Browse Prior Art Database

DISPOSABLE OFFSET PRINTING BLANKET

IP.com Disclosure Number: IPCOM000023482D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 246K

Publishing Venue

Xerox Disclosure Journal

Abstract

Improved prints are obtained in offset printing from an offset printing blanket comprising a self-supporting substrate and an elastomeric surface coating of at least 2 microns thick, said coating having surface deformable substantially spherical cups spaced from 1/2 to 250 microns apart for uniformly receiving. retaining and releasing ink. Thus, as opposed to the planar printing blankets which are now conventionally employed, the printing blanket described provides improved prints by use of deformable cups which are able to receive, retain and transfer more ink than is conventionally obtained by ink film splitting between two planar surfaces so as to provide prints of im-proved image density. The printing blanket can be disposed of when a job is completed if formed of inexpensive materials and the new blanket obviates the lengthy and expensive cleanup time required when relatively expensive elastomeric blanket compositions are employed because a thin elastomeric coating of, for example, from 2-10 microns can be employed as compared with typical coatings of 0.080 inch or greater now commonly employed. The blanket is prepared by coating a suitable sub-strate to include paper, plastic such as Mylar and metal such

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II

XEROX DISCLOSURE JOURNAL.

DISPOSABLE OFFSET PRINTING Proposed Classification
BLANKET U.S. Cl. 101/329
John B. Wells Int. Cl. B41f 5/00

Improved prints are obtained in offset printing from an offset
printing blanket comprising a self-supporting substrate and an
elastomeric surface coating of at least 2 microns thick, said
coating having surface deformable substantially spherical cups
spaced from 1/2 to 250 microns apart for uniformly receiving.
retaining and releasing ink. Thus, as opposed to the planar
printing blankets which are now conventionally employed, the
printing blanket described provides improved prints by use of
deformable cups which are able to receive, retain and transfer
more ink than is conventionally obtained by ink film splitting
between two planar surfaces so as to provide prints of im-
proved image density. The printing blanket can be disposed of
when a job is completed if formed of inexpensive materials and
the new blanket obviates the lengthy and expensive cleanup
time required when relatively expensive elastomeric blanket
compositions are employed because a thin elastomeric coating
of, for example, from 2-10 microns can be employed as compared
with typical coatings of 0.080 inch or greater now commonly
employed. The blanket is prepared by coating a suitable sub-
strate to include paper, plastic such as Mylar and metal such
) as aluminum with an elastomer gum such as a silicone elasto-
mer, a urethane or a rubber gum. Particles such as xero-
graphic toner which a...