Process of producing windable spunlaid materials and products therefrom
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United States of America Patent
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app pub date -
Aug 5, 2003
filing date -
Jul 22, 2003
priority date (Note) -
Abandoned
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Abstract
A process for producing a windable spunlaid material, and a product produced by the process, wherein minimal web compaction occurs and thermal, mechanical and chemical prebonding is not necessary. Filaments are produced and laid on a moving support to provide a web having a machine direction tensile strength of less than 5 N per 5 cm at a basis weight of 50 gsm. The web is then passed through a compacting calender. The filaments of the spunlaid web are not subjected to a temperature exceeding the melting point of the filaments. Preferably, the calender through which the web passes has a surface temperature of less than 130.degree. C. at a calender nip pressure of 30 N/mm. The resulting web is windable under low tension, i.e., a tension of less than 40 N/m. The wound spunlaid material can then be stored and/or transport, to provide a nonwoven material.
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