Patent ID: 7905821

Claim:
A process for manufacturing a double-walled paperboard cup, the process including the acts of: feeding an inner sleeve, on which an upper rolled lip is applied and in which a cup bottom is inserted, to a forming station having a core mandrel, a cup take-up and a pressing ring; inserting the core mandrel into inner sleeve; forming a stopping face designed as a shoulder located at a lower portion of the inner sleeve at which a diameter of the inner sleeve is reduced discontinuously, in the forming station, by sliding the pressing ring onto the inner sleeve and the core mandrel; and opening the forming station and transporting the inner sleeve for completion of the double-walled cup to processing stations in which the inner sleeve is joined to an outer sleeve, wherein the stopping face is formed simultaneously about a circumference of the inner sleeve by the sliding of the pressing ring onto the inner sleeve and the core mandrel.