JPH0651309B2 - Roll gap control device in calendar equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a roll gap control device in a calendar facility in which relative flow balance of materials between roll gaps is not disturbed.

[Prior Art] When a resin sheet is manufactured by a calendar facility, it is necessary to control the roll gap between the calendar rolls in order to prevent the sheet thickness from being disturbed and air from being mixed into the sheet.

The conventional means for controlling the roll gap will be described with reference to FIG. 2. In the figure, 1,2,3,4 are calendar rolls, 5 is a conveyor for supplying the resin mixed on the calendar rolls 1,2, and 6 is a take-off roll. , 7 are electric motor 8 and screw shaft 9
A roll gap adjusting device for adjusting the roll gap between the calendar rolls 3 and 4 by rotating the screw shaft 9 by driving the electric motor 8, and 10 is a thickness for detecting the thickness of the manufactured sheet 11. Detector, 12 is thickness detector 10
When the thickness of the sheet 11 detected in step 1 is different from the thickness set in advance by the setter 13, an arithmetic and control unit for determining the roll gap adjustment amount from the deviation and giving a command signal to the electric motor 8, 14 is the electric motor 8 Calculating and detecting the number of rotations 12
Position detectors such as a pulse generator that feeds back to 15, 15, 18 are banks. The roll gap adjusting device 7 is provided on both side shafts of the calendar roll 4.

Depending on the material supplied from the conveyor 5, the calendar roll 1,
A bank 15 is formed on the upper side of the calender rolls 2, a bank 17 is formed between the calender rolls 2 and 3, and a bank 18 is further formed between the calender rolls 3 and 4, and the material drawn from between the calender rolls 1 and 2 is calendered. The sheet 11 is manufactured by rolling between the rolls 2 and 3 and between the rolls 3 and 4. At this time, the thickness of the sheet 11 is detected by the thickness detector 10, and the thickness signal is sent to the arithmetic and control unit 12, and the arithmetic and control unit 12 detects the preset thickness by the setter 13. Deviation is obtained, and if there is a deviation, a command signal is given from the arithmetic and control unit 12 to the electric motor 8 of the roll gap adjusting unit 7 and the screw shaft 9 rotates to move the calendar roll 4 up and down. , The roll gap between the calendar rolls 3 and 4 is adjusted so that the bank 15 maintains a predetermined state.

[Problems to be Solved by the Invention] However, in the roll gap control means described above, only roll gap control between the calendar rolls 3 and 4 is performed,
Since the roll gap between the calendar rolls 1 and 2 and between the rolls 2 and 3 is not controlled, the material flow between the calender rolls 3 and 4 and the material flow between the calender rolls 1, 2 and 2 and 3 are unbalanced. Occurs, and the states of the banks 17 and 18 also fluctuate, resulting in an adverse effect on the product sheet.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the relative flow balance of the material between the roll gaps from being lost when the final stage roll gap is adjusted.

[Means for Solving the Problems] The present invention is for adjusting the roll gap between each calender roll in a calender facility having three or more calender rolls and having two or more roll gaps through which the material passes. A plurality of roll gap adjusting devices, a thickness detector for detecting the sheet thickness after exiting the roll gap of the final stage, and a sheet thickness detected by the thickness detector and a final set sheet thickness. A roll which determines the roll gap adjustment amount of the stage and gives the roll gap adjustment amount as a command signal to the final stage roll gap adjustment device, and the roll which is given from the roll gap adjustment amount to a roll gap adjustment device other than the final stage roll gap adjustment device. A roll other than the roll gap adjusting device at the final stage is used to obtain the roll gap adjustment amount. It is provided with a configuration in which a calculation control device for giving a command signal to the gap adjusting device is provided.

[Operation] The sheet thickness detected by the thickness detector is sent to the arithmetic and control unit, and the final stage roll gap adjustment amount is obtained from the sheet thickness set by the arithmetic and control unit and the detected sheet thickness. At the same time, the roll gap adjustment amount of the portion other than the final stage is obtained from the roll gap adjustment amount, and the obtained roll gap adjustment amount is sent to each roll gap adjusting device to control all the roll gaps. Therefore, the relative balance of the material flows between the roll gaps is maintained.

EXAMPLES Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which 19 and 22 are electric motors 20 and 23.
And the screw shafts 21 and 24 are driven to rotate the screw shafts 21 and 24 by driving the electric motors 20 and 23, and between the calendar rolls 1 and 2, 2, 3
Roll gap adjusting device for adjusting the roll gap between, 25,26 is a position detector such as a pulse generator that detects the number of rotations of the electric motor 20,23 and feeds back to the arithmetic control device 12, the arithmetic control device 12 From the electric motor 20,2
A command signal can also be given to 3. The calendar roll 3 is a fixed type that does not move in the vertical and horizontal directions, and the roll gap adjusting devices 19 and 22 are provided on both side shaft portions of the calendar rolls 1 and 2. The same reference numerals as those shown in FIG. 2 in FIG. 1 are given the same reference numerals.

When manufacturing the sheet 11, if there is a deviation between the detection value detected by the thickness detector 10 and the set value preset by the setter 13, the deviation is calculated as a command signal for the roll gap adjustment amount. It was given from the control device 12 to the electric motor 8 of the roll gap adjusting device 7, the screw shaft 9 was rotated, the roll gap between the calendar rolls 3 and 4 was adjusted, and it was calculated based on the roll gap adjusting amount. Electric motor 2 with roll gap adjustment device 19 and 22
0,23 is given as a command signal, the screw shafts 21,24 are rotated and the roll gap between the calendar rolls 1 and 2 and between the rolls 2 and 3 corresponds to the roll gap amount between the calendar rolls 3 and 4. Adjusted. Therefore, the roll gap between the calendar rolls 1, 2, 3, and 4 does not disturb the relative flow balance of the material in each roll gap and the banks 17 and 18 do not fluctuate, which adversely affects the product sheet. There is no such thing. Next, the roll gap adjustment amount will be described.

It is sent from between the calendar rolls 1 and 2, and between 2 and 3. The changes ΔQ ₁ and ΔQ ₂ in the material supply amount are And the change amount ΔQ ₃ of the material consumption sent out between the calendar rolls 3 and 4 is It is represented by.

Where SW ₁ is the coefficient determined by the swell between the calendar rolls 1 and 2 SW ₂ is the coefficient that is determined by the swell between the calendar rolls 2 and 3 SW ₃ is the coefficient that is determined by the swell between the calendar rolls 3 and 4 V _{1 is the} calendar roll 1 peripheral speed V ₂ ; calendar roll 2 peripheral speed V ₃ ; calendar roll 3 peripheral speed V ₄ ; calendar roll 4 peripheral speed B ₁ ; calender roll 1, 2 roll gap exit side sheet width B ₂ ; the sheet width of the roll gap exit side between the calender rolls 2,3 B _3; calendar sheet width of the roll gap exit side between the rolls 3, 4 K _M1; hardness of the material which passes between calender rolls 1 and 2 and the calender rolls 1,2 And coefficient of influence K _M2 determined by housing strain; hardness of material passing between calendar rolls 2 and 3 and coefficient of influence K determined by calendar rolls 2 and 3 and housing strain K _M3 : Influence coefficient determined by hardness of material passing between calender rolls 3 and 4 and calender rolls 3, 4 and housing strain ΔS ₁ ; Roll gap adjustment amount between calender rolls 1 and 2 ΔS ₂ ; Between calender rolls 2 and 3 Roll gap adjustment amount ΔS ₃ ; Roll gap adjustment amount between the calendar rolls 3 and 4, assuming that the material supply amount change amount = constant relationship is always established, ΔQ ₁ = ΔQ ₂ = ΔQ ₃ is established. Therefore
From equations (i) (ii) (iii), Is obtained.

Actual search of [Delta] S ₃ from the thickness obtained in the thickness detector 10 at the time of the roll gap control, [Delta] S _1, obtains the [Delta] S ₂ by the ΔS ₃ (iv) (v) _{expression, ΔS 1, ΔS 2, ΔS} 3 Only adjust the roll gap.

In the embodiment of the present invention, the case where the calender roll 4 is located below the calender roll 3 and the entire calender roll is arranged in the inverted L-shape has been described. Needless to say, the present invention can be carried out even if the entire roll is arranged in a Z shape, and that various changes can be made without departing from the scope of the present invention.

[Effect of the Invention] According to the roll gap control device in the calendar facility of the present invention, the relative flow balance of the material in each roll gap of the calendar roll is maintained, so that a good product sheet can be obtained. Can play.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. In the figure, 1,2,3,4 are calendar rolls, 7,19,22 are roll gap adjusting devices, 10 is a thickness detector, 11 is a sheet, and 12 is an arithmetic and control unit.

Claims (1)

[Claims] 1. A calender facility comprising three or more calender rolls and having two or more roll gaps through which a material passes, and a plurality of roll gap adjusting devices for adjusting the roll gaps between the calender rolls, and a final device. A thickness detector that detects the sheet thickness after exiting the roll gap of the step, and the sheet thickness detected by the thickness detector and the set sheet thickness are used to obtain the final step roll gap adjustment amount. The roll gap adjustment amount is given as a command signal to the final stage roll gap adjustment device, and the roll gap adjustment amount given to a roll gap adjustment device other than the final stage roll gap adjustment device is obtained from the roll gap adjustment amount. The roll gap adjustment amount is sent as a command signal to a roll gap adjustment device other than the final stage roll gap adjustment device. Providing the arithmetic and control unit providing Te roll gap control device of the calendar facility characterized by.