JPH0624745B2 - Nipple manufacturing method - Google Patents
Nipple manufacturing methodInfo
- Publication number
- JPH0624745B2 JPH0624745B2 JP12454790A JP12454790A JPH0624745B2 JP H0624745 B2 JPH0624745 B2 JP H0624745B2 JP 12454790 A JP12454790 A JP 12454790A JP 12454790 A JP12454790 A JP 12454790A JP H0624745 B2 JPH0624745 B2 JP H0624745B2
- Authority
- JP
- Japan
- Prior art keywords
- pin
- gas vent
- vent hole
- core
- nipple
- 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
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
- B29C45/34—Moulds having venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
- B29K2083/005—LSR, i.e. liquid silicone rubbers, or derivatives thereof
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は乳首の製造方法、特にはエア溜り、ガス焼け、
未充填、異物混入のない品質のよい乳首を射出成形法で
製造する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a method for manufacturing a nipple, particularly an air reservoir, a gas burner,
The present invention relates to a method for producing a high-quality nipple that is unfilled and free of foreign matter by injection molding.
（従来の技術） 従来、乳首の製造方法はイソプレンゴム、シリコーンゴ
ムを主材とし、これを製品重量に合わせて一定量計量し
たのち、プレス金型に入れ、直圧成形することによって
行なわれている。(Prior Art) Conventionally, the manufacturing method of a nipple is carried out by using isoprene rubber or silicone rubber as a main material, weighing a certain amount according to the weight of the product, putting it in a press mold, and performing direct pressure molding. There is.
しかし、この製造方法では成形サイクルが長く、しかも
製品１個分の原料を計量してから型に入れなければなら
ないので、作業性がわるく、製造コストも高くなるとい
う問題点がある。However, this manufacturing method has a problem in that the molding cycle is long and the raw material for one product must be weighed and put into the mold, resulting in poor workability and high manufacturing cost.
このため、作業性の向上、コスト低減ということから、
これについては射出成形も検討されているが、この場合
にはキャビテイ内のエアの排除方法に問題があり、コア
先端の焼結金属化、あるいはガス抜き孔への発泡部材取
付けなども提案されている。Therefore, from the viewpoint of improving workability and cost reduction,
Injection molding is also being considered for this, but in this case there is a problem with the method of eliminating air in the cavity, and it has been proposed to use sintered metal at the tip of the core or attach a foam member to the gas vent hole. There is.
また、この乳首材料についてはイソプレンゴムでは老化
防止剤として使用されているジブチルヒドロキシトルエ
ンが安定性の面から問題となっていることから、シリコ
ーンゴムの使用が増加しつつあるのであるが、このシリ
コーンゴムについてもいわゆるミラブルゴムでは素練り
後に加硫剤などを添加する混練り、分出しが必要である
ために工程が長く、異物が入り込む場合もあるために、
最近ではクローズシステムで作られる液状シリコーンゴ
ムを射出成形する方法が注目されている。Regarding this nipple material, the use of silicone rubber is increasing because dibutylhydroxytoluene, which is used as an antioxidant in isoprene rubber, is a problem from the viewpoint of stability. As for rubber, so-called millable rubber is kneaded by adding a vulcanizing agent and the like after mastication, and the process is long because it needs to be dispensed.
Recently, attention has been focused on a method of injection molding a liquid silicone rubber produced by a closed system.
（発明が解決しようとする課題） しかし、この液状シリコーンゴムの射出成形では、流動
性がよいために上記した焼結金属の微細孔や発泡部材の
中までこれが入り込み、キャビティ内のエア排除が不充
分となるために、得られる乳首がエア溜りをもつもの、
あるいは未充填のものとなり易く、射出後にバンビング
圧縮成形をするという不合理な形成法を行なわなければ
ならないという不利がある。(Problems to be solved by the invention) However, in the injection molding of this liquid silicone rubber, since it has a good fluidity, it penetrates into the fine holes of the sintered metal or into the foamed member, and it is difficult to eliminate air in the cavity. The resulting nipple has an air pocket in order to be sufficient,
Alternatively, it tends to be unfilled, and there is a disadvantage in that an irrational forming method of performing compression molding with bumping after injection must be performed.
（課題を解決するための手段） 本発明はこのような不利を解決した乳首の製造方法に関
するものであり、これはコアを有する上型または下型と
コアが嵌入するキャビティを有する下型または上型より
なる金型の、コアの頂部にガス抜き孔を設け、これをコ
ア内部に設けられたスプリングに保持されたピンで塞い
だ状態とし、上下金型のパーティング面で、かつ乳首の
外周鍔部の外側に設けたゲートから液状のシリコーンゴ
ムを前記キャビテイに充填し、キャビテイ内のエアを上
記ガス抜き孔とピンとの隙間から排出するようにした射
出成形方法において、ピンおよびピンと接するガス抜き
孔の接触部の表面粗さがJIS B 0601で1.5-S 以上に精密
仕上げされたものであることを特徴とする乳首の製造方
法。(Means for Solving the Problem) The present invention relates to a method for manufacturing a nipple that solves such disadvantages, which is an upper mold or a lower mold having a core and a lower mold or an upper mold having a cavity into which the core is fitted. Form a gas vent hole at the top of the core of the mold consisting of a mold, and close it with a pin held by a spring provided inside the core, and use the parting surface of the upper and lower molds and the outer circumference of the nipple. In the injection molding method, in which the liquid silicone rubber is filled into the cavity from a gate provided outside the flange portion and the air in the cavity is discharged from the gap between the gas vent hole and the pin, the gas vent contacting the pin and the pin is removed. A method for manufacturing a nipple, characterized in that the surface roughness of the contact portion of the hole is precisely finished to 1.5-S or more according to JIS B 0601.
すなわち、本発明者らはキャビティ内のエア排除を完全
なものとしてエア溜りや未充填の乳首ができないように
する乳首の射出成形方法について種々検討した結果、ガ
ス抜き孔をコア頂部に開口させてこのガス抜き孔をピン
で塞ぐようにし、キャビティ内に液状シリコーンゴムを
充填することによってキャビティ内の空気をガス抜き孔
に送り、このときピンとガス抜き孔との接触部の表面粗
さを例えばJIS B 0601で規定されている1.5-S 以上に精
密仕上げをしておけば、この空気がピンとガス抜き孔と
の隙間から外部に排出されるし、このピンとガス抜き孔
との隙間にシリコーンゴムが入り込むこともなくなるの
で、目的とする乳首がエア溜りをもつもの、または未充
填のものになるということもなくなるということを見出
して本発明を完成させた。That is, the present inventors have variously studied the injection molding method of the nipple that completely eliminates the air in the cavity so that an air reservoir and an unfilled nipple cannot be formed.As a result, a gas vent hole is opened at the top of the core. The gas vent hole is closed with a pin, and air in the cavity is sent to the gas vent hole by filling the cavity with liquid silicone rubber. At this time, the surface roughness of the contact portion between the pin and the gas vent hole is defined by, for example, JIS. If the precision finish is 1.5-S or more specified in B 0601, this air will be discharged to the outside through the gap between the pin and the gas vent hole, and the silicone rubber will be placed in the gap between the pin and the gas vent hole. The present invention has been completed by finding that the target nipple does not have an air pocket or become unfilled because it does not enter. .
以下にこれをさらに詳述する。This will be described in more detail below.
（作用） 本発明は液状シリコーンゴムから射出成形法で乳首を製
造する方法に関するものである。(Operation) The present invention relates to a method for producing a nipple from a liquid silicone rubber by an injection molding method.
以下、これを添付の図面にもとづいて説明する。第１図
は本発明において使用される金型の縦断面図を示したも
のである。図にコア５を有する上型１とコアを嵌合する
キャビティ４を有する下型２からなる金型が閉じられた
状態で示されている。このコア５にはその頂部にガス抜
き孔６が設けられており、このガス抜き孔６はスプリン
グ９に保持されているピン８がテーパー部（接触部）７
と接することによって塞がれている。射出成形はパーテ
ィングライン３のランナー10およびゲートから乳首の外
周鍔部９への液状シリコーンゴムの充填、その後のコア
先端部までの液状シリコーンゴムの充填後における射出
成形で行なわれるが、この射出成形時にはキャビティ内
に存在するガスはガス抜き孔６からピン８との接触部７
を通過して外部に排出されるので、ここに得られる乳首
はエア溜りを有するもの、さらには未充填のものとなる
ということはない。Hereinafter, this will be described with reference to the accompanying drawings. FIG. 1 shows a vertical sectional view of a mold used in the present invention. In the figure, a mold including an upper mold 1 having a core 5 and a lower mold 2 having a cavity 4 into which the core is fitted is shown in a closed state. The core 5 is provided with a gas vent hole 6 at the top thereof. In the gas vent hole 6, a pin 8 held by a spring 9 has a tapered portion (contact portion) 7.
It is blocked by touching. The injection molding is performed by filling the liquid silicone rubber from the runner 10 and the gate of the parting line 3 into the outer collar 9 of the nipple, and then filling the liquid silicone rubber up to the tip of the core. The gas existing in the cavity at the time of molding is discharged from the gas vent hole 6 to the contact portion 7 with the pin 8.
Since it is discharged to the outside after passing through, the nipple obtained here does not have an air reservoir or an unfilled one.
なお、この場合、ガス抜き孔６とピン８との接触部７で
の接触はその表面粗さが大きいとこの部分に液状シリコ
ーンゴムが入り込んでここにエア溜りが発生したり、未
充填ということも発生するので、これはJIS B 0601で規
定されている 1.5-S以上、好ましくは0.8-S 以上の精密
仕上げとする必要があるし、このピン８はスプリング９
に保持されているが、これはコア５とピン８と材質が異
なるもので熱膨張の違いが生じた場合でもガス抜き孔６
とピン８との接触をより強固に行なわせるためのもので
ある。In this case, the contact between the degassing hole 6 and the pin 8 at the contact portion 7 means that if the surface roughness is large, the liquid silicone rubber will enter this portion and an air pocket will be generated or unfilled. Since it also occurs, it is necessary to have a precision finish of 1.5-S or more, preferably 0.8-S or more as specified in JIS B 0601.
The core 5 and the pin 8 are made of different materials, and even if a difference in thermal expansion occurs, the gas vent hole 6 is held.
This is for making the contact between the pin 8 and the pin 8 stronger.
（実施例） つぎに本発明の実施例をあげる。(Example) Next, the Example of this invention is given.
実施例 液状シリコーンゴム・KE 1925 AT/BT ［信越化学工業
（株）製商品名］を第１図に示したような金型を使用
し、射出成形機・EMVI-35E-50LIM［（株）松田製作所製
商品名］を用いて、成形温度 180℃で射出圧１次／２
次：240kg/120kg （樹脂圧）［切換えはキャビティ90％
充填後］で射出成形することとし、この金型は乳首４ケ
取りでガス抜き孔とピンとの接触部の表面粗さがJIS B
0601で0.8-S に精密仕上げされているものを使用して連
続50シヨットの成形を行なったところ、成形サイクルは
硬化時間30秒にて１分間というものであり、得られた乳
首はすべてガス溜りがなく、また未充填でもない良好な
ものであった。Example A liquid silicone rubber KE 1925 AT / BT [trade name of Shin-Etsu Chemical Co., Ltd.] is used with a mold as shown in FIG. 1, and an injection molding machine EMVI-35E-50LIM [Co., Ltd.] [Matsuda Mfg. Brand name], molding temperature 180 ° C, injection pressure primary / 2
Next: 240kg / 120kg (resin pressure) [Cavity 90% switching
After filling], injection molding is performed. This mold has four nipples and the surface roughness of the contact part between the gas vent hole and the pin is JIS B.
When 50 consecutive yachts were molded using the 0601 precision finished product of 0601, the molding cycle was 30 seconds for 1 minute, and the obtained nipples were all gas traps. It was a good one with no filling and no filling.
比較例 上記の実施例におけるガス抜き孔とピンとの接触部の表
面粗さをJIS B 0601における３−Ｓとしたほかは実施例
１と同じ条件で連続10シヨットの成形を行なったとこ
ろ、最初の１シヨット以外はすべて未充填となったので
金型を点検したところ、ガス抜き孔とンピンとの間にシ
リコーンゴムが入り込んでいることが確認された。COMPARATIVE EXAMPLE A continuous 10-sheath molding was performed under the same conditions as in Example 1 except that the surface roughness of the contact portion between the gas vent hole and the pin in the above example was set to 3-S in JIS B 0601. All but one yacht was unfilled, so when the mold was inspected, it was confirmed that silicone rubber had entered between the gas vent and the pin.
（発明の効果） 本発明は射出成形法で乳首を製造する方法に関するもの
で、これは前記したようにコアの頂部にガス抜き孔を設
け、これをスプリングに保持されたピンで塞ぎ、液状シ
リコーンゴムを充填してキャビティ内の空気をガス抜き
孔とピンとの隙間から排出させて射出成形するものであ
り、かつ、このガス抜き孔とピンとの接触部の表面粗さ
をJIS B 0601の 1.5-S以上に精密仕上げするものである
が、これによれば射出成形時にキャビティ内の空気が容
易に除去され、このガス抜き孔とピンとの接触部にシリ
コーンゴムが入り込むこともないので、エア溜り、ガス
焼け、未充填、異物混入などのない品質のよい乳首を容
易に得ることができるとう有利性が与えられる。(Effect of the Invention) The present invention relates to a method for manufacturing a nipple by an injection molding method. As described above, a gas vent hole is provided at the top of a core, which is closed by a pin held by a spring, and a liquid silicone is used. It is filled with rubber and the air in the cavity is discharged from the gap between the gas vent hole and the pin for injection molding, and the surface roughness of the contact part between the gas vent hole and the pin is 1.5-JIS B 0601. Although it is finished more precisely than S, this allows air in the cavity to be easily removed during injection molding, and since silicone rubber does not enter the contact area between the gas vent hole and the pin, an air trap, This provides an advantage that a high quality nipple free from gas burning, unfilling, foreign matter inclusion, etc. can be easily obtained.
第１図は本発明で使用される金型の縦断面図を示したも
のである。 １……上型、２……下型 ３……パーティングライン ４……キャビティ、５……コア ６……ガス抜き孔 ７……テーパー部（接触部）、８……ピン ９……スプリングFIG. 1 is a vertical sectional view of a mold used in the present invention. 1 ... Upper mold, 2 ... Lower mold 3 ... Parting line 4 ... Cavity, 5 ... Core 6 ... Gas vent hole 7 ... Taper part (contact part), 8 ... Pin 9 ... Spring
Claims (1)
するキャビティを有する下型または上型よりなる金型
の、コアの頂部にガス抜き孔を設け、これをコア内部に
設けられたスプリングに保持されたピンで塞いだ状態と
し、上下金型のパーティングライン面で、かつ乳首の外
周鍔部の外側に設けたゲートから液状シリコーンゴムを
前記キャビテイに充填し、キャビテイ内の空気を上記ガ
ス抜き孔とピンとの隙間から排出するようにした射出成
形方法において、ピンおよびピンと接するガス抜き孔の
接触部の表面粗さがJIS B 0601で1.5-S 以上に精密仕上
げされたものであることを特徴とする乳首の製造方法。1. A metal mold comprising an upper mold or a lower mold having a core and a lower mold or an upper mold having a cavity into which the core is fitted, is provided with a gas vent hole at the top of the core, which is provided inside the core. Fill the cavity with liquid silicone rubber from the gate provided on the parting line surface of the upper and lower molds and outside the outer collar of the nipple, with the pin held by the spring closed, and remove the air inside the cavity. In the injection molding method in which the gas is discharged from the gap between the gas vent hole and the pin, the surface roughness of the contact portion of the pin and the gas vent hole that is in contact with the pin is precisely finished to 1.5-S or more according to JIS B 0601. A method for manufacturing a nipple, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12454790A JPH0624745B2 (en) | 1990-05-15 | 1990-05-15 | Nipple manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12454790A JPH0624745B2 (en) | 1990-05-15 | 1990-05-15 | Nipple manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0419117A JPH0419117A (en) | 1992-01-23 |
| JPH0624745B2 true JPH0624745B2 (en) | 1994-04-06 |
Family
ID=14888179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12454790A Expired - Lifetime JPH0624745B2 (en) | 1990-05-15 | 1990-05-15 | Nipple manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624745B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009039588A1 (en) * | 2007-09-28 | 2009-04-02 | Poppet International Pty Ltd | Method and apparatus for formation of a moulded aperture |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5665281A (en) * | 1993-12-02 | 1997-09-09 | Motorola, Inc. | Method for molding using venting pin |
| US6032810A (en) * | 1997-07-17 | 2000-03-07 | Gerber Products Company | One-piece nipple/collar for nursers and the like |
| JP2009509805A (en) * | 2005-10-03 | 2009-03-12 | メディカルラバー アーベー | Method and machine for manufacturing hollow products |
| CA2644531A1 (en) | 2006-03-01 | 2007-09-07 | Coloplast A/S | Urisheath with moulded unrolling strip |
| WO2018231597A1 (en) * | 2017-06-12 | 2018-12-20 | Carr Lane Quackenbush | Method for improving a bite-safe artificial teat and like products |
-
1990
- 1990-05-15 JP JP12454790A patent/JPH0624745B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009039588A1 (en) * | 2007-09-28 | 2009-04-02 | Poppet International Pty Ltd | Method and apparatus for formation of a moulded aperture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0419117A (en) | 1992-01-23 |
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