JP2017144626A - Multilayer sheet for deep drawing molding - Google Patents

Multilayer sheet for deep drawing molding Download PDF

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JP2017144626A
JP2017144626A JP2016027770A JP2016027770A JP2017144626A JP 2017144626 A JP2017144626 A JP 2017144626A JP 2016027770 A JP2016027770 A JP 2016027770A JP 2016027770 A JP2016027770 A JP 2016027770A JP 2017144626 A JP2017144626 A JP 2017144626A
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layer
sheet
multilayer sheet
deep drawing
heat seal
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大輔 足立
Daisuke Adachi
大輔 足立
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Mitsubishi Chemical Corp
Mitsubishi Chemical Group Corp
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Mitsubishi Chemical Corp
Mitsubishi Chemical Holdings Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a packaging material for package which can be opened by easy breaking or dividing of an opening by hands when the package does not have a complicated structure or shape, and to provide a package in which a production of the package and filling of a content can be performed in a consistent process.MEANS FOR SOLVING THE PROBLEM: In a multilayer sheet formed of at least two or more layers in which a surface layer containing an unfoamed polystyrene resin (PS) and a heat seal layer formed of a polyolefin resin are arranged, the multilayer sheet for deep drawing molding satisfies conditions of a content of a general-purpose polystyrene resin of the surface layer, a thickness ratio of the surface layer, a thickness of the heat seal layer, and that the multilayer sheet can be divided in a horizontal straight line without half cutting.SELECTED DRAWING: Figure 2

Description

本発明は、主に深絞り成型用多層シートに関するものである。   The present invention mainly relates to a multilayer sheet for deep drawing.

昨今、地球環境問題、少子高齢化問題等に起因する包装体のユニバーサルデザイン化の要望が多く、特に易開封性の点では、より簡便に開封することが可能な包装体の設計が必要とされている。   Recently, there are many requests for universal design of packaging due to global environmental problems, low birthrate and aging problems, etc. Especially in terms of easy opening, it is necessary to design packaging that can be opened more easily. ing.

液体や粘調体、または粉体等用の包装体は、例えばアンプル体のような、包装体の一部に簡易的な切断部や弱化部を設け、当該箇所を切断、破断、割断等して開封される構造が用いられ、簡便に開封できる包装体の構造や形状について多くの検討が為されてきた。特に、医療分野で多用されるガラス製アンプルの場合は、鑢で傷をつけてから開封したり、プラスチック製の場合は、鋏等の刃物で先端を切断し開口したりするなど、道具を用いて開封することが常であり、手で容易に開口することが困難な状況である。また、容易な開口が可能な構造であっても、それらの包装体構造や形状に関する技術は、複雑化の一途を辿っている。(例えば、特許文献1〜4)   A package for liquids, viscous bodies, powders, etc. is provided with a simple cut or weakened part in a part of the package, such as an ampoule, and the part is cut, broken, cleaved, etc. Many studies have been made on the structure and shape of a package that can be opened easily. In particular, in the case of a glass ampoule that is frequently used in the medical field, use a tool such as opening it after scratching it with a scissors, or in the case of plastic, cutting and opening the tip with a scissors or other blade. It is a situation that is difficult to open easily by hand. Moreover, even if it is a structure in which easy opening is possible, the technique regarding those package body structures and shapes is increasingly complicated. (For example, Patent Documents 1 to 4)

一方、包装体に用いられる素材(包材)に関する技術は、深耕されてきておらず、これら状況から、現在の市場環境では、より簡便に開封可能な包装体を設計するための、優れた包装体素材が強く求められている。   On the other hand, the technology related to the material (packaging material) used for the package has not been deeply cultivated. From these circumstances, excellent packaging for designing a package that can be opened more easily in the current market environment. Body materials are strongly demanded.

さらに、従来の上述のプラスチック製包装体の多くは、ブロー成形や射出成型により製造されており、これらは包装体成形と内容物充填の工程が別個であり、そのため製造コストと輸送コストが加算されている。   Furthermore, many of the above-mentioned conventional plastic packaging bodies are manufactured by blow molding or injection molding, and these are separate processes for molding the packaging body and filling the contents, so that the manufacturing cost and the transportation cost are added. ing.

特開平11−130112号公報JP-A-11-130112 特開2004−83115号公報JP 2004-83115 A 特開2006−16027号公報JP 2006-16027 A 特開2009−154949号公報JP 2009-154949 A

そこで、本発明は、包装体が複雑な構造や形状でなくても、手で容易に開口部を破断または割断して開封することが可能な包装体用の包装材を提供すること、更に、包装体の製造と内容物の充填を一貫した工程で行うことができる包装材を提供することを課題とする。   Accordingly, the present invention provides a packaging material for a packaging body that can be easily opened by breaking or cleaving the opening even if the packaging body does not have a complicated structure or shape, It is an object of the present invention to provide a packaging material capable of performing manufacturing of a package and filling of contents in a consistent process.

本発明は、深絞り成型用に特定構成の包装材を使用することで上記課題解決を解決できることを見出したものであり、
非発泡のポリスチレン系樹脂(PS)を含む表層とポリオレフィン系樹脂からなるヒートシール層とを有する、少なくとも2層以上の多層シートにおいて、次の(a)〜(d)の条件を満たすことを特徴とする深絞り成型用多層シートに存する。
(a)表層の汎用ポリスチレン樹脂(GPPS)の含有比率が30質量%を超え80質量%未満
(b)総厚に対する表層の層厚比率が50%以上95%以下
(c)ヒートシール層の層厚が5μm以上100μm以下
(d)長辺10cm短辺2cmのシート短冊片をハーフカットなしで、ヒートシール層を内向きに、短辺端を合わせるように屈曲させる試験において、短辺方向に直線状に割断できる
The present invention has found that the above-mentioned problem solution can be solved by using a packaging material having a specific configuration for deep drawing.
A multilayer sheet having at least two layers having a surface layer containing a non-foamed polystyrene resin (PS) and a heat seal layer made of a polyolefin resin, satisfying the following conditions (a) to (d): It exists in the multilayer sheet for deep drawing.
(A) The content ratio of the general-purpose polystyrene resin (GPPS) in the surface layer exceeds 30% by mass and less than 80% by mass (b) The layer thickness ratio of the surface layer to the total thickness is 50% or more and 95% or less (c) The layer of the heat seal layer (D) In a test in which a sheet strip with a long side of 10 cm and a short side of 2 cm is bent without a half-cut, the heat seal layer faces inward and the short side ends are aligned to make a straight line in the short side direction. Can be cleaved

本発明の深絞り成型用多層シートによれば、手で容易に開口部を破断または割断することで開封可能な包装体を製造でき、内容物の性状に応じ、自由度の高い簡易な構造、形状の包装体を設計できる。また、包装体の製造と内容物の充填を一貫した工程で行うことができるので、製造コストおよび輸送コストを削減できる。   According to the multilayer sheet for deep drawing of the present invention, it is possible to produce a package that can be opened by easily breaking or cleaving the opening by hand, and according to the properties of the contents, a simple structure with a high degree of freedom, Shaped package can be designed. Moreover, since the manufacture of the package and the filling of the contents can be performed in a consistent process, the manufacturing cost and the transportation cost can be reduced.

本発明の深絞り成型用多層シートを用いた深絞り成形体の概略断面図である。It is a schematic sectional drawing of the deep drawing molded object using the multilayer sheet for deep drawing of this invention. 本発明の深絞り成型用多層シートの層構成の例を示す概略断面図である。It is a schematic sectional drawing which shows the example of a layer structure of the multilayer sheet | seat for deep drawing of this invention. 本発明の深絞り成型用多層シートの割断性評価方法を示す略図である。It is the schematic which shows the cleaving property evaluation method of the multilayer sheet for deep drawing of this invention.

本発明の深絞り成型用多層シート(以下、本発明のシートと呼ぶことがある)について、詳述する。
本発明のシートは、非発泡のポリスチレン系樹脂(PS)を含む表層とポリオレフィン系樹脂からなるヒートシール層とを有する、少なくとも2層以上の多層シートである。
非発泡のポリスチレン系樹脂(PS)を含む表層は、深絞り包装体において収容部とは逆側に位置し、ポリオレフィン系樹脂からなるヒートシール層は、深絞り包装体において収容部側に位置する。そして、深絞り成形された本発明のシートのヒートシール層面と、蓋材などの被着体のヒートシール面とを合わせてヒートシールすることで、深絞り包装体を作製できる。
The multilayer sheet for deep drawing of the present invention (hereinafter sometimes referred to as the sheet of the present invention) will be described in detail.
The sheet | seat of this invention is a multilayer sheet | seat of at least 2 layer or more which has the surface layer containing non-foamed polystyrene resin (PS) and the heat seal layer which consists of polyolefin resin.
The surface layer containing non-foamed polystyrene resin (PS) is located on the side opposite to the housing part in the deep-drawn package, and the heat seal layer made of polyolefin resin is located on the housing part side in the deep-drawn package. . And the deep-drawing package can be produced by combining the heat-sealing layer surface of the sheet of the present invention that has been deep-drawn and the heat-sealing surface of the adherend such as a lid, and then heat-sealing.

<表層>
本発明のシートの表層は、ポリスチレン系樹脂(PS)を含み、該PSは発泡させないものである。また、該PSは、30質量%を超え80質量%未満の含有比率で汎用ポリスチレン樹脂(GPPS)を含む。下限は50質量%以上がより好ましく、60質量%以上が更に好ましい。上限は75質量%以下がより好ましく、70質量%以下が更に好ましい。
GPPS含有比率が30質量%より高いことにより、深絞り包装体が割れやすく開封し易くなる。80質量%未満により、割れやす過ぎて予定と異なる箇所で開口してしまうことを防止できる。従って、GPPS含有比率が上記所定範囲であることで、シートに適度な割れ易さとコシとを兼備でき、易開封性に有効である。
<Surface>
The surface layer of the sheet of the present invention contains a polystyrene resin (PS), and the PS is not foamed. Moreover, this PS contains general purpose polystyrene resin (GPPS) with the content rate of more than 30 mass% and less than 80 mass%. The lower limit is more preferably 50% by mass or more, and still more preferably 60% by mass or more. The upper limit is more preferably 75% by mass or less, and still more preferably 70% by mass or less.
When the GPPS content ratio is higher than 30% by mass, the deep-drawn package is easily broken and easily opened. If it is less than 80% by mass, it can be prevented from opening at a place different from the plan because it is too fragile. Therefore, when the GPPS content ratio is within the predetermined range, the sheet can have both moderate cracking and stiffness, and is effective for easy opening.

本発明のシートの表層は、耐衝撃性ポリスチレン(HIPS)、および/またはスチレン系エラストマーを含有することが好ましい。スチレン系エラストマーとしては、ポリスチレン相をハードセグメントとして有する公知のスチレン系エラストマーが使用できる。具体的には、スチレン−ブタジエン共重合体(SBR)、スチレン−イソプレン−スチレン共重合体(SIS)、スチレン−ブタジエン−スチレン共重合体(SBS)、およびこれらの水素化物(SEBS、SEPS等)、スチレン−イソブチレン−スチレントリブロック共重合体(SIBS)、スチレン−イソブチレンジブロック共重合体(SIB)を挙げることができる。
中でも、シートへの弾性、強度の付与の観点から、HIPS、および/またはSBRを含有することがより好ましくい。特に、GPPSとSBRとの混合が、シートの割断性、コシ感、深絞り加工性とのバランスが良好となる。
表層におけるHIPS、および/またはスチレン系エラストマーの含有比率は、70質量%未満が好ましく、50質量%以下がより好ましく、40質量%以下が更に好ましい。
The surface layer of the sheet of the present invention preferably contains impact-resistant polystyrene (HIPS) and / or a styrene-based elastomer. As the styrene elastomer, a known styrene elastomer having a polystyrene phase as a hard segment can be used. Specifically, styrene-butadiene copolymer (SBR), styrene-isoprene-styrene copolymer (SIS), styrene-butadiene-styrene copolymer (SBS), and hydrides thereof (SEBS, SEPS, etc.) And styrene-isobutylene-styrene triblock copolymer (SIBS) and styrene-isobutylene diblock copolymer (SIB).
Especially, it is more preferable to contain HIPS and / or SBR from the viewpoint of imparting elasticity and strength to the sheet. In particular, the mixture of GPPS and SBR provides a good balance between sheet cleaving, stiffness, and deep drawing workability.
The content ratio of HIPS and / or styrene elastomer in the surface layer is preferably less than 70% by mass, more preferably 50% by mass or less, and further preferably 40% by mass or less.

表層の厚みは、シート総厚に対して50%以上95%以下が好ましい。下限は60%がより好ましく、75%以上が更に好ましい。
表層厚比率50%以上により、表層の組成によるシートの割れ易さが有効に発現される。95%以下によりヒートシール層とのバランスが良く、被着体とのヒートシールが十分な強度で為される。
The thickness of the surface layer is preferably 50% or more and 95% or less with respect to the total thickness of the sheet. The lower limit is more preferably 60% and even more preferably 75% or more.
When the surface layer thickness ratio is 50% or more, the ease of cracking of the sheet due to the composition of the surface layer is effectively expressed. When it is 95% or less, the balance with the heat seal layer is good, and the heat seal with the adherend is performed with sufficient strength.

<ヒートシール層>
本発明のシートのヒートシール層は、ポリオレフィン系樹脂からなる。ポリオレフィン系樹脂としては、ポリエチレン系樹脂、ポリプロピレン系樹脂、環状ポリオレフィン系樹脂が挙げられ、シートの破断性の観点から、引張伸び300%以下のポリオレフィン樹脂の使用が好ましい。
<Heat seal layer>
The heat seal layer of the sheet of the present invention is made of a polyolefin resin. Examples of the polyolefin resin include a polyethylene resin, a polypropylene resin, and a cyclic polyolefin resin. From the viewpoint of sheet breakability, it is preferable to use a polyolefin resin having a tensile elongation of 300% or less.

ポリエチレン系樹脂としては、低密度ポリエチレン、直鎖状低密度ポリエチレン、高密度ポリエチレン、エチレン−酢酸ビニル共重合体、エチレン−エチルアクリレート共重合体、エチレン−アクリル酸共重合体、エチレン−メチルアクリレート共重合体、エチレン−メチルメタクリレート共重合体、エチレン系アイオノマー、およびこれらの混合物が挙げられる。ポリプロピレン系樹脂としては、ホモポリプロピレン、プロピレンとα−オレフィンとのランダム共重合体や、ブロック共重合体が挙げられる。環状ポリオレフィン系樹脂としては、ノルボルネン骨格を有する樹脂などが挙げられる。 Polyethylene resins include low density polyethylene, linear low density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer. Examples include polymers, ethylene-methyl methacrylate copolymers, ethylene ionomers, and mixtures thereof. Examples of the polypropylene resin include homopolypropylene, random copolymers of propylene and α-olefin, and block copolymers. Examples of the cyclic polyolefin resin include a resin having a norbornene skeleton.

これらの樹脂は単独での使用、混合しての使用とも可能である。混合組成においては、例えば、シート製膜性の良好な低密度ポリエチレンとシート裂け性の良好な高密度ポリエチレンとを混合して両物性を調整したり、互いに非相溶なポリエチレンとポリプロピレンを混合してヒートシール層に易剥離性を付与したりすることができる。   These resins can be used alone or in combination. In the mixed composition, for example, low density polyethylene having good sheet-forming properties and high density polyethylene having good sheet tearing properties are mixed to adjust both physical properties, or polyethylene and polypropylene that are incompatible with each other are mixed. Thus, easy peelability can be imparted to the heat seal layer.

ヒートシール層の層厚は、5μm以上100μm未満が好ましい。下限は10μm以上がより好ましく、20μm以上が更に好ましい。上限は50μm以下がより好ましく、30μm以下が更に好ましい。
ヒートシール層厚が5μm以上により、シート製膜性とシートのコシ感が良好となり、かつ被着体との十分なヒートシールが可能となる。100μm未満により、表層に依るシートの割れ易さを阻害することがなく、シート全層が綺麗に割断できるようになる。
The layer thickness of the heat seal layer is preferably 5 μm or more and less than 100 μm. The lower limit is more preferably 10 μm or more, and further preferably 20 μm or more. The upper limit is more preferably 50 μm or less, and further preferably 30 μm or less.
When the thickness of the heat seal layer is 5 μm or more, the sheet-forming property and the stiffness of the sheet are improved, and sufficient heat sealing with the adherend is possible. When the thickness is less than 100 μm, the ease of cracking of the sheet depending on the surface layer is not hindered, and the entire sheet can be cleaved cleanly.

<他の層>
本発明のシートは、非発泡のポリスチレン系樹脂を含む表層と、ポリオレフィン系樹脂からなるヒートシール層との少なくとも2層以上を有する多層シートであれば、例えば図2(a)、(b)のように、他の層を有することが可能である。
例えば、エチレン−酢酸ビニル共重合体けん化物からなる層、および/またはメタキシレンジアミン系ポリアミド樹脂からなる層を中間層として、表層とヒートシール層の間に配し、シートにガスバリア性を付与することができる。
また、本発明のシートは、当該表層の外側表面上に環状ポリオレフィン系樹脂、および/または非晶ポリエステル系樹脂からなる層を配し、シートに強度や光沢性を付与することが出来る。環状ポリオレフィン系樹脂としては、例えばノルボルネン骨格を有するポリオレフィン樹脂などが挙げられ、非晶ポリエステル系樹脂としては、例えばグリコール変性ポリエチレンテレフタレート樹脂などが挙げられる。
また、各層間の接着強度を高めるために接着性樹脂または接着剤からなる層を配することができる。
<Other layers>
If the sheet | seat of this invention is a multilayer sheet | seat which has at least 2 layer or more of the surface layer containing non-foamed polystyrene resin and the heat seal layer which consists of polyolefin resin, for example, Fig.2 (a), (b) As such, it is possible to have other layers.
For example, a layer composed of a saponified ethylene-vinyl acetate copolymer and / or a layer composed of a metaxylenediamine-based polyamide resin is used as an intermediate layer, and is disposed between the surface layer and the heat seal layer to impart gas barrier properties to the sheet. be able to.
Moreover, the sheet | seat of this invention can arrange | position the layer which consists of cyclic polyolefin resin and / or an amorphous polyester-type resin on the outer surface of the said surface layer, and can give intensity | strength and glossiness to a sheet | seat. Examples of the cyclic polyolefin-based resin include a polyolefin resin having a norbornene skeleton, and examples of the amorphous polyester-based resin include a glycol-modified polyethylene terephthalate resin.
Moreover, in order to raise the adhesive strength between each layer, the layer which consists of adhesive resin or an adhesive agent can be arranged.

<シート層構成>
本発明のシートの層構成例を図2に示す。図2(a)は、表層/接着層/ヒートシール層、図2(b)は、{PETG層および/または環状PO層}/接着層/{EVOH層および/またはMXD層}/接着層/ヒートシール層 の例である。
また、以下に層構成順の例を、外層側から収容物側の内層への順に示す。
層組成として、ポリスチレン系樹脂を含む表層をPS、ポリエチレン系樹脂層をPE、ポリプロピレン系樹脂層をPP、エチレン−酢酸ビニル共重合体けん化物層をEVOH、メタキシレンジアミン系ポリアミド樹脂層をMXD、環状ポリオレフィン系樹脂層を環PO、非晶ポリエステル系樹脂層をPETG、接着層をADと表記する。
・PS/AD/PE
・PS/AD/PP
・PS/AD/EVOH/AD/PE
・PS/AD/EVOH/AD/PP
・PS/AD/MXD/AD/PE
・PS/AD/MXD/AD/PP
・PS/AD/EVOH/AD/環PO
・環PO/AD/PS/AD/EVOH/AD/PE
・環PO/AD/PS/AD/EVOH/AD/PP
・PETG/AD/PS/AD/EVOH/AD/PE
・PETG/AD/PS/AD/EVOH/AD/PP
<Sheet layer configuration>
An example of the layer structure of the sheet of the present invention is shown in FIG. 2 (a) shows a surface layer / adhesive layer / heat seal layer, FIG. 2 (b) shows {PETG layer and / or cyclic PO layer} / adhesive layer / {EVOH layer and / or MXD layer} / adhesive layer / It is an example of a heat seal layer.
In addition, an example of the layer configuration order is shown below in the order from the outer layer side to the inner layer on the container side.
As the layer composition, PS is a surface layer containing a polystyrene resin, PE is a polyethylene resin layer, PP is a polypropylene resin layer, EVOH is a saponified ethylene-vinyl acetate copolymer layer, MXD is a metaxylenediamine polyamide resin layer, The cyclic polyolefin resin layer is expressed as ring PO, the amorphous polyester resin layer as PETG, and the adhesive layer as AD.
・ PS / AD / PE
・ PS / AD / PP
・ PS / AD / EVOH / AD / PE
・ PS / AD / EVOH / AD / PP
・ PS / AD / MXD / AD / PE
・ PS / AD / MXD / AD / PP
・ PS / AD / EVOH / AD / ring PO
・ Ring PO / AD / PS / AD / EVOH / AD / PE
・ Ring PO / AD / PS / AD / EVOH / AD / PP
・ PETG / AD / PS / AD / EVOH / AD / PE
・ PETG / AD / PS / AD / EVOH / AD / PP

<シート全体>
本発明のシートの総厚は、300μm以上1000μm以下が好ましい。下限は400μm以上がより好ましく、500μm以上が更に好ましい。上限は800μm以下がより好ましく、600μm以下が更に好ましい。300μm以上により、シートのコシ感や強度が得られ、1000μm以下により深絞り成型の加工性が良好となると共に、シートの割断が容易となる。
<Whole sheet>
The total thickness of the sheet of the present invention is preferably 300 μm or more and 1000 μm or less. The lower limit is more preferably 400 μm or more, and even more preferably 500 μm or more. The upper limit is more preferably 800 μm or less, and even more preferably 600 μm or less. When the thickness is 300 μm or more, the stiffness and strength of the sheet can be obtained, and when the thickness is 1000 μm or less, the workability of deep drawing is improved and the sheet is easily cut.

本発明のシートは、引張伸び10%以上100%以下、かつ引張弾性率1500MPa以上3000MPa以下である。引張伸びは、20%以上80%以下がより好ましく、引張弾性率は、1800MPa以上2500MPa以下がより好ましい。
引張伸びは、10%以上により、シートを折り曲げる際に適度に伸びて割断しやすく、100%以下により、シートを折り曲げる際に伸び過ぎて破断し難くなることを抑制できる。また、引張弾性率は、1500MPa以上により、シートに適度なコシ感が付与され、3000MPa以下により、シートが割れ易くなる。
引張伸びおよび引張弾性率は、JIS K 7127法に準じて測定することができる。
The sheet of the present invention has a tensile elongation of 10% to 100% and a tensile modulus of 1500 MPa to 3000 MPa. The tensile elongation is more preferably from 20% to 80%, and the tensile modulus is more preferably from 1800 MPa to 2500 MPa.
When the sheet is bent, the tensile elongation is moderately stretched and easily cut when the sheet is bent, and when it is 100% or less, it is possible to prevent the sheet from being excessively stretched and difficult to break. Further, when the tensile elastic modulus is 1500 MPa or more, a moderate stiffness is imparted to the sheet, and when it is 3000 MPa or less, the sheet is easily broken.
The tensile elongation and tensile modulus can be measured according to JIS K 7127 method.

本発明のシートは、長辺10cm短辺2cmの短冊片において、ハーフカットを行わずに、ヒートシール層を内向きに、短辺の端同士を合わせるように屈曲させる試験において、短辺方向に直線状に割断できる。
従来の技術では、シートを折り曲げて割る仕組みのために、開口、開封する予定の箇所において、シートの厚みを局所的に薄くする、または、ハーフカットと呼称されるシートの厚み方向に線状、点線状、破線状の切れ込みを入れる処理が必要であったが、本発明のシートは、それらのような割れ易くする加工を行わずとも、シートを割断できるものである。
その評価は、図3(a)のように長辺10cm短辺2cmの短冊片に切り出したシートを、図3(b)のようにヒートシール層を内向きに短辺の端同士を合わせるように、長辺の5cm箇所で屈曲させ、シートの割断の状態を観察して行う。
The sheet of the present invention is a strip with a long side of 10 cm and a short side of 2 cm. In a test in which the heat seal layer is bent inward and the ends of the short sides are aligned with each other without half-cutting, in the short side direction. It can be cut straight.
In the prior art, because of the mechanism for folding and breaking the sheet, the thickness of the sheet is locally reduced at the opening and opening planned locations, or linear in the thickness direction of the sheet called half cut, Although the process of making a dotted line-like or broken line-like cut was necessary, the sheet of the present invention can cleave the sheet without performing the process of making it easy to break.
The evaluation is made such that a sheet cut into strips having a long side of 10 cm and a short side of 2 cm as shown in FIG. 3A is aligned with the ends of the short sides facing the heat seal layer inward as shown in FIG. In addition, the sheet is bent at a location of 5 cm on the long side, and the sheet is cut and observed.

本発明のシートは、上記物性や機能を阻害しない限り、各層へ添加剤を混合することができる。添加剤として、例えば、アンチブロッキング剤、スリップ剤、加工助剤、酸化防止剤、紫外線吸収剤、等が挙げられる。
本発明のシートは、共押出法、押出ラミネート法、ドライラミネート法、などの公知の方法で製造でき、共押出法が製造工程を集約できる点から好ましい。
In the sheet of the present invention, additives can be mixed in each layer as long as the physical properties and functions are not impaired. Examples of the additive include an anti-blocking agent, a slip agent, a processing aid, an antioxidant, and an ultraviolet absorber.
The sheet of the present invention can be produced by a known method such as a co-extrusion method, an extrusion laminating method, or a dry laminating method, and the co-extrusion method is preferable because the production steps can be integrated.

以下に、実施例を用いて本発明を説明するが、本発明はこれに限定されるものではない。
<実施例1〜4 比較例1〜5>
各層樹脂を単軸押出機により溶融混練押出をし、Tダイ法にて樹脂温度210℃で共押出した後、80℃のキャスティングロールで急冷製膜し、無延伸共押出多層シートを得た。
Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.
<Examples 1-4 Comparative Examples 1-5>
Each layer resin was melt kneaded and extruded by a single screw extruder, coextruded by a T-die method at a resin temperature of 210 ° C., and then rapidly cooled by a 80 ° C. casting roll to obtain an unstretched coextruded multilayer sheet.

各層を構成する組成と略号は、次の通りである。
・PS1; GPPS(60質量%)とSBR(40質量%)の混合
・PS2; GPPS(30質量%)とSBR(70質量%)の混合
・PS3; GPPS(80質量%)とSBR(20質量%)の混合
・PS4; GPPS(60質量%)とHIPS(40質量%)の混合
・PS5; HIPS(100質量%)
・AD; 無水マレイン酸変性ポリエチレン 密度910kg/m
・EVOH; エチレン酢酸ビニル共重合体けん化物 エチレン含有率32モル%
・PE; 高密度ポリエチレン 密度960kg/m
Compositions and abbreviations constituting each layer are as follows.
-PS1; GPPS (60 mass%) and SBR (40 mass%) mixed-PS2; GPPS (30 mass%) and SBR (70 mass%) mixed-PS3; GPPS (80 mass%) and SBR (20 mass%) PS4; GPPS (60% by mass) and HIPS (40% by mass) PS5; HIPS (100% by mass)
AD: maleic anhydride-modified polyethylene density 910 kg / m 3
EVOH; saponified ethylene vinyl acetate copolymer ethylene content 32 mol%
・ PE; High density polyethylene density 960kg / m 3

各例のシート層構成を、外層側から順に記す。
<実施例1>
PS4(600μm)/AD(20μm)/EVOH(15μm)/AD(15μm)/PE(30μm)
<実施例2>
PS1(600μm)/AD(20μm)/PE(30μm)
The sheet layer configuration of each example will be described in order from the outer layer side.
<Example 1>
PS4 (600 μm) / AD (20 μm) / EVOH (15 μm) / AD (15 μm) / PE (30 μm)
<Example 2>
PS1 (600 μm) / AD (20 μm) / PE (30 μm)

<実施例3>
PS1(200μm)/AD(10μm)/PE(10μm)
<実施例4>
PS1(1200μm)/AD(50μm)/PE(50μm)
<Example 3>
PS1 (200 μm) / AD (10 μm) / PE (10 μm)
<Example 4>
PS1 (1200 μm) / AD (50 μm) / PE (50 μm)

<比較例1>
PS2(600μm)/AD(20μm)/PE(30μm)
<比較例2>
PS3(600μm)/AD(20μm)/PE(30μm)
<Comparative Example 1>
PS2 (600 μm) / AD (20 μm) / PE (30 μm)
<Comparative example 2>
PS3 (600 μm) / AD (20 μm) / PE (30 μm)

<比較例3>
PS1(200μm)/AD(20μm)/PE(400μm)
<比較例4>
PS1(600μm)/AD(20μm)/PE(100μm)
<Comparative Example 3>
PS1 (200 μm) / AD (20 μm) / PE (400 μm)
<Comparative Example 4>
PS1 (600 μm) / AD (20 μm) / PE (100 μm)

<比較例5>
PS5(500μm)
<Comparative Example 5>
PS5 (500μm)

各例で得た多層シートについて、以下の評価を行い、結果を表1に示す。
<評価項目1、引張伸び>
JIS K 7127に準拠して測定して評価した。
A; 10%以上100%以下
B; 10%未満
C; 100%より大
The multilayer sheet obtained in each example was evaluated as follows, and the results are shown in Table 1.
<Evaluation item 1, tensile elongation>
The measurement was performed according to JIS K 7127 and the evaluation was made.
A; 10% or more and 100% or less B; Less than 10% C; Greater than 100%

<評価項目2、引張弾性率>
JIS K 7127に準拠して測定して評価した。
A; 1500MPa以上3000MPa以下
B; 1500MPa未満
C; 3000MPaより大
<Evaluation item 2, tensile modulus>
The measurement was performed according to JIS K 7127 and the evaluation was made.
A: 1500 MPa or more and 3000 MPa or less B; less than 1500 MPa C; greater than 3000 MPa

<評価項目3、割断性試験>
長辺10cm、短辺2cmのシート短冊片を用い、ハーフカットを施さずに、ヒートシール層を内向きに縦半分に屈曲し、その状態を観察し評価した。
A; シート全層が短辺方向に一直線状に割断する
A−; 若干の亀裂が発生するが、シート全層が短辺方向に一直線に割断する
B; 複数の亀裂が入って割断する
C; 表層は割れるが、ヒートシール層が割断されない
D; 表層、ヒートシール層とも割断されない
<Evaluation item 3, cleaving test>
A sheet strip having a long side of 10 cm and a short side of 2 cm was used, and the heat-seal layer was bent inward in the vertical half without being half-cut, and the state was observed and evaluated.
A: All the sheet layers are cleaved in a straight line in the short side direction A-; Some cracks are generated, but all the sheet layers are cleaved in a straight line in the short side direction B; Although the surface layer is cracked, the heat seal layer is not cleaved. D: Both the surface layer and the heat seal layer are not cleaved

<評価項目4、深絞り包装機適性>
深絞り包装機を用い、得られたシートを成型温度130℃、成型加熱時間3秒の条件で、縦50mm、横50mm、深さ40mmの略直方体状に深絞り成型し、被着体として下記の蓋材を用い、ヒートシール温度140℃、シール時間3秒の条件で、深絞り材と蓋材のヒートシールを行い、得られたシートの深絞り成型性とヒートシール性の良否を評価した。
蓋材; 二軸延伸ナイロン6フィルム(15μm厚)と直鎖状低密度ポリエチレンフィルム(50μm厚)を2液硬化型ウレタン系接着剤でドライラミネートしたもの
A; 深絞り成型良好、かつヒートシール良好
B; 深絞り成型はできるが、深絞り成型品のコシが不足
C; 深絞り成型良好だが、ヒートシール不良
D; 深絞り成型不良
−; 評価せず
<Evaluation item 4, suitability for deep-drawing packaging machines>
Using a deep-drawing packaging machine, the obtained sheet is deep-drawn into a substantially rectangular parallelepiped shape having a length of 50 mm, a width of 50 mm, and a depth of 40 mm under the conditions of a molding temperature of 130 ° C. and a molding heating time of 3 seconds. The cover was heat-sealed between the deep-drawn material and the cover material under the conditions of a heat seal temperature of 140 ° C. and a sealing time of 3 seconds, and the quality of the deep-drawn formability and heat-sealability of the obtained sheet was evaluated. .
Lid: A biaxially stretched nylon 6 film (15 μm thick) and a linear low-density polyethylene film (50 μm thick) dry-laminated with a two-component curable urethane adhesive. A; Good deep drawing and good heat seal B: Deep-drawing can be done, but the depth of the deep-drawing product is insufficient. C: Deep-drawing is good but heat seal is poor.
D; Deep drawing molding failure-; Not evaluated

Figure 2017144626
Figure 2017144626

実施例1、2は、引張伸び、引張弾性率、割れ性試験、深絞り包装機適性の何れも良好であった。
実施例3は、成型前のシート片の割断性は良好であったが、シート厚が薄いため、成型品のコシが弱く、深絞り成型品としての割断性はやや低下した。
実施例4は、割断性は良好であったが、シート厚が厚いため、深絞り成型性がやや劣っていた。
In Examples 1 and 2, all of tensile elongation, tensile elastic modulus, crackability test, and suitability for deep drawing packaging machines were good.
In Example 3, the cleaving property of the sheet piece before molding was good, but because the sheet thickness was thin, the stiffness of the molded product was weak, and the cleaving property as a deep-drawn molded product was slightly lowered.
In Example 4, the cleaving property was good, but the deep drawability was slightly inferior because the sheet thickness was thick.

比較例1は、表層のGPPS含有比率が低いため、割断性が劣った。
比較例2は、表層のGPPS含有比率が高く、シート引張伸びが10%未満であり、直線状に綺麗に割断されなかった。
比較例3は、シート総厚に対する表層厚の比率が小さく、シート引張伸びが100%を超え、引張弾性率は1500MPa未満であり、割断性が劣った。
比較例4は、ヒートシール厚が大きく、ヒートシール層の割断が不十分であった。
Since Comparative Example 1 had a low GPPS content ratio in the surface layer, the cleaving property was inferior.
In Comparative Example 2, the GPPS content ratio of the surface layer was high, the sheet tensile elongation was less than 10%, and the sheet was not cleaved cleanly in a straight line.
In Comparative Example 3, the ratio of the surface layer thickness to the total sheet thickness was small, the sheet tensile elongation exceeded 100%, the tensile elastic modulus was less than 1500 MPa, and the cleaving property was inferior.
In Comparative Example 4, the heat seal thickness was large, and the heat seal layer was not sufficiently cleaved.

本発明の深絞り成型用多層シートによれば、手で容易に開口部を割断または破断することができるので、ユニバーサルデザイン化に適した、より簡便な構造や形状の包装体や開口部を設計・製造でき、製造者および使用者の利便性、経済性が大いに向上する。   According to the multilayer sheet for deep drawing of the present invention, the opening can be easily cleaved or broken by hand, so a package or opening having a simpler structure and shape suitable for universal design is designed. -It can be manufactured, and the convenience and economy of the manufacturer and user are greatly improved.

1 表層
2 ヒートシール層
3 収容部
4 接着層
5 PETG層および/または環状PO層
6 EVOH層および/またはMXD層
DESCRIPTION OF SYMBOLS 1 Surface layer 2 Heat seal layer 3 Storage part 4 Adhesive layer 5 PETG layer and / or cyclic | annular PO layer 6 EVOH layer and / or MXD layer

Claims (8)

非発泡のポリスチレン系樹脂(PS)を含む表層とポリオレフィン系樹脂からなるヒートシール層とを有する、少なくとも2層以上の多層シートにおいて、次の(a)〜(d)の条件を満たすことを特徴とする深絞り成型用多層シート。
(a)表層における汎用ポリスチレン樹脂(GPPS)の含有比率が30質量%を超え80質量%未満
(b)総厚に対する表層の層厚比率が50%以上95%以下
(c)ヒートシール層の層厚が5μm以上100μm未満
(d)長辺10cm短辺2cmのシート短冊片をハーフカットなしで、ヒートシール層を内向きに、短辺端を合わせるように屈曲させる試験において、短辺方向に直線状に割断できる
A multilayer sheet having at least two layers having a surface layer containing a non-foamed polystyrene resin (PS) and a heat seal layer made of a polyolefin resin, satisfying the following conditions (a) to (d): Multi-layer sheet for deep drawing.
(A) The content ratio of the general-purpose polystyrene resin (GPPS) in the surface layer is more than 30% by mass and less than 80% by mass (b) The layer thickness ratio of the surface layer to the total thickness is 50% or more and 95% or less (c) Layer of heat seal layer (D) In a test in which a sheet strip with a long side of 10 cm and a short side of 2 cm is bent without a half cut, the heat seal layer faces inward, and the short side ends are aligned. Can be cleaved
JIS K 7127法によるシートの引張伸びが10%以上100%以下および引張弾性率が1500MPa以上3000MPa以下、かつ、シート総厚が300μm以上1000μm以下である請求項1に記載の深絞り成形用多層シート。   The multilayer sheet for deep drawing according to claim 1, wherein the tensile elongation of the sheet according to JIS K 7127 is 10% or more and 100% or less, the tensile modulus is 1500 MPa or more and 3000 MPa or less, and the total sheet thickness is 300 µm or more and 1000 µm or less. . 中間層としてエチレン−酢酸ビニル共重合体けん化物(EVOH)層、および/またはメタキシレンジアミン系ポリアミド樹脂層を前記表層と前記ヒートシール層との間に配する請求項1または2に記載の深絞り成型用多層シート。   The depth according to claim 1 or 2, wherein an ethylene-vinyl acetate copolymer saponified product (EVOH) layer and / or a metaxylenediamine-based polyamide resin layer is disposed as an intermediate layer between the surface layer and the heat seal layer. Multi-layer sheet for drawing. 前記表層の非発泡のポリスチレン系樹脂(PS)が、汎用ポリスチレン樹脂と、耐衝撃性ポリスチレンまたはスチレン−ブタジエン共重合体との2成分である請求項1〜3の何れかに記載の深絞り成形用多層シート。   The deep drawing molding according to any one of claims 1 to 3, wherein the non-foamed polystyrene resin (PS) of the surface layer is a two-component of a general-purpose polystyrene resin and an impact-resistant polystyrene or a styrene-butadiene copolymer. Multilayer sheet. 前記ヒートシール層を構成する樹脂が、環状ポリオレフィン系樹脂である請求項1〜4の何れかに記載の深絞り成形用多層シート。   The deep drawing multilayer sheet according to any one of claims 1 to 4, wherein the resin constituting the heat seal layer is a cyclic polyolefin resin. 前記表層の外側表面上に、環状ポリオレフィン系樹脂および/または非晶ポリエステル系樹脂からなる層を有する請求項1〜5の何れかに記載の深絞り成型用多層シート。   The multilayer sheet for deep drawing according to any one of claims 1 to 5, further comprising a layer made of a cyclic polyolefin resin and / or an amorphous polyester resin on the outer surface of the surface layer. 前記多層シートが、共押出多層シートである請求項1〜6の何れかに記載の深絞り成型用多層シート。   The multilayer sheet for deep drawing according to any one of claims 1 to 6, wherein the multilayer sheet is a coextruded multilayer sheet. 割断開封する深絞り容器に用いる請求項1〜7の何れかに記載の深絞り成形用多層シート。   The multilayer sheet for deep drawing according to any one of claims 1 to 7, which is used for a deep drawing container to be cleaved and opened.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0911413A (en) * 1995-06-30 1997-01-14 Mitsubishi Plastics Ind Ltd Co-extruded multilayer film for deep draw forming
JP2000052505A (en) * 1998-06-03 2000-02-22 Nippon Polystyrene Kk Easily unsealable container and member used therefor
JP2002120334A (en) * 2000-10-13 2002-04-23 Jsp Corp Foamed, laminated polystyrene resin multi-layer body, container main body, food packaging container, and food package
JP2003231515A (en) * 2002-02-08 2003-08-19 Idemitsu Unitech Co Ltd Liquid sealing container
JP2006035449A (en) * 2004-07-22 2006-02-09 Mitsubishi Plastics Ind Ltd Coextrusion composite film for lid material of distribution package
JP2006036347A (en) * 2004-07-30 2006-02-09 Mitsubishi Plastics Ind Ltd Coextruded film for lid material for distribution package
JP2006256256A (en) * 2005-03-18 2006-09-28 Mitsubishi Plastics Ind Ltd Coextrusion film for lid material of distribution package

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0911413A (en) * 1995-06-30 1997-01-14 Mitsubishi Plastics Ind Ltd Co-extruded multilayer film for deep draw forming
JP2000052505A (en) * 1998-06-03 2000-02-22 Nippon Polystyrene Kk Easily unsealable container and member used therefor
JP2002120334A (en) * 2000-10-13 2002-04-23 Jsp Corp Foamed, laminated polystyrene resin multi-layer body, container main body, food packaging container, and food package
JP2003231515A (en) * 2002-02-08 2003-08-19 Idemitsu Unitech Co Ltd Liquid sealing container
JP2006035449A (en) * 2004-07-22 2006-02-09 Mitsubishi Plastics Ind Ltd Coextrusion composite film for lid material of distribution package
JP2006036347A (en) * 2004-07-30 2006-02-09 Mitsubishi Plastics Ind Ltd Coextruded film for lid material for distribution package
JP2006256256A (en) * 2005-03-18 2006-09-28 Mitsubishi Plastics Ind Ltd Coextrusion film for lid material of distribution package

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