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題名 | 高週波加熱粒片板之研製(2):粒片板坯之溫度與含水率變化 |
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作者姓名(中文) | 黃耀富; 林錦盛; | 書刊名 | 林產工業 |
卷期 | 13:4 1994.12[民83.12] |
頁次 | 頁573-599 |
分類號 | 474.5 |
關鍵詞 | 高週波加熱; 含水率分佈; 三層構造粒片板; 粒片板坯升溫; 水分移動; High-frequency heating; Moisture distribution; Three-layer structure particleborard; Temperature rising in particle-mat; Moistrue movement; |
語文 | 中文(Chinese) |
中文摘要 | 木油桐("Aleurites montana" (Lour.) Wils)為原料,使用水溶性酚甲醛樹脂膠合劑,以高週波加熱製造比重為0.60之三層構造粒片板;用膠量(6, 8及10%)與含水率組合變化為外側高中央低(15%-10%-15%及20%-15%-20%),外側低中央高(10%-15%-10%及15%-20%-15%),及含水率均勻(13,及17%)等粒片板坯的條件,探討單層及複合層粒片板坯之誘電特性對其高週波加熱時升溫與含水率之影響;結果如下:1. 各種條件之粒片板坯在高週波電場中之發熱狀態均與高週波發熱原理相符合。2. 粒片板坯之用膠量及比重相同之情況下,(1)含水率之組合為外側高中央低(15%-10%-15%及20%-15%-20%)時,外側升溫較快、水分移動快且略有向中央移動之趨勢。(2)含水率之組合為外側低中央高(10%-15%-10%及15%-20%-15%)時,心層升溫快、水分移動快,利於水分之排出及整體板坯之升溫。(3)含水率相同且均為13及17%時,其板坯各部位,不論是外側或中央皆是心層升溫快含水率下降亦快,對板坯升溫與水分之排除有利。3. 粒片板坯之比重及含水率相同,用膠量不同(6、8及10%)時,用膠量高者發熱效率表現於快速降低板坯含水率,而非於加熱初期迅速提高板坯溫度。 |
英文摘要 | Three-layer parrticleboards were made with panel density of 0.60g/cm^3. The resin content (RC) level is 6%, 8% and 10%, respectively. The initial moisture content (MC) distribution of particle-mat in each layer is considered as (1) higher MC both in the side parts (right and left side) of mat and lower MC in the center part of mat (15%-10%-15% and 20%-15%-20%), (2) lower MC both in the side parts of mat and higher MC in the center part of mat (10%-15%-10% and 15%-20%-15%) and (3) MC distributed evenly in the mat (13%-13%-13% and 17%-17%-17%). By using wood oil tree ("Aleurites montana") (Lour.) Wills) as raw materials, water soluble phenol formaldehyde resin adhesive (PF) as glue, the particleboard is fabricated with high-frequency (HF) heating process. The effect of the dielectrical properties of particle-mat on the temperature and MC of particle-mat by HF heating is investigated first. And then the comparison was made for the factors of RC level and initial MC distribution of particle-mat affected on the behaviors of high-frequency heating. The results were summarized as follows: 1. The experimental temperature data of rising process of particle-mat by high-frequency heating of all treatments are match with the theory. 2. Based on the same RC level and dendity of particle-mat: (1) For the case of initial MC distribution is higher in the outside parts and lower in the center parts of mat (15%-10%-15% and 20%-15%-20%), the temperature of the outside parts was raising faster than that of center part and the moisture in side parts were transfered to center part during HF heating. (2) For the case of initial MC distribution is lower in the outside parts and higher in the center part mat (10%-15%-10% and 15%-20%-15%), the temperature of core layer was raising faster than that of face layer and the moisture of core layer was also moving faster. (3) For the case of the initial MC distributed is evenly (13% and 17%), the temperature raised higher and moisture moved faster both at the core layer in the side or center parts, and it is good for particleboard manufacturing. 3. Based on the same density and initial MC of particle-mat , the efficiency of heating at the higher RC level can be made for making the moisture moving faster but not for rising the temperature in the primer stage of HF heating. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。