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1. (WO1998051467) A PROCESS FOR THE PRODUCTION OF EXPANDED POLYESTER, IN PARTICULAR PET
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/051467 International Application No.: PCT/EP1998/002648
Publication Date: 19.11.1998 International Filing Date: 05.05.1998
Chapter 2 Demand Filed: 07.12.1998
IPC:
B29C 44/52 (2006.01) ,B29C 47/14 (2006.01) ,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
44
Shaping by internal pressure generated in the material, e.g. swelling, foaming
34
Component parts, details or accessories; Auxiliary operations
36
Feeding the material to be shaped
46
into an open space or onto moving surfaces, i.e. to make articles of indefinite length
50
using pressure difference, e.g. by extrusion, by spraying
52
between moving surfaces
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
14
with broad opening, e.g. for sheets
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:
B.C. FOAM S.R.L. [IT/IT]; Via Torino, 103 I-10088 Volpiano, IT (AllExceptUS)
CRANA, Renato [IT/IT]; IT (UsOnly)
Inventors:
CRANA, Renato; IT
Agent:
GERBINO, Angelo ; Jacobacci & Perani S.p.A. Corso Regio Parco, 27 I-10152 Torino, IT
Priority Data:
TO97A00039409.05.1997IT
Title (EN) A PROCESS FOR THE PRODUCTION OF EXPANDED POLYESTER, IN PARTICULAR PET
(FR) PROCEDE DE PRODUCTION DE POLYESTER EXPANSE, NOTAMMENT DE PET
Abstract:
(EN) The process for the production of expanded polyester, in particular PET, is performed by extrusion of polyester starting material having an intrinsic viscosity of at least 0.8 dl/g and an added expanded agent. To this end a twin screw extruder (14) is utilised provided with two interpenetrating screws (26) having a ratio between their axial separation and diameter lying between 0.6 and 0.8 and co-rotating at a speed of between 15 and 40 rpm. Preferably the ratio between the axial separation and diameter of the screws (26) lies between 0.69 and 0.78 and the ratio between the length and diamter of the screws (26) lies between 20 and 26.
(FR) L'invention concerne un procédé de production de polyester expansé, notamment de PET, mis en oeuvre par extrusion de matière première en polyester présentant une viscosité intrinsèque d'au moins 0,8 dl/g et un agent expansé ajouté. On utilise, pour ce faire, une extrudeuse (14) à deux vis pourvue de deux vis (26) qui s'interpénètrent, dont le rapport entre leur séparation axiale et leur diamètre est compris entre 0,6 et 0,8. Les deux vis tournent simultanément à une vitesse comprise entre 15 et 40 tours/min. Le rapport entre la séparation axiale et le diamètre des vis (26) est de préférence compris entre 0,69 et 0,78 et le rapport entre la longueur et le diamètre des vis (26) est compris entre 20 et 26.
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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:
CZPV1999-3962NO19995467TR1999/02764KR1020010012355EP1007315RU02201344
US6409948JP2002511804 CN1268919CA2289634AU1998075304