201247490 六、發明說明： 【發明所屬之技術領域】 本發明，係關於具備有：形成筒狀之本體部、及將該 本體部的開口部予以閉塞之角撐（gusset )部之包裝袋的 製造方法、及藉由如此的製造方法所形成之包裝袋。 【先前技術】 從以往，藉由將塑膠薄膜等之薄片體形成袋狀，來形 成包裝袋。該包裝袋，係收容例如如液體或粉體般地不具 有定形性之內容物。並且，作爲包裝袋，具有獨立性者被 廣泛使用。如此的包裝袋，一般係具備有：形成筒狀之本 體部、及形成包裝袋的底部之角撐部。接著’角撐部，係 可折入於本體部之內側。如此般的包裝袋’係在將內容物 收容之際，藉由內容物之重量上述角撐部會展開，藉以形 成底部。 上述包裝袋，係以如下之方法所製造。首先一開始’ 在形成面狀之本體薄片上，配置用以形成上述角撐部之角 撐薄片。該角撐薄片，係沿著一方向被折彎。接著’將本 體薄片折彎，使本體薄片密合於角撐薄片之一方向的兩端 部。接著，將被折彎的本體薄片之相互重疊之端部彼此熱 密封，而形成筒狀之本體部。更且’將本體部與角撐薄片 熱密封，而形成上述角撐部。藉此’形成如上述般之包裝 袋（參照專利文獻1 )。 〔先前技術文獻〕 -5- 201247490 〔專利文獻〕 專利文獻1:日本特開2004-161288號公報 【發明內容】 〔發明所欲解決之問題〕 如上述般之包裝袋中，本體部，係使本體薄片密合於 角撐薄片之一方向的兩端部地被折彎，所形成。藉此，可 防止內容物從本體薄片之折彎部分與角撐薄片之間漏出。 然而’在將角撐薄片配置於本體薄片上之際，有時於角撐 薄片被配置之位置會產生位移。並且，有時於角撐薄片之 尺寸大小也會產生不齊。在該等之情況，有可能角撐薄片 會與本體薄片之折彎位置重疊。該情況下，有可能無法適 當地進行本體薄片之折彎，而無法形成本體部。並且，也 有可能在本體部與角撐薄片之間會產生空隙。因此，在製 造如上述般的包裝袋之際，需要以細小的精度來控制角撐 薄片之配置位置和角撐薄片之尺寸大小。因此，包裝袋之 製造製程則變得煩雜。加上，對於包裝袋易於發生不良品 〇 因此，本發明之課題，係提供：在形成包裝袋之際， 角撐薄片並不會與本體薄片之折彎位置重疊，可確實地形 成包裝袋之包裝袋的製造方法。並且，本發明之課題，係 提供：以其方法所製造之包裝袋。加上，本發明之課題， 係提供：可得到本體部與角撐薄片之間的密合性優異的包 裝袋之包裝袋的製造方法。並且，本發明之課題，係提供 -6- 201247490 :以如此之方法所製造之包裝袋。 〔用以解決問題之手段〕 本發明之包裝袋的製造方法，係具備有：將形成面狀 之本體薄片沿著一方向折彎而將端部彼此直接地或間接地 予以連結而形成筒狀之本體部、及將形成在該本體部的端 部之開口部予以閉塞，並且可朝向本體部之內側折入之角 撐部，其特徵爲··以形成上述角撐部地，使沿著一方向被 折彎的角撐薄片之一方向、與上述本體薄片之一方向以大 致呈正交之方式，將角撐薄片配置在本體薄片上；然後以 使本體薄片之折彎線從角撐薄片朝側方離間地，將本體薄 片折彎而形成內包角撐薄片之本體部；然後 將角撐薄片與本體部予以密封而形成上述角撐部，並 且將本體部中之本體薄片被折彎所形成之端部與角撐薄片 之間的區域之本體部的內面彼此予以密封。 根據上述之結構，以使本體薄片之折彎線從角撐薄片 朝側方離間地將本體薄片折彎。接著’形成內包角撐薄片 之本體部。因此，在將角撐薄片配置於本體薄片上之際即 使爲產生位移等之情況，角撐薄片也不會重疊於本體薄片 之折彎位置。因而，可適當地進行本體薄片之折彎。因此 ，並不會受到角撐薄片之位移等的影響而可形成本體部。 又，所謂側方，係謂從本體薄片中之與一方向正交之另一 方向的中心位置朝向另一方向的端部之方向。 並且，在將內包角撐薄片之本體部形成之狀態下’將 201247490 角撐薄片與本體部予以密封。藉此，可形成上述角撐部。 並且，將本體部中之本體薄片被折彎所形成之端部與角撐 薄片之間的區域之本體部的內面彼此予以密封。藉此，可 提高本體部與角撐薄片之間的密合性。 具體上，以使本體薄片之折彎線從角撐薄片朝側方離 間地將本體薄片折彎而形成本體部。因此，本體部中之本 體薄片被折彎所形成之端部與角撐薄片之間的區域，係成 爲只有本體薄片被疊層之狀態（本體部之內面彼此對峙之 狀態）。因此，藉由將上述的區域中之本體部的內面彼此 予以密封，上述的區域之本體部則成爲密合於角撐薄片的 端部之狀態。藉此，可提高本體部與角撐薄片之間的密合 性。並且，可提高上述的區域之剛性。因此，在將內容物 收容於包裝袋之際可良好地維持角撐薄片近旁之形狀。 並且，上述本體薄片，係以沿著一方向於兩處被折彎 而形成上述本體部之方式所構成，且上述角撐薄片，係在 本體薄片被折彎之際以位於兩處的折彎線之間之方式被配 置於本體薄片上，較爲理想。 並且，本發明之包裝袋，其特徵係使用上述所記載之 包裝袋的製造方法所形成。 〔發明之效果〕 如上所述，根據本發明，在形成包裝袋之際，角撐薄 片並不會與本體薄片之折彎位置重疊。藉此，可確實地形 成包裝袋。加上，可得到本體部與角撐薄片之間的密合性 -8- 201247490 優異之包裝袋。 【實施方式】 〔發明之實施形態〕 以下，參照第1〜4圖說明關於本發明之實施形態。 本實施形態之包裝袋的製造方法，係如第1(a) 、( b) 圖所示，將可收容液體或粉體等之不具有定形性的內容物 等之包裝袋1形成之方法。包裝袋1，係具備有：形成筒 狀之本體部2、及將形成在該本體部2的端部之開口部2d 予以閉塞之角撐部3。角撐部3,係可朝向本體部2之內 側折入。並且，包裝袋1，係使用具有柔軟性之薄片體（ 後述之本體薄片21及角撐薄片31)所形成》 作爲形成包裝袋1的薄片體之素材，係並非特別被限 定者，而可因應內容物之性狀等而作適當選擇。例如，可 使用尼龍、聚乙烯、聚丙烯、聚對苯二甲酸乙二酯其他的 軟質塑膠之薄膜' 以及鋁其他的金屬之薄膜等。並且，亦 可使用從該等之薄膜任意地選擇而使其疊層者。 並且，薄片體，係可使用於其中一面具有密封性者。 具體上，作爲薄片體，係可使用只在被加熱之區域產生密 封性（熱密封性）者。例如，可使用將以藉由加熱來軟化 而顯現密封性的樹脂等之密封成分塗敷於其中一面之薄片 體。藉由使用如此之薄片體，在將具有密封性之面彼此相 互重疊的區域加熱之際，在其區域可將薄片體彼此輕易地 密封。又，本實施形態中之「密封」，係意味「熱密封」 -9- 201247490 本體部2’係將形成面狀之本體薄片21沿著一方向折 彎’所形成。具體上，本體部2，係將本體薄片21以具有 密封性之面成爲內側面之方式折彎，所形成。本實施形態 中’本體部2，係藉由將形成四角形狀之本體薄片2 1沿著 端邊折彎，所形成。亦即，在本體部2，沿著一方向（相 當於本體薄片21的一方向之方向）形成有將本體薄片21 折彎所形成之端部（本體折彎端部）2a。本實施形態中， 本體部2’係將本體薄片21沿著一方向於兩處折彎，所形 成’且以兩個本體折彎端部2a空出間隔而相對向之方式 ，所形成。亦即，本實施形態中，本體部2，係在未收容 內容物之狀態下，形成平面視四角形狀。 並且’本體部2，係藉由將本體薄片21折彎而將端部 彼此直接或間接地連結，而形成筒狀。本實施形態中，本 體部2，係藉由將本體薄片21之相互重疊的端部彼此密封 ，而形成筒狀。即，本體薄片21之相互重疊的端部彼此 ’係直接地被連結。接著，本體部2，係具有將本體薄片 21之相互重疊的端部彼此密封而形成之本體密封部si。 該本體密封部S1，係藉由在本體薄片21之相互重疊的端 部之具有密封性的面彼此對峙之狀態下被密封（被背貼） ’所形成。亦即，本體部2，係具備有成爲背貼部之本體 密封部S1»該本體密封部S1，係沿著本體部2之一方向 而形成（帶狀）。並且，本體密封部S1，係形成在本體 折彎端部2a、2a間之區域’具體上，形成在本體折彎端 -10- 201247490 部2a、2a間之大致中央部。並且，本體部2，係在本體折 彎端部2a、2a間’以不具有本體密封部si之薄片壁（以 下’記爲前側薄片壁2b)、與具有本體密封部S1之薄片 壁（以下’記爲後側薄片壁2c )相對向之方式，所形成。 接著’在本體部2之一方向的兩端部，形成有開口部2d。 又’以下，將本體部2之一方向（即，本體薄片21 之一方向）也記載爲上下方向。並且，本體部2之中，將 未形成本體密封部S1之側也記載爲前側，且將形成有本 體密封部S 1之側也記載爲後側。並且，在本體部2中， 係將從本體折彎端部2 a、2 a間之中心位置朝向本體折彎 端部2a之方向也記載爲側方。並且，在本體薄片21中， 係將從正交於一方向的另一方向（寬幅方向）之中心位置 朝向寬幅方向的端部之方向也記載爲側方。並且，在角撐 薄片31中，係將從一方向之中心位置朝向一方向的端部 之方向也記載爲側方。 角撐部3，係將形成在本體部2的端部之開口部2d ( 具體上’下端側之開口部2d )予以閉塞。並且，角撐部3 ’係使用沿著一方向被折彎之角撐薄片31所形成。並且 ’角撐部3，係藉由將角撐薄片3 1與本體部2密封，所形 成。本實施形態中，角撐薄片3 1，係將形成四角形狀之薄 片體沿著端邊折彎成兩個，所形成。並且，角撐薄片3 1， 係以具有密封性之面成爲外側面之方式，被折彎》 並且，將角撐薄片31折彎所形成之端部，係位於本 體部2之內側（具體上，上端側）。並且，將角撐薄片3 1 -11 - 201247490 折彎所形成之端部，係配置在開口部2d 將角撐薄片31之端部（被折彎所形成之 )與本體部2之內面在預定之區域予以密 口部2d予以閉塞。接著，形成可朝向本| 入之角撐部3。藉此，在將內容物收容於1 之際，被折入的狀態之角撐部3會展開。 的角撐部3，在包裝袋1形成有底部3。接 之下端部，形成有藉由將本體部2與角撐 封所形成之角撐密封部S2。藉由形成角箱 將收容內容物後之包裝袋1載置於平面上 撐密封部S2來維持包裝袋1之立起狀態 部S2可發揮作爲腳部之功能。此時，底 部3)，係不會挨靠於載置面。 並且，在包裝袋1中的本體部2之比 側方側之區域’形成有將本體部2之對峙 之側方側密封部S3»該側方側密封部S3 撐薄片31之一方向的端部更側方位置。 封部S 3，係沿著上下方向所形成。並且 S3’係沿著角撐薄片31之一方向的端部 ’側方側密封部S 3，係沿著角撐薄片3 1 之整個區域而形成帶狀。 又，本體部2的上端側之開口部2(1， 於包裝袋1內之後，能以各種方法（未圖 如，亦可將密閉該開口部2d之拉鏈構件3 之內側。接著， 端部以外的端部 封。藉此，將開 瞜部2之內側折 拉裝袋1的內側 接著，藉由展開 ;著，在包裝袋1 薄片3 1予以密 赛密封部S 2，在 之際，可藉由角 。即，角撐密封 部3 (即，角撐 ，角撐薄片31更 的內面彼此密封 ，係形成在比角 並且，側方側密 ，側方側密封部 所形成。具體上 之一方向的端部 係將內容物收容 示）來密閉。例 t裝於開口部2d -12- 201247490 。或，亦可將該開口部2d藉由熱密封來密閉。 其次，藉由本實施形態之包裝袋的製造方法，來說明 關於形成如上述般的包裝袋1之流程。本實施形態之製造 方法中，如第2圖所示，係使用使一方向成爲長邊地形成 長條狀之本體薄片21。並且，本實施形態之製造方法中， 係一面將該本體薄片21沿著長邊方向搬運一面形成包裝 袋1。 並且，本實施形態之製造方法中，係使用沿著一方向 被折彎之角撐薄片31。具體上，使用將形成四角形狀之薄 片體沿著端邊（沿著一方向之端邊）折彎成兩個者。或， 使用在形成四角形狀之薄片體被折彎之際將相互重疊之端 部彼此連結而形成筒狀者。並且，形成角撐薄片31之薄 片體，係於與本體薄片21相接之面（外側面）具有密封 性。又，本實施形態中，係使用形成筒狀之角撐薄片3 1。 藉由使用該角撐薄片31，在將角撐薄片31配置於本體薄 片2 1上之際，可良好地維持角撐薄片3 1之折彎狀態。 接著，將角撐薄片31配置在本體薄片21上（具體上 ，具有密封性之面上）。在將角撐薄片31配置在本體薄 片21上之際，係以本體薄片21之一方向與角撐薄片31 之一方向大致呈正交之方式來配置。藉此，將角撐薄片31 沿著一方向折彎而形成直線狀之角撐折彎端部3 1 a，係變 成與本體薄片21之一方向大致呈正交之狀態。 並且’在將角撐薄片31配置於本體薄片21上之際， 係配置在本體薄片21之中央區域。該中央區域，係將本 -13- 201247490 體薄片2 1沿著一方向折彎之際的折彎線（假想線）L 1、 L1間之區域。並且，中央區域，係在形成包裝袋1之際 成爲前側薄片壁2 b。折彎線L 1、L 1，係在將角撐薄片3 1 配置於本體薄片21上之狀態下藉由將本體薄片21折彎， 所形成。並且’折彎線L1、L1，係形成在從角撐薄片31 朝側方離間之位置。並且，在將角撐薄片31配置於本體 薄片21上之際’係以角撐折彎端部31a位於搬運方向的 上游側之方式所配置。 接著’被配置在本體薄片21上之角撐薄片31中之與 本體薄片21相接之面，係被密封於本體薄片21。具體上 ，角撐薄片31中之與本體薄片21相接之面的端部（角撐 折彎端部31a以外之端部），係被密封於本體薄片21。更 詳細之’角撐薄片31，係將與角撐折彎端部31a相對向之 沿著一方向的端部之整個區域、及側方的兩端部之整個區 域密封於本體薄片21 (具體上，成爲前側薄片壁2b之區 域）。接著，藉由如此地被密封，可形成形成包裝袋1之 際的前側之角撐密封部S2。並且，藉由如此地被密封， 而在本體薄片21之搬運時可防止角撐薄片31會從本體薄 片21浮起之情況。並且，藉由如此地被密封，而可確實 地進行將角撐薄片31配置於本體薄片21上之際的定位。 配置有角撐薄片31之本體薄片21，係以使折彎線L1 、L 1從角撐薄片3 1朝側方離間地被折彎。藉此，本體薄 片21，係形成筒狀。具體上，配置有角撐薄片31之本體 薄片2 1，係一面朝搬運方向被搬運，一面在折彎線L1、 -14- 201247490 L1之位置被折彎。接著，該本體薄片21，係將相 之端部21a、21a彼此予以密封而形成本體密封部 ，背貼部）。藉此，本體薄片2 1 ’係形成筒狀（詳 扁平的筒狀）。接著，形成本體折彎端部2a、2a、 片壁2b及後側薄片壁2c。並且’形成內包有角撐i 之本體部2。 並且，藉由以使折彎線LI、L1從角撐薄片31 離間地將本體薄片21折彎，而在形成本體部2之 本體折彎端部2a與角撐薄片31 (具體上，角撐薄戶 一方向的端部）之間，形成有本體部2的內面彼此 區域（內面對峙區域）R。亦即，內面對峙區域R 形成本體部2的前側之本體薄片2 1與形成後側之 片21之間並無介在角撐薄片31之區域。本實施形 內面對峙區域R，係沿著本體部2之一方向（即， 成包裝袋1之際的上下方向）而形成帶狀。並且， 峙區域R，係沿著角撐薄片31之一方向的端部所 本實施形態中，內面對峙區域R，係沿著角撐薄片 一方向的兩端部所形成。 內包有角撐薄片31之本體部2,係將內面與角 3 1密封。具體上，本體部2，係將後側薄片壁2c 與角撐薄片3 1之端部（角撐折彎端部3 1 a以外之 在預定之區域予以密封。更詳細之，係將角撐薄片 與角撐折彎端部31a相對向之位置的端部之整個區 一方向的兩端部之整個區域密封於本體薄片21 (具 互重疊 S1 (即 細爲， 前側薄 蓴片31 朝側方 際，在 Γ 31之 對峙之 ，係在 本體薄 態中， 沿著形 內面對 形成。 3 1之 撐薄片 之內面 端部） 3 1之 域、及 體上’ •15- 201247490 成爲後側薄片壁2c之區域）。藉此，可形成形成包裝袋1 之際的後側之角撐密封部S2。 並且，形成後側之角撐密封部S2之同時，將本體折 彎端部2a與角撐薄片31之間的區域之本體部2的內面彼 此予以密封。換言之，如第3圖所示，將形成內面對峙區 域R之本體部2的內面彼此予以密封。接著，藉由如此地 將內面對峙區域R予以密封，可形成形成包裝袋1之際的 側方側密封部S 3。本實施形態中，係將角撐薄片3 1的端 部與後側薄片壁2c之密封、及內面對峙區域R的整個區 域之密封一體地進行。藉此，可同時地形成角撐密封部 S2及側方側密封部S3。更且，將角撐薄片31中之與角撐 折彎端部3 1 a相對向之位置的端部（搬運方向下游側的端 部）近旁的本體部2之內面彼此沿著該端部予以密封。亦 即，沿著角撐薄片3 1之角撐折彎端部3 1 a以外的端部之 整個區域將本體部2之內面彼此予以密封。 接著，藉由將在如上述般地內包角撐薄片31之狀態 下被密封之本體部2於預定之位置予以切斷，而形成包裝 袋1。具體上，藉由沿著該本體部2之與一方向正交之另 一方向予以切斷，而形成包裝袋1 »更詳細之，係將比位 於搬運方向下游側之角撐薄片31的端部更搬運方向上游 側之位置、與比角撐薄片31更搬運方向下游側之並無密 封本體部2之位置（非密封區域）之間的區域C沿著另一 方向予以切除。藉此，變成：在本體部2之一方向的一端 部（搬運方向下游側之端部）形成角撐部3，且在一方向 -16- 201247490 的另一端部（搬運方向上游側之端部）形成開口部2d，之 包裝袋1。 如上述般地所形成之包裝袋1，係如第4圖所示，收 容內容物（未圖示）之際的下端部之形狀於平面視（從上 方觀看包裝袋1之狀態）形成大致四角形狀。具體上，藉 由將內容物收容於包裝袋1，而角撐部3之中央區域則變 爲大致四角形狀之角底部32。更且，角撐部3之比中央區 域更靠近本體折彎端部2a、2a側之區域，係於包裝袋i 之內側被折入成大致三角形狀而成爲折入部3 3、3 3。亦即 ，以從角底部32之相對向的一對端部（形成本體折彎端 部2a、2a之側的兩端部）豎起之方式形成一對折入部33 ' 33 > 如上述般地，根據本實施形態之包裝袋的製造方法， 在形成包裝袋之際，角撐薄片並不會與本體薄片之折彎位 置重疊，而可確實地形成包裝袋。加上，可形成本體部與 角撐薄片之間的密合性優異之包裝袋。 即，以使折彎線L 1、L 1從角撐薄片3 1朝側方離間地 將本體薄片21折彎而形成內包角撐薄片31之本體部2。 因此，在將角撐薄片31配置於本體薄片21上之際即使爲 產生位移等之情況，角撐薄片31也不會重疊於本體薄片 21之折彎位置（即，折彎線L1、L1 )。因而，可適當地 進行本體薄片21之折彎。因此，並不會受到角撐薄片31 之位移等的影響而可確實地形成本體部2。 並且，由於以使折彎線L1、L1從角撐薄片3 1朝側方 -17- 201247490 離間地將本體薄片21折彎，而形成本體部2，因此內面對 峙區域R’係成爲只有本體薄片21被疊層之狀態。因此 ，藉由將內面對峙區域R中之本體部2的內面彼此予以密 封’如第3圖所示，角撐薄片31之端部與本體部2中之 內面對峙區域R則成爲密合之狀態。藉此，可提高本體部 2與角撐薄片31之間的密合性。並且，對於在內面對峙區 域R與角撐薄片3 1之間形成空間D之情況，被加熱而軟 化之密封成分會進入空間D而固化。藉此，如此之空間D 則變成被閉塞之狀態，且可更提高本體部2與角撐薄片31 之間的密合性。並且，由於提高內面對峙區域R之剛性， 因此在將內容物收容於包裝袋1之際可良好地維持角撐薄 片3 1近旁之形狀。 又，本發明之包裝袋的製造方法，係並非被限定於上 述實施形態，在不脫離本發明的要旨之範圍可作各種的變 更。並且，亦可任意地採用而搭配上述之複數個實施形態 之構成或方法等（亦可將1個實施形態之構成或方法等適 用於其他的實施形態之構成或方法等）》更且，亦可任意 地選擇下述之各種的變形例之構成或方法等，而採用於上 述的實施形態之構成或方法等。 例如，上述實施形態中，係只沿著角撐薄片31之端 部來形成側方側密封部S 3，但並非被限定於此。亦可將 側方側密封部S3延長至比角撐折彎端部3 1 a更靠近形成 有上端開口部2 d側（搬運方向上游側）。例如，亦可將 側方側密封部S3，沿著本體折彎端部2a延長直到上端開 -18- 201247490 口部2 d »藉由如此地形成側方側密封部s 3，在將內容物 收容於包裝袋1之際，沿著本體折彎端部2a形成柱狀之 側方側密封部S3。藉此，本體部2之剛性及強度會提高 ’且可將包裝袋1良好地維持在豎起之狀態。 並且’在形成角撐密封部S 2及側方側密封部S 3之際 ’亦可將爲比角撐薄片31更搬運方向上游側而從接鄰於 角撐薄片31之一方向的端部之區域到本體折彎端部2a之 區域的本體部2之內面彼此與角撐密封部S2及側方側密 封部S3連續地密封。亦即，亦可將角撐密封部S2中之沿 著角撐薄片3 1之一方向的端部之區域及側方側密封部S 3 往本體部2的上端側之開口部2d側延長。藉由將如此之 區域密封，可將角撐薄片31與側方側密封部S3之分界部 分予以閉塞，且可更提高本體部2與角撐薄片31之密閉 性。 並且，上述實施形態中，係使用形成長條狀之本體薄 片2 1，但並非被限定於此。亦可使用形成預定尺寸大小的 單片體狀之本體薄片。 並且，上述實施形態中，係將本體薄片21在兩處折 彎而形成本體部2，但並非被限定於此。如第5圖所示， 亦可將本體薄片21在1處折彎（進行對折）而形成本體 部2’。具體上，該本體部2’’係將角撐薄片31配置於本 體薄片2 1上之後，以使折彎線L 1從角撐薄片朝側方離間 地將本體薄片21進行對折。接著’將比角撐薄片3 1更位 於側方的本體薄片21之相互重疊的端部21a、21a彼此予 -19- 201247490 以密封。藉此，形成本體密封部si ’而構成筒狀》接著， 在本體部2’，形成有：形成本體折彎端部2a側之內面對 峙區域R、及藉由本體薄片21之相互重疊的端部21a、 21a所形成之內面對峙區域R’。並且，本體部2’中，角撐 薄片31爲位於本體折彎端部2a (具體上，內面對峙區域 R )與本體密封部S 1 ’之間》 並且，上述實施形態中，係藉由進行熱密封，來將各 薄片予以密封，但並非被限定於此。亦可使用接著劑等來 將各薄片予以密封。 並且，上述實施形態中，本體部2，係藉由將本體薄 片2 1之相互重疊的端部彼此予以背貼而形成筒狀，但並 非被限定於此。亦可在使本體薄片21之相互重疊的端部 中之具有密封性的面與不具有密封性的面對峙之狀態下， 將如此的面彼此以接著劑等予以接著來形成筒狀。即，本 體部2，係亦可藉由信封黏貼來形成筒狀。 並且，上述實施形態中，本體密封部S 1，係將本體 薄片2 1之相互重疊的端部彼此予以連結來形成，但並非 被限定於此。亦可在形成本體密封部S1的端部彼此離間 之狀態，或者，端緣彼此抵接之狀態下，使用其他的薄片 體來間接地連結。具體上，將一片之其他的薄片體重疊於 本體薄片21中之離間的狀態，或，端緣抵接的狀態之端 部。接著，亦可藉由將本體薄片21中之該端部與其他的 薄片體予以密封，而介由其他的薄片體來將該端部彼此予 以連結。 -20- 201247490 並且，上述實施形態中，包裝袋1，係在未展開角撐 部3之狀態（未收容內容物之狀態）下，將下端部（角撐 部3側之端部）形成大致四角形狀，但並非被限定於此。 如第6(a)圖所示，亦可爲：將包裝袋1的下端部之角部 以預定的角度切斷成直線狀而形成大致梯形狀之包裝袋1’ 。具體上，亦可在包裝袋Γ的下端部，從比角撐折彎端部 31a更下方位置朝向包裝袋1’的下方形成直線狀之推拔部 4 a ° 或者，如第6(b)圖所示，並非將包裝袋1’之推拔 部4a形成直線狀，亦可形成：形成預定半徑的圓弧狀之 圓弧狀推拔部4b。 【圖式簡單說明】 第1圖，係顯示使用本實施形態之包裝袋的製造方法 所形成之包裝袋之圖。 第2圖，係顯示使用該製造方法到形成包裝袋的流程 之圖、及其一部分放大圖。 第3圖，係第2圖之Χ·Χ斷面圖。 第4圖，係顯示將內容物收容於使用該製造方法所形 成的包裝袋之際的狀態之立體圖。 第5圖，係使用其他的實施形態之包裝袋的製造方法 所形成的包裝袋之寬幅方向之斷面圖。 第6圖，係更進一步，其他的實施形態之包裝袋之正 面圖 -21 - 201247490 【主要元件符號說明】 1 :包裝袋 2 :本體部 2a :本體折彎端部 2 b :前側薄片壁 2c :後側薄片壁 2 d :開口部 3 :角撐部 21 :本體薄片 31 :角撐薄片 L1 :折彎位置 R :內面對峙區域 S 1 :本體密封部 S 2 :角撐密封部 S 3 :側方側密封部 -22201247490 VI. OBJECT OF THE INVENTION: TECHNICAL FIELD The present invention relates to a package including a gusset portion in which a tubular body portion is formed and a gusset portion that closes an opening portion of the body portion is provided. A method, and a package formed by such a manufacturing method. [Prior Art] Conventionally, a packaging bag has been formed by forming a sheet of a plastic film or the like into a bag shape. The package contains contents which are not shaped like, for example, a liquid or a powder. Moreover, as a packaging bag, it is widely used as an independent person. Such a packaging bag generally includes a body portion that forms a cylindrical shape and a gusset portion that forms a bottom portion of the packaging bag. Then, the gusset portion can be folded inside the body portion. Such a packaging bag is formed by arranging the gusset by the weight of the contents when the contents are contained, thereby forming the bottom. The above packaging bags were produced in the following manner. First, at the beginning, a gusset sheet for forming the gusset is disposed on the planar body sheet. The gusset sheet is bent in one direction. Next, the body sheet is bent so that the body sheet is adhered to both end portions in one direction of the gusset sheet. Next, the mutually overlapping end portions of the bent body sheets are heat-sealed to each other to form a cylindrical body portion. Further, the body portion and the gusset sheet are heat-sealed to form the gusset portion. Thus, the package as described above is formed (see Patent Document 1). [Prior Art Document] -5-201247490 [Patent Document] Patent Document 1: JP-A-2004-161288 SUMMARY OF INVENTION [Problems to be Solved by the Invention] In the above-described packaging bag, the main body portion is made. The main body sheet is formed by being bent in contact with both end portions in one direction of the gusset sheet. Thereby, it is possible to prevent the contents from leaking from between the bent portion of the body sheet and the gusset sheet. However, when the gusset sheet is placed on the body sheet, displacement may occur at a position where the gusset sheet is disposed. Further, sometimes the size of the gusset sheet may be uneven. In such cases, it is possible that the gusset sheet will overlap the bent position of the body sheet. In this case, the body sheet may not be properly bent, and the body portion may not be formed. Further, there is a possibility that a gap is formed between the body portion and the gusset sheet. Therefore, in manufacturing the packaging bag as described above, it is necessary to control the arrangement position of the gusset sheet and the size of the gusset sheet with fine precision. Therefore, the manufacturing process of the packaging bag becomes complicated. In addition, the packaging bag is prone to defective products. Therefore, the object of the present invention is to provide that the gusset sheet does not overlap with the bending position of the body sheet when the packaging bag is formed, and the packaging bag can be reliably formed. The manufacturing method of the packaging bag. Further, an object of the present invention is to provide a packaging bag produced by the method. In addition, an object of the present invention is to provide a method for producing a packaging bag which is excellent in adhesion between a main body portion and a gusset sheet. Further, the subject of the present invention is to provide -6-201247490: a package manufactured by such a method. [Means for Solving the Problem] The method for producing a packaging bag according to the present invention includes: forming a planar body sheet in one direction and connecting the end portions directly or indirectly to each other to form a cylindrical shape The main body portion and the gusset portion that is formed to be closed at an opening portion of the end portion of the main body portion and that can be folded toward the inner side of the main body portion is characterized in that the gusset portion is formed to Aligning the gusset sheet on the body sheet in a direction orthogonal to one of the body sheets in one direction, and then bending the line of the body sheet from the gusset The sheet is bent laterally, and the body sheet is bent to form a body portion of the inner gusset sheet; then the gusset sheet is sealed with the body portion to form the gusset, and the body sheet in the body portion is folded The inner faces of the body portions of the regions formed by the bends and the gusset sheets are sealed to each other. According to the above configuration, the body sheet is bent away from the gusset sheet laterally by the bending line of the body sheet. Next, the body portion of the inner gusset sheet is formed. Therefore, even when the gusset sheet is placed on the body sheet, even if displacement or the like occurs, the gusset sheet does not overlap the bending position of the body sheet. Thus, the bending of the body sheet can be appropriately performed. Therefore, the body portion can be formed without being affected by the displacement of the gusset sheet or the like. Further, the side is a direction from the center position of the main body sheet in the other direction orthogonal to one direction toward the end portion in the other direction. Further, the 201247490 gusset sheet and the body portion are sealed while the main body of the inner gusset sheet is formed. Thereby, the above gusset portion can be formed. Further, the inner faces of the body portions of the region between the end portion in which the body sheet is bent in the body portion and the gusset sheet are sealed from each other. Thereby, the adhesion between the body portion and the gusset sheet can be improved. Specifically, the body portion is formed by bending the body sheet from the gusset sheet by bending the body sheet from the gusset sheet. Therefore, the region between the end portion formed by the bending of the body sheet in the main body portion and the gusset sheet is in a state in which only the body sheets are laminated (the inner surfaces of the body portions are opposed to each other). Therefore, by sealing the inner faces of the main body portions in the above-described regions, the main body portion of the above-described region is in a state of being in close contact with the end portions of the gusset sheets. Thereby, the adhesion between the body portion and the gusset sheet can be improved. Moreover, the rigidity of the above region can be improved. Therefore, the shape of the vicinity of the gusset sheet can be favorably maintained when the contents are accommodated in the packaging bag. Further, the main body sheet is formed by being bent at two places in one direction to form the main body portion, and the gusset sheet is bent at two places when the main body sheet is bent. The method between the lines is disposed on the body sheet, which is preferable. Further, the packaging bag of the present invention is characterized in that it is formed by the method for producing a packaging bag described above. [Effects of the Invention] As described above, according to the present invention, the gusset sheet does not overlap the bending position of the body sheet when the packaging bag is formed. Thereby, it can be reliably formed into a package. In addition, the adhesion between the body portion and the gusset sheet can be obtained. -8- 201247490 Excellent packaging bag. [Embodiment] [Embodiment of the Invention] Hereinafter, embodiments of the present invention will be described with reference to Figs. The method for producing a packaging bag according to the present embodiment is a method of forming a packaging bag 1 in which a content such as a liquid or a powder having no shape is contained, as shown in Figs. 1(a) and (b). The packaging bag 1 is provided with a main body portion 2 that is formed in a cylindrical shape, and a gusset portion 3 that closes the opening portion 2d formed at the end portion of the main body portion 2. The gusset portion 3 is foldable toward the inner side of the body portion 2. Further, the packaging bag 1 is formed by using a flexible sheet (the main sheet 21 and the gusset sheet 31 to be described later) as a material for forming the sheet of the packaging bag 1, which is not particularly limited, but can be adapted The traits of the contents are appropriately selected. For example, a film of soft plastic such as nylon, polyethylene, polypropylene, or polyethylene terephthalate, and a film of other metal such as aluminum can be used. Further, it is also possible to use a film which is arbitrarily selected from these films and laminated. Further, the sheet can be used for one of the seals on one side. Specifically, as the sheet, those having a sealing property (heat-sealing property) only in the heated region can be used. For example, a sheet obtained by applying a sealing component such as a resin which is softened by heating to exhibit sealing properties can be used. By using such a sheet, the sheets can be easily sealed to each other in the region thereof while heating the regions where the sealable faces overlap each other. Further, "sealing" in the present embodiment means "heat sealing" -9-201247490. The main body portion 2' is formed by bending a planar body sheet 21 in one direction. Specifically, the main body portion 2 is formed by bending the main body sheet 21 so that the surface having the sealing property becomes the inner side surface. In the present embodiment, the main body portion 2 is formed by bending a body sheet 2 1 having a quadrangular shape along the end edge. That is, in the main body portion 2, an end portion (body bent end portion) 2a formed by bending the main body sheet 21 is formed along one direction (in the direction of one direction of the main body sheet 21). In the present embodiment, the main body portion 2' is formed by bending the main body sheet 21 at two places in one direction, and forming the same as the two main body bent end portions 2a with a space therebetween. That is, in the present embodiment, the main body portion 2 is formed into a plan view shape in a state in which the contents are not accommodated. Further, the main body portion 2 is formed in a tubular shape by directly or indirectly connecting the end portions to each other by bending the main body sheet 21. In the present embodiment, the body portion 2 is formed in a cylindrical shape by sealing the overlapping end portions of the main body sheets 21 to each other. Namely, the mutually overlapping end portions of the body sheet 21 are directly coupled to each other. Next, the main body portion 2 has a body sealing portion si formed by sealing the mutually overlapping end portions of the main body sheet 21 to each other. The main body sealing portion S1 is formed by being sealed (backed up) in a state in which the sealing surfaces of the end portions of the main body sheets 21 which are overlapped with each other are opposed to each other. In other words, the main body portion 2 is provided with a main body sealing portion S1 to be a back surface portion, and the main body sealing portion S1 is formed in a direction along the direction of the main body portion 2 (band shape). Further, the main body sealing portion S1 is formed in a region ′ between the bent end portions 2a and 2a of the main body, and is formed substantially at a central portion between the bent portions -10-201247490 2a and 2a. Further, the main body portion 2 is formed between the main body bent end portions 2a and 2a by a sheet wall having no main body sealing portion si (hereinafter referred to as a front side sheet wall 2b) and a sheet wall having a main body sealing portion S1 (hereinafter 'Remarked as the rear side sheet wall 2c' is formed in a relatively opposing manner. Next, an opening 2d is formed at both end portions in one direction of the main body portion 2. Further, the direction of one of the main body portions 2 (that is, the direction of one of the main body sheets 21) is also referred to as the vertical direction. Further, in the main body portion 2, the side on which the main body seal portion S1 is not formed is also referred to as the front side, and the side on which the body seal portion S1 is formed is also referred to as the rear side. Further, in the main body portion 2, the direction from the center position between the body bending end portions 2a, 2a toward the body bending end portion 2a is also referred to as a side. Further, in the main body sheet 21, the direction from the center position in the other direction (wide direction) orthogonal to one direction toward the end portion in the width direction is also referred to as a side. Further, in the gusset sheet 31, the direction from the center position in one direction toward the end portion in one direction is also referred to as a side. In the gusset portion 3, the opening portion 2d (specifically, the opening portion 2d on the lower end side) formed at the end portion of the main body portion 2 is closed. Further, the gusset portion 3' is formed using the gusset sheet 31 which is bent in one direction. Further, the gusset portion 3 is formed by sealing the gusset sheet 31 from the body portion 2. In the present embodiment, the gusset sheet 31 is formed by bending a thin sheet body having a quadrangular shape into two along the end edges. Further, the gusset sheet 3 1 is bent so that the surface having the sealing property becomes the outer side surface, and the end portion formed by bending the gusset sheet 31 is located inside the main body portion 2 (specifically , upper side). Further, the end portion formed by bending the gusset sheet 3 1 -11 - 201247490 is disposed in the opening portion 2d to form the end portion of the gusset sheet 31 (formed by being bent) and the inner surface of the body portion 2 The predetermined area is closed by the mouth portion 2d. Next, the gusset portion 3 which can be oriented toward the front is formed. Thereby, when the contents are accommodated in 1, the gusset portion 3 in the folded state is deployed. The gusset 3 is formed with a bottom portion 3 in the packaging bag 1. At the lower end portion, a gusset sealing portion S2 formed by enclosing the body portion 2 and the gusset is formed. By forming the corner box, the packaging bag 1 containing the contents is placed on the flat surface of the sealing portion S2 to maintain the standing state of the packaging bag 1. The portion S2 functions as a foot. At this time, the bottom portion 3) does not lean against the placement surface. Further, in the region 'the side of the main body portion 2 of the packaging bag 1 side, the side of the side side sealing portion S3» facing the side of the main body portion 2 is formed in the direction of one of the side side sealing portions S3. The side is more lateral. The seal S 3 is formed along the vertical direction. Further, S3' is an end portion side of the gusset sheet 31, and the side side seal portion S3 is formed in a strip shape along the entire region of the gusset sheet 3 1 . Further, the opening portion 2 (1) on the upper end side of the main body portion 2 can be formed in various ways after the inside of the packaging bag 1 (not shown, the inside of the zipper member 3 of the opening portion 2d may be sealed. Next, the end portion The other end is sealed, whereby the inside of the opening portion 2 of the opening portion 2 is folded and then the inside of the bag 1 is folded, and the sheet 3 1 is sealed in the sealed portion S 2 . The corner joints 3, that is, the gusset seals 3 (i.e., the gussets, the inner faces of the gusset sheets 31 are sealed to each other, formed at a specific angle, and the side sides are dense, and the side side seal portions are formed. The end portion in one of the upper directions is sealed by the contents. The example t is attached to the opening 2d -12-201247490. Alternatively, the opening 2d may be sealed by heat sealing. In the method of manufacturing the packaging bag of the form, the flow of forming the packaging bag 1 as described above will be described. In the manufacturing method of the present embodiment, as shown in Fig. 2, the one direction is formed into a long strip. The main body sheet 21. Further, in the manufacturing method of the embodiment, one side is The main sheet 21 is conveyed along the longitudinal direction to form the packaging bag 1. Further, in the manufacturing method of the present embodiment, the gusset sheet 31 which is bent in one direction is used. Specifically, a four-corner shape is used. The sheet is bent into two along the end side (the end side along one direction). Or, the ends which overlap each other when the sheet forming the quadrangular shape is bent are formed into a cylindrical shape. Further, the sheet forming the gusset sheet 31 has a sealing property on the surface (outer side surface) that is in contact with the main sheet 21. Further, in the present embodiment, a tubular gusset sheet 3 1 is used. By using the gusset sheet 31, when the gusset sheet 31 is placed on the body sheet 21, the bent state of the gusset sheet 3 1 can be favorably maintained. Next, the gusset sheet 31 is placed on the body sheet 21 Upper (specifically, a surface having a seal). When the gusset sheet 31 is placed on the body sheet 21, the direction of one of the body sheets 21 is substantially orthogonal to one of the gusset sheets 31. To configure. By this, the gusset is thin The sheet 31 is bent in one direction to form a linear gusset end portion 31a, which is substantially orthogonal to one direction of the body sheet 21. And 'the gusset sheet 31 is disposed on the body The sheet 21 is disposed in a central region of the body sheet 21. The central portion is a bending line (imaginary line) L 1 when the body sheet 21 of the present-13-201247490 is bent in one direction. The area between L1 is a front side sheet wall 2b when the packaging bag 1 is formed. The bending lines L1, L1 are in a state in which the gusset sheet 3 1 is placed on the body sheet 21. The lower portion is formed by bending the main sheet 21, and the 'bending lines L1, L1 are formed at positions spaced apart from the gusset sheet 31 toward the side. In addition, when the gusset sheet 31 is placed on the main sheet 21, the gusset end portion 31a is disposed on the upstream side in the conveyance direction. Then, the surface of the gusset sheet 31 disposed on the body sheet 21 that is in contact with the body sheet 21 is sealed to the body sheet 21. Specifically, the end portion of the gusset sheet 31 that is in contact with the body sheet 21 (the end portion other than the corner bent end portion 31a) is sealed to the body sheet 21. More specifically, the gusset sheet 31 is sealed to the body sheet 21 over the entire area of the end portion in the one direction opposite to the gusset bending end portion 31a and the entire end portions of the side portions (specifically Up, it becomes the area of the front side sheet wall 2b). Then, by thus being sealed, the gusset sealing portion S2 on the front side of the packaging bag 1 can be formed. Further, by being sealed in this manner, it is possible to prevent the gusset sheet 31 from floating from the body sheet 21 during conveyance of the body sheet 21. Further, by being sealed as described above, the positioning of the gusset sheet 31 on the main sheet 21 can be surely performed. The body sheet 21 on which the gusset sheets 31 are disposed is such that the bending lines L1, L1 are bent away from the gusset sheets 31 toward the side. Thereby, the body sheet 21 is formed into a cylindrical shape. Specifically, the main body sheet 2 1 on which the gusset sheets 31 are placed is conveyed in the conveyance direction, and is bent at the position of the bending lines L1, -14 - 201247490 L1. Next, the main body sheet 21 is formed by sealing the end portions 21a and 21a of each other to form a body sealing portion and a backing portion. Thereby, the body sheet 2 1 ' is formed into a cylindrical shape (a flat cylindrical shape). Next, the body bent end portions 2a, 2a, the sheet wall 2b, and the rear side sheet wall 2c are formed. And 'the body portion 2 in which the gusset i is wrapped is formed. Further, by bending the body sheet 21 from the gusset sheet 31 by bending the bending lines L1, L1, the body bent end portion 2a of the body portion 2 and the gusset sheet 31 are formed (specifically, the gusset Between the ends of the thin household in one direction, the inner surface of the main body portion 2 is formed in a region (inwardly facing the crucible region) R. That is, there is no region between the body sheet 2 1 which forms the front side of the body portion 2 and the sheet 21 which forms the rear side with the inner region R. The facing region R in the present embodiment is formed in a strip shape along one direction of the main body portion 2 (i.e., in the vertical direction when the packaging bag 1 is formed). Further, the 峙 region R is an end portion in the direction of one of the gusset sheets 31. In the embodiment, the inner facing ridge region R is formed at both end portions in the direction of the gusset sheet. The body portion 2 of the gusset sheet 31 is wrapped to seal the inner surface with the corner 31. Specifically, the main body portion 2 seals the rear side sheet wall 2c and the end portion of the gusset sheet 3 1 (the gusset bent end portion 3 1 a is sealed in a predetermined region. More specifically, the gusset is gusseted The entire area of both ends of the entire area in one direction of the end portion of the sheet and the gusset end portion 31a is sealed to the body sheet 21 (with overlapping S1 (ie, thin, the front side thin sheet 31 is facing side) In the opposite direction, in the thin body of the body, it is formed along the inner surface of the body. 3 1 The inner end of the sheet of the support sheet) 3 1 domain, and the body ' '15- 201247490 becomes A region of the rear side sheet wall 2c. Thereby, the gusset sealing portion S2 at the rear side of the packaging bag 1 can be formed. Further, while forming the rear side gusset sealing portion S2, the body is bent at the end portion The inner faces of the body portions 2 in the region between the 2a and the gusset sheets 31 are sealed to each other. In other words, as shown in Fig. 3, the inner faces of the body portions 2 forming the inner facing crotch region R are sealed to each other. By thus sealing the inner facing region R, the formation of the packaging bag 1 can be formed. The side side seal portion S3. In the present embodiment, the sealing of the end portion of the gusset sheet 31 and the rear side sheet wall 2c and the sealing of the entire inner surface of the gusset region R are integrally performed. The gusset sealing portion S2 and the side side sealing portion S3 can be simultaneously formed. Further, the end portion of the gusset sheet 31 facing the gusset bending end portion 31a (the downstream side in the conveying direction) The inner surface of the body portion 2 in the vicinity of the end portion is sealed along the end portion, that is, the entire portion of the end portion other than the corner end portion 3 1 a of the gusset sheet 3 1 The inner surface of the inner surface portion 2 which is sealed in the state in which the gusset sheet 31 is wrapped as described above is cut at a predetermined position to form the packaging bag 1. Specifically, By cutting the other direction of the main body portion 2 orthogonal to one direction, the packaging bag 1 is formed in more detail, and the end portion of the gusset sheet 31 on the downstream side in the conveying direction is transported more specifically. The position on the upstream side in the direction and the downstream side in the transport direction of the gusset sheet 31 are not sealed. The region C between the positions of the portions 2 (unsealed regions) is cut along the other direction. Thereby, the gusset portion is formed at one end portion (the end portion on the downstream side in the conveyance direction) in one direction of the main body portion 2 3, and the other end portion (the end portion on the upstream side in the conveyance direction) of one direction -16,474,790, the opening portion 2d is formed in the packaging bag 1. The packaging bag 1 formed as described above is as shown in Fig. 4. The shape of the lower end portion when the contents (not shown) are accommodated is formed in a substantially square shape in a plan view (the state in which the packaging bag 1 is viewed from above). Specifically, the contents are accommodated in the packaging bag 1 The central portion of the gusset portion 3 becomes a corner portion 32 having a substantially square shape. Further, the region of the gusset portion 3 closer to the side of the main body bending end portions 2a, 2a than the central portion is folded into a substantially triangular shape inside the packaging bag i to become the folding portions 3 3, 3 3 . That is, a pair of folded portions 33' 33 > are formed so as to stand up from opposite end portions of the corner bottom portion 32 (the both end portions forming the side of the body bent end portions 2a, 2a); According to the method of manufacturing a packaging bag of the present embodiment, when the packaging bag is formed, the gusset sheet does not overlap with the bending position of the main body sheet, and the packaging bag can be reliably formed. In addition, a packaging bag having excellent adhesion between the main body portion and the gusset sheet can be formed. That is, the body sheet 21 is bent by bending the bending lines L1, L1 from the gusset sheet 3 1 sideways to form the main body portion 2 of the inner gusset sheet 31. Therefore, even when the gusset sheet 31 is placed on the body sheet 21, the gusset sheet 31 does not overlap the bending position of the body sheet 21 (i.e., the bending lines L1, L1) even if displacement or the like occurs. . Thus, the bending of the body sheet 21 can be appropriately performed. Therefore, the main body portion 2 can be surely formed without being affected by the displacement of the gusset sheet 31 or the like. Further, since the main body sheet 21 is formed by bending the bending lines L1, L1 from the gusset sheet 3 1 toward the side -17 - 201247490, the inner facing portion R' becomes the body only. The sheet 21 is laminated. Therefore, by sealing the inner faces of the main body portions 2 in the inner facing region R, as shown in Fig. 3, the end portions of the gusset sheets 31 and the inner facing portion R in the body portion 2 become dense. The state of the union. Thereby, the adhesion between the main body portion 2 and the gusset sheet 31 can be improved. Further, in the case where the space D is formed between the inner facing region R and the gusset sheet 31, the heated and softened sealing component enters the space D to be solidified. Thereby, such a space D becomes a state of being closed, and the adhesion between the main body portion 2 and the gusset sheet 31 can be further improved. Further, since the rigidity of the inner facing region R is increased, the shape of the corner piece 3 1 can be favorably maintained when the contents are accommodated in the packaging bag 1. Further, the method for producing the packaging bag of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. Furthermore, the configuration or method of the above-described plural embodiments may be arbitrarily employed (the configuration or method of one embodiment may be applied to other components or methods, etc.). The configuration, method, and the like of the above-described various modifications can be arbitrarily selected, and the configuration, method, and the like of the above-described embodiments can be employed. For example, in the above embodiment, the side side seal portion S 3 is formed only along the end portion of the gusset sheet 31, but the invention is not limited thereto. The side side seal portion S3 may be extended to be closer to the gusset end portion 3 1 a than the gusset end portion 2 d side (upstream side in the conveyance direction). For example, the side side seal portion S3 may be extended along the body bent end portion 2a until the upper end is opened -18-201247490, the mouth portion 2d » by forming the side side seal portion s 3 in this way, the contents are When being accommodated in the packaging bag 1, the columnar side side sealing portion S3 is formed along the body bending end portion 2a. Thereby, the rigidity and strength of the main body portion 2 are improved, and the packaging bag 1 can be satisfactorily maintained in a state of being erected. Further, 'when the gusset sealing portion S 2 and the side-side sealing portion S 3 are formed', the end portion of the gusset sheet 31 in the direction of the conveyance direction and the end portion adjacent to one of the gusset sheets 31 may be used. The inner surface of the main body portion 2 in the region from the region to the body bending end portion 2a is continuously sealed with the gusset sealing portion S2 and the side side sealing portion S3. In other words, the region of the gusset seal portion S2 along the end portion in the direction of the gusset 31 and the side seal portion S 3 may be extended toward the opening portion 2d side of the upper end side of the main body portion 2. By sealing such a region, the boundary portion between the gusset sheet 31 and the side side seal portion S3 can be closed, and the airtightness of the body portion 2 and the gusset sheet 31 can be further improved. Further, in the above embodiment, the long body sheet 2 1 is formed, but the invention is not limited thereto. It is also possible to use a monolithic body sheet which is formed into a predetermined size. Further, in the above embodiment, the main body sheet 21 is bent at two places to form the main body portion 2, but the invention is not limited thereto. As shown in Fig. 5, the body sheet 21 can also be bent at one place (folded in half) to form the body portion 2'. Specifically, the main body portion 2'' is such that the gusset sheet 31 is placed on the main sheet 21, and the bending sheet L1 is folded in half from the gusset sheet toward the side. Then, the mutually overlapping end portions 21a, 21a of the side sheet 21 which are located further than the gusset sheet 3 1 are sealed to each other by -19 - 201247490. Thereby, the main body sealing portion si' is formed to form a tubular shape. Next, the main body portion 2' is formed so as to face the inner side facing region R on the side of the main body bent end portion 2a and overlap each other by the body sheet 21. The inside formed by the end portions 21a, 21a faces the meandering region R'. Further, in the main body portion 2', the gusset sheet 31 is located between the body bent end portion 2a (specifically, the inner facing 峙 region R) and the body sealing portion S 1 '", and in the above embodiment, The sheets are sealed by heat sealing, but are not limited thereto. An adhesive or the like may also be used to seal the sheets. Further, in the above-described embodiment, the main body portion 2 is formed in a tubular shape by overlapping the end portions of the main body sheets 2 which are overlapped with each other, but is not limited thereto. Further, such a surface may be formed in a cylindrical shape by adhering the surfaces to each other in a state in which the sealing surface of the end portions of the main body sheets 21 which overlap each other and the surface which is not sealed. That is, the body portion 2 can also be formed into a cylindrical shape by being stuck by an envelope. Further, in the above-described embodiment, the main body sealing portion S1 is formed by joining the overlapping end portions of the main body sheets 2, but is not limited thereto. Alternatively, in a state in which the end portions forming the body sealing portion S1 are apart from each other, or in a state where the end edges are in contact with each other, other sheets may be indirectly connected. Specifically, another sheet of one sheet is superposed on the detachment state of the main body sheet 21, or the end portion of the state in which the end edge abuts. Then, the end portions of the main sheet 21 can be sealed with other sheets, and the ends can be joined to each other via another sheet. -20-201247490 In the above-described embodiment, the packaging bag 1 is formed in a state in which the gusset portion 3 is not unfolded (the state in which the contents are not accommodated), and the lower end portion (end portion on the gusset portion 3 side) is formed substantially. The shape of the four corners is not limited to this. As shown in Fig. 6(a), the corner portion of the lower end portion of the packaging bag 1 may be cut into a straight line at a predetermined angle to form a substantially rectangular shaped packaging bag 1'. Specifically, in the lower end portion of the package pocket, a linear push-out portion 4 a ° may be formed from a position lower than the gusset bent end portion 31 a toward the lower side of the packaging bag 1 ′ or as in the sixth (b) As shown in the figure, the push-out portion 4a of the packaging bag 1' is not formed linearly, and an arc-shaped push-out portion 4b having an arc shape of a predetermined radius may be formed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a packaging bag formed by using the manufacturing method of the packaging bag of the embodiment. Fig. 2 is a view showing a flow of forming a packaging bag using the manufacturing method, and a partial enlarged view thereof. Figure 3 is a cross-sectional view of Figure 2 of Figure 2. Fig. 4 is a perspective view showing a state in which the contents are housed in a packaging bag formed by the manufacturing method. Fig. 5 is a cross-sectional view in the width direction of a packaging bag formed by using the method for producing a packaging bag according to another embodiment. Fig. 6 is a front view of a package according to another embodiment - 21 - 4774890 [Description of main component symbols] 1 : package 2: body portion 2a: body bent end portion 2 b: front side sheet wall 2c : rear side sheet wall 2 d : opening portion 3 : gusset portion 21 : body sheet 31 : gusset sheet L1 : bending position R : inner facing 峙 region S 1 : body sealing portion S 2 : gusset sealing portion S 3 : Side side seals-22