Extrusion head with planarized edge surface
First Claim
1. A method for fabricating an extrusion head for a micro extrusion apparatus, the extrusion head having a plurality of fluidic channels for extruding material on a substrate, the method comprising:
- forming a first sheet such that the first sheet defines at least one reference surface and an extrusion cavity including an outlet region such that the reference surface is disposed in proximity to the outlet region;
securing the first sheet between second and third sheets to form said extrusion head such that the extrusion cavity and one or more of the second and third sheets form an associated fluidic channel, and such that side edges of the first, second and third sheets collectively form an edge surface of the extrusion head, wherein the side edge of the first sheet defines both an outlet orifice communicating with said outlet region of the extrusion cavity and a notch, wherein the reference surface is disposed in the notch such that the reference surface is indented from the edge surface by an initial distance, and the reference surface is offset from the edge surface by a portion of side edge of the first plate; and
trimming the edge surface of the extrusion head by removing material from the side edges of the first, second and third sheets until the reference surface is separated from the edge surface by a predetermined distance, the predetermined distance being less than the initial distance.
2 Assignments
0 Petitions
Accused Products
Abstract
A co-extrusion head for forming high-aspect ratio gridline structures in a micro extrusion apparatus includes multiple sheets (e.g., metal plates) that are machined and assembled to define three-part fluidic channels having associated outlet orifice disposed along an edge surface of the head. Reference surfaces are also etched in the sheets and are aligned in a straight line that intersects output junctions of the three-channel cavities. After assembly (e.g., using high pressure bonding techniques), each reference surface is located inside a notch defined in the edge surface. The edge surface of the co-extrusion head is then trimmed (e.g., machined by wire EDM) using the reference surfaces as a precise guide, thereby producing uniform length outlet orifices with uniform flow impedance.
-
Citations
10 Claims
-
1. A method for fabricating an extrusion head for a micro extrusion apparatus, the extrusion head having a plurality of fluidic channels for extruding material on a substrate, the method comprising:
-
forming a first sheet such that the first sheet defines at least one reference surface and an extrusion cavity including an outlet region such that the reference surface is disposed in proximity to the outlet region; securing the first sheet between second and third sheets to form said extrusion head such that the extrusion cavity and one or more of the second and third sheets form an associated fluidic channel, and such that side edges of the first, second and third sheets collectively form an edge surface of the extrusion head, wherein the side edge of the first sheet defines both an outlet orifice communicating with said outlet region of the extrusion cavity and a notch, wherein the reference surface is disposed in the notch such that the reference surface is indented from the edge surface by an initial distance, and the reference surface is offset from the edge surface by a portion of side edge of the first plate; and trimming the edge surface of the extrusion head by removing material from the side edges of the first, second and third sheets until the reference surface is separated from the edge surface by a predetermined distance, the predetermined distance being less than the initial distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification