Патент USA US2119525код для вставки
Patented June 7,1938 - > a - ‘ r ., I 2,119,525 UNITED STATES PATENT OFFICE 2,119,525‘ PRESEBVATIVE PROCESS FOR. VEGETABLE FIBERS 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, 1 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 duced. _ - ‘ 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 , , 20 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 o 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 . . . o o specl?c Y‘smslty at 4Q C’ (104 F‘) (Engleplws 35 “"‘T". ---------------------- ' T"tf11§,§'f‘g&tiggaBypv‘geigllflgt m . tn 7 ‘ t ‘ 2,70‘, C‘ (518,, F ‘N t m oreth 83132 per cent 300,, C‘ (572,, F‘) ' Not more than 42 per cent ' ' I ' - ° ore I an per cen 0 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 2 . . \ 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. 1 z - .a 1 v 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. - WAILACE T. CONN.