WOOD RESEARCH Volume 67, Number 3, 2022
Xu Sheng, Xu Peng, Du Yuting, and Zhao Puqi

Short notes: A research on the application of industrial by-product calcium sulfate whiskers in paper filling

The basic properties of calcium sulfate whiskers were studied and compared with commercial ground calcium carbonate (GCC) fillers. The modified whiskers were used for paper filling and compared with a commercial precipitated calcium carbonate (PCC). As a result, it shows that when the unmodified calcium sulfate whisker is used to fill the paper, the ash content of the handmade sheet is low because of its dissolution problem. The ash content of the paper increased obviously when the modified calcium sulfate whisker was added, which reached the ash level of PCC filling. In addition, the paper strength increased greatly, but the light scattering coefficient decreased. In addition, the strength property of the modified calcium sulfate whisker filling paper is basically the same as that of the PCC filling paper with 14.99% ash content when the ash content of the modified calcium sulfate whisker filling paper is 21.95%.

WOOD RESEARCH Volume 67, Number 2, 2022
Kang Zhou, LI LUO, and Bin Na

Study on flame retardant leach resistant of modified poplar wood

After flame retardant and enhancing treatment, fast-grown poplar face the problem of leaching of pharmacy, which affected the effective permanence of the retard and further use is limited. In this paper, we study the fixed effect of low molecule phenol-formaldehyde (PF) resin on nitrogen and phosphorus (N-P) inorganic flame retardant composite under the condition of high relative humidity. The change of lateral sizes and quality of the specimens were emphasized in the experiment. Results reveal that the greater the concentration of flame retardant was, the greater weight gain percentage of the samples was, and the more serious leach was in the test, after the specimen was modified with the flame retardant. When weight gain percentage of the specimens is same, the greater the concentration of PF resin test solution was, better effect of the leach resistant will be obtained with the concentration of PF test solution increased. The PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards. From the comparative analysis above, it was advisable to indicate the PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards.

WOOD RESEARCH Volume 61, Number 3, 2016
Weiyi Li, Lijuan Zhao, Qiuhui Zhang, and Guangjie Zhao

Flame retardance and antibacterial performance of wooden wallpaper treated with composite modifying agent

To improve the flame retardance and antibacterial properties of wooden wallpaper, a composite modifying agent, containing primarily a phosphorus-nitrogen flame retardant (APP/PER/GP), synergistic and smoke suppression agent (OMMT) and silver loaded with nano TiO2 (Ag-TiO2), was prepared and applied to the wooden wallpaper using an ultrasonic immersion method. The combustion performance (including smoke suppression performance), antibacterial activity and the surface micrographs of the flame retardant/antibacterial wooden wallpaper (FRAW) were investigated and characterized using a cone calorimeter test (CCT), antibacterial rate (AT) and inhibition zone, atomic force microscope (AFM), field emission scanning electron microscope (FE-SEM) and energy dispersive spectrometer (EDS). Furthermore, CIE1976 (L* a* b*) color system was used to estimate the surface color change of the FRAW. It was found that the composite modifier distributed on the surface of FRAW with a micrometer, improved the flame retardance of FRAW, but also improved its antibacterial property. In addition, the smoke release behavior of the FRAW indicated that OMMT had good smoke suppression properties. Furthermore, the result of color difference test showed that the flame retardant and antibacterial treatment had little effect on the decorative appeal of the wooden wallpaper.

WOOD RESEARCH Volume 65, Number 6, 2020
Lin Yang, Tianqi Han, and Yudong Fu

Effect of heat treatment and wax impregnation on dimensional stability of Pterocarpus macrocarpus wood

In order to improve dimensional stability and control deformation, heat treatment (HT) and wax impregnation (WI) were conducted to large size boards (LB) of Pterocarpus macrocarpus and the tangential swelling were compared in various relative humidity (RH) conditions. The results show that the tangential swelling and shrinking of control group and treated group performed differently corresponded to various relative humidity (RH). Comparing with control group, the swelling ratio of HT combined WI group was much less, and followed by 180°C-3h HT group. The maximum swelling ratio decreased by 31% and 29% in humidity chamber and indoor conditions respectively. The swelling ratio was affected by size of samples, LB showed smaller welling ratio than small sample. Wax filled in cell cavities and presented uneven distributions after impregnation. The rate of wood hygroscopicity was reduced after HT combined WI treatment which was an effective method on improvement of wood dimensional stability.