最新刊期
期 2 ， 2021
- 摘要：This paper reviewed the research status and industry development of formaldehyde-free decorative paper for wood-based panels. The challenges in the development were analyzed. Furthermore, the research results in this field conducted at the Research Institute of Wood Industry, Chinese Academy of Forestry were presented; the suggestions for future research and development were proposed.关键词：decorative paper;formaldehyde-free;wood-based panel finish
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发布时间：2021-04-02 -
摘要：In order to enhance the wood utilization ratio of precious tree species and increase the value of finished products, the surface of furniture and wood products usually need to be furnished with decorative surfaces materials such as veneer, painting, PVC film, PP film, decorative paper, etc. to improve the appearance quality. This article briefly introduces the latest technologies and products of decorative surfaces for furniture and wood products, focusing on the development of domestic decorative paper. The prospect of the trend in new technologies and products was discussed .关键词：wood products;surface decoration;new product;new technology- 301
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发布时间：2021-04-02 -
摘要：Traditional phenol formaldehyde resin, as wood adhesive, needs high temperature and extended time to cure during hot pressing of the wood-based panel manufacturing. To improve the production efficiency and product performance, the low-temperature fast-curing phenol formaldehyde resin has been identified as an significant valuable process development. The research implemented domestically and internationally on the low-temperature curing phenol formaldehyde resin is reviewed. The review focus on the preparation of modification resin and the application of the curing agent. The mechanism of phenol formaldehyde resin modification by resorcinol, metal ions and urea were analyzed. The reaction process of single component and composite curing agent are also discussed respectively. Suggestions for future research are proposed.关键词：wood adhesives;phenol formaldehyde resin;low-temperature fast-curing;modification;curing agent- 125
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发布时间：2021-04-02 - 摘要：The authors reviewed the history and development of hollow particleboards. The research status of production equipment, production technology, utilization of raw materials and forming structure were summarized. The suggestions for future research were proposed. The prospective applications of hollow particleboards for in wooden doors, geothermal floors, and wood structural building wall were discussed and analyzed.关键词：hollow particleboard;production process characteristics;application prospect;wooden door;wood flooring used in ground heating system;wood structure building wall materials
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发布时间：2021-04-02
REVIEWS
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摘要：The current project analyzes the distinctive flexible manufacturing process of the mass production line for the customized panel furniture. The key equipment of flexible manufacturing including the storage equipment, the CNC cut-to-size saw, the edge banding machine, the drilling machine, the sorting machine, the automatic packaging machine, etc. were summarized. The equipment configuration of flexible production line for customized panel furniture is proposed to provide a reference for customized panel furniture manufacturers.关键词：customized panel furniture;production equipment;flexible manufacturing;equipment configuration- 85
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发布时间：2021-04-02 -
摘要：The within-tree variation of wood physical properties was evaluated for Acacia melanoxylon grown in China. The results showed that the differences of various physical properties in north-south direction were not significant. The radial variation was significantly greater than the longitudinal variation, which was the most distinctive in terms of the within-tree variation of various physical properties. The green moisture content of wood decreased gradually from the heartwood part toward the sapwood part, while the radial changing trend of wood density was basically opposite. The shrinkage and swelling values of wood gradually increased from heartwood to sapwood in the radial direction. The ratio of the tangential shrinkage to the radial shrinkage reached the highest level at the heartwood part near the sapwood. The radial variation trend of the sorption hysteresis coefficient was opposite to the hygroscopic equilibrium moisture content variation. These within-tree variation of wood properties need to be considered accordingly and comprehensively, and a scientific drying schedule should be determined when processing Acacia melanoxylon wood to improve its utilization.关键词：Acacia melanoxylon;physical property;radial variation;longitudinal variation- 83
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发布时间：2021-04-02
SPECIAL REPORTS
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摘要：Three traditional methods of wood species retreival methods including the manual comparison, the bisection search, and the punch-card retrieval system are reviewed. The computer database programs are also described. In order to conduct online intelligent retrieval system for conifer species, the authors developed an intelligent retrieval system for wood species using computer vision technologies. The structure and flow chart of the intelligent retrieval system were presented in this article. Suggestions on future research to conduct intelligent retrievals were proposed and discussed.关键词：wood species;retrieval methods;current status- 111
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发布时间：2021-04-06 -
摘要：In order to take full advantage of the compressive strength of glulam, prestress is often applied on the beam. However, due to the influence of the arch amplitude and other reasons, the range of prestress can't be overly large, which will limit the full strength of the glulam and prestressed steel. For this reason, this study investigated the method of prestressed control of the glulam continuous beam. The finite element analysis model was generated using the SAP2000 program. The computer model was compared with the experimental results to verify the feasibility of the method. The load-deflection relation curve, the stress cloud diagram of beam section, the ultimate bearing capacity, and the reasonable control range of 8 beams with different control amplitudes were analyzed. The results show that when the control range is at 18%~48% of the ultimate load, the ultimate load increases by 3.65%~58.1%. At the same time, the bearing capacity of the glulam continuous beam increases linearly. When the range of control was over 54%, due to the change of failure mode, the bearing capacity of the beams began to decline. Finally, the reasonable control range of the prestressed glulam continuous beam is approximately 24%~42% of the ultimate load.关键词：glulam continuous beam;prestressed control;finite element analysis;ultimate load- 78
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发布时间：2021-04-02 -
摘要：The bonding shear strength of cross laminated timber (CLT) is an important index to evaluate the bonding quality of CLT. There were six kinds of layup methods including the modulus of outer laminate(＞8~＜12 GPa (low), ≥12~≤16 GPa (middle), and＞16 GPa (high), the number of layers (three layers and five layers), the thickness of timber (15 mm and 25 mm), and layup directions (orthogonal and inclined 45 degrees). Based on LY/T 3039—2018, the bonding shear strength of CLT plate was tested. The results showed that the main failure modes were serrated shear failure along the wood surface and shear failure along the annual ring of transverse direction of the laminate. The loading rate had no significant effect on the bonding shear strength of CLT. The MOE of outer laminate, the laminate number, and the direction of layup had significant effects on the bonding shear strength of CLT plate, except that the laminate thickness.关键词：cross-laminated timber;bonding shear strength;Larix kaempferi (Lamb.) Carr.;failure modes;lay-up structure;gap width- 270
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发布时间：2021-04-02 -
摘要：40 mm-thickness Chinese fir lumber was dried with two schedules of high-temperature drying (HTD) technology respectively. The medium of drying schedules was distinct: Schedule I applied high-temperature humid air in all drying processes, while schedule II applied the superheated steam (SHS) as the drying medium in the early drying stage when the moisture content (MC) of wood was high, then high-temperature humid air in the later stage when MC decreased. The drying duration, the drying rate, and the drying quality of two types of HTD schedules were measured and analyzed. The results showed that the drying rate was different at the various stages of the two drying schedules; that of Schedule II in the early stage of drying was 1.30%/h, which was 37.2% lower than Schedule I; and that of Schedule II in the latter stage of drying was 1.89%/h, being 70.27% higher than Schedule I. Under the conditions of schedule II, internal checks were effectively avoided. The drying quality of 40 mm-thickness Chinese fir lumber by Schedule II met the requirements of the 2nd grade in the national standard GB/T 6491—2012 "Lumber Drying Quality".关键词：Chinese Fir;timber;High-temperature drying;Superheated Steam- 66
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发布时间：2021-04-02 -
摘要：Waterborne epoxy resin solution (WES) and dephenol 46 cottonseed protein (DCP-46) were employed as reinforcing modifiers to improve the bond strength of low formaldehyde emission urea-formaldehyde resin (LF-UF). The results showed that when the dosage of WES and DCP-46 were at 15% of the LF-UF content, respectively, the bond strength of class II plywood and class III plywood were increased by 145.7% and 103.3%, which met the requirements of class II plywood and class III plywood of GB/T 9846—2015 "Plywood for general use". The formaldehyde emission remained unchanged, at 0.2 mg/L, which met the requirements of LY/T 2870—2017 "Technical requirements of green wood-based panel and its products".关键词：plywood;waterborne epoxy resin;low-formaldehyde-emission urea-formaldehyde resin;cottonseed protein;Bond strength- 83
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发布时间：2021-04-02
RESEARCH PAPERS
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摘要：A machine vision system for measuring furniture panel dimensions was presented in this paper. To eliminate the effects of panel colours, textures, patterns, logos and surface defects, a two-steps imaging system was employed. The images with high contrast and sharp outlines were obtained by applying line-focused illuminate lights, a line-scan camera and an encoder. An image processing software, which extracts and measures the panel geometric dimensions was designed accordingly. 15 parameters including the panel length, the width, and the diagonal were calculated by the software. The machine vision system was tested in a manufactory line. The results showed the on-line inspection speed and the repeat accuracy of the system are higher comparing to the manual measurement of furniture panels. The average match level between the machine vision system measuring and manual measuring results reached up to 95% within the measurement error range of ± 0.5 mm.关键词：panel size measurement;image processing;machine vision;imaging system- 105
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发布时间：2021-04-02 -
摘要：In order to realize the rapid on-site detection of VOCs released from wooden furniture, a surface pressing sampler was developed as a rapid detection and sampling device for wooden furniture with flat and hard surface. The design principles and main structures of the device were introduced. 50 pieces of wooden furniture samples were quickly sampled and tested. The test data presented a certain correlation with the test data of the chamber method, and the re-inspection deviation rate was less than 10%. It showed that the device could met the design requirements with stable performance and operability.关键词：furniture;volatile organic compounds (VOCs);rapid detection;sampling device- 80
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发布时间：2021-04-02
APPLIED TECHNOLOGY
- 摘要：The status of China's national, industry, regional, association, and enterprise standards of the wooden furniture are reviewed and analyzed. The existing issues and challenges are presented. In order to deepen standardization reform, some suggestions are proposed for the further development of the wooden furniture standards.关键词：wooden furniture;standardization;situation;suggestion
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发布时间：2021-04-02
DISCUSSION ON STANDARDS
- Address：Box 29，Research Institute of Wood Industry, No. 1, Dongxiaofu, Haidian District, Beijing Postal code：100091
- Tel：010-62889419 Email：mckx@caf.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
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