JP5221417B2 - Needle pin for blow molding - Google Patents
Needle pin for blow molding Download PDFInfo
- Publication number
- JP5221417B2 JP5221417B2 JP2009046086A JP2009046086A JP5221417B2 JP 5221417 B2 JP5221417 B2 JP 5221417B2 JP 2009046086 A JP2009046086 A JP 2009046086A JP 2009046086 A JP2009046086 A JP 2009046086A JP 5221417 B2 JP5221417 B2 JP 5221417B2
- Authority
- JP
- Japan
- Prior art keywords
- tip
- side surfaces
- blow molding
- needle pin
- parison
- 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.)
- Active
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
本発明は、パリソンをブロー成形する際にパリソン内にガスを噴出するブロー成形用ニードルピンに関する。 The present invention relates to a needle pin for blow molding that blows gas into a parison when blow molding the parison.
樹脂製品のブロー成形では、溶融した熱可塑性樹脂を押し出して筒状或いは袋状をなすパリソンを成形し、このパリソンを金型のキャビティ内に閉じこめ、パリソンにニードルピンを突き刺し、ニードルピンに形成した噴出孔を介してエアを吹き込んで膨張、冷却させることによりパリソンを金型内壁に押圧して成形している。 In blow molding of resin products, a molten thermoplastic resin is extruded to form a cylindrical or bag-shaped parison, the parison is enclosed in a cavity of a mold, and a needle pin is inserted into the parison to form a needle pin. The parison is pressed against the inner wall of the mold by inflating and cooling by blowing air through the ejection holes.
上記のニードルピンの構造として、種々のものが提案されている。例えば、特許文献１には、図４に示すように、筒状をなすニードルピン本体の先端に取り付けられる針部の形状として、針部の中心を頂点として約３０°の角度で末広状の４つの斜面を形成し、隣接する斜面の稜線を刃とし、全体として傘形となるようにし、且つ前記斜面にエアの噴出口を開口せしめた構造が開示されている。 Various structures of the needle pin have been proposed. For example, in Patent Document 1, as shown in FIG. 4, the shape of a needle portion attached to the tip of a cylindrical needle pin main body is divergent 4 at an angle of about 30 ° with the center of the needle portion as a vertex. There is disclosed a structure in which two slopes are formed, an edge of an adjacent slope is used as a blade so as to form an umbrella shape as a whole, and an air outlet is opened on the slope.
特許文献２には、図５に示すように、内側を空気の吹き込み通路とし外側を排気通路とした２重管構造のニードルピンが開示されている。 Patent Document 2 discloses a double-pin needle pin having an air blowing passage on the inside and an exhaust passage on the outside as shown in FIG.
特許文献３には、図６（ａ）（ｂ）に示すように、中空状ブローピンの先端形状を斜めにカットするとともにエアの噴出通路を内部で曲げてピン側面に開口せしめ、更にカットした先端面を稜線を境にして左右の傾斜面に分割した構造が開示されている。 In Patent Document 3, as shown in FIGS. 6 (a) and 6 (b), the tip of the hollow blow pin is cut obliquely and the air ejection passage is bent inside to open to the side of the pin. A structure is disclosed in which a surface is divided into left and right inclined surfaces with a ridge line as a boundary.
特許文献１に開示されるニードルピンにあっては、刃が４箇所あるため、形状が複雑になり製作コストの面で、不利がある。また刃が４箇所あると斜面の頂点とピンの軸線とを一致させることが難しくなる。 In the needle pin disclosed in Patent Document 1, since there are four blades, the shape is complicated, which is disadvantageous in terms of manufacturing cost. Further, if there are four blades, it is difficult to match the apex of the slope with the axis of the pin.
特許文献２に開示される構造は、パイプの先端を斜めにカットすることで、ニードルの先端形状としている。しかしながら、パイプの先端を斜めにカットした場合、最初にパリソンに接触する先端箇所は丸まっており、ニードルをパリソンに押し当ててもパリソンが伸びるだけでパリソンを貫通しにくい事態が生じる。 In the structure disclosed in Patent Document 2, the tip of the needle is formed by cutting the tip of the pipe obliquely. However, when the tip of the pipe is cut obliquely, the tip portion that first contacts the parison is rounded, and even if the needle is pressed against the parison, the parison only extends and it is difficult to penetrate the parison.
特許文献３に開示される構造は、稜線は１つであるが、円柱の先端を斜めにカットした形状であるため、特許文献２と同様に最初にパリソンに接触する先端箇所が丸まってしまう。 Although the structure disclosed in Patent Document 3 has one ridge line, since the tip of the cylinder is cut obliquely, the tip portion that first contacts the parison is rounded similarly to Patent Document 2.
上記課題を解決するため、本発明に係るブロー成形用ニードルピンは、内部を気体の供給通路とした筒状本体と、この筒状本体の先端に交換可能に取り付けられるチップからなり、前記チップは板状で、チップの先部の形状は平面視で二等辺三角形をなし、上面よりも下面が前方にせり出し、前記上面と下面との間に左右の側面が設けられ、前記左右の側面の先端に形成される稜線、左右の側面と下面との境界に形成される稜線が刃となる構成とした。 In order to solve the above problems, a needle pin for blow molding according to the present invention comprises a cylindrical main body having a gas supply passage inside, and a tip that is replaceably attached to the tip of the cylindrical main body. The shape of the tip of the chip is an isosceles triangle in plan view, the lower surface protrudes forward from the upper surface, left and right side surfaces are provided between the upper surface and the lower surface, and the tips of the left and right side surfaces The ridgeline formed at the boundary between the left and right side surfaces and the lower surface is a blade.
前記左右の側面の先端に形成される稜線の傾斜角は２０〜４０°とし、前記左右の側面と下面との境界に形成される稜線の開き角は４０〜６０°とするのが好ましい。 It is preferable that the inclination angle of the ridge line formed at the tip of the left and right side surfaces is 20 to 40 °, and the opening angle of the ridge line formed at the boundary between the left and right side surfaces and the lower surface is 40 to 60 °.
本発明によれば、パリソンに当たるチップの形状が単純なため製作が容易で、しかもチップ先端が十分に尖っているためパリソンに確実に孔を開けることができ、更にチップが交換可能なため、コスト的に有利である。 According to the present invention, since the shape of the tip that hits the parison is simple, it is easy to manufacture, and since the tip of the tip is sufficiently sharp, it is possible to surely open a hole in the parison, and furthermore, the tip can be replaced, so that the cost can be reduced. Is advantageous.
以下に本発明の好適な実施例を添付図面に基づいて説明する。図１に示すように、ブロー成形用ニードルピンはホルダ１と筒状本体２が一体となった短管タイプまたはホルダ１と筒状本体２が別体となった多重管タイプであり、筒状本体２の先端にチップ３を着脱自在に取り付けている。 Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the needle pin for blow molding is a short tube type in which a holder 1 and a cylindrical main body 2 are integrated, or a multi-tube type in which the holder 1 and the cylindrical main body 2 are separated. A chip 3 is detachably attached to the tip of the main body 2.
筒状本体２は先端部の直前まで気体の供給路４が形成され、この供給路４にホルダ１を介して気体が供給され、供給された気体は筒状本体２の側面に形成された噴出口５からパリソン内に噴出する。 The cylindrical main body 2 has a gas supply path 4 formed immediately before the tip, and gas is supplied to the supply path 4 via the holder 1, and the supplied gas is a jet formed on the side surface of the cylindrical main body 2. From the exit 5 gushes into the parison.
筒状本体２の先端部には前記チップ３を装着するスリット６が形成され、このスリット６と直交する方向に貫通孔７が形成され、この貫通孔７には固定ピン８が挿入される。 A slit 6 for mounting the chip 3 is formed at the tip of the cylindrical main body 2, and a through hole 7 is formed in a direction perpendicular to the slit 6, and a fixing pin 8 is inserted into the through hole 7.
前記チップ３は板状をなし、前記スリット６に差し込まれるチップ３の基部には固定ピン８が挿通する孔９が形成され、またチップ３の先部の形状は平面視で二等辺三角形をなし、上面３ａよりも下面３ｂが前方にせり出し、前記上面３ａと下面３ｂとの間に左右の側面３ｃ、３ｄが設けられ、前記左右の側面３ｃ、３ｄの先端に形成される稜線１０、左右の側面３ｃ、３ｄと下面３ｂとの境界に形成される稜線１１，１１が刃となる。 The chip 3 has a plate shape, a hole 9 through which the fixing pin 8 is inserted is formed at the base of the chip 3 inserted into the slit 6, and the shape of the tip of the chip 3 is an isosceles triangle in plan view. The lower surface 3b protrudes forward from the upper surface 3a, and left and right side surfaces 3c and 3d are provided between the upper surface 3a and the lower surface 3b. The ridge line 10 formed at the tips of the left and right side surfaces 3c and 3d, Edge lines 11, 11 formed at the boundaries between the side surfaces 3c, 3d and the lower surface 3b are blades.
前記チップ３の稜線１０の傾斜角（チップ下面に対する角度）、および左右の稜線１１，１１のなす開き角について、実際のパリソンを用いて実験したところ、稜線１０の傾斜角については２０〜４０°が好ましく、稜線１１，１１のなす開き角については４０〜６０°が好ましいことが分かった。 When the inclination angle of the ridge line 10 of the chip 3 (angle with respect to the lower surface of the chip) and the opening angle formed by the left and right ridge lines 11 and 11 were tested using an actual parison, the inclination angle of the ridge line 10 was 20 to 40 °. It was found that the opening angle formed by the ridge lines 11 and 11 is preferably 40 to 60 °.
稜線１０の傾斜角が４０°を超えると、また稜線１１，１１の開き角が６０°を超えると、パリソンの延びが大きくなり、稜線１０の傾斜角が２０°より小さくなり、また稜線１１，１１の開き角が４０°より小さくなると、チップの強度不足を招き且つパリソンの一部が筒状本体２の先端に当たって延びる現象も発生した。したがって、上記の範囲が好ましい。 When the inclination angle of the ridge line 10 exceeds 40 ° and the opening angle of the ridge lines 11 and 11 exceeds 60 °, the extension of the parison becomes large, the inclination angle of the ridge line 10 becomes smaller than 20 °, and the ridge lines 11 and 11 When the opening angle of 11 was smaller than 40 °, a phenomenon that the strength of the chip was insufficient and part of the parison hit the tip of the cylindrical main body 2 also occurred. Therefore, the above range is preferable.
１…ホルダ、２…筒状本体、３…チップ、３ａ…チップの上面、３ｂ…チップの下面、３ｃ、３ｄ…チップの左右の側面、４…ガスの供給路、５…噴出口、６…スリット、７…貫通孔、８…固定ピン、９…抜け止めピンが挿通する孔、１０，１１…稜線。 DESCRIPTION OF SYMBOLS 1 ... Holder, 2 ... Cylindrical main body, 3 ... Chip, 3a ... Upper surface of chip, 3b ... Lower surface of chip, 3c, 3d ... Left and right side surfaces of chip, 4 ... Gas supply path, 5 ... Jet port, 6 ... Slit, 7 ... through hole, 8 ... fixing pin, 9 ... hole through which retaining pin is inserted, 10, 11 ... ridge line.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009046086A JP5221417B2 (en) | 2009-02-27 | 2009-02-27 | Needle pin for blow molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009046086A JP5221417B2 (en) | 2009-02-27 | 2009-02-27 | Needle pin for blow molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2010195020A JP2010195020A (en) | 2010-09-09 |
| JP5221417B2 true JP5221417B2 (en) | 2013-06-26 |
Family
ID=42820244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009046086A Active JP5221417B2 (en) | 2009-02-27 | 2009-02-27 | Needle pin for blow molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5221417B2 (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4922553Y1 (en) * | 1970-04-21 | 1974-06-17 | ||
| JPS57169510U (en) * | 1981-04-20 | 1982-10-25 | ||
| JPH0424328U (en) * | 1990-06-21 | 1992-02-27 | ||
| JP2556234B2 (en) * | 1992-02-04 | 1996-11-20 | 東洋製罐株式会社 | Blow air cylinder |
| JPH06182866A (en) * | 1992-12-21 | 1994-07-05 | Nippon Plast Co Ltd | Blow pin for molding hollow part |
| JPH0721331U (en) * | 1993-09-24 | 1995-04-18 | 日本プラスト株式会社 | Blow molding blow molding |
| JP3510034B2 (en) * | 1996-02-15 | 2004-03-22 | 日本ポリオレフィン株式会社 | Blow pin for blow molding and blow molding equipment |
| JP4202774B2 (en) * | 2003-01-21 | 2008-12-24 | 本田技研工業株式会社 | Blow molding equipment |
| JP4214018B2 (en) * | 2003-03-12 | 2009-01-28 | 八千代工業株式会社 | Blow needle |
-
2009
- 2009-02-27 JP JP2009046086A patent/JP5221417B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010195020A (en) | 2010-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20080290197A1 (en) | Spray nozzle | |
| JP2005515905A5 (en) | ||
| JP3648487B2 (en) | Nozzle tip for dispensing equipment | |
| CN104768619B (en) | Iron type golf club head | |
| JP6357082B2 (en) | Dental or surgical compressed air handpiece and turbine for the handpiece | |
| JP5221417B2 (en) | Needle pin for blow molding | |
| JP2008200429A (en) | Hood of hair dryer | |
| JP4731447B2 (en) | I. S. Extrusion mechanism for machine | |
| CN100493962C (en) | Air bag lid and its manufacture method | |
| CO5560088A1 (en) | BI-INJECTED TRIGGER PUMP SPRAYER | |
| JP4214018B2 (en) | Blow needle | |
| JP2009286462A (en) | Blow molded container | |
| JP6268741B2 (en) | Blow pin | |
| JP5375259B2 (en) | Blow molding product molding method and molding apparatus | |
| JP2009040443A (en) | Liquid container | |
| JP4202774B2 (en) | Blow molding equipment | |
| JP6706548B2 (en) | Defroster nozzle | |
| TWM592779U (en) | Badminton plastic pinaculum | |
| CN217008636U (en) | Whistle with large whistle | |
| JP4855295B2 (en) | Fountain pen nib | |
| KR200390550Y1 (en) | Ocarina | |
| JP5952160B2 (en) | Extruder die and extrusion molding machine | |
| JP4984494B2 (en) | Cone tip bit | |
| CN218700901U (en) | Injection mold insert | |
| JP6646419B2 (en) | Manufacturing method of drill bit and drill bit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20111124 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20120518 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20121213 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20121225 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20130128 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20130226 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20130307 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20160315 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5221417 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |