| China is a large agricultural production country.With the development of economy and society,a large amount of biomass resources such as crop straws,agricultural product processing wastes,and forestry residues are not fully utilized every year.Not only a lot of precious resources are wasted,but also a great pollution to the environment.The use of biomass plant fibers as raw materials and the use of hot-press forming technology to produce man-made plates is one of the important ways for the comprehensive utilization of biomass raw materials.However,due to the addition of phenolic resin and other adhesives during the hot-pressing process,toxic substances are released during use and placement,which is extremely harmful.Therefore,the development of self-bonding hot-pressing technology has important application value and research significance.This thesis selects low-cost,resource-rich fiberboard,fiber powder,peanut straw,pine needles,tea residue and waste paperboard as raw materials.It does not use adhesives,and uses self-developed new hot-press tube making machines to make self-bonding Hot-pressed fiber tube replaces the widely used paper core tube.According to the thermoforming mechanism of the fiber,the system design and debugging of the structure of the hot-pressing tube machine were carried out,and a set of automatic hot-pressing equipment for self-bonding fiber core tube was developed.On this basis,the raw material formula and production process were optimized with mechanical properties as indicators.The anti-mold properties of several formulations and the anti-mold treatment process before and after the hot pressing of the fiber tube were studied.The main research contents and conclusions are as follows:1.Design and debug the fully automatic non-rubber fiber core tube hot-pressing machine.The equipment is composed of driving device,silo,extrusion device,forming device,clamping device,cutting device and control system.All actions of the whole machine are automatically controlled.The hot-pressing parameters meet the requirements of natural fiber thermoforming,and have achieved fully automatic industrial production;2.The influence of main parameters of self-bonding hot-press molding on fiber tube was studied.Based on sensory evaluation and compressive strength,the raw material formula and hot-pressing temperature were optimized to obtain four better formulas and hot pressing temperature:Formula 1: 70% fiberboard + 20% fiber powder + 10% tea residue + 2% paraffin,hot pressing temperature 180 ℃Formula 2: 70% fiberboard + 20% peanut straw + 10% pine needles+ 2% paraffin;hot pressing temperature: 170 ℃Formula 3: 60% fiberboard + 40%pine needles+ 2% paraffin;hot pressing temperature:180 ℃Formula 4: 20% waste cardboard + 50% fiberboard + 20% fiber powder + 10% pine needles+ 2% paraffin;hot pressing temperature 180 ℃ or 190 ℃3.The effect of the formula on the anti-mold properties of the fiber tube was studied.The results show that among several main materials,tea dregs and peanut straw are very susceptible to mold,while waste paperboard is the least susceptible to mold.Pine needles have a certain effect of inhibiting mold.The study found that the fiber tubes with more materials that are less likely to be moldy have better mold resistance,and the tube produced by the fourth formula in the above four formulas has the best mold resistance.4.The anti-mildew effect of chemical or physical treatment before and after the hot pressing of the fiber tube was studied.The results show that the addition of anti-mold agents before and during the hot-pressing process does not substantially improve the anti-mold properties of the fiber tubes.After the tube is formed,brushing the surface of the fiber tube with glue + mold inhibitor,applying a sticker operation to the fiber tube or bagging the fiber tube can greatly extend the mold time of the fiber tube. |
