211 can be a stainless steel wire mesh belt. The mesh belt itself has an adsorption hole 2110 structure formed by the mesh holes. A negative pressure hood can be set below the mesh belt at the adhesive coating station position. The opening of the negative pressure hood faces upward and contacts the inside of the mesh belt to form a sealed area. The negative pressure hood is connected to a vacuum pump through a pipeline. The mesh holes generate adsorption force in the area covered by the negative pressure hood.

[0126] In another embodiment, the adhesive-coated conveyor belt 211 can also be a thick rubber conveyor belt with multiple rows of parallel adsorption grooves on its surface. The adsorption grooves are connected to a pre-set air channel network inside the conveyor belt, and the air channel network can be connected to an external vacuum pipeline at both ends of the conveyor belt through air channel connectors.

[0127] Based on the bag-making equipment with the above-described structure of this application, in this embodiment, at least one station of the bag body making unit 30 (for example, it may be one of the folding part 320, the handle fixing part 330, and the forming part 310, or two of them, or all of them) is also provided with an auxiliary glue-applying component 340 (such as... Figure 7 The folded edge portion 320 shown is provided with an auxiliary glue applicator 340; the pre-coating unit 20 applies water-based glue (i.e., an adhesive with water as the dispersion medium) to the preset glue application area on the sheet material, and the auxiliary glue applicator 340 applies hot melt adhesive (i.e., a hot melt adhesive) or pressure-sensitive adhesive (i.e., an adhesive that is sensitive to pressure and sticks upon contact) to the auxiliary glue application area on the sheet material.

[0128] Specifically, water-based adhesives are a type of adhesive that uses water as a dispersion medium and high molecular polymers (such as acrylates and polyvinyl acetate) as the main components. After application, water-based adhesives cure into a film by penetrating water into the substrate. Their molecular chains can penetrate into the internal fibrous structure of porous substrates such as paper and non-woven fabrics along with water molecules, resulting in a thick adhesive layer and a long adhesion retention time.

[0129] Hot melt adhesives are a type of adhesive based on thermoplastic polymers (such as ethylene-vinyl acetate copolymers, polyolefins, etc.). They are solid at room temperature, melt upon heating, and exhibit good flowability. After application, they cure rapidly as the temperature drops to room temperature, producing high initial bond strength without waiting time. They are suitable for workstations requiring immediate bonding, such as immediate fixing after handle installation or rapid shaping after folding. Pressure-sensitive adhesives are a type of adhesive that has permanent tack at room temperature and requires only slight contact pressure to bond.

[0130] Those skilled in the art should understand that the positional relationship between the auxiliary adhesive application area and the preset adhesive application area can be flexibly set according to product requirements. If the auxiliary adhesive application area and the preset adhesive application area are in the same position, the water-based adhesive and the hot melt adhesive or pressure-sensitive adhesive are superimposed in the same area. The water-based adhesive is responsible for long-term adhesion and maintenance, while the hot melt adhesive or pressure-sensitive adhesive is responsible for immediate initial curing. The two can work together to make the adhesion performance of the area more comprehensive. If the auxiliary adhesive application area and the preset adhesive application area are staggered, the adhesive with the most matching performance is used in different areas.

[0131] This application does not limit the specific structure of the auxiliary adhesive application component 340. For example, in one embodiment, the auxiliary adhesive application component 340 can be a hot melt adhesive spray gun. The hot melt adhesive spray gun has a built-in electric heating module to keep the hot melt adhesive in a molten state. The spray gun head is controlled by a solenoid valve to spray the molten hot melt adhesive onto the auxiliary adhesive application area in a point or line spray manner when the control signal is triggered.

[0132] In another embodiment, the auxiliary adhesive application component 340 can also be a pressure-sensitive adhesive roller coating device. The pressure-sensitive adhesive roller coating device includes a glue tank containing pressure-sensitive adhesive liquid and a transfer roller immersed in the glue tank. The transfer roller transfers the pressure-sensitive adhesive liquid in the glue tank to the surface. After the film thickness is controlled by a scraper, the pressure-sensitive adhesive liquid is transferred from the surface of the transfer roller to the coating roller in contact with it. The coating roller presses against the auxiliary adhesive application area of ​​the sheet to complete the uniform coating of the pressure-sensitive adhesive.

[0133] In another embodiment, the auxiliary adhesive applicator 340 can also be a hot melt adhesive applicator head. The hot melt adhesive applicator head can be provided with a heat preservation and heating chamber and a slit-type adhesive outlet. The hot melt adhesive is kept molten in the heat preservation and heating chamber and pumped to the slit-type adhesive outlet at a stable flow rate by a metering pump. It is then uniformly extruded from the adhesive outlet in a wide area to form a thin and uniform hot melt adhesive film covering the auxiliary adhesive applicator area.

[0134] The cup sleeve provided by this utility model can be applied to various conical cups such as milk tea cups and coffee cups. Moreover, through the above design, this cup sleeve not only has a simple manufacturing process and saves more materials, but also has extremely strong structural stability. It can reduce the manufacturing cost of the cup sleeve and improve the structural stability of the cup sleeve during use while taking into account heat insulation and portability.

[0135] The above description illustrates the implementation of this utility model through specific embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details are included in the above description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0136] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0137] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the 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 the utility model.

[0138] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0139] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

Claims

1. A bag-making device, characterized in that, This includes a sheet material supply unit, a pre-coating unit, and a bag manufacturing unit arranged sequentially along the production direction; among which... The sheet material supply unit receives sheet materials from the storage bin and conveys the sheet materials one by one along the production direction; The pre-coating unit receives the sheet material from the sheet material supply unit and applies adhesive to the pre-defined adhesive application areas on the sheet material; and The bag manufacturing unit receives the pre-coated sheet material and manufactures the bag body.

2. The bag-making equipment as described in claim 1, characterized in that, The sheet material from the sheet material supply unit has multiple pre-coated areas, each pre-coated area located at a different location on the same side surface of the sheet material; and The pre-applied adhesive unit applies adhesive to each of the pre-applied adhesive areas simultaneously or sequentially.

3. The bag-making equipment as described in claim 2, characterized in that, The bag manufacturing unit includes a forming section, which forms the sheet material into a bag body, and the pre-coated adhesive section includes an edge sealing adhesive section located on the main body of the sheet material.

4. The bag-making equipment as described in claim 2, characterized in that, The bag manufacturing unit includes a folded edge portion, which folds over the side fold of the sheet material and at least partially adheres the side fold to the main body of the sheet material; and the pre-applied adhesive portion includes a folded adhesive portion located at the side fold of the sheet material; and / or The bag manufacturing unit further includes a handle fixing part; wherein the handle fixing part fixes the end of the handle to the corresponding position of the side folding part or the main body part of the sheet material; and the pre-coated part also includes a handle adhesive part located at the side folding part and / or the main body part of the sheet material.

5. The bag-making equipment according to any one of claims 1 to 4, characterized in that, The pre-coating unit includes a sheet support and a coating component; and... The sheet material support has a support platform for supporting the sheet material. The adhesive application component is arranged opposite to the support platform in a direction perpendicular to the support platform. The adhesive application component has an adhesive application part that is adapted to a preset adhesive application area on the sheet material. Each adhesive application part can apply adhesive to the corresponding preset adhesive application area.

6. The bag-making equipment as described in claim 5, characterized in that, The adhesive application component is an adhesive application roller, and the adhesive application section is a flexible adhesive application structure that protrudes from the outer peripheral wall of the adhesive application roller and extends toward the support platform; wherein The sheet material is laid flat on the support platform and can move along the conveying direction on the support platform. The glue-applying roller moves toward the sheet material, presses onto the sheet material, and rotates synchronously with the sheet material. Each of the flexible glue-applying structures sequentially covers the corresponding preset glue-applying area; or... The sheet material is laid flat on the support platform, the glue roller moves toward the sheet material, presses onto the sheet material and rotates relative to the support platform along the transmission direction, and each of the flexible glue coating structures sequentially covers the corresponding preset glue coating area.

7. The bag-making equipment as described in claim 6, characterized in that, The flexible coating structure is configured as a coating cotton that can be detachably connected to the component body of the coating component.

8. The bag-making equipment as described in claim 5, characterized in that, The adhesive coating component is an adhesive coating plate, and the adhesive coating section is a flexible adhesive coating structure disposed on the side of the adhesive coating plate facing the support platform and extending towards the support platform; wherein... The sheet material is laid flat on the support platform, the adhesive coating component moves toward the sheet material, and each of the flexible adhesive coating structures simultaneously covers the corresponding preset adhesive coating area.

9. The bag-making equipment as described in claim 5, characterized in that, It also includes a coating conveyor belt extending along the production direction through the pre-coating unit, wherein one side of the coating conveyor belt carrying the sheet material serves as a sheet material support portion; and... The sheet material support portion of the adhesive-coating conveyor belt has adsorption holes, which are connected to a negative pressure component.

10. The bag-making equipment as described in claim 5, characterized in that, At least one station in the bag manufacturing unit is also equipped with an auxiliary glue-applying component; wherein The pre-coating unit applies water-based adhesive to the preset coating area on the sheet, and the auxiliary coating component applies hot melt adhesive or pressure-sensitive adhesive to the auxiliary coating area on the sheet.

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