JP2515239Y2 - Food container - Google Patents
Food containerInfo
- Publication number
- JP2515239Y2 JP2515239Y2 JP1991008097U JP809791U JP2515239Y2 JP 2515239 Y2 JP2515239 Y2 JP 2515239Y2 JP 1991008097 U JP1991008097 U JP 1991008097U JP 809791 U JP809791 U JP 809791U JP 2515239 Y2 JP2515239 Y2 JP 2515239Y2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- sheet
- glass transition
- transition point
- food container
- 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 - Lifetime
Links
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Laminated Bodies (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、低コストで且つ成形
性、強度、耐熱性及び耐油性に優れる、電子レンジでそ
のまま加熱調理するのに好適な食品容器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food container which is low in cost and excellent in moldability, strength, heat resistance and oil resistance, and which is suitable for cooking directly in a microwave oven.
【０００２】[0002]
【従来の技術】最近、電子レンジ用容器として、各種素
材からなるものが提案されている。また、従来より食品
を収納する容器として、断熱性を発揮させるために発泡
ポリスチレンシートを成形してなる容器が使用されてき
た。しかし乍ら、断熱性に優れた上記発泡スチレンシー
ト製容器も電子レンジ等への使用については充分な耐熱
性を保有し得ず、短時間で変形を生じ、電子レンジ用耐
熱容器としては殆ど実用に耐えぬるものであった。2. Description of the Related Art Recently, containers made of various materials have been proposed as microwave oven containers. Further, conventionally, as a container for storing food, a container formed by molding a foamed polystyrene sheet in order to exert heat insulating property has been used. However, the above-mentioned foamed styrene sheet container, which has excellent heat insulating properties, also cannot have sufficient heat resistance for use in microwave ovens, etc., and it deforms in a short time, making it almost practical as a heat-resistant container for microwave ovens. I could not stand it.
【０００３】この問題を解決するために、より耐熱性を
高めたポリフェニレンエーテル／ポリスチレンの混合樹
脂を発泡して得たシートを使用し、さらにポリフェニレ
ンエーテル／ポリスチレン発泡シート単体では、成形
性、剛性が不足するために、上記シートの片側にガラス
転移点の高い熱可塑性樹脂をラミネートすることが提案
されている（実公昭６３−３１９５７）。In order to solve this problem, a sheet obtained by foaming a mixed resin of polyphenylene ether / polystyrene having higher heat resistance is used. Due to the shortage, it has been proposed to laminate a thermoplastic resin having a high glass transition point on one side of the sheet (Jitsuko 63-31957).
【０００４】しかるに、ガラス転移点の高い熱可塑性樹
脂は高価であり、したがって、得られた容器も高価であ
り、また成形性も良くなく、成形性及びコストの面で改
善が要望されていた。However, a thermoplastic resin having a high glass transition point is expensive, therefore the obtained container is also expensive, and the moldability is not good, and improvement in moldability and cost has been demanded.
【０００５】[0005]
【考案が解決しようとする課題】本考案は上記実情に鑑
み、低コストで且つ成形性、強度、耐熱性及び耐油性に
優れた食品容器を提供することを目的とする。In view of the above situation, an object of the present invention is to provide a food container which is low in cost and excellent in moldability, strength, heat resistance and oil resistance.
【０００６】[0006]
【課題を解決するための手段】本考案者らは、上記課題
を解決するべく種々検討の結果、例えば基材となるポリ
フェニレン／ポリスチレンの混合樹脂発泡シートと安価
であるポリスチレン系樹脂フィルム又はシートを積層す
ることにより、比較的熱変形のおこりやすいポリスチレ
ン系樹脂フィルム又はシートであっても前記ポリフェニ
レンエーテル系発泡シートにささえられて耐熱性を保持
することができ、且つ成形性、強度、耐油性に優れた容
器を安価に提供できることを見出し本考案を完成した。Means for Solving the Problems As a result of various studies to solve the above-mentioned problems, the inventors of the present invention have selected, for example, a polyphenylene / polystyrene mixed resin foamed sheet as a base material and an inexpensive polystyrene-based resin film or sheet. By laminating, even if it is a polystyrene resin film or sheet that is relatively susceptible to thermal deformation, it can be held by the polyphenylene ether foam sheet to maintain heat resistance, and moldability, strength, and oil resistance The inventors have completed the present invention by finding that excellent containers can be provided at low cost.
【０００７】即ち、本考案は耐熱性樹脂を基材樹脂とす
る発泡シートの少なくとも片面に、前記基材樹脂のガラ
ス転移点よりも１〜５０℃低いガラス転移点を有する熱
可塑性樹脂のフィルム又はシートを積層した複合シート
を成形してなる食品容器を内容とする。That is, the present invention provides a film of a thermoplastic resin having a glass transition point which is 1 to 50 ° C. lower than the glass transition point of the base resin on at least one surface of a foamed sheet containing a heat resistant resin as a base resin. A food container formed by molding a composite sheet in which sheets are laminated is included.
【０００８】耐熱性発泡シートに成形性、剛性等を付与
するための従来の技術は、前記した如く、該発泡シート
のガラス転移点よりも高いガラス転移点を有する熱可塑
性樹脂フィルム又はシートを積層してなるが、耐熱性は
良好であるものの成形性及び価格面で充分ではない。As described above, the conventional technique for imparting moldability, rigidity and the like to a heat resistant foamed sheet is to laminate a thermoplastic resin film or sheet having a glass transition point higher than the glass transition point of the foamed sheet. Although the heat resistance is good, the moldability and the price are not sufficient.
【０００９】本考案者らはこの原因について研究した結
果、樹脂は発泡させるとガラス転移点そのものは変化し
ないものの、実際の熱変形温度は低下し、したがって、
耐熱性発泡シートと熱可塑性合成樹脂フィルム又はシー
トからなる複合シートの熱変形温度は、たとえ発泡シー
トの基材樹脂のガラス転移点＝フィルム又はシートの樹
脂のガラス転移点であっても、フィルム又はシートの熱
変形温度＞発泡シートの熱変形温度となること、そし
て、フィルム又はシートに合わせて成形温度を決定する
と発泡シートに対しては温度が高過ぎる結果となり、逆
に発泡シートに合わせて成形温度を決定すると、フィル
ム又はシートに対しては温度が低過ぎる結果となること
を見出した。The inventors of the present invention have studied the cause of this problem. As a result, when the resin is foamed, the glass transition point itself does not change, but the actual heat distortion temperature decreases, and therefore,
The heat distortion temperature of a composite sheet consisting of a heat-resistant foam sheet and a thermoplastic synthetic resin film or sheet is such that even if the glass transition point of the base resin of the foam sheet = the glass transition point of the resin of the film or sheet, the film or Heat distortion temperature of sheet> heat distortion temperature of foamed sheet, and if the molding temperature is determined according to the film or sheet, the temperature will be too high for the foamed sheet, and conversely molding according to the foamed sheet It has been found that determining the temperature results in too low a temperature for the film or sheet.
【００１０】このことは、フィルム又はシートの樹脂の
ガラス転移点が発泡シートの基材樹脂のガラス転移点よ
りも高くなればなる程成形が困難になることを意味して
いる。更に、発泡シート側に過大な温度を加えると発泡
する等の問題が生じる。This means that molding becomes more difficult as the glass transition point of the resin of the film or sheet becomes higher than the glass transition point of the base resin of the foamed sheet. Furthermore, if excessive temperature is applied to the foamed sheet side, problems such as foaming occur.
【００１１】本考案は上記知見に基づき完成されたもの
である。本考案を実施態様を示す図面に基づいて説明す
ると、第１図において、本考案の食品容器は耐熱性樹脂
を基材樹脂とする発泡シート（１）の片面に、該基材樹
脂のガラス転移点よりも１〜５０℃低いガラス転移点を
有する熱可塑性樹脂のフィルム（又はシート）（２）が
積層された複合シートから成形されている。The present invention has been completed based on the above findings. The present invention will be described with reference to the drawings showing an embodiment. In FIG. 1, the food container of the present invention has a glass transition of the base resin on one side of a foamed sheet (1) whose base resin is a heat-resistant resin. It is molded from a composite sheet in which a film (or sheet) (2) of a thermoplastic resin having a glass transition point lower by 1 to 50 ° C. than the point is laminated.
【００１２】本考案に用いられる発泡シートの基材樹脂
である耐熱性樹脂としては、ポリフェニレン系樹脂１０
〜７０重量％とポリスチレン系樹脂９０〜３０重量％と
の混合樹脂が好適で、コスト面を考慮すればポリフェニ
レン系樹脂２５〜５５重量％とポリスチレン系樹脂７５
〜４５重量％との混合樹脂がより好適である。該混合樹
脂にブタン等の発泡剤を加えて発泡させ発泡シートを得
る。発泡シートの発泡倍率は３〜３０倍、厚さは１〜５
mmの範囲が好適である。The heat-resistant resin which is the base resin of the foamed sheet used in the present invention is polyphenylene resin 10
A mixed resin of 70 to 70% by weight and polystyrene resin 90 to 30% by weight is preferable, and in view of cost, 25 to 55% by weight of polyphenylene resin and 75 to polystyrene resin.
A mixed resin with ˜45% by weight is more preferred. A foaming agent such as butane is added to the mixed resin and foamed to obtain a foamed sheet. The expansion ratio of the foam sheet is 3 to 30 times, and the thickness is 1 to 5
The mm range is preferred.
【００１３】本考案に用いられる熱可塑性樹脂フィルム
又はシートとしては、上記発泡シートの基材樹脂のガラ
ス転移点よりも１〜５０℃、好ましくは５〜１５℃低い
ガラス転移点を有するものが用いられ、ポリフェニレン
系樹脂とポリスチレン系樹脂との混合樹脂、２軸延伸ポ
リスチレン、無延伸ポリスチレン、ハイインパクトポリ
スチレン等のポリスチレン系樹脂が好適である。熱可塑
性樹脂フィルム又はシートの厚さは２５〜１５０μｍが
好ましい。発泡シートのガラス転移点とフィルム又はシ
ートのガラス転移点の差が１℃よりも小さくても、或い
は５０℃よりも大きくても良好な成形性が得られない。
尚、ガラス転移点の測定方法としては、本考案では示差
走査熱量計（ＤＳＣ）で測定し、昇温速度は５℃／分と
する。また樹脂の混合が行なわれる場合で、完全にアロ
イ化しているときは混合品のガラス転移点を使用し、混
合状態が不十分の場合は、成分樹脂の加重平均値を用い
ることとする。As the thermoplastic resin film or sheet used in the present invention, one having a glass transition point lower than that of the base resin of the foamed sheet by 1 to 50 ° C., preferably 5 to 15 ° C. is used. Polystyrene resin such as a mixed resin of polyphenylene resin and polystyrene resin, biaxially stretched polystyrene, non-stretched polystyrene, high impact polystyrene and the like is preferable. The thickness of the thermoplastic resin film or sheet is preferably 25 to 150 μm. If the difference between the glass transition point of the foamed sheet and the glass transition point of the film or sheet is smaller than 1 ° C or larger than 50 ° C, good moldability cannot be obtained.
In the present invention, the glass transition point is measured by a differential scanning calorimeter (DSC), and the heating rate is 5 ° C./min. When the resins are mixed, the glass transition point of the mixed product is used when the alloy is completely alloyed, and the weighted average value of the component resins is used when the mixed state is insufficient.
【００１４】熱可塑性樹脂フィルム又はシートは発泡シ
ートの片面又は両面に積層される。積層方法はバインダ
ーラミネート（エクストリュージョンラミネート）、熱
ラミネート、ホットメルトラミネート等のいずれでもよ
い。The thermoplastic resin film or sheet is laminated on one side or both sides of the foamed sheet. The laminating method may be any of binder laminating (extrusion laminating), thermal laminating, hot melt laminating and the like.
【００１５】上記発泡シートの基材樹脂であるポリフェ
ニレン系樹脂とポリスチレン系樹脂との混合樹脂及びフ
ィルム又はシートの樹脂であるポリスチレン系樹脂との
積層は、ともに非晶質同士の積層であるため、ガラス転
移点の低いフィルム又はシートを積層しても、より耐熱
性の高い発泡シートに支えられ複合シートとしての耐熱
性を保持できるものと考えられる。Since the laminated resin of the polyphenylene resin as the base resin of the foamed sheet and the polystyrene resin as the base resin of the foamed sheet and the polystyrene resin as the resin of the film or the sheet are both amorphous, It is considered that even if a film or sheet having a low glass transition point is laminated, the composite sheet can be maintained in heat resistance by being supported by the foam sheet having higher heat resistance.
【００１６】[0016]
【実施例】以下、実施例を挙げて本考案を更に詳細に説
明するが、本考案は該実施例のみに限定されるものでは
ない。EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
【００１７】実施例１ ポリフェニレンエーテル／ポリスチレン＝２５／７５
（ガラス転移点 １２４℃）から成る樹脂をブタンで発
泡させ、厚さ２ｍｍ、発泡倍率１０倍の発泡シートを得
た。上記発泡シートに厚さ５０μｍの２軸延伸ポリスチ
レンフィルム（ガラス転移点 ９５℃）をバインダー樹
脂（厚さ１００μｍのポリスチレン）を介して積層して
複合シートを得、該複合シートを成形して食品容器を得
た。得られた食品容器は成形性、強度、耐熱性、耐油性
をバランス良く備えていた。 実施例２ ポリフェニレンエーテル／ポリスチレン＝４０／６０
（ガラス転移点 １４０℃）からなる樹脂をブタンで発
泡させ、厚さ２ｍｍ、発泡倍率１０倍の発泡シートを得
た。上記発泡シートにポリフェニレンエーテル／ポリス
チレン＝３０／７０（ガラス転移点 １２９℃）からな
る樹脂を Ｔダイスを介して１００μｍ厚みのフィルム
状に積層してして複合シートを得、該複合シートを成形
して食品容器を得た。得られた食品容器は成形性、強
度、耐熱性、耐油性をバランス良く備えていた。 比較例１ ポリフェニレンエーテル／ポリスチレン＝３０／７０
（ガラス転移点 １２９℃）からなる樹脂をブタンで発
泡させ、厚さ２ｍｍ、発泡倍率１０倍の発泡シートを得
た。上記発泡シートにポリフェニレンエーテル／ポリス
チレン＝４０／６０（ガラス転移点 １４０℃）からな
る樹脂を Ｔダイスを介して１００μｍ厚みのフィルム
状に積層してして複合シートを得た。該複合シートを容
器成形したところ、フィルム層の伸びが不良で、目的と
する良好な食品容器を得ることができなかった。Example 1 Polyphenylene ether / polystyrene = 25/75
A resin having a glass transition point of 124 ° C. was foamed with butane to obtain a foamed sheet having a thickness of 2 mm and a foaming ratio of 10 times. A biaxially stretched polystyrene film having a thickness of 50 μm (glass transition point 95 ° C.) is laminated on the foamed sheet via a binder resin (polystyrene having a thickness of 100 μm) to obtain a composite sheet, and the composite sheet is molded to form a food container. Got The obtained food container had a good balance of moldability, strength, heat resistance and oil resistance. Example 2 Polyphenylene ether / polystyrene = 40/60
A resin having a glass transition point of 140 ° C. was foamed with butane to obtain a foamed sheet having a thickness of 2 mm and a foaming ratio of 10 times. A resin composed of polyphenylene ether / polystyrene = 30/70 (glass transition point 129 ° C.) was laminated on the foamed sheet through a T-die into a film having a thickness of 100 μm to obtain a composite sheet, and the composite sheet was molded. I got a food container. The obtained food container had a good balance of moldability, strength, heat resistance and oil resistance. Comparative Example 1 Polyphenylene ether / polystyrene = 30/70
A resin having a (glass transition point of 129 ° C.) was foamed with butane to obtain a foamed sheet having a thickness of 2 mm and a foaming ratio of 10 times. A resin composed of polyphenylene ether / polystyrene = 40/60 (glass transition point 140 ° C.) was laminated on the foamed sheet through a T-die into a film having a thickness of 100 μm to obtain a composite sheet. When the composite sheet was molded into a container, the elongation of the film layer was poor, and a desired good food container could not be obtained.
【００１８】[0018]
【考案の効果】本考案の食品容器は安価で、且つ成形
性、強度、耐熱性、耐油性をバランス良く備え、その有
用性は頗る大である。The food container of the present invention is inexpensive and has a good balance of moldability, strength, heat resistance and oil resistance, and its usefulness is outstanding.
【図１】本考案の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
１ 発泡シート ２ 熱可塑性樹脂フィルム又はシート 1 Foamed sheet 2 Thermoplastic resin film or sheet
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−46775（ＪＰ，Ａ) 実公 昭63−31957（ＪＰ，Ｙ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-46775 (JP, A) Jitsuko Shou-63-31957 (JP, Y2)
Claims (4)
の少なくとも片面に、前記基材樹脂のガラス転移点より
も１〜５０℃低いガラス転移点を有する熱可塑性樹脂の
フィルム又はシートを積層した複合シートを成形してな
る食品容器。1. A thermoplastic resin film or sheet having a glass transition point which is 1 to 50 ° C. lower than the glass transition point of the base resin is laminated on at least one surface of a foamed sheet containing a heat-resistant resin as the base resin. A food container formed by molding the composite sheet.
ラス転移点が基材樹脂のガラス転移点よりも５〜１５℃
低い請求項１記載の食品容器。2. The glass transition point of the thermoplastic resin film or sheet is 5 to 15 ° C. higher than the glass transition point of the base resin.
The food container according to claim 1, which is low.
系樹脂１０〜７０重量％とポリスチレン系樹脂９０〜３
０重量％との混合樹脂からなり、発泡倍率３〜３０倍、
厚み１〜５mmである請求項１記載の食品容器。3. The base resin of the foamed sheet comprises 10 to 70% by weight of polyphenylene resin and 90 to 3 of polystyrene resin.
Made of a mixed resin with 0% by weight, and has a foaming ratio of 3 to 30 times,
The food container according to claim 1, which has a thickness of 1 to 5 mm.
スチレン系樹脂からなる請求項１又は３記載の食品容
器。4. The food container according to claim 1, wherein the thermoplastic resin film or sheet is made of polystyrene resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991008097U JP2515239Y2 (en) | 1991-01-28 | 1991-01-28 | Food container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991008097U JP2515239Y2 (en) | 1991-01-28 | 1991-01-28 | Food container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04100476U JPH04100476U (en) | 1992-08-31 |
| JP2515239Y2 true JP2515239Y2 (en) | 1996-10-30 |
Family
ID=31740316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991008097U Expired - Lifetime JP2515239Y2 (en) | 1991-01-28 | 1991-01-28 | Food container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2515239Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6594816B2 (en) * | 2016-03-29 | 2019-10-23 | 積水化成品工業株式会社 | Multi-layer sheet for thermoforming and container |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4335181A (en) * | 1980-07-01 | 1982-06-15 | Mobil Oil Corporation | Microwaveable heat and grease resistant containers |
| JPS6331957U (en) * | 1986-08-19 | 1988-03-01 | ||
| JPS63205223A (en) * | 1987-02-20 | 1988-08-24 | 鐘淵化学工業株式会社 | Laminated foam sheet for molding |
| JPS6487339A (en) * | 1987-09-30 | 1989-03-31 | Kanegafuchi Chemical Ind | Laminated foamed sheet for molding |
-
1991
- 1991-01-28 JP JP1991008097U patent/JP2515239Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04100476U (en) | 1992-08-31 |
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