Below are ways through which you can remove and prevent flow lines;u003cbr/u003ea. Increase the injection speed, pressure, or temperature of the material.u003cbr/u003eb. Where wall thickness increases, round the corners of the mold in those regions.u003cbr/u003ec. Give a good distance between mold gates and mold coolant.u003cbr/u003ed. Increase flow speed by increasing nozzle diameter.