JP2000218682A - Blow molding of resin hollow molded article - Google Patents
Blow molding of resin hollow molded articleInfo
- Publication number
- JP2000218682A JP2000218682A JP2291899A JP2291899A JP2000218682A JP 2000218682 A JP2000218682 A JP 2000218682A JP 2291899 A JP2291899 A JP 2291899A JP 2291899 A JP2291899 A JP 2291899A JP 2000218682 A JP2000218682 A JP 2000218682A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- hollow molded
- resin
- blow molding
- molded article
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シート状パリソン
をブロー成形して樹脂中空成形品を成形するとともに、
ブロー成形時に発泡体を内装する樹脂中空成形品のブロ
ー成形方法に関する。[0001] The present invention relates to a blow molding of a sheet parison to form a resin hollow molded article,
The present invention relates to a blow molding method for a resin hollow molded article in which a foam is provided during blow molding.
【０００２】本発明に係る樹脂中空成形品は、主とし
て、冷凍冷蔵コンテナや冷蔵庫のドア、建築用パネルや
ドア、あるいは自動車のスポイラー、ドアパネルまたは
コンソールパネルなどの断熱、遮音性を要求される用途
に供されるものである。[0002] The resin hollow molded article according to the present invention is mainly used for applications requiring heat insulation and sound insulation, such as doors of refrigerated containers and refrigerators, panels and doors for construction, automobile spoilers, door panels and console panels. It is provided.
【０００３】[0003]
【従来の技術】従来から、シート状パリソンをブロー成
形して樹脂中空成型品を成形する方法としては、特公平
４−１４０５１号公報に示すように、ダイから押し出し
たシートと織布とを一対のローラ間を通して互いに貼り
合わせて形成したパリソンを、分割金型間に配置してブ
ロー成形することが行われている。2. Description of the Related Art Conventionally, as a method of forming a resin hollow molded product by blow molding a sheet-like parison, as disclosed in Japanese Patent Publication No. 4-14051, a sheet extruded from a die and a woven fabric are paired. The parisons formed by laminating each other through the rollers are arranged between divided molds and blow-molded.
【０００４】また、発泡体を内装した樹脂中空成形品の
製造方法として、成形後に反応性の発泡ポリウレタン液
を充填する方法は、特開平２−２５８３１６号公報に、
ブロー成形後、成形型内で成形品内にポリスチレンの発
泡樹脂液を充填する方法は、特開平５−１３８７２２号
公報に、さらにブロー成形後、成形型外で成形品内にポ
リスチレン等の発泡粒状体を充填する方法は、特開昭５
８−２１７３４３号公報にそれぞれ記載されている。[0004] As a method of manufacturing a resin hollow molded article containing a foam, a method of filling a reactive foamed polyurethane liquid after molding is disclosed in Japanese Patent Application Laid-Open No. 2-258316.
Japanese Patent Application Laid-Open No. 5-138722 discloses a method of filling a molded article with a foamed resin liquid of polystyrene in a mold after blow molding. The method of filling the body is disclosed in
No. 8-217343.
【０００５】[0005]
【発明が解決しようとする課題】ところで、従来の特開
平２−２５８３１６号公報に記載されている方法では、
発泡ポリウレタン液の発泡にともなう発熱により成形品
自体が変形しやすく、成形品の表面に発泡ポリウレタン
液の充填孔が生じるうえ、発泡ポリウレタン液の発泡に
ともなって発生するガスのガス抜きを必要とし、それが
容易でないなどの問題がある。また、特開平５−１３８
７２２号公報に記載されている技術では、ポリスチレン
等の発泡粒状体を発泡させるのに蒸気の導入を要するう
え、発泡に発熱をともなうので、型内の成形品の冷却に
時間がかかり、成形コストが増大する欠点がある。さら
に、特開昭５８−２１７３４３号公報に記載された技術
では、成形品内に発泡体を充填することが容易でないう
え、内部に発泡体を密に充填することが困難である。By the way, in the conventional method described in Japanese Patent Application Laid-Open No. 2-258316,
The molded product itself is easily deformed due to the heat generated by the foaming of the foamed polyurethane liquid, and a filling hole of the foamed polyurethane liquid is formed on the surface of the molded article, and the gas generated due to the foaming of the foamed polyurethane liquid needs to be degassed, There is a problem that it is not easy. Also, Japanese Patent Application Laid-Open No. 5-138
According to the technology described in Japanese Patent No. 722, it is necessary to introduce steam to foam a foamed granular material such as polystyrene, and since foaming involves heat generation, it takes a long time to cool a molded article in a mold, and molding cost is reduced. Has the disadvantage of increasing Furthermore, according to the technique described in JP-A-58-217343, it is not easy to fill a molded article with a foam, and it is difficult to densely fill the inside with a foam.
【０００６】そこで、本発明は、従来のこの種の樹脂中
空成形品の成形方法における欠点を解消すべく、予め成
形した発泡体を一対のシート状パリソン間に配置して、
分割金型を締めてキャビティの周囲を互いに密着させて
ピンチオフ部を形成し、次いで閉じたシート状パリソン
の内部に圧力流体を導入して発泡体を内装した樹脂中空
成形品をブロー成形することにより、内部に発泡体が密
に内装された樹脂中空成形品をブロー成形により容易に
成形することができる樹脂中空成形品のブロー成形方法
を提供することを目的とするものである。[0006] In order to solve the drawbacks of the conventional method of molding such a resin hollow molded article, the present invention disposes a preformed foam between a pair of sheet parisons.
By forming a pinch-off part by tightening the split molds and bringing the peripheries of the cavities into close contact with each other, and then introducing a pressure fluid into the inside of the closed sheet-like parison and blow-molding a resin hollow molded article with a foam inside. It is another object of the present invention to provide a method for blow molding a resin hollow molded article in which a resin hollow molded article in which a foam is densely packed therein can be easily molded by blow molding.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明の請求項１に係る樹脂中空成形品のブロー成
形方法は、樹脂押出ヘッドから押し出した一対のシート
状パリソンを分割金型間に配置し、シート状パリソンを
キャビティの周囲に接触させて、シート状パリソンと分
割金型のキャビテイとの間を閉じた空間を形成する状態
としたうえ、分割金型のキャビティ面から上記空間内の
空気を真空吸引してシート状パリソンを分割金型のキャ
ビティ面に密着させ、予め成形した発泡体を一対のシー
ト状パリソン間に配置して、分割金型を締めてキャビテ
ィの周囲を互いに密着させてピンチオフ部を形成し、次
いで閉じたシート状パリソンの内部に圧力流体を導入し
て発泡体を内装した樹脂中空成形品をブロー成形するこ
とを特徴とするものである。According to a first aspect of the present invention, there is provided a method for blow molding a resin hollow molded article, comprising the steps of: forming a pair of sheet parisons extruded from a resin extrusion head between divided molds; And the sheet parison is brought into contact with the periphery of the cavity to form a closed space between the sheet parison and the cavity of the split mold. Air is sucked in vacuum to bring the sheet parison into close contact with the cavity surface of the split mold, the preformed foam is placed between the pair of sheet parisons, and the split mold is tightened to bring the peripheries of the cavity into close contact with each other. Forming a pinch-off portion, and then blow molding a resin hollow molded product with a foam inside by introducing a pressure fluid into the inside of a closed sheet-like parison. A.
【０００８】また、本発明の請求項２に係る樹脂中空成
形品のブロー成形方法は、請求項１記載の方法におい
て、キャビティの形状をシート状パリソンの冷却収縮率
を予め見込んだ樹脂中空成形品より大きめの寸法とし
て、発泡体との間に隙間を形成して分割金型をしめるこ
とを特徴とするものである。According to a second aspect of the present invention, there is provided a method for blow molding a resin hollow molded article according to the first aspect, wherein the shape of the cavity is determined in advance by considering the cooling shrinkage of the sheet parison. As a larger dimension, it is characterized in that a gap is formed between the foamed body and the split mold is closed.
【０００９】本発明の請求項３に係る樹脂中空成形品の
ブロー成形方法は、請求項１または２記載の方法におい
て、発泡体は、シート状パリソンと同材質であることを
特徴とするものである。According to a third aspect of the present invention, there is provided a method of blow molding a resin hollow molded article, wherein the foam is made of the same material as the sheet parison. is there.
【００１０】本発明の請求項４に係る樹脂中空成形品の
ブロー成形方法は、請求項１、２または３記載の方法に
おいて、一対のシート状パリソンは、異色の同材質樹脂
であることを特徴とするものである。According to a fourth aspect of the present invention, there is provided a method for blow molding a resin hollow molded article according to the first, second or third aspect, wherein the pair of sheet parisons are made of the same resin of different colors. It is assumed that.
【００１１】本発明の請求項５に係る樹脂中空成形品の
ブロー成形方法は、請求項１、２、３または４記載の方
法において、一対のシート状パリソンは、多層構造であ
って、少なくとも内層を同材質であることを特徴とする
ものである。According to a fifth aspect of the present invention, there is provided a blow molding method of a resin hollow molded article according to the first, second, third or fourth aspect, wherein the pair of sheet parisons has a multilayer structure, and at least an inner layer. Are made of the same material.
【００１２】本発明の請求項６に係る樹脂中空成形品の
ブロー成形方法は、請求項１、２、３、４または５記載
の方法において、シート状パリソンの樹脂中空成形品の
表面に当たる面に布などの表皮材が貼着されていること
を特徴とするものである。According to a sixth aspect of the present invention, there is provided a method for blow molding a resin hollow molded article according to the first, second, third, fourth, or fifth aspect, wherein the surface of the sheet-shaped parison which hits the surface of the resin hollow molded article is used. It is characterized in that a skin material such as cloth is adhered.
【００１３】[0013]
【発明の実施の形態】図１は本発明に係る樹脂中空成形
品のブロー成形方法により成形された樹脂中空成形品を
一部破断して示す全体斜視図である。図２ないし図８は
本発明に係る樹脂中空成形品のブロー成形方法の実施の
形態あって、樹脂押出ヘッドから押し出されたシート状
パリソンと装飾シートとにより加飾パリソンを形成する
態様を示す正面図、図３は樹脂押出ヘッドを下方からみ
た下面図、図４は図２の破線円Ａ内の詳細構成を示す断
面図、図５は分割金型間に加飾パリソンを配置した工程
を示す断面図、図６は分割金型間に配置した加飾パリソ
ンをキャビティ面に真空吸着した工程を示す断面図、図
７は樹脂中空成形品内に発泡体を内装する工程を示す断
面図、図８はブロー成形の工程を示す断面図である。FIG. 1 is an overall perspective view showing a partially cutaway hollow resin molded article formed by a blow molding method for a hollow resin article according to the present invention. FIGS. 2 to 8 show an embodiment of the blow molding method for a resin hollow molded article according to the present invention, and show a mode in which a decorative parison is formed by a sheet parison and a decorative sheet extruded from a resin extrusion head. FIG. 3 is a bottom view of the resin extrusion head as viewed from below, FIG. 4 is a cross-sectional view showing a detailed configuration within a dashed circle A in FIG. 2, and FIG. 5 shows a process in which a decorative parison is arranged between split molds. FIG. 6 is a cross-sectional view showing a process of vacuum-adsorbing a decorative parison disposed between divided molds on a cavity surface, and FIG. 7 is a cross-sectional view showing a process of providing a foam inside a resin hollow molded article. FIG. 8 is a sectional view showing a blow molding process.
【００１４】図１において、１は樹脂中空成形品であ
り、この樹脂中空成形品１は、主体層２と主体層２の外
面層を覆う加飾膜層３とでなり、樹脂中空成形品１内に
は、発泡体４が密に内装されている。In FIG. 1, reference numeral 1 denotes a hollow resin molded product. The hollow resin molded product 1 includes a main layer 2 and a decorative film layer 3 covering an outer surface layer of the main layer 2. Inside, a foam 4 is densely provided.
【００１５】樹脂中空成形品１を構成する主体層２は、
ポリエチレン、ポリプロピレン、ポリアミド、ポリスチ
レン、ＡＢＳ樹脂、ポリエチレンテレフタートなどの熱
可塑性樹脂でなり、加飾膜層３は主体層２と同材質の熱
可塑性樹脂で構成したりあるいはホットメルトタイプの
接着剤を介したり接着した布を介した異質な熱可塑性樹
脂または布などの装飾材で構成される。加飾膜層は、熱
可塑性樹脂の場合はその表面に木目模様、大理石模様、
石目模様または光沢面を有する。加飾膜層３と主体層２
ろの接合は、加飾膜層３が同材質の熱可塑性樹脂の場合
はそれらの接着により発現し、ホットメルトタイプの接
着剤を介した異質な熱可塑性樹脂の場合は接着剤の接着
により発現するものであり、さらに接着した布を介した
異質な熱可塑性樹脂の場合あるいは布等の装飾材の場合
は布の目の中に熱可塑性樹脂が入り込むことにより物理
的に接合されるものである。加飾膜層３の表面に木目模
様、大理石模様、石目模様、あるいは光沢面を形成する
には、その表面に印刷を施したり表面処理をするなど適
宜の手段によることができる。発泡体４は発泡ポリエチ
レン、発泡ポリプロピレンあるいは発泡ポリスチロール
などであるが、リサイクルのうえで発泡体４の材質は、
主体層２と同材質であることが好ましい。The main layer 2 constituting the hollow resin molded article 1 is
The decorative film layer 3 is made of a thermoplastic resin such as polyethylene, polypropylene, polyamide, polystyrene, ABS resin, or polyethylene terephthalate, and the decorative layer 3 is made of the same material as the main layer 2 or a hot-melt adhesive is used. It is composed of a decoration material such as a heterogeneous thermoplastic resin or cloth through an interposed or bonded cloth. In the case of a thermoplastic resin, the decorative film layer has a grain pattern, a marble pattern,
It has a stone pattern or glossy surface. Decorative film layer 3 and main layer 2
When the decorative film layer 3 is made of a thermoplastic resin of the same material, the bonding is achieved by bonding them, and when the decorative film layer 3 is a heterogeneous thermoplastic resin via a hot melt type adhesive, it is developed by bonding of the adhesive. In the case of a heterogeneous thermoplastic resin via a bonded cloth or a decorative material such as a cloth, the thermoplastic resin enters the eyes of the cloth and is physically bonded. . In order to form a wood pattern, a marble pattern, a stone pattern, or a glossy surface on the surface of the decorative film layer 3, any appropriate means such as printing or surface treatment can be applied to the surface. The foam 4 is foamed polyethylene, foamed polypropylene, foamed polystyrene, or the like.
The material is preferably the same as that of the main layer 2.
【００１６】次に、図１に示すような樹脂中空成形品１
のブロー成形態様について説明する。図２に示すよう
に、樹脂押出ヘッド５から押し出されるシート状パリソ
ン６と装飾シート７は、圧着ロール８，８により互いに
圧着され、内側がシート状パリソン６、外側が装飾シー
ト７からなる加飾パリソン９が形成される（図４参
照）。加飾パリソン９のシート状パリソン６は図１の主
体層２、装飾シート７は加飾膜層３となる層である。装
飾シート７は、その一部、特に内面の一部が布状である
ことが、シート状パリソン６との溶着を強くするうえで
好適である。樹脂押出ヘッド５は、環状の樹脂路１０を
有するものであって、その環状の樹脂路１０は、詰め部
材１１，１１により２分されて、樹脂押出ヘッド５から
押し出される環状のパリソンは切り開かれて、上記のよ
うな一対のシート状パリソン６，６となるものである。
上記ロール８，８は、表面にフッ素の薄膜でコーティン
グを施し、また７０〜１００℃程度に加熱するのが樹脂
の付着防止および溶着強度の向上のうえで好ましい。Next, a resin hollow molded article 1 as shown in FIG.
Will be described. As shown in FIG. 2, the sheet parison 6 and the decorative sheet 7 extruded from the resin extrusion head 5 are pressed against each other by pressing rolls 8, 8, and are decorated with the sheet parison 6 on the inside and the decorative sheet 7 on the outside. A parison 9 is formed (see FIG. 4). The sheet-like parison 6 of the decorative parison 9 is the main layer 2 and the decorative sheet 7 is the layer of the decorative film layer 3 in FIG. It is preferable that a part of the decorative sheet 7, in particular, a part of the inner surface thereof be cloth-like, in order to strengthen the welding with the sheet-like parison 6. The resin extrusion head 5 has an annular resin path 10. The annular resin path 10 is divided into two parts by filling members 11, 11, and an annular parison extruded from the resin extrusion head 5 is cut open. Thus, a pair of sheet parisons 6 and 6 as described above are formed.
It is preferable to coat the surfaces of the rolls 8 and 8 with a thin film of fluorine and to heat the rolls to about 70 to 100 ° C. from the viewpoint of preventing the adhesion of the resin and improving the welding strength.
【００１７】図５に示すように、一対の加飾パリソン
９，９を分割金型１２，１２間に配置するが、この工程
においては、分割金型１２，１２のキャビティ１３，１
３の周囲にキャビティ１３，１３から突出可能に備えら
れている摺動部１４，１４を突出させてその端面を加飾
パリソン９，９に接触させ、加飾パリソン９，９と分割
金型１２，１２のキャビテイ１３，１３との間を閉じた
空間を形成する状態とする。そして、図６に示すよう
に、真空ポンプおよび真空タンク（いずれも図示せず）
と接続した真空チャンバー１５により分割金型１２，１
２のキャビティ１３，１３の面から上記空間内の空気を
真空吸引して、加飾パリソン９，９を分割金型１２，１
２のキャビティ１３，１３の面に密着させる。次いで、
図７に示すように、分割金型１２，１２の間で一対の加
飾パリソン９，９間に発泡体４を配置したうえ、図８に
示すように、分割金型１２，１２を型締めし、キャビテ
ィ１３，１３の周囲を互いに密着させてピンチオフを形
成し、ブローピン１６を一方の加飾パリソン９に差し込
んで内部に加圧流体を導入して、ブロー成形して図１に
示すような樹脂中空成形品を成形する。なお、分割金型
１２，１２において、真空チャンバー１５とキャビティ
１３，１３の面側とは、金型を構成する部材の接触面１
７に生じる隙間により連通されるものである。As shown in FIG. 5, a pair of decorative parisons 9, 9 are arranged between the split dies 12, 12. In this step, the cavities 13, 1 of the split dies 12, 12 are arranged.
3, the sliding portions 14, 14 provided so as to be able to protrude from the cavities 13, 13 are made to protrude so that their end faces contact the decorative parisons 9, 9, and the decorative parisons 9, 9 and the split mold 12 , 12 with the cavities 13, 13 to form a closed space. Then, as shown in FIG. 6, a vacuum pump and a vacuum tank (both not shown)
Molds 12, 1 by a vacuum chamber 15 connected to the
The air in the space is vacuum-evacuated from the surfaces of the cavities 13, 13 to separate the decorated parisons 9, 9 into the split molds 12, 1.
The second cavity 13 is brought into close contact with the surface. Then
As shown in FIG. 7, the foam 4 is arranged between the pair of decorative parisons 9, 9 between the split molds 12, 12, and the split molds 12, 12 are clamped as shown in FIG. Then, the peripheries of the cavities 13 and 13 are brought into close contact with each other to form a pinch-off, and a blow pin 16 is inserted into one of the decorative parisons 9 to introduce a pressurized fluid into the interior and blow-molded as shown in FIG. A resin hollow molded article is formed. In the split molds 12, 12, the vacuum chamber 15 and the surface side of the cavities 13, 13 correspond to the contact surfaces 1 of the members constituting the mold.
7 are communicated with each other.
【００１８】本発明に係る樹脂中空成形品のブロー成形
方法によれば、一対の加飾パリソン９，９を、キャビテ
ィ１３，１３の周囲に突出可能な摺動部１４，１４を備
えた分割金型１２，１２間に配置し、上記摺動部１４，
１４を突出させてその端面を加飾パリソン９，９に接触
させて、加飾パリソン９，９と分割金型１２，１２のキ
ャビテイ１３，１３との間に閉じた空間を形成する状態
としたうえ、分割金型１２，１２のキャビティ１３，１
３の面から上記空間内の空気を真空吸引して加飾パリソ
ン９，９を分割金型１２，１２のキャビティ１３，１３
の面に密着させる手段を採用しているので、一対の加飾
パリソン９，９がシート状であっても分割金型１２，１
２のキャビティ１３，１３に不規則に接触することがな
く、キャビティ１３，１３に均等に密着させて予め樹脂
中空成形品の略外形を形成したたうえで、ブロー成形す
ることができる。このため、加飾パリソン９，９がシー
ト状であっても成形不良が生ぜず、しかも表面に加飾が
施されたものにおいて特に表面の装飾性すぐれた樹脂中
空成形を得ることができる。According to the blow molding method of the hollow resin molded article according to the present invention, the pair of decorative parisons 9, 9 are divided into metal parts having sliding parts 14, 14, which can protrude around the cavities 13, 13. Placed between the dies 12,
14 is projected and its end face is brought into contact with the decorating parisons 9, 9 to form a closed space between the decorating parisons 9, 9 and the cavities 13, 13 of the split molds 12, 12. In addition, the cavities 13, 1 of the split molds 12, 12
3, the decorated parisons 9, 9 are vacuum-evacuated from the surface of the space to form the decorated parisons 9, 9, and the cavities 13, 13 of the split molds 12, 12.
Since the means for adhering to the surfaces of the pair of decorative parisons 9, 9 are sheet-like, the split molds 12, 1
Without irregular contact with the second cavities 13, 13, the resin hollow molded article can be blow-molded after forming the approximate external shape of the resin hollow molded article in uniform contact with the cavities 13, 13 in advance. For this reason, even if the decorative parisons 9 and 9 are sheet-shaped, molding failure does not occur, and in the case where the surface is decorated, it is possible to obtain resin hollow molding with particularly excellent decorativeness on the surface.
【００１９】なお、本発明に係る実施の形態によれば、
樹脂中空品１を加飾パリソン９，９で構成しているが、
単層のシート状パリソン、多層のシート状パリソンで成
形することができ、また、一対のシート状パリソンを異
色でかつ少なくとも内層が同材質のもので成形すること
もできる。According to the embodiment of the present invention,
The hollow resin article 1 is composed of decorative parisons 9, 9,
A single-layer sheet parison or a multilayer sheet parison can be formed, and a pair of sheet parisons can be formed of different colors and at least an inner layer of the same material.
【００２０】加飾パリソン９，９は、ブロー成形後の冷
却により収縮する。例えば、加飾パリソン９がポリエチ
レンでは１．８％、ポリプロピレンでは１．６％、ポリ
スチレンでは０．８％、ＡＢＳ樹脂では０．５〜０．７
％である。したがって、図１に示す樹脂中空成形品１
は、収縮率を見込んで大きめに成形するが、内装する発
泡体４は収縮を見込むことなく樹脂中空成形品１の肉厚
分だけ除いた寸法からなる成形品であるから、図７に示
す工程において、発泡体４を配置し、次いで図８に示す
型締めの際には、余裕をもって加飾パリソン９，９内に
入れ込むことができる。この場合、上記冷却による収縮
分だけの隙間が加飾パリソン９，９と発泡体４との間に
あっても、冷却後はその内部に密に内装されて状態とな
る。The decorative parisons 9, 9 shrink by cooling after blow molding. For example, the decorative parison 9 is 1.8% in polyethylene, 1.6% in polypropylene, 0.8% in polystyrene, and 0.5 to 0.7 in ABS resin.
%. Therefore, the resin hollow molded article 1 shown in FIG.
Is formed with a large size in anticipation of the shrinkage rate, but since the interior foam 4 is a molded product having a size that excludes the thickness of the resin hollow molded product 1 without anticipating shrinkage, the process shown in FIG. In FIG. 8, the foam 4 can be arranged, and then can be inserted into the decorating parisons 9, 9 with a margin during the mold clamping shown in FIG. In this case, even if there is a gap between the decorative parisons 9 and 9 and the foam 4 due to the shrinkage due to the cooling, after the cooling, the interior is densely packed inside.
【００２１】ところで、ブローピン１６を一方の加飾パ
リソン９に差し込んで内部に加圧流体を導入してブロー
成形する際には、上記冷却による収縮による隙間を通じ
て加圧流体を導入すると、従来のブロー成形と同様の冷
却効率で冷却することができるが、発泡体４の温度は基
本的に常温であるから、概して速く冷却することができ
る。By the way, when the blow pin 16 is inserted into one of the decorative parisons 9 to introduce the pressurized fluid into the inside and perform blow molding, the pressurized fluid is introduced through the gap caused by the above-described shrinkage due to cooling. Although the cooling can be performed with the same cooling efficiency as that of the molding, the temperature of the foam 4 is basically room temperature, so that the cooling can be generally performed quickly.
【００２２】なお、発泡体４の存在によりパリソンがブ
ローピン１６の挿入によっても逃げないので、ブローピ
ン１６はどの位置に設けてもかまわない。Since the parison does not escape due to the insertion of the blow pin 16 due to the presence of the foam 4, the blow pin 16 may be provided at any position.
【００２３】発泡体４は、加飾パリソン９と必ずしも同
材質でなくてもよいが、これを同材質とすれば、リサイ
クルのうえで好ましい。本実施の形態では、一対の加飾
パリソン９，９により樹脂中空成形品１をブロー成形し
ているが、これはシート状パリソンの一方のシートだけ
が加飾パリソン９であってもよい。The foam 4 does not necessarily have to be made of the same material as the decorative parison 9, but if it is made of the same material, it is preferable in terms of recycling. In the present embodiment, the resin hollow molded article 1 is blow-molded by the pair of decorative parisons 9, 9, but only one of the sheet parisons may be the decorative parison 9.
【００２４】[0024]
【発明の効果】本発明によれば、樹脂押出ヘッドから押
し出した一対のシート状パリソンを分割金型間に配置
し、シート状パリソンをキャビティの周囲に接触させ
て、シート状パリソンと分割金型のキャビテイとの間を
閉じた空間を形成する状態としたうえ、分割金型のキャ
ビティ面から上記空間内の空気を真空吸引してシート状
パリソンを分割金型のキャビティ面に密着させ、予め成
形した発泡体を一対のシート状パリソン間に配置して、
分割金型を締めてキャビティの周囲を互いに密着させて
ピンチオフ部を形成し、次いで閉じたシート状パリソン
の内部に圧力流体を導入して発泡体を内装した樹脂中空
成形品をブロー成形することにより、内部に発泡体が密
に内装された樹脂中空成形品をブロー成形により容易に
成形することができる効果を奏するものである。According to the present invention, a pair of sheet parisons extruded from the resin extrusion head are arranged between the split molds, and the sheet parisons are brought into contact with the periphery of the cavity, so that the sheet parisons and the split molds are arranged. And a cavity between the cavities is formed, and the air in the space is vacuum-evacuated from the cavity surface of the split mold to bring the sheet-shaped parison into close contact with the cavity surface of the split mold and pre-mold. Placed foam between a pair of sheet parison,
By forming a pinch-off part by tightening the split molds and bringing the peripheries of the cavities into close contact with each other, and then introducing a pressure fluid into the inside of the closed sheet-like parison and blow-molding a resin hollow molded article with a foam inside. Further, there is an effect that a resin hollow molded article in which a foam is densely provided inside can be easily molded by blow molding.
【図１】本発明に係る樹脂中空成形品のブロー成形方法
により成形された樹脂中空成形品を一部破断して示す全
体斜視図である。FIG. 1 is an overall perspective view showing a partially cut resin hollow molded product formed by a blow molding method for a resin hollow molded product according to the present invention.
【図２】本発明に係る樹脂中空成形品のブロー成形方法
の実施の形態あって、樹脂押出ヘッドから押し出された
シート状パリソンと装飾シートとにより加飾パリソンを
形成する態様を示す正面図である。FIG. 2 is a front view showing an embodiment of a blow molding method of a resin hollow molded article according to the present invention, in which a decorative parison is formed by a sheet parison and a decorative sheet extruded from a resin extrusion head. is there.
【図３】樹脂押出ヘッドを下方からみた下面図である。FIG. 3 is a bottom view of the resin extrusion head as viewed from below.
【図４】図２の破線円Ａ内の詳細構成を示す断面図であ
る。FIG. 4 is a sectional view showing a detailed configuration within a dashed circle A in FIG. 2;
【図５】分割金型間に加飾パリソンを配置した工程を示
す断面図である。FIG. 5 is a cross-sectional view showing a process in which a decorative parison is arranged between split molds.
【図６】分割金型間に配置した加飾パリソンをキャビテ
ィ面に真空吸着した工程を示す断面図である。FIG. 6 is a cross-sectional view showing a step of vacuum-adsorbing a decorative parison disposed between divided molds onto a cavity surface.
【図７】樹脂中空成形品内に発泡体を内装する工程を示
す断面図である。FIG. 7 is a cross-sectional view showing a step of providing a foam inside a resin hollow molded article.
【図８】ブロー成形の工程を示す断面図である。FIG. 8 is a sectional view showing a blow molding process.
１ 樹脂中空成形品 ２ 主体層 ３ 加飾膜層 ４ 発泡体 ５ 樹脂押出ヘッド ６ シート状パリソン ７ 装飾シート ８ 圧着ロール ９ 加飾パリソン １０ 環状の樹脂路 １１ 詰め部材 １２ 分割金型 １３ キャビティ １４ 摺動部 １５ 真空チャンバー １６ ブローピン １７ 接触面 REFERENCE SIGNS LIST 1 resin hollow molded product 2 main layer 3 decorative film layer 4 foam 5 resin extrusion head 6 sheet parison 7 decorative sheet 8 pressure roll 9 decorative parison 10 annular resin path 11 filling member 12 split mold 13 cavity 14 slide Moving part 15 Vacuum chamber 16 Blow pin 17 Contact surface
Claims (6)
ート状パリソンを分割金型間に配置し、シート状パリソ
ンをキャビティの周囲に接触させて、シート状パリソン
と分割金型のキャビテイとの間を閉じた空間を形成する
状態としたうえ、分割金型のキャビティ面から上記空間
内の空気を真空吸引してシート状パリソンを分割金型の
キャビティ面に密着させ、予め成形した発泡体を一対の
シート状パリソン間に配置して、分割金型を締めてキャ
ビティの周囲を互いに密着させてピンチオフ部を形成
し、次いで閉じたシート状パリソンの内部に圧力流体を
導入して発泡体を内装した樹脂中空成形品をブロー成形
することを特徴とする樹脂中空成形品のブロー成形方
法。1. A pair of sheet parisons extruded from a resin extrusion head are arranged between split molds, and the sheet parisons are brought into contact with the periphery of a cavity to allow a space between the sheet parison and the cavities of the split molds. After the closed space is formed, the air in the space is vacuum-evacuated from the cavity surface of the split mold to bring the sheet-shaped parison into close contact with the cavity surface of the split mold. It is placed between the sheet parisons, the divided molds are tightened, the peripheries of the cavities are brought into close contact with each other to form a pinch-off portion, and then a pressure fluid is introduced into the inside of the closed sheet-shaped parison to form a resin with a foam inside. A blow molding method for a resin hollow molded product, comprising blow molding a hollow molded product.
冷却収縮率を予め見込んだ樹脂中空成形品より大きめの
寸法として、発泡体との間に隙間を形成して分割金型を
しめることを特徴とする請求項１記載の樹脂中空成形品
のブロー成形方法。2. The method according to claim 1, wherein the shape of the cavity is made larger than that of the resin hollow molded article in which the cooling shrinkage rate of the sheet-like parison is considered in advance, and a gap is formed between the foamed body and the split mold. The blow molding method for a resin hollow molded article according to claim 1.
あることを特徴とする請求項１または２記載の樹脂中空
成形品のブロー成形方法。3. The blow molding method for a resin hollow molded article according to claim 1, wherein the foam is made of the same material as the sheet parison.
質樹脂であることを特徴とする請求項１、２または３記
載の樹脂中空成形品のブロー成形方法。4. The blow molding method for a resin hollow molded article according to claim 1, wherein the pair of sheet parisons are made of the same material resin of different colors.
あって、少なくとも内層を同材質であることを特徴とす
る請求項１、２、３または４記載の樹脂中空成形品のブ
ロー成形方法。5. The blow molding method for a resin hollow molded article according to claim 1, wherein the pair of sheet parisons has a multilayer structure, and at least an inner layer is made of the same material.
面に当たる面に布などの表皮材が貼着されていることを
特徴とする請求項１、２、３、４または５記載の樹脂中
空成形品のブロー成形方法。6. A resin hollow molding according to claim 1, wherein a skin material such as cloth is adhered to a surface of the sheet-shaped parison which corresponds to a surface of the resin hollow molded product. Blow molding method for products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2291899A JP4270625B2 (en) | 1999-01-29 | 1999-01-29 | Panel blow molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2291899A JP4270625B2 (en) | 1999-01-29 | 1999-01-29 | Panel blow molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000218682A true JP2000218682A (en) | 2000-08-08 |
| JP4270625B2 JP4270625B2 (en) | 2009-06-03 |
Family
ID=12096034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2291899A Expired - Lifetime JP4270625B2 (en) | 1999-01-29 | 1999-01-29 | Panel blow molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4270625B2 (en) |
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