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US 7,922,849 B2Granted
Process and apparatus for manufacturing spun-bonded fabric
AssigneeReifenhauser GmbH & Co. Maschinenfabrik
InventorsSebastian Sommer, Wilhelm Frey
Life of this patent
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Abstract
Process of manufacturing spun-bonded fabric, using naturally crimped filaments, whereby the filaments are passed through a stretching unit and finally through a diffusor. The filaments are thereupon layered on a layering device, as crimped filaments. The layered filaments together with the layering device are passed through a solidifying device in which the filaments are solidified by means of a fluid.
Claims12
A method of making voluminous spun-bond fabric, the method comprising the steps of:
- spinning a multiplicity of extruded and continuous filaments having natural crimp and passing them downward through a closed system comprised of a cooler, a stretcher, and a diffuser and depositing them as a batt while still crimped on a gas-permeable belt screen;
- cooling the filaments with air in the cooler;
- stretching the filaments in the stretcher;
- admitting air to the diffuser or between the stretcher and the diffuser through an air inlet while excluding the entry of outside air to the closed system except for the air used for cooling in the cooler and air admitted to the diffuser or through the inlet;
- activating natural crimp of at least some of the naturally crimped filaments in the diffuser;
- displacing the filaments on the belt screen directly after being deposited and without any preconsolidation into a consolidating device;
- and
- in the consolidating device projecting a hot fluid perpendicularly against the batt to press the batt against the belt screen and thermally consolidate the filaments of the batt.
5 more elements
Dependencies are inferred from the claim text.