| 摘要 |
The sash consists essentially of plastic profiles with hollows and cavities intended to increase the stiffness (strength) and thermal insulation and to receive, optionally, a shade and a fly screen, and with stiffening (strengthening) elements 18, 18', 20, 20' of high-strength material, for example metal, inserted by sliding in predetermined cavities and/or hollows, while the window sash 12 is formed by welding its plastic profiles in such a way as to prevent, with a high degree of reliability, the problems due to the differences in thermal expansion. <IMAGE>
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