Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1996-07-23
1999-01-26
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
73159, 324 711, 356431, 428212, 428218, 428219, 4283115, 4283155, 428903, 442334, B32B 2714
Patent
active
058636390
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
Franke Ralph A.
Lim Hyun S.
Marshall Larry Ray
Milone Michael P.
Raty R. Gail
Bell James J.
E. I. Du Pont de Nemours and Company
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