EP0110437A1 - Composite cord for the reinforcement of elastomers - Google Patents
Composite cord for the reinforcement of elastomers Download PDFInfo
- Publication number
- EP0110437A1 EP0110437A1 EP83201453A EP83201453A EP0110437A1 EP 0110437 A1 EP0110437 A1 EP 0110437A1 EP 83201453 A EP83201453 A EP 83201453A EP 83201453 A EP83201453 A EP 83201453A EP 0110437 A1 EP0110437 A1 EP 0110437A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pitch
- wires
- cord
- strands
- group
- 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- Withdrawn
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2022—Strands coreless
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2059—Cores characterised by their structure comprising wires
- D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis
Definitions
- the invention relates to a steel cord for the reinforcement of an elastomer material, such as rubber, and comprising at least two strands.
- These strands can be arranged in the cord, e. g. as a given number n of strands which are twisted all together, the one around the other ones for forming helicoids of substantially same diameter and pitch.
- These strands can also be arranged in the form of one strand forming the core, and a layer of strands running helicoidally around the core strand.
- strands were used in the form of a group of m wires, which are twisted together and which form helicoids of same diameter and pitch, such as the strands 3 x 0.15 (3 wires of 0.15 mm diameter), 4 x 0.175, 4 x 0.22, having a pitch ranging from 15 to 25 millimeter. These strands are then twisted together into a cord, e.g. one core strand with six strands around it (7 strands of 3 or 4 wires each, i.e. a cord 7 x 3 or 4) or a cord having three strands twisted around each other (cord 3 x 3 or 4).
- a cord e.g. one core strand with six strands around it (7 strands of 3 or 4 wires each, i.e. a cord 7 x 3 or 4) or a cord having three strands twisted around each other (cord 3 x 3 or 4).
- this is obtained by using a special type strand, of which the structure is sufficiently round and compact to be used as a strand for forming a cord of acceptable diameter and roundness.
- each strand comprises two groups of wires, these groups being twisted around each other such as to form helicoids of about the same form, the wires of the first group having a pitch of more than 300 mm, and the wires of the second group having a pitch in the same sense and of the same value as the pitch of said helicoids.
- the number of wires of the second group is equal to the number of wires of the first group and ranges from two to four, preferably two.
- the twist pitch of the wires in the first group will preferably have an infinite value, such as to form in the strand a bundle of parallel wires.
- the wires have in general a diameter ranging from 0.10 to 0.40 mm.
- the strand used in the test explained hereunder, is shown in detail in Figure 1. It comprises a first group of two wires 1 and a second group of two wires 2. The two groups are twisted together the one around the other into helices having a pitch p.
- Figure 1 shows a side view and four'sections, taken at a quarter of a pitch distance from each other.
- the wires 1 of the first group have no twist around each other, and the wires 2 of the second group show a twist pitch p around each other and in the same sense and with the same twist pitch.
- a group of parallel wires 1 it is also possible to use a group of wires, twisted with a very high pitch, e.g. above 300 mm. Such strand is indicated by the symbol "2+2".
- Seven strands 2+2 of the type shown in Figure 1, are then used in a 7 x (2+2)-cord, as shown in Figure 2, in which the pitch q of the strands in the cord is in opposite sense of the pitch p of the groups of wires in the strands.
- the pitch q of the strands along the cord is to determine with respect to a direction AA which remains fixed along the cable.
- the pitches p and q have in general a value between 5 and 30 mm, preferably q about 10 mm and p about 20 mm.
- Such cord is called a 7 x (2+2)-cord having the pitches "10/20".
- cords can be made of the same type, for instance 3 x (2+2)-cords or others.
- a conventional 7x4 or 3x4-cord is in general further enveloped with a wire that helicoidally runs around the cable with a rather short pitch of about half or one third of the pitch of the strands and in a sense opposite to the pitch of the strands.
- This can also be done in a cord according to the invention, which is then called a 7 x (2+2) + 1-cord or a 3 x (2+2) + 1-cord having a pitch "q/p/r", r being the pitch, in mm, of the enveloping wire.
- the stiffness has been measured over a length section of 70 mm.
- the necessary bending moment M o is measured to incurve the length section by 15° over its length. Then the necessary bending moment M' o is measured to bring the specimen back to the straight form.
- the measurement is done according to the method of Taber and the moments are measured in Taber units (T.S.U.). With the specimen of 70 mm used, one Taber unit corresponds to 98,1 x 10-3 Nmm.
Abstract
Steel cord for the reinforcement of elastomer material, such as rubber, and comprising at least two strands. Each strand has a structure comprising two wire bundles (1, 2) twisted around each other to form two helicoids of same diameter and pitch. In the first bundle (1) the wires run in parallel, or nearly in parallel, and in the second bundle (2) the wires are twisted with a pitch (2) in the same sense and of the same value as the pitch (2) of said helicoids. A larger stiffness is obtained without remarkably increasing the cord diameter.
Description
- The invention relates to a steel cord for the reinforcement of an elastomer material, such as rubber, and comprising at least two strands. These strands can be arranged in the cord, e. g. as a given number n of strands which are twisted all together, the one around the other ones for forming helicoids of substantially same diameter and pitch. These strands can also be arranged in the form of one strand forming the core, and a layer of strands running helicoidally around the core strand.
- Up to now, strands were used in the form of a group of m wires, which are twisted together and which form helicoids of same diameter and pitch, such as the strands 3 x 0.15 (3 wires of 0.15 mm diameter), 4 x 0.175, 4 x 0.22, having a pitch ranging from 15 to 25 millimeter. These strands are then twisted together into a cord, e.g. one core strand with six strands around it (7 strands of 3 or 4 wires each, i.e. a cord 7 x 3 or 4) or a cord having three strands twisted around each other (cord 3 x 3 or 4).
- In certain oases of application of the cord, it is desirable to have at one's disposal a variant of the cord type mentioned hereabove, which shows about a similar structure with the same number of wires and the same tensile strength, but having other physical characteristics, e.g. a higher stiffness.
- According to the invention, this is obtained by using a special type strand, of which the structure is sufficiently round and compact to be used as a strand for forming a cord of acceptable diameter and roundness.
- According to the invention, each strand comprises two groups of wires, these groups being twisted around each other such as to form helicoids of about the same form, the wires of the first group having a pitch of more than 300 mm, and the wires of the second group having a pitch in the same sense and of the same value as the pitch of said helicoids.
- Preferably, the number of wires of the second group is equal to the number of wires of the first group and ranges from two to four, preferably two. The twist pitch of the wires in the first group will preferably have an infinite value, such as to form in the strand a bundle of parallel wires. The wires have in general a diameter ranging from 0.10 to 0.40 mm.
- The characteristics and advantages of the invention will appear from the description hereinafter, given by way of non-limitative example, and with the appended drawings in which :
- Figure 1 represents a cord used as a strand in the cord according to the invention.
- Figure 2 shows a section of a cord according to the invention and more specially the way in which the strands are joined to form the cord.
- The strand, used in the test explained hereunder, is shown in detail in Figure 1. It comprises a first group of two
wires 1 and a second group of twowires 2. The two groups are twisted together the one around the other into helices having a pitch p. Figure 1 shows a side view and four'sections, taken at a quarter of a pitch distance from each other. Thewires 1 of the first group have no twist around each other, and thewires 2 of the second group show a twist pitch p around each other and in the same sense and with the same twist pitch. Instead of a group ofparallel wires 1, it is also possible to use a group of wires, twisted with a very high pitch, e.g. above 300 mm. Such strand is indicated by the symbol "2+2". - Seven
strands 2+2 of the type shown in Figure 1, are then used in a 7 x (2+2)-cord, as shown in Figure 2, in which the pitch q of the strands in the cord is in opposite sense of the pitch p of the groups of wires in the strands. With the strand shown in Figure 1 (having a pitch in the "Z" sense), an "S/Z"-structure is so obtained. The pitch q of the strands along the cord is to determine with respect to a direction AA which remains fixed along the cable. The pitches p and q have in general a value between 5 and 30 mm, preferably q about 10 mm and p about 20 mm. Such cord is called a 7 x (2+2)-cord having the pitches "10/20". - Other cords can be made of the same type, for instance 3 x (2+2)-cords or others. A conventional 7x4 or 3x4-cord is in general further enveloped with a wire that helicoidally runs around the cable with a rather short pitch of about half or one third of the pitch of the strands and in a sense opposite to the pitch of the strands. This can also be done in a cord according to the invention, which is then called a 7 x (2+2) + 1-cord or a 3 x (2+2) + 1-cord having a pitch "q/p/r", r being the pitch, in mm, of the enveloping wire.
-
- The stiffness has been measured over a length section of 70 mm. The necessary bending moment Mo is measured to incurve the length section by 15° over its length. Then the necessary bending moment M'o is measured to bring the specimen back to the straight form. The measurement is done according to the method of Taber and the moments are measured in Taber units (T.S.U.). With the specimen of 70 mm used, one Taber unit corresponds to 98,1 x 10-3 Nmm.
-
- It can be concluded that the use of a 2+2-strand remarkably raises the stiffness of the cord, without remarkably raising its diameter.
Claims (5)
1. Steel cord for the reinforcement of an elastomer material, such as rubber, and comprising at least two strands, characterized in that each strand comprises two groups of wires, these groups being twisted around each other such as to form helicoids of about the same form, the wires of the first group having a pitch of more than 300 mm, and the wires of the second group having a pitch in the same sense and of the same value as the pitch of said helicoids.
2. Cord according to claim 1, characterized in that the number of wires in the second group is equal to the number of wires of the first group, and ranges from two to four.
3. Cord according to claim 2, characterized in that the pitch of the first group has an infinite value.
4. Cord according to claim 3, characterized in that each group comprises two wires.
5. Cord according to any one of the claims 1 to 4, characterized in that it comprises one core strand and six strands running helicoidally around the core strand, and with a pitch opposite to the pitch of the strands.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU84435A LU84435A1 (en) | 1982-10-22 | 1982-10-22 | COMPOUND CABLE FOR REPLACEMENT OF ELASTOMERS |
LU84435 | 1982-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0110437A1 true EP0110437A1 (en) | 1984-06-13 |
Family
ID=19729969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83201453A Withdrawn EP0110437A1 (en) | 1982-10-22 | 1983-10-11 | Composite cord for the reinforcement of elastomers |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0110437A1 (en) |
JP (1) | JPS59204992A (en) |
LU (1) | LU84435A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2569143A1 (en) * | 1984-08-14 | 1986-02-21 | Bridgestone Corp | ARMATURE FOR RUBBER |
EP0430851A1 (en) * | 1989-11-07 | 1991-06-05 | The Goodyear Tire & Rubber Company | Belt reinforced pneumatic radial tire |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02175983A (en) * | 1988-12-28 | 1990-07-09 | Yokohama Rubber Co Ltd:The | Radial tire and steel cord for tire reinforcement |
ZA901611B (en) * | 1989-04-03 | 1990-12-28 | Bekaert Sa Nv | Steel cord with improved fatigue strength |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE622904A (en) * | ||||
FR997343A (en) * | 1945-07-13 | 1952-01-04 | Dunlop Sa | Improvements to cables applicable in particular to pneumatic tire casings |
US2900785A (en) * | 1956-05-18 | 1959-08-25 | United States Steel Corp | Six-wire strand |
EP0040877A1 (en) * | 1980-05-26 | 1981-12-02 | Gencord S.p.A. | Metal wire cord having strands with parallel filaments |
LU84130A1 (en) * | 1981-05-08 | 1982-09-13 | Bekaert Sa Nv | STEEL CABLE FOR THE REINFORCEMENT OF AN ELASTOMERIC MATERIAL, PARTICULARLY FOR PNEUMATIC TIRES |
DE2619086C2 (en) * | 1975-05-12 | 1982-10-28 | Akzo Gmbh, 5600 Wuppertal | Reinforcement rope for elastomer products, method and apparatus for manufacture |
EP0092696A2 (en) * | 1982-04-26 | 1983-11-02 | Akzo GmbH | Reinforcing cord for rubber products |
-
1982
- 1982-10-22 LU LU84435A patent/LU84435A1/en unknown
-
1983
- 1983-10-11 EP EP83201453A patent/EP0110437A1/en not_active Withdrawn
- 1983-10-21 JP JP58197485A patent/JPS59204992A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE622904A (en) * | ||||
FR997343A (en) * | 1945-07-13 | 1952-01-04 | Dunlop Sa | Improvements to cables applicable in particular to pneumatic tire casings |
US2900785A (en) * | 1956-05-18 | 1959-08-25 | United States Steel Corp | Six-wire strand |
DE2619086C2 (en) * | 1975-05-12 | 1982-10-28 | Akzo Gmbh, 5600 Wuppertal | Reinforcement rope for elastomer products, method and apparatus for manufacture |
EP0040877A1 (en) * | 1980-05-26 | 1981-12-02 | Gencord S.p.A. | Metal wire cord having strands with parallel filaments |
LU84130A1 (en) * | 1981-05-08 | 1982-09-13 | Bekaert Sa Nv | STEEL CABLE FOR THE REINFORCEMENT OF AN ELASTOMERIC MATERIAL, PARTICULARLY FOR PNEUMATIC TIRES |
EP0092696A2 (en) * | 1982-04-26 | 1983-11-02 | Akzo GmbH | Reinforcing cord for rubber products |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2569143A1 (en) * | 1984-08-14 | 1986-02-21 | Bridgestone Corp | ARMATURE FOR RUBBER |
EP0430851A1 (en) * | 1989-11-07 | 1991-06-05 | The Goodyear Tire & Rubber Company | Belt reinforced pneumatic radial tire |
Also Published As
Publication number | Publication date |
---|---|
LU84435A1 (en) | 1984-05-10 |
JPS59204992A (en) | 1984-11-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19850214 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: VANCOLEN, PIERRE |