JPS61244514A - Manufacture of foamed molded article - Google Patents
Manufacture of foamed molded articleInfo
- Publication number
- JPS61244514A JPS61244514A JP60087187A JP8718785A JPS61244514A JP S61244514 A JPS61244514 A JP S61244514A JP 60087187 A JP60087187 A JP 60087187A JP 8718785 A JP8718785 A JP 8718785A JP S61244514 A JPS61244514 A JP S61244514A
- Authority
- JP
- Japan
- Prior art keywords
- weld line
- protrusion
- resin
- molded article
- molten resin
- 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)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、発泡成形品の製造方法に係り、特にガスカウ
ンタープレッシャー法において、ウェルドラインのない
外観上優れた成形品が得られる製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a foam molded product, and in particular to a method for producing a molded product with no weld lines and excellent appearance in the gas counter pressure method. .
（従来の技術）
発泡射出成形は大きな型締力を必要としないことから、
近年盛んに実施されている。(Conventional technology) Since foam injection molding does not require large mold clamping force,
It has been actively implemented in recent years.
このような削出成形方法のひとつとして、いわゆるガス
カウンタープレッシャー法（以下ｒＧ、Ｃ，Ｐ法」とい
う。）が知られている。A so-called gas counter pressure method (hereinafter referred to as rG, C, P method) is known as one of such cutting molding methods.
このＧ、Ｃ，Ｐ法とは、樹脂の射出に際し、あらしめ不
活性ガス等により、金型のキャビティー内を加圧してお
き、該加圧状態下で樹脂を躬出し、その後発泡成形する
方法であり、キャビティー内が加圧されているために、
射出充填中、樹脂の発泡が抑えられるので、表面が均一
に高密度で成形され、表面が平滑で美Ｈな成形品が得ら
れやずいという利点を有Ｊ−る。The G, C, P method involves pressurizing the inside of the mold cavity with a storm inert gas, etc. when injecting the resin, squeezing out the resin under the pressurized state, and then foaming it. method, and because the inside of the cavity is pressurized,
Since foaming of the resin is suppressed during injection and filling, the surface is molded uniformly and with high density, and it has the advantage that it is easy to obtain a molded product with a smooth surface and beautiful appearance.
（発明が解決しようとする問題点）
上記Ｇ、Ｃ，Ｐ法では、まず金型を閉じて、キャビティ
ー内にガスの注入が開始され、ついで、キャビティー内
に加圧状態下で溶融樹脂が充填される。はぼ充填された
あと、ガス抜きを行ない次の発泡工程に移ることとなる
。(Problems to be Solved by the Invention) In the above G, C, and P methods, the mold is first closed, gas is started to be injected into the cavity, and then molten resin is poured into the cavity under pressure. is filled. After the foam is completely filled, the gas is degassed and the next foaming process begins.
このようイｔＧ、ｃ、Ｐ法においては、溶融樹脂の射出
時、第２図のキャビティー内の概略図に示すように、グ
ー１〜部６から注入された樹脂の流動速度がキャビティ
ー内の内圧のために阻害されやすく、樹脂の合流点につ
丁ルドライン△が形成されやすい。ウェルドラインによ
っては、第３図の断面図にボブように凹部７が形成され
、顕著な場合指の爪が引く掛ることもあり、外観や物性
上、不都合である。In the tG, c, and P methods, when the molten resin is injected, the flow rate of the resin injected from the goo parts 1 to 6 increases within the cavity, as shown in the schematic diagram of the inside of the cavity in Figure 2. It is easy to be inhibited due to the internal pressure of the resin, and a blind line Δ is likely to be formed at the confluence of the resins. Depending on the weld line, a recess 7 is formed like a bob in the cross-sectional view of FIG. 3, and in severe cases, a fingernail may get caught, which is inconvenient in terms of appearance and physical properties.
（問題点を解決するための手段）
本発明は、上記問題点を解消できる成形方法を見出した
ものであって、その要旨とするところは、
金型のキャビティー内にガスを注入し、加圧状態下に溶
融樹脂を射出するガスカウンタープレッシャー法による
発泡成形品の！８１造方法におイテ、グー１〜部（６）
から射出注入された溶融樹脂が合流して形成するウェル
ドラインＡ、及びＡの周辺部に対応］ノだ金型の内側部
分に凸部（１〉を説けて射出成形し、この部分に未発泡
の並肉部（３）を形成することを特徴どする発泡成形品
の製造方法にある。(Means for Solving the Problems) The present invention has discovered a molding method that can solve the above problems, and its gist is that gas is injected into the cavity of a mold and Foam molded products made using the gas counter pressure method, in which molten resin is injected under pressure! 81 I like the manufacturing method, goo part 1~ (6)
[Corresponding to the weld line A formed by the convergence of the molten resin injected from the mold and the surrounding area of A] A convex part (1) is formed on the inside part of the mold and injection molded, and this part is unfoamed. The present invention provides a method for producing a foamed molded product, which comprises forming a medium-thickness portion (3) of a foam molded product.
以下、本発明の実施例を図面により詳細に説明する。Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明方法により（ｑられた成形品及び成形用
金型の一部断面図、第２図はキャビティー内の概略図、
第３図は従来品のウェルドライン周辺断面図である。Fig. 1 is a partial sectional view of a molded product and a molding die produced by the method of the present invention, Fig. 2 is a schematic diagram of the inside of the cavity,
FIG. 3 is a sectional view around the weld line of a conventional product.
本発明にＪ５いては、Ｍ造される発泡成形品の形状にｊ
：って、生じるウェル１−ラインＡの位置を確認し、そ
の位置に対応する金型の内側部分に第１図に示すような
凸部４を設ける必要がある。この凸部については、特に
形状は限定されないが、樹脂流動の流速を変更する抵抗
を４１：しる高さを有づるものであり、ウェルドライン
八と同一方向の一定の幅を有するもので、最終成形品の
強度等を考慮して決める必要がある。In the present invention, J5 has J5 in the shape of the foam molded product to be made M
:It is necessary to confirm the position of the generated well 1-line A and provide a convex portion 4 as shown in FIG. 1 on the inner side of the mold corresponding to that position. The shape of this convex part is not particularly limited, but it should have a height of 41:1 to provide a resistance that changes the flow rate of the resin flow, and a constant width in the same direction as the weld line 8. It is necessary to decide by considering the strength of the final molded product.
この凸部を嵌込み式にづるど種々の成形品形状に対応で
きるので好ましい。上記の凸部を設けることにより、こ
の部分のキャごティー内の断面積が減少することによっ
て、樹脂流動が速くなり、樹脂圧力が高まるために、樹
脂の発泡が抑えられ、結果として、ウェルドラインの発
生を防止できるものである。This is preferable because the convex portion can be fitted into various molded product shapes. By providing the above-mentioned convex part, the cross-sectional area inside the cage of this part is reduced, the resin flow becomes faster, the resin pressure increases, and the foaming of the resin is suppressed.As a result, the weld line It is possible to prevent the occurrence of
イ５お、凸部を設（プる位置は、成形品の内表面側にな
る金型に設けるのが外観上不都合がなく好ましい。(5) It is preferable to provide the convex portion on the mold that will be on the inner surface of the molded product since this will not cause any inconvenience in terms of appearance.
（発 明 の 効 果）
上述したように、本発明の方法によれば、ウェルドライ
ンのない外観上優れた、ガスカウンタープレッシャー法
による発泡成形品が容易に得られるという利点を有する
。(Effects of the Invention) As described above, the method of the present invention has the advantage that a foam molded product with no weld lines and excellent appearance can be easily obtained by the gas counter pressure method.
第１図は本発明方法により得られた成形品及び成形用金
型の一部断面図、第２図はキャビティー内の概略図、第
３図は従来品のウェルドライン周辺断面図である。
Ａ・・・・・・ウェルドライン
３・・・・・・薄肉部 ４・・・・・・凸部６・・
・・・・ゲート部
特許出願人 三菱樹脂株式会ネ１ 他１名先３ 図FIG. 1 is a partial sectional view of a molded product and a molding die obtained by the method of the present invention, FIG. 2 is a schematic view of the inside of the cavity, and FIG. 3 is a sectional view of the weld line area of a conventional product. A: Weld line 3: Thin wall portion 4: Convex portion 6:
...gate patent applicant Mitsubishi Plastics Co., Ltd. 1 and 1 other person 3 Figure
Claims (1)
融樹脂を射出するガスカウンタープレッシャー法による
発泡成形品の製造方法において、ゲート部（６）から射
出注入された溶融樹脂が合流して形成するウエルドライ
ンＡ、及びＡの周辺部に対応した金型の内側部分に凸部
（４）を設けて射出成形し、この部分に未発泡の薄肉部
（３）を形成することを特徴とする発泡成形品の製造方
法。In a method for producing foam molded products using the gas counter pressure method, in which gas is injected into the cavity of a mold and molten resin is injected under pressurized conditions, the molten resin injected from the gate part (6) joins together. A convex part (4) is provided on the inner part of the mold corresponding to the weld line A and the peripheral part of A, and injection molding is performed, and an unfoamed thin part (3) is formed in this part. A method for manufacturing a foam molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60087187A JPS61244514A (en) | 1985-04-23 | 1985-04-23 | Manufacture of foamed molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60087187A JPS61244514A (en) | 1985-04-23 | 1985-04-23 | Manufacture of foamed molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61244514A true JPS61244514A (en) | 1986-10-30 |
| JPH0453169B2 JPH0453169B2 (en) | 1992-08-25 |
Family
ID=13907981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60087187A Granted JPS61244514A (en) | 1985-04-23 | 1985-04-23 | Manufacture of foamed molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61244514A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01253432A (en) * | 1988-03-31 | 1989-10-09 | Yamarura Glass Co Ltd | Injection molded piece and manufacture thereof |
| JPH01261985A (en) * | 1988-04-13 | 1989-10-18 | Toshiba Corp | Color image pickup device |
| CN1081120C (en) * | 1997-10-24 | 2002-03-20 | 三星电子株式会社 | Gas injected molding machine |
| JP2009190357A (en) * | 2008-02-18 | 2009-08-27 | Daikyonishikawa Corp | Panel with outer skin made of foam resin, and its molding method |
| JP2010162823A (en) * | 2009-01-19 | 2010-07-29 | Mazda Motor Corp | Method and apparatus for molding foamed resin molded product |
| JP2010264646A (en) * | 2009-05-14 | 2010-11-25 | Mazda Motor Corp | Method and apparatus for molding foam resin molded article |
| JP2014064276A (en) * | 2012-09-21 | 2014-04-10 | Lg Electronics Inc | Mobile terminal |
-
1985
- 1985-04-23 JP JP60087187A patent/JPS61244514A/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01253432A (en) * | 1988-03-31 | 1989-10-09 | Yamarura Glass Co Ltd | Injection molded piece and manufacture thereof |
| JPH01261985A (en) * | 1988-04-13 | 1989-10-18 | Toshiba Corp | Color image pickup device |
| CN1081120C (en) * | 1997-10-24 | 2002-03-20 | 三星电子株式会社 | Gas injected molding machine |
| JP2009190357A (en) * | 2008-02-18 | 2009-08-27 | Daikyonishikawa Corp | Panel with outer skin made of foam resin, and its molding method |
| JP2010162823A (en) * | 2009-01-19 | 2010-07-29 | Mazda Motor Corp | Method and apparatus for molding foamed resin molded product |
| US8337186B2 (en) | 2009-01-19 | 2012-12-25 | Mazda Motor Corporation | Method and apparatus for molding resin foam product |
| EP2208598A3 (en) * | 2009-01-19 | 2017-11-22 | Mazda Motor Corporation | Method and apparatus for molding resin foam product |
| JP2010264646A (en) * | 2009-05-14 | 2010-11-25 | Mazda Motor Corp | Method and apparatus for molding foam resin molded article |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0453169B2 (en) | 1992-08-25 |
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