TH7595C3 - Manufacturing process of cement fiberboard from treated eucalyptus fibers - Google Patents

Abstract

DC60 (29/04/54) The production process of eucalyptus cement fiberboard is based on this invention. Is updated Quality of cement fiberboard By bringing eucalyptus wood fibers to undergo fiber conditioning by Method for leaching fibers by soaking fibers in lime (hydrated lime), milk of lime or lime water, sodium hydroxide, costomepo Caustic potash, or ammonium hydroxide (ammonium hydroxide) at a concentration of 0.25-5 for 0.5-48 hours to remove lignin. Or other inserts Contained in the wood which has Effect on the adhesion between Eucalyptus fibers and cement such as flour and sugar are then formed into the mixture as Cement fiberboard by cold pressing technique And curing the aforementioned fiberboard for 10-30 days to get the cement fiber with the pressure resistance. Modulus of elasticity and tensile strength perpendicular to Its surface is higher than cement veneer from untreated fibers. The production process of eucalyptus cement fiberboard is based on this invention. Is updated Quality of cement fiberboard By bringing eucalyptus wood fibers to undergo fiber conditioning by Method for leaching fibers by soaking fibers in lime (hydrated lime), milk of lime or lime water, sodium hydroxide, costomepo Caustic potash, ammonium hydroxide and a mixture of them at a concentration of 0.25-5 for 0.5-48 hours to remove lignin. Or other inserts Contained in the wood which has Effect on the adhesion between eucalyptus wood fibers and cement such as flour and sugar, and then forming the mixture into cement plywood fibers by cold pressing technique. And curing the aforementioned fiberboard for 10-30 days to get a fiber-cement sheet that has the pressure resistance. The modulus of elasticity and tensile strength perpendicular to the surface is higher than that of untreated fiber cement veneer.

Claims (5)

1.Production process of cement fiberboard That consists of steps A. Eucalyptus fiber pretreatment By means of washing (leaching) by soaking the fibers in the substance Choose from groups that include Lime (lime), hydrated lime water lime), lime water (milk of lime or lime water), sodium hydroxide, cystic potash (caustic potash), and ammonium hydroxide hydroxide) at a concentration of 0.25-5% for 0.5-48 hours. b. Forming a mixture containing Modified eucalyptus wood fibers from Article A with porcine cement, water and quality modifiers. To be cement fiberboard by Techniques of cold compression (cold press) at a specific compressive strength of 10-60 kg / cm2; c. Curing such fiberboard at room temperature for 10-30 days. 2.Production process of cement fiberboard According to claim 1, it also includes an additional sheet baking process. Such cured fiberboard cement was cured at 50-90 ° C for 1-12 hours and the humidification of the cured fiberboard was cured. By placing them at a temperature of 15-35 degrees Celsius for 5-24 hours 3.Production process of cement fiberboard According to claim 1 or 2, where such eucalyptus fibers were prepared by pulping or defibering or fiberizing pieces of eucalyptus wood into fibers (fibers) or groups of Fiber bundles by the Asplund process or Defibrator process at a temperature of 150-200 ํ C for 3-10 minutes and finely grinded the fibers to get the density. It is free of the fibers as needed. 4.Production process of cement fiberboard According to any one of the 1 to 3 claims Where the eucalyptus fibers have a fiber independence value of 10-21 DS. 5.Production process of cement fiberboard According to any 1 to 4 claim Where the cold compression Using a specific compressive force of 10-60 kg / cm2