CA1260812A - Tire cord fabric with greater twist cords in the selvedge area - Google Patents
Tire cord fabric with greater twist cords in the selvedge areaInfo
- Publication number
- CA1260812A CA1260812A CA000489668A CA489668A CA1260812A CA 1260812 A CA1260812 A CA 1260812A CA 000489668 A CA000489668 A CA 000489668A CA 489668 A CA489668 A CA 489668A CA 1260812 A CA1260812 A CA 1260812A
- Authority
- CA
- Canada
- Prior art keywords
- selvedge
- portions
- warp cords
- twist
- tire cord
- 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.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D5/00—Selvedges
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
- D03D15/41—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads with specific twist
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0042—Reinforcements made of synthetic materials
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/48—Tyre cords
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
- D10B2505/02—Reinforcing materials; Prepregs
- D10B2505/022—Reinforcing materials; Prepregs for tyres
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improved cord fabric suitable for reinforce-ment of rubber tires is disclosed. The fabric is comprised of a plurality of bodies and at least one splice. Each body is composed by two selvedge portions and a remaining central portion and contains a large number of warp cords arranged side by side and parallel to the selvedge portions. The warp cords are relatively coarsely interlaced with weft yarns. The splice is formed by overlapping the selvedge portion of one body with the selvedge portion of an adjoining body. The improvement is that each of the selvedge portions has warp cords with a degree of twist at least three times as high as the degree of twist of the warp cords in the central portions. The tire fabric is useful for improving the uniformity of radial tires and for reducing considerably the indentations in the tire sidewalls in the areas of the splices.
An improved cord fabric suitable for reinforce-ment of rubber tires is disclosed. The fabric is comprised of a plurality of bodies and at least one splice. Each body is composed by two selvedge portions and a remaining central portion and contains a large number of warp cords arranged side by side and parallel to the selvedge portions. The warp cords are relatively coarsely interlaced with weft yarns. The splice is formed by overlapping the selvedge portion of one body with the selvedge portion of an adjoining body. The improvement is that each of the selvedge portions has warp cords with a degree of twist at least three times as high as the degree of twist of the warp cords in the central portions. The tire fabric is useful for improving the uniformity of radial tires and for reducing considerably the indentations in the tire sidewalls in the areas of the splices.
Description
~2i~0812 TIRE CORD FABRIC WITH GREATER
TWIST CORDS IN THE SELVEDGE AREA
The presen-t invention relates to tire cord fabrics suitable for reinforcement of radial tires and more particularly to such tire cord fabrics in which the degree of twist in the warp cords in the selvedge areas is at least three times greater than the degree of twist in the warp cords in the body of the tire cord fabric.
Tire cord fabrics are widely used as reinforcing mem~ers for rubber tires. In the reinforcement of radial tires, the tire cord fabric is often composed of thick cords, for example 1880 to 4200 dtex, as warp cords and common spun yarns as weft yarns. The warp density is usually in the range of from about 5 to 14 cords/cm over a width of about 1.5 m and the weft density i3 usually in the range of from about 2 to 100 yarns/m. The overall length of this tire cord fabric, referred to sometimes hereinafter as a roll of intermediate material, is usually about 1000 to 3000 m.
In preparing tire cord fabric for use in constructing tire carcasses Eor radial tires, pieces of the fabric of a length sufficient to run Erom bead to bead of the tire and to provide for the required "turn-ups" are cut off the roll of intermediate material at an angle of 90 to the direct.ion of the warp cords. These pieces, subsequently, may be spliced together, the selvedge portion of one piece overlapping the selvedge portion of the next piece, to produce a new roll of tire cord fabric with the warp cords running transverse to the length of the roll.
In recent years the number of plies used in tire construction has been greatly reduced, for example, monoply tires are now being produced, in order to achieve better performance, especially to provide a softer ride and lower heat build up.
.
~_ 0~
~ .
~126(~ 2 If identical warp cords and the same number of warp cords/cm are used in the selvedge portions as in the remainder of the fabric, the resistance to stress in the area of the selvedge to selvedge overlap splice is much greater than the resistance to stres.s in -the remainder of the tire cord fabric. When tire cord fabric containing such a splice is used as a carcass ply in a two ply or especially a monoply radial tire, the splice area affects tire uniformity (i.e. tire run out or force variation) and also manifests itself as an unsightly indentation in the sidewall of the tire when the tire is in1ated. The indentation appears because the higher resistance to stress in the splice area does not allow the tlre to expand as much in that area.
Canadian Patent 1 096 273 of Saito et al., issued 1981 February 24 and a division thereof, Canadian Patent 1 105 808, issued 1981 July 26, disclose two techniques for improving tire uniformity by reducing the thickness of the spl:ice areas. One technique is to make tire cord fabrics with selvedge portions having warp cords each with a diameter ~0% to 80% of the diameter of the warp cords in the remainder of the tire fabric and the other technique is to make tire cord fabric having a substantially lower number of warp cords in the selvedge portions than in the remainder of the fabric.
It is often inconvenient and/or expensive to produce tire cord fabrics having selvedge portions with lower diameter warp cords or with a lower number of warp cords/cm than the remainder of the tire cord fabric.
Surprisingly, it has now been found that tire uniformity may be greatly improved and the indentation in the tire sidewall greatly reduced, if the selvedge portions of the tire cord fabric in the splice area are formed by warp cords each having a degree of twist at least three times as high as the degree of twist of the warp cords in ~z~o~
the remainder of the tire cord fabric.
Accorclingly, the present invention provides in a tire cord fabrlc suitable for reinforcement of rubber tires, the fabric comprising a plurality oE bodies and at least one splice, each body being composed of two selvedge portions and a rernaining central portion and containing therein a large number oE warp cords arranged side by side and parallel to the selvedge portions, the warp cords being relatively coarsely interlaced with weft yarns, said splice being formed by overlapping the selvedge portion of one body with the selvedge portion of an adjoining body, the improvement comprising each of the selvedge portions having warp cords with a degree oE twist at least three times as high as the degree of twist of the warp cords in the central portions.
In an embodiment of the tire cord fabric of the present invention, the degree of twist in the warp cords in each selvedge portion is in the range of from three to six times the degree of twist in the warp cords in the central portion.
In other embodiments oE the tire cord fabric of the present invention, the splice has a width in the range of ~Erom 'i mm to 15 mm and especially a width of about lO rnm.
In further embodlments of the tire cord fabric of the present invention, the bodies are rubberized bodies.
The present invention also provides a tire cord fabric suitable for reinforcement of rubber tires, the fabric comprising: a first body, a second body and a splice joining the two bodies, the first body being composed of two selvedge portions and a remaining central portion and the second body being composed of one selvedge portion and a remaining portion having an edge opposite the selvedge portion, the ~two bodies containing a large number of warp cords arranged side by side and parallel to the selvedge 1~6~312 portions, -the warp cords being relatively coarsely interlaced with wet yarns, the splice being formed by overlapping one selvedge portion of the first body with the edge opposite the selvedge portion of the second body, each of the selvedge portions having warp cords with a degree of twist at least three times as high as the degree of twist of the warp cords in the remaining portions of the two bodies, the splice having a width in the range of from 5 mm to 15 mm.
In an embodiment of the tire cord fabric of the present invention, the degree of twist in the warp cords in each selvedge portion is in the range of rom three to six times the dlegree oE twist in the warp cords in the remaining portions of the two bodies.
In another embodiment of the tire cord fabric of the present invention, the warp cords in each selvedge portion have a diameter in the range of from 82% -to 99% of the diameter of the warp cords in the remaining portions of the two bodies.
In yet another embodiment oE the tire cord fabric of the present invention, the splice has a width of about 10 mm.
In further embodiments of the tire cord fabric oE
the present invention, the two bodies are rubberized bodies.
Tire cord fabrics of the present invention may be manuEactured from continuous filament yarns of, for example, nylon, polyester, rayon and mixtures thereof. Particularly suitable nylon yarns are nylon 6 yarns and nylon 66 yarns.
The tire cords are usually made up by combining and twisting together at least two yarns. The yarns may contain twist or may contain no twist. If the yarns contain twist they are usually twiste!d together in the opposite twist direction to form the tire cords. The "degree of twist" of a tire cord as used herein means the number of turns/cm which are ~:60~2 applied in twisting -the yarns together to form the cord.
In making the tire cord fabric, it is preferable that fabric first be made up as a roll oE in-termediate ~ material having, for example, a width of about 1.5 m and a ri 5 length of about 1000 to 3000 m. In making a roll of intermediate material, the tire cords, which are thick cords, for example 1880 to 4200 dtex, are used as warp cords and common spun yarns are used as weft yarns.
The warp density is preferably in the range of from 5 to 14 cords/cm, especially 11 cords/cm and the weft ~, density is preferably in the range of from 20 to 100 i yarns/m. Selvedge portions, preferably having a width offrom 5 mm to 15 mm, more preferably a width of from 8 mm to 12 mm and especially a width of about 10 mm, are provided at each edge of the roll of intermediate material. In the selvedge portions of the roll of intermediate material, the warp cords, which run parallel to the selvedge portions, have a degree of twist at least three times as high, and pre!ferably from three to six times as high, as the degree of twist in the warp cords in the remaining portion.
Before the roll of intermediate material is used to make t:ire cord fabric of the present invention, it is pre!ferrecl that the intermediate material be rubberized. The rubberizing of the intermediate material may be carried out as 011O~8: (1) an adhesive is applied to the material and the material is then heat treated under conditions as required to stabilize its properties; and (2) the material is then coated with an unvulcanized coating rubber.
Pieces of fabric of a length sufficient to run from bead to bead of a tire and to provide for the required "turn-ups" are cut off the roll of intermediate material at an angle of 90 to the direction of the warp cords.
In an embodiment of the tire cord fabric of the present invention, the pieces of fabric, subsequently, are spliced toget:her, the selvedge portion of one piece :
: ~ ' ~2608~
overlapping -the selvedge portion of the next piece, to produce a new roll of tire corcl fabrlc with the warp cords runnin~ transverse to the length of the roll. The width of each splice is preferably the same as the width of each selvedge portion i.e. preferably from 5 mm to 15 mm, more preferab]y from 8 mm to 12 mm and especially about 10 mm.
This tire cord fabric is useful in the construction of tire carcasses for radial tires.
In another embodiment of the tire cord fabric of the present invention, the pieces of fabric cut off the roll of intermedia-te material are not spliced together selvedge portion to selveclge portion to form a new roll of fabric.
Instead these pieces (pieces A i.e. Al, A2, etc.) are used to make new pieces (pieces B i.e. Bl, B2, etc.). The new pieces B may be prepared as follows: (1) a first new piece, Bl, is cut off from piece Al to the required length; (2) the remaining portion of piece Al is spliced to piece A2, the cut off edge overlapping a selvedge portion of piece A2; (3) a second new piece, B2 is cut off from the joined material such that piece B2 contains the splice; (4) the remaining portion of piece A2 is then spliced to piece A3 and the procedure is repeated to produce a number of piece~ B most of which contain a selvedge portion to body material splice.
The width of each splice is preferably the same as khe width o each selvedge portion, i.e. preferably from 5 mm to lS
mm, more preferably from 8 mm to 12 mm and especially about 10 mm. In making such pieces B, it may be advantageous for the warp cords in the selvedge portions of the roll of intermediate material from which pieces A are cut ~o also have a diameter in the range of from 82% to 99% of the diameter of the warp cords in the remaining portion of the intermediate material. These pieces B of tire cord fabric are also useful in the construction of tire carcasses for radial tires.
The present invention is il:Lustrated by the ~26(~
following examples:
EXAMPLE I
An intermediate material having two selvedge portions and a body portion was made up and ruhberized, as discussed hereinbefore. Some characteristics of the intermedi.ate material were as follows:
Selvedge Portions warp cord: nylon 66 cord of 2800 dtex formed from two 1~00 dtex nylon 66 yarns, each having a twist of four turns/cm in the same twist direction, by combining and twisting the two yarns together at our turns/cm in the opposite twist direction to produce cord with a degree of twist of four turns/cm.
15 warp density: 11 cords/cm width of each selvedge portion: 10 mm Body Portion warp cord: nylon 66 cord of 2800 dtex formed from two 1~00 dtex nylon 66 yarns, each having no twist, by combining and twis-ting the two yarns together at one turn/cm to produce a cord with a degree of twist of one turn/cm.
warp density: 11 cords/cm From the above it is apparent that the warp cords in the selvedge portions have a degree of twist equal to four times the degree of twist of the warp cords in the body portion.
Pieces of fabric of a length sufficient to run from bead to bead of a particular size of radial tire and to provide for the required "turn-ups" were cut from the intermediate material at an angle of 90 to the direction of the warp cords. These pieces of fabric were then spliced together, the selvedge portion of one piece overlapping the selvedge portion of the next piece, to produce a new fabric with the warp cords running transverse to the length of the .
. . .
" ' ' ., ' '''~
., - ~2160~
fabric. The width of each splice in -the cord fabric was 10 mm.
A number o lengths of new fabric were used for the carcasses of radial tires as follows:
Tir,e size: FR 78-14 (radial construction) Carcass Ply: monoply Tests on two o the above tires each containing tire cord fabric according to the present invention with a selvedge portion to selvedge portion splice revealed that:
(1) the uniformity of the tires was acceptable as indicated by radial load variation measurements.
TWIST CORDS IN THE SELVEDGE AREA
The presen-t invention relates to tire cord fabrics suitable for reinforcement of radial tires and more particularly to such tire cord fabrics in which the degree of twist in the warp cords in the selvedge areas is at least three times greater than the degree of twist in the warp cords in the body of the tire cord fabric.
Tire cord fabrics are widely used as reinforcing mem~ers for rubber tires. In the reinforcement of radial tires, the tire cord fabric is often composed of thick cords, for example 1880 to 4200 dtex, as warp cords and common spun yarns as weft yarns. The warp density is usually in the range of from about 5 to 14 cords/cm over a width of about 1.5 m and the weft density i3 usually in the range of from about 2 to 100 yarns/m. The overall length of this tire cord fabric, referred to sometimes hereinafter as a roll of intermediate material, is usually about 1000 to 3000 m.
In preparing tire cord fabric for use in constructing tire carcasses Eor radial tires, pieces of the fabric of a length sufficient to run Erom bead to bead of the tire and to provide for the required "turn-ups" are cut off the roll of intermediate material at an angle of 90 to the direct.ion of the warp cords. These pieces, subsequently, may be spliced together, the selvedge portion of one piece overlapping the selvedge portion of the next piece, to produce a new roll of tire cord fabric with the warp cords running transverse to the length of the roll.
In recent years the number of plies used in tire construction has been greatly reduced, for example, monoply tires are now being produced, in order to achieve better performance, especially to provide a softer ride and lower heat build up.
.
~_ 0~
~ .
~126(~ 2 If identical warp cords and the same number of warp cords/cm are used in the selvedge portions as in the remainder of the fabric, the resistance to stress in the area of the selvedge to selvedge overlap splice is much greater than the resistance to stres.s in -the remainder of the tire cord fabric. When tire cord fabric containing such a splice is used as a carcass ply in a two ply or especially a monoply radial tire, the splice area affects tire uniformity (i.e. tire run out or force variation) and also manifests itself as an unsightly indentation in the sidewall of the tire when the tire is in1ated. The indentation appears because the higher resistance to stress in the splice area does not allow the tlre to expand as much in that area.
Canadian Patent 1 096 273 of Saito et al., issued 1981 February 24 and a division thereof, Canadian Patent 1 105 808, issued 1981 July 26, disclose two techniques for improving tire uniformity by reducing the thickness of the spl:ice areas. One technique is to make tire cord fabrics with selvedge portions having warp cords each with a diameter ~0% to 80% of the diameter of the warp cords in the remainder of the tire fabric and the other technique is to make tire cord fabric having a substantially lower number of warp cords in the selvedge portions than in the remainder of the fabric.
It is often inconvenient and/or expensive to produce tire cord fabrics having selvedge portions with lower diameter warp cords or with a lower number of warp cords/cm than the remainder of the tire cord fabric.
Surprisingly, it has now been found that tire uniformity may be greatly improved and the indentation in the tire sidewall greatly reduced, if the selvedge portions of the tire cord fabric in the splice area are formed by warp cords each having a degree of twist at least three times as high as the degree of twist of the warp cords in ~z~o~
the remainder of the tire cord fabric.
Accorclingly, the present invention provides in a tire cord fabrlc suitable for reinforcement of rubber tires, the fabric comprising a plurality oE bodies and at least one splice, each body being composed of two selvedge portions and a rernaining central portion and containing therein a large number oE warp cords arranged side by side and parallel to the selvedge portions, the warp cords being relatively coarsely interlaced with weft yarns, said splice being formed by overlapping the selvedge portion of one body with the selvedge portion of an adjoining body, the improvement comprising each of the selvedge portions having warp cords with a degree oE twist at least three times as high as the degree of twist of the warp cords in the central portions.
In an embodiment of the tire cord fabric of the present invention, the degree of twist in the warp cords in each selvedge portion is in the range of from three to six times the degree of twist in the warp cords in the central portion.
In other embodiments oE the tire cord fabric of the present invention, the splice has a width in the range of ~Erom 'i mm to 15 mm and especially a width of about lO rnm.
In further embodlments of the tire cord fabric of the present invention, the bodies are rubberized bodies.
The present invention also provides a tire cord fabric suitable for reinforcement of rubber tires, the fabric comprising: a first body, a second body and a splice joining the two bodies, the first body being composed of two selvedge portions and a remaining central portion and the second body being composed of one selvedge portion and a remaining portion having an edge opposite the selvedge portion, the ~two bodies containing a large number of warp cords arranged side by side and parallel to the selvedge 1~6~312 portions, -the warp cords being relatively coarsely interlaced with wet yarns, the splice being formed by overlapping one selvedge portion of the first body with the edge opposite the selvedge portion of the second body, each of the selvedge portions having warp cords with a degree of twist at least three times as high as the degree of twist of the warp cords in the remaining portions of the two bodies, the splice having a width in the range of from 5 mm to 15 mm.
In an embodiment of the tire cord fabric of the present invention, the degree of twist in the warp cords in each selvedge portion is in the range of rom three to six times the dlegree oE twist in the warp cords in the remaining portions of the two bodies.
In another embodiment of the tire cord fabric of the present invention, the warp cords in each selvedge portion have a diameter in the range of from 82% -to 99% of the diameter of the warp cords in the remaining portions of the two bodies.
In yet another embodiment oE the tire cord fabric of the present invention, the splice has a width of about 10 mm.
In further embodiments of the tire cord fabric oE
the present invention, the two bodies are rubberized bodies.
Tire cord fabrics of the present invention may be manuEactured from continuous filament yarns of, for example, nylon, polyester, rayon and mixtures thereof. Particularly suitable nylon yarns are nylon 6 yarns and nylon 66 yarns.
The tire cords are usually made up by combining and twisting together at least two yarns. The yarns may contain twist or may contain no twist. If the yarns contain twist they are usually twiste!d together in the opposite twist direction to form the tire cords. The "degree of twist" of a tire cord as used herein means the number of turns/cm which are ~:60~2 applied in twisting -the yarns together to form the cord.
In making the tire cord fabric, it is preferable that fabric first be made up as a roll oE in-termediate ~ material having, for example, a width of about 1.5 m and a ri 5 length of about 1000 to 3000 m. In making a roll of intermediate material, the tire cords, which are thick cords, for example 1880 to 4200 dtex, are used as warp cords and common spun yarns are used as weft yarns.
The warp density is preferably in the range of from 5 to 14 cords/cm, especially 11 cords/cm and the weft ~, density is preferably in the range of from 20 to 100 i yarns/m. Selvedge portions, preferably having a width offrom 5 mm to 15 mm, more preferably a width of from 8 mm to 12 mm and especially a width of about 10 mm, are provided at each edge of the roll of intermediate material. In the selvedge portions of the roll of intermediate material, the warp cords, which run parallel to the selvedge portions, have a degree of twist at least three times as high, and pre!ferably from three to six times as high, as the degree of twist in the warp cords in the remaining portion.
Before the roll of intermediate material is used to make t:ire cord fabric of the present invention, it is pre!ferrecl that the intermediate material be rubberized. The rubberizing of the intermediate material may be carried out as 011O~8: (1) an adhesive is applied to the material and the material is then heat treated under conditions as required to stabilize its properties; and (2) the material is then coated with an unvulcanized coating rubber.
Pieces of fabric of a length sufficient to run from bead to bead of a tire and to provide for the required "turn-ups" are cut off the roll of intermediate material at an angle of 90 to the direction of the warp cords.
In an embodiment of the tire cord fabric of the present invention, the pieces of fabric, subsequently, are spliced toget:her, the selvedge portion of one piece :
: ~ ' ~2608~
overlapping -the selvedge portion of the next piece, to produce a new roll of tire corcl fabrlc with the warp cords runnin~ transverse to the length of the roll. The width of each splice is preferably the same as the width of each selvedge portion i.e. preferably from 5 mm to 15 mm, more preferab]y from 8 mm to 12 mm and especially about 10 mm.
This tire cord fabric is useful in the construction of tire carcasses for radial tires.
In another embodiment of the tire cord fabric of the present invention, the pieces of fabric cut off the roll of intermedia-te material are not spliced together selvedge portion to selveclge portion to form a new roll of fabric.
Instead these pieces (pieces A i.e. Al, A2, etc.) are used to make new pieces (pieces B i.e. Bl, B2, etc.). The new pieces B may be prepared as follows: (1) a first new piece, Bl, is cut off from piece Al to the required length; (2) the remaining portion of piece Al is spliced to piece A2, the cut off edge overlapping a selvedge portion of piece A2; (3) a second new piece, B2 is cut off from the joined material such that piece B2 contains the splice; (4) the remaining portion of piece A2 is then spliced to piece A3 and the procedure is repeated to produce a number of piece~ B most of which contain a selvedge portion to body material splice.
The width of each splice is preferably the same as khe width o each selvedge portion, i.e. preferably from 5 mm to lS
mm, more preferably from 8 mm to 12 mm and especially about 10 mm. In making such pieces B, it may be advantageous for the warp cords in the selvedge portions of the roll of intermediate material from which pieces A are cut ~o also have a diameter in the range of from 82% to 99% of the diameter of the warp cords in the remaining portion of the intermediate material. These pieces B of tire cord fabric are also useful in the construction of tire carcasses for radial tires.
The present invention is il:Lustrated by the ~26(~
following examples:
EXAMPLE I
An intermediate material having two selvedge portions and a body portion was made up and ruhberized, as discussed hereinbefore. Some characteristics of the intermedi.ate material were as follows:
Selvedge Portions warp cord: nylon 66 cord of 2800 dtex formed from two 1~00 dtex nylon 66 yarns, each having a twist of four turns/cm in the same twist direction, by combining and twisting the two yarns together at our turns/cm in the opposite twist direction to produce cord with a degree of twist of four turns/cm.
15 warp density: 11 cords/cm width of each selvedge portion: 10 mm Body Portion warp cord: nylon 66 cord of 2800 dtex formed from two 1~00 dtex nylon 66 yarns, each having no twist, by combining and twis-ting the two yarns together at one turn/cm to produce a cord with a degree of twist of one turn/cm.
warp density: 11 cords/cm From the above it is apparent that the warp cords in the selvedge portions have a degree of twist equal to four times the degree of twist of the warp cords in the body portion.
Pieces of fabric of a length sufficient to run from bead to bead of a particular size of radial tire and to provide for the required "turn-ups" were cut from the intermediate material at an angle of 90 to the direction of the warp cords. These pieces of fabric were then spliced together, the selvedge portion of one piece overlapping the selvedge portion of the next piece, to produce a new fabric with the warp cords running transverse to the length of the .
. . .
" ' ' ., ' '''~
., - ~2160~
fabric. The width of each splice in -the cord fabric was 10 mm.
A number o lengths of new fabric were used for the carcasses of radial tires as follows:
Tir,e size: FR 78-14 (radial construction) Carcass Ply: monoply Tests on two o the above tires each containing tire cord fabric according to the present invention with a selvedge portion to selvedge portion splice revealed that:
(1) the uniformity of the tires was acceptable as indicated by radial load variation measurements.
(2) the splice indentations in the sidewalls of the tires were also acceptable ranging from 0 mm to 0.14 mm in depth when the tires were inElated to 275 kPa.
EXAMPLE II
An intermediate material having two selvedge portions and a body portion was made, rubberized and wound up as a roll. Some characteristics o the roll of intermediate material were as ollows:
Selvedge Portions warp cord: same as in EXAMPLE I
warp density: same as in EXAMPLE I
width o each selvedge portion: 12.7 mm Body Portion warp cord: same as in EXAMPLE I
warp density same as in EXAMPLE I
From the above it is apparent that the warp cords in the selvedge portions have a degree of twist equal to four times the degree of twist of the warp cords in the body portion.
A number of pieces of fabric were cut off the -i2~0812 roll of in-termedlate materlal as described in EXAMPLE I but, were not spliced together selvedge -to selvedge as described in EXAMPLE I. Instead these pieces (pieces A i.e. Al, A2, etc.) were used to make new pieces (pieces ~ i.e. Bl, B2, etc.) each having a length as required for the particular size of tire. The new pieces B were prepared as follows:
(1) a first new piece,(Bl) was cut off from piece Al at the required length; (2) the remaining portion of piece Al was spliced to piece A2, the cut off edge overlapping a selvedge portion of piece A2; (3) a second new piece, s2, was cut off the joined material such that piece B2 contained the splice;
(4) the remaining portion of piece A2 was then spliced to p:Lece A3 and the procedure was repeated to produce a number of pieces B most of which contained a splice. The width of each splice was 12.7 mm.
New pieces B were used for the carcasses of radial tires as follows:
Tire size: P 195-75 R 14 (radial construction) Carcass Ply: monoply Testing and inspection of two of the above tires each conta:Lning tire cord fabric according to the present inve~ntion with a selvedge portion to body portion splice reve:aled that:
~1) the uniformity of the tires wa~ considered to be acceptable after visual inspection by persons experienced in the manufacture of radial tires.
(2) the splice indentations in the sidewalls of the tires were also acceptable ranging in depth from 18 units to 23 units on a scale in which 25 units or less is rated acceptable; this scale of measurement being different from that used in EXAMPLE I.
EXAMPLE III
An intermediate material having two selvedge ., - .
, ~ ~ .
~6()~1L2 portions and a body portion was made, rubberized and wound up as a roll. Some characteristics of the roll of intermediate material were as follows:
Selved~e Portions warp cord: nylon 66 cord of 1880 dtex formed from two 940 dtex nylon 66 yarns, each having a twist of 4.7 turns/cm in the same twist direction, by combining and twisting the two yarns together at 4.7 turns/cm in the opposite twist direction to produce cord with a degree of twist of 4.7 turns/cm.
warp cord diameter: 0.53 mm warp density: 11 cords/cm width of selvedge portion: 10 mm Body Portion warp cord: same as in EXAMPLES I & II
warp cord diameter: 0.625 mm warp denstiy: same as in EXAMPLES I & II
From the above it is apparent that the warp cords in the selvedge portions have a degree of twi~t equal to 4.7 times the degree of twist of the warp cords in the body portion and that the warp cords in the selvedge portions have a diamenter equal to 85% of the diameter of the warp cord~ in the body portion.
A number of pieces of fabric of length sufficient to run from bead to bead of a particular size of tire and to provide for the required "turn ups" were cut off the roll of intermediate material at an angle of 90 to the direction of the warp cords. These pieces of fabric (pieces A) were used to make new pieces (pieces B) each having a length as required for the particular size of tire as described in EXAMPLE II. The width of each splice was 10 mm.
The new pieces B were used for the carcasses of radial tires as follows:
.
12f~31Z
Tire Size: FR 78-14 (radial construction) Carcass Ply: monoply Tests on two of the above tires each containing tire cord fabric of the present invention with a selvedge portion t:o body portion splice revealed that:
(1) the uniformity of the tires was acceptable as indicated by radial load variation measurements.
(2) the splice indentations in the sidewalls of the tires were also acceptable ranging from 0.20 mm to 0.30 mm in depth when the tires were inflated to 275 kPa.
EXAMPLE IV
As a comparison, an intermediate material having two selvedge portions and a body portion was made, rubberized and wound up as a roll. The characteristics of the roll of intermediate material were the same as described in ~SXAMPLE I except that the same tire cord was used as warp cord in selvedge portions as in the body portion. These characteristics were as follows:
Sel~redge Portion wl~rp cord: same as in EXAMPLE I, degree oE twist of four turn~/cm wl~rp density: 11 cords/cm (same as in EXAMPLE I) wLdth oP each selvedge portion: 10 mm (same as in EXAMPLE I) Body Portion warp cord: Same as in selvedge portion (see above), degree of twist of four turns/cm warp density: 11 cords/cm (same as in selvedge portion) From the above it is apparent that the warp cords in the selvedge portions have a degree of twist the same as, i.e. one times the degree of twist of the warp cords in the body portion.
.
.. .
.: , , 1~6~812 A number of pieces of fabric were cut off the roll of intermediate ma-terial a~ describ~d in FIXAMPLE I.
These pieces of fabric were then spliced together as described in EXAMPLE I. The width o~ each splice in the new roll of fabric was 10 mm.
Lengths were cut from the roll of new fabric and used for the carcasses of radial tires as follows:
Tire size: ER78-l4 (radial construction) Carcass Ply: monoply Tests on two of the above tires each containing tire cord ~abric with a selvedge portion to selvedge portion splice, but outside the scope of the present invention revealed that:
(1) non-uniformities in the tires were apparent as indicated by the radial load variation of tires being two times that of the tires produced in EXAMPLES I and III.
(2) the splice indentations in the sidewalls of the tires were unacceptable ranging from 0.61mm to 0.69 mm in depth when the tires were inflated to 275 kPa.
EXAMPLE V
As a further comparison, an intermediate material having two selvedge portions and a body portion was made, rubberizecl and wound up as a roll. The characteristics of the roll of intermediate material were the same as described in EXAMPLE II except that the same tire cord was used as warp cord in the selvedge porti.ons as in the body portion.
These characteristics were as follows:
Selvedge Portion warp cord: same as in EXAMPLES I & II, degree of twist of four turns/cm warp density: 11 cords/cm width of eac!h 35 selvedge porti.on: 12.7 cm ~z6asl2 Body Portion warp cord: same as in selvedge portion warp density: 11 cords/cm From the above it is apparen-t that the warp cords in the selvedge portions have a degree of twist the same as, i.e. one times the degree of twist of the warp cords in the body portion.
A number of pieces of fabric were cut off the roll of intermediate material as described in EXAMPLE II. A
number o~ these pieces of fabric were then spl.iced together.
The width of each splice in the new fabric was 12.7 mm.
Lengths of new fabric were used for the carcasses o radial tires as follows:
Tire size: FR78-14 Carcass Ply: monoply Tests on two of the above tires each containing tire cord fabric with a selvedge portion to body portion splice, but outside the scope of the present invention revealed that:
(1) non-uniformit.ies in the tires were apparent as indicated by indentations visible in the sidewall rated objectionable by persons experienced in radial tire manuEacture.
(2) The splice indentations in the sidewalls of the tires were unacceptable and in excess of S0 units in depth on a scale in which 25 units or :less is rated acceptable; this measurement scale being different from that used in EXAMPLES I., III and IV.
EXAMPLE II
An intermediate material having two selvedge portions and a body portion was made, rubberized and wound up as a roll. Some characteristics o the roll of intermediate material were as ollows:
Selvedge Portions warp cord: same as in EXAMPLE I
warp density: same as in EXAMPLE I
width o each selvedge portion: 12.7 mm Body Portion warp cord: same as in EXAMPLE I
warp density same as in EXAMPLE I
From the above it is apparent that the warp cords in the selvedge portions have a degree of twist equal to four times the degree of twist of the warp cords in the body portion.
A number of pieces of fabric were cut off the -i2~0812 roll of in-termedlate materlal as described in EXAMPLE I but, were not spliced together selvedge -to selvedge as described in EXAMPLE I. Instead these pieces (pieces A i.e. Al, A2, etc.) were used to make new pieces (pieces ~ i.e. Bl, B2, etc.) each having a length as required for the particular size of tire. The new pieces B were prepared as follows:
(1) a first new piece,(Bl) was cut off from piece Al at the required length; (2) the remaining portion of piece Al was spliced to piece A2, the cut off edge overlapping a selvedge portion of piece A2; (3) a second new piece, s2, was cut off the joined material such that piece B2 contained the splice;
(4) the remaining portion of piece A2 was then spliced to p:Lece A3 and the procedure was repeated to produce a number of pieces B most of which contained a splice. The width of each splice was 12.7 mm.
New pieces B were used for the carcasses of radial tires as follows:
Tire size: P 195-75 R 14 (radial construction) Carcass Ply: monoply Testing and inspection of two of the above tires each conta:Lning tire cord fabric according to the present inve~ntion with a selvedge portion to body portion splice reve:aled that:
~1) the uniformity of the tires wa~ considered to be acceptable after visual inspection by persons experienced in the manufacture of radial tires.
(2) the splice indentations in the sidewalls of the tires were also acceptable ranging in depth from 18 units to 23 units on a scale in which 25 units or less is rated acceptable; this scale of measurement being different from that used in EXAMPLE I.
EXAMPLE III
An intermediate material having two selvedge ., - .
, ~ ~ .
~6()~1L2 portions and a body portion was made, rubberized and wound up as a roll. Some characteristics of the roll of intermediate material were as follows:
Selved~e Portions warp cord: nylon 66 cord of 1880 dtex formed from two 940 dtex nylon 66 yarns, each having a twist of 4.7 turns/cm in the same twist direction, by combining and twisting the two yarns together at 4.7 turns/cm in the opposite twist direction to produce cord with a degree of twist of 4.7 turns/cm.
warp cord diameter: 0.53 mm warp density: 11 cords/cm width of selvedge portion: 10 mm Body Portion warp cord: same as in EXAMPLES I & II
warp cord diameter: 0.625 mm warp denstiy: same as in EXAMPLES I & II
From the above it is apparent that the warp cords in the selvedge portions have a degree of twi~t equal to 4.7 times the degree of twist of the warp cords in the body portion and that the warp cords in the selvedge portions have a diamenter equal to 85% of the diameter of the warp cord~ in the body portion.
A number of pieces of fabric of length sufficient to run from bead to bead of a particular size of tire and to provide for the required "turn ups" were cut off the roll of intermediate material at an angle of 90 to the direction of the warp cords. These pieces of fabric (pieces A) were used to make new pieces (pieces B) each having a length as required for the particular size of tire as described in EXAMPLE II. The width of each splice was 10 mm.
The new pieces B were used for the carcasses of radial tires as follows:
.
12f~31Z
Tire Size: FR 78-14 (radial construction) Carcass Ply: monoply Tests on two of the above tires each containing tire cord fabric of the present invention with a selvedge portion t:o body portion splice revealed that:
(1) the uniformity of the tires was acceptable as indicated by radial load variation measurements.
(2) the splice indentations in the sidewalls of the tires were also acceptable ranging from 0.20 mm to 0.30 mm in depth when the tires were inflated to 275 kPa.
EXAMPLE IV
As a comparison, an intermediate material having two selvedge portions and a body portion was made, rubberized and wound up as a roll. The characteristics of the roll of intermediate material were the same as described in ~SXAMPLE I except that the same tire cord was used as warp cord in selvedge portions as in the body portion. These characteristics were as follows:
Sel~redge Portion wl~rp cord: same as in EXAMPLE I, degree oE twist of four turn~/cm wl~rp density: 11 cords/cm (same as in EXAMPLE I) wLdth oP each selvedge portion: 10 mm (same as in EXAMPLE I) Body Portion warp cord: Same as in selvedge portion (see above), degree of twist of four turns/cm warp density: 11 cords/cm (same as in selvedge portion) From the above it is apparent that the warp cords in the selvedge portions have a degree of twist the same as, i.e. one times the degree of twist of the warp cords in the body portion.
.
.. .
.: , , 1~6~812 A number of pieces of fabric were cut off the roll of intermediate ma-terial a~ describ~d in FIXAMPLE I.
These pieces of fabric were then spliced together as described in EXAMPLE I. The width o~ each splice in the new roll of fabric was 10 mm.
Lengths were cut from the roll of new fabric and used for the carcasses of radial tires as follows:
Tire size: ER78-l4 (radial construction) Carcass Ply: monoply Tests on two of the above tires each containing tire cord ~abric with a selvedge portion to selvedge portion splice, but outside the scope of the present invention revealed that:
(1) non-uniformities in the tires were apparent as indicated by the radial load variation of tires being two times that of the tires produced in EXAMPLES I and III.
(2) the splice indentations in the sidewalls of the tires were unacceptable ranging from 0.61mm to 0.69 mm in depth when the tires were inflated to 275 kPa.
EXAMPLE V
As a further comparison, an intermediate material having two selvedge portions and a body portion was made, rubberizecl and wound up as a roll. The characteristics of the roll of intermediate material were the same as described in EXAMPLE II except that the same tire cord was used as warp cord in the selvedge porti.ons as in the body portion.
These characteristics were as follows:
Selvedge Portion warp cord: same as in EXAMPLES I & II, degree of twist of four turns/cm warp density: 11 cords/cm width of eac!h 35 selvedge porti.on: 12.7 cm ~z6asl2 Body Portion warp cord: same as in selvedge portion warp density: 11 cords/cm From the above it is apparen-t that the warp cords in the selvedge portions have a degree of twist the same as, i.e. one times the degree of twist of the warp cords in the body portion.
A number of pieces of fabric were cut off the roll of intermediate material as described in EXAMPLE II. A
number o~ these pieces of fabric were then spl.iced together.
The width of each splice in the new fabric was 12.7 mm.
Lengths of new fabric were used for the carcasses o radial tires as follows:
Tire size: FR78-14 Carcass Ply: monoply Tests on two of the above tires each containing tire cord fabric with a selvedge portion to body portion splice, but outside the scope of the present invention revealed that:
(1) non-uniformit.ies in the tires were apparent as indicated by indentations visible in the sidewall rated objectionable by persons experienced in radial tire manuEacture.
(2) The splice indentations in the sidewalls of the tires were unacceptable and in excess of S0 units in depth on a scale in which 25 units or :less is rated acceptable; this measurement scale being different from that used in EXAMPLES I., III and IV.
Claims (12)
1. In a tire cord fabric suitable for reinforcement of rubber tires, the fabric comprising a plurality of bodies and at least one splice, each body being composed of two selvedge portions and a remaining central portion and containing therein a large number of warp cords arranged side by side and parallel to the selvedge portions, the warp cords being relatively coarsely interlaced with weft yarns, said splice being formed by overlapping the selvedge portion of one body with the selvedge portion of an adjoining body, the improvement comprising each of the selvedge portions having warp cords with a degree of twist at least three times as high as the degree of twist of the warp cords in the central portions.
2. The tire cord fabric according to Claim 1, wherein the degree of twist in the warp cords in each selvedge portion is in the range of from three to six times the degree of twist in the warp cords in the central portions.
3. The tire cord fabric according to Claim 2, wherein the splice has a width in the range of from 5 mm to 15 mm.
4. The tire cord fabric according to Claim 3 wherein the warp cords in the selvedge portions and in the central portions are made from nylon 66 continuous filament yarns.
5. The tire cord fabric according to Claim 2 wherein the splice has a width of 10 mm.
6. The tire cord fabric according to any one of Claim 1, Claim 3 and Claim 4 wherein the bodies are rubberized bodies.
7. A tire cord fabric suitable for reinforcement of rubber tires, the fabric comprising: a first body, a second body and a splice joining the two bodies, the first body being composed of two selvedge portions and a remaining remaining central portion and the second body being composed of one selvedge portion and a remaining portion having an edge opposite the selvedge portion, the two bodies containing a large number of warp cords arranged side by side and parallel to the selvedge portions, the warp cords being relatively coarsely interlaced with weft yarns, the splice being formed by overlapping one selvedge portion of the first body with the edge opposite the selvedge portion of the second body, each of the selvedge portions having warp cords with a degree of twist at least three times as high as the degree of twist of the warp cords in the remaining portions of the two bodies, the splice having a width in the range of from 5 mm to 15 mm.
8. The tire cord fabric according to Claim 7 wherein the degree of twist in the warp cords in each selvedge portion is in the range of from three to six times the degree of twist in the warp cords in the remaining portions of the two bodies.
9. The tire cord fabric according to Claim 8 wherein the warp cords in the selvedge portions and in the remaining portions are made from nylon 66 continuous filament yarns.
10. The tire cord fabric according to Claim 9 wherein the warp cords in each selvedge portion have a diameter in the range of from 82% to 99% of the diameter of the warp cords in the remaining portions of the two bodies.
11. The tire cord fabric according to Claim 10 wherein the splice has a width of 10 mm.
12. The tire cord fabric according to any one of Claim 7, Claim 9 and Claim 10 wherein the two bodies are rubberized bodies.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848422192A GB8422192D0 (en) | 1984-09-03 | 1984-09-03 | Tire cord fabric |
| GB84.22192 | 1984-09-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1260812A true CA1260812A (en) | 1989-09-26 |
Family
ID=10566173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000489668A Expired CA1260812A (en) | 1984-09-03 | 1985-08-29 | Tire cord fabric with greater twist cords in the selvedge area |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1260812A (en) |
| GB (1) | GB8422192D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1816011A1 (en) * | 2006-02-07 | 2007-08-08 | Continental Aktiengesellschaft | Reinforcement layer for Ultra High Performance pneumatic tyres with radial construction, in particular for producing tyre carcasses, and method to mount the reinforcement layer on a tyre assembly drum |
| EP3090885A1 (en) * | 2015-05-07 | 2016-11-09 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
-
1984
- 1984-09-03 GB GB848422192A patent/GB8422192D0/en active Pending
-
1985
- 1985-08-29 CA CA000489668A patent/CA1260812A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1816011A1 (en) * | 2006-02-07 | 2007-08-08 | Continental Aktiengesellschaft | Reinforcement layer for Ultra High Performance pneumatic tyres with radial construction, in particular for producing tyre carcasses, and method to mount the reinforcement layer on a tyre assembly drum |
| EP3090885A1 (en) * | 2015-05-07 | 2016-11-09 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8422192D0 (en) | 1984-10-10 |
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