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US5443691A Method for making cellulosic fibrous structures having at least three regions distinguished by intensive properties 失效
制造纤维素纤维结构的方法,其具有由强度特性区分的至少三个区域

Method for making cellulosic fibrous structures having at least three
regions distinguished by intensive properties
摘要:
A process for making a cellulosic fibrous structure such as paper. In one embodiment, the fibrous structure has high and low basis weight regions. The high basis weight region is subdivided into low density regions, so that a fibrous structure having three regions is produced. In a second embodiment, the fibrous structure has four regions. Both the high and low basis weight regions are further subdivided into high and low density regions. The process comprises applying noncoincident differential pressure to selected regions of an embryonic fibrous structure.
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