US 11,745,933 B2
Double-walled cup
Werner Stahlecker, Goeppingen (DE); Uwe Messerschmid, Albershausen (DE); and Holger Aubele, Boehmenkirch (DE)
Assigned to PTM PACKAGING TOOLS MACHINERY PTE. LTD., Singapore (SG)
Filed by Werner Stahlecker, Goeppingen (DE); Uwe Messerschmid, Albershausen (DE); and Holger Aubele, Boehmenkirch (DE)
Filed on May 22, 2017, as Appl. No. 15/601,380.
Application 15/601,380 is a continuation of application No. 12/380,423, filed on Feb. 27, 2009, granted, now 9,718,601.
Claims priority of application No. 102008014878.4 (DE), filed on Mar. 12, 2008.
Prior Publication US 2017/0253417 A1, Sep. 7, 2017
Int. Cl. B31B 110/10 (2017.01); B65D 81/38 (2006.01); B31B 105/00 (2017.01); B31B 120/50 (2017.01)
CPC B65D 81/3869 (2013.01) [B31B 2105/00 (2017.08); B31B 2105/0022 (2017.08); B31B 2110/10 (2017.08); B31B 2120/501 (2017.08)] 29 Claims
OG exemplary drawing
 
1. A process for manufacturing a double-walled cup, said process comprising the steps of:
providing a prefabricated inner cup having a substantially centrally-located longitudinal axis, the cup having an inner sleeve and a bottom;
providing a flat blank made of paper and having spaced-apart ends;
applying a thermoplastic adhesive to a limited area of the blank;
joining the ends of the blank to one another via the thermoplastic adhesive to form a tube-shaped outer sleeve;
sliding the outer sleeve onto the inner cup in a direction substantially parallel with the axis; and
attaching the outer sleeve to the inner cup, with a lower rim area of the outer sleeve not being connected to the inner sleeve, but abutting and loosely resting on the inner sleeve;
wherein said step of sliding the outer sleeve onto the inner cup occurs after said step of joining; and
wherein the outer sleeve rests on the inner sleeve only at upper and lower rim areas of the outer sleeve and so that an air gap is formed between the outer sleeve and the inner sleeve.