Apparatus for continuous hot air bonding a nonwoven web
AssigneeE. I. Du Pont de Nemours and Company
InventorJames Fletcher Baxter
Life of this patent
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Abstract
A nonwoven web of thermoplastic filaments is thermally bonded by conveying the web on a rotating hollow cylindrical roll having a pervious surface and passing hot air through the web into the roll to heat the filaments to the bonding temperature. The web is restrained against the roll surface with a stationary porous fabric under pressure developed by flow of the hot air through the fabric. Means for adjusting the length of fabric in contact with the web, and for measuring tension on the fabric, are provided in the apparatus.
Claims1
In an apparatus which includes a rotating hollow cylindrical roll having a pervious surface for conveying a web and means for passing hot air through the web and into the roll over the distance the web is conveyed on the roll;
- the improvement for thermally bonding a web of thermoplastic filaments which comprises a stationary porous fabric for restraining the web against the roll surface for a distance of about 35 inches under pressure developed by flow of the hot air through the fabric, the fabric having one end free and being held stationary by tension means which includes fabric supply means for adjusting the length of fabric in contact with the web on the roll, a pressure sensing roll located between the supply means and contact of the fabric with the web on the roll, and means for measuring tension on the fabric.
Dependencies are inferred from the claim text.