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Dec. 31, 1946.
2,413,664
w. c. TOLAND
PRINTING PLATE MEANS
Filed July 22, 1942
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121113211503‘.
l’atented Dec. 31,
. smo- STATES2,413,664I
PRINTING PLATE omens
William Craig Toland, Broohline, Mass, assignor
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'to William Craig Toland, trustee
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Application July 22, 1e42, Serial No. assets
3 Claims. toilet-areas)
1
2
5 are strips l of adhesive material, such as for
This invention relates to'printing and more es-‘
example Scotch tape.
pecially to planog'raphic printing plate means.
Surfaces 5% oi the marginal portions 3 are
An object of the invention'is to improveplano- .
roughened to provide a lithographic grain cor- .
graphic printing plates and to devise a composite
printing plate member‘ in which metal and other
responding to usual grained surfaces of litho- ‘
graphic printing plates. The grained surfaces t
materials are combined with‘ a view to forming
are adapted to being etched and treated with
a non-stretch ?exible printing plate, whichis‘
aqueous mixtures, thereby to form water~recep
cheap, easy to handle and sufficiently durable to
tivegrease-repellent, ricneprlnting portions of a
withstand clamping on a lithographic printing
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press. Another object is to provide a printing Hi planographic printing plate.
Mounted in the opening 2 in abutting relation
I plate holder in which colloid. plates and other ,
with respect to inner edges of the marginal por
typeset paper or plastic plates may be detach
tions 3 is a paper printing element t, which is
abiy supported. The invention also aimsto pro
preferably of a thickness corresponding to the ‘
vide improved means of securing paper printing
depth of the opening 2 so that the surface of the
plates to a printing member.
'
printing plate element @ lies in the same general
The nature of the invention will be more fully
plane with respect to the grained surface or‘ the
understood from the following description of the
> support 5. The ‘strips ‘E securely hold the ele
drawing and discussion relating thereto.
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in the accompanying drawing:
. ment @ in the base of the support 9, while per
,
mitting it to be lifted away when so desired.
As illustrative of actual dimensions, we may
Figure l is a plan view illustrating a plano=
graphic printing plate support of the invention; .
Fig. 2 is a cross section taken on the line 2—2
provide a support of zinc or aluminum having a
thickness of .015 inch, with the opening 2 having
of Fig. l and further illustrating a printing plate
element mounted in the support; and
a depth of .006 inch, and with the printing ele- >
' Fig. 3 is an enlarged fragmentary cross sec;
tional View of a modification of the invention.
The invention generally includes a frame or
ment 6 having a similar thickness of .006 inch.
The printing‘ plate element '8 is preferably
formed of paper, plastic or other materials, and
the thickness of the plate, in which is detach- .
non-printing portions 9.
includes printing portions 8 and nonaprinting
support constructed of a relatively iiexibleand
portions 9. The non-printing portions 9 of the
durable material such as sheet metal, which is
adapted to be secured to a lithographic printing 30 printing plate element .8 are arranged to occur
in abutting relation‘ with respect to the grained
press by clamping means commonly employed for
non-printing surfaces 5i oi the support it so that
‘ this purpose. The frame or support is formed
the grained surfaces ii are a continuation of the
with an opening extending throughout a part of
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As a result of this arrangement there is pro
ably supported a paper or plastic printing plate.
The surface of the paper or plastic printing plate
vided a composite planographic printing surface,
in which the grained metal surface of the support
cooperates with the non-printing portions of the
frame, which is grained to constitute non-print
printing element to maintain water-receptive
ing portions adapted to constitute a continuation
ink-repelling character at all points except where
of non-printing areas of the paper or plastic
40 printing portions of the printing element 6 occur
printing plate.
inside of its marginal edges,
Referring more in detail to the drawing, nu
occurs ?ush with the surface of the support or
meral i denotes a frame or support member
which may, for example, comprise a thin sheet
of aluminum or zinc of the type commonly em
ployed for lithographic printing plates. The sup
By this means the line ofabutment of the .
printing element with the support is maintained
from intersecting any of the printing images of
45 the printing element and no line in printed sub‘
port i is formed with an opening 2 which ex
tends throughout a substantial part of theinner -
surface of the support vi, to leave'outer marginal
portions 3.
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ject matter can subsequently appear. The out=
line itself does not become transferred since at
all points where the margin line occurs both the
support and the plate element are water-recep
In a preferred embodiment of the invention, 50 tive and hence will repel ink.
_
A number of advantages are derived from the
composite printing structure'relating to the use
of paper and plastic materials for the printing
end thereof, is extended to form grooves 5 of , ‘element 6. In using paper or plastic printing
slightly increased depth. Located in the grooves 65 plates, it is customary to clamp such _ plates
the opening 2 extends throughout a part only of
the thickness of the support I, as is better shown
in Fig. 2 of the drawing. The opening 2, at either
2,418,664
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tightly to a roll and this subjects them to
composed of paper having lithographic coatings
stresses which may, in some circumstances, tend
which may be treated to render them'suitable
for lithographic printing. Various other means
of fastening the printing element in the support
may be desired to be employed. For example,
the edges of the printing element may be beveled
‘to ?t‘ with correspondingly beveled edges in a
‘ to cause the plates to crack.
Such plates may ‘'
also be subject to stretching and shrinking when
exposed'to water as it is employed in. lithographic
Printing.
.
It will be seen that possible cracking of the
paper plates from being clamped on a roll is sub
modi?ed support, and other changes made use
stantially reduced or overcome by the composite
of.
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structure. With respect to the clamping, it is 10' While we have shown a preferred embodiment
pointed out that the marginal edges of the metal
of our invention, it should be understood that
support are available for clamping in the man
ner common to all metal lithographic plates.
various changes and modi?cations may be re
The paper plate is directly secured by the adhe
sive strips which are especially effective due to 15
the recessed arrangement of the paper, plate in
, the support whereby edges of the paper are snug
sorted to, in‘ keeping with the spirit of the in
vention as de?ned by the appended claims.
We claim:
1. A planographic printing plate‘ comprising
in combination; a thin, ?exible, support member
ly ?tted against the edges of the plate. With
presenting marginal surface portions adapted to
respect to stretching or shrinking, it should be
constitute non-printing portions, said surfaces
observed that by con?ning the paper plate in the 20 surrounding an opening in spaced relation to
opening 2 of the support, with the edges of the
the outer edges of the support member, an in
. plate in abutting relation to the edges of the
sert planographic printing plate secured. within
opening 2, there is less opportunity for the paper
the said opening and substantially ?lling the same
to become extended. At the same time by at
with its edges lying in abutting relation to the
teaching‘ the plate element to the support by 25 walls of the opening, said support member pro
means of adhesive strips, i, or by adhesive placed
viding substantial clamping edges for securing
over the entire under surface of the plate ele
the said planographic printing plate to a print
ment, this member is further prevented from
ing cylinder.
shrinking.
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The use of the frame or support 5 eliminates 30
handling of plates in many instances since the
support may be clamped on a lithographic print
.ing roll or other type of printing member, and
locked in a correct position to carry out a print
irig operation. Thereafter paper printing plate
elements may be inserted and removed from
time to time as required, with considerable sav
ing of time and labor. It is also pointed out that
the use of the frame or support 5 is particu
larly adapted to small sized plates which are not
of themselves adapted to be clamped on print-
ing machines.
‘Various other advantages are
present also, such .as savings in development 1a
bor, reduction in the amount of developing mate.
rial used, and the like.
I The support I may be formed in various ways
2. An article of the character described com
prising; a thin, ?exible, metal planographic plate
support, said support being formed with a recess
in the plate support surface in spaced relation .
to the outer edges thereof, said recess ‘being de
?ned by retaining edges, a planographic print
35 ing plate element mounted in the said opening
‘with its edges lying in abutting relation with
respect to the said retaining edges, said sup
‘v port presenting a marginal portion which is
adapted to provide non-printing portions lying in
40 the same plane with the non-printing portions of
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the said printing plate element, said marginal
portion being further adapted to provide clamp
ing edges for securing the support and plate
around the drum of a printing cylinder, thereby
45 to substantially remove tension from the print
as by forming the opening 2 with a, die, or cut
ting the opening out, or casting a metal sheet
lng element and to cooperate with the said re
taining edges of the opening in maintaining
dimensional stability in the said printing ele
having this general formation. It may be de
sired to modify the construction of the support, 50
3. An article of the character described com
as for exampleby using two supporting plates,
prising; a thin, ?exible, sheet-metal support,
one of which is formed with an opening land
said support having marginal ‘grained surface
one of which is not. Still further, it may be
portions ‘adapted to function as non-printing por
desired to provide a support in which the open
tions of a planographic printing plate, said sup
ing is cut all the way therethrough, or the open 55
port having an opening formed therein which
ing may be desired to be directly incorporated in
extends throughout a part only of the thickness
a printing roll or platen in a, lithographic print
ment.
ing machine.
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of the support,‘ a planographic printing plate
element formed of paper and resinous materials
The printing plate element may also be de
sired to be employed with a printing element such 60 secured in‘ the said opening, said plate element
being normally resistant to water, means for se
as illustrated in Fig. ,3 in which ‘a plate I0 is
curing the planographic printing element within
made up of layers of paper It and resin material
the opening, said plate element presenting print
ing portions and non-printing portions, said non
ing it adapted to form non-printing surfaces
l4, and on which may be formed printing por-_ 65 printing. portions being supported in the plane
of the grained surface of the said support, and
tions ii. In connection with the modi?cation of
said grained surface providing a clamping mar
Fig. 3, it is intended‘that the coating l3 will pref
gin for securing the support and plate element
erably be formed -'of polyvinyl alcohol and clay,
around a printing cylinder without substantial
although other colloid materials such as gelatin,
glue' and others may be desired to be employed. 70 pull being exerted on the edges of the‘ plate
element.
Still other, types of printing elements may, be
‘l2,'over which is applied a water-receptive coat- _
utilized such as printing elements composed en
tirely of plastic materials, or printing elements
WILLIAM CRAIG TOLAND.
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