JP3945182B2 - Microwave paper cup - Google Patents
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- JP3945182B2 JP3945182B2 JP2001125487A JP2001125487A JP3945182B2 JP 3945182 B2 JP3945182 B2 JP 3945182B2 JP 2001125487 A JP2001125487 A JP 2001125487A JP 2001125487 A JP2001125487 A JP 2001125487A JP 3945182 B2 JP3945182 B2 JP 3945182B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、電子レンジによる加熱調理が可能な紙カップに関する。
【０００２】
【従来の技術】
紙カップは、一般的には、例えば図４、図５に示すように、扇形状の胴紙の一方の端縁をもう一方の端縁に重ね合わせて接合させ、下方に向かって先細る円筒形状の胴部材とする胴部材形成工程（ａ）、別に底部材用ロールからほぼ円形状に打ち抜かれた底紙を外周縁部を下向きに起立させて底部材とする底部材形成工程（ｂ）、胴部材の下部内面に底部材の外周縁部の内面を接合させる接合工程（ｃ）、さらに外周縁部を覆うように前記胴部材の下端縁部を内方に折り曲げ、底部材の外周縁部の外面に接合させて環状脚部（２４）が形成される環状脚部形成工程（ｄ）、最後に胴部材の上部周縁を外方に向けて巻き込み、口縁部（２３）を形成させる口縁部形成工程（ｅ）の各工程を経て、胴部（２１）と底部（２２）を有する紙カップ（２０）を作製している。
【０００３】
そして、この紙カップに液状の内容物を充填して電子レンジにかけて加熱調理を行うと電磁誘導によるカップの底部周辺の端面の焦げが問題となる。
これは電磁波の集中による蓄熱に起因すると推定されている。
【０００４】
また、実験上カップの底部周辺の端面が焦げないようにするためには、環状脚部の高さを３ｍｍ程度以下にしなければならないことが分かっている。
通常の紙カップは環状脚部の高さを４〜１０ｍｍ程度にしているので、通常の紙カップに内容物を入れて電子レンジ加熱調理を行うと紙カップの底部周辺の端面は焦げてしまうことになる。
【０００５】
従来の紙カップ成形法で環状脚部の高さを３ｍｍ以下にして成形することも可能である。しかし、この場合には、環状脚部の有効接着幅は２ｍｍ程度ないしそれ以下になってしまう。このような接着状態では電子レンジによる内容物の高温度化、対流、さらには油分を含む内容物の場合等を考慮すると、この接着幅では電子レンジ加熱することにより内容物に滲み、漏れ等が発生し易い。
【０００６】
【発明が解決しようとする課題】
本発明は、紙カップに、例えば、即席麺に水を加える等して電子レンジで加熱調理を行う際に生じる以上のような問題点を解決するためになされたもので、電子レンジによる加熱調理が可能な紙カップを提供することを課題とする。
【０００７】
【課題を解決するための手段】
本発明の請求項１の発明は、胴部と底部とからなり、開口部周縁が外側にカールした口縁部を有する紙カップであって、胴部と底部の接合部分の周縁は内側にカールした環状カール部が形成されると共に、環状カール部の近傍を除いた底部は平坦で、底部の環状カール部近傍は盆縁状に盛り上がり、環状カール部近傍を除いた底部より高く形成され、環状カール部の下縁と環状カール部近傍を除いた底部との段差を３ｍｍ以下にしたことを特徴とする電子レンジ用紙カップである。
【０００８】
このように、胴部と底部の接合部分の周縁は内側にカールした環状カール部が形成されると共に、環状カール部の近傍を除いた底部は平坦で、底部の環状カール部近傍は盆縁状に盛り上がり、環状カール部近傍を除いた底部より高く形成され、環状カール部の下縁と環状カール部近傍を除いた底部との段差を以下にしているので、電子レンジによる加熱調理を行っても、紙カップの底部の周縁の端面が焦げたりすることがない。
【０００９】
また、胴部と底部の接合部分の周縁は胴部材と底部材を完全に接着した後に内側にカールした環状カール部を形成させているので、胴部と底部は完全に接着され、内容物が漏れたり染みだしたりすることがない。
【００１０】
請求項２の発明は、請求項１の発明において、前記胴部と底部は、カップ原紙の少なくとも内面に、耐熱性ポリオレフィン系樹脂を塗布したポリオレフィン系樹脂加工紙からなることを特徴とする電子レンジ用紙カップである。
【００１１】
このように、紙カップの胴部と底部は、カップ原紙の少なくとも内面に耐熱性ポリオレフィン系樹脂を塗布したポリオレフィン系樹脂加工紙からなるので、好適な成形性を有すると共に、電子レンジ耐性を有する紙カップが成形できる。
【００１２】
【発明の実施の形態】
本発明の電子レンジ用紙カップを一実施形態に基づいて以下に詳細に説明する。
図１は、本発明の電子レンジ用紙カップの一実施例を示す断面図であり、図２は、図１のＡ部の拡大説明図である。
【００１３】
本発明の電子レンジ用紙カップは、胴部（１１）と底部（１２）とからなり、開口部周縁が外側にカールした口縁部（１３）を有する紙カップである。
そして、胴部（１１）と底部（１２）の接合部分の周縁は内側にカールした環状カール部（１４）が形成されている。
【００１４】
また、環状カール部の近傍を除いた底部（１２）は平坦で、底部の環状カール部近傍は盆縁状に盛り上がり、環状カール部近傍を除いた底部より高く形成され、環状カール部の下縁と環状カール部近傍を除いた底部との段差（ｄ）を３ｍｍ以下にした電子レンジ用紙カップ（１０）である。
【００１５】
紙カップに使用する材料は、胴部（１１）を形成する胴部材、底部（１２）を形成する底部材とも、坪量１５０〜３００ｇ／ｍ2 程度のカップ原紙の両面または片面に、ポリエチレン樹脂、ポリプロピレン樹脂などのポリオレフィン系樹脂を１０〜５０μｍ程度塗布したポリオレフィン系樹脂加工紙を用いることが一般的である。
また、底部材の総厚と胴部材の総厚とを同じにしても良いが、底部材の総厚を胴部材の総厚より３割程度減らすことにより、胴部材と底部材との接合部分の成形性が向上する。
【００１６】
口縁部（１３）は、図示はしていないが、上下方向に押しつぶした偏平な口縁部としても良い。
【００１７】
この紙カップの成形は、前述の一般的な紙カップ成形工程において、円筒形状の胴部材の下部内面に、底部材の外周縁部の内面を接合させた接合工程の後に、環状脚部形成工程の代わりに、接合部分を内方に向けて巻き込み環状カール部を作製する脚部巻き込み工程（ｆ）と、環状カール部の近傍を除いた底部を平面状に加工する底部加圧工程（ｇ）を設けることにより成形できる（図３参照）。
【００１８】
このようにして作製した紙カップに内容物を入れて電子レンジで加熱調理しても、環状カール部の下縁と環状カール部近傍を除いた底部との段差（ｄ）が３ｍｍ以下にしてあるので、底部周辺の端面には焦げが生ぜず、内容物のもれや滲みのない紙カップとなる。
【００１９】
【実施例】
以下実施例により本発明をさらに詳細に説明する。
〈実施例１〉
先ず、胴部を形成する胴部材として坪量２７０ｇ／ｍ2 のカップ原紙の内面側に厚さ３０μｍの低密度ポリエチレン樹脂を塗布した総厚みが０．３２ｍｍのポリエチレン加工紙を、また、底部を形成する底部材として坪量２１０ｇ／ｍ2 のカップ原紙の内面側に厚さ２０μｍの低密度ポリエチレン樹脂を塗布した総厚みが０．２３ｍｍのポリエチレン加工紙を、それぞれ準備した。
【００２０】
ついで、一般的な紙カップ成形機を一部改造した紙カップ成形機を用いて、上述の胴部材形成工程、底部材形成工程、接合工程、脚部巻き込み工程、底部加圧工程、口縁部形成工程を経て、ポリエチレンを内側にした、高さ；１０６．９ｍｍ、口径；９４．４ｍｍ、底径；６４．３ｍｍ、環状カール部口径；３．８ｍｍ、環状カール部下縁と環状カール部近傍を除いた底部との段差；２．３ｍｍ、テーパー角度；６．５°の、実施例１の電子レンジ用紙カップを作製した。
【００２１】
〈比較例１〉
実施例１と同じ胴部材、底部材を用いて、従来通りの環状脚部を有する実施例１と同じ寸法の紙カップを一般的な紙カップ成形機を用いて作製し、比較例１の紙カップとした。なお、環状脚部の高さは１０ｍｍである。
【００２２】
こうして作製した実施例１種類、比較例１種類、合計２類の紙カップの電子レンジ適性を下記する方法により評価した。その結果を表１い示す。
電子レンジ適性‥ 試料の紙カップに内容物（水）を充填し、出力１５００ワットの家庭用電子レンジにて４分間（過剰条件）加熱し、脚部のコゲの状態を目視観察し、コゲの発生したものを電子レンジ適性なしとした
○ ‥ 電子レンジ適性あり
× ‥ 電子レンジ適性なし
【００２３】
【表１】
この結果から、環状カール部下縁と環状カール部近傍を除いた底部との段差を３ｍｍ以下にした実施例１の紙カップは、電子レンジで加熱しても底部周辺の端面は焦げることがなく、内容物のもれや滲みもないことが分かった。
【００２５】
【発明の効果】
上記のように、カップ胴部の下縁と底面との段差を３ｍｍ以下にすることにより、電子レンジで加熱しても底部周辺の端面は焦げることがなく、内容物のもれや滲みもない電子レンジ適性を有する紙カップが作製できた。
【図面の簡単な説明】
【図１】本発明の電子レンジ用紙カップの一例を示す、断面説明図である。
【図２】図１のＡ部の拡大説明図である。
【図３】本発明の紙カップの製造工程の一例を示す、模式説明図である。
【図４】従来の紙カップの一例を示す部分断面説明図である。
【図５】従来の紙カップの一般的な製造工程の一例を示す、模式説明図である。
【符号の説明】
１０、２０‥‥紙カップ
１１、２１‥‥胴部
１２、２２‥‥底部
１３、２３‥‥口縁部
１４‥‥環状脚部
２４‥‥環状カール部
ｄ‥‥段差[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper cup that can be cooked by a microwave oven.
[0002]
[Prior art]
As shown in FIGS. 4 and 5, for example, a paper cup generally has a cylindrical shape in which one end of a fan-shaped paperboard is overlapped and joined to the other end, and is tapered downward. A body member forming step (a) as a body member, and a bottom member forming step (b) in which a bottom paper punched into a substantially circular shape from a bottom member roll is erected downward with an outer peripheral edge facing downward, A joining step (c) for joining the inner surface of the outer peripheral edge portion of the bottom member to the lower inner surface of the body member; and further bending the lower end edge of the body member inward so as to cover the outer peripheral edge portion; An annular leg forming step (d) in which an annular leg (24) is formed by being joined to the outer surface of the body, and finally the upper peripheral edge of the body member is wound outward to form the mouth edge (23). Through each step of the edge forming step (e), a paper cup having a trunk portion (21) and a bottom portion (22) ( It is to prepare a 0).
[0003]
And when this paper cup is filled with a liquid content and cooked in a microwave oven, the end face around the bottom of the cup due to electromagnetic induction becomes a problem.
This is estimated to be caused by heat storage due to concentration of electromagnetic waves.
[0004]
In addition, it has been experimentally found that the height of the annular leg must be about 3 mm or less in order to prevent the end surface around the bottom of the cup from burning.
Since the height of the annular leg portion of the normal paper cup is about 4 to 10 mm, the end surface around the bottom portion of the paper cup will be burnt when the contents are put in the normal paper cup and cooked with a microwave oven.
[0005]
It is also possible to form the annular leg portion with a height of 3 mm or less by a conventional paper cup molding method. However, in this case, the effective bonding width of the annular leg portion is about 2 mm or less. In such an adhesive state, considering the high temperature of the contents by the microwave oven, convection, and the case of contents containing oil, etc., the adhesive width causes the contents to bleed, leak, etc. by heating in the microwave oven. It is easy to generate.
[0006]
[Problems to be solved by the invention]
The present invention was made to solve the above-mentioned problems that occur when cooking in a microwave oven by adding water to a paper cup, for example, instant noodles. It is an object to provide a possible paper cup.
[0007]
[Means for Solving the Problems]
The invention of claim 1 of the present invention is a paper cup having a body part and a bottom part, and having a mouth edge whose outer periphery is curled outward, and the peripheral part of the joint part between the body and the bottom is curled inward. An annular curl portion is formed, and the bottom portion except for the vicinity of the annular curl portion is flat, the vicinity of the annular curl portion of the bottom portion rises like a basin edge, and is formed higher than the bottom portion except for the vicinity of the annular curl portion. The microwave oven paper cup is characterized in that a step between the lower edge of the portion and the bottom portion excluding the vicinity of the annular curled portion is 3 mm or less.
[0008]
In this way, the periphery of the joint part between the body part and the bottom part is formed with an annular curled part curled inward, the bottom part except for the vicinity of the annular curled part is flat, and the vicinity of the annular curled part at the bottom part is a bonnet-like shape. It is formed higher than the bottom part except for the vicinity of the annular curl part, and the step between the lower edge of the annular curl part and the bottom part except for the vicinity of the annular curl part is as follows. The end face of the peripheral edge of the bottom of the paper cup will not burn.
[0009]
In addition, since the peripheral edge of the joint portion between the body portion and the bottom portion forms an annular curled portion that is curled inward after the body member and the bottom member are completely bonded together, the body portion and the bottom portion are completely bonded, and the contents are It does not leak or ooze out.
[0010]
The invention according to claim 2 is the microwave oven according to claim 1, wherein the body portion and the bottom portion are made of polyolefin resin processed paper in which a heat-resistant polyolefin resin is applied to at least the inner surface of the cup base paper. It is a paper cup.
[0011]
In this way, the body and bottom of the paper cup are made of polyolefin resin processed paper in which a heat-resistant polyolefin resin is applied to at least the inner surface of the cup base paper, so that a paper cup having suitable moldability and having resistance to microwave ovens can be obtained. Can be molded.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A microwave oven paper cup of the present invention will be described in detail below based on one embodiment.
FIG. 1 is a cross-sectional view showing an embodiment of the microwave oven paper cup of the present invention, and FIG. 2 is an enlarged explanatory view of a portion A in FIG.
[0013]
The microwave oven paper cup of the present invention is a paper cup that includes a body portion (11) and a bottom portion (12), and has a mouth edge portion (13) whose peripheral edge of the opening is curled outward.
An annular curled portion (14) curled inward is formed at the periphery of the joint portion between the body portion (11) and the bottom portion (12).
[0014]
The bottom (12) excluding the vicinity of the annular curl portion is flat, the vicinity of the annular curl portion at the bottom is raised like a basin edge, and is formed higher than the bottom portion except for the vicinity of the annular curl portion. And a microwave oven paper cup (10) having a step (d) of 3 mm or less from the bottom excluding the vicinity of the annular curled portion.
[0015]
The material used for the paper cup is made of a polyethylene resin on both sides or one side of the base paper of the cup having a basis weight of about 150 to 300 g / m 2 , both of the barrel member forming the barrel portion (11) and the bottom member forming the bottom portion (12). It is common to use polyolefin resin processed paper coated with about 10 to 50 μm of polyolefin resin such as polypropylene resin.
The total thickness of the bottom member and the total thickness of the body member may be the same, but the joint portion between the body member and the bottom member is reduced by reducing the total thickness of the bottom member by about 30% from the total thickness of the body member. The moldability of is improved.
[0016]
Although not shown, the mouth edge (13) may be a flat mouth edge crushed in the vertical direction.
[0017]
This paper cup is formed by replacing the annular leg forming step after the joining step in which the inner surface of the outer peripheral edge of the bottom member is joined to the lower inner surface of the cylindrical body member in the aforementioned general paper cup molding process. Are provided with a leg winding step (f) for producing an annular curled portion with the joint portion facing inward, and a bottom pressurizing step (g) for processing the bottom portion excluding the vicinity of the annular curled portion into a flat shape. (See FIG. 3).
[0018]
Even if the contents are put into the paper cup thus prepared and cooked in a microwave oven, the step (d) between the lower edge of the annular curl portion and the bottom except for the vicinity of the annular curl portion is 3 mm or less. The end face around the bottom is not burnt, and the paper cup is free from leaking or bleeding.
[0019]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
<Example 1>
First, as a body member for forming the body part, a polyethylene processed paper having a total thickness of 0.32 mm obtained by applying a low-density polyethylene resin having a thickness of 30 μm to the inner surface side of a cup base paper having a basis weight of 270 g / m 2 , and a bottom part As bottom members to be formed, polyethylene processed paper having a total thickness of 0.23 mm, in which a low-density polyethylene resin having a thickness of 20 μm was applied to the inner surface of a cup base paper having a basis weight of 210 g / m 2 , was prepared.
[0020]
Then, using a paper cup molding machine that is a partial modification of a general paper cup molding machine, the above-mentioned body member forming process, bottom member forming process, joining process, leg winding process, bottom pressurizing process, lip forming process The height is 106.9 mm, the aperture is 94.4 mm, the bottom diameter is 64.3 mm, the annular curl diameter is 3.8 mm, and the lower edge of the annular curl portion and the vicinity of the annular curl portion are excluded. A microwave oven paper cup of Example 1 having a level difference with the bottom of 2.3 mm and a taper angle of 6.5 ° was produced.
[0021]
<Comparative example 1>
Using the same body member and bottom member as in Example 1, a paper cup having the same dimensions as in Example 1 having a conventional annular leg portion was produced using a general paper cup molding machine to obtain a paper cup of Comparative Example 1. . The height of the annular leg is 10 mm.
[0022]
The suitability of the microwave oven for the two types of paper cups prepared in this manner, one type of Example and one type of Comparative Example, was evaluated by the following method. The results are shown in Table 1.
Suitability for microwave oven: Fill sample paper cup with water (water), heat for 4 minutes (excess condition) in home microwave oven with output of 1500 watts, visually check the state of kogation on leg, and generate kogation ○ · · · · · Microwave oven suitability × · · · Microwave oven suitability [0023]
[Table 1]
From this result, the paper cup of Example 1 in which the level difference between the lower edge of the annular curl portion and the bottom except for the vicinity of the annular curl portion is 3 mm or less does not burn the end surface around the bottom even when heated with a microwave oven. I found that there was no leakage or bleeding.
[0025]
【The invention's effect】
As described above, by making the step between the lower edge and the bottom surface of the cup body portion 3 mm or less, the end surface around the bottom portion is not burnt even when heated by a microwave oven, and there is no leakage or bleeding of the contents. A paper cup having suitability for a microwave oven could be produced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing an example of a microwave oven paper cup of the present invention.
FIG. 2 is an enlarged explanatory view of a part A in FIG.
FIG. 3 is a schematic explanatory view showing an example of the manufacturing process of the paper cup of the present invention.
FIG. 4 is a partial cross-sectional explanatory view showing an example of a conventional paper cup.
FIG. 5 is a schematic explanatory view showing an example of a general manufacturing process of a conventional paper cup.
[Explanation of symbols]
10, 20 ...
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001125487A JP3945182B2 (en) | 2001-04-24 | 2001-04-24 | Microwave paper cup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001125487A JP3945182B2 (en) | 2001-04-24 | 2001-04-24 | Microwave paper cup |
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| Publication Number | Publication Date |
|---|---|
| JP2002315672A JP2002315672A (en) | 2002-10-29 |
| JP3945182B2 true JP3945182B2 (en) | 2007-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001125487A Expired - Fee Related JP3945182B2 (en) | 2001-04-24 | 2001-04-24 | Microwave paper cup |
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| JP (1) | JP3945182B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4849499B2 (en) * | 2001-09-21 | 2012-01-11 | 東罐興業株式会社 | Microwave oven heated paper container and manufacturing method thereof |
| JP6056311B2 (en) * | 2012-09-20 | 2017-01-11 | 凸版印刷株式会社 | Cup type paper container and method for manufacturing the same |
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2001
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