Multiple layer extrusion tooling having a tip enabling extrusion of one layer onto a substrate at a point outside of the extrusion head
AssigneeSouthwire Company
InventorRoy E. Sullivan
Life of this patent
Estimating the term…
Abstract
Disclosed is an apparatus and method for extruding primary insulation and insulation shielding onto an advancing shielded conductor strand in one operation without causing inward protrusions of insulation shielding compound particles into the primary insulation comprising an extruder head with a starter tip, an antiprotrusion tip and a die.
Claims19
An apparatus for extruding primary insulation and insulation shielding onto an advancing shielded conductor strand in one operation without causing inward protrusions of insulation shielding compound particles into the primary insulation comprising:
- an extruder head housing means having a shielded conductor strand entrance, said extruder head including means for accepting primary insulation compound from a first extruder, means for accepting insulation shield compound from a second extruder, means for adjusting the concentricity of said shielded conductor strand, said primary insulation and said insulation shielding, and a cable exit;
- an inner tip means mounted in said head housing and near said shield conductor entrance for accepting said advancing shielded conductor strand and guiding said shielded conductor strand along a predetermined straight path, said inner tip means also being adapted to guide the flow of primary insulation compound through said head housing and toward said shielded conductor strand;
- an antiprotrusion tip means having an inner and outer surface mounted in said housing and in combination with said inner tip means, said antiprotrusion tip means partially surrounding said inner tip with the inner surface of said antiprotrusion tip thereby cooperating with said inner tip to guide said primary insulation compound toward and onto said shielded conductor strand in a first extrusion plane as said outer surface of said antiprotrusion tip smooth the primary insulation side surface of an insulation shielding compound and guides it toward the advancing shielded and insulated conductor, and having a tubular extension with an inner circumference equal to the expected circumference of the primary insulation and an outer circumference approximately equal to that of the finished product concentric to the longitudinal axis of said predetermined straight path and extending out from said extrusion head to define said cable exit and the point advanced in the direction of material flow from said first extrusion plane at which the smooth surface of the insulation shielding compound is applied in a second extrusion plane to the primary insulation surface of the advancing shielded conductor.
An apparatus for the tandem concentric extrusion of primary insulation and insulation shielding onto an advancing shielded conductor strand in one operation without causing inward protrusions of insulation shielding compound particles into the primary insulation comprising:
- means for advancing the shielded conductor strand along a predetermined straight path through an extruder head housing means comprising a starter tip;
- means for extruding a primary insulation onto said advancing shielded conductor strand in a first extrusion plane;
- and
- means including a die for simultaneously extruding an ironed insulation shield onto said advancing shielded conductor strand in a second extrusion plane at a point advanced in the direction of material flow from said first extrusion plane, said means comprising an antiprotrusion tip which causes undispersed particles projecting from said insulation side surface to be reabsorbed into the polymer matrix of said insulation shielding thereby preventing the piercing of said insulation by said particles.
A method for the tandem concentric extrusion of primary insulation and insulation shielding onto an advancing shielded conductor strand in one operation without causing inward protrusions of insulation shielding compound particles into the primary insulation comprising:
- advancing the shielded conductor strand along a predetermined straight path through an extruder head housing means comprising a starter tip;
- extruding, through a means including a die, a primary insulation onto said advancing shielded conductor strand in a first extrusion plane;
- and
- simultaneously extruding an ironed insulation shield onto said advancing shielded conductor strand in a second extrusion plane at a point advanced in the direction of material flow from said first extrusion plane through use of an antiprotrusion tip which causes undispersed particles projecting from the insulation side surface of the insulation shield to be reabsorbed into the polymer matrix of said insulating shielding to prevent piercing of said insulation by said particles.
Dependencies are inferred from the claim text.