Granted Patent B2

US 9,969,116 · App. 14/475,266 · Granted May 15, 2018

Abstract

Claims (20)

1. A method of producing a multilayer vessel, the method comprising the steps of

extruding an inner parison, an outer parison, and a core parison,

aligning the inner parison, the core parison, and the outer parison to cause the core parison to be located between the inner parison and the outer parison to cause the core parison to surround the inner parison and to be surrounded by the outer parison to form a multilayer tube,

placing the multilayer tube in a mold cavity formed in a mold, and

expanding the multilayer tube to cause the outer parison to engage an inner surface of the mold and cause the multilayer tube to deform to create a multilayer vessel having an interior region, wherein the expanding step includes inserting a blow needle into a tube space formed in the multi-layer tube and pumping pressurized gas into the tube space to compress the core parison against the inner surface until the multilayer vessel is established,

wherein the core parison comprises an insulative cellular non-aromatic polymeric material.

2. The method of claim 1 , further comprising the step of applying a vacuum in a range of about 5 millimeters Hg to about 25 millimeters Hg to the mold cavity during the expanding step whereby the outer parison engages with the inner surface of the mold.

3. The method of claim 2 , wherein the vacuum is in a range of about 20 millimeters Hg to the mold cavity during the expanding step.

4. The method of claim 1 , wherein the pressurized gas has a pressure in a range of about 10 pounds per square inch to about 130 pounds per square inch.

5. The method of claim 4 , wherein the pressurized gas has a pressure in a range of about 30 pounds per square inch to about 50 pounds per square inch.

6. The method of claim 5 , wherein the pressurized gas has a pressure of about 40 pounds per square inch.

7. The method of claim 1 , wherein the pressurized gas has a temperature up to about 200 degrees Fahrenheit.

8. The method of claim 7 , wherein the pressurized gas has a temperature in a range of about 35 degrees Fahrenheit to about 75 degrees Fahrenheit.

9. The method of claim 8 , wherein the pressurized gas has a temperature of about 50 degrees Fahrenheit.

10. The method of claim 9 , wherein the blow-up ratio in a range of about 100% to about 300%.

11. The method of claim 10 , wherein the blow-up ratio in a range of about 150% to about 200%.

12. The method of claim 1 , wherein the multi-layer container has an average collapse force of in a range of about 50 pounds-Force to about 400 pounds-Force.

13. The method of claim 12 , wherein the average collapse force is in a range of about 100 pounds-Force to about 250 pounds-Force.

14. The method of claim 13 , wherein the average collapse force is in a range of about 115 pounds-Force to about 170 pounds-Force.

15. The method of claim 1 , wherein the core parison is formed by extruding a core-layer formulation of polymeric material.

Assignments (32)