Process of making a glossy film
An impact resistant provided PMMA moulding material according to DE 195 44 563 is process into a surface-hardened film which is highly glossy, essentially free of gel bodies and can be processed in the “in-mould-film-decoration” method. The melted mass is generated by means of an extruder and fed to the inventive glazing rolls via a flexible lip nozzle, said rolls being configured in order to generate an especially high locking pressure in the roll slit. The smoothing rolls are cambered. The films are used for decorating surfaces of high-value thermoplastic moulded parts.
1. A film obtained by a method, comprising:
melting a thermoplastic molding material, thereby obtaining a melt;
feeding the melt to a roll gap between two glazing rolls;
generating a locking force in said roll gap;
shaping said melt in said roll gap to obtain a shaped melt;
smoothening and cooling said shaped melt,
thereby obtaining said film which is glossy on both sides and which has a thickness in the range of 80 to 300 μm;
wherein a surface haze of said film is <1.5%.
2. A method, comprising:
decorating an extruded shaped part with the film according to claim 1 .
3. A method, comprising:
decorating an extruded, mechanically formed shaped parts with the film according to claim 1 .
4. An injection-molded shaped part, comprising:
a film obtained by a method, comprising:
melting a thermoplastic molding material, thereby obtaining a melt;
feeding the melt to a roll gap between two glazing rolls;
generating a locking force in said roll gap;
shaping said melt in said roll gap to obtain a shaped melt;
smoothening and cooling said shaped melt,
thereby obtaining said film which is glossy on both sides and which has a thickness in the range of 80 to 300 μm; and
a substrate
wherein a surface haze of said film is <1.5%.
5. The injection-molded shaped part according claim 4 , wherein said substrate is a thermoplastic laminate.
6. The injection-molded shaped part according to claim 4 , wherein said film has a surface hardness of at least pencil hardness HB.
7. The injection-molded shaped part according to claim 4 , wherein a surface gloss of said glossy side is ≧120.
8. The injection-molded shaped part according to claim 4 , wherein a gel-body count of said film is not more than 1 gel body per 200 cm 2 .
9. The injection-molded shaped part according to claim 4 , wherein a UV-absorption of said film between 200 and 370 nm is <1%.
10. The injection-molded shaped part according to claim 4 , wherein one of said two glazing rolls used during said feeding of said melt is fixed immovably in a glazing roll stand.
11. The injection-molded shaped part according to claim 4 , wherein one of said two glazing rolls used during said feeding of said melt is movably positioned on roll bearings by two parallel mounted drives with worm gears, connected with thrust rods.
12. An article, comprising:
an injection-molded thermoplastic molding compound which is decorated with a film obtained by a method, comprising:
melting a thermoplastic molding material, thereby obtaining a melt;
feeding the melt to a roll gap between two glazing rolls;
generating a locking force in said roll gap;
shaping said melt in said roll gap to obtain a shaped melt;
smoothening and cooling said shaped melt,
thereby obtaining said film which is glossy on both sides and which has a thickness in the range of 80 to 300 μm;
wherein a surface haze of said film is <1.5%.
13. The article according to claim 12 , wherein the thermoplastic molding compound is a transparent molding compound.
14. An injection-molded shaped part, comprising:
a film obtained by a method, comprising:
melting a thermoplastic molding material, thereby obtaining a melt;
feeding the melt to a roll gap between two glazing rolls;
generating a locking force in said roll gap;
shaping said melt in said roll gap to obtain a shaped melt;
smoothening and cooling said shaped melt,
thereby obtaining said film which is glossy on both sides and which has a thickness in the range of 80 to 300 μm; and
a substrate
wherein a surface haze of said film is <1.5%, and
wherein a surface gloss of said glossy side is ≧120.