some silicon oil h. Stick the front seal ring with the front board, put the adjustment screw on the back seal ring and install it on the back board Make sure the positions by according Backspace to the drawing of the screen changer and then install the position guiding screw. and install the filter board lightly. Attention: tighten or release the adjustment screw to make sure the clearance of the front and back seal ring will be o.3mm bigger than the filter board. The upper and lower side boards will be contact the Enter upper and lower bottom of the filter board lightly, that is to say, the filter board will be in the middle of the front, back seal ring and side board seal ring, it can be pulled right or left by hand with some friction feeling. The parallelism degree of the front and the back seal ring must be 0.02-0.03mm. After installation of the whole screen changer, tighten up all screws. Before installation of filter board, front seal ring, back seal ring and side seal ring, it is necessary to spread a little bit rTIEL silicon oil. Install the heating bars inside the front board, the back board and the filter board correctly and fix the heating bars. After these processes install the screen changer onto the extruder. When the temperature reaches to the needed degree, check again if the rightleft running of the filter board is okay or not. Make sure when in the working temperature, the thickness of the filter board must be 0.06mm bigger than the front seal ring and the back seal ring t can be adjusted through screw turning If the distance is too big, the filter board can not be moved; and if the distance is too small, there will be material leakage.