DK164689C - Fiberplade - Google Patents

Fiberplade

Info

Publication number
DK164689C
DK164689C DK078287A DK78287A DK164689C DK 164689 C DK164689 C DK 164689C DK 078287 A DK078287 A DK 078287A DK 78287 A DK78287 A DK 78287A DK 164689 C DK164689 C DK 164689C
Authority
DK
Denmark
Prior art keywords
fiber plate
fiber
plate
Prior art date
Application number
DK078287A
Other languages
Danish (da)
English (en)
Other versions
DK164689B (da
DK78287D0 (da
DK78287A (da
Inventor
Takayoshi Nakajima
Hidetaka Oohori
Minoru Takada
Original Assignee
Chisso Corp
Kaihatsu Board 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=12391652&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DK164689(C) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Chisso Corp, Kaihatsu Board Corp filed Critical Chisso Corp
Publication of DK78287D0 publication Critical patent/DK78287D0/da
Publication of DK78287A publication Critical patent/DK78287A/da
Publication of DK164689B publication Critical patent/DK164689B/da
Application granted granted Critical
Publication of DK164689C publication Critical patent/DK164689C/da

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/253—Cellulosic [e.g., wood, paper, cork, rayon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • Y10T428/2931—Fibers or filaments nonconcentric [e.g., side-by-side or eccentric, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608—Including strand or fiber material which is of specific structural definition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
    • Y10T442/638—Side-by-side multicomponent strand or fiber material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
    • Y10T442/64—Islands-in-sea multicomponent strand or fiber material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
    • Y10T442/641—Sheath-core multicomponent strand or fiber material

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Textile Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
DK078287A 1986-02-18 1987-02-17 Fiberplade DK164689C (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61033626A JPS62199860A (ja) 1986-02-18 1986-02-18 木質繊維マツト
JP3362686 1986-02-18

Publications (4)

Publication Number Publication Date
DK78287D0 DK78287D0 (da) 1987-02-17
DK78287A DK78287A (da) 1987-08-19
DK164689B DK164689B (da) 1992-08-03
DK164689C true DK164689C (da) 1992-12-21

Family

ID=12391652

Family Applications (1)

Application Number Title Priority Date Filing Date
DK078287A DK164689C (da) 1986-02-18 1987-02-17 Fiberplade

Country Status (8)

Country Link
US (1) US4738895A (de)
EP (1) EP0233767B1 (de)
JP (1) JPS62199860A (de)
KR (1) KR910002512B1 (de)
CN (1) CN1010201B (de)
AU (1) AU592849B2 (de)
DE (1) DE3772586D1 (de)
DK (1) DK164689C (de)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02128863A (ja) * 1988-11-09 1990-05-17 Graphtec Corp サーマルヘッドアレイ
US5382400A (en) 1992-08-21 1995-01-17 Kimberly-Clark Corporation Nonwoven multicomponent polymeric fabric and method for making same
US5336552A (en) 1992-08-26 1994-08-09 Kimberly-Clark Corporation Nonwoven fabric made with multicomponent polymeric strands including a blend of polyolefin and ethylene alkyl acrylate copolymer
US5405682A (en) 1992-08-26 1995-04-11 Kimberly Clark Corporation Nonwoven fabric made with multicomponent polymeric strands including a blend of polyolefin and elastomeric thermoplastic material
CA2092604A1 (en) 1992-11-12 1994-05-13 Richard Swee-Chye Yeo Hydrophilic, multicomponent polymeric strands and nonwoven fabrics made therewith
US5482772A (en) 1992-12-28 1996-01-09 Kimberly-Clark Corporation Polymeric strands including a propylene polymer composition and nonwoven fabric and articles made therewith
US5476617A (en) * 1993-02-19 1995-12-19 The Board Of Regents Of The University Of Wisconsin Rotational and vibrational process for molding cellulosic fibers
DE4328195A1 (de) * 1993-08-21 1995-02-23 Auerbacher Ing Handel Verfahren zur Herstellung von Faserplatten und Faserformteilen mittlerer und hoher Dichte im Trockenverfahren aus lignocellulosen Fasern und chemisch modifizierten Polyamid-Polyurethan-Sekundärtextilien
RU2044636C1 (ru) * 1994-06-15 1995-09-27 Людмила Олеговна Бунина Способ изготовления пресс-материалов из отходов деревообработки, деревопереработки, отходов другого растительного сырья или их смесей
DK0891433T3 (da) 1996-03-29 2003-08-25 Fibervisions L P Polypropylenfibre og genstande fremstillet deraf
US5985193A (en) * 1996-03-29 1999-11-16 Fiberco., Inc. Process of making polypropylene fibers
US6164034A (en) * 1998-08-31 2000-12-26 Poly Proximates, Inc. Fiber-reinforced molded plastic roofing unit and method of making the same
WO2001046506A2 (en) 1999-12-21 2001-06-28 Kimberly-Clark Worldwide, Inc. Fine denier multicomponent fibers
SE0102043L (sv) * 2001-06-08 2002-12-09 Ivf Industriforskning Och Utve Träkompositmaterial och framställning därav
FR2827365B1 (fr) * 2001-07-10 2003-12-12 Panneaux Isoroy Soc D Materiau thermiquement isolant a base de fibres lignocellulosiques et procede de fabrication
DE102004053131A1 (de) * 2004-10-29 2006-05-11 Faurecia Innenraum Systeme Gmbh Flächiges Halbzeug aus einem Faserverbundwerkstoff und Verfahren zur Herstellung eines Formteils
CN100419136C (zh) * 2006-08-17 2008-09-17 付庆福 一种复合纤维及其生产方法
DE102008008471B4 (de) * 2008-02-07 2011-12-22 Faurecia Innenraum Systeme Gmbh Verfahren zur Herstellung eines Halbzeugs, Halbzeug zur Heißpressverarbeitung, Verfahren zur Herstellung eines Formteils und Formteil
DE102009057916B4 (de) * 2009-05-15 2015-04-02 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren und Vorrichtung zum kontinuierlichen Mischen von Fasern mit einem Bindemittel
EP2893435B1 (de) 2012-09-07 2019-05-08 Carnegie Mellon University Verfahren für hybride gpu/cpu-datenverarbeitung
FR3016317A1 (fr) * 2014-01-13 2015-07-17 Oleg Muzyrya Materiau composite isolant acoustiquement et thermiquement
CN104029274A (zh) * 2014-06-26 2014-09-10 东华大学 一种秸秆阻燃吸音板
ES2843199T3 (es) * 2018-07-11 2021-07-16 Faurecia Interieur Ind Componente de acabado interior a base de fibra de madera para un vehículo

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7105985A (de) * 1971-05-03 1972-11-07
US4100324A (en) * 1974-03-26 1978-07-11 Kimberly-Clark Corporation Nonwoven fabric and method of producing same
JPS5270176A (en) * 1975-12-05 1977-06-10 Hiroyuki Kanai Unwoven fabric for hybrid molding
JPS535080A (en) * 1976-07-05 1978-01-18 Mitsubishi Electric Corp Twist nematic liquid crystal composition
JPS5512858A (en) * 1978-07-11 1980-01-29 Chisso Corp Production of fiber molded article
US4418031A (en) * 1981-04-06 1983-11-29 Van Dresser Corporation Moldable fibrous mat and method of making the same
US4474846A (en) * 1981-04-06 1984-10-02 Van Dresser Corporation Moldable fibrous mat and product molded therefrom
JPS5813761A (ja) * 1981-07-17 1983-01-26 チッソ株式会社 不織布の製造方法
JPS58169560A (ja) * 1982-03-26 1983-10-06 日本バイリーン株式会社 不織布の製造方法
JPS59120440A (ja) * 1982-12-28 1984-07-12 Tohoku Kaihatsu Kk 深絞り成形用木質繊維マツトの製造方法
US4536440A (en) * 1984-03-27 1985-08-20 Minnesota Mining And Manufacturing Company Molded fibrous filtration products
US4590114A (en) * 1984-04-18 1986-05-20 Personal Products Company Stabilized absorbent structure containing thermoplastic fibers
US4555430A (en) * 1984-08-16 1985-11-26 Chicopee Entangled nonwoven fabric made of two fibers having different lengths in which the shorter fiber is a conjugate fiber in which an exposed component thereof has a lower melting temperature than the longer fiber and method of making same

Also Published As

Publication number Publication date
DK164689B (da) 1992-08-03
EP0233767B1 (de) 1991-09-04
EP0233767A2 (de) 1987-08-26
DK78287D0 (da) 1987-02-17
DK78287A (da) 1987-08-19
DE3772586D1 (de) 1991-10-10
KR870008062A (ko) 1987-09-24
CN87100798A (zh) 1988-01-20
AU6883787A (en) 1987-08-20
KR910002512B1 (ko) 1991-04-23
EP0233767A3 (en) 1989-06-14
CN1010201B (zh) 1990-10-31
US4738895A (en) 1988-04-19
AU592849B2 (en) 1990-01-25
JPS62199860A (ja) 1987-09-03
JPS6411743B2 (de) 1989-02-27

Similar Documents

Publication Publication Date Title
AT399804B (de) Sportschuh
BR8702474A (pt) Conjunto de sobre-tampa
DK164689C (da) Fiberplade
TR23428A (tr) Telekomuenikasyon teknigine mahsus baglama plaketi
DK162401C (da) Vibrationsplade
DK522087D0 (da) Underlagsskive
DK492587A (da) Substituerede indolquinoxaliner
DK162850C (da) Beklaedningsplade
TR24110A (tr) Belirli suebstitue edilmis 3-amino-2-benzoil sikloheks-2-enonlar
AT386436B (de) Schachtsystem
ATA48386A (de) Kranbahn
ATA179487A (de) Maishaecksler
SE8601108D0 (sv) Forbindningsplatta
NO172875C (no) Langstrakt ekstrudert plate
BR6600999U (pt) Conjunto otorrino laringologico
BR6600844U (pt) Conjunto bolsa-almofada
KR880001984U (ko) 안대의 지지판
ES1000384Y (es) Trompeta
DK588186A (da) Bankospilplade
FI923615A0 (fi) Substituoituja N3-tioasyylisemikarbatsideja
KR870016365U (ko) 차광판
SE8403000D0 (sv) Metalliserad fiberplatta
BR6600356U (pt) Dadotenis
BR6600495U (pt) Micro-fragmentadora
BR6600239U (pt) Condutivimetro