| 摘要 |
A glazing insert for a door or a window frame is formed of a substantially rigid foam plastics material, such as polyethylene, polypropylene, P.V.C. or urea formaldehyde. The insert may be formed by moulding, extrusion, or machining operations or may be formed in situ in a channel in the door or window frame by injection of the foam plastics material into the channel. A single, double, treble, or multiple-glazed unit may be formed by positioning an insert in a frame and inserting one or more sheets of glazing material into corresponding grooves in the insert. Alternatively, the unit may be formed by supporting at least one sheet of glazing material in a channel in a frame and injecting the foam plastics material into the channel.
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