JPH04213544A - Tension control method for sheet-like material - Google Patents

Abstract

PURPOSE:To maintain the tension of a sheet-like material between respective rolls at the predetermined value by determining a ratio of the speed set values of electric motors for driving respective rolls so as to obtain the predetermined value. CONSTITUTION:A ratio of speed set values is determined for electric motors 6 to 8 to drive each of drive rolls 1 to 5, using the expression I where the sectional area of a sheet-like material is (a), Young's modulus thereof is E, the diameter of the 'i'-th roll is Di, the 'i'-th gear ratio is Gi, the speed set value of the 'i'-th electric motor is Wi, the tension of the sheet-like material at the delivery side of the 'i'-th roll is Ti, the mechanical loss of a driven roll laid between the 'i'-th roll and the '(i+1)'-th roll is Li, and the diameter of the aforesaid driven roll is ri. According to the aforesaid construction, the tension of the sheet-like material can be maintained at the predetermined value without any restriction by processing environment for the material and the constitution of a device.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the tension of sheet materials such as films and papers.

0002

[Prior Art] Conventionally, sheet-like material processing and processing equipment includes an unwinding roll for unwinding the sheet-like material, a plurality of delivery rolls for transporting the sheet-like material to a processing and processing section, and a sheet-like material processing and processing device. There are take-up rolls that take up the material and multiple electric motors that drive these rolls. In this sheet material processing/processing apparatus, the tension of the sheet material is controlled in an unwinding section, a processing/treatment section, and a winding section. For example, in a film deposition apparatus that deposits a metal film on a film, wrinkles occur in the film when the tension of the film decreases in the deposition section (processing/treatment section). In addition, if the tension ratio between the film on the input side and the exit side of the roll increases, the roll and film will slip, causing scratches on the film surface and reducing the quality of the product, so it is necessary to maintain the tension between each roll at a predetermined value. .

A conventional example of a tension control device for sheet material is shown in FIG. The tension control device shown in FIG. 2 includes a tension detector 20 installed on the traveling path of the sheet-like material 17, and the speed of the electric motor 8 that drives the roll 4 so that the tension detection signal obtained by the tension detector 20 becomes the set tension. is adjusted to maintain the tension of the sheet material 17 at a predetermined value.

0004

In the conventional sheet-like material tension control device shown in FIG. However, it cannot be applied when there are restrictions on the installation of the tension detector 20 due to the processing environment of the sheet material 17 or the configuration of the device. Further, there is a problem in that the tension detector 20 is required for each roll, resulting in high cost.

The present invention has been proposed in view of the above-mentioned problems, and its purpose is to maintain the tension of a sheet-like material at a predetermined value without being restricted by the processing environment of the sheet-like material or the configuration of the equipment. The object of the present invention is to provide a method for controlling the tension of a sheet-like material, which can reduce the manufacturing cost by eliminating the need for a tension detector between each roll.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention changes the ratio of the speed setting values of the electric motors that drive each roll so that the tension between each roll becomes a predetermined tension. The cross-sectional area of is a, the Young's modulus of the sheet material is E, the i-th roll diameter is Di, the i-th gear ratio is Gi, the speed setting value of the i-th motor is Wi, the sheet material on the exit side of the i-th roll Ti is the tension of
If the diameter of the non-driving roll installed between the l-th roll is ri, then the following formula (1), that is,

[0007]

[Math 2]

It is characterized in that it is determined by:

[0009]

[Operation] By the means described above, a predetermined tension can be applied between each roll without installing a tension detector. Furthermore, since the increase in tension due to mechanical loss of the non-driving rolls installed between the driving rolls is taken into account, it is possible to control the tension with high precision.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically explained below based on embodiments shown in the drawings. FIG. 1 shows an example of the configuration of a web processing/processing apparatus according to the present invention. In the figure, 1 is an unwinding roll, 2-
4 is a delivery roll, 5 is a take-up roll, and an electric motor 6~
It is driven by 8. In addition, the electric motors 6 to 8 are equipped with speed detectors 9 to 8.
The rotational speed is detected at 11, and the speed is controlled by speed controllers 12-14. 15 and 16 are non-driving rolls, 17
indicates sheet material.

In FIG. 1, the speed setting values of the electric motors 6 to 8 are determined by the method described below so that the tensions on the exit side of the rolls 2 and 3 are T1 and T2, respectively. However, it is assumed that the unwinding force T1 and the winding tension T4 are tension-controlled and maintained at constant values. The tension range that can be realized with the configuration shown in Fig. 1 is expressed by the following formula (2):

0012

[Math 3]

[0013] Here, μi is the friction coefficient between roll i and the sheet material, and θi is the winding angle of the sheet material. Li is the mechanical loss of the non-driving roll between rolls i and i+1, r
i is the diameter of the non-driven roll and is a fixed value measured in advance without sheet material. T2, T3 given within the range that satisfies equation (2)
The speed setting values of electric motors 6 to 8 W2 , W3 , W
4 is given by the following equations, that is, equations (3) and (4).

[0014]

[Math 4]

Here, a is the cross-sectional area of the sheet material, E is the Young's modulus of the sheet material, Di is the i-th roll diameter, and Gi is the gear ratio. Equations (3) and (4) give the speed ratio, and W2 and W4 can be obtained by setting W3 with the roll 3 as the speed master. As described above, the required tensions T2 and T3 can be given by calculating the equation (3) with the calculator 18 and the equation (4) with the calculator 19 and using them as the speed setting values.

[0016]

[Effects of the Invention] As described above, according to the present invention, the ratio of the speed setting values of the electric motors that drive each roll is determined by equation (1) so that the tension between each roll becomes a predetermined tension. The tension between the rolls can be set to a predetermined tension,
As a result, it is possible to improve the quality of sheet materials and reduce the cost of equipment.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 Drive roll 2 Drive roll 3 Drive roll 4 Drive roll 5 Drive roll 6 Electric motor 7 Electric motor 8 Electric motor

Claims (1)

[Claims] Claim 1: When a plurality of rolls are driven by a plurality of electric motors corresponding to the same rolls to convey a sheet-like material such as a film or paper that is continuous in the length direction, the cross-sectional area of the sheet-like material is a, the Young's modulus of the sheet material is E
, the i-th roll diameter is Di, the i-th gear ratio is Gi, i
The speed setting value of the th electric motor is Wi, the tension of the sheet material on the exit side of the ith roll is Ti, the mechanical loss of the non-driving roll installed between the ith and i+l rolls is Li, the i-th and i+l Assuming that the diameter of the non-driving roll installed between the rolls is ri, the ratio of the speed setting values of the respective electric motors is determined by the following equation (1), that is, A tension control method for a sheet-like material, characterized by maintaining the tension of the sheet-like material at a predetermined value.