The Japan Steel Works, Ltd.

Borealis Technology Oy

Takayuki Yamazawa

Jun Suzuki

Tingbi Xiong

Carl-Gustaf Ek

Makoto Ishikawa

Shigeki Inoue

Seiji Takamoto

Jari Aarila

Junichi Iwai

Kazuhiro Kodate

Takuya Hamada

Manabu Ikeya

Yutaka Mizutani

Arne Syre

Computer screen with graphical user interface

A multi-shaft kneading machine includes a channel and two screws rotatable around first axes of rotation. A pair of gate rods sandwich the two screws and are rotatable around second axes of rotation. Each of the pair of gate rods has two recess parts that form respective spaces through which the two screws penetrate. Each of the pair of gate rods has a first contact surface, which comes into surface contact with a screw when a gate rod is rotated to a minimum degree-of-opening position. Large diameter parts are fitted into the groove of the cylinder, and a small diameter part have a radius of curvature equal to half a distance between two second axes of rotation and smaller than a radius of curvature of the large diameter parts. The small diameter parts of the pair of gate rods are in contact with each other.

Multi-shaft kneading machine

A screw extruder having a body forming a chamber of two barrels housing two counter-rotating axis-parallel rotors, a supply port for the material to be mixed in the chamber at one end of the body, a discharge port for discharging the mixed material at the other end of the body, a conveying section with screws for feeding the material from the supply port downstream to a mixing section which comprises at least two mixing zones, each mixing zone having at least one forward-conveying wing and at least one backward-conveying wing downstream of the forward-conveying wing on each rotor characterized in that a throttle valve is provided in the chamber downstream of the mixing section, and downstream of the throttle valve a second conveying section with screws and a second mixing section are provided.

Counter-rotating twin screw extruder

Growing community of inventors

Hiroshima, Japan

Takayuki Yamazawa