Title:
非並列で収れんするコニカルスクリューを用いた2軸スクリュー式押出機
Document Type and Number:
Japanese Patent JP3925726
Kind Code:
B2
Abstract:
An improved twin screw extruder device (14) is provided which is capable of producing a wide variety of high quality extrudates having greatly varying final properties, without the need for extensive machine modifications. The extruder (14) includes a barrel (16) together with a co-rotating twin screw assembly (22). The assembly (22) is made up of a pair of screws (50, 52) having central, tapered shafts (54, 56) equipped with outwardly extending helical flighting (58, 60); the screws (50, 52) are non-parallel and are positioned so that the flighting (58, 60) thereof is intercalated along the length of the screws (50, 52). The flighting is of specialized configuration and tapers along the length of the screws (50, 52) preferably at an angle of taper different than that of the shafts (54, 56); moreover, the width of the outer flighting surfaces (70, 72) increases along the length of the shafts (54, 56). This screw geometry defines a series of alternating upper and lower close-clearance high-pressure nip areas (78) defined by the flighting (58, 60) which serves to propel an extrudable mixture forwardly towards the outlet end (20) of the barrel (16). However, passageways (80) and kneading zones (82) are also defined between the screws (50, 52), which assures full mixing, shearing and cooking of the material. The extruder device (14) is capable of producing high density sinking aquatic feeds as well as expanded, low density products merely by changing the rotational speed of the screws (50, 52) together with appropriate temperature control. In another embodiment, a fluid extraction extruder (138) is provided having a specialized extruder head (140) including an outer shell (144) and an inner, elongated, slotted sleeve (152).
Inventors:
Hark Bobby W.
Wenger Ray Bondy.
Wenger Ray Bondy.
Application Number:
JP2003515361A
Publication Date:
June 06, 2007
Filing Date:
May 31, 2002
Export Citation:
Assignee:
Wenger Manufacturing INC.
International Classes:
A23N17/00; A23L5/10; A23L7/10; A23P1/12; B29C48/525
Domestic Patent References:
| JP62503083A |
Foreign References:
| US4247206 | ||||
| US5783240 | ||||
| US4875847 |
Attorney, Agent or Firm:
Nozomi Watanabe
Haruko Sanwa
Haruko Sanwa