共查询到20条相似文献,搜索用时 140 毫秒
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定向成材发展概况及前景分析 总被引:1,自引:0,他引:1
定向成材发展概况及前景分析东北林业大学金维洙蔡立新中国林业物资供销总公司王世雄定向成材或称单板条平行胶合材(Par-alelstrandlumber,商品名Paralam,简称PSL)是由窄单板条涂胶后顺纹平行铺装热压而成的新型人造成材,可作为装饰和... 相似文献
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橡胶木成材干燥工艺改进张斌橡胶木的综合利用在我国始于80年代,而且发展较快。但也存在一些问题,就海南地区的加工企业来说,其特点是简易小型化,年加工量超过3000m ̄3的加工厂很少。根源在于成材干燥工艺较落后,大多采用简陋的土窑。只有少部份工厂是引进国... 相似文献
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单板滑雪平行大回转是一项对于选手体能有着较高要求的项目,所以还需要对相关运动员加强训练,以更好的符合相关运动的标准。文章将针对这一方面的内容展开论述,详细分析了单板滑雪平行大回转的体能训练重难点,旨在为今后相关工作的开展与进行奠定坚实的基础,并且以此为核心,更好的促进单板滑雪平行大回转项目向前发展,使得项目的竞技性得到增强,并且促进相关技术技巧性的提高。 相似文献
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阐述钢丝无酸洗一火成材生产工艺及技术关键 ,采用该生产工艺减少热处理和酸洗次数 ,缩短生产周期 ,产量、质量提高 ,生产成本下降。按年产 2 5万t钢丝计 ,每年可直接降低成本 470万元以上 相似文献
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单板纵向接长是单板层积材(LVL)生产的核心环节,单板斜接质量的好坏直接影响生产效率、产品外观质量和内在强度。本文探讨了非结构用杨木LVL产品中的单板斜接生产工艺改进方法,由使用酚醛树脂胶改为三聚氰胺改性脲醛树脂胶,并验证了其可行性。 相似文献
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Laminated veneer lumber (LVL) was laboratory manufactured using veneers from decay and non decay resistant species in order to evaluate changes in the durability as a result of the LVL manufacturing process, and to test if the mixing of decay resistant species and non decay resistant species can improve durability. Laboratory soil block test and field test were conducted. The durability of solid wood was comparable to that of LVL made using the same species. For LVL made using veneer from durable and non-durable wood species, durability was improved when two faces and one core veneers were from decay resistant species. 相似文献
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A novel method is described to measure surface height profiles of lumber boards while they travel along a conveyor in a sawmill. Both surfaces of the board are identified independently, even on non-ideal conveyors where there are lateral motions relative to the sensors. Separate surface measurements are very useful for product quality control because each side of a piece of lumber is typically cut by a different tool. Therefore, such measurements open important new opportunities for machine fault diagnosis. The surface height profile measurement method uses multiple sequential sensors and a mathematical method based on linear inverse theory to separate surface profile information from lateral motions. The method was implemented using industrial-style laser sensors, and was effective both in the laboratory and in tests on the cant line of a large sawmill cutting dimension lumber. 相似文献
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