The shape of the knief-axis is eight character about one's bith. It has a large smashing force for hollow thin-walled plastic products. The installment model of the cutter blade is back to back. So it has a large cutting force. Sphere of application: It has a good crushing effort for various hollow thin-walled bottles,thin film,woven bags,nylon and other plastic products.Automatic feeding device and automatic delivery filling system can be additionally mouted, which make the production efficiency high.