压膜造型在国外是一项新的工艺。大跃进以来国内有不少地方大力推行这种新的造型方法,但是在设备上及造型工艺上尚存在一些问题;同时,亦有不少同志耽心用压膜造型法造出的砂型四角硬度是否符合要求,对复杂模型造型是否能压实;对较高的砂箱造型是否能均匀地压实;有箱挡的砂箱,在 Film molding in foreign countries is a new technology. Since the Great Leap Forward, there are quite a few places in our country that have vigorously promoted this new modeling method. However, there are still some problems on the equipment and on the styling process. At the same time, many comrades are also worried about the hardness of the sand-type formed by the film- Whether it meets the requirements of the complex model can be compacted; whether the shape of the higher flask can be uniformly compacted; box with a sand box, at