Upload
vanthuan
View
217
Download
2
Embed Size (px)
Citation preview
^ -ï^'è-^&s.S^â
/?. G, Macdonald, secretary of TAPPI; Edwin C. John, l\eiv York State College of Forestry, chairman of conference; W. F. Gillespie,
\*jÊmmm Bogalusa, La., president of TAM*PL K. W\ Britt, Scott Paper Co.9 and Sam -S. GZutkin, Falk and Co., tvere speakers at conjer-^nce dinner
ΙΙΓΠ lu il I cr r me Features Plasties A STAFF REPORT
JL H E first fall meeting of the Technical Association of the Pulp and Paper Indust ry on plastics in pulp and paper was held a t Liic New York State College of Forestry, Syracuse, X. Y., Sept. 25 and 26. The meeting Λ\ as organized by the TAPPI plasties c« niinii .eo of which Edwin C. J ahn , professer of forest chemistry at Syracuse, is chairman. Over 100 representat ives of the paper and the plastics industries were in a t tendance.
With the emphasis on discussion, sessions were devoted to the principal phases of the committee 's work—new resins and their application to paper, resin analysis, and fabrication and conversion. Following the conference dinner at Hotel S}rra-cuse, S. S. Gutkin of Falk and Co. read a paper on plastics for paper coating and K. W. Br i t t of the Scott Paper Co. discussed wet-strength resins.
The experience of the Howard Smith Paper Mills, Ltd., in the use of lignin for paper impregnation was described by G. H . Tomlinson on the session on new resins over which R. A. BarkhufT, Jr . , of the Monsanto Chemical Co. presided. The Howard Smith Mill a t Cornwall, Ont-, is separat ing lignin from soda process black liquor by t r ea tmen t with flue gas which
throws out the lignin as an acid salt. T h e tarry mass is dissolved in water and reprecipitated with sulfuric acid to give a finely divided product. Added to pulp in the beater in the proportions, 4 0 % lignin, 6 0 % fiber, the lignin melts when heated during lamination and forms a waterproof coating around the fiber. The Cornwall mill is producing 120,000 lb. of lignin and 250,000 to 300,000 lb. of laminate per month.
Other new resins for paper discussed a t this session were polyester resins, by D . G. Pat terson of American Cyanamid Co., styrene-butadiene copolymer, by Ε . Κ. Stilbert of the Dow Chemical Co., and vinyl chloride-vinyl acetate (Vin3'on), by H. E. Shearer of American Viscose Co. Silicone resins for paper sizing were also discussed by Carl Bergendahl of the New York State College of Forestry.
Wet-Strength Papers T. A. Howells of the Ins t i tu te of Paper
Chemistry presided over the session on resin analysis. Discussing present practice in the laminating industry, L. V. Larson of General Electric Co. pointed out two viewpoints in resin analysis— tha t of the manufacturer, who wants a
method t-o reflect t h e amount of solide he p u t ίη-to ttk« product, and tha t of the user„ who waotts a m e t h o d to show the amount o f recoverable resin. A plea for uniformity of methods by both manufacturer a-nd use r was voiced.
I n his talk, on wet-s t rength papers, Mr. Britt, who is chairman of the T A P P I Wet Strength Commit tee , s tated t h a t the advantage of wet-strength paper is no1 confined "t-o i t s strength when wet. Reporting s tudies over a n extended range of moisture, Mr. Britt showed tha t while wet-strength paper is eight times as strong as untrea-ted paper a t moistures above 409e, it is also stronger in merely damp or nearly dr~y atmospheres. He estimates that 300,000 t o n s of wet-strength paper are being made in t h i s country per year
Tr ie third technical session of the conference vs.-as dlevoted to discussions on fabrication arnd conversion with R. H. Mosher o f the Marvellum Co. as chairman . Topics treated included "Resin Treated Pape-xs for Plywood Overlays-and for Hone ν comb Core Mater ia ls" by R. J. Seicil of the U . S. Forest Products Laboratory'ara.d "Causes of Dimensional Instabi l i ty Dm.̂ to Immersion in Water ' by C J. Strakia of Westinghouse Electric and Manufacturing C o .
T l i e filial session w a s reserved for discussion o f qmestions raised in previou? sessions.
Harry Kline, Reichhold Chemicals; R. A. Barkhujf, Jr., Monsanto; R. T. Bingham, assistant to secre
tary of TAPPI; R. J. SeidZ, Forrest Products Lab.; G. H. Tomlinson, Hovc<xrd S m i k / i Paper Mills, Ltd.
«974 C H E M I C A L A M D Ε NG I N E E R I N G N E W S