JPH0686110B2 - Heat seal material for liquid containers - Google Patents
Heat seal material for liquid containersInfo
- Publication number
- JPH0686110B2 JPH0686110B2 JP61227057A JP22705786A JPH0686110B2 JP H0686110 B2 JPH0686110 B2 JP H0686110B2 JP 61227057 A JP61227057 A JP 61227057A JP 22705786 A JP22705786 A JP 22705786A JP H0686110 B2 JPH0686110 B2 JP H0686110B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- polyester resin
- laminated
- resin
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Packages (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、液体容器として用いられる包装体に使用する
ための熱封着材料に関するものであり、内容物の変味，
異臭の生じない包装材を提供するものである。TECHNICAL FIELD The present invention relates to a heat-sealing material for use in a package used as a liquid container.
It is intended to provide a packaging material that does not generate an offensive odor.
従来、液体容器として用いられる包装体は、ポリエチレ
ン，ポリプロピレンなどのポリオレフィン樹脂を包装体
の内容物と接触する面の熱封着材料として一般的に使用
していた。しかし、これらポリオレフィン樹脂には次の
ような欠点があった。Conventionally, a package used as a liquid container has generally used a polyolefin resin such as polyethylene or polypropylene as a heat-sealing material for the surface that comes into contact with the contents of the package. However, these polyolefin resins have the following drawbacks.
イ）ポリオレフィン樹脂は、フィルムに加工する過程で
熱分解を起すと、脂肪族炭化水素などの揮発性成分が発
生し、この揮発性成分が内容物に移行して、内容物の変
味，異臭が生じる原因となる。B) When a polyolefin resin undergoes thermal decomposition in the process of processing into a film, volatile components such as aliphatic hydrocarbons are generated, and these volatile components migrate to the contents, causing the contents to change in taste and smell. May cause.
ロ）ポリオレフィン樹脂は、内容物中の着香成分を吸
着、或いは透過し易く、この為、内容物の風味が変り易
い。(B) The polyolefin resin easily adsorbs or permeates a flavoring component in the content, and thus the flavor of the content is likely to change.
上記のような欠点を改善するために揮発性物質の発生が
少なく、しかも保香性の良好なポリエチレンテレフタレ
ート樹脂を、食品と接触するヒートシール層として用い
る事が提案されている。しかしながら、ポリエチレンテ
レフタレート樹脂単独では、熱封着強度および衝撃強度
が弱く実用化が困難であった。In order to improve the above-mentioned drawbacks, it has been proposed to use a polyethylene terephthalate resin having a small amount of volatile substances and a good aroma retaining property as a heat-sealing layer which comes into contact with food. However, the polyethylene terephthalate resin alone has a weak heat sealing strength and impact strength and is difficult to put into practical use.
また、特開昭60−48344号公報には、ヒートシール層と
してポリオレフィン系樹脂を積層したポリエステルフィ
ルムを用いる事により耐衝撃性が向上する旨記載されて
いるが、ポリオレフィン系樹脂とポリエステルフィルム
間の接着強度が不十分な為、充分な改良効果が得られな
かった。Further, JP-A-60-48344 describes that impact resistance is improved by using a polyester film laminated with a polyolefin resin as a heat-sealing layer. However, between the polyolefin resin and the polyester film, Since the adhesive strength was insufficient, a sufficient improvement effect could not be obtained.
本発明は、上記した従来のヒートシール層の有する欠点
を改良し、内容物の変味，異臭が生じず、しかも熱封着
性能の良好な包装材を提供することを目的とする。An object of the present invention is to improve the above-mentioned drawbacks of the conventional heat-sealing layer, and to provide a packaging material which does not cause a change in the contents or smell and which has a good heat-sealing performance.
本発明者は、上記の問題点を解決すべく研究の結果、液
体容器用のヒートシール材料として、内容物と接触する
面にガラス転移温度（Tg）が40℃以上のポリエステル樹
脂を使用し、このものを引張弾性率が10,000Kg/cm2以下
のポリエステル樹脂と積層することにより本発明をなし
たものである。The present inventors, as a result of research to solve the above problems, as a heat-sealing material for a liquid container, a glass transition temperature (Tg) 40 ° C. or higher polyester resin on the surface in contact with the content, The present invention is made by laminating this with a polyester resin having a tensile elastic modulus of 10,000 Kg / cm 2 or less.
ポリエステル樹脂がすぐれた保香性を示すのは、包装体
に充填される内容物の温度が、ポリエステル樹脂のガラ
ス転移温度（Tg）以下の場合である。この為、内容物と
接触する面には少なくともTgが40℃以上のポリエステル
樹脂を使用する必要がある。しかしながらこのようなポ
リエステル樹脂は、引張弾性率が高い為、熱封着部に衝
撃が加わった場合破壊しやすい。ところが、これに引張
弾性率が10,000Kg/cm2以下のポリエステル樹脂を積層し
一体化する事により、ヒートシール層の引張弾性率が低
下し良好な熱封着性能を得る事ができる。異なる引張弾
性率をもつ樹脂を一体化するには、同種樹脂である必要
があり、本発明においてはポリエステル樹脂が使用され
る。積層方法は、共押出法が望ましいが、層間接着強度
が十分強く剥離不可能であれば、他の方法も用いる事が
できる。又、ポリエステル樹脂は、可能な限り、低結晶
性のものがよく、結晶化度が高いと透明性やシール部の
劣化が大きくなってしまう。The polyester resin exhibits excellent fragrance retention when the temperature of the contents filled in the package is equal to or lower than the glass transition temperature (Tg) of the polyester resin. Therefore, it is necessary to use at least a polyester resin having Tg of 40 ° C. or higher on the surface that comes into contact with the contents. However, since such a polyester resin has a high tensile elastic modulus, it is easily broken when an impact is applied to the heat-sealed portion. However, by laminating and integrating a polyester resin having a tensile elastic modulus of 10,000 Kg / cm 2 or less on this, the tensile elastic modulus of the heat-sealing layer is lowered and good heat sealing performance can be obtained. In order to integrate resins having different tensile elastic moduli, it is necessary that they are the same kind of resin, and a polyester resin is used in the present invention. The lamination method is preferably a co-extrusion method, but other methods can be used as long as the interlayer adhesion strength is sufficiently strong and peeling is not possible. In addition, the polyester resin is preferably as low crystalline as possible, and if the degree of crystallinity is high, the transparency and the deterioration of the seal portion are increased.
Tgが40℃以上のポリエステル樹脂層は、引張弾性率が高
い為、50μ以下であることが必要であり、これ以上の厚
みでは、積層する引張弾性率の低い樹脂層をかなり厚く
する必要があり、実際的でない。また、積層するポリエ
ステル樹脂層の弾性率は10,000Kg/cm2以下である事が必
要である。一般に実用的な熱封着材料の引張弾性率は、
14,000Kg/cm2以下と考えられるが、前記二層よりなる樹
脂における弾性率の低い樹脂層が少なくとも10,000Kg/c
m2以下の弾性率でないと、ヒートシール材料の厚みがか
なり増えてしまい実用的でない。尚、ヒートシール材料
の総厚みは40〜100μが好適である。この為、引張弾性
率10,000Kg/cm2のポリエステル樹脂の厚みは100μ以下
が望ましい。The polyester resin layer having a Tg of 40 ° C. or higher has a high tensile elastic modulus and therefore needs to have a thickness of 50 μ or less.If the thickness is more than this, it is necessary to considerably thicken the resin layer having a low tensile elastic modulus to be laminated. , Impractical. The elastic modulus of the laminated polyester resin layer must be 10,000 Kg / cm 2 or less. Generally, the tensile elastic modulus of a practical heat sealing material is
It is considered to be 14,000 Kg / cm 2 or less, but the resin layer having a low elastic modulus in the resin composed of the two layers is at least 10,000 Kg / c.
If the elastic modulus is not less than m 2, the thickness of the heat seal material will be considerably increased, which is not practical. The total thickness of the heat seal material is preferably 40-100 μm. Therefore, it is desirable that the thickness of the polyester resin having a tensile elastic modulus of 10,000 kg / cm 2 be 100 μm or less.
本発明においては内容物と接触する面にガラス転移温度
が40℃以上のポリエステル樹脂を用いているので保香性
が良好であり、しかもこのポリエステル樹脂に引張弾性
率が10,000Kg/cm2以下のポリエステル樹脂を積層して一
体化したのでヒートシール層の引張弾性率が低下し、衝
撃に強い良好な熱封着性能を有するヒートシール材料と
することができたものである。In the present invention, the glass transition temperature is 40 ° C. or more on the surface that comes into contact with the contents, so that the fragrance-retaining property is good, and the polyester resin has a tensile elastic modulus of 10,000 Kg / cm 2 or less. Since the polyester resins are laminated and integrated, the tensile elastic modulus of the heat-sealing layer is lowered, and a heat-sealing material having good heat-sealing performance that is resistant to impact can be obtained.
次に本発明のヒートシール材料を有する包装体の実施態
様を図面によって説明する。本発明のヒートシール材料
よりなるヒートシール層２は、耐熱層１と貼合すること
により、熱封着性能が良好でしかも変味，異臭の生じな
い包装体を形成できる。ここで図中１の耐熱層は200℃
程度のヒートシール温度に絶える材料である。例えば
紙，アルミニウム，二軸延伸ポリエステルフィルム，二
軸延伸ナイロンフィルム，二軸延伸ポリプロピレンフィ
ルムまたは、これらの複合体が適当であり、用途に応じ
てはポリ塩化ビニリデンなどのガスバリアー層やポリエ
チレンフィルムなどの補強層を組みあわせる事も可能で
ある。この耐熱層をヒートシール層２と貼合する。貼合
は、通常のドライラミネーション或いはヒートシール材
料を二層の共押出機で耐熱層上に押出コートするなどの
方法を用いて行なわれる。Next, an embodiment of a package having the heat-sealing material of the present invention will be described with reference to the drawings. The heat-sealing layer 2 made of the heat-sealing material of the present invention can be bonded to the heat-resistant layer 1 to form a package having good heat-sealing performance and without causing any change in taste or odor. Here, the heat-resistant layer 1 in the figure is 200 ° C.
It is a material that can withstand a heat seal temperature of a certain degree. For example, paper, aluminum, biaxially oriented polyester film, biaxially oriented nylon film, biaxially oriented polypropylene film, or a composite of these is suitable. Depending on the application, a gas barrier layer such as polyvinylidene chloride or polyethylene film, etc. It is also possible to combine the reinforcing layers of. This heat resistant layer is attached to the heat seal layer 2. The laminating is performed by a method such as ordinary dry lamination or heat-sealing material is extrusion-coated on the heat-resistant layer by a two-layer coextruder.
ヒートシール層は、Tg40℃以上のポリエステル樹脂ｂと
引張弾性率が10,000Kg/cm2以下のポリエステル樹脂ａと
の少なくとも二層の構成からなり、包装体を形成する際
は、包装体に充填される内容物と接触し互いに熱融着す
る面がTg40℃以上のポリエステル樹脂ｂとなるようにす
る。The heat-sealing layer is composed of at least two layers of a polyester resin b having a Tg of 40 ° C. or higher and a polyester resin a having a tensile elastic modulus of 10,000 Kg / cm 2 or less, and is filled in the package when forming the package. The surface of the polyester resin b having a Tg of 40 ° C. or higher that contacts with the contents and is heat-sealed with each other.
以下に実施例と比較例を示し、本発明の効果を具体的に
示す。The effects of the present invention will be specifically shown below with reference to Examples and Comparative Examples.
実施例 １ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを、反対面に70μのポリエステル樹脂Ａと15μの
ポリエステル樹脂Ｂとを積層した。該積層は通常の共押
出法にて行った。Example 1 A 12μ biaxially stretched polyester film was laminated on one side of a 9μ aluminum foil, and a 70μ polyester resin A and a 15μ polyester resin B were laminated on the opposite side. The lamination was performed by a common coextrusion method.
ポリエステル樹脂Ａは、引張弾性率2000Kg/cm2の線状飽
和ポリエステル樹脂（東洋紡績（株）製，商品名バイロ
ンGM−900）を用いて。（Tg＝−20℃）ポリエステル樹
脂Ｂは、Tgが81℃の線状飽和ポリエステル樹脂（イース
トマンコダック社製，商品名PET−G6763）を用いた。As the polyester resin A, a linear saturated polyester resin having a tensile modulus of 2000 Kg / cm 2 (manufactured by Toyobo Co., Ltd., trade name Byron GM-900) is used. (Tg = −20 ° C.) As the polyester resin B, a linear saturated polyester resin having a Tg of 81 ° C. (manufactured by Eastman Kodak Company, trade name PET-G6763) was used.
実施例 ２ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを、反対面に60μの低密度ポリエチレンをドライ
ラミネート法により積層し、さらに低密度ポリエチレン
層上に共押出法で得た30μのポリエステル樹脂Ａと15μ
のポリエステル樹脂Ｂの積層フィルムをドライラミネー
ト法により積層した。尚、ポリエステル樹脂A,Bはそれ
ぞれ実施例１に記載のものを使用した。Example 2 A 12μ biaxially stretched polyester film was laminated on one side of a 9μ aluminum foil, and 60μ of low-density polyethylene was laminated on the opposite side by a dry lamination method, and further 30μ of 30μ obtained on the low-density polyethylene layer by a co-extrusion method. Polyester resin A and 15μ
The laminated film of the polyester resin B of was laminated by the dry lamination method. The polyester resins A and B used were those described in Example 1, respectively.
比較例 １ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを、反対面に100μのポリエステル樹脂Ｂ（実施
例１に記載と同様のもの）をドライラミネート法で積層
した。Comparative Example 1 A 12μ biaxially stretched polyester film was laminated on one side of a 9μ aluminum foil, and 100μ of a polyester resin B (the same as described in Example 1) was laminated on the opposite side by a dry lamination method.
比較例 ２ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを積層し、反対面に100μの低密度ポリエチレン
をドライラミネート法で積層した。Comparative Example 2 A 12μ biaxially stretched polyester film was laminated on one surface of a 9μ aluminum foil, and 100μ of low density polyethylene was laminated on the opposite surface by a dry lamination method.
比較例 ３ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを積層し、反対面に80μの低密度ポリエチレンを
ドライラミネート法で積層し、さらにこの上に15μのポ
リエステル樹脂Ｂ（実施例１に記載と同様のもの）をド
ライラミネート法で積層した。Comparative Example 3 A 12μ biaxially stretched polyester film was laminated on one side of a 9μ aluminum foil, and 80μ of low-density polyethylene was laminated on the opposite side by a dry lamination method, and further 15μ of a polyester resin B (Example 1). (The same as those described in 1.) were laminated by the dry lamination method.
比較例 ４ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを積層し、反対面に引張弾性率24,000Kg/cm2の60
μのポリエチレンテレフタレート樹脂と15μのポリエス
テル樹脂Ｂを共押出法で積層した。Comparative Example 4 A 12μ biaxially stretched polyester film was laminated on one side of a 9μ aluminum foil, and 60 having a tensile elastic modulus of 24,000 Kg / cm 2 was formed on the opposite side.
μ polyethylene terephthalate resin and 15 μ polyester resin B were laminated by a coextrusion method.
比較例 ５ ９μのアルミ箔の一面に12μの二軸延伸ポリエステルフ
ィルムを積層し、反対面に100μのポリエステル樹脂Ｂ
を積層した。Comparative Example 5 A 12μ biaxially stretched polyester film was laminated on one side of a 9μ aluminum foil, and 100μ of polyester resin B was formed on the opposite side.
Were laminated.
上記実施例1,2及び比較例１〜５において得られた積層
フィルムによって包装体を形成して200℃１秒、3Kg/cm2
の条件でヒートシールし、これを300mm/minの速度で引
きはがす張力をテンシロンにて測定して各ヒートシール
層の強度を求めた。また、100％のオレンジジュースを2
0cm×10cmの該積層フィルムによって製造した包装体に
封入し、味，臭いの変化をみた。保存条件は25℃で10日
間で、変化なしを〇、変化が大である場合を×として結
果をヒートシール層の強度と共に表に示した。A package was formed from the laminated films obtained in Examples 1 and 2 and Comparative Examples 1 to 5 at 200 ° C. for 1 second and 3 Kg / cm 2.
The heat-sealing was performed under the conditions described above, and the peeling tension of the heat-sealing layer was measured with a tensilon to obtain the strength of each heat-sealing layer. Also, 2% of 100% orange juice
It was enclosed in a package produced from the laminated film of 0 cm × 10 cm, and changes in taste and smell were observed. The storage conditions were 25 ° C. for 10 days, with no change indicated by ◯ and a large change indicated by x, and the results are shown in the table together with the strength of the heat seal layer.
上記の表に示した結果からわかるように、Tgが81℃と室
温以上であるポリエステル樹脂Ｂは、内容物に対してほ
とんど味，臭いをかえない。これは着香料などの透過，
吸着が小さい為である。しかし、このような樹脂は常温
で硬い為、ヒートシール強度が小さく実用に耐えない。
（比較例５）また、常温で柔かいポリエステル樹脂Ａや
低密度ポリエチレンは、ヒートシール強度は良好だが味
覚をかえてしまう。（比較例1,2） 〔発明の効果〕 実施例１及び実施例２に記載の本発明によるヒートシー
ル材料は、ヒートシール強度が強く内容物の変味が少な
い為、良好な包装体を形成することができる。 As can be seen from the results shown in the above table, the polyester resin B having Tg of 81 ° C. or higher than room temperature hardly gives taste and smell to the contents. This is the permeation of flavoring agents,
This is because the adsorption is small. However, since such a resin is hard at room temperature, it has a small heat seal strength and cannot be used practically.
(Comparative Example 5) Polyester resin A and low-density polyethylene, which are soft at room temperature, have good heat-sealing strength but change taste. (Comparative Examples 1 and 2) [Effects of the Invention] The heat-sealing materials according to the present invention described in Examples 1 and 2 have high heat-sealing strength and little change in contents, and thus form a good package. can do.
これは、二種類のポリエステル樹脂からなる二層構成が
有効な為である。本発明においてはガラス転移温度の高
い樹脂と柔かいポリエステル樹脂との構成が重要であ
る。低密度ポリエチレンとポリエステル樹脂の組みあわ
せ（比較例３）やかたいポリエステル樹脂との組みあわ
せ（比較例４）では実用的な包装体は得られない。This is because a two-layer structure composed of two kinds of polyester resins is effective. In the present invention, the constitution of a resin having a high glass transition temperature and a soft polyester resin is important. A combination of low-density polyethylene and a polyester resin (Comparative Example 3) and a combination of a hard polyester resin (Comparative Example 4) cannot provide a practical package.
図面は、本発明によるヒートシール材料を有する包装体
の一部拡大断面図である。 １……耐熱層,2……ヒートシール層， ａ……引張強度が10,000Kg/cm2以下のポリエステル樹脂 ｂ……ガラス転移温度が40℃以上のポリエステル樹脂The drawing is a partially enlarged sectional view of a package having the heat-sealing material according to the present invention. 1 ...... resistant layer, 2 ...... heat seal layer, a ...... tensile strength 10,000 kg / cm 2 or less of the polyester resin b ...... glass transition temperature of 40 ° C. or more polyester resins
Claims (3)
以上のポリエステル系樹脂であり、このポリエステル系
樹脂に引張弾性率10,000Kg/cm2以下のポリエステル系樹
脂が積層されていることを特徴とする液体容器用ヒート
シール材料。1. A glass transition temperature of 40 ° C. on the surface in contact with the contents.
A heat-sealing material for a liquid container, which is the above-mentioned polyester resin, wherein a polyester resin having a tensile elastic modulus of 10,000 Kg / cm 2 or less is laminated on the polyester resin.
系樹脂の厚みが50μ以下であることを特徴とする特許請
求の範囲第１項に記載の液体容器用ヒートシール材料。2. The heat-sealing material for a liquid container according to claim 1, wherein the polyester resin having a glass transition temperature of 40 ° C. or more has a thickness of 50 μm or less.
系樹脂が非結晶性樹脂であることを特徴とする特許請求
の範囲第１項に記載の液体容器用ヒートシール材料。3. The heat-sealing material for a liquid container according to claim 1, wherein the polyester resin having a glass transition temperature of 40 ° C. or higher is an amorphous resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61227057A JPH0686110B2 (en) | 1986-09-25 | 1986-09-25 | Heat seal material for liquid containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61227057A JPH0686110B2 (en) | 1986-09-25 | 1986-09-25 | Heat seal material for liquid containers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6381042A JPS6381042A (en) | 1988-04-11 |
| JPH0686110B2 true JPH0686110B2 (en) | 1994-11-02 |
Family
ID=16854852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61227057A Expired - Fee Related JPH0686110B2 (en) | 1986-09-25 | 1986-09-25 | Heat seal material for liquid containers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0686110B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5382652A (en) * | 1991-04-01 | 1995-01-17 | Toyo Boseki Kabushiki Kaisha | Polyester resin, compositions thereof and sealant made therefrom |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4932983A (en) * | 1972-07-27 | 1974-03-26 | ||
| JPS5624165A (en) * | 1979-07-30 | 1981-03-07 | Tetra Pak Dev | Heattsealing laminated material |
| JPS5959435A (en) * | 1982-09-30 | 1984-04-05 | 藤森工業株式会社 | Composite packing material |
| JPS6048344A (en) * | 1983-08-26 | 1985-03-16 | 藤森工業株式会社 | Composite packing material |
| JPS6052337A (en) * | 1983-08-31 | 1985-03-25 | 東洋紡績株式会社 | Laminated polyester film for food vessel |
| JPS6036225B2 (en) * | 1980-12-02 | 1985-08-19 | 保土谷化学工業株式会社 | Basic dye liquid composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6036225U (en) * | 1983-08-22 | 1985-03-13 | 大日本印刷株式会社 | container for liquids |
-
1986
- 1986-09-25 JP JP61227057A patent/JPH0686110B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4932983A (en) * | 1972-07-27 | 1974-03-26 | ||
| JPS5624165A (en) * | 1979-07-30 | 1981-03-07 | Tetra Pak Dev | Heattsealing laminated material |
| JPS6036225B2 (en) * | 1980-12-02 | 1985-08-19 | 保土谷化学工業株式会社 | Basic dye liquid composition |
| JPS5959435A (en) * | 1982-09-30 | 1984-04-05 | 藤森工業株式会社 | Composite packing material |
| JPS6048344A (en) * | 1983-08-26 | 1985-03-16 | 藤森工業株式会社 | Composite packing material |
| JPS6052337A (en) * | 1983-08-31 | 1985-03-25 | 東洋紡績株式会社 | Laminated polyester film for food vessel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6381042A (en) | 1988-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |