Abstract: An arrangement is described for registering stretchable lids with mating product-filled troughs of a heat-sealed product container prior to the heat-sealing operation. The troughs are preformed at first intervals on a first strip, which is successively indexed through the first interval into the heat-sealing station. The lids are defined between regularly spaced detectable markings on a second strip, which is moved into the heat-sealing station simultaneously with the first strip. The markings on the second strip are normally spaced by a second interval slightly smaller than the first interval. At the end of each indexing movement, a marking on the second strip comes into alignment with a photocell to generate a signal.

Abstract: An improved apparatus for producing optionally empty or filled containers wherein the support structure comprises a closed housing having a cubic end section and an elongated L-shaped section in flush relationship therewith. Various elements for producing the containers are disposed in C-shaped housings mounted for displacement along rails on the L-shaped section.