JPS59228097A - Paper thickness profile control apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows the nozzle air volume to be adjusted from a computer when paper runs out! The present invention relates to a profile control device that stabilizes the paper thickness profile pattern after paper passing in a short time by controlling the paper thickness.

There are dozens of cold air nozzles in the calendar pars 1 to 5 of the paper machine.
They are installed side by side at a pitch of 0 to 75 mm.

By controlling the amount of cold air blown out from each nozzle, the nip pressure of the calender rolls can be changed, thereby making it possible to change the paper thickness. Therefore, in order to obtain the desired paper thickness profile pattern, nozzle I! 1ffi is being adjusted. However, in the past, the reality was that this work was performed manually based on the experience and sense of the operator.

However, once a paper break occurs, the thermal balance between the paper on the calendar, the calendar roll, and the cold air is disrupted, and the paper thickness may not return to the profile pattern before the paper break even after the paper is passed through, or the profile pattern may not stabilize. There was a problem that it took a long time.

The present invention has been made in view of these points, and
The nozzle opening pattern for each brand is registered in advance, and if paper runs out and IC occurs, automatic operation is performed so that the pattern corresponds to that brand, and the paper thickness profile pattern after paper feeding is stabilized in a short time. This is a paper thickness profile control device that can be used.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a groove diagram showing one embodiment of the present invention.

In the figure, 1 is a dryer that removes moisture to a predetermined moisture content, 2 is a calender that forms paper to a constant pressure, 3 is an air nozzle attached to the calender, 4 is paper, and 5 is B that measures paper thickness. /M if, 6 is a paper take-up reel. The air nozzle 3 is installed in the paper width direction as shown in FIG. In the figure, A+"An indicates a nozzle. 7-" is a control panel that gives an ON-OFF signal to each nozzle, 8 is an arithmetic and control unit, and 9 is a data processing unit that is connected to the arithmetic and control unit and performs various data processing. The device 1o is an operator's panel for setting various control constants. B/M
A total of five outputs are connected to an arithmetic and control unit 8.

For example, a microcomputer is used as the arithmetic and control device. The operation of the device configured as described above will be explained as follows.

° A B/M meter (caliper meter) installed between the calendar 2 and the reel 6 is operated over the entire width of the paper 4 to measure the paper thickness profile in the paper width direction. A control algorithm in the arithmetic and control unit 8 calculates an operation output that causes this paper thickness profile to match a desired profile pattern, and outputs an operation signal for each nozzle. As a control algorithm,
For example, a non-interfering control algorithm is used.

The nozzle operation when paper runs out is as follows. In order to stabilize the paper thickness profile pattern after paper feeding in a short time,
When the paper runs out, the cold air nozzle is operated by, for example, a computer using the algorithm shown below.

(1) The cold air nozzle Ur1 degree pattern when paper runs out is registered in the computer in advance for each brand (for example, four brands).

(2) When paper runs out, the computer automatically operates the cold air nozzle to create a pattern that matches the brand.

(3) Even if the paper passes, the cold air nozzle opening in (2) is held until a paper thickness profile control command is input.

FIG. 2 is a timing chart that does not show the control mode when paper runs out. (a) shows the control state, and (b) shows the nozzle pattern. Paper runs out at time T1, paper passes at time T2, and a control command is input at time T3, causing the caliper control to be in automatic control mode.

Profile control when paper runs out is performed between T1 and T2 using a nozzle opening degree pattern registered in advance.

As described in detail above, according to the present invention, it is possible to realize a filter paper thickness profile control device that can stabilize the paper thickness profile pattern of the paper feed in a short time by operating the cold air nozzle when the paper runs out. Therefore, it is possible to avoid reducing m of waste paper.

[Brief explanation of drawings]

FIG. 1 is a groove diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the mounting position of the nozzle, and FIG. 3 is a timing chart without showing the control mode when paper runs out. 1...Dry A7, 2...Calendar, 3...Air nozzle. 4...Paper, 5...B/M3t, 6...Reel, 7
···control panel. 8... Arithmetic control device, 9... Data processing device, 1o
...A Perator's Panel. Rei η (0) Z1st J1st

Claims (1)

[Claims] In a device that blows air from an air nozzle on the paper sent from the dry A7 part in the calendar part to obtain a certain amount of paper thickness, if paper breaks occur, the nozzle opening degree registered in advance for each brand Using the pattern, the nozzle opening degree is automatically operated to match the pattern corresponding to the brand, and even if paper is passed, the nozzle opening degree pattern is kept in bold until a paper thickness control command is received. The paper thickness profile control device is characterized by: