JP2822331B2 - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JP2822331B2 JP2822331B2 JP23902389A JP23902389A JP2822331B2 JP 2822331 B2 JP2822331 B2 JP 2822331B2 JP 23902389 A JP23902389 A JP 23902389A JP 23902389 A JP23902389 A JP 23902389A JP 2822331 B2 JP2822331 B2 JP 2822331B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- rubber material
- vulcanization
- mold
- rubber
- 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 - Lifetime
Links
- 238000001746 injection moulding Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 claims description 24
- 238000004073 vulcanization Methods 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 206010013642 Drooling Diseases 0.000 description 2
- 208000008630 Sialorrhea Diseases 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
Landscapes
- Heating, Cooling, Or Curing Plastics Or The Like In General (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、ゴム製品の成形技術に係る射出成形方法に
関する。Description: TECHNICAL FIELD The present invention relates to an injection molding method according to a rubber product molding technique.
従来から、ゴム製品を成形する射出成形装置として、
第1図に示すように、上型(2)と下型(3)とよりな
る成形型(1)、上下の熱盤(4)(5)、およびスク
リュ(7)を内挿したノズル(6)を有するものが知ら
れており、ノズル(6)から成形型(1)のスプル部
(8)とランナ部(9)を介してキャビティ(10)内に
ゴム材料を射出充填し、ゴム材料を加硫成形している。
ノズル(6)は温調油路(11)を備えて約50〜80℃に加
熱され、成形型(1)は熱盤(4)(5)に挟まれて約
150〜200℃に加熱される。Conventionally, as an injection molding device for molding rubber products,
As shown in FIG. 1, a molding die (1) composed of an upper die (2) and a lower die (3), upper and lower hot plates (4) (5), and a nozzle (7) in which a screw (7) is inserted. A rubber material having a rubber material is injected into a cavity (10) from a nozzle (6) through a sprue portion (8) and a runner portion (9) of a mold (1). The material is vulcanized.
The nozzle (6) is provided with a temperature control oil passage (11) and is heated to about 50 to 80 ° C., and the mold (1) is sandwiched between hot plates (4) and (5).
Heated to 150-200 ° C.
このようにしてゴム製品を成形する場合、射出完了
後、直ちにノズル(6)をバックさせるとスプル部
(8)に充填されたゴム材料が熱膨張や型(1)内外の
圧力差によって湧き出すように盛り上がり(第2図のA
部参照)、成形品を離型するときにこの部分が型(1)
に残って、次の成形時に不良を来すことがある。またノ
ズル(6)からのいわゆる鼻垂れの問題もあり、これら
の問題に対処するため、従来は、ノズル(6)を最後ま
で成形型(1)にタッチさせたまま成形を行なうか、あ
るいは加硫の終了を待ってノズル(6)をバックさせて
いた。When the rubber product is molded in this manner, immediately after the injection is completed, if the nozzle (6) is backed, the rubber material filled in the sprue portion (8) flows out due to thermal expansion or a pressure difference between the inside and outside of the mold (1). (A in FIG. 2)
Part), this part is the mold (1) when releasing the molded product.
And may cause defects during the next molding. There is also a problem of so-called drooling from the nozzle (6). In order to deal with these problems, conventionally, molding is performed while the nozzle (6) is kept in contact with the molding die (1) until the end, or molding is performed. Waiting for the completion of the sulfurization, the nozzle (6) was backed up.
上記したようにノズル(6)と成形型(1)には100
℃程度の温度差があるため、ノズル(6)を成形型
(1)にタッチさせたままにしておくと成形型(1)の
熱がノズル(6)に移動して、成形型(1)のノズルタ
ッチ部分(1′)の温度が他の部分より10〜20℃程度低
くなる。したがって、例えばパッキン類のようにキャビ
ティ(10)のゴム容量とスプル部(8)のゴム容量とに
大差がないものについて、キャビティ(10)部分のゴム
材料に合わせて加硫時間を設定すると、スプル部(8)
部分のゴム材料の加硫度合が足りないこととなり、該ス
プル(8)部分のゴム材料が離型時に千切れて型(1)
内に残ってしまう。このようなことがあると、やはり、
次の成形時に支障を来すことから、従来は、前記スプル
(8)部分のゴム材料が千切れない程度となるまで加硫
時間を延長しなければならなかった。As described above, 100 for nozzle (6) and mold (1)
Since there is a temperature difference of about ° C., if the nozzle (6) is kept in contact with the mold (1), the heat of the mold (1) moves to the nozzle (6), and the mold (1) The temperature of the nozzle touch portion (1 ') becomes lower by about 10 to 20 ° C. than other portions. Therefore, if there is no significant difference between the rubber capacity of the cavity (10) and the rubber capacity of the sprue portion (8) such as packings, if the vulcanization time is set according to the rubber material of the cavity (10), Sprue part (8)
The degree of vulcanization of the rubber material of the portion is insufficient, and the rubber material of the sprue (8) is cut off at the time of release from the mold (1).
Will remain inside. After all this,
Conventionally, the vulcanization time had to be extended until the rubber material in the sprue (8) portion was not broken up, because it would hinder the next molding.
本発明は以上の点に鑑み、上記従来技術にみられる問
題を解消して加硫時間を短縮することを目的とするもの
で、この目的を達成するため、スクリュを内挿したノズ
ルから成形型のスプル部を介してキャビティにゴム材料
を射出充填し、前記ゴム材料を加硫成形する射出成形方
法において、射出充填後、ノズルバックするまでの間に
サックバックを行ない、かつ、スプル部に充填されたゴ
ム材料の加硫がある程度進行した時点でノズルバックを
行ない、引き続き、加硫を行なうこととした。The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems in the prior art and shorten the vulcanization time. To achieve this object, a molding die is inserted from a nozzle in which a screw is inserted. Injection-filling a cavity with a rubber material through a sprue part, vulcanizing the rubber material, performing a suck-back after injection filling until a nozzle back, and filling the sprue part. When the vulcanization of the rubber material has progressed to some extent, nozzle back is performed, and then vulcanization is performed.
サックバックは、ノズルを成形型にタッチさせたまま
スクリュだけバックさせるものであり、射出完了後、こ
のサックバックを行なうことによりノズルからの鼻垂れ
をなくすことができる。またスプル部に充填されたゴム
材料の加硫がある程度進行してからノズルをバックさせ
ると、ゴム材料が硬化または半硬化してからノズルをバ
ックさせることになるため、ゴム材料が従来のように盛
り上がることがない。発明者らが行なった実験による
と、ノズルバックを行なうのは、キャビティのゴム容量
とスプル部のゴム容量が略同じであるとしてキャビティ
に充填されたゴム材料の必要加硫時間の1/3〜1/2が経過
た時点が好適である。このように加硫の中途でノズルを
バックさせると、、該バック以後の成形型のノズルタッ
チ部分の温度を上昇させて加硫を促進し、加硫時間を短
かめに設定することができる。The suck back is to back the screw only while keeping the nozzle in contact with the mold. By performing the suck back after the injection is completed, dripping from the nozzle can be eliminated. Also, if the nozzle is backed after the vulcanization of the rubber material filled in the sprue part has progressed to some extent, the rubber material will be cured or semi-cured and then the nozzle will be backed, so the rubber material will be No excitement. According to an experiment performed by the inventors, performing nozzle back is performed by assuming that the rubber capacity of the cavity and the rubber capacity of the sprue portion are substantially the same, and the required vulcanization time of the rubber material filled in the cavity is 1/3 to The time when 1/2 has elapsed is preferable. When the nozzle is backed in the middle of the vulcanization in this way, the temperature of the nozzle touching portion of the mold after the back is raised to accelerate the vulcanization, and the vulcanization time can be set shorter.
第1図に示した射出成形装置によってゴム製品を成形
する場合、ノズル(6)からスプル部(8)、ランナ部
(9)を介してキャビティ(10)にゴム材料を射出充填
した後、直ちにサックバックを行ない、スクリュ(7)
を実寸で1mm程度後退させる。当該装置は60〜100秒でキ
ャビティ(10)に充填したゴム材料を加硫するようにな
っており、この必要加硫時間の1/3〜1/2(20〜50秒)の
時間が経過したところでノズルバックを行なって、残り
の時間、加硫を続行する。このようにしてゴム製品を成
形することにより、ゴム材料の鼻垂れや盛り上がりを防
止した上で加硫時間をキャビティ(10)部分(製品部)
の加硫に必要な時間に止め、該時間の延長を不要とする
ことができる。When a rubber product is molded by the injection molding apparatus shown in FIG. 1, immediately after the rubber material is injected and filled into the cavity (10) from the nozzle (6) through the sprue section (8) and the runner section (9). Suck back and screw (7)
Is retracted by about 1 mm in actual size. The device vulcanizes the rubber material filled in the cavity (10) in 60 to 100 seconds, and 1/3 to 1/2 (20 to 50 seconds) of the required vulcanization time elapses. The nozzle back is performed at this point, and vulcanization is continued for the remaining time. By molding the rubber product in this way, the rubber material is prevented from drooling and rising, and the vulcanization time is reduced by the cavity (10) part (product part).
To the time required for vulcanization of the rubber, and it is not necessary to extend the time.
本発明の射出成形方法は以上説明したように、射出充
填後、ノズルバックするまでの間にサックバックを行な
い、かつ、スプル部に充填されたゴム材料の加硫がある
程度進行した時点でノズルバックを行ない、引き続き、
加硫を行なうようにしたもので、ゴム材料がノズルから
垂れたり、成形型に充填したゴム材料が盛り上がったり
しないようにした上で加硫時間を従来より短縮すること
ができる。As described above, the injection molding method of the present invention performs suck-back after injection filling and before nozzle back, and at the time when the vulcanization of the rubber material filled in the sprue part has progressed to some extent, And continue to
The vulcanization is performed so that the rubber material is prevented from dripping from the nozzle and the rubber material filled in the mold is not raised, and the vulcanization time can be shortened as compared with the related art.
第1図は従来一般の射出成形装置を示す要部半裁断面
図、第2図は作動図である。 (1)成形型、(2)上型、(3)下型 (4)(5)熱盤、(6)ノズル、(7)スクリュ (8)スプル部、(9)ランナ部 (10)キャビティ、(11)温調油路FIG. 1 is a half sectional view of a main part showing a conventional general injection molding apparatus, and FIG. 2 is an operation view. (1) Mold, (2) Upper die, (3) Lower die (4) (5) Hot plate, (6) Nozzle, (7) Screw (8) Sprue part, (9) Runner part (10) Cavity , (11) Temperature control oil passage
Claims (1)
ら成形型(1)のスプル部(8)を介してキャビティ
(10)にゴム材料を射出充填し、前記ゴム材料を加硫成
形する射出成形方法において、射出充填後、ノズルバッ
クするまでの間にサックバックを行ない、かつ、スプル
部(8)に充填されたゴム材料の加硫がある程度進行し
た時点でノズルバックを行ない、引き続き、加硫を行な
うことを特徴とする射出成形方法。1. A rubber material is injected and filled into a cavity (10) from a nozzle (6) in which a screw (7) is inserted through a sprue portion (8) of a molding die (1), and the rubber material is vulcanized. In the injection molding method of performing molding, suck back is performed before injection back after injection filling, and nozzle back is performed when vulcanization of the rubber material filled in the sprue portion (8) has progressed to some extent, An injection molding method characterized by subsequently performing vulcanization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23902389A JP2822331B2 (en) | 1989-09-14 | 1989-09-14 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23902389A JP2822331B2 (en) | 1989-09-14 | 1989-09-14 | Injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0399818A JPH0399818A (en) | 1991-04-25 |
| JP2822331B2 true JP2822331B2 (en) | 1998-11-11 |
Family
ID=17038737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23902389A Expired - Lifetime JP2822331B2 (en) | 1989-09-14 | 1989-09-14 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2822331B2 (en) |
-
1989
- 1989-09-14 JP JP23902389A patent/JP2822331B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0399818A (en) | 1991-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 12 Free format text: PAYMENT UNTIL: 20100904 |