JP6132663B2 - Corrugated cardboard box - Google Patents

Corrugated cardboard box Download PDF

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JP6132663B2
JP6132663B2 JP2013116616A JP2013116616A JP6132663B2 JP 6132663 B2 JP6132663 B2 JP 6132663B2 JP 2013116616 A JP2013116616 A JP 2013116616A JP 2013116616 A JP2013116616 A JP 2013116616A JP 6132663 B2 JP6132663 B2 JP 6132663B2
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flap
inner flap
line
cardboard box
corrugated cardboard
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JP2014234207A (en
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賢司 十代
賢司 十代
杉田　裕紀
裕紀 杉田
ちあき 尾上
ちあき 尾上
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Rengo Co Ltd
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Description

この発明は、天面のフラップの基部に面取り部を形成した胴膨れ防止段ボール箱に関するものである。   The present invention relates to a torsion-preventing corrugated cardboard box in which a chamfered portion is formed at the base of a top surface flap.

従来、液入ボトル等の商品を梱包する段ボール箱として、下記特許文献１には、図７に示すようなものが記載されている。   Conventionally, as a corrugated cardboard box for packing a product such as a liquid-filled bottle, the one shown in FIG.

この段ボール箱は、側板５１及び端板５２をそれぞれ対向させて角筒状をなす周壁を形成し、端板５２の下端及び上端から延びる内フラップ５３と、側板５１の下端及び上端から延びる外フラップ５４とを順次折り重ねて底面及び天面を閉止するものである。   The corrugated cardboard box has a side wall 51 and an end plate 52 facing each other to form a peripheral wall having a rectangular tube shape. The inner flap 53 extends from the lower end and the upper end of the end plate 52, and the outer flap extends from the lower end and the upper end of the side plate 51. 54 are sequentially folded to close the bottom surface and the top surface.

そして、底面及び天面の内フラップ５３及び外フラップ５４の基部に、それぞれ端板５２及び側板５１との境界の折目線５２ａ，５１ａと平行する折目線５３ａ，５４ａを入れて面取り部５６，５７を形成し、段積み時の積上荷重による樽状の変形を防止するように構成されている。   Then, crease lines 53a and 54a parallel to the crease lines 52a and 51a at the boundary between the end plate 52 and the side plate 51 are put in the base portions of the inner flap 53 and the outer flap 54 on the bottom surface and the top surface, respectively, and the chamfered portions 56 and 57 are placed. And is configured to prevent barrel-like deformation due to a loading load at the time of stacking.

特開２００９−２１４９２５号公報JP 2009-214925 A

しかしながら、上記のような段ボール箱では、商品梱包のための組立時に、内フラップ５３を折り曲げた後、外フラップ５４を折り曲げる際、外フラップ５４の基部が内フラップ５３の側端部に衝突し、外フラップ５４の折り曲げに支障が生じるおそれがある。   However, in the cardboard box as described above, when the outer flap 54 is folded after the inner flap 53 is folded at the time of assembling for product packaging, the base of the outer flap 54 collides with the side end of the inner flap 53, There is a risk that the outer flap 54 may be bent.

このような現象の回避策として、段ボール箱の製造時におけるブランクの打ち抜きに際し、内フラップ５３の側端部を切断しておくことが考えられるが、この場合、いわゆる抜きカスが発生し、その除去処置に手間がかかるほか、梱包状態において天面角部に隙間があき、流通過程で箱内に塵埃が侵入するおそれもある。   As a workaround for such a phenomenon, it is conceivable to cut the side end portion of the inner flap 53 at the time of punching the blank at the time of manufacturing the cardboard box. In this case, a so-called punched residue is generated and removed. In addition to troublesome treatment, there is a gap in the top corners in the packaged state, and dust may enter the box during the distribution process.

そこで、この発明は、胴膨れ防止段ボール箱の製造時における抜きカスの発生を防止すると共に、梱包状態での隙間の発生を防止することを課題とする。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the occurrence of punching waste during the manufacture of a cardboard box for preventing the swelling of a trunk and to prevent the generation of a gap in the packaged state.

上記課題を解決するため、この発明では、側板及び端板をそれぞれ対向させて角筒状の周壁を形成し、端板及び側板の上端からそれぞれ延びる内フラップ及び外フラップを順次折り重ねて天面を閉止すると共に、内フラップ及び外フラップの基部に、それぞれ端板及び側板との境界の折目線から間隔をおいて折目線を入れることにより、傾斜した面取り部を形成し、段積み時の積上荷重による樽状の変形を防止する段ボール箱において、前記内フラップの側端部には、面取り部で基部側の角から斜め内側へ延びる斜折線と、面取り部より先端側で側端縁から間隔をおいて入れた側折線とで区画される部分が、外フラップの折曲時に外フラップの基部に押圧されて折れ曲がるように、弱め加工を施したのである。   In order to solve the above problems, in the present invention, the side plate and the end plate are opposed to each other to form a square cylindrical peripheral wall, and the inner flap and the outer flap extending from the upper end of the end plate and the side plate are sequentially folded, and the top surface In addition, an inclined chamfered portion is formed at the base of the inner flap and the outer flap at a distance from the crease line at the boundary with the end plate and the side plate, respectively. In the corrugated cardboard box that prevents the barrel-like deformation due to the upper load, the side end of the inner flap has a diagonal line extending obliquely inward from the corner on the base side at the chamfered portion, and from the side edge on the tip side from the chamfered portion. A weakening process was performed so that the portion defined by the side folding lines inserted at intervals was bent by being pressed by the base of the outer flap when the outer flap was bent.

また、前記弱め加工として、全切りの切目がミシン目状に断続する切目線若しくは半切りの切目線を入れ、又は段ボールを線状に押し潰した押罫線を入れたのである。   In addition, as the weakening process, a cut line in which all cuts are intermittently formed in a perforation or a half cut line is inserted, or a ruled line in which a corrugated cardboard is crushed in a linear form.

また、前記弱め加工として、内フラップの側端部の斜折線と側折線とで区画される部分に、段ボールの中芯を押し潰して段潰弱め部を形成したのである。   Further, as the weakening process, a corrugated weakening portion is formed by crushing the core of the corrugated cardboard at a portion defined by the oblique fold line and the side fold line at the side end portion of the inner flap.

この発明に係る段ボール箱では、梱包過程において、内フラップを折り曲げた後、外フラップを折り曲げる際、弱め加工を施した内フラップの側端部が外フラップの基部に押圧されて折れ曲がるので、外フラップを支障なく折り曲げて封緘することができる。   In the cardboard box according to the present invention, when the outer flap is bent after the inner flap is bent in the packing process, the side end of the weakened inner flap is pressed against the base of the outer flap and bent. Can be folded and sealed without hindrance.

また、製造時におけるブランクの打ち抜きに際し、内フラップの側端部を切断しておく必要がないので、抜きカスが発生することがなく、抜きカス除去の手間を軽減でき、梱包状態で天面角部に隙間があくこともないので、箱内への塵埃の侵入を防止できる。   In addition, it is not necessary to cut the side edge of the inner flap when punching a blank at the time of manufacture. Since there is no gap in the part, it is possible to prevent dust from entering the box.

そして、流通過程で段積みされ、大きな積上荷重が作用しても、面取り部の傾斜角度の変化により、変形が吸収されるので、樽状となる胴膨れが防止される。   And even if it piles up in the distribution | distribution process and a big loading load acts, since a deformation | transformation is absorbed by the change of the inclination angle of a chamfering part, the barrel swelling which becomes a barrel shape is prevented.

この発明の実施形態に係る胴膨れ防止段ボール箱のブランクを示す図The figure which shows the blank of the swelling cardboard box which concerns on embodiment of this invention 同上の梱包過程における商品挿入時の状態を示す斜視図The perspective view which shows the state at the time of goods insertion in the packing process same as the above 同上の内フラップの折曲状態を示す斜視図The perspective view which shows the bending state of an inner flap same as the above 同上の外フラップの折曲過程を示す部分拡大斜視図The partial expansion perspective view which shows the bending process of an outer flap same as the above 同上の梱包状態を示す斜視図The perspective view which shows a packing state same as the above 同上の弱め加工として（ａ）押罫線を施し、又は（ｂ）段潰しを施した例を示すブランクの一部拡大図A partially enlarged view of a blank showing an example in which (a) a ruled line is given as a weakening process or (b) a crushed shape is given. 従来の胴膨れ防止段ボール箱の梱包状態を示す斜視図The perspective view which shows the packing state of the conventional cardboard box which prevents swelling

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。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

この段ボール箱は、図１に示す段ボール製のブランクから組み立てられる。このブランクでは、周壁の長面をなす側板１及び幅面をなす端板２が各一対交互に連設され、一方の側板１の外側端に継代片３が連設されている。端板２及び側板１の下端には、それぞれ内フラップ４及び外フラップ５が連設され、端板２及び側板１の下端には、それぞれ内フラップ６及び外フラップ７が連設されている。これらの境界をなす折目線は、段ボールを裏面側から線状に押し潰した押罫線とされている。   This cardboard box is assembled from a cardboard blank shown in FIG. In this blank, a pair of side plates 1 forming a long surface of a peripheral wall and end plates 2 forming a width surface are alternately connected to each other, and a passage piece 3 is connected to the outer end of one side plate 1. An inner flap 4 and an outer flap 5 are connected to the lower ends of the end plate 2 and the side plate 1, respectively, and an inner flap 6 and an outer flap 7 are connected to the lower ends of the end plate 2 and the side plate 1, respectively. The crease line forming these boundaries is a ruled line obtained by crushing the corrugated cardboard from the back side.

上方の内フラップ６及び外フラップ７の基部には、それぞれ端板２及び側板１との境界の折目線２ａ，１ａと平行する折目線６ａ，７ａが入れられ、折目線６ａ，７ａもまた、段ボールを裏面側から線状に押し潰した押罫線とされている。折目線２ａ，６ａ間の部分及び折目線１ａ，７ａ間の部分は、それぞれ面取り部８，９となる部分である。   At the bases of the upper inner flap 6 and the outer flap 7, the crease lines 6a and 7a parallel to the crease lines 2a and 1a at the boundary with the end plate 2 and the side plate 1 are put, respectively, and the crease lines 6a and 7a are also It is a ruled line obtained by crushing the cardboard in a linear shape from the back side. The portion between the crease lines 2a and 6a and the portion between the crease lines 1a and 7a are portions that become chamfered portions 8 and 9, respectively.

上方の内フラップ６の両側端部には、面取り部８において、基部側の角から斜め内側へ向かって折目線６ａまで延びる仮想的な斜折線１０上に切目線２１が入れられている。また、面取り部８より先端側において、斜折線１０と折目線６ａの交差部から側端縁に平行する仮想的な側折線１１上に切目線２２が入れられ、切目線１１と側端縁との間に、これらに平行する切目線２３が入れられている。そして、斜折線１０と側折線１１とで区画された切目線２１，２２，２３を有する部分が弱め加工を施した部分となっている。   At both end portions of the upper inner flap 6, a cut line 21 is formed on a hypothetical oblique fold line 10 that extends from the corner on the base side to the crease line 6 a obliquely inward in the chamfered portion 8. Further, on the tip side from the chamfered portion 8, a cut line 22 is put on a virtual side fold line 11 parallel to the side edge from the intersection of the oblique fold line 10 and the crease line 6a, and the cut line 11 and the side edge Between these, a cut line 23 parallel to these is inserted. And the part which has the cut lines 21, 22, and 23 divided by the diagonal fold line 10 and the side fold line 11 is a part which gave the weakening process.

なお、切目線２１，２２，２３は、切目が段ボールの表裏に貫通する全切りとされ、このうち切目線２２，２３は、切目がミシン目状に断続するものとされている。   The cut lines 21, 22, and 23 are all cuts through which the cuts penetrate the front and back of the cardboard. Of these, the cut lines 22 and 23 are cut and formed in a perforated form.

また、内フラップ４，６には、基部を除いて、段ボールの波状の中芯を押し潰す段潰し加工が施されている（図１の斜線部）。これは、商品を梱包した際、内フラップ４，６と外フラップ５，７とが重ならない部分において、外フラップ５，７と商品との間に生じる隙間を極力抑制するためである。   Further, the inner flaps 4 and 6 are subjected to a step crushing process that crushes the corrugated core of the corrugated cardboard except for the base (shaded portion in FIG. 1). This is to suppress a gap generated between the outer flaps 5 and 7 and the product as much as possible in a portion where the inner flaps 4 and 6 and the outer flaps 5 and 7 do not overlap when the product is packed.

このようなブランクを組み立てて、商品である洗口液入りのボトルを梱包する際には、図２に示すように、各一対の側板１及び端板２を四角筒状の周壁を形成するように折り曲げ、下方の内フラップ４及び外フラップ５を順次折り重ね、接着剤又はテープで内フラップ４と外フラップ５とを固定して底面を閉止した状態で、天面の開口部から箱内に所定本数のボトルＢを挿入する。   When assembling such a blank and packing a bottle containing mouthwash, which is a product, as shown in FIG. 2, each pair of side plates 1 and end plates 2 is formed with a square cylindrical peripheral wall. The inner flap 4 and the outer flap 5 are folded in order, the inner flap 4 and the outer flap 5 are fixed with an adhesive or tape, and the bottom surface is closed. A predetermined number of bottles B are inserted.

次に、図３に示すように、上方の内フラップ６を内側へ折り曲げると、内フラップ６の面取り部８がボトルＢの頭部に沿って折目線２ａ側から折目線６ａ側へかけて次第に高くなるように傾斜し、面取り部８より先端側の部分がボトルＢの頭部に載って、水平に支持された状態となる。   Next, as shown in FIG. 3, when the upper inner flap 6 is folded inward, the chamfered portion 8 of the inner flap 6 gradually moves from the crease line 2a side to the crease line 6a side along the head of the bottle B. It inclines so that it may become high, and the part of the front end side from the chamfering part 8 will be in the state supported on the head of the bottle B, and supported horizontally.

続いて、図４に示すように、外フラップ７を内側へ折り曲げると、内フラップ６の側端部が外フラップ７の基部に押圧され、切目線２１，２２，２３を軸にボトルＢの頭部に沿って下方へ折れ曲がり、内フラップ６の側端と外フラップ７との衝突が回避される。   Subsequently, as shown in FIG. 4, when the outer flap 7 is bent inward, the side end of the inner flap 6 is pressed against the base of the outer flap 7, and the head of the bottle B is centered on the cut lines 21, 22, and 23. It bends downward along the part, and collision between the side end of the inner flap 6 and the outer flap 7 is avoided.

そして、図５に示すように、外フラップ７をさらに折り曲げると、外フラップ７が折目線７ａを軸に屈曲しつつ、内フラップ６の上面に重なり、面取り部９が折目線１ａ側から折目線７ａ側へかけて次第に高くなるように傾斜すると共に、面取り部９より先端側の部分がボトルＢの頭部により水平に支持された状態となり、接着剤又はテープで内フラップ６と外フラップ７とを固定すると、天面が閉止されて封緘が完了する。   Then, as shown in FIG. 5, when the outer flap 7 is further bent, the outer flap 7 is bent about the crease line 7a and overlaps the upper surface of the inner flap 6, and the chamfered portion 9 is creased from the crease line 1a side. 7a, and the tip end side of the chamfered portion 9 is horizontally supported by the head of the bottle B. The inner flap 6 and the outer flap 7 are bonded with an adhesive or tape. When is fixed, the top is closed and sealing is completed.

このように、上記のような段ボール箱では、梱包過程において、天面を閉止するため、内フラップ６を折り曲げた後、外フラップ７を折り曲げる際、切目線２１，２２，２３を入れて弱め加工を施した内フラップ６の側端部が外フラップ７の基部に押圧されて折れ曲がるので、外フラップ７を支障なく折り曲げて封緘することができる。   Thus, in the corrugated cardboard box as described above, in order to close the top surface in the packing process, when the outer flap 7 is folded after the inner flap 6 is folded, the cut lines 21, 22, and 23 are inserted and weakened. Since the side end portion of the inner flap 6 subjected to the above is pressed and bent by the base portion of the outer flap 7, the outer flap 7 can be bent and sealed without any trouble.

また、製造時におけるブランクの打ち抜きに際し、内フラップ６の側端部を切断しておく必要がないので、抜きカスが発生することがなく、抜きカス除去の手間を軽減でき、梱包状態で天面角部に隙間があくこともないので、箱内への塵埃の侵入を防止できる。   Moreover, since it is not necessary to cut the side end of the inner flap 6 when punching a blank at the time of manufacture, there is no occurrence of a waste, and the trouble of removing the waste can be reduced. Since there is no gap in the corner, it is possible to prevent dust from entering the box.

そして、流通過程で段積みされ、大きな積上荷重が作用しても、面取り部８，９の傾斜角度の変化により、変形が吸収されるので、樽状となる胴膨れが防止される。   And even if a large stacking load is applied in the distribution process, the deformation is absorbed by the change in the inclination angle of the chamfered portions 8 and 9, so that the barrel-shaped swelling is prevented.

なお、上記実施形態では、内フラップ６の側端部に施す弱め加工として、切目線２１，２２，２３を入れ、その切目を全切りとし、切目線２２，２３の切目をミシン目状に断続させたものを例示したが、これらに代えて、図６（ａ）に示すように、段ボールを裏面から線状に押し潰した押罫線２４，２５，２６を入れてもよく、段ボールを厚さ方向の半分程度切り込んだ半切線を入れてもよい。   In the above-described embodiment, as the weakening process applied to the side end portion of the inner flap 6, the cut lines 21, 22, and 23 are entered, the cuts are completely cut, and the cuts of the cut lines 22 and 23 are intermittently formed in a perforated shape. However, instead of these, as shown in FIG. 6 (a), ruled lines 24, 25, and 26 in which the corrugated board is crushed linearly from the back surface may be inserted, and the corrugated board is thickened. A half-cut line cut by about half of the direction may be inserted.

そのほか、これらに代える弱め加工として、図６（ｂ）に示すように、内フラップ６の側端部の斜折線１０と側折線１１とで区画される部分において、段ボールの波状の中芯を押し潰す段潰し加工を施し、段潰弱め部２７を形成してもよい。この例において、内フラップ６に商品との隙間調整用の段潰し加工（図１の斜線部参照）を施す場合には、段潰弱め部２７の段潰し加工を、隙間調整用の段潰し加工よりも強く施すとよい。   In addition, as a weakening process in place of these, as shown in FIG. 6 (b), the corrugated core of the corrugated cardboard is pushed at the portion defined by the oblique fold line 10 and the side fold line 11 at the side end of the inner flap 6. The crushing process which crushes may be performed and the crushing weakening part 27 may be formed. In this example, when the inner flap 6 is subjected to a crushing process for adjusting a gap with a product (see the hatched portion in FIG. 1), the crushing process of the crushing weakening part 27 is performed by a crushing process for adjusting the gap. It is better to apply more strongly.

また、弱め加工部分を区画する斜折線１０と側折線１１とがそれぞれ直線となったものを例示したが、その一方又は両方が曲線となっていてもよい。   Moreover, although the diagonal fold line 10 and the side fold line 11 which divide a weakening process part were illustrated respectively as a straight line, the one or both may become a curve.

また、内フラップ６の先端側の角部が直角となったものを例示したが、ケーサーでの封緘性を考慮して、内フラップ６の先端側の角部を斜めに直線的に切断したり、膨出弧状に切断したりしてもよい。   Moreover, although the corner | angular part by the side of the front end of the inner flap 6 was illustrated at right angle, considering the sealing property in a caser, the corner | angular part by the side of the front end of the inner flap 6 was diagonally cut | disconnected linearly. Alternatively, it may be cut into a bulging arc shape.

また、上記実施形態では、段ボール箱の上部にのみ面取り部８，９を設けたものを例示したが、段ボール箱の下部にも面取り部を設ける場合には、下方の内フラップ４の側端部にも、上記のような弱め加工を施しておくとよい。   Moreover, in the said embodiment, although what chamfered part 8 and 9 was provided only in the upper part of a cardboard box was illustrated, when providing a chamfer part also in the lower part of a cardboard box, the side edge part of the lower inner flap 4 is provided. In addition, it is advisable to apply a weakening process as described above.

さらに、上記実施形態では、底面及び天面ともに内フラップ４，６及び外フラップ５，７を折り重ねて閉止する溝切型の段ボール箱について例示したが、底面側については、対角から斜めに折目線を入れると共に、隣り合う底板の一部分を貼り合わせておき、折畳状態から迅速に組み立てられるようにしたワンタッチ底と呼ばれる構造や、各一対の側板１及び端板２から延びる底板の端縁に凹凸や斜辺を形成し、底板同士を簡単に噛み合わせられるようにしたセミワンタッチ底と呼ばれる構造としてもよい。また、底面が開口した蓋部分とトレイとから成る２ピースの段ボール箱において、蓋部分の天面に上記構成を適用してもよい。   Furthermore, in the said embodiment, although illustrated about the fluted type corrugated cardboard box which folds and closes the inner flaps 4 and 6 and the outer flaps 5 and 7 on both the bottom face and the top face, the bottom face side is inclined diagonally from the diagonal. A structure called a one-touch bottom, in which a crease line is inserted and a part of the adjacent bottom plate is pasted together so that it can be quickly assembled from the folded state, and the edge of the bottom plate extending from each pair of side plates 1 and end plates 2 A structure called a semi-one touch bottom may be used in which irregularities and oblique sides are formed in the base plate so that the bottom plates can be easily engaged with each other. Further, in a two-piece cardboard box composed of a lid part having an open bottom and a tray, the above configuration may be applied to the top surface of the lid part.

また、折目線１ａと折目線７ａ及び折目線２ａと折目線６ａがそれぞれ平行するものを例示したが、折目線１ａ，２ａ及び折目線７ａ，６ａは、そのいずれか又はいずれかの組み合わせがＶ字状に屈曲したり、緩やかに湾曲していてもよい。   Moreover, although the crease line 1a and the crease line 7a and the crease line 2a and the crease line 6a are illustrated in parallel, the crease lines 1a and 2a and the crease lines 7a and 6a are V or any combination thereof. It may be bent in a letter shape or gently curved.

１ 側板
２ 端板
３ 継代片
４，６ 内フラップ
５，７ 外フラップ
１ａ，２ａ，６ａ，７ａ 折目線
８，９ 面取り部
１０ 斜折線
１１ 側折線
２１，２２，２３ 切目線
２４，２５，２６ 押罫線
２７ 段潰弱め部
Ｂ ボトル DESCRIPTION OF SYMBOLS 1 Side plate 2 End plate 3 Passage piece 4,6 Inner flap 5,7 Outer flap 1a, 2a, 6a, 7a Folding line 8,9 Chamfer part 10 Diagonal line 11 Side folding line 21,22,23 Cut line 24,25, 26 Ruled Line 27 Step Crush Weakening Part B Bottle

Claims (4)

側板(1)及び端板(2)をそれぞれ対向させて角筒状の周壁を形成し、端板(2)及び側板(1)の上端からそれぞれ延びる内フラップ(6)及び外フラップ(7)を順次折り重ねて天面を閉止すると共に、内フラップ(6)及び外フラップ(7)の基部に、それぞれ端板(2)及び側板(1)との境界の折目線(2a,1a)から間隔をおいて折目線(6a,7a)を入れることにより、傾斜した面取り部(8,9)を形成し、段積み時の積上荷重による樽状の変形を防止する段ボール箱において、
前記内フラップ(6)の側端部には、面取り部(8)で基部側の角から斜め内側へ延びる斜折線(10)と、面取り部(8)より先端側で側端縁から間隔をおいて入れた側折線(11)とで区画される弱め加工を施した部分が設けられ、
前記内フラップ(6)の内側への折り曲げに伴い、内フラップ(6)の基部に面取部(8)が形成された状態で、外フラップ(7)を内側へ折り曲げることにより、内フラップ(6)の側端部の弱め加工を施した部分が外フラップ(7)の基部に押圧されて下方へ折れ曲がり、その折れ曲がり部分に重なるように外フラップ(7)が内側へ折り曲げられて、外フラップ(7)の基部の面取り部(9)が傾斜することを特徴とする胴膨れ防止段ボール箱。 An inner flap (6) and an outer flap (7) extending from the upper ends of the end plate (2) and the side plate (1), respectively, are formed by opposing the side plate (1) and the end plate (2) to form a square cylindrical peripheral wall. Are folded in order to close the top surface, and from the fold line (2a, 1a) at the boundary between the end plate (2) and the side plate (1) to the base of the inner flap (6) and the outer flap (7), respectively. In the corrugated cardboard box that forms the inclined chamfered portion (8, 9) by inserting the crease lines (6a, 7a) at intervals, and prevents the barrel-shaped deformation due to the loading load at the time of stacking,
The side end of the inner flap (6) has a beveled line (10) extending obliquely inward from the corner on the base side at the chamfered part (8), and a distance from the side edge on the tip side from the chamfered part (8). A part with weak processing that is divided by the side fold line (11) put in place is provided ,
As the inner flap (6) is bent inward, a chamfered portion (8) is formed at the base of the inner flap (6), and the outer flap (7) is bent inward to form the inner flap ( The weakened portion of the side edge of 6) is pressed by the base of the outer flap (7) and bent downward, and the outer flap (7) is bent inward so as to overlap the bent portion, and the outer flap A corrugated cardboard box, which is characterized in that the chamfered portion (9) of the base portion of (7) is inclined . 前記弱め加工として、全切りの切目がミシン目状に断続する切目線(21,22,23)又は半切りの切目線を入れたことを特徴とする請求項１に記載の胴膨れ防止段ボール箱。   The corrugated cardboard box according to claim 1, wherein as the weakening process, a cut line (21, 22, 23) or a half cut line is formed in which all cuts are intermittently formed in a perforation. . 前記弱め加工として、段ボールを線状に押し潰した押罫線(24,25,26)を入れたことを特徴とする請求項１に記載の胴膨れ防止段ボール箱。   The corrugated cardboard box according to claim 1, wherein a ruled line (24, 25, 26) obtained by crushing the cardboard into a line is inserted as the weakening process. 前記弱め加工として、内フラップの側端部の斜折線(10)と側折線(11)とで区画される部分に、段ボールの中芯を押し潰して段潰弱め部(27)を形成したことを特徴とする請求項１に記載の胴膨れ防止段ボール箱。   As the weakening process, the stepped weakening portion (27) was formed by crushing the core of the corrugated cardboard in the portion defined by the oblique fold line (10) and the side fold line (11) at the side end of the inner flap. A cardboard box for preventing swelling of the body according to claim 1.
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