IMPROVEMENTS IN MACHINERY FOR MAKING MILLBOARDS AND OTHER SIMILAR MATERIALS
Year: 1885

page_text: Similar Materials.
I BRYAN DONKIN of Eastnor House, Blackheath in the County of Kent,
Esquire and I, AUGUST LEHMANN of Colberg House, Cricklewood in the County
of Middlesex millboard maker do hereby declare the nature of our Invention for
IMPROVEMENTS IN MACHINERY FOR MAKING MILLBOARDS AND OTHER SIMILAR
MATERIALS to be as follows:-
The object of our invention is the manufacture of long sheets of various
materials, in the nature of Mill Boards, of any thickness required. By the
ordinary Millboard machine the length of the sheet is limited to that of the
circumference of the roll, round which successive thin sheets of material are
superposed, until the required thickness is obtained.
By our invention such long sheets are obtained by the use of an endless web
of the maximum length of the sheet required, the said web passing between two
pairs of press rolls placed at any desired distance apart, and then over sundry rolls
placed over or about the presses.
A second web is likewise made to pass through the same two presses above
mentioned, and being carried and driven by such rolls as are necessary; it returns
underneath the presses to the ordinary millboard machine referred to. Here it
receives the thin sheet of pulp, and by the working of the machine this thin sheet
is conducted to the first pair of press rolls described above, and thence carried
between the two endless webs to the second press, after which the under web passes
over a roll so placed that the weight of the sheet shall tend to cause it to fall upon
or adhere to the upper web, and it is carried on till it arrives again at the first pair
of press rolls. Here it meets with the thin sheet of pulp coming from the ordinary
millboard machine, which passes with it between both sets of press rolls, and
adheres to it on the upper web, so forming a second layer. This process being
continued any required thickness can be obtained, and the sheet so made will be
of the same length as that of the upper web. Between the two pairs of press rolls
above described, are placed several pairs of other press rolls which serve to support
Price 8d1

page_text: the webs and material between them, also they serve to press the water from, and
consolidate the material between the webs.
These rolls as well as the two pairs of press rolls before named should be fitted
with pressure apparatus as may be required. The under rolls of these presses
may be furnished with doctors for the removal of the water pressed out of the
material.
The apparatus is worked by such gearing, straps, rolls, and pulleys as may be
necessary.
The webs above referred to may be of felt, wire or other suitable material,
woven or otherwise.
BRYAN DONKIN.
AUGUST LEHMANN.

page_text: Improvements in Machinery for making millboards and other
similar Materials.
We, BRYAN DONKIN, of Eastnor House, Blackheath, county of Kent, Esquire,
and AUGUST LEHMANN, of Colberg House, Cricklewood, County of Middlesex,
millboard maker, do hereby declare the nature of our said invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
The object of this invention is the manufacture of long sheets of various
materials in the nature of Millboard of any thickness required.
By the ordinary Millboard machine the length of the sheet is limited to that of
the circumference of the roll round which successive thin sheets of material are
superposed until the required thickness is obtained. By this invention the thin
sheet of pulp formed on an ordinary Millboard machine, instead of being wound
round a roll of fixed dimensions, and consequently making only one length, viz.
that equal to the circumference of the roll, is made to pass between two endless
webs of felt, woven wire, or other suitable material. One of the said webs,
hereafter called the upper web, is carried by rolls overhead, and the other, here-
after called the lower web, under the machine, by rolls similar to those hereafter
described. The thin sheet of pulp after passing as mentioned between the two
webs to the point of separation of these webs is caused to be carried by the upper
web, and in due time arrives at the spot where the first thin sheet enters between
the two webs. By continuing this process any number of thin sheets may be
collected upon the upper web, and so form any thickness required, and of a length
equal to that of the said upper web. The two endless webs are made to pass
between press rolls as hereafter described, and by the pressure of these rolls the
When the
thin sheets are made to adhere together and become consolidated.
required thickness of board is obtained the sheet or board can with ease be
removed, the machine continuing to work without interruption.
By the accompanying drawing and following explanation the arrangement and
working of the new apparatus will be more fully understood.
In the drawing the upper endless web above referred to is indicated by the
letter T. T. T. and the lower endless web by B. B. B. The upper web, as will be
seen, passes between two pairs of presses P. R. and L. D. and is supported by the
rolls M. G, A. W and the small press rolls pp. pp.-The lower web passes also
between the said press rolls and leaves the upper web shortly before arriving at
the roll S¹, passing over the said roll S¹ and under the new apparatus supported
by rolls c. c. c., roll F, and the roll S₁ R as shown, and ultimately arrives at the
ordinary Board machine, from whence it receives the thin sheet of pulp made on
that machine, carrying it to the press rolls as before, described. Roll D is also the
driving roll.
For the purpose of giving more certainty of motion to the lower web the
pressure roll F is applied.

page_text: The roller S. R. is what is well known by the term stretching roll. The roll W
is so placed as shown for the purpose of preventing accumulation of water between
the two webs and the roll L. The roller S¹ should be so placed that the sheet of
pulp should have a tendency by its weight to follow the upper web rather than
the lower one. The press rolls D. L., P. R., pp. pp. should be provided with
adjustable selfacting pressure apparatus.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
The means or method of making various materials, in the nature of millboards,
of long lengths, by leading thin sheets of pulp from any millboard or paper
machine onto an endless web stretched over rolls, on which web the sheets are
superposed and made to consolidate, substantially as herein described.
Dated this 4th day of February 1886