JP2004035062A

JP2004035062A - Inner bag for can

Info

Publication number: JP2004035062A
Application number: JP2002195364A
Authority: JP
Inventors: Tetsuya Kawada; 河田　鉄也
Original assignee: Nisshin Sansho Co Ltd
Current assignee: Nisshin Sansho Co Ltd
Priority date: 2002-07-04
Filing date: 2002-07-04
Publication date: 2004-02-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner bag for a can which does not have a wrinkle even when the same is stored in a cone-shaped tapered can whose top face opening is larger than its bottom face, which prevents a content from getting into a seal part or the seal part from coming off, whose material cost is low because a sheet is not thick, and which can be folded in storing or transporting. <P>SOLUTION: This relates to an inner bag to be stored in a tapered can, and the bag comprises a cone-shaped side face member 6 formed by fusing a surface near one side edge 4 with the back face near the other side edge 5 of a sector shaped sheet 1 whose top and bottom sides 2, 3 are arc shaped and both side edges 4, 5 are straight lined and a circular bottom face member 7 fused to the surface of the inwardly folded bottom end of the member 6. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、外容器としての缶の内部に収めた状態で各種液体や粉体の収納や輸送に使用する内袋、更に詳しくは上側開口部が下側底部より大きな円錐状の重ね置き用の缶に収納するための内袋に関するものである。
【０００２】
【従来の技術】
各種液体や粉体の収納保管や輸送を行なう場合、定形性を有し上面が開口した有底状の外容器を利用し、合成樹脂等の可撓性、気密性に優れた材料からなる筒状体の下端を底部で閉鎖した有底状の内袋を前記外容器内に挿入し、内袋の上端部を外容器の開口部外側に折り返し、外容器の上側開口部この内袋に各種液体や粉体等の流動体を収納して外容器の上面開口部を蓋等で閉鎖すれば、外容器の内壁を収納物で汚さず、かつ同内壁に先に付着していた液体や汚れと混ざることなく各種液体や粉体の保存や輸送を行なうことができる。
【０００３】
上記内袋の製法としては、通常、合成樹脂をインシュレーション法により図２に示すような筒状体１０を得て、この筒状体１０を内袋の側面部材として用い、一方端に同じく合成樹脂製の円形の底面部材（図示せず）を溶着等により接合し、缶とほぼ同様の形状の円形の底面部と上面開口部を有する筒状の内袋を得る。
【０００４】
また外容器としては金属、プラスチック等の定形性を有する円筒状の缶が主流であるが、近年、使用しない際の保管の利便性を考慮し、上面開口部の方が下側の底面部より大きな円錐状の缶、例えばバケツのような形状の缶（以下「テーパー缶」という）が用いられるようになってきた。
【０００５】
これらのテーパー缶は、内部から各種液体や粉体を取り出した後に、上面開口部に同形状の他のテーパー缶を収納するようにして上に重ねてゆけば、置き場所をあまり取らずに保管することができるという利点がある。
【０００６】
【発明が解決しようとする課題】
ところで、上記テーパー缶に通常の筒状の内袋を用いる際、缶の底面部と内袋の底面部の寸法を一致させた場合、上面開口部の周囲で内袋を折り返せなくなり、逆に上面開口部の寸法と内袋の寸法を一致させると、内袋の底面部が缶の底まで入り込まなくなってしまう。
【０００７】
そのため、これらのテーパー缶には、図３の（Ａ）〜（Ｃ）に示すような内袋を用いており、（Ａ）は筒状体１０の一方端部をシール部１１により閉鎖して底部としたもの、（Ｂ）は（Ａ）のシールした底を縛ったもの、（Ｃ）は缶の形状に合わせたテーパ状を有する２枚の平面シート１２を貼り合わせて周囲をシール部１１によりシールしたものである。
【０００８】
これらを缶に使用した場合、（Ａ），（Ｂ）のものはテーパー缶に収納した時、底面部および底面部付近の側面部で内袋にシワが生じてしまい、また（Ｃ）のものについても、テーパーを有して上部のほうが大きくなっているが、テーパー缶の内壁に完全に一致することはなくシワを生じるのを防ぐことができない。
【０００９】
内袋にシワが生じると、シワが生じた分だけ収納量が低下してしまうと共に、シワが内袋を出すときの抵抗となりスムーズに取り出すことができないという問題があった。
【００１０】
また、従来の有底状の内袋や図３で示した内袋で使用するシール部１１の構造は、図４に示すように互いのシートの端部を一致させ、シート端部から所定寸法までを溶着させてシール部１１とした構造であるが、この場合、袋小路状となった隙間に液体や粉体の残量が入り込んでしまい、内容物を使い切れないという問題があった。
【００１１】
更に、シール部１１については、内容物が液体の場合、内部からの圧力によりシール部１１を内側から剥がす方向に力が加わり、シール部１１が剥がれてしまうおそれがあった。
【００１２】
一方、真空成型や溶融成型などにより、缶の形状に合わせたテーパー形状を有する内袋を一体成型し、シール部が無く、かつ収納時にシワが生じたりすることがない内袋を製造する方法もある。
【００１３】
しかし、前者の真空成型は平面シートを真空により型引きして形成するもので、シート素材が部分的に延ばされてシート厚が薄くなる部分が生じるため、あまり薄いシートを使用できず、２００〜５００μｍの内袋としては比較的厚めの素材が必要であり、材料コスト的に高くつき、また、厚みがあるため未使用時に折りためないので、内袋のみの保存や輸送時に場所を取るという問題がある。
【００１４】
また、後者の溶融成型は、溶融した材料を型枠内で遠心力によりテーパーを有する筒状に成型するものであるが、これについても厚みの不均一が生じやすく、全体的に厚みを厚くする必要があるため前者と同様の問題を生じていた。
【００１５】
この発明は、上記のような課題を解決するためになされたものであり、テーパー缶に用いてもシワが生じることがなく、またシール部に内容物が入り込んだりシール部が剥がれたりすることがなく、更に、シート厚みが厚くならないので材料コストが安く、保存や輸送時に折りたためるような内袋を提供することを課題とする。
【００１６】
【課題を解決するための手段】
上記のような課題を解決するため、この発明は、上面開口部が底面部より大きな円錐状の缶に収納する内袋であって、上下辺が円弧状で両側辺が直線状の扇形のシートの一方の側辺付近の表面と他方の側辺付近の裏面とを溶着して形成した円錐状の側面部材と、該側面部材の下端部を内側に折り曲げた表面に溶着された円形状の底面部材とからなる缶用の内袋である。
【００１７】
扇形のシートを筒状に丸めて両側辺を溶着して円錐（の途中を切り取った）形状の筒からなる側面部材を形成し、円形状の底面部により側面部材の下面開口部を封鎖すれば、上面開口部が底面部より大きな円錐状の缶にフィットする内袋が得られ、これを同缶内に収納しても、内袋に寸法の余りによるシワが生じない。
【００１８】
また扇形のシートの両側辺及び側面部材と底面部材の接合は、一方の表面と他方の裏面を溶着しているので、溶着したシール部が袋小路にならない。
【００１９】
【発明の実施の形態】
図１（Ａ）はこの発明の内袋を形成する側面部材を構成する扇形のシート１を示すもので、可撓性、気密性を有する合成樹脂等からなる厚み約１００〜１５０μｍ程度の１枚の平面シートを、上辺２及び下辺３が円弧状で、両側辺４，５が直線状の略扇状に切り取ったシートである。
【００２０】
上辺２の円弧の寸法は、テーパー缶の上面開口部の円周寸法より若干大きめで、下辺３の円弧の寸法は、テーパー缶の下面底部の円周より若干大き目としておき、側辺４，５の長さは、テーパー缶の高さより若干大きめとしておく。
【００２１】
図１（Ｂ）に示すように、この扇形のシート１の両側辺４，５を一致させるように丸めて、一端側の側辺４の表面と他端側の側辺５の裏面とを合わせて全体を溶着してシールし、円錐の途中を切り取ったような形状の筒からなる側面部材６を形成する。
【００２２】
更に、側面部材６の底に同じく合成樹脂製の円板状の底面部７を溶着により接合するが、この際、円板状底面部７の周縁部の上面（裏面側）と前記側面部材６の下端部の表面側を下に折り返して合わせ、この部分を溶着してシールする。
【００２３】
こうすれば、テーパー缶の形状にフィットする形状の内袋が得られ、缶内部で内袋が余ることによるシワが生じない。
【００２４】
その後、内袋の上端部をテーパー缶の開口部外側に折り返して、テーパー缶を蓋等により封鎖すれば、各種液体や粉体の保管、輸送が可能になる。
【００２５】
図１（Ｃ）は扇形のシート１の一方の側辺４の表面と他方の側辺５の裏面を溶着したシール部８を示す断面図であり、図１（Ｄ）は側面部材６の下端部を内側に折り曲げた表面と底面部材７（の裏面）とを溶着したシール部９を示す断面図である。
【００２６】
これらのシール部８，９では、液体や粉体粒子が入り込むような隙間が生じていないので、内容物を取り出す際に全部の内容物を取り出すことができると共に、内袋内部に詰め込まれた液体等による内圧が高まっても、圧力がシール部８，９を引き剥がす方向に作用せず内袋のシール部８，９からの亀裂が生じて内容物が漏れ出すおそれがない。
【００２７】
【発明の効果】
以上のように、この発明の内袋によれば、テーパー缶の内側にフィットするので、テーパー缶の内側に収納した際にシワが生じることがなく、シワの発生による容量の低下やシワに入り込んだ内容物の取り出し困難に伴う作業性の低下がない。
【００２８】
また、溶着されたシール部の構造は袋小路のようにならないので、液体や粉体粒子が入り込まず、内容物が全て取り出すことができ、また、内容物の内圧によってもシール部に引き剥がし方向の力が加わらないのでシール部から剥れが生じて輸送や保管中に内容物がしみ出してしまうことがない。
【００２９】
更に、この内袋は平面シートを部分的に引き伸ばすことなしに製造でき、全体で均質な厚みが得られるので、厚みの薄い材料を用いることができ、使用しない時は折り畳んで収納することができる。
【図面の簡単な説明】
【図１】（Ａ）はこの発明の内袋の側面部材を構成するシートの平面図、（Ｂ）は側面部材と底面部材の分解斜視図、（Ｃ）及び（Ｄ）はシール部分の拡大断面図である。
【図２】従来の内袋の側面部材に使用する筒状体の斜視図である。
【図３】（Ａ），（Ｂ），（Ｃ）は従来の内袋の例を示す正面図である。
【図４】従来の内袋のシール部分の拡大断面図である。
【符号の説明】
１　　　扇形のシート
２　　　上辺
３　　　下辺
４，５　側辺
６　　　側面部材
７　　　底面部材
８，９　シール部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inner bag used for storing and transporting various liquids and powders in a state of being housed inside a can as an outer container, and more specifically, for a conical stacking in which an upper opening is larger than a lower bottom. The present invention relates to an inner bag for storing in a can.
[0002]
[Prior art]
When storing and transporting various liquids and powders, a cylinder made of a flexible and airtight material such as synthetic resin, using a bottomed outer container with a fixed shape and an open top A bottomed inner bag with the lower end of the body closed at the bottom is inserted into the outer container, and the upper end of the inner bag is folded back outside the opening of the outer container. If a liquid, powder or other fluid is stored and the top opening of the outer container is closed with a lid, etc., the inner wall of the outer container will not be soiled with the stored material, and any liquid or dirt that has previously adhered to the inner wall will not be contaminated. And storage and transportation of various liquids and powders without mixing.
[0003]
As a method of manufacturing the inner bag, usually, a synthetic resin is used to obtain a cylindrical body 10 as shown in FIG. 2 by an insulation method, and this cylindrical body 10 is used as a side member of the inner bag, and is similarly synthesized at one end. A circular bottom member (not shown) made of resin is joined by welding or the like to obtain a cylindrical inner bag having a circular bottom portion and a top opening having substantially the same shape as the can.
[0004]
In addition, as the outer container, a cylindrical can having a predetermined shape such as metal or plastic is mainly used, but in recent years, in consideration of the convenience of storage when not in use, the upper opening is more open than the lower bottom. Large conical cans, for example, bucket-shaped cans (hereinafter referred to as "tapered cans") have been used.
[0005]
These tapered cans can be stored without taking up a lot of space by taking out various liquids and powders from the inside and then stacking them on top so that other tapered cans of the same shape can be stored in the upper opening There is an advantage that can be.
[0006]
[Problems to be solved by the invention]
By the way, when using the regular cylindrical inner bag for the tapered can, if the dimensions of the bottom portion of the can and the bottom portion of the inner bag are matched, the inner bag cannot be folded around the top opening, If the size of the opening and the size of the inner bag are matched, the bottom portion of the inner bag will not enter the bottom of the can.
[0007]
Therefore, inner tapes such as those shown in FIGS. 3A to 3C are used for these tapered cans. In FIG. 3A, one end of the cylindrical body 10 is closed by a seal portion 11. (B) is the one with the sealed bottom of (A) tied, and (C) is a laminate of two flat sheets 12 having a tapered shape according to the shape of the can, and the periphery is sealed with a sealing portion 11. Sealed by
[0008]
When these are used for cans, those of (A) and (B) cause wrinkles in the inner bag at the bottom and the side near the bottom when stored in a tapered can, and those of (C) Also, although the upper part has a taper, the upper part is larger, but it does not completely match the inner wall of the tapered can, so that it is impossible to prevent the occurrence of wrinkles.
[0009]
When wrinkles are formed in the inner bag, the amount of storage is reduced by the amount of the wrinkles, and the wrinkles become a resistance when the inner bag is taken out, so that there is a problem that the inner bag cannot be taken out smoothly.
[0010]
The structure of the seal portion 11 used in the conventional bottomed inner bag or the inner bag shown in FIG. 3 is such that the ends of the sheets coincide with each other as shown in FIG. However, in this case, there is a problem that the remaining amount of the liquid or powder enters the gap formed in the form of a dead end, so that the contents cannot be used up.
[0011]
Furthermore, when the contents are liquid, the seal portion 11 may be peeled off from the inside by applying a force in the direction of peeling the seal portion 11 from the inside due to the pressure from the inside.
[0012]
On the other hand, there is also a method of integrally forming an inner bag having a tapered shape according to the shape of the can by vacuum molding or melting molding, and producing an inner bag without a seal portion and without wrinkles when stored. is there.
[0013]
However, in the former vacuum forming, a flat sheet is formed by molding with a vacuum, and a sheet material is partially stretched to produce a portion where the sheet thickness is reduced, so that a very thin sheet cannot be used. A relatively thick material is required for the inner bag of ~ 500 µm, which is expensive in terms of material cost, and because it is thick and does not fold when not in use, it takes up space when storing and transporting only the inner bag. There's a problem.
[0014]
Further, in the latter melt molding, a molten material is molded into a cylindrical shape having a taper by centrifugal force in a mold. However, the thickness tends to be non-uniform, and the thickness is increased as a whole. Because of the necessity, the same problem as the former was caused.
[0015]
The present invention has been made in order to solve the above-described problems. Wrinkles do not occur even when used in a tapered can, and contents may enter the seal portion or the seal portion may peel off. Further, it is another object of the present invention to provide an inner bag that can be folded at the time of storage and transportation because the material cost is low because the sheet thickness is not increased.
[0016]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention relates to an inner bag that is housed in a conical can having a top opening portion larger than a bottom portion and has a fan-shaped sheet in which upper and lower sides are arc-shaped and both sides are straight. A conical side member formed by welding a surface near one side and a back surface near the other side, and a circular bottom welded to a surface obtained by bending the lower end of the side member inward. It is an inner bag for a can consisting of a member.
[0017]
If the fan-shaped sheet is rolled into a tubular shape and both sides are welded to form a side member consisting of a cone (cut in the middle) -shaped tube, and the lower surface opening of the side member is closed with a circular bottom portion Thus, an inner bag that fits into a conical can having a top opening larger than the bottom can be obtained. Even if the inner bag is stored in the same can, wrinkles due to excessive dimensions of the inner bag do not occur.
[0018]
Further, since the one side surface and the other side surface of the fan-shaped sheet are welded to each other and the side surface member and the bottom member are welded, the welded seal portion does not become a dead end.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 (A) shows a fan-shaped sheet 1 constituting a side member forming an inner bag of the present invention, and is a single sheet having a thickness of about 100 to 150 μm made of a flexible, airtight synthetic resin or the like. Is a sheet obtained by cutting out the flat sheet of the above into a substantially fan shape in which the upper side 2 and the lower side 3 are arc-shaped, and both sides 4 and 5 are linear.
[0020]
The size of the arc of the upper side 2 is slightly larger than the circumference of the upper opening of the tapered can, and the size of the arc of the lower side 3 is slightly larger than the circumference of the bottom of the lower surface of the tapered can. Is slightly larger than the height of the tapered can.
[0021]
As shown in FIG. 1B, both sides 4 and 5 of the fan-shaped sheet 1 are rounded so as to coincide with each other, and the front surface of one side 4 and the back surface of the other side 5 are joined. Then, the whole is welded and sealed to form a side member 6 made of a tube having a shape like a cut-out portion of a cone.
[0022]
Further, a disk-shaped bottom portion 7 made of synthetic resin is also joined to the bottom of the side member 6 by welding. At this time, the upper surface (back side) of the peripheral portion of the disk-shaped bottom portion 7 and the side member 6 are joined. The surface of the lower end is folded down and fitted together, and this portion is welded and sealed.
[0023]
By doing so, an inner bag having a shape that fits the shape of the tapered can can be obtained, and wrinkles due to excess inner bag inside the can are not generated.
[0024]
After that, if the upper end of the inner bag is folded back to the outside of the opening of the tapered can and the tapered can is closed with a lid or the like, storage and transportation of various liquids and powders can be performed.
[0025]
FIG. 1C is a cross-sectional view showing a seal portion 8 in which the front surface of one side 4 and the back surface of the other side 5 of the fan-shaped sheet 1 are welded, and FIG. It is sectional drawing which shows the sealing part 9 which welded the surface which bent the part inward, and the bottom surface member 7 (back surface).
[0026]
Since there is no gap in the seal portions 8 and 9 into which the liquid or powder particles enter, the entire contents can be taken out when taking out the contents, and the liquid packed in the inner bag can be taken out. Even when the internal pressure is increased, the pressure does not act in the direction in which the seal portions 8 and 9 are peeled off, and there is no possibility that the contents may leak due to the occurrence of cracks from the seal portions 8 and 9 of the inner bag.
[0027]
【The invention's effect】
As described above, according to the inner bag of the present invention, since the inner bag fits inside the tapered can, no wrinkle occurs when the inner bag is stored inside the tapered can. There is no reduction in workability due to difficulty in removing the contents.
[0028]
In addition, since the structure of the welded seal portion does not look like a blind alley, liquid or powder particles do not enter, the entire content can be taken out, and even if the internal pressure of the content causes the peeling of the seal portion in the peeling direction. Since no force is applied, the content does not exude during transportation or storage due to peeling from the seal portion.
[0029]
Further, the inner bag can be manufactured without partially stretching the flat sheet, and a uniform thickness can be obtained as a whole, so that a thin material can be used and can be folded and stored when not in use. .
[Brief description of the drawings]
1A is a plan view of a sheet constituting a side member of an inner bag according to the present invention, FIG. 1B is an exploded perspective view of the side member and a bottom member, and FIGS. 1C and 1D are enlarged seal portions. It is sectional drawing.
FIG. 2 is a perspective view of a tubular body used for a side member of a conventional inner bag.
FIGS. 3A, 3B, and 3C are front views showing examples of a conventional inner bag.
FIG. 4 is an enlarged sectional view of a sealing portion of a conventional inner bag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fan-shaped sheet 2 Upper side 3 Lower side 4,5 Side 6 Side member 7 Bottom member 8,9 Seal part

Claims

上面開口部が底面部より大きな円錐状の缶に収納する内袋であって、上下辺が円弧状で両側辺が直線状の扇形のシートの一方の側辺付近の表面と他方の側辺付近の裏面とを溶着して形成した円錐状の側面部材と、該側面部材の下端部を内側に折り曲げた表面に溶着された円形状の底面部材とからなる缶用の内袋。An inner bag whose upper opening is housed in a conical can larger than the bottom, where the upper and lower sides are arc-shaped and both sides are straight, and the surface near one side and near the other side of the fan-shaped sheet An inner bag for a can, comprising a conical side member formed by welding the back surface of the can and a circular bottom member welded to the surface obtained by bending the lower end of the side member inward.