JPH01290407A - Method for molding hinged cap - Google Patents
Method for molding hinged capInfo
- Publication number
- JPH01290407A JPH01290407A JP63120994A JP12099488A JPH01290407A JP H01290407 A JPH01290407 A JP H01290407A JP 63120994 A JP63120994 A JP 63120994A JP 12099488 A JP12099488 A JP 12099488A JP H01290407 A JPH01290407 A JP H01290407A
- Authority
- JP
- Japan
- Prior art keywords
- lid
- lid body
- slide core
- core
- cap
- 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
- 238000000465 moulding Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims abstract description 5
- 238000001746 injection moulding Methods 0.000 claims abstract description 8
- 229920003002 synthetic resin Polymers 0.000 claims description 6
- 239000000057 synthetic resin Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 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
- B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
- B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
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)
- Closures For Containers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、合成樹脂製ヒンジキャップの成形方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for molding a synthetic resin hinge cap.
［従来の技術］
合成樹脂製のヒンジキャップで、その蓋がヒンジを介し
てキャップと一体に成形されたものがある。この種のヒ
ンジキャップは、通常射出成形により製造されるが、第
３図に示すようにキャップａが末広がり型であると、そ
のヒンジ蓋す側がアンダーカットとなるため、必然的に
スライドコアＣを用いて成形することになる。[Prior Art] There is a synthetic resin hinged cap whose lid is integrally molded with the cap via a hinge. This type of hinge cap is usually manufactured by injection molding, but if the cap a is flared at the end as shown in Figure 3, the hinge lid side will be undercut, so the slide core C will inevitably be It will be molded using
［発明が解決しようとする課題］
上記のようなヒンジキャップの射出成形において、前記
スライドコアＣを離型するには前記蓋すが邪魔になるた
め、第４図に示すように蓋すをピストン式の押上装置ｄ
によってスライドコアＣから押し出さねばならないが、
合成樹脂が完全に硬化する前に行われるため、蓋すの表
面にロッドｅの押し跡が付き、キャップの商品価値を著
しく低下させてしまう。[Problems to be Solved by the Invention] In the injection molding of the hinge cap as described above, the lid gets in the way of releasing the slide core C, so as shown in FIG. type push-up device d
It must be pushed out from slide core C by
Since this is carried out before the synthetic resin is completely cured, the surface of the lid is left with marks from the rod e, which significantly reduces the commercial value of the cap.
このような事態を防止するには、例えば金型を分割して
スライドコアの離型時に蓋すが邪魔にならないようにす
れば良いけれども、′金型の数が増えて高価となり、か
つ製造の準備が厄介となって作業能率の低下を来す等の
不都合が生じることになる。In order to prevent such a situation, for example, the mold could be divided into parts so that the lid would not get in the way when the slide core is released from the mold, but this would increase the number of molds, increase the cost, and increase production time. Preparation becomes troublesome, leading to inconveniences such as a decrease in work efficiency.
［課題を解決するための手段コ
本発明は、前記のような従来の事態に対処するためにな
され、その技術的な解決手段しては、キャップ本体にヒ
ンジを介して蓋体が一体成形され、前記蓋体は周壁が末
広がりで内面には筒栓が突設されたヒンジキャップを合
成樹脂で射出成形する場合において、前記筒栓の先端部
にアンダーカットを成形し、このアンダーカットを介し
て離型の際に金型の上昇により前記蓋体を持ち上げ、そ
の蓋体成形用のスライドコアから外すことを要旨とする
ものである。[Means for Solving the Problems] The present invention was made in order to cope with the conventional situation as described above, and its technical solution is that the lid body is integrally formed with the cap body via a hinge. In the case where the lid body is made of synthetic resin and is injection molded with a hinge cap having a peripheral wall that widens at the end and a cylindrical plug protruding from the inner surface, an undercut is molded at the tip of the cylindrical plug, and the cap is inserted through the undercut. The gist of this method is to lift the lid by lifting the mold during mold release and remove it from the slide core for molding the lid.
［作 用コ
射出成形後、離型の際に金型詳しくは蓋コアの上昇に伴
って蓋体が持ち上げられてスライドコアから自動的に外
れるので、押上装置が不要となり蓋体に押し跡等の傷が
付かず、かつスライドコアの離型を円滑に行うことが出
来る。[Function] After injection molding, when releasing the mold, the lid is lifted and automatically removed from the slide core as the lid core rises, eliminating the need for a push-up device and leaving no pressure marks on the lid. The slide core can be smoothly released from the mold without causing any scratches.
［実施例コ
以下、図示の実施例により本発明を更に詳しく説明する
。[Examples] The present invention will be explained in more detail below with reference to illustrated examples.
１はキャップ本体であり、上面に排出口１ａを有すると
共に、上端部の側縁にはヒンジ２を介して蓋体３が連設
されている。この蓋体３は周壁が末広がり（図では倒置
しているので上方に広がっている）で内面には前記排出
口１ａに係合する筒栓３ａが突設され、その先端部はア
ンダーカット３ｂに成形されている。Reference numeral 1 denotes a cap body, which has a discharge port 1a on its upper surface, and has a lid 3 connected to the side edge of the upper end via a hinge 2. This lid body 3 has a circumferential wall that widens toward the end (in the figure, since it is inverted, it expands upward), and a cylindrical plug 3a that engages with the discharge port 1a is protruded from the inner surface, and the tip thereof is formed into an undercut 3b. Molded.
上記の構成を宵するキャップは、従来と同様に合成樹脂
の射出成形により製造され、この成形時において前記蓋
体３は、第１図に示すようにスライドコア４と蓋コア５
との間に挟まれた格好になる。The cap having the above-mentioned structure is manufactured by injection molding of synthetic resin as in the past, and during this molding, the lid body 3 has a slide core 4 and a lid core 5, as shown in FIG.
You will end up caught between the two.
射出成形後に離型するが、本発明の場合には、前記のよ
うに蓋体３の筒栓３ａの先端がアンダーカット３ｂに成
形されるので、前記蓋コア５を上昇させると、アンダー
カット３ｂが引っ掛かって蓋体３が蓋コアと共に上昇し
、前記スライドコア４から自動的に外れる。この後、第
２図に示すようにスライドコア４を横方向にスライドさ
せて離型することが出来る。このとき、前記ヒンジ２は
スライドコア４の端部の突起４ａにより押されて反時計
回りに回動するので、前記蓋体３は更に上方に持ち上げ
られ、スライドコア４の離型抵抗は殆ど無く、極めて円
滑に外すことが出来る。これにより、従来のように蓋体
３を強制的に外すための押上装置は不要となり、蓋体に
押し跡が付くことは全くない。Although the mold is released after injection molding, in the case of the present invention, the tip of the cylindrical plug 3a of the lid body 3 is molded into the undercut 3b as described above, so when the lid core 5 is raised, the undercut 3b is formed. is caught, the lid body 3 rises together with the lid core, and is automatically removed from the slide core 4. Thereafter, as shown in FIG. 2, the slide core 4 can be slid laterally and released from the mold. At this time, the hinge 2 is pushed by the protrusion 4a at the end of the slide core 4 and rotates counterclockwise, so the lid 3 is further lifted upward, and there is almost no mold release resistance of the slide core 4. , it can be removed very smoothly. As a result, there is no need for a push-up device for forcibly removing the lid 3 as in the past, and no push marks are left on the lid.
［発明の効果］
以上説明したように、本発明によれば蓋付きキャップの
射出成形において、その蓋の内面に突設する筒栓の先端
部をアンダーカットに成形したので、離型時に蓋コアを
上昇させるとその上昇にともなって蓋がスライドコアか
ら自動的に外れ、このため蓋の押上装置による押し跡を
完全に防止して商品価値を高めることが出来、かつスラ
イドコアの離型を円滑にすると共に、金型構造が従来と
変わらないから作業能率の低下及びコスト高を防止でき
る等の優れた効果を奏する。[Effects of the Invention] As explained above, according to the present invention, in injection molding of a cap with a lid, the tip of the cylindrical stopper protruding from the inner surface of the lid is formed into an undercut, so that the lid core is removed when the mold is released. When the lid is raised, the lid automatically comes off from the slide core as it rises, which completely prevents the lid from being pushed by the push-up device, increasing the product value, and facilitating the release of the slide core from the mold. In addition, since the mold structure remains the same as before, it has excellent effects such as preventing a decrease in work efficiency and an increase in costs.
第１図は本発明の実施例を示す要部の断面図、第２図は
蓋コアを外した後スライドコアを離型する状態を示す要
部の断面図、第３図は従来例の説明図、第４図は従来の
押上装置により蓋を強制的に外す状態を示す要部の断面
図である。
１・・・キャップ本体
１ａ・・・排出口
２・・・ヒンジ
３・・・蓋体
３ａ・・・筒栓
３ｂ・・・アンダーカット
４・・・スライドコア
５・・・蓋コアFig. 1 is a sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a sectional view of the main part showing the state in which the slide core is released from the mold after removing the lid core, and Fig. 3 is an explanation of the conventional example. 4 are sectional views of main parts showing a state in which the lid is forcibly removed by a conventional push-up device. 1... Cap body 1a... Discharge port 2... Hinge 3... Lid body 3a... Cylinder stopper 3b... Undercut 4... Slide core 5... Lid core
Claims (1)
記蓋体は周壁が末広がりで内面には筒栓が突設されたヒ
ンジキャップを合成樹脂で射出成形する方法において、
前記筒栓の先端部にアンダーカットを成形し、このアン
ダーカットを介して離型の際に金型の上昇により前記蓋
体を持ち上げ、その蓋体成形用のスライドコアから外す
ことを特徴とするヒンジキャップの成形方法。A method of injection molding a hinged cap made of synthetic resin, in which a lid body is integrally molded with a cap body via a hinge, and the lid body has a peripheral wall that widens toward the end and a cylindrical stopper protruding from the inner surface,
An undercut is formed at the tip of the cylindrical stopper, and when the mold is released through the undercut, the mold is raised to lift the lid and remove it from the slide core for molding the lid. How to form a hinge cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63120994A JPH0657418B2 (en) | 1988-05-18 | 1988-05-18 | Hinge cap molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63120994A JPH0657418B2 (en) | 1988-05-18 | 1988-05-18 | Hinge cap molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01290407A true JPH01290407A (en) | 1989-11-22 |
| JPH0657418B2 JPH0657418B2 (en) | 1994-08-03 |
Family
ID=14800150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63120994A Expired - Lifetime JPH0657418B2 (en) | 1988-05-18 | 1988-05-18 | Hinge cap molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0657418B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021217224A1 (en) * | 2020-04-28 | 2021-11-04 | Albea Do Brasil Embalagens Ltda | Cap for a container |
-
1988
- 1988-05-18 JP JP63120994A patent/JPH0657418B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021217224A1 (en) * | 2020-04-28 | 2021-11-04 | Albea Do Brasil Embalagens Ltda | Cap for a container |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0657418B2 (en) | 1994-08-03 |
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