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1. (WO1998052726) METHOD AND DEVICE FOR CONTINUOUS PERFORATION OF A THERMOPLASTIC FILM BY A GRID WITH ELLIPTICAL OPENINGS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/052726 International Application No.: PCT/FR1998/000920
Publication Date: 26.11.1998 International Filing Date: 07.05.1998
Chapter 2 Demand Filed: 28.09.1998
IPC:
A61F 13/15 (2006.01) ,B26F 1/26 (2006.01) ,B29C 51/22 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
F
FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
13
Bandages or dressings; Absorbent pads
15
Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
B PERFORMING OPERATIONS; TRANSPORTING
26
HAND CUTTING TOOLS; CUTTING; SEVERING
F
PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
1
Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
26
Perforating by non-mechanical means, e.g. by fluid jet
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
51
Shaping by thermoforming, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
18
Thermoforming apparatus
20
having movable moulds or mould parts
22
rotatable about an axis
Applicants:
GUIAL [FR/FR]; 56, impasse Edison F-69400 Villefranche sur Saône, FR (AllExceptUS)
BEZIER, Bernard [FR/FR]; FR (UsOnly)
Inventors:
BEZIER, Bernard; FR
Agent:
MATKOWSKA, Franck; Cabinet Beau de Loménie 37, rue du Vieux Faubourg F-59800 Lille, FR
Priority Data:
97/0627616.05.1997FR
Title (EN) METHOD AND DEVICE FOR CONTINUOUS PERFORATION OF A THERMOPLASTIC FILM BY A GRID WITH ELLIPTICAL OPENINGS
(FR) METHODE AINSI QUE DISPOSITIF POUR LE PERCEMENT EN CONTINU D'UN FILM THERMOPLASTIQUE PAR UNE GRILLE AVEC OUVERTURES EN FORME D'ELLIPSE
Abstract:
(EN) The invention concerns a grid (3a) for continuously perforating a thermoplastic film being reeled off, using suction through the openings of a grid comprising openings (5) with an elliptical cross-section and having the same orientation. Preferably the ratio between the length (a) of the major axis and the length (b) of the minor axis of each elliptical opening ranges between 1.15 and 1.30, and more preferably between 1.18 and 1.20. The invention is useful for producing thermoplastic films with circular perforations, in particular for absorbent disposable hygienic articles.
(FR) La grille (3a) pour le percement en continu d'un film thermoplastique en défilement, par mise en oeuvre d'une aspiration à travers les ouvertures de la grille comporte des ouvertures (5) qui présentent une section en ellipse et ont la même orientation. De préférence le rapport entre la longueur (a) du grand axe et la longueur (b) du petit axe de chaque ouverture elliptique (5) est compris entre 1,15 et 1,30, et de préférence entre 1,18 et 1,20. L'invention permet de réaliser des films thermoplastiques à perforations circulaires, notamment pour articles d'hygiène jetables absorbants.
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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: French (FR)
Filing Language: French (FR)
Also published as:
AU1998076611