JP4287112B2

JP4287112B2 - Paper tray

Info

Publication number: JP4287112B2
Application number: JP2002262405A
Authority: JP
Inventors: 隆亮辻本
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2002-09-09
Filing date: 2002-09-09
Publication date: 2009-07-01
Anticipated expiration: 2022-09-09
Also published as: JP2004099088A

Description

【０００１】
【発明の属する技術分野】
本発明は、食品などを充填した後に蓋体で熱接着して封緘するフランジ部を有する紙トレーに関し、さらに詳しくは、一枚のブランク板から成形機により自動的に成形されるフランジ部とウエッブコーナー部とを有するテーパー付きの紙トレーに関するものである。
【０００２】
【従来の技術】
従来、この種の紙トレーは、一方の面に熱接着性樹脂層を有する紙器用紙からなる一枚のブランク板、たとえば、図３に示すような矩形状底壁２０の四方の端縁に折罫２３、２４を介して側壁３０、４０を設け、隣り合う側壁３０、４０の側端縁の間に両側端縁に折罫３４を介して連結すると共に折罫７１を介して折畳み自在に隣接する折込板７０ａ、７０ｂを有する折込接合壁７０を設け、前記側壁３０、４０および前記折込板７０ａの外縁に折罫３５と折罫４６および折罫７８を介して両端に突出片αを有するフランジ板５０と両端に突出片βを有するフランジ板６０およびフランジ接合片８０を設けた一方の面に熱接着性樹脂層を有する紙器用紙からなるブランク板１０’を前記熱接着性樹脂層が上側に位置するように雌型（図示せず）上に載置すると共に前記雌型（図示せず）に装備された加熱装置（図示せず）により予め前記ブランク板１０’の所定個所（前記折込接合壁７０と前記フランジ接合片８０と前記突出片α、β）を加熱し、横断面略Ｉ字状の雄型（図５参照）を前記ブランク板１０’上から前記雌型（図示せず）内に挿入することにより前記雄型（図５参照）と前記雌型（図示せず）とが協働して、前記ブランク板１０’の前記熱接着性樹脂層が内面側となるように前記折罫２３、２４を内面側に谷折りして前記側壁３０、４０を立ち上げると共に前記折罫７１を内面側に谷折りして前記折込板７０ａ、７０ｂを重ね合わせた前記折込接合壁７０を形成し、前記フランジ板５０の前記端部αが前記フランジ板６０の前記端部βの下側（外面側）に位置するように、また、前記折込接合壁７０を前記側壁４０側に折り曲げて前記フランジ接合片８０が前記フランジ板６０の下側（外面側）に位置するように重ね合わせ、重ね合わせた個所を熱接着した図４に示すような紙トレー１０が得られる。図４上、斜線で示した個所が上記した重ね合わせて熱接着した個所である。この種の紙トレーは、たとえば、スプリンター社製のＭＰ−ＨＴタイプなどの成形機を用いて凡そ１５０個／分の能力で生産される。
【０００３】
しかしながら、上記したスプリンター社製の成形機は、ほぼ図４に示す紙トレー１０の完成状態となった成形の最終段階〔図５（ａ）参照〕で、図５（ｂ）に示すように紙トレー１０内に横断面略Ｉ字状の雄型１００が挿入された状態で雌型（図示せず）の断面凸形状の金型側壁２００が前記雄型１００に係合した状態で、かつ、前記フランジ板５０（図示せず）の前記端部αが前記フランジ板６０の前記端部β（図示せず）の下側（外面側）に位置するように、また、前記折込接合壁７０を前記側壁４０側に折り曲げて前記フランジ接合片８０が前記フランジ板６０の下側（外面側）に位置するように重ね合わせ、重ね合わせた個所を熱接着した前記折込接合壁７０を有する前記側壁４０側が雌型で支持されないフリーな状態となる。この最終段階において、前記フランジ板５０の略中央部は前記雌型（図示せず）の断面凸形状の金型側壁２００で前記雄型１００に密着する方向〔図５（ａ）上、矢印Ｍで示す方向〕に圧されると共に前記フランジ５０の両端部は雄型１００により下方〔図５（ａ）上、矢印Ｄで示す方向〕に圧されるために、前記フランジ板５０の両端部に応力（紙の腰による反発力）が生じて未だ冷却固着する前の仮着状態にある熱接着した個所〔図５（ａ）上、斜線で示した個所〕がズレる、あるいは、剥離するために、所定形状に成形できずに歪な形状の紙トレーになる虞があるといった問題や容器形状の体裁をもたない紙トレーになる虞があるといった問題があった（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開２００１−３２２６７６号公報
【０００５】
【発明が解決しようとする課題】
そこで本発明は、上記問題に鑑みてなされたものであって、歪な形状になることがなく、容器形状の体裁を損なうことがない紙トレーを提供することである。
【０００６】
【課題を解決するための手段】
本発明者は、上記課題を達成するために、請求項１記載の本発明の紙トレー１は、矩形状底壁２０の四方の端縁に折罫２３、２４を介して側壁３０、４０を設け、隣り合う側壁３０、４０の側端縁の間に両側端縁に折罫３４を介して連結すると共に折罫７１を介して折畳み自在に隣接する折込板７０ａ、７０ｂを有する折込接合壁７０を設け、前記側壁３０、４０および前記折込板７０ａの外縁に折罫３５と折罫４６および折罫７８を介して両端に突出片αを有するフランジ板５０と両端に突出片βを有するフランジ板６０およびフランジ接合片８０を設けた少なくとも一方の面に熱接着性樹脂層を有する紙器用紙の前記フランジ板５０の両端に位置する前記突出片α側に前記折罫３５近傍から互いに接近するように前記フランジ板５０の外縁側近傍に延びる切線Ｓを設けたブランク板１’を、前記熱接着性樹脂層を内面として前記折罫２３、２４を内面側に谷折りして前記側壁３０、４０を立ち上げると共に前記折罫７１を内面側に谷折りして前記折込板７０ａ、７０ｂを重ね合わせた前記折込接合壁７０を形成し、さらに前記フランジ板５０の前記端部αが前記フランジ板６０の前記端部βの外面側に位置するように、また、前記折込接合壁７０を前記側壁４０側に折り曲げて前記フランジ接合片８０が前記フランジ板６０の外面側に位置するように重ね合わせ、重ね合わせた箇所を熱接着すると共に前記折罫３５、４６、７８を山折りして前記フランジ板５０、６０および前記フランジ接合片８０とからなるフランジ部Ｆを形成した紙トレー１であって、前記フランジ板５０の前記紙トレー１としたときの外面を構成する側に前記切線Ｓが形成されており、かつ、前記切線Ｓが半切線であることを特徴とするものである。
【０００７】
上記請求項１に記載するように前記フランジ板５０の両端に位置する前記突出片α側の前記フランジ板５０に切線Ｓを設けた構成とすることにより、たとえば、スプリンター社製ＭＰ−ＨＴタイプの成形機を用いて紙トレーを成形しても、従来技術の項で説明した成形の最終段階において、図５に示すように前記フランジ板５０の略中央部が前記雌型（図示せず）の断面凸形状の側壁２００で前記雄型１００に密着する方向〔図５（ａ）上、矢印Ｍで示す方向〕に圧されると共に前記フランジ板５０の両端部は雄型１００により下方〔図５（ａ）上、矢印Ｄで示す方向〕に圧されたとしても、前記切線Ｓで前記フランジ板５０の紙の腰が縁切りにされるために前記フランジ板５０の両端部にかかる応力（紙の腰による反発力）が小さくなるために未だ冷却固着する前の仮着状態にある熱接着した個所〔図５（ａ）上、斜線で示した個所〕がズレたり、あるいは、剥離したりすることがなく、所定形状の体裁のよい紙トレーを得ることができる。
【０００８】
【発明の実施の形態】
上記の本発明について、図面等を用いて以下に詳述する。
図１は本発明にかかる紙トレーの一実施例を示す（ａ）は収納部側から見た斜視図、（ｂ）は底面側から見た斜視図、図２は底面側から見た図１のブランク板の平面図であり、図中の１は紙トレー、１’はブランク板、２０は底壁、３０，４０は側壁、７０は折込接合壁、７０ａ，７０ｂは折込板、５０，６０はフランジ板、８０はフランジ接合片、２３，２４，３４、３５，４６，７８は折罫、１００は成形機の雄型、２００は成形機の雌型の金型側壁、α，βはフランジ板の端部、Ｓは直線状半切線、Ｆはフランジ部をそれぞれ示す。
【０００９】
図１は本発明にかかる紙トレーの一実施例を示す（ａ）は収納部側から見た斜視図、（ｂ）は底面側から見た斜視図、図２は図１の図１（ｂ）側から見た展開図であって、紙トレー１は、２４０〜４００ｇ／ｍ²程度の紙器用紙の少なくとも一方の面（容器としたときに内容物が収納される側の面）全面に２０〜６０μｍ厚さのポリエチレン、ポリプロピレンなどのオレフィン系樹脂等からなる熱接着性樹脂層を設けた層構成の原紙を用い、図２に示すように矩形状底壁２０の四方の端縁に折罫２３、２４を介して側壁３０、４０を設け、隣り合う側壁３０、４０の側端縁の間に両側端縁に折罫３４を介して連結すると共に折罫７１を介して折畳み自在に隣接する折込板７０ａ、７０ｂを有する折込接合壁７０を設け、前記側壁３０、４０および前記折込板７０ａの外縁に折罫３５と折罫４６および折罫７８を介して両端に突出片αを有するフランジ板５０と両端に突出片βを有するフランジ板６０およびフランジ接合片８０を設けた前記原紙の他方の面（後述する紙トレー１としたときの外面側）の前記フランジ板５０に、前記フランジ板５０の両端に位置する前記突出片α側の前記折罫３５近傍から互いに接近するように前記フランジ板５０の外縁側近傍に延びる直線状半切線Ｓを設けたブランク板１’を製函することにより得ることができる。
【００１０】
上記のように構成されたブランク板１’の製函は、実際にはスプリンター社製ＭＰ−ＨＴタイプの成形機を用いて自動製函されるが、具体的に説明すると、前記ブランク板１’の前記熱接着性樹脂層を内面として前記折罫２３、２４を内面側に谷折りして前記側壁３０、４０を立ち上げると共に前記折罫７１を内面側に谷折りして前記折込板７０ａ、７０ｂを重ね合わせた前記折込接合壁７０を形成し、さらに前記フランジ板５０の前記端部αが前記フランジ板６０の前記端部βの外面側に位置するように、また、前記折込接合壁７０を前記側壁４０側に折り曲げて前記フランジ接合片８０が前記フランジ板６０の外面側に位置するように重ね合わせ、重ね合わせた個所を熱接着し、さらに前記折罫３５、４６、７８を山折りして前記フランジ板５０、６０および前記フランジ接合片８０とからなるフランジ部Ｆが開口部に形成された図１に示すような紙トレー１を得ることができる。紙トレー１を形成する原紙は、紙器用紙の両面に上記したような熱接着性樹脂層を設けた層構成からなるものであってもよいものである。なお、図１（ｂ）上、斜線で示した個所が上記した重ね合わせて熱接着した個所である。
【００１１】
上記したような前記フランジ板５０の前記トレー１としたときの外面側の上記した位置に前記直線状半切線Ｓを形成したことにより、スプリンター社製ＭＰ−ＨＴタイプの成形機を用いて前記ブランク板１’を自動製函しても、従来技術の項で説明したように図１（ｂ）の斜線で示す個所がズレたり、あるいは、剥離したりすることがなく、所定形状の体裁のよい紙トレー１を得ることができる。
【００１２】
なお、今までの説明においては、フランジ板５０に設ける切線Ｓを直線状半切線として説明してきたが、本発明の切線Ｓはこれに限ることはなく、たとえば、フランジ板５０を貫通する切線であってもよいし、また、曲線状切線であってもよいし、さらに、ミシン目等の断続的な切線であってもよいものである。
【００１３】
【発明の効果】
以上縷々説明したように、本発明の紙トレーは、ブランク板から雄型と雌型とからなる上記したような成形機を用いて紙トレーを成形しても、フランジ部に直線状半切線を設けたことにより歪な形状になることがなく、容器形状の体裁を損なうことがないという優れた効果を奏するものである。
【図面の簡単な説明】
【図１】本発明にかかる紙トレーの一実施例を示す（ａ）は収納部側から見た斜視図、（ｂ）は底面側から見た斜視図である。
【図２】底面側から見た図１のブランク板の平面図である。
【図３】図２に対応する従来のブランク板の平面図
【図４】図１（ｂ）に対応する従来の紙トレーの一実施例を示す斜視図である。
【図５】紙トレー成形機による成形の最終段階を説明する（ａ）は紙トレーの成形状態を示す図、（ｂ）は成形機の上から見た図である。
【符号の説明】
１紙トレー
１’ ブランク板
２０底壁
３０，４０側壁
７０折込接合壁
７０ａ，７０ｂ折込板
５０，６０フランジ板
８０フランジ接合片
２３，２４，３４、３５，４６，７８折罫
１００成形機の雄型
２００成形機の雌型の金型側壁
α，β フランジ板の端部
Ｓ直線状半切線
Ｆフランジ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper tray having a flange portion that is thermally bonded and sealed with a lid after filling with food or the like, and more specifically, a flange portion and a web that are automatically formed from a single blank plate by a molding machine. The present invention relates to a tapered paper tray having a corner portion.
[0002]
[Prior art]
Conventionally, this type of paper tray is folded on one edge of a blank plate made of paper container paper having a heat-adhesive resin layer on one side, for example, a rectangular bottom wall 20 as shown in FIG. Side walls 30, 40 are provided via the creases 23, 24, and the side edges of the adjacent side walls 30, 40 are connected to both side edges via the crease 34 and foldable adjacent via the crease 71. Folding joint walls 70 having folding plates 70a and 70b are provided, and flanges having projecting pieces α at both ends via the folds 35, the folds 46 and the creases 78 on the outer edges of the side walls 30 and 40 and the folds 70a. A blank plate 10 ′ made of paper container paper having a thermal adhesive resin layer on one surface provided with a flange plate 60 having flanges 60 and flange joint pieces 80 on both ends of the plate 50 and the flange joint piece 80 is placed on the upper side. Female mold to position (not shown) And a predetermined portion (the folding joint wall 70, the flange joint piece 80, and the protruding piece) of the blank plate 10 ′ by a heating device (not shown) mounted on the female mold (not shown). α, β) are heated, and a male mold (see FIG. 5) having a substantially I-shaped cross section is inserted into the female mold (not shown) from above the blank plate 10 ′ to thereby form the male mold (FIG. 5). And the female mold (not shown) cooperate to fold the creases 23 and 24 to the inner surface side so that the heat-adhesive resin layer of the blank plate 10 'is on the inner surface side. The side walls 30 and 40 are raised and the folding line 71 is valley-folded to the inner surface side to form the folding joint wall 70 in which the folding plates 70a and 70b are overlapped, and the end portion α of the flange plate 50 Is positioned below (external surface side) of the end portion β of the flange plate 60, and The folded joint wall 70 is bent to the side wall 40 side so that the flange joint piece 80 is positioned on the lower side (outer surface side) of the flange plate 60, and the overlapped portion is thermally bonded as shown in FIG. Such a paper tray 10 is obtained. In FIG. 4, the hatched portions are the above-described overlapping and heat-bonded portions. This type of paper tray is produced at a capacity of approximately 150 pieces / minute using a molding machine such as MP-HT type manufactured by Sprinter.
[0003]
However, the above-described molding machine manufactured by Sprinter is almost the final stage of the forming of the paper tray 10 shown in FIG. 4 (see FIG. 5A), and the paper as shown in FIG. 5B. In a state where the male mold 100 having a substantially I-shaped cross section is inserted into the tray 10, a mold side wall 200 having a convex cross section of a female mold (not shown) is engaged with the male mold 100, and The end portion α of the flange plate 50 (not shown) is positioned below (on the outer surface side) of the end portion β (not shown) of the flange plate 60, and the folding joint wall 70 is The side wall 40 includes the folding joint wall 70 which is folded to the side wall 40 side so that the flange joint piece 80 is positioned on the lower side (outer surface side) of the flange plate 60 and the overlapped portion is thermally bonded. It becomes a free state where the side is not supported by the female mold. In this final stage, the substantially central portion of the flange plate 50 is in a direction in which the female mold (not shown) comes into close contact with the male mold 100 by a mold side wall 200 having a convex cross section [on FIG. And both ends of the flange 50 are pressed downward (in the direction indicated by the arrow D in FIG. 5A) by the male mold 100, so that both ends of the flange plate 50 are In order to shift or peel off the heat-bonded part (the part shown by the diagonal lines in FIG. 5 (a)) that is in the temporary attachment state before being cooled and fixed due to the occurrence of stress (repulsive force due to the waist of the paper) There is a problem that a paper tray having a distorted shape cannot be formed without being formed into a predetermined shape or a paper tray having no container-shaped appearance (for example, see Patent Document 1). .
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-322676
[Problems to be solved by the invention]
Accordingly, the present invention has been made in view of the above problems, and is to provide a paper tray that does not become a distorted shape and does not impair the appearance of the container shape.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the inventor of the present invention has a paper tray 1 according to the first aspect in which side walls 30 and 40 are formed on four side edges of a rectangular bottom wall 20 via folding lines 23 and 24, respectively. Folding joint wall 70 having folding plates 70a and 70b that are provided and connected to both side edges via side folds 34 between side edges of adjacent side walls 30 and 40 and are foldable adjacent via folds 71. A flange plate 50 having projecting pieces α at both ends and a flange plate having projecting pieces β at both ends via the crease 35, the crease 46 and the crease 78 on the outer edges of the side walls 30, 40 and the folding plate 70a. 60 and the flange joining piece 80 are provided so that the projecting pieces α side located at both ends of the flange plate 50 of the paperboard paper having the heat-adhesive resin layer on at least one surface thereof are close to each other from the vicinity of the crease 35. The outer edge of the flange plate 50 The blank plate 1 ′ provided with a cutting line S extending in the vicinity thereof is folded up with the folds 23, 24 on the inner surface side with the thermoadhesive resin layer as an inner surface to raise the side walls 30, 40 and the crease 71. Are folded into the inner surface to form the folding joint wall 70 in which the folding plates 70 a and 70 b are overlapped, and the end α of the flange plate 50 is the outer surface side of the end β of the flange plate 60. In addition, the folded joint wall 70 is bent toward the side wall 40 so that the flange joint piece 80 is located on the outer surface side of the flange plate 60, and the overlapped portions are thermally bonded. And a paper tray 1 in which the creases 35, 46, 78 are folded in a mountain to form a flange portion F composed of the flange plates 50, 60 and the flange joint piece 80. The cut line S is formed on the side constituting the outer surface of the paper tray 1, and the cut line S is a half cut line .
[0007]
By adopting a configuration in which a cut line S is provided on the flange plate 50 on the protruding piece α side located at both ends of the flange plate 50 as described in the above-mentioned claim 1, for example, an MP-HT type manufactured by Sprinter Corporation Even if the paper tray is formed using a molding machine, in the final stage of the molding described in the section of the prior art, as shown in FIG. 5, the substantially central portion of the flange plate 50 is the female mold (not shown). The side wall 200 having a convex cross section is pressed in the direction in which it is in close contact with the male mold 100 (the direction indicated by the arrow M in FIG. 5A) and both end portions of the flange plate 50 are lowered by the male mold 100 (FIG. 5). (A) In the direction indicated by the arrow D], the stress applied to both ends of the flange plate 50 because the waist of the paper of the flange plate 50 is cut off at the cutting line S (paper (Repulsive force by the waist) The part of the heat-bonded part (the part indicated by the slanted line in FIG. 5A) in the temporary attachment state before cooling and fixing is not shifted or peeled off, and the appearance of the predetermined shape is good A paper tray can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The above-described present invention will be described in detail below with reference to the drawings.
1A and 1B show an embodiment of a paper tray according to the present invention. FIG. 1A is a perspective view seen from the storage unit side, FIG. 1B is a perspective view seen from the bottom side, and FIG. 1 is a paper tray, 1 'is a blank plate, 20 is a bottom wall, 30 and 40 are side walls, 70 is a folding joint wall, 70a and 70b are folding plates, and 50 and 60. Is a flange plate, 80 is a flange joint piece, 23, 24, 34, 35, 46 and 78 are creases, 100 is a male die of the molding machine, 200 is a female mold side wall of the molding machine, and α and β are flanges The edge part of a board, S shows a straight half cut line, F shows a flange part, respectively.
[0009]
1A and 1B show an embodiment of a paper tray according to the present invention. FIG. 1A is a perspective view seen from the storage portion side, FIG. 1B is a perspective view seen from the bottom side, and FIG. ) Is a developed view as viewed from the side, and the paper tray 1 has 20 on the entire surface of at least one surface (surface on which the contents are stored when used as a container) of about 240 to 400 g / m ^2. A base paper having a layer structure provided with a heat-adhesive resin layer made of an olefin resin such as polyethylene or polypropylene having a thickness of ˜60 μm is folded on the four edges of the rectangular bottom wall 20 as shown in FIG. Side walls 30, 40 are provided via 23, 24, and the side edges of adjacent side walls 30, 40 are connected to both side edges via folds 34 and are foldable adjacent via folds 71. A folding joint wall 70 having folding plates 70a, 70b is provided, and the side walls 30, 40 and In addition, a flange plate 50 having protruding pieces α at both ends, a flange plate 60 having protruding pieces β at both ends, and a flange joint piece 80 are provided on the outer edge of the folding plate 70a via a crease 35, a crease 46, and a crease 78. Further, the flange plate 50 on the other surface of the base paper (the outer surface side when a paper tray 1 described later) is approached from the vicinity of the crease 35 on the protruding piece α side located at both ends of the flange plate 50. The blank plate 1 ′ provided with the straight half-cut line S extending in the vicinity of the outer edge side of the flange plate 50 can be obtained by boxing.
[0010]
Box making of the blank plate 1 ′ configured as described above is actually automatically boxed using an MP-HT type molding machine manufactured by Sprinter, but specifically, the blank plate 1 ′. The folding lines 23, 24 are valley-folded to the inner surface side with the heat-adhesive resin layer as the inner surface, the side walls 30, 40 are raised, and the folding line 71 is valley-folded to the inner surface side, the folding plate 70a, The folding joint wall 70 is formed by superimposing the 70b, and the end part α of the flange plate 50 is positioned on the outer surface side of the end part β of the flange plate 60. Is folded to the side wall 40 side so that the flange joint piece 80 is positioned on the outer surface side of the flange plate 60, the overlapped portions are thermally bonded, and the creases 35, 46, 78 are folded in a mountain. The flange plate 0, 60 and the flange portion F formed of the flange joining pieces 80. it is possible to obtain a paper tray 1, as shown in FIG. 1, which is formed in the opening. The base paper for forming the paper tray 1 may have a layer structure in which the above-described thermoadhesive resin layers are provided on both sides of the paper container paper. In FIG. 1 (b), the hatched portions are the above-described overlapping and heat-bonded portions.
[0011]
By forming the straight half-cut line S at the above-described position on the outer surface side when the tray 1 of the flange plate 50 as described above is used, the blank is formed using an MP-HT type molding machine manufactured by Sprinter. Even if the plate 1 'is automatically boxed, as shown in the section of the prior art, the hatched portion in FIG. 1 (b) does not shift or peel off, and the appearance of the predetermined shape is good A paper tray 1 can be obtained.
[0012]
In the description so far, the cutting line S provided on the flange plate 50 has been described as a straight half-cut line. However, the cutting line S of the present invention is not limited to this, for example, a cutting line penetrating the flange plate 50. It may be a curved cut line, or may be an intermittent cut line such as a perforation.
[0013]
【The invention's effect】
As described above, the paper tray according to the present invention can form a straight half-cut line in the flange portion even if the paper tray is formed from a blank plate using a molding machine such as a male mold and a female mold as described above. By providing it, there is no distorted shape, and there is an excellent effect that the appearance of the container shape is not impaired.
[Brief description of the drawings]
FIG. 1A is a perspective view of an embodiment of a paper tray according to the present invention as viewed from the storage section side, and FIG. 1B is a perspective view as viewed from the bottom side.
FIG. 2 is a plan view of the blank plate of FIG. 1 viewed from the bottom side.
3 is a plan view of a conventional blank plate corresponding to FIG. 2. FIG. 4 is a perspective view showing an embodiment of a conventional paper tray corresponding to FIG.
FIGS. 5A and 5B are diagrams illustrating a final stage of molding by the paper tray molding machine, and FIG. 5B is a diagram showing a molding state of the paper tray, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper tray 1 'Blank board 20 Bottom wall 30,40 Side wall 70 Folding joining wall 70a, 70b Folding board 50,60 Flange board 80 Flange joining piece 23,24,34,35,46,78 Folding line 100 Male of a molding machine Mold 200 Female mold side walls α and β of molding machine End S of flange plate S Straight half cut line F Flange

Claims

矩形状底壁（２０）の四方の端縁に折罫（２３、２４）を介して側壁（３０、４０）を設け、隣り合う側壁（３０、４０）の側端縁の間に両側端縁に折罫（３４）を介して連結すると共に折罫（７１）を介して折畳み自在に隣接する折込板（７０ａ、７０ｂ）を有する折込接合壁（７０）を設け、前記側壁（３０、４０）および前記折込板（７０ａ）の外縁に折罫（３５）と折罫（４６）および折罫（７８）を介して両端に突出片（α）を有するフランジ板（５０）と両端に突出片（β）を有するフランジ板（６０）およびフランジ接合片（８０）を設けた少なくとも一方の面に熱接着性樹脂層を有する紙器用紙の前記フランジ板（５０）の両端に位置する前記突出片（α）側に前記折罫（３５）近傍から互いに接近するように前記フランジ板（５０）の外縁側近傍に延びる切線（Ｓ）を設けたブランク板（１’）を、前記熱接着性樹脂層を内面として前記折罫（２３、２４）を内面側に谷折りして前記側壁（３０、４０）を立ち上げると共に前記折罫（７１）を内面側に谷折りして前記折込板（７０ａ、７０ｂ）を重ね合わせた前記折込接合壁（７０）を形成し、さらに前記フランジ板（５０）の前記端部（α）が前記フランジ板（６０）の前記端部（β）の外面側に位置するように、また、前記折込接合壁（７０）を前記側壁（４０）側に折り曲げて前記フランジ接合片（８０）が前記フランジ板（６０）の外面側に位置するように重ね合わせ、重ね合わせた箇所を熱接着すると共に前記折罫（３５、４６、７８）を山折りして前記フランジ板（５０、６０）および前記フランジ接合片（８０）とからなるフランジ部（Ｆ）を形成した紙トレー（１）であって、前記フランジ板（５０）の前記紙トレー（１）としたときの外面を構成する側に前記切線（Ｓ）が形成されており、かつ、前記切線（Ｓ）が半切線であることを特徴とする紙トレー（１）。Side walls (30, 40) are provided on the four side edges of the rectangular bottom wall (20) via folding lines (23, 24), and both side edges are between the side edges of adjacent side walls (30, 40). Are connected via a crease (34) and foldable joining walls (70) having foldable plates (70a, 70b) adjacent to each other via a crease (71), and the side walls (30, 40). And a flange plate (50) having projecting pieces (α) at both ends via a crease (35), a crease (46) and a crease (78) on the outer edge of the folding plate (70a), and projecting pieces ( The protruding pieces (α) located at both ends of the flange plate (50) of the paper container paper having a thermal adhesive resin layer on at least one surface provided with the flange plate (60) having β) and the flange joint piece (80). ) Side of the flange plate so as to approach each other from the vicinity of the crease (35) 50) The blank plate (1 ′) provided with a cutting line (S) extending in the vicinity of the outer edge side is valley-folded on the inner surface side of the creases (23, 24) with the heat-adhesive resin layer as the inner surface, and the side wall (30, 40) is raised and the crease (71) is valley-folded to the inner surface to form the fold joint wall (70) on which the fold plates (70a, 70b) are overlapped, and further the flange plate The end portion (α) of (50) is positioned on the outer surface side of the end portion (β) of the flange plate (60), and the folding joint wall (70) is placed on the side wall (40) side. Fold and overlap so that the flange joint piece (80) is located on the outer surface side of the flange plate (60), heat-bond the overlapped portion, and fold the creases (35, 46, 78) The flange plate (50, 60) and the flange joint A paper tray (1) formed with a flange portion (F) composed of a piece (80) , wherein the flange line (50) is cut along the cut line (50) on the side constituting the outer surface of the paper tray (1). A paper tray (1) , wherein S) is formed, and the cut line (S) is a half cut line .