Alteration-sensitive surface

Details Alteration-sensitive surface Alteration-sensitive surface

1974-12-20

1977-09-27

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

283 8B, 283 9R, 427 7, 427336, 428206, 428207, 428296, 428409, 428916, B42D 1502

Patent

active

040512959

ABSTRACT:
This invention provides an article having an alteration-sensitive surface, generally a sheet material formed of spun continuous strands of fine interconnected fibres of polyolefin, which are bonded together with heat and pressure. The surface of the sheet material is degraded by utilizing solvents, prior to imprinting desired information onto the surface, the surface then being easily abraded so as to substantially prevent alteration without permanently changing the appearance of the surface. Preferably, the surface of the sheet material is overall coated, or imprinted, with a contrasting color such that by abrading the surface the imprint is erased and the white or other natural color of the olefin fibres appears, thus increasing the visibility of the abraded surface.

REFERENCES:
patent: 2260543 (1941-10-01), Smith
patent: 2829118 (1958-04-01), Wehr
patent: 3046076 (1962-07-01), Upshur
patent: 3367150 (1968-02-01), Smith et al.
patent: 3502495 (1970-03-01), Akamatsu
patent: 3512913 (1970-05-01), Day et al.
patent: 3644080 (1972-02-01), McCullough

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