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題名 | 實木蒸汽彎曲之研究= |
---|---|
作者 | 黃清吟; |
期刊 | 林業試驗所研究報告季刊 |
出版日期 | 19880600 |
卷期 | 3:2 1988.06[民77.06] |
頁次 | 頁99-120 |
分類號 | 474.2 |
語文 | chi |
關鍵詞 | 實木; 蒸汽; 彎曲; |
中文摘要 | 本研究旨在探求常用加工樹種之彎曲適性。以省產木荷及相思樹為材 料,於飽水狀態下蒸汽處理30分鐘,再以滾輪式彎曲成型機彎曲並置於烘箱中 乾燥成型,拆卸模具之同時即逐一評估其缺點種類及彎曲品等,復存放於室溫之 變化溫濕度條件下歷時八週,定期記錄觀察曲率半徑及含水率之經時變化情形, 以此探討樹種曲率半徑、截角與否、厚度、成型溫度等因子之影響,試驗結果歸 納如下: 1.厚度及曲率半徑影響實木之彎曲成功率,厚度愈小曲率半徑愈大,彎曲成功率 愈大,截角與否則不具效應。 2.木荷之彎曲適性優於相思樹,允宜推廣。惟其乾燥缺點仍待克服。 3.延長蒸汽處理時間可望充分軟化相思樹提昇其彎曲成功率。 4.二樹種在乾燥成型後之存放初期,復元性並無顯著差異,八週後則出現明顯之 歧異,木荷為spring in,相思樹為spring back。曲率半徑僅影響初期復元性。 5.含水率與存貯時間之對數成線性相關,復元率與含水率、存貯時間均呈二次曲 線相關。 |
英文摘要 | The trend of Taiwan's furniture industry is moving toward high- quality items. Upgrading the processing technique is an urgent task. Bentwood furniture originated a century ago and is still popular in certain foreign markets. The major limitation of Taiwan's bentwood furniture makers is poor bending techniques which lead to few defect-free parts and raised the cost of production. The purposes of the studies were to evaluate the bendability of some local commercial woods and the feasibility of producing defect-free bentwood parts from them. Chinese guger-tree (Schima superba) and Taiwan acacia (Acacia confusa) materials were sawn and planed into test specimens 5.5 by 2 or 3 cm in cross section. The lengths of the pieces depended on the bending curvatures. The specimens were kept in a water-saturated condition and plasticized with 100℃ steam at 1.5kg/cm^2 pressure for 30 min. After steaming, the materials were transferred quickly to a roller- type solid wood bending equipment, bent, then set and dried under restraint in an oven for 20 to 22 hrs. Right after the molds were removed, the bending ratings and the kinds of failures were recorded. During the storage duration under room conditions for eight weeks, the curvature deviations were checked periodically. The results indicated that: 1.The bending ratings of Chinese guger-tree were influenced by the thickness of the specimens and its curvature. Percentage of acceptable bent stocks increased with decreasing thickness and increasing radius. The bending ratings of the specimens were similar, irrespective of bevelling. 2.Chinese guger-tree was easier to bend than Taiwan acacia. It could be used to make good quality bentwood furniture, provided its drying problems be solved. 3.Prolonged steaming may improve the bending ratings of Taiwan acacia. 4.At the start of storage, the percentages of curvature recovery (spring back) were roughly the same for the two species. After 8 weeks storage they tended to differ as Chinese guger-tree sprang in (decrease in radius), and Taiwan acacia sprang back (increase in radius). Statistical analysis also indicated that the final curvatures of the bent stocks correlated with the degrees of instantaneous recovery. 5.There were second order relationships between recovery and moisture content and storage days, respectively. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。