JP2007039093A - Paper lid for container - Google Patents

Paper lid for container Download PDF

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JP2007039093A
JP2007039093A JP2005226337A JP2005226337A JP2007039093A JP 2007039093 A JP2007039093 A JP 2007039093A JP 2005226337 A JP2005226337 A JP 2005226337A JP 2005226337 A JP2005226337 A JP 2005226337A JP 2007039093 A JP2007039093 A JP 2007039093A
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paper
container
lid
paper lid
peripheral side
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Yoshiyuki Asayama
良行 浅山
孝政 ▲船▼見
Takamasa Funemi
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New Oji Paper Co Ltd
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Oji Paper Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper lid for container, which is formed from a single sheet of paper as a base material, has excellent shape retention and appearance, and high productivity, and is provided with projections formed inside of the circular side of the lid fitted with the opening of the container fits so as to prevent the paper lid from being easily detached from the opening of the food container. <P>SOLUTION: The paper lid for the container, which includes a top plate 1 and a circular side 2 integrally extending almost vertically from the peripheral edge of the top plate is obtained by draw-molding a blank sheet consisting of the single sheet of paper as the base material. In the paper lid for the container, lines of projections are formed on the internal face of the circular side 2 by an embossing process so that they are approximately identical in height. In addition, a corrugated frill 7 is formed at the lower edge of the peripheral side 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、アイスクリームやジャム、ヨーグルト等の紙カップ、その他の容器に使用する紙の蓋であり、特に、1枚の紙基材からなるブランクシートを絞り成形することによって得られる容器用紙蓋に関する。   The present invention relates to a paper lid used for paper cups such as ice cream, jam and yogurt, and other containers, and more particularly to a container paper lid obtained by drawing a blank sheet made of a single paper substrate. .

上述の容器に使用する蓋としては、従来、プラスチック製の蓋が広く使用されている。この容器包装の廃棄物は、廃棄処分時に、資源ごみとして再利用できるものは再利用し、また、廃棄処分費用の高いプラスチックゴミと紙ゴミとに分別し、さらにプラスチックゴミは環境に対する負荷が大きいので、これを減量化する必要がある。しかし使用済みのプラスチック蓋は、資源ごみとしてリサイクルしにくいため、分別されずに他の紙ゴミと一緒に捨てられているのが実情である。
そこで、環境問題、リサイクル問題、省資源を考慮して、前述のプラスチック蓋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紙パルプを素材とする容器用紙蓋が、近年、特に求められている。
Conventionally, plastic lids have been widely used as the lids used for the containers described above. Waste from this container and packaging can be reused as waste when it is disposed of, and is separated into plastic waste and paper waste that are expensive to dispose of, and plastic waste has a large environmental impact. So this needs to be reduced. However, since used plastic lids are difficult to recycle as resource waste, the fact is that they are discarded together with other paper waste without being separated.
Therefore, in consideration of environmental problems, recycling problems, and resource saving, it can be recycled as an alternative to the plastic lid described above, has low calorie calories when discarded, has biodegradability, and has a low environmental impact. In recent years, a container paper lid made of low paper pulp has been particularly demanded.

アイスクリーム、ジャム、ヨーグルト等のカップ状食品容器の開口部に嵌合する紙の蓋は、例えば、特許文献1に例示するように、従来から存在する。しかし、上述の紙製のものは、天板部と周側部の2ピースを組み合わせてなる構成であるから生産性が悪いという問題がある。   A paper lid that fits into an opening of a cup-shaped food container such as ice cream, jam, or yogurt has conventionally existed, as exemplified in Patent Document 1, for example. However, the above-mentioned paper-made one has a problem that productivity is poor because it has a configuration in which two pieces of the top plate portion and the peripheral side portion are combined.

本出願人は、先に1枚の紙ブランクを使用し、これを加熱下でプレス成形して天板と、前記天板の周縁から略垂直方向に一体に延びる周側部を形成した容器用紙蓋を提案している(例えば、特許文献2参照)。しかるに、上述の紙製蓋は、周側部下端を内側に折り返して二重構造にしているので生産性が悪いという欠点がある。しかも周側部を二重にしないと、一般的には周側部の形状が安定し難く、蓋として持続的に使用することができない。   The present applicant previously used a sheet of paper blank, and press-molded this under heating to form a top plate and a container sheet in which a peripheral side portion extending integrally in a substantially vertical direction from the periphery of the top plate is formed. A lid has been proposed (see, for example, Patent Document 2). However, the above-mentioned paper lid has a disadvantage that productivity is poor because the lower end of the peripheral side portion is folded inward to form a double structure. In addition, unless the peripheral side portion is doubled, generally the shape of the peripheral side portion is difficult to stabilize and cannot be used continuously as a lid.

また、紙蓋が容器の開口部から簡単に外れぬように、紙蓋の周側部内側に容器の開口部が嵌合する突起を設けることがある。そしてこのような突起を紙蓋の周側部内側に、複数個の進退するピンで押圧成形する装置も既に提案されている(例えば特許文献3参照)。
しかるに、この紙蓋成形装置により加工した紙蓋の大きな問題点は、成形ピンの押圧(図8a参照)により生じた紙ブランクの陥没により、蓋周側面の高さ方向(上下方向)に波を打ったような変形作用(歪)として現れ(ヒケとも呼ばれ、図8bに↑で示す)、その波打ち現象のために成形後の製品の周側面下端部は外観が悪化し、美粧性が劣るという問題が発生していた。
実公昭56−51017号公報 特開2003−128104号公報 特開2002−307578号公報
In addition, a protrusion that fits the opening of the container may be provided inside the peripheral side of the paper lid so that the paper lid does not easily come off from the opening of the container. An apparatus for press-molding such protrusions on the inner side of the peripheral side portion of the paper lid with a plurality of advancing and retracting pins has already been proposed (see, for example, Patent Document 3).
However, a major problem with the paper lid processed by this paper lid molding device is that a wave is generated in the height direction (vertical direction) of the side surface of the lid due to the depression of the paper blank caused by pressing of the molding pin (see FIG. 8a). Appears as a deformation action (strain) as if it was struck (also called sink, indicated by ↑ in FIG. 8b). Due to the wavy phenomenon, the lower end of the peripheral side surface of the molded product is deteriorated in appearance and inferior in cosmetics. The problem that occurred.
Japanese Utility Model Publication No. 56-51017 JP 2003-128104 A JP 2002-307578 A

かかる実情に鑑み、本発明の目的は、1枚の紙基材からなるブランクシートを絞り成形することによって得られる容器用紙蓋であり、形状安定性、美粧性に優れ、かつ生産性にも優れていると同時に紙蓋が食品容器の開口部から簡単に外れぬように、蓋の周側部内側に容器の開口部が嵌合する突起を設けた容器用紙蓋を提供することである。   In view of such circumstances, an object of the present invention is a container paper lid obtained by drawing a blank sheet made of a single paper base material, and has excellent shape stability, cosmetics, and productivity. At the same time, it is to provide a container paper lid provided with a protrusion that fits the opening of the container inside the peripheral side of the lid so that the paper lid does not easily come off from the opening of the food container.

本発明は上記課題を解決するために以下の構成をとる。
すなわち本発明の第1は、一枚の紙基材からなるブランクシートを絞り成形することによって、天板と、前記天板の周縁から略垂直方向に一体に延びる周側部を形成した容器用紙蓋において、
前記周側部の内面に、筋状突出部をエンボス加工により設け、かつ前記周側部の下縁に波形フリルを設けたことを特徴とする容器用紙蓋である。
The present invention adopts the following configuration in order to solve the above problems.
That is, according to the first aspect of the present invention, a container sheet in which a blank sheet made of a single sheet of paper substrate is drawn to form a top plate and a peripheral side portion extending integrally in a substantially vertical direction from the periphery of the top plate. In the lid,
A container paper lid, wherein a streak-like protruding portion is provided on an inner surface of the peripheral side portion by embossing, and a corrugated frill is provided on a lower edge of the peripheral side portion.

また本発明の第2は、前記周側部に、1〜20mmの間隔で押罫線が設けられており、前記筋状突出部は、前記押罫線の2本以上と交差するように形成されていることを特徴とする本発明の第1に記載の容器用紙蓋である。   According to a second aspect of the present invention, a ruled line is provided on the peripheral side portion at an interval of 1 to 20 mm, and the streak-like protruding portion is formed so as to intersect with two or more of the ruled line. The container paper lid according to the first aspect of the present invention.

さらに本発明の第3は、筋状突出部が複数であることを特徴とする前記第1〜第2発明のいずれかに記載の容器用紙蓋である。   Furthermore, a third aspect of the present invention is the container sheet lid according to any one of the first and second aspects, wherein the plurality of line-like protrusions are provided.

本発明の第4は、天板の中央に、ドーム状突出部を設けたことを特徴とする本発明の第1〜第3のいずれかに記載の容器用紙蓋である。   A fourth aspect of the present invention is the container sheet lid according to any one of the first to third aspects of the present invention, wherein a dome-shaped protrusion is provided at the center of the top plate.

そして本発明の第5は、紙基材は、米坪が100〜500g/m2、密度が0.4〜0.7g/cm3、破断伸びが1.5%以上であることを特徴とする本発明の第1〜4のいずれかに記載の容器用紙蓋である。 The fifth aspect of the present invention is characterized in that the paper base has a rice basis weight of 100 to 500 g / m 2 , a density of 0.4 to 0.7 g / cm 3 , and a breaking elongation of 1.5% or more. The container paper lid according to any one of the first to fourth aspects of the present invention.

本発明によれば、一枚の紙基材から絞り成形によって、形状安定性、美粧性に優れ、さらに生産性に優れ、また紙蓋が食品容器の開口部から簡単に外れぬように、蓋の周側部内側に容器の開口部が嵌合する突起を設けた容器用紙蓋を得ることが可能である。   According to the present invention, the lid is formed by drawing from a single paper substrate so that the shape stability and cosmetics are excellent, the productivity is excellent, and the paper lid does not easily come off from the opening of the food container. It is possible to obtain a container paper lid provided with a protrusion that fits the opening of the container on the inner side of the peripheral side.

以下、本発明を具体的に説明する。
図1〜図3は本発明の紙蓋の一例を示すものであって、図1は斜視図、図2は断面図、図3は容器の開口周縁部に、本発明の紙蓋Aの周側部が嵌合した状態を示す部分断面図である。図4は成形前の紙蓋のブランクを示し、略円板形状に形成されている。この円板の外周には後述するように波形状のフリルが形成されている。ブランク形状は円状に限られず、楕円形、角形、そのほか多角形であってもよく、容器の形状に応じて種々の形に設計できる。
なお図中、1は中央の天板、2は天板1に連続して周側部2がある高さを持って外側垂直方向に形成されている。ここで紙蓋Aの天板1は中央がドーム状に盛り上がった形状になっている。ドーム状突出部3の形は、蓋成形用金型により様々の形状に成形することが可能であって、図3のように外輪に平坦部4aを有するもの、後述する図5に示すように、外輪に溝部4bを有するものを例示したが、これに限るものではない。
The present invention will be specifically described below.
1 to 3 show an example of the paper cover of the present invention. FIG. 1 is a perspective view, FIG. 2 is a cross-sectional view, and FIG. 3 is the periphery of the opening of the container. It is a fragmentary sectional view which shows the state which the side part fitted. FIG. 4 shows a blank of the paper lid before molding, which is formed in a substantially disc shape. As will be described later, wave-shaped frills are formed on the outer periphery of the disk. The blank shape is not limited to a circular shape, and may be an elliptical shape, a rectangular shape, or a polygonal shape, and can be designed in various shapes according to the shape of the container.
In the figure, reference numeral 1 denotes a central top plate, and 2 is formed in the vertical direction outside with a height at which the peripheral side portion 2 is continuous to the top plate 1. Here, the top plate 1 of the paper lid A has a shape in which the center rises like a dome. The shape of the dome-shaped protrusion 3 can be formed into various shapes by a lid molding die, and has a flat portion 4a on the outer ring as shown in FIG. 3, as shown in FIG. 5 described later. Although an example in which the outer ring has the groove 4b is illustrated, the present invention is not limited to this.

なお、天板の中央にドーム状突出部3を設けた場合には、蓋の形状安定性が向上する。同時に、特にアイスクリーム等の氷菓に使用する際には、通常、前記氷菓は、流動体として容器の中心部中央から充填されるが、粘性のある流動体であること、また、冷凍により体積が膨張することによって、中央部が盛り上がった形になりやすい。従って、蓋の中央部にドーム状の突出部を設けることによって、氷菓の表面が盛り上がった状態になったとしても、蓋をかぶせる際に、盛り上がりによって蓋が浮くことがない。また、内容物が蓋に付着することもなく、製品の外観を損うことがない、という効果がある。また、図のような外輪に設けた平坦部や溝部を利用して、本発明の紙蓋Aを被せた容器を上下方向に複数個積み重ねた時に、平坦部や溝部の上に、上方の容器の底が安定よく載置できるので、容器運搬時の取扱いに便利となる。   In addition, when the dome-shaped protrusion 3 is provided at the center of the top plate, the shape stability of the lid is improved. At the same time, particularly when used for ice confectionery such as ice cream, the ice confectionery is usually filled from the center of the container as a fluid, but it is a viscous fluid and has a volume due to freezing. By expanding, the central part tends to rise. Therefore, even if the surface of the ice confection is raised by providing the dome-shaped protrusion at the center of the lid, the lid does not float due to the rise when the lid is covered. Moreover, there is an effect that the contents do not adhere to the lid and the appearance of the product is not impaired. Further, when a plurality of containers covered with the paper lid A of the present invention are stacked in the vertical direction using the flat part or groove part provided in the outer ring as shown in the figure, the upper container is placed on the flat part or groove part. Since the bottom of the container can be placed stably, it is convenient for handling during container transportation.

符号Bは容器を示し、その材質は紙、プラスチック等何でもよいが、蓋Aの材質は、紙の両面または片面に、熱可塑性樹脂をラミネートした紙基材から構成されている。具体的に述べると、ブランク主体である紙層が、絞り成形時に紙切れするのを防ぐために、伸張性能のよい原紙を使用するのがよい。このような原紙としては、例えばカップ原紙(コップ原紙いうことがある)が挙げられる。ここで、カップ原紙とは、晒化学パルプを原料として、強サイズが施されて円網あるいは長網抄紙機により抄造されたものをいい、上質紙、晒クラフト紙に近い紙質のものいう。紙の坪量は、特には限定しないが、本発明で使用する成形加工用原紙の坪量の好適範囲は100〜500g/m2の範囲、さらに、望ましい坪量は250〜420g/m2である。500g/m2以上の高米坪の場合は、絞り成形が困難となり、また成形した蓋の外観がしわの目立つものになってしまうおそれがある。100g/m2以下低米坪の場合は、腰が無くなり、この場合も成形困難となる。また、成形後の紙製蓋の形状が安定しない恐れがある。 Reference numeral B denotes a container, and the material thereof may be any material such as paper or plastic. The material of the lid A is made of a paper base material in which a thermoplastic resin is laminated on both sides or one side of the paper. Specifically, in order to prevent the paper layer, which is mainly a blank, from being cut during drawing, it is preferable to use a base paper having good stretchability. Examples of such base paper include cup base paper (sometimes referred to as cup base paper). Here, the base paper of the cup means a paper made of bleached chemical pulp as a raw material, which has been subjected to a strong size and made by a circular net or a long net paper machine, and has a quality close to that of high-quality paper and bleached kraft paper. The basis weight of the paper is not particularly limited, but the preferred range of the basis weight of the forming base paper used in the present invention is in the range of 100 to 500 g / m 2 , and the desired basis weight is 250 to 420 g / m 2 . is there. In the case of a high tsubo of 500 g / m 2 or more, drawing molding becomes difficult, and the appearance of the molded lid may become wrinkled. In the case of 100 g / m 2 or less and a low rice floor, the waist is lost, and in this case, molding becomes difficult. Further, the shape of the paper lid after molding may be unstable.

本発明で用いる紙基材の好ましい例は、後述するように、紙層の少なくとも片面が、例えばポリエチレン(PE)又はポリプロピレン(PP)等の熱可塑性樹脂を積層してなるヒートシール可能なラミネート紙である。また紙層と熱可塑性樹脂層との間にさらに一層又は二層以上の層を有することができる。必要に応じて印刷層を紙層と樹脂層との間に設けることができる。印刷層が樹脂と原紙の中間に配置される理由は、絞り成形時に原紙の表面が金型と接触して強くしごかれるために印刷が擦れるために、樹脂の下部に印刷表示を施したものを使用するのがよい。   A preferable example of the paper substrate used in the present invention is a heat-sealable laminated paper in which at least one side of the paper layer is laminated with a thermoplastic resin such as polyethylene (PE) or polypropylene (PP), as will be described later. It is. Further, one or more layers may be provided between the paper layer and the thermoplastic resin layer. If necessary, a printing layer can be provided between the paper layer and the resin layer. The reason why the printing layer is placed between the resin and the base paper is that the surface of the base paper is in contact with the mold and strongly squeezed during drawing, and the printing is rubbed, so that the bottom of the resin is printed. It is good to use.

通常の場合、紙基材として、美麗な印刷済の原紙巻き取りに対し両面PPラミネートをタンデム押し出し機で行った両面ラミネート紙が使用される。押し出し厚さは一例として20μmである。基材の厚さは、原紙厚みと関連するが、樹脂厚みを20〜50μmである場合、0.16〜0.50mm程度、好ましくは0.20〜0.40mm程度である。   In a normal case, double-sided laminated paper obtained by carrying out double-sided PP lamination with a tandem extruder for winding a beautiful printed base paper is used as a paper base. The extrusion thickness is 20 μm as an example. The thickness of the substrate is related to the thickness of the base paper, but when the resin thickness is 20 to 50 μm, it is about 0.16 to 0.50 mm, preferably about 0.20 to 0.40 mm.

本発明の紙蓋Aは、上記の成形加工原紙を原材料として、先ず平判に断裁しその後、後記実施例示すように、所定形状(円形あるいは角形等)に打ち抜くと同時に、押罫線5を中央天板1の周囲の周側部2に定間隔、かつブランクの中心から放射状に付与するように構成されている。この押罫線5は成形時に、紙蓋に生ずるシワをコントロールするものである、すなわち、プレス成形体が歪の大きい曲面部を有する場合、プレス成形時に曲面部分に折りシワを形成させて歪を吸収させる必要がある。このとき折りシワ部分は平面方向にアコーディオンのように折りこまれて凹凸を形成し、その後、プレスによりその凹凸部がブランクの厚さ方向に圧縮される。丸形状の紙蓋のブランクの一例を図4に示す。同図のブランクは、直径94mmに形成された円形ブランクの周側部2に相当する位置に44本の罫線5を、所定間隔(約5mm間隔)で放射状に付与したものである。因みに上記紙基材としては、280g/m2+PPラミ30g/m2、原紙密度は0.60(ラミネート前の原紙)破断は伸び3.2%である成形加工原紙を使用した。 The paper cover A according to the present invention is cut into a flat shape using the above-mentioned shaped processed raw paper as a raw material, and then punched into a predetermined shape (circular or rectangular) as shown in the examples below, and at the same time, the ruled line 5 is centered. It is comprised so that it may give to the peripheral side part 2 around the top plate 1 at regular intervals and radially from the center of the blank. This ruled line 5 controls wrinkles generated in the paper lid during molding. That is, when the press-molded body has a curved surface portion with a large strain, a folded wrinkle is formed on the curved surface portion during press molding to absorb the strain. It is necessary to let At this time, the folded wrinkle portion is folded like an accordion in the plane direction to form irregularities, and then the irregularities are compressed in the thickness direction of the blank by pressing. An example of a blank paper cover blank is shown in FIG. The blank in the figure is one in which 44 ruled lines 5 are radially provided at predetermined intervals (intervals of about 5 mm) at positions corresponding to the peripheral side portion 2 of a circular blank formed with a diameter of 94 mm. Incidentally, as the paper substrate, a molded base paper having 280 g / m 2 + PP lamination 30 g / m 2 , base paper density of 0.60 (base paper before lamination), and breaking elongation of 3.2% was used.

このような押罫線5を付与した紙基材からなるブランクに対して絞り成形を施し、図1、図2に示すように本発明の紙蓋を成形する。このとき、特開2002−307578号のプレス成形装置又は別種のエンボス加工装置を使用して、複数の筋状突出部6を前記周側部2の内面側に押し出すように略同じ高さに設ける。換言すれば、複数の筋状突出部6は、それぞれが、紙蓋の周側部2の母線方向に対して直交する方向に設けられている。因みに、符号7で示すものはフリルであり、
なお、前記筋状突出部6の長さは、周側部を環状に一周する形で設けてもよいが、前記押罫線の2本以上と交差する長さに、定ピッチに形成することが望ましい。このように各筋状突出部6の長さを2本以上の罫線と交差するようにエンボス加工すると、罫線部分が、加圧されることで加締められるため、罫線部が広がりにくくなり、その結果、側壁部分の形状が安定するという効果がある。
Drawing is performed on a blank made of a paper base material to which such ruled lines 5 are applied, and the paper lid of the present invention is formed as shown in FIGS. At this time, using a press molding apparatus disclosed in JP-A No. 2002-307578 or another type of embossing apparatus, the plurality of streak-like protruding portions 6 are provided at substantially the same height so as to be pushed out to the inner surface side of the peripheral side portion 2. . In other words, each of the plurality of streaky protrusions 6 is provided in a direction orthogonal to the generatrix direction of the peripheral side portion 2 of the paper lid. Incidentally, what is denoted by reference numeral 7 is a frill,
In addition, although the length of the said line | wire-like protrusion part 6 may be provided in the form which circles a circumference side part cyclically | annularly, it is formed in the fixed pitch in the length which cross | intersects two or more of the said ruled line. desirable. In this way, when the embossing process is performed so that the length of each line-like protruding portion 6 intersects with two or more ruled lines, the ruled line portions are crimped by being pressurized, so that the ruled line portions are not easily spread. As a result, there is an effect that the shape of the side wall portion is stabilized.

図5〜図7は本発明の紙蓋の別例を示すものであって、図5は斜視図、図6は右側面図、図7は断面図であり、図1〜3と同一の符号を付した部分は同一物を表わしている。   5 to 7 show other examples of the paper cover of the present invention. FIG. 5 is a perspective view, FIG. 6 is a right side view, and FIG. 7 is a cross-sectional view. The parts marked with indicate the same thing.

<蓋の素材について>
本発明の上記した形態において、紙蓋に対して実用的に必要な剛性を付与し、絞り成形後の曲面部での破断を抑止するためには、紙蓋を構成する素材として低密度で強度の高い成形加工原紙を使用する必要がある。こうした成形加工原紙を得るためには、紙に使用するパルプとしてリグニンを多量に残留させた機械パルプを含有することが好ましい。なお、機械パルプ使用の有無を判定する手段としては、例えばTAPPI T401−os−74記載の方法で機械パルプを検出することが可能である。また、成形加工原紙に使用する紙中の機械パルプ使用量としては5〜100質量%の範囲が好ましく、さらに好ましくは20〜80質量%での範囲で、最も好ましくは40〜70質量%の範囲である。機械パルプが5質量%以上の場合、成形加工原紙が低密度化させることができるので好ましい。また成形加工原紙に特に伸長性を持たせたい場合には機械パルプ使用量を80質量%以下、好ましくは70質量%以下とすることが好ましい。なお、紙中の機械パルプ使用量は、TAPPI T−401−os−74に記載された手段を用いて規定することができ、具体的には以下の方法をとる。まず、成形加工原紙を水または熱水で再離解する。次に、この再離解したパルプ繊維をスライドグラス上に分散させ、C染色液、Herzberg染色液、Sellegen染色液等のパルプ染色液を滴下してパルプ繊維を染色する。その後、上記スライドを顕微鏡で観察してパルプ繊維の染色性、形態的特徴に基づいて繊維組成を判別する。この時、同時にスライドを規則的に走査しながら、一定面積当たりに存在するパルプ繊維を各種別ごとに計数し、重み係数によって質量百分率に換算する。
<About the material of the lid>
In the above-described embodiment of the present invention, in order to give practically necessary rigidity to the paper lid and to prevent breakage at the curved surface portion after the drawing, the material constituting the paper lid has a low density and strength. It is necessary to use a highly processed paper. In order to obtain such a molded base paper, it is preferable to contain mechanical pulp in which a large amount of lignin remains as pulp used for paper. In addition, as a means to determine the presence or absence of mechanical pulp use, it is possible to detect mechanical pulp by the method of TAPPI T401-os-74, for example. Further, the amount of mechanical pulp used in the paper used for forming processed paper is preferably in the range of 5 to 100% by mass, more preferably in the range of 20 to 80% by mass, and most preferably in the range of 40 to 70% by mass. It is. When the mechanical pulp is 5% by mass or more, the molded base paper can be reduced in density, which is preferable. In addition, when it is desired to give the forming base paper particularly extensibility, the amount of mechanical pulp used is preferably 80% by mass or less, and preferably 70% by mass or less. In addition, the amount of mechanical pulp used in paper can be defined using the means described in TAPPI T-401-os-74, and specifically, the following method is taken. First, the processed base paper is re-disaggregated with water or hot water. Next, the re-disaggregated pulp fibers are dispersed on a slide glass, and pulp fibers such as C stain solution, Herzberg stain solution, and Sellegen stain solution are dropped to stain the pulp fibers. Thereafter, the slide is observed with a microscope to determine the fiber composition based on the dyeability and morphological characteristics of the pulp fiber. At this time, while simultaneously scanning the slide at the same time, the pulp fibers present per certain area are counted for each type and converted into mass percentages by weighting factors.

前記した絞り成形後の紙蓋の物性を実現するためには、成形加工原紙に使用する紙の米坪が100〜500g/m2、密度が0.4〜0.7g/cm3、破断伸びが1.5%以上であることが好ましい。さらに、密度0.7〜0.9g/cm3である高密度層を少なくとも一層、及び、密度が0.2〜0.6g/cm3の少なくとも一層の低密度層を有することが好ましい。低密度層の密度は、さらに好ましくは0.3〜0.5g/cm3である。 In order to realize the physical properties of the paper cover after the drawing, the paper used for the forming base paper has a basis weight of 100 to 500 g / m 2 , a density of 0.4 to 0.7 g / cm 3 , and elongation at break. Is preferably 1.5% or more. Furthermore, at least one layer high density layer is the density 0.7~0.9g / cm 3, and a density preferably has at least one layer of a low density layer of 0.2 to 0.6 g / cm 3. The density of the low density layer is more preferably 0.3 to 0.5 g / cm 3 .

以上の構成にすることにより、前記した米坪が100〜500g/m2、密度が0.4〜0.7g/cm3、破断伸びが1.5%以上である紙が得られる。伸びを1.5%以上にするために、必要であれば、外層に繊維長が長いNBKPを配合し、適切な叩解度まで叩解して使用することが可能である。 By adopting the above configuration, a paper having the above-mentioned rice basis weight of 100 to 500 g / m 2 , density of 0.4 to 0.7 g / cm 3 , and elongation at break of 1.5% or more is obtained. In order to increase the elongation to 1.5% or more, if necessary, NBKP having a long fiber length can be blended in the outer layer, and beating to an appropriate beating degree can be used.

成形加工原紙に使用する紙としては、紙蓋の外側となる側の外層を構成する原料パルプとして、該原料パルプを単層で抄紙した場合の破断伸びが3%以上となる原料を使用することがさらに望ましい。(この単層抄紙条件はTAPPI標準法による。)紙蓋の外側となる側の紙層は、絞り成形時に内側よりも多く延伸されるため、内側よりもさらに強い破断伸びが必要とされるが、このように外側に延伸しやすいパルプ原料を使用することによって、絞り成形における外側の紙層表面のひび割れ、破れを防止し、より深い絞り成形を可能とするものである。なお、成形加工原紙に使用する紙の破断伸びの調整は、前記と同様、繊維長の長いNBKPを配合し、叩解の程度を調節するなどの公知の方法で可能である。   As the paper used for the forming processed paper, as the raw material pulp constituting the outer layer on the outer side of the paper lid, a raw material having a breaking elongation of 3% or more when the raw pulp is made in a single layer is used. Is more desirable. (This single-layer papermaking condition is based on the TAPPI standard method.) Since the paper layer on the outer side of the paper lid is stretched more than the inner side at the time of draw forming, a stronger elongation at break than the inner side is required. Thus, by using a pulp raw material that is easily stretched to the outside, cracking and tearing of the outer paper layer surface in the drawing can be prevented, and deep drawing can be performed. The breaking elongation of the paper used for the forming base paper can be adjusted by a known method such as blending NBKP having a long fiber length and adjusting the degree of beating as described above.

<成形加工原紙の塗工層について>
本発明における成形加工原紙には、必要に応じてその片面、あるいは両面に顔料と接着剤からなる塗工層を設けることができる。前記塗工層に用いられる顔料としては、炭酸カルシウム、カオリン、クレー、タルク、酸化チタン、プラスチックピグメント等既知のものが任意に使用できる。前記塗工層に用いられる接着剤としては、澱粉、カゼイン、SBRラテックス、ポリビニルアルコールなど既知のものが任意に使用できる。これらの塗工層は単層、あるいは多層に形成することができる。またその塗工量は全体で20〜30g/m2程度が望ましい。また、このような塗工層を設ける場合は、塗工層直下の層は、叩解度を高め、表面をより平滑にしておくことがさらに好ましい。このような塗工層は、公知である各種の塗工装置を適宜用いて塗工することができる。また、このような塗工層の上に、さらに印刷層を設けることが可能である。
<Coating layer of forming base paper>
The forming base paper in the present invention can be provided with a coating layer composed of a pigment and an adhesive on one side or both sides as required. As the pigment used in the coating layer, known pigments such as calcium carbonate, kaolin, clay, talc, titanium oxide, and plastic pigment can be arbitrarily used. As the adhesive used for the coating layer, known ones such as starch, casein, SBR latex, and polyvinyl alcohol can be arbitrarily used. These coating layers can be formed in a single layer or multiple layers. The total coating amount is preferably about 20 to 30 g / m 2 . Further, when such a coating layer is provided, it is more preferable that the layer immediately below the coating layer has a higher beating degree and a smoother surface. Such a coating layer can be applied by appropriately using various known coating apparatuses. Moreover, it is possible to provide a printing layer further on such a coating layer.

<成形方法について>
本発明紙蓋の製造方法としては、成形加工原紙をブランクシートに打ち抜き、必要箇所に罫線を入れ、雄型と雌型よりなるプレス型に該ブランクシートを挟み、加熱、加圧して成形する、いわゆる絞り成形という製造方法をとる。この時、成形加工原紙は、予め調湿し、原紙水分を調節することが必要である。原紙水分は10〜20%の範囲にする必要があり、好ましくは11〜17%、最も好ましくは12〜15%である。ここでいう原紙水分とは、加工原紙中の全パルプ分の絶乾質量に対する、水分の質量%をいう。原紙水分をこの好適範囲とすると、成形加工原紙の可塑化が起こって成形性が向上し、また、成形時の紙層の破壊を低減することができる。この結果、より深さがあり、外観が滑らかで美しく、しかも高い剛性を有した絞り成形品を得ることができる。原紙水分が10%未満であると成形体に十分な剛性が得られず、また20%を越えると、成形加工原紙にブリスターが発生して原紙の紙層が剥離する、水分量が多くなるため乾燥に時間がかかり生産性が落ちる等の問題が発生し好ましくない。なお、原紙水分の調製方法として、プレス成形直前に原紙に水分を供与する方法や、紙の抄造時において、ドライヤーを出た後に加湿し、水分が維持される状態で輸送・保存する方法などが挙げられる。
<About molding method>
As a manufacturing method of the paper lid of the present invention, a forming base paper is punched into a blank sheet, a ruled line is put in a necessary place, the blank sheet is sandwiched between press dies composed of a male mold and a female mold, and heated and pressurized to be molded. A so-called drawing forming method is employed. At this time, it is necessary to condition the moisture of the forming base paper in advance and adjust the water content of the base paper. The base paper moisture needs to be in the range of 10-20%, preferably 11-17%, most preferably 12-15%. The moisture of the base paper here refers to the mass% of the water with respect to the absolute dry mass of the total pulp in the processed base paper. If the moisture content of the base paper is within this preferred range, plasticization of the forming base paper occurs, the formability is improved, and breakage of the paper layer during molding can be reduced. As a result, it is possible to obtain a drawn product having a greater depth, a smooth and beautiful appearance, and high rigidity. If the water content of the base paper is less than 10%, sufficient rigidity cannot be obtained in the molded body. If the base paper content exceeds 20%, blisters are generated on the forming base paper and the paper layer of the base paper is peeled off. It takes time for drying and undesirably causes problems such as reduced productivity. In addition, as a method for preparing moisture of the base paper, there are a method of supplying moisture to the base paper immediately before press molding, a method of transporting and storing in a state where moisture is maintained after moisture is removed from the dryer when paper is made. Can be mentioned.

次に、ブランクシートから紙蓋を製造する工程について説明する。本発明で絞り成形は一対のプレス用金型により行う。一対の加熱プレス用金型とは、凸状で成形品の内容積部に対応する形状の凸型と、凹状で成形品の外形に対応する形状の凹型である。前記一対のプレス用金型は前後または上下方向に少なくとも片方の型が動くことにより成形品をプレスすることができる。   Next, a process for manufacturing a paper lid from a blank sheet will be described. In the present invention, the drawing is performed by a pair of pressing dies. The pair of heating press molds are a convex mold having a convex shape corresponding to the inner volume of the molded product and a concave mold having a concave shape corresponding to the outer shape of the molded product. The pair of pressing dies can press the molded product by moving at least one of the dies in the front-rear or up-down direction.

本発明の紙蓋の一例を示す斜視図である。It is a perspective view which shows an example of the paper cover of this invention. 同上断面図である。It is sectional drawing same as the above. 容器の縁部に本発明の紙蓋が嵌合した状態を示す部分断面図である。It is a fragmentary sectional view which shows the state which the paper lid of this invention fitted to the edge of the container. 紙蓋のブランクの一例を示す平面図である。It is a top view which shows an example of the blank of a paper cover. 本発明の紙蓋の別例を示す斜視図である。It is a perspective view which shows another example of the paper cover of this invention. 同上側面図である。It is a side view same as the above. 同上断面図である。It is sectional drawing same as the above. aは紙蓋成形装置の説明図、bは上記の紙蓋成形装置により加工した紙蓋の変形作用を示す説明図である。a is explanatory drawing of a paper lid forming apparatus, b is explanatory drawing which shows the deformation | transformation effect | action of the paper lid processed by said paper lid forming apparatus.

符号の説明Explanation of symbols

A 紙蓋、B 容器
1 中央の天板
2 周側部
3 ドーム状突出部
4a 平坦部
4b 溝部
5 押罫線
6 筋状突出部
7 波形フリル
A Paper cover, B Container 1 Center top plate 2 Circumferential side 3 Domed protrusion 4a Flat part 4b Groove part 5 Ruled line 6 Line-like protrusion part 7 Wave ruffle

Claims (5)

一枚の紙基材からなるブランクシートを絞り成形することによって、天板と、前記天板の周縁から略垂直方向に一体に延びる周側部を形成した容器用紙蓋において、前記周側部の内面に、筋状突出部をエンボス加工により設け、かつ前記周側部の下縁に波形フリルを設けたことを特徴とする容器用紙蓋。   In the container paper lid formed by drawing a blank sheet made of a single sheet of paper base material, and a peripheral side portion extending integrally in a substantially vertical direction from the peripheral edge of the top plate, the peripheral side portion A container paper lid, wherein a streak-like protruding portion is provided on an inner surface by embossing, and a corrugated frill is provided on a lower edge of the peripheral side portion. 前記周側部に、1〜20mmの間隔で押罫線が設けられており、前記筋状突出部は、前記押罫線の2本以上と交差するように形成されていることを特徴とする請求項1に記載の容器用紙蓋。   The ruled line is provided at an interval of 1 to 20 mm on the peripheral side part, and the streak-like protruding part is formed so as to intersect with two or more of the ruled lines. The container paper lid according to 1. 筋状突出部が複数であることを特徴とする請求項1〜2のいずれかに記載の容器用紙蓋。   The container sheet lid according to claim 1, wherein there are a plurality of line-like protrusions. 天板の中央に、ドーム状突出部を設けたことを特徴とする請求項1〜3のいずれか1項に記載の容器用紙蓋。   The container paper lid according to any one of claims 1 to 3, wherein a dome-shaped protrusion is provided at the center of the top plate. 紙基材は、米坪が100〜500g/m2、密度が0.4〜0.7g/cm3、破断伸びが1.5%以上であることを特徴とする請求項1〜4のいずれか1項に記載の容器用紙蓋。 The paper base has a basis weight of 100 to 500 g / m 2 , a density of 0.4 to 0.7 g / cm 3 , and an elongation at break of 1.5% or more. The container paper lid according to claim 1.
JP2005226337A 2005-08-04 2005-08-04 Paper lid for container Pending JP2007039093A (en)

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US11560673B2 (en) 2019-01-31 2023-01-24 Be Green Packaging Llc Pulp molding production line and processing method thereof

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JP2009298438A (en) * 2008-06-12 2009-12-24 Fukui Yodaru Seisakusho:Kk Paper cylindrical container
JP2012001237A (en) * 2010-06-16 2012-01-05 Nippon Die Steel Kk Preventing corrugated cardboard from wounding hand
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US20140048552A1 (en) * 2012-08-17 2014-02-20 Gaoyuan WANG Pulp molded lid with non-reticulated inner and outer surfaces and process of manufacturing same
US20160319490A1 (en) * 2012-08-17 2016-11-03 Jinhua Gaoyuan Mould & Machinery Co., Ltd Method for Preparing a Pulp Molded Cup Lid with Buckles without Overlapping Curves on Both Surfaces
US9765484B2 (en) * 2012-08-17 2017-09-19 Jinhua Gaoyuan Mould & Machinery Co., Ltd Method for preparing a pulp molded cup lid with buckles without overlapping curves on both surfaces
WO2014026473A1 (en) * 2012-08-17 2014-02-20 Wang Gaoyuan Paper pulp cup lid free of texture on both sides and with snap-fitting
US11497330B2 (en) 2012-08-22 2022-11-15 Ptm Packaging Tools Machinery Pte. Ltd. Paper-based container lids and methods for making the same
US10582787B2 (en) 2012-08-22 2020-03-10 Ptm Packaging Tools Machinery Pte. Ltd. Paper-based container lids and methods for making the same
CN103452008A (en) * 2013-01-16 2013-12-18 王高原 Molded pulp cup lid without overlapping curves on both surfaces and manufacturing method thereof
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EP3741266A4 (en) * 2018-01-16 2021-09-15 Be Green Packaging Co., Ltd. Negative angle pulp molded cup lid
CN108943876A (en) * 2018-09-25 2018-12-07 瑞安市康奇机械有限公司 A kind of paper cap manufacturing equipment
US11560673B2 (en) 2019-01-31 2023-01-24 Be Green Packaging Llc Pulp molding production line and processing method thereof
KR102144397B1 (en) * 2020-04-13 2020-08-12 조인석 Paper lid for disposable containers
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WO2022124383A1 (en) * 2020-12-09 2022-06-16 株式会社Ky7 Lid body
WO2022177022A1 (en) * 2021-02-22 2022-08-25 日本製紙株式会社 Lid
JPWO2022181737A1 (en) * 2021-02-24 2022-09-01
WO2022181737A1 (en) * 2021-02-24 2022-09-01 株式会社Ky7 Lid body

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