JPS6048306A - Method of controlling size and form of gypsum board - 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 relates to a method for controlling the flatness and thickness of gypsum board with high precision, by improving the roll type board forming method and combining it with the plate type forming method. This improves the uniformity of the thickness.

In the conventional roll-forming method, the distance between the upper and lower rolls is set according to the thickness of the board to be manufactured, and the slurry-like gypsum board raw material, which has not yet solidified, is passed between the upper and lower rolls via a paper and a paper. , forming green boards. In this case, the flatness of the board is determined by the tangent line between the roll and the board, and the spacing between the rolls is unavoidable due to the n1 degree influence of the bearings of the upper and lower rotating rolls. The uniformity of thickness and thickness is not sufficient. A further problem is that the slurry volume and softness changes before entering the rolls directly affect the thickness of the board.

On the other hand, in the conventional plate forming method, the upper and lower route intervals are fixedly set according to the thickness of the board to be manufactured.
A green board is formed by inserting the gypsum board between the upper and lower grate via the top paper and bottom paper which have not yet hardened.

In this case, since the slate is stationary and fixed, the board forming process is carried out on the plane of the two constrained plates, which is superior to the roll forming method in terms of both flatness and thickness uniformity. be. However, the problem remains that slurry volume and softness changes before entering the freight directly affect board thickness. Furthermore, if solids are mixed into the slurry-like board material and the size of the solids is larger than the plate spacing, the top and bottom sheets will break, resulting in loss of board and eventually a line stoppage. There is a possibility that this may develop into a problem.

The invention was made in view of the above-mentioned problems of the prior art, and by skillfully combining the roll-forming method and the grate-forming method, a gypsum board with good flatness, uniform thickness, and almost no loss board was created. The purpose is to provide a method for controlling the size and shape of.

The structure of the first uninvented gypsum board size and shape control method that achieves this purpose is to interpose slurry-like gypsum board raw material between the upper paper and the first paper, and mold them into a pair of upper and lower sheets. After passing it through a roll to form a green board of a predetermined thickness, this clean board is passed between a pair of upper and lower forming plates installed behind the forming roll, while
The softness of the raw material slurry in front of the forming rolls is detected, and the interval between the forming rolls is adjusted in accordance with the softness of the raw material slurry so that a constant amount of slurry is always fed between the forming grates. Features. In addition, the configuration of the second uninvented gypsum board size and shape control method is as shown in the above paper and 1.
A slurry-like gypsum board raw material is interposed between the paper and the green board, which is passed through a pair of upper and lower forming rolls to form a green board of a predetermined thickness. While passing between the forming plates, the amount of dam in front of the forming rolls is detected, and the interval between the forming rolls is fully adjusted according to the amount of dam so that a constant amount of slurry is always fed between the upper and lower forming plates. It is characterized by

Embodiments of the present invention will be described in detail below with reference to the drawings.

No. 19 #'i It is a conceptual diagram showing a schematic configuration of an embodiment of the method for controlling the size and shape of a gypsum board according to the first invention,
FIG. 2 is a control circuit diagram thereof.

FIG. 3 is a conceptual diagram showing a schematic configuration of an embodiment of the gypsum board size and shape control method according to the second invention;
The figure shows the control circuit diagram.

First, the embodiment shown in FIGS. 1 and 2 will be described. In these figures, slurry-like gypsum board raw material 1 is fed between a pair of upper and lower forming rolls 5 and 6 together with the upper and lower sheets while being interposed between the upper and lower sheets 7 and 8, and is formed into a predetermined thickness. Green board 2 aF bottom molding. A pair of upper and lower forming plates 3 and 4 are arranged at a fixed interval behind the rolls, and the green board 2a that has come out of the rolls is fed thereto to maintain a constant flatness.

A forming belt conveyor 16 is arranged at the rear of the forming route, and the green board 2b flattened by the forming plate is hardened here to become a gypsum board 2c. In addition, in an emergency, the forming roll and forming plate are raised simultaneously and instantaneously.

As mentioned above, the forming plate 3 is placed after the forming roll 5.6.
．． 4, even if solids are mixed into the slurry, they will be crushed and compressed by the rotating rolls, so approximately 90% of the paper scraps will be eliminated by grate forming due to the solids mixed therein.

Further, the flatness of the board can be sufficiently high due to the molded plate.

By the way, as mentioned above, in either the roll type or the flat type, the influence of the board thickness due to changes in the softness of the slurry cannot be avoided.

Therefore, as shown in FIGS. 1 and 2, in the first invention, a softness detector 9 for detecting the softness of the raw material slurry 1 is installed in front of the forming roll 5.6, and changes in the slurry softness are The roll spacing is adjusted accordingly. That is, as shown in FIG. 2, the deviation between the detection signal 12 of the slurry softness detector 9 and the feedback signal 13 from the position sensor 11 provided in each forming row (V5, 6) is detected and adjusted by the total controller lO. By controlling the drive of the roll elevation control motor M using the operation signal 14 from the total 10, the roll interval 'a' is adjusted and the amount of slurry inserted between the forming grates 3 and 4 is controlled to be constant. Note that reference numeral 15 in FIG. 2 indicates control 'IjA' of motor M.

When the roll interval is constant, if the slurry softness is large, the amount of slurry inserted between the forming plates 3 and 4 will be large, so the thickness of the formed gypsum board will be large υ, and Slurry leaks from both sides of the green board. Conversely, if the slurry softness is small, the amount of slurry inserted between the forming plates 3 and 4 will be small, so the thickness of the formed gypsum board will be small, and the effect of plate forming will be small. flatness decreases.

Therefore, in FIG. 2, when the slurry softness is medium, the roll spacing is made small, and conversely, when the slurry softness is low, the roll spacing is made large. As a result, forming plate 3.
In No. 4, the forming is performed under control so that a constant amount of slurry is inserted between the plates even if the slurry softness changes, so the thickness of the gypsum board is extremely uniform and the flatness is large. improves. The device 9 for detecting slurry softness may be a vibrating viscometer, an ultrasonic viscometer, a device that measures the power to the mixer that makes the slurry, or a device that measures the suppressing load of the upper and lower forming rolls. , various instruments can be used.

Next, the second invention shown in FIGS. 3 and 4 will be described in detail. In these figures, the dam amount detector 17 is used in place of the slurry softness detector and is the same as in FIGS. 1 and 2, so redundant explanation will be omitted.

The dam amount detector 17 is installed in front of the forming rolls 5 and 6, and detects the dam sound of the raw material slurry 1 before entering the rolls. When the roll spacing is constant, if the amount of dam in front of the roll is large, the amount of slurry that passes through the forming roll 5°6f and is inserted into the forming grate 3.4 will increase, so the thickness of the formed gypsum board will increase. If the slurry is thicker than the target value, the slurry may leak from both sides of the green board. Conversely, if the dam amount is small, the amount of slurry inserted into the forming plates 3 and 4 through the forming rolls 5° 6 will be small.
The thickness of the formed gypsum board becomes thinner than the target value,
Furthermore, the forming effect of the plate is reduced and the flatness of the gypsum board is reduced.

Therefore, a dam amount detector 17 is installed in front of the forming rolls 5 and 6, and the roll interval is adjusted according to the dam amount so that the slurry t inserted into the forming plate 3.4 is kept as constant as possible.

That is, as shown in FIG. 4, the deviation between the detection signal 12 of the dam amount detector 17 and the feedback signal 13 from the position sensor 11 provided on each forming roll 5.6 is detected by the controller lO, By controlling the motor Mt with an operation signal 14 from 10, the roll interval is adjusted and the amount of slurry inserted between the forming plates 3 and 4 is controlled to be constant. When adjusting the roll spacing, if the dam amount is large, the spacing will be narrowed, and if the dam amount is small, the spacing will be widened. As a result, even if the dam amount changes, forming is performed while being controlled so that a constant amount of slurry is inserted between the forming plates 3 and 4, making the gypsum board extremely uniform in thickness and flat. degree is significantly improved.

By the way, as the dam amount detector] 7, various instruments such as an ultrasonic level meter, a capacitance type level meter, or an infrared level meter can be used. However, considering that it is inconvenient to install a capacitive level meter because it cannot maintain a sufficient distance between it and the slurry raw material, and that an infrared level meter may malfunction due to slurry raw material adhering to it, it is necessary to As the detector 17, it is preferable to use an ultrasonic level detector. In this case, the specifications are as follows: Measurement range: 0 to 200 meters Measurement accuracy: ±5% 611] Constant area = 50 to 200 meters is desirable.

As explained above, according to the gypsum board size and shape control method of the present invention, firstly, roll forming and plate forming are combined and roll forming is performed before plate forming, so that solids are not contained in the slurry. Even if they are mixed in, the top paper and bottom paper are almost never cut, thereby reducing the occurrence of loss boards and improving the number of steps. Second, the flatness of the gypsum board is originally good because it is obtained by the forming plate, but the softness and dam amount of the slurry raw material before the forming roll is detected and a certain amount of the slurry raw material is inserted into the forming plate. Since the roll spacing is adjusted in this manner, stone/K boards with extremely uniform thickness and high flatness can be manufactured without being affected by changes in softness or dam amount. .

Note that the adjustment of the roll spacing based on the softness and the adjustment of the roll spacing based on the dam amount are not only performed independently as in the example, but also can be used in combination. In this case, the adjustment of the roll spacing based on the softness and the dam amount Even if changes occur in both, these effects can be removed.

[Brief explanation of drawings]

1 and 2 relate to an embodiment of the first invention,
FIG. 1 is a conceptual diagram of a schematic configuration, and FIG. 2 is a control circuit diagram. 3 and 4 relate to an embodiment of the second invention, FIG. 3 is a conceptual diagram of a schematic configuration, and the fourth figure is a control circuit diagram. In the drawing, 1 is slurry-like plasterboard raw material, 2a and 2b are green boards, 2C is gypsum board, 3 and 4 are molded plates,
5 and 6 are forming rolls, 7 and 8 are paper, 9 is a softness detector, 1
0 is a controller, 11 is a position sensor, 12 is a detection signal, 13
is a feedback signal, 14 is an operation signal, 15 is a control amount, 16 is a forming belt conveyor, 17 is a dam amount detector, M
is the motor. Patent applicant Onoda Cement Co., Ltd. Agent Patent attorney Shibu Mitsuishi (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A slurry-like gypsum board raw material is interposed between the top paper and the bottom paper, and after passing these through a pair of upper and lower forming rolls to form a green board of a predetermined thickness, this clean board is placed behind the forming rolls. While passing between a pair of upper and lower forming plates installed at A method for controlling the size and shape of a gypsum board, characterized in that the interval between the forming rolls is adjusted depending on the degree of the forming roll. (2) A slurry-like gypsum board raw material is interposed between the upper paper and the lower paper, and after passing these through a pair of upper and lower forming rolls to form a green board of a predetermined thickness, this green board is placed behind the forming rolls. While passing between a pair of upper and lower forming plates installed at A method for controlling the size and shape of gypsum board, characterized by adjusting the interval between rolls.