CA1143253A - Textile fabric belting - Google Patents
Textile fabric beltingInfo
- Publication number
- CA1143253A CA1143253A CA000351773A CA351773A CA1143253A CA 1143253 A CA1143253 A CA 1143253A CA 000351773 A CA000351773 A CA 000351773A CA 351773 A CA351773 A CA 351773A CA 1143253 A CA1143253 A CA 1143253A
- Authority
- CA
- Canada
- Prior art keywords
- weft
- ply
- yarns
- yarn
- fabric
- 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
- D03D11/00—Double or multi-ply fabrics not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Woven Fabrics (AREA)
- Reinforced Plastic Materials (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT
"IMPROVEMENTS IN OR RELATING TO TEXTILE FABRIC BELTING"
A problem encountered in increasing the tensile strength of conveyor belting is that when the belting is made thicker to increase its strength, it becomes difficult to impregnate the interior of the belting carcass. To overcome this difficulty, the invention provides a method for manufacturing solid woven beltings which comprises weaving a textile fabric carcass having a plurality of integrally woven layers of weft and subsequently impregnating and coating said carcass with a polymeric material, the textile carcass having five or seven integrally woven layers of weft and being woven in such a manner that the warp yarns define a plurality of continuous flow paths along which the impregnant can travel from the outer surfaces of the carcass to the interior core and each of the warp yarns defines such a path. The weft layers may be interlocked solely by dual function warp yarns all of which serve simultaneously to impart tension resistant strength to the fabric.
"IMPROVEMENTS IN OR RELATING TO TEXTILE FABRIC BELTING"
A problem encountered in increasing the tensile strength of conveyor belting is that when the belting is made thicker to increase its strength, it becomes difficult to impregnate the interior of the belting carcass. To overcome this difficulty, the invention provides a method for manufacturing solid woven beltings which comprises weaving a textile fabric carcass having a plurality of integrally woven layers of weft and subsequently impregnating and coating said carcass with a polymeric material, the textile carcass having five or seven integrally woven layers of weft and being woven in such a manner that the warp yarns define a plurality of continuous flow paths along which the impregnant can travel from the outer surfaces of the carcass to the interior core and each of the warp yarns defines such a path. The weft layers may be interlocked solely by dual function warp yarns all of which serve simultaneously to impart tension resistant strength to the fabric.
Description
\
~143Z53 ,...
DESCRI~ ION
nIMPROVEMh~S IN OR PELAq!ING q!O q!E~l!IIE :I?ABRIC ~EIll!ING~
This inYention rel~tes to conveyor belting~
¢omprising a textile fabric carcass impre~nated a~d coated with a polymeric material and more par*icularly to such belting~ wherein the carcas~ consist~ of an ntegrally wo~en structure having a plurality of we~t ~ layers. Such belti~g i8 sometimes referred to as solid ; ~o~en belting.
Impregnation of a textile carcass whether by rubber latex or by a pla~tics material such as poly (~inyl-chloride) (PVC) require~ great care in order to ensure thorough and unifor~ penetration Or the impregnan~ into the core of the fabric, that is without penetration in~o the interior of the core being limited to quite locali~ed areas. In the latter event, the re~ultan~ bel~ing exhibits inferior qualities of ~ensile ~trength and durability. Moreo~er, even with the inclusion of flame r~tardant materials in the polymer ¢ompound, inadequately ~mpregnated carcasses cannot be rondered fire resistant to the hiEh standard reguired ~or use undergrou~d ~n coal mines.
Ic one widely u~ed method o~ belting manufacture, ~mpregnation of loo~e or open weave solid wo~en multiple ply te~tile carcasses with PVC has been ~ound to produce belting Or a 5urprisingly solid and durable struc~ure.
However, these solid woven beltings ha~e, hitherto, been limited to, at most, four layer~ o~ weft. ~ttempts to produce belti~gs hav~g more than four layers of weft ha~e -~ not been successful becauge of the inability to achieve ; 30 satisfacto~ impregnation, particularly at the innermost core of the fabric.
The trend toward~ higher horsepower drive~ on ¢onveyor install~ions has made i~ de~irable to produce - belting~ h~ing ~reater wor~ing 3trengths. This ha~
;
. ..
. ~, .
. .
. . ~ , .
- ~143Z53 _ ~ _ lcd belti~ ma~ufa¢turers to incorporate in¢reasingly 6r~a~er proportions of ~ynthetic filament yarn into their con~tructions to the exclu~ion of natural or staple $ibre which has inherently lower tensile strength.
-~ 5 Unfortunately, adhesion of the impregnant to the rolatively smooth surfaced chemically inacti~e filament ~arn i9 poor in ¢omparison with natural fibro. ~o over¢ome this problem, it i8 known to incorporate natural or 3taple fibre yarn into the carcass either in the weft where tensile stren~th ~8 not 80 important or in the warp in the ~orm of a pile or as binder threads. The - difficulty can then arise that, if the staple fibre yarn or cotton or other natural fibre ya ns are inco~porated into the weav~ to improve the impregnant adhesion, the tighter nature of the resultins wea~e and to some extent pre¢i~ely the fibrous n~ture of the binders which gi~es the improved adhesion also tend to block the flow paths available to the impregnant in the wea~e with the re~ult - that the penetration of the impregnant into the weave is 20 ser~ously inhibited. - -An ob~ect of the present in~ention is to ~rovide a method for manufacturing a relati~ely thick, high strength, solid woven conveyor belting which can be rendered fire re~istant, for example to the-standard requirsd for use underground in coal mines in the Unîted Eingdom.
~ ccording to one aspect of the pre~ent invention, a method ~or manufacturing solid woven beltings comprises wea~ing a textile carcass having fi~e or more integrally wo~en layers of weft and subsequently impregnating and coating said carcass with a polymaric material, (such as PVC), said carcass being woven in such a manner that the warp ~ah-n~ define a pluralit~ of conti~uous flow paths along which the impregna~t can tra~el from the outer surraces of the carcass to the interior core and each of the ~arp ~arns defines such a path. ~hu~ in the case of - a ~ve ply carcass, the flow paths may ~e proYided b~
. , , .,' . , ~ , .
' : ' :
.
, . .
warp yarn~, each Or which passes ~rom an outermost ply to the central ply.
Viewed from another aspect, the present invention p~ovides a method for m~nufacturin~ solid woven beltings wherein a textile fabric carcass consisting of five or ; more layers of we~t is woven to ~orm an integrated ~tructure, said weft layers boi~g interlocked ~olely by dual function warp yarns all of which serve simultaneously ; / to impart tension resistant streneth to the fabric, Qaid carcass being subsequent~-J impregnated and coated with a ~- pol~meric material, such as PVC.
n the method according to the in~ention, therefore, each of the warp yarn~ ser~es the dual function of ~mparting tension resistant strength to the carcass whilst simultaneously constituting means whereby five separate weft layers are interlocked.
The invention includes solid woven beltings when-o~er produced by the methods o~ the invsntion. ~he ~nvention also includes a textile car¢ass woven as above for use in the methods of the invention.
I~ one construction ~or use in the invent~on, the ~abric has ~ive plies, that is to say at each weft position there are five weft yarns traversing the fabric in superposed relationship and, in order to provide a ready rlow path for the impregnating material, each warp yarn pa~ses (1) over (or under) a weft yarn in an outer-most ply, ~2) between two ad~acent weft yarns in an intermedi~te ply and then (~) under (or over, respectively) ;` a weft yarn in the centre ply, the said weft yarns in the intermediate ply being in columns of weft yarns l~ing between col~mns containing respectively the said weft yarn in the outermost ply and the said weft yarn iG the ; centre ply. Preferably the columns containing the said weft yarns in the outermost a~d centre plies are immediately ~5 ad~acent to the sa~d weft yarns in the intermediate ply.
_ 4 _ In au alternat~e construction for U89 in the invention, the fabric ha~ seven plies, that is to sa~ at each weft position there are seven weft yarns traver~ing the fabric in superposed relationship. In one embodiment oP the Qe~en ply construction, each warp yarn passes (l) over (or u~der) a weft yarn in an outermost ply, (2) between two ad~acent weft yar~s in each Or two inter-mediate plies and then (3) under (or over respecti~ely) a weft yarn ~ the centre ply, the weft yarns in the 10 intermediate plies lying between columns containi~ -respectively the weft yarn in the outermost ply and the ` weft ~arn in the centre ply. Preferably the columns coutaining respecti~ely ths weft yar~ in the outermost and centre plies are immediatel~ adjacent to the weft yarns in the intermediate plies.
Although the invention may readily be used for the production of fabric from natural yarns such as cotton, it i~ particularly advantageous when used in the weaving Or fabrics which incorporate a sub~tantial proportion of 20 synthetic filament yarns such as polyesters or polyamides ; or which consist wholly of such ~ynthetic yarns.
;; By virtue of the construction provided by the ~nvention, the fabric has an interstitial structure and a pla~tics flow path which present proper interstices for 25 maximum take-up of impregnating material and adhesion ~Tith the fabric together with substantially uniform penetration of the impregnating material throughout the whole cross--section of the fabric. Where the fabric i8 a textile core ~or conYeyor or power transmission belti~g, the ~nve~tion 30 thus provide~ a core in which all the plies are interlocXed as woven and bcfore impregnation with a pol~mer, for example P.Y.C. is effected. A significa~t ad~antag0 o this con~truction lies in the excellent adhesion between the interconnected plies a~d between the fabric ccre and 3~ ~h~ e~veloping surface coating of the impregnating material, in the latter case due to the surface pockets prssented ... .
, , :
by the fabric. ~h~se features in turn impart a significant ~mprovement to the ability of belt rasteners to engago the ~inished belting and, since all the warp yarns are load bearing yarns rather than simply binders, to the tonsion whi¢h may be appl$ed to the belting before the ~asteners yield or fail. It is preferrod, although not e8sontial, that tho nature and arrangement of the warp ` yarns is such that the load experienced by them when the ` rabriC i8 sub~ected to tension is shared egually and uni~ormly between the~. This is most conveniently achieved by employing warp yarns which are identi¢al to one another and equally spaced across the width o~ the ~abri¢.
The invention will be described further? by way of ~ ` 15 example, with referen¢e to the a¢¢ompanying drawings in -~ whl¢h:-Fig.l i8 a longitudinal ¢ross-~e¢tion of a portion Or a textile fabri¢ for use in the invention;
; Fig.2 is a fragmentary perspe¢tiYe view o~ a portion of a power transmission or a ¢on~eyor belt; and Fig.3 is a longitudinal cross-section of a portion o~ another textile ~abric for use in the invention.
The fabric illustrated in Fig.l of the drawings is five ply fabric and accordingly at ea¢h weft position there are rive wert yarns 10,12,14,16,18 traversing the fabric and arranged in superpo6ed relation~hip in columns.
The series of weft yarns 10 and 18 define outermo~t plies, the series of weft yarns 12 and 16 define intermediate plies and series of weft yarns 14 defines a centre ply.
These five plies are interlocked solely by the warp yarns whi¢h are desiEnated 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42. ~o achieve the required interlocking, the warp yarn~ are arranged to lock the outermost plies to th~ ce~tre ply and pass through the intermediate plies;
this is acco~plished by taking each warp yarn, for example the warp ~arn 20 over a weft yarn 10 in the top ply, between . .
. ' ; , ,: ' .~.... . .
--' ~
~dJacen~ weft yar~s 12 in an intermediate ply and then under the next but two weft yarn 14 (viewed i~ the warp direction) of the centre ply, and so one along the lcngth of the fabric. Similarly, the warp yarn 42 i8 taken under a weft yarn lA in the bottom ply, between ad~acent weft yarn~ 16 in an intermediate ply and over the nex~ but two wert yarn 14 in the ¢entre ply, and so on.
It will be seen that this fi~e ply construction is ; 10 achieved b~ the use of twel~e warp yarns and that the ~abric may readily be woven on a conventional twelve ; sha~t loom (giving 30 picks per r~peat of the weave).
~he binder warp yarns all follow identical path~ for a ;~ full tensile contribution. Each warp yarn binds together - 15 three plies, repeati~g o~er six pic~s in each ply.
- ~he arrangement of the binder warp yarns is 3y~metrical about the centre ply and ¢onsists Or oppositely disposed pairs of warp yarns, each pair containing 1,3,~ picks on th~ outermost, intermediate and centre plies respectively.
The ¢onfiguration of warp yarns employed by the in~ention will be seen to provide a relati~ely open wea~e in the resulting fabric and although the five plies in the fabric are securel~ locked together, the warp yarns neverthele~s will be seen to create well-defined flow paths leading to the centre of the fabric 80 that when the fabric is presented for impregnation by a plastics ¢ompound such as a polyvinyl compound, the l~tter readily penetrate3 completel~ throu~h to th~ centre o~ the core and, due to the open nature of the wea~e, is also able ~0 to ~urround a~d enclose completely each weft and warp yar~. ~hi~ is important from the standpoint of fire resi~t~ce 3ince the plastics compound normally incorpor-ates fire retardant~.
It will ~e noted that since all tk~ wa~p yarns ~5 co~tribute to the load bsaring strsngth of the eventual fab~ic (tha~ is to ~ay no corl~entional binders or stuffer~
~ .
'; ~ , . . :
... . ..
,.,~ . ' ' .
: . ~ , .
. : , .
. , . -`` 1~43ZS3 are used in the weave) the fabric i8 economic to produce.
In the particular example illustr~ted it will also be observed that, because there is an odd number of plies in the fabric, the weave is symmetrical about the centre ply and this produces a substantially uniform cross-~ectional strength in the impregnated fabric.
Other ~onstruction~ of weave may be used within the 8cope of the invention. ~he precise weave cho3en in any particular case is determined by such factors as ~he operational performance expected of the fabric, t~e nature of the plastics impregnant and the degree o~
plastics take-up required.
The fabric which is illustrated by ~ay of example in Fig.l i~ a five ply fabric and one such fabric which i8 suitable as the carcas~ for belting is o~ the five ply ; construction sho-~n, with the following additional characteristic~:
Warp 12 ends per repeat of weave (12 ~hafts) 8 fold 1260d nylon (1400 Deoitex) or 10 fold lOOOd polyester (1100 Decite~) 8 repeatq of weave per inch in the rinished belt Weft 4 ends Or 840d nylon (933 Decitex) folded with 3 ends of 4'8 cotton at 24 picks per inch (Decitex i~ the count of weight per unit length of the yarn) 30 ake-u~ ~ctual, 220% by weight on impregnation with PVC (ratio 1:2.2) at 29 inches - of mercury impregnation pressure For b~lting applications, the belt~ng carcasses may comprise five plies as illustrated in ~ig.l, but in general, carcasseq compri9ing an odd number of plis~ of at least five may be used. The practical limitation is t~e carcass itself because the thicknes~ ~nd ~tiffness of a carc~s naving aII exc~ssive number of plies is.~ucn . ; , ` ~143253 a~ to make it almost impos~ible to flex round pulle~s.
With a fi~e ply construction it i3 possible to achieve a belting ~trength a~ high as 1~,000 to 20,000 lbs/inch w~dth which is capable Or coping with all but the very exceptional high horsepower drives which are encountered.
However, for even higher belting strengths, the seven ply constxuction illustrated in Fig.3 and described below may be used.
For completeness, ~6.2 shows a portion of belting suitable for conveyor belting or rOr power transmission belting and indicates, entirely diagrammatically, the plastic outer sheathing 50 which remains after the textile ¢arcass generally designated 52 has been impregnated.
Where the impregnant is a material such as pol~vinyl-chloride, impregnation is readily effected by passingthe carcas~ 52 through a liquid suspension or dispersio~
o~ ungelled polyvinyl chloride together with a plastici~er a~d thereafter ~ub~ecting the impregnated fabric to a heat treatment in order to gel the polyvinyl chlor~de.
As previously mentioned, the open nature of the -~ea~e resulting rrom the in~ention facilitate~ the flow of the impregnant into the core and acts strongly against the rormation of cavities at the belt centre.
The fabric illu~trated in Pig.~ of the drawings ~8 a seven ply fabric and accordingly at each weft position there are seven weft yarn~, 60, 62, 64, 66, 68, 70, 72 traversing the fabric and arranged in superpo~ed relation-ship in columns. ~hese seven plies are interlocked solely b~ the warp yarn~ which are designated 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 10~, 106, 108, 110.
The principle of construction for the seven ply fabric of ~ig.~ is the same a~ for the ~i~e pl~ fabric of Fig.l.
Thus, to achie~e the raquired interlocki~g i~ Fig.~, the ; warp yarn~ are arranged to lock the oute~most plies to 35 the cer.tre ply ard pass through the inter~ediats plies.
., ' , ' ~
.
..
~143Z53 ,...
DESCRI~ ION
nIMPROVEMh~S IN OR PELAq!ING q!O q!E~l!IIE :I?ABRIC ~EIll!ING~
This inYention rel~tes to conveyor belting~
¢omprising a textile fabric carcass impre~nated a~d coated with a polymeric material and more par*icularly to such belting~ wherein the carcas~ consist~ of an ntegrally wo~en structure having a plurality of we~t ~ layers. Such belti~g i8 sometimes referred to as solid ; ~o~en belting.
Impregnation of a textile carcass whether by rubber latex or by a pla~tics material such as poly (~inyl-chloride) (PVC) require~ great care in order to ensure thorough and unifor~ penetration Or the impregnan~ into the core of the fabric, that is without penetration in~o the interior of the core being limited to quite locali~ed areas. In the latter event, the re~ultan~ bel~ing exhibits inferior qualities of ~ensile ~trength and durability. Moreo~er, even with the inclusion of flame r~tardant materials in the polymer ¢ompound, inadequately ~mpregnated carcasses cannot be rondered fire resistant to the hiEh standard reguired ~or use undergrou~d ~n coal mines.
Ic one widely u~ed method o~ belting manufacture, ~mpregnation of loo~e or open weave solid wo~en multiple ply te~tile carcasses with PVC has been ~ound to produce belting Or a 5urprisingly solid and durable struc~ure.
However, these solid woven beltings ha~e, hitherto, been limited to, at most, four layer~ o~ weft. ~ttempts to produce belti~gs hav~g more than four layers of weft ha~e -~ not been successful becauge of the inability to achieve ; 30 satisfacto~ impregnation, particularly at the innermost core of the fabric.
The trend toward~ higher horsepower drive~ on ¢onveyor install~ions has made i~ de~irable to produce - belting~ h~ing ~reater wor~ing 3trengths. This ha~
;
. ..
. ~, .
. .
. . ~ , .
- ~143Z53 _ ~ _ lcd belti~ ma~ufa¢turers to incorporate in¢reasingly 6r~a~er proportions of ~ynthetic filament yarn into their con~tructions to the exclu~ion of natural or staple $ibre which has inherently lower tensile strength.
-~ 5 Unfortunately, adhesion of the impregnant to the rolatively smooth surfaced chemically inacti~e filament ~arn i9 poor in ¢omparison with natural fibro. ~o over¢ome this problem, it i8 known to incorporate natural or 3taple fibre yarn into the carcass either in the weft where tensile stren~th ~8 not 80 important or in the warp in the ~orm of a pile or as binder threads. The - difficulty can then arise that, if the staple fibre yarn or cotton or other natural fibre ya ns are inco~porated into the weav~ to improve the impregnant adhesion, the tighter nature of the resultins wea~e and to some extent pre¢i~ely the fibrous n~ture of the binders which gi~es the improved adhesion also tend to block the flow paths available to the impregnant in the wea~e with the re~ult - that the penetration of the impregnant into the weave is 20 ser~ously inhibited. - -An ob~ect of the present in~ention is to ~rovide a method for manufacturing a relati~ely thick, high strength, solid woven conveyor belting which can be rendered fire re~istant, for example to the-standard requirsd for use underground in coal mines in the Unîted Eingdom.
~ ccording to one aspect of the pre~ent invention, a method ~or manufacturing solid woven beltings comprises wea~ing a textile carcass having fi~e or more integrally wo~en layers of weft and subsequently impregnating and coating said carcass with a polymaric material, (such as PVC), said carcass being woven in such a manner that the warp ~ah-n~ define a pluralit~ of conti~uous flow paths along which the impregna~t can tra~el from the outer surraces of the carcass to the interior core and each of the ~arp ~arns defines such a path. ~hu~ in the case of - a ~ve ply carcass, the flow paths may ~e proYided b~
. , , .,' . , ~ , .
' : ' :
.
, . .
warp yarn~, each Or which passes ~rom an outermost ply to the central ply.
Viewed from another aspect, the present invention p~ovides a method for m~nufacturin~ solid woven beltings wherein a textile fabric carcass consisting of five or ; more layers of we~t is woven to ~orm an integrated ~tructure, said weft layers boi~g interlocked ~olely by dual function warp yarns all of which serve simultaneously ; / to impart tension resistant streneth to the fabric, Qaid carcass being subsequent~-J impregnated and coated with a ~- pol~meric material, such as PVC.
n the method according to the in~ention, therefore, each of the warp yarn~ ser~es the dual function of ~mparting tension resistant strength to the carcass whilst simultaneously constituting means whereby five separate weft layers are interlocked.
The invention includes solid woven beltings when-o~er produced by the methods o~ the invsntion. ~he ~nvention also includes a textile car¢ass woven as above for use in the methods of the invention.
I~ one construction ~or use in the invent~on, the ~abric has ~ive plies, that is to say at each weft position there are five weft yarns traversing the fabric in superposed relationship and, in order to provide a ready rlow path for the impregnating material, each warp yarn pa~ses (1) over (or under) a weft yarn in an outer-most ply, ~2) between two ad~acent weft yarns in an intermedi~te ply and then (~) under (or over, respectively) ;` a weft yarn in the centre ply, the said weft yarns in the intermediate ply being in columns of weft yarns l~ing between col~mns containing respectively the said weft yarn in the outermost ply and the said weft yarn iG the ; centre ply. Preferably the columns containing the said weft yarns in the outermost a~d centre plies are immediately ~5 ad~acent to the sa~d weft yarns in the intermediate ply.
_ 4 _ In au alternat~e construction for U89 in the invention, the fabric ha~ seven plies, that is to sa~ at each weft position there are seven weft yarns traver~ing the fabric in superposed relationship. In one embodiment oP the Qe~en ply construction, each warp yarn passes (l) over (or u~der) a weft yarn in an outermost ply, (2) between two ad~acent weft yar~s in each Or two inter-mediate plies and then (3) under (or over respecti~ely) a weft yarn ~ the centre ply, the weft yarns in the 10 intermediate plies lying between columns containi~ -respectively the weft yarn in the outermost ply and the ` weft ~arn in the centre ply. Preferably the columns coutaining respecti~ely ths weft yar~ in the outermost and centre plies are immediatel~ adjacent to the weft yarns in the intermediate plies.
Although the invention may readily be used for the production of fabric from natural yarns such as cotton, it i~ particularly advantageous when used in the weaving Or fabrics which incorporate a sub~tantial proportion of 20 synthetic filament yarns such as polyesters or polyamides ; or which consist wholly of such ~ynthetic yarns.
;; By virtue of the construction provided by the ~nvention, the fabric has an interstitial structure and a pla~tics flow path which present proper interstices for 25 maximum take-up of impregnating material and adhesion ~Tith the fabric together with substantially uniform penetration of the impregnating material throughout the whole cross--section of the fabric. Where the fabric i8 a textile core ~or conYeyor or power transmission belti~g, the ~nve~tion 30 thus provide~ a core in which all the plies are interlocXed as woven and bcfore impregnation with a pol~mer, for example P.Y.C. is effected. A significa~t ad~antag0 o this con~truction lies in the excellent adhesion between the interconnected plies a~d between the fabric ccre and 3~ ~h~ e~veloping surface coating of the impregnating material, in the latter case due to the surface pockets prssented ... .
, , :
by the fabric. ~h~se features in turn impart a significant ~mprovement to the ability of belt rasteners to engago the ~inished belting and, since all the warp yarns are load bearing yarns rather than simply binders, to the tonsion whi¢h may be appl$ed to the belting before the ~asteners yield or fail. It is preferrod, although not e8sontial, that tho nature and arrangement of the warp ` yarns is such that the load experienced by them when the ` rabriC i8 sub~ected to tension is shared egually and uni~ormly between the~. This is most conveniently achieved by employing warp yarns which are identi¢al to one another and equally spaced across the width o~ the ~abri¢.
The invention will be described further? by way of ~ ` 15 example, with referen¢e to the a¢¢ompanying drawings in -~ whl¢h:-Fig.l i8 a longitudinal ¢ross-~e¢tion of a portion Or a textile fabri¢ for use in the invention;
; Fig.2 is a fragmentary perspe¢tiYe view o~ a portion of a power transmission or a ¢on~eyor belt; and Fig.3 is a longitudinal cross-section of a portion o~ another textile ~abric for use in the invention.
The fabric illustrated in Fig.l of the drawings is five ply fabric and accordingly at ea¢h weft position there are rive wert yarns 10,12,14,16,18 traversing the fabric and arranged in superpo6ed relation~hip in columns.
The series of weft yarns 10 and 18 define outermo~t plies, the series of weft yarns 12 and 16 define intermediate plies and series of weft yarns 14 defines a centre ply.
These five plies are interlocked solely by the warp yarns whi¢h are desiEnated 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42. ~o achieve the required interlocking, the warp yarn~ are arranged to lock the outermost plies to th~ ce~tre ply and pass through the intermediate plies;
this is acco~plished by taking each warp yarn, for example the warp ~arn 20 over a weft yarn 10 in the top ply, between . .
. ' ; , ,: ' .~.... . .
--' ~
~dJacen~ weft yar~s 12 in an intermediate ply and then under the next but two weft yarn 14 (viewed i~ the warp direction) of the centre ply, and so one along the lcngth of the fabric. Similarly, the warp yarn 42 i8 taken under a weft yarn lA in the bottom ply, between ad~acent weft yarn~ 16 in an intermediate ply and over the nex~ but two wert yarn 14 in the ¢entre ply, and so on.
It will be seen that this fi~e ply construction is ; 10 achieved b~ the use of twel~e warp yarns and that the ~abric may readily be woven on a conventional twelve ; sha~t loom (giving 30 picks per r~peat of the weave).
~he binder warp yarns all follow identical path~ for a ;~ full tensile contribution. Each warp yarn binds together - 15 three plies, repeati~g o~er six pic~s in each ply.
- ~he arrangement of the binder warp yarns is 3y~metrical about the centre ply and ¢onsists Or oppositely disposed pairs of warp yarns, each pair containing 1,3,~ picks on th~ outermost, intermediate and centre plies respectively.
The ¢onfiguration of warp yarns employed by the in~ention will be seen to provide a relati~ely open wea~e in the resulting fabric and although the five plies in the fabric are securel~ locked together, the warp yarns neverthele~s will be seen to create well-defined flow paths leading to the centre of the fabric 80 that when the fabric is presented for impregnation by a plastics ¢ompound such as a polyvinyl compound, the l~tter readily penetrate3 completel~ throu~h to th~ centre o~ the core and, due to the open nature of the wea~e, is also able ~0 to ~urround a~d enclose completely each weft and warp yar~. ~hi~ is important from the standpoint of fire resi~t~ce 3ince the plastics compound normally incorpor-ates fire retardant~.
It will ~e noted that since all tk~ wa~p yarns ~5 co~tribute to the load bsaring strsngth of the eventual fab~ic (tha~ is to ~ay no corl~entional binders or stuffer~
~ .
'; ~ , . . :
... . ..
,.,~ . ' ' .
: . ~ , .
. : , .
. , . -`` 1~43ZS3 are used in the weave) the fabric i8 economic to produce.
In the particular example illustr~ted it will also be observed that, because there is an odd number of plies in the fabric, the weave is symmetrical about the centre ply and this produces a substantially uniform cross-~ectional strength in the impregnated fabric.
Other ~onstruction~ of weave may be used within the 8cope of the invention. ~he precise weave cho3en in any particular case is determined by such factors as ~he operational performance expected of the fabric, t~e nature of the plastics impregnant and the degree o~
plastics take-up required.
The fabric which is illustrated by ~ay of example in Fig.l i~ a five ply fabric and one such fabric which i8 suitable as the carcas~ for belting is o~ the five ply ; construction sho-~n, with the following additional characteristic~:
Warp 12 ends per repeat of weave (12 ~hafts) 8 fold 1260d nylon (1400 Deoitex) or 10 fold lOOOd polyester (1100 Decite~) 8 repeatq of weave per inch in the rinished belt Weft 4 ends Or 840d nylon (933 Decitex) folded with 3 ends of 4'8 cotton at 24 picks per inch (Decitex i~ the count of weight per unit length of the yarn) 30 ake-u~ ~ctual, 220% by weight on impregnation with PVC (ratio 1:2.2) at 29 inches - of mercury impregnation pressure For b~lting applications, the belt~ng carcasses may comprise five plies as illustrated in ~ig.l, but in general, carcasseq compri9ing an odd number of plis~ of at least five may be used. The practical limitation is t~e carcass itself because the thicknes~ ~nd ~tiffness of a carc~s naving aII exc~ssive number of plies is.~ucn . ; , ` ~143253 a~ to make it almost impos~ible to flex round pulle~s.
With a fi~e ply construction it i3 possible to achieve a belting ~trength a~ high as 1~,000 to 20,000 lbs/inch w~dth which is capable Or coping with all but the very exceptional high horsepower drives which are encountered.
However, for even higher belting strengths, the seven ply constxuction illustrated in Fig.3 and described below may be used.
For completeness, ~6.2 shows a portion of belting suitable for conveyor belting or rOr power transmission belting and indicates, entirely diagrammatically, the plastic outer sheathing 50 which remains after the textile ¢arcass generally designated 52 has been impregnated.
Where the impregnant is a material such as pol~vinyl-chloride, impregnation is readily effected by passingthe carcas~ 52 through a liquid suspension or dispersio~
o~ ungelled polyvinyl chloride together with a plastici~er a~d thereafter ~ub~ecting the impregnated fabric to a heat treatment in order to gel the polyvinyl chlor~de.
As previously mentioned, the open nature of the -~ea~e resulting rrom the in~ention facilitate~ the flow of the impregnant into the core and acts strongly against the rormation of cavities at the belt centre.
The fabric illu~trated in Pig.~ of the drawings ~8 a seven ply fabric and accordingly at each weft position there are seven weft yarn~, 60, 62, 64, 66, 68, 70, 72 traversing the fabric and arranged in superpo~ed relation-ship in columns. ~hese seven plies are interlocked solely b~ the warp yarn~ which are designated 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 10~, 106, 108, 110.
The principle of construction for the seven ply fabric of ~ig.~ is the same a~ for the ~i~e pl~ fabric of Fig.l.
Thus, to achie~e the raquired interlocki~g i~ Fig.~, the ; warp yarn~ are arranged to lock the oute~most plies to 35 the cer.tre ply ard pass through the inter~ediats plies.
., ' , ' ~
.
..
Claims (11)
1. In a method for manufacturing solid woven beltings which comprises weaving a textile fabric carcass having a plurality of integrally woven layers of weft and subsequently impregnating and coating said carcass with a polymeric material, the improvement which comprises weaving a textile fabric carcass having at least five integrally woven layers of weft comprising upper and lower outermost plies, intermediate plies and a center ply, the carcass being woven in such a manner that each warp yarn passes around a weft yarn in one of said outermost plies, between two adjacent weft yarns in one of said intermediate plies disposed between said one of said outermost plies and the center ply and around a weft yarn in said center ply whereby all the warp yarns define a plurality of continuous flow paths along which the impregnant can travel from the outer surfaces of the carcass to the interior core and each of said warp yarns defines such a path and whereby the weft layers are interlocked solely by dual function warp yarns, all of which serve simul-taneously to impart tension resistant strength to the fabric.
2. A method as claimed in claim 1 wherein at each weft position there are five weft yarns traversing the fabric in superposed relationship and wherein the warp yarns consist of two sets of warp yarns connecting the weft yarns, each warp yarn of the first set passing (1) over a weft yarn in the upper outermost ply, (2) between two adjacent weft yarns in an intermediate ply disposed between the upper outermost ply and the center ply and then (3) under a weft yarn in the center ply and each warp yarn of the second set passing (1) under a weft yarn in the lower outermost ply, (2) between two adjacent weft yarns in an intermediate ply disposed between the lower outermost ply and the center ply and then (3) over a weft yarn in the center ply, and in respect of each set of warp yarns, the weft yarns in the intermediate ply being in columns of weft yarns lying between columns containing respectively the weft yarn in the outermost ply and the weft yarn in the center ply.
3. A method as claimed in claim 2, wherein the columns containing the weft yarns in the outermost and centre plies are immediately adjacent to the weft yarns in the intermediate ply.
4. A method as claimed in claim 1, wherein the fabric has seven plies, that is to say at each weft position there are seven weft yarns traversing the fabric in superposed relationship.
5. A method as claimed in claim 4, wherein the fabric is so woven that each warp yarn passes (1) over (or under) a weft yarn in an outermost ply, (2) between two adjacent weft yarns in each of two intermediate plies and then (3) under (or over respectively) a weft yarn in the centre ply, the weft yarns in the intermediate plies lying between columns containing respectively the weft yarn in the outermost ply and the weft yarn in the centre ply.
6. A method as claimed in claim 5, wherein the columns containing the weft yarns in the outermost and centre plies are immediately adjacent to the weft yarns in the intermediate plies.
7. A method as claimed in claim 1, wherein the warp yarns are identical to one another and equally spaced across the width of the fabric.
8. A method as claimed in claim 1, wherein the fabric incorporates a substantial proportion of synthetic filament yarns.
9. A method as claimed in claim 1, wherein the polymeric material is polyvinyl chloride.
10. A solid woven belting comprising a textile fabric carcass having a plurality of integrally woven layers of weft, said belting being impregnated and coated with a polymeric material, said belting having five plies of weft, wherein each warp yarn passes around and inward from a weft yarn in an outermost ply, between two adjacent yarns in an intermediate ply, and around and outward from a weft yarn in the center ply, the weft yarns in the intermediate ply being in columns of weft yarns lying between columns containing respectively the weft yarn in the outermost ply and the weft yarn in the center ply.
11. A solid woven belting comprising a textile fabric carcass having a plurality of integrally woven layers of weft, said belting being impregnated and coated with a polymeric material, wherein at each weft position there are seven weft yarns traversing the fabric in superposed relationship, said fabric being woven so that each warp yarn passes around and inward from a weft yarn in an outermost ply, between two adjacent weft yarns in each of two intermediate plies, and around and outward from a weft yarn in the center ply, the weft yarns in the intermediate plies lying between columns containing respectively the weft yarn in the outermost ply and the weft yarn in the center ply.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7916288 | 1979-05-10 | ||
| GB7916288 | 1979-05-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1143253A true CA1143253A (en) | 1983-03-22 |
Family
ID=10505073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000351773A Expired CA1143253A (en) | 1979-05-10 | 1980-05-09 | Textile fabric belting |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0020038A1 (en) |
| JP (1) | JPS55156039A (en) |
| AU (1) | AU533640B2 (en) |
| CA (1) | CA1143253A (en) |
| ES (1) | ES491325A0 (en) |
| IN (1) | IN152110B (en) |
| ZA (1) | ZA802683B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2233919C2 (en) * | 2002-07-17 | 2004-08-10 | ОАО "Научно-исследовательский институт технических тканей" | Meshed fabric for polymer covering |
| RU2233918C2 (en) * | 2002-07-17 | 2004-08-10 | ОАО "Научно-исследовательский институт технических тканей" | Woven carcass of conveyor belt |
| CN116836419A (en) * | 2023-08-10 | 2023-10-03 | 枣庄天宏新材料科技有限公司 | A high-strength flame-retardant conveyor belt and its preparation method and application |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB770524A (en) * | 1954-01-20 | 1957-03-20 | Fenner Co Ltd J H | Improvements in or relating to the production of power transmission and conveyor belting |
| FR2421969A1 (en) * | 1977-01-13 | 1979-11-02 | Tissus Indls Ste Rhodanienne | Porous fabric construction - has groups of warps and weft strands to give an integral separating layer between woven layers |
-
1980
- 1980-05-05 ZA ZA00802683A patent/ZA802683B/en unknown
- 1980-05-08 EP EP80301500A patent/EP0020038A1/en not_active Withdrawn
- 1980-05-08 AU AU58216/80A patent/AU533640B2/en not_active Ceased
- 1980-05-09 CA CA000351773A patent/CA1143253A/en not_active Expired
- 1980-05-09 ES ES491325A patent/ES491325A0/en active Granted
- 1980-05-09 IN IN550/CAL/80A patent/IN152110B/en unknown
- 1980-05-09 JP JP6160880A patent/JPS55156039A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0020038A1 (en) | 1980-12-10 |
| JPS55156039A (en) | 1980-12-04 |
| ES8104054A1 (en) | 1981-04-16 |
| IN152110B (en) | 1983-10-22 |
| ES491325A0 (en) | 1981-04-16 |
| AU533640B2 (en) | 1983-12-01 |
| ZA802683B (en) | 1981-05-27 |
| AU5821680A (en) | 1980-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3296062A (en) | Belt fabric | |
| US6427728B1 (en) | Conveyor belting with reinforcing fabric formed from three interlaced layers | |
| US5164241A (en) | Transport belt | |
| KR102568578B1 (en) | band sheathed friction transmission belt | |
| RU2742264C1 (en) | Diagonal material for teeth coating and toothed drive belt | |
| US3205119A (en) | Reinforcements for objects made from rubber or plastic material | |
| MX2007014639A (en) | Reinforced belt for powerturn applications . | |
| US5275858A (en) | Woven conveyor belt splice fabric and conveyor belt splice formed therewith | |
| CA1143253A (en) | Textile fabric belting | |
| AU719133B2 (en) | Expandable pintle wires | |
| KR20220016190A (en) | Power transmission belt with striped surface and striped cover fabric | |
| US4131030A (en) | Covering for power transmission belt | |
| EP3680374B1 (en) | A belt comprising a fabric with bilateral satin weave | |
| CA2354020C (en) | Conveyor belting with reinforcing fabric formed from three interlaced layers | |
| US6328077B1 (en) | Interwoven belt fabric | |
| US3002536A (en) | Mechanical belting | |
| CA2161234A1 (en) | Rubberline belting | |
| EP1117947B1 (en) | Synchronous drive belt with scaffold stretch fabric | |
| RU2026903C1 (en) | Reinforced fabric | |
| KR102487838B1 (en) | Belts containing fabrics for application of fabric and shear stress | |
| RU2008381C1 (en) | Woven reinforcing carcass under polymeric coating | |
| CA1152776A (en) | Power transmission belt | |
| GB2357091A (en) | Yarn reinforced product | |
| CA1112909A (en) | Endless power transmission belt, method of making same, and drive system using same | |
| GB1589467A (en) | Reinfrorced conveyor belting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |