Packaging tray with a profiled sealing edge

A packaging tray comprising:

• a base (10), sidewalls (11, 12) and a sealing edge (13) which is formed peripherally on an upper side of the sidewalls (11, 12);
• the tray produced from a thermoformed single-layer plastic sheet formed of polyethylene terephthalate having a thickness of 300 to 800 μm;
• the sealing edge comprising a width, wherein the sealing edge (13) is formed with a profiling in the form of parallel projections which extend around the width of the sealing edge (13), each projection having an apex, wherein the apexes of the projections form a contact surface:
• a single-layer sealing film (2) formed of polyethylene terephthalate having a thickness of 20 to 80 μm placed on the sealing edge, welded by heat and pressure to the contact surface of the projections,
• wherein 10 to 30 depressions (134) are formed between adjacent projections (133) and form interruptions in the welding of sealing film (2) to the sealing edge (13) in a width direction of the tray,
• wherein the depressions, as viewed in cross section, have a depth of 0.1 to 0.4 mm and a width of 0.25 to 0.5 mm defining a receiving volume between the sealing edge (13) and the sealing film and
• wherein the depressions (134) are in the form of parallel grooves which run around the width of the sealing edge (13).