JPS593337B2 - square bottom freestanding bag - Google Patents

Description

【発明の詳細な説明】 本発明は、プラスチックフィルムチューブなどの軟質筒
体の下端縁に多角形状の底材を接合した、特に底部の破
袋強度や自立性にすぐれた角底自立袋に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a square-bottom self-supporting bag which has a polygonal bottom material bonded to the lower edge of a flexible cylindrical body such as a plastic film tube, and which has particularly excellent tear-breaking strength and self-reliance at the bottom.

プラスチックフィルムや紙などの筒体で構成された角底
自立袋としては、第１図に示すようなカセット袋が知ら
れている。A cassette bag as shown in FIG. 1 is known as a square-bottom free-standing bag made of a cylindrical body made of plastic film, paper, or the like.

これは筒体１の下端部を折り曲げて角形状に賦形すると
ともに底シール部２を接合することにより形成されるも
のでありー底部１”゛軟弱なため内容物を収納すると形
くずれを生じ易い。また、底部は部材が幾重にも重なり
合つているので、外観が悪く、かつ重なりあつた部材間
に内容物が入り込むなどの不都合がある。更に、袋が大
型の場合や内容物が重い場合には、底面の接合部３に応
力が集中し破袋してしまう欠５ 点がある。本発明は上
記問題を解決するためになされたものである。This is formed by bending the lower end of the cylindrical body 1 to shape it into a square shape and joining the bottom seal part 2. Since the bottom part 1'' is soft, it may lose its shape when the contents are stored. In addition, since the bottom part has many overlapping members, it looks bad and there are problems such as the contents getting stuck between the overlapping members.Furthermore, if the bag is large or the contents are heavy. In this case, there is a drawback that stress concentrates on the joint 3 on the bottom surface, causing the bag to break.The present invention has been made to solve the above problems.

本発明の角底自立袋は、筒体Ａ＾と、筒体の下端部に形
成される内向折曲げ縁Ａ＾゜に接着される多１０角形状
の底部Ｂとを構成部材とし、底材Ｂの角部に対応する角
部となる筒体の下端部を二つ折りにっまみ合せ、筒体の
角部の角度が対応する底材の角部とほぼ同じ角度になる
ようにつまみ合せ面Ａ＾’を熱接着しもしくは溶断接着
したのち、筒体１５を押広げることにより下端部に形成
される内向折曲げ縁Ａ＾ｓに底材Ｂを熱圧着せしめたも
のである。The square bottom self-standing bag of the present invention has a cylindrical body A^ and a polydecagonal bottom part B adhered to an inwardly bent edge A^° formed at the lower end of the cylindrical body as constituent members, and the bottom material Fold the bottom ends of the cylinders, which will be the corners corresponding to the corners of B, in half and place them together so that the angle of the corners of the cylinders is almost the same as the corresponding corner of the bottom material. After A^' is thermally bonded or fused and bonded, the bottom material B is thermocompression bonded to the inwardly bent edge A^s formed at the lower end by pushing out the cylindrical body 15.

本発明に使用される筒体Ａ＾は、プラスチックフィルム
、紙、アルミニウムホイル、あるいはこれらの複合フィ
ルムなどをチューブに成形したもの２０である。筒体の
少なくとも下端部（底材が接合される部分）は熱接着が
可能な構成とする。底材Ｂは、例えば厚紙、プラスチッ
ク板などであり、筒体の下端折り曲げ縁との熱接着が可
能な構成とする。筒体や底材自身熱接−性を有しない材
料の場２５合には、所要の部分に熱接着性樹脂などの塗
膜を施しておけばよい。第７図は三角底材Ｂと筒体Ａ＾
との組合せになる本発明自立袋の例を示す。The cylindrical body A^ used in the present invention is a tube 20 made of plastic film, paper, aluminum foil, or a composite film thereof. At least the lower end portion of the cylindrical body (the portion to which the bottom material is joined) is configured to be thermally bondable. The bottom material B is made of, for example, cardboard or a plastic plate, and is configured to be able to be thermally bonded to the bent edge of the lower end of the cylindrical body. In cases where the cylindrical body or bottom material itself is made of materials that do not have thermal bonding properties, it is sufficient to apply a coating film of thermal adhesive resin or the like to the required portions. Figure 7 shows triangular bottom material B and cylindrical body A^
An example of the self-standing bag of the present invention which is combined with the following is shown.

その製造法を第２図以下の図面により説明すると、まず
、Ξ角底材Ｂに３０相応する周長を有する筒体Ａ＾を準
備し、底材Ｂの角部に対応する角部となる部分にそつて
折り筋Ａ＾’を付ける（第２図）。折り筋Ａ＾４は必ず
しも筒体全長にわたる必要はなく、筒体の切口端面と内
向折曲げ縁線Ａ＾２との間だけでもよい。３５次に、筒
体に底材が接着される内向折曲げ縁Ａ＾ｓを形成するた
めに、筒体Ａ＾の折り筋先端部分を第８図のように二つ
折りにつまみ合せ、筒体の−１り【−角部の角度が底材
Ｂの角部とほぼ同じ角度になるようにつまみ合せ面Ａ６
（斜線部）を接着線Ａｌにそつて熱接着する。The manufacturing method will be explained with reference to the drawings in Figure 2 and below. First, a cylinder A^ having a circumference of 30 degrees corresponding to the Ξ square bottom material B is prepared, and the corner part corresponds to the corner part of the bottom material B. Make a crease A^' along the part (Figure 2). The fold line A^4 does not necessarily have to extend over the entire length of the cylinder, and may be formed only between the cut end surface of the cylinder and the inwardly bent edge line A^2. 35 Next, in order to form the inwardly bent edge A^s to which the bottom material is adhered to the cylinder, the tip of the crease of the cylinder A^ is folded in half as shown in Figure 8, and the cylinder is folded. -1 [-Pinch the mating surface A6 so that the angle of the corner is almost the same as the corner of the bottom material B.
(The shaded part) is thermally bonded along the adhesive line Al.

接着線Ａ１は、折り筋Ａ４と内向折曲げ縁線Ａ２との交
点を通り、内向折曲げ縁線Ａ２とのなす角度αが、底材
Ｂの対応する角部の角度のほぼ半分となるようにつまみ
合せ面Ａ６内に定められる。The adhesive line A1 passes through the intersection of the folding line A4 and the inward bending edge line A2, and the angle α formed with the inward bending edge line A2 is approximately half the angle of the corresponding corner of the bottom material B. is defined within the gripping surface A6.

このようにつまみ合せ面を接着すれば、その後筒体を押
広げたときに、筒体Ａは、第９図のように折り筋にそつ
た多角形状に賦形されるとともに、その端部が内向折曲
げ縁線Ａ２にそつて内側に絞り込まれ筒体周面とほぼ直
角に屈曲した内向折曲げ縁Ａ３が形成される。つまみ合
せ面Ａ６の接着法として、上記のように合せ面全体を接
着する代りに、接着線Ａ１にそつた溶断接着を行えば、
第３図のようにつまみ合せ面は余材部分として切取るこ
とができる。If the mating surfaces are glued in this way, when the cylinder is then pushed out, the cylinder A will be shaped into a polygonal shape along the creases as shown in Figure 9, and its ends will be An inward bending edge A3 is formed which is narrowed inward along the inward bending edge line A2 and bent at a substantially right angle to the circumferential surface of the cylinder. As a bonding method for the mating surface A6, instead of gluing the entire mating surface as described above, if fusing and gluing along the adhesive line A1 is performed,
As shown in Figure 3, the mating surface can be cut out as a surplus material.

筒体を広げれば第４図のように多角形状を呈し、端部に
は内向折曲げ縁Ａ３が形成される。上記の筒体Ａと底部
Ｂとを接合するには、底材Ｂを、それと同じ形状の天面
を有する下型Ｃの天面に載置し、第５図のように筒体Ａ
を広げながら被嵌し、内向折曲げ縁Ａ３を底材Ｂの周縁
に重ね合せる。When the cylindrical body is expanded, it assumes a polygonal shape as shown in FIG. 4, and an inwardly bent edge A3 is formed at the end. To join the cylinder A and the bottom B, place the bottom material B on the top surface of the lower mold C, which has a top surface of the same shape, and as shown in FIG.
The inwardly bent edge A3 is overlapped with the periphery of the bottom material B.

この場合、筒体Ａを先に下型Ｃに被嵌し、内向折曲げ縁
Ａ３の土面に底材Ｂを重ね合せるようにしてもよい。つ
いで、底材と筒体の内向折曲げ縁とを熱圧着させるに足
る温度に加熱された押型Ｄを上方から押付けて両者を熱
圧着させれば、目的とする角底自立袋として完成される
。In this case, the cylindrical body A may be fitted into the lower die C first, and the bottom material B may be superimposed on the soil surface of the inwardly bent edge A3. Next, a press mold D heated to a temperature sufficient to thermocompress the bottom material and the inwardly bent edge of the cylindrical body is pressed from above to thermocompress them, thereby completing the desired square bottom self-supporting bag. .

熱圧着には、高周波接着や超音波接着等の方法を利用し
てもよい。なお、内向折曲げ縁Ａ３の各角部に前記第９
図のようにつまみ合せ面Ａ６が余材として残存している
場合でも、押型Ｄにより押圧すれば、内向折曲げ縁Ａ３
の面内に圧着し平坦化するので自立性に問題はない。下
型から抜取つたあと、折りたためば、コンパクトに保管
することができる。底材Ｂの形状は三角形に限らず、四
角形、五角形など任意である。For thermocompression bonding, methods such as high frequency bonding and ultrasonic bonding may be used. In addition, at each corner of the inwardly bent edge A3, the ninth
Even if the mating surface A6 remains as surplus material as shown in the figure, if pressed with the press die D, the inward bent edge A3
Since it is crimped and flattened within the plane, there is no problem with its independence. After removing it from the lower mold, it can be folded and stored compactly. The shape of the bottom material B is not limited to a triangle, but may be any shape such as a quadrangle or a pentagon.

また、底材Ｂは平面のものに限らず、例えば皿などの容
器形状を有するものや箱形状に折曲げたものなど、内容
物の形状や収納態様に応じた種々の形状を有するものを
使用することができる。本発明の角底自立袋は、筒体の
下端部に形成される内向折曲げ縁に底材を接着一体化し
たものであるから、゜底部の破袋強度にすぐれ、かつ形
くずれしにくい。In addition, the bottom material B is not limited to a flat one, but can have various shapes depending on the shape of the contents and storage mode, such as one shaped like a container such as a plate, or bent into the shape of a box. can do. Since the square bottom self-standing bag of the present invention has a bottom material bonded and integrated with the inwardly bent edge formed at the lower end of the cylindrical body, the bottom part has excellent tear strength and is resistant to deformation.

内容物の収納も容易であり、例えば第７図のように袋口
部をシールＡ５すれば、良好な外観・体裁を有し、自立
性の安定した包装体となる。なお、筒体の土部に吊り下
げ用の孔を設けてヒモなどで吊下げることもできる。It is easy to store the contents, and if the opening of the bag is sealed A5 as shown in FIG. 7, for example, the package has good appearance and appearance and is stable and self-supporting. In addition, it is also possible to provide a hole for hanging in the soil part of the cylinder and hang it with a string or the like.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のカセット袋の斜視図、第２図〜第４図は
本発明自立袋の製造工程の例を示す斜視図、第５図は断
面図、第６図は本発明自立袋の斜視図、第７図は本発明
自立袋の使用時の斜視図、第８図、第９図は筒体の内向
折曲げ縁の形成要領の例を示す斜視図である。 Ａ：筒体、Ａ１：接着線、Ａ２：内向折曲げ縁線、Ａ３
：内向折曲げ縁、Ａ４：折り筋、Ａ６：つまみ合せ面、
Ｂ：底材。Fig. 1 is a perspective view of a conventional cassette bag, Figs. 2 to 4 are perspective views showing an example of the manufacturing process of the self-standing bag of the present invention, Fig. 5 is a sectional view, and Fig. 6 is a perspective view of the self-standing bag of the present invention. FIG. 7 is a perspective view of the self-supporting bag of the present invention in use, and FIGS. 8 and 9 are perspective views showing an example of how to form the inwardly bent edges of the cylindrical body. A: Cylindrical body, A1: Adhesive line, A2: Inward bent edge line, A3
: Inward folded edge, A4: Crease, A6: Pinch surface,
B: Sole material.

Claims (1)

【特許請求の範囲】[Claims] １ 多角形状底材Ｂを接着するための内向折曲げ縁Ａ＾
３を形成すべき筒体Ａの下端部の、底材角部に対応する
部分をつまみ合せるとともに、その折り筋Ａ＾４と内向
折曲げ縁線Ａ＾２との交点を通る接着線Ａ＾１を、内向
折曲げ縁線Ａ＾２とのなす角度ａが底材角部の角度のほ
ぼ半分となるようにつまみ合せ面Ａ＾６内に定め、その
接着線Ａ＾１にそつてつまみ合せ面を熱接着しもしくは
溶断接着したのち、筒体Ａの開口を広げることにより筒
体下端部に形成される内向折曲げ縁Ａ＾３に底材Ｂを熱
圧着してなる角底自立袋。1 Inward bent edge A^ for gluing polygonal bottom material B
At the same time, pinch together the lower end portions of the cylinder A that are to form the cylindrical body A, and draw the adhesive line A^ that passes through the intersection of the folding line A^4 and the inward bending edge line A^2. 1 within the gripping surface A^6 so that the angle a formed with the inward bending edge line A^2 is approximately half the angle of the corner of the bottom material, and pinch it along the adhesive line A^1. A square-bottom self-supporting bag made by thermally bonding the bottom material B to the inwardly bent edge A^3 formed at the lower end of the cylinder body by widening the opening of the cylinder body A after thermally bonding or fusing the mating surfaces. .