Patent ID: 7513357

Claim:
A work module for connection to a main conveyor line in a system of conveyor lines, said work module comprising: a first transverse conveyor line; a longitudinal conveyor line; a second transverse conveyor line; each of said conveyor lines comprising an outer conveyor line and an inner conveyor line; an upper surface, said upper surface having an area which is limited by said outer conveyor lines of said first transverse, second transverse and the longitudinal conveyor lines; a dissipatively conducting material comprising a plastic mat essentially covering said upper surface within said area except at positions within said area where said first transverse, second transverse and longitudinal conveyor lines run; and an underlying electrically conductive structure supporting each of said conveyor lines, said first transverse conveyor line being arranged to transport goods delivered from said main conveyor line to the longitudinal conveyor line, said second transverse conveyor line being arranged to transport goods delivered from said longitudinal conveyor line to said main conveyor line, in each of said first transverse, longitudinal and second transverse conveyor lines are equipped with a dissipatively conducting protection layer between said each conveyor line and said underlying electrically conductive structure, and said dissipatively conducting protection layer has a surface resistivity in the range between 10 4 Ω/sq and 10 10 Ω/sq.