JP2005007525A

JP2005007525A - Coated sheet cutting method and device

Info

Publication number: JP2005007525A
Application number: JP2003174784A
Authority: JP
Inventors: Koichi Kawai; 弘一川井
Original assignee: Fuji Photo Film Co Ltd
Current assignee: Fujifilm Holdings Corp
Priority date: 2003-06-19
Filing date: 2003-06-19
Publication date: 2005-01-13

Abstract

PROBLEM TO BE SOLVED: To restrain the occurrence of a crack and a flaw in a coating layer, when cutting a coated sheet, in a coated sheet cutting method and a device. SOLUTION: A disk-like cutting lower blade 10 and a disk-like cutting upper blade 20 having an edge angle θ2 smaller than an edge angle θ1 of the cutting lower blade 10, are arranged so that the rotational axes C1 and C2 of both blades become parallel, and a part of both blades mutually overlaps in the rotational axis extending direction. A coated sheet 30 is inserted between both blades, and is carried in the carrying direction orthogonal to the rotational axis, while contacting a surface of the support 32 side for supporting this coated layer 31 of the coating sheet 30, with the outer periphery 12 of the cutting lower blade 10, while rotating both blades, and this coating sheet is cut. In cutting, a contact starting position of the coated sheet 30 and the cutting upper blade 20, is positioned in a contact area for contacting with the outer periphery 12 of the cutting lower blade 10 in the coated sheet 30; and overlap quantity of mutually overlapping in a part of both blades, is set to 1.5 mm or less. COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、塗工シート裁断方法および装置に関し、詳しくは、対向する円板状の裁断刃の間に塗工シートを通してこの塗工シートを裁断する塗工シート裁断方法および装置に関するものである。
【０００２】
【従来の技術】
従来より、紙、フィルム、あるいは樹脂被覆紙等のシート状の支持体に、シリカ微粒子等を樹脂バインダーで結合した塗工層を積層してなる塗工シートが知られている。上記塗工シートは、連続搬送される長尺の支持体上に塗工層を形成するための塗工液を塗布し乾燥させてロール状に巻き取った原反として製作された後、このロール状の原反から引き出されて搬送されつつ搬送方向に沿って裁断されたり、搬送方向と直交する方向に切断されたりして所望の大きさに切り出され情報記録紙等として製品化される。上記搬送方向の裁断には一般にシャーカット方式が用いられており、このシャーカット方式では、鋭利な刃先角を有する円板状の裁断上刃と、刃先角が直角に近い円板状の裁断下刃との間に上記搬送される塗工シートを通しつつ、裁断上刃と裁断下刃とを回転させてこの塗工シートを裁断している（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２００１−２６００７７号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、種々な態様での塗工シートの製作の要求に伴い上記塗工層にも種々の材質が使用されるようになると、上記ロール状の塗工シートを引き出して搬送方向に裁断する際の適切な裁断条件の設定が難しくなり、この裁断条件が不適切であると裁断された切り口近傍の塗工層にひび割れやキズが生じるという問題がある。特に塗工層が硬く脆弱である場合には上記ひび割れやキズが顕著に現れる。
【０００５】
本発明は、上記事情に鑑みてなされたものであり、塗工シートを裁断する際の塗工層におけるひび割れやキズの発生を抑制し、これにより、裁断品質の低下を防ぐことができる塗工シート裁断方法および装置を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
本発明の塗工シート裁断方法は、円板状の裁断下刃とこの裁断下刃の刃先角度より小さな刃先角度を有しこの裁断下刃に対向する円板状の裁断上刃とを、両刃の回転軸線が平行となるように、かつ該回転軸線が延びる方向において両刃の一部分が互いに重なるように配置し、両刃を回転させつつ、塗工層を有する塗工シートの前記塗工層の側とは反対側の面を前記裁断下刃の外周に接触させながら塗工シートを前記両刃の間へ通して前記回転軸線と直交する搬送方向に搬送し、塗工シートを搬送方向に裁断する塗工シート裁断方法であって、塗工シートを裁断する際に、塗工シート中の裁断下刃の外周に接触する接触領域内に裁断上刃と塗工シートとの接触開始位置を位置させるとともに、前記両刃の一部分が互いに重なるオーバーラップ量が１．５ｍｍ以下となるようにして前記塗工シートを裁断することを特徴とするものである。
【０００７】
本発明の塗工シート裁断装置は、円板状の裁断下刃と、この裁断下刃の刃先角度より小さな刃先角度を有しこの裁断下刃に対向する円板状の裁断上刃であって、裁断下刃の回転軸線に平行な回転軸線を有し、かつ該回転軸線が延びる方向において裁断下刃の一部分とこの裁断上刃の１部分とが互いに重なるように配置した裁断上刃とを備え、両刃を回転させつつ、塗工層を有する塗工シートの前記塗工層の側とは反対側の面を裁断下刃の外周に接触させながらこの塗工シートを両刃の間へ通して前記回転軸線と直交する搬送方向に搬送し、該塗工シートを搬送方向に裁断する塗工シート裁断装置であって、塗工シート中の裁断下刃の外周に接触する接触領域内に裁断上刃と塗工シートとの接触開始位置が位置するとともに、前記両刃の一部分が互いに重なるオーバーラップ量が１．５ｍｍ以下であることを特徴とするものである。
【０００８】
前記「両刃の一部分が互いに重なるオーバーラップ量」とは、前記回転軸線方向から見たときに、前記両刃それぞれの回転軸線を通る線上における前記両刃が互いに重なる領域に含まれる長さを意味するものである。
【０００９】
前記塗工シートは、例えば、炭酸カルシウム、アルミナ水和物、あるいはシリカ等の無機材料を主成分とする微粒子を樹脂バインダ等で結合して形成した塗工層を紙、フィルム、樹脂被覆紙等の支持体上に積層したものとすることができる。
【００１０】
前記塗工シートは、インクジェット用の記録紙とすることができる。なお、インクジェット用の記録紙は、シリカ等を主成分とする微粒子をポリビニルアルコール等からなる樹脂バインダで結合して形成した塗工層を、紙、フィルム、あるいは樹脂被覆紙等の支持体上に積層したものである。特にフォト光沢タイプのインクジェット用紙は、インクの吸収性を向上させるためにシリカ等の微粒子を結合させるバインダの量を少なくしているため、曲げ等の外力により容易に微粒子同士の結合が解かれ割れが生じてしまう特徴を持つ。
【００１１】
前記「塗工シートと裁断上刃との接触開始位置」とは、塗工シートが裁断されるときにこの塗工シートと裁断上刃とが接触する位置のうちの、塗工シートが搬送される搬送方向の最も上流側の位置を意味するものである。
【００１２】
【発明の効果】
本発明の塗工シート裁断方法および装置によれば、塗工層を有する塗工シートを裁断する際に、塗工シート中の裁断下刃の外周に接触する接触領域内に裁断上刃と塗工シートとの接触開始位置を位置させるとともに、両刃の一部分が互いに重なるオーバーラップ量が１．５ｍｍ以下となるようにして塗工シートを裁断するようにしたので、塗工シートを裁断する際の裁断上刃が塗工シートを押し曲げる量を小さくすることができ、この塗工シートの局部的な変形を小さく抑えることができる。これにより、塗工シートの裁断において、塗工層にひび割れやキズを生じさせるような大きな応力の発生を抑制することができ、上記裁断品質の低下を防ぐことができる。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態について、図面を用いて説明する。図１は本発明の塗工シート裁断方法を実施するための塗工シート裁断装置の概略構成を示す側面図、図２は裁断下刃と裁断上刃との位置関係を一部断面で示した拡大正面図、図３は図２の３−３断面を示す図である。
【００１４】
図示の塗工シート裁断装置は、円板状の裁断下刃１０、裁断下刃１０を回転させる下刃回転モータ１５、裁断下刃１０に対向する円板状の裁断上刃２０、裁断上刃２０を回転させる上刃回転モータ２５、および長尺の塗工シート３０を搬送する搬送部４０を備えている。
【００１５】
上記塗工シート３０は、シリカを主成分とする微粒子をポリビニルアルコール等からなる樹脂バインダで結合した塗工層３１を樹脂被覆紙等からなる支持体３２上に積層してなり、この塗工シート３０がロール状に巻かれた原反であるシートロール３５から供給される。また、塗工シート３０はインクジェット用の記録紙であり、上記支持体３２には、上記樹脂被覆紙の他、紙、あるいはフィルム等を採用することができ、上記塗工層３１は上記支持体３２より硬くて脆弱である。
【００１６】
図２および図３に示すように、裁断下刃１０と裁断上刃２０とは、裁断下刃１０の回転軸線Ｃ１と裁断上刃２０の回転軸線Ｃ２とが平行となるように、かつ上記回転軸線Ｃ１および回転軸線Ｃ２が延びる方向において裁断下刃１０と裁断上刃２０の一部分とが互いに重なるように、すなわち、回転軸線Ｃ１，Ｃ２が延びる方向から見たときに裁断下刃１０の一部分と裁断上刃２０の一部分とが互いに重なるように配置されており（図３参照）、裁断上刃２０の刃先角θ２は裁断下刃１０の刃先角θ１より小さい。
【００１７】
なお、裁断下刃１０は、下刃回転モータ１５の回転軸に連結されている下刃軸１６の外周に嵌合し、この下刃軸１６の外周に嵌合する下刃スペーサ１７Ａと下刃スペーサ１７Ｂとの間に挟まれてこの下刃軸１６と一体的に回転する。
【００１８】
また、裁断上刃２０は、上刃回転モータ２５の回転軸に連結されている上刃軸２６の外周に嵌合し、この上刃軸２６の外周に嵌合する上刃スペーサ２７Ａと上刃スペーサ２７Ｂとの間に挟まれてこの上刃軸２６と一体的に回転する。
【００１９】
搬送部４０は、回転軸上にシートロール３５を回転可能に保持するロール保持軸４１と、ロール保持軸４１に保持されたシートロール３５から塗工シート３０を引き出すシート引出ローラ部４４と、ロール保持軸４１からシート引出ローラ部４４までの塗工シート３０の搬送経路に配置され塗工シート３０の搬送方向を変更したり塗工シート３０が受ける搬送方向への引張力（テンション）を適切に保ったりするパスロール４２Ａ、４２Ｂ、４２Ｃ、およびパスロール４３Ａ，４３Ｂ、４３Ｃ、４３Ｄと、シート引出ローラ部４４によって引き出されて裁断下刃１０と裁断上刃２０との間を通って裁断された塗工シート３０をシート切断部５０に供給するシート切断供給ローラ部４６と、シート引出ローラ部４４とシート切断供給ローラ部４６の間に配置され塗工シート３０の搬送方向を変更したり塗工シート３０が受ける搬送方向への引張力（テンション）を適切に保ったりするパスロール４５Ａ，４５Ｂ、４５Ｃとを有している。なお、塗工シート３０が裁断下刃１０と裁断上刃２０との間を通って裁断される位置は、パスロール４３Ｄとシート引出ローラ部４４との間の搬送経路中である。
【００２０】
シート引出ローラ部４４は、回転する２つのローラ４４Ａ、４４Ｂの間に塗工シート３０を挟んでこの塗工シート３０をシートロール３５から引き出して搬送する。また、シート切断供給ローラ部４６は、シート切断部５０による塗工シート３０の所定の切断が実施されるように、間欠回転する２つのローラ４６Ａ、４６Ｂの間に塗工シート３０を通してこの塗工シート３０をシート切断部５０に供給する。
【００２１】
なお、上記搬送部４０は、塗工シート３０の塗工層３１の側とは反対側の面である支持体３２側の面を裁断下刃１０の外周１２に接触させながら、塗工シート３０を上記裁断下刃１０と裁断上刃２０との間へ通して上記回転軸線Ｃ１と直交する搬送方向Ｈに搬送する。また、シート切断部５０は、シート切断供給ローラ部４６を通して供給された塗工シート３０を、この塗工シート３０が搬送される方向と直交する方向に切断する。
【００２２】
次に、塗工シート裁断装置による塗工シート３０の裁断について詳しく説明する。
【００２３】
塗工シート３０は、シート引出ローラ部４４の２つの搬送ローラ４４Ａ、４４Ｂの間に挟まれてシートロール３５から引き出され搬送される。この塗工シート３０は、上記パスロール４２Ａからパスロール４３Ｄを経由し、下刃回転モータ１５の駆動により回転する裁断下刃１０と上刃回転モータ２５の駆動により回転する裁断上刃２０との間を通って上記搬送方向（図中矢印Ｈ方向）に裁断される。
【００２４】
なお、図３に示すように、この塗工シート裁断装置は、塗工シート３０を裁断する際に、塗工シート３０が裁断下刃１０の外周１２に接触する接触領域Ｒ１内に裁断上刃２０と塗工シート３０との接触開始位置Ｐ１を位置させるとともに、裁断下刃１０と裁断上刃２０とが互いに重なるようにしてこの塗工シート３０を裁断する。
【００２５】
なお、接触領域Ｒ１は、塗工シート３０の裁断下刃１０への接触が始まる接触開始位置Ｅ１から塗工シート３０の裁断下刃１０への接触が終わる接触終了位置Ｆ１までの領域であり、接触開始位置Ｐ１は、塗工シート３０と裁断上刃２０とが接触する位置のうちの、上記搬送方向の最も上流側の位置である。したがって、裁断下刃１０の回転軸線Ｃ１および接触開始位置Ｅ１を通る直線と搬送方向上流側に延びる塗工シート３０との成す角度は９０度となり、上記回転軸線Ｃ１および接触終了位置Ｆ１を通る直線と搬送方向下流側に延びる塗工シート３０との成す角度も９０度となる。
【００２６】
上記裁断下刃１０と裁断上刃２０との間を通って搬送方向に裁断された塗工シート３０は、シート引出ローラ部４４を通って、上記パスロール４５Ａからパスロール４５Ｃを経由し、シート切断供給ローラ部４６の２つの搬送ローラ４６Ａ、４６Ｂの間に挟まれてシート切断部５０に供給される。そして、シート切断部５０が、上記供給された塗工シート３０を上記搬送方向と直交する方向に切断する。
【００２７】
以下、塗工シート３０を裁断する際の裁断品質とオーバーラップ量との関係について説明する。図４は裁断下刃と裁断上刃の寸法および上記両刃の位置関係の詳細を示す断面図である。なお、上記図４は、図３と同様の断面を図３と同様の方向から見た図である。
【００２８】
なお、図４に示すように、ここでは裁断下刃１０の外径Ｄ１を１１０ｍｍ、裁断上刃の外径Ｄ２を１３８ｍｍ、裁断下刃１０と裁断上刃２０の一部分とが互いに重なる量を、すなわち、上記両刃の回転軸線Ｃ１、Ｃ２を結ぶ線上において両刃が上記回転軸線方向に互いに重なる長さをオーバーラップ量Ｗとする。また、裁断上刃２０と裁断下刃１０とが上記回転軸線方向に重なる上記搬送方向の最も上流側の位置を位置Ｊとし、この位置Ｊにおける裁断下刃１０の接線Ｓ１と位置Ｊにおける裁断上刃２０の接線Ｓ２との成す角度を切込挟み角αとする。なお、この切込挟み角αは、裁断下刃１０と裁断上刃２０とが上記回転軸線方向に互いに重なる領域Ｇを含む側に対向する側の角度である。なお、上記オーバーラップ量Ｗの０．５ｍｍから２ｍｍまでの変化に応じて、切込挟み角αは１０．４度から２０．７度まで変化する。
【００２９】
上記オーバーラップ量Ｗおよび切込挟み角αと裁断品質との関係を表１に示す。
【００３０】
【表１】

オーバーラップ量Ｗが２．０ｍｍおよび１．７ｍｍ、すなわち切込挟み角αが２０．７度および１９．１度の場合には、塗工シート３０の裁断によって塗工層３１にひび割れおよびキズが多数発生し、表１に示すように裁断品質が低く切り出された塗工シートは製品として採用可能なレベルに達していない。すなわち、裁断の際に、裁断上刃による塗工シートの押し曲げ量が大きくなり、塗工シートが局部的に大きく変形して塗工層内に大きな応力が発生するので、塗工層に多数のひび割れやキズが生じる。
【００３１】
オーバーラップ量Ｗが１．５ｍｍ、すなわち切込挟み角αが１８．０度の場合には、表１に示すように、ひび割れ、キズが多少発生するが品質の低下は少なく、切り出された塗工シートは製品として採用可能なレベルである。すなわち、裁断上刃による塗工シートの押し曲げ量が小さくなり、塗工シートの局部的な変形が小さくなるので、塗工層おいてひび割れやキズを生じさせるような大きな応力の発生を防ぐことができる。
【００３２】
オーバーラップ量Ｗが１．３ｍｍ、すなわち切込挟み角αが１６．７度の場合には、表１に示すように、ひび割れが多少残るがキズは無くなり、上記オーバーラップ量Ｗが１．５ｍｍの場合に比してさらに裁断品質が良くなる。
【００３３】
オーバーラップ量Ｗが１．０ｍｍ、０．７ｍｍ、０．５ｍｍすなわち切込挟み角αが１４．７度、１２．３度１０．４度、の場合には、表１に示すように、ひび割れ、キズが共に無くなり裁断品質は非常に良好となる。
【００３４】
上記実施の形態においては、塗工シートをインクジェット用の記録紙としたが、この場合に限らず、炭酸カルシウム、アルミナ水和物、あるいはシリカ等の無機材料を主成分とする微粒子を樹脂バインダ等で結合した塗工層を、紙、フィルム、樹脂被覆紙等の支持体上に積層して形成した塗工シートであれば上記と同様の効果を得ることができる。
【００３５】
また、塗工シートが、曲げ等の外力により容易に微粒子同士の結合が解かれて割れが生じてしまう特徴を持つフォト光沢タイプのインクジェット用紙の場合には、上記裁断品質の低下を防ぐ顕著な効果を奏することができる。
【００３６】
また、裁断上刃の径、裁断下刃の径、搬送速度等の裁断条件を変更したり、塗工シートおよび塗工層の厚さを変更しても裁断品質の変化は少なく、塗工シート中の裁断下刃の外周に接触する接触領域内に裁断上刃と塗工シートとの接触開始位置を位置させて裁断を行う場合には、上記オーバーラップ量Ｗが上記裁断品質の良否を決める主要因の１つとなっていることは別途確認している。
【００３７】
なお、上記塗工シートおよび塗工層の厚さの変更においては、塗工層の厚さは０．０１ｍｍから０．１ｍｍまで変更し、この塗工層の厚さを含めた塗工シートの厚さは０．１ｍｍから０．５ｍｍまで変更した。
【図面の簡単な説明】
【図１】本発明の塗工シート裁断方法を実施するための塗工シート裁断装置の概略構成を示す側面図
【図２】裁断下刃と裁断上刃と塗工シートとの位置関係を一部断面で示した拡大正面図
【図３】図２の３−３断面を示す図
【図４】裁断下刃と裁断上刃の寸法および互いの位置関係の詳細を示す断面図
【符号の説明】
１０裁断下刃
２０裁断上刃
３０塗工シート
３１塗工層
４０搬送部
Ｃ１裁断上刃の回転軸線
Ｃ２裁断上刃の回転軸線
θ１裁断下刃の刃先角
θ２裁断上刃の刃先角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating sheet cutting method and apparatus, and more particularly, to a coating sheet cutting method and apparatus for cutting a coating sheet through a coating sheet between opposing disc-shaped cutting blades.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a coating sheet is known in which a coating layer in which silica fine particles or the like are bonded with a resin binder is laminated on a sheet-like support such as paper, film, or resin-coated paper. After the coating sheet is manufactured as a raw material coated with a coating liquid for forming a coating layer on a long support that is continuously conveyed, dried and wound into a roll, this roll The paper is pulled out from the original sheet and is cut along the transport direction while being transported, or cut in a direction perpendicular to the transport direction, and cut into a desired size to be commercialized as information recording paper. The shear cutting method is generally used for cutting in the transport direction. In this shear cutting method, a disc-shaped cutting upper blade having a sharp edge angle and a disk-shaped cutting with a cutting edge angle close to a right angle. The coating sheet is cut by rotating the cutting upper blade and the cutting lower blade while passing the coated sheet conveyed between the blades (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-260077 [0004]
[Problems to be solved by the invention]
However, when various materials are used for the coating layer in accordance with the demand for manufacturing the coating sheet in various modes, the roll-shaped coating sheet is pulled out and cut in the transport direction. It is difficult to set appropriate cutting conditions, and if the cutting conditions are inappropriate, there is a problem that cracks and scratches occur in the coating layer near the cut end. In particular, when the coating layer is hard and fragile, the above cracks and scratches are prominent.
[0005]
The present invention has been made in view of the above circumstances, and suppresses the generation of cracks and scratches in the coating layer when cutting a coating sheet, thereby preventing a reduction in cutting quality. An object of the present invention is to provide a sheet cutting method and apparatus.
[0006]
[Means for Solving the Problems]
The coating sheet cutting method of the present invention comprises a disc-shaped cutting lower blade and a disk-shaped cutting upper blade having a blade edge angle smaller than the cutting edge angle of the cutting lower blade and facing the cutting lower blade. The coating layer side of the coating sheet having the coating layer is arranged so that the rotation axes of the two blades are parallel to each other and the blades are partially overlapped with each other in the direction in which the rotation axis extends. The coating sheet is conveyed in the conveying direction perpendicular to the rotation axis while passing the coating sheet between the two blades while the surface opposite to the outer periphery of the cutting lower blade is in contact, and the coating sheet is cut in the conveying direction. This is a method for cutting a coated sheet, and when cutting a coated sheet, the contact start position between the cut upper blade and the coated sheet is positioned in a contact area that contacts the outer periphery of the cut lower blade in the coated sheet. , Overlap amount where part of the two blades overlap each other It is characterized in that as a 1.5mm or less cutting the coated sheet.
[0007]
The coating sheet cutting device of the present invention is a disk-shaped cutting lower blade, and a disk-shaped cutting upper blade having a cutting edge angle smaller than the cutting edge angle of the cutting lower blade and facing the cutting lower blade. A cutting upper blade having a rotation axis parallel to the rotation axis of the cutting lower blade and disposed so that a part of the cutting lower blade and a part of the cutting upper blade overlap each other in the direction in which the rotation axis extends. The coating sheet is passed between both blades while rotating the both blades while bringing the surface opposite the coating layer side of the coating sheet having the coating layer into contact with the outer periphery of the cutting lower blade. A coating sheet cutting device that transports in the transport direction perpendicular to the rotation axis and cuts the coating sheet in the transport direction, and cuts the coating sheet into a contact area that contacts the outer periphery of the cutting lower blade in the coating sheet. The contact start position between the blade and the coating sheet is located, and a part of the both blades Overlap amount of overlap is characterized in that it is 1.5mm or less.
[0008]
The “amount of overlap where a part of both blades overlap each other” means a length included in a region where the both blades overlap each other on a line passing through the rotation axis of each of the blades when viewed from the direction of the rotation axis. It is.
[0009]
The coating sheet is, for example, a paper, a film, a resin-coated paper, or the like formed by bonding fine particles mainly composed of an inorganic material such as calcium carbonate, alumina hydrate, or silica with a resin binder or the like. It can be laminated on the support.
[0010]
The coating sheet can be an inkjet recording paper. Inkjet recording paper has a coating layer formed by bonding fine particles mainly composed of silica or the like with a resin binder made of polyvinyl alcohol or the like on a support such as paper, film, or resin-coated paper. Laminated. In particular, photo-glossy type inkjet paper has a small amount of binder to which fine particles such as silica are bonded in order to improve ink absorbability, so that the fine particles are easily broken and broken by an external force such as bending. It has the characteristic that will occur.
[0011]
The "contact start position between the coating sheet and the cutting upper blade" means that the coating sheet is conveyed out of the positions where the coating sheet and the cutting upper blade come into contact when the coating sheet is cut. This means the most upstream position in the transport direction.
[0012]
【The invention's effect】
According to the coating sheet cutting method and apparatus of the present invention, when cutting a coating sheet having a coating layer, the cutting upper blade and the coating blade are brought into contact with the outer periphery of the cutting lower blade in the coating sheet. Since the position of starting contact with the work sheet is positioned and the coating sheet is cut so that the overlap amount where both blades partially overlap each other is 1.5 mm or less, when cutting the coating sheet The amount by which the cutting upper blade pushes and bends the coated sheet can be reduced, and the local deformation of the coated sheet can be kept small. Thereby, in the cutting of a coating sheet, generation | occurrence | production of the big stress which causes a crack and a crack to a coating layer can be suppressed, and the fall of the said cutting quality can be prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a coating sheet cutting apparatus for carrying out the coating sheet cutting method of the present invention, and FIG. 2 is a partial cross-sectional view showing the positional relationship between a cutting lower blade and a cutting upper blade. FIG. 3 is an enlarged front view, and FIG. 3 is a view showing a section 3-3 in FIG.
[0014]
The illustrated coating sheet cutting apparatus includes a disk-shaped cutting lower blade 10, a lower blade rotating motor 15 that rotates the cutting lower blade 10, a disk-shaped cutting upper blade 20 that faces the cutting lower blade 10, and a cutting upper blade. An upper blade rotation motor 25 that rotates 20 and a transport unit 40 that transports a long coating sheet 30 are provided.
[0015]
The coating sheet 30 is formed by laminating a coating layer 31 in which fine particles mainly composed of silica are bonded with a resin binder made of polyvinyl alcohol or the like on a support 32 made of resin-coated paper or the like. 30 is supplied from the sheet roll 35 which is the raw material wound by roll shape. The coating sheet 30 is an inkjet recording paper, and the support 32 may be a paper or a film in addition to the resin-coated paper. The coating layer 31 may be the support. Harder than 32 and fragile.
[0016]
As shown in FIGS. 2 and 3, the lower cutting blade 10 and the upper cutting blade 20 are rotated so that the rotation axis C1 of the lower cutting blade 10 and the rotation axis C2 of the upper cutting blade 20 are parallel to each other. The cutting lower blade 10 and a part of the cutting upper blade 20 overlap each other in the direction in which the axis C1 and the rotation axis C2 extend, that is, a part of the cutting lower blade 10 when viewed from the direction in which the rotation axes C1 and C2 extend. The cutting upper blade 20 is disposed so as to overlap with a part of the cutting upper blade 20 (see FIG. 3), and the cutting edge angle θ2 of the cutting upper blade 20 is smaller than the cutting edge angle θ1 of the cutting lower blade 10.
[0017]
The lower cutting blade 10 is fitted to the outer periphery of the lower blade shaft 16 connected to the rotation shaft of the lower blade rotation motor 15, and the lower blade spacer 17 A and the lower blade are fitted to the outer periphery of the lower blade shaft 16. It is sandwiched between the spacer 17B and rotates integrally with the lower blade shaft 16.
[0018]
The cutting upper blade 20 is fitted to the outer periphery of the upper blade shaft 26 connected to the rotation shaft of the upper blade rotation motor 25, and the upper blade spacer 27A and the upper blade are fitted to the outer periphery of the upper blade shaft 26. It is sandwiched between the spacer 27B and rotates integrally with the upper blade shaft 26.
[0019]
The conveyance unit 40 includes a roll holding shaft 41 that rotatably holds the sheet roll 35 on a rotation shaft, a sheet drawing roller unit 44 that pulls the coating sheet 30 from the sheet roll 35 held on the roll holding shaft 41, and a roll It is arranged in the conveyance path of the coating sheet 30 from the holding shaft 41 to the sheet drawing roller unit 44, and changes the conveyance direction of the coating sheet 30 or appropriately applies the tensile force (tension) in the conveyance direction received by the coating sheet 30. Coating that is pulled out by the sheet pulling roller section 44 and cut between the cut lower blade 10 and the cut upper blade 20 by the pass rolls 42A, 42B, 42C and the pass rolls 43A, 43B, 43C, 43D to be maintained. A sheet cutting supply roller unit 46 that supplies the sheet 30 to the sheet cutting unit 50, a sheet drawing roller unit 44, and a sheet cutting supply roller unit 4 Pass rolls 45A to coated sheet 30 to change the conveying direction of the arranged coated sheet 30 is properly maintained or tensile force in the conveying direction (tension) experienced during have 45B, and 45C. The position at which the coating sheet 30 is cut between the lower cutting blade 10 and the upper cutting blade 20 is in the conveyance path between the pass roll 43D and the sheet drawing roller unit 44.
[0020]
The sheet drawing roller section 44 sandwiches the coating sheet 30 between the two

rotating rollers

44A and 44B, and pulls the coating sheet 30 from the sheet roll 35 and conveys it. The sheet cutting supply roller unit 46 passes the coating sheet 30 between the two

rollers

46A and 46B that rotate intermittently so that the sheet cutting unit 50 performs predetermined cutting of the coating sheet 30. The sheet 30 is supplied to the sheet cutting unit 50.
[0021]
In addition, the said conveyance part 40 makes the coating sheet 30 contact the outer peripheral surface 12 of the cutting lower blade 10 while the surface of the support body 32 side which is the surface on the opposite side to the coating layer 31 side of the coating sheet 30 is made to contact. Is passed between the lower cutting blade 10 and the upper cutting blade 20 and conveyed in the conveying direction H perpendicular to the rotational axis C1. Further, the sheet cutting unit 50 cuts the coating sheet 30 supplied through the sheet cutting supply roller unit 46 in a direction orthogonal to the direction in which the coating sheet 30 is conveyed.
[0022]
Next, the cutting of the coating sheet 30 by the coating sheet cutting apparatus will be described in detail.
[0023]
The coated sheet 30 is sandwiched between the two

transport rollers

44A and 44B of the sheet pull-out roller unit 44 and is pulled out from the sheet roll 35 and transported. The coating sheet 30 passes through the pass roll 43 D from the pass roll 42 A and between the cut lower blade 10 that is rotated by driving the lower blade rotation motor 15 and the upper cut blade 20 that is rotated by driving the upper blade rotation motor 25. It cuts in the said conveyance direction (arrow H direction in a figure) through.
[0024]
As shown in FIG. 3, when the coating sheet cutting device cuts the coating sheet 30, the cutting upper blade is in the contact region R 1 where the coating sheet 30 contacts the outer periphery 12 of the cutting lower blade 10. The coating sheet 30 is cut so that the contact start position P1 between the cutting sheet 20 and the coating sheet 30 is positioned, and the lower cutting blade 10 and the upper cutting blade 20 overlap each other.
[0025]
The contact region R1 is a region from a contact start position E1 at which the contact of the coating sheet 30 to the cutting lower blade 10 starts to a contact end position F1 at which the contact of the coating sheet 30 to the cutting lower blade 10 ends. The contact start position P1 is a position on the most upstream side in the transport direction among positions where the coating sheet 30 and the cutting upper blade 20 are in contact with each other. Therefore, the angle formed by the straight line passing through the rotation axis C1 and the contact start position E1 of the cutting lower blade 10 and the coating sheet 30 extending upstream in the conveying direction is 90 degrees, and the straight line passing through the rotation axis C1 and the contact end position F1. And the coating sheet 30 extending downstream in the conveying direction is also 90 degrees.
[0026]
The coated sheet 30 cut in the conveying direction between the lower cutting blade 10 and the upper cutting blade 20 passes through the sheet drawing roller portion 44 and passes from the pass roll 45A to the pass roll 45C to supply the sheet. The sheet is sandwiched between the two conveying rollers 46 A and 46 B of the roller unit 46 and supplied to the sheet cutting unit 50. Then, the sheet cutting unit 50 cuts the supplied coating sheet 30 in a direction orthogonal to the transport direction.
[0027]
Hereinafter, the relationship between the cutting quality and the overlap amount when cutting the coated sheet 30 will be described. FIG. 4 is a cross-sectional view showing details of the dimensions of the lower cutting blade and the upper cutting blade and the positional relationship between the two blades. Note that FIG. 4 is a cross-sectional view similar to that of FIG. 3 viewed from the same direction as FIG.
[0028]
As shown in FIG. 4, here, the outer diameter D1 of the cutting lower blade 10 is 110 mm, the outer diameter D2 of the cutting upper blade is 138 mm, and the amount by which the cutting lower blade 10 and a part of the cutting upper blade 20 overlap each other, That is, the overlap amount W is a length in which the two blades overlap each other in the rotation axis direction on the line connecting the rotation axes C1 and C2 of the both blades. Further, the most upstream position in the transport direction in which the upper cutting blade 20 and the lower cutting blade 10 overlap in the rotational axis direction is defined as a position J, and the tangent S1 of the cutting lower blade 10 at the position J and the upper cutting at the position J An angle formed by the tangent line S2 of the blade 20 is defined as a cutting angle α. The cutting angle α is an angle on the side facing the side including the region G where the cutting lower blade 10 and the cutting upper blade 20 overlap each other in the rotational axis direction. In addition, according to the change of the overlap amount W from 0.5 mm to 2 mm, the cut angle α changes from 10.4 degrees to 20.7 degrees.
[0029]
Table 1 shows the relationship between the overlap amount W and the cut angle α and the cutting quality.
[0030]
[Table 1]

When the overlap amount W is 2.0 mm and 1.7 mm, that is, the cutting angle α is 20.7 degrees and 19.1 degrees, the coating layer 31 is cracked and scratched by the cutting of the coating sheet 30. A large number of coated sheets cut out with low cutting quality as shown in Table 1 have not reached a level that can be used as products. That is, when cutting, the amount of pushing and bending of the coating sheet by the cutting upper blade is increased, and the coating sheet is greatly deformed locally and a large stress is generated in the coating layer. Cracks and scratches occur.
[0031]
When the overlap amount W is 1.5 mm, that is, the incision angle α is 18.0 degrees, as shown in Table 1, cracks and scratches are slightly generated, but the quality is hardly deteriorated and the cut coating is removed. The engineering sheet is at a level that can be adopted as a product. That is, the amount of pushing and bending of the coated sheet by the cutting upper blade is reduced, and the local deformation of the coated sheet is reduced, thereby preventing the generation of large stresses that cause cracks and scratches in the coating layer. Can do.
[0032]
When the overlap amount W is 1.3 mm, that is, when the cutting angle α is 16.7 degrees, as shown in Table 1, some cracks remain, but there are no scratches, and the overlap amount W is 1.5 mm. Compared with the case, the cutting quality is further improved.
[0033]
As shown in Table 1, when the overlap amount W is 1.0 mm, 0.7 mm, 0.5 mm, that is, the cutting angle α is 14.7 degrees, 12.3 degrees 10.4 degrees, Both scratches disappear and the cutting quality is very good.
[0034]
In the above embodiment, the coated sheet is an inkjet recording paper. However, the present invention is not limited to this, and fine particles mainly composed of an inorganic material such as calcium carbonate, alumina hydrate, or silica are used as a resin binder. As long as the coating sheet is formed by laminating the coating layer bonded in step 1 on a support such as paper, film or resin-coated paper, the same effects as described above can be obtained.
[0035]
Further, in the case of a photo glossy type ink jet sheet having a feature that the coating sheet is easily broken by the external force such as bending to cause breakage of the fine particles, the above-described remarkable reduction in cutting quality is prevented. There is an effect.
[0036]
In addition, even if the cutting conditions such as cutting upper blade diameter, cutting lower blade diameter, transport speed, etc. are changed or the thickness of the coating sheet and coating layer is changed, the cutting quality will not change much, and the coating sheet When cutting is performed by positioning the contact start position between the upper cutting blade and the coating sheet in the contact area that contacts the outer periphery of the inner cutting lower blade, the overlap amount W determines the quality of the cutting quality. It has been confirmed separately that it is one of the main factors.
[0037]
In the change of the thickness of the coating sheet and the coating layer, the thickness of the coating layer is changed from 0.01 mm to 0.1 mm, and the coating sheet including the thickness of the coating layer is changed. The thickness was changed from 0.1 mm to 0.5 mm.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of a coating sheet cutting apparatus for carrying out a coating sheet cutting method of the present invention. FIG. 2 shows a positional relationship among a cutting lower blade, a cutting upper blade, and a coating sheet. FIG. 3 is a sectional view showing a section 3-3 in FIG. 2. FIG. 4 is a sectional view showing details of the dimensions of the lower cutting blade and the upper cutting blade and their positional relationship. ]
DESCRIPTION OF SYMBOLS 10 Cutting lower blade 20 Cutting upper blade 30 Coating sheet 31 Coating layer 40 Transport part C1 Cutting upper blade rotation axis C2 Cutting upper blade rotation axis θ1 Cutting lower blade edge angle θ2 Cutting upper blade edge angle

Claims

A disk-shaped cutting lower blade and a disk-shaped cutting upper blade that has a cutting edge angle smaller than the cutting edge angle of the cutting lower blade and faces the cutting lower blade, so that the rotation axes of both blades are parallel, And it arrange | positions so that a part of said both blades may mutually overlap in the direction where this rotation axis extends.
While rotating the both blades, the coating sheet is passed between the blades while contacting the outer surface of the cutting lower blade with the surface opposite to the coating layer side of the coating sheet having the coating layer. A coating sheet cutting method for transporting in a transport direction perpendicular to the rotation axis and cutting the coating sheet in the transport direction,
When cutting the coating sheet, the contact start position between the cutting upper blade and the coating sheet is located in a contact area that contacts the outer periphery of the cutting lower blade in the coating sheet, and A coating sheet cutting method, wherein the coating sheet is cut so that an overlap amount in which both blades partially overlap each other is 1.5 mm or less.

The coating sheet cutting method according to claim 1, wherein the coating sheet is an inkjet recording paper.

A disc-shaped cutting lower blade,
A disc-shaped cutting upper blade having a cutting edge angle smaller than the cutting edge angle of the cutting lower blade and facing the cutting lower blade, having a rotation axis parallel to the rotation axis of the cutting lower blade; and A cutting upper blade disposed so that a portion of the cutting lower blade and a portion of the cutting upper blade overlap each other in the direction in which the rotation axis extends,
While rotating the both blades, the coating sheet is passed between the two blades while contacting the outer surface of the cutting lower blade with the surface opposite to the coating layer side of the coating sheet having the coating layer. A coating sheet cutting device that transports in the transport direction orthogonal to the rotation axis and cuts the coating sheet in the transport direction,
The contact start position of the upper cutting blade and the coating sheet is located in a contact area in contact with the outer periphery of the lower cutting blade in the coating sheet, and an overlap amount in which a part of the both blades overlap each other. A coating sheet cutting apparatus characterized by being 1.5 mm or less.

4. The coated sheet cutting apparatus according to claim 3, wherein the coated sheet is an inkjet recording paper.