JP2015086479A - Light shielding paper-made packaging material - Google Patents
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Abstract
Description
本発明は、食品包装容器等に使用され遮光性を有する包材に関する。 The present invention relates to a packaging material that is used in food packaging containers and the like and has a light shielding property.
従来から、紙製の包材は安価で加工が容易であることから、各種食品の包装容器等に使用されている。ところが、紙は光線を透過させやすく、容器内の食品の劣化をきたすおそれがある。そこで、複数層の紙を積層（抄き合せ）し、そのうち中間層にカーボンブラックを０．４ｇ/ｍ２以上含有させることで、遮光性を確保した紙材が開発されている（特許文献１参照）。 2. Description of the Related Art Conventionally, paper packaging materials are used in various food packaging containers because they are inexpensive and easy to process. However, paper is likely to transmit light and may cause deterioration of food in the container. Therefore, a paper material that secures light-shielding properties has been developed by laminating (combining) a plurality of layers of paper, and including 0.4 g / m 2 or more of carbon black in the intermediate layer (Patent Document 1). reference).
しかしながら、本発明者らが検討した結果、紙にカーボンブラックを０．４ｇ/ｍ２以上添加すると、紙力の低下をもたらすことが判明した。紙力が低下すると、容器成型(加工)時に紙材が破断したり、輸送時や店頭陳列時に容器が損傷してしまう。そして、これを補うためには紙力増強剤の配合量を増加したり、パルプ等の原材料の調整が必要となり、コストアップにつながる。
更に、食品包装用途に使用される紙材は、容器成型時に紙材の端面部が内容物に接することがあり、この場合には中間層にカーボンブラックや各種添加剤が過剰に存在すると内容物に触れたり溶出するおそれがあるので、中間層へのカーボンブラックや各種添加剤の添加量は少ないことが望ましい。
一方、中間層へのカーボンブラックの添加量が少ないと光が透過し、十分な遮光性が得られない。
However, as a result of studies by the present inventors, it has been found that adding 0.4 g / m 2 or more of carbon black to paper causes a reduction in paper strength. When the paper strength is reduced, the paper material is broken at the time of molding (processing) the container, or the container is damaged at the time of transportation or display at the store. In order to compensate for this, it is necessary to increase the blending amount of the paper strength enhancer or to adjust raw materials such as pulp, which leads to an increase in cost.
Furthermore, paper materials used for food packaging applications may come into contact with the contents when the container is molded. In this case, if the intermediate layer contains excessive carbon black or various additives, the contents It is desirable that the amount of carbon black and various additives added to the intermediate layer be small.
On the other hand, if the amount of carbon black added to the intermediate layer is small, light is transmitted and sufficient light shielding properties cannot be obtained.
従って本発明は、３層以上積層された紙からなる遮光性紙製包材において、中間層に含まれる顔料の量が少なくても充分な遮光性を有するとともに、強度が高く、中間層からの顔料の溶出を低減できる遮光性紙製包材の提供を目的とする。 Accordingly, the present invention provides a light-shielding paper packaging material made of paper laminated with three or more layers, and has sufficient light-shielding properties even when the amount of the pigment contained in the intermediate layer is small, and has high strength. An object of the present invention is to provide a light-shielding paper packaging material that can reduce pigment elution.
上記課題を解決するため、本発明の遮光性紙製包材は、３層以上積層された紙からなり、そのうち中間層が顔料を０．１ｇ/ｍ２以上０．４ｇ/ｍ２未満含む紙であり、該中間層のＣＤ方向の裂断長が３．０ｋｍ以上、かつ該中間層の不透明度が９９%以上である。
中間層に含まれる顔料が０．４ｇ/ｍ２以上になると、中間層の紙力が低下すると共に、遮光性紙製包材を容器成型時に包材の端面部が内容物に接することがあり、中間層に顔料が過剰に存在する場合は溶出するおそれがある。一方、中間層が顔料を０．１ｇ/ｍ２以上０．４ｇ/ｍ２未満含有すれば、十分な遮光性が得られることが判明し、これにより紙力と遮光性を両立することができた。
To solve the above problems, light-shielding Paper packaging material of the present invention consists of paper stacked three or more layers, of which a paper intermediate layer comprises less than 0.4g / m 2 0.1g / m 2 or more pigments The tear length in the CD direction of the intermediate layer is 3.0 km or more, and the opacity of the intermediate layer is 99% or more.
When the pigment contained in the intermediate layer is 0.4 g / m 2 or more, the paper strength of the intermediate layer is reduced, and the end face of the packaging material may come into contact with the contents when the light-shielding paper packaging material is molded into a container. If the pigment is excessively present in the intermediate layer, it may be eluted. On the other hand, it was found that if the intermediate layer contains a pigment of 0.1 g / m 2 or more and less than 0.4 g / m 2 , sufficient light shielding properties can be obtained, thereby making it possible to achieve both paper strength and light shielding properties. It was.
前記顔料は、カーボンブラックであることが好ましい。
３００〜６００ｎｍの波長領域において、光線透過率が０．１％未満であることが好ましい。
The pigment is preferably carbon black.
In the wavelength region of 300 to 600 nm, the light transmittance is preferably less than 0.1%.
この発明によれば、３層以上積層された紙からなる遮光性紙製包材において、中間層に含まれる顔料の量が少なくても充分な遮光性を有するとともに、強度が高く、中間層からの顔料の溶出を低減できる遮光性紙製包材が得られる。 According to the present invention, in the light-shielding paper packaging material made of paper laminated with three or more layers, the light-shielding paper packaging material has a sufficient light-shielding property even if the amount of the pigment contained in the intermediate layer is small, and has high strength. A light-shielding paper packaging material that can reduce the elution of the pigment is obtained.
以下に本発明の実施形態について説明する。図１は本発明の実施形態に係る遮光性紙製包材１０の分解斜視図である。
図１に示すように、遮光性紙製包材１０は、それぞれシート紙である上層２、中間層４、及び下層６をこの順に積層してなる。各層２〜６は、パルプを抄造して形成することができる。
原料パルプとして、例えば、化学パルプであるＮＢＫＰ、ＬＢＫＰを主成分（５０質量％以上）として使用することができるが、さらにNUKP、LUKPや非木材パルプなどを配合してもよい。原料パルプは、１種類を用いても良いが、通常は、用途や目的に応じて２種類以上を混合して用いる。
各層２〜６は、それぞれ１層であってもよく、２層以上であってもよい。なお、中間層４はそれぞれ少なくとも１層の上層２及び下層６で挟まれていればよい。又、各層２〜６の間や、上層２又は下層６の表面に紙以外の層（例えばフィルム層）が設けられてもよい。通常は、遮光性紙製包材１０の上層２又は下層６の表面に、フィルムがラミネートされることが多い。
Embodiments of the present invention will be described below. FIG. 1 is an exploded perspective view of a light-shielding paper packaging material 10 according to an embodiment of the present invention.
As shown in FIG. 1, the light-shielding paper packaging material 10 is formed by laminating an upper layer 2, an intermediate layer 4, and a lower layer 6, which are sheet papers, in this order. Each of the layers 2 to 6 can be formed by making pulp.
As raw material pulp, for example, NBKP and LBKP which are chemical pulps can be used as main components (50% by mass or more), but NUKP, LUKP, non-wood pulp and the like may be further blended. One kind of raw material pulp may be used, but usually two or more kinds are mixed and used according to the purpose and purpose.
Each of the layers 2 to 6 may be a single layer or two or more layers. The intermediate layer 4 may be sandwiched between at least one upper layer 2 and lower layer 6. Further, a layer (for example, a film layer) other than paper may be provided between the layers 2 to 6 or on the surface of the upper layer 2 or the lower layer 6. Usually, a film is often laminated on the surface of the upper layer 2 or the lower layer 6 of the light-shielding paper packaging material 10.
各層２〜６は、澱粉やPAM系の紙力剤を層間接着剤として積層することができる。澱粉としては、例えば、タピオカ、トウモロコシ、馬鈴薯等や、カチオン化澱粉、変性澱粉が挙げられる。各層間に塗布される澱粉およびPAM系の紙力剤は、１．０〜３．０質量％の水溶液とすることができる。
なお、「積層」とは、それぞれ抄紙された各層２〜６を後から層間接着剤により積層することだけでなく、各層２〜６を構成する湿紙を抄き合わせ（３層抄）して抄紙してもよく、抄き合わせの方が層間強度が向上するので好ましい。
又、容器の内容物に応じて各層２〜６を中性抄造しても良いし、酸性抄造しても良い。
Each layer 2 to 6 can be laminated with starch or PAM-based paper strength agent as an interlayer adhesive. Examples of the starch include tapioca, corn, potato, cationized starch, and modified starch. The starch and PAM-based paper strength agent applied between each layer can be made into a 1.0 to 3.0% by mass aqueous solution.
“Lamination” means not only laminating each of the layers 2 to 6 after the respective paper making with an interlayer adhesive, but also making a wet paper (3 layers) of the layers 2 to 6 together. Paper making may be performed, and paper making is preferable because the interlayer strength is improved.
Moreover, according to the contents of a container, each layer 2-6 may be made into neutral papermaking, and may be acid papermaking.
中間層４は顔料を０．１ｇ/ｍ２以上０．４ｇ/ｍ２未満含む紙である。
中間層４に含まれる顔料が０．４ｇ/ｍ２以上になると、中間層の紙力の低下をもたらす。中間層の紙力が低下すると、本発明の遮光性紙製包材を容器に成型(加工)した時に、座屈・潰れ等の成形不良となる層間剥離を生じやすくなる。その結果、容器成型(加工)時に遮光性紙製包材１０が破断したり、輸送時や店頭陳列時に容器が損傷してしまう。そして、これを補うためには紙力増強剤の配合量を増加したり、パルプ等の原材料の調整が必要となり、コストアップにつながる。
又、遮光性紙製包材１０を食品包装用途に使用する場合、容器成型時に包材１０（中間層４）の端面部が内容物に接することがあり、この場合には中間層４に含まれる顔料や各種添加剤が内容物に触れたり、これら顔料等が過剰に存在する場合は溶出するおそれがあるので、この点でも中間層４の顔料の含有量を０．４ｇ/ｍ２未満とする。
一方、中間層４の顔料の含有量が少な過ぎると光が透過し、十分な遮光性（不透明度）が得られない。従って、中間層４の顔料の含有量を０．１ｇ/ｍ２以上とする。なお、中間層が顔料を０．１ｇ/ｍ２以上含むと、中間層の不透明度が９９%以上となって十分な遮光性が得られる。不透明度は、ＪＩＳ Ｐ８１４８に準じた色差計を使用して求める。
The intermediate layer 4 is a paper containing a pigment of 0.1 g / m 2 or more and less than 0.4 g / m 2 .
When the pigment contained in the intermediate layer 4 is 0.4 g / m 2 or more, the paper strength of the intermediate layer is reduced. When the paper strength of the intermediate layer is reduced, delamination that causes molding defects such as buckling and crushing tends to occur when the light-shielding paper packaging material of the present invention is molded (processed) into a container. As a result, the light-shielding paper packaging material 10 is broken during container molding (processing), or the container is damaged during transportation or store display. In order to compensate for this, it is necessary to increase the blending amount of the paper strength enhancer or to adjust raw materials such as pulp, which leads to an increase in cost.
When the light-shielding paper packaging material 10 is used for food packaging, the end surface of the packaging material 10 (intermediate layer 4) may come into contact with the contents during container molding. In this point, the content of the pigment in the intermediate layer 4 is less than 0.4 g / m 2 To do.
On the other hand, if the content of the pigment in the intermediate layer 4 is too small, light is transmitted and sufficient light shielding properties (opacity) cannot be obtained. Therefore, the pigment content of the intermediate layer 4 is set to 0.1 g / m 2 or more. When the intermediate layer contains 0.1 g / m 2 or more of the pigment, the opacity of the intermediate layer becomes 99% or more, and sufficient light shielding properties can be obtained. The opacity is determined using a color difference meter according to JIS P8148.
なお、特許文献１によれば、中間層４に顔料を０．４ｇ/ｍ２以上含有しないと、十分な遮光性が得られないとされているが、この場合には紙力が低下する。そして、中間層４が顔料を０．４ｇ/ｍ２未満しか含有しなくても、十分な遮光性が得られることを本発明者は見出し、紙力と遮光性を両立することができた。
また、中間層４の遮光性を上げる方法として、古紙を使用する方法があるが、食品用途の紙製包装材としては好ましくない。
According to Patent Document 1, it is said that sufficient light-shielding properties cannot be obtained unless the intermediate layer 4 contains 0.4 g / m 2 or more of pigment, but in this case, paper strength is reduced. The inventor found that sufficient light shielding properties can be obtained even when the intermediate layer 4 contains less than 0.4 g / m 2 of pigment, and was able to achieve both paper strength and light shielding properties.
Moreover, as a method for improving the light shielding property of the intermediate layer 4, there is a method using waste paper, but it is not preferable as a paper packaging material for food use.
顔料としては、遮光能力に優れる黒色顔料が好ましく、例えばカーボンブラックが挙げられる。 As the pigment, a black pigment having excellent light shielding ability is preferable, and for example, carbon black is used.
中間層４のＣＤ方向の裂断長が３．０ｋｍ以上である。中間層４のＣＤ方向の裂断長が３．０ｋｍ未満であると、中間層の紙力が低下し、Z軸（紙の厚さ方向）の強度も低くなることから、上記したように容器成型(加工)時に座屈・潰れ等の成形不良の原因となる層間剥離を生じやすくなる。
なお、裂断長(km)=引張強度(kgf)×1000/坪量(g/m2)×試験片巾(mm)で求める。
The breaking length in the CD direction of the intermediate layer 4 is 3.0 km or more. When the tear length in the CD direction of the intermediate layer 4 is less than 3.0 km, the paper strength of the intermediate layer is reduced and the strength of the Z-axis (paper thickness direction) is also reduced. It tends to cause delamination that causes molding defects such as buckling and crushing during molding (processing).
Note that the breaking length (km) = tensile strength (kgf) × 1000 / basis weight (g / m 2 ) × test specimen width (mm).
中間層４の坪量は特に限定されず、適用される容器によって変化するが、カップなどの紙製包材に加工する際の加工適性の点から、２５〜１２０g/m2が好適である。
また、美麗性を鑑みると、遮光性紙製包材全体の明度は６０％以上が好ましく、より好ましくは７０％以上である。そのため、中間層の表裏に存在する上層及び下層の坪量はそれぞれ５０g/m2以上が好ましく、より好ましくは６０g/m2以上である。
遮光性紙製包材の明度は、色差計（ＣＭＳ−３５ＳＰＸ、村上色彩製）を用いて、紫外光を含む光源にて測定して得られたＹ値を明度として用いる。
遮光性紙製包材１０は、上述の構成により、３００〜６００ｎｍの波長領域において、光線透過率を０．１％未満とすることができる。
The basis weight of the intermediate layer 4 is not particularly limited and varies depending on the container to be applied, but is preferably 25 to 120 g / m 2 from the viewpoint of processability when processed into a paper packaging material such as a cup.
In view of beauty, the lightness of the entire light-shielding paper packaging material is preferably 60% or more, more preferably 70% or more. Therefore, the basis weights of the upper layer and the lower layer existing on the front and back of the intermediate layer are each preferably 50 g / m 2 or more, more preferably 60 g / m 2 or more.
For the lightness of the light-shielding paper packaging material, the Y value obtained by measuring with a light source including ultraviolet light using a color difference meter (CMS-35SPX, manufactured by Murakami Color) is used as the lightness.
The light-shielding paper packaging material 10 can have a light transmittance of less than 0.1% in the wavelength region of 300 to 600 nm with the above-described configuration.
本発明は上記した実施形態に限定されず、本発明の思想と範囲に含まれる様々な変形及び均等物に及ぶことはいうまでもない。 It goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents included in the spirit and scope of the present invention.
表１に示すパルプ原料及び内添薬品を用いてパルプスラリーを調製し、それぞれ上層２、中間層４、及び下層６を抄造した。次に、中間層４の表裏に、層間接着剤としてタピオカ由来の澱粉（三晶社 SB GUM-R(アセチル化タピオカ澱粉)）の２質量％水溶液を噴射し、上層２、中間層４、及び下層６の順となるように積層して遮光性紙製包材１０を製造した。 Pulp slurry was prepared using pulp raw materials and internal chemicals shown in Table 1, and upper layer 2, intermediate layer 4 and lower layer 6 were made. Next, a 2 mass% aqueous solution of starch derived from tapioca (Sanki Co., Ltd. SB GUM-R (acetylated tapioca starch)) as an interlayer adhesive is sprayed on the front and back of the intermediate layer 4, and the upper layer 2, the intermediate layer 4, and The light-shielding paper packaging material 10 was manufactured by stacking in the order of the lower layer 6.
得られた遮光性紙製包材１０について以下の評価を行った。
坪量：ＪＩＳ Ｐ−８１２４に従って行った。
厚さ：ＪＩＳ Ｐ−８１１８に従って行った。
密度：厚さと坪量から算出した。
層間強度：J.TAPPI No.19-1に記載の「すき合わせ層の剥離強さの最大荷重」に従って、層間強度を測定した。
剛度（横）：ＣＤ方向につき、ＪＩＳ Ｐ−８１２５に従って測定した。
cobb吸水度(コッブ値) ：ＪＩＳ Ｐ−８１４０に準じて行い、下層６側から６０分間吸水させた後、吸収された水の質量を 1m2当たりに換算してcobb吸水度とした。試験面積は，約100cm2である。吸水度試験器は、一面が平滑に仕上げられた硬い台板と内径12.8±0.2mm（試験面積約 100cm2）の金属シリンダと台板に固定するためのクランプから成る。
引張り強さ：ＪＩＳ Ｐ８１１３に基づいて、横方向引張り強さを測定した。この値と坪量から、紙の一端を固定懸垂して、その自重で切れる時の紙の長さである。裂断長（ｋｍ）を次式より求めた。
裂断長（ｋｍ）＝引張強度(kgf)×1000/［坪量(g/m2)×試験片巾(mm)］
中間層の不透明度：ＪＩＳ Ｐ８１４９「紙及び板紙−不透明度試験方法（紙の裏当て）−拡散照明法」に基づいて、色差計（ＣＭＳ−３５ＳＰＸ、村上色彩製）を用いて、紫外光を含む光源にて測定した。
遮光性：分光光度計(日本分光社製)を用いて、波長３００〜６００nmの範囲の光線透過率を測定した。評価は０．１％未満を○、０．１%以上を×とした。
The obtained light-shielding paper packaging material 10 was evaluated as follows.
Basis weight: Measured according to JIS P-8124.
Thickness: Performed according to JIS P-8118.
Density: Calculated from thickness and basis weight.
Interlaminar strength: Interlaminar strength was measured in accordance with “Maximum load of peel strength of bonded layers” described in J.TAPPI No.19-1.
Stiffness (lateral): Measured according to JIS P-8125 in the CD direction.
cobb water absorption (Cobb value): Cobb water absorption was carried out according to JIS P-8140, and after absorbing water for 60 minutes from the lower layer 6 side, the mass of absorbed water was converted to 1 m 2 to obtain cobb water absorption. Test area is about 100 cm 2. The water absorption tester consists of a hard base plate with a smooth finish, a metal cylinder with an inner diameter of 12.8 ± 0.2 mm (test area approximately 100 cm 2 ), and a clamp for fixing to the base plate.
Tensile strength: Transverse tensile strength was measured based on JIS P8113. From this value and basis weight, it is the length of the paper when one end of the paper is fixedly suspended and cut by its own weight. The fracture length (km) was obtained from the following equation.
Breaking length (km) = tensile strength (kgf) x 1000 / [basis weight (g / m 2 ) x specimen width (mm)]
Opacity of the intermediate layer: Based on JIS P8149 “Paper and paperboard—Opacity test method (backing of paper) —Diffusion illumination method”, using a color difference meter (CMS-35SPX, manufactured by Murakami Color Co., Ltd.) Measured with a light source including.
Light shielding property: The light transmittance in the wavelength range of 300 to 600 nm was measured using a spectrophotometer (manufactured by JASCO Corporation). In the evaluation, less than 0.1% was evaluated as ◯, and 0.1% or more was evaluated as ×.
なお、坪量、引張強さ、厚さの測定は、JIS-P8111に規定する温湿度条件下(２３±１℃、５０±２％ＲＨ)で平衡状態に保持後に行った。
得られた結果を表１、表２に示す。
The basis weight, tensile strength, and thickness were measured after maintaining the equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in JIS-P8111.
The obtained results are shown in Tables 1 and 2.
表１から明らかなように、中間層が顔料としてカーボンブラックを０．１ｇ/ｍ２以上０．４ｇ/ｍ２未満含む紙である実施例１〜５の場合、充分な遮光性を有するとともに、中間層のＣＤ方向の裂断長が３．０ｋｍ以上となって強度が優れていた。
又、表２から明らかなように、中間層のカーボンブラックの含有量が０．１ｇ/ｍ２以上０．４ｇ/ｍ２未満の範囲で、不透明度が９９％以上となり、０．４ｇ/ｍ２未満であっても充分な遮光性を有することがわかった。
As is evident from Table 1, when the intermediate layer is of Examples 1 to 5 is a paper containing less than carbon black 0.1 g / m 2 or more 0.4 g / m 2 as a pigment, which has a sufficient light-shielding properties, The intermediate layer had a breaking strength in the CD direction of 3.0 km or more, and was excellent in strength.
As is clear from Table 2, when the carbon black content in the intermediate layer is in the range of 0.1 g / m 2 or more and less than 0.4 g / m 2 , the opacity is 99% or more and 0.4 g / m 2. Even if it was less than 2 , it turned out that it has sufficient light-shielding property.
一方、中間層が顔料としてカーボンブラックを０．４ｇ/ｍ２以上含む比較例１の場合、中間層のＣＤ方向の裂断長が３．０ｋｍ未満となって強度が低下した。
中間層のカーボンブラックの含有量が０．１ｇ/ｍ２未満である比較例２の場合、中間層の不透明度が９９％未満となって遮光性が低下した。
On the other hand, in the case of Comparative Example 1 in which the intermediate layer contained 0.4 g / m 2 or more of carbon black as a pigment, the tear length in the CD direction of the intermediate layer was less than 3.0 km and the strength was lowered.
In the case of Comparative Example 2 in which the content of carbon black in the intermediate layer was less than 0.1 g / m 2 , the opacity of the intermediate layer was less than 99%, and the light shielding property was lowered.
２ 上層
４ 中間層
６ 下層
１０ 遮光性紙製包材
2 Upper layer 4 Intermediate layer 6 Lower layer 10 Light-shielding paper packaging material
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| JP7506625B2 (en) | 2021-03-17 | 2024-06-26 | 東罐興業株式会社 | Light-shielding paper for food packaging and paper cup containers using the same |
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