To eliminate two shortcomings of normal pin mixing sections, namely, the lack of efficient mixing mechanisms and the formation of dead spots, a new type of pin (pins channeled from top-front to bottom-rear) was previously proposed. As an experimental verification of the effectiveness of this type of pin, a dye decoloration experiment with a visual single screw extruder was carried out. The comparative experiments show that a "parallel to" type pin mixing section (the orientation of holes in the pins is parallel) has the best mixing ability; a 45 degrees angle between the projected line of orientation of holes in the pins and the screw axial line provides maximum mixing; however, a 45 degrees angle between the orientation of the pin array and the screw axial direction results in poor mixing. The effect of density of the pins along the screw circumferential and axial direction on distribution mixing was also investigated experimentally.