The development of biomaterials-based adhesives is one of the main research directions for the wood-based material industry. In previous research, tannin and sucrose were used as adhesive to manufacture particleboard. However, the reaction conditions need to be optimized. In this study, sulfuric acid was added to the tannin–sucrose adhesive as a catalyst to improve the curing process. Thermal analysis, insoluble mass proportion, FT-IR, and solid state ¹³C NMR were used to investigate the effects of sulfuric acid on the curing behavior of tannin and sucrose. Thermal analysis showed weight loss and endotherm temperature reduced from 205 and 215 to 136 and 138 °C, respectively, by adding sulfuric acid. In case of the adhesive with pH = 1.0, the insoluble mass proportion achieved 81% at 160 °C, which was higher than the reference at 220 °C. FT-IR analysis of the uncured adhesives showed that adding sulfuric acid leads to hydrolysis of sucrose; then, glucose and fructose converted to 5-hydroxymehthylfurfural (HMF) and levulinic acid. Dimethylene ether bridges were observed by FT-IR analysis of the cured adhesives. The results of solid state ¹³C NMR spectrum indicated that 5-HMF participated in the curing process and formed methylene bridges with the C8 position of the resorcinol A-rings of tannin, whereas dimethylene ether bridges were detected as a major chemical chain of the polymer. Lab particleboards were produced using 20 wt % resin content at 180 °C and 10 min press time; the tannin–sucrose adhesive modified with sulfuric acid to pH = 1.0 exhibited better performance than the unmodified tannin–sucrose adhesive; the properties of the boards fulfilled the requirement of Japanese Industrial Standard (JIS) A5908 type 15.

The withdrawal and lateral holding properties of three types of plywood with one stapled as well as one-row multi-stapled joints were studied and compared. The results show that variations in plywood density have a significant effect on withdrawal strength and a relatively small effect on lateral holding strength. At four staples, the withdrawal strength of the eucalyptus plywood with a density of 0.59 g/cm³ is 1821 N, which is 21% higher than that of poplar plywood with a density of 0.51 g/cm³ at 1498 N and 32% higher than that of eucalyptus/poplar composite plywood with a density of 0.53 g/cm³ at 1275 N. In terms of lateral holding strength, eucalyptus plywood has a lateral holding strength of 1603 N 12% lower than the 1807 N of eucalyptus/poplar composite plywood and 10% lower than the 1761 N of poplar plywood. As the number of staples increased from 1 to 4 in increments of 1, the withdrawal strength of eucalyptus plywood continued to increase, while the nodal strengths of the poplar plywood as well as eucalyptus/poplar composite plywood did not differ significantly between 3 and 4 staples, and there is a significant increase in the lateral holding strength for all three plywood nodes. Equations for predicting the withdrawal and lateral holding strengths of one-row multi-stapled joints were derived separately.

This study on oriented strand board (OSB) wood doors with veneer as the door leaf aimed to investigate consumers’ preference for visual–tactile elements of OSB. First, we utilized the questionnaire and interview methods to extract specific elements as experimental variables for this study. Then, through subjective evaluation experiments and eye-movement experiments, as well as correlation analyses of the experimental results, we explored the relationship between the slice size, gloss, and color of oriented strand boards and consumers’ visual preferences and summarized the eye-movement indexes that can represent consumers’ aesthetic evaluation of the visual elements of oriented strand boards. Unidirectional haptic experiments analyzed the relationships between the slice size, gloss, and roughness of the oriented strand boards and consumers’ haptic preferences. The results showed that, visually, chip size and surface gloss had little effect on people’s subjective aesthetic evaluations of oriented strand-board wood doors. At the same time, the quantitative mean pupil diameter could represent consumers’ aesthetic evaluations of oriented strand boards. Regarding haptics, the size of the wood chips on the surface of the oriented strand-board specimens did not significantly correlate with participants’ haptic preferences. All participants’ tactile preferences for the unpainted specimens were positively correlated with the fineness of sanding. The visual and tactile effects presented on the surface of an object are essential factors that influence the perception of a material. Oriented strand board (OSB) has excellent advantages in providing a healthy and environmentally friendly living environment, so exploring the visual and tactile perception of OSB from the consumer’s point of view plays a vital role in promoting the use of OSB. The visual–tactile experimental results and the conclusions drawn from the analysis in this study can enable OSB to provide more opinions and potential information from consumers for the design of OSB wooden doors under the premise of conforming to the actual production and meeting the quality standards so that the designed and produced OSB wooden doors can satisfy the users’ preferences based on safety and stability.

This study takes the parent-child game behavior of children aged 3~6 and their parents as the research object, and extracts and summarizes the user behavioral needs of parents and children when they use game-based furniture together by using the questionnaire research method, observation method, and interview method. Based on the KJ method, 16 behavioral demand indicators were compiled by five furniture design students to construct a user behavioral demand system. In addition, AHP and entropy weight method were used to solve the user behavioral demand weights from subjective and objective perspectives in this study. Twenty experts and designers in this research field scored the indicators two by two and solved the subjective weights of user behavioral requirements according to the AHP algorithm. A seven-level Likert scale was used to design the questionnaire and distribute it to the parents of children aged 3–6 to fill in, and the 121 valid questionnaires obtained were used as raw data for entropy weighting to obtain the objective weights of user behavioral needs representing the opinions of interactive game-based furniture users. Finally, with 0.4 as the proportion coefficient of subjective weights, the subjective and objective weights were weighted to get the comprehensive weight value of each demand. The results show that the eight items with higher weights for user behavioral needs include: firm and stable, safe in use, comfortable for both parents and children, holding behavior by human-machine dimensions, able to sit on the ground and play, able to play face-to-face, easy to find for picking up, and sufficient operating space. In general, parent-child interactive game furniture firstly needs to meet the user’s needs for safety and comfort, and secondly needs to meet the user’s needs for the state of the game posture and the furniture size to meet the needs of the fetching and storage posture and the game space. The fuzzy comprehensive evaluation model established based on these needs can take into account the opinions of design experts and users at the same time and put the needs of children and parents in an equally important position so that the design of children’s play furniture can tend to meet the needs of parents and children when they use it together, and to promote parent-child interaction and the healthy growth of children.