CN114161705A - 3D printing forming and post-processing method of wood fiber biomass material - Google Patents

3D printing forming and post-processing method of wood fiber biomass material Download PDF

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Publication number
CN114161705A
CN114161705A CN202111495994.5A CN202111495994A CN114161705A CN 114161705 A CN114161705 A CN 114161705A CN 202111495994 A CN202111495994 A CN 202111495994A CN 114161705 A CN114161705 A CN 114161705A
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China
Prior art keywords
printing
powder
post
forming
printing material
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Pending
Application number
CN202111495994.5A
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Chinese (zh)
Inventor
闫承琳
刘�东
李晓旭
刘子昕
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Research Institute of Wood Industry of Chinese Academy of Forestry
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Research Institute of Wood Industry of Chinese Academy of Forestry
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Application filed by Research Institute of Wood Industry of Chinese Academy of Forestry filed Critical Research Institute of Wood Industry of Chinese Academy of Forestry
Priority to CN202111495994.5A priority Critical patent/CN114161705A/en
Publication of CN114161705A publication Critical patent/CN114161705A/en
Priority to ZA2022/13238A priority patent/ZA202213238B/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/264—Arrangements for irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/307—Handling of material to be used in additive manufacturing
    • B29C64/314—Preparation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/307—Handling of material to be used in additive manufacturing
    • B29C64/321—Feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/10—Pre-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials

Abstract

The invention provides a 3D printing forming and post-processing method of a wood fiber biomass material, which comprises the following steps: s1: mixing the wood fiber biomass material and the plastic powder, adding a modifier, and uniformly mixing by high-speed stirring to prepare a printing material; s2: the powder supply cylinder pushes the printing material to rise, and a powder layer surface suitable for printing is formed in the forming cylinder; s3: spraying an adhesive layer by a spray head according to a set path, and curing the adhesive layer until the primary blank is finished; s4: carrying out post-treatment operations such as powder removal, isostatic pressing, coating, wax infiltration and the like on the solidified primary blank by a conveying mechanism or a mechanical arm and the like in sequence; s5: taking out the final formed part and recovering the residual powder. The invention is based on the 3DP process, and has larger molding size. The invention adopts the mode of underneath powder feeding, avoids the problem that the falling powder of the vibrating screen is easy to scatter, and improves the powder laying quality. The post-processing method provided by the invention is combined with the printing procedure to form an integrated process, thereby being beneficial to batch production.

Description

3D printing forming and post-processing method of wood fiber biomass material
Technical Field
The invention relates to the technical field of 3D printing and forming of wood materials, in particular to a 3D printing and forming and post-processing method of a wood fiber biomass material.
Background
Both the preparation of raw materials and the forming process can affect the final forming effect of the 3D printed product. The 3D printing composite material taking the wood fiber biomass material as the base material is processed and formed by technical means such as physics, chemistry and biology, and has the characteristics of excellent performance, energy conservation, environmental protection, complete variety and high added value. The adhesive injection technology (3DP) is an additive manufacturing process combining droplet injection and powder bed forming technologies, is economical and environment-friendly, has a large forming size, and can realize medium and low temperature additive manufacturing of the wood fiber biomass material by utilizing the characteristics of rapid ultraviolet curing, environmental protection and rapid bonding of the liquid adhesive on the powder material in the wood material 3DP process.
Powder paving is an important component of a 3DP process and is one of main parameters influencing the final precision of a formed part, the common powder feeding forms in the 3DP process at present are an upper powder feeding form and a lower powder feeding form, and the powder paving forms comprise a movable hopper type, a scraper type, a roller type and different combinations. In the patent of 'a bamboo-plastic composite material rapid forming method and equipment', the applicant adopts a powder mixing centrifugal tank to store powder, paves a vibrating screen to drop powder and presses the powder by a pressure plate, and belongs to an upper powder feeding mode.
The mechanical strength and the surface quality are both key technical problems in the field of 3D printing of the wood fiber biomass material and are also important factors for restricting the practical application range of the wood fiber biomass material. The initial blank obtained based on the 3DP method is generally low in strength and poor in surface quality, the strength, compactness and surface quality of the initial blank need to be improved through post-treatment, and common post-treatment methods mainly comprise a wax infiltration method, a solidification method, surface spraying and the like.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a 3D printing forming and post-processing method of a wood fiber biomass material, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a 3D printing forming and post-processing method of a wood fiber biomass material, which comprises the following steps:
s1: mixing the wood fiber biomass material and the plastic powder, adding a modifier, and uniformly mixing by high-speed stirring to prepare a printing material;
s2: the powder supply cylinder pushes the printing material to rise, and a powder layer surface suitable for printing is formed in the forming cylinder;
s3: spraying an adhesive by a spray head according to a set path, spraying a layer of adhesive, and irradiating and curing the layer of adhesive by ultraviolet radiation until the primary blank is finished;
s4: sequentially carrying out post-treatment operations of powder removal, isostatic pressing, coating and wax infiltration on the solidified primary blank by a conveying mechanism or a mechanical arm;
s5: taking out the final formed part and recovering the residual powder.
Preferably, step S1 is specifically: firstly, crushing a wood fiber biomass material by a pulverizer, and screening out particle materials with required meshes by using screens with different meshes; secondly, preparing wood fiber biomass material powder and plastic powder into different proportions by using a precision electronic scale for preliminary mixing; and adding a modifier, and uniformly stirring and mixing at a high speed to obtain the printing material.
Preferably, step S2 is specifically: after the prepared printing material is loaded into the powder supply cylinder, the powder supply cylinder stepping motor drives a gear and a lead screw to move through a motor shaft, the lead screw pushes a sleeve to ascend, the sleeve pushes a substrate to bear the printing material to ascend, a displacement sensor accurately displays the moving height, the forming cylinder completes the opposite operation, the forming cylinder stepping motor drives the gear and the lead screw to move through the motor shaft, the lead screw descends, the sleeve descends along with the lead screw, and the substrate bears the printing material and also descends to the set height; the printing material is paved on the surface of the forming cylinder in a one-way mode and is uniformly compacted; after the layer is sprayed, the powder supply cylinder continuously rises, the forming cylinder continuously descends, a new layer of printing material is continuously paved and compacted, and the adhered and rolled excessive printing material is recovered until the spraying is finished.
Preferably, step S3 is specifically: moving the spray head to a set position above the forming cylinder, spraying quantitative adhesive on the surface of the paved printing material in a planned track, and moving the spray head to a non-interference position after spraying a layer of adhesive; a darkroom formed by the shading device moves to a spraying position, ultraviolet rays with certain wavelength are utilized to radiate and illuminate the printing material which is permeated with the adhesive within a set time, and the ultraviolet lamp moves to a non-interference position after being cured; and repeating the operation, laying a layer of printing material, spraying adhesive, and curing by ultraviolet radiation until the primary blank is molded.
Preferably, step S4 is specifically: firstly, cleaning printing materials remained on the surface of a primary blank and in a complex gap by adopting a gas blowing, mechanical cleaning and ultrasonic vibration method for the primary blank with certain strength, and removing powder after reinforcing the primary blank with lower strength by adopting a compressed air and low-temperature preheating method; secondly, improving the overall density of the formed part by adopting a cold isostatic pressing or warm isostatic pressing method, gradually pressurizing through a pressurizing system, and applying equal pressure to each surface of the initial blank; finally, the surface quality of the formed part is improved by adopting a coating and wax infiltration method, a thin layer of reinforcer (such as two-component polyurethane, liquid ultraviolet photosensitive resin and the like) is coated on the surface of the primary blank, or the primary blank is taken out, dried and removed residual wax after being immersed in melted wax for a few seconds.
By adopting the technical scheme, the invention has the following beneficial effects:
1: the wood material additive manufacturing is suitable for wide raw material sources, comprises renewable plant materials such as fast-growing wood, agricultural and forestry wastes and other organic resources including related wastes, has low cost, and is energy-saving and environment-friendly. The 3D printing product made of the wood fiber biomass material has both natural texture of wood and good performance of the filling material.
2: the adhesive injection technology is combined with the ultraviolet curing technology, the molding size is large, and medium and low temperature curing of the wood material is realized.
3: the piezoelectric micro-jet technology is used, the printing speed is high, and the jet viscosity range is wide.
4: the printing process is combined with the post-processing technology, the production period and the labor cost are reduced, and the simplicity and the high efficiency of the 3D printing process are realized.
5: the lower powder feeding mode can more easily ensure the layering thickness and the positioning precision, and the problems of more obvious adhesive permeation and diffusion effects caused by poor powder laying effect can be more easily reduced by firstly laying and compacting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an apparatus flow diagram of a 3D print forming and post-treatment method of lignocellulosic biomass material in accordance with the present invention;
FIG. 2 is a process flow diagram of the 3D printing forming and post-processing method of lignocellulosic biomass material in accordance with the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
With reference to fig. 1-2, the present embodiment provides a 3D printing, forming and post-processing method for lignocellulosic biomass material, applied to a 3DP device, the forming method includes the following steps: s1: mixing the powder of the wood fiber biomass material, the plastic, the additive and the like, adding a proper modifier, and uniformly mixing by high-speed stirring to prepare a printing material; s2: feeding the printing material into a powder supply cylinder, and forming a powder layer surface suitable for printing by a forming cylinder through flattening and compacting; s3: spraying an adhesive on the surface of the uniform powder layer according to a set path by a spray head, curing by ultraviolet radiation illumination, spraying a layer, and curing the layer until the primary blank is finished; s4: sequentially carrying out post-treatment operation on the solidified primary blank as required actually; s5: taking out the final formed part and recovering the residual powder. The method is based on a 3DP process and is not limited by the forming size; the powder feeding mode is adopted, and the powder is firstly spread and compacted, so that the precision of the final formed part is improved; the post-treatment and the printing process are combined, so that the production period is shortened, and the mass production is facilitated. The method is also suitable for other 3DP equipment made of non-metallic materials, including 3DP equipment which independently undertakes printing or post-processing and integrally has printing and post-processing processes.
The invention provides a preparation method of a wooden 3D printing material. Firstly, crushing a wood fiber biomass material by a pulverizer, and screening out particle materials with required meshes by using screens with different meshes; secondly, preparing wood fiber biomass material powder and polyethylene powder into different proportions by using a precision electronic scale for preliminary mixing; and adding a proper amount of modifier, and uniformly stirring and mixing at a high speed to obtain the printing material. The specific parameter settings of wood fiber, plastic, additives, modifiers and the like are required to be completed according to the actual production requirements of the formed parts. The invention provides an embodiment, raw materials: the mass ratio of the wood fiber biomass material to the wood fiber biomass material in the plastic powder mixture is as follows: 10%, 20%, 40% or 100%; mesh number of lignocellulosic biomass material: 60 meshes, 100 meshes or 120 meshes; the modifier is maleic anhydride, and the mass ratio of the modifier to the wood fiber biomass material is as follows: 1 to 4 percent.
The invention provides a unidirectional powder laying method for underneath powder feeding. After the prepared printing material is loaded into the powder supply cylinder, the powder supply cylinder stepping motor drives a gear and a lead screw to move through a motor shaft, the lead screw pushes a sleeve to ascend, the sleeve pushes a substrate to bear the printing material to ascend, a displacement sensor accurately displays the moving height, the forming cylinder completes the opposite operation, the forming cylinder stepping motor drives the gear and the lead screw to move through the motor shaft, the lead screw descends, the sleeve descends along with the lead screw, and the substrate bears the printing material and also descends to the set height; the printing material is paved on the surface of the forming cylinder in a one-way mode and is uniformly compacted; after the layer is sprayed, the powder supply cylinder continuously rises, the forming cylinder continuously descends, a new layer of printing material is continuously paved and compacted, and the adhered and rolled excessive printing material is recovered until the spraying is finished. The powder spreading method provided by the invention is exemplified by the provided 3DP equipment, and is particularly influenced by the powder spreading structure, the size of a powder cylinder, a forming space and the like in the printing equipment, and the uniform and flat surface of the powder layer is the final purpose of all powder spreading designs. The invention provides an embodiment, the layering height: 0.5mm, blade speed: 20mm/s, roller diameter: 32 mm.
The present invention provides a method of printing blanks by drop-on-demand and darkroom curing. Moving the spray head to a set position above the forming cylinder, spraying quantitative adhesive on the surface of the paved printing material in a planned track, and moving the spray head to a non-interference position after spraying a layer of adhesive; a darkroom formed by the shading device moves to a spraying position, ultraviolet rays with certain wavelength are utilized to radiate and illuminate the printing material which is permeated with the adhesive within a set time, and the ultraviolet lamp moves to a non-interference position after being cured; repeating the operation, laying a layer of printing material, spraying adhesive, and curing by ultraviolet radiation until the primary blank is molded; the monitoring device realizes real-time whole-course monitoring of processes of adhesive extrusion, dripping, contact, infiltration, diffusion and the like within the range of 60-180 degrees, and in the whole-course integrated forming and processing process, a real-time monitoring system is cooperated with the monitoring application of printing the quality of a formed part, so that technological parameters of powder laying, spraying, curing and the like can be continuously optimized and improved, the forming process is finally improved, and the quality of the formed part is improved. The invention provides an embodiment, the spray head: piezojet (nozzle diameter 50 μm, jet velocity 10mm/s), adhesive: liquid uv glue (viscosity 600mpa), uv lamp: wavelength range 200-: 30s-1 min.
The invention provides a post-processing method for a joint printing process. After the printing process is finished, the primary blank is moved to an actually required post-processing device through a conveying mechanism or a mechanical arm and the like; firstly, a mechanical cleaning method is adopted, such as an electric brush is used for cleaning printing materials remained on the surface of a primary blank and in a complex gap at a proper rotating speed; secondly, an isostatic pressing method, such as a cold isostatic pressing or warm isostatic pressing technology, is adopted to improve the overall density of the formed part; and finally, improving the surface quality of the formed part by adopting methods such as coating, wax impregnation and the like. The post-treatment method can be selected according to actual needs, and is not limited to the embodiment. The invention provides an embodiment, the mechanical cleaning rotating speed: moderate and small, isostatic pressing temperature: normal temperature or below 80-120 ℃, pressure: about 300MPa, surface treatment: and (5) wax infiltration.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A3D printing forming and post-processing method of a wood fiber biomass material is characterized by comprising the following steps:
s1: mixing the wood fiber biomass material and the plastic powder, adding a modifier, and uniformly mixing by high-speed stirring to prepare a printing material;
s2: the powder supply cylinder pushes the printing material to rise, and a powder layer surface suitable for printing is formed in the forming cylinder;
s3: spraying an adhesive layer by a spray head according to a set path, and curing the adhesive layer until the primary blank is finished;
s4: sequentially carrying out post-treatment operations of powder removal, isostatic pressing, coating and wax infiltration on the solidified primary blank by a conveying mechanism or a mechanical arm;
s5: taking out the final formed part and recovering the residual powder.
2. The 3D printing, forming and post-processing method of lignocellulosic biomass material as claimed in claim 1, wherein the step S1 is specifically: firstly, crushing a wood fiber biomass material by a pulverizer, and screening out particle materials with required meshes by using screens with different meshes; secondly, preparing wood fiber biomass material powder and plastic powder into different proportions by using a precision electronic scale for preliminary mixing; and adding a modifier, and uniformly stirring and mixing at a high speed to obtain the printing material.
3. The 3D printing, forming and post-processing method of lignocellulosic biomass material as claimed in claim 1, wherein the step S2 is specifically: after the prepared printing material is loaded into the powder supply cylinder, the powder supply cylinder stepping motor drives a gear and a lead screw to move through a motor shaft, the lead screw pushes a sleeve to ascend, the sleeve pushes a substrate to bear the printing material to ascend, a displacement sensor accurately displays the moving height, the forming cylinder completes the opposite operation, the forming cylinder stepping motor drives the gear and the lead screw to move through the motor shaft, the lead screw descends, the sleeve descends along with the lead screw, and the substrate bears the printing material and also descends to the set height; the printing material is paved on the surface of the forming cylinder in a one-way mode and is uniformly compacted; after the layer is sprayed, the powder supply cylinder continuously rises, the forming cylinder continuously descends, a new layer of printing material is continuously paved and compacted, and the adhered and rolled excessive printing material is recovered until the spraying is finished.
4. The 3D printing, forming and post-processing method of lignocellulosic biomass material as claimed in claim 1, wherein the step S3 is specifically: moving the spray head to a set position above the forming cylinder, spraying quantitative adhesive on the surface of the paved printing material in a planned track, and moving the spray head to a non-interference position after spraying a layer of adhesive; a darkroom formed by the shading device moves to a spraying position, ultraviolet rays with certain wavelength are utilized to radiate and illuminate the printing material which is permeated with the adhesive within a set time, and the ultraviolet lamp moves to a non-interference position after being cured; and repeating the operation, laying a layer of printing material, spraying adhesive, and curing by ultraviolet radiation until the primary blank is molded.
5. The 3D printing, forming and post-processing method of lignocellulosic biomass material as claimed in claim 1, wherein the step S4 is specifically: after the printing process is finished, the primary blank is moved to an actually required post-processing device through a conveying mechanism or a mechanical arm; firstly, cleaning printing materials remained on the surface of a primary blank and in a complex gap by adopting a gas blowing, mechanical cleaning and ultrasonic vibration method for the primary blank with certain strength, and removing powder after reinforcing the primary blank with lower strength by adopting a compressed air and low-temperature preheating method; secondly, improving the overall density of the formed part by adopting a cold isostatic pressing or warm isostatic pressing method, gradually pressurizing through a pressurizing system, and applying equal pressure to each surface of the initial blank; and finally, improving the surface quality of the formed part by adopting a coating and wax infiltration method, coating a thin layer of reinforcer on the surface of the primary blank, or taking out, airing and removing residual wax after the primary blank is immersed in melted wax for a few seconds.
CN202111495994.5A 2021-12-08 2021-12-08 3D printing forming and post-processing method of wood fiber biomass material Pending CN114161705A (en)

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CN202111495994.5A CN114161705A (en) 2021-12-08 2021-12-08 3D printing forming and post-processing method of wood fiber biomass material
ZA2022/13238A ZA202213238B (en) 2021-12-08 2022-12-07 3d printing and post-processing method of wood-based fiber biomass material

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CN110494236A (en) * 2017-03-20 2019-11-22 斯特拉塔西斯公司 Use the method and system of the material increasing material manufacturing of powder
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* Cited by examiner, † Cited by third party
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CN116041977A (en) * 2023-02-14 2023-05-02 中国林业科学研究院木材工业研究所 Preparation of wood-based sizing agent and ultraviolet curing forming method

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