Perpendicular perforation on zipper tape for air evacuation of package
OwnerEric P. Plourde, John H. Schneiderinventors
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Abstract
The plastic bags are provided with a web tape with a row of apertures which are cut parallel to each other, but perpendicular to the direction of travel of the row. The apertures are not colinear with one another. The apertures are sized to allow air to pass therethrough but not to allow selected solids to pass therethrough. These apertures are cut with a rotating wheel with teeth parallel to the axis of rotation and sized to provide the apertures of the desired size.
Claims10
A method for providing vent apertures to a web component of a plastic bag, comprising the steps of:
- providing a cutting wheel which rotates about an axis, a periphery of said cutting wheel including teeth which are not perpendicular to said axis;
- providing an anvil means against which said cutting wheel bears, thereby forming a nip;
- and
- drawing the web component through said nip formed between said cutting wheel and said anvil means thereby forming apertures in the web component cut by said teeth.
A plastic bag including walls and a mouth formed between said walls, at least one of said walls including a web component with a row of apertures which are not colinear with one another, said row of apertures being mechanically cut through said at least one wall.
Dependencies are inferred from the claim text.