Direct changing thickness of individual layers during production Easy operation, production costs reduction. Multi-layer space design according to product requirements. Interchangeable selector as required by customer to adapt to different products and changing layers required by the customer. Precision internal manifold design along with special surface treatment. Corrosion, heat, and wear resistant design. Adaptive to features and strength of rheology of melted polymers. Applicable with multi-layer composite production requirements of different materials.