A cigarette filter inspection method of inspecting a solid flavor element to be disposed in a void between two filter plugs placed in outer filter wrapper, and the cigarette filter inspection method includes an illumination step of irradiating the void with illumination light, an imaging step of obtaining an inspection image of a region containing the void, a filler detection step of detecting the flavor element based on contrast between the void and the flavor element in the inspection image, and an inspection step of inspecting the flavor element detected in the inspection image.

A cigarette filter inspection method of inspecting a solid flavor element to be disposed in a void between two filter plugs placed in outer filter wrapper, and the cigarette filter inspection method includes an illumination step of irradiating the void with illumination light, an imaging step of obtaining an inspection image of a region containing the void, a filler detection step of detecting the flavor element based on contrast between the void and the flavor element in the inspection image, and an inspection step of inspecting the flavor element detected in the inspection image.

A method for adding ingredients to a mass of curd, comprises a step of separating whey from curd grains, a step of transferring curd grains from the separating step to a step of arranging the curd grains in a mould. A step of adding the ingredients is performed in the transferring step.

A separator for separating a liquid from a solid is provided. The separator comprises a housing with a longitudinal central axis, the housing having a top and a bottom. The housing further comprises an inlet for a mixture of the liquid and solid at the top of the housing, a solid outlet arranged at the bottom of the housing, and a liquid outlet arranged at the bottom of the housing. A conical screen plate is arranged within the housing, the conical screen plate dividing the interior of the housing into a solid collecting chamber and a liquid collecting chamber, the inlet running into the solid collecting chamber and the solid outlet running out from the solid collecting chamber, and the liquid outlet running out from the liquid collecting chamber. The conical screen plate is suspended in the housing, such that the conical screen plate is rotatable around a longitudinal axis.