US20140001306A1 - Film winding core, and wound film body using same - Google Patents

Film winding core, and wound film body using same Download PDF

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Publication number
US20140001306A1
US20140001306A1 US14/004,366 US201214004366A US2014001306A1 US 20140001306 A1 US20140001306 A1 US 20140001306A1 US 201214004366 A US201214004366 A US 201214004366A US 2014001306 A1 US2014001306 A1 US 2014001306A1
Authority
US
United States
Prior art keywords
film
core
winding core
supporting portions
core body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/004,366
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English (en)
Inventor
Shunsuke Noumi
Shunichirou Sayanagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Assigned to NITTO DENKO CORPORATION reassignment NITTO DENKO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAYANAGI, Shunichirou, NOUMI, SHUNSUKE
Publication of US20140001306A1 publication Critical patent/US20140001306A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
    • 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
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/175—Plastic
    • B65H2701/1752—Polymer film
    • 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
    • B65H2701/30—Handled filamentary material
    • B65H2701/37—Tapes
    • 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
    • B65H2701/514—Elastic elements

Definitions

  • the present invention relates to a film winding core and a wound film body using the core.
  • a long film is produced by a known method such as extrusion molding and wound on a cylindrical core for storage and shipment.
  • the film thus wound on the cylindrical core is distorted (deformed) during storage, which may cause difficulties in unwinding the film.
  • Patent Literature 1 points out such a problem.
  • Patent Literature 1 describes a core configured to prevent the distortion of a belt-like article resulting from the contraction of the wound article. Specifically, after the belt-like article is wound on the core in close contact with the outer periphery of the core, the core is contracted in the radial direction thereof. Then, after the core is expanded in the radial direction to increase the contact between the outer periphery of the core and the belt-like article, the belt-like article is unwound from the core.
  • Patent Literature 1 JP 2009-113877 A (FIG. 5 to FIG. 10)
  • Patent Literature 1 Since the core described in Patent Literature 1 has a relatively complex mechanism, it is not suitable for sale to customers in the form of a roll of film wound on the core.
  • the present invention provides a film winding core on which a long film is to be wound.
  • This film winding core includes: a core body having a tubular shape; and a plurality of film supporting portions provided around the core body.
  • the film supporting portions protrude from an outer peripheral surface of the core body respectively at a plurality of positions in a rotational direction of the core body so that the film is supported away from the outer peripheral surface of the core body, and each of the film supporting portions is made of a material that can be deformed when the film is wound on the film winding core.
  • the present invention provides a wound film body including: the film winding core of the present invention; and a film wound on the film winding core of the present invention.
  • a film is distorted based on the following mechanism.
  • a long film has not a little thickness unevenness (variations in the thickness) in a width direction.
  • a thick portion of the film expands outward more than a thin portion thereof. Then, tension is concentrated on the thick portion, and the thick portion is stretched in the longitudinal direction.
  • sufficient tension is not applied to the thin portion, and so-called “gapping” occurs in some cases. “Gapping” refers to the formation of a gap between the inner layer and the outer layer of the wound film.
  • the plurality of film supporting portions are provided around the core body. Since the film supporting portions protrude from the outer peripheral surface of the core body, the film is supported by the film supporting portions. Therefore, it is possible to prevent the film from coming into close contact with the core body between two film supporting portions that are adjacent to each other in the rotational direction. Thus, it is possible to prevent as much as possible the distortion from being memorized in the film.
  • the film supporting portions are made of a material that can be deformed when the film is wound. The deformation of the film supporting portions can alleviate or offset the influence of the uneven thickness of the film.
  • the distortion caused by the uneven thickness can be suppressed. Therefore, the bend or slack in the film can be prevented during unwinding of the film. As a result, stable feeding of the film can be achieved during unwinding thereof, and thus the incidence of manufacturing defects (feeding errors) can be reduced significantly.
  • the yield of film-related products and the availability of the film are also improved.
  • FIG. 1 is a perspective view of a film winding core according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the core shown in FIG. 1 , taken along the line II-II.
  • FIG. 3 is a cross-sectional view of a wound film body using the core shown in FIG. 1 .
  • FIG. 4 is a schematic view showing a preferable protrusion height of film supporting portions.
  • FIG. 5A is a cross-sectional view of a core according to a modification.
  • FIG. 5B is a cross-sectional view of a core according to another modification.
  • FIG. 5C is a cross-sectional view of a core according to still another modification.
  • the film winding core is simply referred to as a “core”.
  • a core 10 is composed of a core body 12 , a pair of bearing portions 16 , and a plurality of film supporting portions 14 .
  • a wound film body 100 includes the core 10 and a long film 18 wound on the core 10 .
  • the core 10 can be rotated about a rotational axis O.
  • the rotational axis O is an axis passing through the center of the core body 12 .
  • the core body 12 has a tubular shape.
  • the core body 12 can be formed of a tubular member with both ends open.
  • the cross-sectional shape of the core body 12 is not particularly limited. The shape may be a circle as in the present embodiment, or it may be a polygon.
  • the film 18 is supported directly by the film supporting portions 14 . Furthermore, as described later, the influence of the uneven thickness of the film 18 is cancelled out by the film supporting portions 14 . Therefore, a high dimensional accuracy is not required for the core body 12 .
  • the material of the core body 12 is not particularly limited.
  • the core body 12 can be made of resin, metal, ceramic, glass, or a combination of these. Desirably, the core body 12 is not easily deformed when the film 18 is wound on the core 10 .
  • the core body 12 can be obtained by molding a thermoplastic resin, such as polycarbonate, polypropylene, polyethylene, acrylonitrile-butadiene-styrene copolymer, polyester (for example, polyethylene terephthalate, polyethylene naphthalate or the like), polystyrene, or polyvinyl chloride, by a known method, for example, by injection molding.
  • the film supporting portions 14 are portions provided around the core body 12 , and protrude radially outwardly from the outer peripheral surface 12 p of the core body 12 respectively at a plurality of positions in the rotational direction of the core body 12 so that the film 18 is supported away from the outer peripheral surface 12 p of the core body 12 . According to the film supporting portions 14 , the close contact between the film 18 and the core body 12 can be avoided between the film supporting portions 14 that are adjacent to each other in the rotational direction. Thus, it is possible to prevent the distortion from being memorized in the film 18 .
  • the film supporting portions 14 are made of a material that can be deformed when the film 18 is wound on the core 10 .
  • the film supporting portions 14 are made of an elastically deformable material.
  • the film supporting portions 14 are elastically deformable, sufficient friction can be generated between the film supporting portions 14 and the film 18 . Therefore, free rotation of the core 10 can be prevented when the film 18 is wound and unwound.
  • the film supporting portions 14 have appropriate elastic and cushioning properties, the influence of the uneven thickness of the film 18 can be alleviated or offset effectively.
  • At least one material selected from the group consisting of sponge, rubber, and foam can be used as a material for the film supporting portions 14 .
  • These materials are all inexpensively available and easy to process. These materials also allow sufficient friction to act between the film 18 and the film supporting portions 14 .
  • urethane foam has the above-mentioned properties in a well-balanced manner, it is recommended as the material for the film supporting portions 14 .
  • Materials having appropriate impact resilience are, for example, natural rubber, nitrile rubber, silicone rubber, and foams of these. Besides these materials, polyethylene, EVA (ethylene-vinylacetate copolymer), EPDM (ethylene-propylene-diene rubber), fluorine rubber, and foams of these also can be used.
  • the film supporting portions 14 can be fixed to the core body 12 by a known method such as bonding or welding.
  • the entire film supporting portion 14 does not have to be made of any one of the above materials. Only a portion of the film supporting portion 14 , for example, a portion in contact with the film 18 may be made of any one of the above materials.
  • the film supporting portions 14 are arranged at regular intervals (regular angular intervals) in the rotational direction of the core body 12 .
  • the film supporting portions 14 arranged at regular intervals in the rotational direction improves the uniformity of load on the film 18 in the longitudinal direction of the film 18 . This has an advantage in suppressing the distortion.
  • an imaginary polygon PL having a minimum area required to surround all the film supporting portions 14 in a cross-section perpendicular to the rotational axis O is defined.
  • the positions of the film supporting portions 14 , the number of the film supporting portions 14 , the height h of the film supporting portions 14 protruding from the outer peripheral surface 12 p of the core body 12 can be adjusted so that the core body 12 fits within this polygon PL.
  • the film 18 can be prevented from being strongly pressed against the core body 12 .
  • a core 10 A shown in FIG. 5A has the film supporting portions 14 provided at regular intervals at eight positions thereon in the rotational direction.
  • the film supporting portions 14 are provided so as to extend from one side of the core body 12 to the other side thereof.
  • the longitudinal direction of the film supporting portion 14 is parallel to the rotational axis O of the core 10 , and is perpendicular to the longitudinal direction of the film 18 . This configuration allows a uniform supporting force to be applied to the film 18 in the width direction of the film 18 .
  • the film supporting portion 14 has a semicircular column shape. This shape allows the film supporting portion 14 to have a reasonably large surface area for supporting the film 18 . This is preferred from the viewpoint of preventing a local deformation of the film 18 .
  • a core 10 B shown in FIG. 5B is provided with film supporting portions 24 having a hollow semicircular column shape.
  • a core 10 C shown in FIG. 5C is provided with film supporting portions 34 having a rectangular column shape.
  • These film supporting portions 24 and 34 also can be suitably employed because they perform the same action as the film supporting portions 14 .
  • the film supporting portions 24 having a hollow structure as shown in FIG. 5B can be easily elastically deformed, the effect of alleviating or offsetting the influence of the uneven thickness of the film 18 can be expected sufficiently.
  • the outer peripheral surface of the film supporting portion 14 or 24 has a smaller curvature than that of the outer peripheral surface 12 p of the core body 12 .
  • the bearing portions 16 are portions which are mounted on both sides of the core body 12 and into which a shaft (not shown) used to rotate the core 10 is to be inserted.
  • the core 10 can be rotated smoothly by the bearing portions 16 .
  • the bearing portions 16 have the same contour as the core body 12 . However, the bearing portions 16 have a larger diameter than that of the core body 12 , which means that the bearing portions 16 may extend beyond the core body 12 .
  • the bearing portions 16 are each constituted by a disc-shaped flange having a bearing hole 16 h.
  • the bearing portions 16 may be integrated with the core body 12 , or may be detachable from the core body 12 .
  • the bearing portions 16 can be integrated with the core body 12 by a known method such as welding or bonding.
  • fitting structures can be provided between the core body 12 and the bearing portions 16 .
  • this one pair of bearing portions 16 can be shared by many cores 10 . Therefore, the cost of the core 10 can be reduced.
  • the weight of the wound film body 100 can be reduced by removing the bearing portions 16 therefrom, a reduction in the transportation cost for delivery to a customer also can be expected.
  • the bearing portions 16 are not essential components, of course.
  • the shaft can be inserted directly into the core body 12 so as to rotate the core 10 .
  • the “bearing portion 16 ” may not have a function of supporting the shaft, to be exact.
  • the term “bearing portion” is used in the sense of “a portion having a through-hole (bearing hole 16 h ) for mounting the core 10 on the shaft”.
  • the core 10 of the present embodiment does not have a mechanically movable portion, it can be produced at low cost.
  • the wound film body 100 has a polygonal shape, typically a regular polygonal shape, as a whole, in the cross-section perpendicular to the rotational axis O (or in plan view).
  • gaps SH are formed between the outer peripheral surface 12 p of the core body 12 and the film 18 .
  • Portions of the film 18 wound on the core 10 that are not supported by the film supporting portions 14 are slightly slackened toward the core body 12 . In this state, the film 18 may be completely separated from the core body 12 or may be in contact with the outer peripheral surface 12 p unless the effect of suppressing the distortion decreases significantly.
  • the material, structure and dimensions of the film 18 to be wound on the core 10 are not particularly limited.
  • the use of the core 10 of the present embodiment for winding a film having thickness unevenness inherent thereto is very effective in suppressing the distortion.
  • a film produced using an extruder equipped with a T-die has an approximately uniform width-direction thickness distribution in any portion of the film measured in the longitudinal direction.
  • a thickness difference of about 1 ⁇ m between one end of the film and the other end thereof in the width direction it is assumed that there is a thickness difference of about 1 ⁇ m between one end of the film and the other end thereof in the width direction.
  • a diameter difference of about 2 mm is created between one end of the resulting wound film body and the other end thereof.
  • Even such slight thickness unevenness increases the diameter difference in the resulting wound film body as the number of winding turns increases.
  • the distortion due to the uneven thickness is memorized in the film, which increases the probability of unwinding defects (typically feeding errors).
  • the core 10 of the present embodiment is particularly effective in winding a film which is hard to remove distortion once the distortion is memorized in the film.
  • a film has flexibility, and typically it has a thickness of micrometer order (for example, 2 to 100 ⁇ m).
  • the film having an uneven thickness itself has a great influence on the quality of a final product, for example, a secondary battery.
  • a film has thickness variations of about ⁇ 1 ⁇ m from a target thickness of 20 ⁇ m, such variations in the thickness of the film are unlikely to have an influence on the quality of the final product as long as the other properties of the film meet the standards.
  • the film has a completely uniform thickness, it is expected that unwinding defects caused by thickness unevenness rarely occur.
  • it is possible to prevent defects caused by the uneven thickness of the film by improving the core, instead of improving the film itself.
  • the film produced using an extruder equipped with a T-die is, for example, a porous resin membrane.
  • the porous resin membrane include porous membranes made of polyolefin, fluorine resin, polyurethane, polyamide, polyester, polyimide, polyamide-imide, epoxy, and the like.
  • polyolefin include polyethylene and polypropylene.
  • fluorine resin include polytetrafluoroethylene.
  • a porous resin membrane made of polyimide, polyamide-imide or epoxy may be a thermosetting membrane.
  • the film 18 may or may not have an adhesive layer.
  • a film having no adhesive layer is more suitable for use with the core 10 of the present embodiment.
  • a film having no adhesive layer more specifically, a film having slidable front and back surfaces, is often unwound at a low tension and a high speed for use. The higher the unwinding speed, the higher the probability of a feeding error. Therefore, it is particularly recommended to use the core 10 of the present embodiment as a core for a film having no adhesive layer.

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  • Storage Of Web-Like Or Filamentary Materials (AREA)
US14/004,366 2011-03-11 2012-03-09 Film winding core, and wound film body using same Abandoned US20140001306A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011054159A JP2012188252A (ja) 2011-03-11 2011-03-11 フィルム巻取用巻芯及びそれを用いたフィルム巻回体
JP2011-054159 2011-03-11
PCT/JP2012/001670 WO2012124305A1 (ja) 2011-03-11 2012-03-09 フィルム巻取用巻芯及びそれを用いたフィルム巻回体

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US20140001306A1 true US20140001306A1 (en) 2014-01-02

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US14/004,366 Abandoned US20140001306A1 (en) 2011-03-11 2012-03-09 Film winding core, and wound film body using same

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US (1) US20140001306A1 (zh)
EP (1) EP2684828A4 (zh)
JP (1) JP2012188252A (zh)
KR (1) KR20140012711A (zh)
CN (1) CN103415456A (zh)
WO (1) WO2012124305A1 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9346652B2 (en) 2011-03-11 2016-05-24 Nitto Denko Corporation Film winding core, and wound film body using same
CN106477369A (zh) * 2016-11-30 2017-03-08 江门沙龙实业有限公司 一种烫金机的薄膜收卷装置
US20170165923A1 (en) * 2014-07-16 2017-06-15 Vestas Wind Systems A/S A roll of structural material, it's method of making and a method of making a wind turbine blade
US10258204B2 (en) * 2015-12-28 2019-04-16 Russell J. Gerhold Paper product center sponge tube and method
WO2022081333A1 (en) * 2020-10-13 2022-04-21 Milwaukee Electric Tool Corporation Fish tape tool
US11511963B2 (en) 2018-03-23 2022-11-29 Milwaukee Electric Tool Corporation Fish tape assembly

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KR101461846B1 (ko) 2014-03-04 2014-11-13 송해용 필름 권취 장치
CN104876069A (zh) * 2015-04-14 2015-09-02 苏州爱立方服饰有限公司 一种纺织品卷取辊
TWI767131B (zh) * 2018-07-18 2022-06-11 日商美克司股份有限公司 捆束用帶
JP7325706B2 (ja) * 2018-07-18 2023-08-15 マックス株式会社 結束用テープ、結束方法、テープ巻き付け体及びリール
CN112850370B (zh) * 2020-12-31 2023-09-22 上海恩捷新材料科技有限公司 一种锂电池隔膜收卷装置及工艺

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US20070275183A1 (en) * 2006-04-13 2007-11-29 Fujifilm Corporation Transparent thermoplastic film and a method of producing the same

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US2278380A (en) * 1937-05-28 1942-03-31 American Bemberg Corp Reel
US2605978A (en) * 1946-06-01 1952-08-05 Allard Pierre Jean Ma Theodore Drum for winding cable
US4657202A (en) * 1986-03-24 1987-04-14 Sauber Charles J Tension take-up system for drums and the like
US5915062A (en) * 1997-07-01 1999-06-22 Lucent Technologies Inc. Low loss optical fiber reel
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9346652B2 (en) 2011-03-11 2016-05-24 Nitto Denko Corporation Film winding core, and wound film body using same
US20170165923A1 (en) * 2014-07-16 2017-06-15 Vestas Wind Systems A/S A roll of structural material, it's method of making and a method of making a wind turbine blade
US10538039B2 (en) * 2014-07-16 2020-01-21 Vestas Wind Systems A/S Roll of structural material, it's method of making and a method of making a wind turbine blade
US10258204B2 (en) * 2015-12-28 2019-04-16 Russell J. Gerhold Paper product center sponge tube and method
CN106477369A (zh) * 2016-11-30 2017-03-08 江门沙龙实业有限公司 一种烫金机的薄膜收卷装置
US11511963B2 (en) 2018-03-23 2022-11-29 Milwaukee Electric Tool Corporation Fish tape assembly
US11787659B2 (en) 2018-03-23 2023-10-17 Milwaukee Electric Tool Corporation Fish tape assembly
WO2022081333A1 (en) * 2020-10-13 2022-04-21 Milwaukee Electric Tool Corporation Fish tape tool

Also Published As

Publication number Publication date
JP2012188252A (ja) 2012-10-04
WO2012124305A1 (ja) 2012-09-20
CN103415456A (zh) 2013-11-27
EP2684828A4 (en) 2014-09-10
EP2684828A1 (en) 2014-01-15
KR20140012711A (ko) 2014-02-03

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Owner name: NITTO DENKO CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NOUMI, SHUNSUKE;SAYANAGI, SHUNICHIROU;SIGNING DATES FROM 20130821 TO 20130823;REEL/FRAME:031183/0978

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION