Roller die extrusion and calendering apparatus

A roller die extrusion apparatus for forming a strip of elastomeric material comprising a roller with an axis circumvented by a roller surface, means for rotating said roller about said axis, an extruder for mixing and plasticizing said elastomeric material under pressure, a nozzle portion at an outlet end of said extruder for extruding said elastomeric material under pressure onto said roller surface, a die plate connected to said extruder at said nozzle portion and extending along said roller surface downstream of said nozzle portion, said die plate having a surface with a groove defining a passageway with said roller surface for initially shaping said elastomeric strip, a calender roll positioned downstream of said die plate, said calender roll including a sleeve mounted on said roll and having a calender surface in close proximity to said roller surface providing a finishing gap for finally shaping said strip of elastomeric material.

A roller die extrusion apparatus for forming a strip of elastomeric material comprising a roller with an axis circumvented by a roller surface, means for rotating said roller about said axis, an extruder for mixing and plasticizing said elastomeric material under pressure, a nozzle portion at an outlet end of said extruder for extruding said elastomeric material under pressure onto said roller surface, a die plate connected to said extruder at said nozzle portion and extending along said roller surface downstream of said nozzle portion for initially shaping said elastomeric strip, said extruder having a cylinder, a screw rotatable in said cylinder for mixing and plasticizing said elastomeric material, said screw having a downstream end at said outlet extending through said nozzle portion to a position adjacent said roller for feeding said elastomeric material directly onto said roller surface and providing self-cleaning of said apparatus and a calender roll positioned downstream of said die plate, said calender roll having a calender surface in close proximity to said roller surface providing a finishing gap for finally shaping said strip of elastomeric material.

A roller die extrusion apparatus for forming a strip of elastomeric material comprising a roller with an axis circumvented by a roller surface, means for rotating said roller about said axis, an extruder for mixing and plasticizing said elastomeric material under pressure, said extruder having a cylinder, a screw rotatable in said cylinder for mixing and plasticizing said elastomeric material, a nozzle portion at an outlet end of said extruder for extruding said elastomeric material under pressure onto said roller surface, a die plate connected to said extruder at said nozzle portion and extending along said roller surface downstream of said nozzle portion, said die plate having a surface with a groove defining a passageway with said roller surface for initially shaping said elastomeric strip, and said screw having a downstream end at said outlet extending through said nozzle portion to a position adjacent said roller for feeding said elastomeric material directly onto said roller surface and providing self-cleaning of said apparatus.