Abstract: An extruder has a pair of linkage parts configured to respectively link end portions of a pair of output shafts of the speed reducer with end portions of a pair of screws coaxially. The linkage parts each has: a coupling having an insertion hole into which the end portion of the screw and the end portion of the output shaft are inserted; and a locking part attached to the end portion of the output shaft. The coupling has a first receiving portion configured to receive the end portion of the output shaft; the second receiving portion configured to receive the locking part; and a step portion formed between the first receiving portion and the second receiving portion. As the step portion is locked by the locking part, a relative movement of the coupling relative to the output shaft in a direction towards the screw is restricted.

Abstract: A method of measuring the thicknesses of each layer coated on the both surfaces of the base material, which includes the steps of: measuring simultaneously a first distance between a first displacement meter and the surface of the layer coated on the one surface of the base material, a second distance between a second displacement meter and the surface of the layer coated on the other surface of the base material, and a third distance between a third displacement meter and the one surface of the base material; calculating a thickness (Ta) of the layer coated on the one surface of the base material by subtracting the value (Da) measured by the first displacement meter from the value (Dc) measured by the third displacement miter; calculating a whole thickness (T) of the coated sheet from the value (Da) measured by the first displacement meter and the value (Db) measured by the second displacement meter; and calculating a thickness (Tb) of the layer coated on the other surface of the base material by subtracting