To fulfil the expectations and requirements, which are at present demanded of the building material plastic window, FENSTEK Window Machinery provide some technical references and instructions, which can at any time be refined by practical initiation as well as theoretical instructions in your works.

Every material has specific characteristics, as to the chemical material PVC (polyvinyl chloride). Only by correct use and application of the materials can the full potential of the window be realised, Based on this,the window machine no matter the upvc window welding machine or upvc window cutting machine can process the perfect windowA material property which must be considered sufficiently is the relative small modulus of elasticity (Young's modulus). It is with PVC approx 2,500 N/mm2, on the other hand with steel approx. 210,000 N/mm2.

To be able to take account of the different loading groups it is necessary, from a certain window and/or element size to strengthen the reinforcement chambers of the profiles with corrosion protected steel profiles with a wall thickness of 1.5mm and/or of corresponding static requirements.

Through the action of heat and cold, longitudinal changes must be considered during the fabrication of windows and elements from thermoplastics (as PVC-U). The linear coefficient of expansion is 0.07mm/(m x.K), that is millimetre per metre of profile length times temperature differences in Kelvin. However, the length expansions resulting from it, result only by full heat penetration of the profiles.

In the case of small thermal conductivity of PVC with 0.16W/(mxK) as well as the continual temperature change e.g. position of the sun in the morning, at noon, in the evening, it is to be assumed that about a third of the value calculated is only reached in practice.

One factor however that directly influences the linear expansion of the window is the colour. If the surface temperatures of windows with white profiles reach e.g. approx 45°C, the results under the same conditions with darker profiles is up to 75°C surface temperature.

To fulfil the expectations and requirements, which are at present demanded of the building material plastic window......

• Next: FENSTEK Industry Knowledge 1-2:Storage of UPVC Profiles