| 摘要 |
A method of manufacturing a fire-screening glazing panel comprising at least one layer of intumescent material 15 sandwiched between two structural plies 13, 14 of the panel comprises forming the layer and securing the plies together. In order to avoid or reduce problems associated with drying the layer 15, an assembly is made in which the structural plies 13, 14 sandwich a layer 15 of intumescent material which is constituted by one or more materials of which at least the greater part by volume is in granular form. In a second aspect, in order to facilitate degassing of the intumescent layer, such layer 15 contains intumescent material of which at least part is in the form of grains, and the intumescent material is subjected to suction at the edges of the assembly (e.g. using a vacuum pump 10 connected to an edge sealing tube 12) in a degassing step and the assembly is subjected to heat (e.g. by heaters 7,8) and/or pressure conditions (e.g. by pump 9) to cause the grains in the layer to become assimilated into an intumescent body which bonds the plies 13,14 together. The invention includes an intermediate product comprising a structural ply bearing an adherent layer constituted by material of which at least the greater part by volume consists of grains of intumescent material, to panels in which such a layer is sandwiched between two structural plies and to panels made by a method as described above. |
