JP5764359B2 - Web core - Google Patents

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JP5764359B2
JP5764359B2 JP2011068881A JP2011068881A JP5764359B2 JP 5764359 B2 JP5764359 B2 JP 5764359B2 JP 2011068881 A JP2011068881 A JP 2011068881A JP 2011068881 A JP2011068881 A JP 2011068881A JP 5764359 B2 JP5764359 B2 JP 5764359B2
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web
core
outer shell
inner shell
connecting portion
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JP2012201471A (en
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石川 廉
廉 石川
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Fujifilm Corp
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Description

本発明は、紙、ポリエステルフィルム、金属薄板等の支持体(以下、ウェブという)の表面に、塗布、表面処理等を施し巻き取る装置及びそのような支持体を単体で巻き取る装置に装填するウェブ用の巻芯に関する。   In the present invention, a device for winding up a surface of a support (hereinafter referred to as a web) such as paper, a polyester film, and a metal sheet by coating, surface treatment and the like, and a device for winding such a support alone are loaded. The present invention relates to a web core.

ウェブに塗布、又は表面処理等を施した製品は、産業上広く用いられており、これらの製品は写真感光材料、磁気記録材料のように、高価な材料を使用したものが多く、製品の歩留りの向上が強く求められている。   Products that have been coated or surface-treated on the web are widely used in industry, and many of these products use expensive materials such as photographic photosensitive materials and magnetic recording materials. Improvement is strongly demanded.

特許文献1には、製造工程において支持体ロールの変形を防止するため、巻芯外径と、支持体の巻長と、巻芯の円周方向の線膨張係数との関係を規定することが記載されている。   In Patent Document 1, in order to prevent deformation of the support roll in the manufacturing process, the relationship between the outer diameter of the core, the winding length of the support, and the linear expansion coefficient in the circumferential direction of the core can be specified. Have been described.

特許文献2には、経時或は繰り返しの使用によっても復元力が失われないように、円筒状の母材の外周に、クッション層と、プリプレッグ材を用いた保護層とを積層させた構成のウェブ用の巻芯の構成が記載されている。   Patent Document 2 has a structure in which a cushion layer and a protective layer using a prepreg material are laminated on the outer periphery of a cylindrical base material so that the restoring force is not lost even when used over time or repeatedly. The configuration of a web core is described.

特開2006−73047号公報JP 2006-73047 A 特開平6−206668号公報JP-A-6-206668

しかし、ウェブ用の巻芯において、工程、輸送などの環境変化に対して巻芯が熱膨張すると、巻き取ったウェブに過度な面圧がかかり、品質面で故障になる場合がある。また、巻芯におけるウェブを巻き取る面を構成する筒状のシェル部は適度な肉厚がないと巻き締まり変形によって、巻取製品の品質故障につながる。   However, in the web core, when the core is thermally expanded due to environmental changes such as process and transportation, an excessive surface pressure is applied to the wound web, which may cause a failure in quality. Moreover, if the cylindrical shell part which comprises the surface which winds up the web in a winding core does not have moderate thickness, it will lead to the quality failure of winding products by winding tightening deformation.

これらを解決するために特許文献1に示すような高弾性率かつ寸法変化をコントロール可能な材料を用いた巻芯が望ましいが、シェル部の肉厚が厚いため、材料費の高い材料を用いる場合は巻芯のコストも嵩んでしまう。   In order to solve these problems, a winding core using a material having a high elastic modulus and controllable dimensional change as shown in Patent Document 1 is desirable. However, since the shell portion is thick, a material with a high material cost is used. Increases the cost of the core.

本発明は、上記事情に鑑みてなされたもので、その目的は、巻き取ったウェブの面圧の影響を抑えることができ、かつ巻芯のコストの増加を抑えることができるウェブ用の巻芯を提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a web core capable of suppressing the influence of the surface pressure of the wound web and suppressing an increase in the cost of the core. Is to provide.

本発明のウェブ用の巻芯は、円筒形状の胴部を有し、
前記胴部が、内側シェルと、前記内側シェルの外周を囲う外側シェルとを含み、
前記内側シェルと前記外側シェルとを連結する連結部と、を備えるウェブ用の巻芯であって、
前記連結部は、前記内側シェル及び前記外側シェルの間で、かつ前記胴部の軸方向の両端部にのみ設けられ、
前記連結部の材料は、前記内側シェルを構成する材料よりも弾性率が小さい材料であり、
前記内側シェルと前記外側シェルとの間における前記両端部以外の領域の全体に隙間が形成されている。
The web core of the present invention has a cylindrical body,
The trunk includes an inner shell and an outer shell surrounding an outer periphery of the inner shell;
A web winding core comprising: a connecting portion that connects the inner shell and the outer shell;
The connecting portion is provided only between the inner shell and the outer shell and at both ends in the axial direction of the trunk portion,
The material of the connecting portion is a material having a smaller elastic modulus than the material constituting the inner shell,
A gap is formed in the entire region other than the both end portions between the inner shell and the outer shell.

本発明によれば、巻き取ったウェブの面圧の影響を抑えることができ、かつ巻芯のコストの増加を抑えることができるウェブ用の巻芯を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the core for webs which can suppress the influence of the surface pressure of the wound web and can suppress the increase in the cost of a core can be provided.

本発明の巻芯を模式的に示す斜視図The perspective view which shows the core of this invention typically 図1の巻芯のII−II線方向にみた断面図1 is a cross-sectional view of the core of FIG. 本発明の巻芯と通常の巻芯とのウェブ巻き取り時の変形の状態を説明する図である。It is a figure explaining the state of a deformation | transformation at the time of web winding of the winding core of this invention, and a normal winding core. ウェブ巻き取り時にウェブ自身にかかる面圧の大きさと幅方向の位置との関係を模式的に示すグラフA graph schematically showing the relationship between the surface pressure applied to the web itself and the position in the width direction during web winding 図1の巻芯の変形例を説明する模式的な図Schematic diagram illustrating a modified example of the core of FIG.

以下、本発明の実施形態を図面に基づいて詳しく説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図1は、本発明の巻芯を模式的に示す斜視図である。図2は、図1の巻芯のII−II線方向にみた断面図である。   FIG. 1 is a perspective view schematically showing the core of the present invention. FIG. 2 is a cross-sectional view of the core of FIG. 1 as viewed in the II-II line direction.

巻芯1は、ウェブWを巻き取ることに用いられるものである。ウェブWは、例えば、紙、ポリエステルフィルム、金属薄板等の支持体であるが、特に限定されない。   The core 1 is used for winding the web W. The web W is a support such as paper, a polyester film, and a metal thin plate, but is not particularly limited.

巻芯1は、円筒形状の胴部2を有する。胴部2は、内側シェル11と、外側シェル21とを含む。   The winding core 1 has a cylindrical body 2. The trunk portion 2 includes an inner shell 11 and an outer shell 21.

内側シェル11は、円柱形状をなし、円筒部12と、軸方向の両端に端面13とを有する。   The inner shell 11 has a cylindrical shape, and has a cylindrical portion 12 and end faces 13 at both ends in the axial direction.

端面13のそれぞれには、軸14が一体に設けられている。軸14は、図示しない巻取装置における回転軸受部に固定される。内側シェル11は、各軸14を中心として回転可能に支持される。なお、この軸14の軸方向(図1において左右の方向)を、以下では単に軸方向ともいう。また、この軸方向は、巻芯1に巻き取られるウェブWの幅方向と同じ方向である。   A shaft 14 is integrally provided on each of the end faces 13. The shaft 14 is fixed to a rotary bearing portion in a winding device (not shown). The inner shell 11 is supported so as to be rotatable about each axis 14. Note that the axial direction of the shaft 14 (the left-right direction in FIG. 1) is also simply referred to as an axial direction below. The axial direction is the same as the width direction of the web W wound around the core 1.

外側シェルは、円筒部22によって構成されている。円筒部22は、内側シェル11の円筒部12の外周側に設けられている。内側シェル11の円筒部12と外側シェル21の円筒部22との間には、両者を連結する連結部31が設けられている。   The outer shell is constituted by the cylindrical portion 22. The cylindrical portion 22 is provided on the outer peripheral side of the cylindrical portion 12 of the inner shell 11. A connecting portion 31 is provided between the cylindrical portion 12 of the inner shell 11 and the cylindrical portion 22 of the outer shell 21 to connect the two.

連結部31は、内側シェル11及び外側シェル21の間において、胴部2の軸方向に対して両端部にのみ設けられている。連結部31は、胴部2の軸方向において、ウェブWが巻き取られる領域よりも外側に位置していることが好ましい。こうすれば、ウェブWを巻き取ったときに生じる巻芯1の変形が、より均一になり、ウェブWにシワなどの故障が生じにくくなる。   The connecting portions 31 are provided only at both ends with respect to the axial direction of the body portion 2 between the inner shell 11 and the outer shell 21. It is preferable that the connection part 31 is located outside the area | region where the web W is wound up in the axial direction of the trunk | drum 2. As shown in FIG. In this way, the deformation of the core 1 that occurs when the web W is wound becomes more uniform, and the web W is less likely to be damaged such as wrinkles.

円筒部12の外周面と外側シェル21の円筒部22の内周面との間において、胴部2の軸方向に対して両端部以外の領域には隙間gが存在する。   Between the outer peripheral surface of the cylindrical portion 12 and the inner peripheral surface of the cylindrical portion 22 of the outer shell 21, there is a gap g in a region other than both end portions with respect to the axial direction of the body portion 2.

次に、内側シェル11、外側シェル21、及び連結部31の材料について説明する。   Next, the material of the inner shell 11, the outer shell 21, and the connecting portion 31 will be described.

内側シェル11の材料は、ウェブを巻き取る際にかかる面圧に耐えられる範囲であれば特に限定されず、例えば、アルミニウム等の金属である。内側シェル11の材料は、剛性が高いものを用いる。   The material of the inner shell 11 is not particularly limited as long as it can withstand the surface pressure applied when the web is wound, and is, for example, a metal such as aluminum. As the material of the inner shell 11, a material having high rigidity is used.

外側シェル21の材料は、カーボンファイバ(CFRP)などの線膨張率が金属などに比べて低いものを用いる。このため、外側シェルは、熱処理工程などでも金属製の巻芯に比べて熱膨張が生じにくく、巻取り製品に過度な面圧がかかることを防止することができる。よって、品質故障が起こりにくい。CFRPの線膨張率は、2e−6である。 As the material of the outer shell 21, a material such as a carbon fiber (CFRP) having a lower linear expansion coefficient than that of metal or the like is used. For this reason, the outer shell is less likely to undergo thermal expansion in a heat treatment process or the like as compared with a metal core, and an excessive surface pressure can be prevented from being applied to the wound product. Therefore, quality failure is unlikely to occur. The linear expansion coefficient of CFRP is 2e- 6 .

連結部31の材料は、ゴムなどの弾性を有するものを用いることが好ましい。連結部31は、内側シェル11の材料よりも弾性率が低いものであることが好ましい。また、連結部31は、ゴムなどの弾性材料に限定されない。連結部31は、例えば、金属製の板バネなど復元力を有し、かつ巻き締まりによる外側シェルの変形の幅方向分布を均一に保てる圧縮性を有する構造体であってもよい。さらに、連結部31の材料は、胴部2の径方向の弾性率が他の方向より小さい、異方性を有するものであってもよい。このような異方性を有する材料としては、例えば、円周方向に強化繊維を施したFRP樹脂などがある。ここで、連結部31を異方性を有する材料で構成した場合、その弾性率は、径方向、周方向、及び軸方向にわけて捉えることができる。ここで、連結部31の径方向の弾性率が、周方向及び軸方向の弾性率より小さいことが好ましい。こうすることで、連結部31は、ウェブ巻き取り時に径方向にのみ収縮する。   It is preferable to use a material having elasticity such as rubber as the material of the connecting portion 31. It is preferable that the connecting portion 31 has a lower elastic modulus than the material of the inner shell 11. Moreover, the connection part 31 is not limited to elastic materials, such as rubber | gum. For example, the connecting portion 31 may be a structural body having a restoring force such as a metal leaf spring and having a compressibility so as to keep a uniform distribution in the width direction of deformation of the outer shell due to the tightening. Furthermore, the material of the connection part 31 may have anisotropy in which the elastic modulus in the radial direction of the body part 2 is smaller than other directions. As such an anisotropic material, for example, there is an FRP resin provided with reinforcing fibers in the circumferential direction. Here, when the connection part 31 is comprised with the material which has anisotropy, the elastic modulus can be divided into a radial direction, a circumferential direction, and an axial direction, and can be caught. Here, it is preferable that the elastic modulus in the radial direction of the connecting portion 31 is smaller than the elastic modulus in the circumferential direction and the axial direction. By doing so, the connecting portion 31 contracts only in the radial direction when the web is wound.

次に、図3及び図4に基づいて、本発明の巻芯と通常の巻芯とのウェブ巻き取り時の変形の状態を説明する。図3(a)は、本発明の巻芯のウェブ巻き取り時の変形の状態を模式的に示す断面図である。図3(b)は、通常の巻芯のウェブ巻き取り時の変形の状態を模式的に示す断面図である。図3(a)及び図3(b)において、変形したときのシェルの位置を点線で示す。   Next, based on FIG.3 and FIG.4, the deformation | transformation state at the time of web winding of the winding core of this invention and a normal winding core is demonstrated. Fig.3 (a) is sectional drawing which shows typically the state of the deformation | transformation at the time of web winding of the core of this invention. FIG. 3B is a cross-sectional view schematically showing a state of deformation at the time of web winding of a normal winding core. 3A and 3B, the position of the shell when it is deformed is indicated by a dotted line.

本発明の巻芯1によれば、図3(a)に示すように、外側シェル21の厚みを薄くしても、巻き締められたウェブの面圧による変形が、胴部2の軸方向(ウェブWの幅方向)に均一となる。これは、連結部31がウェブの面圧に応じて胴部2の中心軸に対して径方向に適宜収縮したためである。一方で、図3(b)に示すように、本発明の巻芯1の構成を採用しない通常の巻芯では、シェルが単一であり、このシェルに巻き締められたウェブの面圧がかかるため、幅方向中央部分が、側板による突っ張り効果のある両端部分に比べて大きくたわむ。これは、巻芯1の幅方向中央部分は空洞であるのに対して、両端部分は側板に固定されているためである。すると、巻き取られたウェブには、幅方向にかかる負荷が不均一になるため、製品の品質が劣化してしまう。   According to the core 1 of the present invention, as shown in FIG. 3A, even if the thickness of the outer shell 21 is reduced, the deformation due to the surface pressure of the wound web is deformed in the axial direction ( Uniform in the width direction of the web W). This is because the connecting portion 31 is appropriately contracted in the radial direction with respect to the central axis of the body portion 2 in accordance with the surface pressure of the web. On the other hand, as shown in FIG.3 (b), in the normal winding core which does not employ | adopt the structure of the winding core 1 of this invention, a shell is single and the surface pressure of the web wound by this shell is applied. For this reason, the central portion in the width direction bends larger than both end portions having a tension effect by the side plate. This is because the center portion in the width direction of the core 1 is a cavity, whereas both end portions are fixed to the side plates. Then, since the load applied in the width direction becomes non-uniform on the wound web, the quality of the product is deteriorated.

図4は、ウェブ巻き取り時にウェブ自身にかかる面圧の大きさと幅方向の位置との関係を模式的に示すグラフである。図4において、本発明の巻芯1に巻き取られたウェブの状態を実線で示し、図3(b)の巻芯に巻き取られたウェブの状態を点線で示す。なお、図4において、横軸はウェブの幅方向の位置を示し、縦軸は、巻き取られたウェブにかかる面圧を示している。   FIG. 4 is a graph schematically showing the relationship between the magnitude of the surface pressure applied to the web itself and the position in the width direction when the web is wound. In FIG. 4, the state of the web wound around the core 1 of the present invention is indicated by a solid line, and the state of the web wound around the core of FIG. 3B is indicated by a dotted line. In FIG. 4, the horizontal axis indicates the position in the web width direction, and the vertical axis indicates the surface pressure applied to the wound web.

図3(b)の巻芯に巻き取られたウェブには、幅方向の両端部が中央部分に対して突出しているため、巻き取られるウェブと両端部との摩擦が大きくなり、該ウェブの両端部に巻き重ねられる部分に中央部分よりも大きな面圧がかかる。このように、巻き取られるウェブに局所的に圧力がかかると、ウェブ全体にかかる面圧の幅方向の分布が不均一になる。局所的に圧力がかかる部分では、ウェブ同士の摩擦によるダメージが生じやすく、また、ウェブの幅方向端部の伸縮が、中央部分に比べて規制されるため、ウェブ全体の変形が不均一になり、シワを引き起こす要因となる。   In the web wound around the core of FIG. 3 (b), both end portions in the width direction protrude with respect to the central portion, so that the friction between the wound web and both end portions increases, A surface pressure larger than that of the central portion is applied to the portion wound around both ends. As described above, when a pressure is locally applied to the web to be wound, the distribution in the width direction of the surface pressure applied to the entire web becomes non-uniform. In areas where pressure is locally applied, damage due to friction between the webs is likely to occur, and the expansion and contraction of the web in the width direction is restricted compared to the central part, resulting in uneven deformation of the entire web. , Cause wrinkles.

一方で、本発明の巻芯に巻き取られたウェブは、幅方向いずれの位置においてもウェブにかかる面圧が略等しくなる。これは、連結部31がウェブの面圧に応じて胴部2の中心軸に対して径方向に適宜収縮し、巻芯1の外側シェル21にたわみが生じていないため、巻き取られるウェブに局所的に他の部位と異なる面圧が生じていないためである。こうすれば、ウェブ全体にかかる面圧の幅方向の分布が均一になる。そして、ウェブ同士の摩擦によるダメージが生じることを防止できる。さらに、ウェブの幅方向端部の伸縮が、中央部分に比べて規制されることがないため、ウェブ全体の変形が均一になり、シワの発生を抑えられる。   On the other hand, the web wound around the core of the present invention has substantially the same surface pressure applied to the web at any position in the width direction. This is because the connecting portion 31 is appropriately contracted in the radial direction with respect to the central axis of the body portion 2 in accordance with the surface pressure of the web, and the outer shell 21 of the winding core 1 is not deflected. This is because the surface pressure different from other parts is not locally generated. By doing so, the distribution in the width direction of the surface pressure applied to the entire web becomes uniform. And it can prevent that the damage by the friction of webs arises. Furthermore, since the expansion and contraction of the end portion in the width direction of the web is not restricted as compared with the central portion, the deformation of the entire web becomes uniform and the generation of wrinkles can be suppressed.

また、本発明の巻芯1は、外側シェル21の厚みを薄く設計できるため、内側シェル11を金属などの剛性が高いものを採用し、外側シェル21としてCFRPなどの高価な材料を採用することができる。さらに、連結部31が、内側シェル11と外側シェル21との間で緩衝材としても機能する。このため、ウェブWの巻取工程や巻芯1にウェブWを巻き取った状態で搬送する際に、外部からの衝撃がくわわっても、巻取製品の故障の発生を抑えることができる。   In addition, since the core 1 of the present invention can be designed to have a thin outer shell 21, the inner shell 11 is made of a material such as metal having high rigidity, and the outer shell 21 is made of an expensive material such as CFRP. Can do. Further, the connecting portion 31 functions as a cushioning material between the inner shell 11 and the outer shell 21. For this reason, when the web W is wound or transported in a state where the web W is wound around the core 1, the occurrence of a failure of the wound product can be suppressed even if an external impact is applied.

巻芯1は、磁気記録媒体の製造工程におけるカレンダー工程で使用する巻芯に好適である。   The winding core 1 is suitable for a winding core used in a calendar process in the manufacturing process of a magnetic recording medium.

磁気記録媒体の製造工程の一例を説明する。先ず、原反ロールから帯状の支持体を搬送させ、塗布部において、この支持体の一方の面に磁性層塗布部材によって磁性層を塗布し、また、他方の面にバックコート層を塗布する。そして、磁性層が塗布された支持体を支持体巻取部に巻回させる。次に、支持体巻取部から支持体をカレンダー部に送り出し、該カレンダー部に設けられた複数のカレンダーロール同士の間に搬送させる。このとき、支持体をカレンダーロール同士の間のニップに通過させることで、支持体における磁性層表面の平滑性が向上される。そして、支持体を巻芯に巻回させて支持体ロールを形成する。この巻芯として、上述の巻芯1を採用することができる。その後、支持体ロールには、所定の温度に設定された環境雰囲気で、所定の時間放置される熱処理工程が行われる。この熱処理でウェブの熱収縮によりウェブがさらに巻き締まり、巻芯変形の幅方向分布が顕著になる。巻芯が幅方向に不均一な変形をすることでウェブは変形の少ない端部で面圧が高くなり、芯側で巻かれたウェブ同士の接触でウェブ表面にダメージが出やすくなる。さらに幅方向の変形が不均一になることでウェブの幅方向伸縮がブロックされやすくなり、ウェブにシワを引き起こす場合がある。ここで、本発明の巻芯は、ウェブ巻き取り時において上述したように連結部により幅方向に均一に変形するため、過度な面圧上昇やウェブのシワの発生を抑制することができ、好適である。さらに、例えば磁気テープを製造する際には、熱処理が施された支持体ロールを裁断工程においてスリッタによって長手方向にスリットすることで、所定のテープ幅を有する磁気テープを製造している。なお、磁気テープの製造方法は、上述のものに限定されない。また、巻芯も熱処理工程で使用するものに限定されず、他の工程においてウェブを巻き取るものに適用することができる。   An example of the manufacturing process of the magnetic recording medium will be described. First, a belt-like support is conveyed from the raw fabric roll, and in the coating unit, a magnetic layer is applied to one surface of the support by a magnetic layer application member, and a back coat layer is applied to the other surface. And the support body with which the magnetic layer was apply | coated is wound around a support body winding part. Next, the support body is sent out from the support body winding section to the calendar section, and is conveyed between a plurality of calendar rolls provided in the calendar section. At this time, the smoothness of the magnetic layer surface in the support is improved by passing the support through the nip between the calender rolls. And a support body is wound around a core and a support body roll is formed. As the core, the above-described core 1 can be employed. Thereafter, the support roll is subjected to a heat treatment step in which it is left for a predetermined time in an environmental atmosphere set at a predetermined temperature. With this heat treatment, the web is further wound by heat shrinkage of the web, and the distribution in the width direction of the core deformation becomes remarkable. When the winding core deforms unevenly in the width direction, the web has a high surface pressure at the end with little deformation, and the web surface is easily damaged by contact between the webs wound on the core side. Furthermore, the deformation in the width direction becomes non-uniform so that the expansion and contraction of the web in the width direction is likely to be blocked, and the web may be wrinkled. Here, the winding core of the present invention is uniformly deformed in the width direction by the connecting portion as described above at the time of winding the web, so that it is possible to suppress an excessive increase in the surface pressure and the generation of wrinkles on the web. It is. Furthermore, for example, when manufacturing a magnetic tape, a magnetic tape having a predetermined tape width is manufactured by slitting a heat-treated support roll in a longitudinal direction by a slitter in a cutting step. In addition, the manufacturing method of a magnetic tape is not limited to the above-mentioned thing. Further, the winding core is not limited to the one used in the heat treatment step, and can be applied to a web winding in another step.

上述した巻芯1の変形例を説明する。   A modification of the above-described core 1 will be described.

図5は、巻芯の変形例を模式的に示す図である。図5は、巻芯を胴部の軸方向に見た状態を示している。図5に示すように、巻芯1は、内側シェル11と外側シェル21との間に、両者のうちの一方のみが回転してしまうことを防止するための係止部が設けられている。係止部は、以下に説明するように、外側シェル21が胴部2の周方向に回転することを規制する凹凸を有する。   FIG. 5 is a diagram schematically showing a modification of the core. FIG. 5 shows a state in which the winding core is viewed in the axial direction of the body portion. As shown in FIG. 5, the core 1 is provided with a locking portion between the inner shell 11 and the outer shell 21 for preventing only one of them from rotating. As will be described below, the locking portion has irregularities that restrict the outer shell 21 from rotating in the circumferential direction of the body portion 2.

具体的には、外側シェル21の円筒部22の内周面には複数の凸部24が設けられている。図5では、複数の凸部24は、円筒部22の内周面の周方向に略等間隔で配置された3つの凸である。各凸部24は、円筒部22の内周面から内側シェル11の円筒部12の外周面に向かって突出する。   Specifically, a plurality of convex portions 24 are provided on the inner peripheral surface of the cylindrical portion 22 of the outer shell 21. In FIG. 5, the plurality of convex portions 24 are three convex portions arranged at substantially equal intervals in the circumferential direction of the inner peripheral surface of the cylindrical portion 22. Each convex portion 24 protrudes from the inner peripheral surface of the cylindrical portion 22 toward the outer peripheral surface of the cylindrical portion 12 of the inner shell 11.

また、連結部31には、複数の凹部32が設けられている。図5では、複数の凹部32は、円筒部12の外周面の周方向に略等間隔で配置された3つの凹である。凹部32には、凸部24が入り込んでいる。凸部24と凹部32との間の、胴部2の周方向における隙間の寸法は、外側シェル21が内側シェル11に対して周方向にガタつかない範囲に設計され、ここでは略0.1mmとする。また、凸部24の先端部と凹部32の表面との円筒部の中心軸に対して径方向の隙間は、外側シェル21の変形量より大きくすることが好ましい。   In addition, the connecting portion 31 is provided with a plurality of recesses 32. In FIG. 5, the plurality of concave portions 32 are three concave portions arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the cylindrical portion 12. The convex portion 24 enters the concave portion 32. The dimension of the gap in the circumferential direction of the body part 2 between the convex part 24 and the concave part 32 is designed in a range in which the outer shell 21 does not rattle in the circumferential direction with respect to the inner shell 11, and here is approximately 0.1 mm. And Further, it is preferable that the radial gap with respect to the central axis of the cylindrical portion between the tip portion of the convex portion 24 and the surface of the concave portion 32 be larger than the deformation amount of the outer shell 21.

外側シェル21のみに図5中矢印で示す回転方向の力が加わるとき、円筒部22の凸部24が凹部32に係止される。このため、ウェブWを巻き取るときに、外側シェル21のみが回転することがなく、外側シェル21と内側シェル11を常に一体で回転させることができる。凸部24と凹部32が互いに係止することによって、内側シェル11と外側シェル21の間に相対すべりが発生することを防止でき、所望の回転数、テンションでウェブを巻き取ることが可能となる。   When a rotational force indicated by an arrow in FIG. 5 is applied only to the outer shell 21, the convex portion 24 of the cylindrical portion 22 is locked to the concave portion 32. For this reason, when winding the web W, only the outer shell 21 does not rotate, and the outer shell 21 and the inner shell 11 can always be rotated integrally. By engaging the convex portion 24 and the concave portion 32 with each other, it is possible to prevent relative slippage between the inner shell 11 and the outer shell 21, and it is possible to wind the web at a desired rotational speed and tension. .

なお、係止部は、図5に示す構成に限定されない。例えば、外側シェル21の円筒部22の内周に凹部を設け、内側シェル11の円筒部12の外周に凸部を設けてもよい。   The locking portion is not limited to the configuration shown in FIG. For example, a concave portion may be provided on the inner periphery of the cylindrical portion 22 of the outer shell 21, and a convex portion may be provided on the outer periphery of the cylindrical portion 12 of the inner shell 11.

複数の凸部24、及び複数の凹部32の数はいずれも限定されない。   The number of the plurality of convex portions 24 and the plurality of concave portions 32 is not limited.

本明細書は次の事項を開示する。
(1) 円筒形状の胴部を有し、
前記胴部が、内側シェルと、前記内側シェルの外周を囲う外側シェルとを含み、
前記内側シェルと前記外側シェルとを連結する連結部と、を備えるウェブ用の巻芯であって、
前記連結部は、前記内側シェル及び前記外側シェルの間で、かつ前記胴部の軸方向の両端部にのみ設けられているウェブ用の巻芯。
(2)(1)に記載のウェブ用の巻芯であって、
前記連結部の材料は、前記内側シェルを構成する材料よりも弾性率の小さいウェブ用の巻芯。
(3)(1)又は(2)に記載のウェブ用の巻芯であって、
前記連結部の材料は、前記胴部の径方向の弾性率が軸方向と周方向の弾性率より小さい異方性を有するウェブ用の巻芯。
(4)(1)から(3)のいずれか1つに記載のウェブ用の巻芯であって、
前記外側シェルと前記連結部との間に係止部が設けられ、前記係止部は、前記外側シェルが前記胴部の周方向に回転することを規制する凹凸を有するウェブ用の巻芯。
(5)(1)から(4)のいずれか1つに記載のウェブ用の巻芯であって、
前記連結部がゴムであるウェブ用の巻芯。
(6)(1)から(5)のいずれか1つに記載のウェブ用の巻芯であって、
前記外側シェルの材料が、CFRPであるウェブ用の巻芯。
This specification discloses the following matters.
(1) It has a cylindrical body,
The trunk includes an inner shell and an outer shell surrounding an outer periphery of the inner shell;
A web winding core comprising: a connecting portion that connects the inner shell and the outer shell;
The connecting portion is a web core provided between the inner shell and the outer shell and only at both ends in the axial direction of the body portion.
(2) The web core according to (1),
A material for the connecting portion is a web core having a smaller elastic modulus than a material constituting the inner shell.
(3) The web core according to (1) or (2),
The material of the connecting portion is a web core having anisotropy in which the elastic modulus in the radial direction of the body portion is smaller than the elastic modulus in the axial direction and the circumferential direction.
(4) The web core according to any one of (1) to (3),
The web winding core is provided with an engaging portion between the outer shell and the connecting portion, and the engaging portion has irregularities that restrict the outer shell from rotating in the circumferential direction of the body portion.
(5) The web core according to any one of (1) to (4),
A web core in which the connecting portion is rubber.
(6) The web core according to any one of (1) to (5),
A web core in which the material of the outer shell is CFRP.

1 巻芯
2 胴部
11 内側シェル
12 円筒部
21 外側シェル
22 円筒部
31 連結部
DESCRIPTION OF SYMBOLS 1 Core 2 Body 11 Inner shell 12 Cylindrical part 21 Outer shell 22 Cylindrical part 31 Connection part

Claims (6)

円筒形状の胴部を有し、
前記胴部が、内側シェルと、前記内側シェルの外周を囲う外側シェルとを含み、
前記内側シェルと前記外側シェルとを連結する連結部と、を備えるウェブ用の巻芯であって、
前記連結部は、前記内側シェル及び前記外側シェルの間で、かつ前記胴部の軸方向の両端部にのみ設けられ、
前記連結部の材料は、前記内側シェルを構成する材料よりも弾性率が小さい材料であり、
前記内側シェルと前記外側シェルとの間における前記両端部以外の領域の全体に隙間が形成されているウェブ用の巻芯。
Having a cylindrical body,
The trunk includes an inner shell and an outer shell surrounding an outer periphery of the inner shell;
A web winding core comprising: a connecting portion that connects the inner shell and the outer shell;
The connecting portion is provided only between the inner shell and the outer shell and at both ends in the axial direction of the trunk portion,
The material of the connecting portion is a material having a smaller elastic modulus than the material constituting the inner shell,
A web core in which a gap is formed in an entire region other than the both end portions between the inner shell and the outer shell.
請求項1に記載のウェブ用の巻芯であって、
前記連結部の材料は、前記胴部の径方向の弾性率が軸方向と周方向の弾性率より小さい異方性を有する材料であるウェブ用の巻芯。
The web core according to claim 1 ,
The core of the web, wherein the material of the connecting portion is a material having anisotropy smaller than the elastic modulus in the axial direction and the circumferential direction in the radial direction of the body portion.
円筒形状の胴部を有し、  Having a cylindrical body,
前記胴部が、内側シェルと、前記内側シェルの外周を囲う外側シェルとを含み、  The trunk includes an inner shell and an outer shell surrounding an outer periphery of the inner shell;
前記内側シェルと前記外側シェルとを連結する連結部と、を備えるウェブ用の巻芯であって、  A web winding core comprising: a connecting portion that connects the inner shell and the outer shell;
前記連結部は、前記内側シェル及び前記外側シェルの間で、かつ前記胴部の軸方向の両端部にのみ設けられ、  The connecting portion is provided only between the inner shell and the outer shell and at both ends in the axial direction of the trunk portion,
前記連結部の材料は、前記胴部の径方向の弾性率が軸方向と周方向の弾性率より小さい異方性を有する材料であり、  The material of the connecting portion is a material having anisotropy in which the elastic modulus in the radial direction of the trunk portion is smaller than the elastic modulus in the axial direction and the circumferential direction,
前記内側シェルと前記外側シェルとの間における前記両端部以外の領域の全体に隙間が形成されているウェブ用の巻芯。  A web core in which a gap is formed in an entire region other than the both end portions between the inner shell and the outer shell.
請求項1から3のいずれか1項に記載のウェブ用の巻芯であって、
前記外側シェルと前記連結部との間に係止部が設けられ、前記係止部は、前記外側シェルが前記胴部の周方向に回転することを規制する凹凸を有するウェブ用の巻芯。
The web core according to any one of claims 1 to 3,
The web winding core is provided with an engaging portion between the outer shell and the connecting portion, and the engaging portion has irregularities that restrict the outer shell from rotating in the circumferential direction of the body portion.
請求項1から4のいずれか1項に記載のウェブ用の巻芯であって、
前記連結部がゴムであるウェブ用の巻芯。
The web core according to any one of claims 1 to 4, wherein:
A web core in which the connecting portion is rubber.
請求項1から5のいずれか1項に記載のウェブ用の巻芯であって、
前記外側シェルの材料が、CFRPであるウェブ用の巻芯。
A web core according to any one of claims 1 to 5,
A web core in which the material of the outer shell is CFRP.
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