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Dealing with the wind with outdoor banners

Posted by Frank Murch | May 22, 2013 5:09:00 PM

Dealing with the wind  There are a number of issues with banners and the wind.

First  it is not really the average wind speed that is the issue  it is about gusts of wind.  It is these gusts that pull a banner apart.  Most banners use grommets in the corners and edged to attach to the anchor points.

 

If wind is expected to be an issue  taking the stress over as large an area as possible will increase the banner’s durability. Banners have hems and these run the length of the banner. Placing a cord in the hem gives the maximum area for the stress to be absorbed. A grommets attach is great for lower stress but a hem cord is preferred for the wind

 

The next step is to resist the wind or pass it through. There are 3 methods:

- Often there are  “Air Relief” holes. These are half circle holes in the banner. The idea is wind will push these open and flow through  reducing the resistance on the banner. In some cities these are actually in the signage codes. This works  but it has limitations. The edges of a banner are reinforced with a hem  but the air relief slits are not. Ripping and stretching at the end of the cut can shred a banner. There is also considerable debate about gusts – a constant wind will open up the flaps  but a gusts may not.  It is generally the gusts that destroy banners.Wind

- Open mesh materials are also common.  Like having are relief slits  an open mesh allows wind to go through the banner. The advantage is the holes are very small and not cut  they have a higher resistance to tearing and sheading. The disadvantage is ink flows through these holes and makes a double sided banner impossible. Placing two banners back to back can work  but light also comes through and with it  an image breed from the opposite side. A center layer (liner) can be added  but this generally negates the open mesh. So for single sided prints  an open mesh may be the answer

 

- Use a heavier material. Many banners are made from 12 or 13 oz. material. Using an 18 ounce vinyl or heavy poly cotton increases the banners ability to resist wind more than the 150% increase in thickness. 

Download a Whitepaper! Tips to Designing  a Better Banner

Topics: Heavy duty banners, Open Mesh Banners, Air relief homes, banners damaged in wind, Wind and banners

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