Improvements in the Manufacture of Calender and Super-calender Rollers.
Year: 1898

page_text: Date of Application, 4th Mar., 1898-Accepted, 4th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Calender and Super-calender
Rollers.
I, ERNST LEHMANN, of, Fockendorf, Sachsen Altenburg, in the Empire of
Germany, Paper Manufacturer, do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:
-
The glazing calenders and super-calenders used in the textile industry and in
paper making are usually so constructed that the rollers that are placed one above
the other are alternately one a chilled cast iron roller and the next, one of paper,
wool or cotton.
As these roilers press one upon each other with very great pressure and in addition
constantly run hot by reason of friction and are further super-heated by steam
passing through the chilled cast iron rollers, the wear upon the fibre rollers is
very great because the heat and the friction burning the fibres, they lose coherence,
become hard and inelastic, and being gradually charred, crumble away.
Thus arose the problem of finding a mixture of materials for covering the
calendering rollers which would successfully resist the great wear and tear caused
by heat, and this is attained in the present invention by adding asbestos fibres to
hemp or flax fibres in mixture with compounds consisting of wool and cotton rags
in various proportions such mixtures serving for the preparation of paper for paper-
rollers.
In order to prepare a paper suitable for covering such rollers and which shall
possess the desired properties I may take
Of hemp fibre
Of half wool rags (being a mixture of wool with
cotton or linen)
Of asbestos fibre
about 10%
ور
"
35%
55%
and make paper thereof and produce rollers therefrom by hydraulic pressure or
otherwise in the usual manner.
The proportions above stated may be varied within rather wide limits without
departing from my invention, but these are the proportions which I have found to
answer well and produce the best results.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The process for producing paper for covering calender and super-calender
rollers having great resistance for high temperatures and friction, characterized
by the addition of asbestos fibre to the paper material.
2. The improvements in calendering rollers consisting of covering them with
paper produced from hemp fibre, various mixtures of wool and cotton or linen ragy

page_text: and asbestos fibre in the proportions or nearly or about the proportions hereinbefore
set forth.
3. The improvements in the manufacture of calender and super calender rollers
by adding asbestos fibres to hemp or flax fibres in mixture with compounds con-
sisting of wool and cotton rags in various proportions such as hemp fibre about
10 per cent., half wool rags (being a mixture of wool with cotton or linen) 35 per
cent., asbestos fibre 55 per cent. which proportions may be varied within rather
wide limits such mixture serving for the preparation of paper for paper rollers
produced therefrom by hydraulic pressure or otherwise in the usual manner, sub-
stantially as hereinbefore described.
Dated the Fourth day of March 1898
NEWNHAM BROWNE,
Agent for the Applicant.