CN111410097B - Paper core - Google Patents
Paper core Download PDFInfo
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- CN111410097B CN111410097B CN202010267485.6A CN202010267485A CN111410097B CN 111410097 B CN111410097 B CN 111410097B CN 202010267485 A CN202010267485 A CN 202010267485A CN 111410097 B CN111410097 B CN 111410097B
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- Prior art keywords
- elastic sleeve
- paper core
- thickness
- film
- bottom tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/18—Constructional details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/50—Storage means for webs, tapes, or filamentary material
- B65H2701/51—Cores or reels characterised by the material
- B65H2701/511—Cores or reels characterised by the material essentially made of sheet material
- B65H2701/5112—Paper or plastic sheet material
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Abstract
The invention discloses a paper core for winding and unwinding a film, which comprises a paper core bottom tube; the method is characterized in that: the outside of the paper core bottom tube is coated with a rubber or EVA elastic sleeve with a round surface; the Shore hardness C of the elastic sleeve is 15-80 degrees. According to the invention, the elastic sleeve with the Shore hardness C of 15-80 degrees is coated outside the paper core bottom tube, and the fluctuation of tension is offset through the elastic deformation of the elastic sleeve, so that the fluctuation of tension is more stable, the wrinkling of the surface of a rolled film is reduced, and the product yield is improved. According to the films with different thicknesses and different rolling tensions, the thickness of the elastic sleeve is set, the effect of reducing wrinkling on the surfaces of the films can be achieved with less elastic material, and the cost is saved. The paper core of the invention has simple and convenient processing operation, and the elastic sleeve pipe is tightly combined with the paper core bottom pipe.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a paper core for winding and unwinding a thin film and effectively reducing wrinkling of the thin film.
Background
The paper core is commonly used for winding and unwinding the film. In the process of film rolling, the film wrinkling phenomenon can occur, and the product yield is reduced. The reasons for the rolling wrinkles include the fluctuation of the rolling tension, the influence of the thickness and the width of the film, the influence of the flatness and the rigidity of the paper core and the like. The tension is the elastic extension of the film caused by the increment of the winding speed, the larger the tension is, the more uneven the distribution of the tension in the transverse direction is, the worse the flatness is, and the more easily wrinkles are generated; but the tension cannot be too small, otherwise the film roll is too loose to cause the cut string edges to affect the product quality. The thicker the film thickness, the less likely wrinkles will be generated. The larger the film width is, the more likely wrinkles are generated. Wrinkles are also generated due to serious unevenness at the local convex part of the film thickness when a vehicle is just started, raw materials are changed or specifications are changed.
Particularly, for the lithium battery diaphragm, the thickness is less than 10 μm, the rolling length exceeds 1000 m, and the tension fluctuation is easy to generate wrinkles, so that the yield of products is influenced.
Disclosure of Invention
The invention aims to provide a paper core capable of reducing wrinkling of a film and a paper core process thereof, aiming at overcoming the defect that the film is easy to wrinkle in the film rolling process in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a paper core is used for winding and unwinding a film and comprises a paper core bottom tube; the method is characterized in that: the outside of the paper core bottom tube is coated with an elastic sleeve with a round surface; the Shore hardness C of the elastic sleeve is 15-80 degrees. The paper core made of the composite material can balance the fluctuation of winding tension through the elastic deformation of the surface elastic sleeve while ensuring the rigidity of the paper core, so that the transverse stress of the film is more uniform, the surface of the film is smooth, and the film is not easy to wrinkle. As the conventional film rolling tension is about 30-360N according to different film thicknesses and materials, the tension fluctuation range is about 4-20N. The elastic sleeve with the Shore hardness C of 15-80 degrees is adopted, and the elastic deformation generated in the film rolling tension range can basically offset the fluctuation of tension, so that the tension fluctuation is more stable, the wrinkling of the surface of the rolled film is reduced, and the product yield is improved. In addition, because the paper core has elasticity, the later period change after the film is rolled is small, waves and bottom rolling wrinkles are not easy to form, and the yield of products is improved.
Preferably: the Shore hardness C of the elastic sleeve is 30-70 degrees.
It is further characterized in that: the inner diameter of the paper core bottom tube is 76-203mm, and the thickness of the paper core bottom tube is 3-25 mm; the thickness of the elastic sleeve is 0.5-10 mm. The stiffness requirements of the paper core are also high in order to reduce wrinkling of the film. The width of the film determines the length of the core base tube. When the inner diameter of the paper core bottom tube is 76-203mm, the thickness is 3-25 mm; the paper core bottom tube can be ensured to have better rigidity, the compressive strength can reach more than 1200N, and the influence of the paper core on the wrinkling of the film due to deflection deformation is reduced. Meanwhile, aiming at different thicknesses and different rolling tensions, the elastic deformation of the elastic sleeve of 0.5-10mm can better balance the tension fluctuation and reduce the wrinkling of the surface of the rolled film.
Further: when the thickness of the film is less than or equal to 16 mu m, the thickness of the elastic sleeve is less than or equal to 9 mm.
A way to set the thickness of the elastic sleeve according to the film thickness: when the thickness of the film is more than 10 mu m, the thickness of the elastic sleeve is less than 4 mm; when the thickness of the film is less than or equal to 10 mu m, the thickness of the elastic sleeve is more than or equal to 4 mm. The thickness of the film with the surface wrinkles reduced by the elastic sleeve is less than 30 μm, and the thickness of the lithium battery diaphragm is less than 10 μm. The thicker the film is, the larger the rolling tension that the film can bear, the smaller the influence of the non-uniformity of transverse stress on wrinkling is, and the smaller the deformation amount is, the tension fluctuation can be balanced, so as to achieve the purpose of reducing wrinkling. Therefore, when the thickness of the film is more than 10 μm, the thickness of the elastic sleeve is less than 4mm, which can meet the requirement. When the thickness of the film is less than or equal to 10 μm, the rolling tension is less than 40N, the fluctuation range of the tension is about +/-4N, and the transverse stress uniformity is poor. At the moment, the influence of tension fluctuation on film wrinkling is large, large elastic deformation is needed to balance the tension fluctuation, and the elastic sleeve with the thickness of more than or equal to 4mm can provide corresponding deformation to balance the tension fluctuation, so that the aim of reducing wrinkling is fulfilled.
Another way to set the hardness of the elastic sleeve according to its thickness is: when the thickness of the elastic sleeve is 0.5-3 mm; the Shore hardness C of the elastic sleeve is 15-60 degrees; when the thickness of the elastic sleeve is 3-5mm, the Shore hardness C of the elastic sleeve is 40-80 degrees; when the thickness of the elastic sleeve is larger than 5mm, the Shore hardness C of the elastic sleeve is 60-80 degrees. When the thickness of the film is basically determined, the effect of the elastic sleeve on reducing wrinkling of the film can be ensured by matching the thickness of the elastic sleeve with the hardness of the elastic sleeve.
Preferably: the elastic sleeve is made of an insulating material. The elastic sleeve is made of rubber or EVA materials. For application occasions such as lithium battery separators, the paper core also has insulation requirements, so that the rubber or EVA material can meet the insulation requirements while providing an elastic surface.
Preferably: an adhesive layer is arranged between the elastic sleeve and the paper core bottom tube. The adhesive layer is added between the elastic sleeve and the paper core bottom tube, so that the connection strength between the elastic sleeve and the paper core bottom tube can be increased, and the elastic sleeve is prevented from slipping when bearing large rolling tension.
The paper core bottom tube is of a cylinder structure formed by spirally winding a belt-shaped body; two ends of the paper core bottom tube are provided with more than two ends of the elastic sleeve, so that the outer sides of the end edges of the two ends of the paper core bottom tube are exposed; the material of adhesive linkage is EVA glues, the thickness of adhesive linkage is 0.5-1 mm. The paper core bottom tube of the cylindrical structure formed by spirally winding is convenient to process, the length of the paper core bottom tube is larger than that of the elastic sleeve, and the elastic sleeve is prevented from being deformed when the paper core is clamped. The thicker bonding layer can ensure the connection strength between the elastic sleeve and the paper core bottom tube.
According to the invention, the elastic sleeve with the Shore hardness C of 15-80 degrees is coated outside the paper core bottom tube, and the fluctuation of tension is offset through the elastic deformation of the elastic sleeve, so that the fluctuation of tension is more stable, the wrinkling of the surface of a rolled film is reduced, and the product yield is improved. According to the films with different thicknesses and different rolling tensions, the thickness of the elastic sleeve is set, the effect of reducing wrinkling on the surfaces of the films can be achieved with less elastic material, and the cost is saved. The paper core of the invention has simple and convenient processing operation, and the elastic sleeve pipe is tightly combined with the paper core bottom pipe.
Drawings
Fig. 1 is a schematic view of the overall structure of a paper core.
Fig. 2 is a schematic view of the layered structure of the paper core.
Fig. 3 is an axial view of the paper core.
Fig. 4 is a front view of the whole paper core.
Fig. 5 is a schematic winding view of a paper core bottom tube.
Detailed Description
As shown in fig. 1 to 5, a paper core for winding and unwinding a film comprises a paper core bottom tube 2, and an elastic sleeve 1 made of rubber or EVA with a smooth surface is coated outside the paper core bottom tube 2. The Shore hardness C of the elastic sleeve 1 is 15-80 degrees. The inner diameter of the paper core bottom tube 2 is 76-203mm, and the thickness is 3-25 mm; the thickness of the elastic sleeve 1 is 0.5-10 mm.
Preferably: the Shore hardness C of the elastic sleeve 1 is 30-70 degrees. When the thickness of the film is less than or equal to 16 mu m, the thickness of the elastic sleeve is less than or equal to 9 mm.
The reasons for the wrinkles in the rolled film include the fluctuation of the rolling tension, the influence of the thickness and width of the film, the influence of the flatness and rigidity of the paper core and the like. The tension is substantially the elastic elongation of the film due to the increase in take-up speed, and the greater the tension, the more uneven the distribution in the transverse direction, the worse the flatness, and the more likely wrinkles are generated. But the tension cannot be too small, otherwise the film roll is too loose to cause the cut string edges to affect the product quality. The thicker the film thickness, the less likely wrinkles will be generated. The larger the film width is, the more likely wrinkles are generated. The width of the film determines the length of the core base tube. The paper core bottom tube 2 in the invention can ensure better rigidity, the compressive strength can reach more than 3200N, and the influence of the paper core on the wrinkling of the film due to deflection deformation is reduced. The elastic deformation of the elastic sleeve 1 coated outside the paper core bottom tube 2 is used for balancing the fluctuation of winding tension, so that the tension fluctuation is more stable, the transverse stress of the film is more uniform, the surface of the film is smooth, and the film is not easy to wrinkle.
The thickness of the film with surface wrinkles reduced by the elastic sleeve 1 is less than 30 μm, and the thickness of the lithium battery diaphragm is less than 10 μm. For films with different thicknesses, the winding tension adopted in winding is different, and the tension fluctuation ranges are different. The elastic deformation requirement of the elastic sleeve 1 is matched with the requirement. When the thickness of the film is more than 10 μm, the thickness of the elastic sleeve is 0.5-4 mm. The thicker the film is, the larger the rolling tension that the film can bear, the smaller the influence of the non-uniformity of transverse stress on wrinkling is, and the smaller the deformation amount is, the tension fluctuation can be balanced, so as to achieve the purpose of reducing wrinkling. Therefore, the thickness of the elastic tube 1 is relatively small. When the thickness of the film is less than or equal to 10 μm, the thickness of the elastic sleeve 1 is more than or equal to 4 mm. When the thickness of the film is less than or equal to 10 μm, the rolling tension is less than 40N, the fluctuation range of the tension is about +/-4N, and the transverse stress uniformity is poor. At this time, the influence of the tension fluctuation on the wrinkling of the film is large, a large elastic deformation amount is needed to balance the tension fluctuation, and the elastic sleeve 1 with the thickness of more than or equal to 4mm can provide a corresponding deformation amount to balance the tension fluctuation, so that the aim of reducing wrinkling is achieved.
When the thickness of the film is basically determined, the effect of the elastic sleeve on reducing wrinkling of the film can be ensured by matching the thickness of the elastic sleeve with the hardness of the elastic sleeve. When the thickness of the elastic sleeve 1 is 0.5-3 mm; the Shore hardness C of the elastic sleeve 1 is 15-60 degrees; when the thickness of the elastic sleeve 1 is 3-5mm, the Shore hardness C of the elastic sleeve 1 is 40-80 degrees; when the thickness of the elastic sleeve 1 is more than 5mm, the Shore hardness C of the elastic sleeve 1 is 60-80 degrees.
The elastic sleeve 1 is made of insulating materials such as rubber or EVA materials. The winding device is suitable for application occasions such as winding of a lithium battery diaphragm, and can meet the requirement of insulation while providing an elastic surface.
As shown in fig. 1-5, the paper core bottom tube 2 is a cylindrical structure formed by spirally winding a strip-shaped body; two ends of the paper core bottom tube 2 are provided with two ends of the elastic sleeve 1, so that the outer sides of the end edges 2.1 at the two ends of the paper core bottom tube 2 are exposed. The paper core bottom tube 2 of the cylindrical structure formed by spirally winding is convenient to process, the length of the paper core bottom tube 2 is larger than that of the elastic sleeve 1, and the elastic sleeve 1 is prevented from being deformed when the paper core is clamped.
Preferably: as shown in fig. 2 and 3, an adhesive layer 3 is provided between the elastic sleeve 1 and the paper core bottom tube 2. The material of the adhesive layer 3 is EVA glue, and the thickness is 0.5-1 mm. Increase adhesive linkage 3 between elastic sleeve 1 and refill bottom tube 3, can increase the joint strength between elastic sleeve 1 and the refill bottom tube 2, when preventing to bear great rolling tension, elastic sleeve 1 skids.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A paper core is used for winding and unwinding a film and comprises a paper core bottom tube; the method is characterized in that: the outside of the paper core bottom tube is coated with an elastic sleeve with a round surface; the Shore hardness C of the elastic sleeve is 15-80 degrees; the inner diameter of the paper core bottom tube is 76-203mm, and the thickness of the paper core bottom tube is 3-25 mm; the thickness of the elastic sleeve is 0.5-10 mm; when the thickness of the film is less than or equal to 16 mu m, the thickness of the elastic sleeve is less than or equal to 9 mm; when the thickness of the film is more than 10 mu m and more than or equal to 16 mu m, the thickness of the elastic sleeve is less than 4 mm; when the thickness of the film is less than or equal to 10 mu m, the thickness of the elastic sleeve is more than or equal to 9mm and more than or equal to 4 mm.
2. The paper core of claim 1, wherein: the Shore hardness C of the elastic sleeve is 30-70 degrees.
3. The paper core of claim 1, wherein: when the thickness of the elastic sleeve is 0.5-3 mm; the Shore hardness C of the elastic sleeve is 15-60 degrees; when the thickness of the elastic sleeve is 3-5mm, the Shore hardness C of the elastic sleeve is 40-80 degrees; when the thickness of the elastic sleeve is larger than 5mm, the Shore hardness C of the elastic sleeve is 60-80 degrees.
4. A paper core as claimed in claim 1 or 2, characterized in that: the elastic sleeve is made of an insulating material including rubber or EVA.
5. A paper core as claimed in claim 1 or 2, characterized in that: an adhesive layer is arranged between the elastic sleeve and the paper core bottom tube.
6. The paper core of claim 5, wherein: the paper core bottom tube is of a cylinder structure formed by spirally winding a belt-shaped body; two ends of the paper core bottom tube are provided with more than two ends of the elastic sleeve, so that the outer sides of the end edges of the two ends of the paper core bottom tube are exposed; the material of adhesive linkage is EVA glues, the thickness of adhesive linkage is 0.1-1 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010267485.6A CN111410097B (en) | 2020-04-08 | 2020-04-08 | Paper core |
| PCT/CN2020/095601 WO2021203548A1 (en) | 2020-04-08 | 2020-06-11 | Paper core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010267485.6A CN111410097B (en) | 2020-04-08 | 2020-04-08 | Paper core |
Publications (2)
| Publication Number | Publication Date |
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| CN111410097A CN111410097A (en) | 2020-07-14 |
| CN111410097B true CN111410097B (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010267485.6A Active CN111410097B (en) | 2020-04-08 | 2020-04-08 | Paper core |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111410097B (en) |
| WO (1) | WO2021203548A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410097B (en) * | 2020-04-08 | 2022-01-28 | 无锡泰极纸业有限公司 | Paper core |
| CN113460806A (en) * | 2021-05-31 | 2021-10-01 | 康辉新材料科技有限公司 | Soft paper core for winding film and method for solving problem of core impression of finished roll |
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| JP2005040963A (en) * | 2003-07-22 | 2005-02-17 | Toray Ind Inc | Winding core |
| JP2013075751A (en) * | 2011-09-30 | 2013-04-25 | Teijin Dupont Films Japan Ltd | Winding body |
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2020
- 2020-04-08 CN CN202010267485.6A patent/CN111410097B/en active Active
- 2020-06-11 WO PCT/CN2020/095601 patent/WO2021203548A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021203548A1 (en) | 2021-10-14 |
| CN111410097A (en) | 2020-07-14 |
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