EP 1349983 A1 20031008 - MULTI-LAYERED STEEL CORD FOR TYRE REINFORCEMENT
Title (en)
MULTI-LAYERED STEEL CORD FOR TYRE REINFORCEMENT
Title (de)
MEHRLAGIGER STAHL?KORD FÜR REIFENARMIERUNG
Title (fr)
CABLE D'ACIER MULTICOUCHES POUR ARMATURE DE SOMMET DE PNEUMATIQUE
Publication
Application
Priority
- EP 0115189 W 20011221
- FR 0100281 A 20010104
Abstract (en)
[origin: WO02053827A1] A multi-layered steel cord with an outer unsaturated layer, which can be used as a tyre crown reinforcement, comprising a core with a diameter d>o< surrounded by an intermediary layer (C1) of four or five wires (N = 4 or 5) with a diameter d>1<, all wound into a helix with a pitch p>1<. Layer C1 is surrounded by an outer layer (C2) of P wires with a diameter d>2<, all wound into a helix with a pitch p>2<, and with P having a value 1 to 3 less than the maximum number P>max< of wires that can be wound into a layer around layer C1. The inventive steel cord has the following characteristics (d>0<, d>1<, d>2<, p>1< and p>2< in mm): - (i) 0.1 </= d>0< < 0.5; - (ii) 0.25 </= d>1< < 0.4; - (iii) 0.25 </= d>2< < 0.4; - (iv) for N = 4: 0.4 < (d>0</d>1<) < 0.8; for N = 5: 0.7 < (d>0</d>1<) < 1.1; - (v) 4.8 pi (d>0< + d>1<) < p>1< < p>2< < 5.6 pi (d>0< + 2d>1< + d>2<); - (vi) the wires of layers C1 and C2 are wound in the same direction of twist. In addition, the invention relates to semi-finished articles and products made of plastic and/or rubber reinforced by such a multi-layered steel cord, notably radial tyres and belt bracing plies therefor.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
D07B 1/0633 (2013.01 - EP US); Y10S 57/902 (2013.01 - EP US); Y10T 428/249934 (2015.04 - EP US)
Citation (search report)
See references of WO 02053827A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 02053827 A1 20020711; EP 1349983 A1 20031008; JP 2004527666 A 20040909; US 2004060275 A1 20040401; US 6766841 B2 20040727
DOCDB simple family (application)
EP 0115189 W 20011221; EP 01991875 A 20011221; JP 2002554316 A 20011221; US 61323803 A 20030703