我在一九七三年就开始研制折叠黑板,先后经过六年多的试验,取得了较好的效果。现将制作方法介绍如下: 为了减轻黑板重量,黑板改用纸张制作。通过数种纸的试用,觉得以变压器绝缘纸较好。各地也可根据本地情况选择,但要注意:(一)纸的纤维要密,不易破,耐磨;(二)纸表面要平,易于擦写。 I started to develop the folding blackboard in 1973. After more than six years of experiment, I achieved good results. Production methods are introduced as follows: In order to reduce the weight of the blackboard, blackboard paper to use instead. Through the trial of several kinds of paper, feel better with transformer insulation paper. All localities can also choose according to local conditions, but should pay attention to: (a) paper fiber dense, not easy to break, wear-resistant; (b) the paper surface should be flat, easy to erase.