JP6537375B2 - Corrugated cardboard box with a bulge control crease structure - Google Patents

Corrugated cardboard box with a bulge control crease structure Download PDF

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JP6537375B2
JP6537375B2 JP2015132516A JP2015132516A JP6537375B2 JP 6537375 B2 JP6537375 B2 JP 6537375B2 JP 2015132516 A JP2015132516 A JP 2015132516A JP 2015132516 A JP2015132516 A JP 2015132516A JP 6537375 B2 JP6537375 B2 JP 6537375B2
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side wall
cardboard box
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JP2017013856A (en
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一志 石井
一志 石井
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Rengo Co Ltd
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Description

この発明は、積上荷重による胴膨れ現象を抑制できる罫線構造を備えた段ボール箱に関するものである。   The present invention relates to a cardboard box provided with a creased line structure capable of suppressing a cylinder bulging phenomenon due to a loading load.

段ボール箱は、大きな積上荷重が作用すると、側面が高さ方向に湾曲するように膨らんで樽状の外観を呈する胴膨れが生じる場合があり、下記特許文献１〜３においては、このような胴膨れを抑制する罫線構造を備えた段ボール箱が提案されている。   In the case of a cardboard box, when a large load is applied, there may be a case where a side bulges so that the side curves in the height direction and a barrel-like appearance having a barrel-like appearance occurs. There has been proposed a cardboard box provided with a ruled line structure which suppresses a body swelling.

特許文献１には、図８に上下反転した状態で示す段ボール箱が記載されている。この段ボール箱では、側壁５１と底壁５２の境界部分に、折り曲げの軸線となる１本の軸折罫線５３と、これに対して側壁５１及び底壁５２の方向へ平行にずれた２本の補助折罫線５４とが、段ボールの厚さ方向に貫通する全切の切目５５を挟んで交互に入れられている。そして、側壁５１と底壁５２の境界部分の折り曲げに伴い、２本の補助折罫線５４の間の部分が傾斜し、１本の軸折罫線５３の周辺部分が引き締められるようになっている。   Patent Document 1 describes a cardboard box shown in FIG. 8 in a state of being turned upside down. In this cardboard box, at the boundary between the side wall 51 and the bottom wall 52, there is one axial crease 53 serving as an axis of bending and two lines shifted in parallel in the direction of the side wall 51 and the bottom wall 52 with respect to this. The auxiliary creases 54 are alternately inserted on both sides of the incision 55 which penetrates in the thickness direction of the cardboard. And with the bending of the boundary part of the side wall 51 and the bottom wall 52, the part between two auxiliary creases 54 inclines, and the peripheral part of one axial crease 53 is tightened.

特許文献２には、図９に上下反転した状態で示す段ボール箱が記載されている。この段ボール箱では、側壁６１と底壁６２の境界部分に、段ボールの裏面から、折り曲げの軸線となる１本の軸折罫線６３と、これに対して側壁６１及び底壁６２の方向へ平行にずれた２本の補助折罫線６４とが交互に入れられると共に、これらに挟まれた半切の切目６５が入れられ、段ボールの表面から、裏側の平行な２本の補助折罫線６４に沿って平行な２本の補助折罫線６６が連続的に入れられている。そして、側壁６１と底壁６２の境界部分の折り曲げに伴い、２本の補助折罫線６４の間の部分が傾斜し、１本の軸折罫線６３の周辺部分が引き締められるようになっている。   Patent Document 2 describes a cardboard box shown in FIG. 9 in a state of being turned upside down. In this cardboard box, from the back surface of the corrugated board at the boundary between the side wall 61 and the bottom wall 62, one axial fold line 63 serving as the bending axis and the direction parallel to the side wall 61 and the bottom wall 62 Two misaligned auxiliary creases 64 are alternately inserted, and a half cut 65 interposed therebetween is inserted, and from the surface of the cardboard, parallel along the two parallel auxiliary creases 64 on the back side. Two auxiliary creases 66 are continuously inserted. Then, along with the bending of the boundary portion between the side wall 61 and the bottom wall 62, the portion between the two auxiliary folding lines 64 is inclined, and the peripheral portion of one axial folding line 63 is tightened.

特許文献３には、図１０に示すブランクから成る段ボール箱が記載されている。このブランクでは、一対の側壁７１の間に底壁７２が挟まれるように連設され、一方の側壁７１に天壁７３が、他方の側壁７１に継代片７４が連設されている。そして、これらの境界部分に、折り曲げの軸線となる１本の軸折罫線７５が入れられると共に、これに平行な２本の補助折罫線７６が軸折罫線７５の両側に断続的に入れられている。軸折罫線７５と２本の補助折罫線７６とが並ぶ３本線部分は、組立状態における下側と上側とで、長さ方向に交互に存在するように配置されている。   Patent Document 3 describes a cardboard box made of a blank shown in FIG. In this blank, the bottom wall 72 is continuously provided so as to be sandwiched between the pair of side walls 71, and the top wall 73 is connected to one side wall 71, and the passage piece 74 is connected to the other side wall 71. And while one axial crease line 75 which becomes an axis line of bending is put in these boundary parts, two auxiliary auxiliary crease lines 76 parallel to this are inserted intermittently on both sides of axial crease line 75 There is. The three-line portion in which the axial fold line 75 and the two auxiliary fold lines 76 are arranged is arranged alternately in the length direction on the lower side and the upper side in the assembled state.

このブランクの組み立てに際し、物品を包み込むように一対の側壁７１、底壁７２及び天壁７３を折り曲げ、継代片７４を折り曲げて天壁７３に貼り付けると、１本の軸折罫線７５の部分は直角に折れ曲がり、軸折罫線７５と２本の補助折罫線７６とが並ぶ３本線部分では、軸折罫線７５と補助折罫線７６の間の部分が傾斜して順次折れ曲がる。   When assembling this blank, the side wall 71, the bottom wall 72 and the top wall 73 are bent so as to wrap the article, and the subjacent piece 74 is bent and attached to the top wall 73. In the three-line portion in which the axial fold line 75 and the two auxiliary fold lines 76 are lined, the portion between the axial fold line 75 and the auxiliary fold line 76 is inclined and sequentially bent.

上記特許文献１〜３に記載されたような罫線構造を備えた段ボール箱では、大きな積上荷重が作用しても、補助折罫線５４，６４，６６，７６の折曲角が変化して、高さ方向の変形が吸収されるので、側壁５１，６１，７１が膨らむ胴膨れ現象が抑制される。   In the corrugated box provided with the ruled line structure as described in Patent Documents 1 to 3 above, the bending angle of the auxiliary creased lines 54, 64, 66 and 76 changes even if a large load is applied. Since deformation in the height direction is absorbed, the bulging phenomenon in which the side walls 51, 61, 71 expand is suppressed.

特許第４１２６２０１号公報Patent No. 4126201 gazette 特許第５４６０５２１号公報Patent No. 5460521 gazette 特許第５６１２９５１号公報Patent No. 5612 591

しかしながら、図８に示すような罫線構造を備えた段ボール箱では、１本の軸折罫線５３と２本の補助折罫線５４の間に、組立時に開く切目５５が存在するので、密閉性や強度の面において不利となる問題があった。   However, in a cardboard box provided with a creased structure as shown in FIG. 8, since there is a cut 55 that opens at the time of assembly between one axial crease 53 and two auxiliary creases 54, the sealability and strength are improved. Problems that are disadvantageous in terms of

また、図９に示すような罫線構造を備えた段ボール箱では、裏面の補助折罫線６４と表面の補助折罫線６６とが組立時にほぼ重なるので、別の罫線として機能せず、段ボール自体の強度が弱い場合や、積上荷重が相当大きい場合には、十分に荷重を吸収しきれないことがあるほか、側壁６１に開封用としてライナーカットやジッパーの切目線が入れられていたり、開封窓が形成されていたりすると、積上荷重が作用したとき、その部分で座屈が生じる恐れもあった。   Further, in a cardboard box provided with a creased structure as shown in FIG. 9, the auxiliary creased line 64 on the back and the auxiliary creased line 66 on the surface substantially overlap at the time of assembly, so they do not function as separate creases. When the load is weak or when the loading load is quite large, the load may not be absorbed sufficiently, and the side wall 61 may have a liner cut or a zipper score line for opening or an opening window. If it is formed, there is also a possibility that buckling may occur at that portion when a loading load is applied.

また、図１０に示すような罫線構造を備えた段ボール箱では、２本の補助折罫線７６の間を軸折罫線７５が貫いていることから、組立時に予定どおり２本の補助折罫線７６の間の部分が傾斜しない可能性があり、傾斜しても傾斜部分の幅が狭いため、変位をあまり吸収できず、傾斜部分による直角部分の引き締め効果も得られないという問題があった。   Further, in the corrugated box provided with the creased structure as shown in FIG. 10, since the axial creases 75 penetrate between the two auxiliary creases 76, two auxiliary creases 76 are formed as planned at the time of assembly. There is a possibility that the portion between them does not incline, and the width of the inclined portion is narrow even if inclined, so there is a problem that the displacement can not be absorbed so much and the tightening effect of the right portion by the inclined portion can not be obtained.

そこで、この発明は、罫線構造による段ボール箱の胴膨れ抑制効果をさらに向上させると共に、側壁の意図しない座屈を防止し、密閉性も確保することを課題とする。   Then, this invention makes it a subject to further prevent the unintended buckling of a side wall while ensuring the sealing property also while improving further the cylinder swelling suppression effect of the corrugated-cardboard box by a creased line structure.

上記課題を解決するため、この発明は、側壁と底壁とが連設され、その境界部分を折り曲げて組み立てる段ボール箱において、側壁と底壁の境界部分には、折り曲げの軸線となる１本の軸折罫線と、これに対して側壁及び底壁の方向へずれた２本の補助折罫線とを交互に入れると共に、軸折罫線と平行な座屈誘導罫線を、軸折罫線に対応して断続的に、側壁の補助折罫線よりも上方に入れたことを特徴とする胴膨れ抑制罫線構造を備えたものを提供することとしたのである。   In order to solve the above problems, according to the present invention, in a corrugated cardboard box in which a side wall and a bottom wall are continuously provided and assembled by bending the boundary portion, one boundary axis of the side wall and the bottom wall serves as an axis of bending. An axial crease and two auxiliary creases offset in the direction of the side wall and the bottom wall are alternately inserted, and a buckling induction crease parallel to the axial crease corresponds to the axial crease. It is an object of the present invention to provide a cylinder provided with a cylinder bulging restraint ruled line structure characterized by being intermittently inserted above an auxiliary fold line on a side wall.

また、前記座屈誘導罫線は、軸折罫線及び補助折罫線よりも折曲抵抗が弱いものとし、座屈の誘導効果を高めるようにしたのである。   Further, the buckling induction ruled line has a bending resistance weaker than that of the axial creased line and the auxiliary creased line so as to enhance the buckling induction effect.

さらに、前記軸折罫線に臨む底壁側の部分に、段ボールを厚さ方向に押し潰して折曲抵抗を弱めた段潰部を形成し、軸折罫線を挟んだ折曲抵抗のバランスをとって、組み立てに際し、側壁と底壁とが所定の位置で折れ曲がるようにしたのである。   Furthermore, in the portion on the bottom wall side facing the axial creased line, a corrugated cardboard is crushed in the thickness direction to form a stepped collapse where the bending resistance is weakened, and balance of the bending resistance across the axial creased line is taken Thus, during assembly, the side walls and the bottom wall are bent at predetermined positions.

この発明に係る胴膨れ抑制罫線構造を備えた段ボール箱では、組み立てに際し、側壁と底壁の境界部分を折り曲げると、１本の軸折罫線に沿って側壁と底壁とが折れ曲がると共に、２本の補助折罫線の間の部分が傾斜し、軸折罫線の周辺部分が引き締められて、側壁に垂直方向の張力が作用する。   In the cardboard box provided with the cylinder expansion suppressing creased structure according to the present invention, when the boundary portion between the side wall and the bottom wall is bent in assembling, the side wall and the bottom wall are bent along one axial crease and two The portions between the auxiliary creases are inclined and the peripheral portions of the axial creases are tightened to exert a vertical tension on the side walls.

そして、積上荷重が作用したとき、２本の補助折罫線の折曲角が変化して高さ方向の湾曲するような変形が防止され、これに加えて、座屈誘導罫線に沿って側壁が折れ曲がることにより、高さ方向の湾曲するような変形が防止される。   When the loading load is applied, the bending angle of the two auxiliary folding lines is changed to prevent the bending deformation in the height direction, and in addition, the side wall along the buckling induction line By bending, the bending deformation in the height direction is prevented.

従って、段ボール自体の強度が弱い場合や、積上荷重が相当大きい場合でも、十分な胴膨れ抑制効果が得られ、側壁の意図しない座屈も防止される。また、側壁と底壁の境界部分に、組立時に開く切目を入れていないので、包装の密閉性も確保される。   Therefore, even when the strength of the corrugated board itself is weak or when the loading load is considerably large, a sufficient effect of suppressing the cylinder expansion can be obtained, and unintended buckling of the side wall is also prevented. In addition, since the boundary between the side wall and the bottom wall is not cut at the time of assembly, sealing of the package is also ensured.

この発明の実施形態に係る胴膨れ抑制罫線構造を備えた段ボール箱のブランクを示す図（裏面側）The figure which shows the blank of the corrugated-cardboard box provided with the body expansion suppression line | wire structure which concerns on embodiment of this invention (back side) 同上の胴膨れ抑制罫線構造を示す図１のＡ部拡大図The enlarged view of the A section of FIG. （ａ）図２のIII(a)−III(a)断面図、（ｂ）図２のIII(b)−III(b)断面図(A) III (a)-III (a) sectional view of Figure 2, (b) III (b)-III (b) sectional view of Figure 2 同上の組立状態を示す上方からの斜視図Top perspective view showing the assembled state of the same 同上の組立状態を示す下方からの斜視図A perspective view from below showing the assembled state same as above （ａ）図５のVI(a)−VI(a)断面図、（ｂ）図５のVI(b)−VI(b)断面図(A) VI (a)-VI (a) sectional view of Figure 5, (b) VI (b)-VI (b) sectional view of Figure 5 同上の積上荷重による図５のVI(a)−VI(a)断面の変形状態を示す図The figure which shows the deformation state of the VI (a)-VI (a) cross section of FIG. 5 by the loading load same as the above. 特許文献１に記載の胴膨れ抑制罫線構造を備えた段ボール箱の上下反転状態を示す斜視図The perspective view which shows the up-down inversion state of the corrugated-cardboard box provided with the cylinder expansion suppression ruled line structure of patent document 1 特許文献２に記載の胴膨れ抑制罫線構造を備えた段ボール箱の上下反転状態を示す斜視図The perspective view which shows the up-down inversion state of the corrugated-cardboard box provided with the cylinder expansion suppression ruled line structure of patent document 2 特許文献３に記載の胴膨れ抑制罫線構造を備えた段ボール箱のブランクを示す図The figure which shows the blank of the corrugated-card-board box provided with the cylinder | bulb bulging suppression ruled line structure of patent document 3

以下、この発明の実施形態を添付図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described based on the attached drawings.

この段ボール箱は、物品を包み込みながら組み立てられるラップラウンド式のものであり、図１に示すようなブランクから形成される。   The cardboard box is of a wrap-round type that is assembled while wrapping articles, and is formed of a blank as shown in FIG.

このブランクでは、一対の側壁１の間に底壁２が挟まれるように連設され、一方の側壁１に天壁３及び継代片４が順次連設されている。段ボールの中芯の段頂が延びる方向である段目方向は、積上荷重の作用方向を考慮して、これらの連設方向へ向けられている。また、側壁１の両端には内フラップ５がそれぞれ連設され、底壁２及び天壁３の両端には外フラップ６がそれぞれ連設されている。   In this blank, the bottom wall 2 is continuously provided so as to be sandwiched between the pair of side walls 1, and the top wall 3 and the passage piece 4 are sequentially provided in series on one side wall 1. The step direction, which is the direction in which the step top of the core of the corrugated board extends, is directed in the direction in which these steps are taken into consideration, in consideration of the action direction of the stack load. Further, the inner flaps 5 are connected to both ends of the side wall 1 respectively, and the outer flaps 6 are connected to both ends of the bottom wall 2 and the top wall 3 respectively.

一対の側壁１と底壁２の境界部分には、図２及び図３に示すように、折り曲げの軸線となる１本の軸折罫線７と、これに対して側壁１及び底壁２の方向へずれた２本の補助折罫線８とが交互に入れられると共に、軸折罫線７と平行な座屈誘導罫線９が、軸折罫線７に対応して断続的に、側壁１の補助折罫線８よりも上方となる位置に入れられている。   At the boundary between the pair of side walls 1 and the bottom wall 2, as shown in FIGS. 2 and 3, one axial crease 7 as an axis of bending and the direction of the side walls 1 and the bottom wall 2 Two auxiliary creases 8 which are misaligned are alternately inserted, and a buckling induction crease 9 parallel to the axial creases 7 is intermittently connected to the auxiliary creases of the side wall 1 corresponding to the axial creases 7. It is placed at a position above 8.

軸折罫線７、補助折罫線８及び座屈誘導罫線９は、段ボールを厚さ方向に貫通する切目と繋部とが交互に断続し、繋部に段ボールを裏面から押圧して押罫を入れたリード罫とされ、切目と繋部のピッチを調整して、折曲抵抗が適度に設定されている。   In the shaft folding line 7, the auxiliary folding line 8 and the buckling induction line 9, cuts and joints passing through the corrugated board in the thickness direction are alternately interrupted, and the corrugated board is pressed against the back from the back to insert creases. The bending resistance is set appropriately by adjusting the pitches of the incisions and the connecting portions.

ここで、座屈誘導罫線９は、軸折罫線７及び補助折罫線８よりも繋部の総和が短く、折曲抵抗が弱いものとなっている。 Here, buckling inductive borders 9, the sum of the connecting portion than Jikuori borders 7 and the auxiliary folding border 8 is short, it has become a bending resistance is weak.

底壁２の軸折罫線７に臨む部分には、段ボールを厚さ方向に押し潰して折曲抵抗を弱めた段潰部１０が形成されている。   At a portion of the bottom wall 2 facing the axial creased line 7, a step crushing portion 10 is formed in which the corrugated cardboard is crushed in the thickness direction to weaken bending resistance.

側壁１には、開封用としてミシン目状の切目線１１が入れられ、これに続いて、内フラップ５にも、鉤状の切目が断続するジッパー型の切目線１１が入れられている。側壁１における切目線１１の中間部には、押込に伴い開口する手入穴１２が切目線及びヒンジとなる折目線を入れることにより形成されている。   The side wall 1 is provided with a perforated score line 11 for opening, and subsequently, the inner flap 5 is provided with a zipper type score line 11 in which a wedge-shaped cut is interrupted. In the middle part of the score line 11 in the side wall 1, a manual entry hole 12 which is opened with the pressing is formed by inserting a fold line which becomes a score line and a hinge.

また、側壁１には、開封時に撓んで力が伝わりやすくなるように、手入穴１２の近傍から上方となる方向へＶ字状をなすように延びる可撓罫線１３と、切目線１１の内フラップ５寄りの端部近傍から可撓罫線１３の終端部近傍へ延びる斜め方向の可撓罫線１４とが入れられている。可撓罫線１３は、段ボールを裏面から押圧した通常の罫線とされ、可撓罫線１４は、段ボールを表面から押圧した逆罫線とされている。   Further, in the side wall 1, flexible ruled lines 13 extending in a V shape in the upward direction from the vicinity of the entry hole 12 and a part of the score line 11 so that the force is easily transmitted by bending at the time of opening. An oblique flexible ruled line 14 extending from the vicinity of the end near the flap 5 to the vicinity of the end of the flexible crease 13 is inserted. The flexible ruled line 13 is a normal ruled line in which the cardboard is pressed from the back surface, and the flexible ruled line 14 is a reverse ruled line in which the cardboard is pressed from the front surface.

このようなブランクを、図４及び図５に示す形態に組み立てて物品を包装するには、物品を包み込むように、一対の側壁１と底壁２及び天壁３の境界部分を折り曲げ、天壁３から継代片４を折り曲げて他方の側壁１に貼り付ける。そして、内フラップ５及び外フラップ６を順次折り曲げて貼り合わせ、端面を閉止する。   In order to assemble such a blank into the configuration shown in FIGS. 4 and 5 and wrap the article, the boundary portion between the pair of side walls 1 and the bottom wall 2 and the ceiling wall 3 is bent to wrap the article, Passage piece 4 is folded from 3 and attached to the other side wall 1. Then, the inner flap 5 and the outer flap 6 are sequentially bent and attached to each other, and the end face is closed.

上記のような段ボール箱では、組み立てに際し、側壁１と底壁２の境界部分を折り曲げたとき、図６（ａ）に示すように、１本の軸折罫線７に沿って側壁１と底壁２とが直角に折れ曲がり、図６（ｂ）に示すように、２本の補助折罫線８の間の部分が傾斜し、軸折罫線７の周辺部分が引き締められて、側壁１に垂直方向の張力が作用する。   In such a cardboard box as described above, when the boundary portion between the side wall 1 and the bottom wall 2 is bent in assembling, as shown in FIG. 6A, the side wall 1 and the bottom wall along one axial fold line 7 2 is bent at a right angle, and as shown in FIG. 6 (b), the portion between the two auxiliary creases 8 is inclined, the peripheral portion of the axial crease 7 is tightened, and Tension acts.

また、軸折罫線７に臨む底壁２側の部分に、段ボールを厚さ方向に押し潰して折曲抵抗を弱めた段潰部１０が形成されているので、軸折罫線７を挟んだ座屈誘導罫線９と段潰部１０の折曲抵抗のバランスがとられ、組み立てに際し、側壁１と底壁２とが一方に引っ張られることなく、所定の位置で折れ曲がる。   In addition, since a stepped crushing portion 10 is formed in the portion on the bottom wall 2 side facing the axial creased line 7 by crushing the cardboard in the thickness direction to weaken the bending resistance, a seat that sandwiches the axial creased line 7 The bending resistances of the bending induction ruled line 9 and the step crushing portion 10 are balanced, and the side wall 1 and the bottom wall 2 are bent at a predetermined position without being pulled to one side at the time of assembly.

そして、積上荷重が作用したとき、図７に示すように、２本の補助折罫線８の折曲角が変化して高さ方向の湾曲するような変形が防止され、これに加えて、座屈誘導罫線９に沿って側壁１が折れ曲がることにより、高さ方向の湾曲するような変形が防止される。   When the loading load is applied, as shown in FIG. 7, the bending angle of the two auxiliary fold lines 8 is changed to prevent the bending deformation in the height direction, and in addition to this, By bending the side wall 1 along the buckling induction crease 9, bending deformation in the height direction is prevented.

このとき、座屈誘導罫線９は、軸折罫線７及び補助折罫線８よりも折曲抵抗が弱いものとされているので、座屈の誘導効果が高められる。また、座屈誘導罫線９が途切れた部分では、側壁１が座屈に抗し、耐圧強度が確保される。   At this time, the buckling induction ruled line 9 is considered to be weaker in bending resistance than the axial creased ruled line 7 and the auxiliary creased line 8, so that the buckling induction effect is enhanced. Moreover, in the part in which the buckling induction ruled line 9 was interrupted, the side wall 1 resists the buckling and the pressure resistance is secured.

従って、段ボール自体の強度が弱い場合や、積上荷重が相当大きい場合でも、十分な胴膨れ抑制効果が得られ、側壁１が中間部の切目線１１に沿って座屈するような現象も防止される。また、側壁１と底壁２の境界部分に、組立時に開く切目を入れていないので、包装の密閉性も確保される。   Therefore, even when the strength of the cardboard itself is weak, or even when the loading load is considerably large, a sufficient effect of suppressing the cylinder expansion can be obtained, and the phenomenon that the side wall 1 is buckled along the middle score line 11 is also prevented. Ru. Further, since the boundary portion between the side wall 1 and the bottom wall 2 is not cut open at the time of assembly, the sealing property of the package is also ensured.

なお、上記実施形態では、軸折罫線７、補助折罫線８及び座屈誘導罫線９がリード罫であるものを例示したが、軸折罫線７、補助折罫線８及び座屈誘導罫線９は、これに限定されるものではなく、材料の段ボールの厚さや強度を考慮して、押罫だけから構成されるものとしてもよい。   In the above embodiment, the axial creases 7, the auxiliary creases 8 and the buckling induction creases 9 are illustrated as lead creases, but the axial creases 7, the auxiliary creases 8 and the buckling induction creases 9 are as follows. The present invention is not limited to this, and may be formed only of creases in consideration of the thickness and strength of the corrugated cardboard of the material.

また、側壁１と底壁２の境界部分の複数個の断続する軸折罫線７につき、全ての軸折罫線７に対応して座屈誘導罫線９を入れたものを例示したが、座屈誘導罫線９は、全ての軸折罫線７に対応して入れる必要はなく、座屈誘導罫線９の付与を、両端に位置する軸折罫線７に対して省略したり、間欠的に軸折罫線７に対応して入れるようにしてもよい。   Also, for the plurality of intermittent axial creases 7 in the boundary portion between the side wall 1 and the bottom wall 2, the buckling induction creases 9 are illustrated corresponding to all the axial creases 7, but the buckling induction is illustrated. It is not necessary to insert the ruled lines 9 in correspondence to all the axial creases 7. The application of the buckling induction creases 9 may be omitted with respect to the axial creases 7 located at both ends, or the axial creases 7 may be intermittently made. It may be inserted corresponding to.

また、段ボール箱の形式として、ラップラウンド式のものを例示したが、周壁をなす各一対の側壁及び端壁からそれぞれ内フラップ及び外フラップを延出し、内フラップと外フラップとを重ね合わせて底壁及び天壁を形成する溝切型段ボール箱や、底壁の周囲各辺に連設した側壁を起立させて形成するトレイ状の段ボール箱においても、同様の罫線構造を採用することにより、胴膨れ現象を抑制することができる。   In addition, although a wrap-round type has been illustrated as the type of cardboard box, the inner flaps and the outer flaps are respectively extended from the pair of side walls and end walls forming the peripheral wall, and the inner flaps and the outer flaps are overlapped to form a bottom. A grooved cardboard box forming a wall and a top wall, and a tray-shaped cardboard box formed by raising side walls continuously connected to each side around the bottom wall also adopt the same creased structure. The swelling phenomenon can be suppressed.

１ 側壁
２ 底壁
３ 天壁
４ 継代片
５ 内フラップ
６ 外フラップ
７ 軸折罫線
８ 補助折罫線
９ 座屈誘導罫線
１０ 段潰部
１１ 切目線
１２ 手入穴
１３，１４ 可撓罫線 DESCRIPTION OF SYMBOLS 1 side wall 2 bottom wall 3 ceiling wall 4 passage piece 5 inner flap 6 outer flap 7 axial fold line 8 auxiliary fold line 9 buckling induction rule line 10 step crushing part 11 score line 12 manual hole 13, 14 flexible crease line

Claims (3)

側壁(1)と底壁(2)とが連設され、その境界部分を折り曲げて組み立てる段ボール箱において、側壁(1)と底壁(2)の境界部分には、折り曲げの軸線となる１本の軸折罫線(7)と、これに対して側壁(1)及び底壁(2)の方向へずれた２本の補助折罫線(8)とを交互に入れると共に、軸折罫線(7)と平行な座屈誘導罫線(9)を、軸折罫線(7)に対応して断続的に、側壁(1)の補助折罫線(8)よりも上方に入れたことを特徴とする胴膨れ抑制罫線構造を備えた段ボール箱。   In the cardboard box in which the side wall (1) and the bottom wall (2) are continuously connected and assembled by bending the boundary portion thereof, in the boundary portion between the side wall (1) and the bottom wall (2) And alternately insert the two auxiliary folding lines (8) shifted in the direction of the side wall (1) and the bottom wall (2) with the axial folding line (7) And a buckling guide line (9) parallel to the upper and lower sides of the side wall (1) is intermittently inserted above the auxiliary folding line (8) corresponding to the axial folding line (7). Cardboard box with retarded border structure. 前記座屈誘導罫線(9)は、軸折罫線(7)及び補助折罫線(8)よりも折曲抵抗が弱いものとしたことを特徴とする請求項１に記載の胴膨れ抑制罫線構造を備えた段ボール箱。   The cylinder bulging restraint ruled line structure according to claim 1, characterized in that the buckling induction ruled line (9) has a bending resistance weaker than that of the axial fold ruled line (7) and the auxiliary fold ruled line (8). Cardboard box equipped. 前記軸折罫線(7)に臨む底壁(2)側の部分に、段ボールを厚さ方向に押し潰して折曲抵抗を弱めた段潰部(10)を形成したことを特徴とする請求項１又は２に記載の胴膨れ抑制罫線構造を備えた段ボール箱。   A corrugated part is crushed in the thickness direction to form a step-collapsed part (10) in which bending resistance is weakened at a portion on the bottom wall (2) side facing the axial creased line (7). The corrugated-cardboard box provided with the body swelling suppression creased structure as described in 1 or 2.
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