共查询到19条相似文献,搜索用时 187 毫秒
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试论废纸回收再生与森林资源及环境保护 总被引:1,自引:0,他引:1
废纸回收再生对森林资源的保护和再生在工业化发展的今天具有十分重要的意义,本文通过对我国森林资源保护现状和废纸回收利用的现状介绍分析了废纸回收利用对资源和环境保护的意义,并提出恢复森林绿化的建议。 相似文献
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废纸回收利用技术的现状与未来发展方向探讨 总被引:4,自引:0,他引:4
在当前纸业原料结构调整和生态保护的大环境下,简要介绍了国际、国内废纸回收利用的市场和技术发展现状,指出了未来废纸回用技术的发展方向。 相似文献
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对废纸再生的几点思考 总被引:1,自引:0,他引:1
结合当前纸业原料结构和我国生态保护的现状 ,分析了废纸再生的重要意义。简要介绍了国际、国内废纸再生的发展概况 ,并对我国废纸再生事业的发展提出了几点建议。 相似文献
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废纸和森林的关系极为密切,这是因为森林生长木材,木材能制造纸张,纸张经使用又变成废纸。因此,如将废纸回收利用,就可以少采伐森林了。 为了减少森林资源的采伐量,当前,世界上许多国家十分重视废纸的再利用,已开始从单纯依靠采伐林木资源到依靠废纸再生利用的转变,且已取得可喜的成果。如绿色之国日本,森林覆盖率达68%,森林资源十分丰富,然而他们对纸张回收工作十分重视。日本全国上下有一套行之有效的废纸回收措施和收购网点。废纸回收率已达76%。美国利用废纸成绩更显著,每年利用达4200万吨。据测算:每回收一吨废纸,相当于少砍10株树木(约4立米木材),节电400度,节煤400公斤,节水300吨,节烧碱400公斤。美国还建成了以废纸为原料制取酒精、葡萄糖,加工禽畜饲料的工厂。目前,我国每年造纸约700多万吨,每年回收废纸196万吨,可节约木材360万立米,我国的废纸回收率仅达28%,这和世界先进国家相比回收率还很低,大有潜力可挖。 我国森林资源贫乏,人均占有量在世界居120位,大大低于世界人均水平。而每年用于造纸的木材 相似文献
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水热处理对废弃刨花板的刨花形态及其再循环利用性能的影响 总被引:5,自引:2,他引:3
刨花形态和刨花板的再循环利用在再生刨花板的制造过程中具有重要作用。本文讨论了在备料前对废弃刨花板进行热处理的新工艺,分析了水热处理工艺对再生刨花的形态、吸水性及再胶合性能的影响。研究结果表明,采用水热处理工艺制备的再生刨花所压制的刨花板性能接近于原生刨花板;再生刨花有良好的再胶合性能。 相似文献
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采用傅里叶变换红外光谱技术对由废弃刨花板制备的再生刨花中已固化脲醛树脂的分布及其活性进行了研究。结果表明,已固化的脲醛树脂主要分布在细刨花中,中粗刨花中极少存在,已固化的脲醛树脂仍有活性基因存在,并有助于再生刨花的再胶合及降低再生刨花板中的游离甲醛释放量。 相似文献
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Min-Kug Hong Muhammad Adly Rahandi Lubis Chang Hyun Sohn Jeongkwan Roh 《Wood material science & engineering》2020,15(3):163-171
ABSTRACTHigh global production of medium-density fiberboard (MDF) in recent years could generate an equal quantity of waste MDF at the end of its service life, requiring recycling of waste MDF instead of landfilling or incineration. This study investigated effects of the addition of recycled fiber (RF) obtained from surface laminated MDFs with three different materials to the properties of three-layer recycled MDF (rMDF). Three types of surface laminates such as low-pressure laminate, polyethylene terephthalate, and polyester coating were hammer milled, and then went through a patent-pending fiber recovery system to obtain the resultant RFs that were added to the core layer of rMDF. These RFs at three contents (10, 20, and 30%) were blended with 12% of urea-formaldehyde (UF) resin prior to hot-pressing. Statistical analysis showed that the best internal bonding strength, modulus of rupture, and modulus of elasticity of rMDF panels were obtained for LPL-rMDF with a 20% RF content. Thickness swelling, water absorption, and formaldehyde emission of rMDF were reduced by increasing the RF content. These findings suggest that a minimum RF content of 20% can be replaced with virgin fibers for the rMDF manufacture, indicating the feasibility of recycling waste laminated MDF into three-layer rMDF. 相似文献
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为有效提升资源的综合利用能力,必须全面加强再生资源的综合利用效能。经过科研人员不断的技术探索,在废旧木材资源与再生纤维加工上实现了较大突破,很多技术也已实现了商业成果转换。介绍了废旧木材资源再生渠道,分析了再生纤维素纤维利用概况,在此基础上,对再生纤维利用发展趋势进行了展望。 相似文献
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绿色生态、节能环保型人造板机械开发方向 总被引:2,自引:0,他引:2
绿色生态机床与节能环保设备是现代机械发展的趋势。对绿色生态与节能环保型人造板机械开发方向进行了探讨,指出绿色生态人造板机械由再生材料制造,其质量和体积由于使用再生材料可减少50%以上,通过减轻移动部件质量使功率消耗减少30%~40%,节能减排,废弃物少,报废后可回收。论述了我国人造板机械行业节能减排的总体措施与方向。 相似文献
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The purpose of this paper is to estimate the environmental value of recycled wood wastes using conjoint analysis. Conjoint
analysis is one of many multi-attribute preference-elicitation techniques widely used in market research. A comparison of
the pair-wise rating method and the choice experiment elicitation method is made. An empirical study estimates the value of
recycled water cleaners using pair-wise rating and choice experiments. Water cleaners have many attributes, including their
cleaning performance, replacement time, size, color, and price. Existing water-cleaning filters use propylene or polyethylene,
which are made from petroleum resources. These filters become waste after being replaced. Another type of water-cleaning filter
is being developed, known as a “recycled filter,” which is made from construction industry wood wastes and logs from thinning.
This recycled filter can subsequently be dissolved by bacteria. An empirical study of recycled water-cleaning filters made
from wood wastes shows that recycling has significant value as estimated by both pair-wise rating and choice experiments.
However, the estimated marginal willingness to pay for recycling differs between the two methods. It may be that profile design
effects appear in our survey. 相似文献