Membrane cutting tool for rapidly cutting off roll core diaphragm

Abstract

The utility model discloses a membrane cutting tool for rapidly cutting off a roll core membrane, which relates to the technical field of roll core membrane cutting tools and comprises a hook knife body, a tool grip and a grip tail end barb. The knife back of the hook knife body is horizontally designed, the knife edge is bent inwards to form an arc surface, the curvature radius R is 5-8 mm, the knife back is attached to the surface of a roll core in a sliding mode, and the knife edge is only in contact with a waste film; through the hook blade design and the blade back horizontal attaching structure, physical isolation of the blade and the roll core is achieved, and the damage rate of the roll core is reduced; and the grip barb provides a lever fulcrum, so that the cutting force application strength is reduced.

Description

Technical Field

[0001] This utility model relates to the field of core film cutting tools, specifically to a film cutting tool for quickly cutting off the core diaphragm. Background Technology

[0002] In the production of lithium-ion battery separators, slitting is a crucial step. The main task of this step is to cut the large sheets of film produced into small rolls conforming to specific specifications according to the customer's actual needs. Typically, these rolls are wound onto standard cores, with six-inch and three-inch cores being the most common sizes. During the slitting process, to ensure the quality and appearance of the rolls, the tension of the slitting machine needs to be precisely controlled, ensuring the rolls are tightly wound onto the core. The tension is usually controlled between a few Newtons and tens of Newtons to ensure the surface hardness and structural compactness of the rolls.

[0003] However, in practice, not all slit film rolls meet quality standards; some products may be scrapped due to substandard performance or winding process issues. The traditional method for handling these substandard rolls is to cut off the film from the core and recycle the core for reuse, thereby reducing costs. However, this process relies on the core maintaining a good appearance, free from dents or scratches, to avoid customer complaints due to core quality problems.

[0004] The commonly used tool for processing waste film rolls is currently the utility knife. While utility knives are generally sufficient for cutting film, they present several problems in practice. First, due to the high surface hardness of the film roll, it's difficult to apply force with a utility knife, making it easy for operators to cut themselves due to improper force, posing a serious safety hazard. Second, as a reusable component, if the roll core is scratched by a utility knife during film cutting, it will directly affect its subsequent use and may even lead to the core being scrapped, resulting in unnecessary waste. Finally, to avoid cutting the roll core, operators often leave a portion of the film on it and then manually tear it off. This not only increases the complexity of the operation but also significantly reduces work efficiency, adding 2-3 minutes to the processing time per roll.

[0005] In summary, existing utility knife blades pose safety hazards, damage to the core, and low efficiency when processing waste lithium battery separator rolls. There is an urgent need for a safer, more efficient cutting tool that will not damage the core. Utility Model Content

[0006] The purpose of this invention is to provide a cutting tool for quickly cutting off the diaphragm of a roll core, thus solving the problem of damage caused by the blade directly contacting the roll core when cutting with a traditional utility knife.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A film-cutting tool for quickly cutting off the diaphragm of a roll core includes a curved blade body, a tool handle, and a barb at the end of the handle; the back of the curved blade body is designed to be horizontal, and the blade is curved inward to form an arc surface with a radius of curvature R of 5-8mm; the back of the blade slides in contact with the surface of the roll core, and the blade only contacts the waste film.

[0009] As a further aspect of this utility model: the hook angle of the hook blade body is 30°-60°, which can adapt to the cutting requirements of different tension film rolls.

[0010] As a further aspect of this invention, the thickness of the blade is 0.5-1.0 mm, and different thicknesses are selected according to the film roll tension to balance cutting efficiency and blade strength.

[0011] As a further embodiment of this utility model: the knife handle is made of plastic, with anti-slip texture on the surface, and a barb at the grip end to provide a lever fulcrum to reduce the applied force.

[0012] As a further embodiment of this invention, the end of the barb is covered with a rubber pad to enhance anti-slip properties and comfort during operation.

[0013] As a further embodiment of this utility model: the curved knife body and the knife handle are detachably connected to accommodate different sizes of cores.

[0014] As a further aspect of this invention, the surface of the blade that contacts the core is coated with a wear-resistant coating to reduce the risk of scratching the core due to sliding friction.

[0015] As a further aspect of this utility model: the radius of curvature R of the blade is 6mm, which is suitable for cutting film rolls with a tension of 10-15N.

[0016] As a further embodiment of this utility model, the length of the knife handle is 120-180mm to meet the gripping needs of different operators.

[0017] As a further embodiment of this utility model, the detachable connection method is a threaded connection or a snap-lock, which enables quick replacement of the blade body.

[0018] The beneficial effects of this utility model are as follows: Compared with traditional straight-blade utility knives, this utility model achieves physical isolation between the blade and the core through the curved blade design and the horizontal fit structure of the blade back, thereby reducing the core damage rate; the barbed handle provides a lever fulcrum, reducing the cutting force intensity. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of a film-cutting tool for quickly cutting off the core diaphragm according to the present invention.

[0021] In the picture: 1. The body of the curved knife; 1a. The back of the knife; 1b. The blade; 2. The knife handle; 3. The barb; 3a. The rubber pad. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention / utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention / utility model, and not all embodiments. Based on the embodiments of the present invention / utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention / utility model.

[0023] In the description of this invention / utility model, it should be understood that the terms "upper," "lower," "left," "right," etc., indicating orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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 a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0024] In the description of this invention / utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., 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 communication between 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.

[0025] Please see Figure 1 As shown, this utility model is a film cutting tool for quickly cutting off the core diaphragm, including a curved blade body 1, a tool handle 2 and a barb 3 at the end of the handle; the back 1a of the curved blade body 1 is horizontally designed, and the blade 1b is curved inward to form an arc surface with a radius of curvature R of 5-8mm. The back 1a slides in contact with the core surface, and the blade 1b only contacts the waste film.

[0026] In an optional embodiment, the hook angle of the curved blade body 1 is 30°-60°, and the angle selection is directly related to the membrane roll tension. A smaller angle, such as 30°, is suitable for low-tension membrane rolls ≤10N, with less cutting resistance; a larger angle, such as 60°, is suitable for high-tension membrane rolls ≥15N, increasing the contact area to distribute the cutting pressure and preventing the blade from chipping due to excessive local stress. For example, when cutting a soft membrane with a tension of 8N, using a 30° hook angle allows the operator to complete the cut with just a light pull; while when processing a hard membrane with a tension of 18N, switching to a 60° hook angle ensures that the blade is evenly stressed, the cutting process is smooth, and the success rate of a single cut increases to 98%.

[0027] In an optional embodiment, the blade 1b has a thickness of 0.5-1.0 mm. A thin blade of 0.5 mm is suitable for low-density or soft film rolls, reducing cutting resistance; a thick blade of 1.0 mm is used for high-tensile or hard films containing reinforcing fibers, enhancing the blade's resistance to bending. For example, when cutting a 50 μm thick polypropylene soft film, using a 0.5 mm thin blade reduces cutting resistance by 40% and extends the blade life to over 1000 cuts; when cutting a hard film with a ceramic coating, using a 1.0 mm thick blade results in no blade deformation and extends the life to 500 cuts.

[0028] In one optional embodiment, the anti-slip texture of the knife grip 2 features a diamond-shaped raised design, with the barb 3 forming a 15° angle with the grip, creating a lever fulcrum. When the operator grips the handle, their index finger rests against the barb 3, utilizing the lever principle to reduce effort during cutting. In specific continuous cutting operations, the operator uses the barb 3 for leverage, reducing the force applied to the hand from 10N to 5N, thus reducing fatigue during a day's work. Furthermore, the anti-slip texture maintains a stable grip even in oily environments.

[0029] In an optional embodiment, the rubber pad 3a at the end of the barb 3 is made of silicone, 2mm thick, with a microporous structure on the surface to enhance friction. The rubber pad 3a is fixed by a slot and can be replaced individually. In a humid workshop environment, even when the operator's hands are sweaty, the rubber pad 3a can still provide sufficient friction to prevent the tool from slipping and reduce the cutting error rate.

[0030] In an optional embodiment, the detachable connection is achieved via a standard M6 threaded interface, with a positioning pin at the connection between the blade body 1 and the handle 2 to ensure precise angle after installation. When adapting to different sizes of coil cores, only the blade body with the corresponding hook length needs to be replaced. For example, when switching from a 6-inch coil core to a 3-inch coil core, the operator unscrews the original 50mm hook length of the blade body and replaces it with a 30mm hook body, which takes only 8 seconds, maintaining a cutting accuracy of ±0.1mm.

[0031] In an optional embodiment, the wear-resistant coating on the blade back 1a is made of tungsten carbide (WC) material with a thickness of 0.1 mm, and is applied by plasma spraying. The surface roughness of the coating Ra is ≤0.2 μm, and the coefficient of sliding friction is reduced to below 0.15.

[0032] In an optional embodiment, the radius of curvature R of the blade 1b is 6mm, and the contact line length between the arc surface and the film roll is approximately 15mm, ensuring that the blade is subjected to uniform force during cutting and avoiding localized stress concentration. For example, when cutting a PET film with a tension of 12N, the 6mm radius of curvature allows the blade to adhere tightly to the film surface, increasing the one-time cutting completion rate from 80% to 95%, with no film residue.

[0033] In one optional embodiment, the handle 2 has a length ranging from 120 to 180 mm. A shorter handle of 120 mm is suitable for operators with smaller hands, while a longer handle of 180 mm further reduces the force required by increasing the lever arm length. For example, an operator who is 160 cm tall using a 120 mm handle will have their single cutting time reduced by 20%; an operator who is 185 cm tall using a 180 mm handle will have their force required reduced by 35%, thus improving work efficiency.

[0034] In one optional embodiment, the detachable connection method includes a magnetic snap-fit ​​and a quick-release latch. The magnetic snap-fit ​​facilitates one-handed operation, while the quick-release latch is quickly locked by a spring pin. In an emergency replacement scenario, the operator presses the spring pin of the quick-release latch, and the blade body can be removed within 1 second. After replacement, the magnetic snap-fit ​​automatically snaps into place, with the total time not exceeding 3 seconds.

[0035] The working principle of this utility model is as follows: When using the knife, hold the handle 2 and cut the film roll from one end with the hook part of the curved blade body 1. Pull the handle 2 towards the other end, and the blade 1b will cut the film. Further, while slowly pulling towards the other end, the curved blade body 1 will slowly cut the film until it reaches the other end. When cutting to the surface of the core, since the back of the blade 1a at the tip is parallel to the core, the back of the blade 1a slides against the core to cut off the remaining film on the surface of the core. Since the blade 1b never operates towards the core, the knife will not damage the core.

[0036] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A film-cutting tool for quickly cutting off the core diaphragm, characterized in that, The hook-shaped knife body (1), the knife handle (2) and the handle end hook (3); the back (1a) of the hook-shaped knife body (1) is horizontally designed, the cutting edge (1b) is inwardly curved to form an arc surface, the curvature radius R is 5-8 mm, the back (1a) is in surface contact with the core surface and slides, and the cutting edge (1b) only contacts the waste film.

2. The core separator knife of claim 1, wherein, The hook angle of the hook-shaped knife body (1) is 30-60°.

3. The core separator knife of claim 1, wherein, The thickness of the cutting edge (1b) is 0.5-1.0 mm.

4. The core separator knife of claim 1, wherein, The knife handle (2) is made of plastic material, the surface is provided with anti-skid lines, and the holding end is provided with a hook (3).

5. The core separator knife of claim 4, wherein the cutting edge is formed by a cutting surface of the cutting head. The hook (3) is covered with a rubber pad (3a) at the end.

6. The core separator knife of claim 1, wherein, The hook-shaped knife body (1) and the knife handle (2) are detachably connected.

7. The core separator knife of claim 1, wherein, The surface of the back (1a) in contact with the core is coated with a wear-resistant coating.

8. The core separator knife of claim 1, wherein, The arc curvature radius R of the cutting edge (1b) is 6 mm.

9. The core separator knife of claim 1, wherein, The length of the knife handle (2) is 120-180 mm.

10. The core separator knife of claim 6, wherein, The detachable connection mode is screw connection or buckle locking.

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