JPH09216277A - Blow pin for hollow molding, hollow molding apparatus and molding of hollow molded product - Google Patents

Blow pin for hollow molding, hollow molding apparatus and molding of hollow molded product

Info

Publication number
JPH09216277A
JPH09216277A JP8028316A JP2831696A JPH09216277A JP H09216277 A JPH09216277 A JP H09216277A JP 8028316 A JP8028316 A JP 8028316A JP 2831696 A JP2831696 A JP 2831696A JP H09216277 A JPH09216277 A JP H09216277A
Authority
JP
Japan
Prior art keywords
mold
molding
parison
gas
refrigerant
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
Application number
JP8028316A
Other languages
Japanese (ja)
Other versions
JP3510034B2 (en
Inventor
Kenji Hasegawa
建司 長谷川
Hidenori Ono
秀則 小野
Daizo Tabuchi
大三 田淵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON PORIOREFUIN KK
Japan Polyolefins Co Ltd
Original Assignee
NIPPON PORIOREFUIN KK
Japan Polyolefins Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIPPON PORIOREFUIN KK, Japan Polyolefins Co Ltd filed Critical NIPPON PORIOREFUIN KK
Priority to JP02831696A priority Critical patent/JP3510034B2/en
Publication of JPH09216277A publication Critical patent/JPH09216277A/en
Application granted granted Critical
Publication of JP3510034B2 publication Critical patent/JP3510034B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • B29C49/58—Blowing means
    • B29C49/60—Blow-needles
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/66—Cooling by refrigerant introduced into the blown article
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6604—Thermal conditioning of the blown article
    • B29C2049/6606—Cooling the article
    • B29C2049/6607—Flushing blown articles
    • B29C2049/6615—Flushing blown articles and exhausting through the blowing means

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a blow pin performing the jetting of at least one of gas and a cooling medium for shaping and cooling a parison and the discharge of the gas or cooling medium by one pin in the hollow molding of a synthetic resin and capable of performing the discharge of the gas or cooling medium simultaneously with cooling. SOLUTION: A blow pin for hollow molding is equipped with an inner cylindrical part A having a sharp leading end part and having a plurality of jet orifices jetting at least one of a cooling medium and gas formed in the vicinity of the leading end part thereof and the outer cylinder 23 coaxially provided outside the inner cylindrical part A so as to be relatively movable in the axial direction thereof. A gap 24 is provided between the outer cylinder 23 and the inner cylindrical part A and, when the outer cylinder 23 is relatively moved to an advance position so that the leading end thereof approaches the leading end of the inner cylindrical part A, the gap 24 is closed and, when the outer cylinder 23 is allowed to retreat from the advance position, the gap 24 communicates with a mold to become a cooling medium discharge passage.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、合成樹脂の中空成
形において成形品を冷却するための中空成形用吹込ピン
と中空成形装置並びに中空成形品の成形方法に関するも
ので、特に横吹き方式による中空成形において、成形品
を短時間に効率的に冷却しつつ、冷媒およびガスの噴射
と排出を１本のピンで行う中空成形用吹込ピンと中空成
形装置並びに中空成形品の成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding blow pin for cooling a molded product in hollow molding of a synthetic resin, a hollow molding device, and a method for molding a hollow molded product, and more particularly to a horizontal molding method. Relates to a blow molding pin for hollow molding, which blows and discharges a refrigerant and a gas with a single pin while efficiently cooling the molded article in a short time, a hollow molding apparatus, and a method for molding a hollow molded article.

【０００２】[0002]

【従来の技術】中空成形においては、成形品を冷却する
時間が成形サイクルの６０〜８０％を占めていた。した
がって近年成形品の大型化に伴い、この冷却時間の短縮
は、生産性の向上、生産コストの低減を行う上で重要な
課題となっており、種々の方法が考案されている。2. Description of the Related Art In blow molding, the time for cooling a molded product occupies 60 to 80% of the molding cycle. Therefore, with the increase in size of molded products in recent years, shortening the cooling time has become an important issue for improving productivity and reducing production cost, and various methods have been devised.

【０００３】例えば、特開昭６２−２１５２０号公報な
どには、パリソン上下より吹込ピンを挿入し、冷媒を中
空成形品に注入して成形する方法が開示されている。と
ころが、成形品の形状や用途によっては、吹込ピンをパ
リソン上下より挿入できない場合がある。このような場
合は金型の側壁から、パリソンに冷媒あるいは冷媒とガ
スを注入する注入ピンと、これらをパリソン外へ排出す
る排出ピンを突き刺して成形品内に冷媒およびガスを吹
き込む方法、いわゆる横吹き方式が採用される。For example, Japanese Unexamined Patent Publication No. 62-21520 discloses a method in which blow pins are inserted from above and below the parison and a refrigerant is injected into the hollow molded article for molding. However, depending on the shape and application of the molded product, the blow pin may not be inserted from above and below the parison. In such a case, the injection pin that injects the refrigerant or the refrigerant and gas into the parison from the side wall of the mold, and the ejection pin that ejects these to the outside of the parison are used to blow the refrigerant and gas into the molded product. The method is adopted.

【０００４】しかしながら、これらの方法では、成形品
に注入ピンと排出ピンの複数の孔が残るので、冷却後に
これらの孔を塞ぐ工程のための治具あるいは装置が必要
となり煩雑である。さらに孔塞ぎ工程により外観が損な
われたり、この孔を塞いだ部分の強度に対する信頼性が
損なわれる恐れがある。特に、自動車の燃料タンクなど
のような重要保安部品では、強度の信頼性が重要な問題
となる。However, in these methods, since a plurality of holes for the injection pin and the discharge pin remain in the molded product, a jig or device for the step of closing these holes after cooling is required, which is complicated. Further, the hole closing step may impair the external appearance and the reliability of the strength of the part that closes the hole. Particularly in important safety parts such as automobile fuel tanks, reliability of strength is an important issue.

【０００５】一方、特開平６−１８２８６６号公報に
は、冷媒の注入ピンと排出ピンを兼ねて１本の吹込ピン
で中空成形を行う方法が記載されている。ところが、こ
の吹込ピンは、ガス注入のための開口部から同時に冷媒
の排出を行うため、開口部の断面積が広く、冷媒を十分
に霧状にして噴霧することができない。したがって冷却
効果が不十分で、製品の良好な外観を得ることは困難で
あるという問題がある。さらにガスを注入し賦形が完了
するまで、冷媒排出をすることができず、冷媒またはガ
スの注入と排出を同時進行させることができず効率的で
ない。On the other hand, Japanese Unexamined Patent Publication No. 6-182866 discloses a method in which one blow pin doubles as a refrigerant injection pin and a discharge pin to perform hollow molding. However, since this blow-in pin discharges the refrigerant from the opening for gas injection at the same time, the cross-sectional area of the opening is large and the refrigerant cannot be atomized sufficiently to be sprayed. Therefore, there is a problem that the cooling effect is insufficient and it is difficult to obtain a good appearance of the product. Further, until the gas is injected and the shaping is completed, the refrigerant cannot be discharged, and the refrigerant and the gas cannot be injected and discharged at the same time, which is not efficient.

【０００６】[0006]

【発明が解決しようとする課題】本発明は前記事情に鑑
みてなされたもので、合成樹脂の中空成形において、パ
リソンの賦形のためのガスまたはガスと冷媒の噴射と、
この成形品の効率的な冷却のための冷媒または冷媒とガ
スの噴射と、このガスまたは冷媒の排出を１本のピンで
行うことが可能で、かつガスまたは冷媒の排出を上記冷
却と同時に行うことが可能な中空成形用吹込ピンと、こ
れを用いた中空成形装置並びに中空成形品の成形方法を
提供するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in blow molding of synthetic resin, injection of gas or gas and refrigerant for shaping the parison,
It is possible to inject the refrigerant or the refrigerant and the gas for efficient cooling of this molded product and to discharge the gas or the refrigerant with one pin, and to discharge the gas or the refrigerant at the same time as the cooling. (EN) A blow molding pin for blow molding, a blow molding apparatus using the blow pin, and a method for molding a blow molded product.

【０００７】[0007]

【課題を解決するための手段】本発明の中空成形用吹込
ピンは、金型内のパリソンに突き刺して該パリソン内に
冷媒とガスの少なくとも一方を噴出して該パリソンの賦
形および冷却を行う中空成形用吹込ピンであって、先端
部が鋭利で、該先端部の近傍に冷媒およびガスの少なく
とも一方を噴出する複数の噴射孔が形成された内筒部
と、該内筒部の外方に同軸にかつ軸方向に沿って相対移
動可能に設けられた外筒とを備え、該外筒と内筒部との
間に隙間を設け、上記外筒をその先端が内筒部先端に接
近した前進位置に相対移動させた時には該隙間が閉じら
れ、上記外筒を該前進位置より後退させた時には、該隙
間が金型内と連通して上記冷媒を排出する排出路となる
ように構成されたことを特徴としている。また本発明の
中空成形装置は、第一の金型と第二の金型から形成され
る分割金型と、この第一の金型に形成された貫通孔内に
挿入された上記中空成形用吹込ピンと、上記分割金型を
貫通孔軸方向に進退駆動させて上記中空成形用吹込ピン
の先端部を金型キャビティ面から突出または上記貫通孔
内に収納する第一の駆動手段と、上記内筒部を貫通孔軸
方向に進退駆動させて上記排出路を開閉する第二の駆動
手段を備えたことを特徴としている。また本発明の中空
成形品の成形方法は、金型のキャビティ面より１本の中
空成形用吹込ピンを賦形されるパリソンに突き刺し、上
記中空成形用吹込ピンより上記パリソン内にガスと霧状
化された冷媒を噴出して上記パリソンの賦形および冷却
を行いつつ、この噴出された冷媒の排出を上記中空成形
用吹込ピンを用いて上記冷却と同時に行うことを特徴と
している。上記パリソンの賦形をガスの噴出により行っ
てもよい。A blow molding pin for blow molding according to the present invention pierces a parison in a mold and ejects at least one of a refrigerant and a gas into the parison to shape and cool the parison. A blow molding pin for blow molding, the inner cylinder having a sharp tip and a plurality of injection holes for ejecting at least one of a refrigerant and a gas formed in the vicinity of the tip, and the outside of the inner cylinder. And an outer cylinder coaxially and relatively movable along the axial direction, a gap is provided between the outer cylinder and the inner cylinder, and the outer cylinder has its tip approaching the tip of the inner cylinder. When the outer cylinder is relatively moved to the forward position, the gap is closed, and when the outer cylinder is retracted from the forward position, the gap communicates with the inside of the mold to form a discharge path for discharging the refrigerant. It is characterized by being done. Further, the blow molding device of the present invention comprises a split mold formed of a first mold and a second mold, and the above-mentioned hollow molding inserted into a through hole formed in the first mold. A blow-in pin, a first drive means for driving the split mold forward and backward in the axial direction of the through-hole, and projecting the tip end of the blow-molding blow-in pin from the mold cavity surface or accommodating in the through-hole; It is characterized in that it is provided with a second drive means for driving the tubular portion forward and backward in the axial direction of the through hole to open and close the discharge passage. Further, the method for molding a hollow molded article of the present invention is such that one blow molding blow pin is pierced from the cavity surface of a mold into a parison to be shaped, and gas and mist are formed from the blow molding blow pin into the parison. It is characterized in that the atomized refrigerant is ejected to shape and cool the parison, and the ejected refrigerant is discharged simultaneously with the cooling using the blow molding blow pin. The parison may be shaped by ejecting gas.

【０００８】[0008]

【発明の実施の形態】図１ないし図３は本発明の中空成
形装置を示したものであり、第一の金型１と第二の金型
（図示せず）から形成される分割金型２と、この第一の
金型１に形成された貫通孔３内に挿入された中空成形用
吹込ピン４と、その分割金型２を前後方向に進退駆動さ
せる第一の駆動手段５，５と、内筒部を前後方向に進退
駆動させる第二の駆動手段６から概略構成されている。
上記分割金型２は、金属製に限られず、樹脂型でもよ
い。1 to 3 show a hollow molding apparatus of the present invention, which is a split mold formed from a first mold 1 and a second mold (not shown). 2, the hollow molding blow pin 4 inserted into the through hole 3 formed in the first mold 1, and the first driving means 5 and 5 for driving the divided mold 2 forward and backward. And a second drive means 6 for driving the inner cylinder part forward and backward.
The split mold 2 is not limited to being made of metal, and may be a resin mold.

【０００９】上記吹込ピン４は、内筒部Ａおよび外筒
（鞘体部）２３から構成されている。内筒部Ａは、パリ
ソン内部に突き刺され、霧状の冷媒とガスを噴射する部
分である噴射ノズル７と、冷媒とガスとを混合し霧状の
冷媒とするための混合ヘッド８と、この混合ヘッド８か
らの霧状の冷媒を同伴したスパイラルフローガスを噴射
ノズル７へ送る内筒９と、内筒先端に取り付けられるチ
ップ１３を、備えている。The blow-in pin 4 is composed of an inner cylinder portion A and an outer cylinder (sheath body portion) 23. The inner cylinder portion A is a portion that is pierced inside the parison and injects a mist-like refrigerant and a gas, a mixing head 8 for mixing the refrigerant and the gas into a mist-like refrigerant, and An inner cylinder 9 for sending a spiral flow gas accompanied by a mist-like refrigerant from the mixing head 8 to the injection nozzle 7 and a tip 13 attached to the tip of the inner cylinder are provided.

【００１０】図４ないし図６は本発明の中空成形用吹込
ピン４の先端部分を例示したものである。噴射ノズル７
は略円柱状のもので、後端側に段差部１１が形成され、
さらに段差部の中間より縮径部１２が形成されている。
そして、縮径部１２の先端部にはテーパが形成されて縮
径部１２の内壁先端が鋭利に切り出された形状となって
いる。そして、噴射ノズル７の先端には略円錐状で先端
が鋭利なチップ１３が取り付けられている。チップ１３
の先端の角度は片側４５゜以下の円錐形であり、好まし
くは片側３０゜以下の円錐形とすることが好ましい。4 to 6 exemplify the tip portion of the blow molding blow pin 4 of the present invention. Injection nozzle 7
Is a substantially cylindrical shape, and the step portion 11 is formed on the rear end side,
Further, a reduced diameter portion 12 is formed from the middle of the step portion.
A taper is formed at the tip of the reduced diameter portion 12 so that the tip of the inner wall of the reduced diameter portion 12 is sharply cut out. A tip 13 having a substantially conical shape and a sharp tip is attached to the tip of the injection nozzle 7. Chip 13
The tip has a conical shape with an angle of 45 ° or less on one side, preferably 30 ° or less on one side.

【００１１】チップ１３および噴射ノズル７には多数の
噴射孔１４…が形成されている。そして、チップ１３側
の噴射孔１４…は斜め前方に向けて開口し、内筒９側の
噴射孔１４…は斜め後方に向けて開口し、中間にある噴
射孔１４…は側方に向けて開口しており、これによって
霧状の冷媒とガスが放射状に噴射され、賦形後のパリソ
ン内面に、前後、左右、上下方向に直角あるいはそれに
近い角度で冷媒が当たるようになっている。噴射孔１４
…は、噴射ノズルの周囲に均等に形成された直径０．３
〜５ｍｍ、好ましくは０．５〜１ｍｍの孔であって、少
なくとも２個以上、好ましくは６個以上さらに好ましく
は多数形成されている。噴射孔１４…の直径が小さくて
個数が少ないと、噴射できる冷媒の量が少なく、効率的
な冷却をすることができないので好ましくない。A large number of injection holes 14 are formed in the tip 13 and the injection nozzle 7. The injection holes 14 on the side of the tip 13 are opened obliquely forward, the injection holes 14 on the side of the inner cylinder 9 are opened obliquely rearward, and the injection holes 14 in the middle are directed laterally. The opening is made so that mist-like refrigerant and gas are radially ejected, and the refrigerant is applied to the inner surface of the parison after shaping at right angles to the front-rear, left-right and up-down directions or at an angle close thereto. Injection hole 14
... is a diameter 0.3 evenly formed around the injection nozzle.
The holes are -5 mm, preferably 0.5-1 mm, and are formed at least 2 or more, preferably 6 or more, and more preferably a large number. If the diameter of the injection holes 14 ... Is small and the number thereof is small, the amount of the refrigerant that can be injected is small and efficient cooling cannot be achieved, which is not preferable.

【００１２】上記内筒９は、その先端部が噴射ノズルの
段差部１１および縮径部１２内壁面と嵌合し、基端部が
混合ヘッド８の接続孔（後述）に挿入して固着して設け
られており、こうして噴射ノズル７、内筒９、チップ１
３、および混合ヘッド８が内筒部Ａとして一体化されて
いる。The inner cylinder 9 has its front end fitted to the stepped portion 11 and the inner wall surface of the reduced diameter portion 12 of the injection nozzle, and the base end inserted into a connection hole (described later) of the mixing head 8 and fixed thereto. Are provided in this manner, and thus, the injection nozzle 7, the inner cylinder 9, and the tip 1
3, and the mixing head 8 are integrated as an inner cylinder portion A.

【００１３】上記第一の駆動手段５，５はシリンダー２
１，２１、第二の駆動手段はシリンダー２２を備えてい
る。そして第一の金型１にシリンダー２１，２１が接続
され、図１に示すようにシリンダー２１，２１が前進位
置にあるときは上記内筒部４は貫通孔３に収納され、図
２および図３に示すようにシリンダー２１，２１が後退
位置にあるときは、吹込ピン４の先端部が貫通孔３より
金型内部に向けて突出するようになっている。さらに混
合ヘッド８の基端部は、シリンダー２２に接続され、内
筒部Ａが一体となって前後方向に進退駆動されるように
なっている。The first driving means 5 and 5 are cylinders 2.
1, 21 and the second drive means include a cylinder 22. Then, the cylinders 21 and 21 are connected to the first mold 1, and when the cylinders 21 and 21 are at the forward position as shown in FIG. 1, the inner cylinder portion 4 is housed in the through hole 3, As shown in FIG. 3, when the cylinders 21 and 21 are in the retracted position, the tip of the blow pin 4 projects from the through hole 3 toward the inside of the mold. Further, the base end portion of the mixing head 8 is connected to the cylinder 22 so that the inner cylinder portion A is integrally driven to move forward and backward.

【００１４】上記内筒９の外側には、内筒９外周面を覆
うように外筒（鞘体部）２３が設けられており、内筒９
と外筒２３が、その間に排出路２４となる隙間を有する
２重筒状として移送パイプを構成している。さらに外筒
２３の基端部は支持体２６によって固定されている。そ
して、内筒部Ａが最後退位置にある図１および図２にお
いては、外筒２３先端部が噴射ノズル７の段差部１１に
当接して、排出路２４が閉鎖されており（図４および図
５）、図３に示すように、シリンダー２２により内筒部
Ａが前進位置にあるときは、外筒２３は支持体２６によ
り固定されているので、噴射ノズル７と外筒２３の間が
開口して、排出路２４先端が外部に連通される。さらに
排出路２４の基端部は支持体２６内に形成された空間部
２７に開口、連通しており、空間部２７には図示しない
排出管および排出ポンプが接続されて、排出路２４から
の冷媒および／またはガスの排出ができるようになって
いる。An outer cylinder (sheath body) 23 is provided outside the inner cylinder 9 so as to cover the outer peripheral surface of the inner cylinder 9.
The outer cylinder 23 and the outer cylinder 23 constitute a transfer pipe in the form of a double cylinder having a gap serving as the discharge path 24 therebetween. Further, the base end of the outer cylinder 23 is fixed by a support 26. 1 and 2 in which the inner cylinder portion A is in the rearmost retracted position, the tip end portion of the outer cylinder 23 abuts on the step portion 11 of the injection nozzle 7, and the discharge passage 24 is closed (see FIG. 4 and FIG. 4). As shown in FIG. 5 and FIG. 3, when the inner cylinder portion A is in the forward position by the cylinder 22, the outer cylinder 23 is fixed by the support member 26, so that the space between the injection nozzle 7 and the outer cylinder 23 is The opening opens and the tip of the discharge path 24 communicates with the outside. Further, the base end portion of the discharge passage 24 is opened and communicates with a space portion 27 formed in the support body 26, and a discharge pipe and a discharge pump (not shown) are connected to the space portion 27 so that the discharge passage 24 is discharged from the discharge passage 24. Refrigerant and / or gas can be discharged.

【００１５】そして排出路２４の開口状態（図３および
図６）から、シリンダー２２により内筒部Ａを後退させ
ると、外筒２３先端の内周面が、噴射ノズル７に形成さ
れた縮径部１２の外壁面を摺動した後、段差部１１に当
接して図２および図５に示すように、排出路２４を閉じ
ることができる。上述したように、縮径部１２の先端に
はテーパが形成され、かつ外筒２３先端部の端面は軸方
向に直交するように形成されているので、内筒部Ａの前
後移動による外筒２３先端の摩耗を減らすことができ、
吹込ピン４自身の耐久性を大幅に高めることができる。When the inner cylinder portion A is retracted by the cylinder 22 from the opened state of the discharge passage 24 (FIGS. 3 and 6), the inner peripheral surface of the tip of the outer cylinder 23 is reduced in diameter by the injection nozzle 7. After sliding on the outer wall surface of the portion 12, the discharge passage 24 can be closed by contacting the step portion 11 as shown in FIGS. 2 and 5. As described above, since the taper is formed at the tip of the reduced diameter portion 12 and the end surface of the tip end portion of the outer cylinder 23 is formed so as to be orthogonal to the axial direction, the outer cylinder caused by the forward and backward movement of the inner cylinder portion A. 23 The wear of the tip can be reduced,
The durability of the blow pin 4 itself can be greatly improved.

【００１６】上記混合ヘッド８は、混合リング２８、ガ
ス供給リング２９、冷媒供給リング３０、および接合リ
ング３１とから概略構成されている。混合リング２８は
金属製の中空円筒状のもので、その内部空間は３つに仕
切られ、後方から截頭円錐状とされた冷媒供給孔３２
と、中間の截頭円錐状とされた混合室３３と前方の円柱
状の接続孔３４とからなっている。上記冷媒供給孔３２
の太径部は、混合リング２８の後部に向けて開口し、細
径部は前方の混合室３３に臨んで開口している。また混
合室３３の太径部は冷媒供給孔３２に開口し、細径部は
前方の接続孔３４に開口している。The mixing head 8 is roughly composed of a mixing ring 28, a gas supply ring 29, a refrigerant supply ring 30, and a joining ring 31. The mixing ring 28 is made of metal and has a hollow cylindrical shape. The internal space of the mixing ring 28 is divided into three parts.
And a mixing chamber 33 having a truncated cone shape in the middle and a cylindrical connecting hole 34 in the front. The refrigerant supply hole 32
The large-diameter portion is open toward the rear of the mixing ring 28, and the small-diameter portion is open toward the front mixing chamber 33. The large diameter portion of the mixing chamber 33 is opened to the refrigerant supply hole 32, and the small diameter portion is opened to the front connection hole 34.

【００１７】冷媒供給孔３２の細径部の内径は、混合室
３３の太径部の内径よりも小さくなっており、これによ
り冷媒供給孔３２と混合室との間には平坦な段差部３５
が形成されている。また混合室３３の細孔部の内径は接
続孔３４の内径よりも小さくされ、同様に段差部３６が
形成されている。接続孔３４には、内筒９の一端が挿入
され、その先端部が上記段差部３６に当接された状態で
接続孔３４に内筒９の一端がロウ付け、溶接などによっ
て固着されている。The inner diameter of the small diameter portion of the refrigerant supply hole 32 is smaller than the inner diameter of the large diameter portion of the mixing chamber 33, whereby a flat step portion 35 is formed between the refrigerant supply hole 32 and the mixing chamber.
Are formed. Further, the inner diameter of the pore portion of the mixing chamber 33 is made smaller than the inner diameter of the connection hole 34, and the step portion 36 is similarly formed. One end of the inner cylinder 9 is inserted into the connection hole 34, and one end of the inner cylinder 9 is fixed to the connection hole 34 by brazing, welding or the like in a state where the end portion of the inner cylinder 9 is in contact with the step portion 36. .

【００１８】また混合リング２８の冷媒供給孔３２の周
方向の外方には中空管状のマニホールド３７が形成さ
れ、このマニホールド３７からは図に示すように複数の
ガス吹出孔３８…が上記段差部に開口するように形成さ
れている。ガス吹出孔３８…は、円周上等間隔に２〜１
０個形成されているとともに、各吹出孔３８…の中心軸
が混合リングの中心軸上の１点に集束するように、混合
リングの中心軸に対して傾斜するとともに、円周方向に
も傾斜するように形成されている。A hollow tubular manifold 37 is formed outside the refrigerant supply hole 32 of the mixing ring 28 in the circumferential direction. From the manifold 37, a plurality of gas outlets 38 ... It is formed so as to open. The gas outlets 38 ... Are 2-1 at equal intervals on the circumference.
0 is formed, and is inclined with respect to the central axis of the mixing ring so that the central axis of each of the blowout holes 38 is focused on one point on the central axis of the mixing ring, and is also inclined in the circumferential direction. Is formed.

【００１９】また混合リング２８の冷媒供給孔３２の後
側には、図１ないし図３に示すように接合リング３１が
回転自在に嵌め込まれ、この接合リング３１には冷媒供
給リング３０が接続されており、冷媒供給リング３０に
は図示しない冷媒供給源および冷媒供給パイプが接続さ
れ、加圧状態の冷媒が冷媒供給孔３２に送り込まれるよ
うになっている。A joint ring 31 is rotatably fitted to the rear side of the refrigerant supply hole 32 of the mixing ring 28 as shown in FIGS. 1 to 3, and the joint ring 31 is connected to the refrigerant supply ring 30. A refrigerant supply source and a refrigerant supply pipe (not shown) are connected to the refrigerant supply ring 30 so that the pressurized refrigerant is fed into the refrigerant supply hole 32.

【００２０】ガス供給リング２９は混合リング２８の外
周に回動自在に嵌め合わせられた金属製の略円筒状のも
ので、その側部にガス供給パイプ３９が一体に設けられ
ている。このガス供給パイプ３９の基端部は、混合リン
グ２８に形成されたマニホールド３７に開口、連通して
おり、このガス供給パイプ３９に供給された加圧状態の
ガスがマニホールド３７を経てガス吹出孔３８…から噴
射するようになっている。またガス供給パイプ３９には
図示しないガスホースが接続され、加圧ガスが送り込ま
れるようになっている。The gas supply ring 29 is a substantially cylindrical metal-made member which is rotatably fitted to the outer circumference of the mixing ring 28, and a gas supply pipe 39 is integrally provided on the side portion thereof. The base end portion of the gas supply pipe 39 is opened and communicates with a manifold 37 formed in the mixing ring 28, and the pressurized gas supplied to the gas supply pipe 39 passes through the manifold 37 and blows out gas. It is designed to jet from 38 ... Further, a gas hose (not shown) is connected to the gas supply pipe 39 so that the pressurized gas is fed.

【００２１】かかる構成の混合ヘッド８により、大量の
冷媒を霧状にし、スパイラルフローのガスに同伴させ
て、移送パイプを経て噴射孔１４…より高速でパリソン
内に放射状に噴射することができるので、成形品を極め
て効率よく、短時間で冷却でき、成形品の冷却時間を大
幅に短縮できる。また成形品全体が均一かつ急速に冷却
されるので成形品の内面の光沢が良好となり、しかも寸
法安定性も良好なものとなる。With the mixing head 8 having such a structure, a large amount of refrigerant can be atomized and carried along with the spiral flow gas, and can be radially injected into the parison at a higher speed than the injection holes 14 through the transfer pipe. The molded product can be cooled very efficiently in a short time, and the cooling time of the molded product can be significantly shortened. Further, since the entire molded product is cooled uniformly and rapidly, the gloss of the inner surface of the molded product becomes good, and the dimensional stability becomes good.

【００２２】次に、上記中空成形装置を用いて、本発明
の中空成形品の成形法の一例を説明する。本発明の中空
成形品の成形方法に用いる樹脂は、熱可塑性樹脂である
ことが好ましく、例えば、ポリオレフィン、ポリスチレ
ン、ポリ塩化ビニル、アクリル樹脂、ポリアミド、ポリ
エステル、ポリウレタンなどがあげられる。また、この
ポリオレフィンの例としては、プロピレン単独重合体、
プロピレン−α−オレフィンランダム共重合体、プロピ
レン−α−オレフィンブロック共重合体、高密度ポリエ
チレン、中密度ポリエチレン、低密度ポリエチレン（例
えば線状低密度ポリエチレンや分岐状低密度ポリエチレ
ンなど）、エチレンとα−オレフィン（例えばプロピレ
ン、ブテン−１、ペンテン−１、ヘキセン−１など）ま
たは他のコモノマー（例えば酢酸ビニル、無水マレイン
酸など）の１種類以上とを共重合させたものなどが挙げ
られる。Next, an example of a method for molding a hollow molded article of the present invention using the above hollow molding apparatus will be described. The resin used in the method for molding the hollow molded article of the present invention is preferably a thermoplastic resin, and examples thereof include polyolefin, polystyrene, polyvinyl chloride, acrylic resin, polyamide, polyester, polyurethane and the like. Further, as an example of this polyolefin, propylene homopolymer,
Propylene-α-olefin random copolymer, propylene-α-olefin block copolymer, high-density polyethylene, medium-density polyethylene, low-density polyethylene (for example, linear low-density polyethylene or branched low-density polyethylene), ethylene and α -Olefins (e.g. propylene, butene-1, pentene-1, hexene-1 etc.) or copolymers with one or more other comonomers (e.g. vinyl acetate, maleic anhydride etc.) and the like can be mentioned.

【００２３】上述の樹脂は、１種類あるいは、２種類以
上を混合して用いることができる。また、必要に応じ
て、エチレン−プロピレン共重合体エラストマー、エチ
レン−プロピレン−ジエン共重合体エラストマーなどを
混合して用いてもよい。また、無機物、結晶核剤、安定
剤、難燃化剤、加工性改良剤、滑剤、帯電防止剤、酸化
防止剤、紫外線吸収剤、着色剤、顔料などの添加剤を、
その目的によって添加したものを用いることもできる。The above resins may be used alone or in combination of two or more. Moreover, you may mix and use an ethylene-propylene copolymer elastomer, an ethylene-propylene-diene copolymer elastomer, etc. as needed. In addition, additives such as inorganic substances, crystal nucleating agents, stabilizers, flame retardants, processability improvers, lubricants, antistatic agents, antioxidants, ultraviolet absorbers, colorants, pigments, etc.
The one added depending on the purpose can also be used.

【００２４】本発明の成形方法を実施するにあたって
は、まず、第一の金型１と第二の金型は開いた状態とし
て、図１に示すように第一の金型１に設けられた中空成
形用吹込ピン４を後退させておき、その先端が金型キャ
ビティ面内部より突出しないようにしておく。つぎに、
加熱して溶融した樹脂を、押出機によって、中空成形ダ
イコア（図示せず）よりチューブ状に押し出してパリソ
ン（図示せず）とし、このパリソン内部に空気を閉じこ
めるようにして、プリピンチ板（図示せず）によってそ
の端を封止する。このパリソンの端を封止するのは、こ
のパリソンが、第一の金型１と第二の金型のキャビティ
面に軽く接することができる程度の空気が、このパリソ
ン内部に閉じこめられる状態であれば、パリソンが中空
成形ダイコアより１ショット押し出された後でもよい
し、その１部分が押し出されたときでもよい。In carrying out the molding method of the present invention, first, the first mold 1 and the second mold 1 are provided in the opened state in the first mold 1 as shown in FIG. The blow molding blow pin 4 is retracted so that its tip does not protrude from the inside of the mold cavity surface. Next,
The resin melted by heating is extruded into a parison (not shown) from a hollow molding die core (not shown) by an extruder, and air is trapped inside the parison, and a pre-pinch plate (not shown) is provided. The end is sealed by (No.). The end of the parison is sealed only when the parison is confined with air that allows the parison to lightly contact the cavity surfaces of the first mold 1 and the second mold. For example, the parison may be extruded from the hollow molding die core for one shot, or may be extruded at a part thereof.

【００２５】また、パリソンとしては、以下のようなも
のを用いることもできる。すなわち、この中空成形品の
成形前に、樹脂を長尺のパイプ状に押出成形によって成
形し、これを所定の寸法に切断し、再加熱して分割金型
２に挟んでパリソンとすることもできる。また、射出成
形などの他の成形方法によって形成したパリソンを用い
ることもできるし、２枚の加熱されたシートを分割金型
２に挟むことによってパリソンとすることもできる。ま
た、パリソン作成前の樹脂の溶融温度や、パリソン作成
時の温度、および、次の段階である、このパリソン内部
に成形用ガスを吹き込むときの、このパリソンの温度
は、樹脂の種類や、成形条件などに応じて、適宜に設定
することができる。As the parison, the following can also be used. That is, before molding this hollow molded product, a resin may be molded into a long pipe by extrusion molding, cut into a predetermined size, reheated, and sandwiched in the split mold 2 to form a parison. it can. Further, a parison formed by another molding method such as injection molding can be used, or a parison can be formed by sandwiching two heated sheets in the split mold 2. Also, the melting temperature of the resin before making the parison, the temperature when making the parison, and the temperature of this parison when the molding gas is blown into the parison, which is the next stage, is the type of resin, the molding It can be appropriately set according to the conditions.

【００２６】この後、第一の金型１と第二の金型を閉め
始める。このとき、前記パリソン内部に閉じこめられた
空気によって、パリソン外部は、金型キャビティ面内部
に軽く接触した状態となる。この第一の金型１と第二の
金型が完全に閉じた状態になる前に、シリンダー２１，
２１を図２に示す位置まで後退させ、排出路２４を閉じ
た状態で、内筒部Ａおよび外筒２３の先端部を金型キャ
ビティ面より突出させて、パリソンに突き刺す。After that, the first mold 1 and the second mold are closed. At this time, the air trapped inside the parison causes the outside of the parison to be in light contact with the inside of the mold cavity surface. Before the first mold 1 and the second mold are completely closed, the cylinder 21,
2 is retracted to the position shown in FIG. 2 and the end portions of the inner cylinder portion A and the outer cylinder 23 are projected from the mold cavity surface and the parison is pierced while the discharge passage 24 is closed.

【００２７】ここで、ガス供給リングのガス供給パイプ
に２〜１０ｋｇｆ／ｃｍ2、好ましくは５〜７ｋｇｆ／
ｃｍ2の圧力で、ガスを供給しつつ、前記第一の金型１
と前記第二の金型を閉め、このパリソンを賦形する。２
kgf/cm2未満であると、このガスの導入によるパリソン
の賦形に時間がかかるのに加えて、製造される中空成形
品の外観不良が発生することがある。また、１０kgf/cm
2を越えると、前記パリソンが破れてしまったり、前記
分割金型２の締め付け圧力を高くしなければならないた
め、装置的な改良を必要としたりする場合があり、好ま
しくない。上記ガスとしては、任意のものを用いること
ができるが、コストが安く、入手が容易であることから
空気を用いることが一般的である。In the gas supply pipe of the gas supply ring, 2 to 10 kgf / cm 2 , preferably 5 to 7 kgf / cm 2 .
The first mold 1 is supplied with gas at a pressure of cm 2.
And the second mold is closed, and this parison is shaped. 2
When it is less than kgf / cm 2, it takes time to shape the parison due to the introduction of this gas, and in addition, the appearance of the hollow molded article produced may be poor. Also, 10 kgf / cm
If it exceeds 2 , the parison may be broken or the tightening pressure of the split mold 2 needs to be increased, which may necessitate improvement in the apparatus, which is not preferable. Although any gas can be used as the gas, air is generally used because it is inexpensive and easily available.

【００２８】上記ガスの吹き込み速度は、中空成形品の
大きさによって、任意に設定することができる。また、
このガスの吹き込みによって行われる賦形の時間や、こ
のガスの温度は、成形する中空成形品などによって任意
に設定することができる。また、上述のガスの導入を行
う際の分割金型２の温度は、任意に設定することでき
る。The gas blowing speed can be arbitrarily set according to the size of the hollow molded product. Also,
The shaping time performed by blowing the gas and the temperature of the gas can be arbitrarily set depending on the hollow molded article to be molded. Moreover, the temperature of the split mold 2 when introducing the above-mentioned gas can be set arbitrarily.

【００２９】供給されたガスはマニホールド３７を経
て、複数のガス吹出孔３８…から混合室３２に高速で吹
き込まれるが、ガス吹出孔３８…の方向が上述のように
混合リングの中心軸上の１点に集束するように傾斜し、
かつ円周方向にも傾斜しているので、混合室に吹き込ま
れたガスは、図７に示すように、高速のらせん状のスパ
イラルフロー４１となり、移送パイプを経て噴射ノズル
に運ばれる。噴射ノズルでは多数の噴射孔が斜め前方、
側方、および斜め後方に開口しているため、ガスが噴射
孔１４…から放射状にかつ全方向に均一に噴射される。
こうして、パリソンが金型の内面に接するまで賦形する
（賦形工程）。The supplied gas is blown into the mixing chamber 32 through the manifold 37 at a high speed from a plurality of gas outlets 38. The direction of the gas outlets 38 is on the central axis of the mixing ring as described above. Tilt to focus on one point,
Moreover, since it is also inclined in the circumferential direction, the gas blown into the mixing chamber becomes a high-speed spiral flow 41 as shown in FIG. 7, and is conveyed to the injection nozzle via the transfer pipe. In the injection nozzle, many injection holes are diagonally forward,
Since the gas is opened laterally and obliquely rearward, the gas is radially and uniformly ejected from the ejection holes 14 in all directions.
In this way, the parison is shaped until it contacts the inner surface of the mold (forming step).

【００３０】賦形工程の時間は、所望の時間に随時変更
することができる。あるいは、この賦形工程を、以下の
冷却工程を兼ねて、冷媒を同伴したガスを噴射すること
により行うこともできる。パリソンが金型の内面に接す
るまでは、図７に示すように、外筒２３と内筒９との間
の排出路２４を閉じた状態で賦形を行うことが好まし
い。賦形工程において、排出路２４を開放状態にする
と、外筒２３と内筒９の間にパリソンが入り込む恐れが
あり好ましくない。The time of the shaping step can be changed to a desired time at any time. Alternatively, this shaping step can also be performed by injecting a gas accompanied by a refrigerant, which also serves as the following cooling step. Until the parison is in contact with the inner surface of the mold, it is preferable to perform shaping with the discharge passage 24 between the outer cylinder 23 and the inner cylinder 9 closed as shown in FIG. 7. If the discharge path 24 is opened in the shaping step, the parison may enter between the outer cylinder 23 and the inner cylinder 9, which is not preferable.

【００３１】賦形終了後、図３に示すようにシリンダー
６を前進させ、内筒部Ａをさらに刺し込んで、外筒２３
との間の排出路２４が開口する。この状態で、混合リン
グの冷媒供給孔に冷媒を、ガス供給リング２９のガス供
給パイプ３９に空気などのガスをそれぞれ供給する。こ
こで冷媒およびガスの圧力は、パリソン内部の圧力より
も０．５〜９ｋｇｆ／ｃｍ2、好ましくは０．５〜６ｋ
ｇｆ／ｃｍ2高くすることが好ましい。冷媒は先細りの
冷媒供給孔３２を進むにつれてその流速が増大して混合
室３３に高速で進入する。混合室では上述のごごとく高
速のスパイラルフローガスが発生しており、このスパイ
ラルフローガスと高速の冷媒とが激しく攪拌、混合さ
れ、冷媒は霧化され、図８に示すように、霧状の冷媒４
２がスパイラルフローガス４１に同伴されて移送パイプ
に送られ噴射ノズルに運ばれ、霧状の冷媒とガスが噴射
孔１４…から放射状にかつ全方向に均一に噴射される。
上記冷媒としては例えば水、液化窒素、液化炭酸ガス、
各種有機溶媒などがあげられるが、水を用いることが好
ましい。水を用いるとその比熱により高い冷却効果が得
られ、成形される中空成形品の収縮率が小さくなり、ま
たコストを低くおさえることができる。このようにして
霧状の冷媒は成形品の内面全体に均一に当たり成形品を
短時間で冷却することができる（冷却工程）。After shaping, the cylinder 6 is advanced as shown in FIG.
The discharge path 24 between and opens. In this state, the refrigerant is supplied to the refrigerant supply hole of the mixing ring and the gas such as air is supplied to the gas supply pipe 39 of the gas supply ring 29. Here, the pressure of the refrigerant and the gas is 0.5 to 9 kgf / cm 2 , preferably 0.5 to 6 k, higher than the pressure inside the parison.
It is preferable to increase gf / cm 2 . The flow velocity of the refrigerant increases as it advances through the tapered refrigerant supply hole 32, and enters the mixing chamber 33 at high speed. In the mixing chamber, the high-speed spiral flow gas as described above is generated, and the spiral flow gas and the high-speed refrigerant are vigorously stirred and mixed, and the refrigerant is atomized, and as shown in FIG. Refrigerant 4
2 is entrained in the spiral flow gas 41, sent to the transfer pipe and carried to the injection nozzle, and atomized refrigerant and gas are radially and uniformly ejected from the injection holes 14 in all directions.
Examples of the refrigerant include water, liquefied nitrogen, liquefied carbon dioxide,
Although various organic solvents can be used, it is preferable to use water. When water is used, a high cooling effect is obtained due to its specific heat, the shrinkage rate of the hollow molded article to be molded becomes small, and the cost can be kept low. In this way, the atomized refrigerant uniformly hits the entire inner surface of the molded product, and the molded product can be cooled in a short time (cooling step).

【００３２】そして冷却工程と同時に、空間部２７に排
出管を介して接続された減圧弁を通して、排出路からの
冷媒の排水、ガスの排気を行う。ここで排出圧力は、
０．５〜５．９ｋｇ／ｃｍ2、好ましくは２．０〜４．
０ｋｇ／ｃｍ2とする。この排出圧力は低すぎると、内
圧が低い場合と同様に製品肌が悪くなり、高すぎると水
とガスの混合物の投入量が少なくなり効果が悪くなるの
で、好ましくない。Simultaneously with the cooling process, the refrigerant is discharged from the discharge passage and the gas is discharged through the pressure reducing valve connected to the space 27 via the discharge pipe. Here, the discharge pressure is
0.5 to 5.9 kg / cm 2 , preferably 2.0 to 4.
It is set to 0 kg / cm 2 . If the discharge pressure is too low, the product surface will be deteriorated as in the case where the internal pressure is low, and if it is too high, the amount of the mixture of water and gas will be reduced and the effect will be deteriorated.

【００３３】このパリソン内部に導入する冷媒とガスの
温度は、目的によって任意に設定することができるが、
上述の成形ガスの導入時のパリソン６の温度よりも低く
する必要がある。特にこの冷媒の温度は、０〜２０℃と
すると好ましい。また、その導入速度は、製造する中空
成形品の大きさなどによって任意に設定することができ
る。この冷媒とガスの導入時の前記分割金型２の温度
は、任意に設定することができ、必要があればこの分割
金型２外部を冷却水によって冷却して用いてもよい。The temperature of the refrigerant and gas introduced into the parison can be set arbitrarily according to the purpose.
It is necessary to make the temperature lower than the temperature of the parison 6 when the molding gas is introduced. Particularly, the temperature of this refrigerant is preferably 0 to 20 ° C. Further, the introduction speed can be arbitrarily set depending on the size of the hollow molded product to be manufactured. The temperature of the split mold 2 at the time of introducing the refrigerant and gas can be set arbitrarily, and if necessary, the outside of the split mold 2 may be cooled with cooling water before use.

【００３４】成形品の冷却が完了した後、シリンダー２
２を後退させるとともにシリンダー２１，２１を前進さ
せて、吹込ピン４を図１の状態とした後、金型を開き成
形品を取り出す。上述のパリソンの冷却後、パリソンを
分割金型２より取り出す温度は、目的に応じて、任意に
設定することができる。After cooling the molded product, the cylinder 2
2 is moved backward and the cylinders 21 and 21 are moved forward to bring the blow-in pin 4 into the state shown in FIG. 1, then the mold is opened and the molded product is taken out. After the parison is cooled, the temperature at which the parison is taken out from the split mold 2 can be set arbitrarily according to the purpose.

【００３５】前記パリソン内部に中空成形用吹込ピン４
によって冷媒とガスとを導入する場合、この冷却に用い
るガスは、必ずしも必須ではなく、冷媒のみを前記パリ
ソン内部に導入して、このパリソン内部よりパリソンを
冷却することもできる。しかし、ガスを導入することに
より、冷媒を霧状にしてを放出することができ、均一な
冷却が行われるので、冷媒とガスとを導入する方が好ま
しい。また、この冷媒、あるいは冷媒およびガスの導入
の際に、この冷媒とともに、例えば氷のような冷媒の凝
固物を導入すると、冷却効率が高まるという効果が得ら
れる。The blow pin 4 for hollow molding is provided inside the parison.
When the refrigerant and the gas are introduced by means of the above, the gas used for the cooling is not always essential, and it is also possible to introduce only the refrigerant into the parison and cool the parison from the inside of the parison. However, by introducing the gas, the refrigerant can be atomized and released, and uniform cooling is performed. Therefore, it is preferable to introduce the refrigerant and the gas. Further, when this refrigerant, or a refrigerant and a gas, is introduced with a solidified product of a refrigerant such as ice together with the refrigerant, an effect of enhancing cooling efficiency can be obtained.

【００３６】また、必要に応じて、中空成形品表面に張
り付ける材料を、この中空成形品の成形時、パリソン外
部と第一の金型１または第二の金型のどちらか一方との
間、または第一の金型１および第二の金型の間に挿入し
て、一度にこの材料を張り付けて、中空成形品の成形を
行うこともできる。このような材料を用いた場合は、前
記パリソン外部は、この材料を介して第一の金型１また
は第二の金型、または第一の金型１および第二の金型に
接することになるが、このこと以外は、上述の方法と同
様にして中空成形を行うことができる。このとき、上述
の材料と、前記パリソンおよび第一の金型１または第二
の金型、または第一の金型１および第二の金型とが接し
た状態となってから、上述の冷媒とガスの導入による冷
却を開始する。また、必要があれば、この材料がパリソ
ンと接する面に接着剤を塗布して、この中空成形品の成
形を行ってもよい。If necessary, a material to be adhered to the surface of the hollow molded product is provided between the outside of the parison and either the first mold 1 or the second mold during molding of the hollow molded product. Alternatively, the hollow molded article can be molded by inserting the material between the first mold 1 and the second mold and adhering this material at once. When such a material is used, the outside of the parison comes into contact with the first mold 1 or the second mold or the first mold 1 and the second mold through this material. However, except for this, the hollow molding can be performed in the same manner as the above method. At this time, the above-mentioned material is brought into contact with the parison and the first mold 1 or the second mold, or the first mold 1 and the second mold, and then the above-mentioned refrigerant. And start cooling by introducing gas. If necessary, an adhesive may be applied to the surface of the material that contacts the parison to form the hollow molded article.

【００３７】このように、中空成形品表面に張り付ける
材料としては、シート状など各種形状のものを用いるこ
とができる。シート状材料としては、布、皮および、樹
脂などから形成された連続気泡構造をもつスポンジ、多
孔性または非多孔性のシート、フィルムがあげられる。
上述の布としては、合成繊維、天然繊維、ガラス繊維、
無機繊維などからなる織布、不織布などが用いられ、上
述の皮としては、合成皮革または天然皮革が用いられ
る。また、上述のスポンジ、シートおよびフィルムを形
成する材料としては、熱可塑性樹脂、熱硬化性樹脂、レ
ーヨン、セルロース、炭素繊維各種などを、１種類また
は、２種類以上組み合わせて用いることができる。As described above, various materials such as a sheet can be used as the material to be attached to the surface of the hollow molded article. Examples of the sheet-like material include cloth, leather, sponge having an open-cell structure formed of resin and the like, porous or non-porous sheet, and film.
As the above-mentioned cloth, synthetic fiber, natural fiber, glass fiber,
Woven or non-woven fabrics made of inorganic fibers are used, and synthetic leather or natural leather is used as the leather. As a material for forming the above-mentioned sponge, sheet and film, thermoplastic resin, thermosetting resin, rayon, cellulose, various carbon fibers and the like can be used alone or in combination of two or more.

【００３８】上述の中空成形品の成形方法の例において
は、パリソン内部より、大量の冷媒およびガスが、この
パリソン内部に速やかに行き渡り、パリソンを冷却する
ことができ、中空成形品の冷却時間を、従来の方法によ
る冷却時間の１／２〜１／４程度に短縮することができ
コストの低減を図ることができる。また、短時間で十分
に冷却できるので、中空成形品の収縮率のばらつきを小
さくすることができ、変形が少なく寸法変化のない、そ
の内部が均一な中空成形品を安定して製造することがで
きる。In the above example of the method for molding a hollow molded article, a large amount of refrigerant and gas can be quickly spread from the inside of the parison to the inside of the parison, and the parison can be cooled. The cooling time can be reduced to about 1/2 to 1/4 of the conventional method, and the cost can be reduced. Further, since it can be sufficiently cooled in a short time, it is possible to reduce the variation in the shrinkage ratio of the hollow molded product, and it is possible to stably manufacture a hollow molded product having a uniform inside without deformation and dimensional change. it can.

【００３９】また、ピンチオフのヒケがないことから
も、応力の集中がなく、均一の強度をもつ中空成形品の
製品を製造できると共に、さらに寸法も均一な製品がで
きる。また、成形中に、パリソンの移動を必要としない
ので大型の中空成形品に対しても適用可能である。Since there is no pinch-off sink mark, it is possible to manufacture a hollow molded product having uniform strength without concentration of stress, and also having a uniform size. Further, since it is not necessary to move the parison during molding, it can be applied to a large hollow molded product.

【００４０】以上、図１ないし図８を用いて、本発明の
中空成形用吹込ピンおよび中空成形装置の一例を説明し
たが、本発明はこれに限定されるものではなく、要は、
少なくとも２段階の軸方向の移動が可能であるように吹
込ピンが構成され、かつ金型キャビティ面より突き刺し
た状態で排出路の開閉が可能であればよく、例えば外筒
を軸方向に移動させる構造としてもよい。特に中空成形
用吹込ピンを金型底部あるいは底部近くのコーナー等へ
刺す構造とすると、内部冷却後の冷媒の排出の効率が高
く、製品内部への冷媒の残留がなくなり好ましい。Although one example of the blow molding blow pin and the blow molding apparatus according to the present invention has been described above with reference to FIGS. 1 to 8, the present invention is not limited to this, and the essential point is:
It suffices that the blow pin is configured so that it can be moved in at least two stages in the axial direction, and that the discharge path can be opened and closed while being pierced from the mold cavity surface. For example, the outer cylinder is moved in the axial direction. It may be a structure. In particular, it is preferable that the blow molding blow pin is pierced into the bottom of the mold or a corner near the bottom, so that the efficiency of discharging the refrigerant after the internal cooling is high and the refrigerant does not remain inside the product.

【００４１】また上記実施例においては、図８に示すよ
うに、主流４２を冷媒（水）とし、副流４１をガス（空
気）としたが、冷媒とガスの供給パイプを交換して、副
流４１を冷媒（水）とし、主流４２をガス（空気）とし
てもよい。主流４２をガスとすると、冷媒の噴射量は減
少するが、冷媒をより細かい霧状として噴射することが
できる。Further, in the above embodiment, as shown in FIG. 8, the main stream 42 is the refrigerant (water) and the sub stream 41 is the gas (air). The stream 41 may be a refrigerant (water) and the main stream 42 may be a gas (air). When the main stream 42 is gas, the amount of refrigerant injected is reduced, but the refrigerant can be injected in a finer mist state.

【００４２】[0042]

【実施例】以下、本発明を実施例によって説明する。以
下の実施例において、合成樹脂には密度０．９５４ｇ／
ｃｍ3、ＪＩＳ−Ｋ７６１０で測定した温度１９０℃、
荷重２１．６ｋｇにおけるメルトフローレートが５．０
ｇ／１０分である高密度ポリエチレンを使用した。成形
した中空成形品は縦２５０ｍｍ、横２００ｍｍ、高さ１
００ｍｍ、体積約５ｌの直方体状の中空成形品であり、
重量が１．０ｋｇである。また使用した吹込ピンの先端
の角度は片側３０℃で、外筒は外径１２ｍｍ、肉厚１ｍ
ｍ、また内筒は外径８ｍｍ、肉厚１ｍｍとし、内筒内部
の断面積と、内筒と外筒の間の空間部の断面積を同一と
し、注入と排気が略同一量となるようにした。EXAMPLES The present invention will be described below with reference to examples. In the following examples, the synthetic resin has a density of 0.954 g /
cm 3 , a temperature of 190 ° C. measured by JIS-K7610,
A melt flow rate of 5.0 at a load of 21.6 kg
High density polyethylene with g / 10 min was used. The molded hollow molded product is 250 mm long, 200 mm wide, and 1 in height.
This is a rectangular parallelepiped hollow molded product with a diameter of 00 mm and a volume of about 5 l.
The weight is 1.0 kg. The angle of the tip of the blow pin used was 30 ° C on one side, and the outer cylinder had an outer diameter of 12 mm and a wall thickness of 1 m.
In addition, the inner cylinder has an outer diameter of 8 mm and a wall thickness of 1 mm, the cross-sectional area inside the inner cylinder is the same as the cross-sectional area of the space between the inner cylinder and the outer cylinder, and injection and exhaust are approximately the same amount. I chose

【００４３】（実施例）先端片側３０゜の円錐形とし周
囲には孔径１．５ｍｍで４５゜の角度に５個ずつ計４０
個の孔を設けた。また先端方向と手前方向の穴は先端お
よび手前方向に傾けた穴とした。２００℃に溶融した合
成樹脂を押し出し機により上記成形品を成形できる分割
金型の間に外形８０ｍｍのダイからパリソンを押し出し
た。この時のパリソン厚みは約１５ｍｍであった。この
パリソンを金型の下であるプリピンチ板で挟み、パリソ
ン内の空気を閉じこめて金型内に収容した。この際金型
内にあるパリソンは金型のキャビティ面に軽く接触する
状態になった。この状態では図１の吹込ピン位置であ
る。その後シリンダー５を作動させ、ノズル７以下の内
筒部を金型キャビティ内に刺し、パリソン内に挿入した
（図２）。その後、ガスとして空気を吹込賦形する。賦
形する時間は、５秒以下でも成形ができ、さらに全く賦
形工程を経ずにいきなり水と空気を混合したものを噴霧
状態にしてパリソン内に噴霧しても成形することができ
た。(Embodiment) A cone having a 30 ° end on one side is formed, and a total of 40 holes each having a hole diameter of 1.5 mm and an angle of 45 ° are provided in total.
The holes are provided. The holes in the front end direction and the front direction were holes that were inclined toward the front end and the front direction. A parison was extruded from a die having an outer diameter of 80 mm between split molds capable of molding the above-mentioned molded product by a synthetic resin melted at 200 ° C by an extruder. The parison thickness at this time was about 15 mm. The parison was sandwiched between pre-pinch plates below the mold, and the air in the parison was trapped and stored in the mold. At this time, the parison in the mold was in a state of lightly contacting the cavity surface of the mold. In this state, the blow pin position is shown in FIG. After that, the cylinder 5 was operated, the inner cylinder part of the nozzle 7 and below was inserted into the mold cavity and inserted into the parison (FIG. 2). After that, air is blown and shaped as gas. Molding was possible even for 5 seconds or less, and it was possible to mold by suddenly spraying a mixture of water and air into the parison without performing the molding step.

【００４４】その後、シリンダー６を作動させ内筒のみ
再度同軸方向に進み（約２０ｍｍ）外筒と内筒の間隙を
つくった。これにより先端の微細孔から冷媒としての水
とガスとしての空気を混合し噴霧状態にしてパリソン内
に噴霧し、冷却を行った。これと同時に外筒と内筒の間
の間隙より系外へ放出した。その圧力は、水７ｋｇ／ｃ
ｍ2、空気６ｋｇ／ｃｍ2、排気圧力３ｋｇ／ｃｍ2とし
た。そして成形後の成形品の取り出し温度を６０℃から
９０℃まで変化させたときの冷却に要する時間（Ｂ）を
測定し、水による冷却を行わない場合の冷却時間（Ａ）
と比較した。結果を表１に示す。ただし表１での冷却時
間短縮効果は、以下のようにして求めたものである。 Ｃ（％）＝（Ａ−Ｂ）／Ａ×１００After that, the cylinder 6 was operated to move only the inner cylinder again in the coaxial direction (about 20 mm) to form a gap between the outer cylinder and the inner cylinder. As a result, water as a refrigerant and air as a gas were mixed from the fine holes at the tip to be in a sprayed state and sprayed into the parison for cooling. At the same time, it was discharged out of the system through the gap between the outer cylinder and the inner cylinder. The pressure is 7 kg / c of water
m 2 , air 6 kg / cm 2 , and exhaust pressure 3 kg / cm 2 . Then, the time (B) required for cooling when the temperature of taking out the molded product after molding is changed from 60 ° C. to 90 ° C. is measured, and the cooling time (A) when not cooled with water
And compared. The results are shown in Table 1. However, the effect of shortening the cooling time in Table 1 is obtained as follows. C (%) = (A−B) / A × 100

【００４５】[0045]

【表１】 [Table 1]

【００４６】（比較例）本発明の中空成形装置に代え
て、注入ピンと排出ピンの２本を備えた従来の中空成形
装置を用いた以外は実施例と同様に成形品を作製し、冷
却時間短縮効果を調べた。その結果を表２に示す。(Comparative Example) A molded product was prepared in the same manner as in the Example except that a conventional hollow molding apparatus having two injection pins and discharge pins was used instead of the hollow molding apparatus of the present invention, and the cooling time was changed. The shortening effect was investigated. Table 2 shows the results.

【００４７】[0047]

【表２】 [Table 2]

【００４８】表１及び表２に示した結果より、実施例と
比較例の冷却時間短縮効果はいずれも約７０％と変わら
なかった。したがって、本発明の中空成形装置を用いれ
ば、従来の横吹き方式における冷却効果を保持しつつ、
吹込ピン跡の穴塞ぎ工程を不要にできることがわかる。From the results shown in Tables 1 and 2, the cooling time shortening effect of each of the examples and the comparative examples was about 70%, which was the same. Therefore, by using the blow molding apparatus of the present invention, while maintaining the cooling effect in the conventional horizontal blowing method,
It can be seen that it is possible to eliminate the step of closing the hole on the blow pin.

【００４９】[0049]

【発明の効果】本発明によれば、合成樹脂中空成形品の
中空成形において、パリソンの賦形のためのガスまたは
ガスと冷媒の噴射と、この成形品の効率的な冷却のため
の冷媒または冷媒とガスの噴射と、このガスまたは冷媒
の排出を１本のピンで行うことが可能であるので、製品
のノズルの跡に残る穴が１個だけとなり、不要な穴を塞
ぐ工具や手間が省けるとともに、信頼性や外観の良好な
製品が得られる。また、ガスまたは冷媒の排出を、上記
パリソンの冷却と同時に行うことができるので、成形品
を短時間に効率的に冷却することができ、製造工程が短
縮化されるだけでなく、同一の冷却時間での収縮率が小
さいため製品形状も変形が少なく、内容量も大きく外観
良好な成形品が得られる。また、パリソンの賦形をガス
と霧状化された冷媒の噴出によって行うことにより、賦
形工程と冷却工程を同時進行させることができ、さらな
る製造工程の短縮化が実現される。According to the present invention, in the hollow molding of a synthetic resin hollow molded article, a gas or a gas and a refrigerant for shaping a parison and a refrigerant or a refrigerant for efficiently cooling the molded article are used. Since it is possible to inject the refrigerant and gas and discharge this gas or refrigerant with one pin, there is only one hole left on the product nozzle mark, and there is no need for tools or labor to close unnecessary holes. It can be omitted and a product with good reliability and appearance can be obtained. Further, since the gas or the refrigerant can be discharged at the same time as the cooling of the parison, the molded product can be efficiently cooled in a short time, which not only shortens the manufacturing process but also makes it possible to perform the same cooling. Since the shrinkage ratio with time is small, the product shape is not deformed much, and the molded product with a large internal volume and a good appearance can be obtained. Moreover, by performing the shaping of the parison by jetting the gas and the atomized refrigerant, the shaping step and the cooling step can proceed simultaneously, and the manufacturing process can be further shortened.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の中空成形装置の一例を示す断面図であ
って、中空成形用吹込ピンが金型内に収納された状態を
示す図である。FIG. 1 is a cross-sectional view showing an example of a blow molding apparatus of the present invention, showing a state where blow blow pins for blow molding are housed in a mold.

【図２】本発明の中空成形装置の一例を示す断面図であ
って、中空成形用吹込ピンが排出路を閉鎖しつつ金型内
に挿入された状態を示す図である。FIG. 2 is a cross-sectional view showing an example of the blow molding apparatus of the present invention, showing a state where the blow molding blow pin is inserted into the mold while closing the discharge passage.

【図３】本発明の中空成形装置の一例を示す断面図であ
って、中空成形用吹込ピンが排出路を開口しつつ金型内
に挿入された状態を示す図である。FIG. 3 is a cross-sectional view showing an example of the blow molding apparatus of the present invention, showing a state where the blow molding blow pin is inserted into the mold while opening the discharge passage.

【図４】本発明の中空成形用吹込ピンの一例を示す一部
断面図である。FIG. 4 is a partial cross-sectional view showing an example of a blow molding blow pin of the present invention.

【図５】本発明の中空成形用吹込ピンの一例を示す断面
図であって、排出路が閉鎖された状態を示す図である。FIG. 5 is a cross-sectional view showing an example of the blow molding blow pin of the present invention, showing a state in which the discharge passage is closed.

【図６】本発明の中空成形用吹込ピンの一例を示す断面
図であって、排出路が開口された状態を示す図である。FIG. 6 is a cross-sectional view showing an example of the blow molding blow pin of the present invention, showing a state in which a discharge path is opened.

【図７】本発明の中空成形用吹込ピンの一例を示す断面
図であって、排出路が閉鎖した状態でガスを供給する様
子を示した動作説明図である。FIG. 7 is a cross-sectional view showing an example of the blow molding blow pin of the present invention, which is an operation explanatory view showing a state of supplying gas with the discharge passage being closed.

【図８】本発明の中空成形用吹込ピンの一例を示す断面
図であって、排出路が開口した状態で冷媒とガスの噴射
および排出を行う様子を示した動作説明図である。FIG. 8 is a cross-sectional view showing an example of the blow molding blow pin of the present invention, which is an operation explanatory view showing a state in which the refrigerant and the gas are injected and discharged with the discharge passage being opened.

【符号の説明】[Explanation of symbols]

１…第一の金型、２…分割金型、４…中空成形用吹込ピ
ン、５…第一の駆動手段、６…第二の駆動手段、７…噴
射ノズル、８…混合ヘッド、９…内筒、１１…段差部、
１２…縮径部、１３…チップ、１４…噴射孔、２３…外
筒、２４…排出路、２８…混合リング、４１…副流、４
２…主流、Ａ…内筒部。DESCRIPTION OF SYMBOLS 1 ... 1st metal mold, 2 ... Division metal mold | die, 4 ... Blowing pin for hollow molding, 5 ... 1st drive means, 6 ... 2nd drive means, 7 ... Injection nozzle, 8 ... Mixing head, 9 ... Inner cylinder, 11 ... Step portion,
Reference numeral 12 ... Reduced diameter portion, 13 ... Tip, 14 ... Injection hole, 23 ... Outer cylinder, 24 ... Discharge passage, 28 ... Mixing ring, 41 ... Substream, 4
2 ... Mainstream, A ... Inner cylinder.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 金型内のパリソンに突き刺して該パリソ
ン内に冷媒とガスの少なくとも一方を噴出して該パリソ
ンの賦形および冷却を行う中空成形用吹込ピンであっ
て、 先端部が鋭利で、該先端部の近傍に冷媒およびガスの少
なくとも一方を噴出する複数の噴射孔が形成された内筒
部と、 該内筒部の外方に同軸にかつ軸方向に沿って相対移動可
能に設けられた外筒とを備え、 該外筒と内筒部との間に隙間を設け、上記外筒をその先
端が内筒部先端に接近した前進位置に相対移動させた時
には該隙間が閉じられ、上記外筒を該前進位置より後退
させた時には、該隙間が金型内と連通して上記冷媒を排
出する排出路となるように構成されたことを特徴とする
中空成形用吹込ピン。1. A blow molding pin for hollow molding, which pierces a parison in a mold and ejects at least one of a refrigerant and a gas into the parison to shape and cool the parison, the tip of which is sharp. An inner cylinder portion in which a plurality of injection holes for ejecting at least one of a refrigerant and a gas are formed in the vicinity of the tip portion, and an inner cylinder portion is provided outside the inner cylinder portion coaxially and capable of relative movement in the axial direction. And a gap provided between the outer cylinder and the inner cylinder portion, and the gap is closed when the outer cylinder is relatively moved to the forward position where the tip of the outer cylinder approaches the tip of the inner cylinder portion. A blow-molding blow-in pin for hollow molding, characterized in that, when the outer cylinder is retracted from the forward position, the gap serves as a discharge path communicating with the inside of the mold to discharge the refrigerant. 【請求項２】 第一の金型と第二の金型から形成される
分割金型と、この第一の金型に形成された貫通孔内に挿
入された請求項１記載の中空成形用吹込ピンと、上記分
割金型を貫通孔軸方向に進退駆動させて上記中空成形用
吹込ピンの先端部を金型キャビティ面から突出または上
記貫通孔内に収納する第一の駆動手段と、上記内筒部を
貫通孔軸方向に進退駆動させて上記排出路を開閉する第
二の駆動手段を備えた中空成形装置。2. A hollow mold according to claim 1, wherein the mold is divided into a first mold and a second mold, and the mold is inserted into a through hole formed in the first mold. A blow-in pin, a first drive means for driving the split mold forward and backward in the axial direction of the through-hole, and projecting the tip end of the blow-molding blow-in pin from the mold cavity surface or accommodating in the through-hole; A hollow molding device comprising a second drive means for driving the tubular part forward and backward in the axial direction of the through hole to open and close the discharge path. 【請求項３】 金型のキャビティ面より１本の中空成形
用吹込ピンを賦形されるパリソンに突き刺し、上記中空
成形用吹込ピンより上記パリソン内にガスと霧状化され
た冷媒を噴出して上記パリソンの賦形および冷却を行い
つつ、この噴出された冷媒の排出を上記中空成形用吹込
ピンを用いて上記冷却と同時に行うことを特徴とする中
空成形品の成形方法。3. A hollow molding blow pin is pierced from a cavity surface of a mold into a shaped parison, and gas and atomized refrigerant are jetted from the hollow molding blow pin into the parison. While molding and cooling the parison, the ejected refrigerant is discharged at the same time as the cooling using the blow molding blow pin. 【請求項４】 上記パリソンの賦形をガスの噴出により
行うことを特徴とする請求項３記載の中空成形品の成形
方法。4. The method for molding a hollow molded article according to claim 3, wherein shaping of the parison is performed by jetting gas.
JP02831696A 1996-02-15 1996-02-15 Blow pin for blow molding and blow molding equipment Expired - Fee Related JP3510034B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP02831696A JP3510034B2 (en) 1996-02-15 1996-02-15 Blow pin for blow molding and blow molding equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP02831696A JP3510034B2 (en) 1996-02-15 1996-02-15 Blow pin for blow molding and blow molding equipment

Publications (2)

Publication Number Publication Date
JPH09216277A true JPH09216277A (en) 1997-08-19
JP3510034B2 JP3510034B2 (en) 2004-03-22

Family

ID=12245217

Family Applications (1)

Application Number Title Priority Date Filing Date
JP02831696A Expired - Fee Related JP3510034B2 (en) 1996-02-15 1996-02-15 Blow pin for blow molding and blow molding equipment

Country Status (1)

Country Link
JP (1) JP3510034B2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6537056B1 (en) * 1998-09-30 2003-03-25 The Japan Steel Works, Ltd. Needle blow nozzle and blow molding apparatus
JP2010195020A (en) * 2009-02-27 2010-09-09 Honda Motor Co Ltd Needle pin for blow molding
DE102013006594A1 (en) * 2013-04-17 2014-10-23 Kautex Textron Gmbh & Co. Kg Process for producing a container made of thermoplastic material
JP2016043563A (en) * 2014-08-22 2016-04-04 株式会社Fts Air supply device for blow molding
CN107139434A (en) * 2017-04-17 2017-09-08 东北大学 A kind of air tube structure being molded for Plastic Drum
JP2018144403A (en) * 2017-03-08 2018-09-20 株式会社Fts Method for blow molding and blow pin
JP2019188647A (en) * 2018-04-20 2019-10-31 大日本印刷株式会社 Production method of composite container, blow molding mold, blow molding transfer sheet, and composite container
JP2019188646A (en) * 2018-04-20 2019-10-31 大日本印刷株式会社 Production method of blow molding container, blow molding mold, blow molding transfer sheet, and blow molding container
CN110696329A (en) * 2019-10-17 2020-01-17 焦二辉 Blowing mandrel mechanism and hollow blow molding machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6537056B1 (en) * 1998-09-30 2003-03-25 The Japan Steel Works, Ltd. Needle blow nozzle and blow molding apparatus
JP2010195020A (en) * 2009-02-27 2010-09-09 Honda Motor Co Ltd Needle pin for blow molding
DE102013006594A1 (en) * 2013-04-17 2014-10-23 Kautex Textron Gmbh & Co. Kg Process for producing a container made of thermoplastic material
DE102013006594B4 (en) * 2013-04-17 2015-06-18 Kautex Textron Gmbh & Co. Kg Process for producing a container made of thermoplastic material
US10005221B2 (en) 2013-04-17 2018-06-26 Kautex Textron Gmbh & Co. Kg Method for producing a container from thermoplastic material
JP2016043563A (en) * 2014-08-22 2016-04-04 株式会社Fts Air supply device for blow molding
JP2018144403A (en) * 2017-03-08 2018-09-20 株式会社Fts Method for blow molding and blow pin
CN107139434A (en) * 2017-04-17 2017-09-08 东北大学 A kind of air tube structure being molded for Plastic Drum
JP2019188647A (en) * 2018-04-20 2019-10-31 大日本印刷株式会社 Production method of composite container, blow molding mold, blow molding transfer sheet, and composite container
JP2019188646A (en) * 2018-04-20 2019-10-31 大日本印刷株式会社 Production method of blow molding container, blow molding mold, blow molding transfer sheet, and blow molding container
CN110696329A (en) * 2019-10-17 2020-01-17 焦二辉 Blowing mandrel mechanism and hollow blow molding machine

Also Published As

Publication number Publication date
JP3510034B2 (en) 2004-03-22

Similar Documents

Publication Publication Date Title
CN100513122C (en) Method for injection expansion molding of thermoplastic resin
JP3510034B2 (en) Blow pin for blow molding and blow molding equipment
US8153235B2 (en) Molded thermoplastic articles
US20060204606A1 (en) Blow molding method and apparatus, and metallic mold apparatus and a needle blow nozzle
KR100281929B1 (en) Method and apparatus for simultaneous injection molding of articles with complex shapes
CN109890885B (en) Resin for foam molding, foam molded body, and method for producing same
US6547996B1 (en) Production apparatus of expansion-molded article, auxiliary member for transfer of foamed particles and production method of expansion-molded article
JP3597268B2 (en) Blow pin for internal cooling of hollow molding
JPH06278199A (en) Molding method and device for hollow container
US6537056B1 (en) Needle blow nozzle and blow molding apparatus
EP0633121B1 (en) Method for manufacturing a hollow molded body
EP0633123B1 (en) Method for blow molding tubular container
JP4558164B2 (en) Molding method for hollow molded products
JPH09183150A (en) Preparation of hollow double wall molded article
KR102120633B1 (en) Foam molded body
JP3808011B2 (en) Injection molding method and mold assembly of molded product having solid part and hollow part
WO2023058525A1 (en) Resin for expansion molding, method for producing same, method for producing expansion molded body, and method for producing structure
US20240149507A1 (en) System and method of molding a hollow article
JPH09239819A (en) Molding of hollow molded product
JPH0970879A (en) Method and apparatus for blow molding of hollow molded product
JP2001310356A (en) Needle nozzle for blow molding and molding method
JPH08142174A (en) Molding method for synthetic resin hollow molded article
JPH1190953A (en) Injection molding method of resin molding having hollow part and molding apparatus
JPH0318163Y2 (en)
JPH06182866A (en) Blow pin for molding hollow part

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20031216

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20031224

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090109

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090109

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100109

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110109

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110109

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120109

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120109

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130109

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130109

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140109

Year of fee payment: 10

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees