JP5002284B2 - Tapered container mold - Google Patents
Tapered container mold Download PDFInfo
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- JP5002284B2 JP5002284B2 JP2007042162A JP2007042162A JP5002284B2 JP 5002284 B2 JP5002284 B2 JP 5002284B2 JP 2007042162 A JP2007042162 A JP 2007042162A JP 2007042162 A JP2007042162 A JP 2007042162A JP 5002284 B2 JP5002284 B2 JP 5002284B2
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- container
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229920003002 synthetic resin Polymers 0.000 claims description 12
- 239000000057 synthetic resin Substances 0.000 claims description 12
- 239000011888 foil Substances 0.000 claims description 11
- 239000011247 coating layer Substances 0.000 claims description 10
- 239000012792 core layer Substances 0.000 claims description 9
- 230000003746 surface roughness Effects 0.000 claims 1
- 239000012778 molding material Substances 0.000 description 26
- 238000000465 moulding Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- -1 polyethylene Polymers 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
本発明は、アルミニウム箔芯層とその両面に形成せられた合成樹脂被覆層とよりなる積層シートを深絞り成形してテーパ付き容器を得るのに用いられる成形金型に関する。 The present invention relates to a molding die used to obtain a tapered container by deep drawing a laminated sheet comprising an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof.
なお、この明細書において、アルミニウムには、純アルミニウムおよびアルミニウム合金が含まれる。また、パンチの上下方向は、パンチの先端が上向きの状態での方向をいう。 In this specification, aluminum includes pure aluminum and aluminum alloys. The vertical direction of the punch refers to a direction in which the tip of the punch is upward.
アルミニウム箔芯層とその両面に形成せられた合成樹脂被覆層とよりなる積層シートを深絞り成形してテーパ付き容器を得る場合、金型形状の因子としてパンチR部の大きさがある。なぜなら、成形材料は、成形時パンチの先端部で固定され、パンチR部で絞り荷重の大部分が支えられた状態で引張り力が働くので、パンチR部で成形材料は薄くなるからである。このさい、パンチR部の大きさが小さいとパンチR部にかかる荷重が局部的に高くなるため材料厚の減少が大きくなる。逆にＲ部の大きさが大きいと成形材料がパンチ底部になじまず、材料厚が減少する。したがって、パンチR部の大きさを適正な範囲に調整することが重要である。そして、容器の口部内径に対する深さの比が大きい深い容器の場合は、成形が難しいため、パンチR部の調整がより厳しく要求される。 When a taper container is obtained by deep drawing a laminated sheet composed of an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof, the size of the punch R part is a factor of the mold shape. This is because the molding material is fixed at the tip of the punch during molding, and a tensile force acts in a state where most of the drawing load is supported by the punch R portion, so that the molding material becomes thin at the punch R portion. At this time, if the size of the punch R portion is small, the load applied to the punch R portion is locally increased, so that the material thickness is greatly reduced. On the other hand, if the size of the R portion is large, the molding material does not conform to the punch bottom and the material thickness decreases. Therefore, it is important to adjust the size of the punch R portion within an appropriate range. And in the case of a deep container with a large ratio of the depth to the inner diameter of the mouth of the container, it is difficult to form, and therefore, the adjustment of the punch R part is required more strictly.
本発明者は、先にテーパ付き容器の成形時における成形材料の破断を防ぐために、下記特許文献１に開示されているようなパンチR部の曲率半径が０．５〜１５ｍｍでパンチR部の加工仕上げ粗度（Ｒａ）が０．３〜３μｍとなされた成形金型を提案した。ここで、パンチR部の曲率半径を０．５〜１５ｍｍに限定したのは、パンチR部の曲率半径が０．５ｍｍ未満では、この部分での成形材料の厚さの減少が大きく、１５ｍｍを超えると、成形材料がパンチの先端部になじまず、所定のシャープな形状が得られないからである。
しかしながら、その後の実験等においてパンチR部の粗度（Ｒａ）だけを調整しても、成形終了直前にパンチR部からパンチ側面に成形材料が接触した段階で、パンチR部とパンチ側面の粗度の差により成形材料の滑りに差が生じ、パンチR部とパンチ側面の境界で成形材料が破断するおそれがあることが判明し、パンチR部を含めその下方のパンチ側面全体の粗度（Ｒａ）とのバランスが重要であることを本発明者は知見した。また、本発明者は、パンチR部の粗度（Ｒａ）をある程度の粗さに粗面加工した方が成形材料の破断防止になることを見出した。 However, even if only the roughness (Ra) of the punch R portion is adjusted in subsequent experiments, the roughness of the punch R portion and the punch side surface is in the stage where the molding material contacts the punch side from the punch R portion immediately before the end of molding. Due to the difference in degree, it was found that there was a difference in the slip of the molding material, and the molding material could break at the boundary between the punch R part and the punch side surface. The present inventor has found that the balance with Ra) is important. Further, the present inventor has found that the surface of the punch R portion having a roughness (Ra) that is roughened to a certain degree can prevent the molding material from being broken.
本発明の目的は、アルミニウム箔芯層とその両面に形成せられた合成樹脂被覆層とよりなる積層シートを深絞り成形するさい、成形材料がパンチＲ部付近で破断するおそれのないテーパ付き容器の成形金型を提供するにある。 It is an object of the present invention to taper a container in which a molding material is not likely to break in the vicinity of a punch R portion when a laminated sheet comprising an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof is deep drawn. To provide a molding die.
請求項１の発明によるテーパ付き容器の成形金型は、アルミニウム箔芯層とその両面に形成せられた合成樹脂被覆層とよりなる積層シートを深絞り成形してテーパ付き容器を成形するのに用いられかつパンチR部の曲率半径が０．５〜１５ｍｍである金型において、パンチR部の粗度（Ｒａ）が２〜１２μｍ、パンチR部の下方長さ５〜３０ｍｍ領域のパンチ側面上部の粗度（Ｒａ）が０．１〜２μｍ、パンチ側面残部の粗度（Ｒａ）が０．０２〜０．１μｍとなされていることを特徴とするものである。
The molding die for a tapered container according to the invention of
成形開始後にパンチに接触した成形材料には、パンチR部を基点に引張荷重が働くが、パンチR部の粗度（Ｒａ）を大きくすることにより、パンチＲ部に接触した成形材料がパンチＲ部で保持されて底面から流れにくくなり、破断するのが防止せられる。このさい、パンチR部の粗度（Ｒａ）が２μｍ未満では、粗くした効果が認められず、成形時にパンチＲ部の材料が底面からパンチ側面に流れ易いため、破断する。逆に、パンチR部の粗度（Ｒａ）が１０μｍを超えると、成形材料がパンチに喰い込み過ぎて材料表面に傷が付き易くなり、成形中に破断し易くなる。 The molding material that has come into contact with the punch after the start of molding is subjected to a tensile load with the punch R portion as the starting point. However, by increasing the roughness (Ra) of the punch R portion, the molding material that has come into contact with the punch R portion becomes the punch R portion. It is held at the portion and is difficult to flow from the bottom surface and is prevented from breaking. At this time, when the roughness (Ra) of the punch R portion is less than 2 μm, the effect of roughening is not recognized, and the material of the punch R portion easily flows from the bottom surface to the side surface of the punch during molding, and thus breaks. On the other hand, when the roughness (Ra) of the punch R portion exceeds 10 μm, the molding material bites into the punch too much and the surface of the material is easily damaged, and is easily broken during molding.
成形が終りに近づくと、成形材料がパンチ側面部に接触するが、容器がテーパ状であるため、成形材料には円錐方向に伸びながらパンチ周方向に縮む作用が働く。このさい、パンチ側面の粗度を小さくすることにより、パンチとの接触抵抗を少なくして成形材料が抵抗なくパンチ周方向に縮むようにする。パンチR部の下方長さ５〜３０ｍｍ領域のパンチ側面上部より下方の側面下方残部の粗度（Ｒａ）が、０．０２μｍ未満でも効果は変わらないので、これ以上小さくする必要性がなく、むしろ小さくすることは粗面加工に時間がかかり無駄である。逆に、０．１μｍを超えると、成形材料がパンチ周方向に縮むときの抵抗になり、縦方向の亀裂が生じるおそれがある。ところで、パンチR部と上記パンチ側面下方残部との中間部に相当する部分、すなわちパンチR部の下方長さ５〜３０ｍｍ領域の粗度（Ｒａ）を０．１〜２μｍに限定したのは、成形材料は成形が進むにつれてパンチR部から徐々にパンチ側面に接していくが、パンチR部とパンチ側面の繋ぎ部分に中間の粗度部分を設けることにより、成形材料の接触が粗度の大きいパンチＲ部から粗度の小さいパンチ側面に達したさいに、成形材料の接触抵抗が急に小さくなることにより、パンチR部とパンチ側面の繋ぎ部分で破断が生じるのを防止するためである。このさい、粗度が０．１μｍ未満であると、成形材料の接触抵抗が小さくて材料の伸びによる破断が発生するおそれがある。逆に、２μｍを超えると、パンチ側面では周方向の縮みも発生するので、成形材料の接触抵抗が大き過ぎると、成形材料が縮む時の抵抗になり、縦方向の亀裂が生じるおそれがある。 As the molding approaches the end, the molding material comes into contact with the side surface of the punch, but since the container is tapered, the molding material has an action of contracting in the circumferential direction of the punch while extending in the conical direction. At this time, by reducing the roughness of the side surface of the punch, the contact resistance with the punch is reduced, so that the molding material shrinks in the punch circumferential direction without resistance. The effect does not change even if the roughness (Ra) of the lower side of the side surface below the upper part of the side of the punch in the region where the length of the lower part of the punch R part is 5 to 30 mm is less than 0.02 μm. Making it small is time consuming and rough for roughing. On the other hand, when the thickness exceeds 0.1 μm, resistance is caused when the molding material shrinks in the circumferential direction of the punch, and there is a possibility that a vertical crack may occur. By the way, the portion corresponding to the intermediate portion between the punch R portion and the punch side lower portion remaining, that is, the roughness (Ra) of the region having a lower length of 5-30 mm of the punch R portion is limited to 0.1 to 2 μm. The molding material gradually contacts the side of the punch from the punch R part as molding progresses, but by providing an intermediate roughness part at the joint between the punch R part and the side of the punch, the contact of the molding material is large. This is to prevent breakage at the joint portion between the punch R portion and the punch side surface due to a sudden decrease in the contact resistance of the molding material upon reaching the punch side surface with a low roughness from the punch R portion. At this time, when the roughness is less than 0.1 μm, the contact resistance of the molding material is small, and there is a possibility that breakage occurs due to elongation of the material. On the other hand, when the thickness exceeds 2 μm, shrinkage in the circumferential direction also occurs on the side surface of the punch. Therefore, if the contact resistance of the molding material is too large, the molding material becomes a resistance when shrinking, and there is a possibility of causing a vertical crack.
アルミニウム箔芯層の両面に合成樹脂被覆層を形成する方法としては、アルミニウム箔に合成樹脂フィルムを接合する方法とアルミニウム箔に合成樹脂をコーティングする方法がある。容器の外面側に使用される合成樹脂の具体例としては、フィルムの場合、ポリエチレン、ポリプロピレン、ポリエステルおよびこれらの共重合体があげられ、コーティングの場合、熱硬化型アクリル樹脂およびエポキシ樹脂があげられる。また、容器の内面側に使用される合成樹脂の具体例としては、フィルムの場合、ポリエチレン、ポリプロピレン、ポリエステルおよびこれらの共重合体があげられ、コーティングの場合、塩化酢酸ビニールおよび酸変性ポリオレフィンがあげられる。 As a method of forming a synthetic resin coating layer on both surfaces of an aluminum foil core layer, there are a method of bonding a synthetic resin film to an aluminum foil and a method of coating a synthetic resin on an aluminum foil. Specific examples of the synthetic resin used on the outer surface side of the container include polyethylene, polypropylene, polyester and copolymers thereof in the case of a film, and thermosetting acrylic resin and epoxy resin in the case of coating. . Specific examples of the synthetic resin used on the inner surface of the container include polyethylene, polypropylene, polyester, and copolymers thereof in the case of films, and vinyl chloride and acid-modified polyolefins in the case of coating. It is done.
上記テーパ付き容器は、一般に、つぎの３段の工程を経て製造される。すなわち、アルミニウム箔芯層とその両面に形成せられた合成樹脂被覆層とよりなる積層シートよりなる成形材料を有底ストレート円筒状に成形する第１段の工程と、第１段の工程で得られた有底ストレート円筒体にさらに深絞りを施す第２段の工程と、本発明による金型を使用し、第２段の工程で得られた有底ストレート円筒体を有底テーパ付き円筒体に成形する第３段の工程である。しかしながら、前記有底ストレート円筒体の成形工程を２段にせず１段のみにしてもよいし、さらには本発明による金型を使用した有底テーパ付き円筒体の成形工程のみでもよい。 The tapered container is generally manufactured through the following three steps. That is, it is obtained in the first step and the first step of molding a molding material comprising a laminated sheet comprising an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof into a bottomed straight cylindrical shape. A second-stage process for further deep-drawing the bottomed straight cylindrical body and a bottomed straight cylindrical body obtained by the second-stage process using the mold according to the present invention, and a bottomed tapered cylinder This is a third stage process. However, the forming process of the bottomed straight cylindrical body may be only one stage instead of two stages, or may be only the molding process of the bottomed tapered cylinder using the mold according to the present invention.
本発明のテーパ付き容器の成形金型によれば、アルミニウム箔芯層とその両面に形成せられた合成樹脂被覆層とよりなる積層シートを深絞り成形するさい、成形材料がパンチＲ部付近で破断するおそれがない。 According to the mold for forming a tapered container of the present invention, when a laminated sheet comprising an aluminum foil core layer and a synthetic resin coating layer formed on both sides thereof is deep drawn, the molding material is near the punch R portion. There is no risk of breaking.
図１は、本発明によるテーパ付き容器の成形金型を示し、同金型のパンチ１のＲ部２の曲率半径、Ｒ部２の粗度（Ｒａ）、Ｒ部２の下方長さL１１０ｍｍ領域の側面上部３の粗度（Ｒａ）および側面上部３の下方残部長さL２領域の側面残部４の粗度（Ｒａ）が、それぞれ下記表１の実施例通りとなされるものである。
FIG. 1 shows a molding die for a tapered container according to the present invention. The radius of curvature of the
上記金型を用い、実施例通りのテーパ付き容器を成形した。
本発明をどのように実施するかを具体的に説明するために、以下に実施例および比較例を示す。
Using the mold, a tapered container as in the example was formed.
In order to specifically explain how the present invention is carried out, examples and comparative examples are shown below.
厚さ１２０μのアルミニウム箔芯層とその内面に形成せられた厚さ２００μのフィルムよりなる未延伸ポリプロピレン被覆層とその外面に形成せられた厚さ３０μのフィルムよりなる未延伸ポリプロピレン被覆層よりなる積層シートを下記表１に示す金型を用いて冷間深絞り成形することにより製品であるテーパ付き容器を成形した。 An aluminum foil core layer having a thickness of 120 μm, an unstretched polypropylene coating layer comprising a 200 μm film formed on the inner surface thereof, and an unstretched polypropylene coating layer comprising a film having a thickness of 30 μm formed on the outer surface thereof. The laminated sheet was formed by cold deep drawing using the mold shown in Table 1 to form a tapered container as a product.
同表１に、本発明の実施例と比較例とをあげ、容器側壁の成形状態の観察評価結果を示した。
１ パンチ
２ Ｒ部
３ 側面上部
４ 側面残部
L１ Ｒ部の下方長さ
L２ 側面上部の下方残部長さ
1 Punch 2
Lower length of L 1 R section
L 2 Lower remaining length at the top of the side
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007042162A JP5002284B2 (en) | 2007-02-22 | 2007-02-22 | Tapered container mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007042162A JP5002284B2 (en) | 2007-02-22 | 2007-02-22 | Tapered container mold |
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| Publication Number | Publication Date |
|---|---|
| JP2008201083A JP2008201083A (en) | 2008-09-04 |
| JP2008201083A5 JP2008201083A5 (en) | 2010-04-02 |
| JP5002284B2 true JP5002284B2 (en) | 2012-08-15 |
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| JP2818314B2 (en) * | 1991-04-12 | 1998-10-30 | 新日本製鐵株式会社 | Processing method of DI punch for can making |
| JP3652611B2 (en) * | 2001-02-16 | 2005-05-25 | 日本写真印刷株式会社 | Method for producing molded decorative sheet and method for producing molded product with decorative sheet |
| JP4206499B2 (en) * | 2003-11-20 | 2009-01-14 | 昭和電工パッケージング株式会社 | Tapered container mold |
| JP2005153894A (en) * | 2003-11-20 | 2005-06-16 | Showa Denko Packaging Co Ltd | Container for sealing beverage, food or the like |
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