JP4535566B2

JP4535566B2 - Packaging box

Info

Publication number: JP4535566B2
Application number: JP2000179409A
Authority: JP
Inventors: 亮介松島
Original assignee: Tomoku KK
Current assignee: Tomoku KK
Priority date: 2000-06-15
Filing date: 2000-06-15
Publication date: 2010-09-01
Anticipated expiration: 2020-06-15
Also published as: JP2002002684A

Description

【０００１】
【発明の属する技術分野】
本発明は、段ボール板紙によって形成される包装箱に関する。
【０００２】
【従来の技術】
従来、四枚の矩形状の側板及び接着片が折目線を介して一方向に連設され、各側板の両側に一対ずつフラップが連設された段ボール板紙を組立ててなる包装箱が知られている。この種の包装箱は、一般にラップアラウンドケースと言われ、何れか一つの前記側板を底板として被包装物を載置した後に、該被包装物を包み込むようにして各折目線に沿って各部を折り曲げ接着することによって組み立てられる。そしてこの種の包装箱は、極めて簡単に組み立てられ、組み立てと同時に被包装物の包装が行える構造であることから、一般に、自動機による組立包装作業が採用されている。
【０００３】
ところで、この種の包装箱においては、被包装物（例えば、家庭用洗剤等の商品）の販売時に該被包装物を展示するために、側板から天板にかけての一部を切除し開放して該被包装物を露出させることができるようになっているものが知られている。この場合には、例えば、側板と天板とに亘って連続して切除可能とするミシン目やジッパー等の切れ目状の破断可能線を大略環状に設け、該破断可能線に沿って破断することにより、側板から天板にかけての一部を切除して被包装物を露出させる展示用開放部を形成することが考えられる。このとき、該破断可能線を側板及び天板の外周縁から離間させて設けることによって、展示用開放部を開放させたときに該展示用開放部の外周に側板及び天板の残部が張り出すので、露出する被包装物の脱落を防止して包装箱内に収められた状態を維持することができる。
【０００４】
しかし、側板と天板とに亘って連続する環状の破断可能線を設けると、該破断可能線の一部が左右方向に側板を横断する。このため、複数の包装箱を上下に積み重ねた際に該側板に対してその上下方向に圧縮荷重がかかると、破断可能線の該側板の左右方向に横断する部分に荷重が集中し、当該位置の破断可能線が不用意に破断されてしまうおそれがある。
【０００５】
そこで、前記破断可能線のうち側板を左右方向に横断する位置においては、該破断可能線に替えて側板内面にカットテープ等の破断補助材を貼着しておくことによって側板の耐圧強度を向上させることが行なわれている。
【０００６】
しかし、この構成によると、前記展示用開放部を開放するためには、前記破断可能線の切断作業に加えて前記破断補助材による側板の切断作業を行なわなければならず、展示用開放部の開放作業が煩わしい不都合がある。また、カットテープ等の破断補助材による破断後の切り口は外観が極めて悪く、被包装物の展示には不適である。更に、前記段ボール板紙の製造時にカットテープの貼着工程が必要であるため製造コストが増加する不都合がある。
【０００７】
【発明が解決しようとする課題】
かかる不都合を解消して、本発明は、胴部の一部を切除して被包装物を展示可能としても、コストを増加させることなく十分な耐圧強度を得ることができ、しかも、被包装物の展示に際して展示用開放部の開放作業を容易とすることができる包装箱を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明の包装箱は、段ボール板紙によって形成されている。本発明の包装箱が該段ボール板紙から組立てられるときには、先ず、該段ボール板紙の一端から他端に向かって一方向に連なる第１側板、天板、第２側板、底板及び接着片が、各板の境界に沿って設けられた折目線を介して互いに直角に折り曲げられ、次いで、前記接着片が、前記第１側板の内面に接着剤を介して接着されて四角筒状の胴部が形成される。
【０００９】
そして、前記天板及び底板の夫々の両側端縁に折目線を介して連設された一対の内フラップが、夫々の折目線に沿って内方に向かって直角に折り曲げられ、その後、前記第１及び第２側板の夫々の両側端縁に折目線を介して連設された一対の外フラップが、夫々の折目線に沿って内方に向かって直角に折り曲げて各内フラップの外面に重合される。このとき、各内フラップと各外フラップとは接着剤を介して接着され、前記胴部が閉塞される。
【００１０】
本発明の包装箱においては、前記の目的を達成するために、前記天板及び第１側板にかけての胴部の一部を破断可能線に沿って切除することにより該胴部内に収納された被包装物を露出させて展示可能とする展示用開放部を設け、前記破断可能線を、前記第１側板の一側方寄りの下端縁から天板に向かって延び、天板を大略逆Ｕ字状に横断し、更に該第１側板の下方に向って延びて該第１側板の他側方寄りの下端縁に至るまで設け、前記内フラップの両側に、一対の他の破断可能線を介して破断分離可能とされた破断分離部を設け、前記外フラップを前記内フラップの外面に重合させるとき、該内フラップの各破断分離部の外面に前記接着剤を塗布して前記外フラップを接着したことを特徴とする。
【００１１】
前記破断可能線は、その一端と他端とが夫々前記第１側板の下端縁に至って設けられているので、該破断可能線の一部を前記第１側板の左右方向に横断させることなく展示用開放部を設けることができる。これにより、複数の包装箱を積み重ねた際に第１側板に上方からの圧縮荷重がかかっても、該破断可能線の不用意な破断を防止することができ、第１側板の耐圧強度を十分に維持して前記展示開放部を設けることができる。
【００１２】
更に、前記破断可能線は、第１側板から天板に亘って形成されているので、前記展示用開放部を開放させるときには、該天板の一部を大略逆Ｕ字状の破断可能線に沿って破断遊離させた後に連続して第１側板の一部を引き下げるようにして該破断可能線を破断させれば、一挙動で容易に展示用開放部を開放させることができる。
【００１３】
また、本発明において、前記接着片は、少なくとも前記破断可能線に沿って切除した際に前記第１側板の両側に形成される残部との重合位置において接着され、該破断可能線の両端部間との重合位置においては、前記展示用開放部が開放されることにより露出して前記第１側板の残部に連続する枠部を形成することを特徴とする。
【００１４】
前記破断可能線に沿って胴部の一部を切除したときには、前記底板に沿って起立する接着片の一部が露出して前記枠部が形成される。これによって、前記破断可能線が切断されて前記第１側板が左右に分断されても、その下縁側に露出した接着片による該枠部によって、展示状態で露出された被包装物の脱落を防止することができる。また、前記接着片には、前記破断可能線に沿って破断されたときの切り口が存在しないので、展示用開放部の下縁の枠部端縁の外観を切り口によって低下させることなく、被包装物の展示に好適な展示用開放部を形成することができる。
【００１５】
【発明の実施の形態】
本発明の一実施形態を図面に基づいて説明する。図１は本実施形態の包装箱の説明的斜視図、図２は図１示の包装箱の展開図、図３は展示用開放部の開放作業を示す説明図、図４（ａ）は開封後の折り畳み状態を示す説明図、図４（ｂ）は開封後の展開状態を示す説明図である。
【００１６】
図１に示す本実施形態の包装箱１は、図２に示すように、大略矩形状の段ボール板紙２を組み立てることによって形成される。該板紙２は、夫々折目線ａ，ｂ，ｃを介して一方向に連設された第１側板３、天板４、第２側板５、及び底板６を備えている。また、第１側板３と第２側板５との夫々の上下端縁には、折目線ｄ，ｄ，ｅ，ｅを介して外フラップ７，７，８，８が連設され、天板４と底板６との夫々の上下端縁には、折目線ｆ，ｆ，ｇ，ｇを介して内フラップ９，９，１０，１０が連設されている。更に、底板６の右側縁には折目線ｈを介して接着片１１が連設されている。
【００１７】
前記外フラップ７，７，８，８の先端の略中央部には、一対の切れ目ｉ，ｉと両切れ目ｉ，ｉ間を繋ぐ折目線（又は切目線）ｊとにより手指差込部１２が形成されている。前記内フラップ９，９，１０，１０の両側には、一対の破断可能線ｋ，ｋを介して破断分離可能とされた破断分離部１３，１３が形成されている。
【００１８】
また、前記天板４から第１側板３にかけて破断可能線ｍが設けられており、該破断可能線ｍに包囲された切除可能部（後述の切離片１４ｂ）を切除することによって後述の展示用開放部１４が形成できるようになっている。該破断可能線ｍは天板４側に破断開始部１４ａを備え、該破断開始部１４ａは折目線（又は切目線）ｐを介して折り曲げ自在（或いは破断自在）に設けられている。
【００１９】
更に、該破断可能線ｍに沿って破断すると、展示用開放部１４の周囲において天板４及び第１側板３の両側の一部が額縁状に残余する残部３ａ，４ａ（図３参照）が形成される。該破断可能線ｍは、図１及び図２に示すように、その両端が第１側板３の端縁まで延びている。また、該破断可能線ｍは、残部３ａ，４ａにおける両側板３，４の境界の折目線ａに沿って該折目線ａの破断を案内するための大略Ｖ字状の切込み１５（図４参照）を該展示開放部１４の内縁に形成する切込み形成部ｎを備えている。
【００２０】
以上のように形成された段ボール板紙２から図１示の包装箱１を組み立てる場合には、図示しない自動機械によって行われる。即ち、先ず、前記底板６上に図示しない被包装物（例えば、シャンプーや詰め替え用洗剤等）を載置し、該被包装物を包むようにして第２側板５、天板４、及び第１側板３を夫々折目線ｃ，ｂ，ａを介して直角に折り曲げる。次いで、接着片１１を折目線ｈを介して折曲げ、第１側板３の内面に重合させて接着剤ｗを介して接着する。これによって、四角筒状の胴部１６（図１示）が形成される。このとき、接着剤ｗは、主に接着片１１の両側において強固な接着力が得られるように、図１に示すように、第１側板３の残部３ａに対応する位置において比較的多量に塗布される。一方、接着片１１の中央部分、即ち、第１側板３の両側寄りの破断可能線ｍ，ｍ間（枠部形成部１１ａ）は展示開放部１４の形成を阻害しない程度に比較的弱い接着力で接着されていることが好ましい。なお、該枠部形成部１１ａにおいて比較的弱く接着することで、後述する切離片４ｂを剥がし易く且つ加重によって破断可能線ｍの不用意な切断が確実に防止されるが、よりコストを低減させるために、該枠部形成部１１ａにおいて非接着としてもよい。
【００２１】
そして、該胴部１６の開放された両側において、内フラップ９，９，１０，１０を折目線ｆ，ｆ，ｇ，ｇに沿って内方に折り曲げ、外フラップ７，７，８，８を折目線ｄ，ｄ，ｅ，ｅに沿って折り曲げて内フラップ９，９，１０，１０の外面に重合させる。このとき、図１に示すように、内フラップ９，９，１０，１０の各破断分離部１３の外面に接着剤ｘを塗布して外フラップ７，７，８，８を接着する。このように、内フラップ９，９，１０，１０と外フラップ７，７，８，８との封止によって胴部１６の両側が閉塞され、該包装箱１の組立て完了と同時に該包装箱１内部への被包装物の包装が完了する。
【００２２】
このようにして形成された包装箱１は、前記破断可能線ｍが胴部１６に設けられていても、該破断可能線ｍの一部が第１側板３を左右方向に横断していないので、耐圧強度を十分に得ることができる。
【００２３】
ここで、本実施形態の包装箱１において、耐圧強度の試験を行なったところ、平均５４９kg（水分8.7％）の十分な強度が得られた。そして、図示しないが、破断可能線ｍの下端部を第１側板３の下縁より高い位置で左右方向に横断させた他の包装箱（具体的には、第１側板３から天板４にかけて環状に破断可能線ｍが設けられたもの）について耐圧強度を測定したところ、該包装箱は平均４５１kg（水分8.6％）の強度を示し、該包装箱に比して本実施形態の包装箱１が約１００kgの強度向上を実現していることが明らかとなった。
【００２４】
また、店舗等において被包装物の展示販売をする際には、先ず、図３（ａ）に示すように、天板４に設けられた破断可能線ｍの破断開始部１４ａに手指を差し込み、該破断可能線ｍに沿って切離片１４ｂの一部を遊離させて天板４を開放させる。
【００２５】
続いて、天板４から遊離した切離片１４ｂを下方に向かって引き下げることにより、図３（ｂ）に示すように、一挙に切離片１４ｂを切除する。こうすることによって、胴部１６の一部に展示用開放部１４が形成される。該展示用開放部１４が形成されることによって、被包装物を露出させることができ、該被包装物を展示し且つ取り出すことができる。このとき、前記接着片１１の枠部形成部１１ａが露出して、前記残部３ａ，４ａに連続する額縁状の枠部とされ、被包装物の脱落が防止される。
【００２６】
次に、被包装物が取り出された包装箱１を廃棄或いはリサイクル処理のために扁平にするときには、図１を参照して、外フラップ７，８の手指差込部１２に手指を挿入して外フラップ７，８を外方に引き開く。これにより、接着剤ｘを介して外フラップ７，８に接着された内フラップ９，１０の破断分離部１３が破断可能線ｋを介して内フラップ９，１０から分離し、胴部１６の両側が開放される。
【００２７】
そして、この状態から図４（ａ）に示すように、扁平に折りたたむことができる。また、前記切込み１５の案内により残部４ａと５ａとの境界の折目線ｂを引き裂くことにより、図４（ｂ）に示すように、極めて容易且つ迅速に展開状態とすることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態の包装箱の説明的斜視図。
【図２】図１示の包装箱の展開図。
【図３】展示用開放部の開放作業を示す説明図。
【図４】（ａ）は開封後の折り畳み状態を示す説明図、（ｂ）は開封後の展開状態を示す説明図。
【符号の説明】
１…包装箱、２…段ボール板紙、３…第１側板、４…天板、３ａ，４ａ…残部、５…第２側板、６…底板、７，８…外フラップ、９，１０…内フラップ、１１…接着片、１１ａ…枠部形成部（枠部）、１３…破断分離部、１４…展示用開放部、ｍ…破断可能線、１６…胴部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging box formed of corrugated paperboard.
[0002]
[Prior art]
Conventionally, there is known a packaging box in which four rectangular side plates and adhesive pieces are continuously connected in one direction through a crease line, and a pair of flaps are continuously connected to both sides of each side plate. Yes. This type of packaging box is generally referred to as a wrap-around case, and after placing an article to be packaged using any one of the side plates as a bottom plate, each part along each fold line is wrapped around the article to be wrapped. It is assembled by bending and bonding. Since this type of packaging box is structured so that it can be assembled very easily and the package can be packaged simultaneously with the assembly, an assembly packaging operation by an automatic machine is generally employed.
[0003]
By the way, in this type of packaging box, a part from the side plate to the top plate is cut off and opened in order to display the packaged item (for example, a product such as household detergent) at the time of sale. There are known ones that can expose the package. In this case, for example, a breakable breakable line such as a perforation or a zipper that can be continuously cut across the side plate and the top plate is provided in a substantially annular shape, and the breakable line is broken along the breakable line. Thus, it is conceivable that a part from the side plate to the top plate is cut out to form an opening for exhibition that exposes the packaged items. At this time, by providing the breakable line apart from the outer peripheral edges of the side plate and the top plate, when the display opening portion is opened, the remaining portions of the side plate and the top plate project on the outer periphery of the display opening portion. Therefore, it is possible to prevent the exposed packaged item from falling off and maintain the state of being stored in the packaging box.
[0004]
However, when an annular breakable line that is continuous across the side plate and the top plate is provided, a part of the breakable line crosses the side plate in the left-right direction. For this reason, when a plurality of packaging boxes are stacked vertically, if a compressive load is applied to the side plate in the vertical direction, the load concentrates on the portion of the breakable line that crosses the side plate in the left-right direction, and the position The breakable line may be broken carelessly.
[0005]
Therefore, at the position of the breakable wire that crosses the side plate in the left-right direction, the pressure resistance of the side plate is improved by attaching a breakage aid such as a cut tape to the inner surface of the side plate instead of the breakable wire. Has been done.
[0006]
However, according to this configuration, in order to open the exhibition opening portion, in addition to the breakable line cutting operation, the side plate must be cut by the breakage assisting material. There is an inconvenience that the opening work is troublesome. In addition, the cut surface after breakage by a breakage aid such as a cut tape has a very bad appearance, and is not suitable for display of an article to be packaged. Furthermore, there is a disadvantage in that the manufacturing cost increases because a step of attaching a cut tape is necessary when manufacturing the corrugated paperboard.
[0007]
[Problems to be solved by the invention]
In order to eliminate such inconvenience, the present invention can obtain a sufficient pressure-resistant strength without increasing the cost even if a part of the body portion is cut out and the packaged object can be displayed. It is an object of the present invention to provide a packaging box that can facilitate the opening operation of the opening part for exhibition.
[0008]
[Means for Solving the Problems]
The packaging box of the present invention is formed of corrugated paperboard. When the packaging box of the present invention is assembled from the corrugated paperboard, first, the first side plate, the top plate, the second side plate, the bottom plate, and the adhesive piece that are continuous in one direction from one end to the other end of the corrugated paperboard Are bent at right angles to each other through a crease line provided along the boundary of the first side plate, and then the adhesive piece is bonded to the inner surface of the first side plate with an adhesive to form a square cylindrical body. The
[0009]
Then, a pair of inner flaps connected to both side edges of the top plate and the bottom plate via a crease line is bent at a right angle inward along each crease line, and then the first plate A pair of outer flaps connected to each side edge of each of the first and second side plates via a crease line is bent at a right angle inward along each crease line and overlapped on the outer surface of each inner flap. Is done. At this time, each inner flap and each outer flap are bonded via an adhesive, and the body portion is closed.
[0010]
In the packaging box of the present invention, in order to achieve the above-mentioned object, a part of the body part extending to the top plate and the first side plate is cut out along the breakable line so as to be stored in the body part. An open part for display that allows the display of the package to be exposed is provided, and the breakable line extends from the lower edge of one side of the first side plate toward the top plate, and the top plate is substantially inverted U-shaped. And extending downward toward the lower side of the first side plate to reach the lower edge of the first side plate, and a pair of other breakable lines are provided on both sides of the inner flap. When the outer flap is polymerized on the outer surface of the inner flap, the adhesive is applied to the outer surface of each of the inner flaps to bond the outer flap. characterized in that it was.
[0011]
Since the breakable line has one end and the other end reaching the lower edge of the first side plate, the breakable line is displayed without traversing a part of the breakable line in the left-right direction of the first side plate. An opening can be provided. Thereby, even when a compression load from above is applied to the first side plate when a plurality of packaging boxes are stacked, it is possible to prevent inadvertent breakage of the breakable wire, and the pressure strength of the first side plate is sufficient. The exhibition opening part can be provided while maintaining the above.
[0012]
Further, since the breakable line is formed from the first side plate to the top plate, when the exhibition opening portion is opened, a part of the top plate is changed to a substantially reverse U-shaped breakable line. If the breakable line is broken by continuously pulling down a part of the first side plate and then breaking the breakable line, the display opening can be easily opened in one behavior.
[0013]
Further, in the present invention, the adhesive piece is bonded at a polymerization position with a remaining portion formed on both sides of the first side plate when cut along at least the breakable line, and between the both ends of the breakable line. In the overlapping position, a frame portion that is exposed by opening the exhibition opening portion and is continuous with the remaining portion of the first side plate is formed.
[0014]
When a part of the body portion is cut along the breakable line, a part of the adhesive piece standing along the bottom plate is exposed to form the frame portion. Thereby, even if the breakable line is cut and the first side plate is divided into left and right, the frame portion by the adhesive piece exposed on the lower edge side prevents the packaged items exposed in the display state from falling off. can do. Further, since there is no cut when the adhesive piece is broken along the breakable line, the appearance of the frame edge of the lower edge of the opening for display is not reduced by the cut, and the package is wrapped. An exhibition opening suitable for exhibiting objects can be formed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory perspective view of the packaging box of the present embodiment, FIG. 2 is a development view of the packaging box shown in FIG. 1, FIG. 3 is an explanatory view showing the opening operation of the exhibition opening, and FIG. FIG. 4B is an explanatory view showing the rear folded state, and FIG. 4B is an explanatory view showing the unfolded state after opening.
[0016]
The packaging box 1 of this embodiment shown in FIG. 1 is formed by assembling a substantially rectangular corrugated paperboard 2 as shown in FIG. The paperboard 2 includes a first side plate 3, a top plate 4, a second side plate 5, and a bottom plate 6 that are continuously provided in one direction via fold lines a, b, and c, respectively. Further, outer flaps 7, 7, 8, and 8 are connected to upper and lower edges of the first side plate 3 and the second side plate 5 via crease lines d, d, e, and e, respectively. Inner flaps 9, 9, 10, and 10 are connected to upper and lower edges of the base plate 6 and the bottom plate 6 via fold lines f, f, g, and g, respectively. Further, an adhesive piece 11 is connected to the right edge of the bottom plate 6 via a crease line h.
[0017]
A finger insertion portion 12 is formed at a substantially central portion at the tip of the outer flaps 7, 7, 8, 8 by a pair of cut lines i, i and a crease line (or cut line) j connecting the two cut lines i, i. Is formed. On both sides of the inner flaps 9, 9, 10, and 10, there are formed break separating portions 13 and 13 that can be broken and separated through a pair of breakable lines k and k.
[0018]
Further, a breakable line m is provided from the top plate 4 to the first side plate 3, and an exhibit described later is performed by excising the excisable part (discrete piece 14b described later) surrounded by the breakable line m. An open portion 14 can be formed. The breakable line m includes a break start portion 14a on the top plate 4 side, and the break start portion 14a is provided to be foldable (or breakable) via a crease line (or cut line) p.
[0019]
Furthermore, when it breaks along the breakable line m, there are remaining portions 3a, 4a (see FIG. 3) in which a part of both sides of the top plate 4 and the first side plate 3 remains in a frame shape around the opening portion 14 for display. It is formed. As shown in FIGS. 1 and 2, the breakable line m extends to both ends of the first side plate 3. Further, the breakable line m is a substantially V-shaped cut 15 for guiding breakage of the crease line a along the crease line a of the boundary between the side plates 3 and 4 in the remaining portions 3a and 4a (see FIG. 4). ) At the inner edge of the exhibition opening 14.
[0020]
When assembling the packaging box 1 shown in FIG. 1 from the corrugated paperboard 2 formed as described above, it is performed by an automatic machine (not shown). That is, first, an object (not shown) such as a shampoo or a refill detergent is placed on the bottom plate 6 and the second side plate 5, the top plate 4, and the first side plate 3 are wrapped around the object to be packaged. Are bent at right angles through the crease lines c, b and a, respectively. Next, the adhesive piece 11 is bent through the crease line h, polymerized on the inner surface of the first side plate 3, and bonded through the adhesive w. As a result, a rectangular tubular body 16 (shown in FIG. 1) is formed. At this time, the adhesive w is applied in a relatively large amount at a position corresponding to the remaining portion 3a of the first side plate 3 as shown in FIG. 1 so that a strong adhesive force can be obtained mainly on both sides of the adhesive piece 11. Is done. On the other hand, the adhesive portion 11 has a relatively weak adhesive strength to the extent that the central portion of the adhesive piece 11, that is, between the breakable lines m and m near both sides of the first side plate 3 (frame portion forming portion 11 a) is not hindered from forming the exhibition opening portion 14. It is preferable that they are bonded together. In addition, by relatively weakly adhering at the frame portion forming portion 11a, it is easy to peel off a separation piece 4b described later, and the breakable line m is prevented from being carelessly cut by the load, but the cost is further reduced. Therefore, the frame portion forming portion 11a may be non-adhered.
[0021]
The inner flaps 9, 9, 10, and 10 are folded inward along the crease lines f, f, g, and g on both sides of the body 16 that are opened, and the outer flaps 7, 7, 8, and 8 are folded. It is bent along the crease lines d, d, e, and e to be superposed on the outer surfaces of the inner flaps 9, 9, 10, and 10. At this time, as shown in FIG. 1, the outer flaps 7, 7, 8, 8 are bonded by applying an adhesive x to the outer surfaces of the fracture separation portions 13 of the inner flaps 9, 9, 10, 10. In this way, both sides of the body portion 16 are closed by sealing the inner flaps 9, 9, 10, 10 and the outer flaps 7, 7, 8, 8, and simultaneously with the completion of the assembly of the packaging box 1, the packaging box 1 Packaging of the packaged items inside is completed.
[0022]
In the packaging box 1 formed in this way, even if the breakable line m is provided in the body portion 16, a part of the breakable line m does not cross the first side plate 3 in the left-right direction. The pressure strength can be sufficiently obtained.
[0023]
Here, in the packaging box 1 of the present embodiment, when a pressure strength test was performed, a sufficient strength of an average of 549 kg (moisture 8.7%) was obtained. And although not shown in figure, it is the other packaging box (specifically from the 1st side plate 3 to the top plate 4) which crossed the lower end part of the breakable line m in the left-right direction in the position higher than the lower edge of the 1st side plate 3. When the compressive strength was measured for a ring having a breakable line m), the packaging box showed an average strength of 451 kg (moisture 8.6%), and the packaging box 1 of the present embodiment compared to the packaging box. It has become clear that an improvement in strength of about 100 kg has been realized.
[0024]
In addition, when displaying and selling a packaged item in a store or the like, first, as shown in FIG. 3 (a), a finger is inserted into the breaking start portion 14a of the breakable line m provided on the top plate 4, A part of the cut piece 14b is released along the breakable line m, and the top plate 4 is opened.
[0025]
Subsequently, the cut piece 14b released from the top plate 4 is pulled downward to cut away the cut piece 14b at a stroke as shown in FIG. 3B. By doing so, the exhibition opening portion 14 is formed in a part of the trunk portion 16. By forming the display opening 14, the packaged object can be exposed, and the packaged object can be displayed and taken out. At this time, the frame portion forming portion 11a of the adhesive piece 11 is exposed to form a frame-shaped frame portion continuous with the remaining portions 3a and 4a, and the fall off of the package object is prevented.
[0026]
Next, when flattening the packaging box 1 from which the package is taken out for disposal or recycling, refer to FIG. 1 and insert the fingers into the finger insertion portions 12 of the outer flaps 7 and 8. Pull the outer flaps 7 and 8 outward. Thereby, the breaking separation part 13 of the inner flaps 9 and 10 bonded to the outer flaps 7 and 8 via the adhesive x is separated from the inner flaps 9 and 10 via the breakable line k, and both sides of the body part 16 are separated. Is released.
[0027]
And from this state, as shown to Fig.4 (a), it can fold flat. Further, by tearing the crease line b at the boundary between the remaining portions 4a and 5a by the guide of the notch 15, as shown in FIG. 4 (b), the unfolded state can be made extremely easily and quickly.
[Brief description of the drawings]
FIG. 1 is an explanatory perspective view of a packaging box according to an embodiment of the present invention.
2 is a development view of the packaging box shown in FIG. 1. FIG.
FIG. 3 is an explanatory view showing an opening operation of an exhibition opening part.
4A is an explanatory view showing a folded state after opening, and FIG. 4B is an explanatory view showing an unfolded state after opening.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Packaging box, 2 ... Corrugated paperboard, 3 ... 1st side plate, 4 ... Top plate, 3a, 4a ... Remaining part, 5 ... 2nd side plate, 6 ... Bottom plate, 7,8 ... Outer flap, 9,10 ... Inner flap DESCRIPTION OF SYMBOLS 11 ... Adhesive piece, 11a ... Frame part formation part (frame part), 13 ... Breaking separation part, 14 ... Opening part for display, m ... Breakable line, 16 ... Trunk part.

Claims

A crease line formed by corrugated paperboard, and provided with a first side plate, a top plate, a second side plate, a bottom plate, and an adhesive piece that extend in one direction from one end to the other end of the corrugated paperboard along the boundary of each plate Are bent at right angles to each other, and the adhesive piece is bonded to the inner surface of the first side plate with an adhesive to form a square cylindrical body, and the top plate and the bottom plate are respectively attached to both side edges. A pair of inner flaps arranged continuously through the crease line is bent at a right angle inward along the respective crease lines, and the both side edges of the first and second side plates are folded through the crease lines. A pair of consecutive outer flaps are folded inward at right angles along the respective crease lines and polymerized on the outer surface of each inner flap, and each inner flap and each outer flap are bonded via an adhesive. In the packaging box formed by closing the body part,
By providing a display opening portion that allows the display of the articles to be packaged stored in the body portion by cutting a part of the body portion along the breakable line by cutting the top plate and the first side plate along the breakable line,
The breakable line extends from a lower end edge near one side of the first side plate toward the top plate, traverses the top plate in a substantially inverted U shape, and further extends downward from the first side plate. Provided to reach the lower edge of the first side plate toward the other side ,
Provided on both sides of the inner flap with a break separating portion that can be broken and separated through a pair of other breakable lines,
A packaging box , wherein when the outer flap is superposed on the outer surface of the inner flap, the adhesive is applied to the outer surface of each fracture separation portion of the inner flap to bond the outer flap .

The adhesive piece is bonded at the overlapping position with the remaining portions formed on both sides of the first side plate when cut along at least the breakable line, and at the overlapping position between both ends of the breakable line. The packaging box according to claim 1, wherein a frame portion that is exposed by opening the exhibition opening portion and is continuous with the remaining portion of the first side plate is formed.