GB985823A - Honeycomb materials - Google Patents

Abstract

985,823. Laminates and laminating. DUFAYLITE DEVELOPMENTS Ltd. Aug. 31, 1962 [Sept. 6, 1961], No. 32042/61. Heading B5N. In apparatus for expanding slices of non- metallic honeycomb, e.g. paper, cardboard or thermoset resin-impregnated paper to yield a stabilized material, which may be used as such as a packing material, slices of preformed honeycomb are bonded together by stripes of adhesive while being pressed forward by a reciprocated bar 4, Fig. 1, in front of which the slices are placed manually, towards a sponge rubber roller gripping device 109, which tends to resist further advancement. A second gripping device in the form of an endless conveyer having transverse rods 132 provided with pins 133 for engaging the honeycomb is driven much faster than the roller 109 so that the material is expanded between the two gripping devices. During expansion the honeycomb is supported on a slightly upwardly inclined track of parallel wires to facilitate disengagement of the pins 133. The honeycomb is then fed through a heated chamber to stabilize or consolidate the sheet, e.g. in a curing chamber for thermosetting resin-impregnated paper or a drying chamber for paper or cardboard containing moisture. To strengthen the material further, or for other uses than packing, a web of flexible material, e.g. paper, may be laminated to one or both sides of the material, by apparatus comprising upper and lower endless canvas belts 422a, 422b, Fig. 3, passing between heatable metal pressing plates 401, 402, the faces of the honeycomb core being coated with adhesive, e.g. china clayloaded sodium silicate, by a roller 416b supplied from a bath 410 and by a pair of rollers 416a, 417a, between which a pool of adhesive is maintained at constant level from a supply pump. The core material may alternatively be faced with hardboard, plywood or material impregnated with melamines or other resin. To permit ventilation of the core material during hot processing notches may be cut in the unexpanded slices by circular saws in slots in the table 2, Fig. 1.