Document 6RBVY1gbBjnkwLNZOQeM5Z799
( Library Report File
NINTH PROGRESS REPORT ON
STUDIES OF KAYLO
005
OWENS-ILLINOIS GLASS COMPANY
C-57334
ROLL CODE
SI 71
May 16, 1947
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3. SUBSTITUTION OP ASBESTOS BY CELLULOSE PULPS
As will be discussed in detail in the follow-
mg SBCtionf the first phase of our investigation has
proven quite conclusively that from a strength point of
view asbestc s can be successfully replaced by paper pulp,
whereby our experiments thus far were limited to Kraft
pulp as mad^ from new Kraft clippings,
I n preparing a batch of similar consistency
as now used in actual production and in obtaining satis-
factory str sjngth;
U) trie use of about 10% clay addition (whereby the
Si jo^ qf the clay is substituted for SiQ^ of the
(
ba sic batch) was found
for successful
tc Ital. substitution of asbestos by paper pulp and.
(2) tie addition of Gum Karaya for dispersion of the
filter was found to be quite helpful and is in cluded in our preferred batch formulation.
Ba tches made with paper or even paper and
asbestos mix tures are not satisfactory with respect to
hinging howe ver.
Tyjpical batch compositions are given in Table VI
under 3a and 3b.
Ov r present experience appears to indicate that
for parties! replacement of asbestos the amount of clay to
( be added maj Jje a
of thd
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typical reco; d chart in Plate II* The autoclave, boiler, program conttoller, and termperature recorder are shown in Plate III
The samples were dried as shown in the various tables and ^ndifcioned in the laboratory for 24 hours before testiji 9.
Thu asbestos and paper ware beaten on a standard paper beater and the degree of beating checked by the standard fret ness test.
.2 EVALUATION OF DATA
Close approximation of plant procedure on a
laboratory s gale introduces considerable dilficulties
with respect to reproducibility of data. The short mix-
ing time in fcarticular appears to be objectionable in
this respect
Ne yertheless, it was decided to adhere to the
above out1in d procedure rather than to adopt the methods
used in the Toledo "
Laboratory," since it was
believed that in this manner results were more directly applicable tb plant procedure.
Teh pound density was chosen for most of our
experiments, since it was assumed that differences between paper pulps and asbestos would become more notice-
able in the lighter product.
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in |conn.ecrtion with this series the effects of
and
as dispersing agents were tried,
Whils there mas some indication that these additions nave
a slightly b sneficial effect# results were not significant
enough to warrant further investigation.
4. SECOND SERIES, INFLUENCE OF DRYING TEMPERATURE
Th^ inconsistency of results, and the known properties of cellolosic materials suggested a brief investigatior of the influence of drying procedure as summarized ii Table II.
The variations in drying procedure did not show any sigi. ificant results for the Kraft samples and the average difference between asbestos and Kraft samples was even gre iiter than in the first series-
5. THIRD SI RIES, MISCELLANEOUS ADDITIONS
Ob ^ervations of the batch mixtures appeared to indicate tha paper pulp has a tendency to agglomerate during mixing in the concentrations used in our batches, The relativeLy good results previously obtained with batches conti.ining 4% Kraft where this effect would be minimized ap>tear to bear out this conclusion,
Va : ious unsuccessful approaches to obviate this are sum[narized in Table III.
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