Stripping and recycling device for multi-layer composite film offcut

Abstract

The invention relates to the technical field of stripping of multi-layer composite film rim charges, in particular to a stripping and recycling device of multi-layer composite film rim charges, which comprises a rack, a conveying mechanism arranged on the rack and used for dragging and conveying the composite film rim charges; the floating type stripping mechanism comprises a knife rest, a separating knife mounted on the knife rest, a floating mounting assembly for connecting the knife rest to the rack and providing a movable freedom degree for the knife rest, and a position restraining and guiding assembly arranged between the rack and the knife rest. According to the invention, the floating type stripping mechanism is arranged, the separation knife is mounted on the movable knife rest, and the knife rest can adaptively displace when the stripping tension is changed by utilizing the matching of the floating mounting assembly and the position restraining and guiding assembly, and when the interlayer bonding force fluctuates, the knife rest drives the separation knife to move along a preset arc-shaped track, so that the separation knife is separated. And the forced stripping point is always limited in a preset optimal interval.

Description

Technical Field

[0001] This invention relates to the field of stripping technology for edge materials of multilayer composite films, and more specifically to a stripping and recycling device for edge materials of multilayer composite films. Background Technology

[0002] Multilayer composite films, such as food packaging films, lithium battery separators, and optical films, generate a large amount of continuous scrap during the slitting process. This scrap is usually made of two or more layers of plastic films of different materials, such as an outer PET layer and an inner PE layer, which are bonded together by adhesives or co-extrusion processes. To achieve high-quality recycling, the film layers of different materials must be completely peeled off and separated before being sorted, granulated, and recycled.

[0003] Currently, the existing technology for peeling and recycling edge materials of multilayer composite films mainly adopts fixed peeling mechanisms. For example, a pair of fixed peeling rollers or a separating blade at a fixed angle are used to separate the layers of the composite film by utilizing the tension during the film conveying process. However, in actual production applications, such fixed peeling mechanisms have the following technical problems.

[0004] The interlayer adhesion of multilayer composite films is not a constant value. It fluctuates due to factors such as raw material batches, composite process parameters, and storage environment temperature and humidity. At the same time, the ductility of different material layers varies. For example, the PE layer is softer and easier to stretch, while the PET layer is harder and less prone to deformation. When using a fixed peeling mechanism, if the peeling angle and peeling force are fixed, when the adhesion increases, insufficient peeling force will cause the peeling point to shift backward and the interlayers to not be completely separated, resulting in partially adhered "patchy" waste. When the adhesion decreases, the peeling force is relatively too large, which can easily stretch or even break the softer or thinner layer of film, leading to edge breakage, equipment shutdown, and seriously affecting recycling efficiency and product quality. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a peeling and recycling device for edge material of multilayer composite films, which can effectively solve the problem that the peeling angle and peeling force of the prior art can easily lead to poor product quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a stripping and recycling device for edge material of multilayer composite films, comprising: a frame, and a conveying mechanism disposed on the frame for pulling and conveying the edge material of the composite film;

[0008] A floating stripping mechanism includes a blade holder, a separating blade mounted on the blade holder, a floating mounting assembly that connects the blade holder to the frame and provides the blade holder with degrees of freedom of movement, and a position constraint and guiding assembly disposed between the frame and the blade holder;

[0009] When the blade holder is displaced due to changes in peeling tension, causing the separating blade to move, the position constraint and guiding component forces the blade of the separating blade to move along a predetermined arc trajectory, so as to limit the movement range of the peeling point of the separating blade on the edge of the composite film within a preset range.

[0010] Preferably, the floating mounting assembly includes an elastic element, one end of which is connected to the frame and the other end of which is connected to the tool holder.

[0011] Preferably, the position constraint and guiding assembly includes an arc-shaped guide rail disposed on the frame and a slide rod slidably disposed on the arc-shaped guide rail, the slide rod being fixedly connected to the separating blade.

[0012] Preferably, the floating peeling mechanism further includes a guide roller, which is rotatably mounted on the blade holder and located downstream of the separating blade along the conveying direction of the composite film edge material. The guide roller supports and guides the first film layer being peeled to change its conveying direction, so that the guide roller moves synchronously with the blade holder to adaptively follow the movement of the peeling point.

[0013] Preferably, the arc trajectory is a circular arc, and the center of the circular arc is parallel to the conveying path of the film edge material.

[0014] Preferably, it also includes an arc-shaped support plate, which is fixedly mounted on the frame.

[0015] Preferably, its arc surface faces the separating blade to support the second film layer after it has been peeled off, so that the second film layer is immediately supported at the peeling point.

[0016] Preferably, it further includes a first winding roller and a second winding roller, both of which are rotatably mounted on the frame and located downstream of the floating peeling mechanism; respectively winding the peeled film layer.

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0018] First, by setting up a floating peeling mechanism, the separating blade is installed on a movable blade holder. With the cooperation of the floating installation component and the position constraint and guide component, the blade holder can adaptively generate displacement when the peeling tension changes. When the interlayer adhesion force fluctuates, the blade holder drives the separating blade to move along a predetermined arc trajectory. The peeling point is always limited to the preset optimal range. It can increase the peeling force by moving the peeling point backward to achieve complete separation when the adhesion force increases, and it can reduce the peeling force by moving the peeling point forward to avoid film stretching or breakage when the adhesion force decreases. This fundamentally solves the problem of incomplete peeling or material breakage caused by the inability of the fixed peeling mechanism to adapt to the fluctuation of adhesion force, and realizes continuous, stable and high-quality peeling and recycling.

[0019] Secondly, the use of elastic elements as floating mounting components results in a simple structure and sensitive response, enabling real-time adjustment of the separating blade position based on changes in peeling resistance. A guiding assembly consisting of an arc-shaped guide rail and a sliding rod ensures the precision of the separating blade's trajectory and is coaxially aligned with the arc-shaped support plate, ensuring the second film layer receives immediate support at the peeling point and preventing film deformation or support loss due to peeling point movement. Simultaneously, the guide roller moves synchronously with the blade holder, adaptively following the peeling point to ensure the first peeled film layer is consistently and smoothly guided, effectively preventing deviation and tension fluctuations. Combined with the downstream first and second winding rollers, this achieves neat and orderly winding of film layers of different materials. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the floating peeling mechanism of the present invention;

[0023] Figure 3 This is a side view of the floating peeling mechanism of the present invention.

[0024] Reference numerals: 1. Frame; 2. Conveying mechanism; 3. Floating stripping mechanism; 31. Knife holder; 331. Elastic element; 32. Separating knife; 33. Floating mounting assembly; 34. Position constraint and guiding assembly; 341. Arc-shaped guide rail; 342. Slide bar; 35. Guide roller; 36. Arc-shaped support plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] The present invention will be further described below with reference to embodiments.

[0027] Includes: frame 1, conveying mechanism 2 mounted on frame 1 for pulling and conveying composite film edge material, conveying mechanism 2 consists of a raw material roller and a clamping conveying roller, the raw material roller winds the multi-layer composite film edge material to be separated, two clamping conveying rollers are provided, the multi-layer composite film edge material passes through the middle and is clamped and conveyed towards the separating blade 32, the clamping conveying roller can keep the multi-layer composite film edge material under a certain tension when clamping and conveying, the raw material roller and the clamping conveying roller can be driven to rotate by existing motors mounted on frame 1;

[0028] The floating peeling mechanism 3 includes a blade holder 31, a separating blade 32 mounted on the blade holder 31, a floating mounting assembly 33 that connects the blade holder 31 to the frame 1 and provides the blade holder 31 with a degree of freedom of movement, and a position constraint and guiding assembly 34 disposed between the frame 1 and the blade holder 31. The blade holder 3 is mounted on the frame 1 and is in the multilayer composite film edge material conveying direction.

[0029] Specifically, when the blade holder 31 is displaced due to the change in peeling tension, causing the separating blade 32 to move, the position constraint and guide assembly 34 forces the blade of the separating blade 32 to move along a predetermined arc trajectory, so as to limit the movement range of the peeling point of the separating blade 32 on the edge of the composite film within a preset range.

[0030] The floating mounting assembly 33 includes an elastic element 331, one end of which is connected to the frame 1 and the other end of which is connected to the tool holder 31. The elastic element 331 uses an existing spring.

[0031] The position constraint and guidance assembly 34 includes an arc-shaped guide rail 341 mounted on the frame 1 and a slide rod 342 slidably mounted on the arc-shaped guide rail 341. The slide rod 342 is fixedly connected to the separating blade 32. The arc-shaped guide rail 341 is symmetrically mounted in the frame 1 through an L-shaped frame and is respectively mounted on both sides of the separating blade 32. Mounting plates are installed on both sides of the separating blade 32 and connected to the slide rod 342.

[0032] Example 2, refer to Figures 2 to 3The floating peeling mechanism 3 also includes a guide roller 35, which is rotatably mounted on the knife holder 31 and located downstream of the separating knife 32 along the conveying direction of the composite film edge material. It is used to support and guide the first film layer to be peeled to change the conveying direction, so that the guide roller 35 moves synchronously with the knife holder 31 to adaptively follow the movement of the peeling point. The guide roller 35 is mounted between rotating mounting plates and below the separating knife 32.

[0033] Specifically, the arc trajectory is a circular arc, with the center of the arc parallel to the conveying path of the film edge material.

[0034] Example 2, refer to Figures 2 to 3 It also includes an arc-shaped support plate 36, which is fixedly mounted on the frame 1.

[0035] Its arc surface faces the separating blade 32 and is used to support the second film layer after it has been peeled off, so that the second film layer is immediately supported at the peeling point.

[0036] It also includes a first winding roller and a second winding roller, both of which are rotatably mounted on the frame 1 and located downstream of the floating peeling mechanism 3; respectively, the peeled film layer is wound around the film layer. The second winding roller and the first winding roller can be mounted on the frame 1 using existing fixed brackets and the film layer after separation is wound around using existing motor drives.

[0037] The working principle of this invention is as follows:

[0038] During operation, the conveying mechanism 2 is activated, pulling the edge material of the multilayer composite film along a preset path. At this time, under the initial elastic force of the elastic element 331, the separating blade 32 in the floating peeling mechanism 3 presses against the interlayer interface of the composite film edge material with a certain initial pressure, forming an initial peeling point. The first film layer that is peeled off passes downward around the guide roller 35, changes direction, and is wound up by the first winding roller. The second film layer continues to move along the arc-shaped support plate 36 and is finally wound up by the second winding roller.

[0039] If the adhesion between the composite film edge layers fluctuates during the stable peeling process, the floating peeling mechanism 3 of this device can automatically adapt to this change, thereby maintaining a stable peeling effect. Its core is that the separating blade 32 is no longer rigidly fixed, but obtains a controlled adaptive displacement capability through the combination of the floating mounting component 33 and the position constraint and guide component 34.

[0040] Specifically, when the interlayer adhesion increases due to material batches, process fluctuations, etc., the peeling resistance required for the blade of the separating knife 32 to separate the two films also increases. Under the condition that the traction tension provided by the conveying mechanism 2 is relatively constant, the increased peeling resistance will cause the peeling point to tend to move backward, that is, away from the conveying direction. At the same time, the force applied to the separating knife 32 also increases. This force is transmitted to the elastic element 331 through the knife holder 31, overcoming part of the elastic force of the elastic element 331, and forcing the knife holder 31 and the separating knife 32 to move backward along the trajectory defined by the arc guide rail 341. Since the blade of the separating knife 32 moves along a precise arc trajectory, the position of the peeling point on its blade on the edge of the composite film is also forced to move backward along a gentle arc. However, this movement is strictly limited to a preset range and will not move backward indefinitely. The moderate backward movement of the peeling point is equivalent to increasing the peeling angle and peeling lever arm, thereby automatically providing a greater peeling force to overcome the increased adhesion and ensure that the interlayer can still be completely separated.

[0041] Conversely, when the interlayer adhesion decreases, the resistance required for peeling decreases. Under the same traction tension, the force on the separating blade 32 decreases, and the elastic potential energy stored in the elastic element 331 is released, pushing the blade holder 31 and the separating blade 32 forward along the trajectory defined by the arc-shaped guide rail 341. The peeling point on the blade also moves forward along the arc-shaped trajectory. This is equivalent to reducing the peeling angle and peeling lever arm, so that the peeling force applied to the film layer automatically decreases, thereby avoiding the stretching and tearing of the softer or thinner film layer due to excessive peeling force.

[0042] In this process, the position constraint and guide component 34 plays a key role. Through the cooperation of the arc-shaped guide rail 341 and the slide bar 342, it forces the blade of the separating knife 32 to move along a predetermined arc, rather than an arbitrary straight line or curve. The beneficial effect of this forced guidance is that no matter how the peeling point moves due to the fluctuation of the adhesive force, its movement range is precisely limited to a preset arc-shaped range that can ensure effective peeling without damaging the film. At the same time, since the trajectory of the arc-shaped guide rail 341 is coaxial with the arc surface of the arc-shaped support plate 36, the gap between the blade of the separating knife 32 and the arc-shaped support plate 36 remains constant and optimal when the peeling point moves. This ensures that the second film layer is always supported by the arc-shaped support plate 36 at the peeling point and will not lose support or generate friction due to the movement of the peeling point.

[0043] In addition, the guide roller 35, which is installed on the same blade holder 31, moves synchronously with the blade holder 31. When the peeling point moves due to tension changes, the guide roller 35 also moves accordingly, so that it is always in the optimal contact position with the first film layer being peeled. This ensures that the first film layer can be smoothly guided to change direction immediately after peeling, avoiding film deviation, slippage or tension fluctuation caused by the movement of the peeling point, and ensuring the neatness and stability of subsequent winding.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stripping and recycling device for edge material of multilayer composite films, comprising: The frame (1) is characterized by a conveying mechanism (2) disposed on the frame (1) for pulling and conveying the composite film edge material; A floating stripping mechanism (3) includes a blade holder (31), a separating blade (32) mounted on the blade holder (31), a floating mounting assembly (33) connecting the blade holder (31) to the frame (1) and providing the blade holder (31) with a degree of freedom of movement, and a position constraint and guiding assembly (34) disposed between the frame (1) and the blade holder (31). When the blade holder (31) is displaced due to the change in peeling tension, causing the separating blade (32) to move, the position constraint and guide assembly (34) forces the blade of the separating blade (32) to move along a predetermined arc trajectory, so as to limit the movement range of the peeling point of the separating blade (32) on the composite film edge material within a preset range.

2. The stripping and recycling device for edge material of multilayer composite films according to claim 1, characterized in that, The floating mounting assembly (33) includes an elastic element (331), one end of which is connected to the frame (1) and the other end of which is connected to the tool holder (31).

3. The peeling and recycling device for edge material of multilayer composite films according to claim 1, characterized in that, The position constraint and guide assembly (34) includes an arc-shaped guide rail (341) disposed on the frame (1) and a slide rod (342) slidably disposed on the arc-shaped guide rail (341), the slide rod (342) being fixedly connected to the separating blade (32).

4. The stripping and recycling device for edge material of multilayer composite films according to claim 1, characterized in that, The floating peeling mechanism (3) further includes a guide roller (35), which is rotatably mounted on the knife holder (31) and located downstream of the separating knife (32) along the conveying direction of the composite film edge material. The guide roller (35) is used to support and guide the first film layer being peeled to change the conveying direction, so that the guide roller (35) moves synchronously with the knife holder (31) to adaptively follow the movement of the peeling point.

5. The stripping and recycling device for edge material of multilayer composite films according to claim 1, characterized in that, The arc trajectory is a circular arc, and the center of the arc is parallel to the conveying path of the film edge material.

6. The stripping and recycling device for edge material of multilayer composite films according to claim 1, characterized in that, It also includes an arc-shaped support plate (36), which is fixedly mounted on the frame (1).

7. The peeling and recycling device for edge material of multilayer composite films according to claim 6, characterized in that, Its arc surface faces the separating blade (32) to support the second film layer after it has been peeled off, so that the second film layer is immediately supported at the peeling point.

8. The stripping and recycling device for edge material of multilayer composite films according to claim 1, characterized in that, It also includes a first winding roller and a second winding roller, both of which are rotatably mounted on the frame (1) and located on the downstream side and downstream side of the floating peeling mechanism (3); respectively winding the peeled film layer.

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