JPH08323817A - Mold for injection molding synthetic resin product and injection molding method using the mold - Google Patents
Mold for injection molding synthetic resin product and injection molding method using the moldInfo
- Publication number
- JPH08323817A JPH08323817A JP7135395A JP13539595A JPH08323817A JP H08323817 A JPH08323817 A JP H08323817A JP 7135395 A JP7135395 A JP 7135395A JP 13539595 A JP13539595 A JP 13539595A JP H08323817 A JPH08323817 A JP H08323817A
- Authority
- JP
- Japan
- Prior art keywords
- runner
- mold
- product
- injection molding
- 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.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims description 22
- 229920003002 synthetic resin Polymers 0.000 title claims description 10
- 239000000057 synthetic resin Substances 0.000 title claims description 10
- 229920005989 resin Polymers 0.000 claims abstract description 68
- 239000011347 resin Substances 0.000 claims abstract description 68
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 238000000465 moulding Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2703—Means for controlling the runner flow, e.g. runner switches, adjustable runners or gates
-
- 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
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C2045/0041—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks preventing initial material from entering the mould cavity
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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、外観部品として好適な
製品を成形するための合成樹脂製品の射出成用金型及び
その金型を使用した射出成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for injection molding synthetic resin products for molding products suitable as external parts, and an injection molding method using the mold.
【０００２】[0002]
【従来の技術】射出成形品には、ジェッティング現象に
より製品ゲート部付近にフローマークが表出しやすく、
外観部品ではその対策に頭を痛めている。フローマーク
は、溶融樹脂が製品ゲート部を通過する際に発生するメ
ルトフラクチャが原因であるから、射出速度を下げて製
品ゲート部を通過する樹脂の流速を遅くすれば、発生を
抑えることができる。 しかし射出速度を遅くすると、
射出中に固化が始まってしまうため、キャビティ内への
射出が不充分になって、新たに、湯じわ、あばた、欠肉
等の発生を招いてしまう。そこで従来は、成形機の操作
により、溶融樹脂が製品ゲート部を通過するまでは低速
で射出し、その後は高速に切り変えてキャビティ内に溶
融樹脂を充填するといった多段射出成形法の導入が試み
られている。2. Description of the Related Art In injection molded products, due to the jetting phenomenon, flow marks are likely to appear near the product gate,
For external parts, we are hurt by the measures. Since the flow mark is caused by the melt fracture that occurs when the molten resin passes through the product gate, it can be suppressed by lowering the injection speed and slowing the flow velocity of the resin passing through the product gate. . However, if you slow down the injection speed,
Since the solidification starts during the injection, the injection into the cavity becomes insufficient, which causes new generation of wrinkles, pockmarks, lack of wall, and the like. Therefore, in the past, an attempt was made to introduce a multi-stage injection molding method in which the molten resin was injected at a low speed by operating the molding machine until it passed the product gate, and then switched to a high speed to fill the cavity with the molten resin. Has been.
【０００３】[0003]
【発明が解決しようとする課題】多段射出成形法の導入
は、フローマークの発生低減に極めて効果的である。し
かし、射出速度の切り変えタイミングの設定がむずかし
いこと、射出速度を極端に遅くした場合、成形サイクル
が長くなってしまうこと、製品ゲート部の大型化を招
き、ゲートシールが長くなるばかりか、ゲートカットが
困難となる等の難点が生じ、その改善が望まれている。The introduction of the multi-stage injection molding method is extremely effective in reducing the generation of flow marks. However, it is difficult to set the injection speed switching timing, if the injection speed is extremely slowed, the molding cycle becomes long, the product gate becomes large, and not only the gate seal becomes longer, but also the gate seal becomes longer. Problems such as difficulty in cutting occur, and improvement thereof is desired.
【０００４】[0004]
【課題を解決するための手段】本発明は、前記従来の欠
点解消を目的とした合成樹脂製品成形技術であって、そ
の構成は、製品ゲート部を介して製品キャビティに連通
したランナーの適宜部位に、ダミーゲート部を介して微
小ボリュームの樹脂溜りを分岐形成するか、製品ゲート
部を介して製品キャビティに連通したランナーの適宜部
位に、サブランナーを接続した合成樹脂製品の射出成用
金型と、それらいずれかの射出成用金型を使用し、ラン
ナーに接続されたスプルーより、溶融樹脂を実質的に一
定の射出速度で注入する射出成形方法とにある。そして
前記射出成形用金型においては、ダミーゲート部を複数
設け、それらを介して同数又はそれより少数の樹脂溜り
を設けたり、サブランナーをランナーより小さい断面積
とし、ランナーから延設させたり、サブランナーをラン
ナーより薄肉とし、ランナーに沿設させることができ
る。ダミーゲート部を設ける場合において、その断面積
は、製品ゲート部の断面積と同じか、それより幾分大き
くするのが好ましく、又その数は、金型設計、樹脂のロ
ス等を考慮して許容される範囲内において、多い方が効
果は大きい。DISCLOSURE OF THE INVENTION The present invention is a synthetic resin product molding technique intended to solve the above-mentioned conventional drawbacks, the structure of which is an appropriate portion of a runner communicating with a product cavity through a product gate. In addition, a resin mold of minute volume is branched and formed through a dummy gate part, or a sub-runner is connected to an appropriate part of a runner that communicates with a product cavity through a product gate part, for injection molding of synthetic resin products. And an injection molding method in which a molten resin is injected at a substantially constant injection speed from a sprue connected to a runner using any one of the injection molding dies. And in the injection molding die, a plurality of dummy gate portions are provided, the same number or a smaller number of resin reservoirs are provided through them, or the sub-runner has a cross-sectional area smaller than the runner and is extended from the runner, The sub-runner can be made thinner than the runner and can be installed along the runner. When providing the dummy gate part, it is preferable that the cross-sectional area is the same as or slightly larger than the cross-sectional area of the product gate part, and the number thereof should be determined in consideration of the mold design, resin loss, etc. The more the amount is within the allowable range, the greater the effect.
【０００５】[0005]
【作用】樹脂溜りを設けた金型にあっては、スプルーよ
り注入された溶融樹脂は、最初、製品ゲート部を介して
製品キャビティ内に射出導入が開始されると同時に、ダ
ミーゲート部を介して樹脂溜り内にも射出され、それに
よって製品ゲート部を通過する樹脂の速度は低下する。
樹脂溜り内に溶融樹脂が充満した後は、製品キャビティ
内へのみの射出に切り変わり、高速で射出充填される。
又サブランナーを設けた金型にあっては、スプルーより
注入された溶融樹脂は、最初、製品ゲート部を介してキ
ャビティ内に射出導入が開始されると同時に、サブラン
ナーにも流れ、それによって製品ゲート部を通過する樹
脂の速度が低下され、サブランナー内に樹脂が充満した
後は、前記樹脂溜りを設けた金型と同様に、製品キャビ
ティ内のみの射出に切り変わって高速で射出充填され
る。よってそのような金型を使用し、スプルーから溶融
樹脂を基本的には一定の射出速度で注入するだけで、多
段射出成形と同じ効果が得られ、ダミーゲート部やサブ
ランナーを複数設けることにより、製品ゲート部を通過
する樹脂の速度低下率を高めることができるし、ランナ
ーにサブランナーを延設、沿設する構造とすれば、金型
の形成が容易となる。In the mold provided with the resin reservoir, the molten resin injected from the sprue is first injected into the product cavity through the product gate portion, and at the same time, is injected through the dummy gate portion. Are also injected into the resin pool, which reduces the speed of the resin passing through the product gate.
After the molten resin is filled in the resin pool, the injection is switched to injection into the product cavity only, and injection filling is performed at high speed.
In the case of a mold equipped with a sub-runner, the molten resin injected from the sprue first starts to be injected and introduced into the cavity through the product gate, and at the same time flows into the sub-runner, which After the speed of the resin passing through the product gate is reduced and the sub-runner is filled with resin, the injection is switched to injection only in the product cavity and high-speed injection filling is performed, just like the mold with the resin reservoir. To be done. Therefore, by using such a mold and injecting molten resin from the sprue at a basically constant injection speed, the same effect as multi-stage injection molding can be obtained, and by providing multiple dummy gate parts and sub-runners The rate of decrease in the speed of the resin passing through the product gate can be increased, and if the sub-runner is extended and installed along the runner, the mold can be easily formed.
【０００６】[0006]
【実施例】本発明に係る合成樹脂製品の射出成用金型及
びその金型を使用した射出成形方法を図面に基づいて説
明する。図１は射出成形用の金型を示したもので、この
金型１は、スプルー２に連通したランナー３を備え、そ
のランナー３には、製品ゲート部４を介して製品キャビ
ティ５が形成されていると共に、そのランナー３を挟ん
だ前記製品キャビティ５の対称位置に、製品ゲート部４
と同じ断面積のダミーゲート部６を介して微小ボリュー
ムの樹脂溜り７が三箇所に分岐形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An injection mold for a synthetic resin product according to the present invention and an injection molding method using the mold will be described with reference to the drawings. FIG. 1 shows a mold for injection molding. The mold 1 includes a runner 3 communicating with a sprue 2, and a product cavity 5 is formed in the runner 3 via a product gate portion 4. In addition, at the symmetrical position of the product cavity 5 sandwiching the runner 3, the product gate portion 4 is provided.
A resin reservoir 7 of a minute volume is branched and formed at three locations via a dummy gate portion 6 having the same cross-sectional area as.
【０００７】このように形成された金型１は、スプルー
２より溶融樹脂を注入すると、その溶融樹脂はランナー
３に沿って流れ、先ず製品ゲート部４及びダミーゲート
部６を介して夫々製品キャビティ５と樹脂溜り７の中に
射出される（図２のａ）。製品キャビティ５への射出口
である製品ゲート部４と樹脂溜り７への射出口であるダ
ミーゲート部６とは同じ面積であるから、各ゲート部
４，６を通る樹脂の量も等しく、製品ゲート部４を通過
する溶融樹脂の量は、スプルー２から注入された樹脂を
四等分した量に匹敵し、製品ゲート部４における速度
は、ダミーゲート部と樹脂溜りを有しない場合の四分の
一となる。よって、最初は製品ゲート部４を通過する溶
融樹脂の速度は、本来の四分の一に減速される。樹脂溜
り７内に溶融樹脂が行き渡って、樹脂溜７り内が溶融樹
脂で満たされれば、ダミーゲート部６からの射出は停止
し、スプルー２から注入された溶融樹脂の総てが製品ゲ
ート部４を介してキャビティ５内に射出されるようにな
り（図２のｂ）、その速度は最初の四倍となる。このよ
うにスプルーより一定の射出速度で注入したにも拘ら
ず、製品ゲート部を通過する溶融樹脂の速度は二段階に
変化する。製品ゲート部における射出の時間は、樹脂溜
り内に溶融樹脂がいっぱいに充填されるまでの時間に相
当するから、スプルーからの注入速度が一定であれば、
樹脂溜りの容積やダミーゲート部の断面積等によって自
と決まり、製品ゲート部での速度は、スプルーからの注
入速度が一定であれば、ダミーゲート部の断面積、及び
その数等によって調整することができる。When the molten resin is injected from the sprue 2 in the mold 1 thus formed, the molten resin flows along the runner 3 and firstly through the product gate portion 4 and the dummy gate portion 6, respectively, the product cavity. 5 and the resin reservoir 7 are injected (a in FIG. 2). Since the product gate portion 4 which is the injection port to the product cavity 5 and the dummy gate portion 6 which is the injection port to the resin reservoir 7 have the same area, the amount of resin passing through each of the gate portions 4 and 6 is the same. The amount of the molten resin passing through the gate part 4 is equal to the amount of the resin injected from the sprue 2 which is divided into four equal parts, and the speed at the product gate part 4 is equal to the quarter when the dummy gate part and the resin reservoir are not provided. Will be one. Therefore, initially, the speed of the molten resin passing through the product gate portion 4 is reduced to one fourth of the original speed. When the molten resin spreads in the resin reservoir 7 and the resin reservoir 7 is filled with the molten resin, the injection from the dummy gate portion 6 is stopped, and all of the molten resin injected from the sprue 2 is in the product gate portion. It will be injected into the cavity 5 via 4 (b of FIG. 2), and its velocity will be four times as much as the first. As described above, the speed of the molten resin passing through the product gate portion changes in two steps, even though the sprue is injected at a constant injection speed. Since the injection time at the product gate part corresponds to the time until the molten resin is fully filled in the resin pool, if the injection speed from the sprue is constant,
It is determined by the volume of the resin pool and the cross-sectional area of the dummy gate, etc., and the speed at the product gate is adjusted by the cross-sectional area of the dummy gate and the number if the injection speed from the sprue is constant. be able to.
【０００８】この金型を使用すれば、多段射出機能を有
しない装置でも、正確な切り変えタイミングによる多段
射出が可能となる。前記実施例は樹脂溜りに射出される
樹脂により製品ゲート部の流速を低くしているが、図３
のａに例示するように、ランナー３の閉塞先端部等に、
それより細く先端が閉塞されたサブランナー８を延設
し、最初はそのサブランナー８へも樹脂を流すようにし
て製品ゲート部４の通過速度をコントロールしたり、図
３のｂの如く、ランナー３に絞り部９を設け、その絞り
部９より先端側にあたるランナー３の一部を樹脂溜りと
して利用する等、樹脂の逃げ場所の形態を変更して差し
支えない。 又、図４のａの如く、ランナー３に沿って
そのランナー３より薄肉のサブランナーとしての拡張部
１０を形成したり、図４のｂの如く、サブランナー８の
断面積をランナー３と等しく、或はランナーより大きく
し、ヘジテーション効果の利用によって、最初流動抵抗
の少ないサブランナー８に大半の溶融樹脂を流す一方、
その間、溶融樹脂の一部を極端に遅い速度で製品ゲート
部４を通過させて製品キャビティ５内に射出させるよう
にもできるし、図４のｃの如く、容積の異なる樹脂溜り
７ａ，７ｂ，７ｃや、図示はしないが、サブランナーを
複数設け、文字通り多段射出させるよう構成することも
できる。更には、図５のａの如く、互いに連通された樹
脂溜り７ｄとしたり、図５のｂの如く，樹脂溜り７の分
岐形成位置を製品キャビティ５から遠避けたり、分散さ
せるなど、樹脂溜りやサブランナーの数、形状、位置等
は、各種パターンを含み、これらいずれの場合も、切り
変えタイミングは正確で、金型毎に、フローマークの表
出が最小となる条件に設定される。By using this mold, it becomes possible to perform multi-stage injection with accurate switching timing even in a device that does not have the multi-stage injection function. In the above-mentioned embodiment, the resin injected into the resin reservoir reduces the flow velocity at the product gate portion.
As illustrated in a of FIG.
A sub-runner 8 with a narrower tip is extended to control the passage speed of the product gate section 4 by flowing the resin to the sub-runner 8 at the beginning, or as shown in FIG. 3 may be provided with a narrowed portion 9 and a part of the runner 3 located on the tip side of the narrowed portion 9 may be used as a resin reservoir to change the form of the escape area of the resin. Further, as shown in FIG. 4A, an expanded portion 10 as a sub-runner that is thinner than the runner 3 is formed along the runner 3, and as shown in FIG. 4B, the cross-sectional area of the sub-runner 8 is equal to that of the runner 3. Or, by making the size larger than the runner and utilizing the hesitation effect, most of the molten resin is made to flow to the sub-runner 8 which initially has a low flow resistance,
In the meantime, a part of the molten resin can be made to pass through the product gate portion 4 at an extremely slow speed and be injected into the product cavity 5, and as shown in FIG. 4c, resin pools 7a, 7b having different volumes, 7c or, although not shown, a plurality of sub-runners may be provided to literally perform multi-stage injection. Further, as shown in FIG. 5A, the resin pool 7 d communicates with each other. As shown in FIG. 5B, the resin pool 7 is formed by avoiding or dispersing the branch formation position of the resin pool 7 from the product cavity 5. The number, shape, position, etc. of the sub-runners include various patterns, and in any of these cases, the switching timing is accurate, and the conditions are set such that the flow mark is minimized for each mold.
【０００９】このように、金型の改造によって多段射出
が可能となり、その結果フローマークは大幅に減少す
る。次に、ランナー形状のパターンの違いにより、実際
の製品における外観の仕上がり評価の結果を例示する。
この表に示される数値は、製品の外観状態を目視観察に
より相対評価したもので、数値が大きいほど外観が良好
である。尚表に示された金型形状において、製品ゲート
部はランナーより薄肉になっている。又、実施例１及び
２におけるサブランナーは、前記ランナーと同一断面積
であり、実施例３及び４におけるサブランナーは、前記
ランナーと同一断面積の領域を経て、それより小断面積
の領域が連設されている。金型形状は、いずれの実施例
も、サブランナー部に斜線を施すことにより区別してあ
る。As described above, multistage injection is possible by modifying the die, and as a result, flow marks are greatly reduced. Next, the result of the finish evaluation of the appearance of the actual product due to the difference in the pattern of the runner shape will be illustrated.
The numerical values shown in this table are relative evaluations of the external appearance of the product by visual observation. The larger the numerical value, the better the external appearance. In the die shape shown in the table, the product gate is thinner than the runner. In addition, the sub-runners in Examples 1 and 2 have the same cross-sectional area as the runner, and the sub-runners in Examples 3 and 4 go through a region having the same cross-sectional area as the runner and a region having a smaller cross-sectional area than that. It is lined up. The mold shapes are distinguished by hatching the sub-runner portion in all the examples.
【００１０】[0010]
【表１】 [Table 1]
【００１１】更に、別の実施例として、ダミーゲート部
を介して樹脂溜りを設けた場合の結果を表２に示す。Further, as another embodiment, Table 2 shows the result when the resin reservoir is provided through the dummy gate portion.
【表２】 [Table 2]
【００１２】以上の結果から、樹脂溜りやサブランナー
に相当する溶融樹脂の逃げ場所を設け、多段成形を可能
とした金型は、溶融樹脂の逃げ場所を設けない金型に比
べて外観形状の評価は高い傾向にあることを認識できる
が、溶融樹脂の射出速度や、ランナー及びサブランナー
の形態、数等の違いにより外観の評価は異なり、サブラ
ンナー１つをとってもフローマークとの関係において一
定した法則があるわけではなく、ダミーゲート部の場合
においても、樹脂溜りや製品キャビティの形状の相違に
よってケースバイケースの結果が予想されるため、いち
がいにどれが良いかは断定することはできないが、製品
形状に応じ、その都度、最適な樹脂溜りやサブランナー
を設計すれば、高結果が期待される。From the above results, a mold capable of performing multi-stage molding by providing a molten resin escape place corresponding to a resin reservoir or a sub-runner has a better appearance shape than a mold having no molten resin escape place. It can be recognized that the evaluation tends to be high, but the appearance evaluation differs depending on the injection speed of the molten resin, the form and number of runners and sub-runners, etc., and even one sub-runner has a constant relationship with the flow mark. There is no such rule, and even in the case of the dummy gate part, the result of case by case is expected due to the difference in the shape of the resin pool and the product cavity, so it is not possible to determine which is better at all, If you design the optimum resin pool and sub-runner each time according to the product shape, you can expect high results.
【００１３】尚、実施例は一個取りの金型を説明した
が、複数個取りの金型にも適用され、樹脂溜りとして、
表面形状が問題とされない製品形成用のキャビティに利
用し、樹脂の無駄をなくすようにもできる。In addition, although the embodiment explained the one-die mold, it can also be applied to a plurality of dies, and as a resin reservoir,
It can also be used as a cavity for product formation where the surface shape is not a problem, and it is possible to eliminate resin waste.
【００１４】[0014]
【発明の効果】本発明の金型によれば、射出速度の変更
機能を有しない装置でも、多段射出成形が可能となり、
その切り変えタイミングは正確にコントロールされる
し、最初に製品ゲート部を通過する樹脂の速度を抑える
ことで、フローマークは減少する。そしてこの金型は、
既成の金型を部分的に変更することで対応できるし、製
品ゲート部を大型化しなくても、製品ゲート部における
低速度での射出が可能となる。又この金型を使した成形
方法によれば、射出速度を極端に遅くする必要がないた
め、成形サイクルが長くならず、製品ゲート部における
樹脂の流速を切り換えるタイミングは正確無比である。According to the mold of the present invention, it is possible to perform multi-stage injection molding even with an apparatus having no function of changing the injection speed.
The switching timing is accurately controlled, and the flow mark is reduced by suppressing the speed of the resin passing through the product gate first. And this mold is
This can be achieved by partially changing the existing mold, and it is possible to inject at a low speed in the product gate without increasing the size of the product gate. Further, according to the molding method using this mold, since it is not necessary to extremely slow down the injection speed, the molding cycle does not become long, and the timing of switching the flow rate of the resin at the product gate portion is accurate and unrivaled.
【図１】 本発明に係る金型の実施例を示す説明図であ
る。FIG. 1 is an explanatory view showing an embodiment of a mold according to the present invention.
【図２】 二段射出成形工程の説明図である。FIG. 2 is an explanatory diagram of a two-step injection molding process.
【図３】 ａ，ｂは金型の変更実施例を示す説明図であ
る。FIG. 3A and FIG. 3B are explanatory views showing a modified embodiment of a mold.
【図４】 ａ，ｂ，ｃは金型の変更実施例を示す説明図
である。4A, 4B, and 4C are explanatory views showing a modified example of a mold.
【図５】 ａ，ｂは金型の変更実施例を示す説明図であ
る。5A and 5B are explanatory views showing a modified embodiment of the mold.
１・・金型、２・・スプルー、３・・ランナー、４・・
製品ゲート部、５・・製品キャビティ、６・・ダミーゲ
ート部、７，７ａ，７ｂ，７ｃ，７ｄ・・樹脂溜り、８
・・サブランナー、９・・絞り部、１０・・拡張部。1 ... Mold, 2 ... Sprue, 3 ... Runner, 4 ...
Product gate part, 5 ... Product cavity, 6 ... Dummy gate part, 7, 7a, 7b, 7c, 7d ... Resin sump, 8
..Sub-runners, 9 ...
Claims (6)
連通したランナーの適宜部位に、ダミーゲートを介して
微小ボリュームの樹脂溜りを分岐形成した合成樹脂製品
の射出成形用金型。1. A mold for injection molding of a synthetic resin product, wherein a minute volume of resin reservoir is branched and formed through a dummy gate at an appropriate portion of a runner communicating with a product cavity through a product gate portion.
れらを介して同数又はそれより少数の樹脂溜りが設けら
れた請求項１に記載の合成樹脂製品の射出成形用金型。2. The mold for injection molding a synthetic resin product according to claim 1, wherein a plurality of the dummy gate portions are provided, and the same or a smaller number of resin reservoirs are provided through the dummy gate portions.
連通したランナーの適宜部位に、サブランナーを接続し
た合成樹脂製品の射出成用金型。3. A mold for injection molding a synthetic resin product, in which a sub-runner is connected to an appropriate portion of a runner communicating with a product cavity through a product gate section.
積が小さく、ランナーに延設されている請求項３に記載
の合成樹脂製品の射出成形用金型。4. The mold for injection molding a synthetic resin product according to claim 3, wherein the sub-runner has a smaller cross-sectional area than the runner and extends on the runner.
であり、ランナーに沿設されている請求項３に記載の合
成樹脂製品の射出成形用金型。5. The mold for injection molding a synthetic resin product according to claim 3, wherein the sub-runner is thinner than the runner and is provided along the runner.
出成用金型を使用し、ランナーに接続されたスプルーよ
り、溶融樹脂を実質的に一定の射出速度で注入すること
を特徴とした射出成形方法。6. The injection molding die according to claim 1, wherein molten resin is injected from a sprue connected to a runner at a substantially constant injection speed. Injection molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7135395A JPH08323817A (en) | 1995-06-01 | 1995-06-01 | Mold for injection molding synthetic resin product and injection molding method using the mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7135395A JPH08323817A (en) | 1995-06-01 | 1995-06-01 | Mold for injection molding synthetic resin product and injection molding method using the mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08323817A true JPH08323817A (en) | 1996-12-10 |
Family
ID=15150718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7135395A Pending JPH08323817A (en) | 1995-06-01 | 1995-06-01 | Mold for injection molding synthetic resin product and injection molding method using the mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08323817A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006303503A (en) * | 2005-04-19 | 2006-11-02 | Asml Netherlands Bv | Imprint lithography |
| JP2010247430A (en) * | 2009-04-15 | 2010-11-04 | Polyplastics Co | Method for determining presence of jetting phenomenon occurrence |
| WO2013063380A2 (en) * | 2011-10-28 | 2013-05-02 | Ticona Llc | System and process for molding polymeric articles while reducing gate blush |
| CN108136637A (en) * | 2015-07-31 | 2018-06-08 | 镜泰光学有限公司 | It is used to form system, mold and the method for ophthalmic lens |
| KR20230077853A (en) * | 2021-11-26 | 2023-06-02 | 주식회사우리엠텍 | Hot runner mold system |
-
1995
- 1995-06-01 JP JP7135395A patent/JPH08323817A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006303503A (en) * | 2005-04-19 | 2006-11-02 | Asml Netherlands Bv | Imprint lithography |
| US7762186B2 (en) | 2005-04-19 | 2010-07-27 | Asml Netherlands B.V. | Imprint lithography |
| JP4695009B2 (en) * | 2005-04-19 | 2011-06-08 | エーエスエムエル ネザーランズ ビー．ブイ． | Imprint lithography |
| US8349238B2 (en) | 2005-04-19 | 2013-01-08 | Asml Netherlands B.V. | Imprint lithography |
| JP2010247430A (en) * | 2009-04-15 | 2010-11-04 | Polyplastics Co | Method for determining presence of jetting phenomenon occurrence |
| WO2013063380A3 (en) * | 2011-10-28 | 2013-10-31 | Ticona Llc | System and process for molding polymeric articles while reducing gate blush |
| WO2013063380A2 (en) * | 2011-10-28 | 2013-05-02 | Ticona Llc | System and process for molding polymeric articles while reducing gate blush |
| CN103906617A (en) * | 2011-10-28 | 2014-07-02 | 提克纳有限责任公司 | System and process for molding polymeric articles while reducing gate blush |
| JP2014532574A (en) * | 2011-10-28 | 2014-12-08 | ティコナ・エルエルシー | System and method for molding polymer articles while reducing GATEBLUSH |
| US9878476B2 (en) | 2011-10-28 | 2018-01-30 | Ticona Llc | System and process for molding polymeric articles while reducing gate blush |
| US11230042B2 (en) | 2011-10-28 | 2022-01-25 | Ticona Llc | System and process for molding polymeric articles while reducing gate blush |
| CN108136637A (en) * | 2015-07-31 | 2018-06-08 | 镜泰光学有限公司 | It is used to form system, mold and the method for ophthalmic lens |
| US11084235B2 (en) | 2015-07-31 | 2021-08-10 | Gentex Optics, Inc. | System, mold and method for forming an ophthalmic lens |
| KR20230077853A (en) * | 2021-11-26 | 2023-06-02 | 주식회사우리엠텍 | Hot runner mold system |
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