JP4666925B2 - Paper molding container - Google Patents

Paper molding container Download PDF

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JP4666925B2
JP4666925B2 JP2004033383A JP2004033383A JP4666925B2 JP 4666925 B2 JP4666925 B2 JP 4666925B2 JP 2004033383 A JP2004033383 A JP 2004033383A JP 2004033383 A JP2004033383 A JP 2004033383A JP 4666925 B2 JP4666925 B2 JP 4666925B2
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container
paper
peripheral surface
molded
synthetic resin
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JP2005225498A (en
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耕一 石塚
敬吾 黒野
和洋 渡部
誠司 岡部
淳 渡邉
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Tokan Kogyo Co Ltd
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Description

本発明は、紙を主材とする容器成形材を絞り成形した紙製成形容器及びその製造方法に関する。   The present invention relates to a paper-molded container formed by drawing a container-molded material mainly composed of paper and a method for producing the same.

従来、紙製容器において耐水性や耐油性、或いはガスバリヤー性等を高めるために、紙に合成樹脂フィルムをラミネート或いは合成樹脂をコーティングしたもの、又は合成樹脂を含浸させた紙を主材にした成形容器（以下、単に紙製成形容器という）が使用されてきている。従来の紙製成形容器は、平板状の容器成形材（ブランク）を絞り成形によって成形しているが、主材である紙は合成樹脂や金属と違って展性が殆どないため、縮径量に相当する分を胴壁にひだ状に折り込み（プリーツ）を形成しないと絞り成形できない。そのため、折り込まれたひだの形状を成形後も維持するためにひだを接着剤で接着させるとか、ラミネートした合成樹脂を溶融させて接着させるなどの手段を施している（例えば、特許文献１〜３参照）。しかしながら、このように絞り成形された容器は、胴壁の折り込み部が目立つ不具合があるとともに深絞りが困難であるため、トレー状や浅カップ状のもっぱら底の浅い成形容器にしか実用化されてないのが現状である。
特開平９−５６３１９号公報 特許第２８７５４９６号 特開２００１−１８０６４５号公報 Conventionally, in order to improve the water resistance, oil resistance, gas barrier property, etc. in paper containers, the main material is a paper laminated with a synthetic resin film or coated with a synthetic resin, or a paper impregnated with a synthetic resin. Molded containers (hereinafter simply referred to as paper molded containers) have been used. Conventional paper-molded containers are formed by drawing a flat plate-shaped container molding material (blank), but the main material, paper, has little malleability unlike synthetic resin or metal, so the diameter reduction amount If the part corresponding to is folded into pleats (pleats) on the body wall, it cannot be drawn. Therefore, in order to maintain the shape of the folded pleats after molding, means such as adhering the pleats with an adhesive or melting and adhering the laminated synthetic resin are applied (for example, Patent Documents 1 to 3). reference). However, since the container formed in this way has a problem that the folding part of the body wall is conspicuous and it is difficult to deeply draw it, it has been put into practical use only in a tray-shaped or shallow cup-shaped shallow molded container. There is no current situation.
JP-A-9-56319 Japanese Patent No. 2875496 JP 2001-180645 A

上記のような問題点を解決するために本出願人は、従来の絞り成形法に代わる紙製成形容器の新しい成形方法としてしごき絞り成形法を開発し、それによって従来のひだ状の折りこみ部の発生と比べて特段に小さいしわが胴壁に生じるだけで成形でき、且つ従来と比べて底深の容器の成形が可能な成形方法を提案した（特願２００２−３２０４６７号）。
このしごき絞り成形法によって成形した紙製成形容器は、図５（ａ）（ｂ）に示すように胴壁３０に生じる微細なしわがかえって独特な風合いを醸し出し美麗に成形できる点で満足するものであったが、図５（ｂ）にその断面を顕微鏡写真で示すように胴壁３０の内外面に微細な線状の縦しわ３１が極微細な溝となっているため、液状あるいは液体を含む内容物３５である場合、同図（ｃ）に符号３４で模式的に示すように毛細管現象で内容液が胴壁を伝って時間が経過すると共に容器開口端のカール部（蓋材シール位置）３２まで達するという問題点が生じた。
そこで、本発明は、このようなしごき絞り成形法によって成形され胴壁内周面に微細なしわを有する紙製成形容器における微細しわに起因する毛細管現象による内容液の蓋材シール位置への上昇を完全に阻止することができ、液状内容物でも確実に充填シールでき、且つ容器胴壁に折り込みひだを有せず美麗に成形でき、安価に製造できる紙製成形容器及びその製造方法を提供することを目的とする。 In order to solve the above-mentioned problems, the present applicant has developed a squeezing drawing method as a new method for forming a paper-molded container in place of the conventional drawing method, and thereby a conventional fold-like folded portion. A molding method has been proposed that can be molded simply by generating a wrinkle that is particularly small in the body wall as compared with the occurrence of the above, and that can form a container having a deeper bottom than the conventional one (Japanese Patent Application No. 2002-320467).
The paper-made container formed by this ironing drawing method is satisfactory in that the fine wrinkles generated on the barrel wall 30 can be changed to create a unique texture as shown in FIGS. 5 (a) and 5 (b). However, as shown in a micrograph of the cross section in FIG. 5 (b), fine linear vertical wrinkles 31 are formed on the inner and outer surfaces of the body wall 30 as extremely fine grooves, so that liquid or liquid is contained. In the case of the contents 35, the curled portion (the lid seal position) at the container opening end as time elapses as the content liquid travels through the body wall by capillary action as schematically indicated by reference numeral 34 in FIG. The problem of reaching 32 occurred.
Therefore, the present invention is to raise the content liquid to the lid seal position by capillarity caused by fine wrinkles in a paper molded container formed by such ironing drawing method and having fine wrinkles on the inner peripheral surface of the body wall. Provided is a paper molded container that can completely prevent liquid, can be reliably filled and sealed even with liquid contents, can be molded beautifully without folds on the container body wall, and can be manufactured at low cost, and a method for manufacturing the same. For the purpose.

本発明者らは、上記問題点を解決するために種々研究する過程で、微細しわによる毛細管現象を発現させない方法として、内容物に混ざっても人体に影響を及ぼさない例えばパーム油やバター等融点の低い物質を目止め剤として容器内周面に塗工して、しわの凹部を埋めることにより、毛細管現象の発生を防止できることを着想し実験した。しかしながら、この方法は、内容物が加熱を要しない場合は良好であるが、内容物を容器ごと電子レンジ等で加熱する場合、目止め剤が溶け出してしまうため、目止め効果がなくなり、毛細管現象の発生を完全に阻止することはできず、また内容物のフレバーにも影響を及ぼすため、加熱する内容物を充填する容器としては満足する結果が得られなかった。そして、さらに研究を重ねた結果、紙を主材とする容器成形材自体に含まれている樹脂を利用してしわの目止めをすることを着想し、本発明に到達したものである。   In the course of various studies to solve the above problems, the present inventors do not exert a capillary phenomenon due to fine wrinkles, and do not affect the human body even if mixed with the contents, such as palm oil and butter melting point An experiment was carried out with the idea that the occurrence of capillarity can be prevented by applying a low-concentration substance as a sealant to the inner peripheral surface of the container and filling the concave portion of the wrinkle. However, this method is good when the contents do not need to be heated, but when the contents are heated together with the container in a microwave oven or the like, the sealing agent dissolves, so that the sealing effect is lost, and the capillary tube The occurrence of the phenomenon could not be completely prevented, and the flavor of the contents was also affected, so that satisfactory results were not obtained as a container filled with the contents to be heated. As a result of further research, the inventors have arrived at the present invention with the idea of using a resin contained in a container molding material itself mainly made of paper to prevent wrinkles.

即ち、本発明の紙製成形容器は、紙を主材とし表面に合成樹脂層または合成樹脂含浸層を有する容器成形材を絞り成形してなる紙製成形容器であって、前記容器成形材をしごき絞り加工により成形して胴壁の内周面及び外周面に微細な線状のしわが形成された紙製成形容器の胴壁の内周面に、前記線状の微細なしわの窪みが前記容器成形材から溶融した合成樹脂により埋めて目止される熱プレス処理部が形成されてなり、内容物の液汁が毛細管現象による容器開口端へ上昇することを阻止するようにしてなることを特徴とするものである。前記胴壁の微細なしわの合成樹脂による目止めは、胴壁内周面全体に行なってもよいが、少なくとも該容器に充填される内容物の液面上方位置から所定高さ範囲を含むリング状範囲を熱プレス処理することが望ましい。前記微細なしわは、胴壁内方に向かう開口幅が０．５ｍｍ以下の微細な線状窪みである。 That is, the paper molded container of the present invention is a paper molded container formed by drawing a container molded material having paper as a main material and having a synthetic resin layer or a synthetic resin impregnated layer on the surface, the container molded material being the inner peripheral surface of the ironing drawing by molding to the barrel wall of the inner and outer peripheral surfaces to a fine linear wrinkles formed cylinder wall paper molded container, the depression of the linear fine wrinkles fill the molten synthetic resin from the container forming material becomes formed heat pressing portion Ru locked eyes, that juice of contents is so as to prevent the rise into the container open end by capillary action It is a feature. The fine wrinkles of the barrel wall may be sealed with the synthetic resin on the entire inner peripheral surface of the barrel wall, but at least a ring including a predetermined height range from the position above the liquid level of the contents filled in the container. It is desirable to hot press the range. The fine wrinkle is a fine linear depression having an opening width of 0.5 mm or less toward the inside of the body wall.

本発明の上記紙製成形容器の製造方法は、紙を主材とし表面に合成樹脂層または合成樹脂含浸層を有する容器成形材を絞り成形してなる紙製成形容器の製造方法であって、前記容器成形材をしごき絞り加工により成形して胴壁の内周面及び外周面にほぼ縦方向に微細な線状のしわを発生させて紙製成形容器を成形し、且つ該紙製成形容器の前記胴壁の内周面を１００〜２００℃に加熱し、面圧５〜５０Ｋｇ／ｃｍ２で加圧することにより、前記容器成形材の合成樹脂を溶融させ、該溶融した合成樹脂で胴壁内周面の前記線状の微細なしわの窪みを目止めして熱プレス処理部を形成することを特徴とするものである。
前記加熱は成形容器内周面に加熱した熱板を押圧することにより行なうか容器内部にホットエアを吹きつけることにより行なうか何れの方法も採用可能である。 Method for producing the paper made molded container of the present invention is a method for producing a paper molded container obtained by draw forming the container forming material having a synthetic resin layer and synthetic resin impregnated layer to the surface of the paper as the main material, The container molding material is molded by squeezing and drawing to form fine linear wrinkles on the inner peripheral surface and outer peripheral surface of the barrel wall in a substantially vertical direction to form a paper molded container, and the paper molded container The inner peripheral surface of the body wall is heated to 100 to 200 ° C. and pressurized at a surface pressure of 5 to 50 kg / cm 2 to melt the synthetic resin of the container molding material. It is characterized in that the hot press processing part is formed by keeping an eye on the depressions of the linear fine wrinkles on the inner peripheral surface.
Either the heating can be performed by pressing a heated plate on the inner peripheral surface of the molded container or by blowing hot air into the container.

本発明の紙製成形容器は、従来のひだ状の折りこみ部と比べて特段に小さいしわが胴壁に発生するだけで成形でき、且つ従来と比べて底深の容器の成形が可能であって、微細しわに起因する胴壁内周面の液面から容器上端のシール部に至る毛細管現象発生経路が、熱プレス処理によって遮断されているので、微細しわがあっても毛細管現象による内容液の蓋材シール位置への上昇を完全に阻止することができ、液状内容物でも確実に密封することができる。そして、本発明の紙製成形容器製造方法は、容器胴壁に折り込みひだを有せず美麗に成形でき、且つ特別な目止め材を必要とすることなく確実に微細しわを目止めすることができ、液状内容物でも確実に密封保護でき、且つ内容物を充填したまま電子レンジで加熱可能であり、従来の紙製成形容器と比べて多用途に利用可能な紙製成形容器を安価に提供することができる。   The paper molded container according to the present invention can be formed simply by generating particularly small wrinkles on the body wall as compared with the conventional fold-like folded part, and can form a container having a deeper bottom than the conventional one. Since the capillary action generation path from the liquid level on the inner peripheral surface of the body wall due to fine wrinkles to the seal at the upper end of the container is blocked by heat press processing, the content liquid due to capillary action even if there are fine wrinkles Can be completely prevented from rising to the lid seal position, and even liquid contents can be reliably sealed. The paper molded container manufacturing method of the present invention can be molded beautifully without folding folds on the container body wall, and can reliably detect fine wrinkles without the need for a special sealing material. It is possible to reliably seal even liquid contents, and it can be heated in a microwave oven while filling the contents, providing a paper molding container that can be used for many purposes at a lower cost than conventional paper molding containers. can do.

以下、本発明の紙製成形容器及びその製造方法の実施形態について、図面を基に詳細に説明する。
図１（ａ）は本発明の実施形態に係る紙製成形容器の正面部分断面図であり、（ｂ）はそのＡ−Ａ断面を顕微鏡で撮影した断面写真における内外面の状態を模写した胴壁断面拡大図である。
本発明の紙製成形容器１は、紙を主材とし表面に合成樹脂層または合成樹脂含浸層を有する一枚の容器成形材から、本出願人が特願２００２−３２０４６７号で提案したしごき絞り方法で製造した紙製成形容器１の胴壁２の内周面を熱プレスしてコーティング又はラミネートされている樹脂を溶融させ、該溶融樹脂で微細しわの凹部を埋めることにより、毛細管現象の発現を阻止したものである。本実施形態では図１（ａ）でハッチングして示すように、胴壁内周面の任意の幅に亘ってリング状に熱プレスして微細なしわを溶融合成樹脂で目止めした熱プレス処理部３を形成して、該熱プレス処理部によって内容液が毛細管現象によって容器の開口端部４まで上昇することを阻止している。該熱プレス処理部３は側壁内周面全体に施しても良いし、図示のように側壁内周面の一部にリング状に施しても良いが、例えば仮想線で示すように内容物の液面位置５を含むその上下所定幅に設けてもよい。しかしながら、液面を位置を含む必要はないが、少なくとも液面から離れた上方には所定幅設ける必要があり、開口近傍まで幅広く設けるのが望ましい。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a paper molded container and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.
FIG. 1A is a front partial cross-sectional view of a paper molded container according to an embodiment of the present invention, and FIG. 1B is a body that replicates the state of the inner and outer surfaces in a cross-sectional photograph taken with a microscope of the AA cross section. FIG.
The paper molding container 1 of the present invention is a squeezing squeezing proposed by the present applicant in Japanese Patent Application No. 2002-320467 from a single container molding material having a paper as a main material and a synthetic resin layer or a synthetic resin impregnated layer on the surface. The inner peripheral surface of the body wall 2 of the paper molded container 1 manufactured by the method is hot-pressed to melt the resin coated or laminated, and the fine wrinkle recesses are filled with the molten resin, thereby causing the capillary phenomenon. It is a thing that prevented. In this embodiment, as shown by hatching in FIG. 1 (a), a hot pressing process in which fine wrinkles are made of molten synthetic resin by hot pressing in a ring shape over an arbitrary width of the inner peripheral surface of the body wall. The portion 3 is formed, and the hot press treatment portion prevents the content liquid from rising up to the opening end 4 of the container by capillary action. The hot press processing unit 3 may be applied to the entire inner peripheral surface of the side wall, or may be applied to a part of the inner peripheral surface of the side wall in a ring shape as shown in the figure. You may provide in the up-and-down predetermined width including the liquid level position 5. FIG. However, it is not necessary to include the position of the liquid level, but it is necessary to provide a predetermined width at least above the liquid level, and it is desirable to provide a wide range up to the vicinity of the opening.

熱プレス処理された胴壁内周面６は、その断面を図１（ｂ）に拡大して示すように、しわが溶融樹脂で埋まり、均一な滑らかな面となっている。一方、胴壁外周面７には依然として微細しわ８が観察されている。このように、胴壁内周面に熱プレス処理部３を設けることによって、容器側壁に発生している微細しわによる毛細管現象による内容液の上昇を阻止することができ、内容液が容器開口端に達してシール不良を生じることなく、良好に蓋材をシールすることができる。また、微細しわに目止めに使用される合成樹脂の融点以下の加熱では前記目止め効果は失われないので、本発明の成形容器は、１００℃以下程度の温度で容器ごと内容物を電子レンジで加熱しても、目止め効果が損なわれることがないので、電子レンジで加熱可能な容器としても使用可能である。   As shown in FIG. 1B, the inner circumferential surface 6 of the body wall that has been subjected to the hot press process has a uniform smooth surface with wrinkles buried in the molten resin. On the other hand, fine wrinkles 8 are still observed on the outer peripheral surface 7 of the trunk wall. Thus, by providing the hot press processing unit 3 on the inner peripheral surface of the body wall, it is possible to prevent the rise of the content liquid due to the capillary phenomenon due to the fine wrinkles generated on the side wall of the container, and the content liquid is prevented from opening at the container opening end. Thus, the lid material can be satisfactorily sealed without causing a sealing failure. In addition, since the sealing effect is not lost by heating below the melting point of the synthetic resin used for sealing fine wrinkles, the molded container of the present invention is a microwave oven for the contents of each container at a temperature of about 100 ° C. or less. Since the sealing effect is not spoiled even if it is heated at, it can be used as a container that can be heated in a microwave oven.

図２は本実施形態に係る上記紙製成形容器の側壁内周面を熱プレスする熱プレス装置の実施形態概略を示している。
本実施形態の熱プレス装置１５は、雌型１６と加熱・加圧手段である雄型１７とから構成されている。雌型１６は、容器の形状に合せた凹部１８を有し、本実施形態では凹部の側壁内周面がテーパー面となっており、該凹部に嵌合される成形容器１を受けるようになっている。 FIG. 2 shows an outline of an embodiment of a hot press apparatus for hot pressing the inner peripheral surface of the side wall of the paper molded container according to this embodiment.
The hot press device 15 of the present embodiment is composed of a female die 16 and a male die 17 as heating / pressurizing means. The female mold 16 has a concave portion 18 that matches the shape of the container. In this embodiment, the inner peripheral surface of the side wall of the concave portion is a tapered surface, and receives the molded container 1 fitted in the concave portion. ing.

一方、雄型１７は、適宜の駆動手段で上下駆動するロッド１９の下端に交換可能に取り付けられ、雌型凹部の形状と同様に外周面がテーパー状になっており、容器に形成する熱プレス処理部の高さに相当する熱プレス面２０を有し、該雄型が下降することによって、該熱プレス面２０が容器の側壁内周面を所定の圧力で加圧するようになっている。雄型１７は、ヒータ２１を有して、所定温度に加熱可能に構成され、稼働中常時所定温度に加熱されている。上記加熱温度は、容器側壁にラミネート、コーティング又は含有させた合成樹脂の融点付近の温度が好ましく、樹脂の種類にもよるが１００〜２００℃の範囲で加熱する。また、加圧は、前記雄型により、面圧５〜５０Ｋｇ／ｃｍ２で加圧することが好ましい。なお、図中２２は温度センサであり、雄型の温度を常に検知し、ヒータを制御して雄型を常に一定温度に保っている。 On the other hand, the male die 17 is replaceably attached to the lower end of a rod 19 that is driven up and down by an appropriate driving means, and the outer peripheral surface is tapered in the same manner as the shape of the female concave portion. A hot press surface 20 corresponding to the height of the processing section is provided, and when the male mold descends, the hot press surface 20 pressurizes the inner peripheral surface of the side wall of the container with a predetermined pressure. The male mold 17 has a heater 21 and is configured to be able to be heated to a predetermined temperature, and is always heated to a predetermined temperature during operation. The heating temperature is preferably a temperature in the vicinity of the melting point of the synthetic resin laminated, coated or contained on the side wall of the container, and is heated in the range of 100 to 200 ° C. depending on the type of resin. Moreover, it is preferable to pressurize with the surface pressure of 5-50 kg / cm < 2 > by the said male type | mold. In the figure, reference numeral 22 denotes a temperature sensor that constantly detects the temperature of the male mold and controls the heater to keep the male mold at a constant temperature.

以上のように構成された熱プレス装置１５で、本実施形態の紙製成形容器は、次のように側壁内周面が熱プレス処理されて製造される。
熱プレス装置１５の雄型１７は、予め所定温度に加熱されており、雌型１６の凹部１８内に、前工程でしごき絞り加工によりブランクから図１に示すような形状に形成された成形容器１が供給される。次いで、雄型１７が下降することにより、雄型外周のテーパー面が容器側壁内周面のテーパー面にあたり、該面を押圧しながらさらに下降して、同図（ｂ）に示す状態でしばらく保持することによって、容器の側壁内周面が加熱されて溶融した樹脂が加圧により容器内周面にあるしわの凹部に入り込みしわを目止めするとともに、熱プレス面２０が当った側壁内周面を滑らかな均一面に仕上げる。加圧保持時間は樹脂の融点によっても異なるが、０．１〜５秒の範囲で可能である。したがって、本実施形態によれば簡単な方法で短時間に確実に側壁内周面の微細しわを目止めすることができる。
なお、胴壁外周面は、直接雄型が接触することがないので、熱プレス効果は少なく、外周面の微細なしわを目止めするには至らない。 With the hot press device 15 configured as described above, the paper molded container of the present embodiment is manufactured by subjecting the inner peripheral surface of the side wall to a hot press process as follows.
The male die 17 of the hot press device 15 is heated in advance to a predetermined temperature, and is formed into a shape as shown in FIG. 1 from the blank by a squeezing drawing process in the recess 18 of the female die 16 in the previous step. 1 is supplied. Next, when the male mold 17 is lowered, the tapered surface of the outer periphery of the male mold hits the tapered surface of the inner peripheral surface of the container side wall, and further descends while pressing the surface, and is held for a while in the state shown in FIG. As a result, the inner peripheral surface of the side wall of the container is heated and melted into the concave portion of the wrinkle on the inner peripheral surface of the container by pressurization, and the inner peripheral surface of the side wall against which the hot press surface 20 hits. To a smooth and uniform surface. The pressure holding time varies depending on the melting point of the resin, but can be in the range of 0.1 to 5 seconds. Therefore, according to this embodiment, the fine wrinkles on the inner peripheral surface of the side wall can be ascertained in a short time with a simple method.
Note that the outer peripheral surface of the body wall is not directly in contact with the male mold, so that the hot press effect is small and fine wrinkles on the outer peripheral surface cannot be noticed.

上記実施形態の雄型の加熱は外周面に設けたヒータによって行なったが、それに限らず例えば誘導加熱コイル、あるいは雄型内部に埋め込んだヒータ等適宜の手段が採用できる。また、必ずしも雄型自体を加熱するものに限らず、例えば容器内部に１００〜２００℃のホットエアを吹き込んで加熱してから、雄型により加圧成形するようにすることも可能である。また、雄型の形状も上記のように固定形状に限らず、エキスパンダー状に拡開して容器側壁内周面を押圧するもの、或いは容器内径よりも小径の自転・公転する回転ローラ等が採用可能であり、上記実施形態の装置に限るものではない。   Although the heating of the male mold in the above embodiment is performed by the heater provided on the outer peripheral surface, not limited thereto, for example, an appropriate means such as an induction heating coil or a heater embedded in the male mold can be employed. The male mold itself is not necessarily heated. For example, hot air of 100 to 200 ° C. is blown into the container and heated, and then the male mold is pressure-molded. In addition, the male shape is not limited to the fixed shape as described above, and it is an expander that presses the inner peripheral surface of the container side wall, or a rotating roller that rotates and revolves with a smaller diameter than the inner diameter of the container. It is possible and is not limited to the apparatus of the above embodiment.

上記実施形態の熱プレス装置により、次の条件で上記のしごき絞り加工により成形された紙製成形容器を熱プレス処理して製造した。
容器素材：
ポリプロピレン（２０μｍ）／カップ原紙（２８０ｇ／ｍ２）／ポリプロピレン
（２０μｍ）
熱プレス条件：
雄型表面温度 １６０℃
面圧 ３ＭＰａ
押圧時間 ０．２秒
以上の条件で熱プレス後、成形容器側壁の熱プレス断面を切断して、走査型電子顕微鏡で撮影してその断面形状を観察した。また、比較例として同様にしごき絞り成形により成形した成形容器のプレスを行なっていない状態での側壁内周面部位の断面を同様に走査型電子顕微鏡で撮影して観察した。得られた電子顕微鏡断面写真を図３に示す。該図は前記顕微鏡写真をスキャナーで読み込み分かり易くするために、背景を消去したものであり、図において（ａ）は熱プレス前、即ち初期の状態の断面の３５倍拡大写真であり、同様に（ｂ）は熱プレス後の断面の３５倍拡大写真である。そして、（ｃ）及び（ｄ）はそれぞれの要部の１００倍拡大写真である。該写真から明らかなように、熱プレス前は側壁の内周面６及び外周面７とも微細な線状窪みとなっている微細しわ８が所定間隔で生じていることが観察される。しかしながら、熱プレス後は（ｂ）、（ｄ）に示すように、内周面６の微細しわによる線状窪みはなくなっており、１００倍に拡大した（ｄ）の写真で線状窪み部に溶融樹脂９によって埋められているのが観察される。一方外周面７の線状しわは熱プレス前と比べてより小さくはなっているが、凹部への溶融樹脂の充填はなく、線状窪みは存在していることが観察される。 With the hot press apparatus of the said embodiment, the paper-made container shape | molded by said ironing drawing process on the following conditions was hot-press-processed and manufactured.
Container material:
Polypropylene (20 μm) / Cup base paper (280 g / m 2 ) / Polypropylene (20 μm)
Heat press conditions:
Male mold surface temperature 160 ° C
Surface pressure 3MPa
Pressing time 0.2 seconds After hot pressing under the conditions above, the hot press cross section of the side wall of the forming container was cut, photographed with a scanning electron microscope, and the cross sectional shape was observed. Further, as a comparative example, a cross section of the inner peripheral surface portion of the side wall in a state where the forming container formed by iron drawing was not pressed was similarly photographed and observed with a scanning electron microscope. The obtained electron microscope cross-sectional photograph is shown in FIG. The figure shows the micrograph read with a scanner for easy understanding, and the background is erased. In the figure, (a) is a 35 times magnified photograph of the cross-section in the initial state before hot pressing. (B) is a 35 times enlarged photograph of the cross section after hot pressing. And (c) and (d) are 100 times magnified photographs of the respective main parts. As is apparent from the photograph, it is observed that fine wrinkles 8 that are fine linear depressions are formed at predetermined intervals on the inner peripheral surface 6 and the outer peripheral surface 7 of the side wall before hot pressing. However, after the hot pressing, as shown in (b) and (d), the linear depression due to the fine wrinkles on the inner peripheral surface 6 disappears, and the linear depression in the photograph of (d) enlarged 100 times is shown. It is observed that it is filled with the molten resin 9. On the other hand, the linear wrinkles on the outer peripheral surface 7 are smaller than those before hot pressing, but it is observed that there is no filling of the molten resin into the concave portions and there are linear depressions.

実施例１で製造した成形容器に内容物として、酢豚を充填し保存温度５℃で３日間保存し、内容物液分の毛細現象による側壁内面の上昇状態を観察した。なお、本実施例で使用した成形容器は、容器の内周面高さのほぼ上部１／３に熱プレス処理を施してあり、内容物は該熱プレス処理部よりも下方位置まで充填した。また、比較例として、実施例１と同様に熱プレス処理を施してないしごき絞り成形により成形した紙製成形容器に同様の内容物を同量充填し、保存温度５℃で３日間保存し、内容物液分の毛細現象による側壁内面の上昇状態を観察した。その状態の写真を図４に示す。その結果、熱プレスを行なってない比較例のものは、図４（ｄ）に示すように、内容物充填３日後には内容液分が毛細管現象により筋状にカール部まで上昇していることが確認された。なお、この状態は図５（ｃ）に模式的に示されている。これに対し、実施例のものは、熱プレス処理部に達するまでは液分上昇の筋が観察されたが、熱プレス処理部から上部には液分上昇は観察されず、毛細管現象の発生が確実に阻止されていることが確認された。   The molded container manufactured in Example 1 was filled with sweet and sour pork as the contents and stored for 3 days at a storage temperature of 5 ° C., and the rising state of the inner surface of the side wall due to the capillary phenomenon of the contents liquid was observed. Note that the molded container used in this example was subjected to a hot press process on substantially the upper third of the inner peripheral surface height of the container, and the contents were filled to a position below the hot press process part. In addition, as a comparative example, the same content is filled in a paper molding container which is not subjected to hot press treatment as in Example 1 and is formed by squeeze drawing, and is stored at a storage temperature of 5 ° C. for 3 days. The rising state of the inner surface of the side wall due to the capillary action of the content liquid was observed. A photograph of this state is shown in FIG. As a result, as shown in FIG. 4D, in the comparative example in which the heat press was not performed, the content liquid content rises to the curled portion in a streak shape by capillary action after 3 days of filling the content. Was confirmed. This state is schematically shown in FIG. On the other hand, in the example, streaks of the liquid component were observed until reaching the heat press processing unit, but no liquid component increase was observed in the upper part from the heat press processing unit, and the capillary phenomenon occurred. It was confirmed that it was definitely blocked.

本発明の紙製成形容器は、紙を主材とした合成樹脂を含む容器成形材から絞り成形された成形容器であり、その形状は断面円形の容器に限らず、楕円状、矩形状等種々の断面形状に適用可能である。また、底浅容器に限らず、深絞成形も可能であり、その用途も水分を含む内容物の充填、及び内容物を電子レンジで容器ごと加熱して処理可能であり、安価な使い捨て容器の利用範囲を拡大するものである。   The paper-molded container of the present invention is a molded container formed by drawing from a container molding material containing a synthetic resin whose main material is paper, and the shape is not limited to a container with a circular cross section, but various shapes such as an elliptical shape and a rectangular shape. It is applicable to the cross-sectional shape. In addition to the shallow bottom container, deep drawing is possible, and its use can be filled with moisture-containing contents, and the contents can be processed by heating the container together with a microwave oven. It expands the range of use.

（ａ）は本発明の紙製成形容器の一部破断正面図であり、（ｂ）はそのＡ−Ａ断面の一部拡大図である。(A) is the partially broken front view of the paper-made container of this invention, (b) is the partially expanded view of the AA cross section. 熱プレス装置による熱プレス処理工程を示す概略図であり、（ａ）は熱処理開始前の状態、（ｂ）は熱プレス中の状態を示している。It is the schematic which shows the hot press processing process by a hot press apparatus, (a) has shown the state before heat processing start, (b) has shown the state in hot press. 熱プレス処理前と熱プレス処理後（実施例）の成形容器の側壁断面の電子顕微鏡写真を示し、（ａ）は熱プレス処理前の３５倍拡大写真、（ｂ）は熱プレス処理後の３５倍拡大写真、（ｃ）及び（ｄ）はそれぞれの１００倍拡大写真である（実施例１）。The electron micrograph of the side wall cross section of the molding container before and after the hot press treatment (Example) is shown, (a) is a 35 times magnified photograph before the hot press treatment, and (b) is 35 after the hot press treatment. Double-magnified photographs (c) and (d) are 100-magnified photographs (Example 1). 熱プレス処理済みの成形容器（実施例２）及び熱プレス処理なしの成形容器に酢豚を充填して、容器の側壁内周面での毛細管発生状況を示す写真で、（ａ）は熱プレス処理済みの容器に酢豚を充填した初期の状態、（ｂ）は３日経過後の状態、（ｃ）は熱プレス処理なしの成形容器（比較例）に酢豚を充填した初期の状態、（ｄ）はその３日経過後の状態をそれぞれ示している。Fig. 2 is a photograph showing the state of capillary generation on the inner peripheral surface of the side wall of the container after filling the hot-pressed molded container (Example 2) and the molded container without the hot-press process with sweet and sour pork. (B) is the state after 3 days have passed, (c) is the initial state of filling the sweetened pork in a molded container (comparative example) without heat press treatment, (d) The state after the lapse of 3 days is shown. しごき絞り成形法によって成形した熱プレス処理なしの状態の紙製成形容器を示し、（ａ）はその正面断面図、（ｂ）はそのＢ−Ｂ断面の電子顕微鏡写真、（ｃ）は内容物を充填した状態の正面断面模式図である。1 shows a paper-molded container formed by a squeezing drawing method without a heat press treatment, wherein (a) is a front sectional view, (b) is an electron micrograph of the BB section, and (c) is a content. It is a front cross-sectional schematic diagram of the state filled up.

符号の説明Explanation of symbols

１ 紙製成形容器 ２ 胴壁
３ 熱プレス処理部 ４ 開口端部
６ 胴壁内周面 ８ 微細しわ
９ 溶融樹脂 １５ 熱プレス装置
１６ 雌型 １７ 雄型
１８ 凹部 １９ ロッド
２０ 熱プレス面 ２１ ヒータ DESCRIPTION OF SYMBOLS 1 Paper molding container 2 Body wall 3 Heat press process part 4 Open end part 6 Body wall inner peripheral surface 8 Fine wrinkles 9 Molten resin 15 Hot press apparatus 16 Female type | mold 17 Male type | mold 18 Recessed part 19 Rod 20 Heat-pressed surface 21 Heater

Claims (6)

紙を主材とし表面に合成樹脂層または合成樹脂含浸層を有する容器成形材を絞り成形してなる紙製成形容器であって、前記容器成形材をしごき絞り加工により成形して胴壁の内周面及び外周面に微細な線状のしわが形成された紙製成形容器の胴壁の内周面に、前記線状の微細なしわの窪みが前記容器成形材から溶融した合成樹脂により埋めて目止される熱プレス処理部が形成されてなり、内容物の液汁が毛細管現象による容器開口端へ上昇することを阻止するようにしてなることを特徴とする紙製成形容器。 A paper-molded container formed by drawing a container molding material having paper as a main material and having a synthetic resin layer or a synthetic resin-impregnated layer on the surface, and the container molding material is molded by ironing and drawing, the inner peripheral surface of the peripheral surface and the outer peripheral surface to a fine linear wrinkles formed paper molded container body wall, filled with synthetic resin depression of the linear fine wrinkles is melted from the container forming material hot pressing portion is formed of Ru is unplugged Te, paper molded container juice, characterized in that is so as to prevent the rise into the container open end by capillary action of the contents. 前記熱プレス処理部が、少なくとも該容器に充填される内容物の液面上方位置から所定高さ範囲を含むリング状範囲を加熱・加圧成形することにより形成されてなる請求項１に記載の紙製成形容器。   The said hot press process part is formed by heating and press-molding the ring-shaped range including the predetermined height range from the liquid level upper position of the content with which this container is filled at least. Paper molded container. 前記微細なしわが胴壁内方に向かう開口幅０．５ｍｍ以下の微細な線状窪みである請求項１又は２に記載の紙製成形容器。   The paper molding container according to claim 1 or 2, wherein the fine wrinkle is a fine linear depression having an opening width of 0.5 mm or less toward the inside of the body wall. 紙を主材とし表面に合成樹脂層または合成樹脂含浸層を有する容器成形材を絞り成形してなる紙製成形容器の製造方法であって、前記容器成形材をしごき絞り加工により成形して胴壁の内周面及び外周面にほぼ縦方向に微細な線状の縦しわが形成されてなる紙製成形容器を形成し、且つ前記胴壁の内周面を１００〜２００℃に加熱し、面圧５〜５０Ｋｇ／ｃｍ２で加圧することにより、前記容器成形材の合成樹脂を溶融させ、該溶融した合成樹脂で胴壁内周面の前記線状の微細な縦しわの窪みを目止めして熱プレス処理部を形成することを特徴とする紙製成形容器の製造方法。 A method for producing a paper-molded container obtained by drawing a container molding material having a paper as a main material and having a synthetic resin layer or a synthetic resin-impregnated layer on the surface, wherein the container molding material is molded by ironing and drawing. Forming a paper molding container in which fine linear vertical wrinkles are formed in a substantially vertical direction on the inner peripheral surface and outer peripheral surface of the wall, and heating the inner peripheral surface of the body wall to 100 to 200 ° C .; By pressurizing at a surface pressure of 5 to 50 kg / cm 2 , the synthetic resin of the container molding material is melted, and the melted synthetic resin is used to prevent the hollow fine vertical wrinkles on the inner peripheral surface of the body wall And forming a hot press processing section. 前記加熱は成形容器内周面に加熱した熱板を押圧することにより行なう請求項４に記載の紙製成形容器の製造方法。   The method for producing a paper molded container according to claim 4, wherein the heating is performed by pressing a heated hot plate on the inner peripheral surface of the molded container. 前記加熱は、容器内部にホットエアを吹きつけることにより行なう請求項４に記載の紙製成形容器の製造方法。   The method for manufacturing a paper molded container according to claim 4, wherein the heating is performed by blowing hot air inside the container.
JP2004033383A 2004-02-10 2004-02-10 Paper molding container Expired - Lifetime JP4666925B2 (en)

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