JP2014167192A - Base paper for molded vessel - Google Patents
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- JP2014167192A JP2014167192A JP2013039595A JP2013039595A JP2014167192A JP 2014167192 A JP2014167192 A JP 2014167192A JP 2013039595 A JP2013039595 A JP 2013039595A JP 2013039595 A JP2013039595 A JP 2013039595A JP 2014167192 A JP2014167192 A JP 2014167192A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
Description
本発明は、食肉、野菜、鮮魚等の生鮮食料品などの各種加工食品等を収容するのに用いられる紙製トレー等の成形容器に適した成形容器用原紙、及び成形容器に関する。 The present invention relates to a base paper for a molded container suitable for a molded container such as a paper tray used to store various processed foods such as fresh food such as meat, vegetables and fresh fish, and a molded container.
従来、食品容器等の包装材料として、プラスチック製容器が大量に使用されてきた。これらのプラスチック製容器としては、例えば、発泡ポリスチレンビーズをモウルド成形または発泡ポリスチレンシートをプレス成形して得た発泡スチロール容器、またポリプロピレン容器等が広く用いられている。しかしながら、プラスチック製容器は、廃棄処分時の環境に対する負荷が高いという問題があった。即ち、埋め立て処理をすると半永久的に分解されず地中に残存する等の問題があった。 Conventionally, plastic containers have been used in large quantities as packaging materials for food containers and the like. As these plastic containers, for example, expanded polystyrene containers obtained by molding molded polystyrene beads or press-molding expanded polystyrene sheets, polypropylene containers, and the like are widely used. However, the plastic container has a problem that the burden on the environment at the time of disposal is high. That is, there is a problem that when the landfill process is performed, it is not decomposed semipermanently and remains in the ground.
近年、環境問題、リサイクル問題、省資源を考慮し、前述のプラスチック製容器に代わるものとして、リサイクルが可能で、廃棄された場合の燃焼カロリーも低く、生分解性能を有し、環境に対する負荷の低い天然パルプ（以下パルプという）を素材とする容器が求められていた。 In recent years, considering environmental issues, recycling issues, and resource saving, it can be recycled as an alternative to the aforementioned plastic containers, has low combustion calories when discarded, has biodegradability, and has a low environmental impact. There has been a demand for containers made of low natural pulp (hereinafter referred to as pulp).
パルプを素材とするトレー成形体としては、従来からパルプモウルド容器が存在するが生産性、耐水性、加工性等に問題があった。 Conventionally, there is a pulp mold container as a tray molded body made of pulp, but there are problems in productivity, water resistance, processability, and the like.
パルプモウルド以外で、パルプを主体した成形品を得る方法として、多層抄きされた板紙等のパルプを主体とした基材シートを加熱下でプレス成形する方法が知られている。この方法は、雌雄型の間に予め罫線を入れた基材シートを装填し、熱圧でプレス成形したものである。このようなプレス成形法は、１回のプレスで成形体が得られるため、生産性が非常に高いが、樹脂と異なり、紙パルプを主体とする基材シートは延伸性、延展性、伸縮性に乏しい。従って、ある程度の深さを持つトレーを成形しようとして深絞りプレス成形を行うと、基材シートがその延伸に耐えられず破断や割れが生ずる恐れがある。 As a method for obtaining a molded product mainly composed of pulp other than the pulp mold, a method is known in which a base sheet mainly composed of pulp such as multi-ply paperboard is press-molded under heating. This method is a method in which a base sheet with a ruled line is placed between a male and female mold and press-molded with hot pressure. Such a press molding method is very productive because a molded body can be obtained by a single press, but unlike a resin, a base sheet mainly composed of paper pulp is stretchable, stretchable, and stretchable. It is scarce. Therefore, when deep drawing press molding is performed in order to mold a tray having a certain depth, the base sheet cannot withstand the stretching, and there is a risk of breakage or cracking.
上記課題を解決するために、紙製の成形容器用原紙に関する発明が開示されている。 In order to solve the above problems, an invention related to a paper-made base paper for forming containers is disclosed.
特許文献１及び２は紙製トレー用紙の絞り成形を含むプレス成形加工時の折シワ・罫線割れ等を改善するために、多層抄き板紙原紙の坪量と各層の密度及び原料配合を規定している。 Patent Documents 1 and 2 stipulate the basis weight of multilayer paperboard base paper, the density of each layer, and the raw material composition in order to improve folding wrinkles, ruled line cracks, etc. during press forming including drawing of paper tray paper ing.
しかしながら、特許文献１及び２の方法は、坪量と各層の密度及び原料配合を調整する必要があり、操業条件の調整が難しい。一方で、原紙の表面に塗工液を塗工して、滑り性などプレス成形加工に適した表面性などを付与する方法が考えられる。本発明は、プレス成形加工に適した表面性を有し、紙製の成形容器用原紙の深絞り加工を含むプレス成形加工時に発生する破断・割れを改善することを課題とする。 However, in the methods of Patent Documents 1 and 2, it is necessary to adjust the basis weight, the density of each layer, and the raw material composition, and it is difficult to adjust the operation conditions. On the other hand, a method is conceivable in which a coating liquid is applied to the surface of the base paper to impart surface properties suitable for press molding such as slipperiness. It is an object of the present invention to improve the breaking and cracking that occurs during press molding including deep drawing of paper base paper for molding containers, having surface properties suitable for press molding.
上記課題を解決するための請求項１に記載の発明は、２層以上から成る多層抄きされた成形容器用原紙において、表層と裏層の表面に澱粉とアルキルケテンダイマー（以下ＡＫＤという）の混合液を塗工した成形容器用原紙である。 The invention according to claim 1 for solving the above-mentioned problems is that, in the base paper for forming containers formed of multilayers composed of two or more layers, starch and alkyl ketene dimer (hereinafter referred to as AKD) are formed on the surface of the front layer and the back layer. It is a base paper for forming containers coated with a mixed solution.
一実施形態においては、表層と裏層に澱粉を固形分付着量として合計で０．５０〜２．００ｇ／ｍ２、ＡＫＤを固形分付着量として合計で０．０１８〜０．１００ｇ／ｍ２になるように塗工した成形容器用原紙である。 In one embodiment, the surface layer and 0.018~0.100g / m 2 in total starch in the back layer in the total solid content adhesion quantity of 0.50~2.00g / m 2, AKD solid content adhesion quantity It is the base paper for forming containers coated so as to become.
また、一実施形態においては、ＪＩＳＰ−８１４７：２０１０により測定した動摩擦係数が０．３０〜０．５０である成形容器用原紙である。 Moreover, in one Embodiment, it is the base paper for shaping | molding containers whose dynamic friction coefficient measured by JISP-8147: 2010 is 0.30-0.50.
また、一実施形態においては、断面水浸透度が０．２〜０．７ｍｍである成形容器用原紙である Moreover, in one Embodiment, it is the base paper for shaping | molding containers whose cross-section water permeability is 0.2-0.7 mm.
また、一実施形態においてはＪＩＳ−Ｐ８１５５：２０１０により測定した表面と裏面の平滑度が２０〜７０秒である成形容器用原紙である。 Moreover, in one Embodiment, it is the base paper for shaping | molding containers whose smoothness of the surface and back surface measured by JIS-P8155: 2010 is 20 to 70 seconds.
また、一実施形態においてはＪＩＳ−Ｐ８１２５により測定した縦方向のこわさが９．０ｍＮ・ｍ以上で横方向のこわさが４．０ｍＮ・ｍ以上である成形容器用原紙である。 In addition, in one embodiment, the base paper for molded containers has a longitudinal stiffness measured by JIS-P8125 of 9.0 mN · m or more and a lateral stiffness of 4.0 mN · m or more.
また、一実施形態においてはＪＡＰＡＮ ＴＡＰＰＩ Ｎｏ１９−２：２０００により測定したすき合わせ層のはくり強さが７０Ｎ／ｍ以上の成形容器用原紙である。 Moreover, in one Embodiment, it is the base paper for shaping | molding containers whose peeling strength of the bonding layer measured by JAPAN TAPPI No19-2: 2000 is 70 N / m or more.
本発明は上記のとおりであって、２層以上の複数層からなる多層抄きされた成形容器用原紙の表層と裏層の表面に澱粉とＡＫＤの混合液を塗布することで、深絞り加工を含むプレス成形加工時の成形容器用原紙の破断や割れが改善される。 The present invention is as described above, and a deep drawing process is performed by applying a mixture of starch and AKD to the surface of the base layer and the back layer of a multi-layered base paper for forming containers composed of two or more layers. The breakage and cracking of the base paper for forming containers during press forming including are improved.
また、表面と裏面への澱粉の固形分塗工量を合計で０．５０〜２．００ｇ／ｍ２、ＡＫＤの固形分塗工量を合計で０．０１８〜０．１００ｇ／ｍ２にすることにより、破断や割れがより良く改善される。 Moreover, the total solid content of starch on the front and back surfaces is 0.50 to 2.00 g / m 2 , and the total solid content of AKD is 0.018 to 0.100 g / m 2 . As a result, breakage and cracking are better improved.
本発明において優れた効果が得られる理由は明らかではないが、次のように考えられる。澱粉とＡＫＤとは相溶性が良く、これらの混合液を塗布することにより、表面と裏面に均一に塗工液が塗布されて、破断や割れが改善される。また、澱粉とＡＫＤを特定の範囲の塗工量となるように塗布することにより、均一な塗布面が得られるとともに、特にＡＫＤの塗工量が特定範囲にあることにより、紙表面に適度な滑り性が付与され、深絞り加工を含むプレス成形加工時に凹凸の型と成形容器用原紙の間に生ずる摩擦が軽減されて、破断や割れがより良く改善される。 The reason why an excellent effect is obtained in the present invention is not clear, but is considered as follows. Starch and AKD are compatible with each other, and by applying these mixed solutions, the coating solution is uniformly applied to the front and back surfaces, and breakage and cracking are improved. Further, by applying starch and AKD so as to have a coating amount in a specific range, a uniform coated surface can be obtained, and in particular, when the coating amount of AKD is in a specific range, it is suitable for the paper surface. Sliding property is imparted, and friction generated between the uneven mold and the forming container base paper during press forming processing including deep drawing processing is reduced, and breakage and cracking are better improved.
本発明に係る成形容器用原紙は、２層以上の複数層から成るように多層抄きされた後に、通常の塗工装置（ブレードコーター、エアナイフコーター、カーテンコーター、ゲートロールコーター等）で、澱粉とＡＫＤの混合液を塗工することにより得ることができる。表面と裏面への澱粉の固形分塗工量は合計で０．５０〜２．００ｇ／ｍ２、ＡＫＤの固形分塗工量は合計で０．０１８〜０．１００ｇ／ｍ２となるように塗工を行うことが好ましい。 The base paper for forming containers according to the present invention is multi-layered so as to be composed of two or more layers, and then starch is applied with a normal coating apparatus (blade coater, air knife coater, curtain coater, gate roll coater, etc.). It can be obtained by coating a mixture of AKD and AKD. The total solid content of starch on the front and back surfaces is 0.50 to 2.00 g / m 2 , and the total solid content of AKD is 0.018 to 0.100 g / m 2. It is preferable to perform coating.
澱粉とＡＫＤの固形分塗工量が上記の範囲にあることで、成形容器用原紙の破断や割れがより良く改善される。澱粉とＡＫＤの固形分塗工量が少なすぎる場合、成形容器用原紙をプレス加工する際に滑り性が足りず、破断や割れが発生しやすい。また多すぎる場合は逆に滑り性が高くなりすぎ、プレス加工の型が成形容器用原紙に接触したときに滑りすぎて、プレス加工に支障をきたすおそれがある。 When the solid content coating amount of starch and AKD is in the above range, breakage and cracking of the base paper for molded containers are improved more satisfactorily. When the solid content coating amount of starch and AKD is too small, slipperiness is insufficient when the base paper for forming containers is pressed, and breakage and cracking are likely to occur. On the other hand, when the amount is too large, the slipperiness becomes too high, and there is a risk that the press working die will slip too much when it comes into contact with the forming container base paper, thereby hindering the press working.
澱粉に変えてＰＶＡ等の水溶性樹脂も使用可能であるが、ＡＫＤとの組み合わせやコストや操作性を考慮すると澱粉を使用することが望ましい。澱粉は製紙用に使用されている酸化澱粉、カチオン化澱粉、両性澱粉、トウモロコシ澱粉、馬鈴薯澱粉、タピオカ澱粉等が使用できるが、これに限定されるものではない。 Although water-soluble resin such as PVA can be used instead of starch, it is desirable to use starch in consideration of combination with AKD, cost and operability. As the starch, oxidized starch, cationized starch, amphoteric starch, corn starch, potato starch, tapioca starch and the like used for papermaking can be used, but are not limited thereto.
ＡＫＤに変えてＡＳＡやステアリン酸カルシウム等の滑剤も使用可能であるが、滑り性のコントロールが困難である。ＡＫＤは澱粉との相溶性が良く、澱粉とＡＫＤの混合液とすることで表面と裏面に均一に塗工液が塗布されて、破断や割れの改善効果が高くなるため、ＡＫＤを使用することが望ましい。
また、本発明においては、澱粉とＡＫＤの他に、所望の効果を損なわない範囲で耐水化剤、顔料等を添加することもできる。
Lubricants such as ASA and calcium stearate can be used instead of AKD, but it is difficult to control the slipperiness. AKD has good compatibility with starch, and by using a mixture of starch and AKD, the coating solution is evenly applied to the front and back surfaces, increasing the effect of improving breakage and cracking. Use AKD. Is desirable.
In the present invention, in addition to starch and AKD, a water-resistant agent, a pigment, and the like can be added within a range that does not impair the desired effect.
本発明において、成形容器用原紙の表裏面の動摩擦係数は０．３０〜０．５０であることが好ましい。動摩擦係数が高すぎるとプレス加工する際に滑り性が足りず、破断や割れが発生しやすく、低すぎると滑り性が高くなりすぎプレス加工の型が成形容器用原紙に接触したときに滑りすぎて、プレス加工に支障をきたすおそれがある。 In this invention, it is preferable that the dynamic friction coefficients of the front and back surfaces of the base paper for forming containers are 0.30 to 0.50. If the coefficient of dynamic friction is too high, slipping will not be sufficient when pressing, and breakage and cracking will occur easily. Therefore, there is a risk of hindering press working.
また、本発明の成形容器用原紙は、断面水浸透度が０．２〜０．７ｍｍであることが好ましい。断面水浸透度がこの範囲であることにより、プレス成形加工後の容器製品における断面からの水浸透性が改善される。
断面水浸透度の試験法は次の方法で行う。すなわち、成形容器用原紙の両面にポリエチレンのラミネートを行い、そのラミネート試験片を赤インキの溶液（７５℃）に１０分間浸漬し、試験片の端面の赤色に染まった部分の浸透長さを測定する。
Moreover, it is preferable that the base paper for molded containers of the present invention has a cross-sectional water permeability of 0.2 to 0.7 mm. When the cross-sectional water permeability is within this range, the water permeability from the cross-section of the container product after press molding is improved.
The test method for the cross-sectional water permeability is as follows. In other words, polyethylene is laminated on both sides of the forming container base paper, the laminate test piece is immersed in a red ink solution (75 ° C.) for 10 minutes, and the permeation length of the red-dyed portion of the end face of the test piece is measured. To do.
断面水浸透度を０．２〜０．７ｍｍになるようにするには、サイズ剤、紙力剤、歩留剤等の各種内添薬品の添加率を調整することが挙げられる。例えば、原紙にロジン系サイズ剤を固形分で対パルプ０．５〜２．０％、硫酸バンドを固形分で対パルプ０．２〜０．６％、澱粉を固形分で対パルプ０．２〜１．０％、紙力剤としてポリアクリルアミド（ＰＡＭ）を固形分で対パルプ０．１〜０．５％内添することが好ましい。澱粉の種類は通常使用される内添用澱粉が使用される。各種内添薬品の添加率が少なすぎる場合は、所望の耐水性が得られず、添加率が多すぎる場合は、抄紙機系内での汚れが発生して操業性が悪化するおそれがある。 In order to adjust the cross-sectional water permeability to 0.2 to 0.7 mm, the addition rate of various internal additives such as a sizing agent, a paper strength agent, and a retention agent can be adjusted. For example, rosin-based sizing agent is 0.5 to 2.0% of pulp in solid content, sulfuric acid band is 0.2 to 0.6% of pulp in solid content, starch is 0.2 to 0.6% of pulp in solid content. It is preferable to add polyacrylamide (PAM) as a paper strength agent in an amount of 0.1 to 0.5% as a paper strength agent in a solid content. As the type of starch, commonly used starch for internal addition is used. When the addition rate of various internal additives is too small, desired water resistance cannot be obtained, and when the addition rate is too high, stains may occur in the paper machine system and the operability may be deteriorated.
本発明の成形容器用原紙は、紙製トレー等の成形容器に成形されて使用される。トレー用紙の坪量は一般的に２００ｇ／ｍ２以上の高坪量であるため、一層抄きにすると抄造時に脱水性が悪く、生産性が落ちるため２層以上での多層抄きが望ましい。また、深絞り成形を含むプレス成形加工時の剛性を保持するために、縦方向のこわさが９．０ｍＮ・ｍ以上で横方向のこわさが４．０ｍＮ・ｍ以上で、すき合わせ層のはくり強さが７０Ｎ／ｍ以上で、プレス成形加工時の適正な表面性を保持するために表面と裏面の平滑度が２０〜７０秒となるようにることが好ましい。このような成形容器用原紙を得るには、原料パルプの叩解度（フリーネス）、填料の種類と添加率、各種内添薬品の種類および添加率、抄紙機の操業条件等を適宜調整して、長網、円網、ウルトラフォーマー等の多層抄合わせマシンで抄造を行う。原料パルプとしては、Ｎ−ＢＫＰ、Ｌ−ＢＫＰ等を挙げることができる。成形容器用原紙は食品用トレー用紙等に使用されることが多いので、バージンパルプを配合することが望ましい。填料としては、タルク、カオリン、焼成カオリン、クレー、炭酸カルシウム等の製紙用填料を使用することができる。 The base paper for forming containers of the present invention is used after being formed into a forming container such as a paper tray. Since the basis weight of the tray paper is generally a high basis weight of 200 g / m 2 or more, when making one layer, the dewaterability is poor at the time of making paper, and the productivity is lowered. Also, in order to maintain the rigidity during press forming including deep drawing, the vertical stiffness is 9.0 mN · m or more and the lateral stiffness is 4.0 mN · m or more. The strength is preferably 70 N / m or more, and the smoothness of the front and back surfaces is preferably 20 to 70 seconds in order to maintain appropriate surface properties during press molding. In order to obtain such a forming container base paper, by appropriately adjusting the beating degree (freeness) of the raw material pulp, the type and addition rate of the filler, the types and addition rates of various internal chemicals, the operating conditions of the paper machine, Paper making is performed with a multi-layering machine such as a long net, circular net, or ultra former. Examples of the raw material pulp include N-BKP and L-BKP. Since the container container base paper is often used for food tray paper or the like, it is desirable to blend virgin pulp. As the filler, paper fillers such as talc, kaolin, calcined kaolin, clay and calcium carbonate can be used.
その後、押し出しラミネート等でＰＥＴ、ＴＰＸ、ＰＰ、ＰＥ等の樹脂コートを行い、印刷・打ち抜き断裁を経た後にプレス成形加工がなされて、成型容器が製造される。 Thereafter, a resin coating such as PET, TPX, PP, PE or the like is applied by extrusion lamination or the like, and after press printing / punching, press molding is performed to manufacture a molded container.
（原紙の製造）
Ｎ−ＢＫＰを３０％、Ｌ−ＢＫＰを７０％（各フリーネス３５０ｃｃ）の混合原料に、ロジンサイズを固形分で対パルプ０．９％、硫酸バンドを固形分で対パルプ０．９％、両性澱粉を固形分で対パルプ０．４％、ＰＡＭを固形分で対パルプ０．２％内添し、長網３層抄き抄紙機で３層抄合わせを行い、坪量２６０ｇ／ｍ２になるように原紙を抄造した。
(Manufacture of base paper)
30% N-BKP, 70% L-BKP (each freeness 350cc), rosin size 0.9% solid to pulp, sulfate band 0.9% pulp to solid, amphoteric Add 0.4% of starch to pulp and 0.2% of pulp to solid with solid content, and make 3 layers with long net 3 layer paper machine to a basis weight of 260g / m 2 The base paper was made as follows.
（実施例１）
前記原紙にコーンスターチの酸化澱粉が表裏面合計で固形分が１．１０ｇ／ｍ２、ＡＫＤが表裏面合計で固形分が０．０５５ｇ／ｍ２となるようにコーンスターチの酸化澱粉とＡＫＤの混合液をゲートロールコーターで塗工して、成形容器用原紙を得た。
Example 1
A mixed solution of corn starch oxidized starch and AKD so that the corn starch oxidized starch has a total solid content of 1.10 g / m 2 and AKD has a total solid content of 0.055 g / m 2 on the base paper. Was coated with a gate roll coater to obtain a base paper for forming containers.
（実施例２）
前記原紙にコーンスターチの酸化澱粉が表裏面合計で固形分が１．８０ｇ／ｍ２、ＡＫＤが表裏面合計で固形分が０．０９０ｇ／ｍ２となるようにコーンスターチの酸化澱粉とＡＫＤの混合液をゲートロールコーターで塗工した以外は、実施例１と同様にして成形容器用原紙を得た。
(Example 2)
Mixture of oxidized starch and AKD corn starch as the solid oxide starch corn starch on the front and back surfaces total raw paper is 1.80 g / m 2, AKD a 0.090 g / m 2 is solid with the front and back surfaces Total Was formed in the same manner as in Example 1 except that was coated with a gate roll coater.
（実施例３）
前記原紙にコーンスターチの酸化澱粉が表裏面合計で固形分が０．６０ｇ／ｍ２、ＡＫＤが表裏面合計で固形分が０．０２１ｇ／ｍ２となるようにコーンスターチの酸化澱粉とＡＫＤの混合液をゲートロールコーターで塗工した以外は、実施例１と同様にして成形容器用原紙を得た。
(Example 3)
Mixture of oxidized starch and AKD corn starch as the solid oxide starch corn starch on the front and back surfaces total raw paper is 0.60 g / m 2, AKD a 0.021 g / m 2 is solid with the front and back surfaces Total Was formed in the same manner as in Example 1 except that was coated with a gate roll coater.
（実施例４）
前記原紙にコーンスターチの酸化澱粉が表裏面合計で固形分が２．１０ｇ／ｍ２、ＡＫＤが表裏面合計で固形分が０．１０５ｇ／ｍ２となるようにコーンスターチの酸化澱粉とＡＫＤの混合液をゲートロールコーターで塗工した以外は、実施例１と同様にして成形容器用原紙を得た。
Example 4
Mixture of oxidized starch and AKD corn starch as the solid oxide starch corn starch on the front and back surfaces total raw paper is 2.10 g / m 2, AKD a 0.105 g / m 2 is solid with the front and back surfaces Total Was formed in the same manner as in Example 1 except that was coated with a gate roll coater.
（実施例５）
前記原紙にコーンスターチの酸化澱粉が表裏面合計で固形分が０．４０ｇ／ｍ２、ＡＫＤが表裏面合計で固形分が０．０１６ｇ／ｍ２となるようにコーンスターチの酸化澱粉とＡＫＤの混合液をゲートロールコーターで塗工した以外は、実施例１と同様にして成形容器用原紙を得た。
(Example 5)
Mixture of oxidized starch and AKD corn starch as the solid content of oxidized starch of corn starch in the sheet is on the front and back surfaces sum is 0.016 g / m 2 is solid with the front and back surfaces total 0.40 g / m 2, AKD Was formed in the same manner as in Example 1 except that was coated with a gate roll coater.
（比較例１）
前記原紙にポリビニルアルコール（ＰＶＡ）が表裏面合計で固形分が１．１０ｇ／ｍ２、ＡＫＤが表裏面合計で固形分が０．０５５ｇ／ｍ２となるようにＰＶＡとＡＫＤの混合液をゲートロールコーターで塗工した以外は、実施例１と同様にして成形容器用原紙を得た。
(Comparative Example 1)
Gate the mixed liquid of PVA and AKD so that polyvinyl alcohol (PVA) has a total solid content of 1.10 g / m 2 and AKD has a total solid content of 0.055 g / m 2 on the base paper. A forming container base paper was obtained in the same manner as in Example 1 except that coating was performed with a roll coater.
（比較例２）
前記原紙にコーンスターチの酸化澱粉が表裏面合計で固形分が１．１０ｇ／ｍ２、ステアリン酸カルシウムが表裏面合計で固形分が０．０５５ｇ／ｍ２となるようにコーンスターチの酸化澱粉とステアリン酸カルシウムの混合液をゲートロールコーターで塗工した以外は、実施例１と同様にして成形容器用原紙を得た。
＜評価・試験方法＞
(Comparative Example 2)
Solids 1.10 g / m 2 of oxidized starch of corn starch on the front and back surfaces sum to said base paper, calcium stearate solids on the front and back surfaces total of oxidized starch and calcium stearate cornstarch so that 0.055 g / m 2 A base paper for a forming container was obtained in the same manner as in Example 1 except that the mixed solution was coated with a gate roll coater.
<Evaluation and test methods>
＜動摩擦係数＞
ＪＩＳ−Ｐ８１４７：２０１０に従い、成形容器用原紙の表面の動摩擦係数
を測定した。
<Dynamic friction coefficient>
According to JIS-P8147: 2010, the dynamic friction coefficient of the surface of the base paper for forming containers was measured.
＜深絞り成型加工時の破れ・割れの判定＞
○ 全く破れ・割れが生じない。
△ １００回の深絞り成形加工のうち３回以下の破れもしくは割れが発生する。。
× １００回の深絞り成形加工のうち４回以上の破れもしくは割れが生じ製品として不可。
<Determination of tears and cracks during deep drawing>
○ No tearing or cracking occurs.
Δ: Breaking or cracking 3 times or less in 100 deep drawing processes. .
× Out of 100 deep-draw molding processes, it is not possible to produce a product that breaks or cracks 4 times or more.
＜深絞り成型加工時の滑り性の判定＞
○ 滑り性が良好。
△ 滑り性が許容範囲。
× 滑り性が高すぎで深絞り加工がしにくい。
あるいは、滑り性が足らず深絞り加工がしにくい。
<Determination of slipperiness during deep drawing molding>
○ Good slipperiness.
△ Slidability is acceptable.
× The sliding property is too high, making deep drawing difficult.
Or, it is difficult to perform deep drawing due to lack of slipperiness.
＜混合液の発泡性の判定＞
○ 混合液の発泡が全く生じない。
△ 混合液の発泡は生じるが、問題のないレベル。
× 混合液の発泡が多く、均一な塗工ができない。
<Determination of foamability of liquid mixture>
○ No foaming of the mixture occurs.
△ Foaming of the mixed liquid occurs, but there is no problem.
X There is much foaming of the mixed solution, and uniform coating cannot be performed.
＜表１＞
表１の結果から、表層と裏層の表面に澱粉とアルキルケテンダイマーの混合液を塗工した本発明の実施例１〜５では、混合液が発泡することがなく、塗工液を均一に塗布することができる。また、表面の滑り性も良好で、深絞り成型加工時の破れ・割れが防止された成型容器用原紙が得られることがわかる。
これに対し、澱粉に代えてＰＶＡを使用した比較例１では、ＡＫＤとの混合液の粘性が高くなり操作性が悪化するとともに、発泡して均一な塗工面が得られず、深絞り成型加工時の破れ・割れが発生した。また、ＡＫＤに代えてステアリン酸カルシウムを使用した比較例２では、滑り性が高くなりすぎて作業性が悪く、深絞り成型加工に悪影響を及ぼした。
From the results of Table 1, in Examples 1 to 5 of the present invention in which a mixture of starch and alkyl ketene dimer was applied to the surface of the front layer and the back layer, the mixture did not foam, and the coating solution was uniform. Can be applied. Further, it can be seen that a base paper for molded containers having good surface slipperiness and preventing tearing and cracking during deep drawing is obtained.
On the other hand, in Comparative Example 1 using PVA instead of starch, the viscosity of the mixed solution with AKD is increased and the operability is deteriorated, and the foam is not foamed and a uniform coated surface cannot be obtained. Time breaks and cracks occurred. Further, in Comparative Example 2 in which calcium stearate was used instead of AKD, the slipperiness was too high, the workability was poor, and the deep drawing process was adversely affected.
Claims (8)
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| JP2017193798A (en) * | 2016-04-20 | 2017-10-26 | 王子ホールディングス株式会社 | Paper substrate for foam heat insulating paper container, sheet for foam heat insulating paper container, and foam heat insulating paper container |
| JP2018131712A (en) * | 2017-02-15 | 2018-08-23 | 大王製紙株式会社 | Scratch-preventing paper and scratch-preventing packaging container |
| JP2019014977A (en) * | 2017-07-03 | 2019-01-31 | 王子ホールディングス株式会社 | Base paper for gypsum board and method of manufacturing the same |
| JP2020143980A (en) * | 2019-03-06 | 2020-09-10 | トヨタ自動車株式会社 | Dynamic friction coefficient measurement device |
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| JP2019014977A (en) * | 2017-07-03 | 2019-01-31 | 王子ホールディングス株式会社 | Base paper for gypsum board and method of manufacturing the same |
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