JPH0229076Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a film winding device such as a slitter or a winder, and more particularly to a film winding device having a pressure roll in the winding section.

[Prior Art] It is generally well known that it is effective to wind a film while pressing a pressure roll against the film product being wound, in order to wind the film into a roll without hesitation and with appropriate hardness. Are known.

The structure of the pressure roll is usually as shown in FIGS. 5 and 6, for example. The contact pressure roll 1 shown in FIG. 5 has a roll ring 2 rotatably supported by a through shaft 4 via bearings 3 at both ends thereof, and the contact pressure roll 5 shown in FIG.
In this example, shafts 7 protrude from both ends of a roll ring 6, and the shafts 7 are rotatably supported by an arm for a pressure roll or the like via a bearing 8. For any type of contact pressure roll,
During winding, as shown in FIG. 7, forces are applied from the shafts 4 and 7 of the pressure rolls 1 and 5, so that the surfaces of the pressure rolls 1 and 5 are properly aligned with the product roll 9 being wound. The pressing force prevents the film from straying on the product roll 9, and the winding hardness of the product roll 9 is adjusted by adjusting the pressing force.

[Problems to be solved by the invention] However, when winding a film using a contact pressure roll having the structure as described above, the force P from the shafts 4 and 7 side causes the roll to ring 2,6
A minute deflection occurs, and a distribution as shown in A occurs in the surface pressure between the surfaces of the pressure rolls 1 and 5 and the surface of the product roll 9. Since it is originally difficult for air to escape from the center of the product roll 9, if a distribution occurs where the surface pressure at the center is lower than the surface pressure at both ends of the product roll 9 as described above, the contact pressure rolls 1 and 5 will be pressed. This may result in insufficient air escape in the central portion, and as shown in FIG. 8, an undesirable amount of air may be trapped in the winding layer 10 in the central portion. In this way, the air caught in the center winding layer during the winding process gradually escapes after winding, but after the air escapes, the winding layer that had been stretched by the trapped air becomes sagging. ,
As shown in FIG. 9, a problem arises in that wrinkles 11 are formed in the center.

In order to solve the above-mentioned problems, the purpose of this invention is to equalize the surface pressure of the contact pressure roll against the film product, make it easier for air to escape from the center of the film product, and prevent the occurrence of wrinkles. shall be.

[Means for Solving the Problems] The film winding device of the present invention, which meets this objective, applies pressure to the shaft of the pressure roll to apply pressure to the surface of the pressure roll to the rolled film product being wound. In a winding device for winding a film while pressing the film, the contact pressure roll is constituted by a roll in which the connecting portion between the shaft side of the contact pressure roll and the roll ring side is only at the center in the longitudinal direction of the roll. There is.

Here, as for the position of the connecting part between the shaft side of the pressure roll and the roll ring side, the amount of deviation of the center position of the connecting part from the roll longitudinal direction position is 10 of the roll surface length.
It is preferable that it be within 1/2.

[Function] In the winding device having such a configuration,
Since the connection between the shaft side of the pressure roll and the roll ring side is located only at the center in the longitudinal direction of the roll, the force from the shaft of the pressure roll is transmitted through the center of the roll ring in the longitudinal direction to the entire roll ring. is transmitted to. In other words,
The point of application of the load from the shaft side to the roll ring side is at the center in the longitudinal direction of the roll. Therefore, even if the shaft itself is bent as shown in Figure 7, the roll ring is not bent, and the surface pressure between the roll ring surface and the film product roll surface is in the longitudinal direction of the roll. is maintained uniformly. When the surface pressure is equalized, the formation of local air pockets is prevented, and the formation of wrinkles due to air escape from the air pockets is prevented.

[Embodiments] Hereinafter, preferred embodiments of the film winding device of the present invention will be described with reference to the drawings.

1 and 2 show a film winding device according to an embodiment of the present invention, and numeral 21 in the figures indicates a film. As shown in FIG. 2, the film 21 is wound up into a roll-shaped film product 23 while being pressed by a contact pressure roll 22. 2
4 indicates a winding core.

As shown in FIG. 1, the pressure roll 22 is composed of a shaft portion 25 and a roll ring 26, and when the shafts 27 on both sides are urged toward the film product 23, the surface of the roll ring 26 is removed. Film products 23
A surface pressure is applied to the surface. This biasing toward the film product 23 is performed by an arm for a contact pressure roll (not shown), and the shaft 27 is rotatably supported by the arm or the like. The surface of the roll ring 26 of the contact pressure roll 22 is coated with rubber 28 with a thickness of about 3 to 30 mm and a rubber hardness of about 20 to 80 degrees, so that it comes into contact with the film product 23 with appropriate elasticity. be done.

The shaft portion 25 of the contact pressure roll 22 has a center portion 29 in the roll longitudinal direction formed as a large diameter portion with respect to the shafts 27 on both sides, and this large diameter portion 29 is configured as a connecting portion 30 with the roll ring 26. ing. This connection is performed, for example, by press fitting, shrink fitting, or the like. Other than the connecting portion 30 at the center in the longitudinal direction of the roll, the shaft portion 25
A connecting portion between the roll ring 26 and the roll ring 26 is not provided.
Therefore, both sides of the connecting portion 30 of the roll ring 26 are free ends.

In addition to the structure shown in FIG. 1, the pressure roll may have a structure as shown in FIG. 3. That is, the shaft side may be divided into a member 32 connected to the roll ring 31 at the center in the longitudinal direction of the roll and a through shaft (not shown) inserted through the member 32. The through shaft and the member 32 are connected to each other with a bearing interposed between the through shaft and the member 32.
may be rotatably supported, or the through shaft and the member 32 may be fixed and both ends of the through shaft may be rotatably supported by bearings.

In addition, it is desirable to keep the wall thickness of the roll ring to an appropriate level so that the rigidity of the roll ring does not decrease too much, but if it is too small, it will be difficult to shrink fit the shaft side, so it will increase the rigidity of the roll ring and make it easier to manufacture. It is desirable that the settings be made in appropriate harmony with gender.

In the embodiment apparatus configured as described above, the traveling film 11 is transferred to the pressure roll 2.
The film product 23 is wound up while being pressed by the film product 23, and the surface pressure between the contact pressure roll 22 and the film product 23 during winding is as shown in FIG. Since the connecting portion 30 between the shaft portion 25 of the pressure roll 22 and the roll ring 26 is provided only at the central portion in the longitudinal direction of the roll, the biasing force from the shaft portion 25 side is not applied to the roll ring 26 along the roll longitudinal direction. Direction is transmitted through the central part. Therefore, the shaft portion 25
The point of load application of the force applied from the side towards the film product 23 on the film product 23 is at the center in the longitudinal direction of the roll, that is, at the center of the roll surface length of the roll ring 26. Since the other portions are free ends, they are pressed against the film product 23 via the rigidity of the roll ring 26. Therefore, roll ring 2
6, no deflection occurs in the direction in which both sides of the film product 23 in the film width direction are strongly abutted. Therefore, the surface pressure between the contact pressure roll 22 and the film product 23 does not decrease at the center, and is almost uniform over the entire width of the film product 23, as shown in FIG. Distribution B is obtained.

When a film winding test was conducted using the contact pressure roll 22 shown in FIG. 1, the following results were obtained.

The test conditions were as follows: A polyester film with a thickness of 9 μ and a width of 620 mm was wound at a speed of 200 m/min, and the surface pressure of the pressure roll was set to 80 kg/m. A comparison was made with the conventional contact pressure roll shown in the figure.

After winding, film products produced using conventional contact pressure rolls have severe wrinkles in the center, but in the case of the contact pressure roll 22 of the present invention, there are almost no wrinkles, or even if they do occur, the wrinkles are very slight. It was from.

[Effects of the invention] As explained above, when using the film winding device of the invention, the structure of the pressure roll is such that the connecting portion between the shaft side and the roll ring side is only at the center in the longitudinal direction of the roll. As for the structure, the point of load application from the contact pressure roll to the film product is at the center in the longitudinal direction of the roll, and the roll rings on both sides have a free end structure, so the surface pressure on the film product on the roll surface is applied over the entire width of the film product. It can be made almost uniform, and the effect is that air can easily escape from the film product winding layer and wrinkles can be prevented.

[Brief explanation of drawings]

1 is a sectional view of a pressure roll in a film winding device according to an embodiment of the present invention, FIG. 2 is a side view of a film winding device using the pressure roll of FIG. 1, and FIG. The figure is a cross-sectional view of another contact pressure roll, the fourth
The figure is a plan view of a film winding device showing the surface pressure distribution when winding a film using the contact pressure roll shown in Figure 1, Figure 5 is a sectional view of a conventional contact pressure roll, and Figure 6 is a conventional contact pressure roll. A cross-sectional view of another contact pressure roll, FIG.
Figure 6 is a plan view of a film winding device showing the surface pressure distribution when winding a film using the contact pressure roll, and Figure 8 is an air pocket that occurs when the surface pressure distribution is as shown in Figure 7. FIG. 9 is a diagram illustrating the structure of a film-wound layer showing how the air pockets in FIG. 8 have changed into wrinkles. 21...Film, 22...Contact pressure roll, 23
... Film product, 24 ... Winding core, 25 ...
...shaft part, 26, 31 ... roll ring, 27 ... shaft,
28...Rubber, 29...Large diameter portion, 30...Connecting portion, 32...Shaft side member.

Claims (1)

[Scope of utility model registration request] In a winding device that winds a film while pressing the surface of the pressure roll against a rolled film product being wound by energizing the shaft of the pressure roll, the pressure roll is placed on the shaft side of the pressure roll. 1. A film winding device characterized in that the film winding device comprises a roll in which the connecting portion between the roll ring and the roll ring side is located only at the central portion in the longitudinal direction of the roll.