Device and method for making concrete expansion joint inserts
AssigneeJd Russell Company
InventorsCharles Snooks, Sr., Bradley Danna, Nicholas Danna, Marc Danna
Life of this patent
Estimating the term…
Abstract
An illustrative example embodiment of a method of making a concrete expansion joint insert includes moving a material including a resin having a melt temperature through a die having a flow passage that ends in an exit having a selected geometry, increasing a temperature of only a segment of the die near the exit to an elevated temperature that is at least 1.5 times the melt temperature, and increasing the temperature of a portion of the material to an increased temperature above the melt temperature through contact with the segment having the elevated temperature.
Claims10
A method of making a concrete expansion joint insert, the method comprising:
- moving a first material including a resin having a melt temperature through a die having a flow passage, the flow passage ending in an exit having a selected geometry, wherein the die comprises a ferrous segment formed with ferrous material and a remainder of the die comprises a non-ferrous material;
- increasing a temperature of only the ferrous segment of the die to an elevated temperature that is at least 1.5 times the melt temperature, wherein the ferrous segment is near the exit;
- and
- increasing the temperature of a portion of the first material to an increased temperature above the melt temperature through contact with interior sides of the flow passage through the die that correspond with location of the ferrous segment having the elevated temperature, wherein increasing the temperature comprises using induction heating by causing electrical current to flow along at least one conductor situated adjacent the ferrous segment.
Dependencies are inferred from the claim text.