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Patented Sept. 7, 1948
2,448,749
UNITED, STATES PATENT orrlca
'
Charles H. Van Dusen, Jr., Willoughby, Ohio, as
signer to
Addressograph-Multigraph
tion, Wilmington,
DeL, a corporation Corpora~
of Dela
ware
'
‘No Drawing. Applicatlon‘lanuary 24, ‘1947,
Serial No. 724,231
,
_ 4 Claims. (Cl. ‘lob-149.2)
This invention relates to
print
lug. More particularly, this planographic
invention relates to '.
2
age thereon, not only e?ectively eliminates‘ or
paper planographic printing plates and to a proc
prevents the reproduction of any finger prints or
resin or rosin particles or so-called resin or rosin
ess and solution for eliminating so-called ?nger
_ specks in the copies
prints and so-called resin specks
made from the thus treated
5
paper planographic printing plate but which like
wise does not in any way weaken or otherwise
interfere with the image-receptive or image-re
producing characteristics ot. the various plano
10 graphic image-forming materials which may be
employed in forming images on the treated pa
' As is well known in the art of planographic
printing paper planographic printing plates, such
per planozraphic printing plates including type
.as those which
,wr'iter image-forming materials, planographic
image-forming inks, and the like.
Accordingly, an object
of the present inven
_tion is to provide a novel process and .solution
vfor eliminating and preventing the reproduction
of ?nger prints and so-called resin and rosin
specks in the copies made from paper piano
20
graphic printing plates.
Another‘ object of, the present invention is to
provide a novel process and solution for elimi
are frequently encountered in the copies made
from paper planographic printing plates. These
rosin specks are also receptive to the greasy or
fatty acid-containing inks used in planographic
30
ages on such paper planographic printing plates
including planographic image-forming typewriter ,
ribbons, inks, crayons, and the like.
An additional object of the present invention
specks in the copies made from paperplanm,
graphic printing plates. However, insofar as
I am aware of all of such
materials have either '
been unsuccessful in eliminating the reproduc
40
weakening the image-reproducing characteris- _
tics of the image form ed on the master paper
pianographic printing plate by means of the vari
ous planographic image-forming materials used
.for this purpose and which include typewriter
image-forming inks,
. ing crayons, andlthe
like.
image-reproducing characteris
materials
forming images on
'
paper planographic printing plates including
planographic image-forming typewriter ribbons,
, inks, crayons, and
the like.
In the practice of
,
In and as the present invention I have, how
ever, found a material which when applied as a
water solution thereof to a dry or to a wet paper
planographic printing plate, and the plate then
dried, preparatory to placing a lithographic im
brushing,’ spraying or otherwise applying the
55 solution thereto. The t
2,448,749
centage, namely, ?ve per cent, by weight, of 2
preferably run between a pair of squeeze rolls
amino, 2 methyl, 1,3 propanediol in water is the
‘ and allowed to dry whereupon it may be pro
optimum percentage when the new solution is _
vided with a lithographic image by means of
applied to a dry paper planographic printing
plate or mat. I have likewise
_ found that when_
any suitable lithographic image-forming mate
rial, such as any of those hereinbefore referred
to, and then treated with an aqueous plano
graphic etching or dampening solution to condi
tion the plate for use in a planographic print
ing operation. The resulting plate is thus va
paper planographic printing plate impregnated
the new solution is applied to a wet paper plano
graphic printing plate or mat the concentration
of the solution and the quantity thereof applied
is then preferably adjusted so that the resulting
10 solution, thus diluted with and by the water in
with 2 amino, 2 methyl, 1,3 propanediol.
' I
‘ It has been found that parchment or like paper
planographic printing plates treated with the
the wet paper planographic printing plate to
which it is applied, is equivalent to a five (5) per
cent solution, by weight, and when so controlled
produces highly satisfactory solutions on paper
new solution not only do not reproduce ?nger
planographic printing plates impregnated there
prints or resin or rosin specks in the copies made 15 with. However, the exact amount of the ma
therefrom ‘but have good image-receptive and
terial to be incorporated in a parchment or like
good image-reproducing characteristics and that
paper planographic printing plate depends upon
the new solution does not in any way weaken or
and may be adjusted to variable conditions in
otherwise interfere with the image-reproducing
cluding the condition of the sheet at the time the
characteristics of the planographic image-form 20 material is applied thereto, that is, whether wet
ing material employed in forming the image
or dry, its moisture content if nominally a so
thereon.
The effectiveness of the new process and so
called dry sheet, prevailing atmospheric or room
humidity conditions, and the like.
lution were demonstrated by applying the new
It will thus be seen from the foregoing de
solution to approximately one-half of the surface 25 scription that the present invention provides a
area of the printing surface of a parchment
novel process and solution for eliminating both
planographic printing plate which was known to
?nger prints and rosinv specks in the copies re
reproduce rosin specks due to the naturally oc
curring wood rosin therein. The other half of
produced from paper planographic printing plates
treated with the new solution, and without in
the printing surface of the said parchment plate 30 terfering with either the image-receptive or the
was allowed to remain untreated.
The thus
image-reproducing characteristics of paper plan
treated parchment plate was then thoroughly de
ographic printing plates treated with the new
hydrated at room temperature and then ?nger
solution, and thus provides a paper planographic
printed throughout its entire printing surface in
printing plate having the desirable advantages
35
cluding both the treated and the untreated areas
and characteristics, and which accomplishes its
thereof. One section of the thus treated parch
intended objects,‘ including those hereinbefore
ment plate was thereupon exposed to natural
pointed out and others which are inherent in
diffused sunlight for a period of about four min
the invention.
'
.
utes and theother section was exposed to the
I claim:
rays of an ultra-violet lamp for a period of ?f 40
1. A paper planographic printing plate im
teen minutes. (Both of these treatments are
pregnated with 2 amino, 2 methyl, 1,3 propane
known to exaggerate the image-reproducing
characteristics of ?nger prints upon and of wood
rosin specks in parchment or like paper plano
'
diol..
4
2. A parchment
planographic printing plate
impregnated with 2 amino, 2 methyl, 1,3 propane
graphic printing plates.) After having been thus 45
diol;
exposed a lithographic image was applied to each
3. A paper planographic printing plate im
section of the plate, by means of a suitable'litho
pregnated with the dried residue of a ?ve per
graphic image-forming material, whereupon both
cent water solution of 2 amino, 2 methyl, 1,3
sections of the thus treated and exposed parch
50
ment plate were treated with an aqueous plano
4. A parchment planographic printing plate
graphing etching and repellent solution, fas
impregnated with the dried residue of a ?ve per
propanediol.
.
'
~ ,
tened in position of use upon the plate cylinder
cent water solution of 2 amino, 2 methyl, 1,3
of a rotary offset planographic duplicating press,
propanediol.
'
and a satisfactory edition ofcopies run there
55
from. However, the copies reproduced .from those
CHARLES H. VAN DUSEN, JR.
portions of‘ the parchment planographic printing
REFERENCES ,CITED
plate which 'was treated with the'tnew solution
did‘ not exhibit either ?nger prints- or so-called
The following references are of record in the
rosin specks whereas both ?nger prints and rosin
specks appeared prominently in the copies re-, 60 ?le of this patent:
UNITED STATES PATENTS
produced from the untreated portions of the
plate. Moreover, that area or section of the new
plate which had been treated with the new solu
tion exhibited equally as goodlimage-reproducing
characteristics and equally as long editions were 65
reproduced therefrom as were exhibited by and
reproduced from the other area or section of the
plate which had not been so treated.
It has been found that the above named per
Number
2,373,287
Name,
v
Date
Bassist __________ __ Apr. 10,-1945
OTHER REFERENCES
Chemical Industries, vol. XLV, p. 666, The Ni
tropara?ins and their Derivations, December '7,
1939.
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