1298701 、 (1) k 九、發明說明 【發明所屬的技術領域】 本發明是有關罐本體由焊接罐體所形成的罐容器，詳 細來說’有關藉由焊接罐體形成具有口頸部和體部的罐本 體’在口頸部的開口端形成捲曲部，在體部的下端旋緊底 蓋’予以固定，將具備有密封用樹脂製襯片的蓋子可裝卸 地安裝在罐本體的口頸部，能夠用蓋子反覆封啓的罐容器 【先前技術】 習知的金屬製瓶型罐或廣口反覆封啓罐，是以金屬板 材一體成形口頸部與體部在其罐底側旋緊固定底蓋的類型 的構造，以及由金屬板材進行體部和底部的一體成形，在 該體部的開口端側進行縮徑加工來形成口頸部的類型，通 常作爲飲料罐的容器被廣泛使用。 在這種瓶型罐、廣口反覆封啓罐，例如，如日本特開 2003-321039號公報、日本特開2004-2630 6號公報所示，在 口頸部的開口端形成外捲的捲曲部。爲了與該捲曲部貼緊 ，在蓋子的頂板部的內面側，一體地設置了密封用樹脂製 襯片。 【發明內容】 [發明所需解決的課題] 但是，以往硏究的藉由蓋子能夠反覆封啓的罐容器， -4 - 1298701 • (2) ， 不僅是如上述的由金屬板材進行口頸部和體部的一體成形 的無縫罐，並且使用，將金屬板材捲繞爲圓筒狀，而將端 部彼此相互重疊部分進行焊接予以接合的焊接罐體。以往 硏究了，將該焊接罐體的一端成形爲能夠裝卸蓋子的口頸 部的技術。 ' 但是，這種焊接罐體，是將金屬板材的兩端相互重疊 ，進行焊接所構成，所以即使是小型罐，在焊接部形成階 φ 段落差，完全消除該焊接部形成的階段落差極爲困難。因 此，使焊接罐體的一端側成形爲口頸部，將該口頸部的開 口端成爲捲曲部時，在捲曲部的表面上存在有因焊接部所 形成的階段落差。 因此，當在罐子的口頸部安裝蓋子時，在與蓋子的樹 脂製襯片接觸的捲曲部的表面所存在的焊接部的階段落差 會成爲原因，在捲曲部的表面和樹脂和樹脂製襯片的密封 面之間產生間隙，密封性可能會受到損失。 φ 本發明將解決上述問題列爲課題，具體而言，將關於 由焊接罐體形成罐本體的能夠反覆封啓的罐容器，不使生 產性、旋開性能劣化，充分確保口頸部和蓋子的樹脂製襯 片之間的密封性列爲課題。 [用以解決課題的手段] 本發明爲了解決上述課題，藉由將繞成圓筒狀的金屬 板材的端部相互重疊且焊接而成的焊接罐體，形成具有口 頸部與體部的罐本體，在該口頸部的開口端形成捲曲部， -5- 1298701 • (3) • 且在體部的下端旋緊固定著底蓋，將具備有密封用的樹脂 製襯片的蓋子可裝卸地安裝於上述口頸部的罐容器，與上 述樹脂製襯片接觸的上述捲曲部的表面上的上述焊接部所 形成的階段落差，較上述體部上的焊接部所形成的階段落 差更小，並且上述捲曲部的表面的上述焊接部所形成的階 段落差在15〜100 μιη的範圍內，且上述樹脂製襯片的硬度 ，是在根據IS0868 (JIS-K7215)的硬度計（durometer)硬度 φ 的HDA30〜HDA70的範圍。 在本發明，除了上述構造之外，能藉由厚度爲10〜 5 0 μιη的範圍的帶狀樹脂薄膜來覆蓋，上述焊接罐體的焊 接部的至少罐內面側。 [發明效果] 藉由上述本發明的罐容器，在使捲曲部的表面上由焊 接部所形成的階段落差減小在預定範圍內，並且由於樹脂 φ 製襯片在預定範圍內較爲軟化，所以旋開性、生產性不會 受到損失，能夠使樹脂製襯片的貼緊面，與捲曲部的表面 上由焊接部所形成的階段落差的部分的邊角部貼緊，能夠 充分確保捲曲部和樹脂製襯片之間的密封性。 也就是說，在捲曲部的表面上由焊接部所形成的階段 落差（在焊接部的端部所形成的階段部的落差部）越小則密 封性越高。可是，如果小於1 5 μιη，則必須進行過度的成 形，生產性便惡化。相反的，如果大於1 00 μιη，則與樹脂 製襯片之間的間隙變大，則密封性惡化。針對這個問題， -6- 1298701 • (4) ^ 藉由將捲曲部的表面上由焊接部所形成的階段落差調整在 15〜100 μιη的範圍，便能夠兼顧生產性和密封性。 另外，樹脂製襯片的硬度，如果硬度計（durometer)硬 度高於HDA70，則襯片難於在由焊接部形成的階段落差部 分的邊角部貼緊，密封性會惡化。相反的，如果硬度計 (durometer)硬度低於HDA30，因爲襯片在捲曲部的表面過 於貼緊，則旋開性能惡化。針對這個問題，藉由將樹脂製 φ 襯片的硬度調整在HDA30〜HDA70的範圍，能夠兼顧旋開 性能和密封性。 【實施方式】 以下在第1圖顯示本發明的罐容器的一實施例，在第1 圖’顯示了廣口反覆封啓罐，該罐容器1的罐本體2，將金 ® &材捲繞爲圓筒狀的金屬板材的端部相互重疊且焊接所 ί妾合的焊接罐體而一體成形。在該焊接罐體的一端側，形 • 成了，藉由螺紋卡合來安裝金屬製蓋子3的口頸部21，在 另一端側，藉由雙重旋緊方式安裝著底蓋4。在第2圖（Β) ’顯示了安裝底蓋4之前的狀態。在該狀態，在具有焊接 部2 a的焊接罐體的一端側形成口頸部2 1，在另一端形成 β緣部23 (用來旋緊固定底蓋的部分），其中間部分爲體 咅15 22 α在本實施例的罐容器1中，將在焊接罐體的內側所 _入的分離模，向外側擴張，對罐本體2的體部22實施擴 ίΜ力CI工’在體部22的圓周方向形成凹凸部。 在罐本體2的口頸部2 1，在上端的開口端形成向外捲 1298701 • (5) • 的捲曲部2 1 a，在其下方，形成了朝向上方縮徑的傾斜部 2 1 b。在其下方的周壁部形成螺紋部2丨^，在螺紋部2〗〇的 下方’形成環形的邊部2 1 d (用於卡住蓋子的防盜環的部分 )0 針對安裝在罐本體2的口頸部2 1的蓋子3來加以說明， 使用銘合金等所構成的習知的蓋子用金屬板材，成形爲第 2圖（A)所示的形狀來製造蓋子外殼，在將蓋子外殻從上 φ 方覆蓋於罐本體2的口頸部2 1的狀態下，藉由習知的蓋子 安裝裝置（壓蓋機）進行滾壓成形。蓋子3可反覆封啓地 安裝於罐本體2的口頸部2 1，如第1圖所示，具備有從頂板 部3 1的外緣垂下的裙部3 2。在該裙部3 2的上部，形成爲當 碳酸飲料等作爲內容物時排氣用的排氣細縫部3 3，在其下 方的周壁部形成螺紋部3 4，在其螺紋部3 4的下方，形成了 沿著圓周方向交錯設置架橋部和細縫部的弱化部3 5。該弱 化部3 5，是在開封時斷裂的部分，其下方的部分，爲用來 • 顯示開封的防盜環3 6。 另外，在蓋子3的頂板部3 1的內面周邊部，如第2圖 (A)所示，爲對應罐本體2的口頸部21的裙部21a，採用熱 塑性樹脂的射出成形等方法，密封用樹脂製襯片3 7在頂板 部3 1的周圍部分形成環形。較密封用樹脂製襯片3 7形成更 內側的蓋子3的頂板部3 1的中央部分，如第3圖或第4圖所 示，形成了朝罐容器的內側凹下的凹部3 1 a，因此，提高 了相對於罐容器的內壓的頂板部強度，在頂板部外面部與 異物接觸時能夠防止劃傷。 1298701 • (6) 、 如第4圖所示，藉由頂板部3 1的凹部3 1 a的側壁面3 1 b ，如果向捲曲部2 1 a壓下密封用樹脂製襯片3 7的內側面的 話，則能夠提高樹脂製襯片3 7和裙部2 1 a之間的密封性。 用來形成罐本體2的焊接罐體，是以由表面處理鋼板 等所構成的習知的製罐用金屬板材作爲材料，在該金屬板 * 的除了預定焊接部及其周圍部分的部分的兩面部，將聚對 苯二甲酸乙二醇酯等聚酯類樹脂薄膜（在成爲罐外面側的 φ 聚酯類樹脂薄膜上實施印刷處理）進行層壓後，將其切斷 爲相當於1個罐用量的長方形的坯料後，將其枉料捲繞成 使印刷圖案置於外側，使用電阻焊法將其兩端彼此的重疊 部進行焊接所製造。 因爲對焊接部及其周圍部分的聚酯類樹脂薄膜丨0、i 0 未進行層壓’所以如第5圖所示，爲了覆蓋焊接部2 a及其 周圍部分，使用液體塗料、合成樹脂粉塗裝塗層丨丨，或者 必須黏貼由聚對苯二甲酸乙二醇酯等聚酯類樹脂構成的帶 φ 狀樹脂薄膜1 2。在這種情況下，至少在圓筒狀的焊接罐體 的罐內面側，最好使用帶狀樹脂薄膜i 2來覆蓋焊接部2a ( 及其周圍部分）。 也就是說’在與內容物直接接觸的罐內面側，特別是 因爲要足夠的耐蝕性’必須增厚用來覆蓋焊接部（及其周 圍部分）的保護被膜。可是’在藉由塗裝處理覆蓋該部分 的情況下，如果爲了確保耐蝕性而加厚塗料，則從圓筒狀 的焊接罐體形成口頸部（捲曲部或螺紋部等）時，塗層可 能會發生裂痕、剝離的現象。因此，在罐內面側，最好使 1298701 - (7) ' 用帶狀的樹脂薄膜覆蓋該部分，這樣，在口頸部成形時’ 能夠充分承受對保護被膜的損傷，達到充分的耐蝕性’良 好的內面品質。 用於覆蓋焊接部2a及其周圍部分的帶狀樹脂薄膜1 2 ，在本實施例，雖然是使用聚對苯二甲酸乙二醇酯等聚酯 * 類樹脂薄膜，最好至少由高熔點的上層和低熔點的下層（ 與焊接部貼緊的層）的2層構造。另外，樹脂薄膜的厚度 φ ，因爲如果比1 〇 μπι薄則耐餓性惡化，比5 0 μιη厚則加工 性惡化，所以限定爲1〇〜50 μιη的範圍。 但是，由圓筒狀焊接罐體來進行罐本體2的口頸部2 1 成形時，雖然未進行圖示，而首先，將焊接罐體的一端側 進行拉深加工，在小直徑圓筒狀的口頸部進行縮徑處理後 。在該圓筒狀的口頸部的周壁部，形成螺紋部及其下方的 邊部，並且將其上方部分進一步進行拉深加工，而形成了 :朝向上方縮徑的傾斜部、以及從該傾斜部的上端向上方 φ 立起的圓筒狀的捲曲部預定加工部。藉由將該捲曲部預定 加工部向外側且向下方進行捲曲加工，而形成外捲的捲曲 部。 在本實施例中，在圓筒狀的捲曲部預定加工部，形成 摺疊爲四層的捲曲部2 1 a。具體來說，首先將其上端部分 向外側進行凸緣加工後，將該凸緣加工部分向下方折疊。 隨後，將折疊爲2層的部分再次向外側進行凸緣加工後， 將該凸緣加工部分向下方折疊。再將該折疊爲3層的部分 再次向外側進行凸緣加工後，將該凸緣加工部分向下方折 -10- 1298701 - (8) 疊，形成了折疊爲4層的捲曲部21a。 在本實施例中，上述捲曲部21a的表面（焊接罐體的 罐內面側成爲捲曲部2 1 a的表面）上的焊接部2 a所形成的 階段落差（也就是在焊接部2a的端部所形成的階段部的高 度）’比體部22的焊接部2a所形成的階段落差更小，並且 在15〜100 μπι的範圍（最好爲15〜50 μιη範圍）。具體情形 後面會加以敘述。 | 由作成坯料的金屬板材來製造焊接罐體時，通常，金 屬板的厚度採用約〇. 1 7〜0.23 mm左右的金屬板，在焊接這 種金屬板材的端部彼此（金屬板彼此）時，如第6圖所示， 在金屬板的焊接部2 a的兩側產生階段落差h。具體而言， 例如，如果金屬板的厚度爲0.19mm，則焊接部2a所形成 的階段落差h爲6 0 μπι。該焊接部2 a的階段落差h，如第5 圖所示，即使用帶狀薄膜1 2覆蓋焊接罐體2的焊接部2 a之 後’焊接部2 a所形成的階段落差h仍保持原樣。 • 這種焊接部2 a所形成的階段落差h，在本實施例中， 是調整在15〜100 μιη的範圍。具體而言，在由圓筒狀焊接 罐體所成形的罐本體2的體部2 2的焊接部2 a所形成的階段 落差h爲6 0 μ m，相對的，在捲曲部2 1 a的表面（焊接罐 體的罐內面側爲捲曲部21a的表面）的焊接部2a所形成的 階段落差h爲40 μηι。 相對於成形前的圓筒狀的焊接罐體的外徑，使焊接罐 體的一端側（成爲口頸部的部分）的外徑縮徑約15〜25 %左 右’而減小在捲曲部2 1 a的表面上的焊接部2 a所形成的階 -11 - 1298701 - Ο) 段落差h的尚度’而進入到i 5〜1 0 0 μ m的範圍。在這種情 況下，如果縮徑率低於1 5%，則減少對焊接部2a進行塑性 加工的程度，則無法減少焊接部2a所形成的階段落差h的 高度。相反地，如果縮徑率大於2 5 %，則縮徑部分容易發 生皺折，會增大罐容器的性能惡化的可能性。 另外’作爲在蓋子3的頂板部3 1的內面側所設置的密 封用樹脂製襯片37的材料，能夠使用烯烴類樹脂、聚酯類 • 樹脂、苯乙烯類樹脂、丙烯酸類樹脂等的合成樹脂。例如 ’能使用：乙烯類彈性體添加聚丙烯樹脂、聚酯類彈性體 等。因此，對這些熱塑性樹脂適當添加耐熱穩定劑、抗風 化穩定劑、防粘連劑、抗靜電劑、表面活性劑、增塑劑、 潤滑劑、顏料等添加劑，可用作爲襯片的樹脂材料，關於 使用這種樹脂材料的樹脂製襯片3 7，在本實施例中，是在 根據 IS0868(JIS-K7215)的硬度計（durometer)硬度的 HDA30〜HDA70的範圍。 • 藉由如上述的本實施例的罐容器1，蓋子3的與樹脂製 襯片37接觸的捲曲部21a的表面上的焊接部2a所形成的階 段落差h，是在15〜100 μιη的範圍，並且，樹脂製襯片37 的硬度，在根據IS0868(JIS-K7215)的硬度計（durometer) 硬度的HDA30〜HDA70的範圍，所以由圓筒狀焊接罐體成 形爲罐本體2時，沒有生產性惡化現象，並且，在將安裝 在口頸部2 1上的蓋子3旋開時，沒有旋開性能惡化現象， 能夠充分確保捲曲部2 1 a和樹脂製襯片3 7之間的密封性。 在形成焊接罐體的金屬板的厚度爲0.1〜0.25 mm時， -12- (10) 1298701 、 藉由使在捲曲部2 1 a的表面上的焊接部2a形成的階段落差 h減小至1 5〜5 0 μπι範圍，則沒有生產性惡化現象，能夠確 保更佳的密封性。 在捲曲部2 1 a的表面的由焊接部2a所形成的階段落差 h ’越小則密封性越高，如果小於丨5 μη1的話，則由圓筒 ~ 狀焊接罐體進行具有口頸部2 1的罐本體2成形時，則必須 進行過度的成形，生產性會惡化，另外，如果大於1 0 0 μπι φ ’則在焊接部2a形成的階段落差部分上，捲曲部2 1 a的表 面與樹脂製襯片3 7的密封面之間的間隙會變大，讓密封性 惡化。 另外，樹脂製襯片37的硬度，如果根據IS0868(JIS-K72 15)的硬度計（durometer)硬度高於HDA70，則在襯片部 21a的表面上，則樹脂製襯片37的密封面不易貼緊至由焊 接部2a所形成的階段落差的部分的邊角部，密封性會惡化 。另一方面，如果根據 IS0868(JIS-K7215)的硬度計 φ (durometer)硬度低於HDA30，則因爲襯片37的密封面在捲 曲部2 1 a的表面過於貼緊，則旋開性能會惡化。 以上說明了本發明的罐容器的一實施例，本發明並不 限於上述的實施例所示的具體構成，例如，具備有密封用 樹脂製襯片的蓋子，不限於用金屬製外殼的蓋子，用樹脂 製外殻的蓋子亦可，當然，也可作適當的設計變更。 【圖式簡單說明】 第1圖是本發明的一實施例，顯示廣口反覆封啓罐的 -13- 1298701 、 (11) 整體的側視圖。 第2圖（A)是顯不藉由滾壓成形在罐容器的口頸部所:安 裝之前的狀態的蓋子的局部剖面側視圖，（B)是顯示底蓋 在旋緊固定前的狀態的罐本體的側視圖。 第3圖是將安裝於罐本體的狀態的第2圖 （A)所示的 蓋子的樹脂製襯片附近放大顯示的縱剖面圖。 第4圖是罐容器的蓋子的頂板部的凹部的形狀不同於 p 第3圖的蓋子的其他例子，將蓋子的樹脂製襯片的附近放 大顯示的縱剖面圖。 第5圖是顯示以覆蓋焊接罐體的焊接部的附近的方式 ，設置有保護被膜的狀態的橫剖面圖。 第6圖是顯示將金屬板的端部相互重疊且焊接後的焊 接部的狀態的橫剖面圖。 【主要元件符號說明】 | 1 :罐容爺 2 :罐本體 2 a :焊接邰 3 :蓋子 4 :底蓋 2 1 : 口頸部 21 a :捲曲部 2 2 :體部 3 7 :樹脂製襯片 -14- (12) 1298701 (12) h :階段落差1298701, (1) k Nine, the invention belongs to the technical field of the invention. The present invention relates to a can container formed by a welded can body, and in detail relates to a neck and a body formed by welding a can body. The can body of the part has a curled portion formed at the open end of the neck and neck, and the bottom cover is fastened at the lower end of the body, and the cover having the resin lining for sealing is detachably attached to the neck of the can body. Part, a can container that can be closed by a cover. [Prior Art] A conventional metal bottle type can or a wide-mouth reverse-sealing can is integrally formed with a metal plate and the neck portion and the body are screwed on the bottom side of the can. The configuration of the type of the fixed bottom cover, and the integral forming of the body and the bottom by the metal sheet, and the type of the neck portion is formed by the diameter reduction processing on the open end side of the body, and is generally widely used as a container for the beverage can. . In the case of such a bottle-shaped can, the wide-mouth reverse-sealed can, as shown in Japanese Laid-Open Patent Publication No. 2003-321039, No. 2004-2630 No. 6, the curling of the outer roll is formed at the open end of the neck and neck. unit. In order to be in close contact with the curled portion, a resin lining for sealing is integrally provided on the inner surface side of the top plate portion of the cover. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] However, in the past, the can container which can be repeatedly sealed by the cover, -4 - 1298701 • (2), is not only the neck and neck made of the metal plate as described above. A seamless can formed integrally with the body, and a welded can body in which the metal plate is wound into a cylindrical shape and the end portions are overlapped with each other and welded and joined. In the past, the one end of the welded can body was formed into a technique capable of attaching and detaching the neck portion of the lid. 'However, this welded can body is formed by superposing the two ends of the metal plate on each other and welding. Therefore, even in a small-sized can, a step φ is formed in the welded portion, and it is extremely difficult to completely eliminate the stage where the welded portion is formed. . Therefore, when one end side of the welded can body is formed into a neck portion and the opening end of the neck portion is a curled portion, there is a step difference formed on the surface of the curled portion due to the welded portion. Therefore, when the cover is attached to the neck portion of the can, the step of the weld portion existing on the surface of the curl portion in contact with the resin lining of the cover may be a cause, and the surface of the curl portion and the resin and resin lining A gap is formed between the sealing faces of the sheets, and the sealing property may be lost. φ The present invention solves the above-mentioned problems, and in particular, it is possible to sufficiently ensure the neck and the cover without deteriorating the productivity and the unscrewing performance of the can container which is capable of being repeatedly sealed by forming the can body from the welded can body. The sealing property between the resin lining sheets is a problem. [Means for Solving the Problem] In order to solve the above problems, the present invention forms a can having a mouth neck portion and a body portion by welding a welded can body in which end portions of a cylindrical metal plate material are superposed and welded to each other. The main body has a curled portion at the open end of the neck portion, -5 - 1298701 • (3) • The bottom cover is screwed and fixed to the lower end of the body, and the cover having the resin lining for sealing is detachable The tank container attached to the neck portion and the neck portion has a step difference formed by the welded portion on the surface of the curled portion that is in contact with the resin lining sheet, and is smaller than a step formed by the welded portion on the body portion. And the step of forming the welded portion on the surface of the curled portion is in the range of 15 to 100 μm, and the hardness of the resin liner is in the durometer hardness according to IS0868 (JIS-K7215). φ range of HDA30~HDA70. In addition to the above configuration, the present invention can be covered with a strip-shaped resin film having a thickness of 10 to 50 μm, and at least the inner surface side of the welded portion of the welded can body. [Effect of the Invention] With the can container of the present invention described above, the stage drop formed by the welded portion on the surface of the curled portion is reduced within a predetermined range, and since the resin φ-made lining sheet is softened within a predetermined range, Therefore, the splicing property and the productivity are not lost, and the contact surface of the resin lining can be brought into close contact with the corner portion of the portion of the surface of the curled portion which is formed by the welded portion, and the curl can be sufficiently ensured. The seal between the part and the resin lining. In other words, the smaller the step (formed in the step portion of the step portion formed at the end portion of the welded portion) formed by the welded portion on the surface of the curled portion, the higher the sealing property. However, if it is less than 15 μm, excessive formation must be performed, and productivity is deteriorated. On the other hand, if it is more than 100 μm, the gap with the resin lining sheet becomes large, and the sealing property is deteriorated. In response to this problem, -6- 1298701 • (4) ^ By adjusting the stage drop formed by the welded portion on the surface of the curled portion to a range of 15 to 100 μm, productivity and sealing properties can be achieved. Further, in the hardness of the resin lining sheet, if the hardness of the durometer is higher than that of the HDA 70, it is difficult for the lining sheet to adhere to the corner portion of the step portion formed by the welded portion, and the sealing property is deteriorated. On the contrary, if the hardness of the durometer is lower than that of the HDA 30, since the lining is too close to the surface of the curled portion, the unscrewing performance is deteriorated. In response to this problem, by adjusting the hardness of the resin φ lining in the range of HDA 30 to HDA 70, both the screwing performance and the sealing property can be achieved. [Embodiment] Hereinafter, an embodiment of a can container according to the present invention is shown in Fig. 1. In Fig. 1 ', a wide-mouth reverse sealing can is shown, and the can body 2 of the can container 1 is made of gold® & The ends of the metal sheet wound around the cylindrical shape are overlapped with each other and welded to the welded can body to be integrally formed. On one end side of the welded can body, the neck portion 21 of the metal cover 3 is attached by screwing, and the bottom cover 4 is attached to the other end side by double tightening. The state before the bottom cover 4 is mounted is shown in Fig. 2(Β)'. In this state, the neck portion 2 1 is formed on one end side of the welded can body having the welded portion 2 a, and the β edge portion 23 (the portion for screwing the bottom cover is fastened) is formed at the other end, and the middle portion thereof is a body 咅15 22 α In the can container 1 of the present embodiment, the separation mold inserted into the inside of the welded can body is expanded outward, and the body portion 22 of the can body 2 is subjected to expansion force CI in the body portion 22 The uneven portion is formed in the circumferential direction. In the neck portion 21 of the can body 2, an open portion 1298701 of the upper end is formed, and a curl portion 2 1 a of (5) • is formed, and an inclined portion 2 1 b which is reduced in diameter toward the upper side is formed. A threaded portion 2丨 is formed in a lower peripheral wall portion thereof, and an annular side portion 2 1 d (a portion for blocking the tamper ring of the cover) is formed below the threaded portion 2 针对 for the can body 2 The cover 3 of the neck portion 21 is described, and a cover metal shell is formed by using a conventional metal sheet for a cover made of an alloy or the like, and the shape shown in Fig. 2(A) is used to manufacture the cover outer casing. In the state where the upper φ is covered by the neck portion 21 of the can body 2, roll forming is performed by a conventional cap mounting device (capping machine). The lid 3 can be attached to the neck portion 2 of the can body 2, as shown in Fig. 1, and has a skirt portion 3 2 which is suspended from the outer edge of the top plate portion 31. The upper portion of the skirt portion 3 2 is formed as an exhaust sipe portion 3 3 for exhausting when a carbonated beverage or the like is used as a content, and a screw portion 34 is formed on a lower peripheral wall portion thereof, and is below the screw portion 34 A weakened portion 35 in which the bridging portion and the slit portion are alternately arranged in the circumferential direction is formed. The weakened portion 35 is a portion that is broken at the time of opening, and a portion below it is an anti-theft ring 36 for displaying the opening. In the peripheral portion of the inner surface of the top plate portion 31 of the lid 3, as shown in Fig. 2(A), the skirt portion 21a corresponding to the neck portion 21 of the can body 2 is formed by injection molding of a thermoplastic resin or the like. The resin lining sheet 37 for sealing forms a ring shape at a peripheral portion of the top plate portion 31. The resin-made lining sheet 37 forms a central portion of the top plate portion 31 of the inner cover 3, and as shown in Fig. 3 or Fig. 4, a recess 3 1 a recessed toward the inner side of the can container is formed, Therefore, the strength of the top plate portion with respect to the internal pressure of the can container is improved, and scratching can be prevented when the outer surface portion of the top plate portion comes into contact with foreign matter. 1298701. (6) As shown in Fig. 4, by the side wall surface 3 1 b of the recessed portion 3 1 a of the top plate portion 3 1 , the inside of the sealing resin lining sheet 37 is pressed against the curling portion 2 1 a. On the side, the sealing property between the resin lining sheet 37 and the skirt portion 21a can be improved. The welded can body for forming the can body 2 is made of a conventional metal plate for can making made of a surface-treated steel sheet or the like, on both sides of a portion of the metal plate* excluding a predetermined welded portion and its surrounding portion. In the polyester resin film such as polyethylene terephthalate (printing treatment on the φ polyester resin film on the outer surface side of the can), the film is cut into one equivalent. After the rectangular material of the can is used, the material is wound so that the printed pattern is placed on the outside, and the overlapping portions of the both ends are welded by electric resistance welding. Since the polyester resin film 丨0, i0 of the welded portion and its surrounding portion is not laminated, as shown in Fig. 5, in order to cover the welded portion 2a and its surrounding portion, liquid paint, synthetic resin powder is used. A coating film 丨丨 or a φ-shaped resin film 12 made of a polyester resin such as polyethylene terephthalate must be adhered. In this case, it is preferable to cover the welded portion 2a (and its surrounding portion) using the strip-shaped resin film i 2 at least on the inner surface side of the can of the cylindrical welded can body. That is to say, the protective film for covering the welded portion (and its peripheral portion) must be thickened in the inner side of the can which is in direct contact with the contents, particularly because of sufficient corrosion resistance. However, when the coating is covered by the coating treatment, if the coating material is thickened in order to ensure corrosion resistance, the coating is formed from the cylindrical welded can body when forming the neck portion (curled portion, threaded portion, etc.). Cracks and peeling may occur. Therefore, on the inner surface side of the can, it is preferable to cover the portion with a strip-shaped resin film, so that it can sufficiently withstand damage to the protective film during the formation of the neck and neck, and achieve sufficient corrosion resistance. 'Good internal quality. The strip-shaped resin film 1 2 for covering the welded portion 2a and its peripheral portion is preferably a high-melting point of the polyester resin film such as polyethylene terephthalate in the present embodiment. A two-layer structure of the upper layer and the lower layer of the lower melting point (the layer in close contact with the welded portion). In addition, since the thickness φ of the resin film is thinner than 1 〇 μπι, the hung resistance is deteriorated, and the workability is deteriorated when it is thicker than 50 μm, so it is limited to a range of 1 〇 50 50 μm. However, when the neck portion 2 1 of the can body 2 is formed by the cylindrical welded can body, first, the one end side of the welded can body is subjected to drawing processing, and the cylindrical body of the small diameter is formed, although not shown. After the neck and neck are reduced in diameter. The threaded portion and the lower side portion thereof are formed in the peripheral wall portion of the cylindrical neck portion, and the upper portion thereof is further subjected to drawing processing to form an inclined portion that is reduced in diameter toward the upper side and from the inclined portion. The cylindrical curled portion whose upper end rises upward φ is a predetermined processed portion. The crimped portion of the curled portion is formed by crimping the predetermined portion of the curled portion to the outside and downward. In the present embodiment, the curled portion 21a folded in four layers is formed in the predetermined curled portion of the cylindrical curl portion. Specifically, first, the upper end portion is subjected to flange processing to the outside, and then the flange processed portion is folded downward. Subsequently, after the portion folded into two layers is subjected to flange processing again to the outside, the flange processed portion is folded downward. Further, the portion folded into three layers was subjected to the flange processing again to the outside, and then the flange-finished portion was folded downward by -10 1298701 - (8) to form a curl portion 21a folded into four layers. In the present embodiment, the surface of the curled portion 21a (the surface of the inner surface of the can body which is the surface of the curled portion 21a) is formed by the welded portion 2a (i.e., at the end of the welded portion 2a). The height of the stage portion formed by the portion is smaller than the stage formed by the welded portion 2a of the body portion 22, and is in the range of 15 to 100 μm (preferably in the range of 15 to 50 μm). The specific situation will be described later. When manufacturing a welded can body from a metal plate made of a blank, generally, the thickness of the metal plate is about 0.17 to 0.23 mm, and when the ends of the metal plate are welded to each other (metal plates are mutually) As shown in Fig. 6, a step drop h is generated on both sides of the welded portion 2a of the metal plate. Specifically, for example, if the thickness of the metal plate is 0.19 mm, the stage drop h formed by the welded portion 2a is 60 μm. The stage drop h of the welded portion 2a is as shown in Fig. 5, that is, after the welded portion 2a of the welded can 2 is covered with the strip-shaped film 12, the stage drop h formed by the welded portion 2a remains as it is. • The stage drop h formed by the welded portion 2 a is adjusted in the range of 15 to 100 μm in the present embodiment. Specifically, the stage drop h formed by the welded portion 2 a of the body portion 2 2 of the can body 2 formed by the cylindrical welded can body is 60 μm, and the curl portion 2 1 a is opposed to the curl portion 2 1 a. The stage drop h formed by the welded portion 2a of the surface (the inner surface side of the can body of the welded can body is the surface of the curled portion 21a) is 40 μm. The outer diameter of the one end side of the welded can body (the portion which becomes the neck portion) is reduced by about 15 to 25% with respect to the outer diameter of the cylindrical welded can body before molding, and is reduced in the curl portion 2 The step -11 - 1298701 - Ο formed by the welded portion 2 a on the surface of 1 a is in the range of i 5 to 1 0 0 μ m. In this case, if the reduction ratio is less than 1 5%, the degree of plastic working of the welded portion 2a is reduced, and the height of the step drop h formed by the welded portion 2a cannot be reduced. On the contrary, if the reduction ratio is more than 25%, the reduced diameter portion is liable to wrinkle, which may increase the possibility of deterioration of the performance of the can container. In addition, as the material of the resin lining sheet 37 for sealing provided on the inner surface side of the top plate portion 31 of the lid 3, an olefin resin, a polyester resin, a styrene resin, an acrylic resin or the like can be used. Synthetic resin. For example, 'a vinyl elastomer, a polyester elastomer, or the like can be used. Therefore, additives such as a heat-resistant stabilizer, an anti-weathering stabilizer, an anti-blocking agent, an antistatic agent, a surfactant, a plasticizer, a lubricant, and a pigment are appropriately added to these thermoplastic resins, and can be used as a resin material for a lining sheet. The resin lining sheet 3 of this resin material is in the range of HDA30 to HDA70 according to the durometer hardness of IS0868 (JIS-K7215) in this embodiment. • With the can container 1 of the present embodiment as described above, the stage drop h formed by the welded portion 2a on the surface of the curled portion 21a of the cover 3 which is in contact with the resin lining 37 is in the range of 15 to 100 μm. In addition, the hardness of the resin lining sheet 37 is in the range of HDA30 to HDA70 according to the durometer hardness of IS0868 (JIS-K7215). Therefore, when the cylindrical welding can body is formed into the can body 2, no production is produced. When the cover 3 attached to the neck portion 21 is unscrewed, there is no deterioration of the unscrewing performance, and the sealing between the curl portion 21a and the resin lining sheet 37 can be sufficiently ensured. . When the thickness of the metal plate forming the welded can body is 0.1 to 0.25 mm, -12-(10) 1298701 is reduced to 1 by the step h formed by the welded portion 2a on the surface of the curled portion 2 1 a In the range of 5 to 5 0 μm, there is no deterioration in productivity, and a better sealing property can be ensured. The smaller the stage drop h' formed by the welded portion 2a on the surface of the curled portion 2 1 a is, the higher the sealing property is. If it is smaller than 丨 5 μη1, the neck-shaped welded can body is provided with the neck portion 2 When the can body 2 of 1 is formed, excessive molding must be performed, and productivity is deteriorated. Further, if it is larger than 1 0 0 μπι φ ', the surface of the curled portion 2 1 a is formed on the step portion formed at the welded portion 2a. The gap between the sealing faces of the resin lining sheet 37 becomes large, and the sealing property is deteriorated. Further, if the hardness of the resin lining sheet 37 is higher than that of the HDA 70 according to the hardness of IS0868 (JIS-K72 15), the sealing surface of the resin lining sheet 37 is not easy on the surface of the lining portion 21a. The sealing property is deteriorated by the corner portion of the portion which is in contact with the step formed by the welded portion 2a. On the other hand, if the hardness of the durometer according to the hardness of IS0868 (JIS-K7215) is lower than that of the HDA 30, since the sealing surface of the lining 37 is too close to the surface of the curled portion 21a, the unscrewing performance is deteriorated. . The embodiment of the can container of the present invention has been described above, and the present invention is not limited to the specific configuration shown in the above embodiments. For example, a cover having a resin-made lining is not limited to a cover made of a metal case. It is also possible to use a cover made of a resin outer casing, and of course, it is also possible to make appropriate design changes. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side elevational view showing the entirety of a wide-mouth reverse-sealing can of -13-1298701 and (11). Fig. 2(A) is a partial cross-sectional side view of the cover which is not formed by roll forming in the neck portion of the can container: the state before the mounting, and (B) shows the state before the bottom cover is screwed and fixed. Side view of the can body. Fig. 3 is a vertical cross-sectional view showing the vicinity of a resin lining of the lid shown in Fig. 2(A) in a state of being attached to the can body. Fig. 4 is a longitudinal cross-sectional view showing the shape of the concave portion of the top plate portion of the lid of the can container different from that of the lid of Fig. 3, and showing the vicinity of the resin lining sheet of the lid. Fig. 5 is a cross-sectional view showing a state in which a protective film is provided so as to cover the vicinity of the welded portion of the welded can body. Fig. 6 is a cross-sectional view showing a state in which the end portions of the metal plates are overlapped with each other and the welded portions are welded. [Main component symbol description] | 1 : Canister 2: Can body 2 a : Soldering 邰 3 : Cover 4 : Bottom cover 2 1 : Mouth neck 21 a : Curl 2 2 : Body 3 7 : Resin lining Piece-14- (12) 1298701 (12) h : stage drop