JP2011104839A - Multilayered molded product and method for molding the molded product - Google Patents
Multilayered molded product and method for molding the molded product Download PDFInfo
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- JP2011104839A JP2011104839A JP2009261119A JP2009261119A JP2011104839A JP 2011104839 A JP2011104839 A JP 2011104839A JP 2009261119 A JP2009261119 A JP 2009261119A JP 2009261119 A JP2009261119 A JP 2009261119A JP 2011104839 A JP2011104839 A JP 2011104839A
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Abstract
Description
本発明は、一次成形部材の表面に二次成形層、あるいはさらに三次成形層を形成した多層成形品及びその成形方法に関する。 The present invention relates to a multilayer molded article in which a secondary molded layer or a tertiary molded layer is formed on the surface of a primary molded member, and a molding method therefor.
色の異なる樹脂を同一金型キャビティ内に射出する二色成形方法や一次成形部材の表面に二次層を注入又は射出等する多層成形においては、樹脂が流れ合流するウエルド部、あるいは充填末端部からガス抜きを図る必要がある。
キャビティ内からガス抜きが不充分の場合には、図４に「ｃ」で示すようにガスの逃げ場がなくなり、ガス溜まりによる外観不良が発生する。
例えば特許文献１には、キャビティ内の樹脂の最終合流位置にガス抜き機構を設けた技術を開示し、特許文献２には、一次成形時に肉厚部を形成し、この肉厚部を冷却手段で冷却することで収縮させ、二次成形材料のガス排出部を形成する技術を開示する。
しかし、多層成形にて二次材料の厚みは薄く、一次成形部材との隙間のバラツキも大きいため、二次材料の注入合流部を所定の位置に定めるのが難しく、特許文献１の方法は適用できない。
また、特許文献２に示す肉厚部は形成できる部位に制限があり、型構造も複雑になるため実用的ではない。
In a two-color molding method in which resins of different colors are injected into the same mold cavity or in a multilayer molding in which a secondary layer is injected or injected onto the surface of a primary molding member, the welded portion where the resin flows and merges, or the filling end It is necessary to vent gas from
When the gas is not sufficiently vented from the cavity, there is no gas escape as shown by “c” in FIG.
For example, Patent Document 1 discloses a technique in which a gas venting mechanism is provided at the final joining position of the resin in the cavity, and Patent Document 2 forms a thick part at the time of primary molding, and this thick part is cooled by a cooling unit. A technique for forming a gas discharge part of a secondary molding material by contracting by cooling with a gas is disclosed.
However, since the thickness of the secondary material is thin in multilayer molding and the gap between the primary molding member is large, it is difficult to determine the injection and joining portion of the secondary material at a predetermined position, and the method of Patent Document 1 is applied. Can not.
Further, the thick part shown in Patent Document 2 is not practical because there is a limit to the part that can be formed and the mold structure is complicated.
本発明は、一次成形部材の表面部に二次成形材料を注入し、多層成形した製品において表面外観品質に優れた多層成形品及びその成形方法の提供を目的とする。 An object of the present invention is to provide a multilayer molded product having excellent surface appearance quality in a multilayer molded product by injecting a secondary molding material into a surface portion of a primary molded member and a molding method thereof.
本発明に係る多層成形方法は、一次成形部材の表面部に二次成形材料を注入し多層成形する多層成形方法であって、一次成形部材の基材に開口部を予め形成し、二次成形材料の注入時に前記開口部を当該二次成形材料のガス逃げ部として作用させたことを特徴とする。
ここで一次成形部材は、一層のみならず複層からなる樹脂部材であってもよいことから、多層成形と表現した。
また、一次成形部材の基材に設けた開口部に限定したのは、製品の形状として元々、求められている開口部は本発明における一次成形部材の開口部に含まれない趣旨である。
従って、一次成形部材の基材に予め形成した開口部は多層成形品の状態で表面部から見えない開口部をいう。
二次成形材料の注入方法は、射出成形に限らずインジェクター等を用いた高圧注入でもよい。
また、一次成形部材の表面部とは、外観意匠として必要な表面部をいい、特に一次成形部材の片面の多くあるいは殆どの部分が表面部となる場合に本発明が効果的である。
A multilayer molding method according to the present invention is a multilayer molding method in which a secondary molding material is injected into a surface portion of a primary molding member and multilayer molding is performed, and an opening is previously formed in a base material of the primary molding member, and secondary molding is performed. The opening is made to act as a gas escape portion of the secondary molding material when the material is injected.
Here, the primary molded member may be a resin member composed of not only one layer but also a plurality of layers, and is expressed as multilayer molding.
Further, the reason for limiting to the opening provided in the base material of the primary molded member is that the opening originally required as the shape of the product is not included in the opening of the primary molded member in the present invention.
Therefore, the opening formed in advance in the base material of the primary molded member refers to an opening that cannot be seen from the surface in the state of a multilayer molded product.
The injection method of the secondary molding material is not limited to injection molding, and may be high pressure injection using an injector or the like.
Further, the surface portion of the primary molded member refers to a surface portion necessary as an appearance design, and the present invention is effective particularly when most or most of one side of the primary molded member is a surface portion.
一次成形部材の基材に形成した開口部は、二次成形材料を注入する工程にて生じるガスの逃げ部として作用させるものであることから、前記一次成形部材の開口部は、二次成形材料の注入時に充填末端部又はウエルド部となる部位に形成してあるのが好ましい。
ここでウエルド部とは、注入した樹脂の流れ先端同士の合流部をいう。
Since the opening formed in the base material of the primary molding member is to act as an escape portion of the gas generated in the step of injecting the secondary molding material, the opening of the primary molding member is the secondary molding material. It is preferably formed at a portion that becomes a filling end portion or a weld portion at the time of injection.
Here, the weld portion refers to a joining portion between flow tips of injected resin.
本発明に係る多層成形品は、上記の方法で成形したものであり、一次成形部材の基材に開口部を形成してあり、二次成形層が前記開口部の少なくとも表面部側を塞いであることを特徴とする。 The multilayer molded product according to the present invention is formed by the above method, and an opening is formed in the base material of the primary molded member, and the secondary molded layer blocks at least the surface portion side of the opening. It is characterized by being.
本発明にあっては、二次成形材料の注入時に発生するガスの逃げ部を、一次成形部材の基材に設けた開口部としたことにより、二次成形にて形成された表面部にガス溜まり等による外観欠陥が生じるのを抑え、外観品質に優れた多層成形品が得られる。
また、金型構造も簡単であり、生産性にも優れる。
In the present invention, the escape portion of the gas generated when the secondary molding material is injected is an opening provided in the base material of the primary molding member, so that the gas is formed on the surface portion formed by the secondary molding. Appearance defects due to accumulation and the like are suppressed, and a multilayer molded article having excellent appearance quality can be obtained.
In addition, the mold structure is simple and the productivity is excellent.
本発明に係る多層成形品の用途に限定はないが、一次成形部材をポリプロピレン（ＰＰ）樹脂、硬質ウレタン樹脂、硬質塩化ビニル樹脂等の比較的硬質で強度の高い樹脂材料を用いた場合に製品全体の強度は確保しやすいが、表面が硬く、手触り品質に劣るので、表面部を軟質の熱可塑性エラストマー材料等で被覆することで表面が柔らかい内装品等としての高級感を得る用途に効果的である。 There is no limitation on the use of the multilayer molded product according to the present invention, but the product is produced when a relatively hard and high-strength resin material such as polypropylene (PP) resin, hard urethane resin, or hard vinyl chloride resin is used as the primary molded member. Although the overall strength is easy to secure, the surface is hard and inferior in touch quality, so it is effective in applications that provide a high-class feeling as an interior product with a soft surface by covering the surface with a soft thermoplastic elastomer material, etc. It is.
本発明者らは、本発明の効果を確認、検証すべく、図３に示すような自動車の内装部品として使用されるドアトリムを試作評価したので以下説明する。 In order to confirm and verify the effect of the present invention, the present inventors have made a trial evaluation of a door trim used as an interior part of an automobile as shown in FIG.
ドアトリムのような比較的大きく、複雑な凹凸形状を有する製品の場合には、流動性の高い熱可塑性エラストマーを二次注入材料に用いたとしてもドアトリムの表面部（車内側）全体に射出被覆するのは難しく、ＰＰ樹脂で成形した一次成形部材と金型の間に０．１〜１．５ｍｍ程度の隙間を形成し、熱可塑性エラストマーを射出注入すると、図４に示すように充填末端部付近にガス溜まりによる外観不良が発生した。
そこで、この充填末端部付近に対応して一次成形品に開口部を形成して試作した。
In the case of a product with a relatively large and complicated uneven shape such as a door trim, even if a highly fluid thermoplastic elastomer is used as a secondary injection material, it is injection-coated on the entire surface of the door trim (inside the vehicle). It is difficult to form a gap of about 0.1 to 1.5 mm between the primary molded member molded with PP resin and the mold, and when the thermoplastic elastomer is injected and injected, as shown in FIG. An appearance defect due to gas accumulation occurred.
Therefore, an opening was formed in the primary molded product corresponding to the vicinity of the filling end portion, and a prototype was made.
試作に用いた金型構造例を図１に模式的に示す。
固定型１と可動型２にてキャビティ３を形成し、一次成形部材の基材に開口部が形成されるように例えば図１では固定型１側に突部５を形成する。
突部５の形状や大きさは、二次成形材料のガス逃げに必要な大きさで且つ二次成形材の注入時に少なくとも表面部側がこの二次成形材料で塞がれる大きさである。
一次成形部材の肉厚によっても設定が異なるが、開口面積で３ｍｍ２〜４００ｍｍ２の範囲である。
また、開口部の数も二次成形材料で塞がれる範囲で制限がない。
図１（ａ）の金型を用いてスプルー４からＰＰ樹脂を射出成形した。
これにより、図１（ｂ）に示すように一次成形部材１１の基材に開口部１１ａが形成される。
次に図１（ｂ）に示すように一次成形部材が型内に残る可動型２と、固定型１ａとの間に二次成形材料を注入する隙間を形成し、その隙間に注入部６から熱可塑性エラストマーを注入（射出）した。
なお、図１（ｂ）において二次成形層の厚みを分かりやすくするために実際よりも大きく表現してあり、実際には、０．１〜２．０ｍｍの範囲であり、好ましくは０．３〜１．０ｍｍ程度である。
多くの場合に一次成形部材の基材に開口部を形成するだけで、その開口部に二次成形時のガスが逃げ、二次成形層の外観表面が均一で良好に成形されるが、例えば図１（ｂ）に想像線で模式的に表現したように開口部から金型を経由したガス抜き機構２ａを設けるとさらに表面品質が向上する。
FIG. 1 schematically shows an example of a mold structure used in the trial production.
A cavity 3 is formed by the fixed mold 1 and the movable mold 2 and, for example, a protrusion 5 is formed on the fixed mold 1 side in FIG. 1 so that an opening is formed in the base material of the primary molding member.
The shape and size of the protrusion 5 is a size necessary for gas escape of the secondary molding material, and at least a surface portion side is closed with the secondary molding material when the secondary molding material is injected.
Although set by the thickness of the primary molded member is different, in the range of 3mm 2 ~400mm 2 in the opening area.
Further, the number of openings is not limited as long as it is covered with the secondary molding material.
PP resin was injection molded from the sprue 4 using the mold shown in FIG.
Thereby, as shown in FIG.1 (b), the
Next, as shown in FIG. 1 (b), a gap for injecting the secondary molding material is formed between the movable mold 2 in which the primary molding member remains in the mold and the fixed mold 1a. A thermoplastic elastomer was injected (injected).
In addition, in FIG.1 (b), in order to make the thickness of a secondary shaping | molding layer easy to understand, it represents larger than actual, and is actually the range of 0.1-2.0 mm, Preferably it is 0.3. About 1.0 mm.
In many cases, only by forming an opening in the base material of the primary molding member, the gas at the time of secondary molding escapes to the opening, and the outer surface of the secondary molding layer is uniformly and satisfactorily molded. As schematically shown by imaginary lines in FIG. 1B, the surface quality is further improved by providing the
図２（ａ）は図３に示した多層成形品１０のＡ部の断面図で、図２（ｂ）は外観図である。
二次成形材料の充填末端部が一次成形部材に形成した開口部１１ａに流れ込み、その際にガスがこの開口部に逃げ、外観は図２（ｂ）に示すように開口部が見えず、均一で良好な外観品質となった。
2A is a cross-sectional view of part A of the multilayer molded product 10 shown in FIG. 3, and FIG. 2B is an external view.
The filling end portion of the secondary molding material flows into the opening 11a formed in the primary molding member, and at that time, the gas escapes to the opening, and the appearance is uniform as shown in FIG. With good appearance quality.
１ 固定型
１ａ 固定型
２ 可動型
３ キャビティ
４ スプルー
５ 突部
６ 注入部
１０ 多層成形品
１１ 一次成形部材
１１ａ 開口部
１２ 二次成形層
DESCRIPTION OF SYMBOLS 1 Fixed type | mold 1a Fixed type | mold 2 Movable type | mold 3 Cavity 4 Sprue 5 Protrusion part 6 Injection | pouring part 10 Multilayer molded
Claims (3)
一次成形部材の基材に開口部を予め形成し、二次成形材料の注入時に前記開口部を当該二次成形材料のガス逃げ部として作用させたことを特徴とする多層成形方法。 A multilayer molding method in which a secondary molding material is injected into a surface portion of a primary molding member and multilayer molding is performed,
A multilayer molding method, wherein an opening is formed in advance in a base material of a primary molding member, and the opening acts as a gas escape portion of the secondary molding material when the secondary molding material is injected.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103448198A (en) * | 2013-08-21 | 2013-12-18 | Tcl王牌电器(惠州)有限公司 | Transparent plastic part manufacturing method and transparent plastic part manufacturing system |
| JP2014064276A (en) * | 2012-09-21 | 2014-04-10 | Lg Electronics Inc | Mobile terminal |
| WO2017030093A1 (en) * | 2015-08-20 | 2017-02-23 | 京セラ株式会社 | Electronic device and method for manufacturing same |
-
2009
- 2009-11-16 JP JP2009261119A patent/JP2011104839A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014064276A (en) * | 2012-09-21 | 2014-04-10 | Lg Electronics Inc | Mobile terminal |
| US9066430B2 (en) | 2012-09-21 | 2015-06-23 | Lg Electronics Inc. | Mobile terminal with sealing structure |
| CN103448198A (en) * | 2013-08-21 | 2013-12-18 | Tcl王牌电器(惠州)有限公司 | Transparent plastic part manufacturing method and transparent plastic part manufacturing system |
| WO2017030093A1 (en) * | 2015-08-20 | 2017-02-23 | 京セラ株式会社 | Electronic device and method for manufacturing same |
| JP2017039277A (en) * | 2015-08-20 | 2017-02-23 | 京セラ株式会社 | Electronic equipment and production method thereof |
| US20180229410A1 (en) * | 2015-08-20 | 2018-08-16 | Kyocera Corporation | Electronic device and method of manufacturing the same |
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