Method for producing a preform as well as preform for blow moulding a container

• Main Authors: SCHOEPF, KARL, DIENER, NORBERT
• Format: Patent
• Language: English; French; German
• Published: 30.12.1998
• Edition: 6
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

In einem Formhohlraum (3) wird eine vorbestimmte Menge eines ersten Materials (9) eingespritzt und zur Bildung eines Kerns (10) im gespritzten ersten Material (9) eine vorbestimmte Menge eines Rezyklats (10) in diesen Formhohlraum eingespritzt. In einer Hauptphase wird das Rezyklat (10) durch Paralleleinspritzen zusammen mit einem Teil des ersten Materials (9) in den Formhohlraum (3) eingespritzt. Vorzugweise wird beim Parallelspritzen im Bereich der Einspritzöffnung (8) des Formhohlraums (3) das Rezyklat (10) aussen und das erste Material (9) eingespritzt. Here is a new method producing a bottle preform (11) in an injection mould. A set quantity of first plastic is injected into the mould cavity. Then a set quantity of recycled material is injected, to form an annular core within the first material. The new aspect of the method is parallel injection of recycled material together with a fraction of first material. Also claimed is the preform for blowing a container, e.g. a bottle. It includes the container neck region (13), a body section (16) and a base (17), together with the annular core of recycled plastic and internal and external layers of another plastic. A novel feature is the thickness of the innermost layer, which is a multiple of the outer layer thickness.