| 摘要 |
<p>1426305 Laminating press SEAL Inc 25 March 1974 [10 April 1973] 13044/74 Headings B5N and B5F A vacuum press comprises a platen assembly 4 comprising a platen and electrical heater means 140 for heating the platen, a base with a horizontal work support assembly 2 comprising a frame and a flexible air-impermeable sheet 40 mounted at its edges to the frame and means connecting the platen assembly to the base so that the platen assembly is movable into and out of engagement with the work support assembly, the platen assembly and the work support assembly when engaged providing an airtight work-receiving chamber therebetween with the platen and flexible sheet forming opposite side walls of the chamber, means, e.g. pump 52, for evacuating the chamber so that the atmospheric pressure exterior of the chamber will force the flexible sheet towards the platen and thereby compress a workpiece 230 supported on the sheet, control means for operating the electrical heater means and evacuating means so that a workpiece in the chamber is heated and compressed, and vertically movable support means 70 located below the flexible sheet for supporting the sheet at a selected height. Flexible sheet 40 which may be made from a synthetic rubber, e.g. silicone rubber, a plastics sheet or a rubber or plastics coated fabric, may be attached to a gasket 51 of resilient heatresistant material, e.g. silicone rubber. Support means 70 may comprise panel 86 made of asbestos supported by a second frame connected to the frame of the work support assembly by means comprising means for raising and lowering the second frame relative to the frame of the work support assembly. The platen assembly may comprise a rectangular frame covered by member 120 which comprises two thin aluminium plates 124 and 126 separated and secured to an honeycomb reinforcing structure 128, a flexible metal platen 132, e.g. of steel or aluminium, mounted on the underside of the frame, electrical heating means 140 comprising heating element 142 encased in heat resistant elastomeric material 144 and glass fibre heat insulating blanket 148. Clamps 64 may be provided to ensure continuous sealing between the side margins of the platen and gasket 51. The press may be used to bond a graphic arts object, e.g. a photograph, to a transparent plastics covering film coated with adhesive and a backing sheet of cardboard, a dry mounting tissue coated on both sides with hot melt adhesive being provided between the graphic arts object and backing sheet.</p> |
