قراءة كتاب The Preparation of Plantation Rubber

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قراءة كتاب The Preparation of Plantation Rubber

تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"

‏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: 2

href="@public@vhost@g@gutenberg@html@files@35510@[email protected]#Sec5_1" class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">Tapping knives—Personal equation in use of knives—Choice of latex cups—Cleaning of cups—Water in cups—Premature (spontaneous) coagulation—Prevention of spontaneous coagulation—The use of anti-coagulants in the field—Collecting pails—Payment by result—Methods for calculation of yields per coolie—Tree-scrap, oxidation of—Prevention of oxidation—Bark-shavings—Collection and storage of shavings—Treatment of shavings—Collection of earth-scrap

38 CHAPTER VI TRANSPORT OF LATEX AND COAGULUM Percentages of “first” latex and other grades—Early collection of latex—Transport, nature of—Light railways—Motor-lorries—Bullock-carts—Care of transport vessels—Use of an anti-coagulant during transport—Transport by coolie—Coagulation centres (stations)—Transport of coagulum 59 PART II FACTORY OPERATIONS CHAPTER VII PRELIMINARY TREATMENT OF LATEX Reception at store—Receptacles—Jars—Tanks—Necessity for close supervision—Need for utmost cleanliness—Straining of latex—Strainers—Facilitation of straining—Bulking of latex—Standardised dilution of latex—Facilities for receiving and handling latex—Reception verandahs—Receiving vessels—Types of installations 65 CHAPTER VIII COAGULATION Choice of coagulant—Strength of acid solution—Making stock solution—Quantity for use—Quantities under modern requirements—Care in mixing—Method of mixing with latex—Use of sodium bisulphite as an anti-oxidant—Quantities for use— Formulæ—Abuse of the chemical—Residual traces in the dry rubber—Use of sodium sulphite as an anti-coagulant, quantities for use—Formulæ—Use of Formalin as anti-coagulant—Formulæ for use 74 CHAPTER IX PREPARATION OF SHEET RUBBER Pale (air-dried) sheets—Uniformity of product—Pans versus tanks—The ideal tank—Modern installations—Care of tanks—Standardised dilution of latex—Variation in dimensions and density of coagulum—Standardising instruments—Method of using—Skimming latex—Style of sheets—Standard sheets—Rolling and marking—When to work the coagulum—

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