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self-lubricating TEFLON* STOPCOCKS on an everyday basis! Kontes saws you money three ivays &n chemicallyinert* Teflon items! Increased production has lowered prices substantially on all Kontes Teflon Stopcocks and a p p a r a t u s which i n c o r p o r a t e them. Y«»u save, in fact, three u a \ * In lieUing Teflon products from Kontes: by reduced individual prices. b \ lower quantity prices, ami bv combining Teflon items with your regular orders for Kontes Technical Glassware for even greater discounts. COMPARE KONTES QTALITY! Teflon
Stopcock barrels are ground and polished, providing the ultimate in smooth, even turning without lubricant. Special spring-loading device keeps plug properly seated and leak-free without dangers inherent in over-tightening. Wall thickness is appreciably greater than other brands. Sidearms increase gradually in o.d. and decrease in i.d. at seals to barrels for greater strength and improved How characteristics. Order now for immediate delivery! Write for your free copy of our new Bulletin TP-1. It describes all Kontes Teflon ware including beakers, burettes, pipettes, separatory funnels, stopcocks, etc. K - S ï ï O O S T R A Ï U M T STOPCOCK prices below are t\|>ical— Size Bore. mm. Pluy size, mm. Kach
2 A 3 A
τ 2 τ4
2 3 2 4
10/25 10/25 12/30 17/40
4.50 4.30 6.90 9.20
*Teflon has almost universal chemical inertness. ®Reg. Γ.Λ/., E. I. du Pont de Nemours & Co., Inc
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•κ η W T F as G L A S S C O M P A N Y First Choice For Quality Technical Glassware Vineiand, New Jersey Midwest Distributor: Research Apparatus, Inc.. Wauconda, III.
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HEAT SEAL. An operator forms t h e t o p of Union B a g - C a m p Paper's n e w h e a t seaiabie multiwall b a g . T h e special machine heat seals t h e inner polyethylene coating, then folds over a lip coated with adhesive a n d applies a tape over t h e lip. Staggered plies make heat sealing possible, t h e c o m p a n y says
Multiwall Bag Sports Heat Seal ill Staggered plies in n e w multiwall b a g allow inner polyethylene ply to be heat sealed U M O N Bag—Camp Paper Corp. has a solution for packaging hygroscopic, deliquescent, corrosive, seniiliquid, a n d other p r o d u c t s that are hard to protect. A heat seaiabie multiwall b a g system, it's on view this week at the National Packaging Exposition in Chicago. The system actually consists of b o t h the b a g a n d bag closing m a c h i n e . Called Uniseal, the b a g is m a d e in t h e form of a tube with two to six plies of paper a n d is designed to hold 100 l b . of product. T h e inner ply is c o a t e d with polyethylene or other heat seaiabie material. T h e combinations used for the plies, U n i o n - C a m p explains, d e pend on the product being p a c k a g e d . The b a g can be m a d e u p of combina tions of kraft paper, kraft and foil, o r polyethylene coated kraft and foil. The bags' chief feature: T h e o u t e r plies a r e staggered or offset, thus leav ing t h e inner ply exposed to take a
direct heat seal. Union-Camp explains that this gets around the problem of having t o apply t h e heat seal through all t h e p a p e r plies. The plies, says t h e company, were a n insulating barrier that p r e v e n t e d heat sealing a t accept able commercial speeds. When a customer gets the bags, t h e vertical seam and t h e bottom of t h e inner ply are already heat sealed b y the b a g manufacturer. After filling, the closing machine conies into play. It heat seals the top of t h e inner ply, then applies adhesive to the tops of the outer plies. T h e entire lip is folded over and pasted to t h e outside of t h e bag so t h a t n o pressure is exerted on the heat seal. As the lip i s folded over, the machine adds a strip of 2l/2 in. g u m m e d tape, centered over the edge of t h e lip. T h e m a c h i n e operates a t a rate of six filled bags a minute. But Union-Camp
is now working on other models which will have higher speeds. Union-Camp feels that t h e hags can be quite economical in areas now held by pails, d r u m s , a n d cans. T h e y cut container a n d s h i p p i n g costs, t h e com pany says, and save on storage and shipping space. SΪ
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A new m a c h i n e for p r o d u c i n g ure t h a n e elastomer parts by continuous casting has been developed b y Mobay Chemical. It's designed especially for American production t e c h n i q u e s and materials, Mobay says, in c o m p a r i n g it to semiautomatic continuous casting machines for elastomers d e v e l o p e d in E u r o p e for a different processing method. T h e new machine can b e operated by one person horn a push-button con trol panel, Mobay explains. It has a system of variable speed p u m p s , drives, supply tanks, a n d valves, t h a t precisely control the u r e t h a n e chemicals. And casting is continuous. Production rate, says the c o m p a n y , is limited only by t h e n u m b e r of machines. Mobay has used the m a c h i n e in its laboratories to successfully cast m e t h a n e elastomer parts w e i g h i n g from 4 oz. to 96 lb. T h e c o m p a n y , however, doesn't make machinery or e q u i p m e n t for sale. It gives design a n d engineer ing aid to licensed c o m p a n i e s that want to use the method in their own plants.
Processing • N e w induced d i e f e e d e r , by Arthur Colton Co., Detroit, Mich., enables Colton single rotary tablet presses to m a k e t-··blets at rates of u p t o 1800 p e r min. An agitator and die feeder ro tors in a feed frame assembly give posi tive die fill, Colton says. Ε2 • Parabolic-shaped, disposable b a g filter, now m a d e by Arco Mfg., N e w York, Ν. Υ., is designed for air condi tioning, heating, a n d ventilating sys tems. Shape a n d material c o m b i n e to give the strongest filtering action w h e r e the dust particles are finest, according to the company. Ε 3 • Glass b a g filter units are now avail able from Dracco division of Fuller Co., Cleveland, Ohio, for collecting h o t or corrosive dust and fumes Three cleaning m e t h o d s are available: sonics,
DEVELOPMENT CHEMICALS FROM
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