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通常对针叶树树脂粘度的测定是采用 Mc-Reynolds 及 Lane 于1971年所介绍的浮泡法,或1975年 Hanover 所用的落球法。这两种方法的主要缺点是在粘度测定尚未完成之前即常有结晶出现,因此使用这两种方法时要采取一些控制温度的措施如恒温水浴。这往往需要将试样由野外运送至实验室,而在此期间常常出现结晶,这一问题对松脂迅速结晶的火炬松(P.teada L.)及短叶松(P.echinata mill.)尤为突出。本文介绍一种花钱不多的野外测定树脂粘度和密度的技术,在样品采集后可立即测定。
The coniferous resin viscosity is usually measured by the bubbling method introduced by Mc-Reynolds and Lane in 1971, or the ball-dropping method used by Hanover in 1975. The main disadvantage of these two methods is that frequent crystallization occurs before the determination of the viscosity has been completed. Therefore, when using these two methods, some temperature control measures such as a constant temperature water bath should be taken. This often entails transporting the sample from the field to the laboratory during which crystallization often occurs, a problem that is especially noticeable with the rapidly growing turpentine (P. teada L.) and P. echinata mill prominent. This article describes a technique for inexpensive and field-sensitive resin viscosity and density measurements that can be determined immediately after sample collection.