JP4807658B2 - Square bottom paper bag manufacturing method and square bottom paper bag - Google Patents

Square bottom paper bag manufacturing method and square bottom paper bag Download PDF

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JP4807658B2
JP4807658B2 JP2005339484A JP2005339484A JP4807658B2 JP 4807658 B2 JP4807658 B2 JP 4807658B2 JP 2005339484 A JP2005339484 A JP 2005339484A JP 2005339484 A JP2005339484 A JP 2005339484A JP 4807658 B2 JP4807658 B2 JP 4807658B2
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摩里子 藤代
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本発明は、角底紙袋の底部内面に底部補強材を設ける角底紙袋の製造方法とその角底紙袋に関する。 The present invention relates to a method for manufacturing a square bottom paper bag in which a bottom reinforcing material is provided on the bottom inner surface of the square bottom paper bag, and the square bottom paper bag.

従来、図８に示すように、底部１Ａを角底とした紙袋１が知られており、この種の角底紙袋１は、製袋機により機械的に折曲げ加工され、自動的に成形される。そして、製袋機により成形される角底紙袋１は、底部１Ａを内側に折り畳んで貼り合わせることから、紙袋１内の収容物によって紙袋１の底部１Ａが破損などしないように紙袋１の底部１Ａを補強する必要がある。このため、従来、例えばボール紙などの比較的厚い底部補強材２を紙袋１の底部１Ａの内面に敷いて紙袋１の底部１Ａを二重構造としていた（例えば特許文献１）。 Conventionally, as shown in FIG. 8, a paper bag 1 having a bottom 1A as a square bottom is known. This type of square bottom paper bag 1 is mechanically bent by a bag making machine and automatically formed. The And since the square bottom paper bag 1 shape | molded with a bag making machine folds and adheres the bottom part 1A inside, the bottom part 1A of the paper bag 1 is prevented so that the bottom part 1A of the paper bag 1 is not damaged by the contents in the paper bag 1. Need to be reinforced. For this reason, conventionally, for example, a relatively thick bottom reinforcing material 2 such as cardboard is laid on the inner surface of the bottom 1A of the paper bag 1, and the bottom 1A of the paper bag 1 has a double structure (for example, Patent Document 1).

このような角底紙袋を製袋機により成形する場合、まず両側を略Ｍ字状に折り込んだ扁平な紙筒を作り、この紙筒の袋口を折り込んで底部となる底折りを行う。そして、その扁平な紙筒５を作る方法として、図９（Ａ）に示すように、製袋原紙10の一端縁部とほぼ中央部分に３本の平行な折筋６ａ，６ｂ，６ａと７ａ，７ｂ，７ａを形成し、図９（Ｂ）に示すように、その折筋６ａ，６ｂ，６ａと７ａ，７ｂ，７ａをＭ字状に折り込み、製袋原紙10の外端縁部に糊付けした後、製袋原紙10を中央部から二つ折りに折畳んで外端縁の糊付部を貼り合わせることによって、図９（Ｂ）に示すように、両側部にＭ字状の折込部６，７を有する偏平な紙筒５を形成する。そして、このように二つ折りされた紙筒５を角底製袋機に供給して紙筒５の底を折込んで角底紙袋１を成形している。
特開平１１−９１０１２号公報 When such a square bottom paper bag is formed by a bag making machine, first, a flat paper tube is formed by folding both sides into a substantially M shape, and the bottom of the paper tube is folded by folding the bag mouth of the paper tube. Then, as a method of making the flat paper cylinder 5, as shown in FIG. 9A, three parallel folding lines 6a, 6b, 6a and 7a are formed at one end edge and substantially the center of the bag making base paper 10. , 7b, 7a, and as shown in FIG. 9B, the folding lines 6a, 6b, 6a and 7a, 7b, 7a are folded in an M shape and glued to the outer edge of the bag-making base paper 10. After that, the bag-making base paper 10 is folded in half from the central portion and the glued portions on the outer edge are bonded together, so that the M-shaped folded portions 6 are formed on both sides as shown in FIG. , 7 is formed. Then, the folded paper tube 5 is supplied to the square bottom bag making machine, and the bottom of the paper tube 5 is folded to form the square bottom paper bag 1.
JP 11-91012 A

上記のように、紙袋１は、製袋機により自動的に成形できるものの、紙袋１の底部１Ａ内面に組み込む底部補強材２は、紙袋１と別途、紙袋１の底部１Ａの大きさに合わせて切断し、これを完成した紙袋１の内部に１枚毎手作業で挿入しており、底部補強材２の組み込みを効率よくできる方法及び装置の開発が望まれていた。 As described above, although the paper bag 1 can be automatically formed by the bag making machine, the bottom reinforcing material 2 incorporated into the inner surface of the bottom 1A of the paper bag 1 is adjusted to the size of the bottom 1A of the paper bag 1 separately from the paper bag 1. There has been a demand for the development of a method and apparatus that can be cut and inserted into the completed paper bag 1 manually by hand to efficiently incorporate the bottom reinforcing member 2.

そこで、本発明は、このような問題を解決し、紙筒の底部内面に底部補強材を簡便に設けることができる角底紙袋の製造方法とその角底紙袋を提供することを目的とする。 Accordingly, an object of the present invention is to solve such a problem and to provide a method for manufacturing a square bottom paper bag and a square bottom paper bag in which a bottom reinforcing material can be simply provided on the bottom inner surface of a paper tube.

上記課題を解決するため、本発明の請求項１記載の角底紙筒の製造方法は、角角底紙袋用製袋原紙の紙筒側部箇所を折り込んで前後を開口する紙筒を成形する製筒工程と、前記紙筒の一方の開口の底縁の底折を行う底折工程とを備え、前記紙筒の底部内面に底部補強材を設ける角底紙袋の製造方法において、前記底折工程前に紙筒の底縁の一側部の内面に前記底部補強材を配置し、この底部補強材を配置した状態で前記一側部を前記底部内面に折り畳んで該底部補強材を前記底部内面に配置した後、前記底縁の他側部を折り畳む製造方法である。 In order to solve the above-mentioned problem, the manufacturing method of a square bottom paper tube according to claim 1 of the present invention forms a paper tube that is opened at the front and back by folding the paper tube side portion of the bag making base paper for the square bottom paper bag. In the method of manufacturing a square bottom paper bag, comprising a cylinder making process and a bottom folding process of performing a bottom folding of a bottom edge of one opening of the paper cylinder, wherein a bottom reinforcing material is provided on a bottom inner surface of the paper cylinder. the bottom reinforcement disposed on the inner surface of one side of the bottom edge of the paper tube in the preceding step, Nde tatami folding said one side while placing the bottom stiffener to the inner bottom surface said bottom portion reinforcement It is the manufacturing method which folds the other side part of the said bottom edge after arrange | positioning to a bottom part inner surface .

本発明の請求項２記載の角底紙袋の製造方法は、前記一側部を、左右の前記側部間の左右方向折線と、この左右方向折線の端部と前記側部の底縁との間の斜め折線とから折り畳み、前記一側部の左右方向折線と連続する前記側部の前後方向折線から、前記底縁の前記側部を折り畳んだ後、左右の前記側部間の左右方向折線から前記他側部を折り畳む製造方法である。 In the manufacturing method of the square bottom paper bag according to claim 2 of the present invention, the one side portion includes a left-right fold line between the left and right side portions, an end portion of the left-right fold line, and a bottom edge of the side portion. Folded from the diagonal fold line between, and folded the side part of the bottom edge from the front-rear fold line continuous with the left-right fold line of the one side, and then left-right fold line between the left and right side parts To the other side part.

本発明の請求項３記載の角底紙袋の製造方法は、角底紙袋用製袋原紙の紙筒側部箇所をＭ字状に折り込む製造方法である。 The manufacturing method of the square bottom paper bag of Claim 3 of this invention is a manufacturing method which folds the paper tube side part of the bag-making base paper for square bottom paper bags in M shape.

本発明の請求項４記載の角底紙袋の製造方法は、前記一側部に底部補強材を取り付けた後、この底部補強材を取り付けた状態で前記一側部を折り畳む製造方法である。 The manufacturing method of the square bottom paper bag of Claim 4 of this invention is a manufacturing method which, after attaching a bottom part reinforcing material to the said one side part, folds the said one side part in the state which attached this bottom part reinforcing material.

本発明の請求項５記載の角底紙袋は、請求項１記載の角底紙袋の製造方法により製造され、紙筒の一方の開口の底縁を底折して底部を形成し、その底部の内面に底部補強材を設けた角底紙袋において、前記紙筒の左右の側部間の左右方向折線とこの左右方向折線の端部と前記側部の底縁との間の斜め折線から折り畳まれ、内面に底部補強材を設けた前記底縁の一側部と、前記左右方向折線と連続する前記側部の前後方向折線から前記一側部の外面に重ね合わせて折り畳んだ前記底縁の前記側部と、
前記一側部の他側の左右方向折線から、前記底縁の前記側部の外面に重ね合わせて折り畳んだ前記底縁の他側部と、を備えるものである。 A square bottom paper bag according to claim 5 of the present invention is manufactured by the method of manufacturing a square bottom paper bag according to claim 1, and forms a bottom portion by folding the bottom edge of one opening of the paper tube. In a square bottom paper bag provided with a bottom reinforcing material on the inner surface, it is folded from a left-right fold line between the left and right side portions of the paper tube and an oblique fold line between the end of the left-right fold line and the bottom edge of the side portion. The one side of the bottom edge provided with a bottom reinforcing material on the inner surface, and the bottom edge of the side edge folded from the front and rear fold line of the side part continuous with the left and right fold line on the outer surface of the one side part. Side,
And the other side portion of the bottom edge folded and overlapped with the outer surface of the side portion of the bottom edge from the left-right fold line on the other side of the one side portion.

請求項１の構成によれば、底折工程前に、紙筒の底縁の一側部の内面に底部補強材を設け、この底部補強材を配置した状態で一側部を折り畳んだ後、これに重ねるようにして底縁の他側部を折り畳むことにより、底折と同時に底部内面に底部補強材を設けることができる。これにより、底部補強材の組み込みを効率よく行うことができ、自動化にも適したものとなる。 According to the configuration of claim 1, before the bottom folding step, after providing the bottom reinforcing material on the inner surface of one side portion of the bottom edge of the paper tube, after folding the one side portion in a state in which the bottom reinforcing material is disposed , By folding the other side of the bottom edge so as to overlap with this, a bottom reinforcing material can be provided on the inner surface of the bottom simultaneously with the bottom folding. As a result, the bottom reinforcing member can be efficiently incorporated and is suitable for automation.

請求項２の構成によれば、底部補強材と共に一側部を、左右の前記側部間の左右方向折線と、この左右方向折線の端部と前記側部の底縁との間の斜め折線とから折り畳むことにより、底部補強材が紙筒の底部に配置され、この後、前記左右方向折線と連続する前後方向折線から、前記側部の底縁を折り畳んだ後、左右方向折線から前記他側部を折り畳むことにより、底部補強材を備えた底部を形成することができる。 According to the configuration of claim 2, one side portion together with the bottom reinforcing member, a left-right fold line between the left and right side portions, and an oblique fold line between the end portion of the left-right fold line and the bottom edge of the side portion. The bottom reinforcing material is disposed at the bottom of the paper tube, and then the bottom edge of the side portion is folded from the front-rear fold line continuous with the left-right fold line, and then the other from the left-right fold line. By folding the sides, a bottom with a bottom reinforcement can be formed.

請求項３の構成によれば、側部をＭ字状に折り込んだ紙筒の底部内面に、底部補強材を設けることができる。 According to the structure of Claim 3, a bottom part reinforcing material can be provided in the bottom inner surface of the paper cylinder which folded the side part into M shape.

請求項４の構成によれば、前記一側部の内面に底部補強材を取り付けた後、この底部補強材を取り付けた状態で一側部を折り畳むことにより、折り畳み時に一側部に対して底部補強材が位置ずれすることがなく、補強材を所定位置に配置することができる。 According to the configuration of claim 4, after attaching the bottom reinforcing member to the inner surface of the one side portion, the bottom portion is folded with respect to the one side portion when folded by folding the one side portion with the bottom reinforcing member attached. The reinforcing material can be disposed at a predetermined position without being displaced.

請求項５の構成によれば、底部補強材を簡便に設けることができる角形紙袋を提供することができる。 According to the structure of Claim 5, the square paper bag which can provide a bottom part reinforcing material simply can be provided.

以下、本発明の実施例について図１〜図７を参照して説明する。なお、図８〜図９の従来例で示した紙筒５と同一機能を有する部分には同一符号を付し、異なる部分についてのみ説明する。 Embodiments of the present invention will be described below with reference to FIGS. Note that portions having the same functions as those of the paper tube 5 shown in the conventional examples of FIGS. 8 to 9 are denoted by the same reference numerals, and only different portions will be described.

紙袋１は図示しない製袋機により、所定サイズに裁断した一枚の製袋原紙10を機械的に折り曲げて成形される。また、紙袋１の底部１Ａを補強する底部補強材２は、底折工程前の例えば紙袋１の製筒工程前の平面的に展開された製袋原紙10に糊付けされる。 The paper bag 1 is formed by mechanically folding a single bag-making base paper 10 cut into a predetermined size by a bag making machine (not shown). Further, the bottom reinforcing material 2 for reinforcing the bottom 1A of the paper bag 1 is glued to the bag-making base paper 10 developed in a plane before the bottom folding process, for example, before the cylinder making process of the paper bag 1.

製筒工程では、図１（Ａ）のように、予め折癖をつけるために一縁部とほぼ中間部に、３本の平行な折筋６ａ，６ｂ，６ａと折筋７ａ，７ｂ，７ａを製袋原紙10に刻設し、図１（Ｂ）のように、この折筋６ａ，７ａを刻設した製袋原紙10の一側縁部とほぼ中央部とをＭ字状に折り込んで外縁同士を貼り合わせることによって、図１（Ｃ）のように、前後を開口する紙筒５を成形し、この紙筒５の左右の側部５Ｓ，５Ｓには、Ｍ字状の折込部６，７が形成される。尚、前記製袋原紙10の一縁部とほぼ中間部が、紙筒５の左右の側部５Ｓ，５Ｓとなる紙筒側部箇所である。そして、好ましくは、この紙筒５を成形する前に、予め紙袋１の底部１Ａに応じたサイズに切断した底部補強材２を、製袋原紙10に貼り付ける。尚、図１（Ｃ）のように紙筒５を形成してから、底部補強材２を貼り付けてもよい。 In the cylinder making process, as shown in FIG. 1 (A), three parallel folding lines 6a, 6b, 6a and folding lines 7a, 7b, 7a are formed at one edge and almost the middle part for pre-fitting. Is engraved on the bag-making base paper 10, and one side edge portion and substantially the center portion of the bag-making base paper 10 on which the folding lines 6a and 7a are engraved are folded in an M shape as shown in FIG. By bonding the outer edges together, as shown in FIG. 1C, a paper tube 5 that opens front and rear is formed, and the left and right side portions 5S and 5S of the paper tube 5 are provided with M-shaped folded portions 6. , 7 are formed. In addition, the one edge part and the substantially intermediate part of the said bag making base paper 10 are the paper cylinder side part location used as the right and left side parts 5S and 5S of the paper cylinder 5. FIG. Preferably, before the paper tube 5 is molded, the bottom reinforcing material 2 that has been cut in advance according to the size of the bottom 1A of the paper bag 1 is attached to the bag-making base paper 10. In addition, after forming the paper tube 5 as shown in FIG. 1C, the bottom reinforcing member 2 may be attached.

前記底部補強材２は、前記折筋６ａ，７ａ間の底縁１Ｆの一側部11の内面に配置させて給紙し、接着剤にて該底縁１Ｆの一側部11に糊付けする。このように糊付けなどの接着により、底縁１Ｆの一側部11の内面に底部補強材２を取り付ける。また、底部補強材２は、底折後、紙袋１の底部１Ａに内面に沿うように、製袋原紙10の底縁１Ｆから所定寸法だけ突出して接着する。そして、図１（Ｂ）で示すように、各折筋６ａ，７ａをＭ字状に折り込みながら中間部の折筋７ａ部分から製袋原紙10を二つ折りする。この二つ折り前の製袋原紙10が展開した状態で、前記底部補強材２が前記一側部11の内面に取り付けられる。そして、折筋６ａの外縁に形成された糊代13に製袋原紙10の他方の外縁を糊付けし、図１（ｃ）で示すように、前後を開口した紙筒５を形成する。したがって、底部補強材２が紙筒５の一側部11に貼り付けられた状態で、次工程の底折工程が行われ、このように底折工程の前に一側部11に底部補強材２が取り付けられる。 The bottom reinforcing material 2 is placed on the inner surface of one side 11 of the bottom edge 1F between the folding lines 6a and 7a, and is fed and glued to the one side 11 of the bottom edge 1F with an adhesive. In this manner, the bottom reinforcing member 2 is attached to the inner surface of the one side portion 11 of the bottom edge 1F by bonding such as gluing. Further, after the bottom folding, the bottom reinforcing member 2 protrudes from the bottom edge 1F of the bag making base paper 10 by a predetermined dimension and adheres along the bottom 1A of the paper bag 1 along the inner surface. Then, as shown in FIG. 1B, the bag-making base paper 10 is folded in half from the middle folding line 7a while folding each folding line 6a, 7a into an M shape. The bottom reinforcing member 2 is attached to the inner surface of the one side portion 11 in a state where the bag-making base paper 10 before folding is unfolded. Then, the other outer edge of the bag-making base paper 10 is glued to the glue margin 13 formed on the outer edge of the folding line 6a to form a paper cylinder 5 having an opening at the front and rear as shown in FIG. Accordingly, the bottom folding process of the next process is performed in a state where the bottom reinforcing material 2 is attached to the one side part 11 of the paper tube 5, and thus the bottom reinforcing material is attached to the one side part 11 before the bottom folding process. 2 is attached.

紙筒５の底折工程について、図２〜図７を参照して説明する。製筒工程で二折りされた紙筒５は、図２に示すように、底折りのための２本の平行した折筋21，22が紙筒５の底縁１Ｆ寄り刻設され、これら折筋21，22は底縁１Ｆと略平行をなす。尚、図２では、理解を容易にするため、側部５Ｓを伸ばして開口を開いた状態を図示している。また、紙筒５の側部５Ｓ，５Ｓには、前記折筋21と折筋６ｂ，７ｂとの交差箇所と、前記折筋22と折筋６ａ，６ａ，７ａ，７ａとの交差箇所との間にそれぞれ上斜め折筋23，23，23，23を形成しておく。この上斜め折筋23は、紙筒５の内面側に凸に形成され、折筋６ｂ，７ｂに対して略45度の角度で形成されている。そして、図１（Ｃ）の状態から、図３に示すように、上部側の折筋21から底縁１Ｆ側を、例えば９０度程度折り曲げ、図４に示すように、底縁１Ｆを広げながら、折筋21，22と上斜め折筋23，23，23，23を折り込み、左右方向折線21Ｓ，21Ｓ，前後方向折線21Ｚ，21Ｚ，左右方向折線22Ｓ，22Ｓ，前後方向折線22Ｚ，22Ｚ及び上斜め折線23Ｕを形成して紙筒５の底縁１Ｆを角形に開口させる。尚、図４の状態で、左右方向折線22Ｓ，22Ｓ及び前後方向折線22Ｚ，22Ｚ箇所において、原紙10は略９０度に折られている。 The bottom folding process of the paper tube 5 will be described with reference to FIGS. As shown in FIG. 2, the paper tube 5 folded in the cylinder making process has two parallel folding lines 21 and 22 for bottom folding near the bottom edge 1F of the paper tube 5. The streaks 21 and 22 are substantially parallel to the bottom edge 1F. In FIG. 2, for easy understanding, a state in which the side portion 5S is extended and an opening is opened is illustrated. Further, on the side portions 5S and 5S of the paper tube 5, there are intersections between the folding line 21 and the folding lines 6b and 7b and intersections between the folding line 22 and the folding lines 6a, 6a, 7a and 7a. Upper diagonal folding lines 23, 23, 23, and 23 are formed between them. The upper oblique crease 23 is formed to be convex on the inner surface side of the paper tube 5, and is formed at an angle of approximately 45 degrees with respect to the creases 6b and 7b. Then, from the state of FIG. 1C, as shown in FIG. 3, the bottom edge 1F side of the upper folding line 21 is bent, for example, about 90 degrees, and the bottom edge 1F is expanded as shown in FIG. The folding lines 21, 22 and the upper diagonal folding lines 23, 23, 23, 23 are folded, the horizontal folding lines 21S, 21S, the longitudinal folding lines 21Z, 21Z, the lateral folding lines 22S, 22S, the longitudinal folding lines 22Z, 22Z and the upper side. A diagonal fold line 23U is formed to open the bottom edge 1F of the paper tube 5 into a square shape. In the state of FIG. 4, the base paper 10 is folded at approximately 90 degrees at the left and right fold lines 22S and 22S and the front and rear fold lines 22Z and 22Z.

そして、前記一側部11は、左右方向折線22Ｓと底縁１Ｆと折筋６ａ，７ｂに囲まれた部分であり、前記他側部14は、一側部11と対向する位置で、左右方向折線22Ｓと底縁１Ｆと折筋６ａ，７ｂに囲まれた部分であり、一方の底縁１Ｆの側部５Ｓとは、左右方向折線22Ｓと底縁１Ｆと折筋６ａ，６ａに囲まれた部分であり、他方の底縁１Ｆの側部５Ｓとは、左右方向折線22Ｓと底縁１Ｆと折筋７ａ，７ａに囲まれた部分である。 The one side portion 11 is a portion surrounded by the left-right fold line 22S, the bottom edge 1F, and the folding lines 6a and 7b, and the other side portion 14 is located at a position facing the one side portion 11 in the left-right direction. It is a part surrounded by the folding line 22S, the bottom edge 1F, and the folding lines 6a, 7b, and the side part 5S of one bottom edge 1F is surrounded by the horizontal folding line 22S, the bottom edge 1F, and the folding lines 6a, 6a. The side 5S of the other bottom edge 1F is a part surrounded by the left-right fold line 22S, the bottom edge 1F, and the folding lines 7a and 7a.

また、紙筒５の底縁１Ｆの左右の側部５Ｓ，５Ｓには、一側面11の左右方向折線21Ｓの両端と折筋６ａ，７ａとの交差箇所と、側部５Ｓの底縁１Ｆとの間に、下斜め折筋24，24が設けられ、この下斜め折筋24は、紙筒５の外面側に凸に形成されると共に、底縁１Ｆに対して略45度の角度で形成されている。また、一側面11の反対側には前記他側面14が位置し、この他側面14の左右方向折線22Ｓの両端と折筋６ａ，７ａとの交差箇所と、他側面14の底縁１Ｆとの間に、他側斜め折筋25，25が設けられ、この他側斜め折筋25は、紙筒５の外面側に凸に形成されると共に、底縁１Ｆに対して略45度の角度で形成されている。 Further, on the left and right side portions 5S and 5S of the bottom edge 1F of the paper tube 5, there are intersections between both ends of the left and right fold line 21S of one side surface 11 and the folding lines 6a and 7a, and the bottom edge 1F of the side portion 5S. The lower diagonal folding lines 24, 24 are provided in between, and the lower diagonal folding lines 24 are formed convexly on the outer surface side of the paper tube 5 and at an angle of about 45 degrees with respect to the bottom edge 1F. Has been. Further, the other side surface 14 is located on the opposite side of the one side surface 11, and the intersection of the left and right folding lines 22S of the other side surface 14 with the folding lines 6a and 7a and the bottom edge 1F of the other side surface 14 The other side oblique folding lines 25, 25 are provided therebetween, and the other side oblique folding lines 25 are formed to be convex on the outer surface side of the paper tube 5 and at an angle of about 45 degrees with respect to the bottom edge 1F. Is formed.

次に、図５に示すように、底部補強材２と共に一側部11を、前記左右方向折線22Ｓから内側に折り畳むと共に、その一側部11の左右方向折線22Ｓの端部と底縁１Ｆとの間の下斜め折筋24から折り畳み、これにより、下斜め折筋24が下斜め折線24Ｓになる。尚、一側部11の両側の折筋６ａ，７ａ箇所は前後方向折線22Ｚ，22Ｚの内面側に沿うように折り込む。このようにして折り込むことにより、一側部11全体を紙袋１の底部１Ａの内面に折り込むことができる。この後、図６に示すように、側部５Ｓ，５Ｓの底縁１Ｆ，１Ｆを前後方向折線22Ｚから前記一側部11に重ね合わせるように折り重ねると共に、他側斜め折筋25，25を折り込んで他側斜め折線25Ｔ，25Ｔを形成する。この後、図７に示すように、前記他側内面14を左右方向折線21Ｓから折り畳んで一側部11に重ね合わせる。この他側内面14を折り畳む前に、該他側内面14に糊付けし、該他側内面14を底縁１Ｆの一側面11又は底縁１Ｆの側部５Ｓ，５Ｓの外面に張り付け、紙袋１の底部１Ａを形成する。尚、底縁１Ｆの側部５Ｓを一側部11に接着するようにしてもよい。 Next, as shown in FIG. 5, the one side portion 11 together with the bottom reinforcing member 2 is folded inward from the left and right fold line 22S, and the end portion of the one side portion 11 and the bottom edge 1F Folded from the lower diagonal folding line 24 between the lower diagonal folding line 24, thereby the lower diagonal folding line 24 becomes a lower diagonal folding line 24S. It should be noted that the folding lines 6a and 7a on both sides of the one side portion 11 are folded along the inner surface side of the front and rear fold lines 22Z and 22Z. By folding in this way, the entire side portion 11 can be folded into the inner surface of the bottom portion 1 </ b> A of the paper bag 1. Thereafter, as shown in FIG. 6, the bottom edges 1F, 1F of the side portions 5S, 5S are folded so as to overlap the one side portion 11 from the front-rear direction folding line 22Z, and the other side oblique folding lines 25, 25 are formed. The other side oblique folding lines 25T and 25T are formed by folding. Thereafter, as shown in FIG. 7, the other inner surface 14 is folded from the left-right fold line 21 </ b> S and overlapped with the one side portion 11. Before folding the other side inner surface 14, the other side inner surface 14 is glued, and the other side inner surface 14 is attached to one side 11 of the bottom edge 1F or the outer surface of the side portions 5S and 5S of the bottom edge 1F. The bottom 1A is formed. Note that the side portion 5S of the bottom edge 1F may be bonded to the one side portion 11.

尚、前記２本の折筋21，22の間隔Ｋは、図２に示すように、紙袋１の最大開口巾Ｗ、すなわち、紙袋１の底部１Ａの巾の半分の巾となる。また、折筋22から底縁１Ｆまでの一側部11及び他側部14の巾Ｋ１は底折りの際、これら一側部11及び他側部14が相互にラップするよう紙袋１の最大開口巾Ｗより広く設定されている。 As shown in FIG. 2, the distance K between the two folding lines 21 and 22 is the maximum opening width W of the paper bag 1, that is, half the width of the bottom portion 1A of the paper bag 1. Further, the width K1 of the one side portion 11 and the other side portion 14 from the folding line 22 to the bottom edge 1F is the maximum opening of the paper bag 1 so that the one side portion 11 and the other side portion 14 wrap each other when the bottom is folded. It is set wider than the width W.

このように本実施例では、請求項１に対応して、角底紙袋用製袋原紙10の紙筒側部箇所を折り込んで前後を開口する紙筒５を成形する製筒工程と、紙筒５の一方の開口の底縁１Ｆの底折を行う底折工程とを備え、紙筒５の底部内面に底部補強材２を設ける角底紙袋の製造方法において、前記底折工程前に紙筒５の底縁１Ｆの一側部の内面に底部補強材２を配置し、この底部補強材２を配置した状態で一側部11を底部内面に折り畳んだ後、底縁１Ｆの他側部14を折り畳むから、底折工程前に、紙筒５の底縁１Ｆの一側部11の内面に底部補強材２を設け、この底部補強材２を配置した状態で一側部11を折り畳んだ後、これに重ねるようにして底縁１Ｆの他側部14を折り畳むことにより、底折と同時に底部１Ａ内面に底部補強材２を設けることができる。これにより、底部補強材２の組み込みを効率よく行うことができ、自動化にも適したものとなる。 Thus, in this embodiment, in correspondence with claim 1, a cylinder making process for forming the paper cylinder 5 which is opened at the front and rear by folding the paper cylinder side portion of the square bottom paper bag making base paper 10, and the paper cylinder A bottom folding step of performing a bottom folding of the bottom edge 1F of one of the openings of the paper tube 5, and a method of manufacturing a square bottom paper bag in which the bottom reinforcing material 2 is provided on the inner surface of the bottom portion of the paper tube 5, before the bottom folding step. 5, the bottom reinforcing member 2 is disposed on the inner surface of one side portion of the bottom edge 1F, and the one side portion 11 is folded to the inner surface of the bottom portion with the bottom reinforcing member 2 disposed, and then the other side portion 14 of the bottom edge 1F. Since the bottom reinforcing material 2 is provided on the inner surface of the one side portion 11 of the bottom edge 1F of the paper tube 5 and the one side portion 11 is folded in a state where the bottom portion reinforcing material 2 is arranged before the bottom folding process. By folding the other side portion 14 of the bottom edge 1F so as to overlap with this, the bottom reinforcing member 2 can be provided on the inner surface of the bottom portion 1A simultaneously with the bottom folding. As a result, the bottom reinforcing member 2 can be efficiently incorporated and is suitable for automation.

また、このように本実施例では、請求項２に対応して、底部補強材２の左右の長さは一側部11とほぼ同一であり、一側部11を、左右の側部５Ｓ，５Ｓ間の左右方向折線22Ｓと、この左右方向折線22Ｓの端部と側部５Ｓの底縁１Ｆとの間の斜め折線24Ｓ，24Ｓとから折り畳み、一側部11の左右方向折線22Ｓと連続する側部５Ｓの前後方向折線22Ｚから、底縁１Ｆの側部５Ｓ，５Ｓを折り畳んだ後、左右の側部５Ｓ，５Ｓ間の左右方向折線22Ｓから他側部14を折り畳むから、底部補強材２と共に一側部11を、左右の側部５Ｓ，５Ｓ間の左右方向折線22Ｓと、この左右方向折線22Ｓの端部と側部５Ｓの底縁１Ｆとの間の斜め折線たる下斜め折線24，24とから折り畳むことにより、底部補強材２が紙筒５の底部１Ａに配置され、この後、左右方向折線22Ｚと連続する前後方向折線22Ｚから、側部５Ｓの底縁１Ｆを折り畳んだ後、左右方向折線22Ｚから他側部を折り畳むことにより、底部補強材２を備えた底部１Ａを形成することができる。 Thus, in this embodiment, in correspondence with claim 2, the left and right lengths of the bottom reinforcing member 2 are substantially the same as the one side portion 11, and the one side portion 11 is connected to the left and right side portions 5S, Folded from the left / right fold line 22S between 5S and the oblique fold lines 24S, 24S between the end of the left / right fold line 22S and the bottom edge 1F of the side part 5S, and is continuous with the left / right fold line 22S of the one side part 11 After the side portions 5S and 5S of the bottom edge 1F are folded from the front and rear fold line 22Z of the side portion 5S, the other side portion 14 is folded from the left and right side fold lines 22S between the left and right side portions 5S and 5S. At the same time, the one side portion 11 includes a left and right side fold line 22S between the left and right side portions 5S and 5S, and a lower oblique fold line 24 as an oblique fold line between the end of the left and right direction fold line 22S and the bottom edge 1F of the side portion 5S. By folding from 24, the bottom reinforcing member 2 is arranged on the bottom 1A of the paper tube 5, and then continues to the left-right fold line 22Z. The bottom portion 1A provided with the bottom reinforcing member 2 can be formed by folding the bottom edge 1F of the side portion 5S from the front-rear direction folding line 22Z and then folding the other side portion from the left-right direction folding line 22Z.

また、このように本実施例では、請求項３に対応して、角底紙袋用製袋原紙10の紙筒側部箇所をＭ字状に折り込むから、側部５ＳをＭ字状に折り込んだ紙筒５の底部１Ａ内面に、底部補強材２を設けることができる。 In this way, in this embodiment, the side portion of the paper tube of the square bottom paper bag making base paper 10 is folded in an M shape corresponding to the third aspect, so that the side portion 5S is folded in an M shape. A bottom reinforcing member 2 can be provided on the inner surface of the bottom 1 </ b> A of the paper tube 5.

また、このように本実施例では、請求項４に対応して、一側部11に底部補強材２を取り付けた後、この底部補強材２を取り付けた状態で一側部11を折り畳むから、折り畳み時に一側部11に対して底部補強材２が位置ずれすることがなく、底部補強材２を所定位置に配置することができる。 In this way, in the present embodiment, since the bottom reinforcing member 2 is attached to the one side portion 11 and then the one side portion 11 is folded with the bottom reinforcing member 2 attached , The bottom reinforcing member 2 is not displaced with respect to the one side portion 11 when folded, and the bottom reinforcing member 2 can be arranged at a predetermined position.

また、このように本実施例では、請求項５に対応して、紙筒５の一方の開口の底縁１Ｆを底折して底部１Ａを形成し、その底部１Ａの内面に底部補強材２を設けた角底紙袋において、紙筒５の左右の側部５Ｓ，５Ｓ間の左右方向折線22Ｚとこの左右方向折線22Ｚの端部と側部５Ｓ，５Ｓの底縁１Ｆとの間の斜め折線たる下斜め折線24，24から折り畳まれ、内面に底部補強材２を設けた底縁１Ｆの一側部11と、左右方向折線22Ｓと連続する側部５Ｓ，５Ｓの前後方向折線22Ｚ，22Ｚから一側部11の外面に重ね合わせて折り畳んだ底縁１Ｆの側部５Ｓ，５Ｓと、一側部11の他側の左右方向折線22Ｓから、底縁１Ｆの側部５Ｓの外面に重ね合わせて折り畳んだ底縁５Ｓの他側部14と、を備えるから、製造において、底部補強材２を簡便に設けることができる角形紙袋１を提供することができる。 Thus, in this embodiment, corresponding to claim 5, the bottom edge 1F of one opening of the paper tube 5 is folded to form the bottom 1A, and the bottom reinforcing member 2 is formed on the inner surface of the bottom 1A. In the square bottom paper bag provided with a horizontal folding line 22Z between the left and right side portions 5S and 5S of the paper tube 5, and an oblique folding line between the end of the left and right side folding line 22Z and the bottom edge 1F of the side portions 5S and 5S. From one side portion 11 of the bottom edge 1F which is folded from the slanting lower fold lines 24, 24 and provided with the bottom reinforcement 2 on the inner surface, and from the front and rear fold lines 22Z, 22Z of the side portions 5S, 5S which are continuous with the left-right fold line 22S. From the side portions 5S, 5S of the bottom edge 1F folded and overlapped with the outer surface of the one side portion 11, and the left and right fold line 22S on the other side of the one side portion 11, overlapped with the outer surface of the side portion 5S of the bottom edge 1F. Since the other side portion 14 of the folded bottom edge 5S is provided, the bottom reinforcing member 2 can be simply provided in manufacturing. It is possible to provide a shape bag 1.

また、実施例上の効果として、原紙10を展開した状態で、底部補強材２を取り付けるから、取付工程を簡便に行うことができる。 Further, as an effect of the embodiment, since the bottom reinforcing member 2 is attached in a state where the base paper 10 is unfolded, the attachment process can be easily performed.

図１０は本発明の実施例２を示し、上記実施例１と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、同図に示すように、この例では、下斜め折筋24及び他側斜め折筋25などの折筋を設けることなく、紙筒５の一方の開口の底縁１Ｆの底折を行う例であり、底部補強材２と共に一側部11を、前記左右方向折線22Ｓから内側に折り畳むと共に、その一側部11の左右方向折線22Ｓの端部と底縁１Ｆとの間に、前記下斜め折線24Ｓを形成する。尚、一側部11の両側の折筋６ａ，７ａ箇所は前後方向折線22Ｚ，22Ｚの内面側に沿うように折り込む。このようにして折り込むことにより、一側部11全体を紙袋１の底部１Ａの内面に折り込むことができる。この後、図６に示したように、側部５Ｓ，５Ｓの底縁１Ｆ，１Ｆを前後方向折線22Ｚから前記一側部11に重ね合わせるように折り重ねると共に、他側斜め折線25Ｔ，25Ｔを形成する。 FIG. 10 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof will be omitted. In this example, as shown in FIG. This is an example in which the bottom edge 1F of one opening of the paper tube 5 is folded without providing a folding line such as the diagonal folding line 24 and the other side diagonal folding line 25. Folding inward from the left / right fold line 22S, the lower diagonal fold line 24S is formed between the end of the left / right fold line 22S on one side 11 and the bottom edge 1F. It should be noted that the folding lines 6a and 7a on both sides of the one side portion 11 are folded along the inner surface side of the front and rear fold lines 22Z and 22Z. By folding in this way, the entire side portion 11 can be folded into the inner surface of the bottom portion 1 </ b> A of the paper bag 1. After that, as shown in FIG. 6, the bottom edges 1F, 1F of the side portions 5S, 5S are folded so as to overlap the one side portion 11 from the front-rear direction folding line 22Z, and the other side oblique folding lines 25T, 25T are formed. Form.

このように本実施例のように、各請求項に対応して、上記実施例１と同様な作用・効果を奏し、また、この例のように各工程において、折筋を設けずに、原紙10を折るようにしてもよい。 In this way, as in this embodiment, corresponding to each claim, the same operations and effects as in the above-described embodiment 1 can be achieved. In addition, in each process, a folding line is not provided in each process. 10 may be folded.

以上、本発明の実施例について詳述したが、本発明は前記各実施例に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。例えば、底部補強材は、板状部材としてボール紙以外でも各種の材質のものを用いることができる。また、製袋原紙に底部補強材を貼り付ける時点は、折筋の刻設前であってもよく、製袋原紙を平面的に展開した状態で貼り付けることが好ましいが、底折する前であれば、折筋の外縁に形成された糊代に製袋原紙の他方の外縁を糊付けして紙筒を形成した後でもよい。また、所定サイズに裁断した製袋原紙に底部補強材を貼着する場合に限らず、ロール状に巻き取った巻取紙を引き出しながら、巻取紙に底部補強材を貼り付け、これを所定サイズに切断するように構成してもよい。また、請求項１においては、一側部を折り畳んだ後、他側部を折り畳み、この後、側部を折り畳むようにしても良いし、他側部や側部の形状も適宜選定可能である。 As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to each said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the bottom reinforcing member can be made of various materials other than cardboard as the plate-like member. Moreover, the time of applying the bottom reinforcing material to the bag-making base paper may be before the fold line is engraved, and it is preferable to apply the bag-making base paper in a state of being flatly developed, If there is, the paper sleeve may be formed by pasting the other outer edge of the bag-making base paper to the glue margin formed on the outer edge of the folding line. Also, not only when sticking the bottom reinforcing material to the bag-making base paper cut to a predetermined size, but sticking the bottom reinforcing material to the winding paper while pulling out the rolled-up winding paper, and cutting it to a predetermined size You may comprise as follows. Moreover, in Claim 1, after folding one side part, you may fold another side part, and you may make it fold a side part after this, and the shape of another side part or a side part can also be selected suitably. .

本発明の実施例１の製造方法を示す斜視図であり、製造工程順に、図１（Ａ）は折筋を形成した製袋原紙、図１（Ｂ）は二つ折り中の製袋原紙、図１（Ｃ）は扁平な紙筒を示す。BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the manufacturing method of Example 1 of this invention, FIG. 1 (A) is the bag-making base paper which formed the crease, FIG. 1 (C) indicates a flat paper tube. 同上、紙筒の要部を示し、図２（Ａ）は斜視図、図２（Ｂ）は平面図である。FIG. 2A is a perspective view, and FIG. 2B is a plan view. 同上、製造工程を示す斜視図であり、底縁側を上側の折筋から折り曲げた状態を示す。It is a perspective view which shows a manufacturing process same as the above, and shows the state which bent the bottom edge side from the upper folding line. 同上、製造工程において底縁を開いた状態を示し、図４（Ａ）は斜視図、図４（Ｂ）は平面図を示す。FIG. 4A is a perspective view and FIG. 4B is a plan view showing the state in which the bottom edge is opened in the manufacturing process. 同上、製造工程において底縁の一側部を折り畳んだ状態を示し、図５（Ａ）は斜視図、図５（Ｂ）は平面図を示す。FIG. 5A shows a state in which one side portion of the bottom edge is folded in the manufacturing process, FIG. 5A is a perspective view, and FIG. 5B is a plan view. 同上、製造工程において底縁の側部を折り畳んだ状態を示し、図６（Ａ）は斜視図、図６（Ｂ）は平面図を示す。FIG. 6A is a perspective view, and FIG. 6B is a plan view showing a state in which the side portion of the bottom edge is folded in the manufacturing process. 同上、製造工程において底縁の他側部を折り畳んだ状態を示し、図７（Ａ）は斜視図、図７（Ｂ）は平面図を示す。FIG. 7A shows a state where the other side portion of the bottom edge is folded in the manufacturing process, FIG. 7A is a perspective view, and FIG. 7B is a plan view. 従来例を示す紙袋の斜視図である。It is a perspective view of the paper bag which shows a prior art example. 従来の製造方法を示す斜視図であり、製造工程順に、図９（Ａ）は折筋を形成した製袋原紙、図９（Ｂ）は二つ折り中の製袋原紙、図９（Ｃ）は扁平な紙筒を示す。It is a perspective view which shows the conventional manufacturing method, FIG.9 (A) is the bag-making base paper which formed the crease, FIG.9 (B) is the bag-making base paper in half-folding, FIG.9 (C) is a manufacturing process order. A flat paper tube is shown. 同上、製造工程において底縁を開いた状態を示し、図１０（Ａ）は斜視図、図１０（Ｂ）は平面図を示す。FIG. 10A is a perspective view, and FIG. 10B is a plan view showing the state in which the bottom edge is opened in the manufacturing process.

１ 紙袋
１Ａ 底部
１Ｆ 底縁
２ 底部補強材
５ 紙筒
５Ｓ 側部
10 製袋原紙
11 一側部
14 他側部
22 折筋
22Ｚ 前後方向折線
22Ｓ 左右方向折線
24Ｓ 下斜め折線（斜め折線） 1 Paper Bag 1A Bottom 1F Bottom Edge 2 Bottom Reinforcement Material 5 Paper Tube 5S Side
10 Bag making paper
11 One side
14 Other side
22 Folding line
22Z Folding line
22S left and right fold line
24S Bottom diagonal fold line (diagonal fold line)

Claims (5)

角底紙袋用製袋原紙の紙筒側部箇所を折り込んで前後を開口する紙筒を成形する製筒工程と、前記紙筒の一方の開口の底縁の底折を行う底折工程とを備え、前記紙筒の底部内面に底部補強材を設ける角底紙袋の製造方法において、前記底折工程前に紙筒の底縁の一側部の内面に前記底部補強材を配置し、この底部補強材を配置した状態で前記一側部を前記底部内面に折り畳んで該底部補強材を前記底部内面に配置した後、前記底縁の他側部を折り畳むことを特徴とする角底紙袋の製造方法。 A cylinder-making process for forming a paper cylinder that is opened at the front and back by folding the paper cylinder side portion of the bag-making base paper for the square-bottom paper bag, and a bottom folding process for performing a bottom folding of the bottom edge of one opening of the paper cylinder In the manufacturing method of a square bottom paper bag, wherein the bottom reinforcing material is provided on the inner surface of the bottom of the paper tube, the bottom reinforcing material is disposed on the inner surface of one side portion of the bottom edge of the paper tube before the bottom folding step. after placing the bottom reinforcement member to the inner bottom surface Nde tatami in the state in which the stiffener folding said one side to said inner bottom surface, a corner bottom paper bag, characterized in that folding the other side of the bottom edge Production method. 前記一側部を、左右の前記側部間の左右方向折線と、この左右方向折線の端部と前記側部の底縁との間の斜め折線とから折り畳み、前記一側部の左右方向折線と連続する前記側部の前後方向折線から、前記底縁の前記側部を折り畳んだ後、左右の前記側部間の左右方向折線から前記他側部を折り畳むことを特徴とする請求項１記載の角底紙袋の製造方法。 The one side part is folded from a left-right fold line between the left and right side parts and an oblique fold line between an end of the left-right direction fold line and the bottom edge of the side part, and the left-right fold line of the one side part 2. The fold line is folded from the front-rear fold line of the side part, and the side part of the bottom edge is folded, and then the other side part is folded from the left-right fold line between the left and right side parts. Manufacturing method for square bottom paper bags. 角底紙袋用製袋原紙の紙筒側部箇所をＭ字状に折り込むことを特徴とする請求項１又は２記載の角底紙袋の製造方法。 The method for manufacturing a square bottom paper bag according to claim 1 or 2, wherein a side portion of the paper tube of the base paper for square bottom paper bag is folded in an M shape. 前記一側部に底部補強材を取り付けた後、この底部補強材を取り付けた状態で前記一側部を折り畳むことを特徴とする請求項１〜３のいずれか１項に記載の角底紙袋の製造方法。 The square bottom paper bag according to any one of claims 1 to 3 , wherein after the bottom reinforcing member is attached to the one side portion, the one side portion is folded in a state in which the bottom reinforcing member is attached. Production method. 請求項１記載の角底紙袋の製造方法により製造され、紙筒の一方の開口の底縁を底折して底部を形成し、その底部の内面に底部補強材を設けた角底紙袋において、
前記紙筒の左右の側部間の左右方向折線とこの左右方向折線の端部と前記側部の底縁との間の斜め折線から折り畳まれ、内面に底部補強材を設けた前記底縁の一側部と、
前記左右方向折線と連続する前記側部の前後方向折線から前記一側部の外面に重ね合わせて折り畳んだ前記底縁の前記側部と、
前記一側部の他側の左右方向折線から、前記底縁の前記側部の外面に重ね合わせて折り畳んだ前記底縁の他側部と、
を備えることを特徴とする角底紙袋。 A square bottom paper bag manufactured by the method for manufacturing a square bottom paper bag according to claim 1, wherein the bottom edge of one opening of the paper tube is folded to form the bottom, and the bottom reinforcing material is provided on the inner surface of the bottom.
Folded from the left-right fold line between the left and right side portions of the paper tube and the oblique fold line between the end portion of the left-right fold line and the bottom edge of the side portion, the bottom edge of the bottom edge provided with a bottom reinforcing material on the inner surface One side,
The side portion of the bottom edge folded and overlapped on the outer surface of the one side portion from the front-rear direction folding line of the side portion continuous with the left-right direction folding line,
From the left-right fold line on the other side of the one side part, the other side part of the bottom edge folded and overlapped with the outer surface of the side part of the bottom edge,
A square bottom paper bag characterized by comprising:
JP2005339484A 2005-11-24 2005-11-24 Square bottom paper bag manufacturing method and square bottom paper bag Expired - Fee Related JP4807658B2 (en)

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JPS615738U (en) * 1984-06-18 1986-01-14 株式会社 太洋商会 Fold-in bottom sealed bag with gusset on both sides with bottom reinforcement plate
JPS6124430A (en) * 1984-07-13 1986-02-03 株式会社太洋商会 Manufacture of bottom reinforced bottom gusset turn-in bag
JPH09142489A (en) * 1995-11-22 1997-06-03 Sato Sangyo Kk Square bottom bag
JPH1191012A (en) * 1997-09-22 1999-04-06 New Pack:Kk Method for fitting bottom-reinforcing material in square-bottom paper bag

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