JP7524781B2 - Moisture-proof paper and method for producing moisture-proof paper - Google Patents
Moisture-proof paper and method for producing moisture-proof paper Download PDFInfo
- Publication number
- JP7524781B2 JP7524781B2 JP2021013380A JP2021013380A JP7524781B2 JP 7524781 B2 JP7524781 B2 JP 7524781B2 JP 2021013380 A JP2021013380 A JP 2021013380A JP 2021013380 A JP2021013380 A JP 2021013380A JP 7524781 B2 JP7524781 B2 JP 7524781B2
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene resin
- paper
- moisture
- layer
- resin layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
Description
本発明は、防湿性の優れたポリエチレン樹脂層を有する防湿紙及びその製造方法に関する。 The present invention relates to moisture-proof paper having a polyethylene resin layer with excellent moisture-proof properties and a method for manufacturing the same.
紙に防湿性を有するポリエチレン樹脂層を積層した防湿紙は、例えば、吸湿を嫌う食品や粉末状の洗剤等の包装用材として利用されている。従来は、低密度～中密度ポリエチレン樹脂による樹脂層と紙との積層構成からなる防湿紙が利用されていたが、高い防湿性を要求される場合、樹脂層として高密度ポリエチレン樹脂を用いることが提案されている（特許文献１）。 Moisture-proof paper, which is made by laminating a moisture-proof polyethylene resin layer onto paper, is used, for example, as a packaging material for foods and powdered detergents that do not like moisture absorption. Conventionally, moisture-proof paper made of a laminated structure of paper and a resin layer made of low- to medium-density polyethylene resin has been used, but when high moisture-proof properties are required, it has been proposed to use high-density polyethylene resin as the resin layer (Patent Document 1).
近年、地球環境を考慮し、プラスチックフィルムやプラスチックそのものの包装体の代替として防湿紙の使用が検討されている。例えば、洗剤、菓子、乾燥食品、食器用など様々の袋や箱に防湿紙の使用が見込まれている。このため、防湿紙においても防湿性を更に高めることが課題となっている。特許文献１には、低密度ポリエチレン樹脂から高密度ポリエチレン樹脂に変更することで防湿性を高めているが、更に防湿性を高めることが必要である。ポリエチレン樹脂層の厚みを増せば防湿性が高まるが、加工適性が劣るとともに、防湿紙の風合いも損なうことになる。本発明では、ポリエチレン樹脂層の厚みを増やすことなく、防湿性を高めることが課題である。 In recent years, in consideration of the global environment, the use of moisture-proof paper has been considered as an alternative to plastic film or plastic packaging. For example, it is expected that moisture-proof paper will be used in a variety of bags and boxes for detergents, sweets, dried foods, tableware, etc. For this reason, it is an issue to further improve the moisture-proofing properties of moisture-proof paper. In Patent Document 1, moisture-proofing is improved by changing from low-density polyethylene resin to high-density polyethylene resin, but it is necessary to further improve moisture-proofing. Increasing the thickness of the polyethylene resin layer increases moisture-proofing properties, but this leads to poor processing suitability and a loss of texture of the moisture-proof paper. In the present invention, the issue is to increase moisture-proofing properties without increasing the thickness of the polyethylene resin layer.
特許文献１に記載されているように、ポリエチレン層に高密度ポリエチレン樹脂を用いることで防湿性が高まることが知られている。しかし、ポリエチレン樹脂層の厚みを変更することなく、防湿性を更に高めることは困難であった。本発明者等は、上記課題を解決するためポリエチレン樹脂層の研究を鋭意行った結果、密度の異なる高密度ポリエチレン樹脂と低密度ポリエチレン樹脂を積層することにより、一段と防湿性が高まることを見出し、本発明に至った。即ち、本発明は以下のとおりである。 As described in Patent Document 1, it is known that the use of high-density polyethylene resin in the polyethylene layer improves moisture resistance. However, it has been difficult to further improve moisture resistance without changing the thickness of the polyethylene resin layer. The inventors of the present invention have conducted extensive research into the polyethylene resin layer to solve the above problem, and have discovered that moisture resistance can be further improved by laminating high-density polyethylene resin and low-density polyethylene resin, which have different densities, and have arrived at the present invention. That is, the present invention is as follows.
（１）紙層の片面にポリエチレン樹脂層を設けた防湿紙であって、
前記ポリエチレン樹脂層が、紙層側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層有する層である防湿紙。
（２）紙層（Ａ）と紙層（Ｂ）の間にポリエチレン樹脂層を設けた防湿紙であって、
前記ポリエチレン樹脂層が、紙層（Ａ）側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層有する層である防湿紙。
（３）前記ポリエチレン樹脂層が、高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層を共押出ラミネートにより積層され層である（１）又は（２）に記載の防湿紙。
（４）前記ポリエチレン樹脂層の厚みが２０～４０μｍである（１）～（３）のいずれかに記載の防湿紙。
（５）前記ポリエチレン樹脂層の全厚みに対する低密度ポリエチレン樹脂層の厚みが２０％以上、４０％以下である（１）～（４）のいずれかに記載の防湿紙。
（６）前記ポリエチレン樹脂層が、植物由来のポリエチレン樹脂を含む（１）～（５）のいずれかに記載の防湿紙。
（７）ＪＩＳ Ｚ－０２０８に規定されるカップ法Ｂ法に基づいて測定される透湿度が１３ｇ ／ｍ２・２４ｈｒ以下であること（１）～（６）のいずれかに記載の防湿紙。
（８）紙層の片面に、前記紙層側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層をポリエチレン樹脂層として共押出ラミネートする防湿紙の製造方法。
（９）紙層（Ａ）と紙層（Ｂ）の間に、前記紙層（Ａ）側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層をポリエチレン樹脂層として共押出ラミネートすることで紙層（Ａ）と紙層（Ｂ）を接合する防湿紙の製造方法。
(1) A moisture-proof paper having a polyethylene resin layer on one side of a paper layer,
The moisture-proof paper has at least three polyethylene resin layers, from the paper layer side, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b) and a high-density polyethylene resin layer (c).
(2) A moisture-proof paper having a polyethylene resin layer between a paper layer (A) and a paper layer (B),
The moisture-proof paper has at least three polyethylene resin layers, from the paper layer (A) side, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b) and a high-density polyethylene resin layer (c).
(3) The moisture-proof paper according to (1) or (2), wherein the polyethylene resin layer is a layer obtained by coextrusion lamination of at least three layers, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c).
(4) The moisture-proof paper according to any one of (1) to (3), wherein the polyethylene resin layer has a thickness of 20 to 40 μm.
(5) The moisture-proof paper according to any one of (1) to (4), wherein the thickness of the low-density polyethylene resin layer is 20% or more and 40% or less of the total thickness of the polyethylene resin layer.
(6) The moisture-proof paper according to any one of (1) to (5), wherein the polyethylene resin layer contains a polyethylene resin derived from plants.
(7) The moisture-proof paper according to any one of (1) to (6), having a moisture permeability of 13 g/ m2 ·24 hr or less as measured based on the cup method B specified in JIS Z-0208.
(8) A method for producing moisture-proof paper, in which at least three layers, namely a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c), are co-extrusion laminated onto one side of a paper layer as polyethylene resin layers from the paper layer side.
(9) A method for producing moisture-proof paper, in which at least three layers, namely a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c), are co-extrusion laminated as polyethylene resin layers between the paper layer (A) and the paper layer (B) on the paper layer (A) side, thereby joining the paper layer (A) and the paper layer (B).
本発明によれば、優れた防湿性を有するため、様々な用途で使用可能な防湿紙を提供することができる。 The present invention provides moisture-proof paper that has excellent moisture-proofing properties and can be used for a variety of purposes.
＜ポリエチレン樹脂層＞
本発明は、紙層の片面に、又は紙層（Ａ）と紙層（Ｂ）の間にポリエチレン樹脂層を設けた防湿紙である。
ポリエチレン樹脂層は、紙層側又は紙層（Ａ）側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層有し、これらの層が共押出ラミネートにより積層された層である。
<Polyethylene resin layer>
The present invention is a moisture-proof paper having a polyethylene resin layer provided on one side of a paper layer or between paper layers (A) and (B).
The polyethylene resin layer has at least three layers, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c) from the paper layer side or the paper layer (A) side, and these layers are laminated by coextrusion lamination.
ポリエチレン樹脂は、その密度から０．９４２ｇ／ｃｍ３以上の高密度ポリエチレン樹脂と０．９４２ｇ／ｃｍ３未満の低密度ポリエチレン樹脂に大別できる。
ポリエチレン樹脂層に高密度ポリエチレン樹脂を用いることで防湿性が高まることが知られている。ポリエチレン樹脂層の厚みを変更することなく、防湿性を更に高めることは困難であったが、高密度ポリエチレン樹脂層中に密度の異なる低密度ポリエチレン樹脂層を設けることで著しく防湿性が向上する。単一の高密度ポリエチレン樹脂層にくらべ、低密度ポリエチレン樹脂層を内部に有する構成が防湿性に富む理由としては、おそらく房湿度結晶性の異なるポリエチレン樹脂層が積層された構造が防湿効果を奏しているものと考えられる。なお、高密度ポリエチレン樹脂と低密度ポリエチレン樹脂を混合した層では、防湿性は低下する。
Polyethylene resins can be roughly classified into high density polyethylene resins having a density of 0.942 g/cm 3 or more and low density polyethylene resins having a density of less than 0.942 g/cm 3 .
It is known that moisture-proofing is improved by using high-density polyethylene resin in the polyethylene resin layer. It has been difficult to further improve moisture-proofing without changing the thickness of the polyethylene resin layer, but providing a low-density polyethylene resin layer with a different density in the high-density polyethylene resin layer significantly improves moisture-proofing. The reason why a structure having a low-density polyethylene resin layer inside has better moisture-proofing than a single high-density polyethylene resin layer is probably because the structure in which polyethylene resin layers with different tuft moisture crystallinity are laminated provides a moisture-proofing effect. Note that the moisture-proofing is reduced in a layer in which high-density polyethylene resin and low-density polyethylene resin are mixed.
低密度ポリエチレン樹脂層（ｂ）を形成する樹脂としては、密度が９４２ｋｇ/ｍ３未満のポリエチレン樹脂を使用するが、中でも、０．９３０ｇ／ｃｍ３未満のポリエチレン樹脂が防湿性に優れるので好ましい。高密度ポリエチレン樹脂層（ａ）、（ｃ）を形成する樹脂としては、密度が０．９４２ｇ／ｃｍ３以上のポリエチレン樹脂を使用する。高密度ポリエチレン樹脂層（ａ）と（ｃ）は、同じ樹脂成分であることが同時に樹脂を調製できるので好ましい。 As the resin forming the low-density polyethylene resin layer (b), a polyethylene resin having a density of less than 942 kg/ m3 is used, among which a polyethylene resin having a density of less than 0.930 g/ cm3 is preferred because of its excellent moisture resistance. As the resin forming the high-density polyethylene resin layers (a) and (c), a polyethylene resin having a density of 0.942 g/ cm3 or more is used. It is preferred that the high-density polyethylene resin layers (a) and (c) are made of the same resin component, since the resins can be prepared simultaneously.
ポリエチレン樹脂としては、それぞれの層の密度を満足すればよく、化石燃料由来のポリエチレン樹脂でも、バイオマス由来のポリエチレン樹脂でも使用できる。循環型社会の構築を考慮すると、バイオマス由来のポリエチレン樹脂を配合することが好ましい。
バイオマス由来のポリエチレン樹脂とは、バイオマス由来のエチレンを含むモノマーが重合してなるポリエチレンを含んでなる樹脂である。バイオマス由来のエチレンの製造方法は、特に限定されず、従来公知の方法により得ることができる。例えば、木材、トウモロコシ、サトウキビ、ビートなど植物原料から得られるバイオマス由来の発酵エタノール を得、この発酵エタノールよりエチレンを得ることができる。
なお、ポリエチレン樹脂層には、本発明の効果を損なわない範囲で他の成分を配合してもよい。
As the polyethylene resin, it is sufficient that the density of each layer is satisfied, and either a fossil fuel-derived polyethylene resin or a biomass-derived polyethylene resin can be used. Considering the construction of a recycling-based society, it is preferable to blend a biomass-derived polyethylene resin.
The biomass-derived polyethylene resin is a resin containing polyethylene obtained by polymerizing a monomer containing ethylene derived from biomass. The method for producing biomass-derived ethylene is not particularly limited, and it can be obtained by a conventionally known method. For example, fermented ethanol derived from biomass obtained from plant raw materials such as wood, corn, sugarcane, and beet can be obtained, and ethylene can be obtained from this fermented ethanol.
The polyethylene resin layer may contain other components within the range that does not impair the effects of the present invention.
ポリエチレン樹脂層は、高密度ポリエチレン樹脂層（ａ）／低密度ポリエチレン樹脂層（ｂ）／高密度ポリエチレン樹脂層（ｃ）の３層以上を有することが必要である。例えば、高密度ポリエチレン樹脂層（ａ）／低密度ポリエチレン樹脂層（ｂ）／高密度ポリエチレン樹脂層（ｃ）／低密度ポリエチレン樹脂層（ｂ）／高密度ポリエチレン樹脂層（ｃ）の５層のような層構成も含まれる。また、ポリエチレン樹脂層は、紙層に共押出ラミネートにより積層すると、紙層と高密度ポリエチレン樹脂層の密着性、ポリエチレン樹脂層各層の境界面の密着性が優れるので好ましい。 The polyethylene resin layer must have three or more layers, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c). For example, a five-layer structure, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), a high-density polyethylene resin layer (c), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c), is also included. In addition, it is preferable to laminate the polyethylene resin layer to the paper layer by coextrusion lamination, since this provides excellent adhesion between the paper layer and the high-density polyethylene resin layer, and excellent adhesion at the interface between each layer of the polyethylene resin layer.
ポリエチレン樹脂層の厚みは特に限定しないが、防湿性を得るためには２０μｍ以上が好ましく、２５μｍ以上がより好ましい。上限については、厚いほど防湿性に優れることになるが、袋、箱などの成形加工適正を考慮すると、４０μｍ以下が好ましく、３８μｍ以下がより好ましい。その中で、低密度ポリエチレン樹脂層の厚みが全ポリエチレン樹脂層の厚みの２０％以上、４０％以下であると防湿性が優れるために好ましい。 The thickness of the polyethylene resin layer is not particularly limited, but in order to obtain moisture resistance, it is preferably 20 μm or more, and more preferably 25 μm or more. As for the upper limit, the thicker the layer, the better the moisture resistance, but in consideration of the suitability for molding into bags, boxes, etc., it is preferably 40 μm or less, and more preferably 38 μm or less. Of these, it is preferable for the thickness of the low-density polyethylene resin layer to be 20% or more and 40% or less of the thickness of the entire polyethylene resin layer, as this provides excellent moisture resistance.
＜紙層＞
紙層には、公知の紙基材が使用できる。例えば、未晒クラフト紙、半晒クラフト紙、晒クラフト紙、片艶クラフト紙、上質紙、アート紙、コート紙などの紙、白板紙、色板紙、黄色板紙、チップボールなどの板紙が適宜使用できる。紙層（Ａ）、紙層（Ｂ）をポリエチレン樹脂層で接合する場合、紙層（Ａ）と紙層（Ｂ）は、同じ紙基材であっても、異なる紙基材であってもよい。用途に合わせて紙厚を組み合わせるとよい。また、紙層のポリエチレン樹脂と接する面は、予めコロナ処理を施すとポリエチレン樹脂の密着性を高めることができる。
<Paper layer>
A known paper base material can be used for the paper layer. For example, paper such as unbleached kraft paper, semi-bleached kraft paper, bleached kraft paper, one-sided gloss kraft paper, fine paper, art paper, coated paper, and paperboard such as white paperboard, colored paperboard, yellow paperboard, and chipboard can be appropriately used. When the paper layer (A) and the paper layer (B) are joined with a polyethylene resin layer, the paper layer (A) and the paper layer (B) may be the same paper base material or different paper base materials. It is advisable to combine the paper thicknesses according to the application. In addition, the surface of the paper layer that contacts the polyethylene resin can be subjected to a corona treatment in advance to increase the adhesion of the polyethylene resin.
＜防湿紙＞
本発明の防湿紙は、紙層の片面にポリエチレン樹脂層として、紙層側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層有する構成である。用途については特に限定するものではないが、例えばポリエチレン樹脂層を内側にした包装袋等として使用することができる。紙層から最も離れた高密度ポリエチレン層（ｃ）は、シーラント機能を有していてもよい。或いは、高密度ポリエチレン層（ｃ）の表面に、更にシーラント樹脂層を設けてもよい。シーラント機能を有すると、袋に加工する適性が優れた防湿紙となる。
また、本発明の防湿紙は、紙層（Ａ）の片面に高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層からなるポリエチレン樹脂層と、紙層（Ｂ）を有する構成である。用途については特に限定するものではないが、紙厚が大きくなり、包装箱等として使用することができる。紙層（Ａ）又は紙層（Ｂ）のポリエチレン樹脂層と接しない面に、顔料塗工層を施してもよい。なお、ポリエチレン樹脂層と接する面に顔料塗工層を有していても構わない。
なお、本発明の防湿紙のうち防湿性に大きく寄与するのはポリエチレン樹脂層であり、上記少なくとも３層構造を採用することで、顕著な防湿効果を奏するものである。
<Moisture-proof paper>
The moisture-proof paper of the present invention has at least three polyethylene resin layers on one side of a paper layer, the polyethylene resin layers being a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c) from the paper layer side. There are no particular limitations on the uses, but the paper can be used, for example, as a packaging bag with the polyethylene resin layers on the inside. The high-density polyethylene layer (c) furthest from the paper layer may have a sealant function. Alternatively, a sealant resin layer may be further provided on the surface of the high-density polyethylene layer (c). When the paper has a sealant function, the moisture-proof paper has excellent suitability for processing into bags.
The moisture-proof paper of the present invention has a polyethylene resin layer consisting of at least three layers, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c), on one side of the paper layer (A), and a paper layer (B). There are no particular limitations on the use, but the paper becomes thick and can be used as a packaging box, etc. A pigment coating layer may be applied to the surface of the paper layer (A) or the paper layer (B) that is not in contact with the polyethylene resin layer. It is also acceptable to have a pigment coating layer on the surface in contact with the polyethylene resin layer.
In addition, it is the polyethylene resin layer that contributes greatly to the moisture-proofing properties of the moisture-proof paper of the present invention, and by adopting the above-mentioned at least three-layer structure, a remarkable moisture-proofing effect is achieved.
＜透湿度＞
本発明の防湿紙のＪＩＳ Ｚ－０２０８に規定されるカップ法Ｂ法に基づいて測定される透湿度は１３ｇ ／ｍ２・２４ｈｒ以下であることが好ましく、１２ｇ ／ｍ２・２４ｈｒ以下であることがより好ましい。
<Moisture permeability>
The moisture permeability of the moisture-proof paper of the present invention, measured based on the cup method B specified in JIS Z-0208, is preferably 13 g/m 2 ·24 hr or less, and more preferably 12 g/m 2 ·24 hr or less.
本発明を下記実施例によってさらに具体的に説明するが、勿論本発明の範囲はこれらによって限定されるものではない。 The present invention will be explained in more detail with reference to the following examples, but the scope of the present invention is not limited to these examples.
「材料の準備」
紙基材（Ａ）
コート白ボール（王子マテリア製、坪量４５０ｇ／ｍ２）を用意した。
紙基材（Ｂ）
未晒クラフト紙（王子マテリア製、坪量１００ｇ／ｍ２）を用意した。
高密度ポリエチレン樹脂
石油由来の高密度ポリエチレン（商品名：ＬＷ１３Ｄ、東ソー株式会社製、密度：０．９５６ｇ／ｃｍ３、ＭＦＲ：１４ｇ／１０分）を用意した。
低密度ポリエチレン樹脂
バイオマス由来の直鎖状低密度ポリエチレン（商品名：ＳＢＣ８１８、Ｂｒａｓｋｅｍ社製、バイオマス度：９５％以上、密度：０．９１８ｇ／ｃｍ３、ＭＦＲ：８．３ｇ／１０分）を用意した。
"Preparing the materials"
Paper base material (A)
A coated white ball (manufactured by Oji Materia, basis weight 450 g/m 2 ) was prepared.
Paper base material (B)
Unbleached craft paper (manufactured by Oji Materia, basis weight 100 g/m 2 ) was prepared.
High Density Polyethylene Resin Petroleum-derived high density polyethylene (product name: LW13D, manufactured by Tosoh Corporation, density: 0.956 g/cm 3 , MFR: 14 g/10 min) was prepared.
Low-Density Polyethylene Resin: A biomass-derived linear low-density polyethylene (product name: SBC818, manufactured by Braskem, biomass ratio: 95% or more, density: 0.918 g/cm 3 , MFR: 8.3 g/10 min) was prepared.
実施例１
紙基材（Ａ）の裏面（顔料塗工量の少ない面）と、紙基材（Ｂ）を、ポリエチレン樹脂層として高密度ポリエチレン樹脂、低密度ポリエチレン樹脂、高密度ポリエチレン樹脂の３層を共押出ラミネートすることで接合し、防湿紙を得た。なお、ポリエチレン樹脂層は、高密度ポリエチレン樹脂（１１μｍ）、低密度ポリエチレン樹脂（６．５μｍ）、高密度ポリエチレン樹脂（１１μｍ）であった。また、紙層のポリエチレン樹脂層と接合する面には、予めコロナ処理を施した。
Example 1
The back surface (the surface with a small amount of pigment coating) of the paper substrate (A) and the paper substrate (B) were bonded by co-extrusion lamination of three layers of polyethylene resin, namely, high density polyethylene resin, low density polyethylene resin, and high density polyethylene resin, to obtain moisture-proof paper. The polyethylene resin layers were high density polyethylene resin (11 μm), low density polyethylene resin (6.5 μm), and high density polyethylene resin (11 μm). The surface of the paper layer to be bonded to the polyethylene resin layer was previously subjected to corona treatment.
比較例１
紙基材（Ａ）の裏面（顔料塗工量の少ない面）と、紙基材（Ｂ）を、ポリエチレン樹脂層として高密度ポリエチレン樹脂を押出ラミネートすることで接合し、防湿紙を得た。ポリエチレン樹脂層は２８．５μｍであった。また、紙層のポリエチレン樹脂層と接合する面には、予めコロナ処理を施した。
Comparative Example 1
The back surface (the surface with a small amount of pigment coating) of the paper substrate (A) and the paper substrate (B) were bonded by extrusion lamination of a high-density polyethylene resin as a polyethylene resin layer to obtain a moisture-proof paper. The polyethylene resin layer was 28.5 μm. In addition, the surface of the paper layer to be bonded to the polyethylene resin layer was previously subjected to a corona treatment.
比較例２
紙基材（Ａ）の裏面（顔料塗工量の少ない面）と、紙基材（Ｂ）を、ポリエチレン樹脂層として高密度ポリエチレン樹脂８０％、低密度ポリエチレン樹脂２０％の混合樹脂を用いて押出ラミネートすることで接合し、防湿紙を得た。ポリエチレン樹脂層は２８．５μｍであった。また、紙層のポリエチレン樹脂層と接合する面には、予めコロナ処理を施した。
Comparative Example 2
The back surface (the surface with a small amount of pigment coating) of the paper substrate (A) and the paper substrate (B) were bonded by extrusion lamination using a mixed resin of 80% high density polyethylene resin and 20% low density polyethylene resin as a polyethylene resin layer to obtain a moisture-proof paper. The polyethylene resin layer was 28.5 μm thick. The surface of the paper layer to be bonded to the polyethylene resin layer was previously subjected to a corona treatment.
得られた防湿紙の透湿度を、下記の測定方法で測定し、その結果を表１に示す。
＜ 測定方法＞
透湿度：ＪＩＳ Ｚ－０２０８（カップ法）Ｂ法に順じて４０℃、９０％（ＲＨ）で、紙基材（Ｂ）を外側にして測定した。なお、値が小さい方が防湿性に優れる。
The moisture permeability of the resulting moisture-proof paper was measured by the following measurement method. The results are shown in Table 1.
<Measurement method>
Moisture permeability: Measured at 40° C. and 90% (RH) with the paper base material (B) facing outward in accordance with JIS Z-0208 (cup method) Method B. The smaller the value, the better the moisture resistance.
ポリエチレン樹脂層が高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の層構成である実施例１の防湿紙が、優れた防湿性を示すのに対し、高密度ポリエチレン樹脂層のみの比較例１、高密度ポリエチレン樹脂に低密度ポリエチレン樹脂を混合した比較例２は、実施例１と同じ厚みの防湿紙であるが、防湿性が劣るものであった。なお、上記実施例では、ポリエチレン樹脂層の両面に紙層を有する構成であるが、防湿性の寄与はポリエチレン樹脂層が大きく寄与しているので、紙層が片面のみであっても、同様の効果を示すものである。 The moisture-proof paper of Example 1, in which the polyethylene resin layer is composed of a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b), and a high-density polyethylene resin layer (c), exhibits excellent moisture-proof properties, whereas Comparative Example 1, which has only a high-density polyethylene resin layer, and Comparative Example 2, in which high-density polyethylene resin is mixed with low-density polyethylene resin, are moisture-proof papers of the same thickness as Example 1, but have inferior moisture-proof properties. Note that in the above examples, the polyethylene resin layer is configured to have paper layers on both sides, but since the polyethylene resin layer contributes greatly to the moisture-proof properties, the same effect is exhibited even if the paper layer is on only one side.
Claims (7)
前記ポリエチレン樹脂層が、紙層（Ａ）側より高密度ポリエチレン樹脂層（ａ）、低密度ポリエチレン樹脂層（ｂ）、高密度ポリエチレン樹脂層（ｃ）の少なくとも３層有する層である防湿紙。 A moisture-proof paper having a polyethylene resin layer between a paper layer (A) and a paper layer (B),
The moisture-proof paper has at least three polyethylene resin layers, from the paper layer (A) side, namely, a high-density polyethylene resin layer (a), a low-density polyethylene resin layer (b) and a high-density polyethylene resin layer (c).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021013380A JP7524781B2 (en) | 2021-01-29 | 2021-01-29 | Moisture-proof paper and method for producing moisture-proof paper |
| JP2024068710A JP7790468B2 (en) | 2021-01-29 | 2024-04-19 | Moisture-proof paper and method for manufacturing moisture-proof paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021013380A JP7524781B2 (en) | 2021-01-29 | 2021-01-29 | Moisture-proof paper and method for producing moisture-proof paper |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2024068710A Division JP7790468B2 (en) | 2021-01-29 | 2024-04-19 | Moisture-proof paper and method for manufacturing moisture-proof paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2022116948A JP2022116948A (en) | 2022-08-10 |
| JP7524781B2 true JP7524781B2 (en) | 2024-07-30 |
Family
ID=82749691
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021013380A Active JP7524781B2 (en) | 2021-01-29 | 2021-01-29 | Moisture-proof paper and method for producing moisture-proof paper |
| JP2024068710A Active JP7790468B2 (en) | 2021-01-29 | 2024-04-19 | Moisture-proof paper and method for manufacturing moisture-proof paper |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2024068710A Active JP7790468B2 (en) | 2021-01-29 | 2024-04-19 | Moisture-proof paper and method for manufacturing moisture-proof paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JP7524781B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001171063A (en) | 1999-12-17 | 2001-06-26 | Dainippon Printing Co Ltd | Moisture-proof decorative sheet and method for producing the same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120454A (en) * | 1982-12-28 | 1984-07-12 | 出光石油化学株式会社 | Laminate |
| JPH07205972A (en) * | 1994-01-18 | 1995-08-08 | Dainippon Printing Co Ltd | Paper container |
| JP3305897B2 (en) * | 1994-11-17 | 2002-07-24 | 日本製紙株式会社 | Liquid paper container |
| US5712006A (en) * | 1995-09-13 | 1998-01-27 | International Paper Company | Non-foil polymer coated carton for packaging food and non-food products |
| FI117622B (en) | 2001-07-13 | 2006-12-29 | Stora Enso Oyj | Polymer-coated packaging material for heat sealing, its method of preparation and its use for a sealed package |
| JP2004010067A (en) | 2002-06-04 | 2004-01-15 | Nihon Tetra Pak Kk | Packaging material, packaging container and method of manufacturing packaging material |
| US20060177641A1 (en) | 2005-02-09 | 2006-08-10 | Breese D R | Multilayer polyethylene thin films |
| BR112019000233A2 (en) | 2016-07-08 | 2019-04-16 | Constantia Pirk Gmbh & Co. Kg | recyclable polyethylene film |
-
2021
- 2021-01-29 JP JP2021013380A patent/JP7524781B2/en active Active
-
2024
- 2024-04-19 JP JP2024068710A patent/JP7790468B2/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001171063A (en) | 1999-12-17 | 2001-06-26 | Dainippon Printing Co Ltd | Moisture-proof decorative sheet and method for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022116948A (en) | 2022-08-10 |
| JP2024097797A (en) | 2024-07-19 |
| JP7790468B2 (en) | 2025-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2925524B1 (en) | A method for manufacturing a packaging material | |
| CN116745125B (en) | Recyclable cardboard packaging material comprising a metallized barrier layer applied by transfer metallization | |
| US6720046B2 (en) | Low scalping laminate for packaging material | |
| CN101875420A (en) | A barrier laminated packaging material | |
| CN102481763A (en) | Barrier coated thermo-mechanically stable, heat sealable film, a packaging laminate comprising the film, a packaging container formed from the packaging laminate and a method for the production of the film | |
| US10040273B2 (en) | Method for manufacturing a packaging material | |
| WO2002060625A3 (en) | Oxygen barrier laminates having a layer of an evoh/polyolefin blend | |
| US20080280117A1 (en) | Coextruded Blown Films of Polylactide and Polyolefins | |
| JP6241112B2 (en) | Sealant film | |
| AU2022311574B2 (en) | A laminate of multilayer films and process thereof | |
| JP2014509564A (en) | Improved complex system for packaging | |
| JP7524781B2 (en) | Moisture-proof paper and method for producing moisture-proof paper | |
| KR102207230B1 (en) | pouch film for liquor packaging | |
| JP7095792B2 (en) | Laminate for gas barrier | |
| KR20230141090A (en) | Eco-friendly packing material and manufacturing method thereof | |
| KR101867877B1 (en) | Packaging film and method for manufacturing the same | |
| JP7302704B2 (en) | Gas barrier laminate | |
| JP3125368B2 (en) | Manufacturing method of gas barrier laminate packaging material | |
| JP2020055303A (en) | Laminate for hand-cut opening package having sealant layer containing plant-derived polyethylene | |
| JP6984302B2 (en) | Foaming laminate and foaming laminate | |
| JPH0241411B2 (en) | ||
| JP2004230748A (en) | Moistureproof paperboard and paperboard box for powder detergent | |
| RU2021103072A (en) | AQUEOUS DISPERSION OF ETHYLENE-VINYL ALCOHOL COPOLYMER AND OXYGEN-RESISTANT MULTILAYER FILM COATED FROM THE DISPERSION ABOVE | |
| JP2016165810A (en) | Method for producing foam laminate, and the foam laminate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20230619 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20240227 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20240305 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20240419 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20240618 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20240701 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7524781 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |