A sieve guide assembly comprising a circular sieve screen and a sieve guide mountable in a fractionating device for fractionating granules for tableting; wherein the fractionating device comprises a tubular rim portion for receiving the sieve guide assembly, wherein the rim portion comprises an outlet, wherein the sieve guide is fixedly attached to the sieve screen, wherein the sieve guide comprises: - a circular guide portion (310.1) adapted to guide a central guided orbital flow, wherein the central guided orbital flow defines an orbital downstream direction, wherein the circular portion (310.1) is positioned centrally on the sieve screen and thereby defining a central loading area of the sieve screen for granules to be fractionated, and wherein the circular guide portion (310.1) comprises a first radial opening (310.5) extending in an upstream orbital direction from a first to a second side, wherein the upstream orbital direction is opposite the downstream orbital direction, - a lateral guide portion adapted to guide a lateral guided flow of granules from the central loading area, wherein the lateral guide portion comprises a first lateral guide member (310.2) extending in the lateral direction from the first side of the first radial opening (310.5) and to a periphery (190.1) of the sieve screen, wherein the outlet of a fractionating device comprises an opening in the tubular rim portion, and wherein the opening of the outlet is extending in the upstream orbital direction from a first to a second side; and wherein the sieve guide assembly is adapted to be mounted in a fractionating device in a specific angular position with the first lateral guide member (310.2) aligned with the first side of the outlet of a fractionating device; and whereby the lateral guided flow of granules can be guided along the first lateral guide member to the outlet, when the sieve guide assembly is mounted in the specific angular position in a fractionating device, and when the fractionating device induces an orbital and a lateral flow. wherein the fractionating device comprises a tubular rim portion for receiving the sieve guide assembly, wherein the rim portion comprises an outlet, wherein the sieve guide is fixedly attached to the sieve screen, wherein the sieve guide comprises: - a circular guide portion (310.1) adapted to guide a central guided orbital flow, wherein the central guided orbital flow defines an orbital downstream direction, wherein the circular portion (310.1) is positioned centrally on the sieve screen and thereby defining a central loading area of the sieve screen for granules to be fractionated, and wherein the circular guide portion (310.1) comprises a first radial opening (310.5) extending in an upstream orbital direction from a first to a second side, wherein the upstream orbital direction is opposite the downstream orbital direction, - a lateral guide portion adapted to guide a lateral guided flow of granules from the central loading area, wherein the lateral guide portion comprises a first lateral guide member (310.2) extending in the lateral direction from the first side of the first radial opening (310.5) and to a periphery (190.1) of the sieve screen, - a circular guide portion (310.1) adapted to guide a central guided orbital flow, wherein the central guided orbital flow defines an orbital downstream direction, wherein the circular portion (310.1) is positioned centrally on the sieve screen and thereby defining a central loading area of the sieve screen for granules to be fractionated, and wherein the circular guide portion (310.1) comprises a first radial opening (310.5) extending in an upstream orbital direction from a first to a second side, wherein the upstream orbital direction is opposite the downstream orbital direction, - a lateral guide portion adapted to guide a lateral guided flow of granules from the central loading area, wherein the lateral guide portion comprises a first lateral guide member (310.2) extending in the lateral direction from the first side of the first radial opening (310.5) and to a periphery (190.1) of the sieve screen, wherein the outlet of a fractionating device comprises an opening in the tubular rim portion, and wherein the opening of the outlet is extending in the upstream orbital direction from a first to a second side; and wherein the sieve guide assembly is adapted to be mounted in a fractionating device in a specific angular position with the first lateral guide member (310.2) aligned with the first side of the outlet of a fractionating device; and whereby the lateral guided flow of granules can be guided along the first lateral guide member to the outlet, when the sieve guide assembly is mounted in the specific angular position in a fractionating device, and when the fractionating device induces an orbital and a lateral flow.