A processing device for a composite plastic packaging film with a tearable opening
By using centrifugal spinning and positive pressure air extrusion, the problems of uneven adhesive layer and leakage in composite plastic packaging films have been solved, achieving uniformity and controllability of the adhesive layer, and improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGXI RONGXIAN FENGCAI PRINTING IND
- Filing Date
- 2025-09-04
- Publication Date
- 2026-07-21
Smart Images
Figure CN224528193U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of composite plastic packaging film processing technology, specifically to an easy-tear composite plastic packaging film processing device. Background Technology
[0002] The design of easy-tear openings on outer packaging bags is a key element in enhancing user experience and product usability. This design is already widespread in the market; for example, common tissue packaging uses a perforated easy-tear opening, which involves creating continuous or intermittent perforations in the packaging bag. However, in the hygiene product sector, a balance must be struck between easy opening and protective packaging. Safety and hygiene requirements for products such as sanitary napkins, diapers, and medical dressings are becoming increasingly stringent, necessitating that hygiene requirements be met while designing easy-tear openings. Therefore, based on market demand, composite plastic packaging films are becoming increasingly popular. The processing steps involve first cutting the outer film using methods such as cold cutting (e.g.,...). Figure 10 (As shown), then an inner film is attached, and the cut is completely sealed by bonding the inner and outer films. Using composite plastic packaging film enables an easy-tear design for the product packaging, improving the user experience. At the same time, the cut is completely sealed, preventing contamination during product transportation and ensuring that the relevant hygiene products meet hygiene requirements.
[0003] However, in the current processing of the aforementioned composite plastic packaging film, the outer film is first cut (cut through) using a cold-cutting knife or similar method. After entering the lamination process, the inner film is traditionally glued with a roller brush, then the surface of the inner film is coated with glue, and then excess glue is scraped off by mechanical contact using a scraper. Finally, it is pressed together with the outer film. The above method has the following problems in processing: 1. The simple mechanical scraping of glue by the scraper on the inner film (thin film) will result in uneven glue layer on the inner film, which can easily lead to glue seeping out from the cuts after pressing, thus affecting product quality; 2. After the inner and outer films are pressed together, they need to go through a drying process to promote glue curing. However, in order to ensure 100% curing of the glue in the entire composite film, sufficient drying time must be calculated based on the thickest glue area, which leads to a longer curing time, higher energy consumption, and reduced production efficiency. Utility Model Content
[0004] This invention provides a device for processing easy-tear composite plastic packaging film to solve the problems in the background art.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A processing device for easy-tear composite plastic packaging film includes a film gluing device, which comprises a device body. A centrifugal cavity is provided within the device body, and a centrifugal rotating roller is rotatably mounted within the centrifugal cavity. A glue-spinning screen cylinder is mounted on the centrifugal rotating roller. The glue-spinning screen cylinder is hollow and has several screen holes on its side wall. A glue inlet pipe is provided on one side of the glue-spinning screen cylinder, and the glue inlet pipe is connected to a glue delivery pipe via a rotary joint. An extrusion screen plate is axially arranged on the side wall of the centrifugal cavity, and the extrusion screen plate has several glue outlet holes. The extrusion screen plate is radially aligned with the glue-spinning screen cylinder. The centrifugal cavity also has an air inlet connected to a positive pressure air pipe. A glue recovery pipe is provided at the lower part of the centrifugal cavity.
[0006] Optionally, the centrifugal rotating roller includes a left rotating head and a right rotating head, which are respectively fixed to both sides of the centrifugal cavity by sealed bearings; the glue-spraying screen cylinder is arranged between the left rotating head and the right rotating head; the left rotating head is provided with a glue inlet chamber corresponding to the glue-spraying screen cylinder, and a connecting pipe is provided on its left side, which is connected to the rotary joint; the right rotating head is provided with a glue discharge chamber corresponding to the glue-spraying screen cylinder, and the side wall of the glue discharge chamber is provided with a plurality of glue discharge holes.
[0007] Optionally, a connecting shaft is provided along the central axis of the spun glue screen cylinder, and the left and right ends of the connecting shaft are respectively connected to the left rotating head and the right rotating head; a drive shaft is provided on the outer side of the right rotating head, and the rotational power is transmitted by the drive shaft to realize the rotation of the centrifugal rotating roller.
[0008] Optionally, the inner cavity of the glue-spinning screen cylinder has a conical structure with a diameter that gradually increases from left to right.
[0009] Optionally, the extrusion screen plate has an outwardly convex arc-shaped structure and is disposed at the top of the centrifugal cavity.
[0010] Optionally, the extrusion screen plate has an inwardly recessed arc-shaped structure and is located in the upper middle part of the centrifugal cavity.
[0011] Optionally, it also includes an adhesive return tank, which is provided with a liquid inlet, a circulation return port, and a circulation outlet; the circulation return port is connected to the adhesive recovery pipe through a pipeline; the circulation outlet is connected to the adhesive delivery pipe through a pipeline; and an adhesive pump is provided between the circulation outlet and the adhesive delivery pipe.
[0012] Optionally, it also includes a positive pressure gas cylinder, the outlet of which is connected to the positive pressure gas pipe.
[0013] Optionally, the extrusion screen plate is provided with one or more rows of glue outlet holes along the axial direction; when there are two or more rows of glue outlet holes, the glue outlet holes are staggered with each other.
[0014] Optionally, a smoothing roller and / or a hot air blower are also provided, wherein the smoothing roller contacts the glued inner or outer film conveyed by the drive roller; and the hot air blower blows air onto the glued inner or outer film.
[0015] Compared with the prior art, the beneficial effects of this utility model are: This invention is used to process composite films with easy-tear lines. It employs a centrifugal method to eject adhesive droplets, whereby the adhesive is first centrifuged into numerous tiny droplets and evenly adhered to the inner side of an extrusion screen. Then, positive pressure forces the adhesive out onto the outer side of the screen, significantly improving the uniformity of adhesive distribution on the outer side of the screen. This results in uniform and controllable adhesive coating on the film, as well as consistent adhesive layer thickness. After lamination, this ensures the bonding strength of the inner and outer film layers and prevents adhesive leakage, sagging, and other defects during lamination. Furthermore, the uniform adhesive coating improves the stability of the outer film's cut area during the lamination process, ensuring a tight fit along the entire cut of the composite film and uniform easy-tear line width after extrusion, thus significantly improving product quality. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0017] Figure 1 This is a schematic diagram of the film coating device of this utility model; Figure 2 This is a schematic diagram of the assembly structure of the film coating device and the film transmission roller of this utility model; Figure 3 This is a schematic diagram of the assembly structure of the second embodiment of the film coating device of this utility model and the film transmission roller body; Figure 4 This is a schematic diagram of the assembly structure of the easy-tear composite plastic packaging film processing device of this utility model; Figure 5 This is a cross-sectional view of the inner side of the extrusion screen plate of this utility model after a layer of glue has been attached. Figure 6 yes Figure 5 A cross-sectional view of the glue after it has been pressed out of the extrusion screen. Figure 7 This is a top view of an embodiment in which the extrusion screen plate is provided with two rows of extrusion holes; Figure 8 This is a schematic diagram of an embodiment equipped with a smoothing roller; Figure 9 Is Figure 8 A structural diagram showing the addition of a hot air blowing component to the existing design; Figure 10 This is a production process diagram showing the outer film being cut using a cold-cutting blade. Figures 11-12 This is a product illustration of the easy-tear composite plastic packaging film produced using the technical solution of this utility model. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0019] In the description of this utility model, it should be noted that the terms "inner", "front", "rear", "left", "right", 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 this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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 utility model based on the specific circumstances.
[0021] An easy-tear composite plastic packaging film processing device, such as Figure 1As shown, the device includes a film coating apparatus 14, which comprises a device body. In this embodiment, a support base 5 is provided at the lower part of the device body. A centrifugal cavity 1 is provided inside the device body, and the radial cross-section of the centrifugal cavity 1 is circular. A centrifugal rotating roller 6 is rotatably arranged inside the centrifugal cavity 1, and a glue-spinning screen cylinder 4 is provided on the centrifugal rotating roller 6. The glue-spinning screen cylinder 4 is hollow and has a plurality of screen holes 4-1 on its side wall. A glue inlet pipe 18 is provided on one side of the glue-spinning screen cylinder 4. The glue inlet pipe 18 is connected to a glue delivery pipe 16 through a rotary joint 17, thereby enabling the glue inlet pipe 18 to deliver glue simultaneously during rapid rotation. An extrusion screen plate 11 is axially arranged on the side wall of the centrifugal cavity 1. The extrusion screen plate 11 has a plurality of glue outlet holes 42 and is radially arranged corresponding to the glue-spinning screen cylinder 4. The specific implementation of the extrusion screen plate 11 can have various configurations: such as Figure 3 As shown, in some embodiments, the first extrusion screen plate 11-1, which has an outwardly convex arc-shaped structure, is disposed at the top of the centrifugal cavity, that is, fixed at the top of the device body; and as shown in another embodiment... Figure 2 As shown, the second extrusion screen plate 11-2, with an inwardly curved structure, is located in the upper middle part of the centrifugal cavity. Both designs have advantages. For example, the first extrusion screen plate 11-1 can have only one row of the dispensing holes 42 (during preparation, the gaps between the dispensing holes 42 need to be relatively close), and during assembly, this row of dispensing holes 42 is positioned at the highest point, causing the outer side of the dispensing holes 42 to be extruded as... Figure 6 The hemispherical adhesive particles 25 shown are designed to facilitate better and more even adhesion of the adhesive to the plastic film; in some embodiments, such as Figure 8 As shown, a smoothing roller 21-1 can also be added between the transmission roller 21 (which can be driven by an independent motor) and the pressure roller 20, and the smoothing roller 21-1 contacts the inner film 22 after it has been coated with adhesive; the function of the smoothing roller 21-1 is to smooth the several dots of adhesive on the inner film 22 into a sheet-like adhesive layer. During assembly, the smoothing roller 21-1 can be installed according to common schemes, and it can be independently equipped with a drive motor to drive the smoothing roller 21-1 to rotate, such as... Figure 8 As shown, the rotation direction of the smoothing roller 21-1 is the same as that of the drive roller 21 and the pressure roller 20 (in this embodiment, ). Figure 8 The pressure roller assembly shown can be driven by an independent motor to convey the inner layer film 22 and the outer layer film 23 in the direction indicated by the arrow in the figure, so as to improve the coating effect.
[0022] Considering that solvent-based adhesives are used in some embodiments, a hot air blowing assembly can also be provided before the inner and outer film extrusion lamination, such as... Figure 9As shown, the hot air blowing assembly includes a lower partition 21-2 (used to separate from the glue coating area below, reducing the downward flow of hot air or guiding the hot air upward flow) and a hot air blower 21-3. After the inner layer film 22 is coated with glue by the smoothing roller 21-1, it is transferred to the hot air area to improve the viscosity of the glue on the surface of the inner layer film 22 by hot air blowing, and then enters the pressure roller 20 (pressure roller group) to press with the outer layer film 23.
[0023] The second extrusion screen plate 11-2 can be provided with two or more rows of the aforementioned glue outlet holes 42, such as... Figure 7 As shown, in this embodiment, two rows of adhesive dispensing holes 42 are provided, and these two rows of adhesive dispensing holes 42 are staggered with each other (during preparation, the gap between the same adhesive dispensing hole 42 can be set wider). The purpose of this design is that after the hemispherical glue particles 25 are extruded from the outer side of the adhesive dispensing holes 42, from the front side view of the two rows, the hemispherical glue particles 25 on the adhesive dispensing holes 42 can be evenly distributed along the axial direction, ensuring full coverage of the glue across the width of the plastic film. The centrifugal cavity 1 is also provided with an air inlet 12, which is connected to a positive pressure air pipe 15; the lower part of the centrifugal cavity 1 is provided with a glue recovery pipe 2. In use, as Figure 1 As shown, glue is input through glue delivery pipe 16 and enters the inner cavity of the glue-spinning screen cylinder 4. Driven by a power source, the glue-spinning screen cylinder 4 rotates rapidly, thus throwing the glue out through several screen holes 4-1 and onto the inner wall of the centrifugal cavity 1 and the inner wall of the extrusion screen plate 11. Then, positive air pressure is input into the centrifugal cavity 1 through the air inlet 12 via positive pressure pipe 15, thereby using the positive air pressure to squeeze the glue on the inner wall of the extrusion screen plate 11 outwards, thus obtaining the desired effect. Figure 6 The adhesive distribution effect is shown. In specific implementation, solvent-based adhesive is preferred. Solvent-based adhesive is used to improve the fineness of the droplets ejected during the centrifugation process. In production, the centrifugal rotating roller 6 and the extrusion screen 11 are cleaned regularly. In order to improve the cleaning efficiency, in some embodiments, the extrusion screen 11 can be detachably fixed to the device body, such as by means of snap-fit or screw connection.
[0024] Optionally, in this embodiment, such as Figure 1As shown, the centrifugal rotating roller 6 includes a left rotating head and a right rotating head, which are respectively fixed to both sides of the centrifugal cavity 1 by a sealed bearing 13; the glue-spraying screen cylinder 4 is arranged between the left rotating head and the right rotating head; the left rotating head is provided with a glue inlet chamber 19 corresponding to the glue-spraying screen cylinder, and a connecting pipe 18 is provided on its left side, which is connected to the rotary joint 17; the right rotating head is provided with a glue discharge chamber 9 corresponding to the glue-spraying screen cylinder, and the side wall of the glue discharge chamber 9 is provided with a plurality of glue discharge holes 10. To improve the overall rigidity of the centrifugal rotating roller 6, in this embodiment, a connecting shaft 3 is axially arranged at the center of the glue-spinning screen cylinder 4. The left and right ends of the connecting shaft 3 are respectively connected to the left rotating head and the right rotating head. In this embodiment, the right end of the connecting shaft 3 is fixedly connected to the right rotating head, and its left end is connected to the glue inlet cavity 19 through several connecting blocks to ensure that the glue can flow smoothly from the left side to the right side of the glue inlet cavity 19. The connecting shaft 3 can better and more stably transmit the power from the right side to the left side. A drive shaft 8 is arranged on the outer side of the right rotating head, and the rotational power is transmitted by the drive shaft 8 to realize the rotation of the centrifugal rotating roller 6. Figure 1 and Figure 4 As shown, in this embodiment, a driven pulley is provided on the drive shaft 8, which is connected to the main pulley of the motor 28 via a belt 27, thereby obtaining rotational power. In this embodiment, the inner cavity of the glue-spinning screen cylinder 4 has a conical structure with a diameter that gradually increases from left to right. The purpose of this design is that the axial cross-section of the glue inlet chamber 19 and the glue-spinning screen cylinder 4 is funnel-shaped, with an included angle of 1-30 degrees, preferably 3-8 degrees. Under the drive of the rotational driving force, the centrifugal rotating roller 6 rotates as a whole, and after the glue is input into the glue inlet chamber 19, it is subjected to centrifugal force, and the glue flows from left to right. By controlling the flow rate of the glue entering the glue inlet chamber 19, the entire glue-spinning screen is made to rotate during the operation of the equipment. The inner wall of the mesh cylinder 4 is covered with a layer of centrifugal glue, which is thrown outward through several sieve holes 4-1 due to centrifugal force. Some of it is thrown onto the inner wall of the extrusion sieve plate 11. The centrifugal glue-throwing method can make the glue adhere more evenly to the inner wall of the extrusion sieve plate 11. At the same time, the extrusion sieve plate 11 is set at the top and upper middle part, which also facilitates the automatic return of excess glue. The glue thrown onto the inner wall of the centrifugal cavity 1 will automatically return to the bottom under the action of gravity and be recycled through the glue recovery pipe 2.
[0025] Optional, such as Figure 4As shown, it also includes an adhesive return tank 31. In this embodiment, the adhesive return tank 31 is preferably a sealed return tank to maintain the normal air pressure of the entire system. The adhesive return tank 31 is provided with a liquid inlet 33, a circulation return port 30, and a circulation outlet 32. The circulation return port 30 is connected to the adhesive recovery pipe 2 through a pipe 29. When setting it up, the height of the adhesive return tank 31 can be lower than the height of the adhesive recovery pipe 2, so that the adhesive can be returned by gravity. The circulation outlet 32 is connected to the adhesive delivery pipe 16 through a pipe 36. An adhesive pump 35 is provided between the circulation outlet and the adhesive delivery pipe to pressurize and deliver the adhesive to the adhesive inlet chamber 19.
[0026] Optional, such as Figure 4 As shown, it also includes a positive pressure gas tank 39, the outlet 41 of which is connected to the positive pressure gas pipe 15; at the same time, in this embodiment, an air pump 37 is provided, which is connected to the air inlet 38 of the positive pressure gas tank 39 through a pipeline; the positive pressure gas tank 39 is provided with a constant pressure monitoring device 40, which starts the air pump 37 by monitoring the gas pressure value in the positive pressure gas tank 39 to ensure that the gas pressure value in the positive pressure gas tank 39 is stable within the set value.
[0027] The method for processing easy-tear composite plastic packaging films using this device, such as... Figures 2-3 As shown, it includes the following steps: S1: First, use a cold cutter or an ultrasonic wire cutter to cut the outer or inner membrane into a slit line. In this embodiment, the outer membrane 23 is selected to be cut. S2: Apply adhesive to the inner or outer layer film using the easy-tear composite plastic packaging film processing device described above; in this embodiment, adhesive is applied to the inner layer film 22, and the adhesive application method is as follows: The centrifugal roller is controlled to rotate, injecting glue into the glue-spinning screen cylinder through the glue inlet tube. The rotation of the screen cylinder generates centrifugal force, causing the glue inside to be centrifugally thrown out through the screen holes onto the inner wall of the centrifugal cavity and the extrusion screen plate. Figure 5 As shown, a layer of glue 43 is attached to the inner side of the extrusion screen plate 11; at the same time, positive air pressure is input into the centrifugal cavity through the air inlet; the positive air pressure forces the glue layer to be squeezed out from the glue outlet holes to the outer side of the extrusion screen plate, forming a number of hemispherical glue particles 25. S3: The inner or outer film is conveyed to the outer side of the extrusion screen plate or to the smoothing roller 21-1 via the transmission roller 21, and comes into contact with the hemispherical glue body 25. S4: If solvent-based adhesive is selected, hot air should be used to blow the inner film 22 to promote solvent evaporation; S5: The inner or outer film with adhesive is pressed together with the outer or inner film after the cut line is completed by the pressure roller 20 to form a composite film 24. S6: Constant temperature curing.
[0028] This invention is used to process composite films with tear lines. It employs centrifugal force to eject adhesive droplets, breaking them into numerous tiny droplets that adhere evenly to the inner side of an extrusion screen 11. Then, positive pressure forces the adhesive out onto the outer side of the screen 11, significantly improving the uniformity of adhesive distribution. This results in uniform and controllable adhesive coating and thickness. After lamination, it ensures the bonding strength of the inner and outer film layers and prevents adhesive leakage and sagging during lamination. Furthermore, the uniform adhesive coating improves stability in the outer film's cut area during the lamination process, ensuring tight adhesion and uniform tear line width after extrusion, thus significantly improving product quality. Its production effect is as follows: Figure 11-12 As shown.
Claims
1. A processing device for easy-tear composite plastic packaging film, characterized in that: The device includes a film coating apparatus, comprising a main body containing a centrifugal cavity. A centrifugal roller is rotatably mounted within the centrifugal cavity, and a glue-spinning screen cylinder is mounted on the centrifugal roller. The glue-spinning screen cylinder is hollow and has several screen holes on its sidewalls. A glue inlet pipe is located on one side of the glue-spinning screen cylinder, and the glue inlet pipe is connected to a glue delivery pipe via a rotary joint. An extrusion screen plate is axially mounted on the sidewall of the centrifugal cavity, and the extrusion screen plate has several glue outlet holes. The extrusion screen plate is radially aligned with the glue-spinning screen cylinder. The centrifugal cavity also has an air inlet connected to a positive pressure air pipe. A glue recovery pipe is located at the lower part of the centrifugal cavity.
2. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: The centrifugal rotating roller includes a left rotating head and a right rotating head, which are respectively fixed to both sides of the centrifugal cavity by sealed bearings; the glue-spraying screen cylinder is arranged between the left rotating head and the right rotating head; the left rotating head is provided with a glue inlet chamber corresponding to the glue-spraying screen cylinder, and a connecting pipe is provided on its left side, which is connected to the rotary joint; the right rotating head is provided with a glue discharge chamber corresponding to the glue-spraying screen cylinder, and the side wall of the glue discharge chamber is provided with a plurality of glue discharge holes.
3. The easy-tear composite plastic packaging film processing device according to claim 2, characterized in that: A connecting shaft is provided along the central axis of the spooling screen cylinder, and the left and right ends of the connecting shaft are respectively connected to the left rotating head and the right rotating head; a drive shaft is provided on the outer side of the right rotating head, and the rotation power is transmitted by the drive shaft to realize the rotation of the centrifugal rotating roller.
4. The easy-tear composite plastic packaging film processing device according to claim 2, characterized in that: The inner cavity of the glue-spinning screen cylinder has a conical structure with a diameter that gradually increases from left to right.
5. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: The extrusion screen plate has an outwardly convex arc-shaped structure and is located at the top of the centrifugal cavity.
6. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: The extrusion screen plate has an inwardly recessed arc-shaped structure and is located in the upper middle part of the centrifugal cavity.
7. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: It also includes an adhesive return tank, which is provided with a liquid inlet, a circulation return port and a circulation outlet; the circulation return port is connected to the adhesive recovery pipe through a pipeline; the circulation outlet is connected to the adhesive delivery pipe through a pipeline; and an adhesive pump is provided between the circulation outlet and the adhesive delivery pipe.
8. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: It also includes a positive pressure gas tank, the outlet of which is connected to the positive pressure gas pipe.
9. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: The extrusion screen plate is provided with one or more rows of glue outlet holes along the axial direction; when there are two or more rows of glue outlet holes, the glue outlet holes are staggered with each other.
10. The easy-tear composite plastic packaging film processing device according to claim 1, characterized in that: It is also equipped with a smoothing roller and / or a hot air blower, the smoothing roller contacting the glued inner or outer film conveyed by the drive roller; the hot air blower on the glued inner or outer film.