CN102896666A - Manufacturing method for composite artificial board (LVS) - Google Patents

Abstract

Plywood, particleboard, and medium (high) density fiberboard have different composition units and processing techniques, and while each has good mechanical strength, it also has problems such as easy warping, deformation, cracking, poor coloring performance, and inability to engrave and mill on the surface. Shortcomings. The invention provides a manufacturing method of a composite artificial board: medium and high-density fiberboard is used for the surface layer (panel and backboard), and multi-layer plywood or particle board is used for the inner lining layer of the base material; The medium (high) density fiberboard is roughened, and then the core material is double-sided glued, and finally sent to the hot press for hot pressing. The invention solves the problems existing in common plywood and particle board, improves the dimensional stability and compressive strength of the board, and extends and widens the application field of the composite board. More importantly, the composite wood-based panel (LVS) can make use of both large-diameter wood and small-diameter branch wood, so as to achieve the purpose of comprehensive utilization of the whole tree.

Description

Method for manufacturing composite wood-based panels (LVS)

1. Technical field

The invention relates to a method for manufacturing a composite wood-based panel (LVS). The composite wood-based panel (LVS) produced by the manufacturing method can easily process decorative panels with concave-convex textures or various engraving and milling patterns on the surface. the

2. Background technology

At present, the widely used plywood, particleboard and medium (high) density fiberboard have different composition units and processing techniques. the

Plywood is a board formed by cutting logs into large veneers along the direction of annual rings, after drying and gluing, they are assembled and glued according to the principle that the wood grain directions of adjacent veneer layers are perpendicular to each other. Its advantages are: high strength and good bending resistance. The disadvantages are: poor stability, easy warping, bubbling, partial cracking, and production needs to consume a lot of large-diameter logs, wasting wood resources. the

Particleboard is a man-made board made by cutting wood and other raw materials into pieces of certain specifications, drying them, mixing them with adhesives, hardeners, and waterproofing agents, and pressing them at a certain temperature. Its advantages are: good lateral load-bearing capacity, smooth surface, realistic texture, uniform bulk density, small thickness error, pollution resistance, and aging resistance. The disadvantage is: the interior is a granular structure, which is not easy to mill. Medium (high) density fiberboard Medium density fiberboard is a kind of man-made board made of wood fiber or other plant fiber, after crushing, fiber separation, drying, applying urea-formaldehyde resin or other suitable adhesives, and then hot pressing . Its advantages are smooth surface, fine material, good toughness, not easy to break, and convenient for molding and milling. The disadvantage is that the plane tensile strength is lower. the

Due to the disadvantages of plywood, particle board and medium (high) density fiberboard in different degrees, their application range is limited to a certain extent. the

3. Contents of the invention

Composite wood-based panel-LVS (Laminated Veneer Sandwich) is a composite material with multi-layer plywood or particleboard as the base material lining and thin medium (high) density fiberboard as the surface material. It can solve the shortcomings of ordinary plywood and particleboard, such as easy warping, deformation, cracking, poor coloring performance, and the surface cannot be engraved and milled. At the same time, its physical and mechanical properties are obviously better than plywood, medium ( High-density fiberboard or particleboard, its application field has also been extended and broadened. More importantly, the composite wood-based panel (LVS) can make use of both large-diameter wood and small-diameter branch wood, so as to achieve the purpose of comprehensive utilization of the whole tree. the

(1) technical problem to be solved in the present invention

The invention mainly solves two technical problems: one is the optimal design of the product structure; the other is the problem of determining the process route of the composite wood-based panel. the

(2) The technical solution adopted by the present invention to solve its technical problems

The present invention adopts the following technical solutions in solving the optimization design problem of product structure:

First, plywood, particle board or LVL is used as the core material, and thin medium (high) density fiberboard is used as the upper and lower surface materials to form a blank. The structural design scheme of the LVS finished board is shown in Table 1;

Then, according to the difference in the thickness of the core layer and the upper and lower surface materials, the composite wood-based panels were tested and numbered, and the LVS finished panels were made under the same hot-pressing process parameters. LVS composite molding hot pressing process parameters are shown in Table 2;

Finally, various index tests are carried out on different numbers of LVS finished boards to determine the optimal billet structure of composite wood-based panels (LVS), and then realize the optimal design of composite wood-based panels. The test results are shown in Table 3. the

The present invention adopts the following technical schemes on the problem of determining the manufacturing process route of composite wood-based panels: 1. Using veneer (according to grain formation) or particleboard as the core material, and thin medium (high) density fiberboard as the upper and lower surface materials, carry out One-time molding process of forming LVS by hot pressing of billets; 2. First, hot press the veneer (according to the crisscross billet) to make multi-layer plywood, and then use multi-layer plywood or particle board as the core material, thin medium (high ) Density fiberboard is used as the upper and lower surface materials, and the secondary molding process of LVS is formed by hot pressing of the billets; 3. The bonding strength, peeling rate and elastic modulus of the LVS made under different manufacturing process routes are tested. testing, and ultimately select the best manufacturing process. the

Table 1 Structural design scheme of LVS finished board

Table 2 LVS composite molding hot pressing process parameters

Table 3 Test values of various indicators of LVS

(3) Beneficial effects of the present invention

The main effects of the present invention are: 1. The whole tree can be fully and rationally utilized, thereby avoiding the use of too many large-diameter logs, which is not only beneficial to the protection of forest large-diameter timber resources, but also adds a new variety to the wood-based panel family 2. As the total production capacity of China's multi-layer plywood and medium (high) density fiberboard tends to be saturated, some products are currently unsalable, so LVS composite materials expand the use of multi-layer plywood, particleboard and medium (high) density fiberboard 3. The production process and equipment selection involved in LVS are reasonable and reliable, and only some equipment can be added to produce composite wood-based panel LVS without affecting the production of base materials. the

4. Description of drawings

Fig. 1 is a schematic diagram of the LVS finished board structure; among the figures, 1 is a medium (high) density fiberboard, 2 is a multi-layer plywood, LVL, or particle board, and 3 is an adhesive layer. Among them, the multi-layer plywood is made of veneer criss-cross pattern, and all LVL is made of veneer along the grain. the

Figure 2 is the LVS one-time molding process roadmap;

Figure 3 is a roadmap of LVS secondary molding process. the

5. Specific implementation

1. The LVS product made by the secondary molding process of the present invention has high quality, good bonding strength, peeling rate, elastic modulus and other indicators. In addition, the positioning of the upper and lower surfaces of the secondary molding process is relatively easy, so the present invention mainly adopts two LVS is made by secondary molding process method. the

2. The test results show that the structural parameters and hot-pressing process parameters of test number 4 are relatively ideal, and its static bending strength and internal bonding strength in the vertical direction are higher than those of other test numbers. Its water-absorbing thickness expansion rate is also relatively low, so the present invention mainly adopts the structural parameters and hot-pressing process parameters of No. 4 experimental scheme. the

Claims (4)

1. the invention provides the manufacture method of a kind of combined artificial board material (LVS), do the base material liner with particieboard or multi-plywood, (height) density fiber board is done plane materiel and is made combined artificial board material in 2-3 millimeter slim, it is characterized in that: be as core material take multi-plywood or particieboard, LVL, in thick or slim middle density tabulation plate material, both are combined with each other through gluing, assembly, make by high temperature hot pressing.

2. combined artificial board material according to claim 1 (LVS) manufacture method, it is characterized in that: before the assembly, adopt 60-80 order abrasive band that (height) density fiber board in slim is carried out plucking and process, then core material is carried out double spread, glue-spread is controlled at 280g/cm ², to send hot press to and carry out hot pressing, hot pressing time is 30s/mm, pressure is 1Mp/cm ², its hot pressing temperature is 100 ℃ when adopting urea-formaldehyde resin adhesive, its hot pressing temperature is 140 ℃ when adopting phenolic resin glue.

3. combined artificial board material according to claim 1 (LVS) manufacture method is characterized in that: utilize the post forming method, in the preparation process of core material glued board, adopt the crisscross assemble pattern of veneer to carry out assembly.

4. combined artificial board material according to claim 1 (LVS) manufacture method, it is characterized in that: 3mmMDF, 12mm glued board, 3mmMDF are carried out plucking, gluing, assembly, and sizing material is urea-formaldehyde resin adhesive, and pressure is 1.1Mp/cm ², hot pressing temperature is 100 ℃, hot pressing time is 480s.

Images