قراءة كتاب The Preparation of Plantation Rubber

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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المؤلف:

Morgan Sidney

دار النشر: Project Gutenberg

الصفحة رقم: 3

href="@public@vhost@g@gutenberg@html@files@35510@[email protected]#Sec9_16" class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">Hand-rolling—Power smooth-rolling—Marking rolls—Preparation for smoke-curing—Caution against accumulation of wet sheets—Hot-water treatment—Dripping in the open air—When to place in smoke-house

89 CHAPTER X PREPARATION OF CREPE RUBBER First consideration, fine pale crepe—Standardised dilution of latex—Coagulation and coagulant—Quantities of coagulant—Colour of rubber—Sodium bisulphite (use of)—Evaluation and deterioration of the bisulphite and sulphite of sodium—To distinguish between these two chemicals—Care of sodium bisulphite—Mixing solution with latex—Former methods of making pale rubber—Working the coagulum—Lower grades of crepe—Naturally coagulated lump—Skimmings and washings—Tree-scrap—Bark-shavings—Earth-scrap—Fibrous matter in low-grade rubbers—Scrap-washers—Compound crepes—Increased care with lower grades—Block rubber from crepe—Smoked crepe versus sheet clippings 110 CHAPTER XI DRYING OF RUBBER Air-drying of crepes—Artificial driers for crepes—Vacuum drying—Hot-air driers—Michie-Golledge system—Rate of air-drying—When drying takes place—Increase in weight of drying crepe—Differences in weight—Aids to normal drying—Smoke-curing of sheet rubber—Instruments for recording temperature—Temperatures of smoke-house—Period of drying—Fuels for smoking—Sun-drying of sheet rubber—Artificial driers for sheet rubber 132 CHAPTER XII SORTING, GRADING, AND PACKING Reducing number of grades—Reduction carried too far—R.G.A. recommendations—Care in sorting—Choice of packing cases—Bags—Bales—Folding of crepe—Mechanical folders—Care in assembling—Methods of packing—Weight of contents—Short weights 150 PART III MACHINERY AND BUILDINGS CHAPTER XIII MACHINES Quality of metal in rolls—Nature of roll-bearings—Brass liners—Liners of alloy or of cast-iron—Adequacy of machines—Arrangement of battery—Speed of machines—Gear ratios—Grooving of rolls—Heating of rolls—Sheeting machines—Lubrication—

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