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Патент USA US2119525

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Patented June 7,1938
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I 2,119,525
vWallace '1‘. Conn, Lawrence, Mass, assignor to
the Government of the United States, repre
sented by the Secretary of Commerce
No Drawing. Application December 12, 1933,
Serial No. ‘102,033
1 Claim.‘ (01. 21-4)
(Granted under the act of March '3, 1883, as
amended April 30, 1928; 370 0. G. _75'l) ,
The invention described herein may be manu- solution of an oxidizing agent, substantially dry
factured and used by or for the Government of ing the material, and immersing the dried mate
the United Statesv for governmental purposes rial in heated tar.
without the payment to me of any royalty thereon.
In other words, my invention consists in tan
My invention relates to the preservation of 'ning the ?brous material, applying,‘ an after 5
vegetable ?bers, cordage, thread, or net, 'for the treatment, substantially drying the same, and
purpose of prolonging the service life thereof,
especially when ‘subjected to varying weather
conditions or submerged in water. The inven10 tion-also relates to the preservation of the products thus treated, and the ingredients for treating
such products_
More speci?cally, my invention relates to combining, in vegetable ?bers, chemical and bacteri-
15 cidal preservatives, such as catechu, cutch, quer-
then applying a cover or armor.
After years of study and experimentation 1
have successfully accomplished distinct improve
ments in solving the problems suggested in the 10
publications heretofore discussed, and I have applied my method of preservation to commercial
‘?sh nets in which equal bene?ts have been pro
‘ The following is one practical form of the 15
eitron, or vvother similar tanning materials, with
a mechanical armoring or waterproo?ng cover,
and impregnating the ?bers with a composition of
process. Number 6 hard laid cable cotton thread
has been tanned by soaking in an approximately
6% catechu extract aqueous solution (or 3%
a tar-dike substance,
quercitron aqueous solution) at a simmering heat
The tanning or barking of ?sh nets for the
purpose of preservation is perhaps as old as the
use of vegetable ?bers for nets and today is
practiced with various modi?cations in many
parts of the world. It is only within recent
25 times, however, that the efficacy of this principle of preservation has been recognized as a
resistance imparted to the ?ber which retards digestion of the cellulose by bacteria. Perhaps the
most valuable and certainly the most stable pro30 tective property of tars on ?sh nets is the imparted resistance to mechanical abrasion which is
comparable to armoring or sheathing. My mechamcally efficient cover, even in case of loss of
certain chemical con'stitutents, continues to pro-
35 tect a relatively delicate inclosed material and also
will materially retard solution or other changes
in the composition of the inclosed material.
Heretofore it has been proposed to apply a combination of catechu and tar treatment to ?sh nets.
40 A suggestion for such an application of catechu
and tar may be found in .“Bevaring of Garn”,
Norsk Fisheritideude, vol. V, No. 2. Bergen, April,
1886, which has been translated by Harden F.
Taylor in United States Fisheries Document 898.
45 My invention is an improved method-‘of treating
vegetable ?bers which are to be subjectedto climatic and atmospheric changes, and has distinct
advantages over that disclosed in these prior publications and further is such a process as can be
50 utilized for treating such ?bers on a large commercial scale.
of approximately 210° Fahrenheit preferably for
approximately twelve hours, then boiling the un
washed thread for approximately 15 minutes in
an approximately 1/z% aqueous solution of po
tassium dichromate, followed by thorough rins
'ing in clear water and drying. The dried tanned
thread was then immersed in coal tar for ap
proximately 3 minutes ata temperature of ap
proximately 200° Fahrenheit, drained and dried.
A coal tar found to give satisfactoryresults is
frequently known as “Fisheries speci?cation coal 30
tar” and consists of tar prepared within them]
lowing speci?cation:
Speci?c gravity at 25, C. (77,, F.) ____ __ 1104.14
specl?c Y‘smslty at 4Q C’ (104 F‘) (Engleplws 35
“"‘T". ---------------------- '
T"tf11§,§'f‘g&tiggaBypv‘geigllflgt m
. tn
t ‘
2,70‘, C‘ (518,, F ‘N t m oreth 83132 per cent
300,, C‘ (572,, F‘) ' Not more than 42 per cent
' -
per cen
Bitumen Somme m carbon blsulgltgrdgo her cent
""""""""""""""""" “T
gifts?“ ------------ -- Nmlessthan 26 Per can:
"""""""""""" " not over
per C9“
By this method vegetable ?bers will be found 45
to retain and in fact gain in tensile strength for
a long period of use in salt and fresh ?shing
waters. To my knowledge, the tensile strength
is greater after a 6 months’ period of constant use
in ?shing waters of the most destructive, nature 50 ‘
to vegetable ?bers to be found generally in lakes,
Broadly speaking‘, my invention consists in oceans, bays and rivers. Similar thread treated
soaking vegetable ?bers, cordage, thread or nets with the catechu only or the tar only disintegrated
in‘ a heated aqueous solution of a tanning agent,
55 boiling the treated ?brous material in an aqueous
under adverse conditions vwithin three weeks. ‘
I believe that the bene?t of my combination of 55
\ 9,119,525
chemical and tar treatment is due to upsetting or tar used to impregnate or cover tanned or cutched
alteration'of the natural food of cellulose digest 'materials of the class described ‘except asindi- ,
ing bacteria, thus rendering the ?ber resistant to rated in the claim.
- .a 1
bacterial digestion by a chemical change in the
What I claim is:
composition of the ?ber treated, and maintenance
The art of preserving cordage comprising the
of this altered ?ber composition over a relatively soaking thereoiI in an aqueous solution of approx 5
long period bythe tar cover or sheathing. '
imately 6% of catechu extract at approximately
210° Fahrenheit heat for approximately twelve
hours, boiling the material for approximately 15
It will be apparent from the foregoing, that by
my invention the armoring and waterproo?ng
10 e?ects of the tar conserve the bactericidal eiIect'
4 of the catechu.
‘ “"
It will be understood that the foregoing de
scription of preservation applied to ?sh nets and
twine is not to be limited to any speci?c method
15 of tanning or cutching vegetable v?bers, thread,
cordage or nets when covered with a tar-like sub
stance, nor is my invention limited to any speci?c _
minutes in an aqueous solution of approximately ‘
%% of potassium dichromate, rinsing in water‘ 10
'and drying the material thus treated, and there
after immersing the dried material for approxh "
mately 3 minutes in coal tar at a temperature of
approximately 200? Fahrenheit.
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