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Materials Used in Rolling Shutter:
Rolling shutters are a type of door normally used for godowns and shops. The specification of rolling shutter shall be as per the requirement of the client. Here I am trying to put general information about rolling shutter and its materials, fixing methods and other details.
Metal Rolling Shutters should conform to IS:6248. The rolling shutter accessories should be as specified and approved should be suitable for fixing in position as specified i.e. outside or inside; on or below lintel or between jambs of the opening.
Rolling shutter can be hand operated or gear operated. Hand operated shutters are of push and pull type. Gear operated shutters are provided with reduction gear operated by mechanical device with chain, crank, shaft and handle. The shutter consist of 80 mm wide MS laths 1.25 mm thick or gauge as specified of mild steel sheet machine rolled. Laths are inter-locked together throughout its entire length and jointed together at the end with end locks. These are mounted on specially designed pipe shaft.
Cold Rolled Steel Strips
Cold Rolled Steel Strips used for rolling shutter lath sections shall conform to temper No. 5, Dead soft quality of IS:4030.
GI Sheets and Plates used for manufacturing the guide channels, brackets and lock plate should be of hot rolled steel of thickness not less than 18 gauge conforming to IS:5986. These shall be free from surface defects and the edges shall be cleanly sheared. All components of rolling shutter to be hot dip galvanised with a zinc coating containing not less than 97.5% pure zinc. The minimum weight of zinc coating to be 230 g/sq.m.. The coating shall be free from flaking/peeling.
GI Pipes used for the suspension shaft of the roller should be heavy duty pipe suitable for mechanical purposes and shall conform to IS:1161.
Cast Iron Castings
Cast Iron Castings used for roller pulley wheels, U-clamps shall conform to Grade 15 of IS:210. These should be free of blow holes, surface defects such as cracks, burrs etc.
The springs used in the roller for counter balancing the rolling shutter should be made either from high tensile spring steel wire or flat spring steel strip. The spring steel wire used or helical spring should conform to Grade 2 of IS:4454. Flat spring steel strip used for spiral spring shall be from 0.8 to 1.0 percent carbon steel strip especially hardened and tempered.
Both the side guides and bottom rails are jointless and of single piece of pressed steel of minimum 16 gauge thickness. The top cover of shaft, spring etc. should be of the same materials as that of lath.Hood, brackets etc. are required to cover the shaft etc. The reduction gear arrangement operated by the mechanical device should be of the best quality and easy in operation.
Fixing of Rolling Shutter
First the brackets are fixed on the lintel/beam or under the lintel/beam as required with rawl plugs and screws, bolts, washers etc. The shafts along with the spring are then fixed on the brackets. The lath portion (shutters) is laid on ground and the side guide channels are bound with it. The shutter is then placed in position. The side guide channels are fixed to the wall through the plates welded to the guides. These plates and brackets should be fixed by means of steel screws, bolts and rawl plugs drilled into the wall.
The plates and screws, bolts shall be concealed in plaster to make their locations invisible. Fixing should be done accurately so that the operation of the shutter is easy and smooth. The smooth and easy working of shutters are ensured. To prevent rusting of shutters, it is cleaned off dust, scales, rust etc. and priming with a coat of red oxide paint is done before fixing the shutter in position and then it is painted with two coats of flat/synthetic enamel paint.
Measurement of Rolling Shutter:
The rolling shutter is measured in terms of area in square m (SQM), the payable area shall be obtained from the net opening for which the rolling shutter has been provided.
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