CA1100724A - Apparatus and methods for applying tread material to tyres - Google Patents
Apparatus and methods for applying tread material to tyresInfo
- Publication number
- CA1100724A CA1100724A CA282,920A CA282920A CA1100724A CA 1100724 A CA1100724 A CA 1100724A CA 282920 A CA282920 A CA 282920A CA 1100724 A CA1100724 A CA 1100724A
- Authority
- CA
- Canada
- Prior art keywords
- tire
- tire carcass
- tread material
- die means
- central outlet
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
- B29D30/58—Applying bands of rubber treads, i.e. applying camel backs
- B29D30/62—Applying bands of rubber treads, i.e. applying camel backs by extrusion or injection of the tread on carcass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/35—Extrusion nozzles or dies with rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/131—Curved articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Tyre Moulding (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
C A N A D A
"APPARATUS FOR APPLYING UNDERTREAD
TO HEAVY DUTY LUGGED TREAD TIRES"
ABSTRACT OF THE DISCLOSURE
.
Uncured undertread material is extruded onto peripheral surfaces of a heavy duty tire carcass in preparation for application of lugs thereto through the use of apparatus including an extruder, a tire stand for rotatably supporting a tire carcass in spaced relation from the extruder, and a die mounted on the extruder for engagement with peripheral surfaces of a tire carcass supported by the tire stand. The die directs expelled undertread material from the extruder directly onto peripheral surfaces of a rotating tire carcass and co-operates with an engaged tire carcass in defining bank areas for temporarily accumulating expelled undertread material and for maintaining during formation of the undertread layer a bank of undertread material from which carcass non-uniformities are filled.
"APPARATUS FOR APPLYING UNDERTREAD
TO HEAVY DUTY LUGGED TREAD TIRES"
ABSTRACT OF THE DISCLOSURE
.
Uncured undertread material is extruded onto peripheral surfaces of a heavy duty tire carcass in preparation for application of lugs thereto through the use of apparatus including an extruder, a tire stand for rotatably supporting a tire carcass in spaced relation from the extruder, and a die mounted on the extruder for engagement with peripheral surfaces of a tire carcass supported by the tire stand. The die directs expelled undertread material from the extruder directly onto peripheral surfaces of a rotating tire carcass and co-operates with an engaged tire carcass in defining bank areas for temporarily accumulating expelled undertread material and for maintaining during formation of the undertread layer a bank of undertread material from which carcass non-uniformities are filled.
Description
J~007Z4 This invention relates to apparatus and methods for applying tread material to tires.
The invention provides appara-tus for extruding uncured tread material onto a peripheral surface of a tire carcass comprising:
extruder means for expelling tread material under pressure, tire stand means for supporting a tire carcass in spaced relation to said extruder means for rotation of the tire carcass in one direction during extrusion, die means mounted on said extruder means for direc~ing expelled tread material di-rectly onto a peripheral surface of a tire carcass supported by said tire stand means, and rotating in said one direction to form a layer encircling the tire carcass and simultaneously to bond the layer to the carcass, the die means having a central outlet for directing tread material onto a crown portion of the peripheral surface of the tire and two wing elements located one on either side of the central outlet and facing towards each other to direct tread material onto side-wall portions of the peripheral surface of the tire carcass to either side of the crown portion, and modulator means located in the die means for controlling the distribution of flow of tread material through the die means to tend to divert the tread material towards the wing elements of the die means, the central outlet and wing elements of the die means each having leading and trailing edge members, with respect to said direction of rotation, defining between them extrusion openings for facing the peripheral sur-face of the tire carcass, the trailing edge members defining the profile of the layer of tread material to be extruded onto ~ .
7;~4 the tire carcass, and the trailing edge member of the central outlet extending beyond the leading edge member thereof in the direction of flow of tread material through the central outlet so that, in use, a gap is formed between the leading edge mem-ber and the tire carcass through which tread material can es-cape upstream, with respect to said direction of rotation, of the central outlet to provide additional tread material for application to the tire carcass when required.
The following is a description of a specific embodi-ment of the invention, reference being made to the accompanyingdrawings, in which:
Figure 1 is a perspective view of the apparatus of the present invention, illustrating the application of an under-tread layer to a tire carcass;
15Figure 2 is a perspective view of a die incorporated in the apparatus of this invention;
Figure 3 is an exploded perspective view of the die of Figure 2;
Figure 4 is an elevation view, taken from the posi-tion of a tire, of the die of Figures 2 and 3;
Figure 5 is a plan view, in section and partially in phantom, taken substantially along the line 5-5 in Figure 2;
Figure 6 is an elevation view taken substantially along the line 6--6 in Figure l; and 25Figure 7 is an enlarged elevation view, taken sub-stantially along the line 7-7 in Figure 2.
While the apparatus of the present invention will be described hereinafter with more particular :reference to the ~,~, .. .
~ 7{
~10()724 accomp^-ny ~g drawin~s, lt is to be recognised at the outset of the following description that this invention contemplates the apparatus may take specific forms varying from that which is shown and will be described. Accordingly, the following description is to be taken as a broad teaching intended as permitting persons skilled in the applicable arts to apply this invention, and is not to be taken as restrictive on the scope of the invention.
Referring now more particularly to Figure 1, an extruder means generally indicated at 10 su~plies tread material 11 (Figure 6) under pressure and expels such materials for forming a layer 12 on peripheral surfaces of a tire carcass 14. The extruder 10 is the type having a plurality of extruder barrels and a delivery valve which will permit rubber to be expelled successively from alternating ones of the barrels. Alternatively an appropriate screw extruder may be used. The tread material preferably is a compound of natural rubber such as has heretofore been preparea for mold retreading of tires. As will be understood by persons skilled in the applicable arts, reloading one bar~el of the extruder 10 while others are being prepared or are delivering tread material will permit substantially continuous extrusion - of tread material in whatever quantity is required. Further, control over pressures employed to deliver or expel extruded tread material will provide control over the rate of expulsion of such material.
The apparatus of this invention additionally includes tire stand means generally indicated at 15 which includes suitable drive means (not shown) for r~tating a tire 1~ under-- going renewal. The tire stand means 15 rotatably supports 11007;~4 the tire 1~ in spaced relation from the extruder means 10.
The Iollowlng more specific des~ription will be directed particularly to the renewal of an off-the-road, heavy duty lugged tread tire. However, it is to be noted that the structure to be described is usable in conne~tion with rene-~l or manufacture of any vehicle tir~e or wheel and is not to be taken as limited to the specific applicatio-n described in some detail.
Mounted on the extru.der means 10 is a die means generally i0 indicated at 18 which directs undertread material 11 expelled from the extruder 10 directly onto peripheral surfaces of a rotating tire carcass mounted on the tire stand means 14. To the end of simultaneously forming an undertread layer encir-cling a rotating tire carcass and bonding the layer to the .~ 15 carcass, the die means engages peripheral surfaces of the tire carcass during rotation thereof by the tire stand means 15.
: Additionally, the die means 18, as pointed out more fully hereinafter, cooperates with an engaged tire carcass in defining bank areas for temporarily accumulating expelled undertread mat~rial and for ma.intaining durlng ~ormation of the undertread layer 12 a bank of undertread material from which carcass nor-uniformities are filled.
The die means 18 as shwon more clearly in ~igur~s 2-5 and 7 includes main body members 207 21, heater plate members 22, 23, a modulator plate 25 and a trailing edge member 26. The die means additior.ally includes right and left wing elemen-ts 28, 29 and a plurality of reinforcing members 3Q which span the body members 20, 21 upon the die means 18 being assembled.
Preferably, the heater plate elements 22, 2~ incorporate 5.
. . .
.
~ . , . .:
ll()U724 electrical resista.nce heating elements which facilitate maintenance of ready flowability for undertrea.d ma-terial being extruded through the die means 18. As will be appreciated, heat generated by the electrical resistance elements is con-ducted to the other elements of the die means 18.
The modulator plate 25 and the trailing edge member 26 cooperate with peripheral su~faces of a rotating tire carcass 14 in certain important ways in facilitating ready formation of the desired undertread layer. More particularly, the modulator 25 includes a generally transversely extending barrier element 31 and a forward edge 32 spaced from the barrier 31. The barrier 31 is configured to have its greatest height in a medial portion of the modulatGr 25 ~ (Figure 4) and to taper outwardly therefrom toward side edge - 15 or wing portions. The forward edge 32 of the modulator 25 bears spaced relation to the trailing edge member 26 and to the peripheral surface of a tire carcass 14, as shown more clearly in Flgure 6. More particularly, the trailing edge member 26 more closely approaches the peripheral surface of a tire carcass than does the leading edge 32 pro~-ided by the moaulator plate 25. ~uch an arrangement accommodates a spill-ov~r of expelled undertrea.d material from the location of application against the peripheral surface of the rotating tire carcass 14 (Figure 6) opposi-te the direction of tire car-: 25 cass rotation and upstrsam of the leading edge thereby providing for the accumulation and maintenance of a rolling bank of und.ertread material as will be pointed out more fully hereinafter.
The wing elements 28, 29 of the die means 1~ are mounted 110(~7;~4 for wid',h~ise adiustmen,, relatlve to the die means 18, preferably ~cccm~lished by the provision of respective rac~
gears 35, ~6`and cooper~ting pinions 37, 38. By manual rotation of the pinions, the wing elements may be moved uo-gether or apart to accommodate varying widths of tire carcasses being renewed. In use, the wing elements 28, 29 are brought into engagement with sidewall portions of the peripheral surface of a tire carcass undergoing renewal (Eigure 5).
In accordance with further important features of the &pparatus of this invention; it will be noteA that each of the wi.ng elements 28, 29 includes trailing and leading edge members 28A, 28B, 29A, 29~. Each pair of edge members are spaced apart by dimensions slightly greater than the ~ertical dista~nce between the edges defined by the trailing edge , element 26 and the modulator 25 (~ res 2 and 6). Further, each pair of spaced apart members define therebetween a volume or area throl,~h which undertread material passes in forming wing portions of an lmdertread layer (Figures 1 and 5). Each of the volumes or areas thus defined functions as a bank area in filllng carcass sidewall irregularities. As w;.ll be noted, the configuration of the barrier 31 of the modulator means 25 : assures feeding of expelled undertread material into the side-wall bank areas, due to the angulation and decreasing vertic21 height thereof (Ei,gures 4 and 5).
In use, a tlre 14 undergoing renewal is mounted on the tire stand 15, brought into position adjacent the die means 18, and the wirg portions 28,29 are adjusted if required to assure the desired engagement between the die means 18 and the tire 14. Extrusion of undertread material 11 is then begun, and 7.
110(J7Z4 the tire 14 is driven in rotation. As will be appreciated, rotation of the tire 14 during extrusion of undertread material 11 will cause an undertread layer to be formed about and bonded to the periphery of the tire carcass 15. ~Jhile the depth of t'ne cro~m surface portion of the undertread layer 12 and the overall radius thereof are determined in part by the spacing of the center of rotation of the tire 14 from the trailing edge member 26 of the die 18, the uniformity of supp~y of material to form that layer is determined by the charac-teristics of the modulator means 25 and the wing elements 28,~29 described hereinabove.
As will be appreciated, an additional factor controlling the thickness and radial dimensions of the undertread layer 12 is the comparative rate of rotation of the tire 14 and rate of delivery of undertread material 11 by the extruder 10.
Relatively fast rotation of the tire 14 and relatively slow delivery of undertread material 16 may lead to an unduly thin unaertread layer 12. In fact, and as a signi~icant feature of this invention, the structural characteristics of the modulator plate 25, trailing edge member 26 and wing elements 28, 29 accommodate accumulation of a bank of undertread material a~jacent the point of application of such material to the tire carcass 14. Thus, skived portions causing irregu-larities in the surface of the tire carcass 14 (as indicated in Figure 6) may readily be fi7led while the deslred contour of the finished undertread layer is obtained. Ad~itionally, achie~ement of a more uniform rolling radius for the rebuilt tire is facilitated.
Formation of an undertread layer on the tire carcass 14 ' 8.
' ,- :
110(~72~
may be followed by the application of lugs thereto and curing of the lugs ln accordance with the method pointed out above as being subject to separate protection.
In the drawings and specification, there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.
The invention provides appara-tus for extruding uncured tread material onto a peripheral surface of a tire carcass comprising:
extruder means for expelling tread material under pressure, tire stand means for supporting a tire carcass in spaced relation to said extruder means for rotation of the tire carcass in one direction during extrusion, die means mounted on said extruder means for direc~ing expelled tread material di-rectly onto a peripheral surface of a tire carcass supported by said tire stand means, and rotating in said one direction to form a layer encircling the tire carcass and simultaneously to bond the layer to the carcass, the die means having a central outlet for directing tread material onto a crown portion of the peripheral surface of the tire and two wing elements located one on either side of the central outlet and facing towards each other to direct tread material onto side-wall portions of the peripheral surface of the tire carcass to either side of the crown portion, and modulator means located in the die means for controlling the distribution of flow of tread material through the die means to tend to divert the tread material towards the wing elements of the die means, the central outlet and wing elements of the die means each having leading and trailing edge members, with respect to said direction of rotation, defining between them extrusion openings for facing the peripheral sur-face of the tire carcass, the trailing edge members defining the profile of the layer of tread material to be extruded onto ~ .
7;~4 the tire carcass, and the trailing edge member of the central outlet extending beyond the leading edge member thereof in the direction of flow of tread material through the central outlet so that, in use, a gap is formed between the leading edge mem-ber and the tire carcass through which tread material can es-cape upstream, with respect to said direction of rotation, of the central outlet to provide additional tread material for application to the tire carcass when required.
The following is a description of a specific embodi-ment of the invention, reference being made to the accompanyingdrawings, in which:
Figure 1 is a perspective view of the apparatus of the present invention, illustrating the application of an under-tread layer to a tire carcass;
15Figure 2 is a perspective view of a die incorporated in the apparatus of this invention;
Figure 3 is an exploded perspective view of the die of Figure 2;
Figure 4 is an elevation view, taken from the posi-tion of a tire, of the die of Figures 2 and 3;
Figure 5 is a plan view, in section and partially in phantom, taken substantially along the line 5-5 in Figure 2;
Figure 6 is an elevation view taken substantially along the line 6--6 in Figure l; and 25Figure 7 is an enlarged elevation view, taken sub-stantially along the line 7-7 in Figure 2.
While the apparatus of the present invention will be described hereinafter with more particular :reference to the ~,~, .. .
~ 7{
~10()724 accomp^-ny ~g drawin~s, lt is to be recognised at the outset of the following description that this invention contemplates the apparatus may take specific forms varying from that which is shown and will be described. Accordingly, the following description is to be taken as a broad teaching intended as permitting persons skilled in the applicable arts to apply this invention, and is not to be taken as restrictive on the scope of the invention.
Referring now more particularly to Figure 1, an extruder means generally indicated at 10 su~plies tread material 11 (Figure 6) under pressure and expels such materials for forming a layer 12 on peripheral surfaces of a tire carcass 14. The extruder 10 is the type having a plurality of extruder barrels and a delivery valve which will permit rubber to be expelled successively from alternating ones of the barrels. Alternatively an appropriate screw extruder may be used. The tread material preferably is a compound of natural rubber such as has heretofore been preparea for mold retreading of tires. As will be understood by persons skilled in the applicable arts, reloading one bar~el of the extruder 10 while others are being prepared or are delivering tread material will permit substantially continuous extrusion - of tread material in whatever quantity is required. Further, control over pressures employed to deliver or expel extruded tread material will provide control over the rate of expulsion of such material.
The apparatus of this invention additionally includes tire stand means generally indicated at 15 which includes suitable drive means (not shown) for r~tating a tire 1~ under-- going renewal. The tire stand means 15 rotatably supports 11007;~4 the tire 1~ in spaced relation from the extruder means 10.
The Iollowlng more specific des~ription will be directed particularly to the renewal of an off-the-road, heavy duty lugged tread tire. However, it is to be noted that the structure to be described is usable in conne~tion with rene-~l or manufacture of any vehicle tir~e or wheel and is not to be taken as limited to the specific applicatio-n described in some detail.
Mounted on the extru.der means 10 is a die means generally i0 indicated at 18 which directs undertread material 11 expelled from the extruder 10 directly onto peripheral surfaces of a rotating tire carcass mounted on the tire stand means 14. To the end of simultaneously forming an undertread layer encir-cling a rotating tire carcass and bonding the layer to the .~ 15 carcass, the die means engages peripheral surfaces of the tire carcass during rotation thereof by the tire stand means 15.
: Additionally, the die means 18, as pointed out more fully hereinafter, cooperates with an engaged tire carcass in defining bank areas for temporarily accumulating expelled undertread mat~rial and for ma.intaining durlng ~ormation of the undertread layer 12 a bank of undertread material from which carcass nor-uniformities are filled.
The die means 18 as shwon more clearly in ~igur~s 2-5 and 7 includes main body members 207 21, heater plate members 22, 23, a modulator plate 25 and a trailing edge member 26. The die means additior.ally includes right and left wing elemen-ts 28, 29 and a plurality of reinforcing members 3Q which span the body members 20, 21 upon the die means 18 being assembled.
Preferably, the heater plate elements 22, 2~ incorporate 5.
. . .
.
~ . , . .:
ll()U724 electrical resista.nce heating elements which facilitate maintenance of ready flowability for undertrea.d ma-terial being extruded through the die means 18. As will be appreciated, heat generated by the electrical resistance elements is con-ducted to the other elements of the die means 18.
The modulator plate 25 and the trailing edge member 26 cooperate with peripheral su~faces of a rotating tire carcass 14 in certain important ways in facilitating ready formation of the desired undertread layer. More particularly, the modulator 25 includes a generally transversely extending barrier element 31 and a forward edge 32 spaced from the barrier 31. The barrier 31 is configured to have its greatest height in a medial portion of the modulatGr 25 ~ (Figure 4) and to taper outwardly therefrom toward side edge - 15 or wing portions. The forward edge 32 of the modulator 25 bears spaced relation to the trailing edge member 26 and to the peripheral surface of a tire carcass 14, as shown more clearly in Flgure 6. More particularly, the trailing edge member 26 more closely approaches the peripheral surface of a tire carcass than does the leading edge 32 pro~-ided by the moaulator plate 25. ~uch an arrangement accommodates a spill-ov~r of expelled undertrea.d material from the location of application against the peripheral surface of the rotating tire carcass 14 (Figure 6) opposi-te the direction of tire car-: 25 cass rotation and upstrsam of the leading edge thereby providing for the accumulation and maintenance of a rolling bank of und.ertread material as will be pointed out more fully hereinafter.
The wing elements 28, 29 of the die means 1~ are mounted 110(~7;~4 for wid',h~ise adiustmen,, relatlve to the die means 18, preferably ~cccm~lished by the provision of respective rac~
gears 35, ~6`and cooper~ting pinions 37, 38. By manual rotation of the pinions, the wing elements may be moved uo-gether or apart to accommodate varying widths of tire carcasses being renewed. In use, the wing elements 28, 29 are brought into engagement with sidewall portions of the peripheral surface of a tire carcass undergoing renewal (Eigure 5).
In accordance with further important features of the &pparatus of this invention; it will be noteA that each of the wi.ng elements 28, 29 includes trailing and leading edge members 28A, 28B, 29A, 29~. Each pair of edge members are spaced apart by dimensions slightly greater than the ~ertical dista~nce between the edges defined by the trailing edge , element 26 and the modulator 25 (~ res 2 and 6). Further, each pair of spaced apart members define therebetween a volume or area throl,~h which undertread material passes in forming wing portions of an lmdertread layer (Figures 1 and 5). Each of the volumes or areas thus defined functions as a bank area in filllng carcass sidewall irregularities. As w;.ll be noted, the configuration of the barrier 31 of the modulator means 25 : assures feeding of expelled undertread material into the side-wall bank areas, due to the angulation and decreasing vertic21 height thereof (Ei,gures 4 and 5).
In use, a tlre 14 undergoing renewal is mounted on the tire stand 15, brought into position adjacent the die means 18, and the wirg portions 28,29 are adjusted if required to assure the desired engagement between the die means 18 and the tire 14. Extrusion of undertread material 11 is then begun, and 7.
110(J7Z4 the tire 14 is driven in rotation. As will be appreciated, rotation of the tire 14 during extrusion of undertread material 11 will cause an undertread layer to be formed about and bonded to the periphery of the tire carcass 15. ~Jhile the depth of t'ne cro~m surface portion of the undertread layer 12 and the overall radius thereof are determined in part by the spacing of the center of rotation of the tire 14 from the trailing edge member 26 of the die 18, the uniformity of supp~y of material to form that layer is determined by the charac-teristics of the modulator means 25 and the wing elements 28,~29 described hereinabove.
As will be appreciated, an additional factor controlling the thickness and radial dimensions of the undertread layer 12 is the comparative rate of rotation of the tire 14 and rate of delivery of undertread material 11 by the extruder 10.
Relatively fast rotation of the tire 14 and relatively slow delivery of undertread material 16 may lead to an unduly thin unaertread layer 12. In fact, and as a signi~icant feature of this invention, the structural characteristics of the modulator plate 25, trailing edge member 26 and wing elements 28, 29 accommodate accumulation of a bank of undertread material a~jacent the point of application of such material to the tire carcass 14. Thus, skived portions causing irregu-larities in the surface of the tire carcass 14 (as indicated in Figure 6) may readily be fi7led while the deslred contour of the finished undertread layer is obtained. Ad~itionally, achie~ement of a more uniform rolling radius for the rebuilt tire is facilitated.
Formation of an undertread layer on the tire carcass 14 ' 8.
' ,- :
110(~72~
may be followed by the application of lugs thereto and curing of the lugs ln accordance with the method pointed out above as being subject to separate protection.
In the drawings and specification, there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED IS FOLLOWS:
1. Apparatus for extruding uncured tread material onto a peripheral surface of a tire carcass comprising:
extruder means for expelling tread material under pressure, tire stand means for supporting a tire carcass in spaced relation to said extruder means for rotation of the tire carcass in one direction during extrusion, die means mounted on said extruder means for directing expelled tread material di-rectly onto a peripheral surface of a tire carcass supported by said tire stand means and rotating in said one direction to form a layer encircling the tire carcass and simultaneously to bond the layer to the carcass, the die means having a central outlet for directing tread material onto a crown portion of the peri-pheral surface of the tire and two wing elements located one on either side of the central outlet and facing towards each other to direct tread material onto side-wall portions of the peri-pheral surface of the tire carcass to either side of the crown portion, and modulator means located in the die means for con-trolling the distribution of flow of tread material through the die means to tend to divert the tread material towards the wing elements of the die means, the central outlet and wing elements of the die means each having leading and trailing edge members, with respect to said direction of rotation, defining between them extrusion openings for facing the peripheral surface of the tire carcass, the trailing edge members defining the pro-file of the layer of tread material to be extruded onto the tire carcass, and the trailing edge member of the central outlet extending beyond the leading edge member thereof in the direc-tion of flow of tread material through the central outlet so that, in use, a gap is formed between the leading edge member and the tire carcass through which tread material can escape upstream, with respect to said direction of rotation, of the central outlet to provide additional tread material for appli-cation to the tire carcass when required.
extruder means for expelling tread material under pressure, tire stand means for supporting a tire carcass in spaced relation to said extruder means for rotation of the tire carcass in one direction during extrusion, die means mounted on said extruder means for directing expelled tread material di-rectly onto a peripheral surface of a tire carcass supported by said tire stand means and rotating in said one direction to form a layer encircling the tire carcass and simultaneously to bond the layer to the carcass, the die means having a central outlet for directing tread material onto a crown portion of the peri-pheral surface of the tire and two wing elements located one on either side of the central outlet and facing towards each other to direct tread material onto side-wall portions of the peri-pheral surface of the tire carcass to either side of the crown portion, and modulator means located in the die means for con-trolling the distribution of flow of tread material through the die means to tend to divert the tread material towards the wing elements of the die means, the central outlet and wing elements of the die means each having leading and trailing edge members, with respect to said direction of rotation, defining between them extrusion openings for facing the peripheral surface of the tire carcass, the trailing edge members defining the pro-file of the layer of tread material to be extruded onto the tire carcass, and the trailing edge member of the central outlet extending beyond the leading edge member thereof in the direc-tion of flow of tread material through the central outlet so that, in use, a gap is formed between the leading edge member and the tire carcass through which tread material can escape upstream, with respect to said direction of rotation, of the central outlet to provide additional tread material for appli-cation to the tire carcass when required.
2. An apparatus as claimed in Claim 1, wherein said modulator means comprises a barrier extending transversely of the die means for restricting flow of expelled tread material through the central outlet of the die means to tend to divert portions of the material towards the wing elements of the die means.
3. An apparatus as claimed in Claim 2, wherein the height of the barrier is greatest at the centre of the die means, and the barrier tapers towards the ends thereof past which tread material is to be supplied to the wing elements.
4. An apparatus as claimed in Claim 1, wherein the wing elements of the die means are mounted for adjustment across the central outlet to vary the spacing of the wing elements to suit tires of differing cross-sectional widths.
5. An apparatus as claimed in Claim 4, wherein means are provided for adjusting the spacing of the wing elements across the central outlet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB31097/76 | 1976-07-26 | ||
| GB31097/76A GB1590378A (en) | 1976-07-26 | 1976-07-26 | Apparatus for applying tread material to tyres |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1100724A true CA1100724A (en) | 1981-05-12 |
Family
ID=10317928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA282,920A Expired CA1100724A (en) | 1976-07-26 | 1977-07-18 | Apparatus and methods for applying tread material to tyres |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS5314780A (en) |
| AU (1) | AU514823B2 (en) |
| BG (1) | BG29276A3 (en) |
| BR (1) | BR7704879A (en) |
| CA (1) | CA1100724A (en) |
| DE (1) | DE2733518A1 (en) |
| ES (1) | ES461025A1 (en) |
| FI (1) | FI772275A (en) |
| FR (1) | FR2359700A1 (en) |
| GB (1) | GB1590378A (en) |
| GR (1) | GR71899B (en) |
| MX (1) | MX144364A (en) |
| NZ (1) | NZ184686A (en) |
| PT (1) | PT66827B (en) |
| SU (1) | SU665787A3 (en) |
| TR (1) | TR19803A (en) |
| ZA (1) | ZA774323B (en) |
| ZM (1) | ZM5777A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539169A (en) * | 1983-07-29 | 1985-09-03 | The Goodyear Tire & Rubber Company | Apparatus and method for forming a co-extrusion from extruded strips |
| US5017118A (en) * | 1989-06-16 | 1991-05-21 | The Goodyear Tire & Rubber Company | Apparatus for forming a coextrusion from extruded strips |
| FR2648388B1 (en) * | 1989-06-16 | 1992-09-04 | Goodyear Tire & Rubber | EXTRUSION APPARATUS WITH ROLLER DIE, PARTICULARLY FOR A COEXTRUDED ELEMENT FOR A TIRE |
| US5342473A (en) * | 1991-08-20 | 1994-08-30 | Nrm Steelastic, Inc. | Apparatus for applying hot cushion gum to a tire carcass |
| JP3851347B2 (en) * | 1993-08-05 | 2006-11-29 | アーツェット フォルメン−ウント マシーネンバウ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Retrending device |
| DE4326370A1 (en) * | 1993-08-05 | 1995-02-09 | Az Formen & Maschbau Gmbh | Retreading device |
| DE29612955U1 (en) * | 1996-07-25 | 1996-09-19 | Az Formen & Maschbau Gmbh | Retreading device |
| DE10020414B4 (en) | 2000-04-26 | 2004-02-12 | A-Z Formen- Und Maschinenbau Gmbh | Tread application device |
| US20040089400A1 (en) * | 2002-11-08 | 2004-05-13 | Vargo Richard David | Method and apparatus for forming an annular elastomeric tire component |
| US7780809B2 (en) | 2005-08-04 | 2010-08-24 | The Goodyear Tire & Rubber Company | Method for forming elastomeric tire component and a tire |
| CN106393761A (en) * | 2015-08-10 | 2017-02-15 | 青岛软控机电工程有限公司 | Intermediate cushion rubber extruder |
| CN113021861B (en) * | 2021-03-24 | 2022-12-27 | 山东省三利轮胎制造有限公司 | Forming equipment for tyre thread |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1353903A (en) * | 1970-05-07 | 1974-05-22 | Barwell Eng Ltd | Methods and apparatus for treading tyres or wheels |
| NL7117641A (en) * | 1971-12-22 | 1973-06-26 | Retreading tyres - by applying hot, plastic rubber shading with die, and vulcanising | |
| US3871810A (en) * | 1972-11-20 | 1975-03-18 | Uniroyal Inc | Extruder and roller-die combination |
| US3956056A (en) * | 1972-11-20 | 1976-05-11 | Uniroyal Inc. | Fabric coating by extrusion die-calendering apparatus and method |
-
1976
- 1976-07-26 GB GB31097/76A patent/GB1590378A/en not_active Expired
-
1977
- 1977-07-18 CA CA282,920A patent/CA1100724A/en not_active Expired
- 1977-07-19 AU AU27135/77A patent/AU514823B2/en not_active Expired
- 1977-07-19 ZA ZA00774323A patent/ZA774323B/en unknown
- 1977-07-19 NZ NZ184686A patent/NZ184686A/en unknown
- 1977-07-20 ZM ZM57/77A patent/ZM5777A1/en unknown
- 1977-07-20 PT PT66827A patent/PT66827B/en unknown
- 1977-07-22 BG BG7736984A patent/BG29276A3/en unknown
- 1977-07-25 BR BR7704879A patent/BR7704879A/en unknown
- 1977-07-25 FI FI772275A patent/FI772275A/fi not_active Application Discontinuation
- 1977-07-25 TR TR19803A patent/TR19803A/en unknown
- 1977-07-25 JP JP8913177A patent/JPS5314780A/en active Pending
- 1977-07-25 DE DE19772733518 patent/DE2733518A1/en not_active Withdrawn
- 1977-07-25 MX MX169970A patent/MX144364A/en unknown
- 1977-07-25 SU SU772512602A patent/SU665787A3/en active
- 1977-07-26 ES ES461025A patent/ES461025A1/en not_active Expired
- 1977-07-26 FR FR7722974A patent/FR2359700A1/en active Granted
-
1981
- 1981-01-08 GR GR54034A patent/GR71899B/el unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2359700B1 (en) | 1982-07-30 |
| ZM5777A1 (en) | 1978-03-21 |
| AU514823B2 (en) | 1981-02-26 |
| PT66827B (en) | 1978-12-27 |
| SU665787A3 (en) | 1979-05-30 |
| DE2733518A1 (en) | 1978-02-09 |
| MX144364A (en) | 1981-10-05 |
| BG29276A3 (en) | 1980-10-15 |
| GB1590378A (en) | 1981-06-03 |
| PT66827A (en) | 1977-08-01 |
| NZ184686A (en) | 1981-03-16 |
| BR7704879A (en) | 1978-04-25 |
| JPS5314780A (en) | 1978-02-09 |
| TR19803A (en) | 1979-12-28 |
| GR71899B (en) | 1983-08-11 |
| FI772275A (en) | 1978-01-27 |
| FR2359700A1 (en) | 1978-02-24 |
| AU2713577A (en) | 1979-01-25 |
| ES461025A1 (en) | 1978-05-16 |
| ZA774323B (en) | 1978-09-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |