Three-layer solid wood composite floor with equal-seam core plate structure

Abstract

The utility model discloses a three-layer solid wood composite floor with an equal-seam core plate structure, which comprises a panel, a core plate and a back plate which are sequentially arranged from top to bottom and laminated, the panels are bonded and fixed through formaldehyde-free glue, the texture direction of the panel and the texture direction of the back plate are both perpendicular to the texture direction of the core plate, the core plate comprises a plurality of battens arranged along the length direction of the core plate, and the battens are arranged in the length direction of the core plate. Gaps with the same width are reserved between every two adjacent battens, and the battens are fixedly connected into a whole through the threading pipes. According to the utility model, the structure stability of the floor can be improved by adopting an overlying combination mode of vertical staggering of the textures of the face plate, the core plate and the back plate; due to the equal-joint design of the core plate, dry shrinkage and wet expansion can be achieved, the buffering effect is achieved, the moisture-proof size stability and the heat-resistant size stability of the floor are improved, the floor is more suitable for being used in the south and north environments, meanwhile, internal stress of the floor can be dispersed, and the structural stability is high; the plates are bonded and fixed through the formaldehyde-free glue, the formaldehyde emission of the floor can be greatly reduced, and the floor is environmentally friendly and safe.

Description

Technical Field

[0001] This utility model relates to the field of flooring, and in particular to a three-layer solid wood composite floor with an equal seam core board structure. Background Technology

[0002] Three-layer engineered wood flooring consists of a top layer, a core layer, and a bottom layer, bonded together with adhesive. Currently, existing three-layer engineered wood flooring has the following problems: First, the flooring's dimensional stability is poor, especially in southern regions where the flooring may warp due to humidity, affecting its normal use; second, the adhesives used in the manufacturing process contain formaldehyde and other harmful substances, posing a threat to the environment and human health, making it environmentally unfriendly.

[0003] Therefore, we need to design a three-layer solid wood composite floor with an equal seam core board structure to solve the above problems. Utility Model Content

[0004] The present invention addresses the problems of poor dimensional stability and the harmful effects of formaldehyde on the environment and human health associated with existing three-layer engineered wood flooring. The purpose of this invention is to provide a three-layer engineered wood flooring with an equal-joint core board structure to solve these problems.

[0005] According to one aspect of this utility model, a three-layer solid wood composite flooring with an equal-seam core board structure is provided, comprising a front panel, a core board, and a back panel arranged and laminated sequentially from top to bottom. The panels are bonded together with formaldehyde-free adhesive. The grain direction of the front panel and back panel is perpendicular to the grain direction of the core board. The core board includes multiple strips arranged along its length, with equal-width gaps between adjacent strips. The multiple strips are connected as a whole by conduit. The front panel, core board, and back panel of this utility model, through a vertically interlaced overlapping combination of grains, can improve the structural stability of the flooring. Furthermore, the equal-seam design of the core board allows for shrinkage and expansion due to moisture, acting as a buffer and improving the flooring's moisture and heat resistance dimensional stability, making it more suitable for use in both northern and southern environments. It also disperses internal stress, resulting in high structural stability. The formaldehyde-free adhesive bonding between the panels significantly reduces formaldehyde emissions, making it environmentally friendly and safe.

[0006] In some embodiments, the gap width between adjacent strips is 1–1.2 mm, and the width of the strips is 30–40 mm. Therefore, this type of three-layer engineered wood flooring with a core-joint structure will not deform due to excessive expansion from moisture or excessive contraction from dryness.

[0007] In some embodiments, the threading tube is parallel to the long side of the core board and passes through multiple strips. Thus, the threading tube can thread multiple strips as a single sheet.

[0008] In some embodiments, there are multiple conduits, evenly spaced within the core board. This results in a more robust connection between the strips.

[0009] In some embodiments, the side of the slat has a through hole for a conduit to pass through, the diameter of the through hole being adapted to the outer diameter of the conduit, and the outer wall of the conduit being fixed to the inner wall of the through hole with formaldehyde-free adhesive. This ensures a tight connection between the conduit and the slat.

[0010] In some embodiments, the conduit is a PVC conduit.

[0011] In some embodiments, the textures of the panel, core board, and back panel are sequentially arranged as parallel grain, cross grain, and parallel grain again. This interlacing of parallel and cross grain creates a pulling effect, thereby reducing horizontal deformation of the flooring.

[0012] In some embodiments, the thickness ratio between the front panel, core panel, and back panel is 3:10:3, 4:8:4, or 5:6:5. This symmetrical structure ensures a more balanced stress distribution among the three panels, preventing upward or downward bending deformation.

[0013] In some embodiments, the thickness of the panel is 3-5 mm; the thickness of the core board is 6-10 mm; and the thickness of the back panel is 3-5 mm.

[0014] In some embodiments, the panel is made of oak, birch, maple, black walnut, or hickory veneer, the strips are spruce strips, and the back panel is spruce veneer. Thus, the panel is made from natural, precious tree species, resulting in a beautiful, elegant, and high-end appearance; the core panel uses strips of the same material, with identical expansion coefficients between the strips.

[0015] The beneficial effects of this utility model are as follows:

[0016] The panel, core board, and back board of this invention, through a vertically interlaced overlapping combination of textures, can improve the structural stability of the flooring. Furthermore, the equal joint design of the core board allows for shrinkage and expansion due to moisture, acting as a buffer and improving the flooring's moisture and heat resistance dimensional stability, making it more suitable for use in both northern and southern environments. It also disperses internal stress, resulting in high structural stability. The boards are bonded together with formaldehyde-free adhesive, which greatly reduces formaldehyde emissions, making it environmentally friendly and safe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0018] Figure 2 This is a top view of the core board of this utility model.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the strip of this utility model;

[0020] Figure 4 This is a schematic diagram showing the grain direction of each plate in this utility model.

[0021] In the diagram: 1. Front panel; 2. Core board; 21. Strip; 22. Gap; 23. Conduit; 24. Through hole; 3. Back panel. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] The present invention and its embodiments are described below. This description is not restrictive, and the actual embodiments are not limited thereto. In short, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

[0024] refer to Figure 1-4 This utility model provides a three-layer solid wood composite floor with an equal-seam core board structure, comprising a front panel 1, a core board 2, and a back panel 3 arranged and laminated sequentially from top to bottom, and the boards are fixed together by formaldehyde-free adhesive. Specifically, the formaldehyde-free adhesive is a soybean-based protein adhesive used in the wood industry, which is formaldehyde-free and ENF-grade environmentally friendly. The grain direction of the front panel 1 and the back panel 3 is perpendicular to the grain direction of the core board 2. The core board 2 includes multiple strips 21 arranged along the length of the core board 2. The strips 21 are parallel to each other, and all strips 21 are made of the same material and have the same width. There is a gap 22 of equal width between adjacent strips 21. The multiple strips 21 are fixedly connected into one piece by conduit 23. The panel 1, core board 2, and back board 3 of this utility model, through a stacking combination of vertically interlaced textures, can improve the structural stability of the flooring. Furthermore, the equal joint design of the core board 2 can buffer the expansion and contraction due to dryness and moisture, improving the flooring's moisture resistance and heat resistance dimensional stability, making it more suitable for use in both northern and southern environments. At the same time, it can disperse the internal stress of the flooring, resulting in high structural stability. The boards are bonded and fixed together with formaldehyde-free adhesive, which can greatly reduce the formaldehyde release of the flooring, making it environmentally friendly and safe.

[0025] The gap 22 between adjacent strips 21 is 1-1.2 mm wide, and the width of the strips 21 is 30-40 mm, preferably 35 mm. With this configuration, the three-layer solid wood composite flooring with such a core board structure will not deform due to excessive expansion when wet or excessive contraction when dry.

[0026] The conduit 23 is parallel to the long side of the core board 2 and passes through multiple strips 21. The conduit 23 allows for threading multiple strips 21 as a single sheet. Multiple conduits 23 are arranged at equal intervals within the core board 2, preferably 3 to 5. This arrangement ensures a more secure connection between the strips 21. The side of each strip 21 has a through hole 24 for the conduit 23 to pass through. The diameter of the through hole 24 matches the outer diameter of the conduit 23, and the outer wall of the conduit 23 is fixed to the inner wall of the through hole 24 with formaldehyde-free adhesive. This arrangement ensures a tight connection between the conduit 23 and the strip 21. The conduit 23 is made of PVC.

[0027] The grain patterns of the panel 1, core board 2, and back board 3 are, in order, longitudinal, transverse, and longitudinal. The transverse and longitudinal grains interweave, creating a mutual tensile force that reduces horizontal deformation of the flooring. Specifically, when the flooring is rectangular, with panel 1 and back board 3 having longitudinal grain and core board 2 having transverse grain, the expansion of the wood after absorbing moisture primarily involves a change in the transverse grain direction. The transverse grain of core board 2 further reduces horizontal deformation. Furthermore, because panel 1 and back board 3 are made of longitudinally grained solid wood, meaning their grain direction aligns with the length of the flooring (the length of panel 1 and back board 3), their mechanical strength is increased, making them less prone to tearing.

[0028] The thickness of the front panel 1 is equal to the thickness of the back panel 3. The thickness ratio of the front panel 1, core panel 2, and back panel 3 is 3:10:3, 4:8:4, or 5:6:5. This symmetrical structure ensures more balanced stress distribution among the three panels, preventing warping or buckling. Specifically, the thickness of the front panel 1 is 3–5 mm; the thickness of the core panel 2 is 6–10 mm; and the thickness of the back panel 3 is 3–5 mm. Taking a wood flooring with a total thickness of 16 mm after assembly as an example: in one embodiment, the thickness of the front panel 1 is 3 mm, the thickness of the core panel 2 is 10 mm, and the thickness of the back panel 3 is 3 mm; in another embodiment, the thickness of the front panel 1 is 4 mm, the thickness of the core panel 2 is 8 mm, and the thickness of the back panel 3 is 4 mm; in yet another embodiment, the thickness of the front panel 1 is 5 mm, the thickness of the core panel 2 is 6 mm, and the thickness of the back panel 3 is 5 mm.

[0029] The panel 1 is made of oak, birch, maple, black walnut, or hickory veneer; the slats 21 are spruce veneers; and the back panel 3 is spruce veneer, preferably made of Finnish spruce. Panel 1 is crafted from natural, precious tree species, resulting in a beautiful, elegant, and high-end appearance. The core panel 2 uses the same material as the slats 21, with all slats having the same coefficient of thermal expansion. The moisture content of panel 1 is 8%–12%, core panel 2 is 10%–15%, and back panel 3 is 10%–15%. Because panel 1 is made from different wood species than core panel 2 and back panel 3, their physical and mechanical properties differ significantly. This moisture content setting for panel 1, core panel 2, and back panel 3 is designed to reduce floor deformation caused by stress release during the curing process.

[0030] It should be noted that when the panel 1, core board 2, and back board 3 are cuboid or the floor is cuboid, and the floor is placed horizontally on the ground with the back board 3 at the bottom and the panel 1 at the top: in this invention, "straight grain" means that the length direction of the floor is consistent with the grain direction of the wood. For example, the length direction of the panel 1 or the back board 3 can be consistent with the grain direction of the wood. "Where grain" means that the width direction of the floor is consistent with the grain direction of the wood. For example, the width direction of the core board 2 can be consistent with the grain direction of the wood. "Thickness" refers to the thickness in the vertical direction.

Claims

1. A three-layer solid wood composite floor with an equal-joint core board structure, characterized in that, The system includes a panel (1), a core board (2), and a back board (3) arranged and stacked from top to bottom. The boards are bonded and fixed together with formaldehyde-free adhesive. The texture direction of the panel (1) and the back board (3) is perpendicular to the texture direction of the core board (2). The core board (2) includes multiple strips (21) arranged along the length of the core board (2). There are gaps (22) of equal width between adjacent strips (21). The multiple strips (21) are fixedly connected into one piece by a conduit (23).

2. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 1, characterized in that, The gap (22) between adjacent strips (21) is 1 to 1.2 mm wide, and the strips (21) are 30 to 40 mm wide.

3. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 1, characterized in that, The conduit (23) is parallel to the long side of the core board (2) and passes through multiple strips (21).

4. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 3, characterized in that, The conduit (23) consists of multiple tubes, which are evenly distributed in the core plate (2).

5. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 4, characterized in that, The side of the strip (21) is provided with a through hole (24) for the conduit (23) to pass through. The diameter of the through hole (24) is adapted to the outer diameter of the conduit (23), and the outer wall of the conduit (23) is fixed to the inner wall of the through hole (24) with formaldehyde-free glue.

6. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 1, characterized in that, The conduit (23) is a PVC conduit.

7. The three-layer solid wood composite flooring with an equal-joint core board structure according to claim 1, characterized in that, The textures of the panel (1), core board (2) and back board (3) are, in order, parallel grain, horizontal grain, and parallel grain.

8. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 1, characterized in that, The thickness ratio between the panel (1), core board (2), and back board (3) is 3:10:3, 4:8:4, or 5:6:

5.

9. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 8, characterized in that, The thickness of the panel (1) is 3-5 mm; the thickness of the core board (2) is 6-10 mm; and the thickness of the back plate (3) is 3-5 mm.

10. The three-layer solid wood composite flooring with an equal joint core board structure according to claim 1, characterized in that, The panel (1) is made of oak, birch, maple, black walnut or hickory veneer, the slats (21) are spruce slats, and the back panel (3) is spruce veneer.

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