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1. (WO1998051470) EXTRUSION TOOL AND PROCEDURE FOR ITS MANUFACTURE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/051470 International Application No.: PCT/IB1998/000703
Publication Date: 19.11.1998 International Filing Date: 08.05.1998
Chapter 2 Demand Filed: 10.12.1998
IPC:
B29C 47/06 (2006.01) ,B29C 47/20 (2006.01) ,B29C 47/70 (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
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
12
Extrusion nozzles or dies
20
with annular opening, e.g. for tubular 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
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
58
Details
70
Flow dividers
Applicants:
B & W KUNSTSTOFFMASCHINENBAU & HANDELSGESELLSCHAFT MBH [DE/DE]; Mohriner Allee 30 D-12347 Berlin, DE (AllExceptUS)
KREBS, Stefan [DE/DE]; DE (UsOnly)
Inventors:
KREBS, Stefan; DE
Priority Data:
197 20 862.210.05.1997DE
Title (EN) EXTRUSION TOOL AND PROCEDURE FOR ITS MANUFACTURE
(FR) OUTIL D'EXTRUSION ET SON PROCEDE DE FABRICATION
Abstract:
(EN) The present invention concerns an extrusion tool (1) with an annular outlet gap or circular slot, especially sleeve tools and mandrel holding tools, and also a procedure for manufacturing an extrusion tool of such a type. The present invention distinguishes itself in that, the center mandrel (4) is surrounded annularly by a flow divider (3), which divides the melt flow into two annular partial flows. The center mandrel (4) and/or the flow divider (3) are also arranged eccentric to the center line of the annular outlet gap (13) in the region lodged directly in front of the annular outlet gap (13). Two melt flows with eccentric distribution of wall thickness result from this.
(FR) Cette invention se rapporte à un outil d'extrusion (1) ayant un espace de sortie annulaire ou une fente circulaire, notamment des outils à manchon et des outils avec porte-mandrin, ainsi qu'à un procédé de fabrication d'un outil d'extrusion de ce type. Cette invention se caractérise en ce que le mandrin central (4) est entouré selon une configuration annulaire par un diviseur de flux (3), qui divise l'écoulement de matière en fusion en deux flux partiels annulaires. Le mandrin central (4) et/ou le diviseur de flux (3) sont également disposés excentrés par rapport à l'axe de l'espace de sortie annulaire (13) dans la région logée directement en face de cet espace de sortie annulaire (13). Deux flux de matière en fusion avec distribution excentrée de l'épaisseur de la paroi résultent de cette conception.
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Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0876895AU1998070714