A method for producing a water absorbent resin, the method including a polymerization step, a drying step, a classification step, and a surface crosslinking step. The classification step carried out before or after the surface crosslinking step requires use of a tapping material and a metal sieve mesh, in which the tapping material being heated at 40 C. to 100 C. is installed below the metal sieve mesh, and the metal sieve mesh has an area of 1 to 10 m.sup.2/sheet. The classification step further requires introducing a classification aid particle, which has a specific gravity different from that of the water absorbent resin, to the metal sieve mesh; and monitoring the presence or absence of damage to the metal sieve mesh.

A method for producing a water absorbent resin, the method including a polymerization step, a drying step, a classification step, and a surface crosslinking step. The classification step carried out before or after the surface crosslinking step requires use of a tapping material and a metal sieve mesh, in which the tapping material being heated at 40 C. to 100 C. is installed below the metal sieve mesh, and the metal sieve mesh has an area of 1 to 10 m.sup.2/sheet. The classification step further requires introducing a classification aid particle, which has a specific gravity different from that of the water absorbent resin, to the metal sieve mesh; and monitoring the presence or absence of damage to the metal sieve mesh.

A resin tapping member used for a method of separating and recovering that enables a polymer to be separated and recovered from a polymer-containing liquid during or after a polymerization reaction at a high quality, high efficiency, and high processing capacity. The resin tapping member for preventing clogging of a screen is used in separating and recovering a polymer obtained by a polymerization reaction in a solvent. The resin tapping member has a weight reduction percentage of 3 wt. % or less after continuous separating and recovering of a polymer from a polymer-containing liquid for 48 hours.

A resin tapping member used for a method of separating and recovering that enables a polymer to be separated and recovered from a polymer-containing liquid during or after a polymerization reaction at a high quality, high efficiency, and high processing capacity. The resin tapping member for preventing clogging of a screen is used in separating and recovering a polymer obtained by a polymerization reaction in a solvent. The resin tapping member has a weight reduction percentage of 3 wt. % or less after continuous separating and recovering of a polymer from a polymer-containing liquid for 48 hours.

The present invention discloses a staggered and inter-impinging self-cleaning screening device, comprising a plurality of staggered and inter-impinging rotating screening mechanisms arranged in a tilted downward conveying direction, movement generating mechanisms, and pulse warning automatic cleaning mechanisms; the staggered and inter-impinging rotating screening mechanisms are adjacently arranged or arranged every other shaft; the self-cleaning screen devices are equidistantly coupled and installed on the outer surface of the rotating shaft; the rotating shaft is constructed into a hollow structure, and provided with spray-holes; the self-cleaning screen devices of the rotating shaft are equidistantly staggered with each other in the coaxial direction; the pulse warning automatic cleaning mechanism comprises an overload detector, and a controller; the overload detector is installed at one end of the rotating shaft; the movement generating mechanism includes planar cams installed at both ends of the rotating shaft assembly.

Improved de-blinding rod assemblies for aggregate processing are provided. In one embodiment, uni-directional locking dowels are employed to create connections that resist backing out or loosening during vibration, enhancing assembly integrity. Another embodiment provides a unitary de-blinding rod formed as a single molded piece, which simplifies assembly, increases mass for improved screen clearing efficiency, and enhances operational safety. The rod terminates in a single-unit connecting bar assembly that reduces reliance on multiple dowels for securing branches and sleeves. The locking dowels exhibit an improved design preventing dislodgement during high-vibration conditions, thereby improving durability and reducing maintenance.

Improved de-blinding rod assemblies for aggregate processing are provided. In one embodiment, uni-directional locking dowels are employed to create connections that resist backing out or loosening during vibration, enhancing assembly integrity. Another embodiment provides a unitary de-blinding rod formed as a single molded piece, which simplifies assembly, increases mass for improved screen clearing efficiency, and enhances operational safety. The rod terminates in a single-unit connecting bar assembly that reduces reliance on multiple dowels for securing branches and sleeves. The locking dowels exhibit an improved design preventing dislodgement during high-vibration conditions, thereby improving durability and reducing maintenance.

The invention relates to a device for continuously sorting a particulate stream, comprising: a) a screw conveyor (1) for conveying the particulate stream to a separation device, b) a sieve (7) for separating the particulate stream ac cording to size, characterized in that it further comprises c) a pre-sieve (3) comprising elongated sieve openings formed by fingers extending towards an end portion of the pre-sieve with the tips of the fingers not being connected in that end portion, the pre-sieve (3) being located between the conveyor outlet and the sieve, d) wherein the pre-sieve (3) encloses part of the circumference of the conveyor screw in an axial end portion of the conveyor screw, and e) the radial distance between the conveyor screw (1) and the pre-sieve (3) is less than 10%, preferably less than 5% of the conveyor screw diameter. The pre-sieve allows to separate elongated objects like threads or wires from the particulate stream which would otherwise clog or block subsequent separation devices including the sieve.

The invention relates to a device for continuously sorting a particulate stream, comprising: a) a screw conveyor (1) for conveying the particulate stream to a separation device, b) a sieve (7) for separating the particulate stream ac cording to size, characterized in that it further comprises c) a pre-sieve (3) comprising elongated sieve openings formed by fingers extending towards an end portion of the pre-sieve with the tips of the fingers not being connected in that end portion, the pre-sieve (3) being located between the conveyor outlet and the sieve, d) wherein the pre-sieve (3) encloses part of the circumference of the conveyor screw in an axial end portion of the conveyor screw, and e) the radial distance between the conveyor screw (1) and the pre-sieve (3) is less than 10%, preferably less than 5% of the conveyor screw diameter. The pre-sieve allows to separate elongated objects like threads or wires from the particulate stream which would otherwise clog or block subsequent separation devices including the sieve.