CN112092117A - Preparation method of crossed grid oriented light plate - Google Patents
Preparation method of crossed grid oriented light plate Download PDFInfo
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- CN112092117A CN112092117A CN202010887267.2A CN202010887267A CN112092117A CN 112092117 A CN112092117 A CN 112092117A CN 202010887267 A CN202010887267 A CN 202010887267A CN 112092117 A CN112092117 A CN 112092117A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/06—Manufacture of central layers; Form of central layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
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Abstract
The invention discloses a preparation method of a crossed grid oriented light plate, which comprises the following steps of (1) longitudinally cutting: cutting the eucalyptus veneer into veneer strips; (2) gluing: weighing an adhesive, a veneer strip and a modified adhesive, and coating the modified adhesive on the veneer strip; (3) paving: taking the whole eucalyptus veneer as a lower layer, arranging double-sided glued veneer on the lower layer in parallel from left to right at equal intervals to serve as a layer I, arranging double-sided glued veneer on the layer I in parallel from front to back at equal intervals to serve as a layer II, continuously arranging the veneer in a mutually vertical mode, taking a total layer of the veneer arranged in the mutually vertical mode as a middle layer, and finally placing the whole eucalyptus veneer on the middle layer to serve as an upper layer to obtain a plate blank; (4) and (5) hot pressing to obtain the crossed grid oriented lightweight board. According to the invention, the board with better density and mechanical property and meeting the requirements of the light board can be obtained by regulating and controlling the size of the gaps formed by the crossed arrangement of the single board strips, the number of layers of the single board strips, the hot pressing parameter and the thickness of the board.
Description
Technical Field
The invention relates to a preparation method of a light plate, in particular to a preparation method of a cross grid oriented light plate.
Background
The light plate is a plate which has lighter weight and strength meeting the use standard compared with the common plate. The light artificial board saves raw materials in manufacturing, the cost is relatively reduced, and the use price can be reduced, so that the light artificial board becomes a related trend. The reduction of the plate quality can bring much convenience to the transportation and assembly of consumers and wholesale retailers, and the reduction of the transportation cost is the view of supporters. However, despite the above advantages, manufacturers of light artificial boards are reluctant to change the original production process of the manufacturers. Moreover, because the artificial board is a new variety, the market acceptance of the artificial board is low, and a furniture retailer can not pay extra cost for a new product, so that the artificial board is difficult to be implemented on the light artificial board.
In recent years, many countries and regions face the difficult situation of wood resource shortage, the rising range of material cost is greatly improved, the phenomenon cannot be well improved in a short time, and the growth speed of the wood processing industry is reduced compared with the prior art. Many enterprises and public institutions comprehensively consider the problems of resources and cost, research and development of light artificial boards are started in many times, and the research and development of light artificial boards become a hot point problem gradually. Therefore, a new artificial board preparation process capable of improving the performance of the oriented lightweight board is needed, and a new artificial board with lighter mass and strength meeting the requirements is prepared, so that the physical and mechanical properties of the artificial board are optimized.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation method of a crossed grid oriented lightweight board, and aims to obtain a preparation method which is simple in preparation process, low in cost and good in mechanical property of the oriented lightweight board.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a preparation method of a cross grid oriented lightweight board comprises the following operation steps:
(1) longitudinal cutting: cutting the eucalyptus veneer into veneer strips, wherein the size of the veneer strips is 40cm-120cm in length, 1.0cm-3.0cm in width and 0.8cm-2.5mm in thickness;
(2) gluing: weighing an adhesive and the single board strip obtained in the step (1) according to a certain amount, modifying the adhesive, and uniformly smearing the modified adhesive on the two sides of the single board strip;
(3) paving: using the whole eucalyptus veneer as a lower layer, arranging the double-sided glued veneer in the step (2) on the lower layer from left to right in parallel at equal intervals to serve as a layer I, then arranging the double-sided glued veneer on the layer I from front to back in parallel at equal intervals to serve as a layer II, forming a cross grid structure by the layer I and the layer II, continuously arranging the veneer in a mutually perpendicular mode, wherein the equal distance is 1-5cm, arranging 9-15 layers (including the layer I and the layer II) in total, using a total layer of the veneer arranged in the mutually perpendicular mode as a middle layer, finally placing the whole eucalyptus veneer on the middle layer to serve as an upper layer to obtain a plate blank, and the thickness of the obtained plate blank is 10-15 mm;
(4) hot pressing: hot-pressing the slab blank obtained in the step (3) for 10-20min at the pressure of 1.0-2.0Mpa and the hot-pressing temperature of 120-;
wherein, when the width of the single batten in the step (1) is 2cm, the equidistant distance in the step (3) is 4cm, 12 layers are arranged, and the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 1cm, the equidistant distance in the step (3) is 2cm, 9 layers are arranged in common, and the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 3cm, 15 layers are arranged in the step (3) in a row at equal intervals of 3cm, and the thickness of the obtained plate blank is 12 mm;
wherein, when the width of the single battens in the step (1) is 2cm, the equidistant distance in the step (3) is 4cm, 9 layers are arranged in common, and the thickness of the obtained plate blank is 12 mm;
when the width of the single battens in the step (1) is 2cm, 15 layers are arranged in the step (3) in a row at equal intervals of 3cm, and the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 3cm, arranging 12 layers with the equal distance of 4cm in the step (3), wherein the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 3cm, the equal distance in the step (3) is 2cm, 15 layers are arranged in total, and the thickness of the obtained plate blank is 12 mm.
Preferably, the width of the veneer strip in the step (1) is 2.0 cm.
Preferably, in step (2), the adhesive and the veneer are taken in a mass ratio of 0.15:1 of adhesive to the veneer obtained in step (1).
Preferably, a flour modified adhesive is added in the step (2), wherein the flour is strong flour, the addition amount of the flour is 25% of the mass of the adhesive, and the glue application amount is 15% of the mass of the veneer strips; the adhesive is urea formaldehyde adhesive.
Preferably, the pressure maintaining time in the step (4) is 15min, the pressure is 1.5MPa, and the hot pressing temperature is 125 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of cutting a eucalyptus veneer into single-board strips with fixed width, coating glue on two sides of the single-board strips, arranging the single-board strips in a crossed mode to form a middle layer of the board, and simultaneously performing hot pressing on the upper layer composite eucalyptus veneer and the lower layer composite eucalyptus veneer to form a light board with a gap structure, so that a crossed grid oriented light board is obtained; according to the invention, the board which has better density and mechanical property and meets the requirements of the light board can be obtained by regulating and controlling the size of the gaps formed by the cross arrangement of the single board strips, the number of layers of the single board strips, the hot pressing parameter and the thickness of the board, and the board has a stronger application prospect.
Drawings
FIG. 1 is a process schematic of the process of the present invention.
FIG. 2 is a slab test piece obtained by the method of the present invention.
FIG. 3 is a graph showing the effect of various factors on the density of cross-grid oriented lightweight boards prepared by the method of the present invention.
FIG. 4 is a graph showing the effect of various factors on the elastic modulus of cross-grid oriented lightweight boards prepared by the method of the present invention.
FIG. 5 shows the influence of different factors on the static bending strength of the cross-grid oriented lightweight board prepared by the method of the invention.
FIG. 6 shows the effect of different factors on the internal bond strength of the cross-grid oriented lightweight board prepared by the method of the present invention.
FIG. 7 shows the influence of different factors on the water absorption expansion rate of the cross-grid oriented lightweight board prepared by the method of the invention.
Detailed Description
The following detailed description is to be read in connection with the accompanying drawings, but it is to be understood that the scope of the invention is not limited to the specific embodiments. The raw materials used in the examples were all commercially available unless otherwise specified.
Example 1
A preparation method of a cross grid oriented lightweight board comprises the following operation steps:
(1) longitudinal cutting: cutting the eucalyptus veneer into a veneer strip by using a precision sliding table saw, wherein the size of the veneer strip is 42cm in length, 1.0cm in width and 1mm in thickness;
(2) gluing: weighing the veneer strips and the urea-formaldehyde adhesive according to the mass ratio of 1:0.15 of the veneer strips and the urea-formaldehyde adhesive obtained in the step (1), adding a high-gluten flour modified urea-formaldehyde adhesive accounting for 25% of the mass of the urea-formaldehyde adhesive, pouring the modified urea-formaldehyde adhesive into a manual glue rolling machine, regularly paving the veneer strips obtained in the step (1) in batches in a tray, lightly rolling the paved veneer strips by using a glue rolling machine to uniformly coat the adhesive on the two surfaces of the veneer strips, wherein the glue application amount is 15% of the mass of the modified urea-formaldehyde adhesive;
(3) paving: using the whole eucalyptus veneer as a lower layer, arranging the double-sided glued veneer on the lower layer in the step (2) from left to right in parallel at equal intervals, wherein the distance between the veneer is 2cm, the single veneer is used as a layer I, arranging the double-sided glued veneer on the layer I from front to back in parallel at equal intervals, the distance between the veneer is 2cm, the single veneer is used as a layer II, the layer I and the layer II form a cross grid structure, continuously arranging the veneer in a mutually vertical mode, arranging 9 layers (including the layer I and the layer II) in total, taking the total layer of the veneer arranged in a mutually vertical mode as a middle layer, and finally placing the whole eucalyptus veneer on the middle layer to be used as an upper layer to obtain a plate blank, wherein the thickness of the obtained plate blank is 10mm, and the specification size of the upper layer and the lower layer is 42 cm;
(4) hot pressing: and (4) putting the plate blank obtained in the step (3) into a hot press for experiment for hot pressing to obtain a plate blank with the thickness of 10mm, keeping the pressure for 15min, keeping the pressure at 1.5Mpa, and keeping the hot pressing temperature at 125 ℃, thus obtaining the cross grid oriented light plate.
Aging the plate blank: and (4) taking out the obtained plate blank after hot pressing is finished in the step (4), and standing for 5 days for detection.
Example 2
A preparation method of a cross grid oriented lightweight board comprises the following operation steps:
(1) longitudinal cutting: cutting the eucalyptus veneer into a veneer strip by using a precision sliding table saw, wherein the size of the veneer strip is 40cm in length, 3.0cm in width and 0.8mm in thickness;
(2) gluing: weighing the veneer strips and the urea-formaldehyde adhesive according to the mass ratio of 1:0.15 of the veneer strips and the urea-formaldehyde adhesive obtained in the step (1), adding a high-gluten flour modified urea-formaldehyde adhesive accounting for 25% of the mass of the urea-formaldehyde adhesive, pouring the modified urea-formaldehyde adhesive into a manual glue rolling machine, regularly spreading the veneer strips obtained in the step (1) in batches in a tray, slightly grinding the spread veneer strips by using a glue rolling machine, uniformly coating the urea-formaldehyde adhesive on the two sides of the veneer strips, wherein the glue application amount is 15% of the mass of the modified urea-formaldehyde adhesive;
(3) paving: using the whole eucalyptus veneer as a lower layer, arranging the double-sided glued veneer in the step (2) on the lower layer in parallel from left to right at equal intervals, wherein the distance between the veneer is 3cm, the single veneer is used as a layer I, then arranging the double-sided glued veneer on the layer I from front to back at equal intervals, the distance between the veneer is 3cm, the single veneer is used as a layer II, the layer I and the layer II form a cross grid structure, continuously arranging the veneer in a mutually vertical mode, arranging 15 layers (including the layer I and the layer II) in total, taking the total layer of the veneer arranged in a mutually vertical mode as a middle layer, and finally placing the whole eucalyptus veneer on the middle layer to be used as an upper layer to obtain a plate blank, wherein the thickness of the obtained plate blank is 12mm, and the specification size of the upper layer and the lower layer is 42cm multiplied;
(4) hot pressing: and (4) putting the plate blank obtained in the step (3) into a hot press for experiment for hot pressing to obtain a 12mm plate blank, and keeping the pressure for 10min, the pressure being 1.0Mpa and the hot pressing temperature being 150 ℃ to obtain the cross grid oriented light plate.
Aging the plate blank: and (4) taking out the obtained plate blank after hot pressing is finished in the step (4), and standing for 3 days for detection.
Example 3
A preparation method of a cross grid oriented lightweight board comprises the following specific operation steps:
(1) longitudinal cutting: cutting the eucalyptus veneer into a veneer strip by using a precision sliding table saw, wherein the size of the veneer strip is 120cm in length, 2.0cm in width and 2.5mm in thickness;
(2) gluing: weighing the veneer strips and the urea-formaldehyde adhesive according to the mass ratio of 1:0.15 of the veneer strips and the urea-formaldehyde adhesive obtained in the step (1), adding a high-gluten flour modified urea-formaldehyde adhesive accounting for 25% of the mass of the urea-formaldehyde adhesive, pouring the modified urea-formaldehyde adhesive into a manual glue rolling machine, regularly paving the veneer strips obtained in the step (1) in batches in a tray, slightly grinding the paved veneer strips by using a glue rolling machine, and uniformly coating the urea-formaldehyde adhesive on the veneer strips, wherein the glue application amount is 15% of the mass of the modified urea-formaldehyde adhesive;
(3) paving: using the whole eucalyptus veneer as a lower layer, arranging the double-sided glued veneer in the step (2) on the lower layer in parallel from left to right at equal intervals, wherein the distance between the veneer is 4cm and is used as a layer I, then arranging the double-sided glued veneer on the layer I from front to back at equal intervals, wherein the distance between the veneer is 4cm and is used as a layer II, the layer I and the layer II form a cross grid structure, continuously arranging the veneer in a mutually vertical mode, arranging 12 layers (including the layer I and the layer II) in total, taking the total layer of the veneer arranged in a mutually vertical mode as a middle layer, and finally placing the whole eucalyptus veneer on the middle layer to be used as an upper layer to obtain a plate blank, wherein the thickness of the obtained plate blank is 10mm, and the specification size of the upper layer and the lower layer is 42cm multiplied by 42 cm;
(4) hot pressing: and (4) putting the plate blank obtained in the step (3) into a hot press for experiment for hot pressing to obtain a plate blank with the thickness of 10mm, keeping the pressure for 15min, keeping the pressure at 1.5Mpa, and keeping the hot pressing temperature at 125 ℃, thus obtaining the cross grid oriented light plate.
Aging the plate blank: and (4) taking out the obtained plate blank after the hot pressing in the step (4) is finished, and standing for 2-5 days for detection.
Example 4
A preparation method of a cross grid oriented lightweight board comprises the following specific operation steps:
(1) longitudinal cutting: cutting the eucalyptus veneer into a veneer strip by using a precision sliding table saw, wherein the size of the veneer strip is 120cm in length, 2.0cm in width and 2.5mm in thickness;
(2) gluing: weighing the veneer strips and the urea-formaldehyde adhesive according to the mass ratio of 1:0.15 of the veneer strips and the urea-formaldehyde adhesive obtained in the step (1), adding a high-gluten flour modified urea-formaldehyde adhesive accounting for 25% of the mass of the urea-formaldehyde adhesive, pouring the modified urea-formaldehyde adhesive into a manual glue rolling machine, regularly paving the veneer strips obtained in the step (1) in batches in a tray, slightly grinding the paved veneer strips by using a glue rolling machine, and uniformly coating the urea-formaldehyde adhesive on the veneer strips, wherein the glue application amount is 15% of the mass of the modified urea-formaldehyde adhesive;
(3) paving: using the whole eucalyptus veneer as a lower layer, arranging the double-sided glued veneer in the step (2) on the lower layer in parallel from left to right at equal intervals, wherein the distance between the veneer is 4cm and is used as a layer I, arranging the double-sided glued veneer on the layer I from front to back at equal intervals, wherein the distance between the veneer is 4cm and is used as a layer II, forming a cross grid structure on the layer I and the layer II, continuously arranging the veneer in a mutually vertical mode, arranging 9 layers (including the layer I and the layer II) in total, using the total layer of the veneer arranged in a mutually vertical mode as a middle layer, and finally placing the whole eucalyptus veneer on the middle layer as an upper layer to obtain a plate blank, wherein the thickness of the obtained plate blank is 12mm, and the specification size of the upper layer and the lower layer is 42cm multiplied by 42 cm;
(4) hot pressing: and (4) putting the plate blank obtained in the step (3) into a hot press for experiment for hot pressing to obtain a plate blank with the thickness of 10mm, keeping the pressure for 15min, keeping the pressure at 1.5Mpa, and keeping the hot pressing temperature at 125 ℃, thus obtaining the cross grid oriented light plate.
Aging the plate blank: and (4) taking out the obtained plate blank after the hot pressing in the step (4) is finished, and standing for 2-5 days for detection. And (3) detection:
oriented lightweight boards (example 1 is numbered 1 in table 1) were produced in exactly the same manner as in example 1, with the parameters adjusted according to the respective data in table 1, according to the production method of example 1.
TABLE 1
The static bending strength, elastic modulus, internal bonding strength, density and water absorption thickness expansion rate of the prepared oriented lightweight board are detected, and the results are shown in table 2 (the number 1 in table 2 is the data obtained in example 1, the factor data is more, the physical and mechanical properties of the boards obtained in examples 2-4 all meet the requirements of LY/T1580-2010 oriented strand board on OSB/1 type, and the data of examples 2-4 are not included in table 2), the data obtained in table 2 are subjected to extreme difference analysis, and a graph in a figure 3-7 is obtained:
TABLE 2
Figure 3 shows a comparison of the density of the cross-grid oriented lightweight panels in the above 9 experiments: wherein, the experimental serial numbers 1, 6 and 8 are cross grid oriented light plates with the thickness of 10 mm; the test numbers 4 and 9 are plates with the thickness of 12mm, the test numbers 3, 5 and 7 are plates with the thickness of 15mm, and as is obvious from the upper figure 3, the plates with the thickness of 15mm have the minimum density and the lightest weight; the next is a 12mm sheet, the highest density is a 10mm thick sheet. It can be preliminarily derived that: the smaller the thickness of the sheet, the tighter the compression of the veneer, and the greater the density. On the other hand, the more the number of layers of the veneer strips is, and the smaller the veneer thickness is, the tighter the veneer strips are attached to each other, the greater the density is, the smaller the spacing of the veneer strips is, and the density is reduced along with the spacing.
FIG. 4 shows that the elastic modulus increases with the increase of the width of the veneer, and decreases first and then increases within the range of the number of layers of the veneer, and the elastic modulus of the sheets with 9 layers and 12 layers is not very different, which may be caused by the fact that the number of layers of the veneer in the experimental group indirectly affects the elastic modulus; the elastic modulus decreases with the increase of the thickness of the plate and the interval of the single laths, and the analysis reason is that the wider the single laths, the smaller the gap left in the plate, the higher the elastic modulus, the thicker the plate, and the less the single laths are pressed tightly to cause the decrease of the elastic modulus; the larger the spacing of the slats, the larger the voids in the panel and the corresponding decrease in modulus of elasticity.
Fig. 5 shows that the static bending strength increases with the increase of the width of the veneer, and it is likely that the width of the veneer indirectly affects the size of the internal gap of the plate, and the increase of the number of layers of the veneer firstly shows a descending trend from 18.57 to 28.61 and then rises. Static bending strength descends and then rises along with the increase of the single-board strip interval, and when the single-board strip interval is 2cm, the static bending strength reaches 26.87: the static bending strength is decreased along with the increase of the thickness of the plate, and the analysis reason is probably that the single lath in the plate is not compacted and is not tightly attached, so that the static bending strength is reduced. According to the mechanical property requirements of the non-bearing plate in a dry state in standard LY/T1580-2010 oriented strand board Standard, the static bending strength of the plate with the thickness of 6-10mm is greater than 22, the static bending strength of the plate with the thickness of 10-18mm is greater than 20, and the plates obtained by the numbers 2-5 and 7 do not reach the standard.
FIG. 6 shows that the internal bond strength is only 0.23 at the lowest at a 3cm width of the veneer strip, and increases with increasing width in the range of 1-2cm, which may be analytically due to the fact that the internal bond strength is related to the contact area of the material in the panel, but 3cm is the lowest, which may be due to uneven sizing during the experiment; the internal bonding strength is gradually reduced along with the increase of the number of the layers of the single laths, and the analysis reason is that the thickness of the single laths is increased due to the increase of the number of the layers of the single laths and the thickness of the single laths is regulated, so that the heat of the plate is not sufficiently transferred to the whole plate in the hot pressing process, and the internal bonding strength is reduced; the internal bonding strength is increased and decreased in the thickness range of the plate, and the analysis reason is that when the thickness of the plate is 15mm, the number of layers of some single laths is barely greater than the size of a thickness gauge, and the single laths are not fully compressed during hot pressing, so that the internal bonding strength is reduced; the internal bonding strength is reduced firstly and then increased within the interval range of the veneer strips, is the lowest at the interval of 2cm and is only 0.61MPa, and the analysis reason is probably that the size of the test piece is small, and only a small part of the veneer strips are contained when the test piece is cut, so the internal bonding strength is very small.
Fig. 7 shows that the water absorption thickness expansion rate increases with increasing number of layers of the veneer, steadily increasing from 74% to 92% in 9 layers, increasing first and then decreasing in both the veneer width and the veneer spacing factors, with the highest values of 114% and 103% occurring at 2cm veneer width and 3cm veneer spacing. The water-absorbing thickness expansion ratio of the sheet thickness is decreased from the maximum to the minimum and then increased. The 24-hour water absorption thickness expansion rate of the plate within the thickness range of 10 mm-18 mm specified in LY/T1580-2010 standard is more than 15%, and the light plate under all conditions reaches the standard. The water absorption thickness expansion rate is far beyond the standard, and the analysis reason may be that the single board strip is not glued evenly and the hot pressing time is short after the number of layers of the board is too much in the hot pressing process, so that the heat is not transferred thoroughly, and the single board strips are not fixed with enough bonding strength, so that the board expansion is serious and the deformation is serious.
The experimental results show that: the main factors influencing the eucalyptus veneer interlaced lightweight board are the width of the veneer and the number of layers of the veneer, and the spacing of the veneer is the second factor.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. A preparation method of a cross grid oriented lightweight board is characterized by comprising the following operation steps:
(1) longitudinal cutting: cutting the eucalyptus veneer into veneer strips, wherein the size of the veneer strips is 40cm-120cm in length, 1.0cm-3.0cm in width and 0.8cm-2.5mm in thickness;
(2) gluing: weighing an adhesive and the single board strips obtained in the step (1) according to a certain amount, modifying the adhesive, and coating the modified adhesive on two sides of the single board strips;
(3) paving: using the whole eucalyptus veneer as a lower layer, arranging the double-sided glued veneer in the step (2) on the lower layer in parallel from left to right at equal intervals to serve as a layer I, then arranging the double-sided glued veneer in parallel from front to back at equal intervals on the layer I to serve as a layer II, continuously arranging the veneer in a mutually perpendicular mode, wherein the equal intervals are 1-5cm, arranging 9-15 layers in total, using the total layer of the veneer arranged in the mutually perpendicular mode as a middle layer, and finally placing the whole eucalyptus veneer on the middle layer to serve as an upper layer to obtain a plate blank, wherein the thickness of the obtained plate blank is 10-15 mm;
(4) hot pressing: hot-pressing the slab blank obtained in the step (3) for 10-20min at the pressure of 1.0-2.0Mpa and the hot-pressing temperature of 120-;
wherein, when the width of the single batten in the step (1) is 2cm, the equidistant distance in the step (3) is 4cm, 12 layers are arranged, and the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 1cm, the equidistant distance in the step (3) is 2cm, 9 layers are arranged in common, and the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 3cm, 15 layers are arranged in the step (3) in a row at equal intervals of 3cm, and the thickness of the obtained plate blank is 12 mm;
wherein, when the width of the single battens in the step (1) is 2cm, the equidistant distance in the step (3) is 4cm, 9 layers are arranged in common, and the thickness of the obtained plate blank is 12 mm;
when the width of the single battens in the step (1) is 2cm, 15 layers are arranged in the step (3) in a row at equal intervals of 3cm, and the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 3cm, arranging 12 layers with the equal distance of 4cm in the step (3), wherein the thickness of the obtained plate blank is 10 mm;
when the width of the single battens in the step (1) is 3cm, the equal distance in the step (3) is 2cm, 15 layers are arranged in total, and the thickness of the obtained plate blank is 12 mm.
2. The method of claim 1, wherein: the width of the veneer strip in the step (1) is 2.0 cm.
3. The method of claim 1, wherein: in the step (2), the adhesive and the veneer are taken according to the mass ratio of 0.15:1 of the adhesive to the veneer obtained in the step (1).
4. The method of claim 1, wherein: adding a flour modified adhesive in the step (2), wherein the flour is high gluten flour, the addition amount is 25% of the mass of the adhesive, and the glue application amount is 15% of the mass of the veneer strips; the adhesive is urea formaldehyde adhesive.
5. The method of claim 1, wherein: and (4) keeping the pressure for 15min, wherein the pressure is 1.5Mpa, and the hot pressing temperature is 125 ℃.
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| CN202010887267.2A CN112092117B (en) | 2020-08-28 | 2020-08-28 | Preparation method of crossed grid oriented light plate |
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| CN202010887267.2A CN112092117B (en) | 2020-08-28 | 2020-08-28 | Preparation method of crossed grid oriented light plate |
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