JP2009242059A - Web-like object winding core and web-like object winding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a web-like object winding core capable of restraining a defect of flatness of a web-like object caused by a step height of a part fixed by adhering an end part of the web-like object, and a web-like object winding method for restraining the defect of the flatness of the web-like object. <P>SOLUTION: This core is provided for winding the web-like object. In the web-like object winding core, the core is composed of a cylindrical cover material body and a shock absorbing material wound on an outer peripheral surface of the core material body, and the shock absorbing material is provided with a recessed notch or a groove for dropping a web-like object end part extending in the axial direction of the core, and an angle formed by a side wall surface of the recessed notch or the groove of the shock absorbing material and an outer peripheral surface of the shock absorbing material, is set to 40 degrees to 80 degrees. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a winding core for winding a web-like object such as a strip-like long film or sheet, and a web-like article winding method using the same.

  When winding a strip-like long film or sheet into a cylindrical shape, a general method is to wind the film by rotating the core by adhering and fixing the end of the film to a cylindrical core.

  At that time, if the film is thick or has a material that can be easily plastically deformed, the part where the film ends are bonded and fixed becomes a protrusion, and a step is formed, and the wound film is deformed to transfer traces. May be. In applications that require precise flatness, such as flat panel displays, liquid crystal light control glass, and thin film circuit materials, such transfer marks become defects in appearance and processing, and the film itself and the products that use it are It may cause a decrease in yield.

  As a means for solving such a transfer mark, a method of absorbing the step by sinking the film end to the core side is considered. Specifically, the surface of the film is made softer than the film and the film end is It is conceivable that the core has a structure in which the surface of the core is secured or a place where the film end is dropped is secured on the surface of the core.

  For example, as means for softening the surface of the core, the surface of the core is covered with a cushioning material (see Patent Document 1 and Patent Document 2), or a flexible sheet is added to the film edge (see Patent Document 3). ) Has been proposed. However, in these methods, the end portion of the film may not sink completely on the surface of the core, and a trace of a step may remain. Particularly, in the case of a film having a thickness of 100 μm or more, the influence is remarkable and may not be improved. Further, if the buffer material is made too soft in order to sufficiently sink the film end, winding tightening may occur, and the film in the core may buckle and become wrinkled.

  In addition, as another method for securing a place where the film edge is dropped on the surface of the core, a method of providing a step by making a gradually shallow cut on the surface of the core (see Patent Document 4 and Patent Document 5) is proposed. ing. However, this proposal has a certain effect, but the effect of the corners of the edge that are not machined diagonally may be large, leaving traces of steps, and increasing the cost of oblique machining, which is insufficient. It is.

  Separately, a method of making a groove in the core by adjusting the dimensions of the embossing and cushioning material (see Patent Document 6) has been proposed. However, in this method, the notch or the step of the groove itself may affect the film, and a clearer core trace may be generated. In Patent Document 6, as a further countermeasure, a method of chamfering the upper portion of the groove or giving a curvature is proposed, but this time the processing becomes complicated and the cost increases, which is not industrially suitable.

Although any of the above methods can achieve a certain level of effect, the impact of the imprint on the edge of the film is still not sufficient, and with recent precision processing and development of applications, these measures are insufficient. A case has occurred.
Japanese Patent Laid-Open No. 63-041382 Japanese Patent No. 3964892 JP 2004-217349 A JP-A-11-263537 JP 2007-119230 A JP 2000-318930 A

  Accordingly, an object of the present invention is to provide a web-like material winding capable of suppressing a defect in flatness of the web-like material caused by a step in a portion where the end portions of the web-like material such as a film or a sheet are bonded and fixed. It is to provide a take-up core.

  Another object of the present invention is to provide a method for winding a web-like material in which the above-described web-like material winding core is suppressed by using the web-like material winding core. .

  The present invention uses the following means in order to solve these problems.

  A winding core for winding a web-like material according to the present invention is a winding core for winding a web-like material, and the winding core is wound around a cylindrical core material body and an outer peripheral surface of the core material body. The buffer material is provided with a concave notch or groove for dropping the end of the web-like object extending in the length direction (axial direction) of the core, and the buffer material has a concave notch or The web-like material winding core is characterized in that an angle formed between the side wall surface of the groove and the outer peripheral surface of the cushioning material is 40 to 80 degrees.

  According to a preferred aspect of the web-like material winding core of the present invention, the end of the web-like material is fixed in the concave cut or groove of the cushioning material, preferably on the bottom of the concave cut or groove. Adhesive material is dropped and buried.

  According to the preferable aspect of the web-like material winding core of the present invention, the cut or groove is further configured to be covered with a tape having a thickness of 6 μm to 50 μm.

  The web-like material winding method of the present invention includes a cylindrical core material body and a buffer material wound around the outer peripheral surface of the core material body, and the buffer material has a length of the core. A concave notch or groove for dropping the end of the web-like object extending in the direction (axial direction) is provided, and the end of the web-like object is fixed in the concave notch or groove of the cushioning material. The core for winding a web-like material, in which the adhesive material is dropped and embedded, and the angle formed between the concave notch of the buffer material or the side wall surface of the groove and the outer peripheral surface of the buffer material is 45 degrees to 75 degrees When winding the web-like object using, the end of the web-like object is dropped into the concave cut or groove of the cushioning material, and the end of the web-like object is fixed with the adhesive material embedded in the concave cut or groove, Furthermore, the concave notch or groove is 6 mm thick. The web-like material is formed by winding the web-like material in a state in which a step due to the web-like material edge is not substantially formed after covering with a tape of m to 50 μm. This is a winding method.

  According to the winding core for web-like material of the present invention, it is possible to obtain a roll-like web-like material having no deformation such as unevenness and image distortion transferred due to a step at the end of the web-like material such as a film. it can. As described above, according to the present invention, it is possible to suppress the loss of the web-like material due to the deformation caused by the step at the end of the web-like material, and it is possible to obtain the web-like material with less deformation at an appropriate cost. Further, by using a web-like material without such deformation, it is possible to suppress appearance defects and processing defects such as flat panel displays, liquid crystal light control glass, and thin film circuit materials.

  The winding core for winding a web-like material of the present invention comprises a cylindrical core material body and a buffer material wound around the outer peripheral surface of the core material body, and the buffer material has a length direction of the core ( A concave notch or groove for dropping the end of the web-like object extending in the axial direction is provided, and the side wall surface of the concave notch or groove of the cushioning material and the outer peripheral surface of the cushioning material are 40 degrees to 80 degrees. It has a degree angle.

  FIG. 1 is a partial cross-sectional view showing an embodiment of a winding core for winding a web-like object of the present invention. Moreover, FIG. 2 is sectional drawing which illustrates the state which wound the web-like thing around the winding core for web-like thing of this invention.

  As shown in FIGS. 1 and 2, the winding core for winding a web-like material according to the present invention has a configuration in which a buffer material 2 is wound around the outer peripheral surface of a cylindrical core material body 1, and a buffer layer is provided. A concave cut or groove is provided in a part of the buffer layer. This concave cut or groove is provided in the length direction (axial direction) of the core.

  It is desirable that the cylindrical core body 1 has a strength necessary for winding the web-like object 3. The material constituting the core body 1 includes, in addition to paper, resins such as ABS resin, vinyl chloride resin, ester resin, polycarbonate resin, polyamide resin, and styrene resin, glass fiber, and carbon fiber. Further, various reinforced plastic materials reinforced with reinforcing fibers such as aramid fibers, metals and alloys such as iron, aluminum and stainless steel, and composites thereof are preferably used.

  The core body 1 is preferably a cylindrical body mainly composed of a resin or a metal from the viewpoint of dust resistance and dimensional stability. However, depending on the application, it may be a resin on paper depending on the cost of manufacturing, recovery and disposal. It may be a cylindrical body (paper tube) made of a composite material impregnated with. Examples of commercially available products that satisfy the above requirements include “FWP Core” (registered trademark) manufactured by Tenryu Kogyo Co., Ltd. as a composite resin, and “M Core manufactured by Showa Marutsu Co., Ltd. as a paper tube impregnated with resin. Is a specific example.

  The dimensions of the core body 1 are appropriately selected according to the length and thickness of the web-like material, the tension during winding, the length is about 0.3 to 3 m, the inner diameter is about 5 to 30 cm, and the wall thickness is 5 to 30 mm. Although the degree is preferably used, specifically, one having a length of about 1 m, an inner diameter of about 15 cm, and a thickness of about 12 mm is more preferably used.

  The buffer layer is formed by winding and sticking an elastic sheet-like material around the outer peripheral surface of the core body 1 as the buffer material 2. Examples of the material constituting the sheet-like material used as the cushioning material 2 include elastic bodies such as various rubbers, easy molding materials such as nonwoven fabrics, felts and synthetic leathers, polyethylene resins, polypropylene resins and polystyrene resins. A foamed resin and a composite thereof are preferably used.

  In addition, as to how to wrap the buffer material 2, a method of wrapping the core material body 1 so as to cover the core material body 1 with a sheet-shaped buffer material 2 having the same length as the outer periphery of the cylindrical core material body 1, Although there is a method of winding the cushioning material 2 around the core material body 1 in a spiral manner, the cushioning material 2 is not limited as long as the sheet-like cushioning material 2 is chamfered so as not to cause unevenness due to the seam. . The thickness of the cushioning material needs to be thicker than the web-like material to be wound, but if it is too thick, the cost increases, and wrinkles due to winding tightening occur. Preferably it is about 0.7-2 mm, and the thing around 1 mm is used especially preferably.

  On the contrary, if the resilience of the cushioning material 2 is too strong, the step at the end of the web-like material is pressed against the web-like material that has been wound.

  When the material of the buffer material is made of a foamed resin, it is preferable that the compressive stress (measured according to JIS K6767) at a strain of 25% is 30 to 250 kPa. Examples of commercially available products that satisfy the above requirements include, for example, “Toraypef” (registered trademark) manufactured by Toray Industries, Inc. as foamed polyolefin resin, and “Minafoam” (registered trademark) manufactured by Sakai Chemical Industry Co., Ltd. as expanded polyethylene resin. Examples include “Literon” manufactured by Sekisui Polymertech Co., Ltd.

  As shown in FIG. 1 and FIG. 2, it is important to provide the buffer material 2 with a concave cut or groove as a place where the end of the web-like object and the adhesive material 5 that fixes the end of the web-like material are dropped. .

  There are methods for creating a concave cut or groove, such as embossing or using a cutting jig whose cutting edge has the same shape as the concave cut or groove cross section. A method of cutting and deleting the buffer material 2 by fixing the straight blade using a jig that can be set is a desirable method that is inexpensive in terms of apparatus and work.

  A concave notch with respect to the outer peripheral surface of the core or the (groove) angle α (see FIG. 2) of the side wall surface of the groove is 40 to 80 degrees, preferably 45 to 75 degrees. When the angle is at a right angle or close to it, a flatness defect occurs just as when the end of the web-like object is placed due to the corner formed by the outer peripheral surface of the core and the concave notch or the side surface of the groove wall. . On the other hand, if the angle is too shallow, the end of the web-like object cannot be sufficiently dropped into the concave cut or groove, and the core trace is generated.

  The concave cut or groove is provided in the length direction (axial direction) of the core as described above. A plurality of concave cuts or grooves may exist in one winding core, but only one is sufficient for practical use. The concave notch or groove has an inverted trapezoidal shape when viewed from the cross-sectional direction, and its width may be appropriately selected depending on the diameter of the core and the material and thickness of the take-up web. The width of the base of the trapezoid is preferably 15 to 30 mm. The width of the upper side of the inverted trapezoid is naturally determined by the width of the bottom side and the angle α of the side wall surface of the groove. Further, the depth of the concave notch or groove does not need to reach the surface of the core body if it is deeper than the thickness of the web-like material to be wound, but it reaches the surface of the core body from the viewpoint of processing. Is preferred.

  Patent Document 6 described above describes an example in which a part of a corner (corner) formed by the surface of the core and the groove wall surface is cut and chamfered or cut into an arc shape, but the processing becomes complicated. This increases the cost and is not industrially suitable. Further, in this document, only the corner in the winding direction is referred to. However, as a result of examination, the corner opposite to the winding direction also causes poor planarity. It is preferable that the angle is a predetermined angle.

  Moreover, in this invention, although the adhesive material 5 can be used in order to fix a web-like thing edge part to a core, when an adhesive material is used, the core trace resulting from the thickness of this adhesive material 5 will generate | occur | produce. Therefore, it is desirable that the adhesive material 5 is also cut or dropped into the groove. In order to drop the adhesive 5 into the concave cut or groove, it is desirable that the width of the cut or groove is the same as or wider than the width of the adhesive. If the width of the concave notch or groove is narrow, the adhesive material may protrude from the notch or groove and cause a core mark.

  It is desired that the width of the adhesive material 5 is a width that is necessary and sufficient to obtain an adhesive force that can sufficiently withstand the tension when the web-like object 3 is wound up, and depending on the combination of the adhesive material and the material constituting the core. It is determined appropriately. If the width of the adhesive material 5 is too narrow, sufficient adhesive force cannot be obtained, and if it is too wide, the cost of the adhesive material increases. For example, when the width of the cut or groove is 20 mm, an adhesive material having a width of 19 mm is preferably used. In addition, if the thickness of the adhesive material 5 is too thick, the adhesive material protrudes from the concave cut or groove and causes a core trace. Therefore, it is desired that the thickness of the adhesive material is as thin as possible, and the web-like material to be wound is taken up. It must be thinner than the thickness of the cushioning material even if it is combined with the thickness of. Therefore, the thickness of the adhesive material is preferably 2 to 10 μm. The adhesive material 5 is preferably embedded in the bottom of the concave cut or groove.

  Adhesive materials include viscoelastic polymers such as rubber polymers, acrylic polymers, silicon polymers, vinyl ether polymers and urethane polymers, and tackifying resins such as rosin resins and petroleum resin resins as required. And an adhesive material containing a softener and a crosslinking agent. The adhesive material may be applied in a solid or liquid state to the core or / and the end of the web-like material. However, in terms of ease of handling, the double-sided adhesive tape provided with an adhesive layer on both sides is used. It is preferably provided in the form. A method of forming and transferring an adhesive material layer on a tape having releasability is also suitable for forming a thin adhesive material layer.

  When the web-like object 3 is wound around the core, a radial force is applied to the web-like object 3 at the core portion by the tension when the web-like object 3 is wound. At this time, the concave notch with the web-shaped object end portion dropped or the web-like material wound around the groove may also drop, and a trace due to the concave notch or groove may occur.

  As a result of earnestly examining the method for preventing this, the present inventors have found that a method of covering the concave notch or groove and the end of the web-like object dropped into the concave notch or groove with the tape 4 such as an adhesive tape is inexpensive and We found it to be effective enough. The tape 4 such as this adhesive tape needs to have a width enough to cover the cut or groove, but if the width is too wide, the cost increases. It is possible to select appropriately according to the dimensions of. Similarly to the adhesive material, if the tape 4 is too thick, it may cause a core trace, so that it is desired to be as thin as possible. However, if the tape 4 is too thin, it is difficult to prevent the web-like object 3 from falling. Since there is a problem in terms of property and ease of handling, the tape is preferably 6 μm to 50 μm in thickness, and more preferably 8 μm to 25 μm in thickness.

  The web-like material winding method of the present invention can be suitably performed using the above-described web-like material winding core.

  The winding of the web-like material of the present invention is a winding core for winding the web-like material, and the winding core is formed of a cylindrical core material body and a cushioning material wound around the outer peripheral surface of the core material body. The cushioning material is provided with a concave notch or groove for dropping the end of the web-like object extending in the length direction (axial direction) of the winding core. The adhesive material for fixing the end of the web-like object is dropped and embedded, and the angle between the concave notch of the buffer material or the side wall surface of the groove and the outer peripheral surface of the buffer material is 40 degrees to A web-like winding core that is 80 degrees, preferably 45 to 75 degrees can be suitably used.

  Specifically, in the present invention, when the web-like material is wound using the above-described web-like material winding core, the web-like material end is dropped into the concave cut or groove of the cushioning material. The part is fixed with a concave notch or an adhesive embedded in the groove, and the concave notch or groove is covered with a tape having a thickness of 6 μm to 50 μm, and then the web-like object starts to be wound. In this state, the web-like material is wound up in a roll shape in a state where the step due to the above is not substantially formed.

  As described above, by using the web-shaped material winding core of the present invention, a roll-shaped web-shaped material roll having no deformation such as unevenness and image distortion transferred due to a step at the end of the web-shaped material ( Alternatively, a web-like product or web-roll product) can be obtained.

  In the present invention, the web-like material is a strip-like long material, and specifically includes a film-like material such as a plastic film, and a sheet-like material such as foil, paper, and fabric. The thickness of the web-like material used in the present invention is preferably in the range of 1 μm to 1 mm.

  The core for winding a web-like material of the present invention is used for applications requiring precise flatness such as flat panel displays, liquid crystal light control glass and thin film circuit materials, surface antireflection treatment films, and photographic glossy prints. It is suitable for winding up a film-like material used in applications where appearance defects such as paper are conspicuous.

  Embodiments of the present invention will be described below with reference to examples, but the present invention is not limited to these examples. Evaluation methods in the examples of the present invention are as follows.

<Evaluation method 1>
The prepared PET (polyethylene terephthalate) film having a thickness of 175 micrometers was rewound after 24 hours had passed after winding 250 m at a tension of 15 kg around the cores described in Examples 1 to 4 and Comparative Examples 1 to 5 below. . Illumination was performed using a straight tube fluorescent lamp at a point 50 m from the winding core, and the distortion of the reflected image of the straight tube fluorescent lamp reflected on the film surface was visually observed. The observed results were classified as ◎ if there was no distortion, Δ if slightly recognized, and x if distortion was observed, ◎ was accepted, and Δ and x were rejected.

<Evaluation method 2>
The prepared 175-micrometer-thick PET (polyethylene terephthalate) film is wound twice around the cores of Examples 1 to 4 and Comparative Examples 1 to 5 with a tension of 15 kg, and then the second finger to the fourth finger. The part which touched the edge part of a film with a finger pad of No. was traced from the top, and how to feel unevenness was palpated. Those that did not feel any irregularities were classified as ◎, those that felt slight irregularities △, those that felt irregularities were classified as ×, ◎ was accepted, and Δ and × were rejected.

[Example 1]
A plastic resin impregnated paper tube "M Core" made by Showa Maru Co., Ltd. with a width of 1200 mm, an inner diameter of 6 inches, and a wall thickness of 12 mm is made of Toray Co., Ltd. made of Toray Co. Affixed with a series adhesive material, and after creating a single groove with a width of 1mm and 20mm in depth, remove the wall surface of the groove so that the (groove) angle is 75 degrees. A web-like winding core was obtained. Further, a thin double-sided tape “No. 465” made of Sumitomo 3M Co., Ltd. having a width of 19 mm was applied to the bottom of the groove, and the end of the PET film was fixed as shown in FIG. Further, as shown in FIG. 2, a polyester adhesive tape “No. 31B” made by Nitto Denko Corporation having a thickness of 12 μm and a width of 25 mm was attached so as to cover the entire groove, and a PET (polyethylene terephthalate) film was wound up.

[Example 2]
In Example 1, a core for winding a web-like object was obtained in the same manner as in Example 1 except that the (groove) angle was 60 degrees.

[Example 3]
In Example 1, it implemented like Example 1 except having changed the (groove) angle into 45 degrees, and wound up PET film.

[Comparative Example 1]
In Example 1, a groove was not created in the cushioning material, and the same process as in Example 1 was performed except that the film end was fixed to an adhesive material adhered in the axial direction of the core. I took it.

[Comparative Example 2]
In Example 1, the (groove) angle was set to a right angle (90 degrees), and a PET film was wound up in the same manner as in Example 1 except that the polyester adhesive tape was not used.

[Comparative Example 3]
In Example 1, the buffer material 2 on the core material body 1 is formed with a groove that gradually becomes shallow as shown in FIG. 3, and the angle (corner) opposite to the winding direction remains at a right angle (90 degrees). The PET film was wound up in the same manner as in Example 1 except that the polyester adhesive tape was not used.

[Comparative Example 4]
In Example 1, a groove having a right angle (90 degrees) is formed, and the corner in the winding direction is chamfered so that the cross section becomes an arc, and the angle (corner) opposite to the winding direction is a right angle. The PET film was wound up in the same manner as in Example 1 except that the polyester adhesive tape was not used.

  The evaluation results of Examples 1 to 4 and Comparative Examples 1 to 4 are collectively shown in Table 1 below.

  As shown in Table 1, all of the PET films obtained in Comparative Examples 1 to 4 were distorted in the reflected images of the illumination lamps and felt unevenness by palpation. On the other hand, in the PET films obtained in Examples 1 to 4, there is no distortion in the reflected image of the illuminating lamp by visual observation, and there is no unevenness in palpation, and a PET film with good flatness can be obtained. did it.

FIG. 1 is a partial cross-sectional view showing an embodiment of a winding core for winding a web-like object of the present invention. FIG. 2 is a cross-sectional view illustrating a state in which a web-like material is wound around the web-like material winding core of the present invention. 3 is a partial cross-sectional view showing an embodiment of a winding core for winding a web-like material of Comparative Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical core material body 2 Buffer material 3 Web-like thing 4 Tape-like thing 5 Adhesive material alpha (groove) angle

Claims (6)

  A winding core for winding a web-like material, wherein the winding core is composed of a cylindrical core material body and a buffer material wound around an outer peripheral surface of the core material body, and the buffer material has a length of the core. A concave cut or groove for dropping the end of the web-like object extending in the vertical direction (axial direction) is provided, and the angle formed by the concave cut or groove side wall surface of the cushioning material and the outer peripheral surface of the cushioning material Is a winding core for winding a web-like material, wherein the core is 40 to 80 degrees.   The core for winding a web-like object according to claim 1, wherein an adhesive for fixing the end of the web-like object is dropped and embedded in a concave cut or groove of the cushioning material.   The core for winding a web-like object according to claim 2, wherein the adhesive material is embedded in the bottom of the concave cut or groove.   The core for winding a web-like object according to any one of claims 1 to 3, wherein the incision or groove is covered with a tape having a thickness of 6 µm to 50 µm.   A web-like product winding body in which the web-like product winding core according to any one of claims 1 to 4 is used.   The winding core comprises a cylindrical core material body and a buffer material wound around the outer peripheral surface of the core material body, and the buffer material has a web-like object end extending in the length direction (axial direction) of the core. A concave notch or groove for dropping is provided, and an adhesive for fixing the end of the web-like object is dropped and embedded in the concave notch or groove of the cushioning material; and When winding a web-like object using a winding core for winding the web-like object, the angle formed by the concave notch of the cushioning material or the side wall surface of the groove and the outer peripheral surface of the cushioning material is 45 degrees to 75 degrees, The end of the web-like object is dropped into a concave notch or groove of the material, and the end of the web-like object is fixed with an adhesive material embedded in the concave notch or groove, and the concave notch or groove part has a thickness of 6 μm to 50 μm. Cover with tape and then web The web-like material is wound up in a roll shape in a state where a step due to the end of the web-like material is not substantially formed.

Images