Perforated closed-cell foamed material and method for manufacture
OwnerMario Loriniinventor
Life of this patent
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Abstract
A method of manufacturing a layer of material adapted for use as carpet underlay (though not restricted thereto), from a sheet having two opposed surfaces with one surface being intended to contact the carpet when used for that purpose. The method involves partly perforating the sheet by inserting, through one said surface, an array of needles, thus providing passageways for the escape of air from the cells when the layer is compressively loaded, and for the return of air to the cells when the load is removed.
Claims18
A method of manufacturing a layer of material from a sheet of plastic material having generally closed cells, the sheet having two opposed surfaces, the method comprising partly perforating said sheet by inserting part-way into the sheet, through at least one of said surfaces, an array of needles, thereby providing passageways for the escape of air from at least some of the cells when a load is applied to the layer, and for the return of air to the cells when the load is removed.
A layer comprising a sheet of generally closed-cell plastic material, the sheet having two opposed surfaces, said sheet having a plurality of passageways extending part-way into the sheet, from one of said surfaces, the passageways being the result of penetration by an array of needles, said passageways allowing for the escape of air from the cells when a load is applied to the layer, and for the return of air to the cells when the load is removed.
Dependencies are inferred from the claim text.