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树脂用量冷树脂法所用的树脂比较价昂,因此要求尽可能降低其用量,几年前树脂用量还是2～3％,而目前一般已降为1％,所以有如此大幅度的下降其原因主要有二: 1.树脂粘结力由于不断的研究而得到很大提高, 2.原先那种一味追求高的型砂强度的概念已被逐渐摈弃,目前人们已习惯于要求低一些但够用的强度。这种概念上的改变,不单纯是出自经济上的考虑。粘结剂用量低以及由此而导致的低型砂强度,会减轻落砂的工作量。由于经济和环境保护方面的理由而不得不搞旧砂再生,也将得以简化。树脂用量低,使得砂子周转过程中的树脂烧失量比以往的低。据目前了解,典型的烧失量为2～5％,在那些烧失量明显超过此数的地方,要想降低它,只要添置某些简单的
The amount of resin used in cold resin resin is relatively expensive, requiring the use of as much as possible to reduce the amount of resin a few years ago, or 2 to 3%, while the general has been reduced to 1%, so there is such a substantial decline in the main reason There are two: 1 resin adhesion due to continuous research has been greatly improved, 2. The original blind pursuit of the concept of high sand strength has been gradually abandoned, the current people have been accustomed to lower but enough intensity . This conceptual change, not simply from economic considerations. Low binder levels and the resulting low sand strength reduce the amount of work required to remove sand. The regeneration of old sand, which has to be done for economic and environmental reasons, will also be simplified. Resin dosage is low, making the loss of resin loss in the process of sand turnover lower than ever. As far as I know, the typical loss on ignition is 2 ~ 5%, in those places where the loss on ignition obviously exceeds this number, in order to reduce it, just add some simple