JP2752462B2 - Blow molding method for resin molded products - Google Patents
Blow molding method for resin molded productsInfo
- Publication number
- JP2752462B2 JP2752462B2 JP25599389A JP25599389A JP2752462B2 JP 2752462 B2 JP2752462 B2 JP 2752462B2 JP 25599389 A JP25599389 A JP 25599389A JP 25599389 A JP25599389 A JP 25599389A JP 2752462 B2 JP2752462 B2 JP 2752462B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- resin molded
- blow molding
- blow
- extruded
- 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 - Fee Related
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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4242—Means for deforming the parison prior to the blowing operation
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming 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、樹脂成形品のブロー成形方法の改良に関す
る。Description: TECHNICAL FIELD The present invention relates to an improvement in a blow molding method for a resin molded product.
（従来の技術） 従来より、三次元的に屈曲したプラスチック製曲管等
の樹脂成形品をブロー成形する方法として、例えば実公
昭60−27270号公報に開示されているように、金型を上
下方向および左右方向に移動させながら、押出機の押出
ヘッドから押し出されるパリソンを徐々に上記金型のキ
ャビティ形状に沿わせてキャビティ内に案内し、上記パ
リソン内に加圧気体を吹き込むことにより三次元的に屈
曲した樹脂成形品をブロー成形する方法が知られてい
る。2. Description of the Related Art Conventionally, as a method for blow molding a resin molded product such as a three-dimensionally bent plastic bent tube, for example, as disclosed in Japanese Utility Model Publication No. While moving in the left and right directions, the parison extruded from the extrusion head of the extruder is gradually guided along the cavity shape of the mold into the cavity, and three-dimensional by blowing a pressurized gas into the parison. 2. Description of the Related Art A method of blow-molding a resin molded product which is bent in a known manner is known.
ところで、樹脂成形品が三次元的に屈曲した複数の空
間部を有するものである場合、例えば三次元的に屈曲し
たフィラーパイプ本体に沿ってブリーザパイプやエバポ
パイプが付設されている自動車等車両用フィラーパイプ
である場合、該フィラーパイプを製作するには、まず、
フィラーパイプ本体、ブリーザパイプおよびエバポパイ
プを上記公報例の如き要領にてそれぞれ単独でブロー成
形し、次いで、上記フィラーパイプ本体に対しブリーザ
パイプおよびエバポパイプをブラケットを介して組み付
けるようになされている。By the way, when the resin molded product has a plurality of three-dimensionally bent space portions, for example, a filler for vehicles such as automobiles in which a breather pipe or an evaporative pipe is provided along a three-dimensionally bent filler pipe body. In the case of a pipe, to manufacture the filler pipe, first,
The filler pipe main body, the breather pipe and the evaporative pipe are blow-molded independently as described in the above-mentioned publication, and then the breather pipe and the evaporative pipe are assembled to the filler pipe main body via a bracket.
（発明が解決しようとする課題） しかし、上記のやり方では、フィラーパイプ本体、ブ
リーザパイプおよびエバポパイプをそれぞれ単独でブロ
ー成形したり、さらには、これらをブロー成形後に組み
付ける組付け工程が必要であることから、製作に手間取
りかつ製作時間が長くなるという問題があった。(Problems to be Solved by the Invention) However, in the above-described method, the filler pipe body, the breather pipe, and the evaporative pipe are each separately blow-molded, and further, an assembling step of assembling these after blow molding is required. Therefore, there is a problem that the production takes time and the production time becomes long.
本発明はかかる点に鑑みてなされたものであり、その
目的とするところは、上記のフィラーパイプ等のように
三次元的に屈曲した複数の空間部を有する樹脂成形品を
一度のブロー成形で即座に製作し得る適切な手段を講ず
ることにより、フィラーパイプ本体等の樹脂成形品構成
部材の単独ブロー成形や、ブロー成形後の組付け工程を
なくして、製作の容易化および製作時間の短縮化を図ら
んとすることにある。さらには、品質の優れた樹脂成形
品を得んとすることにある。The present invention has been made in view of such a point, and an object thereof is to blow-mold a resin molded product having a plurality of three-dimensionally bent space portions such as the above-described filler pipe in one blow molding. By taking appropriate measures that can be manufactured immediately, there is no need for individual blow molding of resin molded components such as the filler pipe body and the assembly process after blow molding, facilitating production and shortening production time. It is to aim at. Another object of the present invention is to obtain a high quality resin molded product.
（課題を解決するための手段） 上記の目的を達成するため、本発明の解決手段は、押
出機の押出ヘッドから押し出されるパリソンを金型のキ
ャビティ内に案内し、上記パリソン内に加圧気体を吹き
込むことにより、フィラーパイプ等のように三次元的に
屈曲した複数の空間部を有する樹脂成形品をブロー成形
する方法として、まず、内側パリソンと外側パリソンと
を所定間隔をあけて同心状に押し出す、次いで、この押
し出された内側および外側パリソンのパリソン空間に加
圧気体を吹き込んで所定のプリブロー圧をかけ、この状
態で、上記外側パリソンを外方より部分的に押圧して上
記内側パリソンに密着させる。その後、上記内側および
外側パリソンを金型のキャビティ内に案内し、上記パリ
ソン空間に加圧気体を吹き込むことにより、三次元的に
屈曲した複数の空間部を有する樹脂成形品をブロー成形
するようにする。(Means for Solving the Problems) In order to achieve the above object, a solution of the present invention is to guide a parison extruded from an extrusion head of an extruder into a cavity of a mold, and pressurized gas in the parison. As a method of blow molding a resin molded product having a plurality of three-dimensionally bent space portions such as a filler pipe by first blowing, an inner parison and an outer parison are concentrically spaced at a predetermined interval. Extruding, then applying a predetermined pre-blow pressure by blowing a pressurized gas into the extruded inner and outer parison spaces, and in this state, partially pressing the outer parison from the outside to the inner parison. Adhere. Thereafter, the inner and outer parisons are guided into a mold cavity, and a pressurized gas is blown into the parison space to blow-mold a resin molded product having a plurality of three-dimensionally bent space portions. I do.
（作用） 上記の構成により、本発明方法では、押出機の押出ヘ
ッドから内側パリソンと外側パリソンとが所定間隔をあ
けて同心状に押し出され、パリソン空間に加圧気体が吹
き込まれて所定のプリブロー圧がかけられる。そして、
この状態で、上記外側パリソンは外方より部分的に押圧
されて上記内側パリソンに密着させられた後、上記内側
および外側パリソンが金型のキャビティ内に案内され、
上記パリソン空間に加圧気体が吹き込まれることによ
り、フィラーパイプ等のように三次元的に屈曲した複数
の空間部を有する樹脂成形品がブロー成形される。(Operation) According to the above configuration, in the method of the present invention, the inner parison and the outer parison are concentrically extruded from the extrusion head of the extruder at a predetermined interval, and a pressurized gas is blown into the parison space to perform a predetermined pre-blow. Pressure is applied. And
In this state, after the outer parison is partially pressed from the outside and brought into close contact with the inner parison, the inner and outer parisons are guided into the mold cavity,
By blowing a pressurized gas into the parison space, a resin molded product having a plurality of three-dimensionally bent spaces, such as a filler pipe, is blow-molded.
このことから、上記三次元的に屈曲した複数の空間部
を有する樹脂成形品が一度のブロー成形で即座に製作さ
れ、よって樹脂成形品構成部材の単独ブロー成形や、ブ
ロー成形後の組付け工程がなくされて、製作の容易化お
よび製作時間の短縮化が図られることとなる。From this, the resin molded product having a plurality of three-dimensionally bent space portions is immediately produced by a single blow molding, so that the resin molded product component members can be individually blow-molded, and the assembling process after the blow molding. Is eliminated, and the production is facilitated and the production time is shortened.
さらには、押し出された同心状の内側および外側パリ
ソンのパリソン空間には、加圧気体が吹き込まれて所定
のプリブロー圧がかけられていることから、上記外側パ
リソンを外方より部分的に押圧した際における外側パリ
ソンの内側パリソンへの密着が回避され、よってパリソ
ン押出し時の形状変形が確実に防止されて品質の優れた
樹脂成形品が得られることとなる。Furthermore, since the pressurized gas is blown into the extruded concentric inner and outer parison spaces to apply a predetermined pre-blow pressure, the outer parison is partially pressed from the outside. At this time, the close contact of the outer parison with the inner parison is avoided, so that the shape deformation at the time of extruding the parison is reliably prevented, and a resin molded product having excellent quality can be obtained.
（実施例） 以下、本発明の実施例に係る樹脂成形品ブロー成形方
法を図面に基づいて説明する。(Example) Hereinafter, a resin molded product blow molding method according to an example of the present invention will be described with reference to the drawings.
第２図および第３図は本発明方法により得られた樹脂
成形品としての自動車等車両用フィラーパイプ１を示
す。該フィラーパイプ１は、略Ｌ字状の三次元的に屈曲
したフィラーパイプ本体２を備えてなり、該フィラーパ
イプ本体２の外周には、複数の空間部を構成するブリー
ザパイプ３とエバポパイプ4,4,4とがブロー成形により
一体的に形成されている。2 and 3 show a filler pipe 1 for a vehicle such as an automobile as a resin molded product obtained by the method of the present invention. The filler pipe 1 includes a substantially L-shaped three-dimensionally bent filler pipe body 2, and the outer periphery of the filler pipe body 2 has a breather pipe 3 and an evaporation pipe 4, which constitute a plurality of spaces. 4 and 4 are integrally formed by blow molding.
そして、このフィラーパイプ１をブロー成形する要領
を説明するに、まず、第１図（ａ）に示すように、例え
ば高密度ポリエチレン等の溶融樹脂を図示しない押出機
から押出ヘッド５に供給し、該押出ヘッド５から内側パ
リソンＡおよび外側パリソンＢとして所定間隔をあけて
同心状に押し出す。Then, to explain the procedure of blow molding the filler pipe 1, first, as shown in FIG. 1 (a), a molten resin such as high-density polyethylene is supplied to an extrusion head 5 from an extruder (not shown). The inner parison A and the outer parison B are concentrically extruded from the extrusion head 5 at predetermined intervals.
次いで、この押し出された内側および外側パリソンA,
Bのパリソン空間c1，c2に加圧気体を吹き込んで所定の
プリブロー圧をかけ、この状態で、第１図（ｂ）に示す
ように、上記外側パリソンＢを複数個（４個）の回動ロ
ーラ6,6,…でもって外方より部分的に押圧して上記内側
パリソンＡに密着させる。これにより、上記パリソン空
間c2を４つの独立したパリソン空間c3，c3，…に区画
し、内側パリソンＡつまりフィラーパイプ本体２の外周
に１つのブリーザパイプ３と、３つのエバポパイプ4,4,
…とを形成する。Then, the extruded inner and outer parisons A,
A predetermined pre-blow pressure is applied by blowing a pressurized gas into the parison spaces c 1 and c 2 of B, and in this state, as shown in FIG. With the rotating rollers 6, 6,..., They are partially pressed from the outside to make close contact with the inner parison A. Accordingly, the parison space c 2 four independent parison space c 3, c 3, partitioned ... in a single breather pipe 3 on the outer periphery of the inner parison A clogging filler pipe body 2, three Ebapopaipu 4,4 ,
... are formed.
その後、上記押出ヘッド５と図示しない金型とを相対
的に移動させることにより、上記内側および外側パリソ
ンA,Bを金型のキャビティ内に案内し、上記パリソン空
間c1および独立パリソン空間部c3，c3，…に加圧気体を
吹き込むことにより、三次元的に屈曲した複数の空間
部、つまり１つのブリーザパイプ３と３つのエバポパイ
プ4,4,4とを有するフィラーパイプ１をブロー成形す
る。Thereafter, the inner and outer parisons A and B are guided into the cavity of the mold by relatively moving the extrusion head 5 and a mold (not shown), and the parison space c 1 and the independent parison space c By blowing a pressurized gas into 3 , c 3 ,..., A filler pipe 1 having a plurality of three-dimensionally bent spaces, that is, one breather pipe 3 and three evaporative pipes 4, 4, 4 is blow-molded. I do.
したがって、上記三次元的に屈曲した複数の空間部
（ブリーザパイプ３およびエバポパイプ4,4,4）を有す
るフィラーパイプ１を一度のブロー成形で即座に製作し
得、これにより樹脂成形品構成部材としてのブリーザパ
イプ３およびエバポパイプ4,4,4の単独ブロー成形や、
ブロー成形後の組付け工程をなくして、製作の容易化お
よび製作時間の短縮化を図ることができる。Therefore, the filler pipe 1 having the three-dimensionally bent plural space portions (the breather pipe 3 and the evaporative pipes 4, 4, 4) can be immediately manufactured by a single blow molding, and as a result, as a resin molded product component member Blow molding of breather pipe 3 and evaporation pipe 4,4,4,
Eliminating the assembly process after blow molding makes it possible to facilitate the production and shorten the production time.
さらには、押し出された同心状の内側および外側パリ
ソンA,Bのパリソン空間c1，c2に加圧気体を吹き込んで
所定のプリブロー圧をかけていることから、上記外側パ
リソンＢを各回動ローラ６でもって外方より部分的に押
圧した際における外側パリソンＢの内側パリソンＡへの
密着を回避し得、これによりパリソン押出し時および脱
型時の形状変形を確実に防止して品質の優れたフィラー
パイプ１を得ることができる。Further, since the pressurized gas is blown into the parison spaces c 1 and c 2 of the extruded concentric inner and outer parisons A and B to apply a predetermined pre-blow pressure, the outer parison B is connected to each of the rotating rollers. 6 can avoid the close contact of the outer parison B with the inner parison A when the outer parison B is partially pressed from the outside, thereby reliably preventing the deformation of the shape of the parison during extrusion and demolding, and excellent quality. The filler pipe 1 can be obtained.
なお、上記実施例では、樹脂成形品が自動車等車両用
フィラーパイプ１である場合を示したが、これに限ら
ず、三次元的に屈曲した複数の空間部を有する樹脂成形
品であれば他のものにも適用可能である。In the above embodiment, the case where the resin molded product is the filler pipe 1 for a vehicle such as an automobile is shown. However, the present invention is not limited to this, and any other resin molded product having a plurality of three-dimensionally bent space portions may be used. Is also applicable.
（発明の効果） 以上説明したように、本発明方法によれば、押出機の
押出ヘッドから押し出される内側パリソンと外側パリソ
ンとを所定間隔をあけて同心状に押し出し、次いで、こ
の押し出された内側および外側パリソンのパリソン空間
に加圧気体を吹き込んで所定のプリブロー圧をかけ、こ
の状態で、上記外側パリソンを外方より部分的に押圧し
て上記内側パリソンに密着させた後、上記内側および外
側パリソンを金型のキャビティ内に案内し、内側パリソ
ン内および上記パリソン空間に加圧気体を吹き込むよう
にする。したがって、三次元的に屈曲した複数の空間部
を有する樹脂成形品を、樹脂成形品構成部材の単独ブロ
ー成形や、ブロー成形後の組付けを行うことなく一度の
ブロー成形で即座に製作し得、製作の容易化および製作
時間の短縮化を図ることができる。さらには、品質の優
れた樹脂成形品を得ることができる。(Effects of the Invention) As described above, according to the method of the present invention, the inner parison and the outer parison extruded from the extrusion head of the extruder are extruded concentrically at a predetermined interval, and then the extruded inner parison is extruded. A predetermined pre-blow pressure is applied by blowing a pressurized gas into the parison space of the outer parison and the outer parison, and in this state, the outer parison is partially pressed from the outside and brought into close contact with the inner parison, and then the inner and outer parisons are pressed. The parison is guided into the mold cavity, and pressurized gas is blown into the inner parison and into the parison space. Therefore, a resin molded product having a plurality of three-dimensionally bent space portions can be immediately manufactured by one blow molding without performing individual blow molding of the resin molded product constituent members or assembling after blow molding. In addition, it is possible to facilitate the production and shorten the production time. Further, a resin molded product having excellent quality can be obtained.
図面は本発明の実施例を示し、第１図（ａ）はパリソン
の押出し工程図、第１図（ｂ）は外側パリソンの内側パ
リソンへの密着工程図、第２図はフィラーパイプの斜視
図、第３図は同横断面図である。 １…フィラーパイプ（樹脂成形品） ５…押出ヘッド Ａ…内側パリソン Ｂ…外側パリソン c1，c2，c3…パリソン空間BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, wherein FIG. 1 (a) is a drawing of a process for extruding a parison, FIG. FIG. 3 is a cross-sectional view of the same. 1 ... filler pipe (resin molded article) 5 ... extrusion head A ... inner parison B ... outer parison c 1, c 2, c 3 ... parison space
Claims (1)
ソンを金型のキャビティ内に案内し、上記パリソン内に
加圧気体を吹き込むことにより、三次元的に屈曲した複
数の空間部を有する樹脂成形品をブロー成形する方法で
あって、内側パリソンと外側パリソンとを所定間隔をあ
けて同心状に押し出し、次いで、この押し出された内側
および外側パリソンのパリソン空間に加圧気体を吹き込
んで所定のプリブロー圧をかけ、この状態で、上記外側
パリソンを外方より部分的に押圧して上記内側パリソン
に密着させた後、上記内側および外側パリソンを金型の
キャビティ内に案内し、上記パリソン空間に加圧気体を
吹き込むことにより、三次元的に屈曲した複数の空間部
を有する樹脂成形品をブロー成形することを特徴とする
樹脂成形品のブロー成形方法。1. A resin molding having a plurality of three-dimensionally bent spaces by guiding a parison extruded from an extrusion head of an extruder into a cavity of a mold and blowing a pressurized gas into the parison. A method of blow molding a product, wherein an inner parison and an outer parison are extruded concentrically at a predetermined interval, and then a pressurized gas is blown into the extruded parison spaces of the inner and outer parisons to form a predetermined pre-blow. After applying pressure, the outer parison is partially pressed from the outside to make close contact with the inner parison, and then the inner and outer parisons are guided into a cavity of a mold and added to the parison space. Blowing a resin molded product having a plurality of three-dimensionally bent spaces by blowing a pressurized gas. Molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25599389A JP2752462B2 (en) | 1989-09-28 | 1989-09-28 | Blow molding method for resin molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25599389A JP2752462B2 (en) | 1989-09-28 | 1989-09-28 | Blow molding method for resin molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03114725A JPH03114725A (en) | 1991-05-15 |
| JP2752462B2 true JP2752462B2 (en) | 1998-05-18 |
Family
ID=17286412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25599389A Expired - Fee Related JP2752462B2 (en) | 1989-09-28 | 1989-09-28 | Blow molding method for resin molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2752462B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9539631B2 (en) * | 2013-09-13 | 2017-01-10 | Hanon Systems | Manufacturing process for tube-in-tube internal heat exchanger |
-
1989
- 1989-09-28 JP JP25599389A patent/JP2752462B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03114725A (en) | 1991-05-15 |
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