Extrusion die for forming composite rubber-cord strip
AssigneeThe Firestone Tire & Rubber Company
InventorDonald G. Ible
Life of this patent
Estimating the term…
Abstract
A die structure for forming a composite rubber-cord strip is provided having a die throat whose aperture width at entry is greater than at exit, while its height at entry is smaller than at exit, thus providing a substantially constant cross-sectional area of the throat throughout; rubber is supplied to the entry along a path parallel to the cords, and from a cord guide whose hole spacing is greater than the cord spacing in the ply at the die exit.
Claims8
In an extrusion die-throat having a composite-forming aperture with an entry for advancing parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- and
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- said pairs of walls forming cross-sectional areas which remain substantially constant, and whose major dimensions remain in the same plane, from entry to exit.
In an extrusion die-throat having a composite-forming aperture with an entry for advancing parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- laterally spaced ramp-pairs adjacent the entry;
- and converging channels recessed between the ramps of each said pair.
In an extrusion die-structure having a die-throat with a composite-forming aperture having an entry for advancing parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- laterally spaced ramp-pairs converning upon the entry;
- a cord guide engaging said ramp-pairs;
- and
- a recess between the ramps of each said pair and forming with a respective side of said guide a channel for advancing elastomer.
In an extrusion die-throat having a composite-forming aperture with an entry for advancing parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- laterally spaced ramp-pairs converging upon the entry;
- and
- recesses between said ramp pairs forming converging channels for advancing elastomer;
- the cross-sectional area of the aperture remaining substantially constant from entry to exit.
In an extrusion die structure having a die-throat with a composite-forming aperture having an entry for advanging parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- two laterally spaced ramp-pairs converging upon the entry;
- a cord guide engaging said ramp-pairs;
- and
- recesses between the ramps of each said pair forming with a respective side of said guide a pair of converging channels for advancing elastomer;
- the cross-sectional area of the aperture remaining substantially constant throughout.
In an extrusion die-throat having a composite-forming aperture with an entry for advancing parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- and
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- said pairs of walls forming rectangular parallelogram cross sections whose major dimensions remain in the same plane from entry to exit.
In an extrusion die-throat having a composite-forming aperture with an entry for advancing parallel cords and elastomer and an exit for the composite, the improvement comprising
- a first pair of opposed aperture sidewalls converging from entry to exit;
- and
- a second pair of opposed upper and lower aperture walls diverging from entry to exit;
- said pairs of walls forming transversely elongated cross sections whose major dimensions remain in the same plane from entry to exit.
Dependencies are inferred from the claim text.