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1. (WO1998052739) METHOD AND APPARATUS FOR MAKING PLASTIC PIPE WITHOUT MECHANICAL PRESSURE ON INNER PIPE WALL
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/052739 International Application No.: PCT/CA1997/000332
Publication Date: 26.11.1998 International Filing Date: 20.05.1997
IPC:
B29C 47/06 (2006.01) ,B29C 49/00 (2006.01) ,B29D 23/18 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
47
Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
04
of multilayered or multicoloured articles
06
Multilayered articles
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
49
Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
D
PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
23
Producing tubular articles
18
Pleated hoses
Applicants:
LUPKE, Manfred, A., A. [CA/CA]; CA
LUPKE, Stefan, A. [CA/CA]; CA
Inventors:
LUPKE, Manfred, A., A.; CA
LUPKE, Stefan, A.; CA
Agent:
JEFFREY, John, C. ; Suite 301 133 Richmond Street West Toronto, Ontario M5H 2L7, CA
Priority Data:
Title (EN) METHOD AND APPARATUS FOR MAKING PLASTIC PIPE WITHOUT MECHANICAL PRESSURE ON INNER PIPE WALL
(FR) PROCEDE ET DISPOSITIF PERMETTANT DE FABRIQUER DES TUYAUX PLASTIQUES SANS PRESSION MECANIQUE SUR LA PAROI INTERNE DU TUYAU
Abstract:
(EN) A method of making double wall plastic pipe (8) having inner (8) and outer (5) pipe walls adhered to one another without mechanically holding the inner pipe wall against the outer pipe wall comprises extruding separate streams of molten plastic into a mold tunnel (3) to form the inner and outer pipe walls and producing a positive gas pressure which acts internally of and forces the inner pipe wall (8) outwardly against the outer pipe wall (5) while the pipe is being formed in the mold tunnel (3).
(FR) Procédé qui permet de fabriquer un tuyau plastique (8) à double paroi, comprenant une paroi interne (8) et une paroi externe (5) collées l'une à l'autre, sans presser mécaniquement la paroi interne contre la paroi externe. Selon le procédé, on extrude des flux séparés de plastique fondu dans un tunnel de moulage (3), de façon à former les parois interne et externe, puis on produit une pression de gaz positive, qui agit sur la face intérieure de la paroi interne (8) et la pousse vers l'extérieur contre la paroi externe (5), pendant que l'on forme le tuyau dans le tunnel de moulage (3).
Designated States: CA
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0927099CA2261073DE000029723138