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(12) Patent: | (11) CA 2204548 |
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(54) English Title: | HEATED DIE LIPS SYSTEM |
(54) French Title: | SYSTEME A LEVRES DE FILIERES CHAUFFEES |
Status: | Expired |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | |
(74) Associate agent: | |
(45) Issued: | 2001-06-05 |
(22) Filed Date: | 1997-05-06 |
(41) Open to Public Inspection: | 1998-11-06 |
Examination requested: | 1997-05-28 |
Availability of licence: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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This invention of Heated Die Lips System is specifically designed for use in Film Extrusion Dies. Use of such a system allows Film Extruders to be run at higher production rates with narrower die gaps, while eliminating the melt fracture properties. This Heated Die Lips System, is installed in the final die land area of the extrusion die, on each side of the die gap. It applies direct heat to the polymer melt as it exits the die lips, and reduces the melt viscosity. Thus the 'Critical shear stress' value of the melt is reduced. This results in postponement of the melt fracture property of the film and higher production rates are achieved without melt fracture. Furthermore, this system has been designed so as to insulate it from the main block of the die, minimizing heat dissipation and providing an enclosed system for uniform heating of the die lips.
Cette invention portant sur un système à lèvres de filières chauffées est conçue spécialement pour être utilisée dans des filières d'extrusion de film. L'utilisation de ce type de système permet de faire fonctionner des extrudeuses de film à des vitesses de production plus élevées avec des écartements de filières plus petits, tout en éliminant les propriétés de rupture de la masse fondue. Ce système à lèvres de filières chauffées est installé dans la zone de filière finale de la filière d'extrusion, sur chaque côté de l'écartement de filière. Il applique une chaleur directe à la masse fondue de polymère lorsqu'il quitte les lèvres de filières, et réduit la viscosité de la masse fondue. La valeur de « contrainte de cisaillement critique » est ainsi réduite. Cela se traduit par le report de la propriété de rupture de masse fondue du film et les vitesses de production augmentent sans rompre la masse fondue. De plus, ce système a été conçu de façon à l'isoler du bloc principal de la filière, limitant ainsi la dissipation de la chaleur et offrant ainsi un système fermé pour le chauffage homogène des lèvres de filières.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee and Payment History should be consulted.
Title | Date |
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Forecasted Issue Date | 2001-06-05 |
(22) Filed | 1997-05-06 |
Examination Requested | 1997-05-28 |
(41) Open to Public Inspection | 1998-11-06 |
(45) Issued | 2001-06-05 |
Expired | 2017-05-10 |
There is no abandonment history.
Fee Type | Anniversary Year | Due Date | Amount Paid | Paid Date |
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Application Fee | $150.00 | 1997-05-06 | ||
Request for Examination | $200.00 | 1997-05-28 | ||
Maintenance Fee - Application - New Act | 2 | 1999-05-06 | $50.00 | 1999-04-07 |
Maintenance Fee - Application - New Act | 3 | 2000-05-08 | $50.00 | 2000-03-22 |
Final Fee | $150.00 | 2001-03-08 | ||
Maintenance Fee - Application - New Act | 4 | 2001-05-07 | $50.00 | 2001-03-08 |
Maintenance Fee - Patent - New Act | 5 | 2002-05-06 | $75.00 | 2002-04-19 |
Maintenance Fee - Patent - New Act | 6 | 2003-05-06 | $75.00 | 2003-04-25 |
Maintenance Fee - Patent - New Act | 7 | 2004-05-06 | $100.00 | 2004-04-16 |
Maintenance Fee - Patent - New Act | 8 | 2005-05-06 | $100.00 | 2005-04-20 |
Maintenance Fee - Patent - New Act | 9 | 2006-05-08 | $100.00 | 2006-02-03 |
Maintenance Fee - Patent - New Act | 10 | 2007-05-07 | $125.00 | 2007-04-27 |
Maintenance Fee - Patent - New Act | 11 | 2008-05-06 | $125.00 | 2008-04-30 |
Maintenance Fee - Patent - New Act | 12 | 2009-05-06 | $125.00 | 2009-04-23 |
Maintenance Fee - Patent - New Act | 13 | 2010-05-06 | $125.00 | 2010-04-20 |
Maintenance Fee - Patent - New Act | 14 | 2011-05-06 | $125.00 | 2011-04-26 |
Maintenance Fee - Patent - New Act | 15 | 2012-05-07 | $225.00 | 2012-04-23 |
Maintenance Fee - Patent - New Act | 16 | 2013-05-06 | $225.00 | 2013-03-20 |
Maintenance Fee - Patent - New Act | 17 | 2014-05-06 | $225.00 | 2014-03-19 |
Maintenance Fee - Patent - New Act | 18 | 2015-05-06 | $225.00 | 2015-04-14 |
Maintenance Fee - Patent - New Act | 19 | 2016-05-06 | $225.00 | 2016-05-02 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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BENTIVOGLIO, ALFREDO |
Past Owners on Record |
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None |