Film roll manufacturing device and film roll

Abstract

To provide a film roll manufacturing device that allows easy positioning when supporting a film roll, and a film roll manufactured by the manufacturing device.SOLUTION: A film roll manufacturing device includes a first support device, a second support device, and a cutting device. Each of the two support devices has a main body that is movable in the axial direction and a plurality of support parts that are expandable and contractable in the radial direction. Each of the plurality of support parts has a first portion and a second portion. The first portion abuts against the inner circumferential surface of the axial end of the core to support the inner circumferential surface from the inner circumferential side, and the second portion extends radially and abuts against the axial end face of the core to support the end face from the axial outside.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a film roll manufacturing apparatus and a film roll. [Background technology]

[0002] There is known an apparatus for processing packaging films (hereinafter referred to as film rolls) such as food packaging films, as shown in Patent Document 1. The film roll has, for example, a cylindrical core and a resin film (hereinafter referred to as resin film) wound around the outer periphery of the core.

[0003] Here, after a predetermined time has passed since the resin film was wound around the outer periphery of the core, it protrudes outward in the axial direction or shrinks inward. Due to such width changes in the resin film, a process of cutting a portion of the resin film is required when manufacturing a film roll. Specifically, for example, both ends of the film roll in the axial direction are supported, and the protruding portion is cut off with a cutter or the like while the film roll is rotated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-22905 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there are cases where both axial ends of the film roll are covered with a resin film of varying width, and the resin film becomes wrapped between the support part and the core, which can make it difficult to position the film roll when supporting it.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a film roll manufacturing device that makes it easy to position a film roll when supporting it, and a film roll manufactured by the manufacturing device. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a film roll manufacturing apparatus according to one embodiment of the present disclosure is a film roll manufacturing apparatus that manufactures a film roll having a cylindrical core extending in the axial direction of a central axis and a resin film wound around the outer periphery of the core, and includes two support devices that are arranged on one side and the other side of the axial center of the core and support one end of the axial side and the other end of the core, respectively, and a cutting device that cuts the axial end of the resin film in the film roll supported by the two support devices, each of the two support devices having a main body that is movable in the axial direction and a plurality of support parts that are attached to the main body and are expandable and contractible in a radial direction perpendicular to the central axis relative to the main body, and each of the plurality of support parts has a first part that abuts against an inner circumferential surface of the axial end of the core to support the inner circumferential surface from the inner side, and a second part that extends in the radial direction and abuts against an axial end face of the core to support the end face from the outside in the axial direction. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a film roll manufacturing device that allows easy positioning when supporting a film roll, and a film roll manufactured by the manufacturing device. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic side view of a film roll manufacturing apparatus according to the present embodiment. [Figure 2] FIG. 2 is a perspective view of the support device of this embodiment. [Figure 3]FIG. 3 is a schematic diagram showing an enlarged portion of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a schematic diagram including a film roll manufacturing apparatus and a film roll. [Figure 6] FIG. 6 is a schematic diagram showing the procedure for supporting the film roll with the support device. [Figure 7] FIG. 7 is a schematic diagram showing a change in the position of the core of the film roll relative to the support device. [Figure 8] FIG. 8 is a schematic diagram showing a modified example of the support portion. [Figure 9] FIG. 9 is a schematic diagram showing a procedure for cutting the end portion of the resin film. DETAILED DESCRIPTION OF THE INVENTION

[0010] Modes (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the components described below can be combined as appropriate. Furthermore, parts with the same structure are given the same reference numerals and their explanations will be omitted. Note that in the drawings, the X1 side indicates one side in the axial direction, and the X2 side indicates the other side in the axial direction.

[0011] FIG. 1 is a schematic side view of a film roll manufacturing apparatus according to the present embodiment.

[0012] First, the film roll 6 will be described. The film roll 6 shown in FIG. 1 is used, for example, for plastic film used in packaging food. The film roll 6 includes a winding core 61 and a resin film 62. The winding core 61 extends in the axial direction of the central axis AX. More specifically, the winding core 61 has a cylindrical shape extending in the circumferential direction around the central axis AX. The resin film 62 is wound around the outer periphery of the winding core 61 multiple times.

[0013] Next, we will explain the film roll manufacturing apparatus 100. As shown in Figure 1, the film roll manufacturing apparatus 100 according to this embodiment includes, for example, a first supporting device 2 (supporting device), a second supporting device 2A (supporting device), and a cutting device 5.

[0014] As shown in FIG. 1 , the first support device 2 (support device) is disposed on the X1 side (one axial side) of the first center line CL1. The first center line CL1 is located at the axial center of the two support devices 2 and 2A. The second support device 2A (support device) is disposed on the X2 side (the other axial side) of the first center line CL1. The first support device 2 and the second support device 2A have the same structure but are arranged in opposite directions. That is, the pair of support devices, the first support device 2 and the second support device 2A, support both ends of the film roll 6. Therefore, the following description will focus on the structure of the first support device 2, but the second support device 2A also has the same structure. Note that the term "two support devices" also includes a configuration in which the support devices 2 and 2A are connected and integrated. That is, a configuration in which a device that supports one axial end of the winding core 61 and a device that supports the other axial end of the winding core 61 are included as "two support devices."

[0015] The cutting device 5 includes a cutter 51. The cutter 51 is movable in the up-down, left-right, and front-rear directions. That is, as the film roll 6 supported by the first supporting device 2 and the second supporting device 2A rotates, the cutter 51 moves downward to cut the end of the film roll 6 in the axial direction.

[0016] Fig. 2 is a perspective view of the support device of this embodiment. As shown in Fig. 2, the first support device 2 has a base 33, a main body 3, and a support 4. An air inlet pipe 31 and an air outlet pipe 32 are attached to the base 33. The base 33 is movable in the axial direction. That is, it can move forward and backward to the X1 side and the X2 side.

[0017] As shown in FIG. 2, the main body 3 is attached to the base 33. The main body 3 is movable in the axial direction together with the base 33. The main body 3 rotates relative to the base 33 in a direction about the central axis AX. The main body 3 has a cylindrical outer surface. Specifically, the main body 3 has a cylindrical surface 3a and an end surface 3b. The cylindrical surface 3a extends in the circumferential direction about the central axis AX. The end surface 3b is located at the end of the cylindrical surface 3a on the X2 side. The end surface 3b has a disk shape.

[0018] As shown in FIG. 2, the support portion 4 is attached to the end surface 3b of the main body portion 3. The support portion 4 supports the axial end portion of the winding core 61. For example, three support portions 4 are provided at equal intervals around the circumferential direction of the central axis AX. When air flows in from the air inlet pipe 31, the three support portions 4 expand radially outward. When air flows out from the air outlet pipe 32, the three support portions 4 contract radially inward. In this way, the three support portions 4 are attached to the main body portion 3 and can be expanded and contracted radially relative to the main body portion 3 by air pressure.

[0019] Fig. 3 is a schematic enlarged view of a portion of Fig. 2. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. Fig. 5 is a schematic view including a film roll manufacturing apparatus and a film roll.

[0020] As shown in FIGS. 3 and 4, the support portion 4 includes a first portion 41, a second portion 42, a third portion 43, a fourth portion 44, and a vertical wall portion 46.

[0021] The first portion 41 moves radially outward and comes into contact with an inner circumferential surface 612 of the end portion 611 of the winding core 61, thereby supporting the inner circumferential surface 612 from the inner circumferential side. When the first portion 41 comes into contact with the inner circumferential surface 612, the radius of curvature of the outer circumferential surface of the first portion 41 is set to be the same as the radius of curvature of the inner circumferential surface 612.

[0022] When the inner circumferential surface 612 of the winding core 61 is placed on the surface of the first portion 41, the first portion 41 may be provided with an anti-slip surface to the extent that it does not hinder axial movement of the support part 4. There are no particular limitations on the method for providing the anti-slip surface, but specific examples include providing the surface with irregularities or grooves, or coating it with rubber, elastomer, or the like.

[0023] The second portion 42 extends in a radial direction perpendicular to the central axis AX. The second portion 42 moves radially outward to come into contact with an end face 613 of the end portion 611 of the winding core 61, supporting the end face 613 from the outside in the axial direction. That is, as shown in Fig. 5, the axial length of the winding core 61 is set to be the same as the axial distance between the second portion 42 of the first supporting device 2 and the second portion 42 of the second supporting device 2A.

[0024] 3 and 4, the third portion 43 may have any shape in a cross section including the central axis AX, and may be formed in an arc or a straight line. For example, as shown in Fig. 4, the third portion 43 may be curved in an arc shape so as to extend toward the X1 side as it goes upward in Fig. 4. Furthermore, the arc shape or the arc shape is not limited to a portion of a perfect circle, and may also include a curved surface that is curved along an arc shape.

[0025] The fourth region 44 extends outward in the axial direction from the outer end of the third region 43. An uneven portion 45 is provided at the intersection of the first region 41 and the second region 42. The uneven portion 45 has repeated unevenness in the radial direction. The uneven portion 45 bites into the end of the winding core 61, thereby suppressing circumferential slippage of the winding core 61 relative to the support portion 4 when the film roll 6 is rotated. The vertical wall portion 46 extends outward in the radial direction from the outer end of the fourth region 44 in the axial direction.

[0026] 5, the second center line CL2 is the axial center of the winding core 61. In FIG. 5, the second center line CL2 coincides with the first center line CL1. The resin film 62 has a film main body portion 62a and a protruding portion 62b. The film main body portion 62a is a portion of the resin film 62 that overlaps with the winding core 61 when viewed from the radial direction, and the protruding portion 62b is a portion that protrudes axially outward from the winding core 61 when viewed from the radial direction. After the resin film 62 is wound around the outer periphery of the winding core 61 and a predetermined time has passed, residual stress in the resin film 62 may cause the resin film 62 to protrude axially outward from the winding core 61, in which case the protruding portion 62b is formed.

[0027] 5, the third center line CL3 is the axial center of the resin film 62. When the protruding portion 62b of the resin film 62 on the X1 side has a longer axial length than the protruding portion 62b on the X2 side, the third center line CL3 is positioned on the X1 side by a deviation amount G from the first center line CL1 and the second center line CL2.

[0028] Next, the procedure for supporting the winding core 61 with the support devices 2, 2A will be described. Fig. 6 is a schematic diagram showing the procedure for supporting the film roll with the support devices. Fig. 7 is a schematic diagram showing the change in the position of the winding core of the film roll relative to the support devices.

[0029] First, in a first step P1 in Fig. 6, the film roll 6 is placed between the first supporting device 2 and the second supporting device 2A. Next, in a second step P2, the first supporting device 2 and the second supporting device 2A are each moved in the direction D1 indicated by the arrow. Here, the fourth portion 44 of the supporting part 4 is positioned on the inner peripheral side of the inner peripheral surface 62c of the protruding part 62b. Then, in a third step P3, the supporting part 4 is moved radially outward in the direction D2 indicated by the arrow (expanded in diameter).

[0030] Here, if the third process P3 is broken down further, as shown in FIG. 7, the third process P3 includes a 3-1 process P31, a 3-2 process P32, a 3-3 process P33, and a 3-4 process P34.

[0031] In a 3-1 step P31, the axial end of the inner circumferential surface 612 of the winding core 61 is placed on the third region 43. In a 3-2 step P32, the winding core 61 moves downward while the axial end of the inner circumferential surface 612 of the winding core 61 slides on the surface of the third region 43. In a 3-3 step P33, the winding core 61 moves downward while the end face 613 of the winding core 61 follows the surface of the second region 42. In a 3-4 step P34, the winding core 61 moves further downward, and the inner circumferential surface 612 of the winding core 61 is placed on the surface of the first region 41. At this time, the axial end of the inner circumferential surface 612 of the winding core 61 is flattened by the uneven portion 45.

[0032] 6, in fourth step P4, the first supporting device 2 and the second supporting device 2A are each moved in the direction D3 indicated by the arrow. The fourth step P4 is performed so that the axial end of the inner circumferential surface 612 of the winding core 61 is crushed by the concave-convex portion 45 even if the axial length of the winding core 61 varies during manufacturing and is shorter than the specified length.

[0033] Fig. 8 is a schematic diagram showing a modified example of the support part. Fig. 8 shows a support part 4A. The support part 4A differs from the support part 4 shown in Fig. 4 in a third portion 43A. Specifically, as shown in Fig. 8, the third portion 43A of the support part 4A may be a linear tapered surface in a cross section including the central axis AX. This linear tapered surface extends radially inward in the axial direction toward the X2 side. In other words, it is a tapered surface whose diameter becomes smaller toward the X2 side.

[0034] Fig. 9 is a schematic diagram showing the procedure for cutting the end of the resin film. After the core 61 is supported by the support devices 2 and 2A in the process of Fig. 6, the support part 4 and the film roll 6 supported by the support part 4 are rotated while the cutter 51 of the cutting device 5 cuts the resin film 62. In detail, the cutter 51 is gradually lowered to cut the axial end 62e of the resin film 62 from the film main body 62a, and then the cutter 51 is moved outward in the axial direction to separate the scrap 62d from the film main body 62a.

[0035] As described above, the film roll manufacturing apparatus 100 according to this embodiment includes a first supporting device (supporting device) 2, a second supporting device (supporting device) 2A, and a cutting device 5. Each of the two supporting devices 2, 2A has a main body 3 that is movable in the axial direction and a plurality of supporting portions 4 that are expandable and contractible in the radial direction. Each of the plurality of supporting portions 4 has a first portion 41 and a second portion 42. The first portion 41 has a second portion 42 that extends radially and abuts against an end face 613 of the winding core 61 in the axial direction, supporting the end face 613 from the outside in the axial direction.

[0036] As mentioned above, there are cases where both axial ends of the film roll are covered with a resin film of varying width, and the resin film becomes wrapped between the support part and the core, which can make it difficult to position the film roll when supporting it.

[0037] In this embodiment, the support portion 4 has a first portion 41 that supports the inner peripheral surface 612 of the winding core 61 from the inner peripheral side, and a second portion 42 that supports the end surface 613 of the winding core 61 from the outside in the axial direction.

[0038] Because the support part 4 is expandable and contractible in the radial direction, the first part 41 can position the winding core 61 in the radial direction. Moreover, because the main body part 3 and the support part 4 are movable in the axial direction, the second part 42 can position the winding core 61 in the axial direction. As described above, the film roll 6 can be positioned more easily and with high accuracy. Note that, according to this embodiment, even when the resin film 62 shown in FIG. 6 has a protruding part 62b, the support part 4 can position the winding core 61 in the axial direction.

[0039] Each of the multiple support portions 4 has a third portion 43. The third portion 43 curves from the radially outer end of the second portion 42 so as to move away from the end surface 613 of the winding core 61 as it moves radially outward.

[0040] According to this, when the end of the inner circumferential surface 612 in the axial direction of the winding core 61 of the film roll 6 is placed on the third portion 43, the end of the inner circumferential surface 612 moves relatively inward in the radial direction so as to slide on the surface of the third portion 43. Then, the inner circumferential surface 612 of the winding core 61 abuts against the surface of the first portion 41. In this way, the curved third portion 43 acts as a guide that moves the winding core 61 relatively inward in the radial direction.

[0041] The third portion 43 has an arc shape in a cross section including the central axis AX. This allows the winding core 61 to move radially inward relative to the third portion 43 more smoothly.

[0042] The plurality of support parts 4 are provided in groups of three at equal intervals along the circumferential direction. This allows for more accurate radial positioning of the winding core 61 than in a configuration in which the plurality of support parts 4 are arranged at non-equidistant intervals along the circumferential direction. [Explanation of symbols]

[0043] 2. First support device (support device) 2A Second support device (support device) 3 Main body 3a Cylindrical surface 3b End face 31 Air inlet pipe 32 Air outlet pipe 33 Base 4, 4A support part 41 Part 1 42 Part 2 43, 43A 3rd part 44 Part 4 45 Uneven part 46 Vertical wall section 5 Cutting device 51 Cutter 6 film rolls 61 Core 611 End 612 Inner surface 613 End face 62 Resin film 62a Film body 62b Protruding part 62c Inner surface 62d Scrap wood 62e Axial end 100 Film roll manufacturing equipment AX center axis CL1 First Central Line CL2 Second Central Line CL3 Third Central Line G deviation amount

Claims

1. A film roll manufacturing apparatus that manufactures a film roll having a cylindrical core extending in an axial direction of a central axis and a resin film wound around an outer periphery of the core, two support devices disposed on one side and the other side of a center of the winding core in the axial direction, and supporting an end portion of the winding core on one side and an end portion of the winding core on the other side in the axial direction, respectively; a cutting device that cuts an end portion of the resin film in the axial direction of the film roll supported by the two supporting devices, Each of the two support devices is a main body portion movable in the axial direction; a plurality of support parts attached to the main body part and expandable and contractible in a radial direction perpendicular to the central axis relative to the main body part; Each of the plurality of support portions is a first portion that abuts against an inner circumferential surface of the end portion in the axial direction of the core and supports the inner circumferential surface from the inner circumferential side; a second portion extending in the radial direction and abutting against an end surface of the winding core in the axial direction to support the end surface from the outside in the axial direction; Film roll manufacturing equipment.

2. An uneven portion is provided at an intersection between the first portion and the second portion. The film roll manufacturing apparatus according to claim 1 .

3. Each of the plurality of support portions is a third portion that curves from a radially outer end of the second portion to move away from the end surface of the winding core as it goes radially outward, The film roll manufacturing apparatus according to claim 1 or 2.

4. The plurality of support portions are provided at equal intervals along the circumferential direction of the central axis. The film roll manufacturing apparatus according to claim 3 .

5. A film roll manufactured by the film roll manufacturing apparatus according to claim 1 or 2.

Images