Granted Patent
B2
US 12,246,511 · App. 18/748,216 · Granted Mar 11, 2025
Biaxially oriented thermoplastic polymer laminate films for luggage articles and methods of making the same
Assignee:
Samsonite IP Holdings S.a r.l.
B32B1/00A45C5/02A45C5/03B32B5/26B32B27/08B32B27/12B32B27/32B32B37/144B32B37/206B32B38/12A45C2005/037B29C2033/385B29C2948/92152B29L2031/7418B32B2250/05B32B2250/242B32B2307/516B32B2307/518B32B2307/54B32B2307/546B32B2309/022B32B2323/10B32B2439/40Y10T428/13Y10T428/1352Y10T428/1362Y10T428/1372
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Abstract
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 ).
Claims (25)
1. A method of making a luggage shell, the method comprising:
providing a plurality of films;
laminating the plurality of films together to form a laminate; and
moulding the laminate to form a luggage shell;
wherein:
the films have a core of a biaxially oriented thermoplastic polymer and an outer layer of a thermoplastic polymer on each of the top and bottom side of the core; and
the films are laminated at a temperature of 120-190° C.; and
the laminate has a stiffness of 3.5-5 GPa in the transverse direction and a stiffness of 1.5-3 GPa in the longitudinal direction.
2. A method as claimed in claim 1 , wherein the respective core and the respective outer layer are coextruded to form each of the respective plurality of films.
3. A method as claimed in claim 1 , wherein the respective outer layer has a thickness of 0.5% to 25% of the thickness of the respective film.
4. A method as claimed in claim 1 , wherein at least two adjacent films are oriented in the same direction.
5. A method as claimed in claim 1 , wherein all the films are oriented in the same direction.
6. A method as claimed in claim 1 , wherein the cores comprise biaxially oriented polypropylene.
7. A method as claimed in claim 1 , wherein the outer layers comprise: a copolymer of polypropylene and polyethylene; or a terpolymer of polypropylene, polyethylene and polybutene.
8. A method as claimed in claim 1 , wherein the melting point of the cores is higher than a melting point of the outer layers, for example wherein the melting point of the cores is at least 10° C. higher than the melting point of the outer layers.
9. A method as claimed in claim 1 , wherein the method further comprises stretching the films, and wherein the films are 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.
10. A method as claimed in claim 1 , wherein the films have a tensile strength of 60 to 190 MPa in the longitudinal direction and a tensile strength of 150 to 300 MPa in the transverse direction.
11. A method as claimed in claim 1 , wherein the laminate includes 10 to 50 films.
12. A method as claimed in claim 1 , wherein the laminate includes at least one film constructed of a thermoplastic polymer different than the thermoplastic polymer of the core.
13. A method as claimed in claim 1 , wherein the films are laminated at a temperature of [110° C.] 120° C. to 130° C.
14. A method as claimed in claim 1 , wherein the films are polypropylene films.
15. A method as claimed in claim 1 , wherein the films are laminated at a temperature of 130° C. or less.
16. A method as claimed in claim 1 , wherein the films are laminated at a pressure of 10 bar or less.
17. A method as claimed in claim 3 , wherein said outer layer has a thickness of 2% to 7% of the thickness of said film.
18. A method as claimed in claim 11 , wherein the laminate includes 22 or 23 films.
Assignments (3)
SUPPLEMENTAL INTELLECTUAL PROPERTY SECURITY AGREEMENT
Recorded Nov 7, 2025
From: SAMSONITE IP HOLDINGS S.A R.L.
To: HSBC BANK USA
Reel/Frame 073597/0755 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Feb 5, 2025
From: KOSLOWSKI, PAULINE; HILLAERT, RIK
To: SAMSONITE EUROPE N.V.
Reel/Frame 070114/0677 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Feb 5, 2025
From: SAMSONITE EUROPE N.V.
To: SAMSONITE IP HOLDINGS S.A R.L.
Reel/Frame 070114/0754 →
Priority Claims (1)
EP 17161218
· Mar 15, 2017
· regional
Continuity (2)
Continuation
16493442
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