JP5000169B2 - Method for forming a sealing liner in a metal container lid shell - Google Patents

Method for forming a sealing liner in a metal container lid shell Download PDF

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JP5000169B2
JP5000169B2 JP2006088463A JP2006088463A JP5000169B2 JP 5000169 B2 JP5000169 B2 JP 5000169B2 JP 2006088463 A JP2006088463 A JP 2006088463A JP 2006088463 A JP2006088463 A JP 2006088463A JP 5000169 B2 JP5000169 B2 JP 5000169B2
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liner
liner material
shell
molding method
heating
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JP2007261626A (en
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慎次 小田嶋
剛 國本
直揮 青山
茉央 古澤
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Nippon Closures Co Ltd
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Description

本発明は、金属製容器蓋シェルの天面壁の内面に、加熱することによって硬化され且つ発泡されるライナー素材を供給し、次いでライナー素材を加熱して密封用ライナーを成形するライナー成形方法に関する。   The present invention relates to a liner molding method in which a liner material that is cured and foamed by heating is supplied to the inner surface of the top wall of a metal container lid shell, and then the liner material is heated to form a sealing liner.

下記特許文献１には、天面壁とこの天面壁の周縁から垂下する筒状スカート壁とを有する金属製容器蓋シェルの、天面壁の内面に、加熱することによって硬化され且つ発泡されるライナー素材を供給し、次いでライナー素材を加熱して密封ライナーを成形することが開示されている。シェルの天面壁の内面へのライナーの供給は、周知のスピンライニング法によって好都合に遂行され、天面壁の内面周縁部にリング状にライナー素材が供給される。密封ライナーの加熱は、ライナー素材が供給されたシェルをオーブン内に収容することによって遂行される。
特開２００３−２０５９６３号公報 The following Patent Document 1 discloses a liner material that is hardened and foamed by heating on the inner surface of the top surface wall of a metal container lid shell having a top surface wall and a cylindrical skirt wall depending from the periphery of the top surface wall. And then heating the liner stock to form a sealed liner. The supply of the liner to the inner surface of the top wall of the shell is conveniently performed by a known spin lining method, and the liner material is supplied in a ring shape to the inner peripheral edge of the top wall. The sealing liner is heated by housing the shell supplied with the liner material in an oven.
JP 2003-205963 A

而して、上述した従来技術には、（１）周方向に充分に均一な厚さを有するライナーを形成することができず、厚さに０．１ｍｍ程度の変動が生成され、これに起因して必ずしも充分な密封性能が得られない、（２）厚さの変動を考慮すると、ライナー素材の供給量を比較的多くすることが必要であり、製造コストが増大する、という解決すべき問題が存在する。   Thus, in the above-described prior art, (1) a liner having a sufficiently uniform thickness in the circumferential direction cannot be formed, and a variation of about 0.1 mm is generated in the thickness. (2) Considering the variation in thickness, it is necessary to relatively increase the supply amount of the liner material, which increases the manufacturing cost. Exists.

本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、加熱することによって硬化されると共に発泡されるライナー素材を加熱して、周方向に充分に均一な厚さを有し、所望の密封性能を達成することができ、そしてまたライナー素材の供給量を必要最小限にして製造コストの増大を回避することができる、新規且つ改良されたライナー成形方法を提供することである。   The present invention has been made in view of the above-mentioned facts, and its main technical problem is to heat the liner material that is cured and foamed by heating to have a sufficiently uniform thickness in the circumferential direction. And providing a new and improved liner molding method that can achieve a desired sealing performance and that can also minimize the supply amount of the liner material to avoid an increase in manufacturing cost. is there.

本発明者等は、鋭意検討の結果、所要温度に加熱された型押部材を所要圧力でライナー素材に作用させ、ライナー素材を所要形状に型押成形しながら加熱することによって、上記主たる技術的課題を達成することができることを見出した。   As a result of intensive studies, the inventors have made the above-mentioned main technical effect by causing the stamping member heated to the required temperature to act on the liner material at the required pressure and heating the liner material while stamping into the required shape. I have found that I can achieve the task.

即ち、本発明によれば、上記主たる技術的課題を達成するライナー成形方法として、天面壁と該天面壁の周縁から垂下する筒状スカート壁とを有する金属製容器蓋シェルの、該天面壁の内面周縁部に、加熱することによって硬化され且つ発泡される、液状ポリオール、液状ポリイソシアネート及び熱膨張性中空粒子を含むライナー素材を、スピンライニング方法によってリング状に供給し、次いで該ライナー素材を加熱して密封用ライナーを成形するライナー成形方法において、
該熱膨張性中空粒子の発泡開始温度以上で且つ該熱膨張性中空粒子の発泡ピーク温度以下に加熱されている型押部材を所要圧力で該ライナー素材に作用させることによって該ライナー素材を所要形状に型押成形しながら加熱する、ことを特徴とするライナー成形方法が提供される。 That is, according to the present invention, as a liner molding method for achieving the main technical problem, a metal container lid shell having a top wall and a cylindrical skirt wall depending from the periphery of the top wall, A liner material containing liquid polyol, liquid polyisocyanate, and thermally expandable hollow particles, which is cured and foamed by heating, is supplied in a ring shape by a spin lining method, and then the liner material is heated. In a liner molding method for molding a sealing liner,
The liner material is shaped into a desired shape by causing a stamping member heated to a temperature higher than the foaming start temperature of the thermally expandable hollow particles and below the foaming peak temperature of the thermally expandable hollow particles to act on the liner material at a required pressure. There is provided a liner molding method characterized by heating while embossing.

好ましくは、該型押部材は０．５乃至１０ｋｇ／ｃｍ２の圧力で該ライナー素材に作用させられる。該シェルの内面にはポリエステル系被覆が施されており、該型押部材を該ライナー素材に作用させる際には、該シェルは該ポリエステル系被覆のガラス転移温度以上で且つ該ポリエステル系被覆の黄変温度以下に加熱されたアンビル上に載置されるのが好適である。 Preferably, the embossing member is 0 . The liner material is applied at a pressure of 5 to 10 kg / cm 2 . The inner surface of the shell is coated with a polyester-based coating. When the embossing member is allowed to act on the liner material, the shell has a glass transition temperature higher than that of the polyester-based coating, and the yellow color of the polyester-based coating. It is preferable to be placed on an anvil heated to a temperature lower than the change temperature.

本発明のライナー成形方法によれば、型押部材を所要圧力でライナー素材に作用させることによってライナーの表面を所要形状に規制し、かくして周方向に充分に均一な厚さを有するライナーを形成することができる。また、型押部材を所要温度に加熱し所要圧力でライナー素材に作用させることによって、ライナー素材を所要とおりに硬化させ所要とおりに発泡させることができる。型押部材の作用圧力が過大になると、ライナー素材の発泡が不充分になり、型押部材の作用圧力が過小になると、ライナーの表面形状に乱れが生成される傾向がある。   According to the liner molding method of the present invention, the surface of the liner is regulated to a required shape by causing the embossing member to act on the liner material with a required pressure, and thus a liner having a sufficiently uniform thickness in the circumferential direction is formed. be able to. Further, by heating the embossing member to a required temperature and acting on the liner material at a required pressure, the liner material can be cured as required and foamed as required. When the working pressure of the embossing member is excessive, foaming of the liner material becomes insufficient, and when the working pressure of the embossing member is too small, the surface shape of the liner tends to be disturbed.

以下、本発明のライナー成形方法の好適実施形態について、添付図面を参照して更に詳述する。   Hereinafter, preferred embodiments of the liner molding method of the present invention will be described in more detail with reference to the accompanying drawings.

本発明のライナー成形方法は、図１に簡略に示しているスピンライニング工程を含んでいる。このスピンライニング工程においては、金属製容器蓋シェル２の所要部位にライナー素材が供給される。詳述すると、アルミニウム基合金、クロム酸処理鋼板或いはブリキの如き適宜の金属薄板から形成することができるシェル２は円形天面壁４とこの天面壁４の周縁から垂下する円筒形スカート壁６を有する。シェル２の内面にはポリエステル系被覆が施されているのが好都合である。ポリエステル系被覆の詳細については上記特許文献１を参照されたい。シェル２の外面には適宜の被覆と共に所要印刷を施すことができる。かようなシェル２は倒立状態、即ち天面壁４の内面を上方に向けた状態、で回転テーブル１０上に載置される。実質上水平に延在する上面を有する回転テーブル１０には、上面から下方に延びる吸引路１２が形成されており、かかる吸引路１２を通して大気を吸引することによって回転テーブル１０上にシェル２が真空吸着される。流動性を有するライナー素材を流出するノズル１４が、その下端に形成されている流出口を回転テーブル１０の上面に載置されたシェル２の天面壁４の内面周縁部に対向させて位置付けられる。そして、回転テーブル１０を所要速度で回転、従って回転テーブル１０の上面に吸着されているシェル２を所要速度で回転させながら、ノズル１４からライナー素材１６を流出させ、かくしてシェル２の天面壁４の内面周縁部に合成樹脂素材を円環状に供給する。 Liner molding how the present invention includes a spin lining process is shown schematically in Figure 1. In this spin lining process, the liner material is supplied to a required portion of the metal container lid shell 2. More specifically, the shell 2 which can be formed from an appropriate metal thin plate such as an aluminum-based alloy, a chromic acid- treated steel plate or tinplate has a circular top wall 4 and a cylindrical skirt wall 6 depending from the periphery of the top wall 4. . The inner surface of the shell 2 is conveniently provided with a polyester coating. For details of the polyester-based coating, see Patent Document 1 above. The outer surface of the shell 2 can be subjected to required printing together with an appropriate coating. Such a shell 2 is placed on the turntable 10 in an inverted state, that is, with the inner surface of the top wall 4 facing upward. A suction path 12 extending downward from the upper surface is formed in the rotary table 10 having a top surface that extends substantially horizontally, and the shell 2 is vacuumed on the rotary table 10 by sucking air through the suction path 12. Adsorbed. The nozzle 14 that flows out the liner material having fluidity is positioned with the outlet formed at the lower end thereof facing the inner peripheral edge of the top wall 4 of the shell 2 placed on the upper surface of the rotary table 10. Then, the liner material 16 flows out from the nozzle 14 while rotating the rotary table 10 at a required speed, and thus rotating the shell 2 adsorbed on the upper surface of the rotary table 10 at the required speed, and thus the top wall 4 of the shell 2. A synthetic resin material is supplied in an annular shape to the inner peripheral edge.

シェル２に供給されるライナー素材は加熱されることによって硬化されると共に発泡されるものであり、液状ポリオール、液状ポリイソシアネート及び熱膨張性中空粒子を含むものである。かようなライナー素材の詳細については上記特許文献１を参照されたい。 Liner material supplied to the shell 2 is intended to be foamed while being cured by heating, Ru der those containing liquid polyols, liquid polyisocyanate and thermally expandable hollow particles. For details of such a liner material, see Patent Document 1 above.

本発明のライナー成形方法の好適実施形態においては、上記スピンライニング工程の後に図２及び図３に示す加熱・型押工程が遂行される。この加熱・型押工程においては、図２に示す如く、ライナー素材１６が供給されたシェル２が倒立状態でアンビル１８上に載置される。後述するとおりにしてライナー素材１６を加熱・型押成形することによって形成されるライナーをポリエステル系被覆を介してシェル２に所要とおりに固着するために、シェル２が載置されるアンビル１８を、ポリエステル系被覆のガラス転移温度以上で且つ黄変温度以下、例えばポリエステル系被覆がポリエステル・ブロックイソシアネート被覆である場合には４０乃至２３０℃、に加熱し、これによってシェル２を加熱するのが好適である。   In a preferred embodiment of the liner molding method of the present invention, the heating / pressing step shown in FIGS. 2 and 3 is performed after the spin lining step. In this heating / embossing step, as shown in FIG. 2, the shell 2 supplied with the liner material 16 is placed on the anvil 18 in an inverted state. In order to fix the liner formed by heating and embossing the liner material 16 as described later to the shell 2 through the polyester coating as required, an anvil 18 on which the shell 2 is placed, It is preferable to heat the shell 2 by heating to a temperature not lower than the glass transition temperature of the polyester coating and not higher than the yellowing temperature, for example, 40 to 230 ° C. when the polyester coating is a polyester block isocyanate coating. is there.

加熱・型押工程においては、全体を番号２０で示す型押工具がシェル２内に挿入される。図示の実施形態において使用されている型押工具２０は、円筒形状の型押部材２２と共に、型押部材２２の内側及び外側に夫々に配置されたセンターパンチ２４及び外側スリーブ２６を含んでいる。型押部材２２と共にセンターパンチ２４及び外側スリーブ２６は、ライナー素材１６を加熱するために、熱膨張性中空粒子の発泡開始温度以上で且つ該熱膨張性中空粒子の発泡ピーク温度以下に、例えば熱膨張性中空粒子としてエクスパンセル社から商品名「エクスパンセル０９１ＤＵ」として販売されているものを使用する場合には８０乃至２００℃に加熱されている。かかる加熱は、例えば型押部材２２並びにセンターパンチ２４及び外側スリーブ２６に形成されている熱媒体循環路（図示していない）に加熱された熱媒体を流動することによって好都合に遂行することができる。図２と共に図３を参照して説明を続けると、ライナー素材１６を加熱・型押する際には、型押部材２２の下降に先立って外側スリーブ２６及びセンターパンチ２４が図３に示す位置まで下降されて、外側スリーブ２６の下端及びセンターパンチ２４の下端がシェル２の天面壁４の内面に所要圧力で当接され、かくしてライナー素材１６が外側スリーブ２６とセンターパンチ２４との間に拘束され、ライナー素材１６が半径方向外側及び内側に流動することが阻止される。次いで、型押部材２２が下降されて０．５乃至１０ｋｇ／ｃｍ２の圧力でライナー素材１６に押し付けられる。これによって、ライナー素材１６が図３に示すとおりの形状に型押成形され、そしてまた加熱されることによって硬化され発泡され、かくして所要形状のライナーが形成される。ライナー素材１６に対する型押部材２２の押付圧力が過大になるとライナー素材１６の発泡が不充分になってしまう傾向がある。他方、ライナー素材１６に対する型押部材２２の押付圧力が過小になると、形成されるライナーの表面形状に乱れが発生する傾向がある。ライナー素材１６に対する型押部材２２の押付圧力は、例えば所要弾性偏倚力を有する圧縮ばね（図示していない）を介して型押部材２２をライナー素材１６に作用させることによって、所要値に設定することができる。 In the heating / embossing process, an embossing tool indicated by the whole number 20 is inserted into the shell 2. The embossing tool 20 used in the illustrated embodiment includes a center punch 24 and an outer sleeve 26 disposed inside and outside the embossing member 22, respectively, together with a cylindrical embossing member 22. The center punch 24 and the outer sleeve 26 together with the embossing member 22 are heated to a temperature higher than the foaming start temperature of the thermally expandable hollow particles and lower than the foaming peak temperature of the thermally expandable hollow particles, for example, to heat the liner material 16. when using those sold under the trade name "Expancel 091DU" from Expancell Co. as expanding hollow particles that have been heated to 80 to 200 ° C.. Such heating can be conveniently performed by flowing the heated heat medium into a heat medium circuit (not shown) formed in the embossing member 22 and the center punch 24 and the outer sleeve 26, for example. . 3 and FIG. 3, when the liner material 16 is heated and stamped, the outer sleeve 26 and the center punch 24 are moved to the position shown in FIG. 3 before the pressing member 22 is lowered. The lower end of the outer sleeve 26 and the lower end of the center punch 24 are brought into contact with the inner surface of the top wall 4 of the shell 2 with the required pressure, and the liner material 16 is thus restrained between the outer sleeve 26 and the center punch 24. The liner material 16 is prevented from flowing radially outward and inward. Next, the stamping member 22 is lowered and pressed against the liner material 16 with a pressure of 0.5 to 10 kg / cm 2 . As a result, the liner material 16 is embossed into a shape as shown in FIG. 3, and is also cured and foamed by heating, thus forming a liner of the required shape. If the pressing pressure of the embossing member 22 against the liner material 16 is excessive, foaming of the liner material 16 tends to be insufficient. On the other hand, when the pressing pressure of the pressing member 22 against the liner material 16 becomes too small, the surface shape of the formed liner tends to be disturbed. The pressing pressure of the pressing member 22 against the liner material 16 is set to a required value by causing the pressing member 22 to act on the liner material 16 via a compression spring (not shown) having a required elastic biasing force, for example. be able to.

本発明のライナー成形方法の好適実施形態におけるスピンライニング工程を示す簡略断面図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified cross-sectional view showing a spin lining process in a preferred embodiment of a liner molding method of the present invention. 本発明のライナー成形方法の好適実施形態における加熱・型押工程の初期段階を示す簡略断面図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified cross-sectional view showing an initial stage of a heating / pressing process in a preferred embodiment of a liner molding method of the present invention. 本発明のライナー成形方法の好適実施形態における加熱・型押工程の終期段階を示す簡略断面図。The simplified sectional view showing the final stage of the heating and embossing process in a preferred embodiment of the liner molding method of the present invention.

符号の説明Explanation of symbols

２：シェル
４：シェルの天面壁
６：シェルのスカート壁
１６：ライナー素材
１８：アンビル
２２：型押部材

2: Shell 4: Shell top wall 6: Shell skirt wall 1 6 : Liner material 18: Anvil 22: Embossing member

Claims (3)

天面壁と該天面壁の周縁から垂下する筒状スカート壁とを有する金属製容器蓋シェルの、該天面壁の内面周縁部に、加熱することによって硬化され且つ発泡される、液状ポリオール、液状ポリイソシアネート及び熱膨張性中空粒子を含むライナー素材を、スピンライニング方法によってリング状に供給し、次いで該ライナー素材を加熱して密封用ライナーを成形するライナー成形方法において、
該熱膨張性中空粒子の発泡開始温度以上で且つ該熱膨張性中空粒子の発泡ピーク温度以下に加熱されている型押部材を所要圧力で該ライナー素材に作用させることによって該ライナー素材を所要形状に型押成形しながら加熱する、ことを特徴とするライナー成形方法。 A liquid polyol, a liquid polymer, which is cured and foamed by heating at the inner peripheral edge of the top wall of a metal container lid shell having a top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall. In a liner molding method in which a liner material containing isocyanate and thermally expandable hollow particles is supplied in a ring shape by a spin lining method, and then the liner material is heated to form a sealing liner.
The liner material is shaped into a desired shape by causing a stamping member heated to a temperature higher than the foaming start temperature of the thermally expandable hollow particles and below the foaming peak temperature of the thermally expandable hollow particles to act on the liner material at a required pressure. A liner molding method characterized by heating while embossing. 該型押部材を０．５乃至１０ｋｇ／ｃｍ２の圧力で該ライナー素材に作用させる、請求項１記載のライナー成形方法。 Mold pressing member is allowed to act on the liner material at a pressure of 0.5 to 10 kg / cm 2, a liner molding process of claim 1. 該シェルの内面にはポリエステル系被覆が施されており、該型押部材を該ライナー素材に作用させる際には、該シェルは該ポリエステル系被覆のガラス転移温度以上で且つ該ポリエステル系被覆の黄変温度以下に加熱されたアンビル上に載置される、請求項１又は２記載のライナー成形方法。 The inner surface of the shell is coated with a polyester-based coating. When the embossing member is allowed to act on the liner material, the shell has a glass transition temperature higher than that of the polyester-based coating, and the yellow color of the polyester-based coating. The liner molding method according to claim 1, wherein the liner molding method is placed on an anvil heated to a temperature lower than the temperature change.
JP2006088463A 2006-03-28 2006-03-28 Method for forming a sealing liner in a metal container lid shell Expired - Fee Related JP5000169B2 (en)

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