Nonwoven sheet products made from plexifilamentary film fibril w

Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With testing – measuring – and/or indicating means

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378 86, 378 88, 382141, 264 401, G01R 900

Patent

active

06070635&

ABSTRACT:
This invention relates to improved sheet products and specifically to improved nonwoven sheet products made from highly oriented plexifilamentary film-fibril webs. The improved sheet products have high opacity and strength with a much wider range of porosity or Gurley Hill Porosity Values. In particular, sheet products made in accordance with the present invention have considerably higher Gurley Hill Porosity Values than similar weight sheet products subject to the same finishing treatments in accordance with prior known sheet materials. Similarly, sheet products made in accordance with the present invention can be made which have much lower Gurley Hill Porosity Values than prior sheet materials. The invention includes numerous methods and data characterizing the webs and sheets that form the improved sheet materials.

REFERENCES:
patent: 3081519 (1963-03-01), Blades et al.
patent: 3169899 (1965-02-01), Steuber
patent: 3227784 (1966-01-01), Blades et al.
patent: 3227794 (1966-01-01), Anderson et al.
patent: 3851023 (1974-11-01), Brethauer et al.
patent: 5123983 (1992-06-01), Marshall

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