CN1197876A - Deformation preventing method for three-layered glued wood floor - Google Patents

Abstract

The three-layered wood floor has spliced surface layer of hard wood, transverse core layer of soft wood and bottom layer of hard wood board. The core layer with glued two furfaces is crisscross superposed with surface layer and bottom layer and through hot pressing and subsequent process, the product is obtained. The present invention has spliced bottom layer with cutting gap, hole and inclined indentation to prevent deformation so that the bottom layer has only local, rather than global, expansion and contraction and the floor board has less deformation.

Description

Prevent the method for three-layered glued wood floor distortion

The present invention relates to a kind of floor of adopting three-layered glued wood in the wood-processing industry.

Present existing three-layered glued wood floor (the title solid wooden compound floor that also has) overlaps anyhow to glue together by wood surface plate, sandwich layer, base plate and forms, the top layer adopts high-quality hardwood to be processed into 3～5 millimeters thick, 40～80 mm wides, long 180～500 millimeters thin slice splicing becomes 0.9～2.2 meter long surface plate, sandwich layer to adopt common middle softwood such as pine, China fir, poplar to be processed into 2～5 centimetres wide, the horizontal assembly of core bar of 9 millimeters thick, base plate adopts rotary-cut or sliced veneer, about 2～2.4 millimeters of thickness, length and width and panel match.Factory generally all will deposit raw material drying, calms down modifiedly to come into operation with the control product quality after waiting measure again.Will be behind the central layer double spread and the combination of surface plate base plate, through hot pressing, saw limit, mortice opening, sanding, japanning product, each factory of the specification of product is slightly variant, does not have unified dimensions, and is big to long 0.9～2.2 meter, wide 120～210 millimeters, thick 14～15 millimeters.

Because product surface plate, sandwich layer are non-whole changes, no matter how high machining accuracy is, minim gap is all arranged, and base plate except that since the material defective have a spot of assembly mends by replacing a damaged part, on direction in length and breadth all is the thin plate of whole change, and table, core, the end are incomplete symmetrical structures for three layers, add the material difference, therefore under all normal situation of every process conditions such as moisture content, hot pressing time, hot pressing pressure, hot pressing temperature, still have 10～30% distortion.Although it is attractive in appearance that some distortion in filling the scope of being permitted, influences,, put the back on market because the distortion that various places humidity difference also will produce some even when factory, be qualified products.Be out of shape contraction, the expansion that its main cause is a base plate through experimental analysis and cause that it shows as direction arching in length and breadth, wherein the overwhelming majority is vertical arching, and other distortion generally can be ignored.Panel, sandwich layer stretch can be by own peculiar combination, and the slit absorbs.And the vertical integral telescopic amount of base plate is during greater than 0.1 millimeter, and the vertical arching of product will be above 10 millimeters.

The factory that has adopts speed to give birth to softwood specially such as the poplar class is done base plate, and the dynamics that the softwood distortion causes is little, often can be by table, a core balance part, but can not eradicate.The product distortion can not guarantee fully that still because the glue performance of poplar own is not so good as watch core material and other weedtree, the product bulk strength is not high.Hardwood is done base plate in the employing, product glue performance and bulk strength height, but deformation rate is bigger.The producer that has even multilayer gluing structure on probation or bottom gluing etc., but because of increasing the difficulty of cost and production technology, attenuate the hard material thickness in top layer, market is difficult to accept, therefore not extensive the use.

The purpose of this invention is to provide a kind of simple method, make existing three-layered glued wood floor, promptly use various materials to do base plate, the Deformation control that also can make product is in filling the scope of being permitted.

The present invention carries out modification to base plate and handles under the complete constant situation of original production three-layer wood composite flooring production technology, and it is local flexible to make original base plate become by temperature, humidity effect integral telescopic, solves the purpose that product is out of shape thereby reach.

In technical scheme of the present invention, whole change of base plate is modified as approximate non-whole changes base plate, have for overcoming cutter crack, round, the impression base plate of product distortion, become to have above together tiltedly cutter crack, oblique round, multiple tracks several modes of trace of baroclining by artificial or mechanical simple process, they all are inclined cross many reel bars of sandwich layer, owing to intersect greater than miter angle, be inclined cross about 8 above reel bars, so behind gummed, can not influence the bulk strength of product with reel bar piece.Its cutter crack and round, barocline trace with whole change of original base plate change over minim gap, round, the approximate non-integralization of the trace that baroclines opens base plate.

Owing to had cutter crack, round, the trace that baroclines etc. to make base plate be subjected to the distortion of humidity effect generation integral telescopic, change into local micro-strain, and local micro-strain met the requirements all on observing and in the actual measurement.Actual effect keeps the indeformable of entire product.Only need use base plate is got final product along the vertical standardized cutter of center line crack if overcome cupping distortion with quadrat method.Under the guaranteed situation of former technological parameter, gluing hot pressing again can be controlled at below 0.3% in three-layered glued wood floor longitudinal strains long with 2.2 meters, 189 mm wides through such unlike material base plate of handling, and promptly sagitta is no more than 7 millimeters.

The invention will be further described below in conjunction with the drawings and specific embodiments.

Fig. 1 is the three-layered glued wood floor expanded view;

Fig. 2 adopts cutter crack instance graph;

Fig. 3 adopts the round instance graph;

Fig. 4 adopts the impression instance graph.

1 is surface plate in Fig. 1, the 2nd, and sandwich layer, the 3rd, base plate.Guarantee that in processing technology panel abutted seam and central layer splicing seams are strict dislocation from the visible three-layered glued wood floor of Fig. 1, can not overlap in same position influence intensity, is not to be that small pieces splice but whole change and base plate is different with the watch core layer.

1 and 2 is that base plate is marked oblique cutter crack one to twice with common cutter with blade among Fig. 2.3 is to take not draw disconnected palette knife crack to streak center line among Fig. 2, mark the cutter crack after, stick adhesive tape at not gluing face and connect, be convenient to base plate and carry and prevent to come off.That the dilatation of base plate is resolved into is local rather than whole in the cutter crack among Fig. 2, and this local micro-strain can be controlled in the claimed range.Fig. 3 is identical with Fig. 2 with its effect of inclined hole crack of round extrusion, although the plate face is not scratched, but staggered hole has made base plate also become local distortion by integral telescopic, round can form with the pressurization of row's dolly set tool, oblique round crack can be become among product producer trade mark printed words such as Fig. 32 for attractive in appearance.Fig. 4 adopts mould to be contained on the press to extrude many traces that barocline in advance with bigger pressure, and oblique line is an impression, and the trace that baroclines partly becomes very tight, and the former whole uniform structure destroyed of timber has weakened flexible amplitude to a certain extent.

Ordinary circumstance declivity cutter crack, oblique round only need one to twice get final product.

From implementing complexity and intensity, adopt oblique cutter crack best, do not increase cost, easy and simple to handle, need not special equipment, the general operation workman is as long as simple declaration gets final product work after requiring.On the oblique cutter of base plate crack, oblique round, stick the adhesive tape that is printed on emblem mark, can play decoration function, and can be local moistureproof.

Claims (3)

1, the floor that forms by three-layered glued wood, its wood surface plate is processed into the splicing of certain specification thin slice by high-quality hardwood and forms, the horizontal assembly of core bar that softwood was processed into certain specification during sandwich layer adopted, base plate adopts the thin plate of various weedtree rotary-cuts or slicing, behind the sandwich layer double spread with surface plate, base plate overlapping combination in length and breadth, become the floor through hot-press gluing, it is characterized in that: whole change of base plate is modified as approximate non-whole change, has to be the barocline base plate of trace of cutter crack, the round that overcomes the product distortion.Cutter crack, round all are inclined cross many core bars in the floor, and the graduation of cutter crack is broken and do not drawn two kinds of disconnected base plates.

2, form by font according to its base plate round of claim 1 described three-layered glued wood floor.

3, stick the adhesive tape decoration that can be printed on font according to claim 1 described three-layered glued wood floor cutter crack and round.

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