JP2002210809A - Hollow resin molding and its manufacturing method - Google Patents
Hollow resin molding and its manufacturing methodInfo
- Publication number
- JP2002210809A JP2002210809A JP2001009172A JP2001009172A JP2002210809A JP 2002210809 A JP2002210809 A JP 2002210809A JP 2001009172 A JP2001009172 A JP 2001009172A JP 2001009172 A JP2001009172 A JP 2001009172A JP 2002210809 A JP2002210809 A JP 2002210809A
- Authority
- JP
- Japan
- Prior art keywords
- rib
- pair
- resin molded
- hollow
- portions
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】吹込み成形された樹脂中空体
及び樹脂成形体を吹込み成形する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molded resin hollow body and a method for blow molding a resin molded body.
【0002】[0002]
【従来の技術】筒状のパリソンを金型で挟持して内部に
空気を吹き込み、中空成形品を製造する方法が知られて
いる。2. Description of the Related Art There is known a method of manufacturing a hollow molded article by sandwiching a cylindrical parison with a mold and blowing air into the parison.
【0003】平板状の軽量な樹脂パネルを製造するため
には、内部を中空・軽量にでき、10kgf/cm2内
外の吹込み圧に耐える程度の型締力の成形機を利用して
大きな投影面積の品物を成形できる点で、上記の方法が
好ましい。しかし、平板状の中空品は対向する平板部が
撓んで凹みやすく、剛性が得にくいとの問題がある。[0003] In order to manufacture a flat, lightweight resin panel, a large projection is made using a molding machine having a mold clamping force sufficient to make the inside hollow and lightweight and to withstand a blowing pressure of 10 kgf / cm 2 or more. The above method is preferable in that an article having an area can be formed. However, a flat hollow article has a problem in that the opposing flat plate portions are easily bent and dented, and it is difficult to obtain rigidity.
【0004】特開平9−193656号には、この中空
平板部の剛性を向上するため、補強リブを一体成形する
方法に関する記載がある。この公報に記載のものは、キ
ャビティの両側から縦板材(8a)を進退させ、圧着、
凹面を形成することなく補強リブを形成するものであ
る。Japanese Patent Application Laid-Open No. Hei 9-193656 describes a method of integrally forming a reinforcing rib to improve the rigidity of the hollow flat plate. According to this publication, the vertical plate material (8a) is advanced and retracted from both sides of the cavity,
The reinforcing rib is formed without forming a concave surface.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、この成
形法は、キャビティの両側の面から縦板をパリソンに押
し入れるため、クロスを挟んで成形品表面を加飾した好
ましい意匠面を有する中空体を一工程で成形することが
できない。また、クロスの貼り付けを行わない場合であ
っても、型キャビティ面に縦板と周辺の一般キャビティ
面との分割線が成形品の意匠面に転写されるため、見栄
えが損なわれるという問題もある。この場合は、意匠面
にシボを付与する場合にはシボパターンが不連続になる
ことになる。しかも溶融樹脂を局所的に進退させる結
果、その周縁部分との光沢に差異を生ずるとの問題もあ
る。したがって、上記従来の技術を適用して外観のよい
中空成形品を製造することが困難であった。また、前記
の補強リブの構造では剛性の向上はまだ不十分で、例え
ばフロアボードなどより強度が要求されるものには満足
できるものではない。However, in this molding method, since a vertical plate is pressed into the parison from both sides of the cavity, a hollow body having a preferable design surface in which the surface of the molded product is decorated with a cloth interposed therebetween is used. Cannot be molded in one step. Also, even when the cloth is not pasted, the dividing line between the vertical plate and the surrounding general cavity surface is transferred to the design surface of the molded product on the mold cavity surface, so that the appearance is impaired. is there. In this case, when a texture is provided on the design surface, the texture pattern becomes discontinuous. In addition, there is also a problem that as a result of the local advance and retreat of the molten resin, a difference in gloss from the peripheral portion occurs. Therefore, it has been difficult to produce a hollow molded article having a good appearance by applying the above-mentioned conventional technology. Further, the structure of the reinforcing ribs described above does not sufficiently improve the rigidity, and is not satisfactory, for example, for floor boards or the like that require higher strength.
【0006】本発明は、上記従来の課題を解決した中空
成形品およびその製造方法を提供することを目的とする
ものである。An object of the present invention is to provide a hollow molded article which solves the above-mentioned conventional problems and a method for producing the same.
【0007】[0007]
【課題を解決するための手段】本発明者は、前記課題を
解決するため、鋭意検討した結果、対向する一対の面部
に特定のリブを設けることが有効であることを見出し、
本発明に至った。Means for Solving the Problems The present inventor has conducted intensive studies in order to solve the above-mentioned problems, and as a result, has found that it is effective to provide specific ribs on a pair of opposing surfaces.
The present invention has been reached.
【0008】すなわち、本発明は、(1)対向する一対
の面部とそれを囲む側縁部との内側に閉じられた中空部
を有する樹脂成形体であって、前記一対の面部の一側内
面には、略端縁間を他側の面部に向けて前記中空部を延
びる第1のリブが形成され、少なくとも一部の前記第1
のリブは、前記他側の面部に当接される第2のリブを有
することを特徴とする樹脂成形体、(2)対向する一対
の面部とそれを囲む側縁部との内側に閉じられた中空部
を有する樹脂成形体であって、前記一対の面部の一側内
面には、略端縁間を他側の面部に向けて前記中空部を延
びる第1のリブが形成され、前記一対の面部の他側内面
には、一側の面部に向けて第3のリブが形成され、少な
くとも一部の前記第1のリブは、前記第3のリブに当接
されることを特徴とする樹脂成形体、(3)少なくとも
一部の第1のリブは第3のリブに当接する第2のリブを
有することを特徴とする、前記(2)記載の樹脂成形
体、(4)第1のリブは対向する側壁を有することを特
徴とする、前記(1)ないし(3)記載の樹脂成形体、
(5)前記側縁部の内面にリブを有する前記(1)〜
(4)のいずれかに記載の樹脂成形体、(6)対向する
一対の面部の内側に閉じられた中空部を有する樹脂成形
体の製造方法であって、内周面にビードを有する筒状の
予備成形体を押出し成形し、前記予備成形体を型キャビ
ティ内に収容し、対向する一対の一側の面部と他側の面
部とこれらの間の中空内部を一側の面部から他側の面部
に延びるリブを形成しながら、前記リブを前記ビードを
介して他側の面部と当接されるとともにリブと他側の面
部との間には流体通路を形成し、前記内部を流体加圧し
て面部をキャビティ面に圧接賦形することを特徴とする
樹脂成形体の製造方法、に関する。That is, the present invention provides (1) a resin molded article having a hollow portion closed inside a pair of opposing surface portions and a side edge portion surrounding the pair, and an inner surface of one side of the pair of surface portions. A first rib extending in the hollow portion so as to extend substantially between the edges toward the surface portion on the other side, and at least a portion of the first rib is formed.
The resin molded body has a second rib abutting on the other surface portion, (2) closed inside a pair of opposed surface portions and a side edge portion surrounding the pair. A resin molded body having a hollow portion, wherein a first rib is formed on an inner surface on one side of the pair of surface portions so as to extend the hollow portion toward a surface portion on the other side substantially between edges, and A third rib is formed on the other inner surface of the surface portion toward the one surface portion, and at least a part of the first rib is in contact with the third rib. (3) The resin molded article according to (2), wherein at least a part of the first rib has a second rib abutting on the third rib. The resin molded article according to any one of (1) to (3), wherein the rib has an opposed side wall.
(5) The above (1) to (5) having a rib on the inner surface of the side edge portion.
(6) A method for producing a resin molded body having a hollow portion closed inside a pair of opposing surface portions, wherein the resin molded body according to any one of (4) and (4) is a cylindrical shape having a bead on an inner peripheral surface. The preformed body is extruded, the preformed body is housed in a mold cavity, and a pair of opposing surfaces on one side and the other side and a hollow space between them are formed from one side to the other side. While forming a rib extending to the surface portion, the rib is brought into contact with the other surface portion via the bead, and a fluid passage is formed between the rib and the other surface portion, and the inside is pressurized with fluid. And a method for producing a resin molded body, wherein a surface portion is press-formed on a cavity surface.
【0009】[0009]
【発明の実施の形態】本発明の樹脂成形体の中空部はリ
ブが一側の面部から他側の面部に向かって形成される。
他側の面部には一体のキャビティ面を有する金型面が転
写され、キャビティ面からパリソンに向かって突出され
る縦板材などの痕跡を生じない。これは、意匠面として
好適な他側の面部においては、パリソンが延伸陥没され
再び復元されるなどの激しい動きを伴わないので、樹脂
の賦形過程における局所的な動きによる色調や光沢の変
化を生じることがなく、均一または連続的な変化の外観
になる。またそのような金型によれば、織布、不織布、
木目柄などを付与した樹脂シートなどを一体に貼り付け
ることも容易である。BEST MODE FOR CARRYING OUT THE INVENTION In the hollow portion of a resin molded article of the present invention, a rib is formed from one surface to another surface.
A mold surface having an integral cavity surface is transferred to the other surface portion, and no trace of a vertical plate material or the like protruding from the cavity surface toward the parison is generated. This is because, on the other side surface portion suitable as a design surface, there is no violent movement such as the parison being stretched and collapsed and restored again, so that the color tone and gloss change due to local movement in the resin shaping process are reduced. It does not occur and results in a uniform or continuous change appearance. According to such a mold, woven fabric, non-woven fabric,
It is also easy to integrally attach a resin sheet or the like provided with a grain pattern or the like.
【0010】第1のリブはキャビティ内に所定高さに立
設された固定的なコア部材によってもよいし、所定スト
ロークで出没可能なものによってもよい。所定ストロー
クは、第1のリブを形成するためのコア部材を金型のキ
ャビティ面と面一(フラッシュ・サーフェス)になるよ
うに後退させてもよいし、キャビティ面から突出状態に
なるように後退してもよい。また、キャビティ面よりも
さらに後退した状態とすることもできる。この場合に
は、一側の外方に突出する部分が形成され、これがリブ
に一体に補強された脚部として有用である。[0010] The first rib may be a fixed core member erected at a predetermined height in the cavity, or may be a member that can come and go with a predetermined stroke. For the predetermined stroke, the core member for forming the first rib may be retracted so as to be flush with the cavity surface of the mold (flash surface), or may be retracted so as to project from the cavity surface. May be. Further, it can be in a state further retreated than the cavity surface. In this case, a portion protruding outward on one side is formed, and this is useful as a leg integrally reinforced with the rib.
【0011】少なくとも一部の第1のリブは、必ず他側
の面部に接することを要する。少なくとも一部の第1の
リブは、パリソンの押出し成形時に一体に形成したビー
ド(第2のリブおよび/または第3のリブ)を介して他
側の面部に接することが重要である。第1のリブがビー
ド(第2のリブおよび/または第3のリブ)を介して他
側面部に接していないと、他側の面部が第1のリブで支
持されないため、中空成形体の剛性が得られず、押圧さ
れると面が下がってしまうからである。また、コア部材
を後退させる場合にあっては、第1のリブの先端形状が
成形過程で溶融状態にあるために動くことができるの
で、所定の形状が得られない。At least some of the first ribs must be in contact with the other surface. It is important that at least a part of the first rib is in contact with the surface on the other side via a bead (a second rib and / or a third rib) integrally formed during the extrusion of the parison. If the first rib is not in contact with the other side portion via the bead (the second rib and / or the third rib), the other side portion is not supported by the first rib, so that the rigidity of the hollow molded body is increased. Is not obtained, and the surface is lowered when pressed. Also, when the core member is retracted, the first rib cannot move because the distal end shape of the first rib is in a molten state in the molding process, so that a predetermined shape cannot be obtained.
【0012】ビードは一側の面にあっても、他側の面に
あっても、双方の面にあっても、さらにはこれらに加え
て面部を囲む側縁内部にあってもよい。一側の面にある
ときは、第1のリブを補強するとともに、少なくとも一
部のリブの先端部に突起を形成するから、この突起(第
2のリブ)で他側の面に当接する。突起のない箇所は他
側の面に接しないから流体通路が形成され、吹込み成形
に際しては少ない箇所、例えば1箇所からの吹き込みに
よって全体に流体圧を加えることができる。したがっ
て、流体圧が全体に均一にかかる。また、複数のブロー
ノズル(ブローピン)を要しないので、複雑な機構を要
しないから、設備コスト面でも好ましい。The bead may be on one side, on the other side, on both sides, or in addition, inside the side edges surrounding the surface. When it is on one side, the first rib is reinforced and a projection is formed on at least a part of the tip of the rib, so that the projection (second rib) abuts on the other side. Fluid passages are formed because portions without protrusions do not come into contact with the surface on the other side. Fluid pressure can be applied to all portions by blowing from a small portion, for example, one portion during blow molding. Therefore, the fluid pressure is uniformly applied throughout. Further, since a plurality of blow nozzles (blow pins) are not required, a complicated mechanism is not required, which is preferable in terms of equipment cost.
【0013】ビードは他側に形成されてもよい。この場
合には、他側、通常意匠面として利用される面の剛性を
高めることができる。また、ビード以外の場所は対向す
る面を接触させないようにして、流体通路とする。した
がって、上記一側と同様の作用を奏する。また、他側は
コア部材によらない吹込み成形においてもシンプルな樹
脂挙動による平坦な形状の賦形ができる。したがって、
ビードの延伸が少なく、補強効果が保持される。[0013] The beads may be formed on the other side. In this case, the rigidity of the other side, which is usually used as a design surface, can be increased. In addition, a fluid passage is formed in a place other than the bead so that the opposing surfaces are not in contact with each other. Therefore, the same operation as the one side is provided. Further, the other side can be formed into a flat shape by simple resin behavior even in blow molding not using a core member. Therefore,
There is little bead stretching and the reinforcing effect is maintained.
【0014】さらに、ビードを両側に形成した場合は、
基本的にこれらの効果が相加的に発現されるのでより好
ましい。ビードはさらに一対の面部を囲む周縁部の内面
に形成されてもよい。この場合には周縁部を補強するこ
とができる。Further, when beads are formed on both sides,
Basically, it is more preferable because these effects are expressed additively. The bead may further be formed on an inner surface of a peripheral portion surrounding the pair of surface portions. In this case, the periphery can be reinforced.
【0015】[0015]
【実施例】本願発明の好ましい実施例を説明する。図1
は車両Vの後部室内を示したもので、自動車の内装パネ
ルであるフロアボード1は、前後ボード2、3を組み合
わせラゲッジスペースLのフロア面Fを形成するもの
で、フロア面下にスペアタイヤSや工具Tなどを収容す
る凹部を覆っている。なお、インシュレータ4は凹部に
嵌めこまれ、前記スペアタイヤSや工具Tを収容する箇
所を除いて、フロア面Fに平行は上面部4aを有してい
る。インシュレータ4はポリプロピレンビーズを型内で
発泡させて成形したものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described. Figure 1
1 shows a rear interior of the vehicle V. A floor board 1, which is an interior panel of an automobile, forms a floor surface F of a luggage space L by combining front and rear boards 2, 3, and a spare tire S is provided below the floor surface. And a recess for accommodating the tool T and the like. The insulator 4 is fitted in the concave portion, and has an upper surface portion 4a parallel to the floor surface F except for a portion for accommodating the spare tire S and the tool T. The insulator 4 is formed by foaming polypropylene beads in a mold.
【0016】図1の前ボード2のA部を図2に示した。
図1に示されるように後ボード3は縁部をアーチ形に
し、引き上げフックが設けられる等、形状を多少異にす
るが、基本的にはボード2と同一の構造を採用してい
る。FIG. 2 shows part A of the front board 2 of FIG.
As shown in FIG. 1, the rear board 3 has a slightly different shape such as an arched edge and a lifting hook, but basically employs the same structure as the board 2.
【0017】前ボード2は図2においては下面22を上
向きに示してあり、周縁部24が額縁状をなして形成さ
れているほか、碁盤目状のリブ23、28が下面22の
ほぼ全面に亘って形成されている。すなわち格子状の溝
となって上面21に向かって突出している。In FIG. 2, the front board 2 has a lower surface 22 facing upward, a peripheral portion 24 is formed in a frame shape, and grid-like ribs 23, 28 are provided on almost the entire lower surface 22. It is formed over. That is, it is formed as a lattice-shaped groove and protrudes toward the upper surface 21.
【0018】前ボード2の長手方向の側縁24aに沿っ
てビード25が形成されている。上下面21,22の板
厚はおよそ2.0mm、ビード25の高さはおよそ0.
8mmで、前ボード2はポリプロピレン樹脂、ABS樹
脂、変性PPO樹脂などによる中空成形品で、上面21
に梨地シボを付しさらに帯状の突起21aを付して意匠
面としてある。A bead 25 is formed along the longitudinal side edge 24a of the front board 2. The plate thickness of the upper and lower surfaces 21 and 22 is approximately 2.0 mm, and the height of the bead 25 is approximately 0.2 mm.
8 mm, the front board 2 is a hollow molded article made of polypropylene resin, ABS resin, modified PPO resin, etc.
And a belt-like projection 21a is provided thereon to provide a design surface.
【0019】次に成形方法を説明する。図3はブロー成
形機のヘッド部分10を示しており、図3(a)は、図
示しないスクリュー式押出装置のアキュムレータから送
られる溶融樹脂を筒状に吐出するためのダイス11及び
ノズル12で、ノズル12は下降してリング状の吐出口
14が開いた状態になっている。ノズル12の端縁部1
5には円筒面状をなす切欠部16が所定の間隔で全周に
亘り形成されている。アキュムレータから送られた樹脂
は、図3(b)に示すように、吐出口14の開口形状に
倣った断面形状を持つ筒状のパリソンPを形成する。す
なわち、上下方向に連続するビードBが内周面に切欠部
16相当箇所において形成されたものとなる。Next, a molding method will be described. FIG. 3 shows a head portion 10 of a blow molding machine. FIG. 3A shows a die 11 and a nozzle 12 for discharging molten resin sent from an accumulator of a screw type extruder (not shown) into a cylindrical shape. The nozzle 12 is lowered to open the ring-shaped discharge port 14. Edge 1 of nozzle 12
5, a notch 16 having a cylindrical surface is formed over the entire circumference at a predetermined interval. The resin sent from the accumulator forms a cylindrical parison P having a cross-sectional shape following the opening shape of the discharge port 14 as shown in FIG. That is, a bead B that is continuous in the up-down direction is formed at a position corresponding to the notch 16 on the inner peripheral surface.
【0020】なお、パリソンPは板厚2.5〜4mm、
実施例では3.0mm、ビードBの高さは1.0〜1.
8mm、実施例のものは1.5mmである。The parison P has a thickness of 2.5 to 4 mm,
In the embodiment, the height of the beads B is 3.0 to 1.0 mm.
8 mm and 1.5 mm in the embodiment.
【0021】次に、図4は、金型上方から見たその横断
面説明図である。図4に横断面で示すように、成形型3
0の一対の金型31,32のキャビティ31c、32c
の間にパリソンPを降ろす。キャビティ31cにはコア
部材33が金型32のキャビティ32cに向けて形成さ
れている。なお、説明の容易化のため、横方向に形成し
たコア部材33のみを示し、縦方向のコア部材は省略し
た。成形型30がパリソンPに接触する前に、パリソン
Pの下方の端末を通常の方法で挟んで平らに潰し、開口
を閉じる。金型31側には図示しない矢印D1方向に前
進可能なブローピンが用意され、閉じられたパリソンP
の内圧を僅かに高める、いわゆるプリブローを行う。FIG. 4 is an explanatory cross-sectional view of the mold as viewed from above. As shown in cross section in FIG.
0 cavities 31c, 32c of a pair of molds 31, 32
Drop parison P in between. A core member 33 is formed in the cavity 31c toward the cavity 32c of the mold 32. For ease of explanation, only the core member 33 formed in the horizontal direction is shown, and the core member in the vertical direction is omitted. Before the mold 30 comes into contact with the parison P, the terminal below the parison P is pinched and crushed flat by a usual method, and the opening is closed. A blow pin, which can be advanced in the direction of arrow D1 (not shown), is provided on the mold 31 side.
The so-called pre-blow is performed to slightly increase the internal pressure of the air conditioner.
【0022】パリソンPを中心に金型31,32をそれ
ぞれD1、D2方向に動かし、成形型30を閉じる。The molds 31 and 32 are moved around the parison P in the directions D1 and D2, respectively, and the mold 30 is closed.
【0023】図5は型閉め開始後コア部材33がパリソ
ンに突き当たるときの金型横断面説明図である。FIG. 5 is an explanatory cross-sectional view of the die when the core member 33 abuts against the parison after the start of closing the die.
【0024】図5に示すように、型閉め過程でコア部材
33がパリソンPの側壁に当たって内部に陥入され、ビ
ードBはコア部材33に沿って波形に延伸される。パリ
ソンPはコア部材33によってD1方向に振られ、金型
32のキャビティ32c内面に押し当てられる。パリソ
ンPはコア部材33およびキャビティ32cの中央部で
先に接触し、端末にかけて順に接触してゆき、完全に成
形型30が閉じると同時にブロー圧を高め、例えば8k
gf/cm2のエアーを吹き込みパリソンPをキャビテ
ィ31c、32c面に押し当てて中空に賦形する(図
6)。なお、図6においては説明のためにビード25同
士が対面した場合を示している。ビード25が内面に形
成されており、このビード25は対向する面のビード2
5と接触し、溶着されて、前ボード2の強度を高める。
すなわち、フロア面Fのペコつきをなくすことができ
る。また、ビード25間のリブ23の先端部は上面21
に対して隙間26を持つので、リブ23は内部にさらに
閉鎖した空間を形成せず、前ボード2は内部が構造的に
仕切られて強化されつつも、単一の空間を形成するた
め、この空間の一箇所から吹き込むことによって、全体
にエアー圧を加えて成形できる。したがって、単一のブ
ローピンから吹き込むだけでよく、複雑な装置を必要と
しない。また、前ボード2を水洗いする場合を想定すれ
ば、一箇所、すなわち前記ブローピンを刺し込んだ箇所
のみをシールするだけでよい。したがって、ラゲッジフ
ロア用のフロアボードとして使い勝手を容易に向上でき
る。なお、先にも付言したように、図4では、説明のた
めにリブ23を形成するためのコア部材33を横方向の
み図示した。しかし、この実施例では、図2に示したと
おり、コア部材33は縦横に配されるものであり、した
がって、成形過程におけるビードBの挙動はさらに複雑
である。すなわち、横方向のコア部材33に加え、縦方
向のコア部材がパリソンPに陥入され、その位置がビー
ドBの中央に対応する位置となる場合もあり、またビー
ドBの左側傾斜面に位置する場合あり、その逆に右側傾
斜面に位置する場合もある。したがって、格子状のコア
部材がビードBの形成されたパリソンPの一面に押し当
てられる場合、コア部材とビード25との相対位置関係
は一様ではない。As shown in FIG. 5, the core member 33 hits the side wall of the parison P during the mold closing process and is indented inside, and the bead B is stretched in a corrugated manner along the core member 33. The parison P is swung in the D1 direction by the core member 33 and pressed against the inner surface of the cavity 32c of the mold 32. The parison P first comes into contact at the center of the core member 33 and the cavity 32c, and then contacts the terminal in order, and at the same time when the mold 30 is completely closed, the blow pressure is increased.
Air of gf / cm 2 is blown, and the parison P is pressed against the surfaces of the cavities 31c and 32c to form a hollow shape (FIG. 6). FIG. 6 shows a case where the beads 25 face each other for explanation. A bead 25 is formed on the inner surface, and this bead 25 is
5 and is welded to increase the strength of the front board 2.
That is, it is possible to eliminate the sticking of the floor surface F. The tip of the rib 23 between the beads 25 is located on the upper surface 21.
, The ribs 23 do not form a further closed space inside, and the front board 2 forms a single space while the interior is structurally partitioned and reinforced, while the ribs 23 form a single space. By blowing from one place in the space, molding can be performed by applying air pressure to the whole. Therefore, it is only necessary to blow from a single blow pin, and no complicated device is required. Further, assuming that the front board 2 is to be washed with water, it is only necessary to seal only one location, that is, the location where the blow pin has been inserted. Therefore, usability can be easily improved as a floor board for a luggage floor. As described above, in FIG. 4, the core member 33 for forming the rib 23 is illustrated only in the lateral direction for explanation. However, in this embodiment, as shown in FIG. 2, the core members 33 are arranged vertically and horizontally, so that the behavior of the beads B in the molding process is more complicated. That is, in addition to the horizontal core member 33, the vertical core member may be recessed into the parison P, and the position may be a position corresponding to the center of the bead B, or may be located on the left inclined surface of the bead B. In some cases, and conversely, it may be located on the right inclined surface. Therefore, when the lattice-shaped core member is pressed against one surface of the parison P on which the beads B are formed, the relative positional relationship between the core member and the beads 25 is not uniform.
【0025】たとえば、リブ23、28の先端部ではコ
ア部材33との相対的動き(ずれ)が殆んど生じないた
め、ビードがリブ23、28の先端部にある場合にはビ
ードの高さは維持される。また、縦方向のコア部材がビ
ードの傾斜面を延伸する場合にはリブ23の板厚を補う
ように作用する。したがって、縦方向のコア部材により
形成されるリブ23は、図2においてCに示すように対
向するビード同士が当接する場合を除き、ブローピンか
ら吹き込まれる流体が中空部全体にわたって流れるよう
に、対向面21との間に隙間26を有する。そして、ビ
ードB二つ分より僅かに狭い寸法に隙間26の寸法を設
定してやることができる。前ボード2は、この成形体の
外周のバリ27をカッターで切除して完成される。For example, at the tips of the ribs 23 and 28, there is almost no relative movement (shift) with respect to the core member 33. Therefore, when the bead is located at the tips of the ribs 23 and 28, the height of the bead is high. Is maintained. When the core member in the vertical direction extends on the inclined surface of the bead, it acts so as to compensate for the thickness of the rib 23. Therefore, the ribs 23 formed by the vertical core members are arranged so that the fluid blown from the blow pins flows over the entire hollow portion except when the opposing beads contact each other as shown in FIG. 2C. A gap 26 is provided between the gap 21 and the gap 21. Then, the size of the gap 26 can be set to a size slightly smaller than the size of the two beads B. The front board 2 is completed by cutting off burrs 27 on the outer periphery of the molded body with a cutter.
【0026】なお、以上の実施例にあっては、ノズル1
2の全周に切欠部16を形成させたヘッドを用いたが、
切欠部16は必ずしも全周に設けられる必要はない。In the above embodiment, the nozzle 1
2, a notch 16 was formed on the entire circumference.
The notch 16 does not necessarily need to be provided on the entire circumference.
【0027】例えば、前ボード2の上面21側に対応す
る位置に限定して設けることができるし、あるいは下面
22側に対応する位置に限定して設けてもよいし、さら
には、上下面21,22の幅の一部分にビード25を形
成できるように設けてもその効果が発現できる。For example, it may be provided only at a position corresponding to the upper surface 21 side of the front board 2, may be provided only at a position corresponding to the lower surface 22 side, and , 22 can provide the effect even if it is provided so as to form a bead 25 at a part of the width.
【0028】図7は他の実施例である。金型32のキャ
ビティ32cに予備賦形した表皮29を置き、一体にブ
ロー成形する。表皮はジャージ地にポリプロピレン樹脂
の不織布をバッキングしたもので、真空成形してキャビ
ティ32cの形状に合わせて予備賦形されている。FIG. 7 shows another embodiment. The preformed skin 29 is placed in the cavity 32c of the mold 32, and is integrally blow-molded. The outer skin is made of a jersey fabric backed with a nonwoven fabric of polypropylene resin, and is preliminarily shaped according to the shape of the cavity 32c by vacuum forming.
【0029】成形工程は上記先の実施例と同様である。
一体に成形した後、バリとともに表皮29の余部29a
を切除して成形を完了する。The molding process is the same as in the previous embodiment.
After being integrally molded, with the burr, the surplus portion 29a of the skin 29
Is cut off to complete the molding.
【0030】このように、一側が単純な平坦面であるの
で、加飾材を組み合せた一体成形も容易に行え、見栄え
を向上できる。As described above, since one side is a simple flat surface, it is easy to integrally form the decorative material in combination, and the appearance can be improved.
【0031】図8はさらに他の実施例である。図8は、
金型40の縦断面説明図である。FIG. 8 shows still another embodiment. FIG.
FIG. 3 is an explanatory longitudinal sectional view of a mold 40.
【0032】コア部材43に図示しない駆動機構を連結
させてあり、金型40を開いた状態では、コア部材43
を金型41に前進限で止めてある。したがって、成形型
30における成形工程の前半と同じ工程で成形を行う。
この実施例の特徴は、金型40が閉じた直後、コア部材
43を後退させる点にある。コア部材43を後退させる
態様としては、図9(a)に示すように、金型41のキ
ャビティ41cの表面に先端が一致するように後退させ
る場合、図9(b)のように、キャビティ41cよりも
突出させた状態で、すなわちコア部材43をパリソンP
内に残す場合、あるいは、図9(c)のように、コア部
材43をキャビティ41cの表面からさらに後退させる
場合がある。A driving mechanism (not shown) is connected to the core member 43. When the mold 40 is opened, the core member 43 is opened.
Is stopped at the forward end of the mold 41. Therefore, molding is performed in the same step as the first half of the molding step in the molding die 30.
This embodiment is characterized in that the core member 43 is retracted immediately after the mold 40 is closed. As shown in FIG. 9A, when the core member 43 is retracted so that the tip thereof coincides with the surface of the cavity 41c of the mold 41, as shown in FIG. In a state where the core member 43 is protruded from the
In some cases, as shown in FIG. 9C, the core member 43 may be further retracted from the surface of the cavity 41c.
【0033】リブ53において、ブロー圧によってコア
部材43の存在しない箇所は押し潰されて中実になる。
図9(d)はリブ53を対向するパリソンに当てずにブ
ローした状態を示し、コア部材43が抜けた後のリブは
自重で垂れ下がり、あるいはブローエアーに吹き動かさ
れて位置が定まらず、補強効果を生じない。In the rib 53, the portion where the core member 43 does not exist is crushed by the blow pressure and becomes solid.
FIG. 9 (d) shows a state in which the rib 53 is blown without hitting the opposing parison, and the rib after the core member 43 comes off hangs down by its own weight, or is blown by the blow air, and the position is not determined. Has no effect.
【0034】以上のリブ53がビード55に当てられ、
リブ53が位置決めされるとともに、ビード55が存在
する箇所で連結され、それ以外の箇所はブロー圧が加わ
る隙間26となるため、一のブローポイントから吹き込
むことによって全体を膨らますことができる。The above ribs 53 are applied to the beads 55,
The ribs 53 are positioned and connected at the locations where the beads 55 are present, and the other locations are the gaps 26 to which the blow pressure is applied, so that the entirety can be expanded by blowing from one blow point.
【0035】[0035]
【発明の効果】以上説明した通り、本願発明によれば、
軽量で強度の大きく外観のよい樹脂中空成形体が得ら
れ、そのような樹脂中空成形体をシンプルな工程により
製造することができる。As described above, according to the present invention,
A light-weight, high-strength resin hollow molded article having a good appearance can be obtained, and such a resin hollow molded article can be manufactured by a simple process.
【図1】自動車内装パネルのフロアボードの説明図。FIG. 1 is an explanatory view of a floor board of an automobile interior panel.
【図2】本発明の実施例を示すもので、フロアボードの
部分断面説明図。FIG. 2, showing an embodiment of the present invention, is a partial cross-sectional explanatory view of a floorboard.
【図3】本発明の製造方法に使用する予備成形体(パリ
ソン)の成形法の説明図であって、(a)はその成形用
ダイスとノズルの説明図、(b)は(a)のダイスとノ
ズルから押出されたビード付きパリソンの説明図。FIG. 3 is an explanatory view of a method of forming a preform (parison) used in the manufacturing method of the present invention, wherein (a) is an explanatory view of a forming die and a nozzle, and (b) is an explanatory view of (a). Explanatory drawing of a parison with a bead extruded from a die and a nozzle.
【図4】吹き込み成形による本発明の実施例の説明図で
あって、金型に予備成形体(パリソン)を充填する状態
を金型上方から見た横断面説明図。FIG. 4 is an explanatory view of an embodiment of the present invention by blow molding, and is a cross-sectional explanatory view of a state in which a mold is filled with a preform (parison) as viewed from above the mold.
【図5】吹き込み成形による本発明の実施例の説明図で
あって、型閉め開始後コア部材33がパリソンに突き当
たる状態を説明する金型横断面説明図。FIG. 5 is an explanatory view of an embodiment of the present invention by blow molding, and is a cross-sectional explanatory view of a mold for explaining a state in which a core member 33 abuts against a parison after the mold closing is started.
【図6】吹き込み成形による本発明の実施例の説明図で
あって、(c)は型閉め後、吹き込み成形した状態を説
明する金型横断面説明図。FIG. 6 is an explanatory view of an embodiment of the present invention by blow molding, and FIG. 6 (c) is a cross-sectional view of a mold for explaining a state of blow molding after closing the mold.
【図7】本発明の他の実施例を説明する金型横断面説明
図。FIG. 7 is an explanatory cross-sectional view of a mold for explaining another embodiment of the present invention.
【図8】本発明のさらに他の実施例を説明する金型縦断
面説明図。FIG. 8 is an explanatory longitudinal sectional view of a mold for explaining still another embodiment of the present invention.
【図9】コア部材43の後退の態様を説明するもので、
(a)はキャビティ表面に先端が一致する場合、(b)
はキャビティ表面から突出させる場合、(c)はキャビ
ティ表面からさらに後退させる場合、(d)はリブ53
を対向するパリソンに当接させない状態で吹き込み成形
した場合をそれぞれ説明する金型縦断面説明図。FIG. 9 is a view for explaining a mode of retreat of the core member 43;
(A) is when the tip coincides with the cavity surface, (b)
Is to protrude from the cavity surface, (c) is to further retreat from the cavity surface, (d) is the rib 53
FIG. 4 is a vertical cross-sectional view of a mold for explaining a case where blow molding is performed in a state in which the sheet is not brought into contact with an opposing parison.
Claims (6)
との内側に閉じられた中空部を有する樹脂成形体であっ
て、前記一対の面部の一側内面には、略端縁間を他側の
面部に向けて前記中空部を延びる第1のリブが形成さ
れ、少なくとも一部の前記第1のリブは、前記他側の面
部に当接される第2のリブを有することを特徴とする樹
脂成形体。1. A resin molded body having a hollow portion closed inside a pair of opposed face portions and a side edge portion surrounding the pair of face portions, wherein one side inner face of the pair of face portions has a substantially A first rib extending in the hollow portion toward the other surface portion, and at least a portion of the first rib has a second rib abutting on the other surface portion. Characterized resin molded product.
との内側に閉じられた中空部を有する樹脂成形体であっ
て、前記一対の面部の一側内面には、略端縁間を他側の
面部に向けて前記中空部を延びる第1のリブが形成さ
れ、前記一対の面部の他側内面には、一側の面部に向け
て第3のリブが形成され、少なくとも一部の前記第1の
リブは、前記第3のリブに当接されることを特徴とする
樹脂成形体。2. A resin molded body having a hollow portion closed inside a pair of opposed face portions and a side edge portion surrounding the pair of face portions, wherein one side inner surface of the pair of face portions has a substantially A first rib extending toward the other surface portion is formed in the hollow portion, and a third rib is formed on the other inner surface of the pair of surface portions toward the one surface portion, and at least a part thereof is formed. Wherein said first rib is in contact with said third rib.
ブに当接する第2のリブを有することを特徴とする、請
求項2記載の樹脂成形体。3. The resin molded product according to claim 2, wherein at least a part of the first rib has a second rib abutting on the third rib.
を特徴とする、請求項1ないし3記載の樹脂成形体。4. The resin molded product according to claim 1, wherein the first rib has opposed side walls.
1〜4のいずれかに記載の樹脂成形体。5. The resin molded product according to claim 1, wherein a rib is provided on an inner surface of the side edge portion.
との内側に閉じられた中空部を有する樹脂成形体の製造
方法であって、内周面にビードを有する筒状の予備成形
体を押出し成形し、前記予備成形体を型キャビティ内に
収容し、対向する一対の一側の面部と他側の面部とこれ
らの間の中空内部を一側の面部から他側の面部に延びる
リブを形成しながら、前記リブを前記ビードを介して他
側の面部と当接されるとともにリブと他側の面部との間
には流体通路を形成し、前記内部を流体加圧して面部を
キャビティ面に圧接賦形することを特徴とする樹脂成形
体の製造方法。6. A method for producing a resin molded body having a hollow portion closed inside a pair of opposing surface portions and a side edge portion surrounding the pair of surface portions, the cylindrical preforming having a bead on an inner peripheral surface. The body is extruded, the preformed body is housed in a mold cavity, and a pair of opposing one-side surface portions and the other-side surface portion and a hollow interior therebetween extend from one side surface portion to the other side surface portion. While forming the rib, the rib is brought into contact with the other surface portion via the bead, and a fluid passage is formed between the rib and the other surface portion. A method for producing a resin molded body, comprising press-forming the cavity surface.
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JP2001009172A JP4430252B2 (en) | 2001-01-17 | 2001-01-17 | Hollow resin molded body and method for producing the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2001009172A JP4430252B2 (en) | 2001-01-17 | 2001-01-17 | Hollow resin molded body and method for producing the same |
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JP2002210809A true JP2002210809A (en) | 2002-07-31 |
JP4430252B2 JP4430252B2 (en) | 2010-03-10 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009069789A1 (en) * | 2007-11-30 | 2009-06-04 | Kyoraku Co., Ltd. | Double-walled hollow panel and vehicle interior panel produced using the panel |
US9174382B2 (en) | 2011-01-12 | 2015-11-03 | Salflex Polymers Ltd. | Hollow article with pillar structural members |
-
2001
- 2001-01-17 JP JP2001009172A patent/JP4430252B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009069789A1 (en) * | 2007-11-30 | 2009-06-04 | Kyoraku Co., Ltd. | Double-walled hollow panel and vehicle interior panel produced using the panel |
US8376453B2 (en) | 2007-11-30 | 2013-02-19 | Kyoraku Co., Ltd. | Hollow double-walled panel and interior panel for vehicle made using same |
JP5307026B2 (en) * | 2007-11-30 | 2013-10-02 | キョーラク株式会社 | Hollow double wall panel and vehicle interior panel made using the same |
US9174382B2 (en) | 2011-01-12 | 2015-11-03 | Salflex Polymers Ltd. | Hollow article with pillar structural members |
US10357934B2 (en) | 2011-01-12 | 2019-07-23 | Abc Technologies Inc. | Hollow article with pillar structural members |
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JP4430252B2 (en) | 2010-03-10 |
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