JP7455484B2 - Method for manufacturing a laminated container including a paper-blended resin layer - Google Patents

Method for manufacturing a laminated container including a paper-blended resin layer Download PDF

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JP7455484B2
JP7455484B2 JP2020183240A JP2020183240A JP7455484B2 JP 7455484 B2 JP7455484 B2 JP 7455484B2 JP 2020183240 A JP2020183240 A JP 2020183240A JP 2020183240 A JP2020183240 A JP 2020183240A JP 7455484 B2 JP7455484 B2 JP 7455484B2
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隆 宮
大輔 馬場
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Yoshino Kogyosho Co Ltd
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Description

本発明は、紙配合樹脂層を含む積層容器の製造方法に関する。 The present invention relates to a method for manufacturing a laminated container including a paper-blended resin layer.

現在、ＣＯ2削減、環境負荷軽減などの環境適合のために合成樹脂使用量の削減が求められている。このような要求は、口部、肩部、胴部及び底部を有するボトル状又はチューブ状などの容器の製造においても顕著である。その対策として、紙配合樹脂層を含む積層容器をブロー成形によって製造する方法が知られている（例えば、特許文献１参照）。 Currently, there is a need to reduce the amount of synthetic resin used in order to be environmentally friendly, such as reducing CO2 and reducing environmental impact. Such a requirement is also noticeable in the manufacture of containers such as bottles or tubes having a mouth, a shoulder, a body and a bottom. As a countermeasure against this problem, a method is known in which a laminated container including a paper-blended resin layer is manufactured by blow molding (for example, see Patent Document 1).

特開平０５－１４７１７０号公報Japanese Patent Application Publication No. 05-147170

しかしながら、紙配合樹脂層とこれよりも内側に配置されるオレフィン系樹脂層とを含むパリソンを共押し出しして成形型内で押し出しブロー成形する場合、紙配合樹脂のブロー成形時における延伸性がオレフィン系樹脂に比べ著しく乏しく、肩部から胴部にかけての周方向に顕著な延伸ムラが生じ、周方向の偏肉が著しくなり、耐久性、耐落下衝撃性、圧縮強度などに劣る積層容器が製造されてしまう場合があり、改善が望まれていた。 However, when co-extruding a parison containing a paper-blended resin layer and an olefin-based resin layer placed inside the paper-blended resin layer and extrusion blow-molding it in a mold, the stretchability of the paper-blended resin during blow molding is limited to olefin resin. It produces laminated containers that are extremely poor in durability, drop impact resistance, compressive strength, etc., and have remarkable uneven stretching in the circumferential direction from the shoulder to the body, resulting in significant unevenness in circumferential thickness. Improvements were desired.

本発明は、このような問題点を解決することを課題とするものであり、その目的は、肩部から胴部にかけての延伸ムラを抑制することができる、紙配合樹脂層を含む積層容器の製造方法を提供することにある。 The present invention aims to solve these problems, and its purpose is to provide a laminated container including a paper-blended resin layer that can suppress stretching unevenness from the shoulder to the body. The purpose is to provide a manufacturing method.

本発明の紙配合樹脂層を含む積層容器の製造方法は、口部、肩部、胴部及び底部を有し、紙配合樹脂層を含む積層容器の製造方法であって、紙配合樹脂層とこれよりも内側に配置されるＰＥ系樹脂層とを含むパリソンを共押し出しする押し出し工程と、前記パリソンを成形型で挟み潰すことで前記口部から前記肩部にかけてバリを生じさせるバリ出し工程と、前記バリを生じさせた状態で前記パリソンを前記成形型内でブロー成形するブロー成形工程と、前記バリ出し工程以降に成形品本体から前記バリを除去するバリ除去工程と、を有し、前記ブロー成形工程においてブロー比が２倍以下であることを特徴とする。 A method for manufacturing a laminated container including a paper-blended resin layer according to the present invention is a method for producing a laminated container having a mouth, a shoulder, a body, and a bottom, and including a paper-blended resin layer. an extrusion step of co-extruding a parison including a PE-based resin layer disposed on the inner side; and a burr removal step of creating burrs from the mouth part to the shoulder part by crushing the parison with a mold. , comprising a blow molding step of blow molding the parison in the mold with the burr generated, and a burr removal step of removing the burr from the molded product body after the burr removal step; It is characterized in that the blow ratio in the blow molding process is 2 times or less .

本発明の紙配合樹脂層を含む積層容器の製造方法は、上記構成において、前記紙配合樹脂層が、紙成分とＰＰとからなる紙配合樹脂と、ＬＤＰＥとのブレンド樹脂からなるのが好ましい。 In the method for manufacturing a laminated container including a paper-blended resin layer of the present invention, in the above structure, it is preferable that the paper-blended resin layer is made of a blended resin of a paper-blended resin consisting of a paper component and PP, and LDPE.

本発明の紙配合樹脂層を含む積層容器の製造方法は、上記構成において、前記ＰＥ系樹脂層がＬＤＰＥまたはＬＬＤＰＥからなるのが好ましい。 In the method for producing a laminated container including a paper-blended resin layer according to the present invention, in the above structure, it is preferable that the PE-based resin layer is made of LDPE or LLDPE.

本発明の紙配合樹脂層を含む積層容器の製造方法は、上記構成において、前記ＰＥ系樹脂層が植物由来樹脂からなるのが好ましい。 In the method for manufacturing a laminated container including a paper-blended resin layer according to the present invention, in the above configuration, it is preferable that the PE resin layer is made of a plant-derived resin.

本発明の紙配合樹脂層を含む積層容器の製造方法は、上記構成において、前記ブロー成形工程は、前記紙配合樹脂層よりも外側にインモールド成形によって紙ラベルを装着させるインモールド成形工程を含むのが好ましい。 In the method for manufacturing a laminated container including a paper blended resin layer of the present invention, in the above configuration, the blow molding step includes an in-mold molding step of attaching a paper label to an outer side of the paper blended resin layer by in-mold molding. is preferable.

本発明によれば、肩部から胴部にかけての延伸ムラを抑制することができる、紙配合樹脂層を含む積層容器の製造方法を提供することができる。 According to the present invention, it is possible to provide a method for manufacturing a laminated container including a paper-blended resin layer that can suppress stretching unevenness from the shoulder to the body.

本発明の第１実施形態である、紙配合樹脂層を含む積層容器の製造方法において、バリ出し工程を行っている時の状態を示す一部断面上面図である。FIG. 2 is a partially sectional top view showing a state during a burr removal step in the method for manufacturing a laminated container including a paper-blended resin layer, which is the first embodiment of the present invention. 図１に示す状態からブロー成形工程及びバリ除去工程を経て製造された積層容器を示す側面図である。It is a side view which shows the laminated container manufactured from the state shown in FIG. 1 through a blow molding process and a burr removal process. 本発明の第２実施形態である、紙配合樹脂層を含む積層容器の製造方法によって製造された積層容器を示す側面図である。It is a side view which shows the laminated container manufactured by the manufacturing method of the laminated container containing a paper compound resin layer which is 2nd Embodiment of this invention.

以下、図面を参照しつつ本発明の実施形態を例示説明する。 Embodiments of the present invention will be described below by way of example with reference to the drawings.

まず、図１～図２を参照して本発明の第１実施形態について例示説明する。本実施形態である、紙配合樹脂層を含む積層容器の製造方法は、押し出し工程、バリ出し工程（図１参照）、ブロー成形工程及びバリ除去工程を有しており、図２に示すように、口部１、肩部２、胴部３及び底部４を有し、ボトル状をなす積層容器を製造するためのものである。なお、本実施形態により製造される積層容器は、口部１、肩部２、胴部３及び底部４を有していればボトル状に限らず、例えばチューブ状をなすものであってもよい。 First, a first embodiment of the present invention will be exemplified with reference to FIGS. 1 and 2. The method for manufacturing a laminated container including a paper-blended resin layer according to this embodiment includes an extrusion process, a burr removal process (see FIG. 1), a blow molding process, and a burr removal process, as shown in FIG. , a bottle-shaped laminated container having a mouth portion 1, a shoulder portion 2, a body portion 3, and a bottom portion 4. Note that the laminated container manufactured according to this embodiment is not limited to a bottle shape as long as it has a mouth portion 1, a shoulder portion 2, a body portion 3, and a bottom portion 4, and may be, for example, a tube shape. .

なお、本明細書において、上下方向とは口部１の中心軸線Ｏに沿う方向を意味し、上方とは底部４から口部１に向かう方向を意味し、下方とはその反対方向を意味し、径方向とは中心軸線Ｏに垂直な直線に沿う方向を意味し、周方向とは中心軸線Ｏを周回する方向を意味している。 In this specification, the vertical direction means the direction along the central axis O of the mouth 1, the upward means the direction from the bottom 4 to the mouth 1, and the downward means the opposite direction. The radial direction means a direction along a straight line perpendicular to the central axis O, and the circumferential direction means a direction going around the central axis O.

口部１は、中心軸線に沿って延びる円筒状をなしている。図示は省略するが、口部１の外周面は、通常、口部１にキャップなどの部材を取り付けるためのねじ山などの凹凸部を有している。肩部２は、口部１の下端から側方に延びる部分である。胴部３は、肩部２の外周縁から下方に延びる部分である。底部４は、積層容器における口部１と反対側の末端部（下端部）である。本実施形態では、肩部２は、口部１の下端から下方に向けて拡径する円錐面状をなし、胴部３は円筒状をなしているが、これに限らない。例えば、胴部３は楕円筒状や角筒状をなしてもよいし、取っ手部などを有していてもよい。 The mouth portion 1 has a cylindrical shape extending along the central axis. Although not shown in the drawings, the outer circumferential surface of the mouth portion 1 usually has an uneven portion such as a thread for attaching a member such as a cap to the mouth portion 1. The shoulder portion 2 is a portion extending laterally from the lower end of the mouth portion 1. The body portion 3 is a portion extending downward from the outer peripheral edge of the shoulder portion 2. The bottom portion 4 is the end portion (lower end portion) on the opposite side from the mouth portion 1 of the stacked container. In this embodiment, the shoulder portion 2 has a conical shape whose diameter increases downward from the lower end of the mouth portion 1, and the body portion 3 has a cylindrical shape, but the shape is not limited thereto. For example, the body portion 3 may have an elliptical cylinder shape or a rectangular cylinder shape, or may have a handle portion or the like.

押し出し工程は、紙配合樹脂層６とこれよりも内側に配置されるＰＥ系樹脂層７とを含む筒状のパリソン８を共押し出しする工程である。図２にパリソン８の形状を二点鎖線で示す。なお、パリソン８の横断面（水平断面）は真円であるが、これに限らず、例えば楕円でもよい。 The extrusion process is a process of co-extruding a cylindrical parison 8 that includes the paper-compounded resin layer 6 and the PE resin layer 7 disposed on the inner side thereof. In FIG. 2, the shape of the parison 8 is shown by a two-dot chain line. Note that although the cross section (horizontal cross section) of the parison 8 is a perfect circle, it is not limited to this, and may be, for example, an ellipse.

紙配合樹脂層６は、紙成分とポリオレフィン系樹脂とからなる紙配合樹脂を含むことが好ましい。このような紙配合樹脂としては、例えば、株式会社環境経営総合研究所製のＭＡＰＫＡ（登録商標）などが挙げられる。環境適合性と成形性との両立の観点から、紙配合樹脂に含まれる紙成分の割合は、５１～６０重量％であることが好ましい。紙配合樹脂は、吸湿の問題があるため、成形前に例えば８０℃で６時間程度以上の乾燥を行うことが好ましい。つまり、紙配合樹脂は、成形開始時に水分率が５００ｐｐｍ以下程度の乾燥状態であることが好ましい。 It is preferable that the paper compound resin layer 6 contains a paper compound resin consisting of a paper component and a polyolefin resin. Examples of such paper-compounded resins include MAPKA (registered trademark) manufactured by Environmental Management Research Institute Co., Ltd. From the viewpoint of achieving both environmental compatibility and moldability, the proportion of paper components contained in the paper compound resin is preferably 51 to 60% by weight. Paper compound resins have the problem of moisture absorption, so it is preferable to dry them at, for example, 80° C. for about 6 hours or more before molding. In other words, the paper compound resin is preferably in a dry state with a moisture content of about 500 ppm or less at the start of molding.

紙配合樹脂層６は、紙成分とＰＰ（ポリプロピレン）とからなる紙配合樹脂と、ＬＤＰＥ（低密度ポリエチレン）などの柔軟性のあるオレフィン系樹脂とのブレンド樹脂からなることが好ましく、このような構成により、本実施形態のように紙配合樹脂層６よりも内側にＰＥ（ポリエチレン）系樹脂層７を設けた場合でも周方向の延伸ムラを抑制することができる。なお、紙配合樹脂層６は、適宜、相溶性改善などの改質などを目的とする添加剤を含んでよい。環境適合性の観点から、ＬＤＰＥは植物由来樹脂であることが好ましい。 The paper compound resin layer 6 is preferably made of a blend resin of a paper compound resin consisting of paper components and PP (polypropylene) and a flexible olefin resin such as LDPE (low density polyethylene). With this configuration, even when the PE (polyethylene) resin layer 7 is provided inside the paper compound resin layer 6 as in this embodiment, stretching unevenness in the circumferential direction can be suppressed. Note that the paper blended resin layer 6 may contain additives for the purpose of modification such as improving compatibility, as appropriate. From the viewpoint of environmental compatibility, the LDPE is preferably a plant-derived resin.

紙配合樹脂層６のＭＦＲ（メルトフローレート）は、５ｇ／１０ｍｉｎ（２３０℃、２．１６ｋｇ）以下であることが好ましく、より好ましくは、０．６～１．３ｇ／１０ｍｉｎ（２３０℃、２．１６ｋｇ）である。 The MFR (melt flow rate) of the paper blended resin layer 6 is preferably 5g/10min (230°C, 2.16kg) or less, more preferably 0.6 to 1.3g/10min (230°C, 2.16kg) or less. .16 kg).

ＰＥ系樹脂層７は、ＬＤＰＥまたはＬＬＤＰＥ（直鎖状低密度ポリエチレン）からなることが好ましく、このような構成により、周方向の延伸ムラを抑制することができる。環境適合性の観点から、ＰＥ系樹脂層７は、植物由来樹脂であるＬＤＰＥまたはＬＬＤＰＥからなることがより好ましい。 The PE-based resin layer 7 is preferably made of LDPE or LLDPE (linear low-density polyethylene), and such a configuration can suppress stretching unevenness in the circumferential direction. From the viewpoint of environmental compatibility, it is more preferable that the PE resin layer 7 is made of LDPE or LLDPE, which are plant-derived resins.

また、環境適合性の観点から、紙配合樹脂層６の厚さは、ＰＥ系樹脂層７よりも大きいことが好ましい。 Further, from the viewpoint of environmental compatibility, the thickness of the paper compound resin layer 6 is preferably larger than that of the PE resin layer 7.

バリ出し工程は、パリソン８を成形型９で挟み潰すことで口部１から肩部２にかけてバリ５を生じさせる工程である。図２にバリ５の形状を破線と網掛けで示す。 The burr removal step is a step in which the parison 8 is pinched and crushed between the molds 9 to generate burrs 5 from the mouth portion 1 to the shoulder portion 2. In FIG. 2, the shape of the burr 5 is shown by broken lines and hatching.

図１に示すように、成形型９は、パリソン８を側方から挟み込むことができる割り型で構成され、内部に容器形状に対応する形状の成形面１０（キャビティ形成面）を有している。図１では成形型９はパーティングライン１１を境に側方に２つの部分型９ａに分割されている。成形面１０は、口部１を成形する部分である口部成形面１０ａと、肩部２を成形する部分である肩部成形面１０ｂと、胴部３を成形する部分である胴部成形面１０ｃと、を含んでいる。 As shown in FIG. 1, the mold 9 is composed of a split mold that can sandwich the parison 8 from the sides, and has a molding surface 10 (cavity forming surface) having a shape corresponding to the shape of the container inside. . In FIG. 1, the mold 9 is laterally divided into two partial molds 9a with a parting line 11 as a boundary. The molding surface 10 includes a mouth molding surface 10a that is a part that molds the mouth part 1, a shoulder molding surface 10b that is a part that molds the shoulder part 2, and a trunk molding surface that is a part that molds the body part 3. 10c.

図１～図２に示すように、口部成形面１０ａは、パリソン８の外径Ｄ１よりも小さい外径Ｄ２を有する。なお、本実施形態では口部成形面１０ａはパリソン８と同軸に配置されているが、口部成形面１０ａをパリソン８に対して偏心させて配置してもよい。 As shown in FIGS. 1 and 2, the mouth molding surface 10a has an outer diameter D2 smaller than the outer diameter D1 of the parison 8. As shown in FIGS. In this embodiment, the mouth molding surface 10a is arranged coaxially with the parison 8, but the mouth molding surface 10a may be arranged eccentrically with respect to the parison 8.

口部成形面１０ａと肩部成形面１０ｂとは、パーティングライン１１に沿って、口部成形面１０ａから肩部成形面１０ｂにかけて延びる隙間で構成される逃げ部１２を有している。パリソン８を口部成形面１０ａと肩部成形面１０ｂとで挟み潰すことで、パリソン８の一部を逃げ部１２内に逃がし、バリ５とすることができる。つまり、逃げ部１２は、パリソン８を成形型９で挟み潰すことで口部１から肩部２にかけてバリ５を生じさせる隙間である。本実施形態では、逃げ部１２は、口部成形面１０ａの上端から肩部成形面１０ｂの径方向中間部までに跨る部分に設けられている。 The mouth molding surface 10a and the shoulder molding surface 10b have a relief part 12 that is formed by a gap extending along the parting line 11 from the mouth molding surface 10a to the shoulder molding surface 10b. By pinching and crushing the parison 8 between the mouth molding surface 10a and the shoulder molding surface 10b, a part of the parison 8 can escape into the relief part 12 and become the burr 5. In other words, the relief portion 12 is a gap in which the parison 8 is crushed between the mold 9 and the burr 5 is generated from the mouth portion 1 to the shoulder portion 2. In the present embodiment, the relief portion 12 is provided in a portion spanning from the upper end of the mouth molding surface 10a to the radially intermediate portion of the shoulder molding surface 10b.

逃げ部１２は、中心軸線Ｏを挟んで互いに対向する２つの部分１２ａで構成されている。これに対応し、バリ５は、中心軸線Ｏを挟んで互いに対向する２つの部分５ａで構成されている。なお、成形型９を側方に３つの部分型９ａに分割した構成とし、逃げ部１２を３つの部分１２ａで構成し、それにより、バリ５を３つの部分５ａで構成してもよい。 The relief portion 12 is composed of two portions 12a facing each other with the central axis O in between. Correspondingly, the burr 5 is composed of two portions 5a facing each other with the central axis O in between. The mold 9 may be laterally divided into three partial molds 9a, the relief portion 12 may be formed from three portions 12a, and the burr 5 may be formed from three portions 5a.

ブロー成形工程は、バリ５を生じさせた状態でパリソン８を成形型９内でブロー成形する工程である。 The blow molding step is a step in which the parison 8 is blow molded in a mold 9 with burrs 5 formed.

ブロー成形工程では、バリ５を生じさせた状態でパリソン８をブロー成形することにより、延伸材料の周方向の膨張を抑制することができ、肩部２から胴部３にかけての周方向に生じる延伸ムラを抑制することができる。 In the blow molding process, by blow molding the parison 8 with burrs 5 formed, expansion of the stretched material in the circumferential direction can be suppressed, and the stretching generated in the circumferential direction from the shoulder section 2 to the body section 3 can be suppressed. Unevenness can be suppressed.

このような延伸ムラの抑制効果をより確実に得るためには、ブロー成形工程におけるブロー比を２倍以下とすることが好ましい。つまり、円筒状のパリソン８から円筒状の胴部３を形成する場合、胴部３の最大外径Ｄ３はパリソンの外径Ｄ１の２倍以下とすることが好ましい。 In order to more reliably obtain the effect of suppressing such stretching unevenness, it is preferable that the blow ratio in the blow molding step is 2 times or less. That is, when forming the cylindrical body 3 from the cylindrical parison 8, the maximum outer diameter D3 of the body 3 is preferably twice or less the outer diameter D1 of the parison.

バリ除去工程は、バリ出し工程以降に成形品本体からバリ５を除去する工程である。バリ除去工程は、バリ出し工程と同時に行ってもよい。例えば、バリ除去工程は、成形型９の逃げ部１２の基端部に設けられた刃（図示省略）によって型締めと同時に成形品本体からバリ５を切り離す工程であってもよい。また、バリ除去工程は、ブロー成形工程の後に行ってもよい。例えば、バリ除去工程は、成形型９から成形品を取り出した後に成形品本体からバリ５を除去する工程であってもよい。 The burr removal process is a process of removing burrs 5 from the molded product body after the burr removal process. The burr removal step may be performed simultaneously with the burr removal step. For example, the burr removal step may be a step in which the burr 5 is separated from the molded product body at the same time as the mold is clamped using a blade (not shown) provided at the base end of the relief portion 12 of the mold 9. Further, the burr removal step may be performed after the blow molding step. For example, the burr removal step may be a step of removing burrs 5 from the molded product body after the molded product is removed from the mold 9.

バリ５の除去は、成形型９の型開き前に成形型９内で行ってもよいし、型開き後に成形型９の外部で行ってもよい。押し出し工程、バリ出し工程、ブロー成形工程及びバリ除去工程を経ることにより、積層容器を得ることができる。 The burr 5 may be removed within the mold 9 before the mold 9 is opened, or may be removed outside the mold 9 after the mold 9 is opened. A laminated container can be obtained through an extrusion process, a burr removal process, a blow molding process, and a burr removal process.

以上説明したように、本実施形態によれば、口部１から肩部２にかけてバリ５を生じさせた状態でパリソン８をブロー成形することにより、肩部２から胴部３にかけての周方向に生じる延伸ムラを抑制し、その結果、肩部２から胴部３にかけて周方向の偏肉が抑制された、優れた耐久性、耐落下衝撃性、圧縮強度などを有する、紙配合樹脂層６を含む積層容器を得ることができる。 As explained above, according to the present embodiment, by blow molding the parison 8 with burrs 5 formed from the mouth portion 1 to the shoulder portion 2, the parison 8 is formed in the circumferential direction from the shoulder portion 2 to the body portion 3. The paper-blended resin layer 6 has excellent durability, drop impact resistance, compressive strength, etc., which suppresses the uneven stretching that occurs and, as a result, suppresses uneven thickness in the circumferential direction from the shoulder portion 2 to the body portion 3. It is possible to obtain a laminated container containing.

なお、本実施形態では、口部１の上端から肩部２の径方向中間部までに跨る部分にバリ５を生じさせているが、バリ５を生じさせる範囲（つまり逃げ部１２を設ける範囲）は、口部１から肩部２にかけての範囲であれば、パリソン８の材質や容器形状などに応じて適宜設定することができる。 In addition, in this embodiment, the burr 5 is generated in the part extending from the upper end of the mouth part 1 to the radial middle part of the shoulder part 2, but the range where the burr 5 is produced (that is, the range where the relief part 12 is provided) is can be set as appropriate depending on the material of the parison 8, the shape of the container, etc., as long as it is within the range from the mouth portion 1 to the shoulder portion 2.

次に、図３を参照して本発明の第２実施形態について例示説明する。本実施形態である、紙配合樹脂層を含む積層容器の製造方法は、ブロー成形工程が、紙配合樹脂層６よりも外側にインモールド成形によって紙ラベル１３を装着させるインモールド成形工程を含む点のみにおいて、第１実施形態と相違している。なお、図３において、第１実施形態の要素に対応する要素に同一の符号を付している。 Next, a second embodiment of the present invention will be illustrated with reference to FIG. The method of manufacturing a laminated container including a paper-blended resin layer according to the present embodiment has the point that the blow molding step includes an in-mold molding step of attaching a paper label 13 to the outside of the paper-blended resin layer 6 by in-mold molding. This embodiment differs from the first embodiment only in this respect. Note that in FIG. 3, elements corresponding to those of the first embodiment are given the same reference numerals.

紙ラベル１３の装着は、ラベル内側に接着層を設けることで行ってもよいし、例えば特許６１２０７５５号に記載されるように、ラベル端部と胴部表面との絡み合いにより行ってもよい。また、紙ラベル１３の接着性を高めるために、紙配合樹脂層６と紙ラベル１３との間に、ＰＥ系樹脂層などの他の樹脂層を設けてもよい。 The paper label 13 may be attached by providing an adhesive layer inside the label, or by intertwining the end of the label with the surface of the body, as described in, for example, Japanese Patent No. 6,120,755. Further, in order to improve the adhesiveness of the paper label 13, another resin layer such as a PE resin layer may be provided between the paper compound resin layer 6 and the paper label 13.

本実施形態のように、紙ラベル１３を設けることにより、容器全体としての紙比率を高め、環境適合性を高めることができる。また、胴部３の剛性が大きくなるため、流通過程において潰れにくくなり、合成樹脂使用量を減らすことができる。また、容器が紙として廃棄可能になる５１重量％以上の紙比率の達成をより容易にすることができる。 By providing the paper label 13 as in this embodiment, it is possible to increase the paper ratio of the container as a whole and improve environmental compatibility. Furthermore, since the body portion 3 has increased rigidity, it is less likely to be crushed during the distribution process, and the amount of synthetic resin used can be reduced. Furthermore, it is possible to more easily achieve a paper ratio of 51% by weight or more, which allows the container to be disposed of as paper.

本発明は前記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。 The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof.

したがって、前記実施形態の紙配合樹脂層を含む積層容器の製造方法は、例えば以下に述べるような種々の変更が可能である。 Therefore, the method for manufacturing a laminated container including the paper-blended resin layer of the embodiment described above can be modified in various ways, such as those described below.

前記実施形態の紙配合樹脂層を含む積層容器の製造方法は、口部１、肩部２、胴部３及び底部４を有し、紙配合樹脂層６を含む積層容器の製造方法であって、紙配合樹脂層６とこれよりも内側に配置されるＰＥ系樹脂層７とを含むパリソン８を共押し出しする押し出し工程と、パリソン８を成形型９で挟み潰すことで口部１から肩部２にかけてバリ５を生じさせるバリ出し工程と、バリ５を生じさせた状態でパリソン８を成形型９内でブロー成形するブロー成形工程と、バリ出し工程以降に成形品本体からバリ５を除去するバリ除去工程と、を有する限り、種々変更可能である。 The method for manufacturing a laminated container including a paper-blended resin layer according to the embodiment is a method for manufacturing a laminated container that has a mouth portion 1, a shoulder portion 2, a body portion 3, and a bottom portion 4, and includes a paper-blended resin layer 6. , an extrusion process of co-extruding a parison 8 including a paper blended resin layer 6 and a PE resin layer 7 disposed inside the paper compound resin layer 6, and a molding die 9 to crush the parison 8 to form a shape from the mouth part 1 to the shoulder part. 2 to generate burrs 5; a blow molding step in which the parison 8 is blow-molded in a mold 9 with burrs 5 formed; and burrs 5 are removed from the molded product body after the burr removal step. Various modifications are possible as long as the process includes a burr removal step.

しかし、ブロー成形工程においてブロー比は２倍以下であるのが好ましい。 However, it is preferable that the blow ratio in the blow molding process is 2 times or less.

また、紙配合樹脂層６は、紙成分とＰＰとからなる紙配合樹脂と、ＬＤＰＥ等の柔軟性のあるオレフィン系樹脂とのブレンド樹脂からなるのが好ましい。 The paper-blended resin layer 6 is preferably made of a blend of a paper-blended resin made of paper components and PP, and a flexible olefin-based resin such as LDPE.

また、ＰＥ系樹脂層７はＬＤＰＥまたはＬＬＤＰＥからなるのが好ましい。 Moreover, it is preferable that the PE resin layer 7 is made of LDPE or LLDPE.

また、ＰＥ系樹脂層７は植物由来樹脂からなるのが好ましい。 Moreover, it is preferable that the PE-based resin layer 7 is made of a plant-derived resin.

また、ブロー成形工程は、紙配合樹脂層６よりも外側にインモールド成形によって紙ラベル１３を装着させるインモールド成形工程を含むのが好ましい。 The blow molding process preferably includes an in-mold molding process in which a paper label 13 is attached to the outside of the paper-blended resin layer 6 by in-mold molding.

１ 口部
２ 肩部
３ 胴部
４ 底部
５ バリ
５ａ バリの部分
６ 紙配合樹脂層
７ ＰＥ系樹脂層
８ パリソン
９ 成形型
９ａ 部分型
１０ 成形面
１０ａ 口部成形面
１０ｂ 肩部成形面
１０ｃ 胴部成形面
１１ パーティングライン
１２ 逃げ部
１２ａ 逃げ部の部分
１３ 紙ラベル
Ｄ１ パリソンの外径
Ｄ２ 口部成形面の外径
Ｄ３ 胴部の最大外径 1 Mouth 2 Shoulder 3 Body 4 Bottom 5 Burr 5a Burr portion 6 Paper compound resin layer 7 PE resin layer 8 Parison 9 Molding mold 9a Partial mold 10 Molding surface 10a Mouth molding surface 10b Shoulder molding surface 10c Body Part molding surface 11 Parting line 12 Relief part 12a Relief part 13 Paper label D1 Outer diameter of parison D2 Outer diameter of mouth molding surface D3 Maximum outer diameter of body

Claims (5)

口部、肩部、胴部及び底部を有し、紙配合樹脂層を含む積層容器の製造方法であって、
紙配合樹脂層とこれよりも内側に配置されるＰＥ系樹脂層とを含むパリソンを共押し出しする押し出し工程と、
前記パリソンを成形型で挟み潰すことで前記口部から前記肩部にかけてバリを生じさせるバリ出し工程と、
前記バリを生じさせた状態で前記パリソンを前記成形型内でブロー成形するブロー成形工程と、
前記バリ出し工程以降に成形品本体から前記バリを除去するバリ除去工程と、を有し、
前記ブロー成形工程においてブロー比が２倍以下であることを特徴とする方法。 A method for manufacturing a laminated container having a mouth, a shoulder, a body, and a bottom, and including a paper-blended resin layer, the method comprising:
an extrusion step of co-extruding a parison including a paper-compounded resin layer and a PE-based resin layer disposed inside the paper-blended resin layer;
a burr removal step of creating burrs from the mouth portion to the shoulder portion by crushing the parison with a mold;
a blow molding step of blow molding the parison in the mold with the burrs formed;
a burr removal step of removing the burr from the molded product body after the burr removal step ;
A method characterized in that the blow ratio in the blow molding step is 2 times or less . 前記紙配合樹脂層が、紙成分とＰＰとからなる紙配合樹脂と、ＬＤＰＥとのブレンド樹脂からなる、請求項１に記載の方法。 The method according to claim 1, wherein the paper-blended resin layer is made of a blended resin of a paper-blended resin made of a paper component and PP, and LDPE. 前記ＰＥ系樹脂層がＬＤＰＥまたはＬＬＤＰＥからなる、請求項１または２に記載の方法。 The method according to claim 1 or 2, wherein the PE-based resin layer is made of LDPE or LLDPE. 前記ＰＥ系樹脂層が植物由来樹脂からなる、請求項３に記載の方法。 The method according to claim 3, wherein the PE-based resin layer is made of a plant-derived resin. 前記ブロー成形工程は、前記紙配合樹脂層よりも外側にインモールド成形によって紙ラベルを装着させるインモールド成形工程を含む、請求項１～４の何れか１項に記載の方法。 The method according to any one of claims 1 to 4, wherein the blow molding step includes an in-mold molding step of attaching a paper label to an outside of the paper compound resin layer by in-mold molding.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002293317A (en) 2001-03-30 2002-10-09 Yoshino Kogyosho Co Ltd Container made of composite material
JP2014234443A (en) 2013-05-31 2014-12-15 株式会社吉野工業所 Cellulose-containing container
JP2015199514A (en) 2014-04-07 2015-11-12 株式会社クレハ Synthetic resin-made blow-molded multilayer container having cut-off support part and surface layer containing plant-derived ethylene-based polyolefin resin

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002293317A (en) 2001-03-30 2002-10-09 Yoshino Kogyosho Co Ltd Container made of composite material
JP2014234443A (en) 2013-05-31 2014-12-15 株式会社吉野工業所 Cellulose-containing container
JP2015199514A (en) 2014-04-07 2015-11-12 株式会社クレハ Synthetic resin-made blow-molded multilayer container having cut-off support part and surface layer containing plant-derived ethylene-based polyolefin resin

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