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Apparatus for folding a web of sheet material moving along a given linear path comprise three longitudinally spaced plates forming an overall slot having a base portion through which the central portion of the web passes, and short reversely curved slot portions at the ends of the base portion which

Apparatus for folding a web of sheet material moving along a given linear path comprise three longitudinally spaced plates forming an overall slot having a base portion through which the central portion of the web passes, and short reversely curved slot portions at the ends of the base portion which join outer end slot portions which fold the opposite longitudinal edge portions of the web toward each other. The outermost of the plates having large aligned apertures whose margins fall along the outer margins of the slot. The plate between the outermost plates has a tongue with margins which fall along the inner margin of the slot.

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A folding apparatus for folding a web of sheet material of a given thickness moving along a given path, said web having parallel longitudinal edges and a given fixed consistent width, said folding apparatus comprising three confronting, substantially parallel plates spaced along a given longitudinal

A folding apparatus for folding a web of sheet material of a given thickness moving along a given path, said web having parallel longitudinal edges and a given fixed consistent width, said folding apparatus comprising three confronting, substantially parallel plates spaced along a given longitudinal axis and forming an overall slot wherein the outer margin of the overall slot is defined by apertures in the outermost plates and the innermost margin of the overall slot is defined by a portion of the plate between the outermost plates, said overall slot including a base portion through which the central portion of the web can pass, and short reversely curved slot portions at the ends of the base portion which join outer end slot portions and through which outer end slot portions the longitudinal edge portions of the web can pass so as to be folded over the central portion of the web, the outermost of said plates respectively having aligned apertures whose margins fall along the outer margins of said overall slot and the plate between said outermost plates constituting an intermediate plate having a projecting tongue with a perimeter which falls along the inner margin of said overall slot. A method of folding a web of sheet material of a given thickness moving along a given path, said web having parallel longitudinal edges and a given fixed consistent width, 36 the method comprising the steps of providing folding apparatus including three confronting, substantially parallel plates spaced along a given longitudinal axis and forming an overall slot wherein the outer margin of the overall slot is defined by apertures in the outermost plates and the innermost margin of the overall slit is defined by a portion of the plate between the outermost plates, said overall slot having a base portion through which the central portion of the web can pass, and short reversely curved slot portions at the ends of the base portion which join outer end slot portions and through which outer end slot portions the longitudinal edge portions of the web can pass so as to be folded over the central portion of the web, the outermost of said plates respectively having aligned apertures whose margins fall along the outer margins of said overall slot, and the plate between said outermost plates constituting an intermediate plate having a projecting tongue with a perimeter which falls along the inner margin of said overall slot.