EP 1539466 A1 20050615 - METHOD FOR THE PRODUCTION OF SELF-CLEANING FILMS IN A BLOW MOLDING METHOD
Title (en)
METHOD FOR THE PRODUCTION OF SELF-CLEANING FILMS IN A BLOW MOLDING METHOD
Title (de)
VERFAHREN ZUR HERSTELLUNG SELBSTREINIGENDER FOLIEN IM BLASVERFAHREN
Title (fr)
PROCEDE DE PRODUCTION DE FEUILLES AUTONETTOYANTES AU MOYEN D'UN PROCEDE DE SOUFFLAGE
Publication
Application
Priority
- DE 10242174 A 20020910
- EP 0309283 W 20030821
Abstract (en)
[origin: WO2004024427A1] The invention relates to a method for the production of blown film tubes (3) that are fitted with at least one self-cleaning surface. The method according to the invention has the following characteristics: forming a plastic molten mass in an extruder (2); pressing the plastic molten mass in a blowing head that has an annular discharge slit; extruding a film tube (3) from said annular slit; expanding the radius (R1) of the film tube (3) by producing a corresponding pressure at around the blow-up factor (FR) in the interior of the film tube (3); squeezing the film tube (3) with nip rolls (4); stretching the film tube (3) at around the longitudinal stretching factor (FZ) in its axial direction (z). The novelty of the invention is that at least one surface of the film tube (3) is fitted with bumps due to the fact that the material required to form matter volumes is either added before extruding the plastic molten mass from the annular slit or is distributed on the at least one surface of the film tube (3) after extrusion.
IPC 1-7
IPC 8 full level
B29C 47/00 (2006.01); B29C 48/10 (2019.01); B29C 70/64 (2006.01)
CPC (source: EP US)
B29C 48/10 (2019.01 - EP US); B29C 70/64 (2013.01 - EP US); B29C 48/0018 (2019.01 - EP US)
Citation (search report)
See references of WO 2004024427A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004024427 A1 20040325; AU 2003260443 A1 20040430; DE 10242174 A1 20040318; DE 10242174 B4 20050127; EP 1539466 A1 20050615; US 2005263940 A1 20051201
DOCDB simple family (application)
EP 0309283 W 20030821; AU 2003260443 A 20030821; DE 10242174 A 20020910; EP 03794914 A 20030821; US 52450205 A 20050214