Green Guide Normal For Ribbed Smoked Sheets
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Posted On :
Aug-22-2011
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Article Word Count :
697
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NR in sheet forms are the oldest and the most popular type.
Being the simplest and easiest to produce on a small sacle,
small holder's rubber in most of the countries are processed
and marketed as sheet rubber.
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NR in sheet forms are the oldest and the most popular type. Being the simplest and easiest to produce on a small sacle, small holder's rubber in most of the countries are processed and marketed as sheet rubber. Two types of sheet Rubbers are produced and marketed in the international market, namely the Ribbed smoked sheets and the Air Dried Sheets(ADS). Among these two types, Ribbed smoked sheet is the most popular and is available for volume consumption.
Ribbed smoked sheets are marketed based on visual assessment of quality. To establish acceptable grades for commercial purposes, the international Rubber Quality and Packing conference, have stipulated the grade description and the details are given in the Green Book.
Only deliberately coagulated rubber latex processed into rubber sheets, properly dried and smoked can be used in making RSS. The following prohibitions are also applicable to the RSS grade.
Prior to grading RSS, the sheets are separated, inspected and any blemishes are removed by cutting with a pair of scissors.
Each bale must be packed free of mould but very slight traces of dry mould on wrappers or bale surfaces adjacent to wrapper found at the time of delivery will not be objected to provided there is no penetration of mould inside the bale. Oxidised spots or streaks, weak, heated, undercured, oversmoked, opaque and burnt sheets are not permissible.
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The rubber must be dry, clean, strong sound and from blemishes, rust, blisters, sand, dirty packing and any other foreign matter, except slight specks. Small pinhead bubbles, if scattered, will not be objected to.
Slight rust, and slight amount of dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to, provided these conditions either singly or in combination, do not exist to an objectionable extent on and in more than 5% of the number of bales included in the delivery, lot or tender as determined by the number of bales inspected.
Small bubbles and slight specks of barks, if catteres, will not be objected to.
Oxidised spots or streaks, weak, heated, undercured, oversmoked, opaque and burnt are not permissible. The rubber must be dry, clean, strong, sound and free from blemishes, blisters, sand, dirty packing and all other foreign matter other than specified above as permissible.
Rust and dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to, provided these conditions, either singly or in combination, do not exist to an objectionable extent on and in more than 10% of the number of bales included in the delivery, lot or tender as determined by the number of bales inspected. Slight blemishes in clour, small bubbles ans small specks of bark permissible. Oxidised spots or streaks, weak, heated, undercured, oversmoked, opaque and burnt sheets are not permissible. The rubber must be dry, strong and free of blemishes, blisters, sand dirty packing and all other foreign matter other than specified above as permissible.
Rust, dry mould on wrappers, bale surfaces and interior sheets, found at time delivery will not be objected to provided these conditions, either singly or in combination, do not exist to an objectionable extent on or in more than 20% of the number of bales included in the delivry, lot or tender as deteremined by the number of bales inspected.
Medium size bark particles, bubbles, translucent stains, slightly sticky and slightly over smoked rubber as permissible but should not be evident to a marked degree. Oxidised spots, or streaks, weak, heated, undercured opaque and burnt sheets are not permissible. The rubber must be dry, firm and free of blemishes, blisters, sand, dirty packing and all other foreign matter other than specified above as permissible.
Rust, dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to provided these conditions, either singly or in combination, do not exist to an objectionable extent on or in more than 30% of the number of bales included in the delivery, lot or tender as determined by the number of bales inspected.
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rubber sheet,
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