VARIABLE GEOMETRY FEED BLOCK FOR MULTILAYER EXTRUSION

• US 3,860,036 A
• Filed: 11/06/1972
• Issued: 01/14/1975
• Est. Priority Date: 11/02/1970
• Status: Expired due to Term

• Current Assignee: Ritchey O. Newman Jr
• Original Assignee: Ritchey O. Newman Jr
• Inventors: Newman, Ritchey O. Jr.
• Primary Examiner(s): Ruehl, Charles A.
• Application Number:
  US05/304,262
• Time in Patent Office: 799 Days
• Field of Search: 138/45,46,43 251/120 425/131,197,466
• US Class Current: 138/45
• CPC Class Codes: B29C 2948/92609 Dimensions
• CPC Class Codes: B29C 2948/92904 Die; Nozzle zone
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/307 specially adapted for bringing together components, e.g. melts within the die
• CPC Class Codes: B29C 48/92 Measuring, controlling or regulating

Abstract

A device and method is described for forming a thermoplastic material into a predetermined layer configuration. The device comprises a body which defines a passage having inlet and outlet ports on opposite sides of the body. A flexible wall portion separates the passage from a cavity within the body. An adjusting means is in operational combination with the flexible wall portion to flex said wall to vary the cross-sectional configuration of the passage.

Claims

1. A device comprising a body having generally opposite first and second sides, said body defining:

at least one passage with an inlet port in the first side, an outlet port in the second side and at least one flexible wall portion;

at least one cavity spaced apart from said passage by said flexible wall portion; and

at least one adjusting means in operational combination with and spaced apart from said flexible wall portion and said cavity, said adjusting means adapted to flex said wall portion by application of a leverage producing force to vary the crosssectional configuration of said passage.

2. The device of claim 1 including at least one adjustable elongated insert having first and second ends positioned within the body to provide said flexible wall portion, at least the first end of said insert defining a wedging surface.

3. The device of claim 2 wherein said adjusting means includes a slidable pressure transmitting means in operational combination with the wedging surface of said insert and a force exerting means in operational combination with said pressure transmitting means.

4. A feed block for multilayer extrusion of a thermoplastic resinous material comprising a metallic body having generally opposite first and second sides, said body defining at least one passage of adjustable cross-section having an inlet port in the first side, an outlet port in the second side and at least two bendable wall portions;

at least two cavities spaced apart from said passage by said bendable wall portions, said cavities adapted to permit deflection of the said bendable wall portions; and

at least two adjusting means in operational combination with and spaced apart from said bendable wall portions and said cavities, said adjusting means adapted to regulatably bend said bendable wall portions by application of a leverage producing force thereto to alter the cross-sectional configuration of said passage.

5. The feed block of claim 4 including at least one adjustable elongated insert having first and second ends positioned within the body to provide a bendable wall portion, at least the first end of said insert defining a wedging surface.

6. The feed block of claim 5 wherein said adjusting means includes a slidable pressure transmitting means in operational combination with the wedging surface of said insert and a force exerting means in operational combination with said pressure transmitting means.

7. A device comprising a body having generally opposite first and second sides, said body defining:

at least one passage with an inlet port in the first side, an outlet port in the second side and at least one flexible wall portion;

at least one cavity spaced apart from said passage by said flexible wall portion;

at least two spaced apart flanges extending generally outwardly from said body at a position generally adjacent to said passage; and

at least one adjusting means in operational combination with and spaced apart from said flexible wall portion, said adjusting means including at least one force exerting means adapted to alter the distance between said flanges, said adjusting means adapted to flex sAid wall portion by application of a leverage producing force to vary the cross-sectional configuration of said passage.

8. A feed block for multilayer extrusion of a thermoplastic resinous material comprising a metallic body having generally opposite first and second sides, said body defining at least one passage of adjustable cross-section having an inlet port in the first side, an outlet port in the second side and at least two bendable wall portions;

at least two cavities spaced apart from said passage by said bendable wall portions, said cavities adapted to permit deflection of the said bendable wall portions;

at least two spaced apart flanges extending generally outwardly from said body at a position generally adjacent to said passage; and

at least two adjusting means in operational combination with and spaced apart from said bendable wall portions, said adjusting means including at least one force exerting means adapted to alter the distance between said flanges, said adjusting means adapted to regulatably bend said bendable wall portions by application of a leverage producing force thereto to alter the cross-sectional configuration of said passage.