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TECHNICAL SUPPORT

Got you covered – Polycotton Canvas, Coated or Laminated Industrial and Architectural Fabrics

Technical Guide Number Five

Proofed cotton canvas was first developed for use by the British Army in the Crimean War, and has been used ever since for temporary outdoor protection. The invention of polyester did not just improve the matrix of canvas, but coupled with PVC, allowed the development of synthetic tarpaulin and tenting fabrics that are widely used in transport, agricultural covers and structures. Similarly formulated polyolefin fabrics provide a lighter weight option.

This guide goes into the detail of the composition and structure of these types of fabrics, their technical specifications, and chemical resistance. It provides advice on product selection and fabrication, including allowance for dimensional change, welding and functional design, such as avoiding tear, flex cracking and potential mildewing. The reasons for the complexity of printing on plastics is explained, and also why the common practice of cutting ‘wind holes’ in banners is unnecessary.

The concept of anticlastic geometry, which is integral to the design of tension structures, is discussed; and European guidelines for fabric classification, fabrication tolerances and pre-stress are included; together with an explanation as to how biaxial tests results can be interpreted. References are provided to the calculation of Elastic Parameters for the Sattler “Atlas” range available with biaxial test results, which are available on the Nolan Group’s website.

Similarly, the concept design of Grain Bunker Storages is provided, and a calculator that allows the sizing of covers and groundsheets for particular crops and stack heights has been developed and is also available on the company’s Website.

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