By J. M. Davies
Sandwich panels are getting used more and more because the cladding of constructions like factories, warehouses, chilly shops and retail sheds. this is why they're mild in weight, thermally effective, aesthetically beautiful and will be simply dealt with and erected. notwithstanding, thus far, an authoritative e-book at the topic was once missing. This new reference paintings goals to fill that gap.
The fashion designer, specifier and producer of sandwich panels all require loads of info on a variety of topics. This ebook was once written via a bunch of ecu specialists lower than the editorship of a united kingdom expert in light-weight development. It presents information on:
* fabrics utilized in manufacture
* thermal potency and air- and water-tightness
* acoustic performance
* functionality in fire
* durability
* detailed difficulties of sandwich panels in chilly shops and relax rooms
* architectural and aesthetic considerations
* structural layout on the final and serviceability restrict states
* extra structural issues together with fastenings, the influence of openings and using sandwich panels as load-bearing walls
* try out procedures
The booklet concludes with a few numerical layout examples and is extremely illustrated all through.
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Additional resources for Lightweight Sandwich Construction
Example text
Glass wool slabs can be produced in the same way from a melting mixture of quartz sand, soda and limestone or recycled glass. In another production method (the TEL-method) the melt is pressed or drawn through nozzles by means of compressed air. The properties of glass wool are similar to those of stone wool except for a lower melting point and an increased amount of binding agent which is usually between 4 and 15%. Stone wool fibres have a mean length of 2±4 mm and a mean thickness of 3±7 mm. Glass fibres are longer, with a mean length of 5±10 mm, but have the same range of thicknesses.
The extremely small value of the heat transfer coefficient of PUR should be noted. It should also be observed that this value is not significantly dependent on the density within the usual range of practical applications in sandwich panel construction. The thermal conductivity of most insulating materials is also temperature dependent. Usually, the relationship between the thermal conductivity and temperature is approximately linear but this is not the case with PUR. In calculating the thickness of insulation required, the operating temperature for the particular application must be considered.
4. In this context, the resistance is mainly concerned with the time to first maintenance rather than the total deterioration of the sheeting. The stability of the appearance (colours) is also shown on a similar scale. Coatings must also resist scratches and wear. 5 gives some properties of coatings with respect to wear and other durability aspects. The pencil hardness indicates resistance against the penetration of sharp objects. e. the ability to reflect light, is also given. There are several standard tests for wear which give different results.