JP3740631B2

JP3740631B2 - Copy sheet

Info

Publication number: JP3740631B2
Application number: JP24641898A
Authority: JP
Inventors: 誠河村
Original assignee: Toppan Forms Co Ltd
Current assignee: Toppan Forms Co Ltd
Priority date: 1998-08-31
Filing date: 1998-08-31
Publication date: 2006-02-01
Anticipated expiration: 2018-08-31
Also published as: JP2000071649A

Description

【０００１】
【発明の属する技術分野】
本発明は複写用シートに関するものである。
【０００２】
【発明が解決しようとする課題】
従来から各種の複写帳票においては、上紙と下紙との二紙片を重ね合わせた形態とし、前記上紙の下面側に発色剤層を設けるとともに、下紙の上面側に顕色剤層を設け、上紙側から筆記記入や機械印字した情報が下紙にも同時複写されるようにしたものであった。また、近年において、静粛性や印字処理に優れているノンインパクトプリンタが多く普及してきたことから、このノンインパクトプリンタを用いて複写帳票への情報出力が行えるように、上下に二用紙が重ね合わされた形態とはせずに一用紙の形態で複写伝票を構成し、この一用紙形態の複写伝票をノンインパクトプリンタにセットして、予め記載内容などが判っている情報などをプリンタにて一次記入、即ち、印字し、その一次記入後にこの用紙を折り畳んで複写帳票を得るようにしている。このようにノンインパクトプリンタに対応すべく一用紙形態の複写用シートにして複写帳票の１パーツ化が進んできており、二次記入としての訂正事項や追加事項などの情報が記載できるようにするために、図８に示すように、複写用シートａの同一面上に発色剤層ｂと顕色剤層ｃとを折り合わせ時に対応する位置関係でスポット的に設けて折り合わせるようにしたり（図８（イ））、二次記入となる個所に自己発色剤層ｄを設ける形態（図８（ロ））としていた。
しかしながら、一用紙形態の複写用シートにスポット的に発色剤層と顕色剤層とを設けるようにしたものでは、この複写用シートの製造に際して前記発色剤層と顕色剤層とをスポット的に印刷する工程が増えて、発色剤層をスポット印刷する印刷ユニットと顕色剤層をスポット印刷する印刷ユニットとが必要になり、複写用シートを折り合わせたときの発色剤層と顕色剤層との対応位置関係を確認する必要も生じており、製造に手間を要するものとなっていた。また、自己発色剤層を有する複写用シートでは、この複写用シートの取り扱い時に不用意な力が加わるとその力が加わった部分が発色してしまい、自己発色剤層側に複写記入された情報が見難くなるなどの不都合があって、取り扱いや保管管理に注意を要するものとなっていた。
そこで本発明は上記した事情に鑑み、発色剤層や顕色剤層を別途に複写用シートに設ける手間を無くし、また、複写記入部分の汚損を生じさせ難くすることを課題とし、予め顕色剤層や発色剤層を有している用紙を組み合わせて一用紙形態の複写用シートを得ることを目的とする。
【０００３】
【課題を解決するための手段】
本発明は上記課題を考慮してなされたもので、片面に発色剤層を有している上紙と片面に顕色剤層を有している下紙とが、端縁同士を重ね合わせて押圧接着して重ね合わせ部分の厚さを減じてなる接合部を介して連接され、下紙の顕色剤層は、前記接合部側から下紙を前記上紙の発色剤層側に折り合わせたときの前記発色剤層と対向する面側に設けられていることを特徴とする複写用シートを提供して、上記課題を解消するものである。
また、もう一つの発明は、片面に発色剤層を有している上紙と一面側に発色剤層を有し他方の面側に顕色剤層を有している中紙と片面に顕色剤層を有している下紙とが、端縁同士を重ね合わせて押圧接着してなる接合部を介して、該接合部から前記三紙片を折り合わせたときに上位から上紙、中紙、下紙の順に重ね合わされるように連接され、前記中紙の顕色剤層は、該中紙を上紙の発色剤層側に折り合わせたときの上紙の発色剤層と対向する面側に設けられて、かつ、中紙の発色剤層は中紙の他方の片面側に設けられ、前記下紙の顕色剤層は、該下紙を中紙の発色剤層側に折り合わせたときの中紙の発色剤層と対向する面側に設けられていることを特徴とする複写用シートであり、この複写用シートを提供して、上記課題を解消するものである。
そして、本発明にあっては、上記接合部を介して隣り合う二紙片の内、折り合わせ時に紙片自体の接合部側の端縁に直接折り返されるようになる紙片に、折り用ミシン目からなる折り部が設けられ、該折り部が接合部に近接していることが良好である。
【０００４】
【発明の実施の形態】
つぎに本発明を図１から図７に示す実施の形態に基づいて詳細に説明する。
図中１は本発明に係る複写用シートで、該複写用シート１は上紙２と下紙３とが連接してなるものであり、前記上紙２にあっては上面２ａを情報記載面とするとともに、下面２ｂの全面に発色剤層４が設けられ、さらに、図示はしていないがその下面２ｂには定款や説明文などが設けられている。下紙３にあっては上面３ａが情報記載面として、また、定款や説明文などを設ける面として構成されるとともに、その下面３ｂの全面に顕色剤層５が設けられている。前記上紙２の上面２ａと下紙３の下面３ｂとには同じフォーマットの記載項目を設けるようにしており、折り合わせた状態で発色剤層４と顕色剤層５とを相対させ二次記入として上紙２側に記載した情報が下紙３に複写されるようにしている。前記上紙２としては予め基材の片面に発色剤層４を、例えば発色剤をカプセル化して塗布形成してなる用紙を用いたものであり、また、下紙３としては予め基材の片面に顕色剤層５を、例えば活性白土を塗布して形成した用紙を用いたものである。
上前記上紙２と下紙３とは、図示しない接着剤を介在させた状態で端縁２ｃ，３ｃ同士を重ね合わせ、さらにその端縁２ｃ，３ｃの重なり部分を押圧接着してなる接合部６を介して連接されており、前記接合部６は押圧接着により上紙厚と下紙厚との合計厚よりは小さな厚さのものとして設けられている。そして、前記接合部６において、上紙２の端縁２ｃが下紙３の端縁３ｃの上位に接合されているこの図示の形態のものでは、下紙３の接合部６に沿った位置に近接した状態で折り用ミシン目を穿設してなる折り部７が設定されていて、図２に示されているように、この折り部７から下紙３を上紙２の発色剤層４側に折り合わせたときに、下紙３の折り返し部分の内側に上紙２の端縁２ｃが介在しないように、即ち、折り合わせした時に下紙３自体の接合部６側の端縁３ｃにこの下紙３が直接折り返されるように設けられ、シート１を折り合わせたときに折り部７周りが厚くならないように設けられている。なお、図２においては、折り合わせ時の形態説明を容易にするために、上紙２、下紙３、発色剤層４、顕色剤層５の厚さは表現していない。
【０００５】
複写用シート１では上紙２と下紙３との折り合わせ時に上紙２の顕色剤層４と下紙３の顕色剤層５とが相対すればよいものであることから、図３に示すように接合部６において上紙２の端縁２ｃの上に下紙３の端縁３ｃが重なるように上紙２と下紙３とを連接し、上紙２側に折り部７を設けるようにしてもよい。
【０００６】
図４と図５は本発明の複写用シート１を上紙２と下紙３と中紙８の三紙片からなるものとして示している。この図４に示した実施の例では、上紙２と中紙８と下紙３とを横一連にしてＺ状に折り合わせることで、上位から上紙２、中紙８、下紙３とが重なるようにしたものである。上紙２の上面２ａには情報記載のためのフォーマットが設けられ、その上紙２の下面２ｂの全面に発色剤層４が設けられ、そして、下面２ｂに定款や説明文などが設けられている。中紙８にあっては上面８ａの全面に発色剤層４が設けられ、合わせて定款や説明文などを設けることも可能であり、中紙８の下面８ｂの全面には顕色剤層５が設けられているとともに、上紙２側と同様の記載のためのフォーマットが設けられ、さらに、下紙３の上面３ａの全面に顕色剤層５が設けられているとともに、上紙２や中紙８と同様のフォーマットが設けられ、下面３ｂを定款や説明文などを記載する面としている。そして、この三紙片を重ね合わせて上位の上紙２側に二次記入として記載した情報が下位の中紙８や下紙３にも同時に複写されるようにしているものである。折り部７は上紙２の端縁２ｃの下方に中紙８の端縁８ｃを押圧接着してなる接合部６に近接させる状態にして中紙８に穿設されているとともに、中紙８のもう一方の端縁８ｄの上方に下紙３の端縁３ｃを押圧接着してなる接合部６に近接させる状態にして下紙３に穿設されている。
そして、矢印にて示すようにこの複写用シート１をＺ状に折り合わせることで、上紙２の発色剤層４が中紙８の顕色剤層５に相対し、中紙８の発色剤層４が下紙３の顕色剤層５に相対するようになる（図５参照）。
さらに、図６と図７はＣ折りすることで三紙片の対向面間で発色剤層と顕色剤層とが相対するようにした例を示している。この図５に示した例では、上紙２、下紙３、中紙８とが横一連にして連接され、シート１の一側方に配置した前記中紙８を折り入れるようにＣ折りすることで、上位から上紙２、中紙８、下紙３が重なるようにしたものである。図示するように、上紙２の下面２ｂの全面に発色剤層４が設けられ、下紙３の下面３ｂの全面に顕色剤層５が設けられ、さらにシート１の側方に位置する中紙８にあっては上面８ａの全面に顕色剤層５が設けられているとともに、中紙８の下面８ｂの全面には発色剤層４が設けられている。そして、Ｃ状に重ね合わせしたときに三紙の上方側となる面に同一のフォーマットが設けられ、各紙片のＣ状に折り合わせたときに下方となる面にはそれぞれ定款や説明文などを記載するようにしている。折り部７は上紙２の端縁２ｃの上方に下紙３の端縁３ｃを押圧接着してなる接合部６に近接させる状態にして上紙２に穿設されているとともに、下紙３のもう一方の端縁３ｄの下方に中紙８の端縁８ｃを押圧接着してなる接合部６に近接させる状態にして中紙８に穿設されている。
そして、矢印にて示すようにこの複写用シート１をＣ状に折り合わせることで、上紙２の発色剤層４が中紙８の顕色剤層５に相対し、中紙８の発色剤層４が下紙３の顕色剤層５に相対するようになり（図７参照）、上紙側から二次記入した情報が下位の中紙、下紙に複写されるようにしている。
【０００７】
【発明の効果】
以上説明した発明によれば、発色剤層を有する紙片と顕色剤層を有する紙片とが重ね合わせ部分で厚さを減じて連接された状態となっているため、ノンインパクトプリンタにて情報印字が行えるとともに、複写時には予め発色剤層を有する紙片と予め顕色剤層を有する紙片とを折り合わせるようになるため、全面に亘って情報の複写が行えるようになり、折り合わせ精度を要することがない。さらには発色剤層を有する紙片と顕色剤層を有する紙片とを重ね合わせた状態としない限り複写が行えないため、シートを展開した状態での不用意な発色を防止でき、取り扱いが極めて容易になるなど、実用性に優れた効果を奏するものである。
【図面の簡単な説明】
【図１】本発明に係る複写用シートの二紙片からなる一例を断面で示す説明図である。
【図２】一例における折り合わせ状態を断面で概略的に示す説明図である。
【図３】二紙片からなる他の例を断面で示す説明図である。
【図４】三紙片からなる複写用シートの一例を断面で示す説明図である。
【図５】三紙片からなる複写用シートの折り合わせ状態を断面で概略的に示す説明図である。
【図６】三紙片からなる複写用シートの他の例を断面で示す説明図である。
【図７】他の例の折り合わせ状態を断面で概略的に示す説明図である。
【図８】従来例を示す説明図である。
【符号の説明】
１…複写用シート
２…上紙２ｃ…端縁
３…下紙３ｃ，３ｄ…端縁
４…発色剤層
５…顕色剤層
６…接合部
７…折り部
８…中紙８ｃ，８ｄ…端縁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a copying sheet.
[0002]
[Problems to be solved by the invention]
Conventionally, in various copy forms, two sheets of upper paper and lower paper are overlapped, and a color developer layer is provided on the lower surface side of the upper paper, and a developer layer is provided on the upper surface side of the lower paper. It was provided so that information written or machine-printed from the upper paper side was copied on the lower paper at the same time. In recent years, many non-impact printers that are excellent in quietness and print processing have become widespread, so that two sheets of paper can be stacked one above the other so that information can be output to a copy form using this non-impact printer. Make a copy slip in the form of one sheet instead of the form, set the copy slip in one sheet form in a non-impact printer, and fill in the information that you know in advance with the printer That is, printing is performed, and after the primary entry, the sheet is folded to obtain a copy form. In this way, a copy sheet in a single sheet form has been made into one part in order to correspond to a non-impact printer, so that information such as correction items and additional items as secondary entries can be described. For this purpose, as shown in FIG. 8, the color developer layer b and the developer layer c are provided on the same surface of the copying sheet a in a spot relationship with the corresponding positional relationship at the time of folding. In FIG. 8 (a)), the self-coloring agent layer d is provided in the secondary entry (FIG. 8 (b)).
However, in the case where a color developer layer and a developer layer are spot-provided on a copy sheet in the form of one sheet, the color developer layer and the developer layer are spot-like in the production of the copy sheet. The number of processes for printing is increased, and a printing unit for spot printing the color developer layer and a printing unit for spot printing the color developer layer are required, and the color developer layer and the color developer when the copy sheet is folded. The necessity of confirming the corresponding positional relationship with the layer has also arisen, which requires labor for manufacturing. In addition, in a copying sheet having a self-coloring agent layer, if an inadvertent force is applied during the handling of the copying sheet, the portion where the force is applied is colored, and information copied and entered on the self-coloring agent layer side Has become inconvenient, such as being difficult to see, and requires careful handling and storage management.
Therefore, in view of the above circumstances, the present invention has an object to eliminate the trouble of separately providing a color former layer and a developer layer on a copy sheet, and to make it difficult to cause contamination of a copy entry portion. An object is to obtain a sheet for copying in one sheet form by combining sheets having an agent layer and a color former layer.
[0003]
[Means for Solving the Problems]
The present invention has been made in consideration of the above problems, and an upper paper having a color former layer on one side and a lower paper having a developer layer on one side are overlapped with each other. It is connected via a joint that is pressed and bonded to reduce the thickness of the overlapping part. The developer layer of the lower paper is folded from the joint to the color developer layer of the upper paper. The present invention provides a copy sheet, which is provided on the surface facing the color former layer at the time, and solves the above problems.
Another aspect of the invention is an upper paper having a color former layer on one side, a middle paper having a color former layer on one side and a developer layer on the other side, and a paper on one side. When the three paper pieces are folded from the joint through the joint formed by pressing and adhering the edges overlapped with the lower paper having the colorant layer, the upper paper from the top, the middle The color developer layer of the middle paper is opposed to the color former layer of the upper paper when the middle paper is folded to the color former layer side of the upper paper. The color developer layer of the middle paper is provided on the other side of the middle paper, and the developer layer of the lower paper is folded on the color developer layer side of the middle paper. A copying sheet characterized in that it is provided on the side facing the color former layer of the inner paper when it is put together, and this copying sheet is provided to solve the above problems. That.
In the present invention, among the two paper pieces adjacent to each other through the joint portion, the paper piece that is to be directly folded to the edge of the paper piece itself on the joint portion side at the time of folding is composed of folding perforations. It is favorable that a fold portion is provided and the fold portion is close to the joint portion.
[0004]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in detail based on the embodiment shown in FIGS.
In the figure, reference numeral 1 denotes a copying sheet according to the present invention. The copying sheet 1 is formed by connecting an upper paper 2 and a lower paper 3, and the upper paper 2 has an upper surface 2 a on the information description surface. In addition, the color former layer 4 is provided on the entire surface of the lower surface 2b. Further, although not illustrated, the lower surface 2b is provided with articles of incorporation and explanatory notes. In the lower sheet 3, the upper surface 3 a is configured as an information description surface and as a surface for providing articles of incorporation and explanatory texts, and a developer layer 5 is provided on the entire lower surface 3 b. The upper sheet 2 has the upper surface 2a and the lower sheet 3 have the lower surface 3b with the same format description items, and the color developer layer 4 and the developer layer 5 are opposed to each other in the folded state. Information written on the upper paper 2 side as an entry is copied on the lower paper 3. The upper paper 2 is a paper in which the color former layer 4 is formed on one side of the base material in advance, for example, a paper obtained by encapsulating and forming the color former, and the lower paper 3 is provided on one side of the base material in advance. Further, the developer layer 5 is used, for example, a paper formed by applying activated clay.
The upper paper 2 and the lower paper 3 are joined portions formed by overlapping the edges 2c and 3c with an adhesive (not shown) interposed therebetween, and further pressing and bonding the overlapping portions of the edges 2c and 3c. 6, the joint portion 6 is provided with a thickness smaller than the total thickness of the upper paper thickness and the lower paper thickness by pressure bonding. In the joint portion 6, the edge 2 c of the upper paper 2 is joined to the upper position of the edge 3 c of the lower paper 3. In the illustrated embodiment, at the position along the joint 6 of the lower paper 3. A folding portion 7 formed by perforating a folding perforation in an adjacent state is set. As shown in FIG. 2, the lower sheet 3 is transferred from the folding portion 7 to the color former layer 4 of the upper paper 2. So that the edge 2c of the upper paper 2 does not intervene inside the folded portion of the lower paper 3, that is, the edge 3c on the joint 6 side of the lower paper 3 itself when folded. The lower sheet 3 is provided so as to be directly folded, and is provided so that the periphery of the folded portion 7 does not become thick when the sheet 1 is folded. In FIG. 2, the thicknesses of the upper paper 2, the lower paper 3, the color former layer 4, and the developer layer 5 are not expressed in order to facilitate explanation of the form at the time of folding.
[0005]
In the copying sheet 1, the developer layer 4 of the upper paper 2 and the developer layer 5 of the lower paper 3 only need to be opposed when the upper paper 2 and the lower paper 3 are folded together. As shown in FIG. 5, the upper paper 2 and the lower paper 3 are connected so that the edge 3c of the lower paper 3 overlaps the edge 2c of the upper paper 2 at the joining portion 6, and the folding portion 7 is formed on the upper paper 2 side. You may make it provide.
[0006]
FIGS. 4 and 5 show the copying sheet 1 of the present invention as consisting of three pieces of upper paper 2, lower paper 3 and middle paper 8. FIG. In the embodiment shown in FIG. 4, the upper paper 2, the middle paper 8, and the lower paper 3 are horizontally aligned and folded in a Z shape, so that the upper paper 2, the middle paper 8, the lower paper 3, Are made to overlap. A format for describing information is provided on the upper surface 2 a of the upper paper 2, the color former layer 4 is provided on the entire lower surface 2 b of the upper paper 2, and the articles of association and explanations are provided on the lower surface 2 b. Yes. In the inner paper 8, the color developer layer 4 is provided on the entire upper surface 8 a, and it is also possible to provide the articles of association and the explanatory text together. The developer layer 5 is provided on the entire lower surface 8 b of the intermediate paper 8. And a format for description similar to the upper paper 2 side, a developer layer 5 is provided on the entire upper surface 3a of the lower paper 3, and the upper paper 2 and A format similar to that of the inner paper 8 is provided, and the lower surface 3b is used as a surface on which articles of association and explanatory texts are written. Then, the information described as secondary entry on the upper upper paper 2 side by overlapping these three paper pieces is simultaneously copied to the lower middle paper 8 and lower paper 3. The folding portion 7 is formed in the intermediate paper 8 below the edge 2c of the upper paper 2 so that the edge 8c of the intermediate paper 8 is brought close to the joining portion 6 formed by pressing and bonding. The lower paper 3 is perforated in the state where the edge 3c of the lower paper 3 is brought close to the joint 6 formed by pressing and bonding the other edge 8d.
Then, as shown by the arrow, the copying sheet 1 is folded in a Z shape so that the color former layer 4 of the upper paper 2 is opposed to the developer layer 5 of the middle paper 8, and the color former of the middle paper 8 is obtained. The layer 4 comes to face the developer layer 5 of the lower paper 3 (see FIG. 5).
Further, FIGS. 6 and 7 show an example in which the color former layer and the developer layer are opposed to each other between the opposing surfaces of the three paper pieces by C-folding. In the example shown in FIG. 5, the upper paper 2, the lower paper 3, and the middle paper 8 are connected in a horizontal series, and C-folded so that the middle paper 8 disposed on one side of the sheet 1 is folded. In this way, the upper paper 2, the middle paper 8, and the lower paper 3 are overlapped from the top. As shown in the figure, a color former layer 4 is provided on the entire lower surface 2 b of the upper paper 2, a developer layer 5 is provided on the entire lower surface 3 b of the lower paper 3, and further, the middle located on the side of the sheet 1. In the paper 8, the developer layer 5 is provided on the entire upper surface 8 a, and the color developer layer 4 is provided on the entire lower surface 8 b of the intermediate paper 8. The same format is provided on the upper side of the three papers when they are stacked in a C shape, and the articles of incorporation and explanations are provided on the lower side when the paper pieces are folded into the C shape. It is trying to describe. The folding portion 7 is formed in the upper paper 2 so as to be close to the joining portion 6 formed by pressing and bonding the end edge 3c of the lower paper 3 above the edge 2c of the upper paper 2 and the lower paper 3 The intermediate paper 8 is perforated so as to be close to the joint portion 6 formed by pressing and adhering the edge 8c of the intermediate paper 8 below the other edge 3d.
Then, as shown by the arrow, the copying sheet 1 is folded in a C shape so that the color former layer 4 of the upper paper 2 is opposed to the developer layer 5 of the middle paper 8, and the color former of the middle paper 8 is obtained. The layer 4 is opposed to the developer layer 5 of the lower paper 3 (see FIG. 7), so that the information secondarily entered from the upper paper side is copied to the lower middle paper and lower paper.
[0007]
【The invention's effect】
According to the above-described invention, the paper piece having the color developer layer and the paper piece having the developer layer are connected to each other at the overlapping portion with a reduced thickness. In addition, when copying, a piece of paper having a color former layer in advance and a piece of paper having a developer layer in advance are folded, so that information can be copied over the entire surface, and matching accuracy is required. There is no. Furthermore, since copying cannot be performed unless the paper piece having the color developer layer and the paper piece having the developer layer are overlaid, inadvertent color development can be prevented when the sheet is unfolded, and handling is extremely easy. Etc., and has an effect that is excellent in practicality.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing in cross section an example of two sheets of a copying sheet according to the present invention.
FIG. 2 is an explanatory diagram schematically showing, in section, a folded state in one example.
FIG. 3 is an explanatory diagram showing in cross section another example of two paper pieces.
FIG. 4 is an explanatory diagram showing, in section, an example of a copying sheet composed of three paper pieces.
FIG. 5 is an explanatory diagram schematically showing, in section, a folded state of a copy sheet made of three paper pieces.
FIG. 6 is an explanatory view showing, in cross section, another example of a copying sheet made of three paper pieces.
FIG. 7 is an explanatory diagram schematically showing, in cross section, a folded state of another example.
FIG. 8 is an explanatory diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Copy sheet 2 ... Upper paper 2c ... Edge 3 ... Lower paper 3c, 3d ... Edge 4 ... Color developer layer 5 ... Developer layer 6 ... Joint part 7 ... Folding part 8 ... Middle paper 8c, 8d ... Edge

Claims

An upper paper having a color developer layer on one side and a lower paper having a developer layer on one side are overlapped with each other and pressed to reduce the thickness of the overlapped portion. Connected through a joint,
The developer layer of the lower paper is provided on the side facing the color former layer when the lower paper is folded from the joint side to the color former layer side of the upper paper. Copy sheet.

An upper paper having a color former layer on one side, a color former layer on one side, a middle paper having a developer layer on the other side, and a developer layer on one side. When the three paper pieces are folded at the joining portion side through the joining portion formed by pressing and adhering the edges to each other, the lower paper has the upper paper, the middle paper, and the lower paper. Connected in order to overlap,
The developer layer of the middle paper is provided on the surface facing the color former layer of the upper paper when the middle paper is folded to the color former layer side of the upper paper, and the color former of the middle paper The layer is provided on the other side of the inner paper,
The color developer layer of the lower paper is provided on a side facing the color former layer of the middle paper when the lower paper is folded to the color former layer side of the middle paper. Sheet.

Of the two paper pieces adjacent to each other via the joint portion, a folding portion having a perforation for folding is provided on the paper piece that is directly folded to the edge of the paper piece itself on the joint portion side at the time of folding. The copying sheet according to claim 1, wherein the is close to the joint.