Limitations of Manufacturing Techniques

In recent years weinor has managed to reduce creases and folds to a minimum. Nevertheless creases and folds cannot be ruled out completely, even when taking the greatest care during production. However, they never cause any real trouble and do not detract from the value of the awning in any way.

Properties of awning fabrics

The main purpose of an awning is to provide protection from the sun. It provides shade and protection from bright light, UV rays and excessive heat. In addition the shapes and colours of the fabric pattern create a pleasant atmosphere. Despite modern, complex and careful production methods, it is not possible to eliminate minor blemishes in treated fabrics. For this reason such “irregularities” cannot be accepted as cause for complaint. The technical materials we use meet stringent technical standards and are subjected to extensive laboratory tests during production. Recognised measuring techniques are used to check area weight, maximum traction force, maximum traction force stretching, tear strength, resistance to water pressure, water repellent properties, resistance to bleaching, weather resistance, sun energy behaviour and other properties rigorously.

1. Creases
are created during manufacture and when folding the fabric. A dark line may be visible where it was folded when seen against the light, particularly with light colours.

Creases

Creases

Creases look dark with the light behind them

folds

folds

Rippling near a seam

folds

folds

Rippling beside a seam

2. Rippling near a seam

Awning fabrics are usually made in lengths about 120 cm wide. When sewn together, they form an upper and a lower layer of cloth at the seams and hems. When the awning fabric is rolled, tension is created between these layers of material. Because of the thickness of the material (about 0.5 mm) the upper layer of cloth must travel further than the lower layer – the difference during just one roll is about 3.14 mm. When the whole fabric is rolled up, the seams and the hems are overstretched. This leads to sagging in this area – ripples are formed in the fabric. This unavoidable effect does not impair the quality, the function or the service life of the fabrics.

3. Effect of honeycombing

Awning fabrics are sewn in the direction of opening so that the tension is put on the warp threads. These are woven more closely than the weft threads so as to take up the pulling forces optimally. Depending on the weather and the size of the fabric, this can cause honeycombing. This effect is magnified when the light falls on it from certain angles or in the wet. In order to allow the rainwater to run off, the fabric must be inclined at an angle of at least 14°. This deters the formation of puddles and lines of dirt. Honeycombing can reach right up to the centre of the cloth. This effect does not influence the quality, function or service life of the fabrics.

You can get further information in the brochure “Richtlinien zur Beurteilung von konfektionierten Markisentüchern” [Guidelines for evaluating sewn awning fabrics] from the Industrieverband Technische Textilien-Rollladen-Sonnenschutz e.V., Fliethstraße 67, D-41061 Mönchengladbach

weinor recommends

Awnings and conservatory awnings are intended for protection from the sun and should be retracted in the rain. Creases are more likely to occur in fabric that has got wet.

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