JP2017019575A - Winding core and winding method of web material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding core and a winding method of a web material in which cushioning material sheets can be reliably and easily pasted to a joint without a gap even when an outer diameter of a winding core body varies.SOLUTION: A winding core for winding a web material comprises a cylindrical winding core body 20 and a cushioning material sheet 10 pasted on an outer peripheral surface of the winding core body. The cushioning material sheet is pasted on the outer peripheral surface of the winding core body over the entire circumference while a first cushioning material sheet 11 and a second cushioning material sheet 12 are joined in a circumferential direction of the winding core body. At least one of the joints between the first cushioning material sheet and the second cushioning material sheet is inclined with respect to an axial direction of the winding core body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a winding core for winding a web material and a winding method for winding a web material on a winding core.

  In order to wind up a web material such as a film or a sheet in a roll shape, a method is generally used in which the tip of the web material is fixed to the outer peripheral surface of a cylindrical core with an adhesive or the like, and then the core is rotated and wound. It has been.

  By the way, since the surface of the core is generally hard, when a web material having plasticity is wound into a roll, a step is generated between the outer peripheral surface of the core and the winding end of the web material. An irreversible deformation occurs due to the level difference in the web material wound around. And since the same deformation is also transferred to the web material wound around the deformed web material, there is a problem that an irreversible step mark such as a distortion occurs in the web material over several to several tens of laps from the beginning of winding. was there. Generation | occurrence | production of such a level | step difference will reduce the flatness of a web material, and has become a cause of a product loss and cost increase.

  In order to reduce the occurrence of such step marks, Patent Document 1 discloses a technique of providing a buffer layer on the outer peripheral surface of the core. According to this technique, since the step by the thickness of a web material is relieve | moderated when the winding edge part of a web material sinks in a buffer layer, a level | step difference trace can be reduced.

JP 2005-1624378 A

  As a method of winding the buffer layer around the outer peripheral surface of the core, the buffer material sheet is wound so that the seam is parallel to the axial direction of the core, or the seam is spirally formed on the surface of the core. There is a way to wrap around.

  By the way, when winding the web material around the core, since the shaft is inserted into the hollow portion of the core and the shaft is rotated, the inner diameter tolerance of the core is very small (for example, the inner diameter). The inner diameter tolerance of the specification of the 3-inch (76.2 mm) core is regulated to ± 0.2 to 0.3 mm). On the other hand, the outer diameter tolerance of the core is not particularly restricted, and therefore, the outer diameter of the core varies in size. Therefore, when the cushioning material sheet is wound so that the joint is parallel to the axial direction of the core, the ends of the cushioning material sheet may overlap each other or a gap may be formed at the joint. When the web material is wound around the winding core in such a state, there is a problem that a distortion or the like due to the overlap of the cushioning material sheet or the gap is newly generated in the web material.

  On the other hand, when the buffer material sheet is wound so that the seam is spirally formed on the surface of the winding core, the above-mentioned problems are rarely caused. Since the winding angle (for example, the winding angle) is set to be constant, if there are large variations in the outer diameter or thickness of the winding core, an overlap or a gap may occur in the spiral seam. When the web material is wound around the winding core in such a state, there is a problem that a distortion or the like due to the overlap of the cushioning material sheet or the gap is newly generated in the web material. Moreover, when winding up automatically, since the installation of an expensive automatic winding machine is required, there exists a problem of leading to a cost increase.

  By the way, when winding the web material around the core around which the cushioning material sheet is wound, by sticking an adhesive tape on the surface of the cushioning material sheet, by sticking the end of the web material to the adhesive tape, and fixing it, The web material is wound on the core.

  For example, the core from which the web material is wound may be used for winding the web material again after the web material is unwound from the core at the shipping destination (recycle use). At this time, since the adhesive tape which has fixed the edge part of the web material has weak adhesiveness, it is necessary to peel off the adhesive tape once and paste a new adhesive tape on the buffer material sheet. However, when the pressure-sensitive adhesive tape is peeled off from the buffer material sheet, the surface of the buffer material sheet may be damaged, or a residue of the pressure-sensitive adhesive tape that cannot be removed may be generated. If the web material is wound in a state where the surface of the cushioning material sheet is damaged, the web material may be deformed due to the damage of the surface of the cushioning material sheet or the like. In this case, since it is necessary to peel off the buffer material sheet and wind a new buffer material sheet around the core, there is a problem that the material cost increases.

  The present invention has been made in view of the above problems, and its main object is to reliably and easily paste the cushioning material sheet without gaps even if the outer diameter of the core body varies. It is providing the winding method of a winding core and a web material.

  Another object of the present invention is to easily replace the cushioning sheet when the adhesive tape for fixing the web material stuck on the cushioning sheet is damaged when the core is recycled and used. Another object of the present invention is to provide a winding method for a winding core and a web material that can be performed at low cost.

  A winding core according to the present invention is a winding core for winding a web material, and includes a cylindrical winding core body and a cushioning material sheet attached to the outer peripheral surface of the winding core body. The first cushioning material sheet and the second cushioning material sheet are joined together in the circumferential direction of the core body, and are adhered to the outer peripheral surface of the core body over the entire circumference. At least one of the joint between the sheet and the second cushioning material sheet is inclined with respect to the axial direction of the core body.

  The web material winding method according to the present invention is a winding method for winding a web material around a core, and a step of attaching a cushioning material sheet to the outer peripheral surface of a cylindrical core body over the entire circumference. And a step of adhering the end of the web material on the cushioning material sheet, and a step of winding the web material around the core body, the step of pasting the cushioning material sheet in the circumferential direction of the core body, Including a step of affixing the first buffer material sheet and a step of affixing the second buffer material sheet together with the first buffer material sheet, the first buffer material sheet and the second buffer material sheet At least one of the joints is inclined with respect to the axial direction of the core body.

  According to the present invention, even if the outer diameter of the core body varies, the cushioning material sheet can be reliably and easily attached to the seam without a gap.

  Furthermore, according to the present invention, when the core is recycled and used, the cushioning material sheet can be easily and inexpensively replaced.

It is the figure which showed typically the structure of the shock absorbing material sheet affixed on the outer peripheral surface of the core in one Embodiment of this invention. It is the figure which showed typically the structure of the shock absorbing material sheet affixed on the outer peripheral surface of the core in one Embodiment of this invention. It is the perspective view which showed typically the process of affixing the 1st and 2nd shock absorbing material sheet | seat on the outer peripheral surface of the core main body in one embodiment of this invention. It is the perspective view which showed typically the process of affixing the 1st and 2nd shock absorbing material sheet | seat on the outer peripheral surface of the core main body in one embodiment of this invention. It is the perspective view which showed typically the process of affixing the 1st and 2nd shock absorbing material sheet | seat on the outer peripheral surface of the core main body in one embodiment of this invention. It is the perspective view which showed typically the process of affixing the 1st and 2nd shock absorbing material sheet | seat on the outer peripheral surface of the core main body in one embodiment of this invention. It is a figure explaining the winding-up method which winds the web material in other embodiment of invention on a winding core. It is a figure explaining the winding-up method which winds the web material in other embodiment of invention on a winding core. It is a figure explaining the winding-up method which winds the web material in other embodiment of invention on a winding core. It is the figure which showed typically the structure of the shock absorbing material sheet affixed on the outer peripheral surface of the core in other embodiment of this invention. It is the figure which showed typically the structure of the shock absorbing material sheet affixed on the outer peripheral surface of the core in other embodiment of this invention. It is the figure which showed typically the structure of the 2nd shock absorbing material sheet in other embodiment of this invention. It is the figure which showed typically the structure of the 2nd shock absorbing material sheet in other embodiment of this invention. It is the figure which showed typically the structure of the 1st and 2nd buffer material sheet in other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment. Moreover, it can change suitably in the range which does not deviate from the range which has the effect of this invention.

  FIG. 1A and FIG. 1B are diagrams schematically showing a configuration of a cushioning material sheet attached to the outer peripheral surface of the core in one embodiment of the present invention.

  As shown in FIG. 1A, the cushioning material sheet in the present embodiment is a combination of a trapezoidal first cushioning material sheet 11 and a wedge-shaped second cushioning material sheet 12. FIG. 1B is a diagram in which the first cushioning material sheet 11 and the second cushioning material sheet 12 are separately arranged.

  As shown in FIG. 1B, the first cushioning material sheet 11 has a pair of bottom sides 11a and 11b having a trapezoidal shape perpendicular to the axial direction Y of the core body (not shown). In addition, the second cushioning material sheet 12 has a pair of oblique sides 12c and 12d in a wedge shape having the same inclination angle as the pair of oblique sides 11c and 11d of the first cushioning material sheet 11 with respect to the axial direction Y. Yes. That is, the oblique sides 12c and 12d of the second cushioning material sheet 12 are parallel to the oblique sides 11c and 11d of the first cushioning material sheet 11, respectively.

Further, as shown in Figure 1A, when the width in the circumferential direction X of the core body of the first cushioning material sheet 11 and the second buffer material sheet 12, _{respectively,} and W 1, _{W 2, W} 1 + W ₂ is set to be substantially equal to the circumferential length (circumference) of the core body. Further, the height L1 of the _first buffer material sheet 11 is set to be substantially equal to the length in the axial direction Y of the core body. The height L ₂ of the first buffer material sheet 11 is set to be longer than the length in the axial direction Y of the core body (L _{2> L 1).}

  2A to 2C and FIG. 3 schematically illustrate the process of attaching the first and second cushioning material sheets 11 and 12 shown in FIGS. 1A and 1B to the outer peripheral surface of the core body in the present embodiment. It is the shown perspective view.

  First, as shown in FIG. 2A, the first buffer material sheet 11 is attached to the outer peripheral surface of the cylindrical core body 20. At this time, since the width of the first cushioning material sheet 11 is shorter than the circumferential length of the core body 20, the first cushioning material sheet 11 has a predetermined gap 20 a in the circumferential direction of the core body 20. And is attached to the outer peripheral surface of the core body 20. The gap 20a is gradually expanded along the axial direction of the core body 20.

  Next, as shown to FIG. 2B, the 2nd shock absorbing material sheet 12 is affixed on the area | region of the clearance gap 20a. At this time, the second cushioning material sheet 12 can be easily fitted in the region of the gap 20a by sliding in the direction of the arrow A along the outer peripheral surface of the gap 20a. Further, since the oblique sides 12c and 12d of the second cushioning material sheet 12 are parallel to the oblique sides 11c and 11d of the first cushioning material sheet 11, respectively, as shown in FIG. 2C, the first cushioning material Two joints (11c, 12c and 11d, 12d) between the sheet 11 and the second cushioning material sheet 12 can be attached without any gap. Furthermore, even if the outer diameter of the core body 20 varies and the width of the gap 20a changes, the first buffer material can be surely and easily adjusted by adjusting the slide amount of the second buffer material sheet 12. The joint between the sheet 11 and the second cushioning material sheet 12 can be pasted without any gap.

The length L ₂ of the second buffer material sheet 12, since it is set longer than the axial length L ₁ of the core body 20, as shown in Figure 2C, the second buffer material sheet Thus, portions 13 a and 13 b that protrude from the core body 20 are produced at both ends in the axial direction of 12. Therefore, by cutting off the protruding portions 13a and 13b, it is possible to obtain a core in which the cushioning material sheet 10 (11, 12) is attached to the outer peripheral surface of the core body 20 as shown in FIG. .

  Here, the first buffer material sheet 11 and the second buffer material sheet 12 are attached to the core body 20, for example, the surface of the core body 20 or the first buffer material sheet 11 is attached. It can be performed by applying an adhesive or the like to the surface. Or you may affix the 1st shock absorbing material sheet 11 on the surface of the core main body 20 via a double-sided adhesive tape.

  The core for winding the web material in the present embodiment includes a cylindrical core body 20 and a buffer sheet 10 attached to the outer peripheral surface of the core body 20, and the buffer sheet 10 is a core body. The first cushioning material sheet 11 and the second cushioning material sheet 12 are joined together in the circumferential direction of 20, and are adhered to the outer peripheral surface of the core body 20 over the entire circumference. The joint between the cushioning material sheet 11 and the second cushioning material sheet 12 is characterized by being inclined with respect to the axial direction of the core body 20.

  With such a configuration, the seam between the first cushioning material sheet 11 and the second cushioning material sheet 12 can be attached without any gap, and even if the outer diameter of the core body 20 varies, the second cushioning By adjusting the sliding amount of the material sheet 12 in the axial direction, the joint between the first cushioning material sheet 11 and the second cushioning material sheet 12 can be reliably and easily attached without a gap.

  Next, a winding method for winding a web material around another core according to another embodiment of the present invention will be described with reference to FIGS.

  First, as shown in FIG. 4, a core with the cushioning material sheet 10 (11, 12) shown in FIG. 3 attached thereto is prepared, and the adhesive tape 30 is placed on the second cushioning material sheet 12. paste.

  Next, as shown in FIG. 5, the end portion 40 a of the web material 40 is attached to the adhesive tape 30. In FIG. 5, the end portion 40a of the web material 40 is arranged so that the tip portion is on the second cushioning material sheet 12, but is arranged so as to be on the first cushioning material sheet 11B. Also good. Here, FIG. 5 is an enlarged partial sectional view of a part of the outer periphery of the core as viewed from the axial direction of the core.

  Next, as shown in FIG. 6, the web material 40 is wound around the core body 20. Here, FIG. 6 is an enlarged partial cross-sectional view showing a state in which the web members 40A, 40B, and 40C in the first to third turns are wound on the core body 20.

  As shown in FIG. 6, the end portion 40a of the web material 40 is a portion 12A that contacts the web material end portion 40a of the second cushioning material sheet 12 by winding the web materials 40B and 40C after the second round. And the part 11A of the 1st buffer material sheet | seat 11 near the part 12A sinks by the thickness of the web material 40A. Thereby, the level | step difference trace which originates in the level | step difference of the web material edge part 40a can be suppressed.

  For example, after the web material 40 is unwound and used at the shipping destination, the winding core around which the web material 40 is wound is used again for winding the web material 40. At this time, since the adhesive tape 30 that has fixed the web material end 40a has weak adhesiveness, the adhesive tape 30 is once peeled off and a new adhesive tape 30 is placed on the second cushioning material sheet 12. Need to stick. However, when the pressure-sensitive adhesive tape 30 is peeled off from the buffer material sheet, the surface of the buffer material sheet may be damaged. If the web material 40 is wound in a state where the surface of the cushioning material sheet is damaged, the web material 40 may be deformed due to the damage or the like on the surface of the cushioning material sheet. In this case, it is necessary to peel off the buffer material sheet and wind a new buffer material sheet around the core.

  As in the past, a single cushion material sheet is wound by a method in which the seam is parallel to the axial direction of the core, or by a method in which the seam is spirally wound around the surface of the core. When pasting on the main body 20, it is necessary to peel off all the cushioning material sheets and paste a new cushioning material sheet.

  On the other hand, in this embodiment, since the adhesive tape 30 is affixed on the 2nd shock absorbing material sheet 12, it is only necessary to replace the 2nd shock absorbing material sheet 12. FIG. In particular, the second cushioning material sheet 12 has an outer diameter of the core body 20 that varies, and even if the width of the gap 20a changes, the gap between the first cushioning material sheet 11 and the first cushioning material sheet 11 does not occur. Since it is only necessary to have a function of adjusting, the area of the second buffer material sheet 12 can be reduced to the minimum necessary as compared with the first buffer material sheet 11. Accordingly, when the core is recycled and used, the material cost can be greatly reduced as compared with the conventional case.

  In the present embodiment, the cushioning material sheet 10 (11, 12) is not particularly limited as long as it has elasticity or plasticity, and has characteristics that are effective in reducing step marks. For example, as the material of the buffer sheet 10 (11, 12), foamed resin made of polyolefin, polystyrene, polyurethane, or the like, rubber made of acrylic rubber, or the like can be used.

  In the present embodiment, the web material 40 is not particularly limited as long as it is a strip-like long object, and for example, a metal foil, a plastic film, a paper sheet, a cloth sheet, or a laminate of any of these may be used. Can be mentioned.

  The core body 20 is not particularly limited as long as the core body 20 has a strength necessary for winding the web material 40. For example, a material such as paper, resin, or metal can be used. .

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible.

  For example, in the above-described embodiment, the first cushioning material sheet 11 and the second cushioning material sheet 12 have been described by taking the shape as illustrated in FIGS. 1A and 1B as an example. However, the shape is limited to such a shape. Instead, at least one of the joints between the first cushioning material sheet 11 and the second cushioning material sheet 12 may be inclined with respect to the axial direction of the core body 20. For example, the first buffer material sheet 11 and the second buffer material sheet 12 may have shapes as shown in FIGS. 7A and 7B. That is, the first cushioning material sheet 11 is a trapezoid in which the pair of bottom sides 11a and 11b is perpendicular to the axial direction Y of the core body 20, and only one side 11d out of the pair of sides 11c and 11d. The bases 11a and 11b are inclined. Further, the second cushioning material sheet 12 has a wedge shape having a pair of sides 11c and 11d of the first cushioning material sheet 11 and a pair of sides 12c and 12d having the same inclination angle. In the present embodiment, the shape of the second cushioning material sheet 12 is referred to as a “wedge shape”. However, as shown in FIGS. 1B and 7B, the tip of the second cushioning material sheet 12 is not necessarily a sharp shape (triangle). There is no need.

  Moreover, in the said embodiment, although the 1st shock absorbing material sheet 11 and the 2nd shock absorbing material sheet 12 were joined, the shock absorbing material sheet 10 was comprised, but the 1st shock absorbing material sheet 11 and / or the 2nd shock absorbing material were comprised. The material sheet 12 may be composed of a plurality of cushioning material sheets.

  Moreover, in the said embodiment, although the adhesive tape 30 for fixing the edge part 40a of the web material 40 was affixed on the 2nd shock absorbing material sheet 12, it is not limited to this, For example, 2nd As the buffer material sheet 12, a sheet having a sticky surface may be used. Thereby, since the edge part 40a of the web material 40 can be directly affixed and fixed to the shock absorbing material sheet | seat 12, reduction of work cost and material cost can be aimed at.

  As the buffer material sheet 12 having a sticky surface, for example, a material in which an adhesive is formed on the surface of the sheet from an elastic or plastic material can be used. Or you may comprise the buffer material sheet 12 with the material which has plasticity and self-adhesiveness. As such a cushioning material sheet | seat 12, materials, such as an acryl type, a silicone type, a rubber type, an elastomer type, a urethane type, a vinyl type, can be used, for example.

  In addition, although it is preferable to comprise the 1st shock absorbing material sheet 11 and the 2nd shock absorbing material sheet 12 with the same material, you may comprise with another material.

  In the above embodiment, as shown in FIG. 2B, the second cushioning material sheet 12 is slid along the outer peripheral surface of the gap 20a so as to be fitted into the area of the gap 20a. If the surface (rear surface) on the core body 20 side of the material sheet 12 has adhesiveness, it is difficult to smoothly slide the second cushioning material sheet 12. Then, as shown in FIG. 8, if the release film 50 is stuck on the back surface of the 2nd buffer material sheet 12, the 2nd buffer material sheet 12 can be slid smoothly. At this time, it is preferable that the release films 50 be separable from each other along the cut line 51 as shown in FIG. 8A. In this case, first, with the release film 50 attached, the second cushioning material sheet 12 is slid and fitted into the region of the gap 20a, and then the one release film 50a is maintained with the state maintained. The second buffer material sheet 12 of the part is peeled off and fixed to the core body 20, and then the other release film 50b is peeled off, and the second buffer material sheet 12 of the part is cored. Affix to the main body 20. Thereby, even after fitting the 2nd shock absorbing material sheet 12 in the area | region of the clearance gap 20a, the 2nd shock absorbing material sheet 12 can be easily affixed on the core body 20 without raise | generating a position shift. .

  In FIG. 8A, the release film 50 can be separated into two release films 50a and 50b along one cut line 51. For example, as shown in FIG. In addition, two cut lines 51 may be provided. In this case, first, the middle release film 50a is peeled off along the two cut lines 51, and the second cushioning material sheet 12 of the part is attached and fixed to the core body 20, and then the both sides The release film 50b is peeled off, and the second cushioning material sheet 12 of the part can be attached to the core body 20.

  In this embodiment, even if the outer diameter of the core body 20 varies, the seam between the first cushioning material sheet 11 and the second cushioning material sheet 12 can be pasted without any gaps. When the end surfaces of the two cushioning material sheets 11 and 12 are perpendicular to the surface direction of the first and second cushioning material sheets 11 and 12, respectively, a V-shaped groove is formed at the joint. There is a fear. Therefore, as shown in FIG. 9, the end surfaces 14a and 15a of the first and second cushioning material sheets 11 and 12 are inclined with respect to the surface directions of the first and second cushioning material sheets 11 and 12, respectively. Therefore, it is possible to prevent a V-shaped groove from being formed at the joint. At this time, as shown in FIG. 9, the inclination of the second cushioning material sheet 12 and both end faces 15a, 15a is reduced, and the width of the second cushioning material sheet 12 decreases toward the core body 20 side. It is preferable to form it like this. If it does in this way, the 2nd shock absorbing material sheet 12 can be smoothly fitted in the field of gap 20a also from the upper part of gap 20a of the 1st shock absorbing material sheet 11.

10 cushioning material sheet
11 First cushioning material sheet
12 Second cushioning material sheet
20 core body
20a clearance
30 Adhesive tape
40 Web material
50 release film

JP 2005-162478 A

Claims (8)

A winding core for winding web material,
A cylindrical core body,
A cushioning material sheet attached to the outer peripheral surface of the core body,
The cushioning material sheet is bonded to the outer peripheral surface of the core body over the entire circumference by joining the first cushioning material sheet and the second cushioning material sheet in the circumferential direction of the core body. And
The core, wherein at least one of the seams between the first buffer material sheet and the second buffer material sheet is inclined with respect to the axial direction of the core body. The first cushioning material sheet is attached to the outer peripheral surface of the core body with a predetermined gap in the circumferential direction of the core body,
The winding core according to claim 1, wherein the second cushioning material sheet is attached to the gap region. The first cushioning material sheet has a pair of bottoms in a trapezoidal shape perpendicular to the axial direction of the core body,
The winding core according to claim 1, wherein the second cushioning material sheet has a wedge shape having the same inclination angle as a pair of oblique sides of the first cushioning material sheet.   The winding core according to claim 1, wherein the surface of the second cushioning material sheet has adhesiveness. A winding method for winding a web material around a core,
A process of attaching a cushioning material sheet to the outer peripheral surface of the cylindrical core body over the entire circumference;
A step of attaching an end of the web material on the cushioning material sheet;
Winding the web material around the core body,
The step of attaching the cushioning material sheet includes:
A step of attaching a first cushioning material sheet in the circumferential direction of the core body;
Joining the first cushioning material sheet and pasting the second cushioning material sheet,
A web material winding method in which at least one of the seams between the first buffer material sheet and the second buffer material sheet is inclined with respect to the axial direction of the core body. The first cushioning material sheet is attached to the outer peripheral surface of the core body with a predetermined gap in the circumferential direction of the core body,
The web material winding method according to claim 5, wherein the second cushioning material sheet is attached to the region of the gap. The surface of the second cushioning material sheet has adhesiveness,
The web material winding method according to claim 5, wherein an end portion of the web material is stuck on the second cushioning material sheet. Further comprising a step of sticking an adhesive tape on the second cushioning material sheet,
The winding method of the web material according to claim 5, wherein an end portion of the web material is stuck on the adhesive tape.

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