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
الصفحة رقم: 5
tag="{http://www.w3.org/1999/xhtml}a">Sand—Oxidation streaks—Yellow streaks—Bisulphite streaks—Spot disease—Cause of—Influence of rate of drying—Percentage of moisture—Humidity of atmosphere—Prevention of disease—Infection by contact—Outbreak of dormant spores—Rules to be observed—Surface moulds or mildew—Tackiness in general—Full discussion of—Experimental reproduction—Lack of uniformity in colour—Defects in block rubber
223 CHAPTER XVIII DEFECTS IN SHEET RUBBER Defective coagulation—Coloured surface blotches—General darkening of surface—Soft coagulum—Spongy underface—Tearing—“Pitting” of surface—Thick ends or edges—Mis-shapen sheets—Thick patches—Torn sheets—“Dog-ears”—Creases—Greasiness of surface before smoking—Surface blemishes—Uneven appearance—Variation due to oxidation—Colour when dry—Surface gloss—Dull surface—Moist glaze and greasiness—Virgin spots—Surface moulds or mildew—Black streaks or spots—White or grey streaks—Rust—Theories on formation of—Prevention of—Two methods—Other views on causation—Bubbles—Causes of formation—In the field—In the factory—Blisters—“Spot” disease in sheet rubber—Support marks—Stickiness—Surface pattern—Sheet clippings—Other infrequent defects—Dirt—Ash—Bark—Splinters 249 PART V GENERAL CHAPTER XIX CHOICE OF COAGULANT Acetic acid in general use—Is a coagulant necessary?—Acetic acid—Formic acid—Citric acid—Tartaric acid—Oxalic acid—Sulphuric acid—Hydrochloric and nitric acids—Hydrofluoric acid—Alum—Pyroligneous acid—Smoked water—Chinese vinegar—Sulphurous acid—Sugars—Various salts—Proprietary compounds—Carbonic acid gas—Alcohol—Vegetable extracts