Light bamboo-aluminum honeycomb sandwich panel with pre-veneer

Abstract

The utility model discloses a light bamboo-aluminum honeycomb sandwich panel with a pre-veneer and a manufacturing method thereof. The light bamboo-aluminum honeycomb sandwich panel with the pre-veneer is composed of a surface board pre-veneer, a bamboo surface board, an adhesive layer and a honeycomb core layer. The surface board pre-veneer is a melamine veneer, a PET veneer or a paint veneer, the bamboo surface board is made of bamboo laminated wood or bamboo veneer, and the honeycomb core layer is a single-layer honeycomb core or a honeycomb core with skin.

Description

Technical Field

[0001] The utility model relates to the technical field of bamboo integrated material processing, in particular to a pre-faced lightweight bamboo aluminum honeycomb sandwich panel. Background Art

[0002] As a natural, pollution-free green material, bamboo laminated wood is fully in line with the concept of ecological environmental protection. In addition, bamboo is a cultural spirit that has been passed down in my country since ancient times. The continuous development and application of new high-standard bamboo laminated wood has demonstrated the demonstration effect of bamboo-based panels in the entire construction-related industry chain, making bamboo-based panels have a significant green value potential in terms of social benefits.

[0003] However, bamboo composite materials have high density, high cost, and easy deformation, which have become key constraints affecting their promotion and application. 3 According to calculations, a single piece of bamboo laminate is about 20% heavier than a wood-based panel. Bamboo panels made of narrow and small materials are prone to deformation, cracking and other quality problems due to shrinkage and swelling. Since the raw material price of bamboo panels is relatively high, the processing requires complex process flow such as painting, resulting in the production cost of painted bamboo panels being 2-3 times that of plywood products of the same specification, and 3-4 times that of particleboard products, which is at the same price level as beech solid wood panels. Therefore, the development of low-density, low-cost, anti-deformation integrated bamboo panels has become one of the key factors in promoting the high-quality development of the bamboo industry. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, realize light weight, anti-deformation, low-cost integration by constructing a "honeycomb bionic structure", and simultaneously realize the creation of a "paint-free" lightweight bamboo aluminum honeycomb sandwich panel by using a pre-faced surface. The lightweight bamboo aluminum honeycomb sandwich panel manufacturing method is simple and compact, and has the characteristics of "panel-type production" throughout the entire process.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a pre-faced lightweight bamboo aluminum honeycomb sandwich panel, comprising: a surface panel pre-faced, a bamboo surface panel, a glue layer, and a honeycomb core layer; the surface panel pre-faced is a melamine face, a PET face or a paint face; the bamboo surface panel is a bamboo integrated material or a bamboo veneer.

[0006] Furthermore, the thickness of the bamboo integrated material is 1.5 mm-8 mm; the thickness of the bamboo veneer is 0.3-1.2 mm.

[0007] Furthermore, the bamboo integrated material is formed by gluing bamboo strips with a width of 3mm-15mm on the sides and splicing them together.

[0008] Furthermore, the adhesive layer is a liquid adhesive or a film adhesive, and the liquid adhesive or the film adhesive is a polyurethane adhesive.

[0009] Furthermore, the honeycomb core layer is a single-layer honeycomb core or a honeycomb core with skin, and the honeycomb core layer is an aluminum honeycomb or a plastic honeycomb.

[0010] The advantages of this technology are:

[0011] (1) The pre-faced lightweight bamboo aluminum honeycomb sandwich panel of the utility model is composed of a thin bamboo surface plate and a porous honeycomb, and its equivalent density is only 0.0-0.5 times that of solid bamboo composite materials, which greatly reduces the weight of the bamboo board.

[0012] (2) The upper and lower bamboo panels of the pre-faced lightweight bamboo aluminum honeycomb sandwich panel of the utility model are symmetrically arranged to achieve the purpose of stress balance. The middle honeycomb core layer can further buffer the uneven shrinkage stress from the upper and lower surfaces, thereby achieving better anti-deformation ability of the panel.

[0013] (3) The pre-finished lightweight bamboo aluminum honeycomb sandwich panel of the utility model adopts the bamboo surface board pre-finishing technology and process, avoiding the cumbersome painting process, greatly shortening the board processing cycle, and improving the board production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model provides a schematic diagram of the structure of a pre-faced lightweight bamboo aluminum honeycomb sandwich panel.

[0015] The symbols in the figure represent:

[0016] 1. Surface pre-facing; 2. Bamboo surface; 3. Adhesive layer; 4. Honeycomb core layer DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Embodiment 1:

[0019] In this embodiment, upper and lower panels with a thickness of 5 mm are bonded to an aluminum honeycomb core layer, and the 5 mm thick upper and lower panels are melamine faced. A 12 mm thick aluminum honeycomb is used, and polyurethane film glue is used to hot-press the bamboo integrated material surface panels and the aluminum honeycomb core layer. The polyurethane film glue is sandwiched between the aluminum honeycomb core layer and the upper and lower bamboo integrated material surface panels. The temperature is adjusted to 170°C by a hot press and the pressure is maintained for ten minutes, and the polyurethane film glue automatically melts for gluing and fixing. The gluing and pressing of the pre-finished lightweight bamboo aluminum honeycomb sandwich panel is completed, and a 22 mm thick pre-finished lightweight bamboo aluminum honeycomb sandwich panel bonded with polyurethane film glue is obtained.

[0020] Embodiment 2:

[0021] In this embodiment, bamboo composite materials with 3mm thickness of upper and lower panels are glued to aluminum honeycomb core layer, 3mm thick upper and lower panels are PET faced, 16mm thick aluminum honeycomb and aluminum skin are used for upper and lower skinning, polyurethane film glue is used for hot pressing bonding between bamboo composite material panel and aluminum honeycomb core layer, polyurethane film glue is sandwiched between aluminum honeycomb core layer and upper and lower bamboo composite material panel, the temperature is adjusted to 170℃ by hot press and the pressure is maintained for ten minutes, then the polyurethane film glue automatically melts for gluing and fixing, thus completing the gluing and pressing of pre-faced lightweight bamboo aluminum honeycomb sandwich panel, and obtaining pre-faced lightweight bamboo aluminum honeycomb sandwich panel with 22mm thickness bonded by polyurethane film glue.

[0022] Embodiment 3:

[0023] In this embodiment, bamboo composite materials with 3mm thick upper and lower panels are glued to the aluminum honeycomb core layer, the 3mm thick upper and lower panels are painted, and a 12mm thick aluminum honeycomb is used. Polyurethane liquid glue is used to hot-press glue the bamboo composite material surface panels and the aluminum honeycomb core layer. The polyurethane glue is applied to the middle of the bamboo composite material and the aluminum honeycomb core layer for pressing and gluing, and a 18mm thick pre-finished lightweight bamboo aluminum honeycomb sandwich panel glued with polyurethane liquid glue is obtained.

[0024] Embodiment 4:

[0025] In this embodiment, upper and lower panels are 2mm thick bamboo composite materials and plastic honeycomb core layers are glued together. The upper and lower panels are painted and finished. A 14mm thick plastic honeycomb is used. Polyurethane liquid glue is used to hot-press glue the bamboo composite material surface panels and the plastic honeycomb core layers. The polyurethane glue is applied to the middle of the bamboo composite material and the plastic honeycomb core layers for pressing and gluing, thereby obtaining a 18mm thick pre-finished lightweight bamboo plastic honeycomb sandwich panel glued with polyurethane liquid glue.

[0026] The mechanical properties of the 22 mm thick pre-faced lightweight bamboo aluminum honeycomb sandwich panel and the 18 mm thick pre-faced lightweight bamboo aluminum honeycomb sandwich panel in the above Examples 1 and 3 are shown in Table 1. The test standard is: GB / T 17657-2013 Test method for physical and chemical properties of wood-based panels and veneered wood-based panels, wherein the longitudinal direction refers to the length direction of the specimen being consistent with the honeycomb stretching direction, and the transverse direction refers to the length direction of the specimen being perpendicular to the honeycomb stretching direction.

[0027] Table 1 Performance test of aluminum-wood composite board and 22mm thick and 18mm thick lightweight bamboo aluminum honeycomb board

[0028]

[0029] It can be seen from Table 1 that the static bending strength, elastic modulus and surface bonding strength of the proposed new board meet the requirements of GB / T4897.4-2003 particleboard part 4: structural board for use in a dry state.

[0030] The specific strengths of the 18 mm thick pre-faced lightweight bamboo aluminum honeycomb sandwich panel in the above Example 3 and other comparative example panels are shown in Table 2. Specific strength = static bending strength / density.

[0031] Table 2 Specific strength of different types of plates

[0032]

[0033] It can be seen from Table 2 that the bending strength of the 18mm lightweight bamboo aluminum honeycomb sandwich panel proposed by the utility model is 2.3 times that of the particle board, 1.5 times that of the medium density fiberboard, and 1.2 times that of the high density fiberboard.

[0034] The thickness change rate of the 18 mm thick pre-faced lightweight bamboo aluminum honeycomb sandwich panel and the 18 mm and 22 mm thick bamboo laminated wood in the above Example 3 under 30°C and 85% relative humidity is shown in Table 3. Wherein, the thickness change rate = (thickness after moisture absorption - original thickness) / original thickness.

[0035] Table 3 Thickness change rate of different types of plates under 85% high humidity environment

[0036]

[0037] It can be seen from Table 3 that the pre-faced lightweight bamboo aluminum honeycomb sandwich panel proposed in this patent has better stability than bamboo integrated materials of the same thickness and has stronger moisture-proof performance.

Claims

1. A pre-faced lightweight bamboo aluminum honeycomb sandwich panel, characterized in that: include: A surface panel pre-finish (1), a bamboo surface panel (2), an adhesive layer (3), and a honeycomb core layer (4); the surface panel pre-finish (1) is a melamine finish, a PET finish, or a paint finish; and the bamboo surface panel (2) is a bamboo composite material or a bamboo veneer.

2. The pre-faced lightweight bamboo aluminum honeycomb sandwich panel according to claim 1, characterized in that: The thickness of the bamboo integrated material is 1.5 mm to 8 mm; the thickness of the bamboo veneer is 0.3 mm to 1.2 mm.

3. The pre-faced lightweight bamboo aluminum honeycomb sandwich panel according to claim 1, characterized in that: The bamboo integrated material is formed by gluing and splicing bamboo strips with a width of 3mm-15mm on the sides.

4. The pre-faced lightweight bamboo aluminum honeycomb sandwich panel according to claim 1, characterized in that: The adhesive layer (3) is a liquid adhesive or a film adhesive.

5. The pre-faced lightweight bamboo aluminum honeycomb sandwich panel according to claim 4, characterized in that: The liquid adhesive or film adhesive is a polyurethane adhesive.

6. The pre-faced lightweight bamboo aluminum honeycomb sandwich panel according to claim 1, characterized in that: The honeycomb core layer (4) is a single-layer honeycomb core or a honeycomb core with skin.

7. The pre-faced lightweight bamboo aluminum honeycomb sandwich panel according to claim 1, characterized in that: The honeycomb core layer (4) is an aluminum honeycomb or a plastic honeycomb.

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