Sheet-material associating – Associating and folding – Sheet associating
Patent
1987-01-16
1990-01-16
Green, Randall L.
Sheet-material associating
Associating and folding
Sheet associating
270 201, B42C 104
Patent
active
048938033
ABSTRACT:
A method of folding a sheet, cut from at least one advancing web of material electrostatically bonded at least on one side and preferably consisting of paper or of a composite manufactured therefrom, transferred to a collecting cylinder, picked up in the vicinity of its midline by a folding cylinder that rests against the collecting cylinder in a nip along the midline of the sheet, and drawn completely over the folding cylinder while both halves of the sheet are folded together along the midline as the rotation continues, whereby the cylinders rotate in opposite directions and the web is charged at least outside the cylinders if necessary. An electrostatic field exerts a force of attraction in the nip (which is upstream in the direction that the two cylinders rotate in) on the top of the sheet (which is pulled off in a direction opposite the one that the collecting cylinder rotates in) toward a guide and the sheet is accordingly attracted and transferred to the folding cylinder.
REFERENCES:
patent: 3323794 (1967-06-01), Brandt
patent: 3346253 (1967-10-01), Paschke
patent: 3351340 (1967-11-01), Levine
patent: 4494949 (1985-01-01), Baley
patent: 4666139 (1987-05-01), Filewich
Eltex-Elektrostatik Gesellschaft mbH
Fogiel Max
Green Randall L.
Newholm Therese M.
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