| 摘要 |
<p>A thermally insulated composite section, particularly for windows, doors, fascias etc., consists of two metal sections joined by at least one insulating section fixed into grooves in the metal. In its prodn., the metal sections are positioned in fixtures, outer magnetic/magnetisable strips are placed on the groove webs and press down on the webs, the space between the grooves and strips is filled by injecting or casting a cold-setting resin, the strips are removed when the resin has cured, and the composite section is moved from its fixtures. Limited usage of resin, the composite can contain one ore more resin profiles or quite small cross-section, the metals are not damaged, scratched etc. in the process. The figre shows the fixtures for prodn., with top and bottom parts of e.g. aluminium, and with holes for applying vacuum to hold metal sections in position. These have longitudinal grooves. Metal sealing strips are placed in position and, by passing a current round the outer strips, they are magnetised and press inwards, so sealing off the spaces which are filled with foaming resin. When the foam has cured, the current is switched off, the fixture vacuum is released, and the fixtures are removed. If it is desired to convey the final prod. automatically the lower holes can emit compressed air to allow easy movement on an air cushion.</p> |
