JPH09207205A - Blow molding method using cold parison - Google Patents
Blow molding method using cold parisonInfo
- Publication number
- JPH09207205A JPH09207205A JP4053196A JP4053196A JPH09207205A JP H09207205 A JPH09207205 A JP H09207205A JP 4053196 A JP4053196 A JP 4053196A JP 4053196 A JP4053196 A JP 4053196A JP H09207205 A JPH09207205 A JP H09207205A
- Authority
- JP
- Japan
- Prior art keywords
- blow molding
- raw
- blow
- rubber tube
- 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.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
(57)【要約】
【課題】 コ−ルドパリソンを用いて、複雑な外形状の
ブロ−成形品を安く作る。
【解決手段】 加熱軟化した塩ビ原管６を２つ割金型
１，１ａにセットし、この原管６内に加圧冷風を吹込ん
でブロ−成形するに当り、この金型１，１ａでクランプ
されるゴムチュ−ブ９に、原管６を遊外嵌して、ゴムチ
ュ−ブ９に前記の加圧冷風を吹込んで原管６をブロ−成
形する。ゴムチュ−ブ９により加熱原管６が断熱される
ので、原管６の内面温度が下がらず、複雑な外形状のブ
ロ−成形品が安くできる。
(57) 【Abstract】 PROBLEM TO BE SOLVED: To inexpensively make a blow molded article having a complicated outer shape by using a cord parison. SOLUTION: Two vinyl chloride original pipes 6 that have been heated and softened are set in split molds 1, 1a, and when blow cold molding is blown into the raw pipes 6 to perform blow molding, the molds 1, 1a are used. The raw pipe 6 is loosely fitted to the rubber tube 9 to be clamped, and the pressurized cold air is blown into the rubber tube 9 to blow-mold the raw pipe 6. Since the raw tube 6 is thermally insulated by the rubber tube 9, the inner surface temperature of the original tube 6 does not drop, and a blow molded product having a complicated outer shape can be manufactured at a low cost.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ゴムチュ−ブ等ゴ
ム膜を内側に重合したコ−ルドパリソンを用いるブロ−
成形法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower using a cold parison in which a rubber film such as a rubber tube is polymerized inside.
It relates to a molding method.
【０００２】[0002]
【従来の技術】一般のブロ−成形法（吹込成形法）で
は、パリソンを成形するのに時間を要したり、パリソン
を成形する技術が困難であったりするので、原料メ−カ
で予め正確なパリソンを作り、このパリソンを、加圧流
体用ノズルを使用するブロ−専用の成形機にかけ、ブロ
−成形することが行われている。これをコ−ルドパリソ
ン法というが、これは作られた冷態状態のパリソン（合
成樹脂製の原管または原板を指す）を所定の寸法に裁断
し、これを再加熱軟化して金型にセットし、ブロ−成形
する方法である。2. Description of the Related Art In a general blow molding method (blow molding method), it takes time to mold a parison and the technique for molding a parison is difficult. It is practiced to make a parison, and to apply this parison to a blower-specific molding machine using a nozzle for pressurized fluid to perform blow molding. This is called the cold parison method. It is a cold parison that is made (pointing to a synthetic resin raw pipe or plate) cut into a specified size, reheated and softened, and set in a mold. And blow molding.
【０００３】かかるコ−ルドパリソン法はパリソンの生
産性を向上させると共に、成形品の肉厚を均一にする、
という長所をもつ反面、複雑な形状の成形が困難とな
る、という短所もある、といわれている。The cord parison method improves the productivity of the parison and makes the wall thickness of the molded product uniform.
Although it has the advantage that it is difficult to form a complex shape, it is said to have the disadvantage.
【０００４】一方、長年にわたり本出願人は、かかるコ
−ルドパリソン法を改良してブロ−成形を行っている。
すなわち、特公昭３８−２１２３４号公報、特公昭３８
−２３３３８号公報、特公昭３９−２０４４９号公報、
および特公昭４４−７１４９号公報等で示されているご
とく、２つ割した金型内に、加熱軟化した塩ビ製原管を
セットし、この原管の両端にプラグを挿入して原管内を
閉塞する。そして、このプラグには加圧空気孔を穿設し
ている。したがって、金型を閉じることにより、プラグ
を挿入した原管の両端部をクランプした後、原管内に加
圧空気を吹込んでブロ−成形するので、一般のポリエチ
レン製のビンのブロ−成形法のような小形の成形品でな
く、大形のブロ−成形品を長年にわたり生産している。On the other hand, for many years, the present applicant has improved the cold parison method to perform blow molding.
That is, JP-B-38-21234 and JP-B-38
No. 23338, Japanese Patent Publication No. 39-20449,
And as shown in Japanese Patent Publication No. 44-7149, etc., a heat-softened PVC raw pipe is set in a mold that is divided into two parts, and plugs are inserted into both ends of the raw pipe to set the inside of the raw pipe. Block. A pressurized air hole is formed in this plug. Therefore, the mold is closed to clamp both ends of the raw pipe into which the plug has been inserted, and then compressed air is blown into the raw pipe for blow molding, which is a common blow molding method for polyethylene bottles. We have been producing large blow molded products for many years instead of such small molded products.
【０００５】他方、加圧空気ノズルを用いた一般のブロ
−成形法であるが、開かれた金型内にパリソンを連続的
に吊下し、このパリソンの下方から加圧空気用ノズルを
挿入してブロ−成形するに当り、この加圧空気用ノズル
を中心に同心状のパリソン拡径部材を用いてパリソンを
拡径しながらブロ−成形する際、このパリソン拡径部材
をゴム袋で構成し、このゴム袋に加圧空気を吹込んでブ
ロ−成形する提案が知られている（特公平３−５６５２
８号公報参照）。On the other hand, in a general blow molding method using a pressurized air nozzle, a parison is continuously suspended in an opened mold, and a nozzle for pressurized air is inserted from below the parison. When blow molding the parison while expanding the diameter of the parison with the concentric parison expanding member centering on the pressurized air nozzle, the parison expanding member is formed of a rubber bag. However, there is known a proposal of blow molding by blowing pressurized air into this rubber bag (Japanese Patent Publication No. 3-5652).
No. 8).
【０００６】[0006]
【発明が解決しようとする課題】ところが、前記の本出
願人が長年にわたり実施しているコ−ルドパリソン法で
は、加圧した冷風を加熱した原管に吹込むので、特に、
原管の径が大（例えば、１５０ｍｍφ）になれば、ブロ
−による拡径時間（例えば、１分）を要し、原管の内面
が冷却された状態で拡径するので、エッジのある成形品
が得られにくく、しかも、抗張力を失った原管を空気圧
力で無理に拡径することとなり、歪みや割れを生じやす
く、また、白化された成形品になる、という問題があっ
た。However, in the cold parison method, which the applicant of the present invention has been implementing for many years, the pressurized cold air is blown into the heated raw tube.
If the diameter of the raw pipe becomes large (for example, 150 mmφ), it takes a time for the diameter to be expanded by a blower (for example, 1 minute), and the inner surface of the raw pipe expands in a cooled state, so that there is edge formation. It is difficult to obtain a product, and the original pipe that has lost the tensile strength is forced to expand its diameter by air pressure, which easily causes distortion and cracking, and there is a problem that it becomes a whitened molded product.
【０００７】そのため、加圧空気を加熱して用いること
もあったが、大規模の空気加熱装置を必要とし、また、
成形後、成形製品を冷却する必要があって生産性を阻害
していた。Therefore, although pressurized air is sometimes used after being heated, a large-scale air heating device is required, and
After molding, it was necessary to cool the molded product, which impeded productivity.
【０００８】また、前記の提案のゴム袋を介在したブロ
−成形法では、コ−ルドパリソン法ではなく、金型には
連続したパリソンが吊下するので、ゴム袋をパリソン内
にセットすることが困難となり、ひいては、加圧空気用
ノズルにゴム袋を装着しなければならず、したがって、
大型のブロ−成形品には不適当となり、また、ゴム袋の
頭部におけるブロ−成形に難点があり、しかもブロ−成
形後、パリソンの両端部にはチャッキングロス（クラン
プシロともいう）、すなわち切り捨て部分が必然的に生
じる、という問題があった。Further, in the above-described blow molding method involving a rubber bag, a continuous parison is hung from the mold instead of the cold parison method, so that the rubber bag can be set in the parison. Difficulty, and therefore the pressurized air nozzle has to be fitted with a rubber bag, therefore
It is not suitable for large blow molding, and there is a problem in blow molding at the head of the rubber bag. Moreover, after the blow molding, chucking loss (also called clamp white) at both ends of the parison, That is, there is a problem that the cut-off portion is inevitably generated.
【０００９】そこで本発明の主たる目的は、前記した２
つの問題を全面的に解消することにある。Therefore, the main object of the present invention is to provide the above-mentioned 2
It is to solve one problem entirely.
【００１０】[0010]
【課題を解決するための手段】かかる目的を達成するた
め、本発明の要旨は、１）加熱軟化した樹脂製原管を割
り金型にセットし、前記原管内に加圧流体を導入してブ
ロ−成形するに当り、前記金型でクランプされるゴムチ
ュ−ブに前記原管をゴムチュ−ブより短尺にして外嵌
し、該ゴムチュ−ブに加圧流体を導入することにより原
管をブロ−成形することを特徴とするコ−ルドパリソン
を用いるブロ−成形法とし、また、２）加熱軟化した樹
脂製原板を割り金型にセットし、前記原板の片面に加圧
流体を導入してブロ−成形するに当り、前記原板の加圧
流体作用側にゴム板を重ねて金型でクランプすることに
より原板をブロ−成形することを特徴とするコ−ルドパ
リソンを用いるブロ−成形法とする。In order to achieve the above object, the gist of the present invention is as follows: 1) A heat-softened raw resin pipe is set in a split mold, and a pressurized fluid is introduced into the raw pipe. In the blow molding, the raw tube is fitted onto a rubber tube clamped by the mold with a length shorter than the rubber tube, and a pressurized fluid is introduced into the rubber tube to blow the raw tube. -A blow molding method using a cold parison characterized by molding, and 2) setting a heat-softened resin original plate in a split mold and introducing a pressurized fluid to one surface of the original plate to perform the blow process. A blow molding method using a cold parison characterized in that a rubber plate is superposed on the side of the original plate on which the pressurized fluid acts and is clamped by a mold in the forming process, and the original plate is blow molded.
【００１１】[0011]
【発明の実施の形態】本発明を、添付図面に示す実施の
形態例により詳細に述べる。図１は本発明の第１の実施
の形態例の断面図であり、図２は第２の実施の形態例の
断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments shown in the accompanying drawings. FIG. 1 is a sectional view of a first embodiment of the present invention, and FIG. 2 is a sectional view of a second embodiment.
【００１２】これらの実施の形態例は、いずれもコ−ル
ドパリソンとして、塩ビ製原管または塩ビ製原板を用い
るもので、特に、拡径されたブロ−成形品の口径は１０
０ｍｍφ〜５００ｍｍφの寸法となる大型ブロ−成形品
に好適となる。また、ここで用いる加圧空気圧は８ｋｇ
／ｃｍ2 の冷風を用いている。In each of these embodiments, a vinyl chloride raw pipe or a vinyl chloride raw plate is used as the cold parison, and in particular, the diameter of the expanded blow molded product is 10 mm.
It is suitable for large blow molded products with a size of 0 mmφ to 500 mmφ. The pressurized air pressure used here is 8 kg.
/ Cm 2 of cold air is used.
【００１３】本発明の第１の実施の形態例を述べる。図
１において、１，１ａは、上下（または左右）に２つ割
り（複数割り）した金属（軟鋼やアルミ合金等を指す）
製のブロ−成形用金型で、図示のものは原管横置タイプ
を構成している。この金型１，１ａには自動クランプ装
置を用いている。すなわち、金型１，１ａの両端には、
それぞれプラグ抜止めプレ−ト２ａ，２ｂ，２ｃ，２ｄ
が固着されており、上金型１は、プラグ抜止めプレ−ト
２ａ，２ｂと共に上下動するようになっていて、上金型
１が下金型１ａに合されたときには、不図示の型締め装
置で下金型１ａに固定されるようになっている。そし
て、下金型１ａは基台３上で固定されている。A first embodiment of the present invention will be described. In FIG. 1, reference numerals 1 and 1a denote a metal (a mild steel, an aluminum alloy, or the like) which is vertically (or horizontally) divided into two (plurality).
The blow molding die is made of a raw tube horizontal type. An automatic clamp device is used for the molds 1 and 1a. That is, at both ends of the molds 1, 1a,
Plug retaining plates 2a, 2b, 2c, 2d, respectively
Is fixed, and the upper mold 1 moves up and down together with the plug retaining plates 2a and 2b. When the upper mold 1 is fitted to the lower mold 1a, a mold (not shown) is attached. It is designed to be fixed to the lower mold 1a by a tightening device. The lower mold 1a is fixed on the base 3.
【００１４】これらの金型１，１ａの内面には、それぞ
れ所定のキャビティ面４，４ａが形成されている。この
キャビティ面４，４ａは、特にエッジをもつ形状（例え
ば、エルボのＯリング溝）を形成している。このキャビ
ティ面４，４ａの両側には、それぞれブロ−成形用折曲
面５，５ａが形成され、この折曲面５は、一般のブロ−
成形法では、原管６の口径が大になると、これに応じた
緩やかな傾斜の折曲面５が必要となり、これが切り捨て
部となる。従来一般のブロ−成形法では、例えば、１０
０ｍｍφの原管の場合、クランプシロと合せてその管長
の１／３を切り捨て部が占めていた。Predetermined cavity surfaces 4 and 4a are formed on the inner surfaces of these molds 1 and 1a, respectively. The cavity surfaces 4 and 4a form a shape with an edge (for example, an elbow O-ring groove). Blow molding curved surfaces 5 and 5a are formed on both sides of the cavity surfaces 4 and 4a, respectively.
In the molding method, when the diameter of the raw pipe 6 becomes large, the bent curved surface 5 having a gentle slope corresponding to this becomes necessary, and this becomes the cut-off portion. In the conventional general blow molding method, for example, 10
In the case of the 0 mmφ original pipe, the cut-out portion occupied 1/3 of the pipe length together with the clamp sill.
【００１５】これらの金型１，１ａ内には、その両側に
おいて、１対の金属製キノコ状プラグ７，７ａが着脱自
在に設けられており、これらのプラグ７，７ａには、そ
れぞれ中心軸上に加圧空気孔８，８ａが貫通して設けら
れている。これらのプラグ７，７ａの頭部には天然ゴム
（合成ゴムでも可）製のゴムチュ−ブ９の端部が嵌合さ
れる、その肉厚だけの深さの嵌合溝１０，１０ａが周設
されている。A pair of metallic mushroom-shaped plugs 7 and 7a are detachably provided on both sides of these molds 1 and 1a, and these plugs 7 and 7a respectively have central axes. Pressurized air holes 8 and 8a are provided therethrough. The ends of a rubber tube 9 made of natural rubber (or synthetic rubber may be fitted) are fitted in the heads of these plugs 7, 7a, and fitting grooves 10, 10a having a depth corresponding to the thickness thereof are formed around the plugs 7, 7a. It is set up.
【００１６】このプラグ７，７ａの頭部の端面には、凹
部１１，１１ａが凹設され、プラグの肉ヌスミを形成す
ると共に、吹込まれた加圧空気を拡散するようにしてい
る。The end faces of the heads of the plugs 7 and 7a are provided with recesses 11 and 11a so that the plugs 7 and 11a form a slim fit and the pressurized air blown therein is diffused.
【００１７】そして、前記のゴムチュ−ブ９の両端部
は、プラグ７の嵌合溝１０に外嵌され、金型１で締付け
られるので劣化し易い。そのため、ゴムチュ−ブ９の両
端部にエア止めリング１２，１２…をインサ−ト成形し
て一体化してもよいし、また、金型１，１ａの方にエア
止めリングを内設してもよい。Both ends of the rubber tube 9 are externally fitted into the fitting groove 10 of the plug 7 and are tightened by the mold 1, so that they are easily deteriorated. Therefore, the air stop rings 12, 12, ... May be inserted and integrated at both ends of the rubber tube 9, or the air stop rings may be provided inside the molds 1, 1a. Good.
【００１８】次に、以上のような実施の形態例の作用を
述べる。例えば、管長約５００ｍｍ、口径９０ｍｍφの
塩ビ製原管６を通常のブロ−加熱温度（例えば１２０〜
１３０℃）より若干高めの温度（１３５℃）に迄加熱
（従来の原管加熱はクランプを考えて、高くできない）
して軟化し、この原管６を、これより若干長尺で、か
つ、金型１のキャビティ面４の軸方向長さより若干長尺
のゴムチュ−ブ９に、軸方向をフリ−にして外嵌する。
勿論、ゴムチュ−ブ９と原管６との間にスキマを設けて
外嵌してもよい。Next, the operation of the above embodiment will be described. For example, a raw PVC pipe 6 having a tube length of about 500 mm and a diameter of 90 mmφ is blown at a normal blow temperature (for example, 120 to
Heating up to a temperature slightly higher than 130 ℃ (135 ℃) (Conventional raw tube heating cannot be increased considering the clamp)
Then, the raw tube 6 is softened, and the raw tube 6 is put on a rubber tube 9 which is slightly longer than the original tube 6 and slightly longer than the axial length of the cavity surface 4 of the mold 1 with the axial direction free. Fit.
Of course, a gap may be provided between the rubber tube 9 and the raw pipe 6 to be fitted on the outside.
【００１９】このゴムチュ−ブ８は、肉厚約２ｍｍで、
約８倍〜約３０倍に膨張可能とするものを用いる。因み
に、原管６をブロ−成形したとき、その口径が１．５倍
にブロ−すると良好なブロ−成形ができるので、ゴムチ
ュ−ブ９を介在させても、原管６のブロ−には支障がな
い。The rubber tube 8 has a wall thickness of about 2 mm,
A material that can expand about 8 times to about 30 times is used. By the way, when the raw pipe 6 is blow molded, good blow molding can be performed if the diameter of the raw pipe 6 is blown to 1.5 times. Therefore, even if the rubber tube 9 is interposed, the raw pipe 6 is blown. There is no problem.
【００２０】次に、原管６を外嵌した状態のゴムチュ−
ブ９の両端には、それぞれプラグ７，７ａを圧入する。
したがって、ここで採用しているゴムチュ−ブ９の口径
は、プラグ７の外径より若干小のものを用いている。そ
して、ゴムチュ−ブ９に嵌合しているプラグ７，７ａ
を、クレ−ン等で把持して下金型１ａに載置し、上金型
１を閉じクランプしてゴムチュ−ブ９を固定する。Next, the rubber tube with the original pipe 6 fitted on it is
Plugs 7 and 7a are press-fitted into both ends of the bush 9, respectively.
Therefore, the diameter of the rubber tube 9 used here is slightly smaller than the outer diameter of the plug 7. Then, the plugs 7 and 7a fitted to the rubber tube 9
Is clamped by a crane or the like and placed on the lower mold 1a, and the upper mold 1 is closed and clamped to fix the rubber tube 9.
【００２１】そこで、プラグ７の加圧空気孔８から約８
ｋｇ／ｃｍ2 の、加熱されていない空気を約１〜２分間
吹込むと、ゴムチュ−ブ９の膨張に伴い、原管６が拡径
され、所定の形状のキャビティ面４，４ａにブロ−成形
される。そのブロ−成形時には、加熱されていない空気
が直接、加熱軟化された原管６に作用せず、ゴムチュ−
ブ９で断熱されて作用するので、原管６の内面は急冷せ
ず、塩ビの抗張力を維持したままで拡径される。その
上、ゴムチュ−ブ９の弾力の慣性が面加圧として、原管
６の拡径に加わるので、原管６の拡径状態は更に良好と
なり、安価で、かつ、生産性のよいブロ−成形でありな
がら、あたかも射出成形のように複雑な成形ができる。
つまり、ブロ−成形一般の短所を解消する。Therefore, from the pressurized air hole 8 of the plug 7 to about 8
When non-heated air of kg / cm 2 is blown for about 1 to 2 minutes, the raw tube 6 is expanded due to the expansion of the rubber tube 9 and blown onto the cavity surfaces 4 and 4a having a predetermined shape. Molded. During the blow molding, the unheated air does not directly act on the heated and softened raw pipe 6 and the rubber tube
Since it acts by being insulated by the bush 9, the inner surface of the raw pipe 6 is not rapidly cooled, and is expanded while maintaining the tensile strength of PVC. Moreover, since the inertia of the elastic force of the rubber tube 9 is applied to the expanded diameter of the raw pipe 6 as a surface pressure, the expanded state of the raw pipe 6 is further improved, and the blow tube is inexpensive and has good productivity. Although it is molding, it can perform complicated molding as if it were injection molding.
That is, the disadvantages of blow molding in general are eliminated.
【００２２】次いで、加圧空気の吹込みを停止し、ブロ
−された原管６が復元しない温度（例えば、７０℃）に
迄、冷却すると、上金型１を開いてブロ−された原管６
をプラグ７ごと取出す。Next, when the blowing of the pressurized air is stopped and the blown raw pipe 6 is cooled to a temperature at which the blown raw pipe 6 is not restored (for example, 70 ° C.), the upper mold 1 is opened and the blown raw pipe 6 is blown. Tube 6
The plug 7 together.
【００２３】したがって、原管６にクランプロスが生じ
ないし、原管６の加熱管理がラフでよいにも拘わらず、
原管６の割れが少ない。しかも、金型のシ−ル部分は簡
単になって金型費が安くなり、ゴムチュ−ブ９の面加圧
によって、原管６の肉厚が一定となる。Therefore, although no clamp loss occurs in the raw pipe 6 and the heating control of the raw pipe 6 may be rough,
There are few cracks in the raw pipe 6. In addition, the seal portion of the mold is simplified and the cost of the mold is reduced, and the surface pressure of the rubber tube 9 makes the wall thickness of the raw pipe 6 constant.
【００２４】特に、前記の実施の形態例は原管６をその
径方向のみに拡径した例で説明したが、エルボ等のよう
に径方向に拡径しながら軸方向も弯曲成形するものでも
よい。In particular, the above-described embodiment has been described with reference to an example in which the raw pipe 6 is expanded only in the radial direction, but it is also possible to use a curved pipe in the axial direction while expanding the diameter in the radial direction such as an elbow. Good.
【００２５】一般のブロ−成形によりエルボを作る場
合、その外曲側と内曲側とは肉厚に差が生じ、ブロ−成
形が困難であったが、この実施の形態例によれば、原管
６はその両端内でクランプ部材で軽く支持され、ゴムチ
ュ−ブ９の軸方向にフリ−の状態で外嵌され、金型１，
１ａにはクランプされていないので、外曲側は軸方向に
伸長せず、内曲側は軸方向に伸長する傾向となるようブ
ロ−成形されるので、エルボの肉厚が可及的に均一とな
る。When an elbow is produced by general blow molding, a difference in wall thickness occurs between the outer curved side and the inner curved side, which makes blow molding difficult. However, according to this embodiment, The raw pipe 6 is lightly supported by clamp members at both ends of the raw pipe 6, and is fitted onto the rubber tube 9 in the axial direction of the rubber tube 9 in a free state.
Since it is not clamped to 1a, it is blow-molded so that the outer curved side does not expand in the axial direction and the inner curved side tends to expand in the axial direction, so the wall thickness of the elbow is as uniform as possible. Becomes
【００２６】次に、第２の実施の形態例について述べ
る。第１の実施の形態例と共通する部分は略す。図２に
おいて、これはコ−ルドパリソンとして塩ビ製原板１３
を用いる。固定されている下金型１４ａには、所定の形
状のキャビティ面（Ｏリング溝のごときものをもつも
の）１５が凹設されており、上下動する上金型１４に
は、前記キャビティ面１５の開口面積より若干大の開口
面積をもつ空気室１６が凹設されている。この空気室１
６には加圧空気孔１７により加圧空気が導入されて拡散
するようになっている。Next, a second embodiment will be described. The parts common to the first embodiment are omitted. In FIG. 2, this is a PVC base plate 13 as a cord parison.
Is used. The fixed lower mold 14a is provided with a cavity surface 15 (having something like an O-ring groove) 15 having a predetermined shape, and the upper mold 14 moving up and down has the cavity surface 15 An air chamber 16 having an opening area slightly larger than the opening area is recessed. This air chamber 1
Pressurized air is introduced into 6 through a pressurized air hole 17 so as to diffuse.
【００２７】そこで、原板１３を下金型１４ａに載置
し、この原板１３に合せてゴム板１８を重ねる。次い
で、上金型１４を閉じると、原板１３とゴム板１８の外
周は、空気室１６の外周縁によりクランプされる。そし
て、加圧空気孔１７より、加熱されていない加圧空気を
空気室１６へ吹込めば、ゴム板１８が膨張して原板１３
を所定の形状、例えば、有底容器にブロ−成形できる。
この場合の原板１３には、上金型１４によるクランプシ
ロを必要とする。Then, the original plate 13 is placed on the lower mold 14a, and the rubber plate 18 is overlapped with the original plate 13 in accordance with the original plate 13. Next, when the upper mold 14 is closed, the outer peripheries of the original plate 13 and the rubber plate 18 are clamped by the outer peripheral edge of the air chamber 16. Then, if unpressurized pressurized air is blown into the air chamber 16 through the pressurized air hole 17, the rubber plate 18 expands and the original plate 13 is expanded.
Can be blow molded into a predetermined shape, for example, a bottomed container.
In this case, the original plate 13 needs a clamp white by the upper mold 14.
【００２８】なお、前記した塩ビ製原管や塩ビ製原板等
のコ−ルドパリソンは、アクリル樹脂や硬質ポリエチレ
ン樹脂等の熱可塑性樹脂であってもよいし、また、加圧
空気は油圧であってもよい。The cold parison such as the vinyl chloride raw pipe and the vinyl chloride raw plate described above may be a thermoplastic resin such as an acrylic resin or a hard polyethylene resin, and the pressurized air is hydraulic. Good.
【００２９】[0029]
【発明の効果】本発明によれば、ゴムチュ−ブやゴム板
等のゴム膜を介してブロ−成形するので、コ−ルドパリ
ソンの加熱軟化温度をラフにしてもブロ−成形に支障は
なく、しかも、加熱されていない加圧流体でブロ−成形
しても、パリソンの内面が急冷されないので、エッジ等
のある複雑な形状のブロ−成形ができる。また、主とし
てゴム膜を金型でクランプするので、製品にクランプシ
ロが残らず、原料費の節減にもなる。According to the present invention, since blow molding is performed through a rubber film such as a rubber tube or a rubber plate, there is no problem in blow molding even if the heating and softening temperature of the cord parison is roughened. Moreover, even if blow molding is performed with a pressurized fluid that is not heated, the inner surface of the parison is not rapidly cooled, so that it is possible to perform blow molding with a complicated shape such as edges. In addition, since the rubber film is mainly clamped by the mold, the product does not have a clamp sill, and the material cost can be reduced.
【図１】本発明の第１の実施の形態例の断面図である。FIG. 1 is a cross-sectional view of a first embodiment of the present invention.
【図２】第２の実施の形態例の断面図である。FIG. 2 is a sectional view of a second embodiment example.
１…金型、６…原管、７…プラグ、９…ゴムチュ−ブ、
１３…原板、１４…金型、１８…ゴム板1 ... Mold, 6 ... Original pipe, 7 ... Plug, 9 ... Rubber tube,
13 ... Original plate, 14 ... Mold, 18 ... Rubber plate
Claims (2)
ットし、前記原管内に加圧流体を導入してブロ−成形す
るに当り、前記金型でクランプされるゴムチュ−ブに前
記原管をゴムチュ−ブより短尺にして外嵌し、該ゴムチ
ュ−ブに加圧流体を導入することにより原管をブロ−成
形することを特徴とするコ−ルドパリソンを用いるブロ
−成形法。1. A heat-softened raw resin pipe is set in a split mold, and a pressurized fluid is introduced into the raw pipe for blow molding, and a rubber tube clamped by the mold is used for the blow molding. A blow molding method using a cold parison characterized in that the raw pipe is blow-molded by fitting the raw pipe into a shorter length than the rubber tube and introducing a pressurized fluid into the rubber tube.
ットし、前記原板の片面に加圧流体を導入してブロ−成
形するに当り、前記原板の加圧流体作用側にゴム板を重
ねて金型でクランプすることにより原板をブロ−成形す
ることを特徴とするコ−ルドパリソンを用いるブロ−成
形法。2. When a heat-softened resin original plate is set in a split mold and a pressurized fluid is introduced into one side of the original plate for blow molding, a rubber plate is placed on the pressurized fluid working side of the original plate. A blow molding method using a cold parison, characterized in that the original plates are blow molded by stacking and clamping with a die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8040531A JP2850217B2 (en) | 1996-02-03 | 1996-02-03 | Blow molding method using cold parison |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8040531A JP2850217B2 (en) | 1996-02-03 | 1996-02-03 | Blow molding method using cold parison |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09207205A true JPH09207205A (en) | 1997-08-12 |
| JP2850217B2 JP2850217B2 (en) | 1999-01-27 |
Family
ID=12583057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8040531A Expired - Lifetime JP2850217B2 (en) | 1996-02-03 | 1996-02-03 | Blow molding method using cold parison |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2850217B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59179025U (en) * | 1983-05-18 | 1984-11-30 | エヌオーケー株式会社 | Hollow body forming equipment |
| JPH03230935A (en) * | 1990-02-06 | 1991-10-14 | Honda Motor Co Ltd | Molding method for fiber reinforced resin |
| JPH05293896A (en) * | 1992-04-20 | 1993-11-09 | Dainippon Printing Co Ltd | Vacuum press lamination molding equipment |
| JPH06134887A (en) * | 1992-10-26 | 1994-05-17 | Showa Denko Du Pont Kk | Manufacturing method of rubber tube with bellows |
| JPH07205168A (en) * | 1994-01-25 | 1995-08-08 | Toyobo Co Ltd | Production of hollow molded product |
-
1996
- 1996-02-03 JP JP8040531A patent/JP2850217B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59179025U (en) * | 1983-05-18 | 1984-11-30 | エヌオーケー株式会社 | Hollow body forming equipment |
| JPH03230935A (en) * | 1990-02-06 | 1991-10-14 | Honda Motor Co Ltd | Molding method for fiber reinforced resin |
| JPH05293896A (en) * | 1992-04-20 | 1993-11-09 | Dainippon Printing Co Ltd | Vacuum press lamination molding equipment |
| JPH06134887A (en) * | 1992-10-26 | 1994-05-17 | Showa Denko Du Pont Kk | Manufacturing method of rubber tube with bellows |
| JPH07205168A (en) * | 1994-01-25 | 1995-08-08 | Toyobo Co Ltd | Production of hollow molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2850217B2 (en) | 1999-01-27 |
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