Willmar tribune. [volume] (Willmar, Minn.) 1895-1931, 1906-05-09
PROCESS FULL Y CO. VER1ED. ].

PR 0cESSz zFU q Y 0YERED
Holland Proosss Of Making Straw hoard
*.s is Fully Covered By Patsnt is- 8.
sued TO Ptetsr Prlns. .S..ss..: i
Pieter Prins, paper-maker for the
proposed strawboard mill at Willmar,
has received his letters patent for his
process OF making paper board out of
straw. The patent, No. 8]9, ,595, was
issued May l. The various processes
in which the Holland process differs
from the American are covered effect
ually by the specifications. These are
principally in the cutting of the straw,
the cooking, which process requires
eighteen hours less time than the one
in use in American mills, and in the
grinding of the; pulp. The specifca:
tions of the patent read as follows:
No. s1e,5 ,5e7. Specifications of Letters Pat
de 0 Nay s9S So a4 ARPsation
To All Whom it May Concerns: '@'
Be 1t known that I, Pieter Prins, subject
of Queen Wilhelmina of the Netherlands, resi-
ding at Minneapolis, in the County of Henne-
pin and State of Minnesota, have invented
certain new and useful improvements In the
process of making strawboard and do
hereby declare the following to be a full
oil oV11
such as will enable others skilled in the art to
which it appertains to make and use the
same:
My invention relates to a new and inn
proved process for making heavy paper or
board from straw; and to this end it consists
OF the mode of treatment herinafter set forth
ont in the claims.
l. The straw is cut into short sections of
about three inches in length.
z. The cut straw is placed in a closed re-
tort and is therein commingled with quick
lime In the proportion of .O6 pounds of quick
lime to each pound Of straw. The retort is
rotated for about three hours and half and
all the time steam is introduced into said re-
tort under pressure of about five atmo-
spheres per square inch so that the commin-
gled straw and quick lime is kept moist and
hot. This second step Of the process reduces
the straw to..a 6brous condition and reduces
the commingled mix ture to semifuid con-
dition. 49,,
8. The fbrous pulp is ground up. and re-
duced to a homogeneous mass. This may be
done by any suitable grinder.
4. The pulp is further reduced by beat
ing process or by intense agitation, which
also renders the pulp lighter or less dense
body.
S. The pulp is filtered and partially dried,
and
g., The dried, or partially dried pulp is
rolled, pressed, or otherwise formed into the
sheets of desired thickness to form straw
board or heavy straw paper.
In practice I have found that the above
process will effect great saving in material
and in the cost of the production of the COM
pleted board. Furthermore, I have been able
to produce better grade Of strawboard by,
the above process. What claim, and desire
to secure by Letters Patent of the United
States, is as follows:
1. process for making strawboard
which consists, first; in cutting the straw
into short sections; second, in comming1ing
the straw with quicklime within closed
compartment, and subjecting the two to the
action of steam while under agitation; third,
in grinding up the ibrous'pulp to reduce the
same to homogeneous mass; fourth in beat
ing the ground pulp, to further. reduce and
Tighten the same; fifth, in fltering and at
least partially drying the pulp; and sixth, in
forming the pulp into sheet or sheets of de-
sired thickness.
2. A process for making strawboard which
consists, first, in cutting the straw into
short sections; second, in confning the straw
in a closed retort, and commingling the same
with quicklime in the proportion of .O6
pounds of quicklime to one pound of straw,
introducing steam into the said retort under
pressure of about five atmospheres, and in
keeping up an agitation of the said straw
and quickli1ne for about three hours and a
half; third, in grinding up. the fibrous pulp
into homogeneous mass; fourth, in beating
the ground pulp to further reduce the same;
fifth, in iltering and partially drying the
same; and sixth, inpressing, rolling, or other
wise forming the pulp into sheet or sheets
of desired thickness.
In testimony whereof afix my signature
in presence of two witnesses.
Witnesses: PETER PRINS.
A. L. JONES.
e. N. BAKER.
The work of securing the condition
al subscriptions, necessary to locate
this mill at Willmar will be pushed
forward from now on. The establish
ment of this industry at Willmar will