Flexible solid wood composite board and preparation method thereof

Abstract

The invention relates to the technical field of decorative boards, in particular to a flexible bendable and twistable solid wood composite board and a preparation method thereof.The flexible bendable and twistable solid wood composite board comprises a base board and a surface board covering the upper surface of the base board and connected with the base board in a bonded mode, the lower surface of the base board is provided with a back groove grid, the back groove grid is composed of a plurality of back grooves, and the back grooves are formed in the surface of the base board. And the depth of the back groove is 0-0.5 mm smaller than the thickness of the substrate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of decorative panels, in particular to a flexible and bendable and twistable solid wood composite panel; the present application also relates to a preparation method of the flexible solid wood composite panel. BACKGROUND

[0002] The solid wood composite panel is a kind of decorative panel, which is prepared by laminating at least two layers of panels. According to design requirements, the multiple panel layers can be of the same wood species or different wood species. For example, the surface plate of a solid wood composite panel is a hard broadleaf wood veneer, and the base plate is a composite base plate composed of low-grade veneers.

[0003] Generally speaking, the greater the thickness of the solid wood composite panel, the less likely it is to warp or tile deform due to changes in the moisture content of the panel or external forces. However, the manufacturing cost is relatively high. Conversely, the smaller the thickness, the more likely it is to deform due to changes in moisture content or external forces, but the manufacturing cost is correspondingly reduced. This raises the requirement for producing solid wood composite panels with smaller thickness from the perspective of improving quality and reducing cost.

[0004] On the other hand, in some paving occasions, such as the renovation of old and dilapidated houses, there are existing paving materials in the ground or wall areas. If a floor or wall panel with a larger thickness is paved on this basis, it will reduce the already small indoor space, and the door height is also insufficient. At the same time, the existing decorative materials paved on the floor or wall area are used as the paving basis, but this basis may not be flat, and it may be time-consuming and laborious to correct its flatness using existing technical means, and it may cause serious indoor pollution. This raises the requirement for producing solid wood composite panels with smaller thickness from the perspective of actual demand.

[0005] The applicant has proposed an invention patent application with the publication number CN117183498A and the title "a very thin multi-layer solid wood composite base material, a preparation method thereof, and a floor". The application discloses a very thin multi-layer solid wood composite base material, which includes a laminated short core layer and a long core layer spaced layer by layer. The total number of veneers of the short core layer and the long core layer is 3, 5 or 7. The thickness of the base material is 2.0-5.0 mm. The short core layer includes a plurality of short core veneers arranged adjacent to each other along the length direction of the base material. The long core layer includes one or more long core veneers arranged adjacent to each other along the width direction of the base material. The thickness of the short core layer is less than or equal to the long core layer. The base plate can be used to prepare a floor (a kind of solid wood composite panel) with a thickness of 6.5-12 mm.

[0006] The above-mentioned solid wood composite board has both low manufacturing cost and good performance. It has relatively low thickness, so the manufacturing cost is relatively low; it also has relatively good deformation resistance, so it is not easy to warp or tile deform when the moisture content of the solid wood composite board changes greatly or under external force. SUMMARY

[0007] The inventor believes that a solid wood composite board with good adaptability should balance the manufacturing cost and the deformation resistance related to moisture change, i.e. dimensional stability, but should retain its property of corresponding deformation under external force. In other words, the thickness of the solid wood composite board should be further reduced and its structure should be improved so that it does not warp or tile deform when the moisture content changes greatly, but can deform correspondingly under external force, which makes the solid wood composite board have qualified dimensional stability and can adapt to the unevenness of the paving surface. Additionally, when the solid wood composite board has a certain degree of flexibility, its paving application is also more universal, such as some broken or curved decorations. The following technical solutions are used in this case: A flexible solid wood composite board, comprising a base plate and a surface plate covering the upper surface of the base plate and being bonded to it, a back groove grid is opened on the lower surface of the base plate, the back groove grid is composed of multiple back grooves, the depth of the back groove is 0-0.5mm less than the thickness of the base plate.

[0008] As a preferred, the thickness of the flexible solid wood composite board is not more than 6.5mm, and the thickness of the surface plate is 1-4mm.

[0009] As a preferred, the base plate is a multi-layer composite board with a 5-layer structure.

[0010] As a preferred, the width of the back groove is 2-5mm.

[0011] As a preferred, 8 back grooves intersect at the center to form a single unit in the shape of a "rice" character, and multiple units form a rectangular array to form the back groove grid.

[0012] As a preferred, the depth of the back groove is 0.3-0.5mm less than the thickness of the base plate.

[0013] As a preferred, a support plug is embedded in the center of the unit; the support plug is an elastic member, which includes a column body, the periphery of the column body extends outward to form 8 extension feet with the same interval angle, the extension feet include a pair of chordwise inserts on the column body and multiple ribs connecting the pair of chordwise inserts.

[0014] As a preferred, the free end of the extension foot is in interference fit with the back groove, the interference amount is 0.2-0.3mm, and the extension line of the pair of chordwise inserts passes through the center of the column body.

[0015] Another aspect of the present application provides a method for preparing the flexible solid wood composite board as described above, comprising the following steps: Step one, water balance step, the moisture content of the base plate and the surface plate is regulated to 6-7% under the environment of 40℃ / 30%RH; Step two, the step of compounding, after the upper surface of the base plate is glued, the surface plate is covered, and the two are bonded under the action of temperature of 80-90℃ and pressure of 1-1.2MPa; Step three, the step of making back grooves, the back grooves are opened on the base plate by cutting.

[0016] As a preferred, the back grooves include a plurality of unit back grooves arranged in a rectangular array, the unit back grooves are mi-shaped grooves; the method further comprises step four, a support plug is embedded in the center of the unit back groove.

[0017] In summary, the flexible solid wood composite board provided by the present application has a certain degree of flexibility and relatively good dimensional stability through the improvement of the structure, specifically through the setting of the back groove grid and the limitation of the depth of the back groove.

[0018] Further, by further reducing the thickness of the flexible solid wood composite board, the manufacturing cost thereof is avoided to be too high, and the flexible solid wood composite board naturally has a certain deformation ability.

[0019] Further, by setting the back groove grid to be composed of continuously repeated mi-shaped units, and further limiting the depth of the back groove, the flexibility of the flexible solid wood composite board can be improved, the toughness is also taken into account, and the dimensional stability of the flexible solid wood board can be improved.

[0020] Further, by the setting of the support plug, the structural strength of the intersection of the back grooves can be improved; at the same time, by limiting the structure of the support plug and the assembly relationship thereof with the back groove, the influence of the existence of the support plug on the deformation response of the flexible solid wood composite board can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The first structure schematic diagram of the flexible solid wood composite floor provided by the embodiments of the present application.

[0023] Figure 2 A second structural schematic diagram of the flexible solid wood composite floor provided by the embodiment of the present application.

[0024] Figure 3 A third structural schematic diagram of the flexible solid wood composite floor provided by the embodiment of the present application.

[0025] Figure 4 A structural schematic diagram of the supporting plug provided by the embodiment of the present application. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application. Embodiment 1

[0027] A preparation method of a flexible solid wood composite board, specifically including three steps.

[0028] Step one, water balance step.

[0029] Put the normally stacked base plate 1 and surface plate 2 in the same drying kiln, control the kiln environment temperature and humidity to 40℃ / 30%RH, allow a temperature deviation of 1℃ and a humidity deviation of 1%RH. The balance time is determined according to the initial moisture content of the base plate 1 and the surface plate 2, generally not less than 72 hours, until the moisture content of the base plate 1 and the surface plate 2 is adjusted to 6~7%.

[0030] Step two, the step of compounding.

[0031] Apply glue on the upper surface of the base plate 1 by roller coating, using a modified melamine resin adhesive with added compounding curing agent, with a solid content of 30%. Then cover the surface plate 2 and use a hot press for pressing. The hot plate temperature of the hot press is 80℃, and the pressure is 1~1.2MPa.

[0032] Step three, the step of making back groove.

[0033] Open a back groove grid on the base plate 1 by cutting, such as sawing or laser line cutting. The back groove grid is composed of multiple back grooves 3, the back grooves 3 are straight grooves arranged transversely and penetrating the width direction of the base plate 1, and the spacing between adjacent back grooves 3 is 10mm. Embodiment 2

[0034] Example 2 differs from Example 1 in that in Step two, the hot plate temperature of the hot press is 85°C. Example 3

[0035] Example 3 differs from Example 1 in that in Step two, the hot plate temperature of the hot press is 90°C.

[0036] Reference Figure 1 As shown, the flexible solid wood composite panel samples labeled 1-3 are prepared by the methods of Examples 1-3, respectively. The flexible solid wood composite panel has a thickness of 5.5 mm, and includes a base plate 1 and a surface plate 2 covering the upper surface of the base plate 1 and bonded thereto, and a back groove grid formed on the lower surface of the base plate 1, which is composed of a plurality of back grooves 3.

[0037] The base plate 1 is a 5-layer birch composite base material, with a size of 1200 mm (length) x 130 mm (width) x 3.5 mm (thickness), and an initial moisture content of 10-12%; the surface plate 2 is a red oak plate, with a size of 1200 mm (length) x 130 mm (width) x 2 mm (thickness), and an initial moisture content of 8-10%; the back groove 3 has a width of 3.5 mm and a depth of 3.5 mm, i.e., the base plate 1 is cut when the back groove 3 is made.

[0038] The flexible solid wood composite panel sample labeled 4 is prepared by the method of Example 2. The flexible solid wood composite panel has a thickness of 5.5 mm, and includes a base plate 1 and a surface plate 2 covering the upper surface of the base plate 1 and bonded thereto, and a back groove grid formed on the lower surface of the base plate 1, which is composed of a plurality of back grooves 3.

[0039] The base plate 1 is a 5-layer birch composite base material, with a size of 1200 mm (length) x 130 mm (width) x 3.5 mm (thickness), and an initial moisture content of 10-12%; the surface plate 2 is a red oak plate, with a size of 1200 mm (length) x 130 mm (width) x 2 mm (thickness), and an initial moisture content of 8-10%; the back groove 3 has a width of 3 mm and a depth of 3 mm.

[0040] The flexible solid wood composite panel sample labeled 5 is prepared by the method of Example 2. The flexible solid wood composite panel has a thickness of 5.5 mm, and includes a base plate 1 and a surface plate 2 covering the upper surface of the base plate 1 and bonded thereto, and a back groove grid formed on the lower surface of the base plate 1, which is composed of a plurality of back grooves 3.

[0041] The substrate 1 is a 3-layer birch composite substrate with a size of 1200 mm (length) x 130 mm (width) x 2.5 mm (thickness) and an initial moisture content of 10-12%; the surface plate 2 is a red oak plate with a size of 1200 mm (length) x 130 mm (width) x 3 mm (thickness) and an initial moisture content of 8-10%; the width of the back groove 3 is 2.5 mm and the depth is 2.5 mm, that is, the substrate 1 is cut when the back groove 3 is made.

[0042] The flexible solid wood composite plate with the label No. 6 is prepared by the method of Example 2. The thickness of the flexible solid wood composite plate is 4.5 mm, which includes the substrate 1 and the surface plate 2 covering the upper surface of the substrate 1 and being bonded to the substrate 1, and the lower surface of the substrate 1 is provided with a back groove grid formed by a plurality of back grooves 3.

[0043] The substrate 1 is a 3-layer birch composite substrate with a size of 1200 mm (length) x 130 mm (width) x 2.5 mm (thickness) and an initial moisture content of 10-12%; the surface plate 2 is a red oak plate with a size of 1200 mm (length) x 130 mm (width) x 2 mm (thickness) and an initial moisture content of 8-10%; the width of the back groove 3 is 2.5 mm and the depth is 2.5 mm, that is, the substrate 1 is cut when the back groove 3 is made. Example 4

[0044] The difference between Example 4 and Example 1 is that the back groove grid is formed by a plurality of unit rectangular arrays, and 8 back grooves 3 meet at the center to form a herringbone-shaped unit. The spacing between the transversely arranged back grooves 3 of adjacent units is 10 mm, and the spacing between the longitudinally arranged back grooves 3 of adjacent units is 10 mm. Example 5

[0045] The difference between Example 5 and Example 2 is that the back groove grid is formed by a plurality of unit rectangular arrays, and 8 back grooves 3 meet at the center to form a herringbone-shaped unit. The spacing between the transversely arranged back grooves 3 of adjacent units is 10 mm, and the spacing between the longitudinally arranged back grooves 3 of adjacent units is 10 mm. Example 6

[0046] The difference between Example 6 and Example 3 is that the back groove grid is formed by a plurality of unit rectangular arrays, and 8 back grooves 3 meet at the center to form a herringbone-shaped unit. The spacing between the transversely arranged back grooves 3 of adjacent units is 10 mm, and the spacing between the longitudinally arranged back grooves 3 of adjacent units is 10 mm.

[0047] Reference Figure 2As shown, the flexible solid wood composite panel samples labeled 7~9 were prepared by the method of Example 4~6 respectively. The flexible solid wood composite panel has a thickness of 5.5mm, which comprises a base plate 1 and a surface plate 2 covering and bonding to the upper surface of the base plate 1, and a plurality of back grooves 3 are arranged on the lower surface of the base plate 1.

[0048] The base plate 1 is a 5-layer birch composite base material with a size of 1200mm (length) x 130mm (width) x 3.5mm (thickness) and an initial moisture content of 10~12%; the surface plate 2 is a red oak plate with a size of 1200mm (length) x 130mm (width) x 2mm (thickness) and an initial moisture content of 8~10%; the back groove 3 has a width of 3mm and a depth of 3mm.

[0049] Reference Figure 3 and Figure 4 As shown, the flexible solid wood composite panel sample labeled 10 was prepared by the method of Example 5.

[0050] A support plug 4 is centrally embedded in the unit. The support plug 4 is an elastic member made of rubber, which comprises a column body 41, the periphery of the column body 41 extends outward to form 8 extension feet 42 with the same interval angle, the extension feet 42 comprise a pair of chordwise inserts 421 and a plurality of rib plates 422 connected to the pair of chordwise inserts 421. The free end of the extension feet 42 is in interference fit with the back groove 3, and the interference amount is 0.2~0.3mm, and the extension line of the pair of chordwise inserts 421 passes through the center of the column body 41. The thickness of the support plug 4 is 3mm.

[0051] The flexible solid wood composite panel sample labeled 11 was prepared by the method of Example 5. The difference between the sample 11 and the sample 10 is that the thickness of the support plug 4 is 5mm.

[0052] Comparative Example 1 Five layers of eucalyptus rotary cut veneers with surface glue were stacked in a longitudinal and transverse staggered manner, and after pressing and cutting, a base material with a size of 2100mm x 210mm and a thickness of 4.8mm was obtained, and a sub-rosewood veneer with a thickness of 0.8mm was pressed on the surface of the base material as a surface plate, and a eucalyptus veneer with a thickness of 0.8mm was pressed on the back as a back plate, and finally a floor with a thickness of 6.4mm was obtained. Marked as Comparative C1.

[0053] Comparative Example 2 Five layers of eucalyptus rotary cut veneers with surface glue were stacked in a longitudinal and transverse staggered manner, and after pressing and cutting, a base material with a size of 2100mm x 210mm and a thickness of 12.6mm was obtained, and a sub-rosewood veneer with a thickness of 0.8mm was pressed on the surface of the base material as a surface plate, and a eucalyptus veneer with a thickness of 0.8mm was pressed on the back as a back plate, and finally a floor with a thickness of 14.2mm was obtained. Marked as Comparative C2.

[0054] The physico-chemical properties of test pieces 1-10 and control test pieces C1-C2 are shown in Table 1.

[0055] Table 1

[0056] The foregoing description is for illustrative purposes, and is not intended to be limiting. Numerous implementations and numerous applications will be apparent to those skilled in the art having the benefit of this description. Therefore, no limitation is intended insofar as the scope of the tutor extends beyond that which is described herein, to the extent that it accords with the claims below and the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not a disclaimer of such subject matter; rather it reflects the presently appreciated scope of the tutor that is very different from the scope of the tutor disclosed in the application.

Claims

1. A flexible solid wood composite board, comprising a substrate (1) and a surface board (2) covering the upper surface of the substrate (1) and bonded thereto, characterized in that: A back groove grid is provided on the lower surface of the substrate (1), the back groove grid being composed of a plurality of back grooves (3), and the depth of the back grooves (3) being 0-0.5 mm smaller than the thickness of the substrate (1).

2. The flexible solid wood composite board according to claim 1, characterized in that: The thickness of the flexible solid wood composite board does not exceed 6.5 mm, and the thickness of the surface board (2) is 1 to 4 mm.

3. The flexible solid wood composite board according to claim 1, characterized in that: The substrate (1) is a multi-layer composite board with a 5-layer structure.

4. The flexible solid wood composite board according to claim 1, characterized in that: The width of the back groove (3) is 2-5 mm.

5. The flexible solid wood composite board according to claim 1, characterized in that: The eight back grooves (3) intersect at their center to form a M-shaped unit, and a plurality of rectangular arrays of the units form the back groove grid.

6. The flexible solid wood composite board according to claim 5, characterized in that: The depth of the back groove (3) is 0.3-0.5 mm smaller than the thickness of the substrate (1).

7. The flexible solid wood composite board according to claim 6, characterized in that: A support plug (4) is embedded in the center of the unit; the support plug (4) is an elastic member, which includes a column (41), the periphery of the column (41) extending outward to form 8 extension legs (42) with the same spacing angle, and the extension legs (42) include a pair of chord-wise inserts (421) located on the column (41) and a plurality of ribs (422) connecting the pair of chord-wise inserts (421).

8. The flexible solid wood composite board according to claim 7, characterized in that: The free end of the extension foot (42) is interference-fitted with the back groove (3), with a fitting margin of 0.2-0.3 mm, and the extension lines of the pair of chord-wise inserts (411) pass through the center of the column (41).

9. A method for preparing the flexible solid wood composite board according to claim 1, characterized in that: The following steps are involved: Step 1: moisture balance step, regulating the moisture content of the substrate (1) and the surface plate (2) to 6-7% under a 40°C / 30%RH environment; Step 2, a compounding step, after applying glue on the upper surface of the substrate (1), covering the surface plate (2), and bonding the two together at a temperature of 80-90° C. and a pressure of 1-1.2 MPa; Step three is the step of making a back groove, in which the back groove (3) is opened on the substrate (1) by cutting.

10. The preparation method according to claim 9, characterized in that The back groove (3) comprises a plurality of unit back grooves (31) arranged in a rectangular array, wherein the unit back grooves (31) are 'M'-shaped grooves; the preparation method further comprises step four, embedding a support plug (4) in the center of the unit back groove (31).

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