JPH1134251A - Material for food container and manufacture thereof - Google Patents
Material for food container and manufacture thereofInfo
- Publication number
- JPH1134251A JPH1134251A JP20246697A JP20246697A JPH1134251A JP H1134251 A JPH1134251 A JP H1134251A JP 20246697 A JP20246697 A JP 20246697A JP 20246697 A JP20246697 A JP 20246697A JP H1134251 A JPH1134251 A JP H1134251A
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- polypropylene
- container
- weight
- temperature
- 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.)
- Pending
Links
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、レトルト処理や電
子レンジ調理等の耐熱・断熱食品分野に使用されるトレ
ー等の食品容器材料及びその製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food container material such as a tray used in the field of heat-resistant and heat-insulated foods such as retort treatment and microwave cooking, and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、簡易食品容器用トレー、カップの
材料には、タルク等のフィラーを充填したポリプロピレ
ン（ＰＰ）シート（０．３〜０．４ｍｍ厚み）や発泡ポ
リスチレンが広く利用されていた。2. Description of the Related Art Conventionally, polypropylene (PP) sheets (0.3 to 0.4 mm thick) filled with filler such as talc and expanded polystyrene have been widely used as materials for trays and cups for simple food containers. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前者の
ポリプロピレンシートを用いて熱成形したトレー、カッ
プは、熱伝導率が大きいため、内容物の温度を伝え易
く、手に持ったときに熱いという欠点があった。However, trays and cups thermoformed using the former polypropylene sheet have a high thermal conductivity, so that the temperature of the contents can be easily transmitted, and they are hot when held in a hand. was there.
【０００４】また、後者の発泡ポリスチレンを材料とす
る容器は、断熱性に優れているが、耐熱性が不足し、１
１０°Ｃで容器が変形してしまうため、電子レンジでも
短時間加熱用にしか使えないという問題があった。Further, the latter container made of expanded polystyrene is excellent in heat insulation, but lacks heat resistance.
Since the container is deformed at 10 ° C., there is a problem that the microwave oven can be used only for short-time heating.
【０００５】さらに、最近では、ポリプロピレンの発泡
体（発泡倍率が１．５倍以下のものしかない）の成形品
も容器材料として使用されるようになっているが、発泡
倍率が低いため耐熱性能が劣るばかりでなく、コスト
（材料費）が嵩むという欠点があった。Further, recently, a molded article of a polypropylene foam (the expansion ratio is only 1.5 times or less) has been used as a container material. Not only is inferior, but also the cost (material cost) increases.
【０００６】本発明は上記の種々の課題を解決するため
のものであり、特に、耐熱と断熱特性に優れた食品容器
材料及びその製造方法を提供することを目的としてい
る。The present invention has been made to solve the above-mentioned various problems, and has as its object to provide a food container material excellent in heat resistance and heat insulation properties, and a method for producing the same.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は、ＭＦＲ（２３０°Ｃ）が、０．１〜１０
ｇ／１０分、融点が１６０°Ｃ以上であるポリプロピレ
ン７０〜９０重量％とＭＦＲ（１９０°Ｃ）が０．０１
〜２ｇ／１０分である高密度ポリエチレンまたは融点が
１１８°Ｃ以上のリニアローデンシティポリエチレン１
０〜３０重量％からなるポリオレフィン混合物１００重
量部（Ａ）に、熱分解型発泡剤または易揮発性発泡剤
（Ｂ）を添加し、押出発泡成形により１．５から３倍に
発泡して得た厚み１．３ｍｍ以上の発泡シートの片面ま
たは両面に、厚み０．０３ｍｍ以上のポリプロピレンの
未発泡・未延伸フィルム（Ｄ）を貼合またはラミネート
して得た複合シートを食品容器材料として構成した。In order to achieve the above-mentioned object, the present invention provides an MFR (230 ° C.) having a temperature of 0.1 to 10 ° C.
g / 10 minutes, 70 to 90% by weight of polypropylene having a melting point of 160 ° C. or more and MFR (190 ° C.) of 0.01
High-density polyethylene of about 2 g / 10 min or linear low-density polyethylene 1 having a melting point of 118 ° C. or more
A pyrolytic foaming agent or a volatile foaming agent (B) is added to 100 parts by weight (A) of a polyolefin mixture consisting of 0 to 30% by weight, and foamed 1.5 to 3 times by extrusion foaming. A composite sheet obtained by laminating or laminating an unfoamed and unstretched film (D) of polypropylene having a thickness of 0.03 mm or more on one or both sides of a foamed sheet having a thickness of 1.3 mm or more was used as a food container material. .
【０００８】また、請求項２に記載の発明は、ＭＦＲ
（２３０°Ｃ）が、０．１〜１０ｇ／１０分、融点が１
６０°Ｃ以上であるポリプロピレン７０〜９０重量％と
ＭＦＲ（１９０°Ｃ）が０．０１〜２ｇ／１０分である
高密度ポリエチレンまたは融点が１１８°Ｃ以上のリニ
アローデンシティポリエチレン１０〜３０重量％からな
るポリオレフィン混合物１００重量部（Ａ）に、熱分解
型発泡剤または易揮発性発泡剤（Ｂ）を添加し、押出発
泡成形により１．５から３倍に発泡して厚み１．３ｍｍ
以上の発泡シート（Ｃ）を得、該発泡シートの片面また
は両面に厚み０．０３ｍｍ以上のポリプロピレンの未発
泡・未延伸フィルム（Ｄ）を貼合またはラミネートして
複合シートを得る食品容器材料の製造方法として構成し
た。[0008] Further, the invention according to claim 2 provides a MFR
(230 ° C.) 0.1 to 10 g / 10 min.
70 to 90% by weight of polypropylene having a temperature of 60 ° C. or more and high density polyethylene having an MFR (190 ° C.) of 0.01 to 2 g / 10 minutes or 10 to 30% by weight of a linear low density polyethylene having a melting point of 118 ° C. or more To 100 parts by weight of a polyolefin mixture (A) consisting of: a pyrolytic foaming agent or a volatile foaming agent (B), and foamed 1.5 to 3 times by extrusion foaming to a thickness of 1.3 mm
The above-mentioned foamed sheet (C) is obtained, and a non-foamed and unstretched film (D) of 0.03 mm or more of polypropylene is laminated or laminated on one or both sides of the foamed sheet to obtain a composite sheet. It was configured as a manufacturing method.
【０００９】[0009]
【発明の実施の態様】次に、本発明の実施の態様につい
て図面を参照して説明する。原料としてポリプロピレン
Ａ1 とポリエチレンＡ2 を混合してなるポリオレフィン
混合物Ａを使用する。Next, an embodiment of the present invention will be described with reference to the drawings. A polyolefin mixture A obtained by mixing polypropylene A 1 and polyethylene A 2 is used as a raw material.
【００１０】前記ポリプロピレンＡ1 は、ホモポリマー
またはブロックコポリマーであり、２３０°Ｃ、２．１
６ｋｇ荷重におけるメルトフロレート（ＭＦＲ；ＡＳＴ
ＭＤ１２３８−６５Ｔ）が０．１〜１０ｇ／１０分であ
る。真空成形時のドローダウン性の観点からは０．１〜
５．０が好ましい。ドローダウンが大きいと容器の肉厚
に偏肉を生じることから好ましくない。The polypropylene A 1 is a homopolymer or a block copolymer, and is 230 ° C., 2.1
Melt flow rate at 6 kg load (MFR; AST)
MD1238-65T) is 0.1 to 10 g / 10 min. From the viewpoint of drawdown during vacuum forming, 0.1 to
5.0 is preferred. If the drawdown is large, the thickness of the container becomes uneven, which is not preferable.
【００１１】また、前記ポリプロピレンＡ1 は耐熱性を
要求する以上、融点「ＤＳＣ（示差熱分析）により測
定」が１６０°Ｃ以上を必要とする。前記ホモポリマー
またはブロックコポリマーは通常１６３〜１６７°Ｃの
融点を有している。Further, since the polypropylene A 1 is required to have heat resistance, its melting point “measured by DSC (differential thermal analysis)” needs to be 160 ° C. or more. The homopolymer or block copolymer usually has a melting point of 163-167C.
【００１２】前記ポリエチレンＡ2 は、低圧法重合によ
る高密度ポリエチレン（ＨＤＰＥ）または中，低圧法に
より重合されるリニアローデンシティポリエチレン（Ｌ
ＬＤＰＥ）からなる。The polyethylene A 2 is a high-density polyethylene (HDPE) obtained by low-pressure polymerization or a linear low-density polyethylene (L
LDPE).
【００１３】前記ＨＤＰＥは１９０°Ｃ，２．１６ｋｇ
荷重におけるメルトフローレート（ＭＦＲ；ＡＳＴＭ
Ｄ１２３８−６５Ｔ）が０．０１〜２ｇ／１０分であ
る。密度は０．９４５〜０．９６５ｇ／ｃｍ3 がよく、
融点は１２５から１３５°Ｃが好ましい。前記ＬＬＤＰ
Ｅの融点は１１８°Ｃ以上であればよい。密度が高いほ
ど融点が高く剛性も高いものである。The HDPE is 190 ° C., 2.16 kg
Melt flow rate under load (MFR; ASTM)
D1238-65T) is 0.01 to 2 g / 10 min. The density is preferably 0.945 to 0.965 g / cm 3 ,
The melting point is preferably from 125 to 135 ° C. The LLDP
The melting point of E may be 118 ° C. or higher. The higher the density, the higher the melting point and the higher the rigidity.
【００１４】前記ポリオレフィン混合物Ａを構成する前
記ポリプロピレンＡ1 とポリエチレンＡ2 との混合比率
は、Ａ1 ／Ａ2 ＝９０〜７０／１０〜３０重量％が必要
である。即ち、ポリプロピレン単独では発泡性能が悪
く、発泡倍率が上がらないためである。一方、ＨＤＰＥ
の添加量が増えると、発泡シートを真空形成するときの
ドローダウン性（シートの垂れ下がり）が改良される
が、逆に、耐熱性が悪くなること、及び後記する未発泡
・未延伸フィルム（ＣＰＰ）との接着性も悪くなること
は避けられない。[0014] mixing ratio of polypropylene A 1 and the polyethylene A 2 constituting the polyolefin mixture A, it is necessary A 1 / A 2 = 90 to 70/10 to 30 wt%. That is, the foaming performance of polypropylene alone is poor, and the foaming ratio does not increase. On the other hand, HDPE
Increases the drawdown property (sagging of the sheet) when vacuum forming the foamed sheet, but on the other hand, the heat resistance deteriorates and the unfoamed / unstretched film (CPP) described later ) Cannot be avoided.
【００１５】前記ポリオレフィン混合物Ａに、熱分解型
発泡剤または易揮発性発泡剤Ｂを添加したものを、押出
機Ｐにより押出発泡成形により１．５から３倍に発泡し
て厚みＫ＝１．３ｍｍ以上の発泡シートＣを得る。ここ
に発泡倍率を１．５から３倍に限定した理由は、１．５
倍未満であると、断熱性能が悪くなること及びコストア
ップになることを避けるためである。The mixture obtained by adding a pyrolytic foaming agent or a volatile foaming agent B to the polyolefin mixture A is foamed 1.5 to 3 times by extrusion foaming with an extruder P to have a thickness K = 1. A foam sheet C of 3 mm or more is obtained. Here, the reason why the expansion ratio is limited to 1.5 to 3 times is that the expansion ratio is 1.5 times.
If the ratio is less than twice, the heat insulating performance is prevented from being deteriorated and the cost is prevented from increasing.
【００１６】前記発泡シートＣの厚みＫを１．３ｍｍ以
上を必要とする理由は、厚みがこれより薄いと断熱性
（容器内外の温度差が小さい）が悪くなり、手に持つこ
とが出来なくなるという問題がある。しかし、あまりに
厚くなるとコストアップに繋がるため、３ｍｍ厚以下が
好ましい。The reason why the thickness K of the foam sheet C is required to be 1.3 mm or more is that if the thickness is smaller than this, the heat insulating property (the temperature difference between the inside and outside of the container is small) becomes poor, and the sheet cannot be held in the hand. There is a problem. However, if the thickness is too large, it leads to an increase in cost.
【００１７】前記発泡シートＣの片面または両面に、厚
み０．０３ｍｍ以上のポリプロピレンの未発泡・未延伸
フィルムＤを貼合またはラミネートさせて複合シートＥ
を形成する。このフィルムＤとして、延伸したポリプロ
ピレンフィルム（ＯＰＰ）を避けたのは真空成形時にフ
ィルムに伸びがなく破断するため使用できないからであ
る。An unfoamed / unstretched polypropylene film D having a thickness of 0.03 mm or more is laminated or laminated on one or both sides of the foamed sheet C to form a composite sheet E.
To form The reason why the stretched polypropylene film (OPP) was avoided as the film D was that the film was not stretched during vacuum forming and could not be used.
【００１８】前記フィルムＤを貼ることは、容器に印刷
を施すこと、艶を出して意匠性を向上させること、及び
真空形成性を向上させるために有効である。また、フィ
ルムＤの複合化は後記する真空形成時に発泡体の気泡が
潰れやすいという問題を解消させるためにも有効であ
る。Adhering the film D is effective for printing on a container, improving glossiness to improve design, and improving vacuum formability. Further, the compounding of the film D is also effective for solving the problem that bubbles of the foam are easily crushed at the time of forming a vacuum as described later.
【００１９】前記発泡シートＣに対してフィルムＤを貼
る方法として、押出ラミネーション法、熱融着法、又は
ホットメルト法等が用いられる。なお、フィルムＤの厚
みを０．０３ｍｍ以上としたのは、この厚さ未満である
と発泡シートＣへの貼合わせに難点が生じるためであ
る。As a method for attaching the film D to the foamed sheet C, an extrusion lamination method, a heat fusion method, a hot melt method, or the like is used. The reason why the thickness of the film D is set to 0.03 mm or more is that if the thickness is less than this, there is a difficulty in laminating the film D to the foam sheet C.
【００２０】一方、フィルムＤの厚みの上限を定めなか
ったのは性能上は問題ないからである。勿論、厚くなれ
ばなる程、コストアップに繋がり不経済であったりラミ
ネートが難しくなることから、０．０３ｍｍ以上、０．
１ｍｍ以下で選択することが好ましい。On the other hand, the upper limit of the thickness of the film D is not determined because there is no problem in performance. Of course, the larger the thickness, the higher the cost, the more uneconomical and the more difficult the lamination.
It is preferable to select a size of 1 mm or less.
【００２１】前記複合シートＥは真空成形機（図示せ
ず）のヒーターにて両面加熱し、表面温度１６０〜１８
０°Ｃに軟化させた後、容器金型（図示せず）にて真空
成形され、容器Ｆが成形される。この時、一般的には、
図示の如く、発泡シートＣの片面にフィルムＤが貼られ
ているときは、フィルムＤ面が容器Ｆの内側面となるよ
うにするが、場合によっては外側面となるようにするこ
ともある。The composite sheet E is heated on both sides by a heater of a vacuum forming machine (not shown) to have a surface temperature of 160-18.
After softening to 0 ° C., vacuum forming is performed in a container mold (not shown), and the container F is formed. At this time, generally,
As shown in the drawing, when the film D is attached to one surface of the foam sheet C, the surface of the film D is set to the inner surface of the container F, but may be set to the outer surface in some cases.
【００２２】前記容器Ｆの耐熱温度を見る一つの方法と
して、容器Ｆの中にサラダオイルを入れ、電子レンジに
より加熱し、サラダオイル温度が１２０°Ｃに達した時
に容器Ｆが変形等異常を発生するか否かを確認する方法
がある。容器Ｆの耐熱温度の安全性をみるならば、１３
０°Ｃ以上の耐熱変形温度をもつことが好ましいことは
勿論である。As one method of checking the heat-resistant temperature of the container F, salad oil is put in the container F, heated by a microwave oven, and when the salad oil temperature reaches 120 ° C., the container F has an abnormality such as deformation. There is a method to confirm whether it occurs. Looking at the safety of the heat-resistant temperature of the container F, 13
Of course, it is preferable to have a heat resistant deformation temperature of 0 ° C. or more.
【００２３】前記容器Ｆの断熱性能を調べる一つの方法
として、容器Ｆの中にサラダオイルを入れ、電子レンジ
により加熱し、サラダオイル温度が１２０°Ｃとなった
時、容器外壁温度との差が２０°Ｃ以上であることが目
安となる。容器Ｆの断熱性能からは内外温度差は３０°
Ｃ以上あることが好ましいものである。As one method for examining the heat insulation performance of the container F, salad oil is put in the container F, heated by a microwave oven, and when the salad oil temperature reaches 120 ° C., the difference from the outer wall temperature of the container is measured. Is 20 ° C. or more. From the heat insulation performance of container F, the temperature difference between inside and outside is 30 °
It is preferable that there be C or more.
【００２４】[0024]
【実施例１】ポリプロピレンブロックコポリマー（ＭＦ
Ｒ＝５．０ｇ／１０分、密度＝０．９１ｇ／ｃｍ3 、融
点＝１６５°Ｃ）８０重量部と高密度ポリエチレン（Ｍ
ＦＲ＝１．１ｇ／１０分、密度＝０．９５３ｇ／ｃ
ｍ3 、融点１３１°Ｃ）２０重量部とを混合し、これに
熱分解型発泡剤Ｐ−１９４１（ヘキスト社製）を５重量
部を添加し、６５ｍｍ押出機（池貝鉄工製）にて１９０
°Ｃで溶融可塑化した後、リップ開度１．２ｍｍ、温度
１８０°Ｃのダイスから押出して発泡させた。Example 1 Polypropylene block copolymer (MF
R = 5.0 g / 10 min, density = 0.91 g / cm 3 , melting point = 165 ° C.) 80 parts by weight and high density polyethylene (M
FR = 1.1 g / 10 min, density = 0.953 g / c
m 3 , melting point 131 ° C.) 20 parts by weight, and 5 parts by weight of a pyrolytic foaming agent P-1941 (manufactured by Hoechst) were added thereto, and the mixture was heated to 190 with a 65 mm extruder (manufactured by Ikegai Iron Works).
After melt plasticization at ° C, the mixture was extruded from a die having a lip opening of 1.2 mm and a temperature of 180 ° C to foam.
【００２５】このようにして得た発泡シートは、ロール
により圧着して１．５ｍｍ厚みとした。発泡体の比重は
０．４６で発泡倍率は約２倍であり、発泡セル径は微少
で均一であった。The foamed sheet thus obtained was pressed with a roll to a thickness of 1.5 mm. The specific gravity of the foam was 0.46, the expansion ratio was about 2 times, and the diameter of the foam cell was small and uniform.
【００２６】しかる後、該発泡シートの片面に、５０μ
厚の未延伸ポリプロピレンフィルム（ＣＰＰフィルム）
と４０μ厚みの溶融ポリプロピレンを接着剤とした押出
ラミネート法で貼合わせて、複合シートを得た。Thereafter, 50 μm is applied to one side of the foam sheet.
Thick unstretched polypropylene film (CPP film)
And a 40 μm-thick molten polypropylene as an adhesive by an extrusion lamination method to obtain a composite sheet.
【００２７】前記複合シートを真空成形機のヒーターに
て両面を加熱し、表面温度１６０〜１８０°Ｃに軟化さ
せた後、容器金型にて真空成形した。この時、フィルム
面は容器の内側面とした。該複合シートは加熱時のドロ
ーダウンが少なく、真空成形による絞り部分の厚み変化
が少ないものであった。なお、容器金型には１４５×２
３０、深さ３５ｍｍを用いた。The composite sheet was heated on both sides by a heater of a vacuum forming machine, softened to a surface temperature of 160 to 180 ° C., and then vacuum formed by a container mold. At this time, the film surface was the inner surface of the container. The composite sheet had a small drawdown during heating and a small change in the thickness of the drawn portion due to vacuum forming. The container mold has 145 × 2
30 and a depth of 35 mm were used.
【００２８】しかして得た容器に１５０ｃｃの内容液
（サラダオイル）を入れ、５００ｗ電子レンジに入れて
加熱し、その加熱時間とサラダオイルが昇温する度合い
を予め調べてたところ、１２０°Ｃに達する時間は３．
５分であった。電子レンジから取り出した容器の中のサ
ラダオイルに棒温度計を入れ、外壁面は赤外線温度計に
より計測した。The obtained container was charged with 150 cc of the content liquid (salad oil), placed in a 500-watt microwave oven, and heated. The heating time and the degree of temperature rise of the salad oil were examined beforehand. Time to reach 3.
5 minutes. A stick thermometer was put in the salad oil in the container taken out of the microwave oven, and the outer wall surface was measured with an infrared thermometer.
【００２９】いま、前記容器の耐熱性を見るために、該
容器が変形するまで継続加熱した結果、１４２°Ｃで変
形した。そしてサラダオイルが１３６°Ｃの時の外壁面
の温度は１０６°Ｃで、その内外の温度差は３０°Ｃで
あった。また、サラダオイルの温度が１２０°Ｃの時の
外壁面の温度は９１°Ｃで、その温度差は２９°Ｃであ
った。Now, in order to check the heat resistance of the container, the container was continuously heated until the container was deformed. As a result, the container was deformed at 142 ° C. When the salad oil was at 136 ° C., the temperature of the outer wall was 106 ° C., and the temperature difference between the inside and outside was 30 ° C. When the temperature of the salad oil was 120 ° C., the temperature of the outer wall surface was 91 ° C., and the temperature difference was 29 ° C.
【００３０】[0030]
【実施例２】上記実施例１の高密度ポリエチレン（ＨＤ
ＰＥ）として、ＭＦＲ＝０．０４ｇ／１０分、密度＝
０．９５６ｇ／ｃｍ3 、融点＝１３１°Ｃのものに替え
た。発泡倍率は１．９倍であったが、発泡シートの真空
成形時におけるドローダウン性は改良されていた。Example 2 The high-density polyethylene (HD
PE), MFR = 0.04 g / 10 min, density =
0.956 g / cm 3 , melting point = 131 ° C. The expansion ratio was 1.9, but the drawdown property during vacuum forming of the foamed sheet was improved.
【００３１】[0031]
【実施例３】実施例１のブロックポリプロピレンの混合
量を７０重量部とし、ＨＤＰＥの混合量を３０重量部と
し、その時の発泡倍率は２．１倍であり、発泡シートの
厚みは１．６ｍｍとした。これにより真空成形容器の耐
熱温度を測定した結果、サラダオイルの温度が１３６°
Ｃの時の外壁面の温度は１０２°Ｃで、内外の温度差は
３４°Ｃであった。Example 3 The mixing amount of the block polypropylene in Example 1 was 70 parts by weight, the mixing amount of HDPE was 30 parts by weight, the expansion ratio was 2.1 times, and the thickness of the expanded sheet was 1.6 mm. And As a result of measuring the heat resistant temperature of the vacuum forming container, the temperature of the salad oil was 136 °.
At the time of C, the temperature of the outer wall was 102 ° C., and the temperature difference between the inside and outside was 34 ° C.
【００３２】[0032]
【実施例４】実施例１のＨＤＰＥの代わりにＬＬＤＰＥ
（ＭＦＲ＝２．１ｇ／１０分、密度＝０．９３０ｇ／ｃ
ｍ3 、融点１２２°Ｃ）を用いた。耐熱試験の結果、変
形温度は１３８°Ｃであり電子レンジの使用に耐えるも
のであった。Embodiment 4 Instead of HDPE of Embodiment 1, LLDPE
(MFR = 2.1 g / 10 min, density = 0.930 g / c
m 3 , melting point 122 ° C.). As a result of the heat resistance test, the deformation temperature was 138 ° C., and the material could be used in a microwave oven.
【００３３】[0033]
【実施例５】実施例１において発泡シートを圧着して発
泡厚みを１．３ｍｍとしたときのサラダオイルの温度が
１３２°Ｃのとき外部温度は１１２°Ｃで温度差は２０
°Ｃと限界であった。Fifth Embodiment In the first embodiment, when the temperature of the salad oil is 132 ° C. when the foamed sheet is crimped to make the foam thickness 1.3 mm, the external temperature is 112 ° C. and the temperature difference is 20 °.
° C, which was the limit.
【００３４】[0034]
【比較例１】実施例１において、ポリプロピレンとＨＤ
ＰＥの比率を６０：４０としたところ、シートの発泡倍
率は１．９倍で、発泡シート厚みは１．４ｍｍであっ
た。容器の耐熱変形温度は１２５°Ｃであり、１３０°
Ｃに達しないものであった。Comparative Example 1 In Example 1, polypropylene and HD
When the ratio of PE was set to 60:40, the expansion ratio of the sheet was 1.9 times, and the thickness of the expanded sheet was 1.4 mm. The heat-resistant deformation temperature of the container is 125 ° C and 130 ° C
C did not reach.
【００３５】[0035]
【比較例２】実施例１において、ポリプロピレンを１０
０％とした場合、発泡シートの比重は０．６５で、発泡
倍率は１．４倍であった。発泡シートの厚みは１．１ｍ
ｍであり、真空成形時のドローダウンが大きく、偏肉の
大きな容器となった。断熱試験の結果、内容液の温度が
１２０°Ｃのとき、外壁面の温度は１０５°Ｃで内外温
度は１５°Ｃしかなく、手に持てないものであった。Comparative Example 2 In Example 1, 10
When it was set to 0%, the specific gravity of the foamed sheet was 0.65, and the expansion ratio was 1.4 times. The thickness of the foam sheet is 1.1m
m, the drawdown at the time of vacuum forming was large, and the container was large in uneven thickness. As a result of the heat insulation test, when the temperature of the content liquid was 120 ° C., the temperature of the outer wall surface was 105 ° C., and the inner and outer temperatures were only 15 ° C., and could not be held by hand.
【００３６】[0036]
【比較例３】実施例１において、ＨＤＰＥの代わりＬＤ
ＰＥ（ＭＦＲ＝７．２ｇ／１０分、密度＝０．９１２ｇ
／ｃｍ3 、融点１０６°Ｃ）を用いた。発泡倍率は２．
２倍と良好だが、発泡体の剛性が低く、耐熱試験の結果
１２６°Ｃで変形した。Comparative Example 3 In Example 1, LD was used instead of HDPE.
PE (MFR = 7.2 g / 10 min, density = 0.912 g)
/ Cm 3 , melting point 106 ° C). The expansion ratio is 2.
Although it was as good as twice, the rigidity of the foam was low and the foam deformed at 126 ° C. as a result of the heat resistance test.
【００３７】[0037]
【比較例４】実施例１において、ポリプロピレンをラン
ダムポリプロピレン（ＭＦＲ＝６．５，密度＝０．９１
ｇ／ｃｍ3 、融点＝１４０°Ｃ）とした。発泡倍率は
２．７倍と良好だが、剛性が低く、耐熱温度も１２８°
Ｃで、１３０°Ｃには達しなかった。また、真空成形時
のドローダウンが大きく偏肉の大きな容器となった。Comparative Example 4 In Example 1, the polypropylene was changed to random polypropylene (MFR = 6.5, density = 0.91).
g / cm 3 , melting point = 140 ° C.). Good expansion ratio of 2.7 times, but low rigidity and 128 ° heat resistance
C, did not reach 130 ° C. In addition, the drawdown during vacuum forming was large, resulting in a container with large uneven thickness.
【００３８】[0038]
【比較例５】実施例１の発泡体の厚みを１．２ｍｍとし
た場合において、容器内部温度が、１２９°Ｃのとき、
外部の温度は１１２°Ｃであって、内外温度差は１７°
Ｃにしかならず、目標の２０°Ｃに達しないものであっ
た。Comparative Example 5 When the thickness of the foam of Example 1 was 1.2 mm and the temperature inside the container was 129 ° C.,
The outside temperature is 112 ° C and the temperature difference between inside and outside is 17 °
C, but did not reach the target of 20 ° C.
【００３９】[0039]
【比較例６】実施例１の発泡体の厚みを１．０ｍｍとし
た場合において、容器内部温度が、１２９°Ｃのとき、
外部の温度は１１６°Ｃであって、内外温度差は１３°
Ｃにしかならず、目標の２０°Ｃに達しないものであっ
た。Comparative Example 6 When the thickness of the foam of Example 1 was 1.0 mm and the temperature inside the container was 129 ° C.,
The outside temperature is 116 ° C and the inside / outside temperature difference is 13 °
C, but did not reach the target of 20 ° C.
【００４０】[0040]
【比較例７】実施例１において、ブロックポリプロピレ
ン１００重量％とし、発泡剤の添加なしで未発泡のシー
ト０．３ｍｍ厚を成形し、ポリプロピレンフィルムを貼
ることなく、耐熱・断熱試験を行った。変形温度は１３
７°Ｃで、容器内部温度が、１２５°Ｃのとき、外部の
温度は１２０°Ｃであって、その差はわずか５°Ｃにし
かならなかった。Comparative Example 7 In Example 1, a non-foamed sheet having a thickness of 0.3 mm was formed without adding a foaming agent, and a heat and heat insulation test was conducted without attaching a polypropylene film. Deformation temperature is 13
At 7 ° C, when the temperature inside the container was 125 ° C, the temperature outside was 120 ° C, the difference being only 5 ° C.
【００４１】上記実施例１〜５、及び比較例１〜７をま
とめると、次の通りである。 材料組成 シート 発泡 熱変形 内容液 容器外 容器内外 重量部 厚み 倍率 温度 温度 部温度 温度差 ＰＰ／ＰＥ （ｍｍ）（倍） （°Ｃ）（°Ｃ）（°Ｃ）（°Ｃ） 実施例１ ８０／２０ １．５ ２．０ １４２ １３６ １０６ ３０ 実施例２ ８０／２０ １．４ １．９ １４２ １３８ １１０ ２８ 実施例３ ７０／３０ １．６ ２．１ １３８ １３６ １０２ ３４ 実施例４ ８０／２０ １．５ ２．０ １３８ １３６ １０６ ３０ 実施例５ ８０／２０ １．３ １．８ １３７ １３２ １１２ ２０ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 比較例１ ６０／４０ １．４ １．９ １２５ １２０ ９８ ２２ 比較例２ １００／０ １．１ １．４ １４５ １２０ １０５ １５ 比較例３ ８０／２０ １．７ ２．２ １２６ １２２ ８９ ３３ 比較例４ ８０／２０ ２．０ ２．７ １２８ １２５ ８５ ４０ 比較例５ ８０／２０ １．２ １．６ １３６ １２９ １１２ １７ 比較例６ ８０／２０ １．０ １．３ １３０ １２９ １１６ １３ 比較例７ １００／０ ０．３ １．０ １３７ １２５ １２０ ５ Examples 1 to 5 and Comparative Examples 1 to 7 are summarized as follows. Material Composition Sheet Foaming Thermal Deformation Content Liquid Outside Container Inside / Outside Container Weight Part Thickness Ratio Temperature Temperature Part Temperature Difference PP / PE (mm) (times) (° C) (° C) (° C) (° C) Example 1 80/20 1.5 2.0 142 136 106 30 Example 2 80/20 1.4 1.9 142 138 110 28 Example 3 70/30 1.6 2.1 138 136 102 34 Example 4 80 / 20 1.5 2.0 138 136 106 30 Example 5 80/20 1.3 1.8 137 132 112 20 --------------------------------------------------------------------- −−−−−−−−−−−− Comparative Example 1 60/40 1.4 1.9 125 120 98 22 Comparative Example 2 100/0 1.1 1.4 145 120 105 15 Comparative Example 3 80/20 1.7 2.2 126 122 89 3 Comparative Example 4 80/20 2.0 2.7 128 125 85 40 Comparative Example 5 80/20 1.2 1.6 136 129 112 17 Comparative Example 6 80/20 1.0 1.3 130 129 116 13 Comparative Example 7 100/0 0.3 1.0 137 125 120 5
【００４２】[0042]
【発明の効果】以上説明した如く、本発明はＭＦＲ（２
３０°Ｃ）が、０．１〜１０ｇ／１０分、融点が１６０
°Ｃ以上であるポリプロピレン７０〜９０重量％とＭＦ
Ｒ（１９０°Ｃ）が０．０１〜２ｇ／１０分である高密
度ポリエチレン、または融点が１１８°Ｃ以上のリニア
ローデンシティポリエチレン１０〜３０重量％からなる
ポリオレフィン混合物１００重量部（Ａ）に、熱分解型
発泡剤または易揮発性発泡剤（Ｂ）を添加し、押出発泡
成形により１．５から３倍に発泡して得た厚み１．３ｍ
ｍ以上の発泡シートの片面または両面に、厚み０．０３
ｍｍ以上のポリプロピレンの未発泡・未延伸フィルム
（Ｄ）を貼合またはラミネートして複合化したことを特
徴としているから、耐熱と断熱特性に優れた食品容器材
料を提供できるという優れた効果を奏するものである。As described above, according to the present invention, the MFR (2
30 ° C.), 0.1-10 g / 10 min, melting point 160
70 to 90% by weight of polypropylene having a temperature of at least
100 parts by weight (A) of a high-density polyethylene having an R (190 ° C.) of 0.01 to 2 g / 10 minutes or a polyolefin mixture composed of 10 to 30% by weight of a linear low-density polyethylene having a melting point of 118 ° C. or more, A thermal decomposition type foaming agent or a volatile foaming agent (B) is added, and the thickness is 1.3 m obtained by foaming 1.5 to 3 times by extrusion foaming.
m on one or both sides of the foam sheet
Since it is characterized by bonding or laminating an unfoamed and unstretched film (D) of polypropylene having a thickness of at least 1 mm to form a composite, it has an excellent effect of providing a food container material having excellent heat resistance and heat insulating properties. Things.
【００４３】また、請求項２に記載の発明は、ＭＦＲ
（２３０°Ｃ）が、０．１〜１０ｇ／１０分、融点が１
６０°Ｃ以上であるポリプロピレン７０〜９０重量％と
ＭＦＲ（１９０°Ｃ）が０．０１〜２ｇ／１０分である
高密度ポリエチレンまたは融点が１１８°Ｃ以上のリニ
アローデンシティポリエチレン１０〜３０重量％からな
るポリオレフィン混合物１００重量部（Ａ）に、熱分解
型発泡剤または易揮発性発泡剤（Ｂ）を添加し、押出発
泡成形により１．５から３倍に発泡して厚み１．３ｍｍ
以上の発泡シート（Ｃ）を得、該発泡シートの片面また
は両面に厚み０．０３ｍｍ以上のポリプロピレンの未発
泡・未延伸フィルム（Ｄ）を貼合またはラミネートして
複合化することを特徴としているから、耐熱と断熱特性
に優れた食品容器材料を簡易かつ低コストで製造できる
という優れた効果を奏するものである。The second aspect of the present invention relates to the MFR
(230 ° C.) 0.1 to 10 g / 10 min.
70 to 90% by weight of polypropylene having a temperature of 60 ° C. or more and high density polyethylene having an MFR (190 ° C.) of 0.01 to 2 g / 10 minutes or 10 to 30% by weight of a linear low density polyethylene having a melting point of 118 ° C. or more To 100 parts by weight of a polyolefin mixture (A) consisting of: a pyrolytic foaming agent or a volatile foaming agent (B), and foamed 1.5 to 3 times by extrusion foaming to a thickness of 1.3 mm
The above foamed sheet (C) is obtained, and an unfoamed / unstretched polypropylene film (D) having a thickness of 0.03 mm or more is laminated or laminated on one or both sides of the foamed sheet to form a composite. Therefore, the present invention has an excellent effect that a food container material excellent in heat resistance and heat insulation properties can be easily and inexpensively manufactured.
【図１】本発明の概要を示す説明図である。FIG. 1 is an explanatory diagram showing an outline of the present invention.
Ａ ポリオレフィン混合物 Ａ1 ポリプロピレン Ａ2 ポリエチレン Ｂ 熱分解型発泡剤または易揮発性発泡剤 Ｃ 発泡シート Ｄ 未発泡・未延伸フィルム Ｅ 複合シート Ｆ 容器 Ｐ 押出機 Ｋ 発泡シートの厚みA Polyolefin mixture A 1 Polypropylene A 2 Polyethylene B Pyrolytic foaming agent or volatile foaming agent C Foam sheet D Unfoamed / unstretched film E Composite sheet F Container P Extruder K Thickness of foam sheet
Claims (2)
ｇ／１０分、融点が１６０°Ｃ以上であるポリプロピレ
ン７０〜９０重量％とＭＦＲ（１９０°Ｃ）が０．０１
〜２ｇ／１０分である高密度ポリエチレン又は融点が１
１８°Ｃ以上のリニアローデンシティポリエチレン１０
〜３０重量％からなるポリオレフィン樹脂混合物１００
重量部（Ａ）に、熱分解型発泡剤または易揮発性発泡剤
（Ｂ）を添加し、押出発泡成形により１．５から３倍に
発泡して得た厚み１．３ｍｍ以上の発泡シートの片面ま
たは両面に、厚み０．０３ｍｍ以上のポリプロピレンの
未発泡・未延伸フィルム（Ｄ）を貼合またはラミネート
して複合化したことを特徴とする食品容器材料。An MFR (230 ° C.) of 0.1 to 10
g / 10 minutes, 70 to 90% by weight of polypropylene having a melting point of 160 ° C. or more and MFR (190 ° C.) of 0.01
High-density polyethylene having a melting point of 1 to 2 g / 10 min.
Linear low density polyethylene 10 over 18 ° C
Polyolefin resin mixture 100 consisting of -30% by weight
A foamed sheet having a thickness of 1.3 mm or more obtained by adding a pyrolytic foaming agent or an easily volatile foaming agent (B) to parts by weight (A) and foaming 1.5 to 3 times by extrusion foam molding. A food container material comprising a non-foamed and unstretched polypropylene film (D) having a thickness of 0.03 mm or more bonded or laminated on one or both sides to form a composite.
ｇ／１０分、融点が１６０°Ｃ以上であるポリプロピレ
ン７０〜９０重量％とＭＦＲ（１９０°Ｃ）が０．０１
〜２ｇ／１０分である高密度ポリエチレン又は融点が１
１８°Ｃ以上のリニアローデンシティポリエチレン１０
〜３０重量％からなるポリオレフィン樹脂混合物１００
重量部（Ａ）に、熱分解型発泡剤または易揮発性発泡剤
（Ｂ）を添加し、押出発泡成形により１．５から３倍に
発泡して厚み１．３ｍｍ以上の発泡シート（Ｃ）を得、
該発泡シートの片面または両面に厚み０．０３ｍｍ以上
のポリプロピレンの未発泡・未延伸フィルム（Ｄ）を貼
合またはラミネートして複合化することを特徴とする食
品容器材料の製造方法。2. An MFR (230 ° C.) of 0.1 to 10
g / 10 minutes, 70 to 90% by weight of polypropylene having a melting point of 160 ° C. or more and MFR (190 ° C.) of 0.01
High-density polyethylene having a melting point of 1 to 2 g / 10 min.
Linear low density polyethylene 10 over 18 ° C
Polyolefin resin mixture 100 consisting of -30% by weight
To a part by weight (A), a pyrolytic foaming agent or a volatile foaming agent (B) is added and foamed 1.5 to 3 times by extrusion foaming to form a foamed sheet (C) having a thickness of 1.3 mm or more. Get
A method for producing a food container material, comprising laminating or laminating an unfoamed / unstretched polypropylene film (D) having a thickness of 0.03 mm or more on one or both sides of the foamed sheet to form a composite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20246697A JPH1134251A (en) | 1997-07-11 | 1997-07-11 | Material for food container and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20246697A JPH1134251A (en) | 1997-07-11 | 1997-07-11 | Material for food container and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1134251A true JPH1134251A (en) | 1999-02-09 |
Family
ID=16458000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20246697A Pending JPH1134251A (en) | 1997-07-11 | 1997-07-11 | Material for food container and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1134251A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1116579A1 (en) * | 2000-01-12 | 2001-07-18 | Sumitomo Chemical Company, Limited | Foamed polyolefin-based resin container and process for producing the same |
| EP1120359A1 (en) * | 2000-01-27 | 2001-08-01 | Sumitomo Chemical Company, Limited | Hollow foamed polyolefinic resin container and process for producing the same |
| JP2001260287A (en) * | 2000-03-17 | 2001-09-25 | Dainippon Printing Co Ltd | Foamed wall paper having excellent stain resistance and manufacturing method for the same |
| JP2002331624A (en) * | 2001-03-08 | 2002-11-19 | Jsp Corp | Multilayered polypropylene resin foamed sheet and assembling box therefor |
-
1997
- 1997-07-11 JP JP20246697A patent/JPH1134251A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1116579A1 (en) * | 2000-01-12 | 2001-07-18 | Sumitomo Chemical Company, Limited | Foamed polyolefin-based resin container and process for producing the same |
| EP1120359A1 (en) * | 2000-01-27 | 2001-08-01 | Sumitomo Chemical Company, Limited | Hollow foamed polyolefinic resin container and process for producing the same |
| US6497838B2 (en) | 2000-01-27 | 2002-12-24 | Sumitomo Chemical Company, Limited | Process for producing a hollow foamed polyolefinic resin container |
| US6713139B2 (en) | 2000-01-27 | 2004-03-30 | Sumitomo Chemical Company, Limited | Hollow foamed polyolefinic resin container |
| JP2001260287A (en) * | 2000-03-17 | 2001-09-25 | Dainippon Printing Co Ltd | Foamed wall paper having excellent stain resistance and manufacturing method for the same |
| JP2002331624A (en) * | 2001-03-08 | 2002-11-19 | Jsp Corp | Multilayered polypropylene resin foamed sheet and assembling box therefor |
| JP4610139B2 (en) * | 2001-03-08 | 2011-01-12 | 株式会社ジェイエスピー | Multilayer polypropylene resin foam board and assembly box thereof |
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