METHOD AND APPARATUS FOR FORMING A PARISON

• US 20080157443A1
• Filed: 12/21/2007
• Published: 07/03/2008
• Est. Priority Date: 01/03/2007
• Status: Active Grant

• Current Assignee: Mark R. Hock
• Original Assignee: Mark R. Hock
• Inventors: Hock, Mark R.
• Granted Patent: US 7,713,051 B2
• Time in Patent Office: Days
• US Class Current: 264/512
• CPC Class Codes: B29C 48/09 Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• CPC Class Codes: B29C 48/10 flexible, e.g. blown foils
• CPC Class Codes: B29C 48/18 the components being layers
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/335 Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
• CPC Class Codes: B29C 48/3366 using a die with concentric parts, e.g. rings, cylinders
• CPC Class Codes: B29C 48/34 Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
• CPC Class Codes: B29C 48/495 Feed-blocks extrusion moulding of multi-component articles B29C48/16
• CPC Class Codes: B29C 49/04 Extrusion blow-moulding
• CPC Class Codes: B29C 49/041 using an accumulator head
• CPC Class Codes: B29K 2023/06 PE, i.e. polyethylene
• CPC Class Codes: B29K 2023/0633 LDPE, i.e. low density polyethylene
• CPC Class Codes: B29K 2023/065 HDPE, i.e. high density polyethylene
• CPC Class Codes: B29K 2023/086 EVOH, i.e. ethylene vinyl alcohol copolymer
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2995/0067 non-permeable
• CPC Class Codes: B29K 2995/0069 non-permeable
• CPC Class Codes: B29L 2031/7158 Bottles

Abstract

A method and apparatus for forming a parison is described. The apparatus has a mandrel housing. The housing has an axially aligned hollow mandrel channel therein and a side channel substantially transverse to the mandrel channel. A mandrel is also provided. The mandrel has an axially oriented notch in an exterior surface. The notch is in fluid communication with two fluid channels that extend continuously downwardly around the mandrel to meet one another on an opposite side of the mandrel from the notch. When the mandrel is installed within the mandrel channel, a first radial gap and a second radial gap, both between the mandrel and the mandrel housing, are formed.

Claims

1. An assembly for forming a parison, comprising:

a mandrel housing having an axially aligned hollow mandrel channel therein and a side channel substantially transverse to said mandrel channel; and

a mandrel having an axially oriented notch in an exterior surface, said notch in fluid communication with two fluid channels that extend continuously downwardly around said mandrel to meet one another on an opposite side of the mandrel from said notch, wherein each of said fluid channels has at least one flow restrictor forming a sloped transition from said fluid channels to said exterior surface of said mandrel;

wherein when said mandrel is installed within said mandrel channel, a first radial gap and a second radial gap, both between the mandrel and the mandrel housing, are formed, wherein said first radial gap is less than said second radial gap, said first radial gap being on the side of the notch and said second gap being opposite said notch.