Importance

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Abstract

A method for producing an expandable and collapsible product for use in a window covering includes the steps of pleating a continuous length of material, bonding together opposing faces that face one side of the product to form a series of enclosed cells, bonding together opposed faces facing the other side of the product to form another series of enclosed cells, and removing creases from one side of the product to open one of the series of enclosed cells so that the other series of enclosed cells remains intact and connected to one another. The creases may be removed by abrading the material along the creases. The opposed faces may be bonded by applying a bead of adhesive to one of the faces and compressing the faces together. Also provided is a window covering having a multi-cellular expandable and collapsible body. The body has a number of strips of material that are creased in the center parallel to the long edges. The long edges are joined together to form a tab. Each of the strips of material define an elongated cell bounded by the creased fold on one side and the tab on the other. Successive cells are joined together by a bond line intermediate the creased folds and the tabs. A headrail is connected to the top of the body, and a bottom rail is connected to the bottom of the body. The body is provided with a means for raising and lowering the bottom rail with respect to the headrail.

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First Claim