JP2023108704A - Press roller - Google Patents

Abstract

To provide a press roller which suppresses generation of wrinkles in a thin film which is a pressing object, while holding versatility capable of corresponding to various thin film brands.SOLUTION: A press roller for pressing a thin film to a wound product obtained by winding a thin film or to a conveyance guide roller for sending out the thin film, includes a rotary shaft, a cylindrical core, and a cylindrical elastic body layer. The cylindrical core is coaxially fixed to the rotary shaft. The cylindrical elastic body layer is fastened to the core so as to cover an outer peripheral surface of the cylindrical core. Then, the elastic body layer has a groove provided at the outer peripheral surface so that irregularity of the outer peripheral surface repeats along an axial direction and it extends in a direction crossing the axial direction. Also, the groove is deeper toward both end parts from a central part in the axial direction, and it is inclined in such a manner that it comes closer to the end part which does not stride over the central part out of both end parts according as it goes toward a groove opening end from a groove bottom.SELECTED DRAWING: Figure 7

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound product obtained by winding a thin film or a pressure roller for pressing a thin film against a conveying guide roller for sending out the thin film.

FIG. 1 is a schematic diagram illustrating a usage pattern of a pressure roller according to the prior art. As shown in the illustrated example, the pressure roller 1 is applied to a wound product 61 wound by a winding roller 51 for winding a thin film 60 such as a plastic film, a transport guide roller 53 for transporting the thin film 60, and the like. used to press the When the thin film 60, which is the produced product, is wound on the winding roller 51, in order to suppress the entrainment of air into the wound product 61 wound into a roll, the vicinity of the winding boundary of the thin film 60, which is the product. pressure is applied to Further, when the thin film 60 is conveyed in the production machine, if the thin film 60 slips on the conveying guide roller 53, which is a driving roll, the driving system will not work. Pressure is applied to compress the membrane 60 . In the illustrated example, the pressing force of the pressing roller 1 is generated by an actuator 9 .

FIG. 2 is a schematic diagram illustrating a schematic configuration of the pressing roller 1. As shown in FIG. 3 is a cross-sectional view illustrating a schematic configuration of the pressing roller 1. As shown in FIG. As illustrated in these figures, the pressure roller 1 generally has a structure in which the outer peripheral surface of a cylindrical core 11 is covered with a cylindrical elastic layer 3 such as rubber. The core 11 is supported by the rotary shaft 5, and the rotary shaft 5 is rotatably supported by the bearing 7. As shown in FIG. An actuator 9 is connected to the bearing 7 . A pressing force of the actuator 9 is transmitted from the bearing 7 to the elastic layer 3 through the rotating shaft 5 and the core 11 . As a result, the elastic layer 3 sandwiches the thin film 60 to be pressed against the wound product 61 or the transport guide roller 53 (see FIG. 1). In the illustrated example, the actuator 9 is arranged to push the piston out with fluid delivered into the cylinder.

In recent years, the demand for thin films with a thickness of less than 20 microns has increased in a wide variety of films, such as plastic films used for battery separators and metal foils for electrodes. In order to wind or convey the thin film 60 having a thickness on the order of microns, the pressure roller 1 is required to have an accuracy equal to or higher than that of the conveying guide roller 53 .

As exemplified in an exaggerated manner in FIG. , the pressing force is strong at both ends near the actuator 9 and is weak at the central portion where the reaction force is received. As a method of alleviating this non-uniformity, it is assumed to increase the pressing force, but the pressing force to be applied must be set to a level that does not give permanent deformation to the thin film 60, and cannot be set excessively. Therefore, as illustrated in FIG. 5, the central portion of the pressing roller 1 is lifted from the thin film 60, and the thin film 60 is pulled by both ends of the thin film 60 receiving the external force, causing wrinkles. FIG. 5 is a schematic view of the pressing roller 1 viewed from the pressing surface, and the surface region of the elastic layer 3 in contact with the thin film 60 is shown in white.

In order to deal with this problem, a pressure roller 2 has been proposed which has a structure in which only the central portion of a cylindrical core 11 is supported by a rotating shaft 6, as schematically illustrated in the sectional view of FIG. The pressure roller described in Patent Document 1 is also based on the same idea. However, the pressing roller 2 needs to be precisely manufactured for each of the various brands of thin films 60 to be pressed, which causes problems of lack of versatility and high cost.

JP 2017-173393 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a press roller that suppresses the occurrence of wrinkles in the thin film to be pressed while maintaining versatility that can be applied to a wide variety of thin film brands. aim.

In order to achieve the above object, a first aspect of the present invention provides a wound product obtained by winding a thin film or a pressure roller for pressing a thin film against a conveying guide roller for sending out the thin film, comprising: , a cylindrical core, and a cylindrical elastic layer. A cylindrical core is coaxially fixed to the rotating shaft. A cylindrical elastic layer is fixed to the core so as to cover the outer peripheral surface of the cylindrical core. The elastic layer has grooves formed on its outer peripheral surface so that the unevenness of the outer peripheral surface repeats along the axial direction and extends in a direction crossing the axial direction. In addition, the groove is deep from the central portion in the axial direction to both end portions, and the end portion of the both end portions that does not straddle the central portion as it moves from the groove bottom toward the groove opening end. is inclined to approach

According to this configuration, when the elastic layer presses the thin film to be pressed, the portions of the elastic layer sandwiched between the grooves, i.e., the individual wall-like portions projecting from the bottom of the grooves, are pushed to their bases. The thin film is flexibly pressed because it deforms in the direction of inclination due to the bending moment generated in the thin film. In addition, since the depth of the groove increases from the axial center to both ends, flexibility increases from the center to both ends. As a result, the conventional problem of non-uniformity in the axial direction, in which the pressing force is strong at both ends and weak at the central portion, is eliminated or improved, and wrinkles are less likely to occur in the thin film to be pressed. The thin film to be pressed is flexibly pressed by deforming in the direction of inclination due to the bending moment generated at the base of each wall-shaped portion protruding from the bottom of the groove. This eliminates the need for precision fabrication for each brand of thin film, resulting in high versatility.

According to a second aspect of the present invention, there is provided the pressing roller according to the first aspect, wherein the groove has a spiral groove extending spirally from the central portion to the both ends.
According to this configuration, the edge of the thin film to be pressed is prevented from falling into the groove while it is moving to a stable position with reference to the edge of the raw fabric or due to the warp of the thin film. As a result, the problem that the end of the thin film falls into the groove and is folded is suppressed.

As described above, according to the present invention, it is possible to realize a pressing roller that suppresses the generation of wrinkles in the thin film to be pressed while maintaining the versatility of being able to handle a wide variety of thin film brands.

FIG. 4 is a schematic diagram illustrating a usage pattern of a pressure roller according to the prior art; It is a schematic diagram illustrating a schematic configuration of a pressure roller according to the prior art. 3 is a cross-sectional view illustrating a schematic configuration of a pressure roller in FIG. 2; FIG. FIG. 3 is a schematic diagram illustrating a problem of the pressure roller of FIG. 2; FIG. 3 is a schematic diagram illustrating a problem of the pressure roller of FIG. 2; FIG. 10 is a cross-sectional view illustrating a schematic configuration of a pressure roller according to another prior art; 1 is a cross-sectional view illustrating a schematic configuration of a pressure roller according to an embodiment of the invention; FIG. 8 is an enlarged cross-sectional view of an elastic layer of the pressing roller of FIG. 7; FIG. FIG. 8 is a schematic view of the pressing roller of FIG. 7 viewed from the pressing surface; 8 is a drawing-substituting photograph illustrating the arrangement of grooves of the pressure roller of FIG. 7;

FIG. 7 is a cross-sectional view illustrating a schematic configuration of a pressure roller according to one embodiment of the invention. This pressing roller 101 has a rotating shaft 5 , a cylindrical core 11 , and a cylindrical elastic layer 21 . The core 11 is coaxially fixed to the rotating shaft 5 . The elastic layer 21 is fixed to the core 11 so as to cover the outer peripheral surface of the cylindrical core 11 . Here, "fixing" means that it is sufficient to maintain the position so as not to shift from each other, and the elastic restoring force of the elastic layer 21 may be used for adhesion, or an adhesive may be used for fixing. The elastic layer 21 is made of synthetic rubber, for example. The rotating shaft 5 and the core 11 are made of metal, for example.

FIG. 8 is an enlarged cross-sectional view of the elastic layer 21 of the pressure roller 101. As shown in FIG. The elastic layer 21 has grooves 23 provided on its outer peripheral surface so that the unevenness of the outer peripheral surface repeats along its axial direction. The groove 23 is provided on the outer peripheral surface of the elastic layer 21 so as to extend in a direction crossing the axial direction of the elastic layer 21 . The direction crossing the axial direction may be a direction orthogonal to the axial direction or a direction crossing obliquely. As an example, the groove 23 is formed as a spiral groove, as clearly shown in FIG. 10, which will be described later. The groove 23 is deep from the central portion in the axial direction to both ends, and as it goes from the bottom of the groove 23 to the open end (that is, the upper surface of the groove 23 in the figure), it straddles the central portion of both ends. sloping towards the non-existent end. In the illustrated example, in particular, the grooves 23 are arranged so that unevenness is repeated on the outer peripheral surface along the axial direction at predetermined intervals. In addition, the groove 23 has a plane perpendicular to the axial direction at the center in the axial direction as a virtual plane of symmetry, and the groove 23 is deeper toward both ends, and is deeper toward the surface from the bottom of the groove. sloped towards the end of the

Since the pressing roller 101 is configured as described above, when the elastic layer 21 presses the thin film 60 , the portion of the elastic layer 21 sandwiched between the grooves 23 , that is, the individual portions projecting from the bottom of the grooves 23 . The wall-like portion of the is deformed in an inclined direction by a bending moment generated at its base (that is, base end), so that the thin film 60 (see FIG. 1) to be pressed is flexibly pressed. In addition, since the depth of the groove 23 increases from the central portion to both ends in the axial direction, flexibility increases from the central portion to both ends. As a result, the non-uniformity in the axial direction in which the pressing force is strong at both ends and weak at the center, which has been a problem in the past, can be eliminated or improved as shown in FIG. Wrinkles are less likely to occur. FIG. 9 is a schematic view of the pressing roller 101 viewed from the pressing surface, and the surface region of the elastic layer 21 in contact with the thin film 60 is shown in white.

The thin film 60 to be pressed is flexibly pressed by each wall-like portion protruding from the bottom of the groove 23 being deformed in the direction of inclination by the bending moment generated at the base of the wall-like portion. Unlike the existing pressure roller 2, the pressure roller 101 does not need to be precisely manufactured for each brand of thin film 60, and is highly versatile.

FIG. 10 is a drawing-substituting photograph illustrating the arrangement of the grooves 23 of the pressing roller 101, showing an enlarged view of part of the outer peripheral surface of the elastic layer 21. As shown in FIG. In the illustrated example, the groove 23 is formed as a spiral groove that spirally extends from the central portion in the axial direction of the elastic layer 21 to both ends. The helical groove 23 extends helically to the closer roller end with a plane orthogonal to the axial direction at the axial center as a virtual plane of symmetry 25 . The spiral groove 23 is formed of a plurality of spiral grooves, and when the thin film 60 (see FIG. 1) is passed through the device, the end of the thin film 60 on the roller is in a stable position with respect to the end of the original fabric. It is possible to prevent the thin film 60 from falling into the groove 23 due to the warp of the thin film 60 while it is moving to the right side. Due to the nature of thin film transport, the thin film 60 runs perpendicular to the axial direction of the roller. The ends of the tape may fall off and crease. On the other hand, by arranging the grooves 23 in a spiral shape that is twisted in the axial direction, defects such as breakage can be more effectively suppressed.

7, the pressure roller 101 is not limited to a driven roller that does not transmit the driving force to the target thin film. may be Further, the thin film 60 to be pressed is not limited to a plastic film, and may be, for example, a metal thin film.

Reference Signs List 1, 2 pressing roller 3 elastic layer 5 rotating shaft 7 bearing 9 actuator 11 core 21 elastic layer 23 groove 25 plane of symmetry 51 winding roller 50, 53 conveying guide roller 60 thin film , 50, 61 wound product, 101 pressure roller.

Claims (2)

A wound product obtained by winding a thin film or a pressure roller for pressing a thin film against a conveying guide roller for feeding the thin film,
a rotating shaft;
a cylindrical core coaxially fixed to the rotating shaft;
a cylindrical elastic layer fixed to the core so as to cover the outer peripheral surface of the cylindrical core;
The elastic layer has grooves formed on its outer peripheral surface so that unevenness of the outer peripheral surface repeats along the axial direction and extends in a direction intersecting the axial direction,
The groove is deep as it extends from the central portion in the axial direction to both end portions, and as it moves from the groove bottom toward the groove opening end, it approaches the end portion of the both end portions that does not straddle the central portion. Pressing rollers that are slanted like so. 2. The pressure roller according to claim 1, wherein said groove has a spiral groove extending spirally from said central portion to said end portions.