EP0444632A1 - Web-winding core - Google Patents

Web-winding core Download PDF

Info

Publication number
EP0444632A1
EP0444632A1 EP91102924A EP91102924A EP0444632A1 EP 0444632 A1 EP0444632 A1 EP 0444632A1 EP 91102924 A EP91102924 A EP 91102924A EP 91102924 A EP91102924 A EP 91102924A EP 0444632 A1 EP0444632 A1 EP 0444632A1
Authority
EP
European Patent Office
Prior art keywords
web
winding core
winding
shape
leading edge
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.)
Withdrawn
Application number
EP91102924A
Other languages
German (de)
English (en)
French (fr)
Inventor
Junichiro C/O Fuji Photo Film Co. Ltd. Yoshida
Akira C/O Fuji Photo Film Co. Ltd. Ohinata
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0444632A1 publication Critical patent/EP0444632A1/en
Withdrawn legal-status Critical Current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
    • B65H75/18—Constructional details
    • B65H75/28—Arrangements for positively securing ends of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/41419—Starting winding process
    • B65H2301/41422—Starting winding process involving mechanical means
    • B65H2301/414225—Starting winding process involving mechanical means fixed to shaft or mandrel, e.g. clamping or pinching leading edge to shaft or mandrel

Definitions

  • This invention relates to a web-winding core adapted to be attached to a winding device when applying a coating or a surface treatment to a surface of a long flexible substrate (hereinafter referred to as "web") such as a plastic film and a metal sheet.
  • web a long flexible substrate
  • Products formed by applying a coating or a surface treatment to a web have been extensively used in the industries. Many of these products use an expensive material such as a photosensitive material. Therefore, it is desired to enhance the yield of the product as much as possible.
  • One drawback which lowers the yield of such product is that the shape of the leading edge of the web wound on the web-winding core is transferred to those portions of the web disposed in overlapping relation to the leading edge by the web-winding pressure. More specifically, with respect to the product wound on the web-winding core, the web is bonded to the winding core by an adhesive, an electrostatic charge, or other means, and then the web is sequentially wound in overlapping relation to the leading edge of the web having such a shape as an obliquely linear shape, an arcuate shape, a serrated shape and a triangular shape. Therefore, a step corresponding in thickness to the web is formed between the leading edge of the web and the surface of the winding core.
  • a shape analogous to the shape of the web leading edge is formed on those portions of the sequentially-wound web disposed at the above step.
  • a coating layer or a surface treatment layer on the surface of the web is plastically deformed at this portion, and in the case of a photosensitive material, this causes a pressure fogging or the like, thus producing defective products, which lowers the yield.
  • the elastic function of the rubber is lowered, so that the cushioning effect can not be obtained, and besides the rubber is separated into granular form and may possibly be introduced into the product.
  • the present invention has been made in view of the above problems, and an object of the invention is to stably prevent the transfer, thereby enhancing the yield of the product.
  • the above object has been achieved by:
  • the leading edge of the web may have any shape such as conventionally-used shapes, such as an obliquely linear shape, an arcuate shape, a serrated shape and a triangular shape; however, a simple shape such as the obliquely linear shape and the triangular shape is preferred in view of the fact that the recessed surface and the leading edge portion of the web are mated together.
  • the most deep portion of the recessed surface with which the leading edge portion of the web is contacted is in the range of between a value 5% smaller than the web thickness and a value 5% larger than the web thickness.
  • the surface of the winding core has the recessed surface which has the shape analogous to the shape of the leading edge portion of the web and is analogous in thickness to the web.
  • This recessed surface is formed by cutting the surface of the winding core or the surface of a resin layer formed on the surface of the winding core, using a numerically-controlled milling machine.
  • Metal preferably, light metal such as aluminum), FRP or the like are usually used as a material for the winding core.
  • the depth of the above recessed surface is the maximum at its portion of contact with the leading edge portion of the web, and is decreasing progressively in the direction of winding of the web.
  • the depth of the recessed surface should be decreasing progressively in the direction of winding of the web, though the transfer, in some cases, may be eliminated merely by putting the web leading edge portion in the recessed surface of the winding web.
  • the progressively-decreasing region of the winding core should be not less than 5% of the peripheral length of the winding core.
  • examples of the web used in the present invention include a plastics film, resin-coated paper, an aluminum web, and synthetic paper.
  • examples of the material of the plastics film include polyolefin such as polyethylene and polypropylene, a vinyl polymer such as polyvinyl acetate, polyvinyl chloride and polystyrene, a polyamide such as 6,6-nylon and 6-nylon, a polyester such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polycarbonate, and cellulose acetate such as cellulose triacetate and cellulose diacetate.
  • a representative example of the resin used for the resin-coated paper is polyolefin such as polyethylene, but the resin is not always limited to such resin.
  • a surface 3 of a winding core 2 on which a web is adapted to be wound has a recessed surface which has a shape analogous to the leading edge configuration 4 (extending between A to B2) of the web 1 and has a thickness analogous to the thickness tw of the web.
  • the depth of the recessed surface of this shape is the maximum t ⁇ (1 ⁇ 0.05)tw at its portion of contact with the triangular leading edge portion (A-B1-B2) of the web, and is decreasing progressively in the direction of winding of the web, from B toward C, so that the recession disappears at the point C.
  • the length between B and C should be not less than 5% of the circumference of the web-winding core.
  • a 20 ⁇ m-thick coating of a photographic emulsion was applied to a laminate paper sheet with a thickness of 230 ⁇ m to prepare a web.
  • a web had a leading edge whose shape was obliquely linear at an angle of 60°, as shown in Fig. 2.
  • a nylon resin was flame-sprayed onto a surface of a cylinder of stainless steel (SUS304) with a diameter of 300 mm to form a resin layer with a thickness of about 5mm thereon, thereby preparing a web-winding core.
  • a recessed surface which had a shape analogous to the shape of the leading edge portion of the web and was analogous in thickness to the web, was formed by cutting, the deep portion of the recessed surface being 240 ⁇ m.
  • the web was wound on each of the winding core of the present invention and a conventional cylindrical winding core, while coating a photosensitive material to the web, and the two webs wound respectively on the two winding cores were compared with each other with respect to the condition of transfer at the web leading edge portion. Results are shown in Table 1.
  • the size of the winding core is kept to the same level as the conventional core, and there is no problem with the winding tension, and a deterioration of the performance due to aging is not encountered, and the transfer of the web leading edge shape is prevented, thus greatly enhancing the quality and yield of the product.

Landscapes

  • Storage Of Web-Like Or Filamentary Materials (AREA)
EP91102924A 1990-02-28 1991-02-27 Web-winding core Withdrawn EP0444632A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18851/90U 1990-02-28
JP1885190U JPH03110077U (ja) 1990-02-28 1990-02-28

Publications (1)

Publication Number Publication Date
EP0444632A1 true EP0444632A1 (en) 1991-09-04

Family

ID=11983055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102924A Withdrawn EP0444632A1 (en) 1990-02-28 1991-02-27 Web-winding core

Country Status (2)

Country Link
EP (1) EP0444632A1 (ja)
JP (1) JPH03110077U (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7913943B1 (en) * 2005-11-10 2011-03-29 Oracle America, Inc. Tape drive

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1453686A (fr) * 1965-05-09 1966-06-03 Beillard Ets Tube-support destiné à l'enroulement en développement spiral régulier, sans surépaisseur, des tissus et tous articles en bandes
US4697757A (en) * 1986-03-10 1987-10-06 Okashiro Sangyo Kabushiki Kaisha Sleeve to be attached to the reel on a winding or rewinding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1453686A (fr) * 1965-05-09 1966-06-03 Beillard Ets Tube-support destiné à l'enroulement en développement spiral régulier, sans surépaisseur, des tissus et tous articles en bandes
US4697757A (en) * 1986-03-10 1987-10-06 Okashiro Sangyo Kabushiki Kaisha Sleeve to be attached to the reel on a winding or rewinding machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7913943B1 (en) * 2005-11-10 2011-03-29 Oracle America, Inc. Tape drive
US8220734B2 (en) 2005-11-10 2012-07-17 Oracle America, Inc. Tape drive

Also Published As

Publication number Publication date
JPH03110077U (ja) 1991-11-12

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Designated state(s): DE NL

17P Request for examination filed

Effective date: 19920304

17Q First examination report despatched

Effective date: 19930107

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18D Application deemed to be withdrawn

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