A method and apparatus for pleating or otherwise shaping a web are described herein. The method and apparatus may have numerous applications. In some embodiments, the method and apparatus are used in the formation, filling, and sealing of unit dose packages for consumer products. A method and apparatus for forming sealing two moving webs together, which webs have portions that are non-planar are also described herein.

A method and apparatus for pleating or otherwise shaping a web are described herein. The method and apparatus may have numerous applications. In some embodiments, the method and apparatus are used in the formation, filling, and sealing of unit dose packages for consumer products. A method and apparatus for forming sealing two moving webs together, which webs have portions that are non-planar are also described herein.

Folding or interfolding machine for forming stacks of a predetermined number of sheets comprising a first and a second folding or interfolding roll, arranged to rotate about respective rotation axes to fold or interfold the sheets according to a predetermined folding or interfolding configuration, obtaining a forming stack of folded or interfolded sheets which grows in height along a predetermined forming direction. A separation group is, furthermore, provided for separating a finished stack from a following forming stack of sheets. A transfer group is also provided for transferring the finished stack of folded or interfolded sheets towards a discharge zone. At least one between the separation group and the transfer group comprises at least a detection device for detecting the force exerted by the forming stack, or by the finished stack on the separation group, or on the transfer group.