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1. DE000019617349 - Injection moulding of multilayered tubing

Office Allemagne
Numéro de la demande 19617349
Date de la demande 30.04.1996
Numéro de publication 000019617349
Date de publication 04.09.1997
Type de publication C1
CIB
B29C 45/16
BTECHNIQUES INDUSTRIELLES; TRANSPORTS
29TRAVAIL DES MATIÈRES PLASTIQUES; TRAVAIL DES SUBSTANCES À L'ÉTAT PLASTIQUE EN GÉNÉRAL
CFAÇONNAGE OU ASSEMBLAGE DES MATIÈRES PLASTIQUES; FAÇONNAGE DES MATIÈRES À L'ÉTAT PLASTIQUE NON PRÉVU AILLEURS; POST-TRAITEMENT DES PRODUITS FAÇONNÉS, p.ex. RÉPARATION
45Moulage par injection, c. à d. en forçant un volume déterminé de matière à mouler par une buse d'injection dans un moule fermé; Appareils à cet effet
16Fabrication d'objets multicouches ou polychromes
B29D 23/2
CPC
B29C 45/00
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
45Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
B29C 45/1603
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
45Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
16Making multilayered or multicoloured articles
1603Multi-way nozzles specially adapted therefor
B29C 45/1607
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
45Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
16Making multilayered or multicoloured articles
1603Multi-way nozzles specially adapted therefor
1607having at least three different ways
B29C 45/1642
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
45Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
16Making multilayered or multicoloured articles
1642having a "sandwich" structure
B29C 45/1643
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
45Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
16Making multilayered or multicoloured articles
1642having a "sandwich" structure
1643from at least three different materials or with at least four layers
B29K 2023/06
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2023Use of polyalkenes ; or derivatives thereof; as moulding material
04Polymers of ethylene
06PE, i.e. polyethylene
Déposants KUEHN HANS
Inventeurs KUEHN HANS
Titre
(DE) Spritzgießverfahren zur Herstellung von mehrschichtigen Kunststofftuben
(EN) Injection moulding of multilayered tubing
Abrégé
(DE)
Die Erfindung betrifft ein Kunststoffspritzgießverfahren zur Herstellung von Behältern zum Aufbewahren von Fluiden sowie auf eine Spritzgießvorrichtung zum gleichzeitigen Mehrschichtspritzen von thermoplastischen Werkstoffen sowie auf Behälter zum Aufbewahren von Fluiden, wobei die Behälter einstückig herstellbar sind. Das Verfahren erlaubt es, Behälter für Fluide aller Art so herzustellen, daß selbst schwierige Konturen wie Gewinde oder Schulterbereich, die bisher nur getrennt hergestellt werden konnten, in einem zusammenhängenden Stück mehrschichtig durch Spritzgießen herzustellen.

(EN)

For the injection moulding of multilayer plastics tubing, for ,medical or pharmaceutical fluid storage and the like, at least two hoppers (23a,23b) are charged with different thermoplastic materials, to be plasticised (21) separately. They are each pressed into a ring jet (10) with at least two concentric ring outlets, for the materials to emerge at the same speed to maintain their homogenous structure on leaving the ring gaps, and also in the interior of the mould where the tube preform is shaped. The moulded preform is cold drawn into its final structure. The material to pass through the outer and inner ring gaps is polyethylene, polyethylene glycol terephthalate or polyalkylene terephthalate or polypropylene. Between the outer and inner layers, there is at least one layer of polyamide and/or polyethylene and/or polypropylene and/or polyalkylene terephthalate and/or PEN and/or PVDC and/or polyethylene glycol terephthalate.