最新刊期
期 5 ， 2022
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摘要：As a bio-material, wood presents the low yield strength, extra-large deformation, and two-stage hardening behavior under perpendicular-to-grain compression load. The mechanical behavior of wood is quite important in many aspects: 1) building engineering, which needs be handled with great care to avoid excessive local and uneven deformation that may threaten the safety of structure; 2) wood modification, which helps to improve the processing technology; 3) as cushion materials, which help to evaluate and optimize its energy consumption behavior. Thus, it is essential to investigate the mechanical behavior of wood under perpendicular-to-grain compression load. This paper reviewed the research related to the behavior of wood under perpendicular-to-grain compression, including the experimental research, finite element models, and theoretical models. The shortcomings of the available research were analyzed, while suggestions for the future research were proposed.关键词：wood compression perpendicular-to-grain;large deformation;failure mechanism;theory and model- 260
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发布时间：2022-10-12 -
摘要：The wood chemical coloring technology based on the polyphenol-iron complex has the advantages of being low carbon, green, and environmentally friendly. The research and development of this technology has been funded under the "13th Five-Year" national key research and development program. A series of results have been achieved so far. This paper summarizes the research process of the wood chemical coloring technology based on polyphenol-iron complex in the aspects of mechanism, process, technology, and new product development. The application trend of wood polyphenol chemistry was analyzed in the wood color regulation, wood color-difference reduction, wood texture enhancement, and wood color fastness. The opportunities and challenges in the wood chemical coloring were explained. It provideed reference for the research and development, as well as application of color regulation in wood polyphenol.关键词：wood;polyphenols;ferric ions;complexation;chemical coloration;color regulation- 124
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发布时间：2022-10-12 -
摘要：In this study, the theoretical and algorithmic research on the image acquisition, feature extraction, recognition, and classification involved in machine-vision-based wood recognition technology were analyzed based on the development status both in the domestic and international furniture manufacturing. Furthermore, the applications of machine vision in the intelligent manufacturing of wood products, such as the identification of tree species, wood inspection and classification, defect detection, surface color analysis, and quality control of furnishing products were thoroughly examed. The development trend of machine vision in the manufacturing of wood products was put forward with the consideration of the current development of wooden furnishing enterprises. These findings provide a solid foundation for not only the research in the wood science but also the manufacture of wood products.关键词：machine vision;wood industry;wood products;Deep learning;defects detection;quality control- 156
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发布时间：2022-10-12
REVIEWS
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摘要：The custom panel furniture manufacturing is taking challenges and opportunities of upgrading and transforming into the intelligent manufacturing. The level of warehouse automation directly affects the production efficiency of custom panel furniture manufacturing. The automation level of traditional forklift-operation warehouse is low, and the efficiency is not high, while the intelligent storage-and-retrieval system can solve the above problems. This article reviewed the furniture market situation, described the current dilemma of the warehouse system of the custom panel furniture manufacturing, and elaborated the advantages of the role of intelligent storage-and-retrieval system. In order to build intelligent storage-and-retrieval system, the principle equipment, key technologies, and construction strategies of the custom panel furniture manufacturing were analyzed.关键词：custom panel furniture;intelligent manufacturing;intelligent storage-and-retrieval system;warehouse management- 36
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发布时间：2022-10-12 -
摘要：Under the trend of intelligent manufacturing, improving the informatization and digitalization level of custom furniture production is an important way to advance the technology innovation and transformation. The current packaging section of custom panel furniture enterprises is low in production efficiency with imperfect packaging rules and non-standard workshop management. This study analyzed the necessity of technology improvement in the packaging section of furniture enterprises. The infrastructures of information and digital technology framework were proposed for the digital packaging section. The infrastructure mainly includes three parts: the digital hardware equipment configuration, digital packaging optimization software selection, and digital information control. It provides a reference for improving the digital technology level in the custom furniture packaging section.关键词：custom furniture;packaging section;digital;intelligent manufacturing- 44
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发布时间：2022-10-12
RESEARCH ON PLANNING AND MANAGEMENT FOR HOME FURNISHING DIGITAL WORKSHOP
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摘要：In this research, differences in water adsorption behavior between the compression wood (CW) and the opposite wood (OW) from Chinese fir (Cunninghamia lanceolata) were investigated with the dynamic water vapor sorption analysis (DVS) using the GAB model and H-H model. Results showed that when the relative humidity (RH) of specimens was lower than 70%, the equilibrium moisture content (EMC) of CW was close to OW. When RH was above 70%, the EMC of CW was lower than that of OW. The hygroscopic hysteresis was observed for both CW and OW, and the max values of hysteresis of CW and OW was 3.11% and 3.28%, respectively. The GAB model and H-H model can be used to describe the water adsorption isotherms of CW and OW, with R2 both above 0.995. In the GAB model, the monolayer molecules water adsorption for CW and OW were 6.00% and 5.40%, respectively. In the H-H model, the maximum of monolayer molecules water adsorption of CW (4.93%) was slightly higher than that of OW (4.72%), while the maximum of polylayer molecules water adsorption of CW (13.57%) was lower than that of OW (14.79%). The differences in water adsorption behavior of CW and OW were closely related to its chemical constituent contents.关键词：Chinese Fir;compression wood;opposite wood;water adsorption;GAB model;H-H model- 151
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发布时间：2022-10-12 -
摘要：Carbon nanotubes/nanocellulose aerogels were prepared by supercritical drying and freeze drying respectively. The effects of two drying methods on the morphology, chemical structure, crystallinity, specific surface area, pore structure and electrochemical properties of aerogel were investigated. The results showed that the two drying methods had a significant effect on the microstructure, crystallinity, specific surface area, pore structure and electrochemical properties of aerogel, but had limited effect on its chemical structure. The supercritical drying SWCNT/CNF aerogel showed a fibrous porous network structure with a crystallinity of 56.41%, a specific surface area of 266.39 m²/g, a pore volume of 0.77 cm³/g and an area specific capacity of 265.46 mF/cm2. However, the freeze-dried sample had a flake structure with 31.37 % crystallinity, 47.78 m²/g specific surface area, 0.15 cm³/g pore volume and 176.04 mF/cm2 area specific capacity, respectively. The supercritical drying aerogel had higher crystallinity, specific surface area and pore volume, which could provide more active sites for electrode materials and improve their electrochemical performance. This study provided a research idea for the preparation of high-performance electrode materials.关键词：aerogel;nanocellulose;carbon nanotubes;supercritical drying;freeze drying- 112
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发布时间：2022-10-12 -
摘要：Due to the influence of moisture content during hot pressing, the heat transfer and mechanical properties of bamboo scrimber will be different. During the hot pressing process, there will be a "boiler effect" that the core layer temperature raised sharply, leading to change in the hot pressing cycle of plates. The influence of moisture content on hot pressing heat transfer and "boiler effect" of slabs with different densities was investigated, and the mathematical model of temperature raised time with different moisture content and densities was established. The results showed that due to the influence of "boiler effect", under the same density, the heating time was gradually shortened with the increase of water content; In the pressure maintaining stage, the maximum temperature and temperature raised with the increase of water content. When the density was 0.90 g/cm3, the cooling time of the plate increased first, and then decreased with the increase of water content. When the density was 1.05 g/cm3 and 1.20 g/cm3, the cooling time decreased with the increase of water content. Therefore, in actual production, when pressing plates with a density greater than 1.05 g/cm3, it was recommended that the moisture content be controlled at about 15%. This study provided a reference for the hot pressing process of bamboo based fiber composites.关键词：bamboo scrimber;hot-pressing heat transfer;moisture content;boiler effect- 74
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发布时间：2022-10-12 -
摘要：In this study, melamine-urea-glyoxal (MUG) resin was synthesized by replacing formaldehyde with glyoxal. The synthesis of MUG was used to modify poplar wood. To achieve optimized synthesis condition, MUG resin was synthesized under different temperatures, pH values, and mole ratios. The performance of each synthesis was analyzed. The results showed that when the reaction pH value was 4~5, the reaction temperature was 65 ℃, and the molar ratio of melamine-urea-glyoxal was 0.08∶0.40∶1.00, the performance of the synthesized MUG resin performed optimally. The resin viscosity was 15.01s, the solid content was 49.89%, the water miscibility was greater than 10, and the storage time was greater than 90 days. Through mass spectrometry and infrared spectroscopy, it was found that the chemical reactions occurred between melamine, urea and glyoxal, and the synthesized products were mainly oligomers with relative molecular mass less than 600. According to TG-DSC analysis, the resin began to cure after 90 ℃. An obvious thermal curing endothermic peak appeared at 169 ℃. Compared with untreated wood, when the mass fraction of MUG resin was 20%, the modulus of ruptures (MOR) and modulus of elasticity (MOE) were increased by 17.5% and 18.5%, respectively.关键词：poplar modification;melamine-urea-glyoxal resin;synthetic process;physical and mechanical properties- 85
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发布时间：2022-10-12 -
摘要：In order to study the effect of three timber-concrete constructions on the carbon reduction in Baiyangdian Wharf of Xiong'an new area in Hebei Province, it was compared with the equivalent steel-concrete constructions. In this paper, according to the equivalent replacement factor, the amount of building materials of equivalent steel-concrete constructions was determined. In accordance with GB/T 51366—2019 Standard for building carbon emission calculation, the carbon emission of three timber-concrete constructions and equivalent steel-concrete constructions were calculated by using the life-cycle assessment method. The results showed that the carbon reduction effect of timber-concrete constructions was mostly reflected in building material production and transportation period, and the carbon emission difference in construction and demolition period was relatively small. Compared with equivalent steel-concrete constructions, the carbon emission of timber-concrete constructions decreased about 10% in material production period, and about 19% in terms of carbon sequestration of wood. Carbon emission of the above-ground timber-concrete constructions decreased about 18%~25% in material production period, and about 40%~46% after considering carbon sequestration.关键词：timber constructions;equivalent steel-concrete constructions;carbon emission;carbon sequestration;life-cycle assessment- 56
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发布时间：2022-10-12 -
摘要：In order to analyze the content of 3-iodo-2-propynyl butyl carbamate (IPBC) in treated wood accurately, high performance liquid chromatography (HPLC) analytical method was established. Meanwhile, the optimization of ultrasonic extraction method on extracting IPBC from Chinese fir was conducted by comparing the effects of different solvents, the amount of solvent, and the extraction time. UV detector and C18 reversed-phase column were used for detection. The chromatographic conditions for analysis of IPBC were as follows: flow phase acetonitrile-water of 52∶48, the flow rate of 1.0 mL/min, and the UV detection wavelength of 200 nm. There was a good linear relationship between IPBC concentration and chromatographic peak area in the range of 5~120 mg/L, with coefficient of determination was 0.9998. The coefficient of variation and recovery of samples were 0.66% and 99.5%~100.6%, respectively. In the ultrasonic extraction method, either methanol or methanol-water as the solvent has a better extraction effect. The methanol-water volume ratio of 7∶3 was the most optimal in minimizing the use of methanol. The amount of solvent and extraction time have a certain influence on the results, and the optimal conditions were at a ratio of 20 mL/g liquid-solid with extraction time of 30 mins. Under optimal conditions, four samples were processed and analyzed. The recovery rate of IPBC ranged between 97.5%~106.4%, with the standard deviation was 0.3%~2.6%. This method can be used for analyzing the content of IPBC in treated wood materials, not only the pre-treatment procedure is simple and quick, but also with high accuracy and good reproducibility.关键词：3-iodo-2-propynyl butyl carbamate (IPBC);high performance liquid chromatography (HPLC);preservative-treated wood;Ultrasonic;extraction method- 57
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发布时间：2022-10-12 -
摘要：Two different ratios of wood-plastic composite (WPC) were cut with cemented carbide tools. The ratio of polyethylene and wood powder was at 6∶4 for the material A while 3∶7 for the material B respectively. The effects of tool rake angles (2°, 6°, and 10°) and cutting depth (0.5, 1.0, and 1.5 mm) on WPC cutting force, cutting temperature, and surface roughness were investigated. The results showed that with the rake angle of the tool increased from 2° to 10°, the cutting force, cutting temperature, and surface roughness of material A were reduced respectively by about 41%, 12%, and 17% during finishing process with a cutting depth of 0.5 mm while decreased respectively by about 28%, 21%, and 13% during roughing process with a cutting depth of 1.5 mm. With the cutting depth increased from 0.5 mm to 1.5 mm when the tool rake angle was 2°, the cutting force, cutting temperature, and surface roughness of material A increased by about 55%, 17%, and 26% respectively. The cutting performance of material B was consistent with that of material A. In actual production, it was recommended to increase the cutting depth appropriately in the roughing process to improve production efficiency. However, in the finishing process, it was recommended to increase the rake angle of the tool and select a smaller cutting depth to improve the surface machining quality of WPC.关键词：wood-plastic composite (WPC);rake angle;cutting depth;cutting force;surface roughness- 37
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发布时间：2022-10-12
RESEARCH PAPERS
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摘要：Through the application analysis of parameter characterization and control system conceptualization of particleboard and fibreboard process , this paper attempts to reveal the principles and laws of wood-based panel process control system. A new critical thinking mode is integrated to guide the wood-based panel process control system. It is expected to provide reference for improving worker's operational skills and upgrading the research and development in the automation of wood-based panel process control system and continuous plywood manufacturing.关键词：wood-based panel process control;parameter characterization;control conceptualization;critical thinking- 82
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发布时间：2022-10-12 -
摘要：The purpose of the study is to explore the research status of the suitable smart homes for seniors in China and overseas. Based on CiteSpace software, the research literature was collected from the database of the China National Knowledge Infrastructure (CNKI) and the Web of Science from 2001 to 2021. The knowledge web was drew from the aspects of annual document volumes, regional distribution, disciplines, co-citation, hot topics, and keywords, etc. The research context, hot topics, and development trend of suitable smart homes for seniors was analyzed and summarized. It was found that the popularity of research on this subject was higher overseas than domestic. Both domestic and overseas research involved multi-disciplinary fields, among which the research in a certain direction overseas was extensive and the research in China was in depth. Interdisciplinary research fields such as industry, computer, gerontology, and medicine were adopted both domestic and overseas. Research keywords were mainly focused on the senior group, intelligent technology, and the relationship between them. Among them, home-based senior care and intelligent health care were preferred in China, while innovative research and development on intelligent technologies was more popular in foreign countries. Recently, research interests in China and overseas focus on the innovation and practice of emerging technologies such as the Internet of things in the senior home. In the future, the research trend will be in the direction of the technical accuracy, generic and custom designs, product applicability, and the construction of age appropriate smart home system in China.关键词：suitable for seniors;smart home;knowledge web- 64
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发布时间：2022-10-12
DISCUSSION ＆SUGGESTION
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