{"title":"Characterization of Cellulose Nanocrystal Suspension Rheological Properties Using a Rotational Viscometer","authors":"Yucheng Peng, Changlei Xia, B. Via","doi":"10.13073/FPJ-D-21-00026","DOIUrl":"https://doi.org/10.13073/FPJ-D-21-00026","url":null,"abstract":"","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":"71 1","pages":"290-297"},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41573974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yan Yang, He Sun, Shuangmao Yang, Wen Sun, Yingfeng Zhao, Bin Li, Wei Wang, Xiaoqi Zhang, Shi-jun Jiang, Qian Xu
{"title":"Fourier-Transform Infrared Spectroscopy Analysis of the Changes in Chemical Composition of Wooden Components: Part II—The Ancient Building of Danxia Temple","authors":"Yan Yang, He Sun, Shuangmao Yang, Wen Sun, Yingfeng Zhao, Bin Li, Wei Wang, Xiaoqi Zhang, Shi-jun Jiang, Qian Xu","doi":"10.13073/FPJ-D-21-00015","DOIUrl":"https://doi.org/10.13073/FPJ-D-21-00015","url":null,"abstract":"","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":"71 1","pages":"283-289"},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48404261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lili Shang, Xinge Liu, Zehui Jiang, Gen-lin Tian, Shumin Yang
Moso bamboo (Phyllostachys edulis), an apt example of an anisotropic, functionally graded composite material, is the most important commercial bamboo species of China. This species has excellent mechanical properties due to its unique vascular bundle structure. This article examines the variation in mechanical properties of single vascular bundles with respect to their location within a bamboo culm. The mechanical exfoliation method was used to prepare the single vascular bundle. This study found that moso bamboo has superior stiffness and strength. Additionally, the variation in properties was large in the radial direction but minimal in longitudinal direction. The large variation in mechanical properties of vascular bundles can be ascribed to the synergistic effect of the fibrous sheath and parenchyma rather than to changes in fibrous sheath properties. This study provides a basis for the structure application for moso bamboo.
{"title":"Variation in Tensile Properties of Single Vascular Bundles in Moso Bamboo","authors":"Lili Shang, Xinge Liu, Zehui Jiang, Gen-lin Tian, Shumin Yang","doi":"10.13073/fpj-d-21-00002","DOIUrl":"https://doi.org/10.13073/fpj-d-21-00002","url":null,"abstract":"\u0000 Moso bamboo (Phyllostachys edulis), an apt example of an anisotropic, functionally graded composite material, is the most important commercial bamboo species of China. This species has excellent mechanical properties due to its unique vascular bundle structure. This article examines the variation in mechanical properties of single vascular bundles with respect to their location within a bamboo culm. The mechanical exfoliation method was used to prepare the single vascular bundle. This study found that moso bamboo has superior stiffness and strength. Additionally, the variation in properties was large in the radial direction but minimal in longitudinal direction. The large variation in mechanical properties of vascular bundles can be ascribed to the synergistic effect of the fibrous sheath and parenchyma rather than to changes in fibrous sheath properties. This study provides a basis for the structure application for moso bamboo.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41504681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Kojima, T. Makino, Kazuaki Ota, Kazushige Murayama, H. Kobori, K. Aoki, Shigehiko Suzuki, Hirokazu Ito
{"title":"Evaluation of the Mechanical and Physical Properties of Insulation Fiberboard with Cellulose Nanofibers","authors":"Y. Kojima, T. Makino, Kazuaki Ota, Kazushige Murayama, H. Kobori, K. Aoki, Shigehiko Suzuki, Hirokazu Ito","doi":"10.13073/FPJ-D-21-00030","DOIUrl":"https://doi.org/10.13073/FPJ-D-21-00030","url":null,"abstract":"","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":"71 1","pages":"275-282"},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44081705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. França, R. Shmulsky, J. Ratcliff, B. Farber, C. A. Senalik, R. Ross, R. D. Seale
When discussing structural southern yellow pine lumber, questions frequently are asked regarding changes over time. This is a significant area of discussion given that structural lumber properties (i.e., design values) were changed around 2012. Climate change, forest management, genetics, processing, and others are listed among the many possible contributing factors. Of interest are these questions: (1) Are changes in bending properties permanent at some fundamental level, or are they somewhat dynamic and responsive to controllable factors? (2) To what degree have the basic southern pine wood mechanical properties changed over time? Related thereto, this research examines the bending properties of small clear pine specimens from three samples. Sample 1 was pulled from a production-weighted sample of in-grade parent lumber. Sample 2 was pulled from commercially available molding and millwork. Sample 3 was pulled from data from the U.S. Department of Agriculture Forestry Products Laboratory from the early to mid-1960s. The flexural properties of small clear specimens among the three samples showed some statistically significant differences. However, there was no clear trend regarding these differences. These results appear to support the notion that while the variability of pine's flexural properties is significant and that while many changes in forest management and production have occurred over the past five decades, the basic density and bending strength of clear southern pine appear generally stable over time.
{"title":"Yellow Pine Small Clear Flexural Properties across Five Decades","authors":"F. França, R. Shmulsky, J. Ratcliff, B. Farber, C. A. Senalik, R. Ross, R. D. Seale","doi":"10.13073/fpj-d-20-00040","DOIUrl":"https://doi.org/10.13073/fpj-d-20-00040","url":null,"abstract":"\u0000 When discussing structural southern yellow pine lumber, questions frequently are asked regarding changes over time. This is a significant area of discussion given that structural lumber properties (i.e., design values) were changed around 2012. Climate change, forest management, genetics, processing, and others are listed among the many possible contributing factors. Of interest are these questions: (1) Are changes in bending properties permanent at some fundamental level, or are they somewhat dynamic and responsive to controllable factors? (2) To what degree have the basic southern pine wood mechanical properties changed over time? Related thereto, this research examines the bending properties of small clear pine specimens from three samples. Sample 1 was pulled from a production-weighted sample of in-grade parent lumber. Sample 2 was pulled from commercially available molding and millwork. Sample 3 was pulled from data from the U.S. Department of Agriculture Forestry Products Laboratory from the early to mid-1960s. The flexural properties of small clear specimens among the three samples showed some statistically significant differences. However, there was no clear trend regarding these differences. These results appear to support the notion that while the variability of pine's flexural properties is significant and that while many changes in forest management and production have occurred over the past five decades, the basic density and bending strength of clear southern pine appear generally stable over time.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43733246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Flame-retardant reed inorganic particleboard was prepared by hot-pressing with reed particles as a reinforcing material and using magnesite cement as an inorganic adhesive. The effects of inorganic sizing amount, density, and hot-pressing temperature and time on the properties of reed inorganic particleboard were investigated by orthogonal testing. Particleboard properties were tested and characterized by means of a universal mechanical testing machine, scanning electronic microscopy (SEM), X-ray diffraction (XRD), and cone calorimetry. The results showed that the mechanical properties of particleboard prepared under conditions of 60 percent sizing capacity, 100°C hot-pressing temperature, 15 minutes hot-pressing time, and 1.2 g/cm3 density were the best, reaching the national standard for cement particleboard. At 60 percent sizing, the characteristic peak value of inorganic adhesive hydrate crystal phase was the largest, the crystallization area dense and orderly, and the coating effect on shavings good; these attributes confirmed the trend of mechanical properties of reed shavings board increasing with sizing amount. Thus, the sizing amount had a significant influence on flame retardancy and smoke suppression performance of this particleboard. With an increased application amount, the heat release and total heat release rates of the particleboard and total smoke generation rate showed decreasing trends. Additionally, when the ignition time was delayed, the flame retardancy and smoke suppression performance of the particleboard was enhanced.
{"title":"Study on Performance of Flame Retardant and Smokeless Reed/Magnesite Cement Inorganic Particleboard","authors":"Zheng Xia, Li Peiqi, Lin Yunfei, Li Xingong","doi":"10.13073/fpj-d-20-00051","DOIUrl":"https://doi.org/10.13073/fpj-d-20-00051","url":null,"abstract":"\u0000 Flame-retardant reed inorganic particleboard was prepared by hot-pressing with reed particles as a reinforcing material and using magnesite cement as an inorganic adhesive. The effects of inorganic sizing amount, density, and hot-pressing temperature and time on the properties of reed inorganic particleboard were investigated by orthogonal testing. Particleboard properties were tested and characterized by means of a universal mechanical testing machine, scanning electronic microscopy (SEM), X-ray diffraction (XRD), and cone calorimetry. The results showed that the mechanical properties of particleboard prepared under conditions of 60 percent sizing capacity, 100°C hot-pressing temperature, 15 minutes hot-pressing time, and 1.2 g/cm3 density were the best, reaching the national standard for cement particleboard. At 60 percent sizing, the characteristic peak value of inorganic adhesive hydrate crystal phase was the largest, the crystallization area dense and orderly, and the coating effect on shavings good; these attributes confirmed the trend of mechanical properties of reed shavings board increasing with sizing amount. Thus, the sizing amount had a significant influence on flame retardancy and smoke suppression performance of this particleboard. With an increased application amount, the heat release and total heat release rates of the particleboard and total smoke generation rate showed decreasing trends. Additionally, when the ignition time was delayed, the flame retardancy and smoke suppression performance of the particleboard was enhanced.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44092725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Shmulsky, F. França, J. Ratcliff, B. Farber, Adam Senalik, R. Ross, R. D. Seale
Southern yellow pine (SYP) is one of the most used softwood species in the world. Most of this raw material come from fast-grown plantation trees. It is of interest to determine if SYP clear wood properties may have changed over the long term, in particular whether such properties may have declined. Herein, specific gravity (SG), ultimate compression strength parallel to grain (UCS‖), and UCS perpendicular to grain (UCS⊥) from three samples were compared: Sample 1 tested in 2014; Sample 2 from molding and millwork producers tested in 2017–2019; and Sample 3 from a study conducted in the mid-1960s. With respect to specific gravity (SG), the wood in Sample 1 was significantly lower than that from Samples 2 and 3. With respect to UCS‖, all three samples were statistically different. Adjusting to 12 percent moisture content had no influence on the mean separation of UCS‖. With respect to UCS⊥, no statistically significant differences were detected among the test data from any of the three samples. However, for the UCS data generated from the SG and moisture content–related model, Sample 2 was higher than Sample 3, and Sample 3 was higher than Sample 1, and these differences were statistically significant. Overall, these findings do not suggest that broad or consistent changes or declines of these wood strength properties have occurred during the past five decades.
{"title":"Compression Properties of Small Clear Southern Yellow Pine Specimens Tested across Five Decades","authors":"R. Shmulsky, F. França, J. Ratcliff, B. Farber, Adam Senalik, R. Ross, R. D. Seale","doi":"10.13073/fpj-d-20-00039","DOIUrl":"https://doi.org/10.13073/fpj-d-20-00039","url":null,"abstract":"\u0000 Southern yellow pine (SYP) is one of the most used softwood species in the world. Most of this raw material come from fast-grown plantation trees. It is of interest to determine if SYP clear wood properties may have changed over the long term, in particular whether such properties may have declined. Herein, specific gravity (SG), ultimate compression strength parallel to grain (UCS‖), and UCS perpendicular to grain (UCS⊥) from three samples were compared: Sample 1 tested in 2014; Sample 2 from molding and millwork producers tested in 2017–2019; and Sample 3 from a study conducted in the mid-1960s. With respect to specific gravity (SG), the wood in Sample 1 was significantly lower than that from Samples 2 and 3. With respect to UCS‖, all three samples were statistically different. Adjusting to 12 percent moisture content had no influence on the mean separation of UCS‖. With respect to UCS⊥, no statistically significant differences were detected among the test data from any of the three samples. However, for the UCS data generated from the SG and moisture content–related model, Sample 2 was higher than Sample 3, and Sample 3 was higher than Sample 1, and these differences were statistically significant. Overall, these findings do not suggest that broad or consistent changes or declines of these wood strength properties have occurred during the past five decades.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44325886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In 1990, Europe, North America, and the Asian democracies of Japan, Taiwan, and South Korea (JTK) were the major export markets for U.S. hardwood lumber and oak species accounted for 59 percent of total exports. In the 1990s, shipments to Europe and North America increased, while shipments to JTK declined. During the early 2000s, exports to China and Vietnam (CHV) increased. The worldwide recession of 2009 caused exports to decline in all regions, and oak species accounted for 37 percent of total shipments that year. Since 2010, CHV has become the most important export market for all species except maple. In 2020, oak species accounted for 43 percent of total export volume, and walnut ranked third in value of shipments. An examination of imputed prices found that exports tend to be composed of mid- to higher-quality hardwood lumber. Since 1997, real prices of exported lumber have declined for most species, and this decline occurred concurrently with increased U.S. sawtimber volume. In the 1990s, increased exports expanded the market for domestically produced hardwood lumber. Since the early 2000s, increased lumber exports have partially countered reduced domestic demand and have acted as a hedge against greater declines in overall demand for U.S. hardwood lumber.
{"title":"Regional Analysis of U.S. Lumber Exports for Important Hardwood Species from 1990 to 2020","authors":"W. Luppold, M. Bumgardner","doi":"10.13073/fpj-d-21-00001","DOIUrl":"https://doi.org/10.13073/fpj-d-21-00001","url":null,"abstract":"\u0000 In 1990, Europe, North America, and the Asian democracies of Japan, Taiwan, and South Korea (JTK) were the major export markets for U.S. hardwood lumber and oak species accounted for 59 percent of total exports. In the 1990s, shipments to Europe and North America increased, while shipments to JTK declined. During the early 2000s, exports to China and Vietnam (CHV) increased. The worldwide recession of 2009 caused exports to decline in all regions, and oak species accounted for 37 percent of total shipments that year. Since 2010, CHV has become the most important export market for all species except maple. In 2020, oak species accounted for 43 percent of total export volume, and walnut ranked third in value of shipments. An examination of imputed prices found that exports tend to be composed of mid- to higher-quality hardwood lumber. Since 1997, real prices of exported lumber have declined for most species, and this decline occurred concurrently with increased U.S. sawtimber volume. In the 1990s, increased exports expanded the market for domestically produced hardwood lumber. Since the early 2000s, increased lumber exports have partially countered reduced domestic demand and have acted as a hedge against greater declines in overall demand for U.S. hardwood lumber.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47444668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qingzheng Cheng, Juliet D. Tang, Chengfeng Zhou, Wei Jiang, Lixia Hu, D. Nicholas, B. Via
Soy flour was evaluated as a partial substitute for resin in the manufacture of oriented strand board (OSB), a wood-based composite that often replaces solid lumber and plywood in structural applications in the construction industry. Since the presence of soy could alter OSB biodegradation properties, termite resistance of OSB panels made with 0, 10, and 20 percent of polymeric methylene diphenyl diisocyanate (pMDI) resin substituted with soy flour (OSB0, OSB10, and OSB20, respectively) was investigated. Single choice tests between three types of OSB and southern yellow pine (SYP) solid wood and an OSB choice test (OSB0 vs. OSB10) were evaluated. Results indicated that termites always showed a preference for SYP, with the OSB becoming less palatable when soy flour was present. Percentage weight losses for OSB0, OSB10, and OSB20 were 5.7×, 8.4×, and 8.6× less, respectively, compared with SYP. In the absence of SYP, termites did not differentiate OSB0 from OSB10, with OSB10 showing 1.5× less weight loss compared with OSB0. Visual rating data supported weight loss data, except significantly less damage was only found when the choice paired SYP with OSB made with soy (OSB10 or OSB20). Termite consumption preference for SYP was explained by differences in water absorption kinetics. SYP reached saturation (105% moisture content) within 1 week on moist sand, while moisture content of OSB composites slowly climbed to 79 percent over 4 weeks, never reaching a plateau. Lower moisture content was due to the presence of water-repellent resin and wax in the OSB.
{"title":"Performance of Oriented Strand Board Made with Soy Substituted Resin in Termite Choice Tests with Southern Yellow Pine","authors":"Qingzheng Cheng, Juliet D. Tang, Chengfeng Zhou, Wei Jiang, Lixia Hu, D. Nicholas, B. Via","doi":"10.13073/fpj-d-21-00011","DOIUrl":"https://doi.org/10.13073/fpj-d-21-00011","url":null,"abstract":"\u0000 Soy flour was evaluated as a partial substitute for resin in the manufacture of oriented strand board (OSB), a wood-based composite that often replaces solid lumber and plywood in structural applications in the construction industry. Since the presence of soy could alter OSB biodegradation properties, termite resistance of OSB panels made with 0, 10, and 20 percent of polymeric methylene diphenyl diisocyanate (pMDI) resin substituted with soy flour (OSB0, OSB10, and OSB20, respectively) was investigated. Single choice tests between three types of OSB and southern yellow pine (SYP) solid wood and an OSB choice test (OSB0 vs. OSB10) were evaluated. Results indicated that termites always showed a preference for SYP, with the OSB becoming less palatable when soy flour was present. Percentage weight losses for OSB0, OSB10, and OSB20 were 5.7×, 8.4×, and 8.6× less, respectively, compared with SYP. In the absence of SYP, termites did not differentiate OSB0 from OSB10, with OSB10 showing 1.5× less weight loss compared with OSB0. Visual rating data supported weight loss data, except significantly less damage was only found when the choice paired SYP with OSB made with soy (OSB10 or OSB20). Termite consumption preference for SYP was explained by differences in water absorption kinetics. SYP reached saturation (105% moisture content) within 1 week on moist sand, while moisture content of OSB composites slowly climbed to 79 percent over 4 weeks, never reaching a plateau. Lower moisture content was due to the presence of water-repellent resin and wax in the OSB.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43407740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sticker stain is a material defect that results from moisture migration during wood drying, often spoiling the appearance of the surface of wood products. The effect of drying temperatures on the occurrence of surface sticker stain was investigated using Japanese cedar (Cryptomeria japonica D. Don) and three types of stickers (air-dried Japanese cedar, aluminum, and stainless steel) under four drying temperatures (20°C, 50°C, 75°C, and 100°C). At lower drying temperatures, the air-dried wood sticker tended to suppress the occurrence of surface sticker stains, whereas higher temperature or metal stickers produced sticker stains with deep color. However, no definitive relation was shown between the initial moisture content and the extent of sticker stain with deep color regardless of drying temperatures. It was considered that the partial delay of drying happened around the contact area with stickers, especially in cases of metal stickers. It was also found that the use of metal stickers at higher drying temperatures induced depressions in Fourier transform infrared spectra related to the occurrence of hygrothermal conditions.
粘污是木材干燥过程中水分迁移导致的材料缺陷，通常会破坏木制品表面的外观。以杉木(Cryptomeria japonica D. Don)和三种类型的杉木(风干杉木、铝材和不锈钢材)为材料，在20℃、50℃、75℃和100℃4种干燥温度下，研究了干燥温度对表面粘附染色的影响。在较低的干燥温度下，风干的木材不干胶倾向于抑制表面不干胶污渍的发生，而较高的温度或金属不干胶则会产生颜色较深的不干胶污渍。然而，无论干燥温度如何，初始水分含量与深颜色贴纸染色程度之间没有明确的关系。考虑到干燥的部分延迟发生在与贴纸接触的区域周围，特别是在金属贴纸的情况下。研究还发现，在较高的干燥温度下使用金属贴纸会导致傅里叶变换红外光谱的下降，这与湿热条件的发生有关。
{"title":"Effects of Drying Temperatures on the Occurrence of Sticker Stain in Japanese Cedar (Cryptomeria japonica D. Don)","authors":"Keisuke Toba, Toru Kanbayashi, Tomoya Murano","doi":"10.13073/fpj-d-20-00079","DOIUrl":"https://doi.org/10.13073/fpj-d-20-00079","url":null,"abstract":"Sticker stain is a material defect that results from moisture migration during wood drying, often spoiling the appearance of the surface of wood products. The effect of drying temperatures on the occurrence of surface sticker stain was investigated using Japanese cedar (Cryptomeria japonica D. Don) and three types of stickers (air-dried Japanese cedar, aluminum, and stainless steel) under four drying temperatures (20°C, 50°C, 75°C, and 100°C). At lower drying temperatures, the air-dried wood sticker tended to suppress the occurrence of surface sticker stains, whereas higher temperature or metal stickers produced sticker stains with deep color. However, no definitive relation was shown between the initial moisture content and the extent of sticker stain with deep color regardless of drying temperatures. It was considered that the partial delay of drying happened around the contact area with stickers, especially in cases of metal stickers. It was also found that the use of metal stickers at higher drying temperatures induced depressions in Fourier transform infrared spectra related to the occurrence of hygrothermal conditions.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42271949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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