JPH0651316B2 - Sandwich molding method - Google Patents
Sandwich molding methodInfo
- Publication number
- JPH0651316B2 JPH0651316B2 JP22358089A JP22358089A JPH0651316B2 JP H0651316 B2 JPH0651316 B2 JP H0651316B2 JP 22358089 A JP22358089 A JP 22358089A JP 22358089 A JP22358089 A JP 22358089A JP H0651316 B2 JPH0651316 B2 JP H0651316B2
- Authority
- JP
- Japan
- Prior art keywords
- layer material
- skin layer
- main body
- hard
- soft
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，自動車用マッドガードのごとく本体から分岐
した硬質部分と軟質部分とを有するサンドイッチ成形品
を成形する方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for molding a sandwich molded article having a hard portion and a soft portion branched from a main body such as an automobile mudguard.
合成樹脂のサンドイッチ成形方法としては，例えば特公
昭５２−１１３３６号公報に示される技術がある。A synthetic resin sandwich molding method is disclosed in, for example, Japanese Patent Publication No. 52-11336.
上記公報掲載の技術は，射出ノズルで成形型のキャビテ
ィ内に，まず非多泡状の表皮材料を射出し，更に推進剤
（発泡剤）で多泡状になる内核材料を射出して，非多泡
状の表皮材料と多泡状の内核材料からなるサンドイッチ
合成樹脂成形品を製造する方法である。In the technology disclosed in the above publication, first, a non-foamed skin material is injected into a cavity of a molding die by an injection nozzle, and then a propellant (foaming agent) is used to inject a foamed inner core material. This is a method for producing a sandwich synthetic resin molded article composed of a foam-like skin material and a foam-like inner core material.
この方法を利用すれば，内部に硬いコア層を有し，その
表面に軟らかい表皮層を被覆したサンドイッチ成形品を
製造することができる。By using this method, it is possible to manufacture a sandwich molded article having a hard core layer inside and coating a soft skin layer on the surface thereof.
ところで，或る種の成形品においては，一部分はサンド
イッチ構造として硬質部分にするが，他の部分はサンド
イッチ構造とせず上記表皮層の材料のみによる軟質部分
としたい場合がある。By the way, in a certain type of molded article, it is sometimes desired to make one part a hard part having a sandwich structure but not make another part a sandwich structure but a soft part made of only the material of the skin layer.
例えば，第８図に示すごとく，自動車の車輪後方に取り
付けるマッドガード９（実施例の第６図参照）は，本体
９１とその下方に設けた下片９２と，両者の間より分岐
した取付部９３とからなる。ここに，本体９１と取付部
９３とは，取付孔９１，９３１及びボルト（図示省略）
により，車体に固定する部分である。一方，下片９２
は，垂下して泥よけを行う部分である。そして，該下片
９２は，この部分が駐車場の区画ブロック等に当接した
とき，容易に弾性的に変形するよう構成しておく必要が
ある。For example, as shown in FIG. 8, a mudguard 9 attached to the rear of a vehicle wheel (see FIG. 6 of the embodiment) includes a main body 91, a lower piece 92 provided below the main body 91, and a mounting portion 93 branched between the two. Consists of. Here, the main body 91 and the mounting portion 93 are the mounting holes 91 and 931 and the bolt (not shown).
Is the part that is fixed to the vehicle body. On the other hand, the lower piece 92
Is the part that hangs down to prevent mud. The lower piece 92 needs to be configured to be easily elastically deformed when this portion comes into contact with a partition block or the like of a parking lot.
そのため，マッドガード９は，本体９１と取付部９３と
は比較的硬い部分となし，一方下片９２は比較的軟質と
しておくことが望まれている。Therefore, in the mudguard 9, it is desired that the main body 91 and the mounting portion 93 are relatively hard parts, while the lower piece 92 is relatively soft.
しかしながら，前記従来のサンドイッチ成形方法によれ
ば，前記第８図に示すごとく，本体９１と取付部９３と
は表皮層７の中にコア層８が包まれている硬質部分を形
成させることができるが，一方下片９２においてもコア
層８が内包されて硬質部分を形成してしまう。そのた
め，下片９２を比較的軟質とすることができない。However, according to the conventional sandwich molding method, as shown in FIG. 8, the main body 91 and the mounting portion 93 can form a hard portion in which the core layer 8 is enclosed in the skin layer 7. However, the core layer 8 is also included in the lower piece 92 to form a hard portion. Therefore, the lower piece 92 cannot be made relatively soft.
即ち，従来のサンドイッチ成形方法においては，上記の
ごとく本体から分岐した硬質部分と軟質部分とを有する
サンドイッチ成形品を得ることは困難である。That is, with the conventional sandwich molding method, it is difficult to obtain a sandwich molded product having a hard portion and a soft portion branched from the main body as described above.
本発明は，かかる従来の問題点に鑑み，サンドイッチ成
形方法について種々の検討を重ねた結果なされたもの
で，本体から分岐している一方の部分はサンドイッチ構
造の硬質部分を有し，他方の部分は表皮層と同材質のみ
で構成した軟質部分を有するサンドイッチ成形品を製造
することができる，成形方法を提供しようとするもので
ある。In view of such conventional problems, the present invention has been made as a result of various studies on a sandwich molding method. One part branched from a main body has a hard part having a sandwich structure, and the other part is Aims to provide a molding method capable of producing a sandwich molded article having a soft portion composed only of the same material as the skin layer.
本発明は，本体と，該本体から分岐した硬質部分及び軟
質部分とを有し，上記本体と硬質部分とは硬いコア層と
該コア層の表面に被覆した軟らかい表皮層とからなるサ
ンドイッチ構造を有し，一方上記軟質部分は上記表皮層
と同材料により構成された，合成樹脂のサンドイッチ成
形品を成形するに当たり，成形品の形状を有するキャビ
ティ内において，本体形成部から硬質部分形成部と軟質
部分形成部とが分岐する近傍において，上記硬質部分形
成部に表皮層材料の流入を抑制する流動抵抗部を設けた
成形型を用い，上記キャビティ内に本体形成部を経由し
て表皮層材料を射出し，その後該表皮層材料内にコア層
材料を注入することを特徴とするサンドイッチ成形品の
成形方法にある。The present invention has a sandwich structure having a main body, a hard portion and a soft portion branched from the main body, and the main body and the hard portion have a hard core layer and a soft skin layer coated on the surface of the core layer. On the other hand, when molding a synthetic resin sandwich molded product composed of the same material as the skin layer, the soft part has a soft part from the main body forming part to the soft part forming part in the cavity having the shape of the molded product. In the vicinity of the branch with the partial forming part, a molding die having a flow resistance part for suppressing the inflow of the skin layer material in the hard part forming part is used, and the skin layer material is introduced into the cavity through the main part forming part. A method for forming a sandwich molded article is characterized by injecting and then injecting a core layer material into the skin layer material.
本発明において，最も注目すべきことは，成形型のキャ
ビティ内において，硬質部分形成部に上記流動抵抗部を
設けたことにある。What is most noticeable in the present invention is that the flow resistance portion is provided in the hard portion forming portion in the cavity of the molding die.
上記流動抵抗部は，本体形成部から硬質部分形成部が分
岐した後方において，該硬質部分形成部内の入口付近に
設けることが好ましい。該流動抵抗部は，上記硬質部分
形成部の内方へ突出した状態で設ける（第１図参照）。
また，該流動抵抗部は，成形型内壁に固定して設けるこ
と（第１図参照）の外，可動式とすることもできる（第
７図参照）。更に，該流動抵抗部は，本体から流入して
きた表皮層材料が，硬質部分形成部よりもまず軟質部分
形成部に，流入するよう設ける。より具体的には，例え
ば軟質部分形成部が表皮層材料によって占められた後
に，表皮層材料が該流動抵抗部を越えて，硬質部分形成
部に入り始めるようにする。It is preferable that the flow resistance portion is provided in the vicinity of the inlet in the hard portion forming portion, behind the main portion forming portion and the hard portion forming portion. The flow resistance portion is provided so as to project inward of the hard portion forming portion (see FIG. 1).
Further, the flow resistance portion may be movable (see FIG. 7) in addition to being fixedly provided on the inner wall of the molding die (see FIG. 1). Further, the flow resistance portion is provided so that the skin layer material flowing from the main body first flows into the soft portion forming portion rather than the hard portion forming portion. More specifically, for example, after the soft portion forming portion is occupied by the skin layer material, the skin layer material begins to cross the flow resistance portion and enter the hard portion forming portion.
また，本発明において，本体形成部とはコア層材料と表
皮層材料とを注入するためのゲートを設けてある部分の
ことをいう。それ故，成形品における本体は，硬質部分
と同様に，コア層と表皮層とからなるサンドイッチ構造
を形成している。Further, in the present invention, the main body forming portion means a portion provided with a gate for injecting the core layer material and the skin layer material. Therefore, the main body of the molded product forms a sandwich structure including a core layer and a skin layer, like the hard portion.
本発明においは，まずゲートより本体形成部内に表皮層
材料を射出していく。射出された表皮層材料は本体形成
部内を充填しながら前方に押されていき，硬質部分形成
部と軟質部分形成部との分岐点に達する。そして，更に
続く表皮層材料の射出により，表皮層材料は硬質部分形
成部と軟質部分形成部の両方に入ろうとするが，硬質部
分形成部には前記流動抵抗部があるため，表皮層材料は
まず軟質部分形成部に入る。In the present invention, first, the skin layer material is injected from the gate into the main body forming portion. The injected skin layer material is pushed forward while filling the inside of the main body forming portion, and reaches the branch point between the hard portion forming portion and the soft portion forming portion. Then, by further injection of the skin layer material, the skin layer material tries to enter both the hard portion forming portion and the soft portion forming portion, but since the hard portion forming portion has the flow resistance portion, the skin layer material is First, enter the soft part forming part.
そして，表皮層材料は，軟質部分全容量と本体及び硬質
部分の表皮層容量分との合計量が成形型のキャビティ内
に射出される。このとき，表皮層材料は，例えば軟質部
分形成部内に７０％位充填されているが，一方硬質部分
形成部内は上記流動抵抗部の抵抗があるため殆ど入って
いない。Then, the skin layer material is injected into the cavity of the molding die in a total amount of the total volume of the soft portion and the skin layer volume of the main body and the hard portion. At this time, the skin layer material, for example, is filled in the soft portion forming portion by about 70%, while the hard portion forming portion hardly contains the flow resistance portion because of the resistance of the flow resistance portion.
その後，本体形成部内の表皮層材料内にコア層材料を射
出する。このコア層材料の射出により，前記表皮層材料
は更に前方に進み，まず軟質部分形成部内は表皮層材料
によって完全充填される。その後，残りの表皮層材料が
前記流動抵抗部を越えて硬質部分形成部内に流入してい
く。After that, the core layer material is injected into the skin layer material in the main body forming portion. By the injection of the core layer material, the skin layer material further advances forward, and first, the inside of the soft portion forming portion is completely filled with the skin layer material. After that, the remaining skin layer material flows over the flow resistance portion and flows into the hard portion forming portion.
また，本体形成部分の表皮層材料内を進んできたコア層
材料は，軟質部分形成部が既に軟質樹脂で充填されてい
るので，この中には入れず，該コア層材料は前記流動抵
抗部を越えて硬質部分形成部内の表皮層材料内に入り込
み，前方に進む。Further, the core layer material that has advanced inside the skin layer material of the main body forming portion is not filled in the soft portion forming portion because it is already filled with the soft resin, and the core layer material is not included in the flow resistance portion. Crosses over and enters the skin layer material in the hard part forming part, and advances forward.
したがって，本発明によれば，本体及び硬質部分はコア
層材料を表皮層材料で被覆したサンドイッチ構造を呈
し，軟質部分は表皮層材料のみによって構成された，サ
ンドイッチ成形品を製造することができる。Therefore, according to the present invention, it is possible to manufacture a sandwich molded article in which the main body and the hard portion have a sandwich structure in which the core layer material is covered with the skin layer material, and the soft portion is constituted by only the skin layer material.
第１実施例 本発明の実施例にかかるサンドイッチ成形品の成形方法
につき，第１図〜第６図を用いて説明する。First Embodiment A molding method of a sandwich molded product according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
本例において製造しようとするサンドイッチ成形品は，
第５図及び第６図に示す自動車用マッドガード４であ
る。該マッドガード４は第６図に示すごとく，車体に取
付ける本体４１及び取付部４３と，これらの下方に垂設
した下片４２とよりなる。The sandwich molded product to be manufactured in this example is
The mudguard 4 for an automobile shown in FIGS. 5 and 6. As shown in FIG. 6, the mudguard 4 is composed of a main body 41 and a mounting portion 43 to be mounted on the vehicle body, and a lower piece 42 vertically provided below these.
上記本体４１は，ボルト挿入用の取付孔４１１，４１２
を，また取付部４３は同様の取付孔４３１を有する。ま
た，上記本体４１と取付部４３との間には，両者で囲ま
れた凹所４５を有する。該凹所４５は，車体の一部を挿
入する部分である。更に，上記取付部４３下方において
は，下片４２との分岐点近くに凹状溝４３５が形成され
ている。該凹状溝４３５は，後述する成形型１の流動抵
抗部１０５によって形成された部分である。The body 41 has mounting holes 411, 412 for inserting bolts.
And the mounting portion 43 has a similar mounting hole 431. Further, between the main body 41 and the mounting portion 43, there is a recess 45 surrounded by both. The recess 45 is a portion into which a part of the vehicle body is inserted. Further, below the mounting portion 43, a concave groove 435 is formed near the branch point with the lower piece 42. The concave groove 435 is a portion formed by the flow resistance portion 105 of the molding die 1 described later.
また，上記マッドガード４の断面構造は，第５図に示す
ごとく，本体４１と取付部４３とは表皮層材料２の中に
コア層材料３が内包されているサンドイッチ構造の硬質
部分を形成し，下片４２は表皮層材料２のみからなる軟
質部分を形成している。つまり，本体４１と取付部４３
とは硬いコア層を内包しているので硬質部分となり，下
片４２は軟らかい表皮層材料のみからなるので軟質部分
となる。As shown in FIG. 5, the cross-sectional structure of the mudguard 4 is such that the main body 41 and the mounting portion 43 form a hard portion of a sandwich structure in which the core layer material 3 is included in the skin layer material 2, The lower piece 42 forms a soft portion made of only the skin layer material 2. That is, the main body 41 and the mounting portion 43
Is a hard part because it contains a hard core layer, and the lower piece 42 is a soft part because it is made of only a soft skin layer material.
次に，上記マッドガード４の成形方法につき説明する。Next, a method of forming the mudguard 4 will be described.
まず，この成形方法に用いる成形型１は，第１図に示す
ごとく，分割型１１〜１３からなる。そして，これら分
割型によって囲まれた部分が，マッドガード成形用のキ
ャビティ１０を構成する。該キャビティ１０は，本体形
成部１０１，下片形成部１０２，取付部形成部１０３よ
りなる。そして，分割型１３は，上記取付部形成部１０
３の入口部近傍に突出した流動抵抗部１０５を有する。First, the molding die 1 used in this molding method is composed of split molds 11 to 13, as shown in FIG. The portion surrounded by these split molds constitutes a cavity 10 for mudguard molding. The cavity 10 includes a main body forming portion 101, a lower piece forming portion 102, and a mounting portion forming portion 103. Then, the split mold 13 includes the mounting portion forming portion 10 described above.
3 has a flow resistance portion 105 protruding near the inlet portion.
また分割型１１は，本体形成部１０１に開口するゲート
１８を有する。該ゲート１８は，表皮層材料注入用の射
出成形機，及びコア層材料注入用の射出成形機（図示
略）に連結している。Further, the split mold 11 has a gate 18 opening to the main body forming portion 101. The gate 18 is connected to an injection molding machine for injecting a skin layer material and an injection molding machine (not shown) for injecting a core layer material.
次に，射出成形方法につき第２図〜第４図を用いて説明
する。Next, the injection molding method will be described with reference to FIGS.
まず，最初は，第２図に示すごとく，本体形成部１０１
内に，ゲート１８より表皮層材料２を射出する。この表
皮層材料２の射出量は，前記下片４２の全容積と，本体
４１及び取付部４３の表皮層の容量に相当する。First, first, as shown in FIG. 2, the main body forming portion 101
The skin layer material 2 is injected into the inside through the gate 18. The injection amount of the skin layer material 2 corresponds to the total volume of the lower piece 42 and the volume of the skin layer of the main body 41 and the mounting portion 43.
しかして，この射出時においては，表皮層材料２は本体
形成部１０１内を前方へ押されていく。このとき，キャ
ビティー壁に接触した部分の表皮層材料２は，固化し表
皮層を形成する。そして，表皮層材料２の先端が取付部
形成部１０３と下片１０２との分岐点に達したとき，取
付部形成部１０３側には流動抵抗部１０５があるため，
表皮層材料２は流動抵抗の少ない下片形成部１０２側に
流入していく。そして，取付部形成部１０３側には入ら
ない。Then, at the time of this injection, the skin layer material 2 is pushed forward in the main body forming portion 101. At this time, the skin layer material 2 in the portion in contact with the cavity wall is solidified to form a skin layer. When the tip of the skin layer material 2 reaches the branch point between the mounting portion forming portion 103 and the lower piece 102, there is the flow resistance portion 105 on the mounting portion forming portion 103 side.
The skin layer material 2 flows into the lower piece forming portion 102 side, which has less flow resistance. And, it does not enter the mounting portion forming portion 103 side.
そして，上記のごとく表皮材料２の射出後は，第３図に
示すごとく，本体形成部１０１の表皮層材料２内にゲー
ト１８よりコア層材料３を射出していく。この射出によ
り，前記表皮層材料２は更に前方に押され，表皮層材料
２は先ず流動抵抗の少ない下片形成部１０２内を充填す
る。そして，更に続くコア層材料３の射出により，下片
形成部１０２内に入り切れなった表皮層材料２は前記流
動抵抗部１０５を越えて取付部形成部１０３内に押し込
まれていく。After the injection of the skin material 2 as described above, the core layer material 3 is injected from the gate 18 into the skin layer material 2 of the main body forming portion 101 as shown in FIG. By this injection, the skin layer material 2 is pushed further forward, and the skin layer material 2 first fills the inside of the lower piece forming portion 102 having low flow resistance. Then, by further injection of the core layer material 3, the skin layer material 2 that has not completely entered the lower piece formation portion 102 is pushed into the attachment portion formation portion 103 beyond the flow resistance portion 105.
そして，更に，続くコア層材料３の射出により，コア層
材料３は下片形成部１０２の入口部分に達するが，下片
形成部１０２内は既に表皮層材料２によって充填されて
いる。そのため，第４図に示すごとく，コア層材料３も
流動抵抗部１０５を越えて取付部形成部１０３内に入り
表皮層材料２内を前進していく。そして，取付部形成部
１０３内は表皮層材料２とその内部のコア層材料３によ
って充填される。Then, by further injection of the core layer material 3, the core layer material 3 reaches the inlet portion of the lower piece forming portion 102, but the inside of the lower piece forming portion 102 is already filled with the skin layer material 2. Therefore, as shown in FIG. 4, the core layer material 3 also enters the attachment portion forming portion 103 beyond the flow resistance portion 105 and advances in the skin layer material 2. Then, the inside of the attachment portion forming portion 103 is filled with the skin layer material 2 and the core layer material 3 therein.
その後は，全体を冷却，固化させ，成形型１より成形品
を取り出す。該成形品は，前記第５図，第６図に示した
マッドガード４である。また，該マッドガード４の取付
部４３の内側下方には，下片４２との分岐点近くに，前
記成形型１の流動抵抗部１０５によって形成された凹状
溝４３５を有している。After that, the whole is cooled and solidified, and the molded product is taken out from the molding die 1. The molded product is the mudguard 4 shown in FIGS. 5 and 6. Further, a concave groove 435 formed by the flow resistance portion 105 of the molding die 1 is provided below the inside of the attachment portion 43 of the mudguard 4 and near the branch point with the lower piece 42.
上記のごとく，本例の成形方法によれば，本体４１及び
取付部４３はコア層材料３を表皮層材料２で被覆したサ
ンドイッチ構造を有し，下片４２は表皮層材料２のみに
よって構成された，マッドガード４を容易に製造するこ
とができる。As described above, according to the molding method of this example, the main body 41 and the mounting portion 43 have a sandwich structure in which the core layer material 3 is covered with the skin layer material 2, and the lower piece 42 is composed of only the skin layer material 2. Moreover, the mudguard 4 can be easily manufactured.
第２実施例 本例は，第７図に示すごとく，第１実施例における固定
式流動抵抗部１０５に代えて，可動式流動抵抗部５を用
いたものである。その他は第１実施例と同様である。Second Embodiment As shown in FIG. 7, this embodiment uses a movable flow resistance portion 5 instead of the fixed flow resistance portion 105 in the first embodiment. Others are the same as those in the first embodiment.
上記流動抵抗部５は，可動せき部５１と，これを進退さ
せる油圧シリンダ５３と，両者を連結するロッド５２と
よりなる。上記可動せき部５１は，成形型１の一部に設
けたガイド穴１００内に配設する。The flow resistance portion 5 includes a movable dam 51, a hydraulic cylinder 53 that advances and retracts the movable dam 51, and a rod 52 that connects the both. The movable dam portion 51 is arranged in a guide hole 100 provided in a part of the molding die 1.
しかして，本例においては，上記シリンダ５３により可
動せき部５１を前後方向に進退させることにより，流動
抵抗部における樹脂流通路１０９の厚さを変えることが
できる。Therefore, in this example, the thickness of the resin flow passage 109 in the flow resistance portion can be changed by moving the movable weir portion 51 forward and backward by the cylinder 53.
本例によれば，第１実施例と同様の効果を得ることがで
きる他，射出材料の種類等の条件に応じて流動抵抗部の
条件を変えることができ，所望するサンドイッチ成形品
を得ることが一層容易となる。According to this example, the same effects as those of the first example can be obtained, and the conditions of the flow resistance portion can be changed according to the conditions such as the type of injection material, and a desired sandwich molded product can be obtained. Will be even easier.
第１図〜第６図は第１実施例の方法を示し，第１図は成
形型の断面図，第２図〜第４図はサンドイッチ成形にお
ける樹脂流れの説明図，第５図は第６図のＡ−Ａ線矢視
断面図，第６図はマッドガードの斜視図，第７図は第２
実施例における流動抵抗部近傍の断面図，第８図は従来
のマッドガードの断面図である。 １……成形型， １０……キャビティ， １０１……本体形成部， １０２……下片形成部， １０２……取付部形成部， ２……表皮層材料， ３……コア層材料， １０５，５……流動抵抗部， ４，９……マッドガード， ４１……本体， ４２……下片， ４３……取付部， ５１……可動せき部，1 to 6 show the method of the first embodiment, FIG. 1 is a sectional view of a molding die, FIGS. 2 to 4 are explanatory views of resin flow in sandwich molding, and FIG. FIG. 6 is a perspective view of the mudguard, and FIG. 7 is a second sectional view taken along the line AA of FIG.
FIG. 8 is a sectional view in the vicinity of the flow resistance portion in the embodiment, and FIG. 8 is a sectional view of a conventional mudguard. 1 ... Mold, 10 ... Cavity, 101 ... Main body forming part, 102 ... Lower piece forming part, 102 ... Mounting part forming part, 2 ... Skin layer material, 3 ... Core layer material, 105, 5 ... Flow resistance part, 4, 9 ... Mudguard, 41 ... Main body, 42 ... Lower piece, 43 ... Mounting part, 51 ... Movable weir part,
Claims (1)
軟質部分とを有し，上記本体と硬質部分とは硬いコア層
と該コア層の表面に被覆した軟らかい表皮層とからなる
サンドイッチ構造を有し，一方上記軟質部分は上記表皮
層と同材料により構成された，合成樹脂のサンドイッチ
成形品を成形するに当たり， 成形品の形状を有するキャビティ内において，本体形成
部から硬質部分形成部と軟質部分形成部とが分岐する近
傍において，上記硬質部分形成部に表皮層材料の流入を
抑制する流動抵抗部を設けた成形型を用い， 上記キャビティ内に本体形成部を経由して表皮層材料を
射出し，その後表皮層材料内にコア層材料を注入するこ
とを特徴とするサンドイッチ成形品の成形方法。1. A sandwich structure having a main body and a hard portion and a soft portion branched from the main body, wherein the main body and the hard portion have a hard core layer and a soft skin layer coated on the surface of the core layer. On the other hand, when molding a synthetic resin sandwich molded product composed of the same material as the skin layer, the soft part is formed from the main body forming part to the hard part forming part in the cavity having the shape of the molded product. In the vicinity of the branch with the soft part forming part, a mold having a flow resistance part for suppressing the inflow of the skin layer material in the hard part forming part is used, and the skin layer material is passed through the main part forming part in the cavity. A method for forming a sandwich molded article, which comprises injecting a core material and then injecting a core layer material into the skin layer material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22358089A JPH0651316B2 (en) | 1989-08-30 | 1989-08-30 | Sandwich molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22358089A JPH0651316B2 (en) | 1989-08-30 | 1989-08-30 | Sandwich molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0386509A JPH0386509A (en) | 1991-04-11 |
| JPH0651316B2 true JPH0651316B2 (en) | 1994-07-06 |
Family
ID=16800396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22358089A Expired - Fee Related JPH0651316B2 (en) | 1989-08-30 | 1989-08-30 | Sandwich molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0651316B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04353414A (en) * | 1991-05-31 | 1992-12-08 | Toyoda Gosei Co Ltd | Resin molded item by sandwich molding method |
| CN103144681B (en) * | 2013-03-15 | 2015-07-15 | 东风(十堰)非金属部件有限公司 | Automobile fender and fabrication method |
-
1989
- 1989-08-30 JP JP22358089A patent/JPH0651316B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0386509A (en) | 1991-04-11 |
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