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1. WO2003006227 - PROCEDE D'EXPULSION PAR MOULAGE PAR INJECTION A GAZ

Numéro de publication WO/2003/006227
Date de publication 23.01.2003
N° de la demande internationale PCT/IB2001/001592
Date du dépôt international 10.07.2001
CIB
B29C 45/17 2006.01
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
17Eléments constitutifs, détails ou accessoires; Opérations auxiliaires
CPC
B29C 2045/1712
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
17Component parts, details or accessories; Auxiliary operations
1703Introducing an auxiliary fluid into the mould
1704the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
1711and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
1712plastic material flowing back into the injection unit
B29C 2045/1713
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
17Component parts, details or accessories; Auxiliary operations
1703Introducing an auxiliary fluid into the mould
1704the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
1711and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
1713using several overflow cavities
B29C 45/1711
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
17Component parts, details or accessories; Auxiliary operations
1703Introducing an auxiliary fluid into the mould
1704the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
1711and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
Déposants
  • GAS INJECTION, LTD. [GB/GB]; 33 Hospital Street Nantwich Cheshire CW5 5RL, GB
Inventeurs
  • PEARSON, Terence, C.; GB
Mandataires
  • BAYLISS, Geoffrey, Cyril; Boult Wade Tennant Verulam Gardens 70 Gray's Inn Road London WC1X 8BT, GB
Données relatives à la priorité
Langue de publication anglais (EN)
Langue de dépôt anglais (EN)
États désignés
Titre
(EN) EXPULSION PROCESS BY GAS INJECTION MOULDING
(FR) PROCEDE D'EXPULSION PAR MOULAGE PAR INJECTION A GAZ
Abrégé
(EN)
A system and process for gas assisted plastic injection molding. The plastic material is injected into the mold cavity and the molding pressure is held for a period of time. Thereafter, gas is injected into the plastic material and the pressure is again held for a period of time. Thereafter, valve members are opened allowing plastic to be expelled into one or more secondary cavities, or to be expelled back into the machine barrel.
(FR)
L'invention concerne un système et un procédé de moulage par injection plastique à gaz, à cet effet, une matière plastique est injectée dans l'empreinte du moule et la pression de moulage est maintenue pendant une certaine période de temps. Par la suite, le gaz est injecté dans la matière plastique et la pression est à nouveau maintenue pendant une certaine période de temps. Finalement, des éléments de soupape sont ouverts et permettent d'expulser le plastique vers une ou plusieurs empreintes secondaires ou d'expulser le plastique vers le cylindre de plastification de la machine.
Également publié en tant que
Dernières données bibliographiques dont dispose le Bureau international