Improvements in Printers' Roller Composition or the like.
Year: 1897

page_text: Improvements in Printers' Roller Composition or the like.
I, WILLIAM JOSEPH JOHN HAWKINS, of 128, Euston Road, in the County of
Middlesex, Manufacturer of Printers' Roller Composition, do hereby declare the
nature of this invention to be as follows:-
The invention relates to improvements in printers roller composition or the like.
It is well known that the composition employed for the manufacture of printers
rollers is much affected by atmospheric changes that is to say in hot dry weather it
will part with some of its moisture and shrink or contract whilst in damp weather
it will take up a considerable proportion of moisture and correspondingly swell and
these variations are so pronounced that it is necessary frequently to regulate the
bearings of the rollers in order to compensate therefor.
Now the object of the present invention is to obtain a composition which will be
less affected or remain unaffected by the varying conditions of the atmosphere by
removing or modifying the difficulty above pointed out, and which by reason of its
being more or less impervious to water will be especially suitable for lithographic
rollers.
In carrying the present invention into effect the composition is composed of the
following ingredients in or in about the proportions stated namely:

page_text: Although the invention is hereinbefore described in connection with printers and
lithographic rollers it will be understood that it is equally applicable to similar
compositions employed in the manufacture of the well known gelatinous printing
surfaces.
DAL
T
Improvements in Printers' Roller Composition or the like.
I, WILLIAM JOSEPH JOHN HAWKINS, of 128, Euston Road, in the County of
Middlesex, Manufacturer of Printers' Roller Composition, do hereby declare the
nature of this invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :--
The invention relates to improvements in printers roller composition or the like.
It is well known that the composition employed for the manufacture of printers
rollers is much affected by atmospheric changes, that is to say in hot dry weather
it will part with some of its moisture and shrink or contract, whilst in damp
weather it will take up a considerable proportion of moisture and correspondingly
swell, and these variations are so pronounced that it is necessary frequently to
regulate the bearings of the rollers in order to compensate therefor.
Now the object of the present invention is to obtain a composition which will be
less affected or remain unaffected by the varying conditions of the atmosphere, and
thus remove or modify the difficulty above pointed out, and which composition by
reason of its being more or less impervious to water will be especially suitable for
lithographic rollers.
In carrying the present invention into effect the composition is composed of the
following ingredients in or in about the proportions stated, namely:-
In combining these ingredients the glue is according to the first formula soaked
in the water until it has completely absorbed the same the glycerine is then heated
in a steam jacketed vessel and the water saturated glue is slowly added thereto in
small pieces until the whole of the glue has combined with the glycerine during
which operation the mass is continuously stirred and ultimately assumes a more or
less fluid consistency.
The skimmed milk which has been previously heated to about the same tempera-
ture as that of the melted mass is then slowly and gradually added thereto the
mass being continuously stirred during this operation and the whole mass isboiled
and stirred until the several ingredients are completely incorporated or blended.
Or according to the second formula the glue is boiled in the milk until it is
dissolved and in that form is added to the already heated glycerine.

page_text: The composition above described is more especially suitable for lithographic
rollers but when it is intended to be employed for inking rollers to be used in letter
press printing the quantity of glycerine should be increased to, say, five pounds more
or less and a similar quantity of sugar should also be added.
The proportions of the ingredients named have experimentally been successfully
employed but it will be understood that in practice it may be found that such
proportions may be varied with advantage, and when employing water it is
desirable that the percentage thereof should be kept as low as possible consistent
with the proper melting of the glue.
Although the invention is hereinbefore described in connection with printers
and lithographic rollers it will be understood that it is equally applicable to similar
compositions employed in the manufacture of the well known gelatinous printing
surfaces.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is
1. In the manufacture of printers roller composition or the like the combination
of glue, glycerine, separated milk, and sometimes water and sugar in manner
substantially as herein described and in or in about the proportions stated.
2. In combination with printers roller composition or the like a suitable pro-
portion of separated milk substantially as herein described.
Dated this Oth day of Anil 1908
WHITE & WOODINGTON,
Birkbeck Bank Chambers, Southampton Buildings, London, Agents.