BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1: a structural schematic diagram for the existing two kinds of bamboo block floors.
FIG. 2: the principle schematic diagram for compressing the existing bamboo filament slab floor.
FIG. 3: a block diagram of production process of embodiment 1 for the present invention.
FIG. 4: the principle schematic diagram for opposite directional hot pressing.
FIG. 5: a block diagram of production process of embodiment 2 for the present invention.
In all figures: 1. mould; 2. bamboo filament; 3. molding board.
DETAILED DESCRIPTION OF THE INVENTION
To combine the drawings and the embodiments, the further description for the present invention will be exhibited hereinafter:
FIG. 1 exhibits the structure of existing ordinary bamboo block slab floor, wherein A displays strip structure overlapped and veneered with several layers by bamboo block of rectangle cross section paved horizontally, and B displays strip structure veneered by bamboo block of rectangle cross section paved longitudinally. The bamboo block floor made according to aforesaid process has high demand for selecting materials; the availability of bamboo timber is low and waste is high; organic matter in bamboo block is not fully removed, which will cause the occurrence of mildewing or rotting and shorten the service life; the differences between bamboo blocks will result in flexible deformation, insufficient hardness and weak resistance to abrasion.
FIG. 2 exhibits the compressing process to make the existing bamboo filament slab floor, namely, at normal temperature under cold pressing without heating, vertically pressurizing bamboo filament 2 in upper and lower two directions while compressing, wherein there is no pressure around bamboo filament, mould 1 fixed only by depending on the side faces itself is used as boundary to limit the moving of bamboo filament 2 and to help to shape, holes and gaps are easy to occur inside bamboo filament floor made by aforesaid process; the slab made by compressing at normal temperature has instable quality, while pressure come from outside is removed, rebound and expansion are easy to take place again, thus the quality of floor should be influenced. The embodiment 1 for the present invention as shown in FIG. 3 is a process for making a bamboo filament floor by opposite directional hot pressing, wherein the procedures are as follows:
a. selecting materials, there is no special demand for the thickness of bamboo timber, the top and lop and root of bamboo can also be fully used;
b. splitting and sawing, according to the needed length of bamboo fiber, the selected moso bamboo is rolling pressed and hacked into bamboo sheet with suitable length;
c. removing the outer and inner surface layers, i.e., removing the outer and inner surface layers of bamboo sheet;
d. shredding bamboo sheet as bamboo filaments, by rolling press or cleaving by a cutter, bamboo sheet is shredded into bamboo filament;
e. directly stewing (i.e. anti-corrosion treatment), by removing organic matter contained in bamboo filament such as sugar, protein, etc. to avoid the occurrence of mildewing and even rotting, the bamboo filament made is bamboo filament with natural color.
f. primary drying, water content is limited to 7%;
g. sizing treatment, bamboo filaments are bound in heaps and then fully soaked into glue pool by water-resistant glue, wherein the major components include phenol glue, epoxy glue, melamine, isocyanate and caustic soda, glue content is limited to 15%, bamboo filaments are soaked for 30 minutes and then fished out and drained until fully dry;
h. secondary drying, sized bamboo filament is dried and water content is limited to 10%;
i. molding bamboo filament, bamboo filament is paved in a crisscross pattern with several layers into the molding boards, the upper and lower and side faces of which can horizontally move, to wait for pressurizing treatment, if only the quality of the added bamboo filament compressed each time is the same as the space formed by the moving of molding boards, the consistency of the density and specification of slab can be insured;
j. compressing, said compressing is opposite directional hot pressing, including positive pressing on upper and lower opposite faces and side pressing on left and right opposite faces, wherein said positive pressure on upper and lower opposite faces should be 50 MPa, side pressure should be 20 MPa, the temperature should be 130° C. and hot-press time should be 30 minutes. After finishing hot pressing, holdup pressure is kept the same, after cooling for 5 minutes, pressure relief should then be implemented;
k. balancing, formed bamboo filament slab is stored in dry natural environment indoors for five to ten days or more. The purpose is to remove remaining stress, and to make water content even distributing in the filament slab
FIG. 4 exhibits the principle of opposite directional hot pressing for the present invention. Bamboo filament 2 is paved in moulding board 3 positioned in the upper, lower, left and right four sideboards around bamboo filament. In inner cavity of said moulding boards, steam and cooling water pipes are installed (not shown in figure). By machine drive while compressing, upper and lower vertical moulding boards and left and right horizontal moulding boards all move inwards. Bamboo filament 2 is compressed, then heating and cooling can be realized by depending on steam and cooling water pipes in inner cavity of said moulding boards, and the moulding boards should be withdrawn and repositioned after finishing compressing.
The embodiment 2 for the present invention as shown in FIG. 5 is different with embodiment 1. The difference is that anti-corrosion treatment should be wet carbonizing treatment, namely, natural bamboo filament with natural moisture is carbonized directly to make bamboo filament have carbonizing color. The bamboo filament slab made at last should be carbonizing color. The rest parts are all the same as embodiment 1.
Patent Application
20080053570
