JP6363001B2 - Lamination body winding method and winding roll - Google Patents

Description

  The present invention relates to a winding method for a laminated body in which a laminated body formed by laminating a plurality of belt-like long webs is wound around a cylindrical winding core, and a winding roll in which the laminated body is wound into a cylindrical shape. .

  For example, Patent Document 1 discloses a method of winding a belt-like long web such as a plastic film or a plastic sheet around a cylindrical core. In this, a cushioning material is wound around the outer peripheral surface of the core, and the web is wound after the end portion of the web is dropped and fixed in a groove provided in the cushioning material.

  In this case, the web edge is located in the groove, and a step due to the web edge does not occur on the outer peripheral surface of the cushioning material. However, the pressing force due to the winding and the reaction force are concentrated on the portion of the web that is in contact with the edge portion of the groove, and as a result, a core mark is generated. This core mark is also transferred to the portion of the second and subsequent webs wound thereon. In particular, in the case of a web for an optical system such as a light diffusion film, such a core mark is easily noticeable, and it is necessary to suppress the generation of the core mark in order to improve the yield. Further, the cushioning material is a very soft material, and it is necessary to have a very advanced technique to accurately create the groove so as to have a specific angle. Therefore, in the prior application (Japanese Patent Application No. 2014-226300), the present applicant formed a cut in the cushioning material along the edge of the web fixed to the outer circumferential surface of the cushioning material wound around the outer circumferential surface of the core. Later, a web winding method for winding the web was proposed. According to this, the level | step difference by the edge part of a web reduces and the generation | occurrence | production of a core mark can be suppressed because the edge part of a web sinks into a buffering material along a cut.

  By the way, when a laminated body such as an adhesive film for optical use formed by laminating a plurality of webs is wound around a cylindrical core, the occurrence of core marks is sufficiently suppressed even when the above-described winding method is used. There are things that cannot be done. This is because, in the winding method of the prior application, since the end portions of all the webs constituting the laminate are fixed to the cushioning material at one place, the thickness of each web due to the increased thickness compared to the single layer web. Due to the fact that a large bounce force, which is the sum of the bounce forces generated at the end of each web due to rigidity, is generated at one location, and this bounce force acts on the second and subsequent laminates wound on it. It is thought to do.

JP 2009-242059 A

  In view of the above points, the present invention can suppress the occurrence of core marks by suppressing the jumping at the end of the laminate, and can take up the laminate that does not require a particularly advanced technique for implementation. It is an object to provide a method and a winding roll.

  In order to solve the above problems, a method for winding a laminate of the present invention, in which a laminate formed by laminating a plurality of strip-like long webs around a cylindrical core, is provided by a plurality of webs constituting the laminate. Are wound into a plurality of groups in the stacking order from the web located on the innermost circumference to the web located on the outermost circumference at the time of winding, and the cushioning material is wound around the outer circumferential surface of the core, and each group of the laminate is wrapped around the outer circumferential surface of the cushioning material The end of the web is fixed in a different position so that the group on the outer circumferential side is located on the winding rotation direction side, and the cushioning material is aligned with the end of the web of each group for each group. The laminated body is wound after the cuts are formed at different positions.

  In order to solve the above problems, a cylindrical winding core, a cushioning material wound around the outer circumferential surface of the winding core, and a plurality of belt-like and long webs wound around the outer circumferential surface of the cushioning material are laminated. The winding roll of the present invention comprising a laminate is assembled into a plurality of groups in the order of lamination from the web located on the innermost circumference to the web located on the outermost circumference during winding of the plurality of webs constituting the laminate, The end of the web of each group of the laminate is fixed to the outer peripheral surface of the material with the position being different for each group so that the outer peripheral group is located on the winding rotation direction side, and the buffer material of each group It is characterized in that the cut is formed by changing the position for each group along the edge of the web.

  According to the present invention, in order to form incisions along the end portions of the webs of a plurality of groups constituting the laminated body in the cushioning material, when winding the laminated body, the end portions of the webs of each group follow the respective incisions. As a result, it sinks into the cushioning material and the level difference due to the edge of the web is reduced. Moreover, since the end portions of the webs of the plurality of groups are fixed to the laminate at different positions for each group, the jumping force at the web end portions of the plurality of groups is generated at different positions to form the laminate. The jumping force generated at the web end of each group is smaller than the jumping force that occurs when all the web ends are fixed to the cushioning material at one location, and the occurrence of core marks can be suppressed. . Moreover, when implementing this invention, a high processing precision and processing technique are not required.

(A)-(c) is a figure explaining the winding method of the laminated body of embodiment of this invention. The figure explaining the winding method of the laminated body of embodiment of this invention. The enlarged view of the A section of FIG.

  Hereinafter, with reference to the drawings, the laminate L is formed by laminating three strip-like long webs W1, W2, W3, and the laminate L is fed out from a feed roll outside the figure while being cylindrical. Taking the case of winding around the core 1 as an example, a method for winding a laminate according to an embodiment of the present invention will be described. As the webs W1, W2, and W3, plastic films, paper, metal foil, adhesive sheets, and the like can be used. The plastic film used for the web can be exemplified by a polymer resin used for the core material of the double-sided adhesive tape described later, and the adhesive sheet used for the web is laminated with the adhesive used for the double-sided adhesive tape described later on the plastic film or paper. Can be illustrated.

  First, as shown in FIG. 1A, the buffer material 2 is wound around the outer peripheral surface of the core 1. The core 1 preferably has a strength necessary for winding the laminate L. For example, paper (including paper impregnated with resin (described later)), rubber, acrylonitrile / butadiene / styrene resin , Resins such as polycarbonate resin and vinyl chloride resin, various reinforced plastic materials reinforced with reinforcing fibers such as glass fiber, carbon fiber and aramid fiber, and metals and alloys such as iron, aluminum, copper and stainless steel, Moreover, it can comprise with those composites. Examples of the resin impregnated in the paper include phenol resin, epoxy resin, styrene resin, urethane resin, acrylic resin, polyester resin, melamine resin, and the like. The dimensions of the core 1 are appropriately selected depending on the length and thickness of the laminate L, the tension during winding, and the like. For example, the length of the core 1 corresponding to the width of the laminate L is 0.005 m to 5 m. The inner diameter can be set in the range of 0.5 cm to 50 cm, and the wall thickness can be set in the range of 1 mm to 50 mm.

  The buffer material 2 is, for example, an elastic body such as various rubbers, an easily molded material such as a nonwoven fabric, felt, and synthetic leather, a foamed resin made of a polyethylene resin, a polypropylene resin, a polyurethane resin, a polystyrene resin, and the like, and It can be composed of such a complex. As for the method of winding the cushioning material 2, a method of wrapping the core 1 so as to cover the core 1 with a sheet-like cushioning material 2 having the same length as the outer periphery of the core 1 as shown in the drawing is generally used. The cushioning material 2 may be wound around the winding core 1 in a spiral shape. The thickness of the buffer material 2 can be set, for example, in the range of 0.2 mm to 50 mm, preferably in the range of 0.5 mm to 20 mm, and more preferably in the range of 0.7 mm to 10 mm. When the buffer material 2 is made of a foamed resin, it preferably has a resilience such that a compressive stress (measured according to JIS K6767) at a strain of 25% is 10 to 250 kPa. For fixing the buffer material 2 to the core 1, a well-known double-sided pressure-sensitive adhesive sheet (not shown) (for example, an acrylic resin-based pressure-sensitive adhesive sheet) or the like can be used.

  Further, in the present embodiment, the first group G1 including the web W1 positioned on the innermost periphery and the web W2 positioned on the outer peripheral side when the three webs W1, W2, and W3 constituting the laminated body L are wound up. They are grouped into a second group G2 consisting of the web W3 located on the outermost periphery. Then, as shown in FIGS. 1 (a) and 1 (b), a pressure-sensitive adhesive sheet (core fixing tape) 3 is affixed to an arbitrary position on the outer peripheral surface of the cushioning material 2, and the end of the laminate L is more than this pressure-sensitive adhesive sheet 3 Is extended to the winding rotation direction side (the direction indicated by the arrow in the figure), and the end portions of the webs W1, W2 of the first group G1 are fixed to the cushioning material 2 via the adhesive sheet 3. As the pressure-sensitive adhesive sheet 3, for example, a double-sided pressure-sensitive adhesive tape whose pressure-sensitive adhesive surface is exposed can be used. Examples of the double-sided pressure-sensitive adhesive tape include those in which a pressure-sensitive adhesive layer is provided on both sides of the core material and those having only a pressure-sensitive adhesive layer without a core material. From the viewpoint of reducing the level difference of the web W due to the pressure-sensitive adhesive sheet 3, it is preferable to use one without a core material. If necessary, a plurality of pressure-sensitive adhesive layers may be laminated, or other functional layers may be laminated. Examples of the pressure-sensitive adhesive include acrylic, rubber-based, silicone-based, polyester-based, urethane-based, and epoxy-based adhesives. These may be appropriately selected and used alone or in combination. The thickness of the adhesive layer is not particularly limited, but is preferably as thin as possible, specifically 0.5 to 300 μm, more preferably 1 to 100 μm, and particularly preferably 1.5 to 50 μm. If it is less than 0.5 μm, the adhesive strength may be insufficient, and the ends of the webs W1, W2 may not be firmly fixed, or it may be difficult to obtain a uniform coating. If it exceeds 300 μm, there may be a problem such as an increase in cost due to a slow production rate at the time of film formation, or sticking of the adhesive to the webs W1 and W2 due to the protrusion of the adhesive from the coating cross section. . The core material may be selected from paper, nonwoven fabric, sheet-like rubber, sheet-like polymer resin, metal foil such as aluminum or copper, etc., and used as a single layer or laminated. Examples of the polymer resin used for the core material include polyethylene resin, polypropylene resin, styrene resin, acrylic resin, and polyester resin.

  Next, as shown in FIG.1 (b), the web W3 of the 2nd group G2 was turned up to the opposite side of the winding rotation direction, and the web W1 of the 1st group G1 which protruded from the adhesive sheet 3 in this state A blade B of a cutter (not shown) is inserted into the front end portion of W2 so as to enter the cushioning material 2 from the surface of the web W2. Thereby, while the front-end | tip part of the webs W1 and W2 of the 1st group G1 is cut | disconnected, the notch 21 along the edge part of the webs W1 and W2 is formed in the shock absorbing material 2. FIG. Thereafter, the cut ends W1o and W2o ahead of the cut portions of the webs W1 and W2 are removed.

  Next, as shown in FIG. 1C, the pressure-sensitive adhesive sheet 4 is pasted on the outer peripheral surface of the cushioning material 2 on the winding rotation direction side from the notch 21, and the tip of the web W <b> 3 of the second group G <b> 2 rather than the pressure-sensitive adhesive sheet 4. The end of the web W3 is fixed to the cushioning material 2 via the pressure-sensitive adhesive sheet 4 so as to protrude. Thereby, the edge part of the web W3 of the 2nd group G2 is fixed so that it may be located in the winding rotation direction side rather than the edge part of the webs W1 and W2 of the 1st group G1. Then, the blade B is inserted so as to enter the cushioning material 2 at the leading end portion of the web W <b> 3 protruding from the adhesive sheet 4. Thereby, the front-end | tip part of the web W3 is cut | disconnected, and the notch 22 which follows the edge part of the web W3 in the position different from the said notch 21 of the buffer material 2 with this is formed. Thereafter, the cut end W3o ahead of the cut portion of the web W is removed. The length of the tip portion of the web W3 after cutting / removal (the portion protruding from the side edge of the pressure-sensitive adhesive sheet 4) is preferably shorter, specifically 10 mm or less, more preferably 5 mm or less, and particularly preferably 3 mm or less. Preferably, it is most preferable not to protrude from the side edge of the pressure-sensitive adhesive sheet 4. If the length of the part protruding from the side edge of the pressure-sensitive adhesive sheet 4 is long, the end of the web W3 is not fixed, so the end of the laminate L is wound when the second round L is wound. When the thickness of the web W3 (G2) is thick, there is stiffness, and a repulsive force in the direction toward the outer periphery is generated at the end portion, which may cause extra core marks. .

  Note that the depths of the cuts 21 and 22 may reach the core 1, and reach the core 1 as long as the end of the web can sink when the laminate L described later is wound. It does not have to be. In this case, the depth of the cut 22 can be made smaller than the cut 21. Specifically, even if the depth of the cut 21 is less than the total thickness (hereinafter referred to as “thickness T1”) obtained by adding the thicknesses of the webs W1 and W2 and the adhesive sheet 3, the ends of the webs W1 and W2 sink. However, the depth is preferably not less than the thickness T1, and is preferably 1.1 times, 1.3 times, 1.5 times the thickness T1, or the like. Similarly, the depth of the notch 22 is preferably a depth equal to or greater than the total thickness of the web W3 and the pressure-sensitive adhesive sheet 4 (hereinafter referred to as “thickness T2”), 1.1 times the thickness T2. The depth is preferably 1.3 times or 1.5 times. The cuts 21 and 22 may be formed without cutting the webs W1, W2, and W3 by inserting the blades B into the cushioning material 2 along the edges of the webs W1, W2, and W3. Moreover, the thing similar to the said adhesive sheet 3 can be used for the adhesive sheet 4. FIG.

  Next, as shown in FIG. 2, the laminate L is wound up at a predetermined speed and tension. The winding speed can be set in the range of 1 m / min to 500 m / min, for example, and the tension can be set in the range of 1 to 1000 N / m (per width of 1 m), for example. When winding the laminated body L, as shown in an enlarged view in FIG. 3, the second and third rounds and the laminated body L are wound, whereby the inner side of the winding roll R (that is, toward the core 1). The end portions of the webs W1, W2 of the first group G1 sink into the cushioning material 2 along the cuts 21 due to internal stress generated in the direction). At the same time, the end portion of the web W3 of the second group G2 sinks into the cushioning material 2 along the cuts 22. For this reason, in the obtained winding roll R, the level | step difference by the edge part of web W1, W2, W3 is reduced.

  Further, in order to fix the end portions of the webs W1, W2 of the first group G1 and the end portions of the web W3 of the second group G2 to the cushioning material 2 at different positions, both the first and second groups G1, G2 The jumping force at the end of the web is generated in a distributed manner at different positions. Therefore, the webs of the first and second groups G1 and G2 are compared with the jumping force generated when the end portions of all the webs W1 to W3 constituting the laminated body L are fixed to the cushioning material 2 at one place. The jumping force generated at the end is reduced. In addition, there is no edge portion of the groove where the pressing force due to winding and the reaction force concentrate. Therefore, the generation of core marks can be suppressed.

  Next, in order to confirm the effect of the present invention, the following experiment was performed. In this experiment, as the laminated body L, a web W1 which is a release film, a web W2 which is a pressure-sensitive adhesive layer without a core material, and a web W3 which is a release film are laminated in this order ("Opteria" manufactured by Lintec Corporation). (Registered trademark) "MO-T015) was used. The webs W1 and W2 constituting the laminate L were grouped into a group G1, and the web W3 was grouped into a group G2. The core 1 is made of acrylonitrile, butadiene, styrene resin (ABS resin) having an inner diameter of 6 inches and a thickness of 8 mm, and the outer periphery of the core 1 is foamed with a thickness of 1 mm (5 mm compressed product) as a buffer material 2. A urethane sheet (Sekisui urethane processed “urethane foam 33H compressed product”) was wound. An acrylic pressure-sensitive adhesive sheet 3 having a length of 300 mm, a thickness of 5 μm, and a width of 10 mm without a core material was pasted over the entire width of the core 1 of the buffer material 2. Affixed so that the tip portion of the laminate L protrudes about 100 mm from the side edge of the pressure-sensitive adhesive sheet 3, peels off the web W3 as the group G2 from the web W2 and turns it up in the direction opposite to the winding rotation direction, The blade edge of the cutter W is inserted so that the edge of the adhesive sheet 3 protrudes from the side edge of the adhesive sheet 3 by about 2 mm from the surface of the web W2 to the cushioning material 2 and reaches the outer peripheral surface of the core 1, and the webs W1, W2 A cut 21 was formed in the cushioning material 2 at the same time as cutting the tip portion. By removing the cut ends W1o and W2o of the webs W1 and W2, cuts 21 were formed in the cushioning material 2 along the ends of the web W. Furthermore, the adhesive sheet 4 similar to the said adhesive sheet 3 was stuck on the outer peripheral surface of the shock absorbing material 2 of the winding rotation direction side rather than the notch | incision 21. FIG. The tip of the web W3 is stuck and fixed so that it protrudes about 50 mm from the side edge of the pressure-sensitive adhesive sheet 4, and the blade edge extends from the surface of the web W3 to the cushioning material 2 at a location where it protrudes from the side edge of the pressure-sensitive adhesive sheet 4. The blade B of the cutter was inserted so as to reach the outer peripheral surface of the core 1 and the leading end portion of the web W3 was cut. By removing the cut end W3o of the web W3, a cut 22 was formed in the cushioning material 2 along the end of the web W3. Then, the laminate L was wound up by 50 m at a tension of 200 N / m and a speed of 5 m / min. The winding roll thus obtained is referred to as “Example 1”.

  Moreover, the winding roll obtained by the method similar to the said Example 1 except the point which made the thickness of the urethane foam 33H 2 mm (10 mm compression goods) and 3 mm (15 mm compression goods) "Example 2", " Example 3 ”was designated. Except for the point of using “PORON (registered trademark) MS-40P” manufactured by Inoac and “PORON (registered trademark) SR-S-40P” manufactured by Inoac, which are urethane foam sheets, as the cushioning material 2, the above Example 1 Winding rolls obtained by the same method as in Example 4 were designated as “Example 4” and “Example 5”, respectively.

  For comparison with Examples 1 to 5, the following comparative experiment was performed. In the comparative experiment, a winding roll obtained by winding the laminate L directly on the winding core 1 without winding the buffer material 2 under the same winding conditions as in Example 1 was referred to as “Comparative Example 1”. Moreover, the said Example 3 and 4 except the point which did not group the web which comprises the laminated body L in the shock absorbing material 2, and formed only one cut along the edge part which united web W1, W2, W3. , 5 were taken as “Comparative Example 2”, “Comparative Example 3”, and “Comparative Example 4”, respectively.

  Next, the winding rolls of Examples 1 to 5 and Comparative Examples 1 to 4 were evaluated. Immediately after obtaining the take-up roll, the evaluation method is to roll back at a tension of 30 N / m and a speed of 5 m / min, visually check for the presence or absence of the core trace, and from the end of the laminate L to the position where the core trace is confirmed. Table 1 shows the maximum distance of “NGm”. According to Table 1, by forming two cuts 21 and 22 in the cushioning material 2, the number of NGm compared to the case where no cut is formed or one cut along the end of the laminate L is formed. It has been found that it can be shortened, that is, the generation of core marks can be suppressed.

  In this experiment, the tension at the time of winding was set to 200 N / m so that the “NGm number” of Examples 1 to 5 and Comparative Examples 1 to 4 can be easily compared. By appropriately setting the tension, it is possible to further suppress the generation of core marks.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the laminated body L composed of the three-layer webs W1, W2, and W3 is wound up is described as an example, but the web is composed of at least two layers (including the case of four or more layers). The present invention can be applied to the case where the laminated body to be wound is wound.

  Moreover, in the said embodiment, when forming the cut | notch 21 in the shock absorbing material 2, although the front-end | tip part of web W1, W2 which protruded rather than the adhesive sheet 3 is cut | disconnected, it is adhere | attached within the width | variety of the adhesive sheet 3. FIG. It is also possible to cut the webs W1 and W2. Similarly, it is also possible to cut the portion of the web W3 bonded within the width of the adhesive sheet 4. However, in this case, the adhesive remains on the peripheral surface portion of the cushioning material 2 from which the cut end W3o of the web W3 has been peeled off, and the adhesive adheres to the portion of the laminate L that is wound on the adhesive. The above embodiment is more advantageous because it becomes unusable. However, when the adhesive sheet 4 that is cut at the same time when the cut end W3o of the web W3 is peeled off is used, it is possible to solve the problem that the adhesive remains.

  Moreover, in the said embodiment, after fixing the edge part of web W1, W2 to the shock absorbing material 2, the cut | notch 21 is formed in the shock absorbing material 2 along the edge part of the web W1, W2. After forming the cuts 21, the ends of the webs W <b> 1 and W <b> 2 may be fixed along the cuts 21. However, in this case, a troublesome work for the operator of positioning the ends of the webs W1, W2 with respect to the notch 21 is necessary. On the other hand, according to the above-described embodiment, such alignment is unnecessary, and workability is improved.

  Moreover, although the case where the webs W1 and W2 are grouped into the group G1 and the web W3 into the group G2 has been described as an example in the above embodiment, the webs W1 and W2 may be grouped into different groups. In this case, a cut along the end of the web W2 is formed at a position shifted to the winding rotation direction side from the cut 21 along the end of the web W1, and the web W3 is shifted to a position shifted toward the winding rotation direction side. A notch along the edge is formed. According to this, the jumping force at the end of the web W1 and the jumping force at the end of the web W2 can be dispersed. In the present invention, “along the ends of the webs (W1, W2, W3)” includes not only the same position as the web edge but also a position slightly separated from the web edge. This “slight” means about 1 to 3 mm.

  L ... Laminated body, W1, W2, W3 ... Web, G1 ... First group, G2 ... Second group, 1 ... Core, 2 ... Buffer material, 21,22 ... Cut.

Claims (2)

In a winding method of a laminate in which a laminate formed by laminating a plurality of belt-like long webs is wound around a cylindrical core,
Assembling a plurality of webs constituting the laminated body into a plurality of groups in the order of lamination from the web located at the innermost circumference to the web located at the outermost circumference at the time of winding,
A buffer material is wound around the outer peripheral surface of the core, and the end of the web of each group of the laminated body is positioned on the outer peripheral surface of the buffer material so that the group on the outer peripheral side is positioned closer to the winding rotation direction. And winding the laminate after forming the cuts in the buffer material along the edge of each group so that the position is different for each group. Method. In a winding roll comprising a cylindrical winding core, a cushioning material wound around the outer circumferential surface of the winding core, and a laminated body formed by laminating a plurality of belt-like long webs wound around the outer circumferential surface of the cushioning material,
A plurality of webs constituting the laminate are grouped into a plurality of groups in the order of lamination from the web located on the innermost circumference to the web located on the outermost circumference at the time of winding,
Each group of the laminated body is fixed to the outer peripheral surface of the cushioning material with different positions so that the end of the web of each group of the laminated body is located on the winding rotation direction side as the outer peripheral group is located. The winding roll characterized by the notch | incision being formed by changing a position for every group so that the edge part of this web may be followed.

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