JP4537020B2

JP4537020B2 - Manufacturing method of free-standing bags

Info

Publication number: JP4537020B2
Application number: JP2003169984A
Authority: JP
Inventors: 真一稲葉; 義則稲川
Original assignee: Kao Corp; Yoshino Kogyosho Co Ltd
Current assignee: Kao Corp; Yoshino Kogyosho Co Ltd
Priority date: 2003-06-13
Filing date: 2003-06-13
Publication date: 2010-09-01
Anticipated expiration: 2023-06-13
Also published as: JP2005001746A

Description

【０００１】
【発明の属する技術分野】
本発明は自立袋の製造方法に関する。
【０００２】
【従来の技術】
特許文献１に記載の如く、ブロー成形されたブローバッグの胴部に印刷を施す技術として、ブローバッグの胴部の扁平面に、その扁平面より狭い押当治具の押当面を押当て、胴部の互いに対向する壁（正面部と背面部）を密接させ、密接させた胴部の正面部に印刷を施すものがある。
【０００３】
【特許文献１】
特開平4-163124（１頁、第５図）
【０００４】
【発明が解決しようとする課題】
従来技術には以下の問題点がある。
▲１▼ブローバッグの胴部の正面部と背面部を密接させてその正面部に印刷を施すのに、押当治具を印刷の開始前から終了後までブローバッグの背面部に押当て続ける必要があり、煩雑である。ブローバッグの胴部の正面部と背面部に両面印刷するときには、片面印刷後にブローバッグを反転して残りの片面印刷を施す必要がある。
【０００５】
▲２▼ブローバッグに施し得る印刷面積は、ブローバッグの胴部の中の扁平面の範囲内で、しかもその扁平面より狭い押当治具の押当面の範囲に限定され、狭い。
【０００６】
尚、従来技術のブローバッグは、バッグ全体を折りたたみ自由にするものでなく、押当治具による押当ての解除後には直ちに３次元状に復元し、内容剤の充填前段階から大きな保管スペースを必要とする。
【０００７】
本発明の課題は、金型成形されて折りたたみ可能にされる自立袋において、袋本体の広い範囲に簡易にラベル等を表示可能にすることにある。
【０００８】
【課題を解決するための手段】
請求項１の発明は、合成樹脂製の袋本体を金型成形し、成形された袋本体が開口を先端に備えるネック部を充填口形成部の上部に連設して備えるものにし、この袋本体を折りたたみ、折りたたんだ袋本体にラベル貼り又は印刷を施す自立袋の製造方法であって、前記袋本体の開口から袋本体の内圧を減圧して袋本体の両側部の稜線部を袋本体の胴部の外側に張り出すことにより平面状に折りたたみ、次いで、この平面状に折りたたんだ袋本体の減容状態を保ったまま、ネック部の充填口形成部に連なる基部をヒートシールして封止し、その後、この平面状の折りたたみ状態で封止された袋本体にラベル貼り又は印刷を施すようにしたものである。
【０００９】
【発明の実施の形態】
自立袋１０は、図１に示す如く、胴部２０と底部３０からなる合成樹脂製の袋本体１１を３次元状（立体状）にブロー成形し、袋本体１１への内容剤の充填前段階で袋本体１１の全体を折りたたみ状態にし得るものである。
【００１０】
袋本体１１は、胴部２０と底部３０からなる内容剤の収容部２１と、胴部２０の上縁部の全巾又は全巾近くに渡る広巾の開口を形成し、内容剤のための充填口２２Ａを形成するための充填口形成部２２とを有し、収容部２１と充填口形成部２２とを肩部２３により滑らかにつなぐように、収容部２１、充填口形成部２２及び肩部２３の全体をブロー成形する。肩部２３は、自立袋１０の側面視（充填口形成部２２の後述するシール部２２Ｂの長手方向に沿って見る方向）で、収容部２１の側から充填口形成部２２の側に向けて逆Ｖ字状をなす如くに狭巾化される。
【００１１】
袋本体１１は、胴部２０が正面部２０Ａ、背面部２０Ｂ、両側面部２０Ｃからなるものとし、ブロー成形により、正面部２０Ａと両側面部２０Ｃの境界に稜線部４１を設け、背面部２０Ｂと両側面部２０Ｃの境界に稜線部４２を設け、正面部２０Ａと底部３０の境界に稜線部４３を設け、背面部２０Ｂと底部３０の境界に稜線部４４を設け、両側面部２０Ｃと底部３０の境界に稜線部４５を設ける。また、袋本体１１は、両側面部２０Ｃの長手方向に沿う中央部にブロー成形金型のパーティングラインに沿う稜線部４６を設け、底部３０の中央部にもブロー成形金型のパーティングラインに沿う稜線部４７を設ける。
【００１２】
自立袋１０は、充填口２２Ａから内容剤を充填した後、充填口形成部２２の正面部２０Ａと背面部２０Ｂをシールバーにより挟圧し、正面部２０Ａと背面部２０Ｂをヒートシール又は超音波シール等により融着して封止する。これにより、充填口形成部２２はシール部２２Ｂになる。
【００１３】
自立袋１０は、ブロー成形時に、胴部２０の上縁側の一部に注ぎ口２４Ａを形成するための注ぎ口形成部２４を成形できる。注ぎ口形成部２４の切断により注ぎ口２４Ａを形成する。
【００１４】
自立袋１０は、袋本体１１の全体を例えば以下の如くに折りたたむ（図２）。底部３０の中央部の稜線部４７を胴部２０の内側に向けて２つ折りし、この２つ折りした底部３０を胴部２０の下部の内側に折り込み、胴部２０を平らにすることにより、底部３０を胴部２０に対し平行に重ね合せるように折りたたむほぼ平面状の折りたたみ形態。両側面部２０Ｃの稜線部４６を胴部２０の外側に張り出すもの（図２（Ａ））と、胴部２０の内側に折り込むもの（図２（Ｂ））がある。稜線部４６を外側に張り出すようにした自立袋１０の方が折りたたみ状態の全厚が薄くなる。
【００１５】
自立袋１０は、界面活性剤0.1％〜50％又は溶剤0.1％〜50％の少なくとも１種以上を成分とする内容剤を入れて製品とした自立袋に用いて好適である。
【００１６】
以下、自立袋の製造手順について説明する（図３〜図５）。自立袋１０は図３、図４に略示した如くの製造ラインにおいて以下の手順で製造される。
【００１７】
(1)袋本体１１の成形工程（図３（Ａ））
合成樹脂製の袋本体１１をダイレクトブロー成形により製造できる。ダイレクトブロー成形は、金型内にパリソンを押出し、パリソンの内部への空気の吹き込みにより円周方向の延伸を行なって袋本体１１を形成する。ダイレクトブロー成形は単層又は積層した樹脂層からなる袋本体１１を形成する。ダイレクトブロー成形による袋本体１１の構成樹脂材料としては、単層のときにはＬＤＰＥ（低密度ポリエチレン）又はＬ−ＬＤＰＥ（直鎖低密度ポリエチレン）又はＨＤＰＥ（高密度ポリエチレン）を採用でき、積層のときには外側層をＨＤＰＥ、内側層をＬＤＰＥ又はＬ−ＬＤＰＥとしても良く、内側層をＨＤＰＥ、外側層をＬＤＰＥとするものも採用できる。
【００１８】
成形された袋本体１１は、空気吹込み開口１２Ａを先端に備える筒状ネック部１２を、前述の充填口形成部２２の上部に連設して備える。
【００１９】
(2)袋本体１１の折りたたみ工程（図３（Ｂ））
成形された袋本体１１の空気吹込み開口１２Ａにバキューム吸引具を挿着し、袋本体１１の内圧を減圧して袋本体１１を減容し、扁平状に折りたたむ。袋本体１１の折りたたみ形態は例えば前述した図２の如くである。
【００２０】
尚、袋本体１１は外力の付加により押圧されて減容され、扁平状に折りたたまれるものでも良い。
【００２１】
(3)袋本体１１のリーク検査工程
袋本体１１を上述(2)で減圧する過程で、バキューム吸引具の配管系に設けた圧力計等により減圧度をチェックすることにより、袋本体１１のリーク検査を行なう。
【００２２】
(4)袋本体１１の封止工程（図３（Ｃ））
折りたたんだ袋本体１１の減容状態を保ったまま空気吹込み開口１２Ａを封止する。本実施形態では、筒状ネック部１２の充填口形成部２２に連なる基部をヒートシール具によってヒートシールし、シール部１２Ｂを形成するとともに、シール部１２Ｂより上部を切断除去する。
【００２３】
(5)袋本体１１のデコレーション工程（図４）。
折りたたみ状態で封止された袋本体１１をデコレーション工程に搬送し、折りたたみ状態にある袋本体１１の表面へのラベルＡの貼着、印刷等を行なう。
【００２４】
図４は袋本体１１に感熱ラベルＡを貼着するラベル貼り機５０を示すものであり、袋本体１１が折りたたみ状態でコンベア５１により搬入される。感熱ラベルＡは、ドラム５２に巻き回されてくり出されるとともに、ドラム５２の周囲を覆うヒータ５３により糊剤を活性化された後、貼着ローラー５４により袋本体１１の胴部２０の正面部２０Ａに加圧されて貼着され、かつカットされる。
【００２５】
感熱ラベルＡとしては、図５（Ａ）に示す如く、ＰＥＴ（ポリエチレンテレフタレート）又はＯＰＰ（延伸ポリプロピレン）からなる基材６１の表面にインキ剤６２及びオーバーコート剤６３を塗工し、基材６１の裏面に熱活性型糊剤６４を塗工したものを採用できる。感熱ラベルＡとして、図５（Ｂ）に示す如く、ＰＥＴ又はＯＰＰの基材６１の裏面に、インキ剤６２及び熱活性型糊剤６４を塗工したものを採用することもできる。
【００２６】
次に、自立袋１０の使用手順は以下の如くである。（図６）。
(1)前述の製造ラインで製造された自立袋１０は、箱７１に箱詰めされて平積み保管される。
【００２７】
(2)自立袋１０は箱７１から搬送ライン７２に供給されて搬送され、袴状の袋保持具７３に投入され、充填機に搬送される。
【００２８】
(3)充填機に到達した自立袋１０は、袋本体１１の充填口形成部２２（シール部１２Ｂ）を切断されて、充填口２２Ａを開封形成される。続いて、袋本体１１を３次元状に膨らませ、充填口２２Ａから内容剤を充填した後、充填口２２Ａを封止する。充填口形成部２２の残存部をヒートシール具によってヒートシールし、シール部２２Ｂを形成する。
【００２９】
本実施形態によれば以下の作用効果を奏する。
▲１▼自立袋１０において、合成樹脂製の可撓袋本体１１を３次元状（立体状）にブロー成形し、袋本体１１への内容剤の充填前段階では袋本体１１の全体を折りたたみ、底部３０を胴部２０に対し平行に重ね合せるように折りたたむ全体ほぼ平面状の折りたたみ状態にて平積み保管でき、内容剤の充填時には袋本体１１を３次元状に復元させて自立可能にする。袋本体１１は、ブロー成形によって全体を薄肉可撓状にされ、従来のフィルムを貼り合わせた袋に比して使用樹脂量は少なく、平積み保管によって保管効率も良い。
【００３０】
▲２▼袋本体１１は、一旦折りたたまれることにより、折りたたみぐせを付与され、平面状の折りたたみ状態をほぼ維持する。従って、折りたたんだ袋本体１１を単に、ラベル貼り機５０（又は印刷機）に供給することで、袋本体１１の胴部２０の正面部２０Ａと背面部２０Ｂを密接させる重なり状態を得て、胴部２０（正面部２０Ａと背面部２０Ｂ）の変形を伴なうことなく、正面部２０Ａの表面の正しい位置に簡易にラベル貼り（又は印刷）を施すことができる。袋本体１１の背面部２０Ｂの表面にラベル貼り（又は印刷）を施すこともできる。
【００３１】
自立袋１０にあっては、袋本体１１を平面状に折りたたんでこれを維持するために、胴部２０の一方に押当治具等を押し当て続ける必要がなく、袋本体１１の正面部２０Ａの表面と背面部２０Ｂの表面に同時にラベル貼り（又は印刷）を施すこともできる。
【００３２】
▲３▼袋本体１１は、全体を平面状に折りたたまれる。従って、袋本体１１の胴部２０（正面部２０Ａと背面部２０Ｂ）のほぼ全域の広い範囲に渡るラベル貼り（又は印刷）を施すことができ、ラベルＡ（又は印刷）の表示面積を広くとることができる。
【００３３】
▲４▼袋本体１１の胴部２０において、上述▲２▼の如くに重なり合う正面部２０Ａと背面部２０Ｂがそれらの境界に稜線部４１、４２をもつことにより、正面部２０Ａと背面部２０Ｂの輪郭をそれらの稜線部４１、４２がきれいに画定するし、正面部２０Ａと背面部２０Ｂがそれらの稜線部４１、４２を介してずれなく密接するものになる。従って、上述▲２▼の胴部２０の変形を伴なわない正しい位置へのラベル貼り（又は印刷）と、上述▲３▼の胴部２０の広い範囲に渡るラベル貼り（又は印刷）の確実を図ることができる。
【００３４】
▲５▼合成樹脂製の可撓袋本体１１を３次元状（立体状）にブロー成形し、成形された袋本体１１を折りたたんで該袋本体１１の開口１２Ａを封止することにより、袋本体１１の折りたたみ状態を維持して保管、搬送でき、内容剤の充填時には袋本体１１を３次元状に膨らませて自立可能にする。袋本体１１は折りたたみにより減容されて保管効率、搬送効率を向上できる。上述▲２▼のラベル貼り（又は印刷）のための袋本体１１の折りたたみ状態の維持の完全を図り、上述▲２▼の胴部２０の変形を伴なわない正しい位置へのラベル貼り（又は印刷）と、上述▲３▼の胴部２０の広い範囲に渡るラベル貼り（又は印刷）の確実を図ることができる。
【００３５】
▲６▼上述▲５▼で折りたたんだ袋本体１１の開口１２Ａを封止することにより、空袋状態での保管、搬送時に、空袋内への異物の侵入を防止できる。上述▲５▼で袋本体１１のブロー成形後、速やかに開口１２Ａを封止することにより、内容剤の充填段階まで袋内部の無菌状態を維持することができる。
【００３６】
▲７▼上述▲５▼で折りたたまれた袋本体１１の減容状態がシール部１２Ｂにより維持されて膨らまないことで、袋本体１１のピンホールの有無を確認できる。
【００３７】
▲８▼感熱ラベルＡを用いることにより、ラベルの貼り付け状態をきれいにできるし、ラベル貼機５０の操作も簡易になる。剥離紙がなくなり、低コストになる。滑りにくいラベル材質を選択することで、自立袋１０を把持し易くすることもできる。
【００３８】
尚、自立袋１０にあっては、以下の作用効果も奏する。
(1)袋本体１１への内容剤の充填口形成部２２は、袋本体１１の胴部２０の上縁の全幅又は全幅近くに渡って設けることができ、内容剤の充填性は良い。
【００３９】
(2)袋本体１１からの内容剤の注ぎ口形成部２４は、袋本体１１のブロー成形時に、胴部２０の一部として成形し、又はブロー成形された胴部２０の上縁の開口部をシールして形成することができる。また、注ぎ口形成部２４は、袋本体１１のブロー成形時に３次元状に成形されるから、閉塞しにくい。
【００４０】
(3)袋本体１１をブロー成形するものであるから、従来の自立袋で必要なフィルムの裁断やフィルムのシールが大幅に省略可能となるため、製造工程は簡易である。
【００４１】
(4)袋本体１１をシートの貼合わせによって構成するものでないから、接着層を介在させた積層樹脂により袋本体１１を構成することを必ずしも必要としない。従って、袋本体１１を単層樹脂により構成することができ、界面活性剤や溶剤を含む内容剤が積層フィルムの接着層に浸透して該積層樹脂の剥離を生ずる等がなく、袋品質の安定を図ることができる。
【００４２】
(5)袋本体１１の胴部２０と底部３０が一体成形され、落下の衝撃に対して強く、割れにくい。
【００４３】
(6)袋本体１１に形成した注ぎ口形成部２４を、袋本体１１の底部３０に平行をなす水平方向に対し0度〜90度、好適には30度〜60度の範囲内、最適には45度で傾けることにより、注ぎ出し易くできる。
【００４４】
(7)袋本体１１に形成した注ぎ口形成部２４を、袋本体１１の外方に突出状にすることを金型設計できることから、その突出形状を自由に構成でき、注ぎ口の突出長を長くしたり、注ぎ口の口幅を広くする等、注ぎ出し易い袋を簡易に製造できる。
【００４５】
尚、本発明の自立袋は、金型成形によるものであれば、ブロー成形によるものに限らず、インジェクション成形によるもの等であっても良い。
【００４６】
【発明の効果】
本発明によれば、金型成形されて折りたたみ可能にされる自立袋において、袋本体の広い範囲に簡易にラベル等を表示できる。
【図面の簡単な説明】
【図１】図１は自立袋を示す斜視図である。
【図２】図２は自立袋の折りたたみ状態の一例を示す斜視図である。
【図３】図３は自立袋の製造工程を示す模式図である。
【図４】図４は自立袋のラベル貼り工程を示す模式図である。
【図５】図５は感熱ラベルを示す模式図である。
【図６】図６は自立袋の使用工程を示す模式図である。
【符号の説明】
１０自立袋
１１袋本体
１２ネック部
１２Ａ開口
１２Ｂシール部
２０胴部
２２充填口形成部
４１、４２、４３、４４稜線部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a self-supporting bag.
[0002]
[Prior art]
As described in Patent Document 1, as a technique for printing on the body of the blow molded blow bag, the pressing surface of the pressing jig narrower than the flat surface is pressed against the flat surface of the blow bag body, There is a technique in which a wall (front portion and back portion) facing each other in the body portion is in close contact, and printing is performed on the front portion of the intimate body portion.
[0003]
[Patent Document 1]
JP 4-163124 (1 page, Fig. 5)
[0004]
[Problems to be solved by the invention]
The prior art has the following problems.
(1) Keep the pressing jig against the back of the blow bag from the start to the end of printing to print the front and back of the body of the blow bag in close contact with each other. It is necessary and complicated. When double-sided printing is performed on the front and back portions of the body of the blow bag, it is necessary to invert the blow bag after single-sided printing and perform the remaining single-sided printing.
[0005]
(2) The printing area that can be applied to the blow bag is limited to the range of the pressing surface of the pressing jig within the flat surface in the body of the blow bag and narrower than the flat surface, and is narrow.
[0006]
In addition, the blow bag of the prior art does not make the whole bag free to fold, but immediately after the release by the pressing jig, it is restored to a three-dimensional shape, and a large storage space is provided from the stage before filling the contents. I need.
[0007]
An object of the present invention is to make it possible to easily display a label or the like over a wide range of a bag body in a self-standing bag that is molded and made foldable.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, a bag body made of a synthetic resin is molded, and the molded bag body is provided with a neck portion provided with an opening at the tip thereof and continuously provided on an upper portion of the filling port forming portion. A method of manufacturing a self-supporting bag in which the body is folded and the folded bag body is labeled or printed, and the internal pressure of the bag body is reduced from the opening of the bag body so that the ridges on both sides of the bag body are Fold out to the outside of the body part to fold it flat , then heat-seal and seal the base connected to the filling port forming part of the neck part while keeping the volume of the bag body folded in the flat state Then, labeling or printing is performed on the bag body sealed in the flat folded state .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the self-supporting bag 10 is obtained by blow molding a synthetic resin bag body 11 including a body portion 20 and a bottom portion 30 into a three-dimensional shape (three-dimensional shape), and before filling the bag body 11 with a content agent. Thus, the entire bag body 11 can be folded.
[0010]
The bag body 11 is formed with a container 21 for the contents comprising the body 20 and the bottom 30 and a wide opening over the entire width of the upper edge of the body 20 or near the entire width, and filling for the contents. The container 21, the filling port forming portion 22, and the shoulder portion so as to smoothly connect the housing portion 21 and the filling port forming portion 22 by the shoulder portion 23. 23 is blow molded. The shoulder portion 23 is directed from the housing portion 21 toward the filling port forming portion 22 in a side view of the self-supporting bag 10 (a direction seen along a longitudinal direction of a seal portion 22B described later of the filling port forming portion 22). It is narrowed to form an inverted V shape.
[0011]
The bag body 11 has a body portion 20 consisting of a front surface portion 20A, a back surface portion 20B, and both side surface portions 20C. By blow molding, a ridge line portion 41 is provided at the boundary between the front surface portion 20A and the both side surface portions 20C. A ridge line portion 42 is provided at the boundary of the surface portion 20C, a ridge line portion 43 is provided at the boundary between the front surface portion 20A and the bottom portion 30, a ridge line portion 44 is provided at the boundary between the back surface portion 20B and the bottom portion 30, and the boundary between the both side surface portions 20C and the bottom portion 30 is provided. A ridge portion 45 is provided. Further, the bag body 11 is provided with a ridge line part 46 along the parting line of the blow molding die at the center part along the longitudinal direction of the both side surface parts 20C, and the parting line of the blow molding die also at the center part of the bottom part 30. A ridge line portion 47 is provided.
[0012]
After the self-supporting bag 10 is filled with the content agent from the filling port 22A, the front portion 20A and the back portion 20B of the filling port forming portion 22 are clamped by a seal bar, and the front portion 20A and the back portion 20B are heat sealed or ultrasonically sealed. Seal by fusing. Thereby, the filling port forming part 22 becomes the seal part 22B.
[0013]
The self-supporting bag 10 can mold the spout forming part 24 for forming the spout 24A in a part of the upper edge side of the body part 20 at the time of blow molding. The spout 24A is formed by cutting the spout forming part 24.
[0014]
The self-supporting bag 10 folds the entire bag body 11 as follows, for example (FIG. 2). The ridge line portion 47 at the center of the bottom portion 30 is folded in two toward the inside of the body portion 20, the folded bottom portion 30 is folded inside the lower portion of the body portion 20, and the body portion 20 is flattened to make the bottom portion A substantially planar folding configuration in which 30 is folded so as to overlap with the body 20 in parallel. There are those that project the ridge line portions 46 of the side surface portions 20C to the outside of the trunk portion 20 (FIG. 2A) and those that are folded inside the barrel portion 20 (FIG. 2B). The total thickness of the self-standing bag 10 in which the ridge line portion 46 projects outward is thinner.
[0015]
The self-supporting bag 10 is suitable for use as a self-supporting bag having a content agent containing at least one of surfactants 0.1% to 50% or a solvent 0.1% to 50% as a product.
[0016]
Hereinafter, the manufacturing procedure of a self-supporting bag is demonstrated (FIGS. 3-5). The self-supporting bag 10 is manufactured by the following procedure on a manufacturing line as schematically shown in FIGS.
[0017]
(1) Molding process of the bag body 11 (FIG. 3A)
The bag body 11 made of synthetic resin can be manufactured by direct blow molding. In the direct blow molding, the bag body 11 is formed by extruding a parison into a mold and stretching in the circumferential direction by blowing air into the parison. In direct blow molding, a bag body 11 made of a single layer or a laminated resin layer is formed. As a constituent resin material of the bag body 11 by direct blow molding, LDPE (low density polyethylene), L-LDPE (linear low density polyethylene) or HDPE (high density polyethylene) can be adopted in the case of a single layer, and outside when laminated. The layer may be HDPE, the inner layer may be LDPE or L-LDPE, and the inner layer may be HDPE and the outer layer may be LDPE.
[0018]
The molded bag body 11 includes a cylindrical neck portion 12 having an air blowing opening 12 </ b> A at the tip thereof and connected to the upper portion of the filling port forming portion 22.
[0019]
(2) Folding process of the bag body 11 (FIG. 3B)
A vacuum suction tool is inserted into the air blowing opening 12A of the molded bag main body 11, the internal pressure of the bag main body 11 is reduced, the bag main body 11 is reduced, and it is folded into a flat shape. The folding form of the bag body 11 is, for example, as shown in FIG.
[0020]
In addition, the bag main body 11 may be pressed and reduced in volume by applying external force, and may be folded flat.
[0021]
(3) Leak inspection process of the bag body 11 In the process of depressurizing the bag body 11 in the above (2), the pressure of the bag body 11 is checked by checking the degree of decompression with a pressure gauge or the like provided in the piping system of the vacuum suction tool. Perform an inspection.
[0022]
(4) Sealing process of the bag body 11 (FIG. 3C)
The air blowing opening 12 </ b> A is sealed while maintaining the volume reduction state of the folded bag body 11. In this embodiment, the base part connected to the filling port forming part 22 of the cylindrical neck part 12 is heat-sealed by a heat sealer to form the seal part 12B, and the upper part from the seal part 12B is cut and removed.
[0023]
(5) Decoration process of the bag body 11 (FIG. 4).
The bag body 11 sealed in the folded state is conveyed to the decoration process, and the label A is attached to the surface of the bag body 11 in the folded state, printed, and the like.
[0024]
FIG. 4 shows a label sticking machine 50 for sticking the thermosensitive label A to the bag body 11, and the bag body 11 is carried in by the conveyor 51 in a folded state. The thermal label A is wound around the drum 52 and activated, and after the paste is activated by the heater 53 that covers the periphery of the drum 52, the front portion of the body portion 20 of the bag body 11 by the sticking roller 54. Pressurized to 20A, stuck, and cut.
[0025]
As the thermal label A, as shown in FIG. 5A, an ink agent 62 and an overcoat agent 63 are applied to the surface of a base material 61 made of PET (polyethylene terephthalate) or OPP (stretched polypropylene), and the base material 61 It is possible to employ a heat activated paste 64 coated on the back surface of the film. As the thermal label A, as shown in FIG. 5 (B), it is also possible to employ an ink agent 62 and a thermally activated paste 64 applied to the back surface of a PET or OPP substrate 61.
[0026]
Next, the procedure for using the self-supporting bag 10 is as follows. (FIG. 6).
(1) The self-supporting bag 10 manufactured in the above-described manufacturing line is packed in a box 71 and stored in a flat stack.
[0027]
(2) The self-supporting bag 10 is supplied from the box 71 to the transport line 72 and transported, put into the bag-shaped bag holder 73, and transported to the filling machine.
[0028]
(3) The self-supporting bag 10 that has reached the filling machine is cut at the filling port forming portion 22 (seal portion 12B) of the bag body 11 and the filling port 22A is opened. Subsequently, the bag body 11 is inflated three-dimensionally, and after filling the content agent from the filling port 22A, the filling port 22A is sealed. The remaining part of the filling port forming part 22 is heat-sealed with a heat sealer to form a seal part 22B.
[0029]
According to this embodiment, there exist the following effects.
(1) In the self-supporting bag 10, the flexible bag body 11 made of synthetic resin is blow-molded into a three-dimensional shape (three-dimensional shape), and the entire bag body 11 is folded at the stage before filling the contents into the bag body 11, The bottom part 30 is folded so as to be overlapped with the body part 20 in parallel. The whole part can be stored in a substantially flat folded state, and the bag body 11 can be restored to a three-dimensional shape and self-supported when the contents are filled. The bag body 11 is made thin and flexible as a whole by blow molding, and the amount of resin used is smaller than that of a bag with a conventional film bonded, and the storage efficiency is good by flat stacking.
[0030]
{Circle around (2)} The bag main body 11 is folded once to be given a folding fold, and substantially maintains a flat folded state. Therefore, by simply supplying the folded bag body 11 to the labeling machine 50 (or printing machine), an overlapped state is obtained in which the front portion 20A and the back portion 20B of the trunk portion 20 of the bag body 11 are brought into close contact with each other. Labeling (or printing) can be easily performed at the correct position on the surface of the front portion 20A without deformation of the portion 20 (the front portion 20A and the back portion 20B). Labeling (or printing) can also be performed on the surface of the back surface portion 20B of the bag body 11.
[0031]
In the self-supporting bag 10, in order to fold the bag body 11 into a flat shape and maintain it, there is no need to keep pressing a pressing jig or the like against one of the body parts 20, and the front part 20A of the bag body 11 It is also possible to apply labeling (or printing) to the front surface and the back surface 20B at the same time.
[0032]
(3) The bag body 11 is folded in a flat shape as a whole. Therefore, labeling (or printing) over a wide range of almost the entire region of the trunk portion 20 (the front portion 20A and the back portion 20B) of the bag body 11 can be performed, and the display area of the label A (or printing) is increased. be able to.
[0033]
(4) In the trunk portion 20 of the bag body 11, the front portion 20A and the rear portion 20B that overlap as described in the above item (2) have the ridge portions 41 and 42 at their boundaries, so that the front portion 20A and the rear portion 20B The ridge line portions 41 and 42 define the outline cleanly, and the front surface portion 20A and the back surface portion 20B come into close contact with each other through the ridge line portions 41 and 42 without deviation. Therefore, the labeling (or printing) in the correct position without the deformation of the barrel 20 of the above-mentioned (2) and the labeling (or printing) over the wide range of the barrel 20 of the above-mentioned (3) are ensured. Can be planned.
[0034]
(5) A flexible bag main body 11 made of synthetic resin is blow-molded into a three-dimensional shape (three-dimensional shape), the formed bag main body 11 is folded and the opening 12A of the bag main body 11 is sealed, thereby 11 can be stored and transported while maintaining the folded state, and the bag body 11 is inflated in a three-dimensional shape to be self-supporting when the contents are filled. The bag body 11 is reduced in volume by folding, so that storage efficiency and transport efficiency can be improved. In order to maintain the folded state of the bag body 11 for labeling (or printing) in the above item (2), labeling (or printing) in the correct position without the deformation of the body part (20) in the above item (2). ) And labeling (or printing) over the wide range of the body 20 of the above-mentioned (3) can be ensured.
[0035]
(6) By sealing the opening 12A of the bag body 11 folded in the above (5), it is possible to prevent foreign matter from entering the empty bag during storage and transport in the empty bag state. After the bag body 11 is blow-molded in the above item (5), the sterilized state inside the bag can be maintained until the filling stage of the content agent by quickly sealing the opening 12A.
[0036]
(7) Since the volume reduction state of the bag body 11 folded in (5) above is maintained by the seal portion 12B and does not swell, the presence or absence of pinholes in the bag body 11 can be confirmed.
[0037]
(8) By using the thermal label A, it is possible to clean the state of label attachment and the operation of the labeling machine 50 is simplified. There is no release paper and the cost is low. By selecting a label material that is not slippery, the self-supporting bag 10 can be easily gripped.
[0038]
In addition, in the self-supporting bag 10, there exist the following effects.
(1) The filling port forming portion 22 of the content agent into the bag body 11 can be provided over the entire width of the upper portion of the trunk portion 20 of the bag body 11 or near the full width, and the filling property of the content agent is good.
[0039]
(2) The spout forming part 24 for the content agent from the bag body 11 is formed as a part of the body part 20 when the bag body 11 is blow-molded, or is an opening at the upper edge of the body part 20 that is blow-molded Can be formed by sealing. Moreover, since the spout formation part 24 is shape | molded in three dimensions at the time of blow molding of the bag main body 11, it is hard to block | close.
[0040]
(3) Since the bag body 11 is blow-molded, the film cutting and film sealing required in the conventional free-standing bag can be greatly omitted, and the manufacturing process is simple.
[0041]
(4) Since the bag body 11 is not configured by bonding sheets, it is not always necessary to configure the bag body 11 with a laminated resin with an adhesive layer interposed. Therefore, the bag main body 11 can be constituted by a single layer resin, and the content agent containing a surfactant or a solvent does not penetrate into the adhesive layer of the laminated film to cause the peeling of the laminated resin, thereby stabilizing the bag quality. Can be achieved.
[0042]
(5) The body portion 20 and the bottom portion 30 of the bag body 11 are integrally formed, and are strong against the impact of dropping and are not easily broken.
[0043]
(6) The spout forming part 24 formed on the bag body 11 is optimally within the range of 0 to 90 degrees, preferably 30 to 60 degrees with respect to the horizontal direction parallel to the bottom 30 of the bag body 11. Can be easily poured by tilting at 45 degrees.
[0044]
(7) Since the spout forming part 24 formed on the bag body 11 can be designed as a mold that protrudes outward from the bag body 11, the protruding shape can be freely configured, and the protruding length of the spout can be increased. Bags that are easy to pour out can be easily manufactured, for example, by increasing the length or by increasing the width of the spout.
[0045]
Note that the self-supporting bag of the present invention is not limited to blow molding, but may be injection molding or the like as long as it is based on mold molding.
[0046]
【The invention's effect】
According to the present invention, in a self-standing bag that is molded and made foldable, a label or the like can be easily displayed on a wide range of the bag body.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a self-supporting bag.
FIG. 2 is a perspective view showing an example of a folded state of a self-supporting bag.
FIG. 3 is a schematic view showing a manufacturing process of a self-supporting bag.
FIG. 4 is a schematic diagram showing a labeling process for a self-supporting bag.
FIG. 5 is a schematic diagram showing a thermal label.
FIG. 6 is a schematic diagram showing a process for using a self-supporting bag.
[Explanation of symbols]
10 Free-standing bags 11 Bag bodies
12 neck
12A opening
12B Seal part 20 Body
22 Filling port forming part 41, 42, 43, 44 Ridge line part

Claims

A synthetic resin bag body is molded, and the molded bag body is provided with a neck portion provided with an opening at the tip thereof and connected to the upper portion of the filling port forming portion, and the bag body is folded and folded. A self-standing bag manufacturing method for labeling or printing on a main body,
The inner pressure of the bag body is reduced from the opening of the bag body, and the ridges on both sides of the bag body are folded out to the outside of the body of the bag body, and folded into a plane.
Next, while maintaining the volume reduction state of the bag body folded in a flat shape, the base portion connected to the filling port forming portion of the neck portion is heat sealed and sealed,
Then, the manufacturing method of the self-supporting bag which labels or prints on the bag main body sealed by this planar folding state .

Method for producing a self-standing bag according to claim 1 which apply the thermal label to the bag body.

Self-standing bag manufactured by the manufacturing method of the self-standing bag according to claim 1 or 2.