CN106985037A - A kind of formaldehydeless coating-free veneer facing decorative board of dry glue and its production technology - Google Patents

Abstract

The present invention discloses a kind of formaldehydeless coating-free veneer facing decorative board of dry glue and its production technology, is related to artificial board decorative technical field, the production technology comprises the following steps：(1) base material prepares；(2) adhesive backers is selected；(3) base is matched somebody with somebody；(4) hot pressing；(5) it is cold-pressed；(6) post-production.The decorative panel is divided into two-sided Veneer-faced Decorative Board and one side Veneer-faced Decorative Board；The two-sided Veneer-faced Decorative Board also includes plastic sheeting and veneer dash board, and the veneer dash board is placed in the upper and lower surface of artificial board substrate's layer, and plastic sheeting is laid between veneer dash board and artificial board substrate's layer；The one side Veneer-faced Decorative Board also includes plastic sheeting and veneer dash board, and the veneer dash board is placed in the upper and lower both sides wherein side of artificial board substrate's layer.The formaldehydeless coating-free veneer facing decorative board environmental protection of dry glue of the present invention, uncontaminated gases discharge, the problem of solving traditional adhesive easy seep through, water resistance is more preferably.

Description

A dry glue-free formaldehyde-free coating thin wood veneer decorative board and its production process

technical field

The invention relates to the technical field of wood-based panels, in particular to a formaldehyde-free dry glue-free veneer veneer decorative panel.

Background technique

Veneer veneer is a kind of advanced decoration method of wood-based panel. It is made of precious wood with beautiful texture or imitation precious wood made by artificial method. Made of glue. Decorating wood-based panel substrates with thin wood veneers can not only improve the appearance quality of wood-based panel products, but also improve their physical and mechanical properties, thereby expanding the use of wood-based panel products, which is an effective measure to improve wood utilization.

Adhesives used in wood-based panel veneer decoration process include urea-formaldehyde resin adhesive (UF), latex white glue (PVAc) and a mixture of the two. UF resin adhesive, good bonding performance, high water resistance, low price. However, the initial viscosity of the UF resin adhesive is low, and it is easy to dislocate the veneer in the process of veneering, and it is easy to cause glue penetration. PVAc is a thermoplastic resin glue with good handling properties but poor water resistance. In actual production, PVAc is often mixed with UF resin adhesive. The greater the amount of UF resin added, the better the water resistance of the adhesive and the greater the bonding strength, but the problem of free formaldehyde pollution will be more serious. At the same time, since both UF and PVAc are liquid adhesives, it is generally necessary to use special equipment to apply glue to wood-based panels during production, which increases the number of operators and process links.

In order to overcome this problem, the State Patent Office disclosed a patent application No. 200510030353.1 on August 21, 2005, and the name is a patent for invention of a dry glue-free veneer veneer process. This patent discloses the following technical solution: using dry melamine film paper as the adhesive material, no glue application equipment is required, the production process is simplified, and environmental pollution is reduced. However, melamine film paper is formed by impregnating and drying melamine resin or melamine modified UF resin, and still has certain problems such as formaldehyde pollution. At the same time, when using melamine-coated paper as the adhesive material, the hot-pressing temperature is generally higher, 190-200°C, which easily destroys the basic physical and mechanical properties of the wood-based panel substrate.

Contents of the invention

The problem to be solved by the present invention is to provide an environment-friendly, non-polluting gas emission, easy penetration of traditional adhesives, and better water resistance dry glue formaldehyde-free veneer veneer decorative board. For this reason, propose following technical scheme now:

The invention provides a production process of dry glue formaldehyde-free veneer veneer decorative board, comprising the following steps:

(1) Base material preparation: select wood-based panels as the base material layer, repair the base material with knots, cracks and resin capsules, then polish and sand the base material to remove the pre-cured layer on the surface of the base material, Make the surface of the substrate smooth and uniform in thickness, and then cut and glue the veneer according to the size of the wood-based panel substrate;

(2) Adhesive material selection: Use formaldehyde-free plastic film as the adhesive. If recycled plastic film is used as the adhesive, clean the plastic film with clean water and dry it at room temperature before use;

(3) Blank matching: place the plastic film between the veneer and the wood-based panel substrate. The slab is a single-sided veneer slab or a double-sided veneer slab. Balanced, the tree species, thickness, moisture content and grain direction of the veneer on both sides of the substrate are consistent;

(4) Hot pressing: send the slab paved in step (3) into a hot press for hot pressing; the hot pressing temperature of the hot press is 130-160°C, and the hot-pressing time is 0.5-1.5min. mm ^-1 , the hot pressing pressure is 0.5~1.5MPa;

(5) cold pressing: the slab after hot pressing in the step (4) is transferred to the cold press and carried out the post-sizing treatment to make a veneer veneer decorative board semi-finished product;

(6) Post-processing: Check the quality of the veneer glue on the semi-finished decorative board after the cold pressing. If there is oil or rust on the surface of the veneer, use low-concentration oxalic acid, alcohol or ether to clean the surface of the veneer; Put the semi-finished veneer veneer decorative board under natural conditions for 8 to 48 hours to eliminate thermal stress, and then perform sawing and sanding in turn to form a dry glue-free formaldehyde-free veneer veneer decorative board.

As a further improvement to the above solution, in step (1), the thickness of the sanding treatment is controlled below 0.3 mm, and the thickness deviation of the substrate is controlled within 0.1-0.2 mm.

To the further improvement of above-mentioned scheme, in step (1), the artificial board base material that described wood-based board base material layer is used is a kind of in plywood, medium density fiberboard, particleboard, blockboard; In step (2) , the plastic film is one of pure polyethylene film, recycled agricultural mulch film, recycled express bags, garbage bags, and food bags.

As a further improvement to the above scheme, the moisture content of the wood-based panel substrate is 8% to 12%; the thickness of the veneer is 0.4 to 0.6mm, and the moisture content is 8% to 12%; the thickness of the plastic film is 0.01mm～0.1mm.

As a further improvement to the above solution, in step (5), the cold pressing time of the cold press is 2 to 10 minutes, and the cold pressing temperature is 25 to 55°C.

The present invention also provides a decorative panel made based on the dry glue formaldehyde-free coating veneer veneer production process described in the above scheme, including a wood-based panel base layer, and the decorative panel is divided into double-sided veneer veneer Decorative board and single-sided veneer veneer decorative board; the double-sided veneer veneer decorative board also includes a plastic film and a veneer surface plate, the veneer surface plate is placed on the upper and lower surfaces of the wood-based panel base layer, and the plastic film is flat Lay between the veneer surface board and the wood-based panel substrate layer; the single-sided veneer veneer decorative board also includes a plastic film and a veneer surface board, and the veneer surface board is placed on the upper and lower sides of the wood-based panel base layer On one side, the plastic film is laid flat between the veneer veneer and the plywood base layer.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The present invention uses solid plastic film as the adhesive material, and the plastic film itself does not absorb moisture, and its water resistance is significantly better than UF resin and PVAc adhesive, effectively solving the problem that UF resin is easy to penetrate the glue; and using solid As an adhesive material, plastic film does not require special gluing equipment, which simplifies the production process of veneer veneer and improves production efficiency; the main component of solid plastic film is polyethylene, and there is no free formaldehyde pollution.

(2) The plastic film of the present invention can be derived from agricultural mulch film, recycled courier bags, garbage bags, food bags, etc., which provides a new path for the recycling of waste plastic films and is more environmentally friendly.

(3) In the present invention, the prepared slab is put into a hot press machine for hot pressing treatment. When the temperature is too high, the water vapor pressure in the slab increases, and the basic unit of the base material is prone to produce Process defects such as bubbling make it difficult to release the temperature inside the board during the board stacking process, resulting in thermal decomposition of the adhesive layer; high temperature of the wood-based board can easily cause deformation of the board. Considering the above reasons, setting the hot pressing temperature of the hot press at 130-160°C will not have adverse effects on the physical and mechanical properties of the wood-based panel substrate. In addition, veneer veneer belongs to the secondary processing of wood-based panels. In the process of hot-pressing veneer, the adhesive in the wood-based panel substrate will be pyrolyzed if the temperature is too high, the glued interface will be damaged, and the mechanical properties of the wood-based panel substrate will be reduced.

Description of drawings

Fig. 1 is a structural schematic diagram of a formaldehyde-free dry glue-free double-sided veneer veneer decorative board according to the present invention.

Fig. 2 is a structural schematic diagram of a formaldehyde-free dry glue-free single-sided veneer veneer decorative board according to the present invention.

Reference signs: wood-based panel substrate layer-1; plastic film-2; veneer surface board-3.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

Example 1

(1) Base material preparation: select plywood with a moisture content of 8% to 12% as the base material layer, repair the base material with knots, cracks and resin capsules, and then polish and sand the base material. The thickness of the light treatment is controlled below 0.3mm, and the thickness deviation of the substrate is controlled within 0.1-0.2mm. Remove the pre-cured layer on the surface of the substrate to make the surface of the substrate smooth and uniform in thickness. Then, according to the size of the wood-based panel substrate, select Thickness of 0.4mm, moisture content of 8% to 12% veneer and veneer cutting and gluing;

(2) Adhesive material selection: choose a pure polyethylene film with a thickness of 0.01mm as the adhesive;

(3) Blank matching: place the plastic film between the veneer and the wood-based panel substrate. The slab is a single-sided veneer slab or a double-sided veneer slab. Balanced, the tree species, thickness, moisture content and grain direction of the veneer on both sides of the substrate are consistent;

(4) Hot pressing: send the slab paved in step (3) into a hot press for hot pressing; the hot pressing temperature of the hot press is 130°C, and the hot pressing time is 0.5min/mm. The pressure is 0.5MPa;

(5) Cold pressing: transfer the hot-pressed slab in step (4) to a cold pressing machine for post-setting treatment. The cold pressing time of the cold pressing machine is 2 minutes, and the cold pressing temperature is 55°C to make veneer Semi-finished surface decorative panels;

(6) Post-processing: Check the quality of the veneer glue on the semi-finished decorative board after the cold pressing. If there is oil or rust on the surface of the veneer, use low-concentration oxalic acid, alcohol or ether to clean the surface of the veneer; Put the semi-finished veneer veneer decorative board under natural conditions for 8 to 48 hours to eliminate thermal stress, and then perform sawing and sanding in turn to form a dry glue-free formaldehyde-free veneer veneer decorative board.

Example 2

(1) Substrate preparation: choose joinery boards with a moisture content of 8% to 12% as the substrate layer, repair the substrate with knots, cracks and resin capsules, and then sand the substrate , the thickness of the sanding treatment is controlled below 0.3mm, the thickness deviation of the substrate is controlled within 0.1-0.2mm, the pre-cured layer on the surface of the substrate is removed, the surface of the substrate is smooth and the thickness is uniform, and then according to the size of the wood-based panel substrate , choose veneer with a thickness of 0.4mm and a moisture content of 8% to 12%, and cut and glue the veneer;

(2) Adhesive material selection: Use recycled agricultural mulch film or recycled courier bags with a thickness of 0.01mm as the adhesive. Before use, clean the plastic film with clean water and dry it at room temperature;

(3) Blank matching: place the plastic film between the veneer and the wood-based panel substrate. The slab is a single-sided veneer slab or a double-sided veneer slab. Balanced, the tree species, thickness, moisture content and grain direction of the veneer on both sides of the substrate are consistent;

(4) Hot pressing: send the slab paved in step (3) into a hot press for hot pressing; the hot pressing temperature of the hot press is 140°C, and the hot pressing time is 0.5min/mm, The pressure is 0.6MPa;

(5) Cold pressing: transfer the hot-pressed slab in step (4) to a cold pressing machine for post-setting treatment. The cold pressing time of the cold pressing machine is 2 minutes, and the cold pressing temperature is 45°C to make veneer Semi-finished surface decorative panels;

(6) Post-processing: Check the quality of the veneer glue on the semi-finished decorative board after the cold pressing. If there is oil or rust on the surface of the veneer, use low-concentration oxalic acid, alcohol or ether to clean the surface of the veneer; Put the semi-finished veneer veneer decorative board under natural conditions for 8 to 48 hours to eliminate thermal stress, and then perform sawing and sanding in turn to form a dry glue-free formaldehyde-free veneer veneer decorative board.

Example 3

(1) Substrate preparation: choose particleboard with a moisture content of 8% to 12% as the substrate layer, repair the substrate with knots, cracks and resin capsules, and then sand the substrate. The thickness of the light treatment is controlled below 0.3mm, and the thickness deviation of the substrate is controlled within 0.1-0.2mm. Remove the pre-cured layer on the surface of the substrate to make the surface of the substrate smooth and uniform in thickness. Then, according to the size of the wood-based panel substrate, select Thickness is 0.5mm, moisture content is 8% ~ 12% veneer and the veneer is cut and glued together;

(2) Adhesive material selection: choose a pure polyethylene film with a thickness of 0.06mm as the adhesive;

(3) Blank matching: place the plastic film between the veneer and the wood-based panel substrate. The slab is a single-sided veneer slab or a double-sided veneer slab. Balanced, the tree species, thickness, moisture content and grain direction of the veneer on both sides of the substrate are consistent;

(4) Hot pressing: send the slab paved in step (3) into a hot press for hot pressing; the hot pressing temperature of the hot press is 150°C, the hot pressing time is 1min/mm, and the hot pressing pressure is 1 MPa;

(5) Cold pressing: transfer the hot-pressed slab in step (4) to a cold pressing machine for post-setting treatment. The cold pressing time of the cold pressing machine is 5 minutes, and the cold pressing temperature is 35°C to make veneer Semi-finished surface decorative panels;

(6) Post-processing: Check the quality of the veneer glue on the semi-finished decorative board after the cold pressing. If there is oil or rust on the surface of the veneer, use low-concentration oxalic acid, alcohol or ether to clean the surface of the veneer; Put the semi-finished veneer veneer decorative board under natural conditions for 8 to 48 hours to eliminate thermal stress, and then perform sawing and sanding in turn to form a dry glue-free formaldehyde-free veneer veneer decorative board.

Example 4

(1) Substrate preparation: select medium density fiberboard with a moisture content of 8% to 12% as the substrate layer, repair the substrate with knots, cracks and resin capsules, and then sand the substrate , the thickness of the sanding treatment is controlled below 0.3mm, the thickness deviation of the substrate is controlled within 0.1-0.2mm, the pre-cured layer on the surface of the substrate is removed, the surface of the substrate is smooth and the thickness is uniform, and then according to the size of the wood-based panel substrate , choose veneer with a thickness of 0.6mm and a moisture content of 8% to 12%, and cut and glue the veneer;

(2) Adhesive material selection: choose a pure polyethylene film with a thickness of 0.1mm as the adhesive;

(3) Blank matching: place the plastic film between the veneer and the wood-based panel substrate. The slab is a single-sided veneer slab or a double-sided veneer slab. Balanced, the tree species, thickness, moisture content and grain direction of the veneer on both sides of the substrate are consistent;

(4) Hot pressing: send the slab paved in step (3) into a hot press for hot pressing; the hot pressing temperature of the hot press is 160°C, the hot pressing time is 1.5min/mm, The pressure is 1.5MPa;

(5) Cold pressing: transfer the hot-pressed slab in step (4) to a cold pressing machine for post-setting treatment. The cold pressing time of the cold pressing machine is 10 minutes, and the cold pressing temperature is 25°C to make veneer Semi-finished surface decorative panels;

(6) Post-processing: Check the quality of the veneer glue on the semi-finished decorative board after the cold pressing. If there is oil or rust on the surface of the veneer, use low-concentration oxalic acid, alcohol or ether to clean the surface of the veneer; Put the semi-finished veneer veneer decorative board under natural conditions for 8 to 48 hours to eliminate thermal stress, and then perform sawing and sanding in turn to form a dry glue-free formaldehyde-free veneer veneer decorative board.

A formaldehyde-free dry glue-free veneer veneer decorative board produced by the dry glue-free formaldehyde-free veneer veneer decorative board production process described in Examples 1 to 4, comprising a wood-based panel base layer 1, said The decorative panel is a double-sided veneer veneer decorative panel as shown in Figure 1; the double-sided veneer veneer decorative panel also includes a plastic film 2 and a veneer surface plate 3, and the veneer surface plate 3 is placed on the wood-based panel substrate On the upper and lower surfaces of the layer 1, the plastic film 2 is flatly spread between the veneer surface board 3 and the base material layer 1 of the wood-based panel. In order to meet the needs of different consumer groups, the decorative board can also be the dry glue formaldehyde-free single-sided veneer veneer decorative board shown in accompanying drawing 2, and the single-sided veneer veneer decorative board also includes plastic film 2 and A veneer surface plate 3, the veneer surface plate 3 is placed on one of the upper and lower sides of the wood-based panel base material layer 1, and the plastic film 2 is flatly spread between the veneer surface plate 3 and the wood-based panel base material layer 1.

In Examples 1-4, a solid plastic film is used as the adhesive material. The plastic film itself does not absorb moisture, and its water resistance is significantly better than that of UF resin and PVAc adhesives, which effectively solves the problem that UF resin is easy to penetrate the glue; and Using solid plastic film as the adhesive material does not require special gluing equipment, which simplifies the production process of veneer veneer and improves production efficiency; the main component of solid plastic film 2 is polyethylene, free of free formaldehyde pollution and the above-mentioned Plastic film can be derived from agricultural mulch film, recycled courier bags and garbage bags, food bags, etc., which provides a new path for the recycling of waste plastic film and is more environmentally friendly. In the present invention, the finished slab is put into a hot press machine for hot pressing treatment. When the temperature is too high, the water vapor pressure in the board increases, and the basic unit of the base material is prone to bubbling due to hindering the migration of water. Process defects make it difficult to release the temperature inside the panel during the stacking process, resulting in thermal decomposition of the adhesive layer; high temperature of the wood-based panel can easily cause deformation of the panel. Considering the above reasons, setting the hot pressing temperature of the hot press at 130-160°C will not have adverse effects on the physical and mechanical properties of the wood-based panel substrate. In addition, veneer veneer belongs to the secondary processing of wood-based panels. In the process of hot-pressing veneer, the adhesive in the wood-based panel substrate will be pyrolyzed if the temperature is too high, the glued interface will be damaged, and the mechanical properties of the wood-based panel substrate will be reduced.

The decorative boards prepared in Examples 1-4 were compared with the decorative boards required by national standards in terms of surface bonding strength and immersion peeling. Table 1 shows the comparison results of the physical and chemical properties of the decorative board described in the present invention and the decorative board required by the national standard. The comparison results show that the physical and mechanical properties of the veneered wood-based panel using plastic film as the adhesive material in the present invention meet the requirements of the national standard.

Table 1 Comparison of the physical and chemical properties of the veneer decorative board made by Examples 1-4 of the present invention and the national standard decorative board

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (6)

1. a dry glue formaldehyde-free coating veneer veneer decorative board production process is characterized in that, comprising the steps: (1) Base material preparation: select wood-based panels as the base material layer, repair the base material with knots, cracks and resin capsules, then polish and sand the base material to remove the pre-cured layer on the surface of the base material, Make the surface of the substrate smooth and uniform in thickness, and then cut and glue the veneer according to the size of the wood-based panel substrate; (2) Adhesive material selection: Use formaldehyde-free plastic film as the adhesive. If recycled plastic film is used as the adhesive, clean the plastic film with clean water and dry it at room temperature before use; (3) Blank matching: place the plastic film between the veneer and the wood-based panel substrate. The slab is a single-sided veneer slab or a double-sided veneer slab. Balanced, the tree species, thickness, moisture content and grain direction of the veneer on both sides of the substrate are consistent; (4) Hot pressing: send the slab paved in step (3) into a hot press for hot pressing; the hot pressing temperature of the hot press is 130-160°C, and the hot-pressing time is 0.5-1.5min. mm ^-1 , the hot pressing pressure is 0.5~1.5MPa; (5) cold pressing: the slab after hot pressing in the step (4) is transferred to the cold press and carried out the post-sizing treatment to make a veneer veneer decorative board semi-finished product; (6) Post-processing: Check the quality of the veneer glue on the semi-finished decorative board after the cold pressing. If there is oil or rust on the surface of the veneer, use low-concentration oxalic acid, alcohol or ether to clean the surface of the veneer; Put the semi-finished veneer veneer decorative board under natural conditions for 8 to 48 hours to eliminate thermal stress, and then perform sawing and sanding in turn to form a dry glue-free formaldehyde-free veneer veneer decorative board. 2. A kind of dry glue-free formaldehyde-free coating veneer veneer decorative board production process according to claim 1 is characterized in that: in step (1), the sanding treatment thickness is controlled below 0.3mm, and the thickness of the base material The deviation is controlled at 0.1~0.2mm. 3. a kind of dry glue-free formaldehyde-free coating veneer veneer decorative board production process according to claim 1 is characterized in that: in step (1), the used wood-based board base material of described wood-based board base material layer is One of plywood, medium density fiberboard, particleboard, blockboard; in step (2), the plastic film is pure polyethylene film, reclaimed agricultural mulch film, reclaimed courier bags, garbage bags, food bags A sort of. 4. A dry glue-free formaldehyde-free coating veneer veneer decorative board production process according to claim 3, characterized in that: the moisture content of the base material of the wood-based panel is 8% to 12%; the thickness of the veneer is The thickness of the plastic film is 0.4-0.6mm, and the water content is 8%-12%. The thickness of the plastic film is 0.01mm-0.1mm. 5. A dry glue-free formaldehyde-free coating veneer decorative board production process according to claim 1, characterized in that: in step (5), the cold pressing time of the cold press is 2 to 10 minutes, and the cold pressing temperature It is 25～55℃. 6. A decorative panel made by the dry glue-free formaldehyde-free coating thin wood veneer decorative panel production process as described in any one of claims 1-5, characterized in that: it includes a wood-based panel base layer, and the decorative panel The board is divided into a double-sided veneer veneer decorative board and a single-sided veneer veneer decorative board; the double-sided veneer veneer decorative board also includes a plastic film and a veneer surface plate, and the veneer veneer surface plate is placed on the base layer of the wood-based panel On the upper and lower surfaces, the plastic film is tiled between the veneer surface board and the wood-based panel substrate layer; the single-sided veneer veneer decorative board also includes a plastic film and a veneer surface board, and the veneer surface board is placed on the wood-based board base On one side of the upper and lower sides of the wood layer, the plastic film is laid flat between the veneer surface board and the wood-based board base layer.