JPH0545463Y2 - - Google Patents
Info
- Publication number
- JPH0545463Y2 JPH0545463Y2 JP1985159573U JP15957385U JPH0545463Y2 JP H0545463 Y2 JPH0545463 Y2 JP H0545463Y2 JP 1985159573 U JP1985159573 U JP 1985159573U JP 15957385 U JP15957385 U JP 15957385U JP H0545463 Y2 JPH0545463 Y2 JP H0545463Y2
- Authority
- JP
- Japan
- Prior art keywords
- container
- polypropylene resin
- molded
- temperature
- foaming
- 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
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- -1 Polypropylene Polymers 0.000 claims description 17
- 239000004743 Polypropylene Substances 0.000 claims description 17
- 229920001155 polypropylene Polymers 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 6
- 239000002666 chemical blowing agent Substances 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 11
- 238000005187 foaming Methods 0.000 description 9
- 238000009413 insulation Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000004794 expanded polystyrene Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、ポリプロピレン樹脂材料を使用して
成形された発泡容器に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a foam container molded using a polypropylene resin material.
従来から、加熱調理した食品を収納する簡易な
容器として断熱効果の高い発泡スチロール樹脂容
器が多く使用されている。
BACKGROUND ART Conventionally, styrofoam resin containers with high heat insulation effects have been widely used as simple containers for storing cooked foods.
この発泡スチロール樹脂容器は、その断熱効果
が高いこと、成形が容易で安価であると、そして
軽量であること等の利点を持つている。 This expanded polystyrene resin container has advantages such as a high heat insulating effect, easy molding, low cost, and light weight.
しかしながら、上記した従来の発泡スチロール
樹脂製の発泡容器は、断熱性が不充分であるため
に、例えば食品を収納したまま電子レンジ等で加
熱調理することができず、このため電子レンジ調
理用の容器としては使用することができないもの
となつていた。
However, the above-mentioned conventional foam containers made of expanded polystyrene resin have insufficient insulation properties, making it impossible to cook food in a microwave oven, etc. It had become unusable.
また、容器としての機械的強度も決して充分で
はなく、取扱中に破損する事故が数多く発生する
不都合があつた。 In addition, the mechanical strength of the container was not sufficient, resulting in many accidents resulting in breakage during handling.
本考案は、上記した従来例における問題点およ
び不都合を解消すべく考案されたもので、発泡容
器に充分な機械的強度と、高い耐熱性を与えるこ
とを目的としたものである。 The present invention was devised to solve the problems and inconveniences of the conventional examples described above, and aims to provide foam containers with sufficient mechanical strength and high heat resistance.
以下、本考案による低発泡容器１を、本考案の
一実施例に示す図面を参照しながら説明する。
Hereinafter, the low foaming container 1 according to the present invention will be explained with reference to the drawings showing an embodiment of the present invention.
本考案による低発泡容器１は、１〜８％重量比
で化学発泡剤を添加したMFI値が10以上である
ポリプロピレン樹脂を1.1〜2.0の発泡倍率で発泡
させて成形されたシート体２により適当な成形手
段で成形されたものである。 The low-foaming container 1 according to the present invention is suitably made of a sheet body 2 formed by foaming a polypropylene resin with an MFI value of 10 or more to which a chemical foaming agent is added at a weight ratio of 1 to 8% at an expansion ratio of 1.1 to 2.0. It is molded using suitable molding means.
容器１を成形するポリプロピレン樹脂材料は、
通常のシート成形に使用されるMFI値が５以下
のポリプロピレン樹脂材料とは異なつていて、そ
のMFI値が10以上のものが使用されるが、これ
は容器として発泡状態が美麗でしかも均一になる
からである。 The polypropylene resin material used to form the container 1 is
This is different from the polypropylene resin material used for normal sheet molding, which has an MFI value of 5 or less, and has an MFI value of 10 or more. Because it will be.
発泡倍率を1.1〜2.0としたのは、発泡倍率が大
きければ大きい程高い断熱効果を得ることができ
るが、反対にバリヤー性が低下すると云う現象が
あるため、実用上充分な断熱性を得ると共に、内
容物の収納保持に支障の生じない程度のバリヤー
性を発揮することのできるからである。 The reason for setting the foaming ratio to 1.1 to 2.0 is that the higher the foaming ratio, the higher the insulation effect can be obtained, but on the other hand, there is a phenomenon that the barrier properties decrease. This is because it can exhibit barrier properties to the extent that it does not impede the storage and retention of contents.
すなわち、発泡倍率が1.1以下であると、通常
のポリプロピレン樹脂性の容器とはほぼ同等のバ
リヤー性を得ることができるのであるが、断熱効
果は大幅に低下することになり、反対に発泡倍率
を2.0以上にすると、極めて高い断熱効果を発揮
することになるのであるが、バリヤー性が大幅に
低下して、内容物をその品質を劣化させないで収
納保持しなければならない容器としてその保持能
力に不満が生じるからである。 In other words, if the expansion ratio is 1.1 or less, it is possible to obtain almost the same barrier properties as a regular polypropylene resin container, but the insulation effect will be significantly reduced, and on the contrary, if the expansion ratio is If the value is 2.0 or higher, it will exhibit extremely high insulation effects, but the barrier properties will be significantly reduced, making it unsatisfactory as a container that must hold the contents without deteriorating their quality. This is because
また、化学発泡剤（例えば、マスターバツチ）
の添加量を１〜８重量％に設定したのは、この化
学発泡剤の添加量が１重量％以下であると均一で
良好な発泡状態を得ることができず、反対に化学
発泡剤の添加量が８重量％以上であると、シート
体２に成形した際に、平滑な表面を得ることがで
きなくなつてしまうからであり、この化学発泡剤
のポリプロピレン樹脂材料内への望ましい添加量
は２〜４重量％である。 Also, chemical blowing agents (e.g. masterbatch)
The reason for setting the amount of addition of this chemical blowing agent at 1 to 8% by weight is because if the amount of addition of this chemical blowing agent is less than 1% by weight, it will not be possible to obtain a uniform and good foaming state. If the amount is 8% by weight or more, it will be impossible to obtain a smooth surface when molded into the sheet body 2, and the desirable amount of this chemical blowing agent to be added to the polypropylene resin material is as follows: It is 2 to 4% by weight.
成形されたポリプロピレン樹脂製の発泡シート
体２を容器１に成形する手段としては、従来から
利用されているシート成形方法、例えば圧空成形
方法とかバキユーム成形方法とかの成形方法があ
り、その何れの方法を採用しても良い。 As means for molding the molded foamed sheet body 2 made of polypropylene resin into the container 1, there are conventional sheet molding methods such as a pressure molding method and a vacuum molding method, and any of these methods can be used. may be adopted.
本考案による容器１は、上記のごとく、その壁
構造が発泡構造となつているので、壁内に多数存
在する細かな気泡により充分な断熱効果を発揮す
ることになり、これによつて断熱作用の高い容器
となつていると共に、この壁内の発泡気泡の大き
さが充分に制限されているので、壁のバリヤー性
を大幅に低下させることがなく、もつて実用に供
し得るバリヤー性を発揮するものとなつている。
As mentioned above, the container 1 according to the present invention has a foamed wall structure, so the large number of fine air bubbles present in the wall exhibits a sufficient heat insulating effect. In addition to being a highly durable container, the size of the foamed cells within this wall is sufficiently limited, so the barrier properties of the wall are not significantly reduced, and the barrier properties can be used for practical purposes. It has become something to do.
また、ポリプロピレン樹脂を成形主材料として
いると共に、MFI値が10以上であり、さらに化
学発泡剤の発泡倍率を1.1〜2.0に制限しているの
で、発泡することによる機械的な強度の低下が小
さくなり、これによつて機械的強度の充分大きい
発泡容器となつている。 In addition, polypropylene resin is used as the main molding material, the MFI value is 10 or more, and the expansion ratio of the chemical foaming agent is limited to 1.1 to 2.0, so there is little decrease in mechanical strength due to foaming. This results in a foamed container with sufficiently high mechanical strength.
さらに、ベース樹脂がポリプロピレン樹脂であ
るので、充分高い耐熱性を発揮するものとなつて
いると共に、発泡によつて必然的に白濁するので
特別な処置を施さなくても充分な遮光機能を有す
る容器となつている。 Furthermore, since the base resin is polypropylene resin, it exhibits sufficiently high heat resistance, and since it inevitably becomes cloudy due to foaming, the container has a sufficient light-shielding function without any special treatment. It is becoming.
第１図は、容器１をドンブリ状に成形した場合
を示したもので、この容器１を例えば圧空成形方
法により成形する場合は、第２図に示すごとく、
押し出し発泡成形されたシート体２を圧空成形に
適した温度に加熱した状態で金型３上面に押さえ
具４により不動にかつ密に固定し、この状態でシ
ート体２に対して圧空Ａを押さえ具４側から金型
３側へと作用させ、シート体２を容器１に成形す
る。
FIG. 1 shows a case in which the container 1 is molded into a donburi shape. When the container 1 is molded, for example, by a pressure forming method, as shown in FIG.
The extrusion-foamed sheet body 2 is heated to a temperature suitable for air pressure forming, and fixed immovably and tightly to the upper surface of the mold 3 with a presser 4, and in this state pressurized air A is pressed against the sheet body 2. The sheet body 2 is formed into the container 1 by acting from the tool 4 side to the mold 3 side.
シート体２の容器１への圧空成形が完了したな
らば、押さえ具４により一体的に組付けられたカ
ツター５を下降させ、金型３と押さえ具４との間
で挟持されていたシート体２部分を成形された容
器１から切断除去し、金型３内から成形された容
器１を取り出すのである。 When the air pressure forming of the sheet body 2 into the container 1 is completed, the cutter 5 assembled integrally with the presser 4 is lowered, and the sheet body held between the mold 3 and the presser 4 is removed. The two parts are cut and removed from the molded container 1, and the molded container 1 is taken out from the mold 3.
次に、本考案による容器１と普通のポリプロピ
レン樹脂製容器との断熱作用の比較実験例を記載
する。 Next, a comparative experimental example of the heat insulating effect between the container 1 according to the present invention and an ordinary polypropylene resin container will be described.
容器を口径84、高さ70mmのカツプ状に成形
し、この容器内に熱湯を入れた状態での熱湯中心
部の温度と容器の周壁外側面の温度とを測定した
ところ、発泡倍率1.14の容器１の場合、湯中心温
度95.3℃、壁外側温度88.6℃であり、発泡倍率
1.31の容器１の場合、湯中心温度95.6℃、壁外側
温度84.8℃であり、そして発泡倍率1.62の容器１
の場合、湯中心温度95.2℃、壁外側温度81.0℃で
あつた。 A container was molded into a cup shape with a diameter of 84 mm and a height of 70 mm, and when hot water was poured into the container, the temperature at the center of the hot water and the temperature at the outer surface of the peripheral wall of the container were measured, and it was found that the container had an expansion ratio of 1.14. In the case of 1, the temperature at the center of the hot water is 95.3℃, the temperature outside the wall is 88.6℃, and the foaming ratio is
In the case of container 1 of 1.31, the temperature at the center of the hot water is 95.6℃, the temperature outside the wall is 84.8℃, and the expansion ratio of container 1 is 1.62.
In this case, the temperature at the center of the hot water was 95.2℃, and the temperature outside the wall was 81.0℃.
この本考案容器１に対して従来のポリプロピレ
ン樹脂製の容器は、湯中心温度が95℃、壁外側温
度が91.4℃であつた。 In contrast to the container 1 of the present invention, the conventional polypropylene resin container had a hot water center temperature of 95°C and a wall outside temperature of 91.4°C.
このことから、従来のポリプロピレン樹脂製容
器に比べて本考案による容器１は３〜11℃も断熱
効果が高いことが明らかとなつた。 From this, it has become clear that the container 1 according to the present invention has a higher heat insulation effect by 3 to 11 degrees Celsius than the conventional polypropylene resin container.
また、口径120、高さ55mmのドンブリ状に容
器１を成形し、この容器１内に水を満たして電子
レンジ内に置き、電子レンジを４分間作動させた
ところ、同じドンブリ形状に成形されたポリプロ
ピレン樹脂製の従来の容器の壁外側温度が92.9℃
であつたのに対し、本考案容器１の壁外側温度は
79.7℃となり、従来容器に比べて約13℃も高い断
熱効果を発揮することが証明された。 In addition, a container 1 was formed into a donburi shape with a diameter of 120mm and a height of 55mm, and when the container 1 was filled with water and placed in a microwave oven and the microwave was operated for 4 minutes, it was molded into the same donburi shape. The temperature outside the wall of a conventional container made of polypropylene resin is 92.9℃
On the other hand, the temperature outside the wall of the container 1 of the present invention was
The temperature was 79.7℃, proving that the container has a thermal insulation effect that is approximately 13℃ higher than that of conventional containers.
以上の説明から明らかなごとく、本考案による
容器は、従来のポリプロピレン樹脂製容器と比べ
て、同じ耐熱性を持つと共にほぼ同等の機械的強
度を持つことができるにもかかわらず、はるかに
優れた断熱性を発揮することができるので、発泡
容器であるのもかかわらず電子レンジを利用して
調理を行う容器として使用することができ、また
発泡容器であるので壁厚の大きさの割には使用さ
れるポリプロピレン樹脂材料の量を少なくするこ
とができ、そして特別な顔料を添加することなし
に充分な遮光性を得ることができ、さらに従来か
らの既設の装置をそのまま多用して成形すること
ができる等多くの優れた効果を発揮するものであ
る。
As is clear from the above explanation, the container according to the present invention has the same heat resistance and almost the same mechanical strength as the conventional polypropylene resin container, but it is far superior to the conventional polypropylene resin container. Because it can exhibit insulation properties, it can be used as a container for cooking in a microwave oven even though it is a foam container. The amount of polypropylene resin material used can be reduced, sufficient light-shielding properties can be obtained without adding special pigments, and the molding can be performed using existing conventional equipment as is. It has many excellent effects such as the ability to
第１図は、本考案による容器の一実施例を示す
全体斜視図である。第２図は、第１図に示した容
器の成形方法の一例を説明するための縦断面図で
ある。
符号の説明、１……容器、２……シート体、３
……金型、４……押さえ具、５……カツター、Ａ
……圧空。
FIG. 1 is an overall perspective view showing an embodiment of a container according to the present invention. FIG. 2 is a longitudinal sectional view for explaining an example of a method of forming the container shown in FIG. 1. Explanation of symbols, 1... Container, 2... Sheet body, 3
...mold, 4...presser, 5...cutter, A
...Pressure air.
Claims (1)
値が10以上であるポリプロピレン樹脂を1.1〜2.0
の発泡倍率で発泡させて成形されたシート体製の
低発泡容器。 MFI with chemical blowing agent added at 1-8% weight ratio
Polypropylene resin with a value of 10 or more from 1.1 to 2.0
A low-foam container made of sheet material that is foamed and molded at an expansion ratio of .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985159573U JPH0545463Y2 (en) | 1985-10-18 | 1985-10-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985159573U JPH0545463Y2 (en) | 1985-10-18 | 1985-10-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6267726U JPS6267726U (en) | 1987-04-27 |
| JPH0545463Y2 true JPH0545463Y2 (en) | 1993-11-19 |
Family
ID=31084128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985159573U Expired - Lifetime JPH0545463Y2 (en) | 1985-10-18 | 1985-10-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0545463Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2622556B2 (en) * | 1987-09-30 | 1997-06-18 | 株式会社吉野工業所 | Food containers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830142A (en) * | 1971-08-20 | 1973-04-20 |
-
1985
- 1985-10-18 JP JP1985159573U patent/JPH0545463Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830142A (en) * | 1971-08-20 | 1973-04-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6267726U (en) | 1987-04-27 |
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