IMPROVEMENTS IN THE MANUFACTURE OF PASTEBOARD
Year: 1878

page_text: LETTERS PATENT to August Julius Albert Lehmann, of Russell House, Hamp-
stead, in the County of Middlesex, for the Invention of "IMPROVEMENTS IN
THE MANUFACTURE OF PASTEBOARD."
PROVISIONAL SPECIFICATION left by the said August Julius Albert
Lehmann at the Office of the Commissioners of Patents on the 11th March
1878.
AUGUST JULIUS ALBERT LEHMANN, of Russell House, Hampstead, in the County
of Middlesex. "IMPROVEMENTS IN THE MANUFACTURE OF PASTEBOARD."
This Invention has for its object improvements in the manufacture of paste-
board.
it
There is a description of pasteboard known in the market as strawboard; a paper
made from rye straw, either alone or mixed with straw of other sorts is used in
its manufacture. This strawboard is largely employed in making boxes and in
bookbinding, and so in other ways large quantities of waste cuttings are produced,
which are of very small value. My Invention has for its object the utilization of
this waste material, which I do by putting it into a beating engine, and so working
up into pulp. This pulp is passed on to a paper machine, and in this way a sheet
in the nature of paper is obtained, but very much thicker than paper commonly
made, or than the ordinary paper machine is capable of producing. The sheets
which I thus obtain would be valueless for use by themselves, as they are deficient
in toughness, but I employ them in making strawboard, together with paper made
direct from the straw, and I form from the two materials a compound pasteboard,
of which the faces are of the straw paper, and the interior of the sheets which I
produce in the manner described from the strawboard waste.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said August Julius Albert Lehmaun in the Great Seal Patent Office on the
11th September 1878.
AUGUST JULIUS ALBERT LEHMANN, of Russell House, Hampstead, in the County
of Middlesex. "IMPROVEMENTS IN THE MANUFACTURE OF PASTEBOARD."
This Invention has for its object improvements in the manufacture of paste-
board.
There is an article known in the market as strawboard; rye straw, either alone
or mixed with straws of other sorts, is used in the manufacture. This strawboard
is largely employed in making boxes and for bookbinding, and so and in other ways
large quantities of waste cuttings are produced, which are of very small value. My
Invention has for its object the utilization of this waste material, which I do by
putting it into a beating engine, and so working it up into pulp in the manner well
understood by paper manufacturers. This pulp is passed on to a machine similar to
a paper machine, and adapted to produce sheets in the nature of paper, but very
much thicker than paper commonly made, or than the ordinary paper machine is
capable of producing. I find a thickness such that five square feet of the paper
weigh one pound to be most suitable for my purpose. The sheets which I thus
obtain would be unsuitable for the purposes for which strawboards are generally
used, as they are deficient in toughness, but I employ them in making pasted straw-
board, together with paper made direct from the straw, and such as is now employed
in making pasted strawboard, and I form from the two materials a compound pasto-
board, of which the faces are of the straw paper, and the interior of the sheets
which I produce in the manner described from the strawboard waste. Pasteboard
may be made in this way of various thicknesses, but for the purposes of which
pasted strawboard is commonly employed thicknesses of from one to four sheets,
viz., one to four sheets made from the waste enclosed between two sheets made
direct from the straw, will be suitable.
Having thus described the nature of my said Invention, and the manner of per-
forming the same, I would have it understood that I claim the manufacture of paste-
board by combining paper made from cuttings or waste of strawboard with other
paper, such as is now used in the manufacture of pasted strawboard, and which is
made direct from the straw, such first-mentioned paper being enclosed between
sheets of the last-mentioned paper, as is herein described.
In witness whereof, I, the said August Julius Albert Lehmann, have hereunto
set my hand and seal, this Nineth day of September, in the year of our
Lord One thousand eight hundred and seventy-eight.