The swell factor tends to decrease if the cross section of die crown is large, the die round R is small, the runner is large, the dumping temperature is high and the extrusion speed is low;
口型的冠部截面大、口型圆角R小、流胶口大，排胶温度高，挤出速度慢，则膨胀因数小；
2
Many factors are affecting results in short RACES, of which technical pressure in a runner's highspeed racing can greatly hinder the progress of a short race runner.