EP3851402A1 - Metallspule - Google Patents

Metallspule Download PDF

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Publication number
EP3851402A1
EP3851402A1 EP20152346.1A EP20152346A EP3851402A1 EP 3851402 A1 EP3851402 A1 EP 3851402A1 EP 20152346 A EP20152346 A EP 20152346A EP 3851402 A1 EP3851402 A1 EP 3851402A1
Authority
EP
European Patent Office
Prior art keywords
spool
attraction
magnetic
flanges
zone
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.)
Granted
Application number
EP20152346.1A
Other languages
English (en)
French (fr)
Other versions
EP3851402B1 (de
Inventor
Bram Verkens
Stijn De Pauw
Johan DESLOOVERE
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Priority to RS20240461A priority Critical patent/RS65439B1/sr
Priority to FIEP20152346.1T priority patent/FI3851402T3/fi
Priority to EP20152346.1A priority patent/EP3851402B1/de
Publication of EP3851402A1 publication Critical patent/EP3851402A1/de
Application granted granted Critical
Publication of EP3851402B1 publication Critical patent/EP3851402B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65H75/14—Kinds or types of circular or polygonal cross-section with two end flanges
    • 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
    • B65H75/30—Arrangements to facilitate driving or braking
    • 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
    • B65H2701/36—Wires
    • 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
    • B65H2701/5114—Metal sheets

Definitions

  • the invention relates to a metal spool for use with a magnetic spool holder as present on creels for unwinding arrays of spools. Such creels are particularly used in rubber sheathing installations for making tires.
  • the metal spool is suitable for winding steel wire, in particular steel cord or even more preferred steel monofilament.
  • Tire cords are either made of organic fibres or from steel, the latter being generally referred to as steel cords.
  • steel cords consists of one single filament called monofilament or from an assembly of different filaments called multi-filament steel cords.
  • These steel cords are encased in parallel between rubber sheets by unwinding them from a multitude of spools mounted on a pay-off creel. Between 150 and 1500 spools are unwound in one single operation from a creel. The spools are mounted and demounted from the creel in an automatic, semi-automatic or manual operation possibly supported by lifting equipment to reduce human effort.
  • the industry standard spool within the tire industry is called BS40 and BS60 (for net weights up to 40 pounds) or BS80 (for weights up to 80 pounds). 'An example is shown in USD504806S. Literally millions of BS spools are circulating between tire factories and steel cord plants.
  • a monofilament of between 0.30 to 0.40 mm in combination with an increased tensile strength of 'super tensile' level ('ST' a tensile strength larger than 3400 MPa on a 0.35 mm filament) or 'ultra tensile' level ('UT' a tensile strength larger than 3700 MPa on a 0.35 mm filament) is capable of replacing currently popular multi-filament steel cords such as 2x0.25, 2 ⁇ 0.30, 2+2 ⁇ 0.22, 3 ⁇ 0.25 or similar constructions.
  • a monofilament brings advantages in terms of reduced rolling resistance and reduced tire weight.
  • the spool offers an increased strength while remaining acceptable in weight.
  • the spool is - in empty state - easy to remove from the magnetic holder on a creel. Furthermore it offers an increased life cycle, an improved unwinding capability and a better straightness upon unreeling.
  • a spool as per the features of claim 1 is described.
  • the spool is intended for use with a magnetic spool holder.
  • the spool comprises a core of cylindrical shape and two flanges that are welded to the ends of the core. At least the flanges are made of ferromagnetic metal sheet.
  • the flanges are provided with a bore hole for insertion of the spindle of the creel.
  • a tube coaxial to the core connects the bore holes of both flanges to ease mounting of the spool on the spindle but this is not essential to the invention.
  • Around the bore there is an annular attraction zone centred at the bore hole. This attraction zone will be attracted by the magnet of the magnetic spool holder when the spool is mounted on the magnet spindle.
  • the magnet of the spindles itself is provided in a circular housing.
  • the magnet is mounted flush with or preferably slightly below the rim of the housing.
  • a gap forms between the magnet and the spool flange, while the spool flange rests on the rim of the housing. This to prevent damage to the magnet and/or to reduce the magnetic attraction of the magnet holder. This gap is fixed and cannot easily be adjusted.
  • the current creels provided with magnet holders are therefore specifically adapted to the current standardised BS40, BS60 and BS80 spools.
  • Magnet spindles of creel installations are thus standardised parts of which the outer diameter of the magnet housing have an outer diameter of 75 to 110 mm, for example 100 mm.
  • the spindle itself has a diameter of between 30 to 35 mm for example 32.5 mm or of between 15 to 19 mm for example 17 mm.
  • the attraction zone extends from the outer edge of the bore hole to just a few millimetre outside where the rim of the magnet housing touches the flange.
  • the attraction zone thus extends to a circle with radius of between 35 and 60 mm, for example 55 mm co-centred to the bore hole.
  • the spool As the steel cord on the spool must be unwound from the creel with a constant pay-off tension, the spool must not rotate freely on the spindle.
  • the magnetic spool holder is braked in a controlled way to adjust the tension of unwinding of the steel cord. The magnetic attraction should therefore generate enough friction that the spool does not rotate freely on the spindle.
  • 'ferromagnetic metal sheet is meant any metal sheet that can be attracted by a magnet. Most preferred are steel sheets that contain sufficient iron in order to be attracted. Typical steel sheets are according EN 10149-2 'Hot rolled steels for cold forming'.
  • the thickness and the yield strength of the ferromagnetic metal sheet is important because it determines the strength of the spool. As such the thickness of the steel sheet of prior art spool flanges is 1.2 mm with a yield strength of less than 280 MPa. This is one of the reasons why the prior art spools are not sufficiently strong to hold monofilament steel cord.
  • the ferromagnetic metal sheet of the flanges of the metal spool according the invention must therefore have a thickness of above 1.2 mm and below 3.0 mm, more preferably between 1.5 mm and 2.0 mm or best between 1.5 mm and 1.8 mm and/or in combination with a yield strength that is larger than 280 MPa, more preferably larger than 300 MPa, e.g. larger than 320 MPa. Yield strength is measured according ISO 6892-1(2019).
  • the thickness of the metal sheet influences the magnetic attraction force: using thicker ferromagnetic metal sheet results in a higher attraction force making it difficult to pull the spool from the spindle which is a problem for the creel operator.
  • the force needed to pull an empty spool from the magnetic spool holder should remain between 150 and 200 newton. Higher forces are too demanding to the operator, lower forces may lead to slippage of the spool.
  • Another method by which the strength of the flanges can be improved is by providing them with multiple debossed areas of plastically compressed metal sheet.
  • the debossed areas extend radially outward of the core at the outer side of the flanges. Care should be taken that the material is compressed - and not deformed - as this would lead to a deformed inner side of the flange that on its turn could lead to winding problems.
  • a magnetic reduction means is provided in the attraction zone.
  • the purpose of this magnetic reduction means is to reduce the magnetic attraction of the magnetic spool holder.
  • the magnetic reduction means reduces the force that is needed to pull the spool - be it empty or full - from the spindle.
  • the presence of a magnetic reduction means on the spool eliminates the need to adjust the magnetic attraction force on the magnetic spool holder.
  • Prior art spools as well as the inventive spools can thus be used interchangeably on the same creel.
  • the magnetic reduction means can be a non-magnetic layer that is present in at least part of the attraction zone. More preferred the non-magnetic layer is present in an annular zone that contacts the rim of the housing of the magnet of the magnet holder.
  • the non-magnetic layer can be provided in the form of a - possibly self-adhesive - polymer disk with a copy of the bore hole and optional drive holes' position.
  • a distance between the magnet and the flange of between 1.0 and 2.0 mm is necessary in order to abate the magnetic attraction of the spools sufficiently on currently used creels. Therefore more preferred is if the thickness of the polymer disk is between 0.1 and 0.5 mm, for example 0.3 mm.
  • An alternative way to implement a non-magnetic layer in at least the attraction zone is to provide the polymer layer as a non-magnetic paint. This is the easiest to implement as it can be applied during the production of the spool and does not need additional production and mounting of a polymer disc.
  • the thickness of the layer is at least 0.1 mm and at most 0.5 mm, or even more preferred between 0.1 and 0.4 mm, or even between 0.2 and 0.3 mm. These paint thicknesses are much higher than the normally applied electrostatically applied paints on prior art spools.
  • the magnetic attraction will remain too high. If the magnetic layer is too thick, the magnetic attraction will be too low that may lead to slip of the spool on the magnet holder.
  • the magnetic reduction means takes the form of one, two or more depressions in the attraction zone.
  • 'depressions' is meant an indentation of the metal sheet within the attraction zone that is lower than the edge, the outer border of the attraction zone.
  • the axial height of the outer edge or border of the attraction zone is the level of the attraction zone.
  • the depressions must be at least 0.5 mm below the level of the attraction zone.
  • the surface area of the one, two or more depressions is at least 30% to 100% of the total area of the attraction zone. If the depressions are 1.0 mm below the level of the attraction zone, the surface of the one, two or more depressions can be smaller, for example between 20 to 80% of the total area of the attraction zone.
  • the magnetic reduction will not be sufficient. If the total surface is too high, the metal spool will release too easily and - even worse - may start to slip on the magnetic holder.
  • the depression can be a single closed area centred around the bore hole. In any case the radially outer limit of the depression must still be within the attraction zone. In a single closed area around the bore hole the metal sheet is sunken compared to the level of the attraction zone.
  • the one closed area can be an annular area centred around the bore hole.
  • the magnetic reduction means is in the form of two, three or more protrusions, bumps, ridges in the attraction zone.
  • the protrusions are preferable deformed in the metal sheet of the flange. The protrusions contact the magnet and ensure a sufficient distance between the magnet and the attraction zone.
  • the height of the three or more protrusions relative to the level of the attraction zone is between 1.1 mm and 2.0 mm, or even between 1.1 and 1.5 mm.
  • the axial height of the outer border of the attraction zone is the level of the attraction zone.
  • the area of the protrusions should be sufficiently small for instance smaller than the area of the optional drive hole in order not to have increased attraction to the magnet by the contacting protrusions.
  • the protrusion can for example be a round raising, a height in the metal sheet with a diameter of 10 mm or less. This embodiment has the advantage that it is independent of the magnet to rim distance.
  • the protrusions can be two, three, four, five up to twenty four, elongated, radially elongated ridges extending just over the attraction zone.
  • the ridges contact the rim of the metal housing of the magnetic spindle and thereby ensure sufficient distance between magnet and spool flange.
  • the ridges should extend between 0.1 and 1.0 mm, or even between 0.2 and 0.5 mm or even more preferred between 0.2 and 0.4 mm above the level of the surrounding attraction zone.
  • the magnetic reduction means takes the form of additional holes or openings that are made in the attraction zone. Indeed, by removing magnetic material in the attraction zone, the magnetic attraction is diminished.
  • the attraction diminishes linear with the amount of material removed. In order to have sufficient effect at least 10% to 40% of the total area of the attraction zone must be removed. In the amount of area removed, the surface area of the optional one or more drive holes are included. Care should be taken that the additional openings do not interfere with the drive holes i.e. could be mistaken for drive holes. Also there is a limit to the amount of material that can be removed as this also jeopardizes the strength of the spool. The inventors estimate that at least 50% of the material must remain.
  • the metal core of the spool has an outer core diameter 'Do' and the flanges have a flange diameter 'Df'.
  • the difference (Df-Do) must be less than half of the flange diameter, even more preferred is if it is less than one third of the flange diameter.
  • the ratio (Df-Do)/Df is less than 50% or less than 40%, or even less than 35%. This reduces the volume on the spool that can be used for winding wire relative to the total volume of the spool to less than 75% or less than 64% or even less than 55%.
  • the useful volume is reduced in the inventive spool compared to conventional spools that have a volume usage of more than 75%, even more than 88%.
  • Monofilaments have a diameter that is larger than the filament diameters in conventional multi-filament steel cords.
  • the monofilaments - when wound on a conventional spool that typically has a core diameter of 117 mm - tend to adapt to the smaller core diameter of the conventional spool.
  • the monofilament When the monofilament is then unwound from the conventional spool the monofilament has an arced aspect with a too small radius of curvature. The problem aggravates when the monofilament nears the core of the spool i.e. near the end of the spool.
  • the flange size Df is typically set to between 300 mm to 250 mm, or between 280 and 250 mm, 255 mm being the standard.
  • the core of the spool is provided with a steel wire retention hole for holding the end of the steel wire at the start of the winding.
  • Conventional steel wire retention holes are circular.
  • a metal spool whereon steel monofilament is wound is presented.
  • the monofilament has a diameter 'd' that is typically between 0.25 and 0.50 mm, for example between 0.299 and 0.351 mm.
  • the metal spool is the metal spool as presented before in according any one of the different embodiments on its own or taken in combination.
  • the ratio of the outer core diameter Do and monofilament diameter Do/d is larger than 400, or even larger than 430.
  • Figure 1 shows the inventive spool 100 in its most generic form.
  • the spool consists of a core 104 and two flanges 102, 102' welded to the core.
  • the spool has a central bore hole of 33 mm, suitable for use on a steel cord creel.
  • the outer flange diameter Df is 255 mm and the core outer core diameter Do is 173 mm. Hence (Df - Do)/Df is 32% or the core diameter is about two thirds of the flange diameter: see Figure 2a . So only 54% of the volume internal to the cylinder capped by the spool flanges can be filled with wire. In prior art spools the core diameter is smaller than half of the flange diameter (117 mm vs 255 mm) and useable volume of the spool is 79 % of the volume internal to the spool flanges.
  • the flanges 102, 102' are made of a ferromagnetic material notably S355MC according EN10149-2 with a yield strength of about 355 MPa.
  • the flanges have a thickness of 1.7 mm which is much thicker than the current art spools having a thickness of 1.2 mm.
  • the flanges resist better the bending under the pressure of the monofilament compared to the prior art spools.
  • due to the increased presence of magnetic mass - the sheet metal - the pull-off force needed to pull an empty spool from the magnetic spindle reaches 250 N, exceeding the 200 N which is the currently acceptable maximum force.
  • the spool flange is attracted by the magnetic spindle in the annular attraction zone indicated by 110.
  • a magnetic reduction means is provided in the attraction zone 110 to reduce the attraction by the magnet.
  • the magnetic spool holder may comprise the possibility to reduce attraction (for example by mounting the magnet deeper into its housing), it is far more easier for the user to mount spools adapted to be used on the current creel setting than to have to adjust the hundreds of magnetic spool holders on the creel.
  • the spool is also provided with four drive holes 106 to enable the spools also to be used on a steel cord creel using non-magnetic spool holders that use a drive pin to immobilise the spool relative to the spool holder.
  • Rectangular embossings 103 further increase the bending resistance of the flanges. At those embossings the metal sheet is locally compressed. Care needs to be taken that the embossing does not reach through the flange: the inside of the flange must remain flat and smooth at all times.
  • Retention holes for the monofilament that end in a V-shape such as a 'lens shape' 114 or even a 'teardrop shape' 112 are provided in a the core of the spool.
  • the ending in a 'V'-shape helps to retain the smooth and slippery monofilament.
  • a first way to provide a magnetic attraction reduction means is to provide a non-magnetic layer 220 in at least part of the attraction zone 210 (see Figure 2 ).
  • the non-magnetic layer is present as an annular painted layer at the border of the attraction zone.
  • the non-magnetic layer must position between the rim of the housing of the magnet of the magnetic spool holder and the spool flange.
  • Figures 4a and 4b show a second way to provide a magnetic attraction reduction means in the form of four elongated protrusions or ridges 440, 440', 440", 440'" that are radially oriented and extend axially outwardly from the attraction zone as shown in section CC' of Figure 4a .
  • the ridges provide a gap between the flange and the rim of the housing of the magnet of the magnetic spool holder and thereby reduce the magnet attraction to the bulk of the flange.
  • the ridges 440, 440', 440", 440'” only extend 200 ⁇ m above the level of the attraction zone that is the axial position of the border of the attraction zone excluding the ridges.
  • the surface of the ridges is kept minimal for example 4 mm wide and 20 mm long.
  • FIG. 3a An alternative - depicted in Figures 3a, 3b - and opposite way to the previous embodiment of providing a magnetic attraction reduction means is to increase the distance between the bulk of the attraction zone and the magnet by retracting the flange body relative to the level at the border of the attraction zone.
  • this has been realised by providing depressions 330, 330', 330", 330'" in the attraction zone. These depressions cover an area of 25 % of the total attraction zone and reach 750 ⁇ m below the level of the outer border of the attraction zone as shown in section BB' of Figure 3a .

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EP20152346.1A 2020-01-17 2020-01-17 Metallspule Active EP3851402B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
RS20240461A RS65439B1 (sr) 2020-01-17 2020-01-17 Metalni kalem
FIEP20152346.1T FI3851402T3 (fi) 2020-01-17 2020-01-17 Metallikela
EP20152346.1A EP3851402B1 (de) 2020-01-17 2020-01-17 Metallspule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20152346.1A EP3851402B1 (de) 2020-01-17 2020-01-17 Metallspule

Publications (2)

Publication Number Publication Date
EP3851402A1 true EP3851402A1 (de) 2021-07-21
EP3851402B1 EP3851402B1 (de) 2024-04-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20152346.1A Active EP3851402B1 (de) 2020-01-17 2020-01-17 Metallspule

Country Status (3)

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EP (1) EP3851402B1 (de)
FI (1) FI3851402T3 (de)
RS (1) RS65439B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11401131B2 (en) * 2015-07-22 2022-08-02 Max Co., Ltd. Reel with indicator information

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396919A (en) 1966-03-01 1968-08-13 Gen Cable Corp Magnetic bobbin holding device
US5460333A (en) * 1992-07-21 1995-10-24 N.V. Bekaert S.A. Method apparatus and spool for automated winding
USD504806S1 (en) * 2004-05-27 2005-05-10 N.V. Bekaert S.A. Reel
WO2015104315A1 (en) * 2014-01-13 2015-07-16 Nv Bekaert Sa Spool fixation device with bi-stable magnet assemblies

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396919A (en) 1966-03-01 1968-08-13 Gen Cable Corp Magnetic bobbin holding device
US5460333A (en) * 1992-07-21 1995-10-24 N.V. Bekaert S.A. Method apparatus and spool for automated winding
USD504806S1 (en) * 2004-05-27 2005-05-10 N.V. Bekaert S.A. Reel
WO2015104315A1 (en) * 2014-01-13 2015-07-16 Nv Bekaert Sa Spool fixation device with bi-stable magnet assemblies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11401131B2 (en) * 2015-07-22 2022-08-02 Max Co., Ltd. Reel with indicator information

Also Published As

Publication number Publication date
RS65439B1 (sr) 2024-05-31
EP3851402B1 (de) 2024-04-10
FI3851402T3 (fi) 2024-07-04

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