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1. (WO1979000305) SELF-CLEANING EXTRUSION PRESS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000305 International Application No.: PCT/JP1978/000028
Publication Date: 31.05.1979 International Filing Date: 16.11.1978
IPC:
B29C 47/40 (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
08
Component parts, details or accessories; Auxiliary operations
36
Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
38
using screws
40
using at least two intermeshing screws
Applicants:
Inventors:
Priority Data:
77/13924819.11.1977JP
Title (EN) SELF-CLEANING EXTRUSION PRESS
(FR) PRESSE A EXTRUDER AUTO-NETTOYANTE
Abstract:
(EN) A self-cleaning extrusion press provided with at least two rotating screws (1; 1") extending along the same direction as a cylinder (2) and being in such a state that at any given position of the screws along the longitudinal direction of the extrusion press a profile of one screw in a cross section perpendicular to its axis is substantially in one-point contact with the profile of the other screw engaging thereto in the same cross section. Each of the screws (1; 1") is provided with at least two screw flights (3, 5; 3", 5"), a top portion (4; 4") of at least one screw flight is substantially in contact with the inside surface of the cylinder (2) and the top portion (6; 6") of at least the other one screw flight is in a certain tip clearance ((Alpha)) to the inside surface of the cylinder.
(FR) Une presse a extruder auto-nettoyante possede au moins deux vis rotatives (1; 1") se prolongeant dans la meme direction qu"un cylindre (2) et placees de sorte que dans toutes les positions des vis dans le sens longitudinal de la presse a extruder, un contour d"une vis dans une section perpendiculaire a son axe est en contact en un point avec le contour de l"autre vis s"y engageant, dans la meme section. Chacune des s (1; 1") possede au moins deux portees de filets (3, 5; 3", 5"), une partie superieure (4; 4") d"au moins ne portee de filet etant en contact avec la surface interne du cylindre (2) et 17 partie superieure (6; 6") de l"autre portee de filet au moins s"ecartant de la surface interne du cylindre pour menager un espace libre ((Alpha)).
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
SU01190979