Nozzle For The Production Of Hollow Bodies Of Thermoplastic Material By Extrusion Blow Molding

• US 20110129560A1
• Filed: 02/09/2011
• Published: 06/02/2011
• Est. Priority Date: 06/09/2006
• Status: Abandoned Application

• Current Assignee: Kautex Textron GmbH & Company KG (Textron Inc)
• Original Assignee: Kautex Textron GmbH & Company KG (Textron Inc)
• Inventors: Eckhardt, Joachim, Borchert, Matthias, Froitzheim, Thomas, Lorenz, Harald, Wolter, Gerd, Kramer, Timo, Eulitz, Dirk
• Application Number:
  US13/023,770
• Publication Number:
  US 20110129560A1
• Time in Patent Office: Days
• US Class Current: 425/522
• CPC Class Codes: B29C 2049/2008 inside the article
• CPC Class Codes: B29C 2049/2073 Means for feeding the inserts into the mould, preform or parison, e.g. grippers
• CPC Class Codes: B29C 2791/001 Shaping in several steps
• CPC Class Codes: B29C 2791/006 Using vacuum
• CPC Class Codes: B29C 2791/007 Using fluid under pressure
• CPC Class Codes: B29C 2948/92647 Thickness
• CPC Class Codes: B29C 2948/92904 Die; Nozzle zone
• CPC Class Codes: B29C 48/0011 combined with compression moulding
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/09 Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/313 by positioning the die lips
• CPC Class Codes: B29C 49/04 Extrusion blow-moulding
• CPC Class Codes: B29C 49/0691 using sheet like material, e.g. sheet blow-moulding from joined sheets
• CPC Class Codes: B29C 49/06914 using parallel sheets as a preform
• CPC Class Codes: B29C 49/20 of articles having inserts or reinforcements ; Handling of inserts or reinforcements
• CPC Class Codes: B29C 51/00 Shaping by thermoforming , i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor blow moulding of tubular preforms B29C49/00, deforming of tubular or hollow preforms B29C67/0014
• CPC Class Codes: B29C 51/267 Two sheets being thermoformed in separate mould parts and joined together while still in the mould B29C49/0691 takes precedence
• CPC Class Codes: B29K 2995/0067 non-permeable
• CPC Class Codes: B29L 2031/7172 : Fuel tanks, jerry cans

Abstract

The invention concerns a nozzle for the production of hollow bodies of thermoplastic material by extrusion blow molding. According to the invention, continuous extrusion of at least two preforms in web form of plasticized material is effected by means of a plurality of extrusion devices. The preforms are jointly shaped to form a hollow body in the still plastic condition, that is to say, in the first heat, within a multi-part tool forming a mold cavity. In that case, a wall thickness profile is imparted to at least one preform during the extrusion operation independently of the respective other preform by continuous nozzle gap adjustment during the extrusion operation.

Claims

1. A wide-slot nozzle for imparting a thickness profile to a preform along the width and length direction of said preform comprising;

a nozzle body; and

at least two tool lips delimiting a nozzle gap;

wherein said preform further includes a wall thickness and wherein adjustment of at least one of said at least two tool lips causes said nozzle gap to be narrowed or enlarged resulting in a change in the wall thickness of said preform.

2. The wide-slot nozzle of claim 1 wherein said nozzle body is adjustable in portion-wise manner in the width direction to effect portion-wise adjustment of said nozzle gap.

3. The wide-slot nozzle of claim 1 wherein said at least one of said at least two tool lips is of a pliable nature.

4. The wide-slot nozzle of claim 1 wherein a first of said at least two tool lips is displaceable uniformly over the depth of the nozzle gap and the second of said at least two tool lips is in the form of a counterpart lip which is oppositely deformable in portion-wise manner in the width direction of said nozzle gap.