Method and apparatus for creasing planar material
AssigneeHunter Douglas Inc.
InventorEugene M. Ballard
Life of this patent
Estimating the term…
Abstract
A method and apparatus for creasing planar material includes a pair of confronting drums between which the material is passed with at least one of the drums having at least one electrical filament thereon adapted to engage the planar material as it is passed between the drums for melting the planar material to a predetermined depth. The filaments are preferably quick heating and also dissipate heat quickly so that they can be activated and deactivated in short intervals so that the drums upon which the heat filaments are mounted do not heat up between the filaments.
Claims10
An apparatus for creasing a planar material of a predetermined thickness comprising in combination:
- a means for creasing a planar material without completely penetrating through the predetermined thickness of the planar material, and
- a means for connecting the means for creasing without completely penetrating through the predetermined thickness of the planar material to a source of electricity.
A method of creasing without completely penetrating a planar material comprising the steps of:
- providing a pair of confronting cylindrical drums having parallel axes of rotation with said drums defining a passage therebetween for said planar material to pass, wherein at least one of said drums has at least one electrically conductive filament on its cylindrical surface,
- passing said planar material through said passage while said drums are counter-rotating so as to engage said at least one filament with said planar material,
- providing an electrical current to said at least one filament, and
- cauterizing without completely penetrating said material with said electrified filament to form a crease therein.
Dependencies are inferred from the claim text.