JP3169015U

JP3169015U - Paper bag whose innermost layer is a barrier layer

Info

Publication number: JP3169015U
Application number: JP2011002375U
Authority: JP
Inventors: 森　文男; 文男森; 聡山中
Original assignee: Showa Paxxs Corp
Current assignee: Showa Paxxs Corp
Priority date: 2011-04-27
Filing date: 2011-04-27
Publication date: 2011-07-07
Anticipated expiration: 2021-04-27

Abstract

【課題】異物が紙袋内に入ること及び溶融樹脂を具えた胴貼り部の形成によるトラブルを可及的に防止できるとともに、破袋の発生が可及的に防止できる紙袋を提供する。【解決手段】最内層であるアルミ箔又は蒸着フィルムを含む筒体１２のバリア層２と、該筒体１２のバリア層２を覆うように該筒体１２のバリア層２に重ね合わされる各筒体１４、１５の紙層４、５を具える。筒体１２のバリア層２は、筒体１２にされる際にバリア層２の袋幅方向両端部２ｃ、２ｄがヒートシールされ、ヒートシールされた袋幅方向両端部２ｃ、２ｄよりも袋幅方向中央側で、各筒体１４、１５にされる紙層４、５とともに折り曲げられる。【選択図】図１PROBLEM TO BE SOLVED: To provide a paper bag capable of preventing troubles caused by foreign matter entering the paper bag and forming a body-pasted portion containing a molten resin as much as possible, and also preventing the occurrence of the bag as much as possible. SOLUTION: A barrier layer 2 of a cylinder 12 including an aluminum foil or a vapor-deposited film, which is the innermost layer, and each cylinder superposed on the barrier layer 2 of the cylinder 12 so as to cover the barrier layer 2 of the cylinder 12. It has paper layers 4 and 5 of bodies 14 and 15. When the barrier layer 2 of the tubular body 12 is made into a tubular body 12, both ends 2c and 2d in the bag width direction of the barrier layer 2 are heat-sealed, and the bag width is wider than the heat-sealed both ends 2c and 2d in the bag width direction. On the center side of the direction, it is folded together with the paper layers 4 and 5 formed into the cylinders 14 and 15, respectively. [Selection diagram] Fig. 1

Description

この考案は、最内層がバリア層である紙袋に関し、特に、異物が紙袋内に入ること及び溶融樹脂を具えた胴貼り部の形成によるトラブルを可及的に防止できるとともに破袋の発生を可及的に防止できる紙袋に関する。 The present invention relates to a paper bag whose innermost layer is a barrier layer, and in particular, it can prevent as much as possible troubles caused by foreign matter entering the paper bag and the formation of a cylinder pasting portion including a molten resin, and can also cause broken bags. The present invention relates to a paper bag that can be prevented as much as possible.

一般に、クラフト紙等からなる紙袋では、防湿性、あるいは密封性の向上といった機能を与えるために、紙袋の最外層である紙層の内側に、他の層を重ねるようにした紙袋（紙重袋）が知られている。この２層以上の層から構成された紙袋には、その最内層が、アルミ箔又は蒸着フィルムを含む層で構成された紙袋が提案されている。
このアルミ箔又は蒸着フィルムを含む層は、防湿性及び密封性（この２つの性質をまとめて、バリア性という）が紙層等より高い層であるので、以下、この層を「バリア層」として説明する。 In general, a paper bag made of kraft paper, etc. is a paper bag (paper heavy bag) in which other layers are stacked on the inner side of the paper layer, which is the outermost layer of the paper bag, in order to provide functions such as moisture proofing or improved sealing. )It has been known. As the paper bag composed of two or more layers, a paper bag whose innermost layer is composed of a layer containing an aluminum foil or a vapor deposition film has been proposed.
The layer including the aluminum foil or the vapor-deposited film is a layer having higher moisture resistance and sealing properties (collectively, these two properties are referred to as barrier properties) than a paper layer or the like. Hereinafter, this layer is referred to as a “barrier layer”. explain.

図６は、最内層がバリア層で構成された従来の紙袋の製造の様子及び該従来の紙袋の構造を示す概念斜視図である。
図６で示すように、この紙袋５１は、最内層のバリア層２と、バリア層２を覆う紙層を具えており、ここでは紙袋５１は２層の紙層４、５を具えている。 FIG. 6 is a conceptual perspective view showing a state of manufacturing a conventional paper bag in which the innermost layer is constituted by a barrier layer and the structure of the conventional paper bag.
As shown in FIG. 6, the paper bag 51 includes an innermost barrier layer 2 and a paper layer that covers the barrier layer 2. Here, the paper bag 51 includes two paper layers 4 and 5.

この紙袋５１の製造には、図６の右部に図示したように、通常、ロール３６に巻き取られたシート状のバリア層２と、各ロール３４、３５にそれぞれ巻き取られたシート状の各紙層４、５を用意する。 In the manufacture of the paper bag 51, as shown in the right part of FIG. 6, the sheet-like barrier layer 2 wound around a roll 36 and the sheet-like wound around each roll 34, 35 are usually used. Each paper layer 4 and 5 is prepared.

このロール３６、３４、３５からそれぞれシート状のバリア層（以下「シートのバリア層」という。）２、シート状の各紙層（以下「シートの紙層」という。）４、５を、互いに同じ搬送方向Ａに送り出し、その後、図６の左部に図示したように、該シート２２のバリア層２、シート２４の紙層４およびシート２５の紙層５を、それぞれチューブ状である筒体１２のバリア層２、筒体１４の紙層４、筒体１５の紙層５に加工形成する。 From these rolls 36, 34, 35, sheet-like barrier layers (hereinafter referred to as “sheet barrier layers”) 2, and sheet-like paper layers (hereinafter referred to as “sheet paper layers”) 4, 5 are the same. As shown in the left part of FIG. 6, the barrier layer 2 of the sheet 22, the paper layer 4 of the sheet 24, and the paper layer 5 of the sheet 25 are each formed into a tube-like cylinder 12 as shown in the left part of FIG. The barrier layer 2, the paper layer 4 of the cylindrical body 14, and the paper layer 5 of the cylindrical body 15 are processed and formed.

筒体１２のバリア層２を形成するには、図７（ａ）の１枚のシート２２のバリア層２の、搬送方向Ａに対し平行な方向に沿って形成されたシート２２の幅方向端部２ｃ及び２ｄを、図７（ｂ）で示すように、互いに重ね合わせる。
その後、図７（ｂ）で示すように重ね合わされた端部２ｃ、２ｄとの間に溶融樹脂１１（図７（ｃ））を介在させることにより、端部２ｃ、２ｄを互いに接着させる。すると、筒体１２のバリア層２が形成される。 In order to form the barrier layer 2 of the cylindrical body 12, the width direction end of the sheet 22 formed along the direction parallel to the conveying direction A of the barrier layer 2 of one sheet 22 in FIG. The parts 2c and 2d are overlapped with each other as shown in FIG.
Thereafter, as shown in FIG. 7B, the end portions 2c and 2d are bonded to each other by interposing the molten resin 11 (FIG. 7C) between the overlapped ends 2c and 2d. Then, the barrier layer 2 of the cylinder 12 is formed.

また、このようにして互いに接着された端部２ｃ及び端部２ｄは、紙袋５１の筒体１２に設けられた胴貼り部１０を構成する。この胴貼り部１０は、図７（ｃ）で示すように、筒体１２の胴貼り部１０ではない部分へ向けて一側へ折り曲げられる。
なお、上述した溶融樹脂１１（図７（ｃ））は、縁部２ｃ又は縁部２ｄに、上記搬送方向Ａと平行な方向に沿って線状に塗布されたホットメルト系接着剤である。 In addition, the end 2 c and the end 2 d bonded to each other in this way constitute the body pasting portion 10 provided on the cylinder 12 of the paper bag 51. As shown in FIG. 7C, the body pasting portion 10 is bent to one side toward a portion of the cylindrical body 12 that is not the body pasting portion 10.
The above-described molten resin 11 (FIG. 7C) is a hot-melt adhesive applied in a line along the direction parallel to the transport direction A to the edge 2c or the edge 2d.

上述した図７（ａ）、図７（ｂ）および後述する図７（ｃ）は、いずれも図６の紙袋の最内層であるバリア層の様子を示す概念斜視図である。
特に、図７（ａ）は最内層であるバリア層２がシート２２のバリア層である様子を示す図である。この図７（ａ）では、図７（ｂ）と関連して説明を行う都合上、シート２２のバリア層２が一袋の袋長さＬに切断されている様子を概念的に図示しているが、一袋の袋長さＬに切断されるのは、後述するように筒状体（符号なし）が形成された後である。
また、図７（ｂ）は図７（ａ）のシート２２のバリア層２が筒体１２のバリア層２に加工形成された後、一袋の袋長さＬに切断され、さらに該バリア層２の一方の開口に臨む縁部２ｂがヒートシールされてなる内袋１２ｇの様子を概念的に示した図である。
図７（ｃ）は筒体１２のバリア層２の胴貼り部１０の構造を分かりやすくするために、図７（ｂ）の該バリア層２の一方の開口のヒートシールがおこなわれておらず、胴貼り部１０の端部をめくった様子を概念的に示した要部破断図である。
なお、この図７（ａ）〜（ｃ）、後述する図８及び図９では、図６と同一部分を同一符号で図示している。 FIGS. 7A and 7B described above and FIG. 7C described later are conceptual perspective views showing the state of the barrier layer that is the innermost layer of the paper bag of FIG.
In particular, FIG. 7A is a diagram illustrating a state in which the barrier layer 2 that is the innermost layer is the barrier layer of the sheet 22. FIG. 7A conceptually illustrates a state in which the barrier layer 2 of the sheet 22 is cut into a bag length L for convenience of description in connection with FIG. 7B. However, the bag is cut into the bag length L after the cylindrical body (no symbol) is formed as will be described later.
7B shows that the barrier layer 2 of the sheet 22 of FIG. 7A is processed and formed into the barrier layer 2 of the cylindrical body 12, and then cut into a bag length L of one bag. It is the figure which showed notionally the mode of the inner bag 12g in which the edge part 2b which faces one opening of 2 is heat-sealed.
In FIG. 7C, in order to facilitate understanding of the structure of the body pasting portion 10 of the barrier layer 2 of the cylindrical body 12, the heat sealing of one opening of the barrier layer 2 in FIG. 7B is not performed. FIG. 3 is a fragmentary cutaway view conceptually showing a state in which an end of the body pasting portion 10 is turned.
7A to 7C and FIGS. 8 and 9 described later, the same parts as those in FIG. 6 are denoted by the same reference numerals.

また、図６で示すように、シート２４の紙層４を筒体１４の紙層４に加工形成するには、１枚のシート２４の紙層４の、搬送方向Ａに対し平行な方向に沿って形成されたシート２４の幅方向端部を互いに重ね合わせるとともに、その端部同士の間に紙用の接着剤４２を介在させればよい。
また、シート２５の紙層５を筒体１５の紙層５に加工形成するには、上述したシート２４の紙層４を筒体１４の紙層４に加工形成する方法・手順と同様の方法・手順を行えばよい。
なお、図６で示すように筒体１４、１５の各加工形成と筒体１２の加工形成とは、ほぼ同時に行われる。 Further, as shown in FIG. 6, in order to process and form the paper layer 4 of the sheet 24 into the paper layer 4 of the cylindrical body 14, the paper layer 4 of one sheet 24 is parallel to the transport direction A. The end portions in the width direction of the sheet 24 formed along each other may be overlapped with each other, and a paper adhesive 42 may be interposed between the end portions.
Further, in order to process and form the paper layer 5 of the sheet 25 into the paper layer 5 of the cylinder 15, a method similar to the method and procedure for processing and forming the paper layer 4 of the sheet 24 into the paper layer 4 of the cylinder 14 described above.・ Procedures should be performed.
In addition, as shown in FIG. 6, each process formation of the cylinders 14 and 15 and the process formation of the cylinder 12 are performed substantially simultaneously.

また、上述した筒体１２のバリア層２、筒体１４の紙層４及び筒体１５の紙層５の各形成の際、図６で示すように、筒体１４の紙層４は筒体１２のバリア層２の外側を覆うように配置され、筒体１５の紙層５は筒体１２のバリア層２および筒体１４の紙層４の各外側を覆うように配置される。また、筒体の紙層４、５は筒体１２のバリア層２に重なるように配置される。
このように配置された筒体１２のバリア層２および筒体の紙層４、５とからなる筒状体（以下、単に「筒状体」という。）が、一袋の袋長さＬ（図９（ａ）参照）で裁断される。なお、この裁断は筒状体（符号なし）に対して次々に行われる。
一方、筒状体が一袋長さＬに裁断されると、両端に開口が形成された一袋の袋長さＬの筒状体（符号なし）が形成される。また、この一袋の袋長さＬの筒状体には、図７（ｂ）で示すように、筒体１２のバリア層２に、各開口に臨む縁部２ａ、２ｂが設けられる。
また、この各開口のうち一方の開口に臨む縁部２ｂでは、互いに対向するバリア層２同士を熱融着するヒートシール（以下、単に「ヒートシール」という。）が、搬送方向Ａと直交する方向に沿って行われ、これにより筒体１２のバリア層２に、底部３１が形成される（以下、この底部が形成されたバリア層を「内袋」１２ｇという）。 Further, when each of the barrier layer 2 of the cylinder 12, the paper layer 4 of the cylinder 14, and the paper layer 5 of the cylinder 15 described above is formed, the paper layer 4 of the cylinder 14 is a cylinder as shown in FIG. 6. The paper layer 5 of the cylinder 15 is arranged so as to cover the outer sides of the barrier layer 2 of the cylinder 12 and the paper layer 4 of the cylinder 14. The cylindrical paper layers 4 and 5 are disposed so as to overlap the barrier layer 2 of the cylindrical body 12.
A cylindrical body (hereinafter simply referred to as a “cylindrical body”) composed of the barrier layer 2 of the cylindrical body 12 and the paper layers 4 and 5 of the cylindrical body arranged in this manner is a bag length L ( Cutting is performed in FIG. 9 (a). In addition, this cutting is performed one after another on the cylindrical body (no reference).
On the other hand, when the cylindrical body is cut into one bag length L, a one-bag cylindrical body (no symbol) having a bag length L with openings formed at both ends is formed. Further, as shown in FIG. 7B, the cylindrical body of the bag length L is provided with edge portions 2a and 2b facing the respective openings in the barrier layer 2 of the cylindrical body 12.
Further, at the edge portion 2b facing one of the openings, a heat seal (hereinafter simply referred to as “heat seal”) for heat-sealing the barrier layers 2 facing each other is orthogonal to the transport direction A. The bottom portion 31 is formed in the barrier layer 2 of the cylindrical body 12 (hereinafter, the barrier layer in which the bottom portion is formed is referred to as “inner bag” 12 g).

内袋１２ｇの底部３１が形成される際、一袋の袋長さＬの筒状体には、互いに対向する正面部と背面部とが形成される。
この正面部または背面部のうちの一方には、上記一方の開口に臨む筒体１５の紙層５に第１の封緘紙４１（図９（ａ）参照）が貼着され、他方の開口に臨む筒体１５の紙層５に第２の封緘紙（図示しない）が貼着される。
第１の封緘紙４１が、上記一方の開口を覆うとともに、正面部または背面部のうち他方の筒体１５の紙層５に貼着されると、この一方の開口が封緘されて底部４０（図９（ａ）参照）が形成され、これにより紙袋１が出来上がる。
なお、紙袋１の底部４０は、搬送方向Ａに直交する方向（袋幅方向）に沿って設けられる。また、一袋の袋長さＬの筒状体は、出来上がった紙袋５１の袋本体を構成する。 When the bottom portion 31 of the inner bag 12g is formed, a front portion and a back portion that face each other are formed in a cylindrical body having a bag length L of one bag.
A first sealing paper 41 (see FIG. 9A) is attached to one of the front part and the rear part on the paper layer 5 of the cylindrical body 15 facing the one opening, and the other opening is attached to the other opening. A second sealing paper (not shown) is attached to the paper layer 5 of the facing cylinder 15.
When the first sealing paper 41 covers the one opening and is attached to the paper layer 5 of the other cylindrical body 15 in the front portion or the rear portion, the one opening is sealed and the bottom portion 40 ( 9A) is formed, and the paper bag 1 is thus completed.
The bottom 40 of the paper bag 1 is provided along a direction (bag width direction) orthogonal to the transport direction A. Moreover, the cylindrical body of the bag length L of 1 bag comprises the bag main body of the completed paper bag 51. FIG.

この紙袋５１に内容物（図示しない）を収容するには、封緘されていない一袋の袋長さＬの筒状体の他方の開口（口部）を広げて内容物を充填させればよい。
また紙袋５１に収容物を収容した後、他方の開口に臨む縁部２ａに対し搬送方向Ａと直交する方向に沿ってヒートシールが行われると内袋１２ｇが封緘され、さらに上記第２の封緘紙が、他方の開口を覆うとともに、正面部または背面部のうち他方の筒体１５の紙層５に貼着されると、この他方の開口が封緘され、これによりバリア性を損なうことなく紙袋５１に内容物を収容できる。 In order to store the contents (not shown) in the paper bag 51, the other opening (mouth) of the non-sealed cylindrical body of the bag length L may be expanded and filled with the contents. .
Further, after the contents are stored in the paper bag 51, the inner bag 12g is sealed when the edge 2a facing the other opening is heat-sealed along the direction orthogonal to the conveying direction A, and the second sealing is further performed. When the paper covers the other opening and is attached to the paper layer 5 of the other cylindrical body 15 in the front portion or the rear portion, the other opening is sealed, thereby preventing the paper bag without impairing the barrier property. 51 can accommodate contents.

実用新案登録第３１５６５４１号公報Utility Model Registration No. 3156541

ところで、従来の紙袋５１は、図７（ａ）で示すように最内層のバリア層２は、シート状に開いた状態から、図７（ｂ）で示すように筒体１２のバリア層２に加工形成されたものであるから、シート２２から筒体１２が形成されるまでの間に埃や紙の粉等の異物４５が、最内層のバリア層２に付着する虞があり、バリア層２に異物４５が付着した場合、最終的に出来上がった紙袋５１内に異物４５が入る虞が生じる。特にクリーン度が要求される場合にはこの紙粉等が嫌われる事がある。 By the way, in the conventional paper bag 51, as shown in FIG. 7 (a), the innermost barrier layer 2 is opened from the sheet shape to the barrier layer 2 of the cylindrical body 12 as shown in FIG. 7 (b). Since it is formed by processing, there is a possibility that foreign matter 45 such as dust or paper powder may adhere to the innermost barrier layer 2 until the cylindrical body 12 is formed from the sheet 22. If the foreign matter 45 adheres to the surface, there is a risk that the foreign matter 45 will enter the paper bag 51 that is finally completed. In particular, when a cleanness is required, this paper dust may be disliked.

また、従来の紙袋５１は、溶融樹脂１１を具えた胴貼り部１０を形成する場合に、バリア層２同士の糊として機能する溶融樹脂１１の量（糊量）の増減に関してトラブルが生じ易い。
たとえば、溶融樹脂１１の糊量が少ないと、胴貼り部１０全体に塗布されるべき溶融樹脂１１が部分的に塗布されずに、胴貼り部１０に、互いに対向するバリア層同士が接着されない部分（シールの抜けともいう。）が生じ、これにより紙袋５１の破袋（袋が破れることをいう。）が発生するトラブルがあった。
また、溶融樹脂１１の糊量が多いと、図８の貼り付き部分９ａで示すように、溶融樹脂１１が胴貼り部１０からはみ出し、他の最内層であるバリア層２同士の間に進入して該バリア層２同士が互いに貼りついてしまい、そのため、紙袋５１の他方の開口（口部）を開口させることができずに内容物の収容ができなくなるというトラブルがあった。 Further, when the conventional paper bag 51 forms the body pasting portion 10 including the molten resin 11, troubles are likely to occur regarding the increase or decrease in the amount of the molten resin 11 (glue amount) that functions as the glue between the barrier layers 2.
For example, when the amount of paste of the molten resin 11 is small, the molten resin 11 to be applied to the entire body pasting portion 10 is not partially applied, and the portions where the barrier layers facing each other are not bonded to the body pasting portion 10 (It is also referred to as “missing of the seal”), which causes a trouble that the paper bag 51 is broken (referred to as tearing the bag).
Further, when the amount of paste of the molten resin 11 is large, the molten resin 11 protrudes from the body pasting portion 10 and enters between the barrier layers 2 as other innermost layers, as shown by the pasted portion 9a in FIG. As a result, the barrier layers 2 stick to each other, so that the other opening (mouth) of the paper bag 51 cannot be opened and the contents cannot be accommodated.

また、この溶融樹脂１１の量の増減のほかにも、従来の紙袋５１では、溶融樹脂１１を具えた胴貼り部１０の形成によるトラブルが生じていた。
たとえば、胴貼り部１０により筒体１２のバリア層２を形成する際に、溶融樹脂１１を溶融する熱によって、溶融樹脂１１と直接接しないバリア層２同士が互いに貼りついてしまい、紙袋５１の他方の開口（口部）を開口させることができずに内容物の収容ができなくなるというトラブルがあった。
なお、上記した図８は、紙袋の最内層であるバリア層の断面を示す図６の紙袋の要部概念破断断面図である。
また、たとえば、この従来の紙袋５１では、胴貼り部１０には、この胴貼り部１０を形成している筒体１２のバリア層２間に、冷却・固化した溶融樹脂１１が介在するので、胴貼り部１０と、溶融樹脂１１の介在がない胴貼り部１０でない部分との間に段差が生じ易い。
この段差の発生によって、従来の紙袋５１では、ヒートシールによって、内袋１２ｇの底部３１の形成又は内袋１２ｇの封緘を行う場合に、バリア層２同士の熱融着が困難となり、また確実に行われない箇所が生じるというトラブルがあった。 In addition to the increase / decrease in the amount of the molten resin 11, the conventional paper bag 51 has a trouble due to the formation of the body pasting portion 10 including the molten resin 11.
For example, when the barrier layer 2 of the cylindrical body 12 is formed by the body pasting portion 10, the barrier layers 2 that are not in direct contact with the molten resin 11 are adhered to each other due to heat that melts the molten resin 11, and the other side of the paper bag 51. There was a problem that it was impossible to open the opening (mouth part) and the contents could not be accommodated.
Note that FIG. 8 described above is a conceptual fragmentary sectional view of the paper bag of FIG. 6 showing a cross section of the barrier layer that is the innermost layer of the paper bag.
Further, for example, in this conventional paper bag 51, the cylinder pasting part 10 has the cooled and solidified molten resin 11 interposed between the barrier layers 2 of the cylindrical body 12 forming the cylinder pasting part 10. A step is likely to occur between the body pasting portion 10 and a portion that is not the body pasting portion 10 where the molten resin 11 is not present.
Due to the occurrence of this step, in the conventional paper bag 51, when the bottom 31 of the inner bag 12g is formed or the inner bag 12g is sealed by heat sealing, it becomes difficult to heat-bond the barrier layers 2 to each other. There was a trouble that some parts were not done.

上述した欠点を解決する紙袋として、従来、図９（ａ）及び図９（ｂ）で示すように、最内層がバリア層２で構成された紙袋５２であって、バリア層２は、筒体１２にされる際にバリア層２の袋幅方向両端部２ｃ、２ｄがそれぞれヒートシールされ、かつ紙層４、５で覆われる紙袋が提案されている（特許文献１）。
なお、図９（ａ）及び図９（ｂ）は、図６の紙袋とは別の、従来の紙袋を示す図であり、特に図９（ａ）は該紙袋の概念正面図であり、図９（ｂ）は図９（ａ）のＤＤ概念断面図である。 Conventionally, as shown in FIGS. 9A and 9B, a paper bag 52 in which the innermost layer is composed of a barrier layer 2 is used as a paper bag for solving the above-described drawbacks. 12, a paper bag is proposed in which both ends 2c and 2d in the bag width direction of the barrier layer 2 are heat-sealed and covered with the paper layers 4 and 5 (Patent Document 1).
9 (a) and 9 (b) are diagrams showing a conventional paper bag different from the paper bag of FIG. 6. In particular, FIG. 9 (a) is a conceptual front view of the paper bag. 9 (b) is a DD conceptual cross-sectional view of FIG. 9 (a).

この従来の紙袋５１では、図９（ｂ）で示すように、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さ（周長さ）と、該筒体１２のバリア層２を覆う筒体１４の紙層４の胴部の内周面の周囲の長さとが相違する。また、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さ（周長さ）と該筒体１２のバリア層２を覆う筒体１５の紙層５の胴部の内周面の周囲の長さとが、互いに相違する。
図９の符号Ｗは、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さと、筒体１４の紙層４の胴部の内周面の周囲の長さの相違によって表れる、紙袋５１の袋幅方向端部５２ｃ、５２ｄでの長さの相違を概念的に図示している。
なお、バリア層２の胴部２ｅとは、筒体１２のバリア層２の周面をいい、紙層４、５の各胴部とは、各筒体１４、１５の紙層４、５の周面をいう。
このように、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さが、筒体１４の紙層４の胴部の内周面の周囲の長さ又は筒体１５の紙層５の各胴部の内周面の周囲の長さと相違すると、内容物による負荷が筒体１２のバリア層２及び各筒体１４、１５の紙層４、５のうち、筒体１２のバリア層２だけにかかりやすい。
そのため、紙袋５２の袋強度が弱く、ヒートシールされた袋幅方向の各端部２ｃ、２ｄから破袋が発生するおそれがあった。
この破袋の発生に対する対策として、従来、より強度の高い材質のバリア層２を使用するという方法が採られていた。しかし、このように、より強度の高い材質のバリア層２を使用した場合であっても、紙袋５２に収容する内容物の種類によっては、袋強度が弱く、そのため破袋が発生するおそれがあるという問題、及びより強度の高い材質のバリア層２を使用すると、その分、紙袋５２の材料コストが高くなり、その結果、紙袋５２の製造コストが高くなるという問題があった。 In this conventional paper bag 51, as shown in FIG. 9 (b), the peripheral length (peripheral length) of the outer peripheral surface of the barrel portion 2e of the barrier layer 2 of the cylindrical body 12, and the barrier layer of the cylindrical body 12 2 is different from the peripheral length of the inner peripheral surface of the body portion of the paper layer 4 of the cylindrical body 14 covering 2. Further, the peripheral length (peripheral length) of the outer peripheral surface of the barrel portion 2 e of the barrier layer 2 of the cylinder 12 and the inner periphery of the trunk portion of the paper layer 5 of the cylinder 15 covering the barrier layer 2 of the cylinder 12. The perimeter of the surface is different from each other.
The symbol W in FIG. 9 is expressed by the difference between the peripheral length of the outer peripheral surface of the barrel portion 2e of the barrier layer 2 of the cylindrical body 12 and the peripheral length of the inner peripheral surface of the cylindrical portion of the paper layer 4 of the cylindrical body 14. FIG. 4 conceptually illustrates the difference in length between the end portions 52c and 52d of the paper bag 51 in the bag width direction.
In addition, the trunk | drum 2e of the barrier layer 2 means the surrounding surface of the barrier layer 2 of the cylinder 12, and each trunk | drum of the paper layers 4 and 5 is the paper layers 4 and 5 of each cylinder 14 and 15. Refers to the circumference.
Thus, the length of the outer peripheral surface of the barrel portion 2e of the barrier layer 2 of the cylindrical body 12 is the length of the inner peripheral surface of the barrel portion of the paper layer 4 of the cylindrical body 14 or the paper of the cylindrical body 15. If the length of the inner peripheral surface of each body portion of the layer 5 is different from the length of the inner peripheral surface, the load caused by the contents of the cylinder 12 is the barrier layer 2 of the cylinder 12 and the paper layers 4 and 5 of the cylinders 14 and 15. It tends to be applied only to the barrier layer 2.
Therefore, the bag strength of the paper bag 52 is weak, and there is a possibility that the bag breakage may occur from the end portions 2c and 2d in the bag width direction that are heat-sealed.
As a countermeasure against the occurrence of the broken bag, a method of using a barrier layer 2 made of a material having higher strength has been conventionally used. However, even when the barrier layer 2 made of a material having higher strength is used as described above, depending on the type of contents contained in the paper bag 52, the bag strength is weak, so that bag breaking may occur. When the barrier layer 2 made of a material having higher strength is used, the material cost of the paper bag 52 is increased accordingly, and as a result, the manufacturing cost of the paper bag 52 is increased.

上述した事情に鑑み、本考案は、最内層がバリア層を含む紙袋であって、異物が紙袋内に入ること及び溶融樹脂を具えた胴貼り部の形成によるトラブルを可及的に防止できるとともに破袋の発生が可及的に防止できる紙袋を提供することを目的とする。 In view of the above-described circumstances, the present invention is a paper bag in which the innermost layer includes a barrier layer, and it is possible to prevent as much as possible troubles caused by foreign matter entering the paper bag and the formation of a cylinder pasting portion including a molten resin. An object of the present invention is to provide a paper bag capable of preventing the occurrence of broken bags as much as possible.

本考案は、最内層であるアルミ箔又は蒸着フィルムを含む筒体のバリア層と、該筒体バリア層を覆うように該筒体バリア層に重ね合わされる筒体の紙層を具えた紙袋であって、前記筒体のバリア層は、筒体にされる際にバリア層の袋幅方向両端部がヒートシールされ、ヒートシールされた前記袋幅方向両端部よりも袋幅方向中央側で、筒体にされる紙層とともに折り曲げられることを特徴としている。 The present invention is a paper bag comprising a cylindrical barrier layer including an aluminum foil or a vapor deposition film as an innermost layer, and a cylindrical paper layer superimposed on the cylindrical barrier layer so as to cover the cylindrical barrier layer. And the barrier layer of the cylindrical body is heat-sealed at both ends in the bag width direction of the barrier layer when being formed into a cylindrical body, and at the center side in the bag width direction than the both ends of the bag width direction that are heat-sealed, It is characterized by being folded together with a paper layer that is made into a cylinder.

本考案の紙袋は、筒体のバリア層が、筒体にされる際にバリア層の袋幅方向両端部がヒートシールされ、ヒートシールされた前記袋幅方向両端部よりも袋幅方向中央側で、筒体にされる紙層とともに折り曲げられることとしたから、本考案の、最内層がバリア層を含む紙袋は、異物が紙袋内に入ること及び溶融樹脂を具えた胴貼り部の形成によるトラブルを可及的に防止できるとともに破袋の発生が可及的に防止できた。 In the paper bag of the present invention, when the cylindrical barrier layer is formed into a cylindrical body, both end portions in the bag width direction of the barrier layer are heat-sealed, and the center side in the bag width direction from both end portions in the bag width direction that are heat-sealed Therefore, the paper bag including the barrier layer as the innermost layer of the present invention is formed by the formation of the body pasting portion including the foreign material and the molten resin. Troubles were prevented as much as possible, and the occurrence of broken bags was prevented as much as possible.

図１（ａ）及び図１（ｂ）は本考案の実施例の紙袋を示す図であり、特に図１（ａ）は該紙袋の概念正面図であり、図１（ｂ）は図１（ａ）のＢＢ概念断面図である。1 (a) and 1 (b) are views showing a paper bag according to an embodiment of the present invention. In particular, FIG. 1 (a) is a conceptual front view of the paper bag, and FIG. It is BB conceptual sectional drawing of a). 図２（ａ）及び図２（ｂ）は図１の紙袋１から、バリア層のみを取り出した様子を示す概念図であり、特に図２（ａ）は内袋にされたバリア層の概念正面図であり、図２（ｂ）は図２（ａ）のＣＣ概念断面図である。2 (a) and 2 (b) are conceptual diagrams showing a state in which only the barrier layer is taken out from the paper bag 1 in FIG. 1, and particularly FIG. 2 (a) is a conceptual front view of the barrier layer formed in the inner bag. FIG. 2 (b) is a CC conceptual cross-sectional view of FIG. 2 (a). 図３は図１の紙袋の製造の様子のうち、筒体のバリア層を製造する様子および筒体のバリア層の構造を示す概念斜視図である。FIG. 3 is a conceptual perspective view showing a state in which a cylindrical barrier layer is manufactured and a structure of the cylindrical barrier layer in the state of manufacturing the paper bag of FIG. 図４は図１の紙袋を製造する様子及び該紙袋の構造を概念的に示す概念斜視図である。FIG. 4 is a conceptual perspective view conceptually showing the state of manufacturing the paper bag of FIG. 1 and the structure of the paper bag. 図５は図１の紙袋の強度を測定する落袋試験の結果を、従来の紙袋（図９）のものと比較して示す表等である。FIG. 5 is a table showing the results of a drop bag test for measuring the strength of the paper bag of FIG. 1 in comparison with the conventional paper bag (FIG. 9). 図６は最内層がバリア層で構成された従来の紙袋の製造の様子及び該従来の紙袋の構造を示す概念斜視図である。FIG. 6 is a conceptual perspective view showing a state of manufacturing a conventional paper bag in which the innermost layer is constituted by a barrier layer and the structure of the conventional paper bag. 図７（ａ）、図７（ｂ）および図７（ｃ）はいずれも図６の紙袋の最内層であるバリア層の様子を示す概念斜視図である。FIGS. 7A, 7B, and 7C are conceptual perspective views showing the state of the barrier layer that is the innermost layer of the paper bag of FIG. 図８は紙袋の最内層であるバリア層の断面を示す図６の紙袋の要部概念破断断面図である。FIG. 8 is a conceptual fragmentary sectional view of the paper bag of FIG. 6 showing a cross section of the barrier layer which is the innermost layer of the paper bag. 図９（ａ）及び図９（ｂ）は図６の紙袋とは別の、従来の紙袋を示す図であり、特に図９（ａ）は該紙袋の概念正面図であり、図９（ｂ）は図９（ａ）のＤＤ概念断面図である。9 (a) and 9 (b) are views showing a conventional paper bag different from the paper bag of FIG. 6, and particularly FIG. 9 (a) is a conceptual front view of the paper bag, and FIG. ) Is a DD conceptual cross-sectional view of FIG.

本考案の紙袋について、以下、実施例の紙袋に基づいて、詳細に説明する。 Hereinafter, the paper bag of the present invention will be described in detail based on the paper bag of the embodiment.

図１（ａ）及び図１（ｂ）は本考案の実施例の紙袋を示す図であり、特に図１（ａ）は該紙袋の概念正面図であり、図１（ｂ）は図１（ａ）のＢＢ概念断面図である。
なお、図１乃至後述する図５では、図６乃至図９と同一部分を同一符号で示している。 1 (a) and 1 (b) are views showing a paper bag according to an embodiment of the present invention. In particular, FIG. 1 (a) is a conceptual front view of the paper bag, and FIG. It is BB conceptual sectional drawing of a).
1 to FIG. 5 described later, the same parts as those in FIGS. 6 to 9 are denoted by the same reference numerals.

紙袋１は、図１（ａ）及び図１（ｂ）で示すように、最内層である筒体１２のバリア層２と、該筒体１２のバリア層２を覆うように該筒体１２のバリア層２に重ね合わされる各筒体１４、１５の紙層４、５とからなる両端開口の筒状体を、一袋の袋長さＬに断裁してなる両端開口の一袋の袋長さＬの筒状体（符号なし）を具えたものである。
また、この紙袋１は、図１（ａ）で示すように、一袋の袋長さＬの両端開口の筒状体の一方の開口の封緘によって、底部４０が形成される紙袋である。 As shown in FIGS. 1A and 1B, the paper bag 1 includes a barrier layer 2 of the cylinder 12 that is the innermost layer, and a barrier layer 2 of the cylinder 12 that covers the barrier layer 2 of the cylinder 12. The bag length of one bag opened at both ends, which is formed by cutting a cylindrical body having openings at both ends formed of the paper layers 4 and 5 of the cylinders 14 and 15 superimposed on the barrier layer 2 into a bag length L of one bag. It is provided with a cylindrical body (not indicated) having a length L.
In addition, as shown in FIG. 1A, the paper bag 1 is a paper bag in which a bottom portion 40 is formed by sealing one opening of a cylindrical body that is open at both ends with a bag length L of one bag.

一袋の袋長さＬの筒状体は、図１（ｂ）で示すように筒体１２のバリア層２と、該バリア層２を覆うように該筒体１２のバリア層２に重ね合わされる筒体１４、１５の紙層４、５を具えている。
なお、バリア層２は、アルミ箔又は蒸着フィルムを含む層であり、このバリア層２は紙袋１の最内層の層として配置されている。 A cylindrical body having a bag length L is overlapped with the barrier layer 2 of the cylindrical body 12 and the barrier layer 2 of the cylindrical body 12 so as to cover the barrier layer 2 as shown in FIG. The paper layers 4 and 5 of the cylindrical bodies 14 and 15 are provided.
The barrier layer 2 is a layer containing an aluminum foil or a vapor deposition film, and the barrier layer 2 is disposed as the innermost layer of the paper bag 1.

図２（ａ）及び図２（ｂ）は図１の紙袋から、バリア層のみを取り出した様子を示す概念図であり、特に図２（ａ）は内袋にされたバリア層の概念正面図であり、図２（ｂ）は図２（ａ）のＣＣ概念断面図である。
図２（ａ）で示すように、一袋の袋長さＬの両端開口の筒状体を構成する筒体１２のバリア層２は、筒体１２にされる際にバリア層２の袋幅方向両端部２ｃ、２ｄがヒートシールされたものである。このヒートシールされた端部２ｃ、２ｄを図２（ａ）および図２（ｂ）等では、ヒートシール部Ｓとして図示している。
また、筒体１２のバリア層２は、１枚のシート２４（図４）の紙層４の幅方向両端を重ねてなる筒体１４の紙層４、１枚のシート２５（図４）の紙層５の幅方向両端を重ねてなる筒体１５の紙層５をそれぞれ形成する際に、ヒートシール部Ｓよりも中央側で折り曲げられる。図２（ａ）、図２（ｂ）及び後述する図４では、この折り曲げられる筒体１２のバリア層２の折り曲げ線Ｙで図示している。 2 (a) and 2 (b) are conceptual diagrams showing a state in which only the barrier layer is taken out from the paper bag of FIG. 1, and in particular, FIG. 2 (a) is a conceptual front view of the barrier layer formed as an inner bag. FIG. 2B is a CC conceptual cross-sectional view of FIG.
As shown in FIG. 2 (a), the barrier layer 2 of the cylindrical body 12 constituting the cylindrical body with the opening length at both ends of one bag is the bag width of the barrier layer 2 when the cylindrical body 12 is formed. The direction both ends 2c and 2d are heat-sealed. The heat-sealed end portions 2c and 2d are illustrated as a heat-sealed portion S in FIGS. 2 (a) and 2 (b).
Further, the barrier layer 2 of the cylindrical body 12 is composed of the paper layer 4 of the cylindrical body 14 and the sheet 25 (FIG. 4) of the cylindrical body 14 that are stacked on both ends in the width direction of the paper layer 4 of the single sheet 24 (FIG. 4). When forming the paper layer 5 of the cylindrical body 15 formed by overlapping both ends in the width direction of the paper layer 5, the paper layer 5 is bent on the center side with respect to the heat seal portion S. 2 (a), 2 (b) and FIG. 4 to be described later, this is indicated by a fold line Y of the barrier layer 2 of the cylinder 12 to be bent.

図３は、図１の紙袋の製造の様子のうち、筒体のバリア層を製造する様子および筒体のバリア層２の構造を示す概念斜視図である。
図３に示すように、筒体１２のバリア層２を加工形成するには、２つのロール３２にそれぞれ巻き取られた原材料のシート２２のバリア層２を用意する。すなわち、２枚のシート２２のバリア層２が筒体１２のバリア層２の原材料である。 FIG. 3 is a conceptual perspective view showing a state in which the cylindrical barrier layer is manufactured and the structure of the cylindrical barrier layer 2 in the state of manufacturing the paper bag of FIG. 1.
As shown in FIG. 3, in order to form the barrier layer 2 of the cylindrical body 12, the barrier layer 2 of the raw material sheet 22 wound around the two rolls 32 is prepared. That is, the barrier layer 2 of the two sheets 22 is a raw material of the barrier layer 2 of the cylindrical body 12.

この２つのロール３２からそれぞれシート２２のバリア層２２を互いに同じ搬送方向Ａに送り出し、その後、図３に図示したように、各ロール３２のシート２２のバリア層２とを互いに対向させるとともに重ね合わせる。
この互いに対向した２枚のシート２２の、搬送方向Ａに対し平行な方向に沿って形成された両端部は、互いに対向する。この互いに対向する両端部、すなわち一方の端部２ｃ同士および他方の端部２ｄ同士をそれぞれヒートシールすることによって、筒体１２のバリア層２を加工形成することができる。
このヒートシールは、従前から用いられている熱板等の治具を用いて行われる。 The barrier layer 22 of the sheet 22 is sent out from the two rolls 32 in the same conveying direction A, and then the barrier layer 2 of the sheet 22 of each roll 32 is opposed to each other and overlapped as shown in FIG. .
Both end portions of the two sheets 22 facing each other formed along the direction parallel to the conveyance direction A are opposed to each other. The barrier layer 2 of the cylindrical body 12 can be processed and formed by heat-sealing the opposite ends, that is, the one end 2c and the other end 2d.
This heat sealing is performed using a jig such as a hot plate that has been used.

より具体的には、シート２２のバリア層２の一方の端部２ｃを、これに対向するもう一つのシート２２のバリア層２の一方の端部２ｃとヒートシールする。また、シート２２のバリア層２の他方の端部２ｄを、これに対向する前記もう一つのシート２２のバリア層２の他方の端部２ｄとをヒートシールする。すると、筒体１２のバリア層２が形成され、またヒートシール部Ｓが形成される。
なお、各端部２ｃ、２ｄは、バリア層２が筒体１２にされる際、バリア層２の袋幅方向両端部に位置するものであり、各端部２ｃ、２ｄはそれぞれ少なくとも各バリア層２のシート２２のシート幅方向端の縁を含んでいる。また、ヒートシール部Ｓは、上記搬送方向Ａと平行な方向に沿って線状に形成される。
また、図３で示すように筒体１２にされたバリア層２は、いったんロール３３に巻き取られる。 More specifically, one end portion 2c of the barrier layer 2 of the sheet 22 is heat-sealed with one end portion 2c of the barrier layer 2 of the other sheet 22 opposed thereto. Further, the other end 2d of the barrier layer 2 of the sheet 22 is heat-sealed with the other end 2d of the barrier layer 2 of the other sheet 22 facing the other end 2d. Then, the barrier layer 2 of the cylindrical body 12 is formed, and the heat seal portion S is formed.
The end portions 2c and 2d are positioned at both end portions in the bag width direction of the barrier layer 2 when the barrier layer 2 is formed into the cylindrical body 12, and each end portion 2c and 2d is at least each barrier layer. The edge of the sheet | seat width direction edge of the 2 sheet | seat 22 is included. Further, the heat seal portion S is formed in a linear shape along a direction parallel to the transport direction A.
Further, as shown in FIG. 3, the barrier layer 2 formed into the cylindrical body 12 is once wound around the roll 33.

図４は、図１の紙袋を製造する様子及び該紙袋の構造を概念的に示す概念斜視図である。
図４で示すように、紙袋１の製造には、各ロール３４、３５にそれぞれ巻き取られたシート２４の紙層４、シート２５の紙層５を用意するとともに、上述のロール３３に巻き取られた筒体１２のバリア層２とを用意する。このロール３３は、従来のロール３６（図６）に代わるものである。 FIG. 4 is a conceptual perspective view conceptually showing the state of manufacturing the paper bag of FIG. 1 and the structure of the paper bag.
As shown in FIG. 4, the paper bag 1 is manufactured by preparing the paper layer 4 of the sheet 24 and the paper layer 5 of the sheet 25 wound around the rolls 34 and 35, and winding the paper bag 1 around the roll 33 described above. The barrier layer 2 of the cylinder 12 thus prepared is prepared. This roll 33 replaces the conventional roll 36 (FIG. 6).

これらのロール３３、３４、３５からそれぞれ筒体１２のバリア層２、シート１４の紙層４及びシートの１５の紙層５を、互いに同じ搬送方向Ａに送り出す。 From these rolls 33, 34, and 35, the barrier layer 2 of the cylinder 12, the paper layer 4 of the sheet 14, and the paper layer 5 of 15 of the sheet are sent out in the same conveying direction A.

その後、図４に図示したようにシート２４、２５の各紙層４、５を、それぞれ筒体１４、１５の各紙層４、５に加工形成する。 Thereafter, as shown in FIG. 4, the paper layers 4 and 5 of the sheets 24 and 25 are processed and formed on the paper layers 4 and 5 of the cylinders 14 and 15, respectively.

シート２４の紙層４を筒体１４の紙層４に加工形成するには、１枚のシート２４の紙層４の、搬送方向Ａに対し平行な方向に沿って形成されたシート２４の幅方向端部を互いに重ね合わせるとともに、その端部同士の間に紙用の接着剤４２を介在させればよい。
また、シート２５の紙層５を筒体１５の紙層５に加工形成するには、上述したシート２４の紙層４を筒体１４の紙層４に加工形成する方法・手順と同様の方法・手順を行えばよい。 In order to process and form the paper layer 4 of the sheet 24 into the paper layer 4 of the cylindrical body 14, the width of the sheet 24 formed along the direction parallel to the conveying direction A of the paper layer 4 of one sheet 24. The direction end portions may be overlapped with each other, and a paper adhesive 42 may be interposed between the end portions.
Further, in order to process and form the paper layer 5 of the sheet 25 into the paper layer 5 of the cylinder 15, a method similar to the method and procedure for processing and forming the paper layer 4 of the sheet 24 into the paper layer 4 of the cylinder 14 described above.・ Procedures should be performed.

また、上述した筒体１４、１５の紙層４、５の形成は、図４で示すように、筒体１４、１５の紙層４、５が筒体１２のバリア層２の外周を覆うように配置され、また筒体１４、１５の紙層４、５は、筒体１２のバリア層２に重ね合わせて配置される。
また、シート２４、２５の紙層４、５を筒体１４、１５の紙層４、５に形成する際、図４の折り曲げ線Ｙで示すように、該筒体１２のバリア層２は、ヒートシールされた袋幅方向両端部２ｃ、２ｄ（ヒートシール部Ｓ）よりも袋幅方向中央側で、筒体１４、１５にされる紙層４、５とともに、折り曲げられる。
なお、折り曲げられた筒体１２のバリア層２は、各筒体１４、１５の紙層４、５によって覆われる。 Further, the formation of the paper layers 4 and 5 of the cylinders 14 and 15 described above is performed so that the paper layers 4 and 5 of the cylinders 14 and 15 cover the outer periphery of the barrier layer 2 of the cylinder 12 as shown in FIG. Further, the paper layers 4 and 5 of the cylinders 14 and 15 are arranged so as to overlap the barrier layer 2 of the cylinder 12.
Further, when the paper layers 4 and 5 of the sheets 24 and 25 are formed on the paper layers 4 and 5 of the cylinders 14 and 15, as indicated by the fold line Y in FIG. It is bent together with the paper layers 4 and 5 that are formed into the cylindrical bodies 14 and 15 on the center side in the bag width direction with respect to both ends 2c and 2d (heat seal portion S) that are heat sealed.
The barrier layer 2 of the folded cylinder 12 is covered with the paper layers 4 and 5 of the cylinders 14 and 15.

この筒体１２のバリア層２の、ヒートシールされた袋幅方向両端部２ｃ、２ｄよりも袋幅方向中央側での折り曲げは、図４の折り曲げ線Ｙで示すように、搬送方向Ａと平行な方向に沿って行われる。
また、この折り曲げは、図２（ａ）の符号Ｘで示すように、筒体１２のバリア層２の袋幅方向両端部２ｃ、２ｄの各縁から１５ｍｍ程度、袋幅方向中央よりで行われる。 The folding of the barrier layer 2 of the cylindrical body 12 on the center side in the bag width direction with respect to the heat-sealed both ends 2c and 2d in the bag width direction is parallel to the conveyance direction A as indicated by a fold line Y in FIG. Along the direction.
Further, as shown by the symbol X in FIG. 2A, this bending is performed from the center of the bag width direction about 15 mm from each edge of the bag width direction both ends 2c and 2d of the barrier layer 2 of the cylindrical body 12. .

次に、折り曲げられた最内層である筒体１２のバリア層２と、該バリア層２を覆うように該バリア層に重ね合わされる筒体１４、１５とからなる両端開口の筒状体が、図１（ａ）で示すように、一袋の袋長さＬで裁断される。裁断方向は、搬送方向Ａに直交する方向に沿った方向である。
なお、この裁断は筒状体（符号なし）に対して次々に行われる。 Next, a cylindrical body having an opening at both ends composed of the barrier layer 2 of the cylindrical body 12 that is the folded innermost layer and the cylindrical bodies 14 and 15 that are superimposed on the barrier layer so as to cover the barrier layer 2, As shown in FIG. 1 (a), it is cut with a bag length L of one bag. The cutting direction is a direction along a direction orthogonal to the conveyance direction A.
In addition, this cutting is performed one after another on the cylindrical body (no reference).

一方、筒状体が一袋の袋長さＬに裁断されると、図１（ａ）で示すように両端に開口が形成された一袋の袋長さＬの筒状体（符号なし）が形成される。この一袋の袋長さＬの筒状体では筒体１２のバリア層２、筒体１４の紙層４、筒体１５の紙層５はいずれも一袋の袋長さＬに裁断される。
また、一袋の袋長さＬの筒状体では、筒体１２のバリア層２に、各縁部２ａ、２ｂ（図２（ａ））が臨む開口がそれぞれ設けられる。 On the other hand, when the cylindrical body is cut to a bag length L of one bag, as shown in FIG. 1 (a), the cylindrical body of one bag length L having openings formed at both ends (no reference) Is formed. In this cylindrical body of the bag length L, the barrier layer 2 of the cylinder 12, the paper layer 4 of the cylinder 14, and the paper layer 5 of the cylinder 15 are all cut to the bag length L of one bag. .
Moreover, in the cylindrical body of the bag length L of one bag, the opening which each edge part 2a, 2b (FIG. 2 (a)) faces is provided in the barrier layer 2 of the cylindrical body 12, respectively.

これら各開口のうち一方の開口に臨む縁部２ｂでは、図２（ａ）で示すように搬送方向Ａと直交する方向に沿ってヒートシールが行われ、これにより筒体１２のバリア層２に底部３１が形成される。また、底部３１の形成によりバリア層２の内袋１２ｇが形成される。
なお、底部３１のヒートシールは従来の紙袋５１、５２と同様に熱板等の治具を用いて行われる。 At the edge 2b facing one of the openings, heat sealing is performed along the direction orthogonal to the transport direction A as shown in FIG. 2 (a), whereby the barrier layer 2 of the cylinder 12 is formed. A bottom 31 is formed. Moreover, the inner bag 12g of the barrier layer 2 is formed by forming the bottom 31.
The heat sealing of the bottom 31 is performed using a jig such as a hot plate as in the conventional paper bags 51 and 52.

内袋１２ｇの底部３１が形成される際、一袋の袋長さＬの筒状体には、互いに対向する正面部と背面部とが形成される。
この正面部または背面部のうちの一方には、図１（ａ）で示すように、上記一方の開口に臨む筒体１５の紙層５に第１の封緘紙４１が貼着され、他方の開口に臨む筒体１５の紙層５に第２の封緘紙（図示しない）が貼着される。
第１の封緘紙４１が上記した一方の開口を覆うとともに正面部または背面部のうちの他方の筒体１５の紙層５に貼着されると、この一方の開口が封緘されて底部４０（図１（ａ））が形成され、これにより紙袋１が出来上がる。
なお、紙袋の底部４０は、搬送方向Ａに直交する方向（袋幅方向）に沿って設けられる。また、一袋の袋長さＬの筒状体は、出来上がった紙袋５１の袋本体を構成する。 When the bottom portion 31 of the inner bag 12g is formed, a front portion and a back portion that face each other are formed in a cylindrical body having a bag length L of one bag.
As shown in FIG. 1 (a), a first sealing paper 41 is adhered to one of the front part and the rear part on the paper layer 5 of the cylindrical body 15 facing the one opening. A second sealing paper (not shown) is attached to the paper layer 5 of the cylinder 15 facing the opening.
When the first sealing paper 41 covers the above-described one opening and is attached to the paper layer 5 of the other cylindrical body 15 of the front part or the rear part, this one opening is sealed and the bottom 40 ( 1 (a)) is formed, whereby the paper bag 1 is completed.
The bottom portion 40 of the paper bag is provided along a direction (bag width direction) orthogonal to the transport direction A. Moreover, the cylindrical body of the bag length L of 1 bag comprises the bag main body of the completed paper bag 51. FIG.

この紙袋１に内容物（図示しない）を収容するには、一袋の袋長さＬの筒状体の他方の開口（口部）１ａを広げて内容物を充填させればよい。
また紙袋１に収容物を収容した後、他方の開口に臨む縁部２ａに対し搬送方向Ａと直交する方向に沿ってヒートシールが行われると内袋１２ｇが封緘され、さらに上記第２の封緘紙が、他方の開口を覆うとともに、正面部または背面部のうちの他方の筒体１５の紙層５に貼着されると、この他方の開口が封緘され、これによりバリア性を損なうことなく紙袋１に内容物を収容できる。
なお、内容物を収容し口部を封緘した紙袋１を開封して内容物を取り出すには、はさみ等によって紙袋１の胴部１ｅ等から開封すればよい。 In order to store the contents (not shown) in the paper bag 1, the other opening (mouth) 1a of the cylindrical body having a bag length L may be widened to fill the contents.
Further, after the contents are stored in the paper bag 1, the inner bag 12g is sealed when heat sealing is performed along the direction orthogonal to the conveying direction A with respect to the edge 2a facing the other opening, and the second sealing is further performed. When the paper covers the other opening and is attached to the paper layer 5 of the other cylindrical body 15 of the front part or the rear part, the other opening is sealed, thereby preventing the barrier property from being impaired. The contents can be stored in the paper bag 1.
In addition, what is necessary is just to open from the trunk | drum 1e etc. of the paper bag 1 with scissors etc. in order to open the paper bag 1 which accommodated the content and sealed the opening part, and to take out the content.

以上で説明したように、最内層であるアルミ箔又は蒸着フィルムを含む筒体１２のバリア層２と、該筒体１２のバリア層２を覆うように筒体１４のバリア層４に重ね合わされる各筒体１４、１５の紙層４、５を具えた紙袋において、筒体１２のバリア層２は、筒体１２にされる際にバリア層２の袋幅方向両端部２ｃ、２ｄがヒートシールされ、ヒートシールされた袋幅方向両端部２ｃ、２ｄよりも袋幅方向中央側で、各筒体１４、１５にされる紙層４、５とともに折り曲げられる。
そのため、この紙袋１では、従来の、最内層が開いた状態から筒体１２のバリア層２が形成される従来の紙袋（図６）に比べて、筒体１２のバリア層２が形成されるまでの間に埃や紙の粉等の異物４５（図７（ｃ））が最内層のバリア層２に付着しにくく、そのため最終的に出来上がった紙袋１内に、異物４５が入ってしまうことは可及的に防止される。 As described above, the barrier layer 2 of the cylindrical body 12 including the innermost aluminum foil or the vapor deposition film is overlaid on the barrier layer 4 of the cylindrical body 14 so as to cover the barrier layer 2 of the cylindrical body 12. In the paper bag having the paper layers 4 and 5 of the cylinders 14 and 15, the barrier layer 2 of the cylinder 12 is heat-sealed at both ends 2c and 2d in the bag width direction of the barrier layer 2 when the cylinder 12 is formed. Then, it is folded together with the paper layers 4 and 5 that are made into the respective cylinders 14 and 15 on the center side in the bag width direction with respect to the bag width direction both ends 2c and 2d that are heat-sealed.
Therefore, in this paper bag 1, the barrier layer 2 of the cylinder 12 is formed as compared with the conventional paper bag (FIG. 6) in which the barrier layer 2 of the cylinder 12 is formed from the state in which the innermost layer is opened. In the meantime, the foreign matter 45 (FIG. 7C) such as dust and paper powder is difficult to adhere to the innermost barrier layer 2, so that the foreign matter 45 will finally enter the finished paper bag 1. Is prevented as much as possible.

また、この紙袋１では、筒体１２のバリア層２は、筒体１２にされる際にバリア層２の袋幅方向両端部２ｃ、２ｄがヒートシールされ、ヒートシールされた袋幅方向両端部２ｃ、２ｄよりも袋幅方向中央側で、各筒体１４、１５にされる紙層４、５とともに折り曲げられる。
そのため、この紙袋１では、筒体１２のバリア層２間には最内層同士の糊として機能する溶融樹脂１１は介在されず、筒体１２のバリア層２に、溶融樹脂１１を具えた胴貼り部１０（図８（ｂ））が設けられることはない。
したがって、従来の紙袋５１のように、胴貼り部１０を形成する場合に生じていた、バリア層２同士の糊として機能する溶融樹脂１１の量（糊量）の増減に関するトラブルを可及的に防止できる。
たとえば、本考案の紙袋１では溶融樹脂１１の糊量が少なくて破袋が発生するトラブルを可及的に防止できる。
また、本考案の紙袋１では、溶融樹脂１１の糊量が多くて、溶融樹脂１１が胴貼り部１０からはみ出し、他の最内層であるバリア層２同士の間に進入して該バリア層２同士が互いに貼りついてしまい、そのため、紙袋５１の他方の開口（口部）を開口させることができずに内容物の収容ができなくなるという従来の紙袋５１（図６乃至図８）のトラブルを可及的に防止できる。 Moreover, in this paper bag 1, when the barrier layer 2 of the cylinder 12 is made into the cylinder 12, both ends 2c and 2d in the bag width direction of the barrier layer 2 are heat-sealed, and both ends in the bag width direction are heat-sealed. It is bent together with the paper layers 4 and 5 that are made into the cylinders 14 and 15 on the center side in the bag width direction than 2c and 2d.
Therefore, in this paper bag 1, the molten resin 11 that functions as the glue between the innermost layers is not interposed between the barrier layers 2 of the cylindrical body 12, and the body layer that includes the molten resin 11 is attached to the barrier layer 2 of the cylindrical body 12. The part 10 (FIG. 8B) is not provided.
Therefore, as in the case of the conventional paper bag 51, the trouble related to the increase / decrease in the amount of the molten resin 11 (glue amount) that functions as the glue between the barrier layers 2 has occurred as much as possible. Can be prevented.
For example, in the paper bag 1 of the present invention, it is possible to prevent as much as possible the trouble that the amount of glue of the molten resin 11 is small and bag breakage occurs.
Further, in the paper bag 1 of the present invention, the amount of the glue of the molten resin 11 is large, the molten resin 11 protrudes from the body pasting portion 10 and enters between the other innermost barrier layers 2 to form the barrier layer 2. As a result, the other paper bag 51 cannot open the other opening (mouth) of the paper bag 51, and the contents cannot be accommodated, so that the trouble of the conventional paper bag 51 (FIGS. 6 to 8) is possible. It can be prevented as much as possible.

また、本考案の紙袋１では、溶融樹脂１１の量の増減に関するトラブルだけでなく、その他の従来の紙袋５１で生じていた溶融樹脂１１を具えた胴貼り部１０の形成によるトラブルも可及的に防止できる。
たとえば、本考案の紙袋１では、溶融樹脂１１を具えた胴貼り部１０が設けられることはないので、従来の紙袋５１のように、胴貼り部１０の形成によって筒体１２のバリア層２を形成する際に、溶融樹脂１１を溶融する熱によって、溶融樹脂１１と直接接しないバリア層２同士が互いに貼りついてしまい他方の開口（口部）を開口させることができずに内容物の収容ができなくなるというトラブルを、可及的に防止できる。
また、本考案の紙袋１では、上述のように、筒体１２のバリア層２に、溶融樹脂１１を具えた胴貼り部１０（図７（ｂ））が設けられることはない。
そのため、従来のように冷却・固化した溶融樹脂１１によって、胴貼り部１０と胴貼り部１０でない部分との間に段差が生じることはない。
したがって、この紙袋１では、ヒートシールによって、内袋１２ｇの底部３１の形成又は内袋１２ｇの封緘を行う場合に、バリア層２同士の熱融着が困難となり、また確実に行われない箇所が生じるというトラブルを可及的に防止できる。 Further, in the paper bag 1 of the present invention, not only the trouble related to the increase / decrease in the amount of the molten resin 11 but also the trouble caused by the formation of the body pasting portion 10 including the molten resin 11 that occurs in other conventional paper bags 51 is possible. Can be prevented.
For example, in the paper bag 1 of the present invention, since the cylinder pasting portion 10 including the molten resin 11 is not provided, the barrier layer 2 of the cylinder 12 is formed by forming the cylinder pasting portion 10 as in the conventional paper bag 51. During the formation, the heat that melts the molten resin 11 causes the barrier layers 2 that are not in direct contact with the molten resin 11 to adhere to each other, and the other opening (mouth) cannot be opened, and the contents can be accommodated. The trouble of becoming impossible can be prevented as much as possible.
Further, in the paper bag 1 of the present invention, as described above, the barrel pasting portion 10 (FIG. 7B) including the molten resin 11 is not provided on the barrier layer 2 of the cylindrical body 12.
Therefore, the molten resin 11 that has been cooled and solidified as in the prior art does not cause a step between the body pasting portion 10 and the portion that is not the body pasting portion 10.
Therefore, in this paper bag 1, when forming the bottom part 31 of the inner bag 12g or sealing the inner bag 12g by heat sealing, it becomes difficult to heat-seal the barrier layers 2 with each other, and there is a portion that is not reliably performed. Troubles that occur can be prevented as much as possible.

また、本考案の紙袋１は、筒体１２のバリア層２は、筒体１２にされる際にバリア層２の袋幅方向両端部２ｃ、２ｄがヒートシールされ、ヒートシールされた袋幅方向両端部２ｃ、２ｄよりも袋幅方向中央側で、各筒体１４、１５にされる紙層４、５とともに折り曲げられる。
そのため、この紙袋１は、従来の紙袋５２（図９（ｂ））に比べて、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さと、該筒体１２のバリア層２を覆う筒体１４の紙層４の胴部の内周面の周囲の長さの差が可及的に小さくなる。また、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さと、該筒体１２のバリア層２を覆う筒体１５の紙層５の胴部の内周面の周囲の長さの差が、可及的に小さくなる。
なお、図１には、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さと、該筒体１２のバリア層２を覆う筒体１４の紙層４の胴部の内周面の周囲の長さの差が、可及的に小さくされている様子が図示されており、このことは紙袋の袋幅方向端部１ｃ、１ｄでのバリア層２と紙層４の幅の相違（図９（ｂ）の符号Ｗ参照）が可及的になくなっている様子にも表れている。
また、図１には、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さと、該筒体１２のバリア層２を覆う筒体１５の紙層５の胴部の内周面の周囲の長さの差が、可及的に小さくされている様子も図示されている。 Further, in the paper bag 1 of the present invention, when the barrier layer 2 of the cylindrical body 12 is formed into the cylindrical body 12, both end portions 2c and 2d in the bag width direction of the barrier layer 2 are heat-sealed and heat-sealed in the bag width direction. The sheet is folded together with the paper layers 4 and 5 formed in the cylindrical bodies 14 and 15 on the center side in the bag width direction from both ends 2c and 2d.
Therefore, the paper bag 1 has a peripheral length of the outer peripheral surface of the body 2e of the barrier layer 2 of the cylindrical body 12 and the barrier layer 2 of the cylindrical body 12 as compared with the conventional paper bag 52 (FIG. 9B). The difference in the length of the circumference of the inner peripheral surface of the body portion of the paper layer 4 of the cylindrical body 14 covering the cylindrical body is as small as possible. Further, the length around the outer peripheral surface of the barrel portion 2e of the barrier layer 2 of the cylindrical body 12 and the length around the inner peripheral surface of the barrel portion of the paper layer 5 of the cylindrical body 15 covering the barrier layer 2 of the cylindrical body 12. The difference in height becomes as small as possible.
In FIG. 1, the circumference of the outer peripheral surface of the barrel 2 e of the barrier layer 2 of the cylinder 12 and the inner periphery of the trunk of the paper layer 4 of the cylinder 14 covering the barrier layer 2 of the cylinder 12 are shown. The state in which the difference in the perimeter of the surface is made as small as possible is shown, which is the width of the barrier layer 2 and the paper layer 4 at the bag width direction ends 1c and 1d of the paper bag. The difference (see symbol W in FIG. 9B) also appears as much as possible.
FIG. 1 also shows the circumference of the outer peripheral surface of the barrel portion 2e of the barrier layer 2 of the cylinder 12 and the inner circumference of the barrel of the paper layer 5 of the cylinder 15 covering the barrier layer 2 of the cylinder 12. It is also shown that the difference in the perimeter of the surface is made as small as possible.

このように、本考案の紙袋１は、従来の紙袋５２（図９）に比べて、筒体１２のバリア層２の胴部２ｅの外周面の周囲の長さと、該筒体１２のバリア層２を覆う筒体１４の紙層４の胴部又は該筒体１２のバリア層２を覆う筒体１５の紙層５の胴部の内周面の周囲の長さの差が可及的に小さくなった。そのため、内容物による負荷が、筒体１２のバリア層２だけでなく各紙層１４、１５の筒体４、５にもかかりやすくなった。
したがって、この紙袋１は従来の紙袋５２（図９）に比べ袋強度が強く、従来の紙袋５２（図９）に比べ、ヒートシールされた袋幅方向両端部２ｃ、２ｄからの破袋の発生は可及的に防止される。
そのため、本考案の紙袋１では、袋強度を強くし、ヒートシールされた袋幅方向両端部２ｃ、２ｄから破袋が発生するおそれを可及的に防止するために、従来の紙袋５２のように、通常のバリア層２に比べより強度の高い材質のバリア層２を使用するという方法を採る必要がない。
また、本考案の紙袋１では、従来の紙袋５２のように、より強度の高い材質のバリア層２を使用した際に生じる問題、すなわち紙袋５２（図９）に収容する内容物の種類によって、袋強度が弱く破袋が発生するおそれがあるという問題、及び紙袋の材料コストが高くなり、その結果、紙袋の製造コストが高くなるという問題も生じない。 Thus, the paper bag 1 of the present invention has a peripheral length of the outer peripheral surface of the body portion 2e of the barrier layer 2 of the cylinder 12 and the barrier layer of the cylinder 12 as compared with the conventional paper bag 52 (FIG. 9). Difference in the circumference of the inner peripheral surface of the barrel of the paper layer 4 of the cylinder 14 covering the cylinder 2 or the barrel of the paper layer 5 of the cylinder 15 covering the barrier layer 2 of the cylinder 12 is as much as possible. It has become smaller. Therefore, the load due to the contents is easily applied not only to the barrier layer 2 of the cylinder 12 but also to the cylinders 4 and 5 of the paper layers 14 and 15.
Therefore, this paper bag 1 has a stronger bag strength than the conventional paper bag 52 (FIG. 9), and, compared to the conventional paper bag 52 (FIG. 9), the occurrence of bag breakage from the heat-sealed both ends 2c and 2d in the bag width direction. Is prevented as much as possible.
Therefore, in the paper bag 1 of the present invention, in order to increase the strength of the bag and prevent the possibility of bag breakage from the heat-sealed both ends 2c and 2d in the bag width direction, the conventional paper bag 52 is used. In addition, it is not necessary to adopt a method of using a barrier layer 2 made of a material having higher strength than that of a normal barrier layer 2.
Further, in the paper bag 1 of the present invention, the problem that occurs when the barrier layer 2 made of a material having higher strength is used as in the conventional paper bag 52, that is, depending on the type of contents stored in the paper bag 52 (FIG. 9), There is no problem that the bag strength is weak and breakage may occur, and the material cost of the paper bag is increased, and as a result, the manufacturing cost of the paper bag is not increased.

以上で説明したように、本考案の紙袋１によれば、最内層がバリア層２を含む紙袋１であって、異物４５が紙袋１内に入ること及び溶融樹脂１１を具えた胴貼り部１０の形成によるトラブルを可及的に防止できるとともに破袋の発生が可及的に防止できる。 As described above, according to the paper bag 1 of the present invention, the innermost layer is the paper bag 1 including the barrier layer 2, and the foreign matter 45 enters the paper bag 1 and the cylinder pasting portion 10 including the molten resin 11. Troubles due to the formation of the bag can be prevented as much as possible, and the occurrence of broken bags can be prevented as much as possible.

また、本考案の紙袋１は、従来の紙袋５２と比べ、袋強度が強くなって、ヒートシールされた袋幅方向の各端部２ｃ、２ｄからの破袋の発生が可及的に防止されることが、図５で示す試験結果から判明した。
図５は、図１の紙袋の強度を測定する落袋試験の結果を、従来の紙袋のものと比較して示す表である。
この図５では、比較例である従来の紙袋と、本考案に係る実施例の紙袋の落袋試験の結果を並べて示している。図５のNo．１〜No．３は、各紙袋につき試験を３回行った結果を順次表したものである。 Further, the paper bag 1 of the present invention has a stronger bag strength than the conventional paper bag 52, and the occurrence of broken bags from the heat-sealed end portions 2c and 2d in the bag width direction is prevented as much as possible. From the test results shown in FIG.
FIG. 5 is a table showing the results of a bag drop test for measuring the strength of the paper bag of FIG. 1 in comparison with that of a conventional paper bag.
In FIG. 5, the results of a drop test of a conventional paper bag as a comparative example and the paper bag of the example according to the present invention are shown side by side. No. in FIG. 1-No. 3 represents the results of three tests for each paper bag.

・試験方法
比較例である従来の紙袋５２（図９（ａ）及び図９（ｂ））と、本考案の実施例の紙袋１について、内袋１２ｇの底部３１及び紙袋の底部４０を形成した後、内容物を収容し、その後に内袋１２ｇの封緘及び紙袋の他方の開口（口部）を封緘したものを用意した。
そして、これら各紙袋の正面を上に向け、高さ１．２ｍの落下高さからこの紙袋を５回落下させた後、紙袋の背面を上に向け紙袋を５回落下させた。
このような各落下の後、各紙袋での内容物の漏れ又は破袋の発生を目視にて確認した。
この計１０回の落下を行った結果、紙袋に内容物の漏れ又は破袋の発生が無い場合には、その紙袋につき合格として記録した。
また、計１０回の落下までに紙袋に内容物の漏れ又は破袋の発生が生じた場合は、内容物の漏れ又は破袋の発生が生じた時点まで紙袋を落下させた回数と、その内容物の漏れの原因となった紙袋の破損箇所又は破袋の発生箇所を記録した。 Test Method For the conventional paper bag 52 (FIGS. 9A and 9B) as a comparative example and the paper bag 1 of the embodiment of the present invention, the bottom 31 of the inner bag 12g and the bottom 40 of the paper bag were formed. Thereafter, the contents were accommodated, and then the inner bag 12g was sealed and the other opening (mouth) of the paper bag was sealed.
Then, the paper bag was dropped five times from the drop height of 1.2 m, and then the paper bag was dropped five times with the back of the paper bag facing up.
After each such drop, the leakage of contents in each paper bag or the occurrence of broken bags was visually confirmed.
As a result of this total of 10 drops, if there was no leakage or breakage of the contents in the paper bag, the paper bag was recorded as acceptable.
In addition, if the contents are leaked or broken in the paper bag by 10 times in total, the number of times the paper bag was dropped until the time when the contents were leaked or broken, and the contents The location where the paper bag was damaged or the bag was broken was recorded.

この試験における、比較例の紙袋５２および本願の実施例の紙袋１についての共通の試験条件は以下のとおりであった。
・紙袋の材料構成：以下の３層（いわゆる３Ｐ）の紙袋とした。
（１）バリア層２
バリア層２は、層厚１２０μｍの高圧法低密度ポリエチレン（略号：ＬＤＰＥ）と、層厚１２μｍのアルミ蒸着されたポリエチレンテレフタレート（略号：蒸着ＡＬＰＥＴ）とを貼り合わせてなる層から構成されるものとした。
（２）紙層４、５
各紙層４、５はいずれも、単位面積当たりの質量８４g／ｍ^２のクラフト紙（略号：Ｋ）からなる紙層から構成されているものとした。
・紙袋の内容物
紙袋に収容する内容物はアクリル樹脂であることとした。 In this test, common test conditions for the paper bag 52 of the comparative example and the paper bag 1 of the example of the present application were as follows.
-Material configuration of paper bag: The following three layers (so-called 3P) paper bag.
(1) Barrier layer 2
The barrier layer 2 is composed of a layer formed by laminating a high-pressure low-density polyethylene (abbreviation: LDPE) having a layer thickness of 120 μm and polyethylene terephthalate (abbreviation: vapor-depositing ALPET) having a layer thickness of 12 μm deposited on aluminum. did.
(2) Paper layers 4, 5
Each of the paper layers 4 and 5 was composed of a paper layer made of kraft paper (abbreviation: K) having a mass of 84 g / m ² per unit area.
・ Contents in the paper bag The contents in the paper bag were made of acrylic resin.

また、比較例の紙袋５２および本願の実施例の紙袋１についての、その他の試験条件は以下のとおりとした。
〔比較例〕
紙袋の寸法：仕上がり寸法（すなわち、一袋の袋長さＬ）８２５ｍｍ×胴幅（すなわち胴部１ｅの袋幅方向両端部の縁間の長さ）５１０ｍｍであることとした。
筒体のバリア層の折り曲げ：この折り曲げが無いものとした（図９（ａ）及び図９（ｂ）参照）。
紙袋の内容物：内容物は、アクリル樹脂２５ｋｇであることとした。
〔本考案の実施例〕
紙袋の寸法：仕上がり寸法（すなわち、一袋の袋長さＬ）８２５ｍｍ×胴幅（すなわち胴部１ｅの袋幅方向両端部の縁間の長さ）４７５ｍｍであることとした。
筒体のバリア層の折り曲げ：この折り曲げが有るものとした（図１（ａ）及び図１（ｂ）、図４参照）。
紙袋の内容物：内容物は、アクリル樹脂２４ｋｇであることとした。

上述した比較例の紙袋５２および実施例の紙袋１の各条件のうち、「筒体のバリア層の折り曲げ」とは、上述のように筒体１２のバリア層２の、ヒートシールされた袋幅方向両端部２ｃ、２ｄよりも袋幅方向中央側で折り曲げる折り曲げのことであり、この折り曲げは上述のように、搬送方向Ａと平行な方向に沿って行われた。また、この折り曲げは、図２（ａ）の符号Ｘで示すように、筒体１２のバリア層２の袋幅方向両端部２ｃ、２ｄの縁から１５ｍｍに位置する袋幅方向中央よりで行われた。 The other test conditions for the paper bag 52 of the comparative example and the paper bag 1 of the example of the present application were as follows.
[Comparative example]
Size of paper bag: Finished size (namely, bag length L of one bag) 825 mm × body width (namely, the length between the edges of both ends of the body portion 1 e in the bag width direction) 510 mm.
Bending of the barrier layer of the cylindrical body: This bending was not performed (see FIGS. 9A and 9B).
Paper bag contents: The contents were 25 kg of acrylic resin.
[Embodiments of the present invention]
The size of the paper bag: the finished size (that is, the bag length L of one bag) 825 mm × the body width (that is, the length between the edges of both ends in the bag width direction of the body 1 e) 475 mm.
Bending of the barrier layer of the cylindrical body: It was assumed that there was this bending (see FIGS. 1A, 1B, and 4).
Paper bag contents: The contents were 24 kg of acrylic resin.

Among the conditions of the paper bag 52 of the comparative example and the paper bag 1 of the example described above, “folding of the barrier layer of the cylindrical body” is the heat-sealed bag width of the barrier layer 2 of the cylindrical body 12 as described above. Folding is performed at the center in the bag width direction from both ends 2c and 2d in the direction, and this folding was performed along a direction parallel to the conveying direction A as described above. Further, as shown by the symbol X in FIG. 2A, this folding is performed from the center in the bag width direction located 15 mm from the edges of the bag width direction both ends 2c and 2d of the barrier layer 2 of the cylindrical body 12. It was.

図５の比較例で示すように、従来の紙袋５２では、バリア層２を、層厚１２０μｍの高圧法低密度ポリエチレン（略号：ＬＤＰＥ）と、層厚１２μｍのアルミ蒸着されたポリエチレンテレフタレート（略号：蒸着ＡＬＰＥＴ）とを貼り合わせてなる層から構成した場合には、破袋の発生が生じた。そのため、結局、従来、この構成のバリア層２を使用できなかった。
しかし、図５の実施例で示すように、本考案の実施例の紙袋１では、バリア層を層厚１２０μｍの高圧法低密度ポリエチレン（略号：ＬＤＰＥ）と、層厚１２μｍのアルミ蒸着されたポリエチレンテレフタレート（略号：蒸着ＡＬＰＥＴ）とを貼り合わせてなる層から構成しても、袋強度を強く、ヒートシールされた袋幅方向両端部２ｃ、２ｄからの破袋の発生を可及的に防止できた。
そのため、この本考案の実施例の紙袋１では、袋強度を強くして、ヒートシールされた袋幅方向両端部２ｃ、２ｄから破袋が発生するおそれを可及的に防止するために、上記構成のバリア層２に比べより強度の高い材質のバリア層を使用するという方法を採る必要がなくなった。
また、この実施例の紙袋１では、従来の紙袋５２のように、より強度の高い材質のバリア層２を使用した際に生じる問題、すなわち紙袋５２（図９（ａ）及び図９（ｂ））に収容する内容物の種類によって、袋強度が弱く破袋が発生するおそれがあるという問題、及び紙袋１の材料コストが高くなり、その結果、紙袋１の製造コストが高くなるという問題も生じなくなった。 As shown in the comparative example of FIG. 5, in the conventional paper bag 52, the barrier layer 2 is composed of a high-pressure low-density polyethylene (abbreviation: LDPE) having a layer thickness of 120 μm and an aluminum-deposited polyethylene terephthalate (abbreviation: 12 μm). In the case where it is composed of a layer formed by laminating the vapor-deposited ALPET), bag breakage occurred. Therefore, after all, the barrier layer 2 having this configuration cannot be used conventionally.
However, as shown in the embodiment of FIG. 5, in the paper bag 1 of the embodiment of the present invention, the barrier layer is a high-pressure low-density polyethylene (abbreviation: LDPE) having a layer thickness of 120 μm and an aluminum-deposited polyethylene having a layer thickness of 12 μm. Even if it consists of a layer formed by bonding terephthalate (abbreviation: vapor-deposited ALPET), the bag strength is strong and the occurrence of bag breakage from the heat-sealed both ends 2c and 2d in the bag width direction can be prevented as much as possible. It was.
Therefore, in the paper bag 1 of the embodiment of the present invention, in order to prevent the possibility that the bag breaks from the heat sealed bag width direction both ends 2c and 2d as much as possible, the bag strength is increased. It is no longer necessary to use a barrier layer made of a material having higher strength than the barrier layer 2 having the structure.
Further, in the paper bag 1 of this embodiment, the problem caused when the barrier layer 2 made of a material having higher strength is used as in the conventional paper bag 52, that is, the paper bag 52 (FIGS. 9A and 9B). ) Depending on the type of contents contained in the bag, there is a possibility that the bag strength is weak and breakage may occur, and the material cost of the paper bag 1 is increased, and as a result, the manufacturing cost of the paper bag 1 is increased. lost.

このように、本考案の実施例の紙袋１では、従来の紙袋５２（図９（ａ）及び図９（ｂ））に比べて、袋強度が強く、破袋の発生が可及的に防止できた。
また、本考案の実施例の紙袋１では、上述のように、より強度の高い材質のバリア層２を使用した際に生じる従来の問題も生じなくなった。
また、この考案の実施例の紙袋１では、異物４５が紙袋１内に入ること及び溶融樹脂１１を具えた胴貼り部１０の形成によるトラブルを可及的に防止できたことはもちろんである。 Thus, in the paper bag 1 of the embodiment of the present invention, compared with the conventional paper bag 52 (FIGS. 9A and 9B), the bag strength is stronger and the occurrence of broken bags is prevented as much as possible. did it.
Further, in the paper bag 1 of the embodiment of the present invention, as described above, the conventional problem that occurs when the barrier layer 2 made of a material having higher strength is used does not occur.
Further, in the paper bag 1 according to the embodiment of the present invention, it is of course possible to prevent as much as possible the trouble caused by the foreign matter 45 entering the paper bag 1 and the formation of the body pasting portion 10 including the molten resin 11.

上記実施例の紙袋１では、２層の紙層４、５を具えるものとして本考案の紙袋を説明したが、本考案の紙袋１の紙層４、５の層数はこれに限定されず、紙袋５１は少なくとも１層の紙層を備えていればよい。また、この紙袋１の最内層は、バリア層２であればよい。 In the paper bag 1 of the above embodiment, the paper bag of the present invention has been described as having two paper layers 4, 5, but the number of paper layers 4, 5 of the paper bag 1 of the present invention is not limited to this. The paper bag 51 only needs to have at least one paper layer. Further, the innermost layer of the paper bag 1 may be the barrier layer 2.

上記実施例の紙袋１では、一袋の袋長さＬの筒状体の両端の開口の封緘を、第１の封緘紙４１と第２の封緘紙によって行ったが、これら封緘紙による封緘方法は従前の技術である。
また、上記実施例の紙袋１では、一袋の袋長さＬの筒状体の両端の開口の封緘を、第１の封緘紙４１と第２の封緘紙によって行ったが、この考案の紙袋１では、これら各開口の封緘方法は、封緘紙によるものに限定されないことはもちろんである。 In the paper bag 1 of the above embodiment, the opening at both ends of the cylindrical body having a bag length L of one bag is sealed with the first sealing paper 41 and the second sealing paper. Is a conventional technique.
In the paper bag 1 of the above embodiment, the opening at both ends of the cylindrical body having a bag length L is sealed with the first sealing paper 41 and the second sealing paper. In No. 1, the sealing method for each opening is not limited to that using sealing paper.

異物が紙袋内に入らず、最内層がバリア層を含む紙袋であって、異物が紙袋内に入ること及び溶融樹脂を具えた胴貼り部の形成によるトラブルを可及的に防止でき、バリア層からなる内袋の底部の形成又は口部の封緘を可及的に容易でかつ確実に行うことができるとともに破袋の発生が可及的に防止できる紙袋として、最内層がインフレーション法で製造できないバリア層で構成された紙袋に適用できる。 A barrier layer that prevents foreign matter from entering the paper bag and the innermost layer is a paper bag including a barrier layer, and prevents foreign matter from entering the paper bag and the formation of a body pasting portion including a molten resin. The innermost layer cannot be manufactured by the inflation method as a paper bag that can form the bottom of the inner bag or seal the mouth as easily and reliably as possible and prevent the occurrence of broken bags as much as possible. It can be applied to a paper bag composed of a barrier layer.

１…紙袋
２…バリア層、筒体のバリア層
４、５…紙層、筒体の紙層
１２、１４、１５…筒体
２ｃ、２ｄ…袋幅方向両端部
Ｙ…袋幅方向両端部よりも袋幅方向中央側で折り曲げられる折り曲げ線 DESCRIPTION OF SYMBOLS 1 ... Paper bag 2 ... Barrier layer, cylindrical barrier layer 4, 5 ... Paper layer, cylindrical paper layer 12, 14, 15 ... Cylindrical body 2c, 2d ... Both ends of bag width direction Y ... From both ends of bag width direction Folding line that can be folded at the center in the bag width direction

Claims

In a paper bag comprising a cylindrical barrier layer including an aluminum foil or vapor-deposited film that is the innermost layer, and a cylindrical paper layer superimposed on the cylindrical barrier layer so as to cover the barrier layer of the cylindrical body,
The barrier layer of the cylindrical body is heat sealed at both ends in the bag width direction of the barrier layer when being formed into the cylindrical body, and the cylinder is closer to the center in the bag width direction than the both ends of the bag width direction that are heat sealed. A paper bag which is folded together with a paper layer to be made into a body.