A roller blind (also known as Holland Blinds) is a form of window covering that is made from a fabric material specially treated or stiffened so that it hangs flat against a window. Roller blinds have simple lines and are easy to install. They are an inexpensive option for decorating rooms, thereby making them a popular choice for window covering. They can come in a variety of fabrics, colours, patterns and textures to blend with the theme of the room.
Major component description: Roller tube (aluminium), cloth (skin), chain winder or spring mechanism, bottom pocket (bottom rail) and brackets.
All Roller Blinds have a rectangular piece of fabric rolled up in an aluminium tube. The tube is attached with brackets on top of the window and operating the blind is by winding and unwinding the tube. The wind up operation can be controlled by:
Roller blinds can be fitted in the Recessed or Face Fit. An emerging trend is to fit screen fabrics in the Recess and block out fabric on the architrave as a Face Fit. It is getting popular to fit both types of fabrics as per above as a combination.
Different types of aluminium tubes are used depending on the size of the blind (width x drop) or when the blind is motorised.
A Booster spring is used to assist with blind operations when the blind goes beyond a certain size. The table below shows the relationship between blind sizes, the types of tubes used
The table below shows the relationship between blind sizes, the types of tubes used and when boosters are required/recommended.
The New cassette box will be available in 12 colours (the same as all the oval bottom rail colours with the exception of Chrome). The end caps are colour matched. The aluminium profile comes in 4.5 metres length and the maximum roller tube size it can accommodate is the 49 mm Heavy Duty tube. This equates to a single span of 3330 mm and together with the Easy Link bracket, two or more blinds can hang off the cassette box.
Spring Blind Bracket
Double Ball Chain
Ball Chain Stopper
Chain Tension Device
Chain Winder and Pin End
Bottom Rail End Caps
EasyLink Female, Male Drive & Independent (Dummy) Plug
Spring Pin End Cap
|Sidewinder||Beige, Black, Grey, Mocha, White, White Birch|
|Double Ball Chain||Beige, Black, Grey, Mocha, White, White Birch, Nickel plated steel, Stainless steel|
|Ball Chain Stopper||Clear|
|Bracket (Std 40 mm)||Beige, Black, Grey, Mocha, White, White Birch|
|Bracket (55 mm)||Beige, Black, Grey, White, White Birch|
|Combo Bracket (Std) – Single Sided||Beige, Black, Grey, Mocha, White, White Birch|
|Combo Bracket – Double Sided||Beige, Black, Grey, White, White Birch|
|Easy Link Bearing Bracket||Beige, Black, Grey, White, White Birch|
|Easylink – Male/ Female Drive Units||White, Black|
|45° Bracket||Beige, Black, Grey, White, White Birch|
|90° Bracket||Beige, Black, Grey, White, White Birch|
|Bottom Rail & End Caps - Oval||Beige, Chocolate, Chrome, Coffee, Comet, Harbor, Metallic Black, Mocha, Sash, Willow, Whisper, White, White Birch|
|Cassette Box||Beige, Chocolate, Coffee, Comet, Harbor, Metallic Black, Mocha, Sash, Willow, Whisper, White, White Birch|
|Crochet Ring Pull||Beige, Black, Brown, Burgundy, Canary, Cappuccino, Cream, Driftwood, Fawn, Fern, Grey, Ivory, Light Blue, Mint, Navy, Rose, Slate, White|
|Braid||Beige, Black, Brown, Burgundy, Canary, Cappuccino, Cream, Driftwood, Fawn, Fern, Grey, Ivory, Light Blue, Mint, Navy, Rose, Slate, White|
|Fringe||Beige, Black, Brown, Burgundy, Canary, Cappuccino, Cream, Driftwood, Fawn, Fern, Grey, Ivory, Light Blue, Mint, Navy, Rose, Slate, White|
|Plastic Ring||Apricot, Beige, Black, Blue, Brown, Dark Blue, Dark Pink, Driftwood, Federation Green, Grey, Light Blue, Maroon, Parchment, Sage Green, White|
|Metal Bolt On Ring||Silver, Gold|
|Dowell||Alabaster, Apricot, Beige, Black, Blue, Brown, Dark Blue, Dark Pink, Driftwood, Federation Green, Grey, Light Blue, Light Pink, Parchment, Sage Green, White|
|Turks Head Pull||Alabaster, Apricot, Beige, Black, Brown, Burgundy, Cappuccino, Cream, Dark Blue, Dark Pink, Driftwood, Fawn, Federation Green, Fern, Grey, Ivory, Light Blue, Mint, Navy, Parchment, Rose, Slate, White|
|Tassel with Plug||Clear Acorn, White & White Birch Cord|
Terminologies relating to Viewscape Roller Blind
|Bracket Size||The 2 side blinds||The centre blind|
|45mm (normal)||less 20mm||less 40mm|
|55mm (long bracket)||less 28mm||less 55mm|
Railroading is the term used when the blind is made with the fabric turned sideways (90°). Customers normally request blinds to be railroaded because they may want a blind wider than the available width of the fabric roll.
All woven fabrics have warp and weft threads. The warp threads are the ones that run with the roll of fabric. The weft threads are across the direction of roll. During the weaving process, the warp threads are kept in high tension, and the weft threads are the ones that shoot across, thus cannot be in high tension. Therefore, blinds perform better when the warp threads (the ones under tension) are in the vertical direction – the drop of the blind.
When a blind is railroaded, the fabric is turned sideways and the warp threads are now in the horizontal position. The higher tension in the warp threads together with the hanging of the blind encourages the edges of the blind to shrink inwards, thereby creating a cupping effect (curling of the edges).
Contract Blinds does not recommend railroading fabric. Railroaded blinds do not carry our normal warranty & are manufactured completely at the clients' risk. Oversized blinds that require railroading will be automatically produced on receipt of the order without further client contact however; clients accept all risk and costs by forwarding oversized blind orders. All other blinds on that order will not be railroaded to match the railroaded blind unless specifically requested on the clients order (even in the same location). Clients should be aware of fabric patterns and textures.
Cupping is when the side edges of the blind curls towards or away from the window. For roller blinds, cupping occurs mainly because the blind has been railroaded.
Out of square, fabric side hitting the edge, rolling out.
There are many reasons to why the blind is not rolling straight. Here are some of the reasons:
Our production facility has been designed to minimise the above issues (a-c) and every blind is fully tested to ensure that they roll up straight.
For blinds that are narrow with long drops; with ratios more than 1:2.5 (width: drop), there is a tendency for the blind to roll to one side. Frequently, windows can be out of square; therefore, final on-site adjustment may be required even though the blind has been carefully balanced at the factory.
The way to re-balance
More tape can be added or removed to 'fine tune' the balance. Note: Fine tuning should NOT require more than 3 full pieces – please ring Contract Blinds for further advice.
This is caused by excessive wear on the edge of the fabric. The most common occurrence is when the blind is severely rolling off to one side. The causes the fabric to rub against the Chain winder or Pin end.
Contract Blinds uses Crush Cut Knives to cut screen fabrics. Crush cutting has the added benefit of sealing the PVC edge. As the sealed edge is raw (not hemmed, bided or over locked, on occasions, there will be fine strands of fibre. Carefully trim off these fine fibres (if required) with a pair of sharp scissors. DO NOT pull the fibres as more fibres will be released.
The fabric is attached to the tube with a strong double sided tape. There are occasions where the fabric was peeled off the tube – the most common occurrence is overwinding the fabric. To prevent this, two ball chain stoppers are supplied with every blind. – one for the upper limit, and the second for the lower limit (the lower limit stopper prevents the roller from over unwinding). The blind is always made with additional fabric that allows the roller tube to be fully wrapped at the specified drop. The ball chain stoppers are to be fitted on site, after the blinds have been checked and balanced.
On odd occasions, we had customers complaining that the blinds have popped out of the brackets. They were for the following reasons:
Booster springs are used to assist in operating large blinds. When the blind is rolled down, a lot of the fabric is released and the blind gets heavier. The booster spring works by using the wind up energy (when the blind is lowered) to counteract some of the weight when the blind is being pulled up.
The booster spring is attached to the chain winder and assembled without pre-tensioning. This is done on site by the installer should pre-tensioning be required. Pre-tensioning is done in the following manner:
Note: Caution - NEVER pull out the chain winder when the blind is pre-tensioned.
The main component failure is as follows:
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