CN114161705B - 3D printing forming and post-processing method for lignocellulosic biomass material - Google Patents

3D printing forming and post-processing method for lignocellulosic biomass material Download PDF

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CN114161705B
CN114161705B CN202111495994.5A CN202111495994A CN114161705B CN 114161705 B CN114161705 B CN 114161705B CN 202111495994 A CN202111495994 A CN 202111495994A CN 114161705 B CN114161705 B CN 114161705B
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powder
printing
spraying
post
printing material
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CN114161705A (en
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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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Priority to ZA2022/13238A priority patent/ZA202213238B/en
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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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Ceramic Engineering (AREA)
  • Civil Engineering (AREA)
  • Composite Materials (AREA)
  • Structural Engineering (AREA)

Abstract

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

Description

3D printing forming and post-processing method for lignocellulosic 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-treatment method of a wood fiber biomass material.
Background
Both the preparation of the raw materials and the molding process can affect the final molding effect of the 3D printed product. The 3D printing composite material using the lignocellulosic biomass material as a base material is processed and molded by physical, chemical, biological and other technical means, and has the characteristics of excellent performance, energy conservation, environmental protection, complete types and high added value. The adhesive spraying technology (3 DP) is an additive manufacturing process combining droplet spraying and powder bed forming technologies, is economical and environment-friendly, has larger forming size, and can realize medium-low temperature additive manufacturing of the wood fiber biomass material by utilizing the characteristics of quick ultraviolet light curing, environment friendliness and quick bonding of a liquid adhesive to a powder material.
The powder spreading is an important component of the 3DP process and is one of main parameters affecting the final precision of the formed part, the common powder feeding forms in the 3DP process at present are two types of upper powder feeding and lower powder feeding, and the powder spreading forms comprise a movable hopper type, a scraping plate type and a roller type and mutually different combinations. In the patent of 'a method and equipment for rapid molding of a bamboo-plastic composite material', the inventor adopts a powder mixing centrifugal tank to store powder, a paving vibrating screen to fall off the powder, and a pressing plate to press the powder, which belongs to an upper powder feeding mode.
The mechanical strength and the surface quality are key technical problems in the field of 3D printing of lignocellulosic biomass materials, and are also important factors for limiting the practical application range of the lignocellulosic biomass materials. The primary 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 primary blank are required to be improved through post-treatment, and common post-treatment methods mainly comprise a waxing method, a curing 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 lignocellulose biomass material, which aims to solve the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides a 3D printing forming and post-processing method of a lignocellulose biomass material, which comprises the following steps:
S1: mixing a lignocellulosic biomass material with plastic powder, adding a modifier, and uniformly mixing by high-speed stirring to obtain a printing material;
s2: the powder supply cylinder pushes the printing material to rise, and a powder layer surface suitable for printing is formed on the forming cylinder;
S3: spraying an adhesive on the spray head according to a set path, spraying a layer of adhesive, 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 through a conveying mechanism or a mechanical arm;
s5: and taking out the final formed part, and recovering residual powder.
Preferably, step S1 is specifically: firstly, crushing a lignocellulose biomass material by a pulverizer, and screening out a particle material with a required mesh number by using screening screens with different mesh numbers; secondly, preparing lignocellulose biomass material powder and plastic powder into different proportions by using a precise electronic scale, and primarily mixing; and adding the 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 a powder supply cylinder, a powder supply cylinder stepping motor drives a gear and a screw rod to move through a motor shaft, the screw rod 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, a forming cylinder finishes opposite operation, the forming cylinder stepping motor drives the gear and the screw rod to move through the motor shaft, the screw rod descends, the sleeve descends along with the gear and the screw rod, and the substrate bears the printing material to descend by a set height; the printing material is paved on the surface of the forming cylinder in one direction and is uniformly compacted; after the spraying of one layer is finished, the powder supply cylinder continues to ascend, the forming cylinder continues to descend, the new layer of printing material is continuously paved and compacted, and the adhered and rolled excessive printing material is recovered after the spraying is finished.
Preferably, step S3 is specifically: the spray head moves to a set position above the forming cylinder, a fixed amount of adhesive is sprayed on the surface of the paved printing material according to a planned track, and after a layer of adhesive is sprayed, the spraying head moves to a non-interference position; the darkroom formed by the shading device moves to the spraying position, the printing material permeated into the adhesive is irradiated by ultraviolet rays with a certain wavelength within a set time, and the ultraviolet lamp moves to the non-interference position after curing is completed; repeating the above operation, paving a layer of printing material, spraying an adhesive, and curing by ultraviolet radiation until the primary blank is formed.
Preferably, step S4 is specifically: firstly, cleaning printing materials remained on the surface of a primary blank and in complex gaps by adopting a gas blowing, mechanical cleaning and ultrasonic vibration method for the primary blank with certain strength, and carrying out powder removal after strengthening by adopting a compressed air and low-temperature preheating method for the primary blank with lower strength; secondly, the density of the whole formed part is improved by adopting a cold isostatic pressing or warm isostatic pressing method, the pressure is gradually increased by a pressurizing system, and equal pressure is applied to each surface of the primary blank; finally, coating and wax infiltration methods are adopted to improve the surface quality of the formed part, and a thin layer of reinforcing agent (such as bi-component polyurethane, liquid ultraviolet photosensitive resin and the like) is coated on the surface of the primary blank, or the primary blank is immersed in the molten wax for a few seconds, and then taken out, dried and the residual wax is removed.
By adopting the technical scheme, the invention has the following beneficial effects:
1: the wood material additive manufacturing has wide sources of applicable raw materials, comprises renewable plant materials such as fast-growing wood, agricultural and forestry waste and the like and organic resources including relevant waste materials, and has the advantages of low cost, energy conservation and environmental protection. The lignocellulosic biomass material 3D printing product has both natural texture of wood and good performance of filling materials.
2: The adhesive spraying technology and the ultraviolet curing technology are combined, the molding size is large, and the medium-low temperature curing of the wood material is realized.
3: The piezoelectric micro-spraying technology is used, so that the printing speed is high, and the spraying viscosity range is wide.
4: The printing process combines the post-treatment technology, reduces the production period and the labor cost, and realizes the conciseness and high efficiency of the 3D printing process.
5: The lower powder feeding mode can ensure layering thickness and positioning precision more easily, and the problems that the adhesive permeation diffusion effect is more obvious due to poor powder laying effect can be reduced more easily by firstly laying and then compacting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an apparatus flow diagram of a method of 3D printing forming and post-processing lignocellulosic biomass material of the present invention;
fig. 2 is a process flow diagram of a method of 3D printing and post-processing lignocellulosic biomass material in accordance with the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 1-2, the embodiment provides a method for 3D printing forming and post-processing of lignocellulosic biomass material, applied to a 3DP device, the forming method comprising the following steps: s1: mixing the wood fiber biomass material, the plastic, the additive and other powder, adding a proper modifier, and uniformly mixing by high-speed stirring to obtain a printing material; s2: feeding the printing material into a powder supply cylinder, paving and compacting, and forming a powder layer surface suitable for printing by a forming cylinder; s3: spraying an adhesive on the surface of the uniform powder layer by the spray head according to a set path, then curing by ultraviolet radiation illumination, spraying a layer, and curing the layer until the primary blank is finished; s4: sequentially carrying out actual required post-treatment operation on the solidified primary blank; s5: and taking out the final formed part, and recovering residual powder. The method is based on a 3DP process and is not limited by the molding size; the powder feeding mode is adopted, firstly, leveling and then compacting are carried out, and 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 batch production is facilitated. The method is also applicable to other nonmetallic material 3DP equipment, including 3DP equipment which independently bears printing or post-treatment and integrally has printing and post-treatment processes.
The invention provides a preparation method of a wood 3D printing material. Firstly, crushing a lignocellulose biomass material by a pulverizer, and screening out a particle material with a required mesh number by using screening screens with different mesh numbers; secondly, preparing lignocellulose biomass material powder and polyethylene powder into different proportions by using a precise electronic scale, and primarily 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, additive, modifier and the like are completed according to the production requirements of actual molded parts. The invention provides an embodiment, raw materials: the mass ratio of the lignocellulosic biomass material to the lignocellulosic biomass material in the plastic powder mixture is as follows: 10%, 20%, 40% or 100%; screen mesh number of lignocellulosic biomass material: 60 mesh, 100 mesh or 120 mesh; the modifier is maleic anhydride, and the mass ratio of the modifier to the lignocellulose biomass material is as follows: 1% -4%.
The invention provides a one-way powder paving method for lower powder feeding. After the prepared printing material is loaded into a powder supply cylinder, a powder supply cylinder stepping motor drives a gear and a screw rod to move through a motor shaft, the screw rod 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, a forming cylinder finishes opposite operation, the forming cylinder stepping motor drives the gear and the screw rod to move through the motor shaft, the screw rod descends, the sleeve descends along with the gear and the screw rod, and the substrate bears the printing material to descend by a set height; the printing material is paved on the surface of the forming cylinder in one direction and is uniformly compacted; after the spraying of one layer is finished, the powder supply cylinder continues to ascend, the forming cylinder continues to descend, the new layer of printing material is continuously paved and compacted, and the adhered and rolled excessive printing material is recovered after the spraying is finished. The powder spreading method provided by the invention takes the provided 3DP equipment as an example, and is particularly influenced by the powder spreading structure, the powder cylinder size, the forming space and the like in the printing equipment, and the uniform and flat powder layer surface is the final purpose of all powder spreading designs. The present invention provides an embodiment, layering height: 0.5mm, doctor blade speed: 20mm/s, roller diameter: 32mm.
The invention provides a method for printing a blank by spraying according to requirements and curing in a darkroom. The spray head moves to a set position above the forming cylinder, a fixed amount of adhesive is sprayed on the surface of the paved printing material according to a planned track, and after a layer of adhesive is sprayed, the spraying head moves to a non-interference position; the darkroom formed by the shading device moves to the spraying position, the printing material permeated into the adhesive is irradiated by ultraviolet rays with a certain wavelength within a set time, and the ultraviolet lamp moves to the non-interference position after curing is completed; repeating the above operation, paving a layer of printing material, spraying an adhesive, and curing by ultraviolet radiation until the primary blank is formed; the penetration and diffusion of the adhesive on the surface of the powder layer can influence the bonding effect between the powder layers, the monitoring device realizes the real-time whole-process monitoring of the extrusion, dripping, contact, penetration, diffusion and other processes of the adhesive within the range of 60-180 degrees, and the real-time monitoring system is used for cooperatively printing the quality monitoring application of the formed part in the whole-process integrated forming process, so that the process parameters such as powder spreading, 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, a spray head: piezojet (nozzle diameter 50 μm, jet speed 10 mm/s), adhesive: liquid ultraviolet glue (viscosity 600 mpa), ultraviolet lamp: wavelength range 200-400nm, curing time: 30s-1min.
The invention provides a post-processing method for a joint printing process. After the printing process is finished, the primary blank is moved to a post-processing device which is actually needed through a conveying mechanism or a mechanical arm and the like; firstly, adopting a mechanical cleaning method, such as cleaning printing materials remained on the surface of a primary blank and in complex gaps by an electric brush at a proper rotating speed; secondly, an isostatic pressing method, such as cold isostatic pressing or warm isostatic pressing technology, is adopted to improve the overall density of the formed part; finally, coating, wax infiltration and other methods are adopted to improve the surface quality of the formed part. The post-processing method may be appropriately selected according to actual needs, and is not limited to this embodiment. The invention provides an embodiment, mechanical cleaning rotational speed: moderate and small, isostatic pressure temperature: normal temperature or below 80-120 ℃, pressure intensity: about 300MPa, surface treatment: and (5) wax infiltration.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (3)

1. The 3D printing forming and post-processing method for the lignocellulosic biomass material is characterized by comprising the following steps of:
S1: mixing a lignocellulosic biomass material with plastic powder, adding a modifier, and uniformly mixing by high-speed stirring to obtain a printing material;
s2: the powder supply cylinder pushes the printing material to rise, and a powder layer surface suitable for printing is formed on the forming cylinder;
s3: spraying an adhesive by the spray head according to a set path, spraying a layer, and curing the 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 through a conveying mechanism or a mechanical arm;
s5: taking out the final formed part, and recovering residual powder; the step S1 specifically comprises the following steps: firstly, crushing a lignocellulose biomass material by a pulverizer, and screening out a particle material with a required mesh number by using screening screens with different mesh numbers; secondly, preparing lignocellulose biomass material powder and plastic powder into different proportions by using a precise electronic scale, and primarily mixing; adding a modifier, and uniformly stirring and mixing at a high speed to obtain a printing material;
the step S4 specifically comprises the following steps: after the printing process is finished, the primary blank is moved to a post-processing device which is actually needed through a conveying mechanism or a mechanical arm; firstly, cleaning printing materials remained on the surface of a primary blank and in complex gaps by adopting a gas blowing, mechanical cleaning and ultrasonic vibration method for the primary blank with certain strength, and carrying out powder removal after strengthening by adopting a compressed air and low-temperature preheating method for the primary blank with lower strength; secondly, the density of the whole formed part is improved by adopting a cold isostatic pressing or warm isostatic pressing method, the pressure is gradually increased by a pressurizing system, and equal pressure is applied to each surface of the primary blank; finally, the surface quality of the formed part is improved by adopting a coating and waxing method, a thin layer of reinforcing agent is coated on the surface of the primary blank, or the primary blank is immersed in molten wax for a few seconds and then taken out, dried and the residual wax is removed.
2. The method for 3D printing forming and post-processing of lignocellulosic biomass material according to claim 1, wherein step S2 is specifically: after the prepared printing material is loaded into a powder supply cylinder, a powder supply cylinder stepping motor drives a gear and a screw rod to move through a motor shaft, the screw rod 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, a forming cylinder finishes opposite operation, the forming cylinder stepping motor drives the gear and the screw rod to move through the motor shaft, the screw rod descends, the sleeve descends along with the gear and the screw rod, and the substrate bears the printing material to descend by a set height; the printing material is paved on the surface of the forming cylinder in one direction and is uniformly compacted; after the spraying of one layer is finished, the powder supply cylinder continues to ascend, the forming cylinder continues to descend, the new layer of printing material is continuously paved and compacted, and the adhered and rolled excessive printing material is recovered after the spraying is finished.
3. The method for 3D printing forming and post-processing of lignocellulosic biomass material according to claim 1, wherein step S3 is specifically: the spray head moves to a set position above the forming cylinder, a fixed amount of adhesive is sprayed on the surface of the paved printing material according to a planned track, and after a layer of adhesive is sprayed, the spraying head moves to a non-interference position; the darkroom formed by the shading device moves to the spraying position, the printing material permeated into the adhesive is irradiated by ultraviolet rays with a certain wavelength within a set time, and the ultraviolet lamp moves to the non-interference position after curing is completed; repeating the above operation, paving a layer of printing material, spraying an adhesive, and curing by ultraviolet radiation until the primary blank is formed.
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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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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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