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US 5,219,620 AGranted
Method and apparatus for foam treating pile fabrics
AssigneeE. I. Du Pont de Nemours and Company
InventorsJerry F. Potter, W. Lamar Brown
Life of this patent
Estimating the term…
Abstract
The invention involves a process for foam treating pile fabrics, especially carpets, by applying a foam composition through the backing of the fabric. The fabric is wrapped partially around the foam applicator at a wrap angle of at least 60 degrees, while the facing of the fabric is free of pressure. A foam applicator is also taught.
Claims6
A process for foam treating a pile fabric, comprising the steps of:
- a) passing the fabric through an application zone, comprising a slotted foam applicator positioned between a pair of rollers, whereby the backing of the fabric is wrapped partially around the applicator at a wrap angle of at least 60 degrees to promote fanning of the pile, while the facing of the fabric is free of pressure;
- and
- b) applying a foam composition from the applicator, through the backing of the fabric, at a wet pick-up level in the range of about 10 to 30%, whereby the composition penetrates throughout the fabric.
Dependencies are inferred from the claim text.