# US 2013/0154142 A1 · Conicity correction for rubber component extrusion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154142 A1 - Document ID: US20130154142A1 - Status: Published application - Kind: A1 - Application number: 13/556,266 - Filed: 2012-07-24 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Inventors: Warren Paul Ripple - Web page: https://patentgrep.com/patent/US20130154142A1 ## CPC - B29D 30/52: Unvulcanised treads, e.g. on used tyres; Retreading (apparatus for forming {treads by extrusion B29C48/00; apparatus for} vulcanising treads B29C35/02; apparatus characterised by the means for holding wheels or parts thereof B60B30/00) - B29C 48/05: Filamentary, e.g. strands - B29C 48/19: the layers being joined at their edges - B29C 48/305: having a wide opening, e.g. for forming sheets - B29C 48/307: {specially adapted for bringing together components, e.g. melts within the die} - B29C 48/395: using screws surrounded by a cooperating barrel, e.g. single screw extruders - B29C 48/49: using two or more extruders to feed one die or nozzle - B29C 48/872: {characterised by differential heating or cooling} - B29C 48/92: Measuring, controlling or regulating - B29C 48/0022: {combined with cutting} - B29C 48/07: Flat, e.g. panels - B29C 48/12: Articles with an irregular circumference when viewed in cross-section, e.g. window profiles - B29C 48/21: the layers being joined at their surfaces - B29C 48/255: Flow control means, e.g. valves (flow dividers B29C48/695) - B29C 48/695: Flow dividers, e.g. breaker plates - B29C 2948/92152: Thickness - B29C 2948/92171: Distortion, shrinkage, dilatation, swell or warpage - B29C 2948/9218: Weight - B29C 2948/9219: Density, e.g. per unit length or area - B29C 2948/92704: Temperature - B29C 2948/92904: Die; Nozzle zone - B29D 2030/526: {the tread comprising means for discharging the electrostatic charge, e.g. conductive elements or portions having conductivity higher than the tread rubber} - B29L 2030/002: {Treads} - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - 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 (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A system for extruding one or more tread strips is described. The system includes an extruder having an outlet end connected to an extruder head for forming an elastomeric strip to a predetermined cross-sectional profile. The extruder head has an internal flow channel having an inlet end and an outlet end, wherein the flow channel has a first temperature zone and a second temperature zone. The temperature zones are used to adjust the conicity of the tread strips. ## Claims ### Claim 1 A system comprising an extruder having an outlet end connected to an extruder head for forming an elastomeric strip to a predetermined cross-sectional profile, the extruder head having an internal flow channel having an inlet end and an outlet end, wherein said flow channel has a first temperature zone and a second temperature zone, Said extruder flow channel having one or more coolant passages, all having an inlet end and an outlet end for circulating a coolant therein, wherein said one or more coolant passages are located adjacent said flow channel and forming a first temperature zone. ### Claim 2 (depends on 1) The system of claim 1 wherein the outlet end of the one or more water passages are in fluid communication with a heating means for heating the coolant. ### Claim 3 (depends on 1) The system of claim 1 wherein the outlet end of the one or more coolant passages are in fluid communication with a cooling means for cooling the coolant ### Claim 4 (depends on 1) The system of claim 1 wherein the second temperature zone is further defined by one or more coolant passages connected together and having an inlet end and an outlet end. ### Claim 5 (depends on 1) The system of claim 1 wherein the first temperature zone and the second temperature zone are separated by the longitudinal axis of the flow channel. ### Claim 6 A method for adjusting the conicity of an extrudate comprising the steps of: extruding an elastomeric strip through an extruder into a flow channel and through a profile die, wherein the flow channel has a first and second temperature zone; Measuring the conicity of the extruded elastomeric strip; adjusting the temperature of at least one of the first and second temperature zones if the conicity is not within specified tolerances, and then repeating the above steps until the conicity is within the specified tolerances. ### Claim 7 A system for extruding dual tread strips of elastomer to a predetermined profile, the system comprising: an extruder having an outlet end connected to an extruder flow head for forming at least two elastomeric tread strips to a predetermined cross-sectional profile, the extruder flow head having internal rubber flow channels, each having an inlet end and an outlet end, wherein said flow channel has a first temperature zone on controlling an outside portion of the flow channels and a second temperature zone controlling the middle of the flow channels, wherein resides a rubber flow splitter for splitting the flow into two rubber streams, and lastly the rubber flow channels have a third temperature controlled zone controlling the other outside portion of the rubber flow channel. Said extruder head tongue having multiple water passages having an inlet end and an outlet ends for circulating water therein, wherein said one or more water passages are located adjacent, such that the rubber flow channels located above and below the extruder head tongue are broken up into three temperature controlled zones by the interaction of the flow channels with the extruder head tongue.