| Title of Invention | AN EROSION CONTROL BLANKET |
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| Abstract | This invention relates to a biodegradable soil erosion control blanketr comprising a non-wovwn fabric having a density of 500 to 1000 gms/m<sup>2</sup> where in said density is obtained by first converting the coir fibres into a lap by passing through sheet making machine punching the lap with rhousand of barbed needles continuously to form non-woven fabric of said density by adjusting feed of fibers inthe clute of felt making machine. |
| Full Text | FIELD OF INVENTION This invention relates to an erosion control blanks In particular, tyhis invention relates to an erosion control blanket made from coir fibre and which can advantageously be employed for soil erosion control and other soil bioengineering applications. BACKGROUND OF INVENTION It is generally known that coir fibres are extracted from coconut husk by retting or mechanical extraction. The step of retting allows an extraction of coir fibres by soaking husk in pond water or backwaters. In pond water, the step of soaking is normally carried out for 3 to 6 months. In contrast, the step of retting in backwaters is carried out for a period of 6 to 11 months. It is generally recognized that longer the period of soaking and in the presence of ebb or flow of water, better is the quality of fibre. Besides retting, fibres are separated fiom husk by mechanical extraction also, though the quality of such fibres is inferior to those obtained by the step of retting. The fibres removed or separated bom the husk are then spun into yam, which are woven into mats, mattings and other products. Erosion control blankets are known in the art and comprise a blanket made of synthetic yam. Thus, the slope is firstly graded and blanket is laid closely in contact with the soil surface. In the absence of such a blanket, gullies are formed which allow a flow of water and contribute to the erosion of soil. The presence of a blanket avoids the formation of gullies and pevents erosion of soil. When grass is planted, the roots spread and hold the soil together and the shoot protects the soil from direct rainwater drops. A distinct disadvantage with the known blankets is that it is not biodegradable. Yet another disadvantage is that such blankets woven from synthetic yam release toxic gases and acids during a slow degradatioa Reference made hereinabove is to a soil control erosion blanket comprising a fabric woven from yam abtained from coir fibres. In distinction, the present invention relates to a non-woven fabric. OBJECTS OF THE INVENTION An object of this invention is to propose a soil erosion control blanket, which is biodegradable. Another object of this invention is to propose a soil erosion control blanket, which has the required strength properties. Still another object of this invention is to propose a soil erosion control blanket formed from a non-woven fabric. Yet another object of this invention is to propose a soil erosion control blanket, which substantially arrests the movement of soil. A further object of this invention is to propose a soil erosion control blanket, which is efficient. DESCRIPTION OF INVENTION According to this invention there is provided a biodegradable soil erosion control blanket comprising a non-woven fabric having a density of 500 to 1000 gms/m2 wherein said density is obtained by first converting the coir fibres (felt) into a lap (sheet) by passing through sheet making machine, punching the lap with thousand of barbed needles continuously to form non-woven fabric of said density by adjusting feed of fibres in the clute of felt making machine. In accordance with this invention, coir fibres is obtained from coconut husk by the step of mechanical extraction. The fibres are converted into a lap (sheet) by passing through sheet making machine. The sheet is then repeatedly punched with plurality of barbed needles continuously to convert the lap into a non-woven felt. The density of the felt is controlled by adjusting by the feed of fibres in the chute of felt making machine. The range of density can be adjusted depending upon specific end use e.g. between 500 to 1000 gms/sq. meter density is required to make biodegradable soil erosion control blanket. By way of example, a typical coir needled felt is described in Table 1 TABLE 1 Width : 2.2 Mtrs. Length : 25-30 Mtrs. Form : Coir Needled Felt as available in the form of rolls Density : 500 gm/m2 750 gm/m2 1000 gm/m2 WE CLAIM; 1. A biodegradable soil erosion control blanket comprising a non- woven fabric having a density of 500 to 1000 gms/m2 wherein said density is obtained by first converting the coir fibres (felt) into a lap (sheet) by passing through sheet making machine, punching the lap with thousand of barbed needles continuously to form, non- woven fabric of said density by adjusting feed of fibres in the clute of felt making machine. 2. A biodegradable soil erosion as claimed in claim 1 wherein said blanket comprises a coir needled felt. 3. A biodegradable soil erosion control blanket substantially as herein described. |
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843-mas-2000-correspondnece-others.pdf
843-mas-2000-correspondnece-po.pdf
843-mas-2000-description(complete).pdf
843-mas-2000-description(provisional).pdf
843-mas-2000-other documents.pdf
| Patent Number | 223500 | |||||||||
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| Indian Patent Application Number | 843/MAS/2000 | |||||||||
| PG Journal Number | 47/2008 | |||||||||
| Publication Date | 21-Nov-2008 | |||||||||
| Grant Date | 11-Sep-2008 | |||||||||
| Date of Filing | 05-Oct-2000 | |||||||||
| Name of Patentee | COIR BOARD | |||||||||
| Applicant Address | KOCHI 682 016, | |||||||||
Inventors:
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| PCT International Classification Number | B41N10/02 | |||||||||
| PCT International Application Number | N/A | |||||||||
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