REINFORCED COMPOSITE CONTAINER FLOORING WITH RESIN-IMPREGNATED VENEERS AND METHOD OF MANUFACTURE
The invention includes reinforced composite container flooring with resin-impregnated veneers, a core layer which may be formed from a structural stone-based panel or a multi-layer wood veneer panel, and its manufacturing processes.
1 . A container flooring comprising a core layer and symmetrical surface layers on both surfaces of the core panel each comprising a resin-impregnated wood veneer layer.
2 . The container flooring of claim 1 wherein the resin-impregnated wood veneer layer comprises poplar, pine, eucalyptus, spruce or fir wood.
3 . The container flooring of claim 1 wherein the surface layers each comprise, in sequence from inside toward outside, at least one layer of perpendicular-grained phenol-formaldehyde resin-impregnated wooden veneer, and at least 2 layers of parallel-grained resin-impregnated wooden veneers.
4 . The container flooring of claim 1 wherein the resin-impregnated wooden veneers have been dried under low temperature.
5 . The container flooring of claim 1 wherein the core layer comprises a structural strand-based panel or a multi-layer wood veneer panel.
6 . The container flooring of claim 5 wherein the core layer comprises multiple layers of parallel-grained and perpendicular-grained veneers assembled in accordance with layout requirements of container flooring to form the core layer.
7 . The container flooring of claim 6 wherein the core layer comprises 11 to 13 layers of parallel-grained and perpendicular-grained veneers.
8 . The container flooring of claim 1 wherein each surface layer further comprises an outer hardwood veneer layer.
9 . The container flooring of claim 1 wherein each surface layer further comprises an outer layer of resin-impregnated paper as the outermost surface layer.
10 . The container flooring of claim 1 wherein each surface layer farther comprises a layer of resin-impregnated bamboo curtain sheet or woven-mat sheet.
11 . A method of manufacturing a container flooring comprising a core layer and surface layers on both surfaces of the core panel each comprising a resin-impregnated wood veneer layer, comprising the step of impregnating the wood veneer with a resin, symmetrically assemble the surface layers with the core layer to form a mat; consolidate the assembled mat by hot-pressing; gradually reducing the press pressure in steps for degassing and relieving the press pressure.
12 . The method of claim 11 wherein the surface layers further comprises a resin-impregnated paper or a resin-impregnated bamboo layer, comprising the step of impregnating the paper or bamboo layer with a resin.
13 . The method of claim 11 comprising the steps of: drying the wood veneer to a moisture content of less than about 12%, spread resin on both sides with the spread rate of 250 to 350 g/m 2 (resin solid content is 40% to 50%); impregnate the wood veneer with resin with the resin retention rate of 15% to 50% and then are conditioned or dried under low temperature.
14 . The method of claim 12 comprising the steps of: drying the bamboo layer to a moisture content of less than about 12%, diluting the resin to a solid content of 30% to 36%, impregnating the bamboo with resin under the normal pressure with the resin retention of 7% to 10%.
15 . The method of claim 11 comprising the hot-pressing conditions comprise a press temperature from 125 to 150° C. and press pressure from 2.0 to 4.0 MPa for 5 to 10 minutes.
16 . The method of claim 11 wherein the resin impregnation step comprises a direct pressurized treatment; a vacuum and pressurized treatment; a pressurized, vacuum and pressurised treatment; or a combination of repeat vacuum and pressurized treatments to induce the resin to penetrate into cell lumens and cell walls of the veneers.
17 . The method of claim 11 wherein the core layer comprises a strand layer and is pre-pressed prior to mat consolidation.