JP4689109B2

JP4689109B2 - Shape holder

Info

Publication number: JP4689109B2
Application number: JP2001268041A
Authority: JP
Inventors: 智次阿部; 正明福安
Original assignee: Kyowa Ltd
Current assignee: Kyowa Ltd
Priority date: 2001-08-01
Filing date: 2001-08-01
Publication date: 2011-05-25
Anticipated expiration: 2021-08-01
Also published as: JP2003040322A

Description

【０００１】
【発明の属する技術分野】
本発明は、シート状物または袋状物の形状を保持するための形状保持体に関する。
【０００２】
なお、本明細書において「変形形状保持状態」とは、外力が作用しなくなっても元の形状に戻らず、概ねそのままの形状を保持した状態を指すものとする。
【０００３】
【従来の技術】
従来、軟銅やアルミニウム等の金属線材を芯材とし、この芯材を細長いビニルテープや樹脂フィルム等の被覆材で挟んで接着したものがシート状物または袋状物の緊縛材、あるいは結束材として用いられている。これら緊縛材、あるいは結束材は、容易に切断でき、手指で容易に折り曲げたり、捻ったりでき、その上、塑性変形特性を有する金属線材を芯材としているため、折り曲げたり、捻ったりした後、外力が作用しなくなっても元の形状に戻らずそのままの形状を保持し、かつ、捻った時の結束性に優れている。
【０００４】
【発明が解決しようとする課題】
しかしながら、上述の金属線材を芯材としたものは、大量生産される食品の包装に用いようとすると、最終段階で行われる金属探知器による異物混入検査で反応するため、最終の安全確認ができなくなるという問題があるとともに、廃棄時の焼却処理において残さを生じてしまうという問題があった。
【０００５】
このような金属線材を芯材とした結束材の問題点に対処するため、金属線材の代わりに１本の樹脂性線材を芯材とした結束材も提案されているが、変形形状保持状態を保つ特性、すなわち、塑性変形性能（賦型性能）と変形形状保持性能（賦型保持性能）、および結束性が十分であるとはいえない場合があった。
【０００６】
また、プラスチック樹脂に賦型性付与剤を配合した単一樹脂のみからなる構成の薄板状の結束材も提案されているが、変形形状保持状態を保つ特性が十分であるとはいえない場合があった。
【０００７】
そこで本発明は、上記課題を解決するために、変形形状保持状態を保つ特性、すなわち、塑性変形性能（賦型性能）と変形形状保持性能（賦型保持性能）を増した形状保持体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】
上記目的を達成するため本発明の形状保持体は、可塑性を有する芯材が、樹脂からなる２枚の被覆材の間に挟み込まれて保持されており、前記芯材の塑性変形により変形形状保持状態を保つことができる形状保持体において、
【０００９】
前記芯材が２００ＭＰａ以上の破断強度を有し、熱可塑性樹脂からなる前記芯材の形状が帯形状であることを特徴とする。
【００１０】
また、本発明の形状保持体は、可塑性を有する芯材が、前記芯材の融点以上の融点を有する樹脂からなる２枚の被覆材の間に挟み込まれて保持されており、前記芯材の塑性変形により変形形状保持状態を保つことができる形状保持体において、
【００１１】
前記芯材が２００ＭＰａ以上の破断強度を有し、前記各被覆材間に、樹脂からなる複数の前記芯材が挟み込まれていることを特徴とする。
【００１２】
上述の通り構成された本発明の形状保持体は、樹脂からなる複数の芯材を有することで、樹脂からなる一本の芯材の構成の結束材に比べて高い変形形状保持状態を保つ特性および結束力を得ることができる。
【００１３】
さらに、本発明の形状保持体は、可塑性を有する芯材と、前記芯材を保持し、樹脂からなる被覆材とを有し、前記芯材の塑性変形により変形形状保持状態を保つことができる形状保持体において、
【００１４】
前記芯材が２００ＭＰａ以上の破断強度を有し、前記芯材が、幅方向の両側端を折り返して袋とじされた１枚の前記被覆材の間に保持されていることを特徴とする。
【００１５】
また、本発明の形状保持体は、２枚の被覆材のうち、一方の被覆材の幅方向の両側部が、他方の被覆材の幅方向の両側端を包み込むように折り返されているものであってもよい。
【００１６】
また、本発明の形状保持体は、被覆材が、複数の層が積層されてなるものであるものであってもよいし、芯材が、０．０５ｍｍ²〜１．０ｍｍ²の断面積を有するものであってもよいし、芯材が、５０００ＭＰａ以上の引張り弾性率を有するものであってもよい。
【００１７】
さらに、本発明の形状保持体は、各層が、熱可塑性樹脂からなる層、熱可塑性樹脂が混合された紙からなる層、紙からなる層、金属箔からなる層よりなる群より選ばれる層を含むものであってもよい。
【００１８】
また、本発明の形状保持体は、各被覆材の互いに対向する各対向面を形成するそれぞれの層が、熱可塑性樹脂からなる層、あるいは熱可塑性樹脂が混合された紙からなる層の場合、各対向面同士を溶融接合させているものであってもよいし、各被覆材の互いに対向する各対向面を形成するそれぞれの層が、紙からなる層、あるいは金属箔からなる層の場合、各対向面同士を接着剤、粘着剤、あるいは接着性フィルムで接合させているものであってもよい。
【００１９】
また、本発明の形状保持体は、所定の材質からなる芯材を少なくとも１つ含むものであってもよい。
【００２０】
さらに、本発明の形状保持体は、芯材の表面を溶融させて、芯材を被覆材に溶融接合させているものであってもよいし、芯材の表面を溶融させて、芯材を接着剤、粘着剤、あるいは接着性フィルムに溶融接合させているものであってもよい。
【００２１】
【発明の実施の形態】
次に、本発明の実施の形態について図面を参照して説明する。
【００２２】
図１に本発明における形状保持体の一実施形態の模式的な断面図を、また図２に図１に示した形状保持体の斜視図をそれぞれ示す。
【００２３】
本実施形態の形状保持体１は、２枚の被覆材２の間に、可塑性を有する樹脂からなる３本の芯材３が挟み込まれた構成となっている。
【００２４】
各芯材３は、ポリオレフィン樹脂（ポリエチレン樹脂、ポリプロピレン樹脂を含む）、ポリアミド樹脂、ポリブチレンテレフタレート樹脂、ポリエチレンテレフタレート樹脂、生分解性ポリマー等の１種または２種以上からなる結晶性熱可塑性合成樹脂と、ガラス繊維、タルク、マイカ、炭酸カルシウム、水酸化マグネシウム、アルミナ、酸化亜鉛、酸化マグネシウム、水酸化アルミニウム、シリカアルミナ、酸化チタン、酸化カルシウム、珪酸カルシウム、塩基性炭酸マグネシウム、炭素繊維、カーボンブラック等の無機充填材とからなる。なお、各芯材３は、可塑性を有する樹脂であれば上述した材料に限定されるものではない。
【００２５】
各被覆材２はその融点が芯材３の融点以上であり、その材質は、芯材３の材質としてポリエチレンを用いた場合、ポリエチレンと熱融着するポリマーであることが好ましい。
【００２６】
また、この他、各被覆材２の材質としてはＰＶＣ、ＰＥ、ＰＥＴ等の熱可塑性フィルムや、紙も好適であるが、これらに限定されるものではない。
【００２７】
さらに、被覆材２は、図１に示すように単一の層で形成されてもよいが、図３に示すように、複数の層で形成されているものであってもよい。また、図３（ａ）、図３（ｂ）に示すように２枚の被覆材２を用いる場合には、２枚の被覆材２がともに複数の層で形成されているものであってもよいし、図面は省略したが、２枚の被覆材２のうち、いずれか一方が複数の層で形成されるものであってもよい。このように、複数の層で形成されている場合、各層は熱可塑性樹脂からなる層、熱可塑性樹脂が混合された紙からなる層、紙からなる層、不織布からなる層、金属箔からなる層を含むものであってもよい。例えば、図３（ａ）において、第１の層２ｃが熱可塑性樹脂からなる層、あるいは熱可塑性樹脂が混合された紙からなる層、第２の層２ｄがアルミニウム等の金属箔からなる層とするものであってもよい。
【００２８】
各被覆材２の互いに対向する各内面２ａを形成するそれぞれの層である第１の層２ｃが、熱可塑性樹脂からなる層、あるいは熱可塑性樹脂が混合された紙からなる層の場合、各内面２ａ同士を溶融接合させることができる。
【００２９】
また、各被覆材２の第１の層２ｃが、紙からなる層、あるいは金属箔からなる層の場合は、図３（ｂ）に示すように、各被覆材２を張り合わせ、かつ、芯材３を固定保持するための接合層２ｆが第１の層２ｃ上に設けられているものであってもよい。この接合層２ｆは、接着剤、粘着剤、接着性フィルム、あるいは粘着性フィルム等、各被覆材２の張り合わせおよび芯材３の固定保持が可能なものであればいかなるものであってもよい。この接合層２ｆは、第１の層２ｃが熱可塑性樹脂からなる層、あるいは熱可塑性樹脂が混合された紙からなる層の場合に、より強固な接合を得るために形成されているものであってもよい。
【００３０】
次に、芯材３の形状・性能について説明する。
【００３１】
本実施形態の芯材３は略０．０５ｍｍ^２〜１．０ｍｍ^２の断面積を有する熱可塑性樹脂を主ポリマーとする延伸線状物である。なお、本実施形態の芯材３の形状は必ずしも断面が円形状の線材ばかりでなく、楕円形でも角形でもよく、要は塑性変形性を有する線材であればどのような形状であってもよい。例えば、図４に示すように、形状保持体は、断面が角形の、テープ状、あるいはリボン状の帯形状芯材３ａを芯材として有する形態であってもよい。
【００３２】
また、本実施形態の芯材３はその破断強度が２００Ｍｐａ以上の高強度である。また、その引張り弾性率が５０００ＭＰａ以上の高弾性率を有する延伸線状物であることが望ましい。これは、限りなく金属線に近い賦型性能を得るためには破断強度をできる限り高く持っていく必要があるためであり、発明者らの実験によれば良好な賦型性を得るためには２００Ｍｐａ以上の強力が好ましい。一方５０００ＭＰａ以上の引張り弾性率は繰り返し屈曲が要求される場合に線材の折損等を防ぐことができる。
【００３３】
次に、本実施形態における形状保持体の他の例の拡大断面図を図５および図６に示す。
【００３４】
図５に示す形状保持体は、芯材３が２枚の第１の被覆材２０ａ、第２の被覆材２０ｂの間に挟み込まれて保持されており、かつ第２の被覆材２０ｂの幅方向の両側部２２が、第１の被覆材２０ａの幅方向の両側端部を包み込むように折り返された形態となっている。
【００３５】
図６に示す形状保持体は、１枚の被覆材２のみの袋とじによって芯材３を保持する形態となっている。すなわち、被覆材２の幅方向の第２の側端部２４ｂが内側になるようにして第１の側端部２４ａを折り返すことで１枚の被覆材２が袋とじされており、この１枚の被覆材２の間に芯材３が保持されている。
【００３６】
本実施形態はより高度な変形形状保持状態を保つ特性、すなわち、塑性変形性能（賦型性能）とより強固な変形形状保持性能（賦型保持性能）を付与するため、高強度張力をもつ熱可塑性樹脂を線状化することによりその絶対容積を小さくして塑性変形が容易でかつ大きい芯材３を得ると共にこの芯材３と柔軟な被覆材２を組み合わせて用いることにより形状保持体１として必要な一定の幅形状を付与すると同時に塑性変形性能を損なうことなくより強固な変形形状保持性能を得るという全く新しい形状の保持体１を見出すに至ったのである。
【００３７】
なお、用いる芯材３の太さや本数は要求される塑性変形力と変形形状保持力の程度により定めることができる。すなわち、大きな塑性変形力を要したとしても、大きな変形形状保持力が必要な場合は芯材３の本数を増やすか、線径を太くし、逆に小さな塑性変形力での変形（賦型）が必要な場合は少数本にするか細い線径の芯材を用いる。あるいは、形状保持体１の利用用途によっては、芯材の形状が図４に示したように帯形状とするものであってもよい。
【００３８】
次に、図３（ｂ）に示されるような、上下２枚の被覆材２が第１の層２ｃと第２の層２ｄと接合層２ｆとの３層構造からなる形状保持体１を例に取り、その製造方法の一例を説明する。
【００３９】
芯材３は芯材３の表面が十分に溶融する程度の温度に設定された予備加熱槽を通過した後、被覆材２同士及び被覆材２と芯材３を接着するに十分な温度に加熱された加熱圧着ロールに送られ、同ロール間にて被覆材２に挟み込まれた状態で強く圧着される。これにより、被覆材２同士及び被覆材２と芯材３が圧着され、両被覆材２間に３本の芯材３を並列に保持した形状保持体１が形成される。なお、被覆材２の間に保持された各芯材３は、各芯材３自体が被覆材２に上下から圧着されることで被覆材２間に保持されるものであってもよいが、図３のように、各芯材３が被覆材２に上下より圧着されるばかりではなく、各被覆材２同士及び各芯材３同士をも同時に圧着させるものであってもよい。この場合、これらの接着をより強固にするために、熱可塑性樹脂フィルムからなる第１の層２ｃ上の接合層２ｆをフィルム状の接着性フィルムのかわりに芯材３とよく接着する接着剤が塗布されているものであってもよい。
【００４０】
なお、本実施形態では、一例として３本の芯材３を有する形状保持体１を図１に示しているが、芯材３の本数は、用途に応じて、２本、あるいは４本以上であってもよい。また、各芯材３は、所定の材質からなる芯材３を少なくとも１つ含む構成、すなわち、それぞれの芯材３の材質が同一であってもよいし、それぞれ異なる材質であってもよい。
【００４１】
以上のように、本実施形態の形状保持体１は、３本の樹脂製の芯材３を被覆材２に挟んだ構成とすることで、１本の樹脂性線材を芯材とした従来の結束材、あるいは単一樹脂のみからなる構成の薄板状の結束材では達成することができなかった、金属線材を芯材とした結束材と同等の高い変形形状保持状態を保つ特性、および結束力を得ることができる。また、本実施形態の形状保持体１は、芯材３が樹脂製であるため、被覆材２も、紙、あるいは樹脂等の焼却可能な非金属材料であれば廃棄時に焼却処理がなされた場合においても残さを生じない。さらに、本実施形態の形状保持体１は、食品の包装用として利用された場合においても、金属探知器に反応しないため、金属探知器を使用しての異物混入検査で金属製の異物として誤って検知されることがない。
【実施例】
本実施例では、被覆材２は厚さ５０μｍのＰＥＴフィルム、芯材３は３０００デニール（直径略０．６７ｍｍ）の線材を用い、幅４．０ｍｍの形状保持体１を作成した。そして、この形状保持体１の機械的性能、塑性変形性能（賦型性能）、および変形形状保持性能（賦型保持性能）に関して調べた。
【００４２】
図７に、本実施例の形状保持体の塑性変形性能（賦型性能）と変形形状保持性能（賦型保持性能）の測定状況を示す説明図を示す。図７（ａ）はループ状に攣曲させた試料の曲部に荷重をかけた状態の試料の斜視図、図７（ｂ）は荷重を取り除いた状態での試料の変形角度（賦型角度）の１例を示す斜視図、図７（ｃ）は、図７（ｂ）の試料の変形角度及び試料を放置した時の試料の戻り角度を示す概念図である。
【００４３】
同様に、比較例としての、単一樹脂のみからなる薄板状結束材に関しても、その機械的性能、塑性変形性能、および変形形状保持性能に関して調べた。
【００４４】
表１に、本実施例の形状保持体の形状保持体、および比較例の薄板状結束材の機械的性能、塑性変形性能、および変形形状保持性能の測定結果を示す。
【００４５】
【表１】

【００４６】
表１の結果に示されるように、本実施例の形状保持体１は賦型度が１７０度、復元率１．２％という特性を有しており、賦型度が１４７度、復元率２．７％である比較例の薄板上結束材よりも、塑性変形が容易で、かつ変形形状保持状態に極めて優れていることがわかった。
【００４７】
【発明の効果】
１本の樹脂性線材を芯材とした結束材、あるいは単一樹脂のみからなる構成の薄板状の結束材では、外力が作用しなくなると元の形状に戻ってしまい、形状を保持する機能が不十分であったが、以上説明したように本発明の形状保持体は、樹脂からなる複数の芯材を有することで高い変形形状保持状態を保つ特性、および結束力と同等の特性を得ることができた。さらに、本発明の形状保持体は、各芯材が樹脂性であるため、紙、あるいは樹脂等の焼却可能な非金属材料であれば、焼却処理において残さを生じず、かつ、食品の包装用として利用された場合においても、金属探知器を使用しての異物混入検査で金属製の異物として誤って検知されることがない。
【図面の簡単な説明】
【図１】本発明における形状保持体の一実施形態の模式的な断面図である。
【図２】図１に示した形状保持体の斜視図である。
【図３】本発明における形状保持体の他の実施形態の模式的な断面図である。
【図４】本発明における形状保持体の他の実施形態の模式的な斜視図である。
【図５】本発明における形状保持体の他の実施形態の模式的な断面図である。
【図６】本発明における形状保持体の他の実施形態の模式的な断面図である。
【図７】本発明における一実施例の形状保持体の塑性変形性能（賦型性能）と変形形状保持性能（賦型保持性能）の測定状況を示す説明図である。
【符号の説明】
１形状保持体
２被覆材
２ａ圧着部
２ｂ内面
２ｃ第１の層
２ｄ第２の層
２ｆ接合層
３芯材
３ａ帯形状芯材
２０ａ第１の被覆材
２０ｂ第２の被覆材
２１側端部
２２側部
２４ａ第１の側端部
２４ｂ第２の側端部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shape holding body for holding the shape of a sheet or bag.
[0002]
In the present specification, the “deformed shape holding state” refers to a state in which the original shape is not returned to the original shape even when the external force stops working.
[0003]
[Prior art]
Conventionally, a metal wire material such as annealed copper or aluminum is used as a core material, and the core material is sandwiched and covered with a covering material such as an elongated vinyl tape or a resin film as a binding material or binding material for a sheet or bag. It is used. These binding materials, or binding materials, can be easily cut, can be easily bent or twisted with fingers, and further, since a metal wire having plastic deformation characteristics is used as a core material, after being bent or twisted, Even if the external force stops working, it retains its original shape without returning to its original shape, and has excellent binding properties when twisted.
[0004]
[Problems to be solved by the invention]
However, if the above-mentioned metal wire is used as the core material, it will react in the contamination inspection by the metal detector that is performed at the final stage when it is used for packaging of mass-produced food. In addition to the problem of disappearance, there is a problem that a residue is generated in the incineration process at the time of disposal.
[0005]
In order to cope with the problem of the binding material using the metal wire as a core material, a binding material using a single resin wire as a core material instead of the metal wire has been proposed. In some cases, the properties to be maintained, that is, the plastic deformation performance (molding performance), the deformed shape retention performance (mold retention performance), and the binding property may not be sufficient.
[0006]
In addition, a thin-plate-like binding material composed of only a single resin in which a moldability imparting agent is blended with a plastic resin has been proposed, but it may not be said that the property of maintaining a deformed shape is sufficient. there were.
[0007]
Therefore, in order to solve the above-mentioned problems, the present invention provides a shape holding body having increased characteristics for maintaining a deformed shape holding state, that is, plastic deformation performance (molding performance) and deformed shape holding performance (molding holding performance). The purpose is to do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the shape holding body of the present invention is such that a core material having plasticity is sandwiched and held between two coating materials made of resin, and the deformed shape is maintained by plastic deformation of the core material. In the shape holder that can maintain the state,
[0009]
The core material has a breaking strength of 200 MPa or more, and the core material made of a thermoplastic resin has a strip shape.
[0010]
In the shape holding body of the present invention, the core material having plasticity is sandwiched and held between two coating materials made of a resin having a melting point equal to or higher than the melting point of the core material. In a shape holding body that can maintain a deformed shape holding state by plastic deformation,
[0011]
The core material has a breaking strength of 200 MPa or more , and a plurality of the core materials made of resin are sandwiched between the coating materials.
[0012]
The shape holding body of the present invention configured as described above has a plurality of core materials made of resin, and maintains a high deformed shape holding state as compared with a binding material having a single core material made of resin. And you can get a binding force.
[0013]
Furthermore, the shape holding body of the present invention has a core material having plasticity and a coating material made of resin that holds the core material and can maintain a deformed shape holding state by plastic deformation of the core material. In the shape holder,
[0014]
The core material has a breaking strength of 200 MPa or more, and the core material is held between one covering material folded at both side ends in the width direction and bound to a bag.
[0015]
In addition, the shape holding body of the present invention is one in which the two side portions in the width direction of one of the covering materials are folded back so as to wrap the both side ends in the width direction of the other covering material. There may be.
[0016]
The shape retention of the present invention, the coating material, to a plurality of layers may be one in which are laminated, the core material, the cross-sectional area of 0.05 mm ² 1.0 mm ² The core material may have a tensile elastic modulus of 5000 MPa or more.
[0017]
Furthermore, in the shape holding body of the present invention, each layer is a layer selected from the group consisting of a layer made of thermoplastic resin, a layer made of paper mixed with a thermoplastic resin, a layer made of paper, and a layer made of metal foil. It may be included.
[0018]
Further, in the shape holding body of the present invention, each layer forming each facing surface of each covering material is a layer made of a thermoplastic resin or a layer made of paper mixed with a thermoplastic resin. Each facing surface may be melt-bonded to each other, and each layer forming each facing surface facing each other of each covering material is a layer made of paper, or a layer made of a metal foil, The facing surfaces may be bonded with an adhesive, a pressure-sensitive adhesive, or an adhesive film.
[0019]
The shape holding body of the present invention may include at least one core material made of a predetermined material.
[0020]
Furthermore, the shape holding body of the present invention may be one in which the surface of the core material is melted and the core material is melt-bonded to the coating material, or the surface of the core material is melted to obtain the core material. It may be melt bonded to an adhesive, a pressure-sensitive adhesive, or an adhesive film.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 shows a schematic cross-sectional view of an embodiment of a shape holder in the present invention, and FIG. 2 shows a perspective view of the shape holder shown in FIG.
[0023]
The shape holding body 1 of the present embodiment has a configuration in which three core members 3 made of a resin having plasticity are sandwiched between two covering materials 2.
[0024]
Each core material 3 is a crystalline thermoplastic synthetic resin composed of one or more of polyolefin resin (including polyethylene resin and polypropylene resin), polyamide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, biodegradable polymer and the like. Glass fiber, talc, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, aluminum hydroxide, silica alumina, titanium oxide, calcium oxide, calcium silicate, basic magnesium carbonate, carbon fiber, carbon black And other inorganic fillers. In addition, each core material 3 will not be limited to the material mentioned above if it is resin which has plasticity.
[0025]
Each coating material 2 has a melting point equal to or higher than the melting point of the core material 3. When polyethylene is used as the material of the core material 3, the covering material 2 is preferably a polymer that is heat-sealed with polyethylene.
[0026]
In addition, as the material of each coating material 2, thermoplastic films such as PVC, PE, and PET, and paper are also suitable, but are not limited thereto.
[0027]
Furthermore, the covering material 2 may be formed of a single layer as shown in FIG. 1, but may be formed of a plurality of layers as shown in FIG. Further, when two coating materials 2 are used as shown in FIGS. 3A and 3B, both the two coating materials 2 may be formed of a plurality of layers. Although not shown, any one of the two covering materials 2 may be formed of a plurality of layers. Thus, when formed with a plurality of layers, each layer is made of a thermoplastic resin, a layer made of paper mixed with a thermoplastic resin, a layer made of paper, a layer made of nonwoven fabric, and a layer made of metal foil. May be included. For example, in FIG. 3 (a), the first layer 2c is a layer made of a thermoplastic resin, or a layer made of paper mixed with a thermoplastic resin, and the second layer 2d is a layer made of a metal foil such as aluminum. You may do.
[0028]
In the case where the first layer 2c, which is a layer forming each inner surface 2a facing each other of each coating material 2, is a layer made of a thermoplastic resin or a layer made of paper mixed with a thermoplastic resin, 2a can be melt-bonded.
[0029]
Further, when the first layer 2c of each covering material 2 is a layer made of paper or a layer made of metal foil, the covering materials 2 are bonded together as shown in FIG. 3 may be provided on the first layer 2c to fix and hold 3. The bonding layer 2f may be any adhesive layer, such as an adhesive, a pressure-sensitive adhesive, an adhesive film, or a pressure-sensitive adhesive film, as long as it can bond the covering materials 2 and fix and hold the core material 3. The bonding layer 2f is formed in order to obtain stronger bonding when the first layer 2c is a layer made of a thermoplastic resin or a layer made of paper mixed with a thermoplastic resin. May be.
[0030]
Next, the shape and performance of the core material 3 will be described.
[0031]
Core member 3 of this embodiment is a thermoplastic resin having a cross-sectional area of approximately 0.05 mm ² 1.0 mm ² stretched linear material whose main polymer. In addition, the shape of the core material 3 of this embodiment is not necessarily limited to a wire having a circular cross section, but may be an ellipse or a square. In short, any shape may be used as long as the wire has plastic deformability. . For example, as shown in FIG. 4, the shape holding body may have a form having a tape-shaped or ribbon-shaped strip-shaped core material 3 a having a square cross section as a core material.
[0032]
Moreover, the core material 3 of the present embodiment has a high strength with a breaking strength of 200 Mpa or more . Moreover, it is desirable that it is an extending | stretching linear thing whose tensile elasticity modulus has a high elasticity modulus of 5000 Mpa or more. This is because it is necessary to bring the breaking strength as high as possible in order to obtain a forming performance that is as close as possible to the metal wire, and according to the experiments of the inventors, in order to obtain a good formability Preferably has a strength of 200 MPa or more. On the other hand, the tensile modulus of elasticity of 5000 MPa or more can prevent breakage of the wire when repeated bending is required.
[0033]
Next, the expanded sectional view of the other example of the shape holding body in this embodiment is shown in FIG. 5 and FIG.
[0034]
In the shape holding body shown in FIG. 5, the core material 3 is sandwiched and held between the two first covering materials 20a and 20b, and the width direction of the second covering material 20b. Both side portions 22 of the first covering member 20a are folded back so as to wrap around both end portions in the width direction of the first covering material 20a.
[0035]
The shape holding body shown in FIG. 6 has a form in which the core material 3 is held by a bag binding of only one covering material 2. That is, one covering material 2 is bound by folding the first side end portion 24a so that the second side end portion 24b in the width direction of the covering material 2 is on the inside. A core material 3 is held between the covering materials 2.
[0036]
In the present embodiment, heat having a high strength tension is provided to provide a characteristic for maintaining a higher degree of deformed shape holding state, that is, plastic deformation performance (molding performance) and stronger deformed shape holding performance (molding holding performance). By linearizing the plastic resin, the absolute volume is reduced to obtain a core material 3 that is easy to plastically deform and is large, and the core material 3 and the flexible covering material 2 are used in combination to form the shape holding body 1. The present inventors have found a completely new shape holding body 1 that gives a necessary constant width shape and at the same time obtains a stronger deformation shape holding performance without impairing the plastic deformation performance.
[0037]
In addition, the thickness and the number of the core materials 3 to be used can be determined by the required degree of plastic deformation force and deformed shape holding force. That is, even if a large plastic deformation force is required, if a large deformation shape holding force is required, the number of cores 3 is increased or the wire diameter is increased, and on the contrary, deformation with a small plastic deformation force (molding) If it is necessary, use a small number or a core material with a thin wire diameter. Or depending on the utilization use of the shape holding body 1, the shape of a core material may be made into a strip | belt shape as shown in FIG.
[0038]
Next, as shown in FIG. 3B, an example of a shape holding body 1 in which two upper and lower covering materials 2 have a three-layer structure of a first layer 2c, a second layer 2d, and a bonding layer 2f. An example of the manufacturing method will be described.
[0039]
The core material 3 is heated to a temperature sufficient to bond the coating materials 2 to each other and the coating material 2 and the core material 3 after passing through a preheating tank set to a temperature at which the surface of the core material 3 is sufficiently melted. It is sent to the thermo-compression-bonding roll, and it is strongly pressure-bonded while being sandwiched between the covering materials 2 between the rolls. As a result, the covering materials 2 and the covering material 2 and the core material 3 are pressure-bonded, and the shape holding body 1 that holds the three core materials 3 in parallel between both the covering materials 2 is formed. In addition, each core material 3 held between the covering materials 2 may be held between the covering materials 2 by pressing each core material 3 itself to the covering material 2 from above and below, As shown in FIG. 3, each core material 3 is not only press-bonded to the covering material 2 from above and below, but also each covering material 2 and each core material 3 may be simultaneously pressed. In this case, in order to make these adhesions stronger, an adhesive that adheres the bonding layer 2f on the first layer 2c made of the thermoplastic resin film well to the core material 3 instead of the film-like adhesive film is used. It may be applied.
[0040]
In addition, in this embodiment, although the shape holding body 1 which has the three core materials 3 is shown in FIG. 1 as an example, the number of the core materials 3 is two or four or more according to a use. There may be. In addition, each core material 3 may include at least one core material 3 made of a predetermined material, that is, the material of each core material 3 may be the same or different.
[0041]
As described above, the shape holding body 1 of the present embodiment has a configuration in which the three resin cores 3 are sandwiched between the covering materials 2 so that one resinous wire is used as a core. Properties that maintain a high deformed shape retention state equivalent to a binding material using a metal wire as a core, and binding force, which could not be achieved with a binding material or a thin-plate binding material composed of only a single resin Can be obtained. In addition, since the core 3 is made of resin in the shape holding body 1 of the present embodiment, if the covering material 2 is also a non-metallic material such as paper or resin that can be incinerated, it is incinerated at the time of disposal. No residue is produced. Furthermore, since the shape holding body 1 of the present embodiment does not react with a metal detector even when used for packaging food, it is erroneously detected as a metal foreign object in the foreign object contamination inspection using the metal detector. Will not be detected.
【Example】
In this example, the shape holding body 1 having a width of 4.0 mm was prepared by using a PET film having a thickness of 50 μm as the covering material 2 and a wire rod of 3000 denier (diameter approximately 0.67 mm) as the core material 3. Then, the mechanical performance, the plastic deformation performance (molding performance), and the deformed shape maintenance performance (molding performance) of the shape holder 1 were examined.
[0042]
In FIG. 7, explanatory drawing which shows the measurement condition of the plastic deformation performance (molding performance) and deformation shape maintenance performance (molding holding performance) of the shape holding body of a present Example is shown. FIG. 7A is a perspective view of the sample in a state where a load is applied to the curved portion of the sample which is bent in a loop shape, and FIG. 7B is a deformation angle (molding angle) of the sample in a state where the load is removed. FIG. 7C is a conceptual diagram showing the deformation angle of the sample in FIG. 7B and the return angle of the sample when the sample is left unattended.
[0043]
Similarly, as a comparative example, the thin plate-like binding material made of only a single resin was also examined with respect to its mechanical performance, plastic deformation performance, and deformation shape retention performance.
[0044]
Table 1 shows the measurement results of the mechanical performance, plastic deformation performance, and deformation shape retention performance of the shape retention body of the shape retention body of this example and the thin plate-like binding material of the comparative example.
[0045]
[Table 1]

[0046]
As shown in the results of Table 1, the shape holder 1 of the present example has characteristics that the degree of shaping is 170 degrees and the restoration rate is 1.2%, the degree of shaping is 147 degrees, and the restoration rate is 2 It was found that the plastic deformation is easier and the deformed shape holding state is extremely better than the binder on the thin plate of the comparative example of 7%.
[0047]
【The invention's effect】
In a binding material having a single resinous wire as a core material or a thin plate-like binding material composed of only a single resin, when an external force stops working, it returns to its original shape and has the function of retaining the shape. Although it was insufficient, as explained above, the shape holding body of the present invention has a characteristic of maintaining a high deformed shape holding state by having a plurality of cores made of resin, and a characteristic equivalent to a binding force. I was able to. Furthermore, since each core material is resinous, the shape holding body of the present invention does not produce a residue in the incineration process as long as it is non-metallic material such as paper or resin, and is used for food packaging. Even when it is used as a metal foreign object, it is not erroneously detected as a metal foreign object in a foreign object contamination inspection using a metal detector.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an embodiment of a shape holder in the present invention.
FIG. 2 is a perspective view of the shape holder shown in FIG.
FIG. 3 is a schematic cross-sectional view of another embodiment of the shape holder in the present invention.
FIG. 4 is a schematic perspective view of another embodiment of the shape holder in the present invention.
FIG. 5 is a schematic cross-sectional view of another embodiment of the shape holder in the present invention.
FIG. 6 is a schematic cross-sectional view of another embodiment of the shape holder in the present invention.
FIG. 7 is an explanatory diagram showing measurement states of plastic deformation performance (molding performance) and deformation shape holding performance (molding holding performance) of a shape holder according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shape support body 2 Covering material 2a Crimp part 2b Inner surface 2c 1st layer 2d 2nd layer 2f Joining layer 3 Core material 3a Band-shaped core material 20a 1st coating material 20b 2nd coating material 21 Side edge part 22 Side 24a first side end 24b second side end

Claims

In a shape holding body in which a core material having plasticity is sandwiched and held between two coating materials made of resin, and a deformed shape holding state can be maintained by plastic deformation of the core material,
A shape holding body, wherein the core material has a breaking strength of 200 MPa or more, and the core material made of a thermoplastic resin has a band shape.

A core material having plasticity is sandwiched and held between two coating materials made of a resin having a melting point equal to or higher than the melting point of the core material, and the deformed shape is maintained by plastic deformation of the core material. In a shape holder that can
A shape holding body, wherein the core material has a breaking strength of 200 MPa or more , and a plurality of the core materials made of resin are sandwiched between the covering materials.

In a shape holding body that has a plastic core material, holds the core material, has a coating material made of resin, and can maintain a deformed shape holding state by plastic deformation of the core material,
The core material has a breaking strength of 200 MPa or more, and the core material is held between the one covering material that is folded at both ends in the width direction and is bound to a bag. body.

The shape according to claim 1 or 2, wherein, of the two coating materials, both side portions in the width direction of one of the coating materials are folded back so as to wrap around both side ends in the width direction of the other coating material. Holding body.

The shape holding body according to any one of claims 1 to 4, wherein the covering material is formed by laminating a plurality of layers.

The core material, shape maintaining member according to any one of claims 1 to 5 having a sectional area of 0.05 mm ² 1.0 mm ^2.

The shape holding body according to any one of claims 1 to 6 , wherein the core member has a tensile elastic modulus of 5000 MPa or more.

Wherein each layer, a layer made of a thermoplastic resin, a layer made of paper thermoplastic resin is mixed, a layer made of paper, any one of claims 5 to 7 comprising a layer selected from the group consisting of a layer made of a metal foil The shape holding body according to item 1.

When the respective layers forming the facing surfaces facing each other of the covering materials are layers made of the thermoplastic resin or layers made of paper mixed with the thermoplastic resin, the facing surfaces are melted. The shape holding body according to claim 8 , which is bonded.

In the case where the respective layers forming the facing surfaces facing each other of the respective covering materials are layers made of the paper or the layers made of the metal foil, the facing surfaces are made of an adhesive, a pressure-sensitive adhesive, or an adhesive property. The shape holding body according to claim 8 , which is bonded with a film.

Shape maintaining member according to any one of claims 1 to 10 comprising at least one said core material formed of a predetermined material.

The shape holding body according to any one of claims 1 to 11 , wherein a surface of the core material is melted and the core material is melt-bonded to the covering material.

The shape holding body according to any one of claims 10 to 12 , wherein a surface of the core material is melted and the core material is melt bonded to the adhesive, the pressure-sensitive adhesive, or the adhesive film.