a helical section not shown in processing zone n in chamber 34 and exit at an off load zone u guide rollers 38 route belt 32 back to loading zone l system 30 may also comprise an infeed belt separate from a collapsible belt like system 10 above in the example of fig4 there are 82 paths of products p deposited by loader 36 located above a straight infeed belt section 32a in loading zone l the products are automatically deposited in paths 1 to 82 at incrementally discrete spacings path 82 having the least spacing however where belt 32 collapses in processing zone n the linear spacing between each product in the different paths is equal to the spacing in path 82 thus achieving maximum loading capacity of the belt in the processing zone n referring to fig5 loader 36 comprises a plurality of outlets 40 positioned across the width of belt section 32a for discharging products p along paths 1 82 of course it is understood that other forms of loaders may be used without departing from the spirit and scope of the invention a controller 42 regulates the dispensing or production rate q n for each path in response to inputs of the belt length l load density d processing time t and the radii r 1 r 2 r n of the paths and the outside radius r o of the belt in the helix according to.