共查询到20条相似文献，搜索用时 140 毫秒
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结合我国制材生产实际，在传统带锯工艺方案设计的基础上，借助经济滂和计算机，对带锯制材工艺进行方案优化设计。并开发出相应的应用软件，大大加了设计进度，增强制材工艺设计在招标、投标中的竞争能力，为实现制材工艺的优化设计，提供了有效的工具。 相似文献
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中、小径级原木制材工艺的探讨吴万荣，丁廷文（黑龙江省林产工业研究所）（东北林业大学）１目标我国目前中、小径级原木制材工艺的发展目标是围绕提高制材工业水平，侧重提高锯材出材率、加工规格质量和木材利用率，研制出适合我国国情的削片制材新工艺，并以此作为示范... 相似文献
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小径木削片制方机的研制 总被引：1，自引：0，他引：1
小径木削片制方机的研制（１５００４０）东北林业大学邢力平，马岩，汤晓华，蔡立新，金维珠，张建华目前，国内制材是以传统的带锯制材为主，由于带锯制材加工小径原木生产率低，功耗大，经济效益差，致使用带锯锯割小径木的企业普遍亏损。所以，现在国内带锯的制材工艺... 相似文献
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当前，结合我国林木资源特点和技术的发展，借鉴世界先进国家制材工业发展经验，采用新设备、新技术更新改造旧有落后的传统制材设备和工艺，针对人工林，中、小径级原木发展削片制材，扩大产品品种，提高木材的综合利用率，赶超世界先进水平，是我国制材工业正确的发展方向。 相似文献
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当前，结合我国林木资源特点和技术的发展，借鉴世界先进国家制材工业发展经验，采用新设备，新技术更新改造旧落后的传统制材设备和工艺，针对人工林，中，小径级原木发展削片制材，扩大产品品种，提高木材的综合利用，直超世界先进水平，是我国制材工业正确的发展方向。 相似文献
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洪德纯 《林业机械与木工设备》1999,(9)
原木圆锯机乃是将原木锯切成方（板）材和枕木等成材的木工机床，可作为制材生产的主锯机．众所周知，现在用于制材生产的原木，由于多为次生林材和人工林材，其径级普遍偏小，小径级原木比例大．采用常规的带锯机作为制材主锯机加工小径级原木，出材率和成材质量大为降低．我国由于传统观念和习惯势力之故，至今仍以常规的带锯机为制材主锯机．这是我国制材工业效益低的主要原因之一．因此，我国制材机械设备及工艺的改造和更新换代势在必行。自60年代开始，先进制材工业国家研制了多种类型的制材机械设备，尤其适合于中、小径级原木加工的… 相似文献
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针对目前带锯制材工艺设计中存在的几个问题进行分析和研究，合理地解决了制材工艺设计中下锯锯口数量、锯口分配、贮存台大小计算和运输设备运行速度计算等问题，并对工艺方案的评价和优选进行了探讨。 相似文献
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两千多年来,世界各国凡是要把原木剖成板、方材,总是离不开锯子。这种用锯子制材的工艺虽然出材率较高,但是存在着劳动生产率低、木材综合利用率低、板皮运输装置庞杂等缺点。这些缺点影响了制材工业向高生产率、高综合利用率和自动化方向发展。近十几年来,制材工艺出现了很大突破。削片制材新工艺正在部分地取代传统的锯剖制材工艺,使制材工业的面貌焕然一新。削片制材,就是利用特种刀具,将原木四周不宜成材的部分(锯材时的边皮)削成木片,以获取成材。削下来的木片可用作人造板或纸浆的原料。采用削片制材工艺可以克服锯剖制材的上述缺点。 相似文献
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以一种较为先进的小径材制材生产工艺流水线为例，分析各工艺流程与关健设备，为我国制材技术与装备的发展提供参考。 相似文献
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Tyron J. Venn 《Small-Scale Forestry》2004,3(3):431-451
The large and unutilised native forest timber resource on traditional Wik land on Cape York Peninsula, Australia, could be
managed for timber production to contribute to Wik socio-economic objectives. Wik elders have a set of forestry objectives
and envisage that these will be best achieved by a timber industry selling unprocessed logs and woodchips. On the other hand,
Balkanu Cape York Development Corporation, a government-funded indigenous community development organisation, anticipate that
an industry utilising high-technology equipment and producing dried and dressed finished products including strip-flooring
will best satisfy Wik forestry objectives. The Wilderness Society envisages small-scale ‘community development’ activities
such as protable sawmilling and niche market furniture manufacture as being appropriate types of forestry activities on Wik
land. Goal programming analysis of forest use opportunities indicates that Wik forestry objectives are unlikely to be best
satisfied by adopting the timber utilisation options espoused by any one of the stakeholder groups. 相似文献
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A stochastic frontier analysis of technical progress, efficiency change and productivity growth in the Pacific Northwest sawmill industry 总被引：2，自引：0，他引：2
Stochastic frontier analysis was employed to investigate technical efficiency and productivity growth in the sawmilling industry of the U.S. Pacific Northwest over the period 1968–2002. The results of our analysis indicate that productivity growth was strong over the 30-year study period, due almost exclusively to technical progress. The model developed in this analysis was used to examine the cause of employment declines in the sawmilling industry between 1988 and 1994. We found that that 62% of the decline was due to changes in output and non-labor input factors and 38% was due to technical change alone. 相似文献
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《Forest Policy and Economics》2000,1(3-4):301-313
The impacts of alternative levels of timber cuttings were evaluated by means of a fixed-price input–output model. The impacts were identified by means of backward linkages of forest-industry's output. The impact on output of consumption linkages in sawmilling outnumbered direct and indirect linkages in pulp and paper manufacturing marginally. Powerful income-generation effects in sawmilling also served to prove the importance of stumpage revenue. Extending sawn goods production created more jobs in all stages of the diffusion process. The discussion on the presumptions applied can assist in further research on the topic. 相似文献
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Utilization of softwoods in Great Britain 总被引：1，自引：0，他引：1
The change in scale in wood processing in the UK over the past70 years is huge. From a position where sawmilling was on smallscale satisfying local market needs with native broadleaf species,it is now a huge industry supplying about 26 per cent of oursawn softwood demand; mainly from the exotic, Sitka spruce. Development has seen the industry reach levels of technologyequivalent to those in the Nordic countries and north America. Seventy years ago the only board manufacturing plants were producingplywood from imported tropical logs. Now the board industriesproduce chipboards, strand boards, MDF and cement bonded particleboardsfrom the home grownresource. Overall we produce some 56 percent of UK consumption of these products whilst in the growingMDF sector home production represents 78 per cent of demand. The wood pulp industry has developed over the past 15–20years from a position where it had almost ceased to exist tothe present situation of large volumes of newsprint, magazinepapers, packaging board and fluting being produced, largelyon four capital intensive sites. The sawmilling, board manufacturing and pulp and paper industriesare mutually dependent upon one another for their successfuloperation. Residue material from sawmills, for example, providesan important income source, whilst the market for small roundwoodprovides cash flow for forest owners prior to felling of thefinal sawlog crop. 相似文献
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Portable sawmilling trials with Acacia aneura (mulga) and A. cambagei (gidgee) have been undertaken to estimate the private landholder costs associated with small-scale timber production from
woodlands in western Queensland, Australia. A time study of harvesting and milling operations facilitated estimation of landholder
labour input requirements. The scarcity and small size of millable logs, coupled with the prevalence of timber defects, make
harvesting and portable sawmilling of western Queensland acacias an expensive undertaking for landholders. The cost of producing
sawn timber that meets the High Feature (HF) grade of Australian Standard AS2796 is estimated at between A$3,000/m3 and A$3,400/m3 of HF timber. 相似文献
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Some possible contributions that could be made to the development of the Liberian economy through the forestry sector are investigated. Emphasis is placed on the establishment of integrated wood-processing facilities comprising sawmilling, veneer and plywood manufacturing and particleboard production. Data for 1974 are used to formulate a simple illustrative linear programming model for determining the minimum investment needs for achieving specified levels of value-added. 相似文献
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根据国内外相关文献,对聚脲涂料的应用与喷涂设备的发展现状做出总结.聚脲涂料近几年已经得到大力发展和广泛应用,但是目前国内针对此材料的喷涂设备的研发较为缓慢.为了解决目前聚脲涂料喷涂和填缝设备功能分离的问题以及一般喷枪难以进行清洗的问题,采用基础理论分析、液压设计、电气设计方法以及借助于CAD软件,设计出一款集喷涂、填缝、清洗等功能于一体的新型喷涂设备,完成了此设备的结构、液压系统、电气系统设计.此外,运用流体力学等理论知识推导出喷枪出口流量与压力方程.研究结果表明,将聚脲涂料的喷涂、填缝、清洗等功能集中在一台设备上是完全可行的. 相似文献
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本文简要叙述了中国橡胶木资源、板材防腐与干燥处理，家具及人造板生产等加工利用状况，并对今后开展橡胶木加工利用的研究及推广提出了建议。 相似文献