| 摘要 |
A process of forming a multi-ply laminate which comprises at least one ply 2 of thermoplastics material forming a transparent outer ply of the laminate, such process comprising assembling the plies 1, 2 of the laminate, degassing its inter-ply space or spaces and subjecting it to bonding conditions including environmental laminating pressure distributed over the outside of the or each said thermoplastics outer ply 2 by a moulding plate 3 is characterised by the steps of: enveloping at least the edges of the assembled laminate plier 1, 2 and moulding plate(s) 3 by means 4 defining therewith an edge space 5 in communication with the inter-ply space(s), reducing the pressure P5 within the edge space 5 to commence degassing of the assembly and heating the assembly (curve T) while the main faces of the assembly are subjected to at least atmospheric environmental pressure P6 and subsequently, while the assembly is subjected to environment laminating pressure P6 raising the edge pressure P5 to reduce or eliminate any difference between the edge pressure P5 and the environmental laminating pressure P6 before the assembly reaches its maximum temperature T, and continuing to heat the assembly and maintaining environmental laminating pressure P6 to complete bonding of the laminate plies. |
