Multistage process for producing hollow plastic articles from half shells

A process for producing hollow plastic articles, comprising the following steps:

• a). producing a tubular plastic parison by means of extrusion or coextrusion;
• b). cutting open the tubular plastic parison with a cutting device to produce two planar-surface parts using pneumatically driven rollers arranged in the immediate vicinity of the cutting device for distancing the two planar-surface parts from the cutting device immediately after separation of the parison;
• c). controlling the distance between the two planar-surface parts with guide rollers;
• d). molding the planar-surface parts in two mold halves to give half shells, where a removable intermediate frame separates the mold halves from one another at least along peripheral edges, wherein the planar-surface parts and half shells are not in contact with one another;
• e). opening the mold halves and removing the intermediate frame;
• f). closing the mold halves, wherein the half shells come into contact with one another along a peripheral rim;
• and
• g). bonding the half shells wherein the driven rollers are integrated within the cutting device.