最新刊期
期 3 ， 2018
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Evaluation Methods of Bending MOE of Cross-Laminated Timber Made from Domestic Japanese Larch Lumber
摘要：Domestic Japanese larch lumber was used to prepare cross-laminated timber（CLT） samples. Modulus of elasticity（MOE） was tested using a static method and longitudinal vibration. Shear analogy was also used to predict effective bending stiffness. Feasibility and accuracy of nondestructive testing technology and theoretical calculation were analyzed.Testing results showed that:1)MOE was improved by increasing the span/depth ratio and should be more than 24;2)Dynamic MOE was higher than static MOE with less than 10%of relative error;3)Effective bending stiffness of the CLT samples was predicted by shear analogy with less than 5%of relative error between predicted and measured values.关键词：cross-laminated timber;MOE;span/depth ratio;nondestructive testing;shear analogy method- 8
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发布时间：2021-02-07 - 摘要：Flexible decorative veneers were made by low temperature plasma treatment to improve the interface between teak veneers and low density polyethylene（LDPE） films. The veneers and films were then joined by hot-pressing.Results showed that peel strength and transverse tensile strength were most significantly impacted by hot pressing temperature followed by plasma processing speed.Optimal technology for making the veneers was 0.8 MPa of hot-pressing pressure,135℃of temperature,150 s of pressure time and 3 m/min of plasma processing speed.0.51 k N/m of peel strength,4.13 MPa of transverse tensile strength and good flexibility of the veneers were achieved under the above manufacturing parameters.关键词：teak veneer;LDPE film;flexible decorative veneer;manufacturing parameters;plasma;peel strength;transverse tensile strength
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发布时间：2021-02-07 - 摘要：Response surface methodology was used to establish a model which was used to analyze the influence of cold pressing time, pressure and adhesive spread on bonding strength of parquet substrates with built-in electric heating elements.The results showed that the cold pressing time and adhesive spread had significant effects on bonding strength between upper and lower layers of the substrates and that effect of the cold pressing time was greater than that of the adhesive spread.Cold pressing pressure had no significant effect.Under optimum manufacturing parameters like 47 min of cold pressing time,1.2 MPa of cold pressure and 215of adhesive spread,the bonding strength of the floor substrates reached 1.58 MPa.关键词：response surface methodology;built-in electric heating elements;parquet substrate;cold-pressing;bonding strength
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发布时间：2021-02-07 - 摘要：In order to make an I-beam for tests, LVL, as flange materials, and two kinds of structural panels, as sheathing materials, were connected by nails with different diameters. Thereafter, static and dynamic bearing capacity of the connections was tested. Testing results showed that the static and dynamic bearing capacity of the connections increased with increasing sheathing thickness and nail diameter. It was observed that when nail diameter was 3.8 mm, to connect 22 mm thick oriented strand board（OSB）, the connection possessed better performance. It was concluded that selection of nail diameters for making this kind of I-beam should consider sheathing thickness in practice.关键词：I-beam;flange;sheathing;nail connection;load performance;structural plywood;OSB
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- 68
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发布时间：2021-02-07 - 摘要：Residential fire brings tremendous threats to human lives and property safety. New features occurred in residential fires like high-rising residential buildings, aged residents and so on. To apply flame retardant materials in residential buildings could be able to minimize fire hazards by decreasing fire load, reducing smoke toxicity and building fire isolation areas. The authors suggested that fire protection standards for residential buildings should be required as high as public buildings, and passive-proof ways should be changed into active-proof.关键词：high-rise residential buildings;fire;flame retardant materials;fire load;smoke toxicity
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- 102
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发布时间：2021-02-07 - 摘要：Both acetylacetone method and 3-methyl-2-benzothiazone hydrochloride(MBTH) method were used to quantitatively analyze formaldehyde emissions from wood-based panel products. The results showed that with 120 L of sampling volume, method detection limit(MDL) of acetylacetone was 0.007 mg/m~3, which was relatively high for detecting low level(≤0.04 mg/m~3) formaldehyde emissions. The results also showed that MDL of MBTH method was 0.0008 mg/m~3 with fast and sensitive reactions, which was suitable for detecting low level(<0.124 mg/m~3) formaldehyde emissions according to GB 18580-2017.关键词：wood-based panel;formaldehyde emission;chamber method;acetylacetone method;MBTH method
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发布时间：2021-02-07 - 摘要：Both acetylacetone method and 3-methyl-2-benzothiazone hydrochloride（MBTH） method were used to quantitatively analyze formaldehyde emissions from wood-based panel products. The results showed that with 120 L of sampling volume, method detection limit（MDL） of acetylacetone was 0.007 mg/m3, which was relatively high for detecting low level（≤0.04 mg/m3） formaldehyde emissions. The results also showed that MDL of MBTH method was 0.0008 mg/m3 with fast and sensitive reactions, which was suitable for detecting low level（<0.124 mg/m3） formaldehyde emissions according to GB 18580-2017.关键词：wood-based panel;formaldehyde emission;chamber method;acetylacetone method;MBTH method
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发布时间：2021-02-07 - 摘要：The authors summarized current test methods, including gas analysis, desiccator, extraction and chamber methods, of formaldehyde emissions from wood-based flooring products used in a ground heating system. Characteristics of formaldehyde quantitative test methods, including acetyl acetone, chromotropic acid and phenol reagent methods, were also compared.It was proposed that chamber and chromotropic acid methods were the most suitable for measuring formaldehyde emissions from wood-based flooring products used in a ground heating system.It is suggested that the equilibrium treatment conditions of the testing sample and parameters of the simulated ground radiant heating device in the chamber be determined according to actual environment temperature characteristics for ground radiant heating.关键词：wood-based flooring products;ground heating system;formaldehyde emission;test methods
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- 144
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发布时间：2021-02-07 - 摘要：Chemical components of agarwood are contributors to aroma and pharmacological effects and therefore play important roles in quality assessment on agarwood. The authors made a review in chemical components, authenticity identification and quality grading of agarwood. They also proposed to develop authenticity identification technology and to establish grading method and quality certification system, aiming at identifying wild and artificial agarwood, original growing area and tree species for better development of the agarwood industry.关键词：agarwood;chemical components;authenticity identification;quality grading
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发布时间：2021-02-07 - 摘要：With customized furniture being popular, the odor released from furniture gets more and more attentions by consumers. In this paper, the recent research are summarized for odor in wood furniture, including the sources, influencing factors, test methods, and controlling technologies. Suggestions for future research on controlling odor are presented.关键词：furniture;wooden materials;odor;volatile organic compounds（VOC）
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- 257
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发布时间：2021-02-07 - 摘要：Medium density fiberboard samples to be used for making exterior furniture（MDF-FN-EXT） were made with mixed adhesives of emulsified diphenyl methane di-isocyanate（EMDI） and melamine modified urea-formaldehyde resin（MUF）. Effect of dosage of melamine and EMDI as well as hot pressing time on humidity resistance of the samples were evaluated.The results showed that optimum manufacturing parameters were 4% of EMDI,9% of melamine,and 3min of hot pressing time.Properties of the samples could meet the requirements of exterior furniture type in GB/T 11718-2009.关键词：emulsified diphenyl methane di-isocyanate（EMDI）;modified urea-formaldehyde resin（MUF）;medium density fiberboard for making exterior furniture（MDF-FN-EXT）
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发布时间：2021-02-07 - 摘要：A ground conductive plate was used on the back of wooden door leaves in an electrostatic spraying process to improve the coating amount for making door leaves.Testing results show that the peak electric field intensity by the new method,increased by nearly 13% compared with the normal method.Coating amount applied to door leaf samples increased by 50.3% after the first spraying and 37% after the second spraying.关键词：wooden door leaf;electrostatic spraying;coating amount;technique
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发布时间：2021-02-07 - 摘要：In order to improve sound and thermal characteristics of solid wood composite doors, the authors developed an optimization structural design for the door leaves. The modified wood composite door leaf was made of laminated veneer lumber（LVL） as the frame and with high density fiberboard（HDF） as the face layer of door sheets to replace MDF, and with glass fiber as the filler to replace honeycomb paper. Live sound pressure level measurement and heat flow metering methods were used to measure sound insulation and heat transfer coefficient values, respectively.The results showed that compared with control composite doors,the sound insulation of the modified door increased by 1.2 times with much lower heat transfer coefficient value,which reached the highest level.关键词：solid wood composite door;LVL;HDF;glass fiber;sound insulation;heat transfer coefficient
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发布时间：2021-02-07
- Address：Box 29，Research Institute of Wood Industry, No. 1, Dongxiaofu, Haidian District, Beijing Postal code：100091
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