EP2098470A1 - Dispositif d'enroulement destiné à enrouler un matériau en forme de bande - Google Patents

Dispositif d'enroulement destiné à enrouler un matériau en forme de bande Download PDF

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Publication number
EP2098470A1
EP2098470A1 EP08003905A EP08003905A EP2098470A1 EP 2098470 A1 EP2098470 A1 EP 2098470A1 EP 08003905 A EP08003905 A EP 08003905A EP 08003905 A EP08003905 A EP 08003905A EP 2098470 A1 EP2098470 A1 EP 2098470A1
Authority
EP
European Patent Office
Prior art keywords
spreader
roller
winding device
strip
winding
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Withdrawn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
EP08003905A
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German (de)
English (en)
Inventor
Günter Klemm
Adam Kowalewski
Karim Grossenbach
Wolfgang Achtner
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.)
Applied Materials Inc
Original Assignee
Applied Materials Inc
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 Applied Materials Inc filed Critical Applied Materials Inc
Priority to EP08003905A priority Critical patent/EP2098470A1/fr
Publication of EP2098470A1 publication Critical patent/EP2098470A1/fr
Withdrawn legal-status Critical Current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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/022—Registering, tensioning, smoothing or guiding webs transversely by tentering devices
    • B65H23/025—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers

Definitions

  • the invention relates to a winding device for winding a strip-shaped material, preferably a film web, with an unwinding device for feeding the strip-shaped material from an unwinder to a treatment station for continuously treating the strip-like material, and with a winding device for feeding the treated strip-like material from the treatment station a rewinder, wherein the unwinding device and / or the winding device in each case has a spreader roll for guiding and spreading the strip-like material, which is in its wrapping area with one side of the band-shaped material, preferably with a non-treated underside in operative connection.
  • Winding devices of the above type are used in installations in which strip material, e.g. Webs or strips of thin paper, metal or plastic, in particular thin films, are continuously surface-treated in a treatment station, with a particularly important on a smooth and wrinkle-free guidance of the strip-shaped material both before treatment and after treatment.
  • These winding devices are used in particular in belt coating systems with a treatment station designed as a coating station for the continuous coating of film webs.
  • high demands are placed on a smooth and wrinkle-free guidance during vapor deposition or sputtering of specially thin film strips or webs with metallic layers under vacuum.
  • the winding device comprises an unwinding device which is arranged upstream of the treatment or coating station along the winding path of the film web and feeds the film web to be treated, for example, from an unwinding roll of an unwinder to a coating roller.
  • the winding device also comprises a take-up device which is connected downstream of the winding path of the film web of the treatment or coating station and the treated film web, for example, by a coating roller of the coating station of a take-up reel of the rewinder supplies.
  • the unwinding and winding device has in each case a spreader roll for smoothing and widening the film web.
  • a wrap-around region is formed, in which the spreader roll is in operative connection with one side of the strip material.
  • the non-treated underside of the strip material so the side which faces away from the top of the strip material to be treated, is stretched.
  • the unwinding or winding device may also be associated with further rolls, such as tensioning, measuring or deflection rolls.
  • the treatment or coating station may additionally have cooling rollers.
  • the spreader rolls are configured with a curved contour of the lateral surface along their roll axis, so that a spreading effect, primarily transversely to the winding direction or to the winding path, is exerted on the strip material in the wrapping region of the spreader roll in which the strip material is in operative connection with the spreader roll which smoothes the strip material.
  • Spreader rolls are known, which are designed as curved rubber rolls (banana rolls) (reference DE 1 560 130 ).
  • segmented spreader rolls are according to the document EP 0 470 332 and US 527 3197 known, which are composed of a plurality of juxtaposed, cylindrical roller bodies which are rotatably mounted on a straight or curved axis.
  • These spreader rolls have the disadvantage that their spreading effect is usually good only in the middle region of the strip material, while the edge region of the strip material is stretched little or not at all. In particular, when used for thin film webs thereby form wrinkles in the edge region of the film web.
  • a segmented double frusto-conical spreader roll which achieves an improved spreading effect across the width of the strip material.
  • This spreader roller consists of two frusto-conical roller sections, wherein each roller section is composed of juxtaposed, frusto-conical roller bodies which are rotatably mounted on the axis section of the respective roller section. The two axis portions of the roller sections are connected at an obtuse angle to each other.
  • the spreading effect of this spreader roller is not sufficiently uniform for certain applications.
  • the invention has for its object to provide a winding device, which reduces or avoids the wrinkling during winding of band-shaped material, in particular of thin film webs.
  • the object is achieved by a device having the features of claim 1 and with a coil coating system according to claim 17.
  • the unwinding device has a second spreader roll and / or the winding device has a second spreader roll which is operatively connected in its looping area to the same side of the strip-shaped material.
  • the unwinding device is equipped with a second spreader roll which is assigned to the first spreader roll already present in the unwinding device.
  • the take-up device is equipped with a second spreader roll which is associated with the first spreader roll already present in the take-up device.
  • the invention is based on the assumption that in the case of a particularly thin band-shaped material which is subjected to particularly thermal or mechanical stress by the treatment process, a greater spreading effect is necessary in order to compensate for the increased elongation phenomena associated with the stress of the band-shaped material and counteract wrinkling can.
  • an enhancement of the spreading effect with only one spreader roll for example by increasing the tensile stress, leads to a more uneven spreading effect over the width of the strip-shaped material. If the spreading is too big, return wrinkles also occur.
  • the first and second spreader rollers are successively arranged along a winding path of the band-shaped material. Due to the immediately consecutive sequences of the spreading along the winding path of the strip material, the spreading on the strip material as a whole is particularly effective.
  • first and the second spreader rolls are arranged along a winding path of the strip-like material between a first deflecting roll and a second deflecting roll, the tension applied to the strip material in the area of the spreader rolls can be well metered.
  • the guide rollers and the spreader rollers are so assigned to each other, that the first spreader roller and the second spreader roller from each other have different sized wrap areas.
  • the size of the wrapping areas is determined by the angle of wrap of the strip material around the spreader roll. Due to the different assignability of the deflecting rollers and the spreader rollers, the spreading effect to be applied to the strip material can be adjusted in accordance with the respective type and thickness of the strip material, which has an advantageous effect particularly on the film web of different elasticity.
  • certain thin strip materials such as e.g. flexible, cold laminated OPP (OPP) film sheets
  • OPP cold laminated OPP
  • the first spreader roll stronger, d. H. with a larger wrap angle to wrap around than the second spreader roll.
  • the first spreader roll less, d. H. with a smaller wrap angle, to wrap around than the second spreader roll.
  • the wrap-around region of the first spreader roll is formed with a wrapping angle of 60 ° to 100 ° and the wrapping region of the second spreader roll with a wrapping angle of 30 ° to 90 °.
  • a wrap angle of the first spreader roll in an angular range of 60 ° to 100 ° and a wrap angle of the second spreader roll in a Angular range from 30 ° to 90 ° especially for OPP film webs with a film thickness of approx. 2.0 to 5 ⁇ m, achieves best spreading results.
  • a third deflecting roller is arranged along the winding path of the strip-shaped material between the first spreader roll and the second spreader roll, the size variability of the wrapping regions, or the wrap angle, of the two spreader rolls can be increased.
  • this small Umschlingungs Kunststoffe can be generated on the spreader rollers. This is particularly advantageous for the spreading of film webs having less elasticity, such as e.g. PET film webs (PET polyethylene terephthalate), which require less spreading.
  • PET film webs PET polyethylene terephthalate
  • the wrapping area of the first spreader roll with an angle of wrap of 15 ° to 30 ° and the looping area of the second spreader roll with an angle of wrap of 20 ° to 60 ° are advantageously formed.
  • Tests have shown that best spreading results are achieved for PET film webs with a film thickness of about 1.0 to 3 ⁇ m, if the first spreader roll with a wrap angle in an angle range of 15 ° to 30 ° and the second spreader roll with a wrap angle in an angle range of 20 ° to 60 ° is wrapped.
  • non-contact path lengths of the strip-like material are formed along the winding path between the guide rollers and the spreader rollers, wherein the path length between the first guide roller and the first spreader roller in a range of 150 mm to 250 mm, the path length between the first spreader roller and the second spreader roll in a range of 100 mm to 150 mm and the path length between the second spreader roll and the second deflecting roll is in a range of 40 mm to 80 mm.
  • an adjusting means is provided, by means of which at least one deflection roller is adjustable relative to the spreader rollers and preferably continuously.
  • the adjustment of the guide roller by means of a suitable actuating means includes a rack gear or a spindle gear, which acts on the two-sided bearings of the guide roller and this along a guide from eg guide rails, moves.
  • a horizontal or vertical adjustment of the guide roller can be done for example by means of horizontally or vertically aligned guide rails along which the bearing points of the guide roller can be moved.
  • the guide rails can be designed, for example, in a tandem arrangement in which the one guide (horizontal guide rails), on which the guide roller is movably mounted, is movably mounted along the intersecting guide (vertical guide rails).
  • the wrap angle of the wrap can be adjusted in small increments and adapted to the needs of the strip material used as needed.
  • the third deflection roller is adjustable by means of a rotatably mounted rocker.
  • the third guide roller can be adjusted in different positions in association with the spreader rollers and thus the size of both Umschlingungs Schemee the strip material to the spreader rollers are varied simultaneously with low design resources.
  • the third deflecting roller is adjustable to a zero position outside the winding path of the strip-shaped material between the first spreader roll and the second spreader roll. In this zero position, the third guide roller is not involved in the winding path of the strip-shaped material, so that the guide roller is ineffective in this position for the winding process.
  • both small Umschlingungs Schemee can be produced universally on the spreader rollers, namely while the third guide roller is in operative connection with the strip material along the winding path; it can with the same design of the winding device but Even large Umschlingungs Schemee be produced on the spreader rolls, even while the third guide roller is out of operative connection with the strip material.
  • the winding device can be universally adapted to different winding conditions of different strip materials.
  • the variability of the various wrap areas is also increased if an adjusting means is provided by means of which the first spreader roll and the second spreader roll are adjustable relative to one another and preferably continuously.
  • the variability of the wrapping areas is also promoted if the first and second spreader rollers have a different diameter from each other.
  • the first and / or the second spreader roller is formed as a segmented double frustum roller consisting of two frusto-conical roller sections, each having a plurality of juxtaposed, frusto-conical roller segments which are rotatably mounted on an axis portion, wherein the axis portions the roller sections are connected at an obtuse angle to each other.
  • a Doppelkegelstumpfwalze is used, the roller sections has a cone angle of less than or equal to 0.3 °, preferably 0.2 °. Assuming that the Doppelkegelstumpfwalze has a shell surface formed by generatrices, the generatrices with the associated intercept portion give a cone angle. A particularly small cone angle of the double truncated cone of less than or equal to 0.3 °, preferably 0.2 °, avoids the occurrence of stretch creases and return pleats in the ribbon material.
  • a rotary adjusting mechanism which generates a rotational position of the double truncated cone roller, the position of the jacket straight line can be adjusted relative to the wrapping region.
  • various advantageous effects on the spreading of the respective film web can be produced.
  • the arrangement of the double truncated cone roller in such a rotational position that substantially matches the position of the jacket straight line with a flow line delimiting the wrap area is particularly suitable for a wrinkle-free guidance of PET film webs with a film thickness of about 1.0 to 3 ⁇ m.
  • the discharge line denotes the respective generatrix lines of the two roller sections, at which the strip material is detached from the lateral surface of the double frustoconical roller.
  • the rotational position of the double-frustoconical roller the mantle straight is substantially congruent with this flow line.
  • the mantle straight line is at the outer edge of the wrap, so that the entire wrap is in the direction of the winding path completely in front of the mantle straight line.
  • the invention is based on the assumption that that portion of the looping area which is located in the direction of the winding path in front of the jacket straight line is extremely important for the spreading effect.
  • the wrap-around region, which is located completely in front of the jacket straight line, has a particularly advantageous effect on strip materials of lower elasticity, such as PET film webs, in which relatively small wrap-around areas with a low wrap angle are used. According to the above embodiment, a sufficient spreading effect is achieved even with small wrap areas.
  • the arrangement of the double-frustoconical roller in such a rotational position that the position of the mantle straight line relative to the flow line offset by an angle of rotation is arranged which is substantially less than or equal to 1/3 of the wrap angle of the wrap, particularly suitable for a wrinkle-free guidance of OPP films with a film thickness of about 2.0 to 5 microns.
  • the jacket straight line is within the wrap, so that a proportion of about 2/3 and more of the wrap is in the direction of the winding path in front of the mantle straight line.
  • Fig. 1 is an unwinding 1a of the winding device according to the invention for winding and guiding a thin film web 2, especially an OPP film web with a film thickness of 2.0 to 5 microns, in a belt coating not shown in detail for continuous coating of the film web 2 in vacuum visible.
  • the film web 2 takes in the unwinding device 1a a winding path 3 from a unwinding reel, not shown, to a coating roller 4 of a coating chamber, not shown. In the coating chamber, the film web 2 is coated, for example, by vapor deposition of a metal layer.
  • the unwinding device 1a comprises for spreading the film web 2 a first spreader roll 5 and a second spreader roll 6, which are arranged successively along the winding path 3.
  • the unwinding device 1a also comprises a first and a second deflecting roller 7, 8, wherein the first deflecting roller 7 is upstream of the first coating roller 5 with respect to the winding path 3 and the second deflecting roller 8 is disposed downstream of the second coating roller 6, so that the first and second spreader rollers 5, 6 extend along the winding path 3 between the first and second Deflection roller 7,8 is located.
  • the first and the second spreader rollers 5, 6 are each in the manner of a known double-frustum roller (eg according to FIG Fig. 1 to 3 of the EP 1 591 392 A1 ) are executed with two frustoconical roller sections, wherein the frusto-conical roller sections are connected to each other facing with their tapered end not shown.
  • Each roller section is composed of juxtaposed, frusto-conical roller bodies which are rotatably mounted on an axis portion of the roller section.
  • the two roller sections are interconnected such that the axle sections are directed at an obtuse angle to each other.
  • the two frusto-conical roller sections are encompassed by a lateral surface 11 which is formed by a plurality of generatrices extending along the roller sections.
  • the mutually linearly aligned generatrix lines of the roller sections form a straight line jacket straight line 12 along the double-frustoconical roller, which in FIG Fig. 1 perpendicular to the plane of the drawing and is indicated by a dot.
  • Each of the spreader rollers 5, 6 has on its outer surface 11 each a wrap 13, 14, in which the spreader roller 5, 6 with one side 15 of the film web 2 is in adhesive bond.
  • the spreader roller 5, 6 are one and the same side 15 of the film web 2, namely the non-coated underside 15 of the film web 2 assigned.
  • a more or less large wrap region 13, 14 is formed whose size is determined by a wrap angle 16, 17.
  • the wrapping area 13, 14 is limited on the unrolling side by a discharge line 18, which is formed by the respective generatrices of the two roller sections, at which the film web 2 detaches from the lateral surface 11 of the Doppelkegelstumpfwalze when rolling.
  • the flow line 18 runs in Fig. 1 also perpendicular to the plane of the drawing and is indicated by a dot.
  • the arrangement of the spreader rollers 5, 6 to each other and the assignment of the guide rollers 7, 8 to the two spreader rollers 5, 6 is in the embodiment according to Fig. 1 chosen so that the wrap 13 of the first spreader roller 5 with a wrap 16 of about 90 ° and the wrap 14 of the second spreader roller 6 with a wrap angle 17 of about 60 ° results.
  • other arrangements of the guide rollers 7, 8 and spreader rollers 5, 6 to each other includes the invention, the corresponding variable loop portions 13, 14 of the spreader rollers 5, 6 result.
  • the first and the second spreader rollers 5, 6 are each in a rotational position, in which the position of the mantle straight line 12 is offset relative to the discharge line 18 by a rotational angle 19, 20, so that the mantle straight 12 of the spreader roller 5, 6 within the Umschlingungs Schemees 13,14, wherein the rotation angle 19, 20 is less than or equal to 1/3 of the wrap angle 16, 17 of the respective wrap 13,14.
  • the angle of rotation 19 at the first spreader roller 5 with approximately 25 ° (smaller 1/3 of the wrap angle 16) and the rotation angle 20 at the second spreader roller 6 with approximately 20 ° (substantially 1/3 of the wrap 17) is provided , This ensures that in each case a share of approx.
  • the rotation angle 19, 20 can be adjusted so that the position of the mantle straight line 12 relative to the arrangement of the wrap 13, 14 can be changed.
  • the circumference of the Umschlingungs Kunststoffes 13, 14 and thus the size of the wrap angle 16, 17 is adjustable by adjusting the positions of the cooperating spreader rollers 5, 6 and guide rollers 7, 8 to each other.
  • the adjustment of the wrap angle 16 of the wrap 13 at the spreader roll 5 can be e.g. by adjusting the position of the guide roller 7, by adjusting the position of the spreader roller 6 or by adjusting the position of the spreader roller 5 itself.
  • the adjustment of the wrap 17 of the wrap 14 on the spreader roller 6 by adjusting the position of the guide roller 8, by adjusting the position of the spreader roller 5 or by adjusting the position of the spreader roller 6 itself.
  • the winding device according to the invention in the embodiment and arrangement according to the preceding embodiment according to Fig. 1 allows a wrinkle-free winding of the film web 2, especially the OPP film web with a film thickness of 2.0 to 5 microns, on the coating roller. 4
  • Fig. 2 is the unwinding device 1b of the winding device according to the invention
  • Fig. 1 shown in a second embodiment.
  • the unwinding device 1b according to the second embodiment differs from the unwinding device 1a according to the embodiment described above essentially by an additional third deflecting roller 21, which is integrated into the winding path 3 of the film web 2. It will be described below primarily the differences in the embodiments. With regard to the otherwise matching design features Reference is made to the explanations to the preceding embodiment. The same reference numerals designate the same parts.
  • the unwinding 1b after Fig. 2 is intended for winding a film web 2, especially a PET film web with a film thickness of 1.0 to 3 microns.
  • the third guide roller 21 of the unwinding device 1 b is arranged with respect to the winding path 3 between the first spreader roller 5 and the second spreader roller 6.
  • the winding device according to the invention in the embodiment and arrangement according to the second embodiment according to Fig. 2 allows a wrinkle-free winding of the film web 2, especially the PET film web with a film thickness of 1.0 to 3 microns, on the coating roller. 4
  • Fig. 3 is the unwinding device 1c of the winding device according to the invention after Fig. 1 shown in a third embodiment.
  • the unwinding device 1c according to the third embodiment differs from the unwinding device 1b according to the second embodiment described above essentially in that the position of the third deflecting roller 21 is adjustable by means of an elongate rocker 22. It will be described below primarily the design differences with respect to the unwinding device 1b according to the second embodiment. With regard to the otherwise matching execution features, reference is made to the explanations for both above exemplary embodiments. The same reference numerals designate the same parts.
  • rocker 22 One of the two ends of the rocker 22 is connected to a fixed axis of rotation 23, in the Fig. 3 represented by a point, rotatably connected.
  • each of the two sides of the guide roller 21 running axle bearing 24 is mounted on a respective rocker 22. (In the illustration after Fig. 3 only the rocker 22 of the two identical rockers 22 lying in the foreground of the drawing can be seen). Both rockers 22 are moved parallel and synchronously about the axis of rotation 23. To avoid collisions with the axle bearings of the spreader roller 5, the rocker 22 is preferably formed angled.
  • the guide roller 21 with little effort in different positions in association with the spreader rollers 5 and 6 adjustable, whereby the size of the belt portions 13, 14 of the film web 2 to the spreader rollers 5, 6 can be easily varied.
  • the spreader rollers 5,6 are so far apart from each other in their arrangement according to the preceding embodiments, that the guide roller 21 can be moved by means of the rocker 22 in a zero position P0 between the spreader roller 5 and 6. In this zero position, the contact of the guide roller 21 is lifted to the film web 2, so that the guide roller 21 in this position for the winding process of the film web 2 is ineffective.
  • the guide roller 21 is hereby not integrated in the winding path 3 of the film web 2 comparable to the first embodiment.
  • both the function of the winding device according to the embodiment of the unwinding device 1a according to the first embodiment and the function of the winding device according to the embodiment of the unwinding device 1b according to the second embodiment can be realized.
  • the unwinding device 1c with appropriate adjustment of the position of the guide roller 21 and in connection with the variable rotational position of the spreader rollers 5, 6 are adapted as needed to the winding conditions of different types of films with different film thicknesses.
  • the optimal setting of the unwinding device 1c can be selected by software according to the respective strip material.

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EP08003905A 2008-03-03 2008-03-03 Dispositif d'enroulement destiné à enrouler un matériau en forme de bande Withdrawn EP2098470A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08003905A EP2098470A1 (fr) 2008-03-03 2008-03-03 Dispositif d'enroulement destiné à enrouler un matériau en forme de bande

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08003905A EP2098470A1 (fr) 2008-03-03 2008-03-03 Dispositif d'enroulement destiné à enrouler un matériau en forme de bande

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EP2098470A1 true EP2098470A1 (fr) 2009-09-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549395A (zh) * 2020-06-08 2020-08-18 湖南东映碳材料科技有限公司 一种沥青纤维原位开卷的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056571B (de) * 1956-09-19 1959-05-06 Wittler & Co H Breitstreckwerk fuer Warenbahnen
US3268142A (en) * 1964-03-12 1966-08-23 Macomson Wistar Wright Web tensioner and spreader
DE1560130A1 (de) 1966-04-01 1969-07-17 Axel Springer & Sohn Vorrichtung zum Trennen einer sich bewegenden,aus mehreren Einzelbahnen bestehenden Materialbahn
US3727816A (en) * 1971-12-27 1973-04-17 P Meneo Web-guiding apparatus
EP0470332A1 (fr) 1990-08-09 1992-02-12 Leybold Aktiengesellschaft Rouleau pour guider et étirer des bandes et/ou des feuilles continues
US5273197A (en) 1991-08-10 1993-12-28 Leybold Aktiengesellschaft Roller for guiding and stretching bands and film webs
EP1591392A1 (fr) 2004-03-26 2005-11-02 Applied Films GmbH & Co. KG Aménagement de rouleaux élargisseurs pour un guidage de bandes sans rides

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056571B (de) * 1956-09-19 1959-05-06 Wittler & Co H Breitstreckwerk fuer Warenbahnen
US3268142A (en) * 1964-03-12 1966-08-23 Macomson Wistar Wright Web tensioner and spreader
DE1560130A1 (de) 1966-04-01 1969-07-17 Axel Springer & Sohn Vorrichtung zum Trennen einer sich bewegenden,aus mehreren Einzelbahnen bestehenden Materialbahn
US3727816A (en) * 1971-12-27 1973-04-17 P Meneo Web-guiding apparatus
EP0470332A1 (fr) 1990-08-09 1992-02-12 Leybold Aktiengesellschaft Rouleau pour guider et étirer des bandes et/ou des feuilles continues
US5273197A (en) 1991-08-10 1993-12-28 Leybold Aktiengesellschaft Roller for guiding and stretching bands and film webs
EP1591392A1 (fr) 2004-03-26 2005-11-02 Applied Films GmbH & Co. KG Aménagement de rouleaux élargisseurs pour un guidage de bandes sans rides

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549395A (zh) * 2020-06-08 2020-08-18 湖南东映碳材料科技有限公司 一种沥青纤维原位开卷的方法
CN111549395B (zh) * 2020-06-08 2022-07-12 湖南东映碳材料科技有限公司 一种沥青纤维原位开卷的方法

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