BIAXIALLY ORIENTED THERMOPLASTIC POLYMER LAMINATE FILMS FOR LUGGAGE ARTICLES AND METHODS OF MAKING THE SAME
A laminate ( 110 ) of polypropylene films ( 100 ), a luggage shell ( 120 ) constructed of the laminate ( 110 ), a method ( 200 ) of making the laminate ( 110 ), and a method ( 280 ) of making the luggage shell ( 120 ) are provided. The films ( 100 ) include a core ( 102 ) and at least one outer layer ( 104 ). The laminate ( 110 ) includes a plurality of films ( 100 ). The laminate ( 110 ) may be formed by laminating a plurality of films 100 under predetermined pressure, temperature, and time conditions. The shell ( 120 ) may be formed by deep drawing a sheet of laminate ( 110 ) while applying heat and tension to the laminate ( 110 ).
1 . A luggage shell comprising:
a shell formed of a laminate of a plurality of coextruded films, said films being structures that include a non-woven, planar, continuous sheet element;
the films comprising:
a core of a biaxially oriented thermoplastic polymer; and
at least one outer layer of a thermoplastic polymer.
2 . The luggage shell of claim 1 , wherein the laminate comprises a centre, a first side or portion, and a second side or portion, each comprising films.
3 . The luggage shell of claim 1 , wherein the laminate further comprises one or more auxiliary materials.
4 . The luggage shell of claim 1 , wherein the auxiliary material comprises a colour, print, pattern or design.
5 . The luggage shell of claim 1 , wherein the auxiliary material comprises a solid film, for example a cast polypropylene film.
6 . The luggage shell of claim 1 , wherein the auxiliary material comprises a core and at least one outer layer.
7 . The luggage shell of claim 3 , wherein the auxiliary material is arranged: within the plurality of films of the centre, first side, or second side; or between the centre and first side; or between the centre and second side; or on an outer surface of the first side or an exterior of the second side as the outermost layer of the laminate film.
8 . The luggage shell of claim 3 , wherein the auxiliary material comprises thermoplastic olefin films, printed films, coloured polypropylene and/or polyethylene films, white or coloured BOPP films, metallized BOPP films, short or chopped polypropylene fibres, short or chopped bicomponent (BICO) fibres, knitted fabrics, woven fabrics, nonwoven fabrics, polypropylene and/or polyethylene powder, and/or combinations thereof.
9 . The luggage shell of claim 1 , wherein the outer layer has a thickness of 0.5% to 25% of the thickness of a film.
10 . The luggage shell of claim 1 , wherein the film has a thickness of 10 μm±5%-100 μm±5% and/or wherein the core has a thickness of 10 μm±5%-100 μm±5% and/or wherein the outer layer has a thickness of 0.6 μm±5% to 2.5 μm±5% or is 2% to 7% of the thickness of the film and/or wherein the laminate comprises 10 to 50 films or 22 or 23 films, and/or wherein the thickness of the laminate is 0.25 mm to 2.5 mm or 0.5 mm to less than 1 mm.
11 . The luggage shell of claim 1 , wherein from at least two adjacent films to all films of the plurality of films are oriented in the same direction.
12 . The luggage shell of claim 1 , wherein the biaxially oriented thermoplastic polymer is biaxially oriented polypropylene.
13 . The luggage shell of claim 1 , wherein the outer layer comprises a copolymer of polypropylene and polyethylene or comprises a terpolymer of polypropylene, polyethylene, and polybutene.
14 . The luggage shell of claim 1 , wherein a melting point of the core is higher than a melting point of the outer layer and/or wherein the melting point of the core is at least 10° C. higher than melting point of the outer layer.
15 . The luggage shell of claim 1 , wherein the film is stretched and is stretched to a greater extent in one of a transverse direction and a longitudinal direction than in the other of the transverse direction and the longitudinal direction.