JPH0510986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tension control device for a film after being coated with a coating agent by a coating machine.

[Conventional technology]

The general roll arrangement and coating process of conventionally used coating machines are as shown in Figure 2.
A part of a rotatably supported metering roll b is attached to a container a filled with paint so as to be immersed in the paint, and as the roll b rotates,
The paint adhering to the outer periphery of roll b also adheres to coating roll c, which contacts metering roll b above and rotates in the same direction. Furthermore, above the coating roll c, there is a back up roll d rotating in the same direction as the coating roll c. A material e to be coated such as a film is fed between the coating roll c and the back-up roll d in a direction not shown as shown by the arrow. is coated and sent to a dryer (not shown) via a suction roll f located at the top.

At this time, the speed reference of the coating line is the backup roll d, and the suction roll f is used for tension cutting with the dryer after coating.

Managing the tension between the coating and the suction roll f is particularly important, and generally the suction roll f is provided with an independent motor to apply a draw to the back-up roll d.

[Problem to be solved by the invention]

However, there was a problem in that the tension holding power of the back-up roll d was weak, and the tension value was set based on the operator's intuition, making stable operation difficult.

[Purpose of the invention]

In view of this, the present invention provides a tension control device for a coating machine in which a nip roll for holding the film is provided on the back up roll, and a tension detection device is provided between the film passes of the back up roll and the suction roll. This was done for the purpose of detecting the tension between the back up roll and the suction roll, automatically setting the draw (speed ratio) value based on the tension, and controlling the tension after coating.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a coating machine comprising a three-piece reverse coater device having a metering roll, a coating roll, and a back-up roll, and a suction roll, in which the back-up roll is provided with a nip roll. , a tension detection device is provided between the film paths of the suction roll and the back-up roll, and this tension detection device feeds back the detected value to the suction roll drive device to determine the rotational speed of the back-up roll and the suction roll. The present invention is characterized by having means for controlling the ratio to a predetermined value.

[Effect]

In the above tension control device, the detected value is fed back to the suction roll drive device and the rotational speed ratio of the back up roll and suction roll is controlled to a predetermined value, so tension control is performed and a uniform coating film is achieved. can get.

〔Example〕

The present invention will be explained below with reference to the embodiment shown in FIG.

The tension control device for a coating machine according to the present invention is a coating machine comprising a three-bar coater device having a metering roll 1, a coating roll 2, and a back-up roll 3, and a suction roll 4. It consists of a nip roll 5 provided on the roll 3, and a tension detection device 7 provided between the suction roll 4 and the film path 6 of the back up roll 3.

The metering roll 1 rotatably supported
is installed so that it is partially immersed in a container 8 filled with paint, and as the roll 1 rotates, the paint adhering to the outer periphery comes into contact with the metering roll 1 above and rotates in the same direction. It also adheres to the coating roll 2 that is being coated.

Above the coating roll 2, there is a back-up roll 3 that is close to the coating roll 2 and rotates in the same direction. is provided.

The material to be coated, such as film, is
and the back-up roll 3, and between the back-up roll 3 and the coating roll 2. On the other hand, the paint adhering to the outer circumference of the metering roll 1 accumulates in the recess formed by the circumferential surface of the coating roll 2, which is rotating in the same direction as the metering roll 1. Since they are rotating in the same direction, paint also accumulates in the recesses formed on the peripheral surfaces of the coating roll 2 and the back-up roll 3, and one side is coated by the coating roll 2. The coated film is sent to a suction roll 4 provided at the top, and further sent to a dryer (not shown).

Here, a film path 6 is formed between the back-up roll 3 and the suction roll 4,
The tension detection device 7 is provided between them.

According to the present invention, with such a configuration, the film fed between the coating roll 2 and the back-up roll 3 is strongly held by the back-up roll 3 via the nip roll 5, so that the film can be transferred to the coating line. A reference speed of 1 is obtained, the overall tension can be controlled to a stable value, and the tension of the film is detected by the tension detection device 7 provided in the film path 6, and this detected value is commanded to the suction roll 4. An appropriate draw (speed ratio) value is automatically set to form a uniform coating film.

〔Effect of the invention〕

As explained above, according to the present invention, since the coating line is provided with a nip roll and a tension detection device, it is possible to control the speed of the line and the tension after coating, thereby making the coated surface even and homogeneous. can do.

[Brief explanation of drawings]

FIG. 1 is a roll layout diagram of a coating machine according to the present invention, and FIG. 2 is a roll layout diagram of a conventional coating machine. 1...Metaling roll, 2...Coating roll, 3...Backup roll, 4...Suction roll, 5...Nip roll, 6...Film pass, 7...Tension detection device.

Claims (1)

[Claims] 1. In a coating machine consisting of a three-piece reverse coater device having a metering roll, a coating roll, and a back-up roll, and a suction roll, the back-up roll is provided with a nip roll, and the suction roll and the back-up roll are provided with a nip roll. A tension detection device is provided between the film paths, and the tension detection device feeds back the detected value to a suction roll drive device to control the rotational speed ratio of the back-up roll and the suction roll to a predetermined value. A tension control device for a coating machine.