JP3204670U

JP3204670U - Heavy wrapping paper bag

Info

Publication number: JP3204670U
Application number: JP2016001427U
Authority: JP
Inventors: 知之福田; 誠二景山; 啓介氣谷
Original assignee: Oji Holdings Corp; Oji Paper Co Ltd
Current assignee: New Oji Paper Co Ltd; Oji Holdings Corp
Priority date: 2016-03-29
Filing date: 2016-03-29
Publication date: 2016-06-09
Anticipated expiration: 2026-03-29

Abstract

【課題】坪量を８１ｇ／ｍ２以下のクラフト紙を用いても、十分な強度で、折り畳みが容易な二層構造の重包装紙袋を提供する。【解決手段】一端側の封かん部１１と他端側の充填口１２とを有する重包装紙袋であって、この重包装紙袋は、内側クラフト紙と外側クラフト紙１３の二層構造になっており、前記内側クラフト紙および前記外側クラフト紙は、坪量が８１ｇ／ｍ２以下、且つ袋の縦方向の引張破断伸び（ＪＩＳＰ８１１３）が９．５％以下であり、前記外側クラフト紙、前記内側クラフト紙の両方が、袋の縦方向の引張強さ（ＪＩＳＰ８１１３）と袋の横方向の引張破断伸び（ＪＩＳＰ８１１３）の積が２５以上であることを特徴とする重包装紙袋である。【選択図】図１To provide a double wrapping paper bag having a sufficient strength and easy to fold even when kraft paper having a basis weight of 81 g / m 2 or less is used. A heavy wrapping paper bag having a sealing portion 11 on one end side and a filling port 12 on the other end side, wherein the heavy wrapping paper bag has a two-layer structure of an inner kraft paper and an outer kraft paper 13. The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m 2 or less and a longitudinal tensile breaking elongation (JIS P 8113) of 9.5% or less. Both kraft papers are heavy wrapping paper bags characterized in that the product of the tensile strength in the longitudinal direction of the bag (JIS P 8113) and the tensile breaking elongation in the lateral direction of the bag (JIS P 8113) is 25 or more. . [Selection] Figure 1

Description

本考案は、粉粒体などを収容するための重包装紙袋に関する。 The present invention relates to a heavy wrapping paper bag for accommodating powder particles and the like.

重包装紙袋は、米や麦など穀物類やジャガイモ、ニンジンといった農産物、或いは肥料、化学薬品、セメント、石膏などの工業用粉類、更には廃棄物など、幅広い用途に用いられている。紙製の包装袋としては、クラフト紙が用いられているが、例えば、３０ｋｇを超えるような内包物を充填する重包装紙袋の場合、クラフト紙を三層以上重ねて使用されている。しかし、三層以上に積層された重包装紙袋は、使用前は小さく折り畳んで保管することが困難である。また使用後は廃棄物となることから、二層に積層された重包装紙袋で、３０ｋｇを超えるような内装物を充填した場合でも耐えうるような重包装紙袋が望まれている。 Heavy wrapping paper bags are used in a wide range of applications such as grains such as rice and wheat, agricultural products such as potatoes and carrots, industrial powders such as fertilizers, chemicals, cement and gypsum, and wastes. Kraft paper is used as the paper packaging bag. For example, in the case of a heavy packaging paper bag filled with inclusions exceeding 30 kg, three or more layers of kraft paper are used. However, it is difficult to fold and store a heavy wrapping paper bag laminated in three or more layers before use. Moreover, since it becomes a waste after use, the heavy wrapping paper bag which can be endured even if it fills up the interior which exceeds 30 kg with the heavy wrapping paper bag laminated | stacked on two layers is desired.

特開２００７−９１３２６号公報JP 2007-91326 A 実用新案登録３１８９８６５号公報Utility Model Registration No. 3189865

特許文献１には、クラフト伸張紙を用いることで、強度の高い二層構造の包装紙袋を提案しているが、引張り破断伸びが１０％以上という特殊なクラフト紙であり、高価なものである。特許文献２には、クラフト紙の間に補強用のシートを備える重包装紙袋を提案しているが、構造が複雑であるから、製造が困難であり、また、高価な重包装紙袋となる。
本考案者等は、クラフト紙を用いた二層構造の重包装紙袋について、鋭意研究を行った。坪量が８１ｇ／ｍ^２を超えるようなクラフト紙を用いると強度は高くなるが、折り畳み難くなる。
坪量が８１ｇ／ｍ^２以下のクラフト紙を用いると、強度が弱く、使用の際に袋が裂けてしまい、内容物が出てしまう場合もあった。本考案者等は、坪量を８１ｇ／ｍ^２以下のクラフト紙を用い、十分な強度で、折り畳みが容易な二層構造の重包装紙袋を提供すべく、更に研究を重ねた結果、特定の条件を満足するクラフト紙を採用することにより達成できることを見出したのである。 Patent Document 1 proposes a wrapping paper bag having a high-strength two-layer structure by using kraft stretch paper, but is special kraft paper with a tensile elongation at break of 10% or more, and is expensive. . Patent Document 2 proposes a heavy wrapping paper bag including a reinforcing sheet between kraft papers. However, since the structure is complicated, it is difficult to manufacture and becomes an expensive heavy wrapping paper bag.
The present inventors conducted intensive research on a double-layered heavy-duty wrapping paper bag using kraft paper. When kraft paper having a basis weight exceeding 81 g / m ² is used, the strength increases, but it becomes difficult to fold.
When kraft paper having a basis weight of 81 g / m ² or less was used, the strength was weak, the bag was torn during use, and the contents sometimes appeared. As a result of further research, the inventors of the present invention have used a kraft paper having a basis weight of 81 g / m ² or less to provide a double wrapping paper bag having sufficient strength and easy to fold. It was found that this can be achieved by adopting kraft paper that satisfies the conditions.

本考案のクラフト紙を用いた二層構造の重包装紙袋は、次のとおりである。
（１）一端側の封かん部と他端側の充填口とを有する重包装紙袋であって、
この重包装紙袋は、内側クラフト紙と外側クラフト紙の二層構造になっており、
前記内側クラフト紙および前記外側クラフト紙は、坪量が８１ｇ／ｍ^２以下、且つ袋の縦方向の引張破断伸び（ＪＩＳＰ８１１３）が９．５％以下であり、
前記外側クラフト紙の、袋の縦方向の引張強さ（ＪＩＳＰ８１１３）と袋の横方向の引張破断伸び（ＪＩＳＰ８１１３）の積が２５以上であることを特徴とする重包装紙袋。 The double wrapping paper bag using kraft paper of the present invention is as follows.
(1) A heavy wrapping paper bag having a sealing part on one end side and a filling port on the other end side,
This heavy wrapping paper bag has a two-layer structure of inner kraft paper and outer kraft paper,
The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m ² or less, and a longitudinal tensile breaking elongation (JIS P 8113) of the bag is 9.5% or less,
A heavy wrapping paper bag, wherein the outer kraft paper has a product of a tensile strength (JIS P 8113) in the longitudinal direction of the bag and a tensile elongation at break (JIS P 8113) in the lateral direction of the bag of 25 or more.

（２）一端側の封かん部と他端側の充填口とを有する重包装紙袋であって、
この重包装紙袋は、内側クラフト紙と外側クラフト紙の二層構造になっており、
前記内側クラフト紙および前記外側クラフト紙は、坪量が８１ｇ／ｍ^２以下、且つ袋の縦方向の引張破断伸び（ＪＩＳＰ８１１３）が９．５％以下であり、
前記内側クラフト紙の、袋の縦方向の引張強さ（ＪＩＳＰ８１１３）と袋の横方向の引張破断伸び（ＪＩＳＰ８１１３）の積が２５以上であることを特徴とする重包装紙袋。 (2) A heavy wrapping paper bag having a sealing part on one end side and a filling port on the other end side,
This heavy wrapping paper bag has a two-layer structure of inner kraft paper and outer kraft paper,
The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m ² or less, and a longitudinal tensile breaking elongation (JIS P 8113) of the bag is 9.5% or less,
A heavy wrapping paper bag, wherein the inner kraft paper has a product of a tensile strength in the longitudinal direction of the bag (JIS P 8113) and a tensile elongation at break (JIS P 8113) in the lateral direction of the bag of 25 or more.

（３）一端側の封かん部と他端側の充填口とを有する重包装紙袋であって、
この重包装紙袋は、内側クラフト紙と外側クラフト紙の二層構造になっており、
前記内側クラフト紙および前記外側クラフト紙は、坪量が８１ｇ／ｍ^２以下、且つ袋の縦方向の引張破断伸び（ＪＩＳＰ８１１３）が９．５％以下であり、
前記外側クラフト紙、前記内側クラフト紙の両方が、袋の縦方向の引張強さ（ＪＩＳＰ８１１３）と袋の横方向の引張破断伸び（ＪＩＳＰ８１１３）の積が２５以上であることを特徴とする重包装紙袋。 (3) A heavy wrapping paper bag having a sealing part on one end side and a filling port on the other end side,
This heavy wrapping paper bag has a two-layer structure of inner kraft paper and outer kraft paper,
The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m ² or less, and a longitudinal tensile breaking elongation (JIS P 8113) of the bag is 9.5% or less,
Both the outer kraft paper and the inner kraft paper have a product of 25 or more in the product of the tensile strength in the longitudinal direction of the bag (JIS P 8113) and the tensile elongation at break in the lateral direction of the bag (JIS P 8113). And heavy wrapping paper bag.

（４）前記外側クラフト紙の、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が３５以上である（１）〜（３）の何れかに記載の重包装紙袋。
（５）前記外側クラフト紙の、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が４５以上である（１）〜（４）の何れかに記載の重包装紙袋。 (4) The heavy wrapping paper bag according to any one of (1) to (3), wherein the product of the tensile strength in the longitudinal direction of the bag and the tensile breaking elongation in the lateral direction of the bag is 35 or more.
(5) The heavy wrapping paper bag according to any one of (1) to (4), wherein the outer kraft paper has a product of a tensile strength in the longitudinal direction of the bag and a tensile breaking elongation in the lateral direction of the bag of 45 or more.

（６）前記外側クラフト紙の、袋の縦方向の引張強さが５ｋＮ／ｍ以上である（１）〜（５）の何れかに記載の重包装紙袋。
（７）前記外側クラフト紙の、袋の縦方向の引張強さが５．５ｋＮ／ｍ以上である（１）〜（６）の何れかに記載の重包装紙袋。 (6) The heavy wrapping paper bag according to any one of (1) to (5), wherein the outer kraft paper has a tensile strength in the longitudinal direction of the bag of 5 kN / m or more.
(7) The heavy wrapping paper bag according to any one of (1) to (6), wherein the outer kraft paper has a tensile strength in the longitudinal direction of the bag of 5.5 kN / m or more.

（８）前記外側クラフト紙の、袋の横方向の引張破断伸びが５．０％以上である（１）〜（７）の何れかに記載の重包装紙袋。
（９）前記外側クラフト紙の、袋の横方向の引張破断伸びが５．５％以上である（１）〜（８）の何れかに記載の重包装紙袋。 (8) The heavy wrapping paper bag according to any one of (1) to (7), wherein the outer kraft paper has a tensile elongation at break in the lateral direction of the bag of 5.0% or more.
(9) The heavy wrapping paper bag according to any one of (1) to (8), wherein the outer kraft paper has a tensile elongation at break in the lateral direction of the bag of 5.5% or more.

（１０) 前記外側クラフト紙の、袋の縦方向の引張破断伸びが５％以下である（１）〜（９）の何れかに記載の重包装紙袋。 (10) The heavy wrapping paper bag according to any one of (1) to (9), wherein the outer kraft paper has a tensile elongation at break in the longitudinal direction of the bag of 5% or less.

（１１）前記外側クラフト紙および前記内側クラフト紙の、坪量が８１ｇ／ｍ^２以下である（１）〜（１０）の何れかに記載の重包装紙袋。
（１２）前記外側クラフト紙および内側クラフト紙の、坪量が７８ｇ／ｍ^２以下である（１）〜（１１）の何れかに記載の重包装紙袋。 (11) The heavy wrapping paper bag according to any one of (1) to (10), wherein the basis weight of the outer kraft paper and the inner kraft paper is 81 g / m ² or less.
(12) The heavy wrapping paper bag according to any one of (1) to (11), wherein the basis weight of the outer kraft paper and the inner kraft paper is 78 g / m ² or less.

（１３）前記外側クラフト紙および前記内側クラフト紙が、未晒クラフト紙で（１）〜（１２）の何れかに記載の重包装紙袋。 (13) The heavy wrapping paper bag according to any one of (1) to (12), wherein the outer kraft paper and the inner kraft paper are unbleached kraft paper.

（１４）前記重包装紙袋の長さが７５０ｍｍ以上、１０００ｍｍ以下であり、胴幅が４００ｍｍ以上６００ｍｍ以下である（１）〜（１３）の何れかに記載の重包装紙袋。 (14) The heavy wrapping paper bag according to any one of (1) to (13), wherein the length of the heavy wrapping paper bag is not less than 750 mm and not more than 1000 mm, and the trunk width is not less than 400 mm and not more than 600 mm.

（１５）重包装紙袋が、紙バンド付片底ばり構造である（１）〜（１４）の何れかに記載の重包装紙袋。 (15) The heavy wrapping paper bag according to any one of (1) to (14), wherein the heavy wrapping paper bag has a single-bottom beam structure with a paper band.

（１６）穀物類を内包するための重包装紙袋である（１）〜（１５）の何れかに記載の重包装紙袋。 (16) The heavy wrapping paper bag according to any one of (1) to (15), which is a heavy wrapping paper bag for enclosing grains.

本考案の重包装紙袋によると、坪量が８１ｇ／ｍ^２以下のクラフト紙を用いた二層構造の袋であるにもかかわらず、３０ｋｇの米を充填し、取り扱いをしても裂ける事なく安心して使用することができる。また、使用前は容易に折りたたんで保管することができる。更に、使用後廃棄する場合、三層積層していた袋が二層となるので、おおよそ２／３に廃棄物量が減ることとなる。 According to the heavy wrapping paper bag of the present invention, even though it is a two-layer bag using kraft paper with a basis weight of 81 g / m ² or less, it is filled with 30 kg of rice without tearing even if handled. Can be used with confidence. Moreover, it can be easily folded and stored before use. Further, when discarded after use, since the three-layered bag becomes two layers, the amount of waste is reduced to about 2/3.

本考案による重包装紙袋を米袋に応用した一実施形態の使用状態における外観を表す立体投影図である。It is a three-dimensional projection figure showing the external appearance in the use condition of one Embodiment which applied the heavy wrapping paper bag by this invention to the rice bag. 図１に示した米袋の外観を充填口側から見た立体投影図である。It is the three-dimensional projection figure which looked at the external appearance of the rice bag shown in FIG. 1 from the filling port side. 図１に示した米袋の外観を封かん部側から見た立体投影図である。It is the three-dimensional projection figure which looked at the external appearance of the rice bag shown in FIG. 1 from the sealing part side. 図２中のＩＶ−ＩＶ矢視に沿った断面図である。It is sectional drawing along the IV-IV arrow in FIG. 図３中のＶ−Ｖ矢視に沿った断面図である。It is sectional drawing along the VV arrow in FIG.

本考案による重包装紙袋を３０ｋｇ用の米袋に応用した実施形態について、図１〜図５を参照しながら詳細に説明する。しかしながら、本考案はこのような実施形態のみに限らず、充填物の種類やその使用形態などに応じて充填口や封かん口などを従来から周知の構成へと任意に変更し得るものである。 An embodiment in which a heavy wrapping paper bag according to the present invention is applied to a 30 kg rice bag will be described in detail with reference to FIGS. However, the present invention is not limited to such an embodiment, and the filling port, the sealing port, and the like can be arbitrarily changed to a conventionally known configuration in accordance with the type of the filling material and the usage form thereof.

本実施形態による米袋の使用状態を模式的に表す図１およびこの米袋の外観をそれぞれ表す図２，図３に示すように、本実施形態における米袋１０は、一端側の封かん部１１と他端側の充填口１２とを有するひだなし片底はり構造を採用している。図２中のＩＶ−ＩＶ矢視断面形状を図４に示し、図３中のＶ−Ｖ矢視断面形状を図５に示す。
米袋１０は、内側クラフト紙１４と、外側クラフト紙１３とを具えている。米袋１０の裏面１０Ｒ側には外側クラフト紙１３の貼合部１３ｇと内側クラフト紙１４の貼合部１４ｇとが配されているが、これら２つの貼合部１３ｇ，１４ｇは、相互に重なり合わないように米袋１０の幅方向に沿ってずらして形成されている。 As schematically shown in FIG. 1 showing the use state of the rice bag according to the present embodiment and FIGS. 2 and 3 respectively showing the appearance of the rice bag, the rice bag 10 in the present embodiment has a sealing portion 11 on one end side and the other end. A pleated single-bottom beam structure having a side filling port 12 is employed. 4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a sectional view taken along the line VV in FIG.
The rice bag 10 includes an inner kraft paper 14 and an outer kraft paper 13. Although the bonding part 13g of the outer side kraft paper 13 and the bonding part 14g of the inner side kraft paper 14 are arranged on the back surface 10R side of the rice bag 10, these two bonding parts 13g and 14g overlap each other. The rice bag 10 is formed so as to be shifted along the width direction.

この重包装紙袋は、内側クラフト紙１４と外側クラフト紙１３の二層構造になっている。内側クラフト紙および外側クラフト紙は、坪量が８１ｇ／ｍ^２以下であり、袋の縦方向の引張破断伸び（ＪＩＳＰ８１１３）が９．５％以下であれば特に限定するものではない。好ましい坪量は８１ｇ／ｍ^２以下であり、より好ましい坪量は７８ｇ／ｍ^２以下である。坪量の下限値は特に限定するものではないが、後で述べる袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５以上を満足する必要がある。従って、６９ｇ／ｍ^２以上の坪量とすることが好ましい。 This heavy wrapping paper bag has a two-layer structure of inner kraft paper 14 and outer kraft paper 13. The inner kraft paper and the outer kraft paper are not particularly limited as long as the basis weight is 81 g / m ² or less and the tensile elongation at break (JIS P 8113) of the bag is 9.5% or less. A preferred basis weight is 81 g / m ² or less, and a more preferred basis weight is 78 g / m ² or less. The lower limit value of the basis weight is not particularly limited, but the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag described later needs to satisfy 25 or more. Accordingly, the basis weight is preferably 69 g / m ² or more.

一方、好ましい袋の縦方向の引張破断伸びは５％以下である。袋の縦方向の引張り破断伸びが5％以下とすることにより、コストを低減できるばかりか、袋の剛度が低下し、袋が折れ曲がりやすくなるために充填に支障をきたすことを効率よく防ぐことができる。 On the other hand, the preferred tensile elongation at break in the longitudinal direction of the bag is 5% or less. By making the longitudinal tensile break elongation of the bag 5% or less, not only can the cost be reduced, but also the bag's rigidity can be lowered and the bag can be easily bent so that it can efficiently prevent the filling from being hindered. it can.

クラフト紙の原料パルプとしては、例えば針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹未晒クラフトパルプ（ＮＵＫＰ）、広葉樹未晒クラフトパルプ（ＬＵＫＰ）、針葉樹半晒クラフトパルプ（ＮＳＢＫＰ）、広葉樹半晒クラフトパルプ（ＬＳＢＫＰ）等の化学パルプを用いるが、茶古紙やクラフト封筒古紙から製造される古紙パルプを用いてもよい。更に、ストーングランドパルプ（ＳＧＰ）、加圧ストーングランドパルプ（ＰＧＷ）、リファイナーグランドパルプ（ＲＧＰ）、サーモグランドパルプ（ＴＧＰ）、ケミグランドパルプ（ＣＧＰ）、砕木パルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ）等の機械パルプ、古紙パルプ等の公知の種々のパルプを併用してもよい。中でも、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積の値を高めるためには、ＮＢＫＰやＮＵＫＰ、ＮＳＢＫＰなど、針葉樹クラフトパルプを主成分として用いることが好ましく、特にＮＵＫＰの使用が好ましい。 Examples of kraft paper pulp include softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood unbleached kraft pulp (NUKP), hardwood unbleached kraft pulp (LUKP), and softwood semi-bleached kraft pulp (NSBKP). ), Chemical pulp such as hardwood semi-bleached kraft pulp (LSBKP) is used, but waste paper pulp manufactured from waste tea paper or kraft envelope waste paper may also be used. Further, Stone Grand Pulp (SGP), Pressurized Stone Grand Pulp (PGW), Refiner Grand Pulp (RGP), Thermo Grand Pulp (TGP), Chemi Grand Pulp (CGP), Ground Wood Pulp (GP), Thermo Mechanical Pulp (TMP) ) And other known pulps such as waste paper pulp may be used in combination. Among them, in order to increase the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag, it is preferable to use softwood kraft pulp as a main component, such as NBKP, NUKP, NSBKP, Use is preferred.

内側クラフト紙１４と外側クラフト紙１３は、図示はしないが、全域を接着剤により接合していてもよく、部分的に接着剤により接合していてもよく、また接合されていなくてもよい。しかし、全領域、或いは少なくとも複数の領域で、内側クラフト紙１４と外側クラフト紙１３を接着剤により接合することが、強度の面から優位となり、好ましい。接着剤としては、重包装紙袋の底ばり用に使用される公知の材料を使用することができる。 Although not shown, the inner kraft paper 14 and the outer kraft paper 13 may be joined together by an adhesive, may be partially joined by an adhesive, or may not be joined. However, joining the inner kraft paper 14 and the outer kraft paper 13 with an adhesive in the entire region or at least in a plurality of regions is advantageous in terms of strength, and is preferable. As the adhesive, a known material used for bottoming a heavy wrapping paper bag can be used.

袋の大きさは、２０ｋｇ、３０ｋｇといった重量の米などを内包できるものであれば特に限定するものではないが、前記重包装紙袋の長さが７５０ｍｍ以上、胴幅が４００ｍｍ以上であることが好ましい。上限については特に限定するものではないが、取り扱いの点から、袋の長さは１０００ｍｍ以下であり、胴幅が６００ｍｍ以下であることが好ましい。 The size of the bag is not particularly limited as long as it can contain rice having a weight of 20 kg, 30 kg, etc. The length of the heavy wrapping paper bag is preferably 750 mm or more and the trunk width is 400 mm or more. . The upper limit is not particularly limited, but from the viewpoint of handling, the length of the bag is preferably 1000 mm or less, and the body width is preferably 600 mm or less.

本考案の第１の実施態様は、外側クラフト紙の、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５以上であることである。
本考案の第２の実施態様は、内側クラフト紙の、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５以上であることである。
本考案の第３の実施態様は、外側クラフト紙および内側クラフト紙の両方が、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５以上であることである。 The first embodiment of the present invention is that the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag of the outer kraft paper is 25 or more.
A second embodiment of the present invention is that the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag of the inner kraft paper is 25 or more.
A third embodiment of the present invention is that both the outer kraft paper and the inner kraft paper have a product of 25 or more in the longitudinal tensile strength of the bag and the tensile elongation at break in the lateral direction of the bag.

本考案でいう引張強さおよび引張破断伸びは、ＪＩＳＰ８１１３に規定されている。また、袋の縦方向とは、袋の一端側の封かん部―他端側の充填口の方向、即ち袋の長さの方向であり、袋の横方向とは、縦方向に直交する方向、即ち袋の胴幅の方向である。
袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５に満たないと、胴部分や縦方向に裂けたり、封かん部の周辺が裂けたりし易くなる。袋の縦方向の引張強さと袋の横方向の引張破断伸びの積は、３５以上であることが好ましく、４５以上であることが特に好ましい。 The tensile strength and the tensile elongation at break referred to in the present invention are defined in JIS P8113. Further, the longitudinal direction of the bag is the direction of the sealing portion on one end side of the bag-the direction of the filling port on the other end side, that is, the length direction of the bag, and the lateral direction of the bag is a direction orthogonal to the longitudinal direction, That is, the direction of the bag width.
If the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag is less than 25, the body part and the longitudinal direction are easily torn and the periphery of the sealing part is easily torn. The product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag is preferably 35 or more, and particularly preferably 45 or more.

袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５以上とするためには、市場に出ている様々なクラフト紙のなかで、積が２５以上となるものを選択使用すればよい。クラフト紙の、袋の縦方向の引張強さは、５ｋＮ／ｍ以上であることが好ましく、５．５ｋＮ／ｍ以上であることが更に好ましい。クラフト紙の、袋の横方向の引張破断伸びは、５．０％以上であることが好ましく、５．５％以上であることが更に好ましい。 To make the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag more than 25, among the various craft papers on the market, the one with the product of 25 or more is selected and used do it. The tensile strength of the kraft paper in the longitudinal direction of the bag is preferably 5 kN / m or more, and more preferably 5.5 kN / m or more. The tensile elongation at break in the lateral direction of the bag of the kraft paper is preferably 5.0% or more, and more preferably 5.5% or more.

なお、本考案の重包装紙袋の表面或いは裏面には、ロゴマーク、写真、図案、内容物、生産者等を適宜印刷した印刷部を有してもよい。また、袋を滑りにくくするために、コロイダルシリカ系無機物やスチレン・アクリル系重合体などの公知の防滑剤による防滑処理を施されていてもよい。 In addition, you may have the printing part which printed the logo mark, the photograph, the design, the content, the producer, etc. suitably on the surface or back surface of the heavy wrapping paper bag of this invention. In addition, in order to make the bag difficult to slip, an anti-slip treatment with a known anti-slip agent such as a colloidal silica-based inorganic material or a styrene / acrylic polymer may be performed.

以下に、具体例を挙げて本考案を説明するが、本考案はこれらによって制約を受けるものではない。 The present invention will be described below with specific examples, but the present invention is not limited by these.

「クラフト紙の準備」
市販されているクラフト紙を用意し、その物性を表１に示す。なお、引張り強さ、引張り破断伸び、引裂き強さをＪＩＳＰ８１１３に基づいて測定した。 "Preparing Kraft Paper"
Commercially available kraft paper is prepared and the physical properties are shown in Table 1. The tensile strength, tensile elongation at break, and tear strength were measured based on JIS P8113.

内側クラフト紙と外側クラフト紙は同じクラフト紙を用い、Ａ方向を縦方向、Ｂ方向を横方向となるようにして、図２〜図５に示す重包装紙袋を製造した。袋の幅は４９０ｍｍ、長さは８００ｍｍとした。
得られた重包装紙袋に米を３０ｋｇ充填し、充填口を縛り、図１の状態にした。
充填した袋を水平状態（袋の裏面１０Ｒを下面）にして、高さ１．２ｍの位置から落下させた。この落下試験はＪＩＳＺ０２１７に従って行った。その試験結果を表２に示す。 The same kraft paper was used for the inner kraft paper and the outer kraft paper, and the heavy wrapping paper bag shown in FIGS. The width of the bag was 490 mm and the length was 800 mm.
The obtained heavy wrapping paper bag was filled with 30 kg of rice, the filling port was tied, and the state shown in FIG. 1 was obtained.
The filled bag was placed in a horizontal state (the back surface 10R of the bag was the bottom surface) and dropped from a position with a height of 1.2 m. This drop test was performed according to JIS Z0217. The test results are shown in Table 2.

このように、袋の縦方向の引張強さと袋の横方向の引張破断伸びの積が２５以上である実施例は、落下試験が９回までクリアしたが、２５未満である比較例は、引裂き強度が高いクラフト紙を使っているにも係わらず、３回で破袋するものであった。 Thus, in the example in which the product of the tensile strength in the longitudinal direction of the bag and the tensile elongation at break in the lateral direction of the bag was 25 or more, the drop test was cleared up to 9 times, but the comparative example that was less than 25 was torn. Despite the use of high strength kraft paper, the bag was broken three times.

１０米袋
１０Ｆ米袋の表面
１０Ｒ米袋の裏面
１１封かん部
１２充填口
１３外側クラフト紙
１３ｇ外側クラフト紙の貼合部
１４内側クラフト紙
１４ｇ内側クラフト紙の貼合部
１６口紐
１７折り返し部 DESCRIPTION OF SYMBOLS 10 Rice bag 10F The surface of rice bag 10R The back surface of rice bag 11 Sealing part 12 Filling port 13 Outer kraft paper 13g Outer kraft paper pasting part 14 Inner kraft paper 14g Inner kraft paper pasting part 16 Closure 17 Folding part

Claims

A heavy wrapping paper bag having a sealing part on one end side and a filling port on the other end side,
This heavy wrapping paper bag has a two-layer structure of inner kraft paper and outer kraft paper,
The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m ² or less, and a longitudinal tensile breaking elongation (JIS P 8113) of the bag is 9.5% or less,
A heavy wrapping paper bag, wherein the outer kraft paper has a product of a tensile strength (JIS P 8113) in the longitudinal direction of the bag and a tensile elongation at break (JIS P 8113) in the lateral direction of the bag of 25 or more.

A heavy wrapping paper bag having a sealing part on one end side and a filling port on the other end side,
This heavy wrapping paper bag has a two-layer structure of inner kraft paper and outer kraft paper,
The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m ² or less, and a longitudinal tensile breaking elongation (JIS P 8113) of the bag is 9.5% or less,
A heavy wrapping paper bag, wherein the inner kraft paper has a product of a tensile strength in the longitudinal direction of the bag (JIS P 8113) and a tensile elongation at break (JIS P 8113) in the lateral direction of the bag of 25 or more.

A heavy wrapping paper bag having a sealing part on one end side and a filling port on the other end side,
This heavy wrapping paper bag has a two-layer structure of inner kraft paper and outer kraft paper,
The inner kraft paper and the outer kraft paper have a basis weight of 81 g / m ² or less, and a longitudinal tensile breaking elongation (JIS P 8113) of the bag is 9.5% or less,
Both the outer kraft paper and the inner kraft paper have a product of 25 or more in the product of the tensile strength in the longitudinal direction of the bag (JIS P 8113) and the tensile elongation at break in the lateral direction of the bag (JIS P 8113). And heavy wrapping paper bag.

The heavy wrapping paper bag according to any one of claims 1 to 3, wherein the outer kraft paper has a product of a tensile strength in the longitudinal direction of the bag and a tensile breaking elongation in the lateral direction of the bag of 35 or more.

The heavy wrapping paper bag according to any one of claims 1 to 4, wherein the outer kraft paper has a product of a tensile strength in the longitudinal direction of the bag and a tensile breaking elongation in the lateral direction of the bag of 45 or more.

The heavy wrapping paper bag according to any one of claims 1 to 5, wherein the outer kraft paper has a longitudinal tensile strength of the bag of 5 kN / m or more.

The heavy wrapping paper bag according to any one of claims 1 to 6, wherein the outer kraft paper has a longitudinal tensile strength of the bag of 5.5 kN / m or more.

The heavy wrapping paper bag according to any one of claims 1 to 7, wherein the outer kraft paper has a lateral tensile breaking elongation of 5.0% or more.

The heavy wrapping paper bag according to any one of claims 1 to 8, wherein the outer kraft paper has a tensile breaking elongation in a lateral direction of the bag of 5.5% or more.

The heavy wrapping paper bag according to any one of claims 1 to 9, wherein the outer kraft paper has a tensile elongation at break of 5% or less in the longitudinal direction of the bag.

Said outer kraft paper and said inner kraft paper, basis weight of 81 g / ^{m 2} or less, heavy-duty packaging bag according to any one of claims 1 to 10 is 69 g / ^{m 2} or more.

The heavy wrapping paper bag according to any one of claims 1 to 11, wherein a basis weight of the outer kraft paper and the inner kraft paper is 78 g / m ² or less and 69 g / m ² or more.

The heavy wrapping paper bag according to any one of claims 1 to 12, wherein the outer kraft paper and the inner kraft paper are unbleached kraft paper.

The heavy wrapping paper bag according to any one of claims 1 to 13, wherein a length of the heavy wrapping paper bag is 750 mm or more and 1000 mm or less, and a trunk width is 400 mm or more and 600 mm or less.

The heavy wrapping paper bag according to any one of claims 1 to 14, wherein the heavy wrapping paper bag has a single-bottom beam structure with a paper band.

The heavy wrapping paper bag according to any one of claims 1 to 15, which is a heavy wrapping paper bag for containing grains.