in order to increase its hardness and gravity as well as dimension stability, the technology of hotcompressing on P8ulownla wood was studied. The main factors of affecting the spring back of the compressedPaulownis sa...in order to increase its hardness and gravity as well as dimension stability, the technology of hotcompressing on P8ulownla wood was studied. The main factors of affecting the spring back of the compressedPaulownis samples were discussed. It was discovered that every factor in the experiment had obvious effects onwood hardness and dimension stability of compressed wood. When the MC (Moisture Content) of experimentalspecimens was 13.89%, it was useful to spray water on the surface of samples before hot pressing. The best reSult was the recovery of compression set could decrease from 90.69O/O of untreated wood to 45.51 % of soakingspecimens into PF (Phenol Formaldehyde) water solution. The hot pressing time was 8 min at 190℃.展开更多
Impacts of acid and alkali on paulownia wood are studied, and the effects of weak alkali solutionon stain prevention of paulownia wood are tested and analyzed. It shows that pH value affects paulowniawood color, and t...Impacts of acid and alkali on paulownia wood are studied, and the effects of weak alkali solutionon stain prevention of paulownia wood are tested and analyzed. It shows that pH value affects paulowniawood color, and that white value of paulownia wood is prone to decrease and chromatism rises underacidity condition. Under alkalescence condition, whiteness of paulownia wood rises and chromatismdecreases, color and luster obviously tend to be bright. The alkali solution with concentration of 0.25% canpromote the penetrability of paulownia wood, dissolve some extractives containing stain precursor chemicals,strengthen stain prevention of paulownia wood, but can not contaminate board surface. Anti-stain reagenthas effect on prevention stain of paulownia wood, but only using it for controlling paulownia wood stainwill induce stain-returning phenomenon. Using both weak alkali solution and anti-stain reagent has bettereffect than just using reagent, the treatment by concentration of 0.25% weak alkali solution with anti-stainreagent can make controlling effect even both inside and outside.展开更多
文摘in order to increase its hardness and gravity as well as dimension stability, the technology of hotcompressing on P8ulownla wood was studied. The main factors of affecting the spring back of the compressedPaulownis samples were discussed. It was discovered that every factor in the experiment had obvious effects onwood hardness and dimension stability of compressed wood. When the MC (Moisture Content) of experimentalspecimens was 13.89%, it was useful to spray water on the surface of samples before hot pressing. The best reSult was the recovery of compression set could decrease from 90.69O/O of untreated wood to 45.51 % of soakingspecimens into PF (Phenol Formaldehyde) water solution. The hot pressing time was 8 min at 190℃.
文摘Impacts of acid and alkali on paulownia wood are studied, and the effects of weak alkali solutionon stain prevention of paulownia wood are tested and analyzed. It shows that pH value affects paulowniawood color, and that white value of paulownia wood is prone to decrease and chromatism rises underacidity condition. Under alkalescence condition, whiteness of paulownia wood rises and chromatismdecreases, color and luster obviously tend to be bright. The alkali solution with concentration of 0.25% canpromote the penetrability of paulownia wood, dissolve some extractives containing stain precursor chemicals,strengthen stain prevention of paulownia wood, but can not contaminate board surface. Anti-stain reagenthas effect on prevention stain of paulownia wood, but only using it for controlling paulownia wood stainwill induce stain-returning phenomenon. Using both weak alkali solution and anti-stain reagent has bettereffect than just using reagent, the treatment by concentration of 0.25% weak alkali solution with anti-stainreagent can make controlling effect even both inside and outside.