Study On Laser Cutting And Hot Pressing Technology Of Light Color Parquet Veneer

Thin wood parquet veneer is one of the important surface decoration methods for current wood products and furniture.Beautiful wood grain thin wood is cut by machines,spliced into beautifully shaped parquet thin wood,and then pressed onto the surface of the substrate to obtain beautifully decorated wood products.Light colored parquet veneer has problems such as easy yellowing,poor adhesive penetration,and poor water resistance when laser cutting edges and veneers.This study improves and optimizes the process by using nitrogen protection,adhesive modification,and high-density polyethylene film instead of liquid adhesive to improve the shortcomings in traditional processes and enhance product quality.The main research content and conclusions are as follows:(1)In response to the problem of yellowing of thin wood edges caused by laser cutting of light colored thin wood parquet,the significant effects of cutting speed,cutting power,and protective gas nitrogen flow rate on the color difference value of thin wood and the optimal cutting process were studied through single factor experiments and orthogonal experiments.The single factor experimental results indicate that the color difference value of the thin wood cutting edge decreases with the increase of cutting speed,cutting power,and protective gas nitrogen flow rate.The orthogonal experimental results show that the cutting speed has the most significant impact on the color difference value of the thin wood cutting edge,followed by the cutting power,and finally the protective gas nitrogen flow rate.The optimal optimization process is:speed 10 mm/s,power 1600 W,and nitrogen 200 mL/min.(2)Due to the large number of gaps in the parquet thin wood,there are problems with adhesive penetration and poor water resistance during gluing.In view of this situation,the adhesive modification research was carried out,with polyvinyl acetate lotion(emulsion white glue)as the main part,adding water-based epoxy resin and its blending modification,calcium carbonate powder as the filler,and the proportion of water-based epoxy resin in the adhesive,hot pressing temperature,and hot pressing pressure were optimized through orthogonal experiments,to explore its significant influence on the glue permeability and water resistance of parquet veneers and the optimal process.The single factor experiment of modified hot pressing with calcium carbonate powder adhesive shows that the adhesive penetration of parquet veneer decreases with the increase of the proportion of calcium carbonate powder in the adhesive,and the optimal addition ratio of calcium carbonate powder is 10%.The orthogonal experimental results show that the epoxy resin ratio and hot pressing pressure in the adhesive have a significant impact on the water resistance of patterned thin wood decorative panels,with the hot pressing pressure having the most significant impact,followed by the epoxy resin ratio.The optimal optimization process is as follows:epoxy resin ratio of 4%,hot pressing pressure of 1.2 MPa,and hot pressing temperature of 130℃.The decorative panel made by this process has the lowest adhesive penetration rate and meets the national Class III decorative veneer artificial board standard.(3)In order to further avoid the problems of light colored patterned thin wood veneer caused by liquid adhesive such as adhesive penetration,poor water resistance,and surface color deepening caused by high-temperature hot pressing,high-density polyethylene film was used as the hot pressing adhesive material instead of the adhesive.Single factor experiments and response surface experiments were conducted using hot pressing temperature,hot pressing force,and hot pressing time as experimental factors.The single factor experimental results indicate that the color difference value of the veneer surface increases with the increase of hot pressing temperature,pressure,and time.The hot pressing temperature has the most significant impact on the surface color of the veneer surface,followed by hot pressing time and pressure.The response surface experiment results show that the interaction between hot pressing temperature and pressure has a significant impact on the surface color of the decorative panel.The optimal optimization process is:hot pressing temperature 135℃,hot pressing pressure 1.2 MPa,and hot pressing time 5 minutes.The surface color difference of the mosaic decorative panel produced using this process is the lowest,and its water resistance meets the national Class II decorative veneer artificial board standard.In summary,this study focuses on the problems of surface color deepening,adhesive penetration,and poor water resistance in the production process of light colored patterned thin wood products.Through single factor experiments,orthogonal experiments,and response surface experiments,the optimal optimization process is studied to effectively improve the various problems of light colored patterned thin wood products,providing a technical support for improving product quality and use value,and increasing economic benefits.