JPH0669715B2 - Blow molding method - Google Patents
Blow molding methodInfo
- Publication number
- JPH0669715B2 JPH0669715B2 JP59002664A JP266484A JPH0669715B2 JP H0669715 B2 JPH0669715 B2 JP H0669715B2 JP 59002664 A JP59002664 A JP 59002664A JP 266484 A JP266484 A JP 266484A JP H0669715 B2 JPH0669715 B2 JP H0669715B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- blow
- molding method
- blow molding
- molded product
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/24—Lining or labelling
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
- B29C2049/2017—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements outside the article
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 この発明はコーナ部を有する成形品を成形する場合に好
適するブロー成形法に関する。The present invention relates to a blow molding method suitable for molding a molded product having a corner portion.
射出ブロー成形法は、射出成形法によって密封パリソン
を成形したのち、このパリソンをブロー金型で囲繞し、
ついで、上記パリソンにエヤーを吹き込んでそのパリソ
ンを拡張させブロー金型の内周面に押し付けることによ
り成形品を成形するようになっている。In the injection blow molding method, after molding a sealed parison by the injection molding method, this parison is surrounded by a blow mold,
Next, air is blown into the parison to expand the parison and press it against the inner peripheral surface of the blow mold to form a molded product.
しかしながら、このブロー成形法は、ブロー金型の形状
によつてパリソンの拡張率が異なり、特に第１図に示す
ように、コーナ部ａを有する成形品ｂを成形する場合に
は、そのコーナ部ａにおけるパリソンｃの拡張率が他の
部分に比べて大きい。したがって、成形品ｂのコーナ部
ａが他の部分より薄肉となり、均一の肉厚の成形品を得
ることができないという欠点がある。However, in this blow molding method, the expansion ratio of the parison differs depending on the shape of the blow mold. Particularly, as shown in FIG. 1, when molding a molded product b having a corner part a, the corner part a The expansion rate of the parison c in a is larger than that in the other parts. Therefore, the corner portion a of the molded product b becomes thinner than the other portions, and it is not possible to obtain a molded product having a uniform thickness.
この発明は上記事情に着目してなされたもので、その目
的とするところは、ブロー金型のコーナ部に予め半熔融
状態の原料を挿入することにより、均一の肉厚の成形品
を得ることができるブロー成形法を提供しようとするも
のである。The present invention has been made in view of the above circumstances, and an object thereof is to obtain a molded product having a uniform thickness by inserting a semi-molten raw material into a corner portion of a blow mold in advance. It is intended to provide a blow molding method capable of
以下、この発明を図面に示す一実施例にもとづいて説明
する。Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
第２図中１は射出成形法によって成形されたパリソン
で、これはコア金型２に嵌合されている。３は分割可能
なブロー金型で、上記パリソン１を囲繞している。この
ブロー金型３の内周面にはコーナ部４が設けられてい
る。In FIG. 2, reference numeral 1 is a parison molded by an injection molding method, and this parison is fitted in a core mold 2. Reference numeral 3 is a blow mold that can be divided, and surrounds the parison 1. A corner portion 4 is provided on the inner peripheral surface of the blow mold 3.
しかして、上記ブロー金型３を用いてブロー成形する場
合には、第３図（Ａ）に示すようにブロー金型３のコー
ナ部４に半熔融状態の原料５を挿入する。この原料５は
上記パリソン１と同材料であり、その半熔融状態を維持
するためにブロー金型３のコーナ部４に発熱体を埋設し
てもよい。ついで、上記パリソン１を支持するコア金型
２のエヤー吹出口６からパリソン１内にエヤーを吹き込
むと、第３図（Ｂ）に示すようにパリソン１は拡張して
上記ブロー金型１の内周面に接合し、コーナ部４は原料
５に接合して一体となる。したがって、ブロー金型３の
内周面に均一の肉厚の成形品７が得られる。ブロー成形
後、冷却したのち上記ブロー金型１を型開きすると、成
形品７は取り出される。When performing blow molding using the blow mold 3, the semi-molten raw material 5 is inserted into the corner portion 4 of the blow mold 3 as shown in FIG. 3 (A). This raw material 5 is the same material as the parison 1, and a heating element may be embedded in the corner portion 4 of the blow mold 3 in order to maintain the semi-molten state. Then, when air is blown into the parison 1 from the air outlet 6 of the core mold 2 which supports the parison 1, the parison 1 expands as shown in FIG. The corner portion 4 is joined to the peripheral surface, and the corner portion 4 is joined to the raw material 5 to be integrated. Therefore, a molded product 7 having a uniform thickness can be obtained on the inner peripheral surface of the blow mold 3. After the blow molding, after cooling, the blow mold 1 is opened and the molded product 7 is taken out.
この場合、原料５はパリソン１と同材料でしかも半熔融
状態であるため、ブロー成形時の圧力によって一体とな
り、境目のない合成樹脂成形品が得られる。In this case, since the raw material 5 is the same material as the parison 1 and is in a semi-molten state, the raw material 5 is integrated by the pressure during blow molding, and a seamless synthetic resin molded product is obtained.
以上説明したように、この発明によれば、ブロー金型の
コーナ部に予め半熔融状態の原料を挿入し、ついでパリ
ソンをブロー成形することにより、コーナ部においても
他の部分と同一肉厚つまり、均一肉厚の成形品を得るこ
とができる。しかも、予め原料をコーナ部に挿入するだ
けであるから、成形工程が簡単で廉価にしかも品質の高
い成形品を得ることができるという効果を奏する。As described above, according to the present invention, the raw material in a semi-molten state is previously inserted into the corner portion of the blow mold, and then the parison is blow-molded, so that the corner portion has the same wall thickness as that of the other portions. A molded product having a uniform thickness can be obtained. Moreover, since the raw material is simply inserted into the corner portion in advance, the molding process is simple, and it is possible to obtain an inexpensive and high-quality molded product.
第１図は従来のブロー成形法を示す一部の断面図、第２
図はこの発明の一実施例を示すブロー成形原理図、第３
図（Ａ）（Ｂ）は同じくブロー成形工程を示す断面図で
ある。 １……パリソン、３……ブロー金型、４……コーナ部、
５……原料、７……成形品。FIG. 1 is a partial sectional view showing a conventional blow molding method, and FIG.
FIG. 3 is a blow molding principle diagram showing an embodiment of the present invention.
(A) and (B) are sectional views showing the same blow molding process. 1 ... Parison, 3 ... Blow mold, 4 ... Corner part,
5 ... Raw material, 7 ... Molded product.
Claims (1)
記パリソンにエヤーを吹き込んでパリソンを成形するブ
ロー成形法において、上記ブロー金型のコーナ部に予め
半溶融状態の原料を挿入し、ついで上記パリソンを成形
することを特徴とするブロー成形法。1. A blow molding method in which a parison is surrounded by a blow mold, and then air is blown into the parison to mold the parison, in which a semi-molten raw material is previously inserted into a corner portion of the blow mold. A blow molding method, which comprises molding the parison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59002664A JPH0669715B2 (en) | 1984-01-12 | 1984-01-12 | Blow molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59002664A JPH0669715B2 (en) | 1984-01-12 | 1984-01-12 | Blow molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60147320A JPS60147320A (en) | 1985-08-03 |
| JPH0669715B2 true JPH0669715B2 (en) | 1994-09-07 |
Family
ID=11535589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59002664A Expired - Lifetime JPH0669715B2 (en) | 1984-01-12 | 1984-01-12 | Blow molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0669715B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4236439A1 (en) * | 1992-10-28 | 1994-05-05 | Kautex Maschinenbau Gmbh | Method and device for producing hollow bodies from thermoplastic material |
-
1984
- 1984-01-12 JP JP59002664A patent/JPH0669715B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60147320A (en) | 1985-08-03 |
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