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قراءة كتاب The Preparation of Plantation Rubber

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‏اللغة: English
The Preparation of Plantation Rubber

The Preparation of Plantation Rubber

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دار النشر: Project Gutenberg
الصفحة رقم: 5

tag="{http://www.w3.org/1999/xhtml}a">Sand—Oxidation streaksYellow streaksBisulphite streaksSpot diseaseCause ofInfluence of rate of dryingPercentage of moistureHumidity of atmospherePrevention of diseaseInfection by contactOutbreak of dormant sporesRules to be observedSurface moulds or mildewTackiness in generalFull discussion ofExperimental reproductionLack of uniformity in colourDefects in block rubber

223   CHAPTER XVIII DEFECTS IN SHEET RUBBER   Defective coagulationColoured surface blotchesGeneral darkening of surfaceSoft coagulumSpongy underfaceTearing“Pitting” of surfaceThick ends or edgesMis-shapen sheetsThick patchesTorn sheets“Dog-ears”CreasesGreasiness of surface before smokingSurface blemishesUneven appearanceVariation due to oxidationColour when drySurface glossDull surfaceMoist glaze and greasinessVirgin spotsSurface moulds or mildewBlack streaks or spotsWhite or grey streaksRustTheories on formation ofPrevention ofTwo methodsOther views on causationBubblesCauses of formationIn the fieldIn the factoryBlisters“Spot” disease in sheet rubberSupport marksStickinessSurface patternSheet clippingsOther infrequent defectsDirtAshBarkSplinters 249   PART V GENERAL   CHAPTER XIX CHOICE OF COAGULANT   Acetic acid in general useIs a coagulant necessary?Acetic acidFormic acidCitric acidTartaric acidOxalic acidSulphuric acidHydrochloric and nitric acidsHydrofluoric acidAlumPyroligneous acidSmoked waterChinese vinegarSulphurous acidSugarsVarious saltsProprietary compoundsCarbonic acid gasAlcoholVegetable extracts

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