JPS6128576B2 - - Google Patents

Description

[Detailed Description of the Invention] It has been well known that controlling the winding hardness of the winding roll in a web winding machine (hereinafter referred to as a winder) is important for quality control. It is.

Here, one example of the most typical conventional winder will be explained with reference to FIG. It is also known that it is effective to control three elements of the nip pressure C formed at the contact portion of the nip.

In general, increasing the operating tension A, increasing the driving torque B of the second winder drum 3 relative to the first winder drum 2, and increasing the nip pressure C.
It has also been found that increasing the winding strength is very effective in increasing the winding stiffness.

Although not shown in the conventional winder shown in Fig. 1, there are tension setting devices, winder load level setting devices, and rider roll pressurization that can indirectly increase or decrease the nip pressure. Cylinder action pressure setting devices and the like are provided on the winder control desk, and the operator operates these setting devices to control the winding tightness and operate the winder. In FIG. 1, 4 is a rewind roll, 5 is a paper roll, 6 is a slitter, 7 is a rider roll, and 8 is a core.

However, winder operators have many other tasks to perform during operation, and it is therefore impossible to continuously operate the various setting devices for controlling winding stiffness. Even if the control deviated from the ideal state, it was acceptable as long as it was not a major defect. However, in recent years, with the diversification of paper types and the increase in the diameter of the winding roll, the rate of defective winding quality has been increasing, and there has been a strong demand for improvement of these problems in terms of equipment.

Therefore, various devices have been developed that automatically change the operating tension A, the ratio of the winder drum driving torque B, and the increase or decrease in the nip pressure C in relation to the increase in the winding diameter.

For example, as shown in Figure 2, changing the nip pressure as the take-up roll diameter increases has already been developed using an electric method using a microcomputer or an air control method combining a pneumatic calculator. .

However, the conventional winder shown in FIG. 1 has the following drawbacks. In other words, the operator is not provided with valid judgment data regarding how to set the change curve of the nip pressure C. Although the control curve is set using the data obtained from the roll, it is not appropriate to judge the structural characteristics inside the take-up roll based only on the data obtained from the roll's outer periphery. In other words, even if the most advanced conventional nip pressure control method was adopted, it was impossible for the operator to perfectly control the winding tightness.

The present invention has been proposed in order to solve the above-mentioned conventional drawbacks, and it is possible to provide the operator with information on internal changes in the roll being wound by a web winder, and to accurately control the winding stiffness. The present invention aims to provide a web winding device that can perform the following steps.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 3 shows a winding roll diameter detection mechanism and a winding length detection mechanism in a two-drum winder showing an embodiment of the present invention.

First, the detection of the roll diameter will be described. In the figure, the rider roll 7 is placed on the core 8 at the beginning of winding, and a predetermined pressing force is applied onto the core 8. As the winding diameter increases, the rider roll 7 moves upward, and at this time, the roller chain 9 suspending the rider roll 7 also moves, and the chain wheel 10 rotates.

Furthermore, a mechanism is provided in which the rotation of the chain wheel 10 is transmitted to the pulley 12 through a transmission means such as a timing belt 11, and the rotation of the pulley 12 is transmitted to a rotary encoder 14 (winding diameter signal transmitter) connected to the pulley shaft 13. By providing this, a change in the winding diameter can be detected as a pulse signal etc. emitted from the rotary encoder 14.

In a two-drum winder, the relationship between the amount of movement of the rider roll 7 and the winding diameter is not directly proportional, but by calculating using a certain equation, it is possible to know the winding diameter from the pulse signal obtained from the rotary encoder 14. It is easy and in order to perform calculation processing,
It is sufficient to use a known microcomputer.

Next, referring to FIG. 3, to explain winding length detection, this method is well known in the industry. The winding length can be easily determined by detecting it as a pulse signal by the connected pulse generator 16 (winding length signal transmitter) and multiplying the obtained pulse signal by the winder drum diameter and a constant. It is well known that this calculation process can be easily performed using a microcomputer.

Next, as shown in FIG. 4, if the winding length L and winding diameter D signals are processed by an appropriate program in the microcomputer 17, the increase in area of the winding diameter can be calculated for each fixed winding length. It is easy to extract it as output. For example, while the winding length L changes from 2000 m to 2500 m, the area of the winding roll changes from Amm ² to 2500 m.
If there is an area change of Bmm ² during the change from m to 3000m, and if A>B, then when the thickness of the winding web is constant, the apparent density of the winding roll is 2000m →
This means that it became larger between 2500m and 3000m than between 2500m, and it can be concluded that the winding stiffness also became harder.

Generally, the web thickness is precisely controlled in the previous process and can be considered constant, so using the method described above, the increase in the area of the take-up roll for each fixed length of web is displayed on a CRT, etc. By displaying this information on the device, the operator can easily know changes in the winding hardness (changes in apparent density) inside the winding roll, and use this data as a basis for making judgments about nip pressure, operating tension, and winder drum load. It becomes possible to set the flat ratio control curve to the best condition.
In addition, △D ² /△L in Fig. 4 is the change ratio of the take-up roll cross-sectional area with respect to the change in winding length, 18 is the nip roll system, 19 is the tension control system, and 20 is the winder drum torque control system. be.

FIGS. 5 and 6 are examples of displays on a CRT, both of which are possible using a microcomputer program.

Also, a fixed target value is given to the increase rate of the cross-sectional area of the take-up roll for a fixed winding length, and this target value is compared with the value obtained from the actual measurement signal using a microcomputer, and the deviation is set to zero. By transmitting control signals to the nip pressure control system, operating tension control system, winder drum torque control system, etc., and modifying the control curves of each control system using these signals, closed-loop winding tightness control is completed. death,
Accurate winding tightness control can be performed.

The present invention is configured as described in detail above, and not only provides the winder operator with information regarding changes in the hardness inside the winding roll, but also enables feedback control of winding hardness control, and as a result, It can have a great effect on improving the quality of rolls.

In addition, it is basic to know the apparent density inside the roll by detecting changes in the winding length and winding diameter and processing them with a microcomputer. It is applicable as long as changes in the winding diameter can be detected. Note that the present invention applies to a single drum winder, a two-drum winder,
It can be applied to center winders, paper machine reels, etc., and has a very wide range of applications.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a conventional web winding device, Fig. 2 is a diagram showing the relationship between the winding roll diameter and the nip pressure on the winder drum, and Fig. 3 is a side view showing an example of a conventional web winding device. FIG. 4 is a side view of the web winding device shown in FIG. 4, and FIG. FIG. 6 is a diagram showing an example of a display on a CRT. Explanation of main parts of the figure 1... Winding roll, 2,
3... First and second winder drums, 7... Rider roll, 14... Winding diameter signal transmitter, 16... Winding length signal transmitter.

Claims (1)

[Claims] 1 Compare the rate of change in cross-sectional area of the take-up roll corresponding to each fixed winding length, a pre-given target value, etc., and send an output signal to the nip pressure control system, operating tension control system, and winder drum so that the deviation becomes zero. 1. A web winding device comprising a winding stiffness control system configured by applying a load to a load distribution control system.