目前采割松脂的方法有上升法和下降法,但各有优缺点。上升法优点是:采割时间增长,松脂产量保持不降。缺点是:松脂容易流满割面,松节油较易挥发,松脂损失较大,松脂质量较差。而下降法优点是:松脂汇集中沟,松节油、松脂损失较少,松脂质量较好。缺点是:随着采割时间增长,产脂量逐渐降低。我国以前推广的是下降法,所以目前大多是用下降法采脂。据国营红旗松香厂二十年国营采脂的实践,从中沟顶点约 The current method of cutting turpentine rise and fall law, but each has its own advantages and disadvantages. Advantages of the ascent method are as follows: When the cutting time is increased, the yield of rosin remains unchanged. Disadvantages are: turpentine easily overcrowding, turpentine more volatile, greater loss of turpentine, turpentine quality is poor. The descent method has the advantages of: turpentine pool groove, turpentine, turpentine less loss, better quality turpentine. The disadvantage is: as the cutting time increases, fat production gradually decreased. Before the promotion of our country is the law of decline, so most of the time is to use the method of declining fat. According to the state-owned red flag rosin plant twenty years of state-owned practice of plastic, about the culmination from the ditch