JP3230103B2 - Sandwich molded products - Google Patents
Sandwich molded productsInfo
- Publication number
- JP3230103B2 JP3230103B2 JP13627292A JP13627292A JP3230103B2 JP 3230103 B2 JP3230103 B2 JP 3230103B2 JP 13627292 A JP13627292 A JP 13627292A JP 13627292 A JP13627292 A JP 13627292A JP 3230103 B2 JP3230103 B2 JP 3230103B2
- Authority
- JP
- Japan
- Prior art keywords
- core layer
- molded product
- frame
- resin
- core
- 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
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は，ウエルドの発生がな
く，剛性に優れた，サンドイッチ成形品に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandwich molded article having no rigidity and excellent rigidity.
【０００２】[0002]
【従来技術】サンドイッチ成形品は，各種プラスチック
成形品において，スキン層とその中に形成されたコア層
とよりなる。上記サンドイッチ成形品としては，例えば
図５に示すごとく，枠状体成形品９がある。該枠状体成
形品９は，スキン層９１とコア層９２とよりなる。そし
て，該枠状成形品９はタブ形成部分９０において，コア
層９２が左右両側方向からタブ形成部分９０内に流出し
ている。2. Description of the Related Art A sandwich molded product comprises a skin layer and a core layer formed therein in various plastic molded products. As the sandwich molded product, for example, there is a frame-shaped molded product 9 as shown in FIG. The frame-shaped molded product 9 includes a skin layer 91 and a core layer 92. In the frame-shaped molded article 9, the core layer 92 flows out of the tab forming portion 90 into the tab forming portion 90 from both left and right sides.
【０００３】また，上記タブ形成部分９０は，その入口
近傍の小流路９０１において，コア層９２の不連続部分
９２０が形成されている。この不連続部分９２０は，ス
キン層９１が上記小流路９０１に沿って左右両側方向の
コア層９２を遮断している。また，上方には，ゲート跡
部分９９を有する。In the tab forming portion 90, a discontinuous portion 920 of the core layer 92 is formed in a small flow path 901 near the entrance. In the discontinuous portion 920, the skin layer 91 blocks the core layer 92 in both left and right directions along the small flow path 901. Further, a gate trace portion 99 is provided above.
【０００４】上記スキン層９１は，例えばポリプロピレ
ンにエチレンプロピレンジェンラバー（ＥＰＤＭ）をブ
レンドした樹脂，エチレン・ビニル・アセテート樹脂，
スチレン・エチレン・ブタジエン・スチレン（ＳＥＢ
Ｓ）樹脂，スチレン・ブタジエン・スチレン（ＳＢＳ）
樹脂，軟質塩化ビニル（ＰＶＣ）樹脂などがある。The skin layer 91 is made of, for example, a resin obtained by blending ethylene propylene rubber (EPDM) with polypropylene, ethylene vinyl acetate resin,
Styrene, ethylene, butadiene, styrene (SEB
S) Resin, styrene-butadiene-styrene (SBS)
Resin and soft vinyl chloride (PVC) resin.
【０００５】上記コア層９２は硬質系材料よりなり，例
えばアクリル・スチレン（ＡＳ）樹脂，アクリロ・ニト
リル・スチレン（ＡＢＳ）樹脂，硬質ＰＶＣ樹脂，タル
ク等の各種強化材入りのポリプロピレン（ＰＰ）樹脂，
ＡＢＳ樹脂などがある。The core layer 92 is made of a hard material such as an acrylic styrene (AS) resin, an acrylonitrile styrene (ABS) resin, a hard PVC resin, or a polypropylene (PP) resin containing various reinforcing materials such as talc. ,
ABS resin and the like.
【０００６】[0006]
【解決しようとする課題】しかしながら，上記従来技術
には，次の問題点がある。即ち，上記サンドイッチ成形
品としての枠状体成形品９は，タブ形成部分９０の近く
において，コア層９２の不連続部分９２０を有する。か
かる不連続部分９２０は，スキン層９１のみからなるた
め，剛性に優れない。その理由は，上記コア層９２の不
連続部分９２０は，左右両側方向に芯材としてのコア層
９２が形成されておらず，この部分の剛性が不足するか
らである。However, the above prior art has the following problems. That is, the frame-shaped molded product 9 as the sandwich molded product has the discontinuous portion 920 of the core layer 92 near the tab forming portion 90. Since the discontinuous portion 920 is composed of only the skin layer 91, it has poor rigidity. The reason is that the discontinuous portion 920 of the core layer 92 is not formed with the core layer 92 as a core material in the left and right sides, and the rigidity of this portion is insufficient.
【０００７】その結果，大きな荷重が加わると，該不連
続部分９２０は破損し易い。また，該不連続部分９２０
には，ウエルド（図示略）が発生し易い。ここで，ウエ
ルドとは，分流していた樹脂材料が合流した部分に発生
する，溶融樹脂の合流ラインムラ（スジ）である。As a result, when a large load is applied, the discontinuous portion 920 is easily broken. In addition, the discontinuous portion 920
, A weld (not shown) is likely to occur. Here, the weld is a joining line unevenness (streak) of the molten resin generated at a portion where the separated resin materials join.
【０００８】そのため，上記不連続部分９２０は見栄え
が良くない。また，かかるウエルドに起因して，クラッ
クが生じ易い。本発明は，かかる従来の問題点に鑑みて
なされたもので，ウエルドの発生がなく，剛性に優れ
た，サンドイッチ成形品を提供しようとするものであ
る。Therefore, the discontinuous portion 920 does not look good. In addition, cracks tend to occur due to the weld. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a sandwich molded product having no rigidity and excellent rigidity.
【０００９】[0009]
【課題の解決手段】本発明は，スキン層とその中に形成
されたコア層とよりなるサンドイッチ成形品であって，
上記コア層は左右両側方向から流入されており，かつ上
記両コア層はタブへの流出先の近傍において互いに重複
した複層形成部を有することを特徴とするサンドイッチ
成形品にある。The present invention relates to a sandwich molded article comprising a skin layer and a core layer formed therein,
The sandwich molded article is characterized in that the core layer flows in from both left and right sides, and the two core layers have a multilayer forming portion overlapping each other in the vicinity of an outflow destination to the tab.
【００１０】上記両コア層の複層形成部を形成するに当
たっては，例えば，サンドイッチ成形品を成形するため
の成形型にタブ形成部分を複数形成する。そして，この
複数のタブ形成部分を設けた成形型のキャビティー内に
おいて，左右両方向から流れてくるコア層が，スキン層
を挟んで互いにクロスして流れるように流れてくるガイ
ドを設ける。このような，ガイドとしては，中子，セ
キ，ジャマ板などがある（図４参照）。In forming the multilayer forming portion of the two core layers, for example, a plurality of tab forming portions are formed in a molding die for molding a sandwich molded product. Then, a guide is provided in the cavity of the mold having the plurality of tab forming portions so that the core layers flowing from both the left and right directions cross each other across the skin layer. As such a guide, there are a core, a seki, a jam plate and the like (see FIG. 4).
【００１１】これにより，コア層はタブ形成部分におい
て，左右両側方向から略均等に流出し，両コア層はタブ
への流出先の近傍で互いに重複した複層形成部を形成す
る。上記サンドイッチ成形品としては，例えば枠状体成
形品がある。該枠状体成形品は，例えばラジエータグリ
ルを作製するに当り，フレーム部分を格子部に対して応
用することができる。As a result, the core layer flows out of the tab forming portion substantially uniformly from both the left and right sides, and the two core layers form a multilayer forming portion overlapping each other in the vicinity of the outlet to the tab. Examples of the sandwich molded product include a frame-shaped molded product. For example, the frame portion can be applied to a lattice portion in manufacturing a radiator grill of the frame-shaped body molded product.
【００１２】[0012]
【作用及び効果】本発明のサンドイッチ成形品において
は，コア層は左右両側方向から流入して，タブへの流出
先の近傍において互いに重複した複層形成部を形成して
いる。その結果，上記複層形成部の部分においては，ス
キン層中に二重構造状のコア層が形成された状態にな
る。そのため，かかる部分は剛性に優れる。In the sandwich-molded article of the present invention, the core layer flows in from both left and right sides and forms a multi-layered portion overlapping each other in the vicinity of the outlet to the tub. As a result, in the portion where the multilayer is formed, a core layer having a double structure is formed in the skin layer. Therefore, such a portion is excellent in rigidity.
【００１３】また，上記複層形成部のタブ形成部分を形
成するに当たっては，例えば複数のタブを有する成形型
を用いる。そのため，該タブがエアベント（ガス逃げ
穴）の役割を果たす。これにより，成形型内の溶融樹脂
中の空気の逃げが良くなり，ウエルドの発生がなくな
る。それ故，本発明によれば，ウエルドの発生がなく，
剛性に優れた，サンドイッチ成形品を提供することがで
きる。In forming the tab forming portion of the multilayer forming portion, for example, a mold having a plurality of tabs is used. Therefore, the tab functions as an air vent (gas escape hole). Thereby, the escape of the air in the molten resin in the molding die is improved, and the occurrence of weld is eliminated. Therefore, according to the present invention, no weld is generated,
A sandwich molded article having excellent rigidity can be provided.
【００１４】[0014]
【実施例】本発明の実施例にかかるサンドイッチ成形品
につき，図１〜図４を用いて説明する。本例において得
ようとするサンドイッチ成形品は，自動車用ラジエータ
グリルの外枠である。この外枠の中に格子部が設けられ
る。図１〜図３に示すごとく，本例のサンドイッチ成形
品は，スキン層１１とその中に形成されたコア層１２と
よりなる枠状体成形品１である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sandwich molded product according to an embodiment of the present invention will be described with reference to FIGS. The sandwich molded product to be obtained in this example is the outer frame of the radiator grill for an automobile. A lattice portion is provided in the outer frame. As shown in FIGS. 1 to 3, the sandwich molded product of the present embodiment is a frame-shaped molded product 1 including a skin layer 11 and a core layer 12 formed therein.
【００１５】コア層１２は，図１，図４に示すごとく，
左右両側方向から流入されており，かつ両コア層１２，
１２はタブへの流出先近傍１１１において，互いに重複
した複層形成部１２１を有する。また，枠状体成形品１
は，複層形成部１２１の両端部にタブ形成部分１３１，
１３２をそれぞれ有する。上記複層形成部１２１は，図
２に示すごとく，中央部にスキン層凹部１１０を有す
る。そして，該スキン層凹部１１０の上下部には，両コ
ア層１２，１２が二重構造状に形成されている。The core layer 12 is formed as shown in FIGS.
Inflow from both left and right sides, and both core layers 12,
Numeral 12 has a multilayer forming portion 121 overlapping with each other in the vicinity 111 of the outflow destination to the tub. In addition, the frame-shaped article 1
Are tab-forming portions 131 at both ends of the multi-layer forming portion 121,
132. As shown in FIG. 2, the multilayer forming portion 121 has a skin layer concave portion 110 at the center. Both core layers 12, 12 are formed in a double structure at the upper and lower portions of the skin layer recess 110.
【００１６】上記流出先近傍１１１より左方の下部１１
５においては，図３に示すごとく，下方部のみにコア層
１２が形成されている。一方，右方の下部１１６におい
ては，これと逆に上方部分にのみコア層１２が形成され
ている。また，上方には，ゲート跡部分１９を有する。
次に，上記枠状体成形品１を成形するに当たっては，図
４に示すごとく，両側にそれぞれタブ２１，２２を有す
る成形型２を用いる。The lower portion 11 on the left side of the outflow destination vicinity 111
5, the core layer 12 is formed only on the lower part as shown in FIG. On the other hand, in the lower part 116 on the right, the core layer 12 is formed only in the upper part. Further, a gate trace portion 19 is provided above.
Next, in molding the frame-shaped molded article 1, as shown in FIG. 4, a molding die 2 having tabs 21 and 22 on both sides is used.
【００１７】成形型２は，キャビティーの両タブ２１，
２２の間において，コア層ガイド用の斜状のセキ２３を
有する。また，上記両タブ２１，２２は，小流路２１
１，２２１を有する。また，上記キャビティー２０は，
枠状体成形品１の外形状に相応した形状を有する。ま
た，成形型２は，上方にゲート２４を有する。The molding die 2 comprises two tabs 21 of the cavity,
Between 22, there is an oblique cut 23 for guiding the core layer. Further, the two tabs 21 and 22 are connected to the small flow path 21.
1,221. Also, the cavity 20
It has a shape corresponding to the outer shape of the frame-shaped article 1. The mold 2 has a gate 24 above.
【００１８】枠状体成形品１を成形するに当たっては，
図４に示すごとく，まずゲート２４より，キャビティー
２０内にスキン層１１を形成するためのＡＢＳ樹脂３１
を射出する。その後，該ＡＢＳ樹脂３１内にコア層１２
を形成するためのガラス繊維入りＰＰ樹脂３２を注入す
る。ＰＰ樹脂３２は，矢印で示すごとく，左右方向より
キャビティー２０内を充填しつつ，上記コア層ガイド２
３用のセキに達する。そして，該セキ２３によりガイド
されて，左右の各方向からのＰＰ樹脂３２は該セキ２３
を挟んで互いにクロスして２方向へ流れる。これによ
り，図１に示した枠状体成形品１が得られる。In molding the frame-shaped molded article 1,
As shown in FIG. 4, first, an ABS resin 31 for forming the skin layer 11 in the cavity 20 is formed from the gate 24.
Inject Then, the core layer 12 is placed in the ABS resin 31.
Is injected with a glass fiber-containing PP resin 32 for forming the resin. The PP resin 32 fills the inside of the cavity 20 from the left and right directions as shown by the arrow, and
We reach Seki for three. Then, the PP resin 32 from each of the left and right directions is guided by the
Flow in two directions crossing each other. Thereby, the frame-shaped molded article 1 shown in FIG. 1 is obtained.
【００１９】本例の枠状成形品１は，上記複層形成部１
２１において，スキン層１１中に二重構造状のコア層１
２が形成されている。そのため，かかる部分は，剛性に
優れることになる。なお，上記タブ形成部分１３１，１
３２は，成形型２より取出した後に切断除去される。ま
た，上記タブ２１，２２がエアベントの役割を果たす。
これにより，成形型２内の溶融樹脂中の空気の逃げが良
くなり，ウエルドを発生することがなくなる。The frame-shaped molded article 1 of the present embodiment has a
21, the core layer 1 having a double structure is provided in the skin layer 11.
2 are formed. Therefore, such a portion has excellent rigidity. The tab forming portions 131, 1
32 is cut and removed after being removed from the mold 2. Further, the tabs 21 and 22 function as air vents.
Thereby, the escape of the air in the molten resin in the mold 2 is improved, and no weld is generated.
【００２０】それ故，本例によれば，ウエルドの発生が
なく，剛性に優れた複層形成部１２１を有する枠状体成
形品１を得ることができる。また，上記成形型２内に
は，コア層ガイド用のセキ２３が形成してあるため，コ
ア層１２の複層形成部１２１の形成が容易である。Therefore, according to the present embodiment, it is possible to obtain the frame-shaped article 1 having the multilayer forming portion 121 having no rigidity and excellent rigidity. In addition, since the core layer guide groove 23 is formed in the mold 2, it is easy to form the multilayer forming portion 121 of the core layer 12.
【００２１】なお，本例においては，上記タブ２１，２
２間に，コア層ガイド用のセキ２３を設けた成形型２を
用いる例を示したが，このセキ２３に代えて，コア層ガ
イド用の中子とすることもできる。また，上記枠状成形
品１はその内側に形成すべく格子部と一体的に成形する
こともできる。In this embodiment, the tabs 21 and 21 are used.
Although an example is shown in which the molding die 2 provided with the core layer guide key 23 between the two is used, a core for core layer guide may be used instead of the key 23. Further, the frame-shaped molded product 1 can be integrally formed with the lattice portion so as to be formed inside the frame-shaped molded product 1.
【図１】実施例にかかるサンドイッチ成形品としての枠
状体成形品の断面図。FIG. 1 is a cross-sectional view of a frame-shaped molded product as a sandwich molded product according to an example.
【図２】図１のＡ−Ａ線矢視断面図。FIG. 2 is a sectional view taken along line AA of FIG. 1;
【図３】図１のＢ−Ｂ線矢視断面図。FIG. 3 is a sectional view taken along line BB of FIG. 1;
【図４】実施例における，成形型を示す平面図。FIG. 4 is a plan view showing a molding die in the embodiment.
【図５】従来のサンドイッチ成形品としての枠状体成形
品の断面図。FIG. 5 is a cross-sectional view of a frame-shaped molded product as a conventional sandwich molded product.
１．．．枠状体成形品， １１．．．スキン層， １２．．．コア層， １２１．．．複層形成部， １３１，１３２．．．タブ形成部分， ２．．．成形型， ２０．．．キャビティー， ２１，２２．．．タブ， 1. . . 10. frame-shaped article; . . 11. skin layer; . . Core layer, 121. . . Multi-layer forming part, 131, 132. . . Tab forming part; . . Mold, 20. . . Cavities, 21, 22,. . . tab,
Claims (1)
よりなるサンドイッチ成形品であって，上記コア層は左
右両側方向から流入されており，かつ上記両コア層はタ
ブへの流出先の近傍において互いに重複した複層形成部
を有することを特徴とするサンドイッチ成形品。1. A sandwich molded product comprising a skin layer and a core layer formed therein, wherein said core layer flows in from both left and right sides, and said core layers are flowed out to a tab. Characterized by having a multilayer forming part overlapping each other in the vicinity of the sandwich.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13627292A JP3230103B2 (en) | 1992-04-29 | 1992-04-29 | Sandwich molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13627292A JP3230103B2 (en) | 1992-04-29 | 1992-04-29 | Sandwich molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05305632A JPH05305632A (en) | 1993-11-19 |
| JP3230103B2 true JP3230103B2 (en) | 2001-11-19 |
Family
ID=15171319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13627292A Expired - Fee Related JP3230103B2 (en) | 1992-04-29 | 1992-04-29 | Sandwich molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3230103B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6792215B1 (en) | 1999-09-30 | 2004-09-14 | Anritsu Corporation | Multiwavelength light source device employing annular optical delay circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4936498B2 (en) * | 2004-01-27 | 2012-05-23 | 株式会社明治ゴム化成 | Molding method for plastic molded products |
| EP2060380B1 (en) * | 2007-11-13 | 2013-05-15 | Gealan Formteile GmbH | Multiple layer flow line |
-
1992
- 1992-04-29 JP JP13627292A patent/JP3230103B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6792215B1 (en) | 1999-09-30 | 2004-09-14 | Anritsu Corporation | Multiwavelength light source device employing annular optical delay circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05305632A (en) | 1993-11-19 |
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