JP2005343099A - Mold for preform of multilayer container - Google Patents

Mold for preform of multilayer container Download PDF

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Publication number
JP2005343099A
JP2005343099A JP2004167907A JP2004167907A JP2005343099A JP 2005343099 A JP2005343099 A JP 2005343099A JP 2004167907 A JP2004167907 A JP 2004167907A JP 2004167907 A JP2004167907 A JP 2004167907A JP 2005343099 A JP2005343099 A JP 2005343099A
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preform
gate
mold
forming
core layer
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Masaki Onoe
正樹 尾上
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NIPPON PARISON KK
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NIPPON PARISON KK
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C2045/2872—Closure devices therefor consisting of needle valve systems with at least three positions, e.g. two different open positions to control the melt flow

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  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for a preform of a multilayer container, which can accurately control so as for a core layer located in the center part to take a predetermined position. <P>SOLUTION: In the mold for the preform of the multilayer container which molds the preform 1 by successively injecting molten resins for forming the core layer 1a and the outside and inside skin layers 1b, 1c into the cavity through the gate 5 while opening/closing the gate 5 by the operation of the valve stem 6, the gate length (L) is set in the range of 15-30 mm. It is preferable to make the draft of the gate 5 to be 3° or smaller. Further, it is preferable to set both of the arc diameter (A) of the gate root portion and the arc diameter (B) passing the three points of the bottom center portion of the preform and the gate root portion to 5 mm or smaller. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、中心部にあるコア層を所定の位置となるように正確に制御することができる多層容器用プリフォームの成形型に関するものである。   The present invention relates to a mold for a preform for a multi-layer container that can be accurately controlled so that a core layer in a central portion is in a predetermined position.

従来から、各種の飲料や食料用容器としてポリエチレンテレフタレート（ＰＥＴ）樹脂よりなる容器が広く使用されている。また最近では、ガスバリア性や耐熱性等を向上させる目的で中心部にコア層と称される組成の異なる樹脂からなる層を設けた多層容器が開発され使用に供されている（例えば、特許文献１を参照）。更には、加熱した状態で保管されるホット製品に用いられる多層容器の場合、容器内の酸素を捉えるとともに容器外の酸素侵入を防止する目的でバリア材をコア層に入れることも行われている。   Conventionally, containers made of polyethylene terephthalate (PET) resin have been widely used as various beverage and food containers. Recently, for the purpose of improving gas barrier properties, heat resistance, etc., a multilayer container provided with a layer made of a resin having a different composition called a core layer at the center has been developed and used (for example, patent documents). 1). Furthermore, in the case of a multilayer container used for a hot product stored in a heated state, a barrier material is also placed in the core layer for the purpose of capturing oxygen inside the container and preventing oxygen from entering outside the container. .

前記多層容器を成形する場合、例えばコア層とその内外面にあるスキン層の３層からなる多層容器用プリフォームが用いられている。このような多層容器用プリフォームは、コア層が所定の位置に正確にあることが必要であり、従来はコア層の位置制御を射出のタイミングをタイマーやピストンの射出位置でコントロールしていた。しかしながら、使用する樹脂の種類や状態等により、コア層が本来目的とする位置からズレてしまう現象が発生する場合があった。この結果、プリフォームをブロー成形した際に、樹脂の延びが異なって成形体の肉厚にばらつきを生じ、製品欠陥になるというという問題点があった。また、このような肉厚にばらつきのあるプリフォームは検査工程で除外しているが、これがプリフォーム製造における成形効率を低下させる大きな要因となっていた。
特開昭６３−４９３２号公報 When the multilayer container is molded, for example, a multilayer container preform including a core layer and a skin layer on the inner and outer surfaces thereof is used. Such a preform for a multi-layer container requires the core layer to be accurately at a predetermined position. Conventionally, the position control of the core layer is controlled by the timing of injection and the injection position of the piston. However, depending on the type and state of the resin used, there may be a phenomenon that the core layer is displaced from the originally intended position. As a result, there is a problem that when the preform is blow-molded, the resin stretches differently, resulting in variations in the thickness of the molded body, resulting in product defects. In addition, preforms with such a variation in thickness are excluded in the inspection process, but this has been a major factor in reducing the molding efficiency in preform production.
JP-A 63-4932

本発明は前記のような従来の問題点を解決して、従来の成形条件を大きく変更することなく中心部にあるコア層を所定の位置となるように正確に制御することができ、またこれによってプリフォーム製造における成形効率を大幅に向上させることができる多層容器用プリフォームの成形型を提供することを目的とするものである。   The present invention solves the conventional problems as described above, and can accurately control the core layer at the center to be in a predetermined position without greatly changing the conventional molding conditions. Thus, an object of the present invention is to provide a mold for forming a preform for a multilayer container, which can greatly improve the molding efficiency in the production of the preform.

上記課題を解決するためになされた本発明の多層容器用プリフォームの成形型は、コア層および内外スキン層形成用の溶融樹脂を、ゲートを介して順次キャビティ内へ射出してプリフォームを成形する多層容器用プリフォームの成形型において、前記ゲート長さを１５〜３０ｍｍの範囲としたことを特徴とするものである。   The mold for forming a preform for a multi-layer container according to the present invention, which has been made to solve the above problems, molds a preform by sequentially injecting molten resin for forming a core layer and inner and outer skin layers into a cavity through a gate. In the mold for forming a preform for a multilayer container, the gate length is in the range of 15 to 30 mm.

本発明の多層容器用プリフォームの成形型では、コア層および内外スキン層形成用の溶融樹脂を、バルブステムの作動によりゲートを開閉し、該ゲートを介して順次キャビティ内へ射出することで多層のプリフォームを成形するが、前記ゲート長さを１５〜３０ｍｍの範囲とすることにより、溶融樹脂の流れを制御して中心部にあるコア層を所定の位置となるように正確にコントロールできることとなる。   In the mold for forming a preform for a multilayer container according to the present invention, the molten resin for forming the core layer and the inner and outer skin layers is opened and closed by operating the valve stem and sequentially injected into the cavity through the gate. However, by setting the gate length in the range of 15 to 30 mm, the flow of the molten resin can be controlled to accurately control the core layer at the center portion. Become.

以下に、図面を参照しつつ本発明の好ましい形態を示す。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

図面は、コア層とその内外面にあるスキン層の３層からなる多層容器用プリフォームを成形するための成形型を示すものであって、図１は本発明の成形型を示す要部の断面図、図２はプリフォーム成形装置を示す概略図、図３は本発明により製造される多層容器用プリフォームの断面図、図４はゲート部の拡大図、図５〜図１０は本発明の成形型によりプリフォームを成形する工程を示す説明図である。   The drawing shows a mold for molding a preform for a multi-layer container consisting of a core layer and three layers of skin layers on the inner and outer surfaces. FIG. 1 shows the main part of the mold of the present invention. 2 is a schematic view showing a preform molding apparatus, FIG. 3 is a sectional view of a preform for a multilayer container manufactured according to the present invention, FIG. 4 is an enlarged view of a gate portion, and FIGS. It is explanatory drawing which shows the process of shape | molding a preform with this shaping | molding die.

図１において、１はコア層１ａとその内外面にあるスキン層１ｂ、１ｃの３層からなる多層容器用プリフォームを示す。また、２はプリフォームの外表面を形成するキャビティ型、３はプリフォームの内表面を形成するコア型、４はプリフォームの口部を形成するネックリングである。更に、このキャビティ型２には溶融樹脂を成形型内へ導入するためのゲート５が設けられており、該ゲート５を介してコア層１ａおよび内外スキン層１ｂ、１ｃ形成用の溶融樹脂が順次キャビティ内へ射出され、中心部にコア層１ａを有し、内外面にスキン層１ｂ、１ｃを有する３層からなる多層容器用プリフォーム１が成形されるように構成されている。   In FIG. 1, reference numeral 1 denotes a multilayer container preform comprising three layers of a core layer 1a and skin layers 1b and 1c on the inner and outer surfaces thereof. Also, 2 is a cavity mold that forms the outer surface of the preform, 3 is a core mold that forms the inner surface of the preform, and 4 is a neck ring that forms the mouth of the preform. Further, the cavity mold 2 is provided with a gate 5 for introducing the molten resin into the mold, through which the molten resin for forming the core layer 1a and the inner and outer skin layers 1b and 1c is sequentially formed. The multi-layer container preform 1 is injected into the cavity and is formed of a three-layer container 1 having a core layer 1a in the center and skin layers 1b and 1c on the inner and outer surfaces.

図２はプリフォーム成形装置を示すものであり、図中１０はホットランナー、１１，１２はコア層１ａおよび内外スキン層１ｂ、１ｃ形成用の乾燥樹脂原料を貯蔵するレジンホッパー、１３、１４は該乾燥樹脂原料を溶融するコア側およびスキン側バレルである。また、１５はガスバリア材や耐熱材等を加える場合に、それらの材料を保管するためのホッパーである。
このような装置においては、コア側バレル１３およびスキン側バレル１４から所定量の溶融樹脂が所定のタイミングでホットランナー１０を通じて金型２内へ射出され、３層からなる多層容器用プリフォーム１が成形されることとなる。 FIG. 2 shows a preform molding apparatus, in which 10 is a hot runner, 11 and 12 are resin hoppers for storing dry resin raw materials for forming the core layer 1a and the inner and outer skin layers 1b and 1c, It is a core side and skin side barrel which melts the dry resin raw material. Reference numeral 15 denotes a hopper for storing materials such as a gas barrier material and a heat-resistant material.
In such an apparatus, a predetermined amount of molten resin is injected from the core side barrel 13 and the skin side barrel 14 into the mold 2 through the hot runner 10 at a predetermined timing, and the multilayer container preform 1 having three layers is formed. It will be molded.

そして本発明の成形型では、図３に示されるように、前記ゲート５の長さ（Ｌ）を１５〜３０ｍｍの範囲となるようにした点に特徴的構成を有するものである。これは、本発明者が研究した結果、ゲート５の形状を最適のものにすれば溶融樹脂の流れを制御できて、コア層を所定の位置となるようにコントロールできることを見出し本発明に至ったのである。すなわち、従来はゲート５の長さ（Ｌ）が５〜８ｍｍ程度のものが普通であり、この場合には溶融樹脂の流れが不安定となって、特に中間層であるコア層１ａの位置を制御することが困難であったのに対し、ゲート５の長さ（Ｌ）を１５〜３０ｍｍの範囲と従来よりも長くすることでコア層１ａの位置を正確に制御できることが確認できた。この場合、１５ｍｍ未満あるいは３０ｍｍより長いと安定した制御ができないことが実験的に確認されている。   As shown in FIG. 3, the mold of the present invention has a characteristic configuration in that the length (L) of the gate 5 is in the range of 15 to 30 mm. As a result of the research conducted by the present inventor, the present inventors have found that if the shape of the gate 5 is optimized, the flow of the molten resin can be controlled and the core layer can be controlled to be in a predetermined position. It is. That is, conventionally, the gate 5 has a length (L) of about 5 to 8 mm. In this case, the flow of the molten resin becomes unstable, and in particular, the position of the core layer 1a which is an intermediate layer is determined. Although it was difficult to control, it was confirmed that the position of the core layer 1a can be accurately controlled by making the length (L) of the gate 5 in the range of 15 to 30 mm and longer than the conventional one. In this case, it has been experimentally confirmed that stable control cannot be performed when the length is less than 15 mm or longer than 30 mm.

また、前記ゲート５の抜け勾配の角度（θ）は３°以下とすることが好ましい。３°より大きいと、ゲート５の広がり角度が大きくなって、内側スキン層１ｂの位置がずれるおそれがあるからである。
更に、ゲート付け根部の円弧径（Ａ）と、プリフォームの底部中央部とゲート付け根部の３点を通る円弧の径（Ｂ）の大きさも、内層の流動性に大きく影響を与えることを究明し、いずれも５ｍｍ以下とすることが好ましいことが実験的に確認されている。 Further, it is preferable that an angle (θ) of the escape gradient of the gate 5 is 3 ° or less. This is because if the angle is larger than 3 °, the spread angle of the gate 5 becomes large and the position of the inner skin layer 1b may be shifted.
Furthermore, the arc diameter (A) of the base of the gate and the size of the arc (B) passing through the three points of the bottom center of the preform and the base of the gate are also found to greatly affect the fluidity of the inner layer. However, it has been experimentally confirmed that it is preferable that both be 5 mm or less.

次に、本発明の成形型を用いて多層容器用プリフォームを成形する手順について、図面とともに説明する。
先ず、図４に示されるように、バルブステム６は最先端まで前進した位置にあり、各樹脂ゲート７ａ、７ｂ、７ｃは全て閉じた状態にある。従って、各樹脂は成形型２内には射出されない。
次いで、図５に示されるように、バルブステム６は外スキン層形成用の樹脂ゲート７ａのみを開く位置まで後退して、外スキン層形成用の樹脂のみが成形型２内に射出される。
次いで、図６に示されるように、バルブステム６は最後尾まで後退して外スキン層形成用の樹脂ゲート７ａ、コア層形成用の樹脂ゲート７ｂ、内外スキン層形成用の樹脂ゲート７ｃの全てを開く位置まで後退して、コア層形成用の樹脂および内外スキン層形成用の樹脂の全てが成形型２内に射出され、多層状態で射出が進行する。
次いで、図７に示されるように、バルブステム６は外スキン層形成用の樹脂ゲート７ａのみを開く位置まで再び前進して、コア層形成用の樹脂ゲート７ｂおよび内スキン層形成用の樹脂ゲート７ｃを閉じ、コア層形成用の樹脂および内スキン層形成用の樹脂の射出を止める。
次いでこのままの状態を維持して、図８に示されるように、バルブステム６は外スキン層形成用の樹脂ゲート７ａのみを開き、外スキン層形成用の樹脂のみを射出しゲートスプルー８まで成形する。
最後に、図９に示されるように、バルブステム６は最先端まで前進した位置にあり、再び各樹脂ゲート７ａ、７ｂ、７ｃを全て閉じた状態として射出成形を終了する。 Next, the procedure for forming a multilayer container preform using the mold of the present invention will be described with reference to the drawings.
First, as shown in FIG. 4, the valve stem 6 is in a position advanced to the forefront, and the resin gates 7a, 7b, 7c are all closed. Accordingly, each resin is not injected into the mold 2.
Next, as shown in FIG. 5, the valve stem 6 is retracted to a position where only the outer skin layer forming resin gate 7 a is opened, and only the outer skin layer forming resin is injected into the mold 2.
Next, as shown in FIG. 6, the valve stem 6 is retracted to the end, and all of the resin gate 7a for forming the outer skin layer, the resin gate 7b for forming the core layer, and the resin gate 7c for forming the inner and outer skin layers. The resin for forming the core layer and the resin for forming the inner and outer skin layers are all injected into the mold 2 and the injection proceeds in a multilayer state.
Next, as shown in FIG. 7, the valve stem 6 advances again to a position where only the outer skin layer forming resin gate 7a is opened, and the core layer forming resin gate 7b and the inner skin layer forming resin gate. 7c is closed, and injection of the resin for forming the core layer and the resin for forming the inner skin layer is stopped.
Next, while maintaining this state, as shown in FIG. 8, the valve stem 6 opens only the resin gate 7 a for forming the outer skin layer, and injects only the resin for forming the outer skin layer to form the gate sprue 8. To do.
Finally, as shown in FIG. 9, the valve stem 6 is in a position advanced to the forefront, and the resin molding 7 a, 7 b, 7 c are all closed again, and the injection molding is finished.

このように本発明は、コア層１ａおよび内外スキン層１ｂ、１ｃ形成用の溶融樹脂を、バルブステム６の作動によりゲート５を開閉し、該ゲート５を介して順次キャビティ内へ射出してプリフォーム１を成形するための多層容器用プリフォームの成形型において、前記ゲート長さ（Ｌ）を１５〜３０ｍｍの範囲としたので、溶融樹脂の流れを制御できて、コア層１ａを所定の位置となるようにコントロールすることができる。この結果、成形効率を大幅に向上させることができることとなる。   Thus, in the present invention, the molten resin for forming the core layer 1a and the inner and outer skin layers 1b and 1c is opened and closed by the operation of the valve stem 6, and sequentially injected into the cavity through the gate 5. Since the gate length (L) is in the range of 15 to 30 mm in the mold for the preform for the multilayer container for molding the reform 1, the flow of the molten resin can be controlled, and the core layer 1a is positioned at a predetermined position. Can be controlled. As a result, the molding efficiency can be greatly improved.

内容量５００ｍｌの容器用の３層プリフォームを成形するに際し、ゲート長さ（Ｌ）、ゲートの抜け勾配の角度、ゲート付け根部の円弧径（Ａ）、プリフォームの底部中央部とゲート付け根部の３点を通る円弧の径（Ｂ）を種々の値に変化させて生産した。得られたプリフォームのコア層の位置を検査した結果は［表１］に示されるとおりであり、本発明の優れた効果が確認できた。   When molding a three-layer preform for a container with an internal volume of 500 ml, the gate length (L), the angle of the gate slope, the arc diameter of the base of the gate (A), the center of the bottom of the preform and the base of the gate The diameter (B) of the arc passing through the three points was changed to various values for production. The results of examining the position of the core layer of the obtained preform are as shown in [Table 1], and the excellent effect of the present invention was confirmed.

Figure 2005343099
Figure 2005343099

本発明の成形型を示す要部の断面図である。It is sectional drawing of the principal part which shows the shaping | molding die of this invention. プリフォーム成形装置を示す概略図である。It is the schematic which shows a preform shaping | molding apparatus. ゲート部の拡大図である。It is an enlarged view of a gate part. プリフォームを成形する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a preform. プリフォームを成形する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a preform. プリフォームを成形する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a preform. プリフォームを成形する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a preform. プリフォームを成形する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a preform. プリフォームを成形する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a preform.

符号の説明Explanation of symbols

１ プリフォーム
１ａ コア層
１ｂ 内スキン層
１ｃ 外スキン層
２ キャビティ型
３ コア型
４ ネックリング
５ ゲート
６ バルブステム
１０ ホットランナー
１３ コア側バレル
１４ スキン側バレル
DESCRIPTION OF SYMBOLS 1 Preform 1a Core layer 1b Inner skin layer 1c Outer skin layer 2 Cavity type 3 Core type 4 Neck ring 5 Gate 6 Valve stem 10 Hot runner 13 Core side barrel 14 Skin side barrel

Claims (4)

コア層および内外スキン層形成用の溶融樹脂を、ゲートを介して順次キャビティ内へ射出してプリフォームを成形する多層容器用プリフォームの成形型において、前記ゲート長さを１５〜３０ｍｍの範囲としたことを特徴とする多層容器用プリフォームの成形型。   In a mold for a preform for a multi-layer container in which molten resin for forming a core layer and inner and outer skin layers is sequentially injected into a cavity through a gate to form a preform, the gate length is in the range of 15 to 30 mm. A mold for forming a preform for a multi-layer container. ゲートの抜け勾配の角度を３°以下とした請求項１に記載の多層容器用プリフォームの成形型。   2. The mold for forming a preform for a multi-layer container according to claim 1, wherein the angle of the draft of the gate is 3 ° or less. ゲート付け根部の円弧径を５ｍｍ以下とした請求項１または２に記載の多層容器用プリフォームの成形型。   The mold for forming a preform for a multi-layer container according to claim 1 or 2, wherein an arc diameter of the gate base is 5 mm or less. プリフォームの底部中央部とゲート付け根部の３点を通る円弧の径を５ｍｍ以下とした請求項１または２または３に記載の多層容器用プリフォームの成形型。
4. The mold for forming a preform for a multi-layer container according to claim 1, wherein the diameter of an arc passing through three points of the bottom center portion of the preform and the gate base portion is 5 mm or less.
JP2004167907A 2004-06-07 2004-06-07 Mold for preform of multilayer container Pending JP2005343099A (en)

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US11370154B2 (en) 2016-10-05 2022-06-28 Husky Injection Molding Systems Ltd. Multi-material hot runner nozzle

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