JP5903972B2 - Foam insulation paper container sheet and foam insulation paper container using the same - Google Patents

Foam insulation paper container sheet and foam insulation paper container using the same Download PDF

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JP5903972B2
JP5903972B2 JP2012068480A JP2012068480A JP5903972B2 JP 5903972 B2 JP5903972 B2 JP 5903972B2 JP 2012068480 A JP2012068480 A JP 2012068480A JP 2012068480 A JP2012068480 A JP 2012068480A JP 5903972 B2 JP5903972 B2 JP 5903972B2
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paper
thermoplastic resin
resin layer
container
sheet
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JP2012214038A (en
JP2012214038A5 (en
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紗登美 森永
紗登美 森永
博 紺屋本
博 紺屋本
福永　正明
正明 福永
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Nippon Paper Industries Co Ltd
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Description

本発明は、発泡断熱紙製容器用シートの製造方法、及びそれを用いた発泡断熱紙製容器に
関する。さらに詳細には、自動販売機等に利用されるホットコーヒーなどの充填用の発泡
断熱紙製容器、熱湯を注入するインスタント食品用の発泡断熱紙製容器、電子レンジによ
る調理用の容器等に利用される発泡断熱紙製容器用シートの製造方法、及びそれを用いた
発泡断熱紙製容器の製造方法に関する。
The present invention relates to a method for producing a sheet for a foam insulated paper container, and a foam insulated paper container using the same. More specifically, it is used for foamed insulated paper containers for filling hot coffee etc. used in vending machines, etc., foamed insulated paper containers for instant food to inject hot water, containers for cooking with microwave ovens, etc. process for producing a sheet for foam insulating paper container is, and a method of manufacturing a foamed insulating paper containers using the same.

ハンバーガーショップなどのファーストフード店や列車の車内、自動販売機などで、コーヒーなどの温飲料やスープなどの温食品を購入者に提供するための容器、あるいはカップ入り即席ラーメン用容器などでは、一般的に断熱性容器が使用されている。
従来、このような用途に使用される断熱性容器としては、発泡ポリスチレン（ＥＰＳ）製のものが知られている。これはポリスチレンに発泡剤を加えた原料をモールド内に注型し、原料に熱と圧力を加えて発泡、成形させることにより製造される。このようにして得られた発泡ポリスチレン製断熱性容器は、容器全体を発泡させているため嵩があり、断熱性の点では非常に優れているが使用後のゴミの量が多くなる。また、発泡ポリスチレンは、焼却処分する際に高熱を発するため焼却炉を損傷しやすい、環境ホルモンとして人体への悪影響が懸念されるなどの理由に加え、石油資源の節約という観点からもその使用の見直しが求められている。
さらに、発泡ポリスチレン製断熱性容器の外表面には微小な凹凸が多数存在するため、容器の外表面に模様、文字、記号などを印刷しても鮮明に表現されないこと、また、紙製断熱性容器比べると肉厚強度が弱く、カップ入り即席ラーメン用などの比較的大きな容器の場合、輸送中に割れたりすることなどの問題があった。
これらの問題に対して、特許文献１には、容器胴部材及び底板部材からなる紙製容器において、容器胴部材の外壁面に低融点の熱可塑性合成樹脂フィルムをラミネートし、加熱することにより、基材である紙に含まれている水分の蒸気圧を利用してフィルムを凹凸に発泡させる技術が開示されている。また、特許文献２には、胴部材の一方の壁面に、紙の表面側から低融点の熱可塑性樹脂の発泡内層とこれよりも高い融点を有する熱可塑性樹脂の非発泡外層とからなる２層構造断熱膜が被着されており、発泡内層と紙との層間強度、紙の坪量、発泡層および非発泡外層の膜厚を規定した紙製容器が開示されている。
特許文献３には、容器胴部、底板、外装スリーブからなる紙製容器において、容器胴部の裾胴部分を全周にわたり突出させた突出部と、容器胴部の上胴部分にかけて外装スリーブを接着して断熱空間を形成した紙製容器が開示されている。 In a fast food store such as a hamburger shop, in a train, in a vending machine, etc., a container for supplying hot drinks such as coffee or hot food such as soup to the purchaser, or a container for instant ramen in cups, etc. Insulating containers are used.
Conventionally, the thing made from an expanded polystyrene (EPS) is known as a heat insulation container used for such a use. This is manufactured by pouring a raw material obtained by adding a foaming agent to polystyrene into a mold, and foaming and molding the raw material by applying heat and pressure. The foamed polystyrene heat insulating container thus obtained is bulky because the entire container is foamed, and is very excellent in terms of heat insulation, but the amount of dust after use increases. In addition to the reasons that expanded polystyrene generates high heat when incinerated, it is easy to damage the incinerator, and there are concerns about adverse effects on the human body as an environmental hormone. A review is required.
In addition, since there are many minute irregularities on the outer surface of the expanded polystyrene heat insulating container, even if patterns, letters, symbols, etc. are printed on the outer surface of the container, it is not clearly expressed. Compared with containers, the wall thickness is weak, and relatively large containers for instant ramen with cups have problems such as cracking during transportation.
For these problems, in Patent Document 1, in a paper container composed of a container body member and a bottom plate member, by laminating and heating a low-melting thermoplastic synthetic resin film on the outer wall surface of the container body member, A technique for foaming a film into irregularities by utilizing the vapor pressure of moisture contained in paper as a base material is disclosed. Further, Patent Document 2 discloses that two layers comprising a foamed inner layer of a thermoplastic resin having a low melting point and a non-foamed outer layer of a thermoplastic resin having a higher melting point on one wall surface of the body member from the paper surface side. A paper container is disclosed which is provided with a structural heat insulating film and which defines the interlaminar strength between the foamed inner layer and the paper, the basis weight of the paper, and the film thickness of the foamed layer and the non-foamed outer layer.
In Patent Document 3, in a paper container composed of a container body, a bottom plate, and an outer sleeve, an outer sleeve is provided over a projecting portion in which a skirt body portion of the container body is protruded over the entire circumference and an upper body portion of the container body. A paper container that is bonded to form a heat insulating space is disclosed.

特開昭５７−１１０４３９号公報JP-A-57-110439 特開平０５−０４２９２９号公報JP 05-042929 A 特開２００１−０９７３５５号公報JP 2001-097355 A

特許文献１および特許文献２に記載の容器の基材は紙が主体であり、石油を原料とする熱可塑性樹脂は、発泡により容器に断熱性を付与するために必要な程度に抑えられている。そのため、全体が発泡ポリスチレンからなる容器に比べて石油の使用量が少なく、環境負荷が小さい。また、発泡ポリスチレン製容器に比べて容器の外表面の凹凸が少ないため、美麗性にも優れる。しかし、特許文献１および特許文献２に記載の容器は、基材中の紙に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる機構であることから、紙に含まれる水分が少ないと熱可塑性樹脂層の発泡が不十分となり、得られた容器の断熱性が劣るという問題がある。基材中の紙の坪量を高くすると水分の総量が多くなるため、発泡性は良好となるが、容器の成形加工適性が低下するという問題がある。特許文献３に記載の容器の基材は紙のみであり、石油を原料とする熱可塑性樹脂を使用する必要がないため環境負荷が小さく、発泡ポリスチレン製容器に比べて容器の外表面の凹凸が少ないため、美麗性にも優れるが、断熱性が十分とはいえない。そのため、本発明は、十分な断熱性を有し、容器の成形加工適性と美麗性に優れる発泡断熱紙製容器用シートの製造方法、及びそれを用いた発泡断熱紙製容器の製造方法を提供することを目的とする。
The base material of the container described in Patent Document 1 and Patent Document 2 is mainly paper, and the thermoplastic resin that uses petroleum as a raw material is suppressed to a level necessary for imparting heat insulation to the container by foaming. . Therefore, the amount of oil used is small and the environmental load is small compared to a container made entirely of expanded polystyrene. Moreover, since there are few unevenness | corrugations on the outer surface of a container compared with the container made from a polystyrene foam, it is excellent also in beauty. However, the containers described in Patent Document 1 and Patent Document 2 are included in the paper because it is a mechanism that heats and evaporates the water contained in the paper in the base material and foams the thermoplastic resin layer with the generated water vapor. If the moisture content is small, foaming of the thermoplastic resin layer becomes insufficient, and there is a problem that the heat insulation of the obtained container is inferior. When the basis weight of the paper in the base material is increased, the total amount of moisture increases, so that foamability is improved, but there is a problem that suitability for molding of the container is lowered. The base material of the container described in Patent Document 3 is only paper, and there is no need to use a thermoplastic resin made from petroleum. Therefore, the environmental load is small, and the outer surface of the container has unevenness compared to a foamed polystyrene container. Since it is few, it is excellent in beauty, but it cannot be said that the heat insulation is sufficient. Therefore, the present invention has sufficient heat insulating property, a method of manufacturing a foamed insulating paper containers sheet excellent in molding processability and beautiful of the container, and provides a method for producing a foamed insulating paper containers using the same The purpose is to do.

本発明は、以下の（１）〜（３）を提供する。
（１）紙基材の少なくとも片面に熱可塑性樹脂層を積層した発泡断熱紙製容器用シートの製造方法において、該紙基材の表面がカレンダーサイズプレスによって処理を施された前記紙基材の熱可塑性樹脂層を積層する面の王研式平滑度が５８〜１２０ｓ／１０ｍｌ、且つ坪量あたりの透気抵抗度が０．８８〜１．３１ｓ／ｇ／ｍ２であることを特徴とする発泡断熱紙製容器用シートの製造方法。
（２）前記紙基材の熱可塑性樹脂層を積層する面の王研式平滑度が６１〜８５ｓ／１０ｍｌ、且つ坪量あたりの透気抵抗度が０．８８〜１．０９ｓ／ｇ／ｍ２であることを特徴とする（１）に記載の発泡断熱紙製容器用シートの製造方法。
（３）（１）または（２）に記載の製造方法で製造した発泡断熱紙製容器用シートを胴部材及び／又は底板部材に用いることを特徴とするとともに、前記発泡断熱紙製容器用シートの前記紙基材が含有する水分を加熱蒸発させ、前記熱可塑性樹脂層を発泡させて得られることを特徴とする発泡断熱紙製容器の製造方法。
The present invention provides the following (1) to (3).
(1) In the method for producing a foam insulated paper container sheet in which a thermoplastic resin layer is laminated on at least one side of a paper substrate, the surface of the paper substrate is treated with a calendar size press. Foam characterized by having a Oken-type smoothness of 58 to 120 s / 10 ml on the surface on which the thermoplastic resin layer is laminated and an air permeability resistance per basis weight of 0.88 to 1.31 s / g / m 2. A method for producing a sheet for a container made of insulated paper.
(2) Oken type smoothness of the surface of the paper base material on which the thermoplastic resin layer is laminated is 61 to 85 s / 10 ml, and the air resistance per basis weight is 0.88 to 1.09 s / g / m 2. The manufacturing method of the sheet | seat for foam insulated paper containers as described in (1) characterized by these.
(3) The foamed insulated paper container sheet produced by the production method according to (1) or (2) is used for a body member and / or a bottom plate member, and the foamed insulated paper container sheet A method for producing a foam heat-insulating paper container obtained by heating and evaporating water contained in the paper substrate and foaming the thermoplastic resin layer.

本発明によれば、十分な断熱性を有し、容器の成形加工適性と美麗性に優れる発泡断熱紙製容器用シートの製造方法、及びそれを用いた発泡断熱紙製容器の製造方法を提供することができる。
According to the present invention has sufficient heat insulating property, a method of manufacturing a foamed insulating paper containers sheet excellent in molding processability and beautiful of the container, and provides a method for producing a foamed insulating paper containers using the same can do.

紙基材の少なくとも片面に熱可塑性樹脂層を積層した発泡断熱紙製容器用シートの製造方法において、該紙基材の表面がカレンダーサイズプレスによって処理を施されてなることを特徴とする発泡断熱紙製容器用シートの製造方法、及びこの発泡断熱紙製容器用シートを胴部材及び／又は底板部材に用いることを特徴とするとともに、前記発泡断熱紙製容器用シートの前記紙基材が含有する水分を加熱蒸発させ、前記熱可塑性樹脂層を発泡させて得られることを特徴とする発泡断熱紙製容器の製造方法である。


In a method for producing a sheet for a foam insulated paper container in which a thermoplastic resin layer is laminated on at least one side of a paper substrate, the foamed heat insulation is characterized in that the surface of the paper substrate is treated by a calendar size press. A method for producing a sheet for paper container, and using the foam insulating paper container sheet for a body member and / or a bottom plate member, and the paper base of the foam insulating paper container sheet contains It is a method for producing a foamed insulated paper container , which is obtained by evaporating water to be heated and foaming the thermoplastic resin layer.


［パルプ］
本発明の紙基材は、高濃度叩解したパルプ（以下、「高濃度叩解パルプ」ともいう。）を含有することが好ましい。本発明において、高濃度叩解とは、パルプを叩解する際のパルプ濃度が２０〜３５重量％の範囲であることを意味する。
この高濃度叩解によれば、パルプ濃度が３〜６重量％の範囲で行う通常の叩解の場合に比べ、パルプ繊維の切断が少なくなり、フィブリル化が促進されるので、パルプの比表面積と柔軟性が増加する。そのため、本発明の紙基材に高濃度叩解パルプを含有させ、発泡断熱紙製容器用シート、及びそれを用いた発泡断熱紙製容器に使用すると、成形加工適性と美麗性が優れる。さらに、本発明の紙基材に高濃度叩解パルプを含有させ、発泡断熱紙製容器用シート、及びそれを用いた発泡断熱紙製容器に使用すると、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、フィブリル化が促進され比表面積が増加した、即ち、網目状態が発達したパルプ繊維の緩衝作用により水蒸気が均質に放出されるため、発泡が良好かつ均質となると推察され、十分な断熱性を有する発泡断熱紙製容器が得られると推察される。
パルプを叩解する際のパルプ濃度が２０重量％未満であると、高濃度叩解により得られる前述の特性が十分に得られない。また、３５重量％を超えると、叩解時のパルプスラリーの流動性が低下するため、安定した叩解が困難となる。 [pulp]
The paper base material of the present invention preferably contains pulp with a high concentration of beating (hereinafter also referred to as “high concentration beating pulp”). In the present invention, the high concentration beating means that the pulp concentration when beating the pulp is in the range of 20 to 35% by weight.
According to this high concentration beating, the pulp fiber is cut less and fibrillation is promoted than in the case of normal beating performed in a pulp concentration range of 3 to 6% by weight. Sex increases. Therefore, when the paper base material of the present invention contains a high-concentration beaten pulp and is used for a foam insulated paper container sheet and a foam insulated paper container using the same, the molding processability and the beauty are excellent. Furthermore, when the paper base material of the present invention contains a high-concentration beaten pulp and is used in a foam insulation paper container sheet and a foam insulation paper container using the same, moisture contained in the paper base material is evaporated by heating. When the thermoplastic resin layer is foamed with the generated water vapor, the fibrillation is promoted and the specific surface area is increased, that is, the water vapor is released homogeneously by the buffering action of the pulp fiber in which the network state is developed. It is inferred that foaming is good and homogeneous, and it is speculated that a foamed insulated paper container having sufficient heat insulation is obtained.
When the pulp concentration when beating the pulp is less than 20% by weight, the above-mentioned characteristics obtained by high concentration beating cannot be sufficiently obtained. On the other hand, if it exceeds 35% by weight, the fluidity of the pulp slurry at the time of beating is lowered, so that stable beating becomes difficult.

本発明の高濃度叩解パルプは、パルプ濃度が前記範囲であれば叩解方法や叩解装置は特に限定されるものではなく、通常パルプを叩解する際に使用する各種リファイナー、ビーター等を使用することができるが、バウアー型のダブルディスクリファイナー（ＤＤＲという）等の叩解機を使用すると、高濃度叩解が容易であるため好ましい。
また、本発明の高濃度叩解パルプは、カナダ標準ろ水度（以下、「Ｃ．Ｓ．Ｆ．」とする）を１２０〜２８０ｍｌとすることが好ましい。Ｃ．Ｓ．Ｆ．が１２０ｍｌ未満であると、紙基材の抄紙工程での脱水が遅く、操業性が劣ることがある。また、Ｃ．Ｓ．Ｆ．が２８０ｍｌを超えると、紙基材としての紙力が低下し、高濃度叩解により得られる前述の特性が十分に得られないことがある。より好ましくは、Ｃ．Ｓ．Ｆ．が１５０〜２３０ｍｌである。 In the high concentration beating pulp of the present invention, the beating method and the beating apparatus are not particularly limited as long as the pulp concentration is in the above range, and it is possible to use various refiners, beaters, etc. that are usually used when beating pulp. However, it is preferable to use a beating machine such as a Bauer double disc refiner (referred to as DDR) because high concentration beating is easy.
The high-concentration beaten pulp of the present invention preferably has a Canadian standard freeness (hereinafter referred to as “C. S. F.”) of 120 to 280 ml. C. S. F. Is less than 120 ml, dehydration of the paper base material in the paper making process is slow, and the operability may be inferior. In addition, C.I. S. F. When the amount exceeds 280 ml, the paper strength as a paper substrate is lowered, and the above-mentioned characteristics obtained by high concentration beating may not be sufficiently obtained. More preferably, C.I. S. F. Is 150-230 ml.

本発明において、高濃度叩解パルプの原料としてのパルプは特に限定されるものではなく、広葉樹、針葉樹を用いた化学パルプ（クラフトパルプ）；広葉樹の晒クラフトパルプ(ＬＢＫＰ）、広葉樹の未晒クラフトパルプ（ＬＵＫＰ)、針葉樹の晒クラフトパルプ(ＮＢＫＰ)、針葉樹の未晒クラフトパルプ(ＮＵＫＰ)、各種機械パルプ；グランドパルプ（ＧＰ)、ケミグランドパルプ（ＣＧＰ）、リファイナグランドパルプ（ＲＧＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ)、非木材パルプ、脱墨パルプ（ＤＩＰ）等を例示することが可能である。これらは単独または２種類以上を混合して高濃度叩解パルプの原料とすることが可能である。
本発明では、高濃度叩解パルプの原料として広葉樹の晒クラフトパルプ(ＬＢＫＰ）を使用すると、高濃度叩解により得られる前述の特性が特に顕著に発揮されるため好ましい。 In the present invention, the pulp as a raw material for the high-concentration beating pulp is not particularly limited, and chemical pulp (craft pulp) using hardwood, conifers; hardwood bleached kraft pulp (LBKP), hardwood unbleached kraft pulp (LUKP), softwood bleached kraft pulp (NBKP), softwood unbleached kraft pulp (NUKP), various mechanical pulps; ground pulp (GP), chemi-ground pulp (CGP), refiner ground pulp (RGP), thermomechanical Examples include pulp (TMP), chemithermomechanical pulp (CTMP), non-wood pulp, deinked pulp (DIP), and the like. These can be used alone or in combination of two or more as raw materials for high concentration beating pulp.
In the present invention, it is preferable to use hardwood bleached kraft pulp (LBKP) as a raw material for high-concentration beating pulp, since the above-mentioned characteristics obtained by high-concentration beating are particularly remarkable.

［紙基材］
本発明の発泡断熱紙製容器用シート、及びそれを用いた発泡断熱紙製容器に使用する紙基材は、紙基材が含有する全パルプに対し、前記高濃度叩解パルプが１０重量％以上５０重量％以下であることが好ましい。
紙基材が含有する全パルプに対し高濃度叩解パルプが１０重量％より少ないと、熱可塑性樹脂層の発泡が不十分となり、十分な断熱性を有する発泡断熱紙製容器が得られず、成形加工適性も劣る傾向が見られる。一方、高濃度叩解パルプが５０重量％より多いと、成形加工適性は良好となるが、熱可塑性樹脂層の発泡時に、過剰な発泡により発泡セルが破裂してしまう現象（以下、「過発泡」ともいう。）が発生しやすい。また、紙基材の抄紙時に水切れが低下し、抄紙速度を低く抑えざるを得ないため製造効率が劣る。過発泡部分は美麗性が劣り、更には断熱性が低下する恐れがあるため、十分な断熱性を有し、美麗性に優れる発泡断熱紙製容器が得られない。より好ましくは、紙基材が含有する全パルプに対し、高濃度叩解パルプが１５重量％以上３５重量％以下である。 [Paper base]
The paper base material used for the foam insulated paper container sheet of the present invention and the foam insulated paper container using the same is 10% by weight or more of the high-concentration beaten pulp with respect to the total pulp contained in the paper base material. It is preferable that it is 50 weight% or less.
When the high-concentration beaten pulp is less than 10% by weight with respect to the total pulp contained in the paper base material, the foaming of the thermoplastic resin layer becomes insufficient, and a foam insulated paper container having sufficient heat insulation cannot be obtained and molded. There is also a tendency for processability to be inferior. On the other hand, if the high-concentration beaten pulp is more than 50% by weight, the moldability is good, but when the thermoplastic resin layer is foamed, the foamed cell bursts due to excessive foaming (hereinafter referred to as “over-foaming”). Is also likely to occur. In addition, water drainage is reduced during papermaking of the paper base, and the papermaking speed must be kept low, resulting in poor production efficiency. The over-foamed portion is inferior in beauty and may further deteriorate in heat insulation, so that a foamed insulated paper container having sufficient heat insulation and excellent in beauty cannot be obtained. More preferably, the high-concentration beaten pulp is 15% by weight or more and 35% by weight or less based on the total pulp contained in the paper base material.

本発明において、前記高濃度叩解パルプ以外のパルプとして、通常の叩解（パルプ濃度が３〜６重量％の範囲）をした上記パルプを単独または２種類以上を混合して使用することができ、特に制限されるものではないが、紙基材が含有する全パルプに対し、針葉樹の晒クラフトパルプ(ＮＢＫＰ)が２０重量％未満であると、紙基材の紙力と均質性、成形加工適性、美麗性のバランスが良好であるため好ましい。   In the present invention, as the pulp other than the high-concentration beating pulp, the above-mentioned pulp that has been subjected to normal beating (pulp concentration in the range of 3 to 6% by weight) can be used alone or in combination of two or more, Although not limited, if the bleached kraft pulp of softwood (NBKP) is less than 20% by weight based on the total pulp contained in the paper base material, the paper strength and homogeneity of the paper base material, suitability for molding, This is preferable because the balance of beauty is good.

［表面処理］
本発明の紙基材は、表面がカレンダーサイズプレスによって処理を施される。紙基材の表面がカレンダーサイズプレスによって処理を施されることにより、優れた効果が得られる理由は次のように推測される。
表面処理が施されていない紙基材を発泡断熱紙製容器用シート、及びそれを用いた発泡断熱紙製容器に使用すると、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、水蒸気が不均質に放出されるため部分的な過発泡が発生しやすい。過発泡部分は美麗性に劣り、更には断熱性が低下する恐れがあるため、十分な断熱性を有し、美麗性に優れる発泡断熱紙製容器が得られない。
また、単に紙基材に表面処理を施し、紙基材の表面に皮膜を形成させることで水蒸気の放出を均質化しようとすると、十分な効果が得られないばかりか水蒸気の放出が阻害され、熱可塑性樹脂層の発泡が不十分となり、十分な断熱性を有する発泡断熱紙製容器を得ることができない。
２ロールサイズプレスあるいはトランスファーロール（ゲートロール）によって紙基材に表面処理を施し、紙基材の表面に皮膜を形成させた場合、紙基材の大きな空隙がある部分には厚い皮膜が形成され、大きな空隙がない部分には薄い皮膜が形成される。即ち、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、紙基材の水蒸気が放出されやすい部分には厚い皮膜、水蒸気が放出されにくい部分には薄い皮膜が形成されているため、従来よりも水蒸気の放出が均質化され、発泡が良好かつ均質となるが、美麗性は十分とはいえない。 [surface treatment]
The surface of the paper substrate of the present invention is treated with a calendar size press. The reason why an excellent effect can be obtained by treating the surface of the paper substrate with a calendar size press is presumed as follows.
When a paper base material that has not been surface-treated is used in a foam insulation paper container sheet and a foam insulation paper container using the same, moisture contained in the paper base material is evaporated by heating to generate water vapor. When foaming the thermoplastic resin layer, water vapor is released inhomogeneously, and partial overfoaming is likely to occur. The over-foamed portion is inferior in beauty and may further deteriorate in heat insulation, so that a foamed insulated paper container having sufficient heat insulation and excellent in beauty cannot be obtained.
In addition, if the paper substrate is simply subjected to a surface treatment and a film is formed on the surface of the paper substrate to attempt to homogenize the release of water vapor, not only a sufficient effect cannot be obtained, but the water vapor release is inhibited, Foaming of the thermoplastic resin layer becomes insufficient, and a foamed insulated paper container having sufficient heat insulation cannot be obtained.
When a paper substrate is surface-treated by a two-roll size press or a transfer roll (gate roll) and a film is formed on the surface of the paper substrate, a thick film is formed in a portion where there is a large gap in the paper substrate. A thin film is formed in a portion without a large gap. That is, when the moisture contained in the paper substrate is heated and evaporated and the thermoplastic resin layer is foamed by the generated water vapor, a thick film or water vapor is difficult to be released on the portion of the paper substrate where water vapor is easily released. Since a thin film is formed on the part, the release of water vapor is made more uniform than before, and the foaming is good and uniform, but the beauty is not sufficient.

一方、カレンダーサイズプレスにより紙基材に表面処理を施した場合、まず紙基材の表面は、表面処理液により水分を付与され柔軟な状態となる。この状態で紙基材がカレンダーサイズプレスにより加圧されると、紙基材の表層部分に偏在する大きな空隙が押しつぶされ、紙基材の表層部分の空隙は小さく且つ均質になる。紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、紙基材の表層部分の空隙の大きさと均質性は、形成される発泡セルの大きさと均質性に大きな影響を有するため、紙基材の表層部分の空隙が小さく均質であると、形成される発泡セルも小さく均質になる。このため、カレンダーサイズプレスにより紙基材に表面処理を施すと、発泡が良好かつ均質となり、しかも美麗性の優れた断熱紙製容器用シート及びそれを用いた発泡断熱紙製容器を得ることができる。
さらに、カレンダーサイズプレスの表面処理液として、ポリビニルアルコール類などの造膜性を有する水溶性高分子を水に溶解させたものを使用すると、２ロールサイズプレスあるいはトランスファーロール（ゲートロール）により表面処理を施した場合と同様に、紙基材の大きな空隙がある部分には厚い皮膜が形成され、大きな空隙がない部分には薄い皮膜が形成される。即ち、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、紙基材の水蒸気が放出されやすい部分には厚い皮膜、水蒸気が放出されにくい部分には薄い皮膜が形成されているため、水蒸気の放出が一層均質化され、特に発泡が良好かつ均質となる。 On the other hand, when the paper substrate is subjected to a surface treatment by a calendar size press, first, the surface of the paper substrate is given a moisture by the surface treatment liquid and becomes flexible. When the paper base is pressed by a calendar size press in this state, the large voids unevenly distributed in the surface layer portion of the paper base are crushed, and the voids in the surface layer portion of the paper base become small and uniform. When the moisture contained in the paper substrate is heated and evaporated and the thermoplastic resin layer is foamed by the generated water vapor, the size and homogeneity of the voids in the surface layer portion of the paper substrate are determined by the size of the foam cell formed. Therefore, if the voids in the surface layer portion of the paper base material are small and uniform, the foamed cells formed are also small and uniform. For this reason, when a paper substrate is subjected to a surface treatment by a calendar size press, foaming is good and uniform, and an insulating paper container sheet having excellent beauty and a foam insulating paper container using the same can be obtained. it can.
Furthermore, when a surface-treating liquid for a calendar size press is prepared by dissolving a water-soluble polymer having a film-forming property such as polyvinyl alcohol in water, the surface is treated by a 2-roll size press or a transfer roll (gate roll). As in the case of applying a thick film, a thick film is formed on a portion of the paper substrate having large voids, and a thin film is formed on a portion without large voids. That is, when the moisture contained in the paper substrate is heated and evaporated and the thermoplastic resin layer is foamed by the generated water vapor, a thick film or water vapor is difficult to be released on the portion of the paper substrate where water vapor is easily released. Since a thin film is formed on the portion, the release of water vapor is made more uniform, and the foaming is particularly good and uniform.

本発明において、カレンダーサイズプレスにより紙基材に表面処理を施すことが必須であり、２ロールサイズプレスあるいはトランスファーロール（ゲートロール）等により紙基材に表面処理を施し、しかる後にカレンダーサイズプレスで表面処理を施すことも可能である。   In the present invention, it is essential to subject the paper base material to a surface treatment by a calendar size press, and the paper base material is subjected to a surface treatment by a two-roll size press or a transfer roll (gate roll), and then the calender size press. A surface treatment can also be applied.

［表面処理液］
本発明で、紙基材に施される表面処理に使用する表面処理液は、水のみであっても表面処理剤を水に溶解させたものであってもよいが、表面処理剤を水に溶解させたものであると、カレンダーサイズプレスによる紙基材の表面処理により得られる前述の特性が顕著に発揮されるため好ましい。
本発明で使用する表面処理剤は、造膜性を有する水溶性高分子であれば特に限定されるものではなく、澱粉、酵素変性澱粉、熱化学変性澱粉、酸化澱粉、エステル化澱粉、エーテル化澱粉（例えば、ヒドロキシエチル化澱粉など）、カチオン化澱粉などの澱粉類、ヒドロキシエチルセルロース、メチルセルロース、エチルセルロース、カルボキシメチルセルロース、アセチルセルロースなどのセルロースエーテル及びその誘導体、ポリアクリルアミド、カチオン性ポリアクリルアミド、アニオン性ポリアクリルアミド、両性ポリアクリルアミドなどのポリアクリルアミド類、完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、カルボキシル変性ポリビニルアルコール、シラノール変性ポリビニルアルコール、カチオン変性ポリビニルアルコール、末端アルキル変性ポリビニルアルコールなどのポリビニルアルコール類などを例示することができ、これらを単独、あるいは２種類以上組み合わせて使用することができる。 [Surface treatment solution]
In the present invention, the surface treatment liquid used for the surface treatment applied to the paper substrate may be water alone or a solution obtained by dissolving the surface treatment agent in water. It is preferable that the resin is dissolved because the above-mentioned characteristics obtained by the surface treatment of the paper substrate by a calendar size press are remarkably exhibited.
The surface treatment agent used in the present invention is not particularly limited as long as it is a water-soluble polymer having film-forming properties. Starch, enzyme-modified starch, thermochemically-modified starch, oxidized starch, esterified starch, etherified Starch (eg, hydroxyethylated starch), starches such as cationized starch, cellulose ethers such as hydroxyethylcellulose, methylcellulose, ethylcellulose, carboxymethylcellulose, acetylcellulose and derivatives thereof, polyacrylamide, cationic polyacrylamide, anionic poly Polyacrylamides such as acrylamide and amphoteric polyacrylamide, fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxyl-modified polyvinyl alcohol, silanol-modified polyvinyl alcohol, cationic modification It can be exemplified polyvinyl alcohol, polyvinyl alcohols such as terminal alkyl-modified polyvinyl alcohol and the like, can be used in combination singly, or two or more kinds.

本発明で、紙基材に施される表面処理に使用する表面処理液として、表面処理剤を水に溶解させたものを使用する場合、表面処理剤の塗工量としては、片面当たり固形分で０．１〜３．０ｇ／ｍ２程度である。片面当たり固形分で０．１ｇ／ｍ２未満であると、紙基材の表面を均一に処理することが困難となり、十分な効果が得られないことがある。また、片面当たり固形分で３．０ｇ／ｍ２を超えると、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、水蒸気の放出が阻害され、熱可塑性樹脂層の発泡が不十分となり、十分な断熱性を有する発泡断熱紙製容器を得ることができないことがある。より好ましくは、片面当たり固形分で０．２〜１．０ｇ／ｍ２である。 In the present invention, when using a surface treatment solution in which the surface treatment agent is dissolved in water as the surface treatment liquid used for the surface treatment applied to the paper substrate, the coating amount of the surface treatment agent is a solid content per one side. And about 0.1 to 3.0 g / m 2 . If the solid content per side is less than 0.1 g / m 2 , it becomes difficult to uniformly treat the surface of the paper substrate, and a sufficient effect may not be obtained. Also, if the solid content per side exceeds 3.0 g / m 2 , the moisture contained in the paper base material is evaporated by heating, and when the thermoplastic resin layer is foamed by the generated water vapor, the release of water vapor is inhibited. As a result, foaming of the thermoplastic resin layer becomes insufficient, and a foamed insulated paper container having sufficient heat insulation may not be obtained. More preferably, the solid content per side is 0.2 to 1.0 g / m 2 .

［その他の外添剤］
本発明では、必要に応じて前記表面処理剤と共に、サイズ剤、耐水化剤、紙力増強剤、分散剤、可塑剤、ｐＨ調整剤、消泡剤、保水剤、防腐剤、着色染料、着色顔料、紫外線防止剤等の各種助剤を適宜併用することができる。 [Other external additives]
In the present invention, the sizing agent, water resistance agent, paper strength enhancer, dispersant, plasticizer, pH adjuster, antifoaming agent, water retention agent, preservative, coloring dye, coloring together with the surface treatment agent as necessary Various auxiliary agents such as pigments and ultraviolet light inhibitors can be used in combination as appropriate.

［抄紙］
本発明の紙基材の抄紙方法、抄紙機の型式は特に限定されるものではなく、長網抄紙機、ツインワイヤー抄紙機、円網抄紙機、ギャップフォーマー、ハイブリッドフォーマー(オントップフォーマー)等の公知の抄紙方法、抄紙機が選択可能である。
また、抄紙時のｐＨは酸性領域（酸性抄紙）、疑似中性領域（疑似中性抄紙）、中性領域（中性抄紙）、アルカリ性領域（アルカリ性抄紙）のいずれでもよく、酸性領域で抄紙した後、紙基材の表面にアルカリ性薬剤を塗布してもよい。 [Paper making]
The paper base paper making method and paper machine type of the present invention are not particularly limited, and are a long paper machine, a twin wire paper machine, a circular paper machine, a gap former, a hybrid former (on-top former). And other known paper making methods and paper machines can be selected.
The pH during papermaking may be any of acidic region (acidic papermaking), pseudo-neutral region (pseudo-neutral papermaking), neutral region (neutral papermaking) and alkaline region (alkaline papermaking). Thereafter, an alkaline agent may be applied to the surface of the paper substrate.

［填料］
本発明で、紙基材を抄紙する際に配合する填料は、製紙分野で一般に使用されている填料が使用可能であり特に限定されるものではない。填料の例としては、クレー、焼成カオリン、デラミネートカオリン、重質炭酸カルシウム、軽質炭酸カルシウム、軽質炭酸カルシウム−シリカ複合物、炭酸マグネシウム、炭酸バリウム、二酸化チタン、酸化亜鉛、酸化珪素、非晶質シリカ、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛などの無機填料、尿素−ホルマリン樹脂、ポリスチレン樹脂、フェノール樹脂、微小中空粒子等の有機填料が例示可能であり、これらは単独または２種類以上を適宜組み合わせて使用可能である。一般に前述の酸性抄紙では、これらの填料から酸溶解性のものを除いたものが使用される。 [Filler]
In the present invention, the filler to be blended when making a paper substrate is not particularly limited, and any filler generally used in the papermaking field can be used. Examples of fillers include clay, calcined kaolin, delaminated kaolin, heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica composite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous Illustrative examples include inorganic fillers such as silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, and zinc hydroxide, and organic fillers such as urea-formalin resin, polystyrene resin, phenol resin, and fine hollow particles. Two or more types can be used in appropriate combination. In general, in the above-mentioned acidic papermaking, those obtained by removing acid-soluble ones from these fillers are used.

本発明で、填料は無配合とすることも可能である。紙基材の填料を無配合とすると、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる際に、発泡性は向上する。一方、紙基材に填料を配合すると、得られる断熱紙製容器用シート及びそれを用いた発泡断熱紙製容器の不透明度が向上する。   In the present invention, it is possible to use no filler. When the filler for the paper base material is not added, the foaming property is improved when the moisture contained in the paper base material is evaporated by heating and the thermoplastic resin layer is foamed by the generated water vapor. On the other hand, when a filler is blended with the paper base material, the opacity of the resulting insulated paper container sheet and the foam insulated paper container using the same is improved.

［内添助剤］
本発明で、紙基材を抄紙する際に、各種内添助剤が必要に応じて適宜選択して使用可能である。内添助剤の例としては、ロジン、アルキルケテンダイマー（ＡＫＤ）、アルケニルこはく酸無水物（ＡＳＡ）等の各種の内添サイズ剤、ノニオン性、カチオン性、両性の各種歩留まり向上剤、濾水度向上剤、紙力向上剤、各種澱粉類、ポリアクリルアミド、尿素樹脂、メラミン樹脂、エポキシ樹脂、ポリアミド樹脂、ポリアミド、ポリアミン樹脂、ポリアミン、ポリエチレンイミン、植物ガム、ポリビニルアルコール、ラテックス、ポリエチレンオキサイド、親水性架橋ポリマー粒子分散物及びこれらの誘導体あるいは変性物等、硫酸バンド、塩化アルミニウム、アルミン酸ソーダ、塩基性塩化アルミニウム、塩基性ポリ水酸化アルミニウム等の塩基性アルミニウム化合物、水に易分解性のアルミナゾル等の水溶性アルミニウム化合物、硫酸第一鉄、硫酸第二鉄等の多価金属化合物、シリカゾル、消泡剤、着色染料、着色顔料、蛍光増白剤、ｐＨ調整剤、ピッチコントロール剤、スライムコントロール剤等が例示可能である。 [Internal additive]
In the present invention, when making a paper substrate, various internal additives can be appropriately selected and used as necessary. Examples of internal additives include various internal sizing agents such as rosin, alkyl ketene dimer (AKD), and alkenyl succinic anhydride (ASA), nonionic, cationic and amphoteric various yield improvers, filtered water Strength improver, paper strength improver, various starches, polyacrylamide, urea resin, melamine resin, epoxy resin, polyamide resin, polyamide, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide, hydrophilic Basic polymer compounds such as sulfuric acid band, aluminum chloride, sodium aluminate, basic aluminum chloride, basic polyaluminum hydroxide, water-degradable alumina sol Water-soluble aluminum compounds such as sulfuric acid Monoferric, polyvalent metal compounds such as ferric sulfate, silica sol, defoamers, coloring dyes, coloring pigments, fluorescent brightening agents, pH adjusting agents, pitch control agents, slime control agents or the like can be exemplified.

［水分量］
本発明は、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層を発泡させる機構であることから、紙基材に含まれる水分量が重要である。紙基材に含まれる水分量は、紙基材の坪量及び含水率により決定されるが、本発明の紙基材に含まれる水分量は、好ましくは５〜６０ｇ／ｍ２であり、より好ましくは１０〜４０ｇ／ｍ２であり、さらに好ましくは１５〜４０ｇ／ｍ２である。 [amount of water]
Since the present invention is a mechanism for heating and evaporating moisture contained in a paper substrate and foaming a thermoplastic resin layer with the generated water vapor, the amount of moisture contained in the paper substrate is important. The amount of water contained in the paper substrate is determined by the basis weight and moisture content of the paper substrate, but the amount of water contained in the paper substrate of the present invention is preferably 5 to 60 g / m 2 , more Preferably it is 10-40 g / m < 2 >, More preferably, it is 15-40 g / m < 2 >.

［坪量］
本発明の紙基材の坪量は、好ましくは１００〜４００ｇ／ｍ２であり、より好ましくは２００〜４００ｇ／ｍ２であり、さらに好ましくは２５０〜４００ｇ／ｍ２である。紙基材の坪量が１００ｇ／ｍ２未満であると、得られた発泡断熱紙製容器を手で把持したときに熱さを感じやすい。一方、紙基材の坪量が４００ｇ／ｍ２を超えると、発泡断熱紙製容器の成形加工適性が低下する傾向が見られる。 [Basis weight]
The basis weight of the paper base material of the present invention is preferably 100 to 400 g / m 2 , more preferably 200 to 400 g / m 2 , and further preferably 250 to 400 g / m 2 . When the basis weight of the paper substrate is less than 100 g / m 2, it is easy to feel heat when the obtained foamed insulated paper container is gripped by hand. On the other hand, when the basis weight of the paper substrate exceeds 400 g / m 2 , the tendency of the molding processability of the foam insulated paper container to be reduced is observed.

［密度］
本発明の紙基材の密度は所望に応じて適宜設定すればよく、特に限定されることはないが、０．６０〜０．９９ｇ／ｃｍ３とすることが好ましい。紙基材の密度が低いと、熱可塑性樹脂層を発泡させる際に水蒸気が通りやすくなり、発泡性が向上する傾向が見られるが、紙基材の密度が０．６０ｇ／ｃｍ３未満であると、発泡断熱紙製容器に必要な紙力が得られないことがある。一方、紙基材の密度が０．９９ｇ／ｃｍ３を超えると、熱可塑性樹脂層を発泡させる際に水蒸気が通りにくくなり、発泡性が低下する傾向が見られる。 [density]
The density of the paper substrate of the present invention may be appropriately set as desired, and is not particularly limited, but is preferably 0.60 to 0.99 g / cm 3 . When the density of the paper base is low, water vapor easily passes when foaming the thermoplastic resin layer, and a tendency to improve foamability is observed, but the density of the paper base is less than 0.60 g / cm 3. In some cases, the paper strength required for the foam insulated paper container may not be obtained. On the other hand, when the density of the paper substrate exceeds 0.99 g / cm 3 , it is difficult for water vapor to pass through when foaming the thermoplastic resin layer, and the foamability tends to decrease.

［紙面ｐＨ］
本発明の紙基材は、その表面のｐＨを６以下とすることが好ましい。紙基材表面のｐＨがアルカリ性側であると、パルプ繊維は水を保持しやすい状態であるが、酸性側、特にｐＨが６以下であると、水を放出しやすくなるため、発泡性が良好となると考えられる。 [PH of paper]
The paper substrate of the present invention preferably has a surface pH of 6 or less. When the pH of the paper substrate surface is on the alkaline side, the pulp fiber is in a state where it is easy to retain water. However, when the pH is 6 or less on the acidic side, water tends to be released, so foamability is good. It is thought that it becomes.

本発明の紙基材は、平滑性を付与し美麗性を向上させるなどの目的から、カレンダーサイズプレスによる紙基材の表面処理の後に、カレンダー処理を行ってもよい。この場合、通常のカレンダー処理よりもソフトカレンダー処理を行うことが好ましい。   The paper substrate of the present invention may be subjected to a calendar treatment after the surface treatment of the paper substrate by a calendar size press for the purpose of imparting smoothness and improving the beauty. In this case, it is preferable to perform soft calendar processing rather than normal calendar processing.

本発明の熱可塑性樹脂層を積層する面の王研式平滑度を３０〜２００ｓ／１０ｍｌ、且つ坪量あたりの透気抵抗度（＝透気抵抗度／坪量）を０．２〜１．５ｓ／ｇ／ｍ２とすると、得られる断熱紙製容器用シート及びそれを用いた発泡断熱紙製容器において、断熱性と美麗性のバランスが特に良好となるため好ましい。王研式平滑度はより好ましくは５０〜１５０ｓ／１０ｍｌであり、坪量あたりの透気抵抗度はより好ましくは０．４〜１．３ｓ／ｇ／ｍ２である。 The surface on which the thermoplastic resin layer of the present invention is laminated has an Oken-type smoothness of 30 to 200 s / 10 ml and an air resistance per basis weight (= air resistance / basis weight) of 0.2 to 1. 5 s / g / m 2 is preferable because the heat insulating paper container and the foamed heat insulating paper container using the heat insulating paper container sheet obtained have a particularly good balance between heat insulating properties and beauty. The Oken smoothness is more preferably 50 to 150 s / 10 ml, and the air resistance per basis weight is more preferably 0.4 to 1.3 s / g / m 2 .

［熱可塑性樹脂層Ａ］
本発明の発泡断熱紙製容器用シートは、紙基材の少なくとも片面に熱可塑性樹脂層（以下、「熱可塑性樹脂層Ａ」とする。）を積層することを必須の構成とする。本発明では、前記紙基材に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層Ａを発泡させる。
本発明の熱可塑性樹脂層Ａに使用する熱可塑性樹脂は、積層が可能であり、且つ発泡可能であれば特に制限されず、結晶性樹脂、非結晶性樹脂のどちらの熱可塑性樹脂も使用することが可能である。
結晶性樹脂の例としては、ポリエチレン、ポリプロピレン、ポリメチルペンテン等のポリオレフィン系樹脂、ポリエステル系樹脂、ポリアミド、ポリアセタール、ＰＰＳ樹脂等が例示可能である。非結晶性樹脂の例としては、ポリスチレン、ポリ塩化ビニル、ＡＢＳ樹脂、アクリル樹脂、変性ＰＰＥ、ポリカーボネート、ポリウレタン、ポリ酢酸ビニル、非結晶性ポリエチレンテレフタレート（ＰＥＴ）等が例示可能である。これらの熱可塑性樹脂は、単一の樹脂を単層で使用しても、複数の樹脂を複層で使用しても良いが、発泡性の点から単層であることが好ましい。 [Thermoplastic resin layer A]
The foam insulated paper container sheet of the present invention has an essential structure in which a thermoplastic resin layer (hereinafter referred to as “thermoplastic resin layer A”) is laminated on at least one surface of a paper substrate. In the present invention, the moisture contained in the paper base material is evaporated by heating, and the thermoplastic resin layer A is foamed by the generated water vapor.
The thermoplastic resin used for the thermoplastic resin layer A of the present invention is not particularly limited as long as it can be laminated and can be foamed, and either a crystalline resin or an amorphous resin is used. It is possible.
Examples of the crystalline resin include polyolefin resins such as polyethylene, polypropylene, and polymethylpentene, polyester resins, polyamide, polyacetal, and PPS resins. Examples of the amorphous resin include polystyrene, polyvinyl chloride, ABS resin, acrylic resin, modified PPE, polycarbonate, polyurethane, polyvinyl acetate, and amorphous polyethylene terephthalate (PET). These thermoplastic resins may be a single resin or a plurality of resins, but are preferably a single layer from the viewpoint of foamability.

本発明の熱可塑性樹脂層Ａに使用する熱可塑性樹脂は、押出しラミネート適性及び発泡性が優れることからポリエチレンが好ましい。ポリエチレンは、大きくは直鎖状低密度ポリエチレン（密度：８８８〜９１０ｋｇ／ｍ３、融点：５５℃〜１２０℃）、低密度ポリエチレン（密度：９１０〜９２５ｋｇ／ｍ３、融点：１０５℃〜１２０℃）、中密度ポリエチレン（密度：９２５〜９４０ｋｇ／ｍ３、融点：１１５〜１３０℃）、高密度ポリエチレン（密度：９４０〜９７０ｋｇ／ｍ３、融点：１２５〜１４０℃）に区分される。本発明では、押出しラミネート適性及び発泡性が特に優れることから、低密度ポリエチレンが好ましい。 The thermoplastic resin used for the thermoplastic resin layer A of the present invention is preferably polyethylene because it is excellent in extrusion lamination suitability and foamability. Polyethylene is roughly linear low density polyethylene (density: 888 to 910 kg / m 3 , melting point: 55 ° C. to 120 ° C.), low density polyethylene (density: 910 to 925 kg / m 3 , melting point: 105 ° C. to 120 ° C. ), Medium density polyethylene (density: 925 to 940 kg / m 3 , melting point: 115 to 130 ° C.), and high density polyethylene (density: 940 to 970 kg / m 3 , melting point: 125 to 140 ° C.). In the present invention, low density polyethylene is preferred because the extrusion laminate suitability and foamability are particularly excellent.

本発明の熱可塑性樹脂層Ａの厚さは、所望する断熱性を有する発泡断熱紙製容器が得られればよく特に限定されないが、発泡前の厚さは３０〜８０μｍ程度が一般的である。   The thickness of the thermoplastic resin layer A of the present invention is not particularly limited as long as a foamed heat insulating paper container having desired heat insulation properties is obtained, but the thickness before foaming is generally about 30 to 80 μm.

［熱可塑性樹脂層Ｂ、アルミ箔］
本発明の発泡断熱紙製容器用シートは、前記紙基材の前記熱可塑性樹脂層Ａを積層した面と反対の面に、前記熱可塑性樹脂層Ａよりも融点の高い熱可塑性樹脂層（以下、「熱可塑性樹脂層Ｂ」とする。）を積層する、もしくはアルミ箔等で被覆すると、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層Ａを発泡させる際に、前記紙基材の熱可塑性樹脂層Ａを積層した面と反対の面から水蒸気が蒸散することが抑制され、発泡性が向上するため好ましい。
本発明において、前記熱可塑性樹脂層Ｂ、もしくは前記アルミ箔等は、発泡断熱紙製容器の胴部材及び／又は底板部材の内壁面側に存在すると、容器に充填した液体等が紙基材中へ浸透することを抑制することが可能であるため好ましい。 [Thermoplastic resin layer B, aluminum foil]
The sheet for a container of foamed heat insulating paper of the present invention has a thermoplastic resin layer (hereinafter referred to as a thermoplastic resin layer having a melting point higher than that of the thermoplastic resin layer A) on the surface opposite to the surface on which the thermoplastic resin layer A is laminated. , “Thermoplastic resin layer B”) is laminated or covered with aluminum foil or the like, the water contained in the paper substrate is evaporated by heating, and the thermoplastic resin layer A is foamed by the generated water vapor. In this case, it is preferable because water vapor is prevented from evaporating from the surface opposite to the surface of the paper base material on which the thermoplastic resin layer A is laminated, and foamability is improved.
In the present invention, when the thermoplastic resin layer B or the aluminum foil or the like is present on the inner wall surface side of the body member and / or the bottom plate member of the foam heat insulating paper container, the liquid filled in the container is contained in the paper base material. It is preferable because it can be prevented from penetrating into the water.

本発明の発泡断熱紙製容器用シートは、前記熱可塑性樹脂層Ａの上に前記熱可塑性樹脂層Ｂを積層してもよい。熱可塑性樹脂層Ａの上に熱可塑性樹脂層Ｂを積層すると、紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層Ａを発泡させる際に、熱可塑性樹脂層Ａを貫通して水蒸気が蒸散することが抑制され、発泡性が向上するため好ましい。特に、熱可塑性樹脂層Ａが発泡断熱紙製容器の胴部材の外壁面側に存在する場合、その表面には凹凸があり平滑ではない。熱可塑性樹脂層Ａの上に熱可塑性樹脂層Ｂを積層すると、発泡断熱紙製容器の胴部表面が平滑となり、特に美麗性に優れた発泡断熱紙製容器が得られる。   In the foam insulated paper container sheet of the present invention, the thermoplastic resin layer B may be laminated on the thermoplastic resin layer A. When the thermoplastic resin layer B is laminated on the thermoplastic resin layer A, the water contained in the paper substrate is heated and evaporated, and the thermoplastic resin layer A is foamed by the generated water vapor. It is preferable because water vapor is prevented from evaporating through A and foamability is improved. In particular, when the thermoplastic resin layer A is present on the outer wall surface side of the body member of the foam insulated paper container, the surface is uneven and not smooth. When the thermoplastic resin layer B is laminated on the thermoplastic resin layer A, the body surface of the foam heat insulating paper container becomes smooth, and a foam heat insulating paper container excellent in beauty is obtained.

本発明の熱可塑性樹脂層Ｂに使用する熱可塑性樹脂は、熱可塑性樹脂層Ａに使用する熱可塑性樹脂と同じ種類（樹種）であってもよく、異なる種類（樹種）であってもよい。同じ種類（樹種）の場合、例えば、熱可塑性樹脂層Ａに使用する熱可塑性樹脂と熱可塑性樹脂層Ｂに使用する熱可塑性樹脂の両方にポリエチレンを選択する場合、熱可塑性樹脂層Ａは前記低密度ポリエチレンを、熱可塑性樹脂層Ｂは前記中密度ポリエチレンまたは前記高密度ポリエチレンを選択することで、熱可塑性樹脂層Ｂの融点を熱可塑性樹脂層Ａより高くすることが可能となる。
前記熱可塑性樹脂層Ａと前記熱可塑性樹脂層Ｂの融点の差、即ち、熱可塑性樹脂層Ａに使用する熱可塑性樹脂と熱可塑性樹脂層Ｂに使用する熱可塑性樹脂の融点の差は５℃以上あることが好ましい。熱可塑性樹脂層Ａまたは熱可塑性樹脂層Ｂにおいて複数の樹脂を複層で使用した場合は、熱可塑性樹脂層Ａに使用した樹脂のうち最も高い融点を有する樹脂と、熱可塑性樹脂層Ｂに使用した樹脂のうち最も低い融点を有する樹脂について、融点の差が５℃以上あることが好ましい。
また、熱可塑性樹脂層Ｂに使用する熱可塑性樹脂の融点は、紙基材中に含まれる水分を加熱蒸発させる際に融解せず、水蒸気の拡散を防止できればよく特に制限されないが、１２５℃以上であると好ましい。 The thermoplastic resin used for the thermoplastic resin layer B of the present invention may be the same type (tree species) as the thermoplastic resin used for the thermoplastic resin layer A, or may be a different type (tree species). In the case of the same type (tree species), for example, when polyethylene is selected as both the thermoplastic resin used for the thermoplastic resin layer A and the thermoplastic resin used for the thermoplastic resin layer B, the thermoplastic resin layer A is the low It is possible to make the melting point of the thermoplastic resin layer B higher than that of the thermoplastic resin layer A by selecting the medium density polyethylene or the high density polyethylene for the thermoplastic resin layer B.
The difference in melting point between the thermoplastic resin layer A and the thermoplastic resin layer B, that is, the difference in melting point between the thermoplastic resin used for the thermoplastic resin layer A and the thermoplastic resin used for the thermoplastic resin layer B is 5 ° C. It is preferable that there is more. When a plurality of resins are used in the thermoplastic resin layer A or the thermoplastic resin layer B, the resin having the highest melting point among the resins used for the thermoplastic resin layer A and the thermoplastic resin layer B are used. Of the resins having the lowest melting point, the difference in melting point is preferably 5 ° C. or more.
Further, the melting point of the thermoplastic resin used for the thermoplastic resin layer B is not particularly limited as long as it does not melt when the water contained in the paper base material is evaporated by heating and can prevent the diffusion of water vapor. Is preferable.

本発明の熱可塑性樹脂層Ｂの厚さは、前記紙基材の熱可塑性樹脂層Ａを積層した面と反対の面から水蒸気が蒸散することが抑制される、もしくは熱可塑性樹脂層Ａを貫通して水蒸気が蒸散することが抑制されればよく特に限定されないが、２０〜５０μｍ程度が一般的である。特に、熱可塑性樹脂層Ｂが発泡断熱紙製容器の胴部材及び／又は底板部材の内壁面側に存在する場合、熱可塑性樹脂層Ｂの厚さが２０μｍ以上であると、容器に充填した液体等が紙基材中へ浸透することを効果的に抑制することが可能であるため好ましい。   The thickness of the thermoplastic resin layer B of the present invention is such that water vapor is prevented from evaporating from the surface opposite to the surface of the paper base material on which the thermoplastic resin layer A is laminated, or penetrates the thermoplastic resin layer A. Thus, it is not particularly limited as long as water vapor is prevented from evaporating, but about 20 to 50 μm is common. In particular, when the thermoplastic resin layer B is present on the inner wall surface side of the body member and / or the bottom plate member of the foam insulated paper container, the liquid filled in the container has a thickness of 20 μm or more. And the like can be effectively suppressed from penetrating into the paper substrate.

［熱可塑性樹脂層の積層方法］
本発明において、前記熱可塑性樹脂層Ａ及び前記熱可塑性樹脂層Ｂの積層方法は特に制限されず、紙基材上に、押出しラミネート法、ウェットラミネート法、ドライラミネート法等の各種方法を適宜使用して積層すればよいが、紙基材と熱可塑性樹脂層の密着性、及び熱可塑性樹脂層Ａの発泡性が良好となるため、押出しラミネート法が好ましい。押出しラミネート法とは、紙基材の表面に、熱可塑性樹脂をＴダイから溶融樹脂膜の状態で押出し、クーリングロールとこれに対向するニップロールとの間で冷却しつつ押圧・圧着する方法である。 [Lamination method of thermoplastic resin layer]
In the present invention, the method of laminating the thermoplastic resin layer A and the thermoplastic resin layer B is not particularly limited, and various methods such as an extrusion laminating method, a wet laminating method, and a dry laminating method are appropriately used on a paper substrate. However, since the adhesion between the paper substrate and the thermoplastic resin layer and the foamability of the thermoplastic resin layer A are improved, the extrusion laminating method is preferable. The extrusion laminating method is a method in which a thermoplastic resin is extruded from the T die in the state of a molten resin film onto the surface of a paper base, and is pressed and pressure-bonded while being cooled between a cooling roll and a nip roll facing the thermoplastic roll. .

本発明において、押出しラミネート法の操業条件、即ち、熱可塑性樹脂の溶融温度、積層速度等は、使用する熱可塑性樹脂の種類や装置により適宜設定すればよく特に制限されないが、一般に、溶融温度は２００〜３５０℃程度、積層速度は５０〜２００ｍ／分程度である。また、ニップロールとしては硬度７０度以上（ＪＩＳ Ｋ−６２５３）のものを使用し、クーリングロールとこれに対向するニップロールによる押圧・圧着は、線圧１５ｋｇｆ／ｃｍ以上で行うことが好ましい。
本発明において、前記熱可塑性樹脂層Ａ上に前記熱可塑性樹脂層Ｂを積層する場合や、熱可塑性樹脂層Ａを複数の熱可塑性樹脂層で形成する場合など、複数の熱可塑性樹脂層を積層する場合、各熱可塑性樹脂層間の密着性や生産効率の点から、複数台の押出機を用いて各熱可塑性樹脂を溶融状態でそれぞれのＴダイに導き、各Ｔダイから同時に押出して積層する、いわゆる共押出しラミネート法が好ましい。
さらに、本発明では、熱可塑性樹脂層同士の接着性を向上させるため熱可塑性樹脂層同士の間に接着性樹脂層を挟む、あるいは、紙基材と熱可塑性樹脂層の接着性を向上させるためコロナ処理、オゾン処理等を行うなどしてもよい。 In the present invention, the operating conditions of the extrusion laminating method, i.e., the melting temperature of the thermoplastic resin, the lamination speed, and the like are not particularly limited as long as they are appropriately set depending on the type and apparatus of the thermoplastic resin to be used. About 200 to 350 ° C., and the lamination speed is about 50 to 200 m / min. Further, it is preferable that a nip roll having a hardness of 70 degrees or more (JIS K-6253) is used, and the pressure and pressure bonding by the cooling roll and the nip roll facing the nip roll are performed at a linear pressure of 15 kgf / cm or more.
In the present invention, a plurality of thermoplastic resin layers are laminated such as when the thermoplastic resin layer B is laminated on the thermoplastic resin layer A, or when the thermoplastic resin layer A is formed of a plurality of thermoplastic resin layers. When doing so, from the point of adhesion between each thermoplastic resin layer and production efficiency, each thermoplastic resin is led to each T die in a molten state by using a plurality of extruders, and simultaneously extruded and laminated from each T die. The so-called coextrusion laminating method is preferred.
Furthermore, in this invention, in order to improve the adhesiveness of thermoplastic resin layers, an adhesive resin layer is pinched | interposed between thermoplastic resin layers, or in order to improve the adhesiveness of a paper base material and a thermoplastic resin layer. Corona treatment, ozone treatment, or the like may be performed.

［断熱紙製容器の成形］
本発明において、発泡断熱紙製容器用シートを用いて発泡断熱紙製容器を成形する方法は特に限定されるものではないが、一例として、一般的なカップ成形機により以下の手順で成形する方法を例示することが可能である。 [Forming insulated paper containers]
In the present invention, a method for forming a foam insulated paper container using a foam insulated paper container sheet is not particularly limited, but as an example, a method for molding by a general cup molding machine according to the following procedure Can be exemplified.

まず、発泡断熱紙製容器用シートの所定箇所に、各種絵柄やバーコード等の胴部材ブランクに必要な印刷を施した後、胴部材ブランクを打ち抜く。印刷部分の位置決めなどは常用の手段または手順により行うことができる。
次に、前記胴部材ブランクとは別に、底板部材ブランクを用意し、カップ成形機で前記胴部材ブランクと前記底板部材ブランクを組み立てて容器の形とする。底板部材ブランクは、本発明の発泡断熱紙製容器用シートを打ち抜いて用意してもよく、また、本発明の発泡断熱紙製容器用シートとは別に、容器に充填した液体等が紙基材中へ浸透することを防止するため、紙基材上に、押出しラミネート法、ウェットラミネート法、ドライラミネート法等の各種方法を適宜使用して熱可塑性樹脂を積層する、あるいはアルミ箔等で被覆してなるシートなどを打ち抜いて用意してもよい。
前記底板部材ブランクに用いる熱可塑性樹脂は、胴部材ブランクの熱可塑性樹脂層Ａに使用する熱可塑性樹脂と同じであっても異なっていてもよいが、両者を同じにする、特に本発明の発泡断熱紙製容器用シートを打ち抜いて底板部材ブランクを用意すると、胴部材の発泡と同時に底板部材も発泡するため、得られる発泡断熱紙製容器の底面の断熱性が良好となり、屋外や冬場、寒冷地で使用する場合、あるいはカップ麺など湯を注入後しばらく放置するものに使用する場合に有効である。
カップ成形機で前記胴部材ブランクと前記底板部材ブランクを組み立てて容器の形とする際に、熱可塑性樹脂層Ａは、胴部材の外側及び内側のどちらか一方あるいは両方に存在すればよく、所望する断熱性、美麗性、手触り等に応じて適宜決定すればよいが、胴部材の内側、即ち発泡断熱紙製容器の内壁面を熱可塑性樹脂層Ａとすると、飲食の際に発泡させた熱可塑性樹脂が箸やフォーク等により傷付き、口に入るおそれがあるため、胴部材の外側、即ち発泡断熱紙製容器の外壁面となるようにすることが望ましい。
同様に、底板部材についても、底板部材を発泡させる場合は、底板部材の内側、即ち発泡断熱紙製容器の内底面を発泡面とすると、飲食の際に発泡させた熱可塑性樹脂が箸やフォーク等により傷付き、口に入るおそれがあるため、底板部材の外側、即ち発泡断熱紙製容器の外底面を発泡面とすることが望ましい。 First, after printing required for the trunk member blanks such as various patterns and barcodes is applied to predetermined portions of the sheet for foamed heat insulating paper containers, the trunk member blanks are punched out. The positioning of the printed part can be performed by conventional means or procedures.
Next, separately from the body member blank, a bottom plate member blank is prepared, and the body member blank and the bottom plate member blank are assembled into a container shape by a cup forming machine. The bottom plate member blank may be prepared by punching out the foam insulation paper container sheet of the present invention. In addition to the foam insulation paper container sheet of the present invention, the liquid filled in the container is a paper substrate. In order to prevent penetration into the inside, a thermoplastic resin is laminated on the paper base material using various methods such as an extrusion lamination method, a wet lamination method, and a dry lamination method, or coated with an aluminum foil or the like. It is also possible to prepare by punching a sheet or the like.
The thermoplastic resin used for the bottom plate member blank may be the same as or different from the thermoplastic resin used for the thermoplastic resin layer A of the trunk member blank. If the bottom plate member blank is prepared by punching out the sheet for the insulated paper container, the bottom plate member is also foamed at the same time as the foaming of the body member. It is effective when used on the ground, or when used for a cup noodle or the like that is allowed to stand for a while after being poured.
When assembling the barrel member blank and the bottom plate member blank into a cup shape by a cup molding machine, the thermoplastic resin layer A only needs to exist on either or both of the outer side and the inner side of the barrel member. However, if the inner wall of the body member, that is, the inner wall surface of the foamed insulated paper container is the thermoplastic resin layer A, the heat generated during eating and drinking is determined. Since the plastic resin may be damaged by chopsticks, forks, etc. and enter the mouth, it is desirable that the plastic resin be on the outside of the body member, that is, on the outer wall surface of the foam insulated paper container.
Similarly, for the bottom plate member, when foaming the bottom plate member, if the inside surface of the bottom plate member, that is, the inner bottom surface of the foam insulated paper container is the foamed surface, the foamed thermoplastic resin is used for chopsticks and forks. Therefore, it is desirable that the outer surface of the bottom plate member, that is, the outer bottom surface of the foamed heat insulating paper container, be a foamed surface.

［加熱処理による発泡］
本発明では、前記胴部材ブランクと前記底板部材ブランクを組み立てて容器の形とした後、加熱処理により、胴部材ブランクの紙基材中に含まれる水分を加熱蒸発させ、発生させた水蒸気により熱可塑性樹脂層Ａを発泡させることにより、発泡断熱紙製容器が得られる。
本発明の加熱処理の条件、即ち加熱温度及び加熱時間は、使用する紙基材及び熱可塑性樹脂層Ａに使用する熱可塑性樹脂の種類に応じて適宜設定すればよく特に制限されないが、加熱温度は熱可塑性樹脂層Ａに使用する熱可塑性樹脂の融点よりもやや高い温度（融点＋５〜１０℃程度）が好ましく、熱可塑性樹脂層Ｂの融点より低い温度がより好ましい。一般的に、加熱温度は１００℃〜２００℃程度、加熱時間は１分間〜６分間程度である。
本発明の加熱処理において、加熱手段は特に限定されず、熱風、電熱、電子線など任意の手段を使用可能である。コンベヤによる搬送手段を備えたトンネル内で、熱風または電熱などによって加熱処理すると、本発明の発泡断熱紙製容器が安価且つ大量に得られるあるため好ましい。 [Foaming by heat treatment]
In the present invention, after the body member blank and the bottom plate member blank are assembled into a container shape, the water contained in the paper base material of the body member blank is heated and evaporated by heat treatment, and heat is generated by the generated water vapor. By foaming the plastic resin layer A, a foamed insulated paper container is obtained.
The heat treatment conditions of the present invention, that is, the heating temperature and the heating time are not particularly limited as long as they are appropriately set according to the type of the thermoplastic resin used for the paper base material and the thermoplastic resin layer A to be used. Is preferably a temperature slightly higher than the melting point of the thermoplastic resin used for the thermoplastic resin layer A (melting point + about 5 to 10 ° C.), more preferably a temperature lower than the melting point of the thermoplastic resin layer B. Generally, the heating temperature is about 100 ° C. to 200 ° C., and the heating time is about 1 minute to 6 minutes.
In the heat treatment of the present invention, the heating means is not particularly limited, and any means such as hot air, electric heat, or electron beam can be used. Heat treatment with hot air or electric heat in a tunnel equipped with a conveyor means is preferable because the foamed insulated paper container of the present invention can be obtained in a low cost and in large quantities.

［その他］
本発明では、必要に応じて、所望の効果を損なわない範囲で紙製容器の分野で公知の技術を適用することができる。例えば、胴部材の外側の一部に合成樹脂成分を５〜４０ｗｔ％含有する塗料を塗布し、部分的に発泡を抑制する技術（特許第３０１４６２９号公報）、胴部材の外側、即ち発泡断熱紙製容器の外壁面に発泡と同調して滑らかな印刷面を形成する同調インキを塗布する技術（特許第３４０８１５６号公報）、胴部材の開口上縁に断面角型に強制加工した上部フランジ部を設け、その内側巻き込み端をフランジ部の上部に重合させて二重構造にする技術（特開２００１−３５４２２６号公報）等が挙げられるが、これらに制限されるものではない。また、美麗性を高めるために、発泡断熱紙製容器の外壁面となる胴部材の最表層に、顔料とバインダーを主成分とするインキ受理層を設けてもよい。
また、本発明の発泡断熱紙製容器に使用する蓋材については、前記底板部材ブランクと同様に、容器に充填した液体等が紙基材中へ浸透することを防止するため、紙基材上に、押出しラミネート法、ウェットラミネート法、ドライラミネート法等の各種方法を適宜使用して熱可塑性樹脂を積層する、あるいはアルミ箔等で被覆してなるシートなどを打ち抜いて用意してもよい。 [Others]
In the present invention, if necessary, a technique known in the field of paper containers can be applied as long as a desired effect is not impaired. For example, a technique (Patent No. 3014629) for partially suppressing foaming by applying a paint containing 5 to 40 wt% of a synthetic resin component on a part of the outer side of the body member, and the foamed heat insulating paper A technique (Patent No. 3408156) for applying synchronous ink that forms a smooth printing surface in synchronism with foaming on the outer wall surface of the container, and an upper flange portion forcedly processed into a square cross section on the upper edge of the opening of the body member A technique (Japanese Patent Laid-Open No. 2001-354226) or the like that provides a double structure by superposing the inner winding end on the upper portion of the flange portion is not limited thereto. Further, in order to enhance the beauty, an ink receiving layer mainly composed of a pigment and a binder may be provided on the outermost layer of the body member serving as the outer wall surface of the foamed insulated paper container.
Moreover, about the cover material used for the foam insulated paper container of this invention, in order to prevent that the liquid etc. which were filled into the container osmose | permeated into a paper base material like the said baseplate member blank, on a paper base material. In addition, a sheet formed by laminating a thermoplastic resin by using various methods such as an extrusion laminating method, a wet laminating method, and a dry laminating method, or covering with an aluminum foil or the like may be prepared.

以下、実施例により本発明の効果を詳細に説明する。なお、特にことわらない限り、部及び％は重量部および重量％を示す。各パルプのカナダ標準ろ水度（Ｃ．Ｓ．Ｆ．）はＪＩＳ Ｐ８１２１に準じて測定した。
［実施例１］
［紙基材］
パルプ濃度が２０重量％で高濃度叩解したＬＢＫＰ１９部（ＣＳＦ１８０ｍｌ）とパルプ濃度が４重量％で通常に叩解したＬＢＫＰ８１部（ＣＳＦ４８０ｍｌ）からなるパルプ１００部に対して、硫酸アルミニウム２．５部、ロジンサイズ剤０．５部を添加した紙料スラリーを長網抄紙機で抄紙して原紙を得た。次いで、得られた原紙の両面に、カレンダーサイズプレスによりポリビニルアルコール（完全ケン化ポリビニルアルコール、クラレ社製、製品名：ＰＶＡ１１７）を片面当たり固形分で０．２ｇ／ｍ２（両面で０．４ｇ／ｍ２）になるように塗工、乾燥し、坪量３２０ｇ／ｍ２、密度０．８８ｇ／ｃｍ３、水分量２３．４ｇ／ｍ２の紙基材を得た。得られた紙基材の熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は６１ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．８８ｓ／ｇ／ｍ２であった。
［発泡断熱紙製容器用シート］
上記で得られた紙基材の熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面に、厚さ７０μｍとなるように熱可塑性樹脂（（低密度ポリエチレン、密度９１８ｋｇ／ｍ３、融点１０８℃））を溶融温度３３０℃、積層速度５０ｍ／分で押出し、クーリングロールとニップロール（硬度７０度）を用いて、線圧１５ｋｇｆ／ｃｍで押圧・圧着し、熱可塑性樹脂層Ａを積層した。
次いで、紙基材の熱可塑性樹脂層Ａを積層した面と反対の面に、厚さ４０μｍとなるように熱可塑性樹脂（（中密度ポリエチレン、密度９３９ｋｇ／ｍ３、融点１２８℃））を溶融温度３３０℃、積層速度５０ｍ／分で押出し、クーリングロールとニップロール（硬度７０度）を用いて、線圧１５ｋｇｆ／ｃｍで押圧・圧着し、熱可塑性樹脂層Ｂを積層して、発泡断熱紙製容器用シートを得た。 Hereinafter, the effects of the present invention will be described in detail by way of examples. Unless otherwise specified, parts and% indicate parts by weight and% by weight. The Canadian standard freeness (CSF) of each pulp was measured according to JIS P8121.
[Example 1]
[Paper base]
2.5 parts of aluminum sulfate, rosin for 100 parts of pulp consisting of 19 parts of LBKP (CSF 180 ml) beaten at a high concentration at a pulp concentration of 20 wt% and 81 parts of LBKP (CSF 480 ml) usually beaten at a pulp concentration of 4 wt% The stock slurry to which 0.5 part of the sizing agent was added was made with a long paper machine to obtain a base paper. Next, polyvinyl alcohol (fully saponified polyvinyl alcohol, manufactured by Kuraray Co., Ltd., product name: PVA117) was added to both sides of the obtained base paper by a calendar size press at a solid content of 0.2 g / m 2 (0.4 g on both sides). / m 2) to become as coating, drying, basis weight 320 g / m 2, a density 0.88 g / cm 3, to obtain a paper substrate of moisture content 23.4 g / m 2. The surface of the obtained paper substrate on which the thermoplastic resin layer (thermoplastic resin layer A) is laminated is 61 s / 10 ml and the air resistance per basis weight is 0.88 s / g / m 2. Met.
[Foam insulation paper container sheet]
A thermoplastic resin ((low density polyethylene, density 918 kg / m 3 , melting point 108) is formed on the surface of the paper substrate obtained by laminating the thermoplastic resin layer (thermoplastic resin layer A) to a thickness of 70 μm. ° C)) was extruded at a melting temperature of 330 ° C and a lamination speed of 50 m / min, and pressed and pressure-bonded at a linear pressure of 15 kgf / cm using a cooling roll and a nip roll (hardness of 70 degrees) to laminate the thermoplastic resin layer A.
Next, a thermoplastic resin ((medium density polyethylene, density 939 kg / m 3 , melting point 128 ° C.)) is melted on the surface opposite to the surface on which the thermoplastic resin layer A of the paper base material is laminated to a thickness of 40 μm. Extruded at a temperature of 330 ° C. and a lamination speed of 50 m / min, pressed and pressure-bonded at a linear pressure of 15 kgf / cm using a cooling roll and a nip roll (hardness of 70 degrees), laminated with a thermoplastic resin layer B, and made of foam insulation paper A container sheet was obtained.

［実施例２］
パルプ配合を、パルプ濃度が２０重量％で高濃度叩解したＣＳＦ１８０ｍｌのＬＢＫＰ２５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ７５部とした以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．９０ｇ／ｃｍ３、水分量２４．６ｇ／ｍ２、熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は８５ｓ／１０ｍｌ、坪量あたりの透気抵抗度は１．０９ｓ／ｇ／ｍ２であった。
［実施例３］
パルプ配合を、パルプ濃度が２０重量％で高濃度叩解したＣＳＦ１８０ｍｌのＬＢＫＰ３５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ６５部とした以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．９１ｇ／ｃｍ３、水分量２５．３ｇ／ｍ２、熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は１２０ｓ／１０ｍｌ、坪量あたりの透気抵抗度は１．３１ｓ／ｇ／ｍ２であった。
［比較例３］
パルプ配合を、パルプ濃度が２０重量％で高濃度叩解したＣＳＦ１８０ｍｌのＬＢＫＰ４５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ５５部とした以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．９１ｇ／ｃｍ３、水分量２５．６ｇ／ｍ２、熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は１６２ｓ／１０ｍｌ、坪量あたりの透気抵抗度は１．４４ｓ／ｇ／ｍ２であった。
［実施例４］
パルプ配合を、パルプ濃度が３５重量％で高濃度叩解したＣＳＦ２００ｍｌのＬＢＫＰ２５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ７５部とした以外は、実施例２と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．９２ｇ／ｃｍ３、水分量２５．６ｇ／ｍ２、熱可塑性樹脂層を積層する面の王研式平滑度は５８ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．９４ｓ／ｇ／ｍ２であった。
［実施例５］
得られた原紙の両面に、２ロールサイズプレスによりポリビニルアルコール（完全ケン化ポリビニルアルコール、クラレ社製、製品名：ＰＶＡ１１７）を片面当たり固形分で０．２ｇ／ｍ２（両面で０．４ｇ／ｍ２）になるように塗工、乾燥し、さらに原紙の両面に、カレンダーサイズプレスにより水を塗工、乾燥した以外は、実施例２と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．８９ｇ／ｃｍ３、水分量２３．４ｇ／ｍ２、熱可塑性樹脂層を積層する面の王研式平滑度は９３ｓ／１０ｍｌ、坪量あたりの透気抵抗度は１．００ｓ／ｇ／ｍ２であった。
［実施例６］
紙基材を坪量２７０ｇ／ｍ２とした以外は、実施例２と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量２７０ｇ／ｍ２、密度０．９１ｇ／ｃｍ３、水分量２０．８ｇ／ｍ２、熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は７５ｓ／１０ｍｌ、坪量あたりの透気抵抗度は１．０７ｓ／ｇ／ｍ２であった。
［比較例４］
パルプ配合を、パルプ濃度が２０重量％で高濃度叩解したＣＳＦ１８０ｍｌのＬＢＫＰ１５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ６５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ６００ｍｌのＮＢＫＰ２０部とした以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．９０ｇ／ｃｍ３、水分量２４．３ｇ／ｍ２、熱可塑性樹脂層（熱可塑性
樹脂層Ａ）を積層する面の王研式平滑度は５１ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．４８ｓ／ｇ／ｍ２であった。
［比較例５］
パルプ配合を、パルプ濃度が２０重量％で高濃度叩解したＣＳＦ１８０ｍｌのＬＢＫＰ１０部とパルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ９０部とした以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．８８ｇ／ｃｍ３、水分量２２．４ｇ／ｍ２、熱可塑性樹脂層
（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は５５ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．７８ｓ／ｇ／ｍ２であった。
［比較例６］
カレンダーサイズプレスによりポリビニルアルコール（完全ケン化ポリビニルアルコール、クラレ社製、製品名：ＰＶＡ１１７）を片面当たり固形分で０．５ｇ／ｍ２（両面で１．０ｇ／ｍ２）になるように塗工、乾燥した以外は、実施例９と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．８７ｇ／ｃｍ３、水分量２２．４ｇ／ｍ２、熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は６０ｓ／１０ｍｌ、坪量あたりの透気抵抗度は１．３４ｓ／ｇ／ｍ２であった。
［比較例７］
パルプ配合を、パルプ濃度が４重量％で通常に叩解したＣＳＦ４８０ｍｌのＬＢＫＰ８５部とパルプ濃度が４重量％で通常に叩解したＣＳＦ６００ｍｌのＮＢＫＰ１５部とした以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．８８ｇ／ｃｍ３、水分量２３．７ｇ／ｍ２、熱可塑性樹脂層（熱可塑性樹脂層Ａ）を積層する面の王研式平滑度は５６ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．６９ｓ／ｇ／ｍ２であった。
[Example 2]
Insulated foamed paper in the same manner as in Example 1 except that the pulp composition was 25 parts of LBKP 180 ml of CSF beaten at a high concentration of 20 wt% and 75 parts of LBKP 480 ml of beef beaten normally at a pulp concentration of 4 wt%. A container-made sheet was obtained. The obtained paper substrate has a basis weight of 320 g / m 2 , a density of 0.90 g / cm 3 , a moisture content of 24.6 g / m 2 , and a surface on which a thermoplastic resin layer (thermoplastic resin layer A) is laminated. The smoothness was 85 s / 10 ml, and the air resistance per basis weight was 1.09 s / g / m 2 .
[Example 3]
Insulated foamed paper in the same manner as in Example 1 except that 35 parts of CSF 180 ml LBKP beaten at a high concentration of 20% by weight and 35 parts of LBKP 480 ml beaten at a normal pulp concentration of 4% by weight were used. A container-made sheet was obtained. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.91 g / cm 3, water content 25.3 g / m 2, the surface of the laminated thermoplastic resin layer (thermoplastic resin layer A) Oken type The smoothness was 120 s / 10 ml, and the air resistance per basis weight was 1.31 s / g / m 2 .
[ Comparative Example 3 ]
Insulated foam paper in the same manner as in Example 1 except that the pulp composition was changed to 45 parts of LBKP 180 ml of CSF beaten at a high concentration of 20% by weight and 55 parts of LBKP 480 ml beaten up to a normal concentration of 4% by weight of pulp. A container-made sheet was obtained. The obtained paper substrate has a basis weight of 320 g / m 2 , a density of 0.91 g / cm 3 , a moisture content of 25.6 g / m 2 , and a surface on which a thermoplastic resin layer (thermoplastic resin layer A) is laminated. The smoothness was 162 s / 10 ml, and the air resistance per basis weight was 1.44 s / g / m 2 .
[Example 4 ]
Insulated foam paper in the same manner as in Example 2 except that the pulp composition was 35 parts by weight of CSF 200 ml LBKP beaten at a high concentration of 35% by weight, and 75 parts by weight of 480 ml of CSF usually beaten at a pulp concentration of 4% by weight. A container-made sheet was obtained. The obtained paper base has a basis weight of 320 g / m 2 , a density of 0.92 g / cm 3 , a moisture content of 25.6 g / m 2 , and a surface of the thermoplastic resin layer on which the Oken smoothness is 58 s / 10 ml, The air resistance per basis weight was 0.94 s / g / m 2 .
[Example 5 ]
Polyvinyl alcohol (fully saponified polyvinyl alcohol, manufactured by Kuraray Co., Ltd., product name: PVA117) was 0.2 g / m 2 on one side of the obtained base paper by a 2-roll size press (0.4 g / m 2 on both sides). m 2 ) A foamed insulated paper container sheet was obtained in the same manner as in Example 2 except that water was applied to both sides of the base paper by a calendar size press and dried. . The resulting paper substrate having a basis weight 320 g / m 2, a density 0.89 g / cm 3, water content 23.4 g / m 2, Oken type smoothness of the surface of laminating the thermoplastic resin layer 93s / 10 ml, The air resistance per basis weight was 1.00 s / g / m 2 .
[Example 6 ]
A foam insulated paper container sheet was obtained in the same manner as in Example 2 except that the basis weight of the paper substrate was 270 g / m 2 . The obtained paper substrate has a basis weight of 270 g / m 2 , a density of 0.91 g / cm 3 , a moisture content of 20.8 g / m 2 , and a surface on which a thermoplastic resin layer (thermoplastic resin layer A) is laminated. The smoothness was 75 s / 10 ml, and the air resistance per basis weight was 1.07 s / g / m 2 .
[ Comparative Example 4 ]
15 parts of LBKP with 180 ml of CSF beaten at a high concentration at a pulp concentration of 20 wt% and 65 parts of LBKP at 480 ml of a normal beat at a pulp concentration of 4 wt%, and 600 ml of NBKP20 at a pulp concentration of 4 wt% for a CSF 600 ml A foamed insulated paper container sheet was obtained in the same manner as in Example 1 except that the parts were used. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.90 g / cm 3, water content 24.3 g / m 2, the surface of the laminated thermoplastic resin layer (thermoplastic resin layer A) Oken type The smoothness was 51 s / 10 ml, and the air resistance per basis weight was 0.48 s / g / m 2 .
[ Comparative Example 5 ]
Insulated foamed paper in the same manner as in Example 1, except that 10 parts of CSF 180 ml of LBKP beaten at a high concentration at a pulp concentration of 20% by weight and 90 parts of LBKP of 480 ml of CSF usually beaten at a pulp concentration of 4% by weight were used. A container-made sheet was obtained. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.88 g / cm 3, water content 22.4 g / m 2, the surface of the laminated thermoplastic resin layer (thermoplastic resin layer A) Oken type The smoothness was 55 s / 10 ml, and the air resistance per basis weight was 0.78 s / g / m 2 .
[ Comparative Example 6 ]
Coating with polyvinyl alcohol (fully saponified polyvinyl alcohol, product name: PVA117) by a calendar size press so that the solid content per side is 0.5 g / m 2 (1.0 g / m 2 on both sides). Except for drying, a foam insulated paper container sheet was obtained in the same manner as in Example 9. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.87 g / cm 3, water content 22.4 g / m 2, the surface of the laminated thermoplastic resin layer (thermoplastic resin layer A) Oken type The smoothness was 60 s / 10 ml, and the air resistance per basis weight was 1.34 s / g / m 2 .
[ Comparative Example 7 ]
Foam insulation paper in the same manner as in Example 1 except that the pulp composition was 85 parts of BK ml of CSF normally beaten at a pulp concentration of 4% by weight and 15 parts of NBKP of 600 ml of CSF normally beaten at a pulp concentration of 4% by weight. A container-made sheet was obtained. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.88 g / cm 3, water content 23.7 g / m 2, the surface of the laminated thermoplastic resin layer (thermoplastic resin layer A) Oken type The smoothness was 56 s / 10 ml, and the air resistance per basis weight was 0.69 s / g / m 2 .

［比較例１］
カレンダーサイズプレスを２ロールサイズプレスに変更した以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．８６ｇ／ｃｍ３、水分量２１．１ｇ／ｍ２、熱可塑性樹脂層を積層する面の王研式平滑度は２５ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．２３ｓ／ｇ／ｍ２であった。
［比較例２］
カレンダーサイズプレスを２ロールサイズプレスに変更し、ポリビニルアルコール（完全ケン化ポリビニルアルコール、クラレ社製、製品名：ＰＶＡ１１７）を片面当たり固形分で０．５ｇ／ｍ２（両面で１．０ｇ／ｍ２）になるように塗工、乾燥した以外は、実施例１と同様にして発泡断熱紙製容器用シートを得た。得られた紙基材は坪量３２０ｇ／ｍ２、密度０．８５ｇ／ｃｍ３、水分量２１．１ｇ／ｍ２、熱可塑性樹脂層を積層する面の王研式平滑度は５８ｓ／１０ｍｌ、坪量あたりの透気抵抗度は０．６５ｓ／ｇ／ｍ２であった。 [Comparative Example 1]
A foam insulated paper container sheet was obtained in the same manner as in Example 1 except that the calendar size press was changed to the 2-roll size press. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.86 g / cm 3, water content 21.1 g / m 2, Oken type smoothness of the surface of laminating the thermoplastic resin layer 25s / 10 ml, The air resistance per basis weight was 0.23 s / g / m 2 .
[Comparative Example 2]
The calendar size press was changed to a two-roll size press, and polyvinyl alcohol (fully saponified polyvinyl alcohol, manufactured by Kuraray Co., Ltd., product name: PVA117) was 0.5 g / m 2 in terms of solid content per side (1.0 g / m on both sides). 2 ) A foam insulated paper container sheet was obtained in the same manner as in Example 1 except that coating and drying were performed. The resulting paper substrate having a basis weight 320 g / m 2, a density 0.85 g / cm 3, water content 21.1 g / m 2, Oken type smoothness of the surface of laminating the thermoplastic resin layer 58s / 10 ml, The air resistance per basis weight was 0.65 s / g / m 2 .

以上のようにして得た発泡断熱紙製容器用シートについて以下の評価を行った。
［成形加工適性］
得られた発泡断熱紙製容器用シートについて、金属ロール／金属ロールからなるニップ装置を用いて下記条件で加圧処理を行い、成形加工適性を評価した。
・試験片形状：１辺１００ｍｍの正方形
・処理速度：５０ｍ／分
・処理圧力：５０ｋＮ／ｍ
試験片の曲げ方向：紙基材の抄紙方向（ＭＤ方向）を軸として、熱可塑性樹脂層
（熱可塑性樹脂層Ａ）が外面となるように曲げる
ニップ通過方向：試験片の曲げ方向と直交（紙基材の抄紙横方向（ＣＤ方向）と同じ）

成形加工適性は、加圧処理後の熱可塑性樹脂層（熱可塑性樹脂層Ａ）の破壊を目視で観察し、以下の基準で評価した。
○：熱可塑性樹脂層（熱可塑性樹脂層Ａ）の破壊が認められない。
×：熱可塑性樹脂層（熱可塑性樹脂層Ａ）の破壊が認められる。 The following evaluation was performed about the sheet | seat for foam insulated paper containers obtained as mentioned above.
[Formability]
About the obtained sheet | seat for foam insulated paper containers, the pressurization process was performed on the following conditions using the nip apparatus which consists of a metal roll / metal roll, and the molding process aptitude was evaluated.
-Test piece shape: Square with a side of 100 mm-Processing speed: 50 m / min-Processing pressure: 50 kN / m
Bending direction of test piece: Thermoplastic resin layer with paper making direction (MD direction) of paper base as axis
Bending so that (thermoplastic resin layer A) is the outer surface Nip passing direction: orthogonal to the bending direction of the test piece (same as the papermaking lateral direction (CD direction) of the paper base)

The moldability was evaluated based on the following criteria by visually observing the destruction of the thermoplastic resin layer (thermoplastic resin layer A) after the pressure treatment.
◯: Destruction of the thermoplastic resin layer (thermoplastic resin layer A) is not observed.
X: Destruction of the thermoplastic resin layer (thermoplastic resin layer A) is observed.

［断熱性］
得られた発泡断熱紙製容器用シートから、高さ１１５ｍｍ、幅３００ｍｍの胴部材ブランク、直径９５ｍｍの円形の底板部材ブランク、及び直径１００ｍｍの円形の蓋材をそれぞれ切り出した。次に、胴部材ブランクを熱可塑性樹脂層Ａが外側となるように円筒形とし、底板部材ブランクを熱可塑性樹脂層Ａが外側となるように接着して、円筒形容器を作製した。次に、熱風を使用して、加熱温度１１５℃、加熱時間６分間で円筒形容器の熱可塑性樹脂層Ａを発泡させ、円筒形の発泡断熱紙製容器を得た。
得られた発泡断熱紙製容器用に５５０ｍｌの沸騰した湯を注入し、熱可塑性樹脂層Ａが外側となるように蓋材で蓋をして、３分後に発泡断熱紙製容器の胴部を手で持ち、以下の基準で評価した。
○：問題なく持てる。
△：やや熱く感じるが、持てない程度ではない。
×：熱くて持てない。 [Thermal insulation properties]
From the obtained foam insulation paper container sheet, a body member blank having a height of 115 mm, a width of 300 mm, a circular bottom plate member blank having a diameter of 95 mm, and a circular lid member having a diameter of 100 mm were cut out. Next, the barrel member blank was made cylindrical so that the thermoplastic resin layer A was on the outside, and the bottom plate member blank was bonded so that the thermoplastic resin layer A was on the outside, thereby producing a cylindrical container. Next, by using hot air, the thermoplastic resin layer A of the cylindrical container was foamed at a heating temperature of 115 ° C. and a heating time of 6 minutes to obtain a cylindrical foam insulated paper container.
550 ml of boiling hot water is poured into the obtained foam insulated paper container, and the lid is covered with the lid so that the thermoplastic resin layer A is on the outside, and after 3 minutes, the trunk of the foam insulated paper container is removed. Hold by hand and evaluated according to the following criteria.
○: Can be held without problems.
Δ: It feels a little hot, but it is not to the extent that it cannot be held.
X: It is hot and cannot be held.

［美麗性］
得られた発泡断熱紙製容器用シートから１辺１００ｍｍの正方形の試験片を切り出し、熱風を使用して、加熱温度１１５℃、加熱時間６分間で熱可塑性樹脂層Ａを発泡させた。
発泡後の熱可塑性樹脂層Ａの表面を目視で観察し、以下の基準で美麗性を評価した。
◎：過発泡が見られず、形成された発泡セルは小さく均質であり、表面は概ね平坦である。
○：過発泡が見られず、形成された発泡セルは小さく表面も概ね平坦であるが、発泡セル
の大きさにバラツキが見られる。
△：形成された発泡セルがやや大きく、大きさにバラツキも見られるが、表面の凹凸は
小さく過発泡は見られない。
×：過発泡が発生しているなど、表面に大きな凹凸がある。 [Beauty]
A square test piece having a side of 100 mm was cut out from the obtained foam insulation paper container sheet, and the thermoplastic resin layer A was foamed using hot air at a heating temperature of 115 ° C. for a heating time of 6 minutes.
The surface of the thermoplastic resin layer A after foaming was visually observed, and the beauty was evaluated according to the following criteria.
A: No excessive foaming is observed, the formed foam cells are small and homogeneous, and the surface is generally flat.
○: No over-foaming was observed, and the formed foamed cells were small and the surface was almost flat, but there was variation in the size of the foamed cells.
(Triangle | delta): Although the formed foam cell is a little large and the size varies, the unevenness | corrugation of the surface is small and no overfoaming is seen.
X: There are large irregularities on the surface such as excessive foaming.

Figure 0005903972
Figure 0005903972

Claims (3)

紙基材の少なくとも片面に熱可塑性樹脂層を積層した発泡断熱紙製容器用シートの製造方法において、該紙基材の表面がカレンダーサイズプレスによって処理を施された前記紙基材の熱可塑性樹脂層を積層する面の王研式平滑度が５８〜１２０ｓ／１０ｍｌ、且つ坪量あたりの透気抵抗度が０．８８〜１．３１ｓ／ｇ／ｍ２であることを特徴とする発泡断熱紙製容器用シートの製造方法。 In the method for producing a foam insulated paper container sheet in which a thermoplastic resin layer is laminated on at least one surface of a paper base material, the paper base material is processed by a calendar size press on the surface of the paper base material. Foam heat insulating paper characterized in that the Oken-type smoothness of the surface on which the layers are laminated is 58 to 120 s / 10 ml and the air resistance per basis weight is 0.88 to 1.31 s / g / m 2. A method for producing a container-made sheet. 前記紙基材の熱可塑性樹脂層を積層する面の王研式平滑度が６１〜８５ｓ／１０ｍｌ、且
つ坪量あたりの透気抵抗度が０．８８〜１．０９ｓ／ｇ／ｍ２であることを特徴とする請
求項１に記載の発泡断熱紙製容器用シートの製造方法。 The surface of the paper base material on which the thermoplastic resin layer is laminated has a Oken smoothness of 61 to 85 s / 10 ml, and an air resistance per basis weight of 0.88 to 1.09 s / g / m 2 . The manufacturing method of the sheet | seat for foam insulated paper containers of Claim 1 characterized by the above-mentioned. 請求項１又は請求項２に記載の製造方法で製造した発泡断熱紙製容器用シートを胴部材及び／又は底板部材に用いることを特徴とするとともに、前記発泡断熱紙製容器用シートの前記紙基材が含有する水分を加熱蒸発させ、前記熱可塑性樹脂層を発泡させて得られることを特徴とする発泡断熱紙製容器の製造方法。 A sheet for a foam insulated paper container made by the production method according to claim 1 or 2 is used for a body member and / or a bottom plate member, and the paper for the foam insulated paper container sheet A method for producing a foamed insulated paper container , which is obtained by heating and evaporating moisture contained in a substrate and foaming the thermoplastic resin layer.
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