Titanium alloy material has low thermal conductivity and smooth inner wall to reduce friction. It also has good comprehensive mechanical properties, high strength and low thermal conductivity. The product is made of titanium alloy, which has higher strength and more wear resistance compared with ordinary throat tubes. The product's inner wall is smooth and burr free after special process treatment. Compared with ordinary throat tubes, the resistance of printing and pumping back is reduced, and the precision of printed finished products is higher and more delicate.