A method for manufacturing technical wood with a concave-convex stripe texture capable of producing a three-dimensional relief effect

Abstract

The present application belongs to the technical field of technology wood manufacturing, and particularly relates to a technology wood manufacturing method capable of producing a three-dimensional embossing effect concave-convex strip texture. The present application aims at the problem that the existing technology has its own limitations in producing the embossing effect concave-convex texture pattern. The present application utilizes the feature that the tangential wet swelling of wood is obviously greater than the radial wet swelling, and provides a technology wood manufacturing method capable of producing a three-dimensional embossing effect concave-convex strip texture. The method comprises the steps of rotary cutting a single board, pressing to form a first wood frame, forming a relatively thick slice and a relatively thin slice by laterally cutting the frame, alternately stacking and layering the relatively thick slice and the relatively thin slice to press a second wood frame, laterally cutting the frame, abutting, planing, attaching to the surface of a base material, and then carrying out a humidification treatment and a drying and shaping. The technical scheme provided by the present application can produce the concave-convex texture on any plane and curved surface that can be attached, and does not require special equipment.

Description

Technical Field

[0001] This invention belongs to the field of engineered wood manufacturing technology, and in particular relates to a method for manufacturing engineered wood that can produce a three-dimensional relief effect with concave and convex striped textures. Background Technology

[0002] Currently, the main technical solutions for creating embossed textured patterns on wood decorative panels are as follows: 1. To mill out the relief texture surface with a carving machine, solid wood boards or wood veneer panels with a thickness of 2mm or more are generally required to mill out the concave and convex texture surface. Special equipment is required. Due to the limitations of the shape and size of the cutting tools, if details need to be expressed, the efficiency is low and the cost is high. 2. Pressing embossed stainless steel sheets onto a hot press requires specialized high-pressure equipment in conjunction with the high-temperature pressing of the embossed sheet. It requires relatively thick wood veneer or to be pressed onto a low-density substrate board. It can create embossed products with special effects, but the colors and textures are difficult to match, and it can only produce flat decorative parts. 3. Using a carving embossing roller to simultaneously heat and press the texture can only press the texture on a flat surface, and cannot match the original color and structure of the wood. Generally, the texture is also relatively stiff. 4. On melamine-impregnated paper-faced engineered wood panels (commonly known as melamine-faced boards or eco-boards), embossed stainless steel plates are used to etch slender grooves resembling the pores of natural wood. Previously, the printed texture and color were independent of the grooves, resulting in a somewhat artificial appearance. At the beginning of this century, companies in Europe began using "synchronous grain matching embossing technology," precisely aligning the raised and recessed patterns of the embossing template with the printed texture pattern. This creates a three-dimensional, realistic wood grain effect on the board surface, effectively mimicking the open-pore texture of solid wood and significantly enhancing the visual and tactile realism. The core of this "synchronous grain matching" technology lies in using a high-definition imaging system and precise positioning equipment to synchronously overlap the texture on the printed wood grain paper with the texture on the hot-pressing steel template. This equipment is extremely expensive. 5. A wire-brushing process is used for wood surface treatment, typically employing a stainless steel brush or wire-brushing machine. Dense steel wires are repeatedly brushed along the grain (fiber direction) of the wood, removing the softer parts and creating fine, elongated grooves on the surface. These unevenly sized, long grooves add depth and dimension. If the board is subsequently stained or sanded, the colored pigments (including white) filling the grooves are retained, while the smooth areas are sanded away, achieving a unique decorative effect. However, only a limited number of wood species produce a good wire-brushing effect; it requires wood with significant differences in earlywood / latewood or density.

[0003] The above technologies either require expensive specialized equipment (such as the "synchronous texture embossing technology" in melamine-impregnated paper-faced engineered wood), or the colors and textures cannot be aligned (such as using embossed stainless steel plates to press concave and convex textures onto engineered wood, or using engraving machines to mill concave and convex textures), or they are inefficient and costly (milling concave and convex textures with engraving machines), or they can only produce striped grooves without continuous raised stripe effects (such as embossing of melamine-impregnated paper-faced engineered wood or brushing of natural leather). Each of these technologies has its limitations. Therefore, there is a need for a low-cost, equipment-free engineered wood manufacturing method that can be applied to curved surfaces and produce natural, rugged, three-dimensional embossed textures. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a method for manufacturing engineered wood that does not require specialized relief carving equipment, is low in cost, is applicable to both flat and curved surfaces, and can naturally form a three-dimensional relief effect with raised and recessed striped textures.

[0005] The core of this invention lies in utilizing the anisotropic characteristic of wood, where the tangential swelling rate is approximately twice the radial swelling rate. During the manufacturing process of engineered wood, a specific multi-stage molding process is used to intentionally create different angles between the original veneer grain directions (tangential and radial) of adjacent striped areas relative to the slice surface in the final engineered wood slab. In the wide-grained areas, the original veneer grain direction is approximately perpendicular to the slice surface in the tangential direction, while in the narrow-grained areas, the original veneer grain direction is almost perpendicular to the slice surface in the radial direction. Finally, after veneer application, humidification methods such as water spraying cause areas with high tangential component to bulge significantly due to their high swelling rate, while areas with high radial component experience less swelling and thus form relative depressions. The adhesive layer's restrictive effect allows the swelling deformation to be retained after subsequent drying, thereby naturally forming a continuous, textured, three-dimensional striped grain.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: A method for manufacturing engineered wood that produces a three-dimensional embossed texture, characterized by the following steps: Step 1: The wood segments are rotary-cut to obtain rotary-cut veneers, which are then bleached, dyed, and dried. After being coated with adhesive, they are laminated and pressed to form primary timber. Step 2: The primary timber obtained in Step 1 is cut open at an angle to the horizontal plane with the length direction as the axis of rotation. The two parts are then glued together and cut into slices of two different thicknesses. Step 3: Keep the thicker slice from Step 2 in the original direction it was cut from the primary timber, then rotate the thinner slice from Step 2 horizontally by 180 degrees and stack it on the surface of the thicker slice. Alternately stack the thicker and thinner slices, apply adhesive, and press them together to form a secondary timber. Step 4: Split the secondary timber. The splitting angle of the secondary timber is exactly the same as that of the primary timber, and the splitting direction is parallel to the tangential direction of the thinner slice. Then, the two parts obtained after splitting are joined together with adhesive and planed to obtain engineered wood finished slices.

[0007] The finished engineered wood veneer has an internal structure with alternating wide and narrow grain areas. The original veneer grain direction corresponding to the wide grain area is approximately perpendicular to the veneer surface in the tangential direction, and the original veneer grain direction corresponding to the narrow grain area is approximately perpendicular to the veneer surface in the radial direction.

[0008] In the above-mentioned method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped textures, in step one, wood segments with a tangential wet expansion ratio of 1.7 or higher are selected.

[0009] In the above-mentioned method for manufacturing engineered wood that produces a three-dimensional relief effect with raised and recessed striped textures, the thickness of the rotary-cut veneer in step one is 0.65-0.9mm.

[0010] In the above-mentioned method for manufacturing engineered wood that produces a three-dimensional relief effect with raised and recessed striped textures, the moisture content of the rotary-cut veneer after drying in step one is 8-14%.

[0011] In the aforementioned method for manufacturing engineered wood that produces a three-dimensional embossed texture, the adhesive used in step one is a urea-formaldehyde resin adhesive with a solid content of 55-60%, and the adhesive application rate is 140-160 g / m². 2 .

[0012] In the above-mentioned method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture, the included angle of the oblique lateral cutting in step two is 18-30 degrees.

[0013] In the above-mentioned method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture, the thickness ratio of the thick slice to the thin slice in step two is 2-4:1.

[0014] In the above-mentioned method for manufacturing engineered wood that produces a three-dimensional embossed texture, the adhesive used in step three is a urea-formaldehyde resin adhesive with a solid content of 55-60%, and the adhesive application rate is 200-240 g / m². 2 .

[0015] In the above-mentioned method for manufacturing engineered wood that can produce a three-dimensional relief effect with concave and convex striped textures, the joining process in steps two and four is as follows: the upper half obtained after splitting the plank is rotated and moved to the lower half, so that the original upper surface of the upper half is attached to the lower surface of the lower half, and the original cross-section becomes the upper and lower surfaces to form a new plank; the planing direction in step four is horizontal, and the thickness of the finished slice is 0.45-1.0mm.

[0016] The aforementioned method for manufacturing engineered wood with a three-dimensional relief effect and raised striped texture further includes the step of applying engineered wood slices: after attaching the engineered wood slices obtained in step four to the surface of a substrate, they are humidified, causing the surface to form a three-dimensional raised striped texture due to the difference in moisture expansion between the wide and narrow striped areas. Subsequently, drying, shaping, and surface treatment are performed to obtain a three-dimensional relief engineered wood decorative component. The component can be a flat panel, a curved shape, or an injection-molded part.

[0017] Compared with existing technologies, the advantages of this invention are: 1. The present invention achieves the following through process steps: adjacent veneer layers of the finished engineered wood slab have different orientations. One layer has a high tangential component facing the cut surface, while the other layer is almost radial. Finally, at the application end, measures such as water spraying are used to take advantage of the characteristic that the tangential expansion of the wood segment is significantly greater than that of the radial expansion. The adhesive layer restricts them from each other, and the expanded parts cannot shrink back to their original shape even after drying. This results in a natural textured pattern. Therefore, the technical solution provided by the present invention can produce textured patterns on any flat or curved surface that can be bonded, without the need for special equipment.

[0018] 2. The embossed texture of the present invention relies on the wood’s own swelling characteristics and the pre-set structure. At the application end, only simple water spraying is required, which saves the need for expensive special equipment such as relief steel molds, embossing rollers, and precision positioning systems.

[0019] 3. The texture formed by this invention is based on the natural deformation of the wood structure. It is a continuous three-dimensional stripe with both grooves and raised areas, which is more natural and three-dimensional than simply pressing grooves or drawing grooves.

[0020] 4. This invention is not only applicable to flat sheet metal veneer, but also to curved surfaces, irregularly shaped injection molded parts, and other scenarios. It perfectly solves the industry problem of difficult processing three-dimensional textures on curved workpieces, and expands its application in automotive interiors, furniture curved surfaces and other fields.

[0021] 5. The core process of this invention is completed in the engineered wood manufacturing stage, and there are no special requirements for subsequent application-end production processes such as veneer, spraying, and injection molding, making it easy to promote. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the rotary cutting process for wood segments; Figure 2 This is a schematic diagram of the process of splitting a timber beam. Figure 3 This is a schematic diagram of the joining and planing of timber after secondary splitting; Figure 4 This is a partial schematic diagram of the secondary timber beam being split. Figure 5 This is a diagram showing the state of the engineered wood chips after they have been sprayed with water and swelled in Example 1. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0024] Example 1

[0025] This embodiment provides a method for manufacturing engineered wood that can produce a three-dimensional embossed texture with raised stripes, combined with... Figure 1-4 As shown, it includes the following steps: Step 1: The wood segments are rotary-cut to obtain rotary-cut veneers with a thickness of 0.9 mm. After bleaching, staining, and drying, the moisture content after drying is 12%. Then, an adhesive is applied and the veneers are laminated and pressed to form primary timber. The adhesive is a urea-formaldehyde resin with a solid content of 60%, and the adhesive application rate is 160 g / m². 2 ; Step 2: Cut the primary timber obtained in Step 1 at a 25-degree angle to the horizontal plane and slice it into pieces with thicknesses of 0.95mm and 0.25mm respectively. Step 3: Keeping the 0.95mm thick slice from Step 2 in its original orientation as it was cut from the primary timber, rotate the 0.25mm thick slice from Step 2 horizontally 180 degrees and stack it on top of the 0.95mm thick slice. Alternately stack the 0.95mm and 0.25mm thick slices, apply adhesive, and press them together to form a secondary timber. The adhesive is a 58% solids urea-formaldehyde resin, with an application rate of 240g / m². 2 ; Step 4: Split the secondary timber. The splitting angle of the secondary timber is exactly the same as that of the primary timber, and the splitting direction is parallel to the tangential direction of the thinner slice. Then, join the two parts obtained after splitting and plan them horizontally to obtain engineered wood finished slices with a thickness of 0.6mm. Step 5: At the application end, after attaching the engineered wood slices obtained in Step 4 to the substrate, the surface is humidified. Utilizing the characteristic that wood expands more in the tangential direction than in the radial direction when wetted, a three-dimensional striped texture with alternating concave and convex patterns is formed on the surface. Subsequently, drying, shaping, and surface treatment are performed to obtain three-dimensional relief engineered wood. (The three-dimensional relief engineered wood is shown in the image.) Figure 5 As shown.

[0026] In this embodiment, the timber used is linden wood, and the ratio of tangential to radial swelling of the linden wood is between 1.7 and 2.1.

[0027] The joining process in steps two and four is as follows: The upper half obtained after splitting the timber is rotated and moved below the lower half, so that the original upper surface of the upper half fits against the lower surface of the lower half, making the original cross-section the upper and lower surfaces, thus forming a new timber. Figure 3 As shown, after docking, surface A moves to the surface of the timber, while surface B moves to the cut.

[0028] Example 2

[0029] This embodiment provides a method for manufacturing engineered wood that can produce a three-dimensional embossed texture with raised stripes, combined with... Figure 1-4 As shown, it includes the following steps: Step 1: The wood segments are rotary-cut to obtain rotary-cut veneers with a thickness of 0.9 mm. After bleaching, staining, and drying, the moisture content after drying is 10%. Then, an adhesive is applied and the veneers are laminated and pressed to form primary timber. The adhesive is a urea-formaldehyde resin with a solid content of 55%, and the adhesive application rate is 140 g / m². 2 ; Step 2: Cut the primary timber obtained in Step 1 at a 20-degree angle to the horizontal plane and slice it into pieces with thicknesses of 0.70mm and 0.30mm respectively. Step 3: Keeping the 0.70mm thick slice from Step 2 in its original orientation as it was cut from the primary timber, rotate the 0.30mm thick slice from Step 2 horizontally 180 degrees and overlap it on the surface of the 0.70mm thick slice. Alternately stack the 0.70mm and 0.30mm thick slices, apply adhesive, and press them together to form a secondary timber. The adhesive is a 55% solids urea-formaldehyde resin, with an application rate of 200g / m². 2 ; Step 4: Split the secondary timber. The splitting angle of the secondary timber is exactly the same as that of the primary timber, and the splitting direction is parallel to the tangential direction of the thinner slice. Then, join the two parts obtained after splitting and plan them horizontally to obtain engineered wood finished slices with a thickness of 0.5mm. Step 5: On the application side, after attaching the engineered wood slices obtained in Step 4 to the substrate, the surface is humidified. Taking advantage of the characteristic that wood expands more in the tangential direction than in the radial direction, a three-dimensional striped texture with alternating concave and convex sections is formed on the surface. Then, drying, shaping and surface treatment are carried out to obtain three-dimensional relief engineered wood.

[0030] In this embodiment, the timber used is linden wood, and the ratio of tangential to radial swelling of the linden wood is between 1.7 and 2.1.

[0031] The joining process in steps two and four is as follows: The upper half obtained after splitting the timber is rotated and moved below the lower half, so that the original upper surface of the upper half fits against the lower surface of the lower half, making the original cross-section the upper and lower surfaces, thus forming a new timber. Figure 3 As shown, after docking, surface A moves to the surface of the timber, while surface B moves to the cut.

[0032] Example 3

[0033] This embodiment provides a method for manufacturing engineered wood that can produce a three-dimensional embossed texture with raised stripes, combined with... Figure 1-4 As shown, it includes the following steps: Step 1: The wood segments are rotary-cut to obtain rotary-cut veneers with a thickness of 0.9 mm. After bleaching, staining, and drying, the moisture content after drying is 14%. Then, an adhesive is applied and the veneers are laminated and pressed to form primary timber. The adhesive is a urea-formaldehyde resin with a solid content of 58%, and the adhesive application rate is 160 g / m². 2 ; Step 2: Cut the primary timber obtained in Step 1 at a 25-degree angle to the horizontal plane and slice it into pieces with thicknesses of 0.95mm and 0.25mm respectively. Step 3: Keeping the 0.95mm thick slice from Step 2 in its original orientation as it was cut from the primary timber, rotate the 0.25mm thick slice from Step 2 horizontally 180 degrees and stack it on top of the 0.95mm thick slice. Alternately stack the 0.95mm and 0.25mm thick slices, apply adhesive, and press them together to form a secondary timber. The adhesive is a 58% solids urea-formaldehyde resin, with an application rate of 240g / m². 2 ; Step 4: Split the secondary timber. The splitting angle of the secondary timber is exactly the same as that of the primary timber, and the splitting direction is parallel to the tangential direction of the thinner slice. Then, join the two parts obtained after splitting and plan them horizontally to obtain engineered wood finished slices with a thickness of 0.6mm. Step 5: On the application side, after attaching the engineered wood slices obtained in Step 4 to the substrate, the surface is humidified. Taking advantage of the characteristic that wood expands more in the tangential direction than in the radial direction, a three-dimensional striped texture with alternating concave and convex sections is formed on the surface. Then, drying, shaping and surface treatment are carried out to obtain three-dimensional relief engineered wood.

[0034] In this embodiment, the timber used is linden wood, and the ratio of tangential to radial swelling of the linden wood is between 1.7 and 2.1.

[0035] The joining process in steps two and four is as follows: The upper half obtained after splitting the timber is rotated and moved below the lower half, so that the original upper surface of the upper half fits against the lower surface of the lower half, making the original cross-section the upper and lower surfaces, thus forming a new timber. Figure 3 As shown, after docking, surface A moves to the surface of the timber, while surface B moves to the cut.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims. Reasonable adjustments made by those skilled in the art to the described specific embodiments, such as to the wood species, adhesive type, molding times, or process parameters, under the concept of this invention, should all be included within the protection scope of this invention.

Claims

1. A method for manufacturing engineered wood that produces a three-dimensional relief-like textured surface, characterized in that, Includes the following steps: Step 1: The wood segments are rotary-cut to obtain rotary-cut veneers, which are then bleached, dyed, and dried. After being coated with adhesive, they are laminated and pressed to form primary timber. Step 2: The primary timber obtained in Step 1 is cut open at an angle to the horizontal plane with the length direction as the axis of rotation. The two parts are then glued together and cut into slices of two different thicknesses. Step 3: Keep the thicker slice from Step 2 in the original direction it was cut from the primary timber, then rotate the thinner slice from Step 2 horizontally by 180 degrees and stack it on the surface of the thicker slice. Alternately stack the thicker and thinner slices, apply adhesive, and press them together to form a secondary timber. Step 4: Split the secondary timber. The splitting angle of the secondary timber is exactly the same as that of the primary timber, and the splitting direction is parallel to the tangential direction of the thinner slice. Then, the two parts obtained after splitting are joined together with adhesive and planed to obtain engineered wood finished slices.

2. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped textures as described in claim 1, characterized in that: In step one, select wood segments with a tangential swelling to radial swelling ratio of 1.7 or higher.

3. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped textures as described in claim 1, characterized in that: The thickness of the veneer in step one is 0.65-0.9mm.

4. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped textures as described in claim 1, characterized in that: In step one, the moisture content of the rotary-cut veneer after drying is 8-14%.

5. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture as described in claim 1, characterized in that: In step one, the adhesive is a urea-formaldehyde resin adhesive with a solid content of 55-60%, and the application rate is 140-160 g / m³. 2 .

6. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture as described in claim 1, characterized in that: The included angle of the oblique lateral cut in step two is 18-30 degrees.

7. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture as described in claim 1, characterized in that: In step two, the thickness ratio of the thick slice to the thin slice is 2-4:

1.

8. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with concave and convex striped textures as described in claim 1, characterized in that: The adhesive used in step three is a urea-formaldehyde resin adhesive with a solid content of 55-60%, and the application rate is 200-240 g / m³. 2 .

9. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture as described in claim 1, characterized in that: The joining process in steps two and four is as follows: the upper half obtained after splitting the timber is rotated and moved below the lower half, so that the original upper surface of the upper half is attached to the lower surface of the lower half, and the original cross-section becomes the upper and lower surfaces to form a new timber; the planing direction in step four is horizontal, and the thickness of the finished slice is 0.45-1.0mm.

10. The method for manufacturing engineered wood that can produce a three-dimensional relief effect with raised and recessed striped texture as described in claim 1, characterized in that: It also includes the step of applying engineered wood finished product slices: after attaching the engineered wood finished product slices obtained in step four to the surface of the substrate, it is humidified so that the surface forms a three-dimensional striped texture with alternating concave and convex patterns due to the difference in moisture expansion between the wide and narrow grain areas. Then, it is dried, shaped and surface treated to obtain a three-dimensional relief engineered wood decorative component.

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