Title:
【発明の名称】タンデム押出機の押出量制御方法
Document Type and Number:
Japanese Patent JP2813475
Kind Code:
B2
Abstract:
PURPOSE:To improve the product quality by setting a new set value which is the sum of the set pressure value and the pressure corrected value based on the difference between the thickness of resin discharged out of a die and the set thickness and controlling the number of screw rotations of a first stage extruder based on the difference between the set value and the actual pressure value. CONSTITUTION:Resin in the molten state in a first stage extruder 1 is fed into a second stage extruder 2 through a connecting tube of a tandem extruder, and discharged as a product 8 from the extruder 2 through a filter 7 and a die 9. In that case, the number of screw rotations of the second stage extruder 2 is controlled constant, while the number of screw rotations of the first extruder 1 is controlled by a controller 18. That is, the pressure corrected value Ph is found by a second controller 22 from the difference between the output value T of a thickness sensing controller 11 and the set thickness value Ts of the product 8 set by a setting device 13, and the pressure set value Ps set by a setting device 16 is added thereon to set a new set value Ps*. A motor 19 is controlled according to the difference between the set value Ps* and the actual pressure value P found by a pressure sensor 15.
Inventors:
Yukihiro Ishiguro
Application Number:
JP914191A
Publication Date:
October 22, 1998
Filing Date:
January 29, 1991
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
B29C48/385; B29C48/38; B29C48/92; G05B11/32; (IPC1-7): B29C47/92; B29C47/50
Domestic Patent References:
| JP595044A | ||||
| JP2160528A | ||||
| JP323922A | ||||
| JP31922A | ||||
| JP61266222A | ||||
| JP59199230A | ||||
| JP4125123A | ||||
| JP427518A | ||||
| JP3118134A |
Attorney, Agent or Firm:
Shigemitsu Tanaka