JP3027753B1 - Manufacturing method of synthetic resin hollow molded article - Google Patents
Manufacturing method of synthetic resin hollow molded articleInfo
- Publication number
- JP3027753B1 JP3027753B1 JP11206423A JP20642399A JP3027753B1 JP 3027753 B1 JP3027753 B1 JP 3027753B1 JP 11206423 A JP11206423 A JP 11206423A JP 20642399 A JP20642399 A JP 20642399A JP 3027753 B1 JP3027753 B1 JP 3027753B1
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- tube
- elastic skin
- elastic
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
【要約】
【課題】 金型1の内部に吹込んだ加圧空気により加熱
原管6をブロ−成形するに当り、金型1にその両端が固
定され、加圧空気で膨張するゴムチュ−ブ5に前記原管
6をフリ−状態で外嵌合して、間接的にこの原管6をブ
ロ−成形すると原管6が妄動する。
【解決手段】 ゴムチュ−ブ5の中央部を薄肉、両端部
を厚肉として中央部を先ず膨張させてから両端部を膨張
させると原管6が妄動しない。Abstract: PROBLEM TO BE SOLVED: To blow-mold a heated raw tube 6 by pressurized air blown into a mold 1, both ends of which are fixed to the mold 1 and expanded by a pressurized air. When the original tube 6 is externally fitted to the outer tube 5 in a free state, and the original tube 6 is indirectly blow-formed, the original tube 6 is perturbed. SOLUTION: When a center portion of a rubber tube 5 is thinned and both end portions are thickened and a center portion is expanded first and then both end portions are expanded, the original tube 6 does not move.
Description
【0001】[0001]
【発明の属する技術分野】本発明は、分割成形型内にゴ
ム状の弾性皮体を設けて、合成樹脂中空状成形品を製造
する方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 method for producing a synthetic resin hollow molded article by providing a rubber-like elastic skin in a split mold.
【0002】[0002]
【従来の技術】合成樹脂成形品の主な成形方法として
は、射出成形法、押出し成形法、真空成形法、および中
空成形法等があり、その中の中空成形法は、溶融状態の
合成樹脂を円筒形状で吊下させ、下方から加圧空気用ノ
ズルを円筒形状溶融合成樹脂内に挿入すると同時に、外
側を成形型で覆い、次いで加圧空気熔着ノズルを通して
加圧空気を流入して溶融合成樹脂を外側の成形型に密着
させて成形すものが一般的である(ホットパリソン法と
いう)。2. Description of the Related Art The main molding methods of synthetic resin molded articles include injection molding, extrusion molding, vacuum molding, and hollow molding, among which the hollow molding method is a method of molding synthetic resin in a molten state. At the same time, insert the nozzle for pressurized air into the cylindrical molten synthetic resin from the bottom, cover the outside with the mold at the same time, then inject pressurized air through the pressurized air welding nozzle to melt. In general, a synthetic resin is molded in close contact with an outer mold (called a hot parison method).
【0003】かかる中空成形法の中には、前記溶融合成
樹脂を円筒状で吊下させる方法の他、円筒形状に一次成
形した素材例えば原管や原板を加熱軟化させて、成形型
内に挿入し、該加熱軟化させた素材の内部に加圧空気を
流入して成形する方法や、加熱軟化素材の内部に弾性皮
体を挿入して、該弾性皮体の内部に加圧空気を流入し、
膨張させて成形する方法がある(コ−ルドパリソン法と
いう。例えば特許第2850217号公報参照)。[0003] In the hollow molding method, besides a method of suspending the molten synthetic resin in a cylindrical shape, a material which is primarily molded into a cylindrical shape, for example, an original tube or an original plate is heated and softened and inserted into a molding die. Then, pressurized air is flowed into the heat-softened material to form, or an elastic skin is inserted into the heat-softened material, and pressurized air is flowed into the elastic skin. ,
There is a method of molding by expanding (referred to as a cold parison method, for example, see Japanese Patent No. 2850217).
【0004】これらの一次成形素材を加熱軟化させて内
部に加圧空気を流入して成形するコ−ルドパリソン法
は、ホットパリソン法より加熱温度が低く、加圧成形が
容易であるため、成形装置が大幅に簡素化できる利点が
ある。The cold parison method, in which the primary molding material is heated and softened and pressurized air is introduced into the inside to form the material, has a lower heating temperature than the hot parison method and is easier to press-mold. Has the advantage that it can be greatly simplified.
【0005】また、かかるコ−ルドパリソン法では、加
熱軟化させた素材の内部に直接加圧空気を流入させる方
法が一般的であるが、弾性皮体を用いる成形法(前掲の
特許方法)においては、さらに次のような特長がある。In the cold parison method, a method in which pressurized air is directly introduced into a material softened by heating is generally used. However, in a molding method using an elastic skin (the above-mentioned patent method), Has the following features.
【0006】すなわち、 1)加熱軟化素材の内部に直接加圧空気を流入させる場
合は、成形の都度、挿入する素材と成形型の隙間からの
加圧流体漏れ防止を要求されるが、弾性皮体を用いる場
合は、加圧流体は該弾性皮体内に封じ込まれ、漏れるこ
とは無い。したがって、成形型の製作が容易になり、経
済的である。[0006] 1) When pressurized air is allowed to flow directly into the heat-softening material, it is required to prevent leakage of pressurized fluid from the gap between the material to be inserted and the mold every time molding is performed. If a body is used, the pressurized fluid is sealed within the elastic skin and does not leak. Therefore, the fabrication of the mold is facilitated and economical.
【0007】2)同様の理由から、加熱軟化素材を成形
型に挟み込む(クランプまたはチャッキングという)必
要がなくなるため、素材寸法を短くできて素材のロスが
少なくなり経済的である。2) For the same reason, there is no need to insert the heat-softened material in the mold (referred to as clamping or chucking), so that the size of the material can be shortened and the loss of the material is reduced, which is economical.
【0008】3)加圧流体の流入による弾性皮体の膨張
によって、加熱軟化素材を成形型に押付けるため素材の
伸展が均一になって、肉厚の部分的なバラツキが小さ
い。[0008] 3) The expansion of the elastic skin due to the inflow of the pressurized fluid causes the heat-softened material to be pressed against the mold, so that the material can be uniformly spread, and the partial thickness variation is small.
【0009】[0009]
【発明が解決しようとする課題】ところが、前記弾性皮
体を介して加熱軟化素材を拡径する方法において、該弾
性皮体が加圧流体の流入によって膨張する時、加圧流体
の流入方法、加熱軟化素材の設置方法、あるいはまた弾
性皮体の取付け方法等いろいろな要因で、弾性皮体の膨
張開始地点が異なり、その結果、加熱軟化素材が弾性皮
体の膨張地点から膨張遅延方向へ押し寄せられて、均一
形状の成形品が得られない場合が起こり得る問題があっ
た。However, in the method of expanding the heat-softening material through the elastic skin, a method for injecting the pressurized fluid when the elastic skin is expanded by the flow of the pressurized fluid, Due to various factors such as the method of installing the heat-softening material and the method of attaching the elastic skin, the expansion start point of the elastic skin is different, and as a result, the heat-softening material is pushed in the expansion delay direction from the expansion point of the elastic skin. As a result, there is a problem that a molded article having a uniform shape may not be obtained.
【0010】この問題の解決策としては、加熱軟化素材
の移動防止のため、成形型と弾性皮体とを取付けている
中芯の間に、加熱軟化素材の端部を挟み込む方法がある
が、この方法では、チャッキングロスを無くせないため
弾性皮体を用いる効果が低減する。As a solution to this problem, there is a method in which an end of the heat-softening material is sandwiched between a core having a mold and an elastic body attached thereto in order to prevent the heat-softening material from moving. In this method, since the chucking loss cannot be eliminated, the effect of using the elastic skin is reduced.
【0011】また、加熱軟化素材の片寄りが発生する
と、弾性皮体が加熱軟化素材に巻き込まれ、該弾性皮体
に傷を付けるため寿命が短くなる問題があった。Further, when the heat-softening material is shifted, the elastic skin is caught in the heat-softening material, which damages the elastic skin, resulting in a short life.
【0012】そこで、本発明の主たる目的は前記した問
題を解消し、より大きな効果を得ることにある。Accordingly, a main object of the present invention is to solve the above-mentioned problem and obtain a greater effect.
【0013】[0013]
【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)内側にキャビティを形成する
成形型の内部に加圧流体により膨張伸展する弾性皮体を
設置し、前記成形型と該弾性皮体との間に形成される空
間に加熱軟化状態の合成樹脂被成形体をフリ−の状態で
挿入して、該弾性皮体内に加圧流体を流入して膨張さ
せ、該加熱軟化状態の合成樹脂被成形体をキャビティに
沿わせて成形する合成樹脂中空状成形品の製造方法にお
いて、該弾性皮体の断面積を部分的に変化させ、加圧膨
張伸展時に前記の部分的な変化により、膨張伸展の時間
差をつけることを特徴とする合成樹脂中空状成形品の製
造方法にあり、また、2)加熱軟化した状態の塩ビ等の
熱可塑性樹脂製原管を割り金型にセットし、前記原管内
に加圧空気を吹込んでブロ−成形するに当り、前記金型
でその両端をクランプされ、前記加熱した状態を守り、
かつ、加圧空気により膨張する弾性チュ−ブに、前記原
管を弾性チュ−ブより短尺にしてフリ−の状態で外嵌
し、該弾性チュ−ブに加圧空気を吹込むことにより原管
の内面を、吹込んだ空気で急冷しないようにして大径の
合成樹脂中空状成形品の製造方法において、前記弾性チ
ュ−ブの比較的フリ−な状態で膨張する中央部を薄肉と
し、クランプ側を厚肉として加圧膨張伸展時に時間差を
つけることを特徴とする合成樹脂中空状成形品の製造方
法にある。In order to achieve the above object, the gist of the present invention is as follows. 1) An elastic skin which expands and expands with a pressurized fluid is installed inside a mold forming a cavity inside, A synthetic resin molded body in a heated and softened state is inserted in a free state into a space formed between a molding die and the elastic skin, and a pressurized fluid flows into the elastic skin to expand it. In the method for manufacturing a synthetic resin hollow molded article in which the heat-softened synthetic resin molded article is molded along a cavity, the cross-sectional area of the elastic skin is partially changed, and the above-mentioned elastic cross-section is expanded and stretched under pressure. A method of manufacturing a synthetic resin hollow molded article characterized by providing a time difference of expansion and extension by a partial change, and 2) a raw pipe made of thermoplastic resin such as polyvinyl chloride which is heated and softened. Set in a mold and blow compressed air into the original tube Bro - per the molding is clamped to both ends in the mold, protect state in which the heating,
In addition, the original tube is shortened from the elastic tube and fitted around the elastic tube in a free state, and the compressed tube is blown into the elastic tube. In a method of manufacturing a large-diameter synthetic resin hollow molded article by preventing the inner surface of a tube from being quenched by blown air, a center portion of the elastic tube which expands in a relatively free state is made thin, A method for producing a synthetic resin hollow molded product, characterized in that the clamp side is made thick to provide a time difference during pressure expansion and extension.
【0014】[0014]
【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1〜3は本発明の実施形
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. 1 to 3 are sectional views of an embodiment of the present invention.
【0015】図1の示す第1の実施の形態例は、弾性皮
体2の断面形状を全体に略円筒状とし、軸方向の固定し
た両端部を厚肉状態にし、膨張伸展時比較的フリ−な状
態の中央部を薄肉状態にして両部位間を徐々に肉厚変化
させたものであり、図2および図3に示すものは第2、
第3の実施の形態例である。In the first embodiment shown in FIG. 1, the cross-sectional shape of the elastic body 2 is substantially cylindrical as a whole, and both ends fixed in the axial direction are made thick, so that the elastic skin 2 is relatively free at the time of expansion and extension. The central part of the negative state is made thin and the thickness between the two parts is gradually changed, and those shown in FIG. 2 and FIG.
This is a third embodiment.
【0016】以下、図1を用いて詳細に説明する。図1
において、1,1aは上下あるいは複数個に分割(例え
ば上下に2分割)した金属(軟鋼あるいはアルミニュウ
ム合金など)製の成形用金型であり、内面にキャビティ
(成形品外面形成面)7を有している。The details will be described below with reference to FIG. FIG.
1, 1a is a molding die made of metal (mild steel or an aluminum alloy or the like) which is divided into upper and lower parts or plural parts (for example, divided into upper and lower parts), and has a cavity (molded product outer surface forming surface) 7 on the inner surface. are doing.
【0017】また、この上下に2分割した成形用金型1
および1aは、成形時の空気孔(または空気抜溝)1b
を必要に応じて適宜複数個配備している。該成形用金型
1および1aの内部には貫通する形で弾性皮体2と該弾
性皮体2を保持する中芯3および3aとが設置されてい
る。The upper and lower mold halves 1
And 1a are air holes (or air vent grooves) 1b during molding.
Are deployed as needed. Inside the molding dies 1 and 1a, an elastic skin 2 and cores 3 and 3a for holding the elastic skin 2 are provided so as to penetrate therethrough.
【0018】この左右の中芯3および3aには、加圧流
体(空気または油)流入口4が穿設されており、これら
の中芯3および3aは複数の中芯連結棒3bで一体化さ
れている。該弾性皮体2は、その両端を固定具5で中芯
3および3aに固定されている。A pressurized fluid (air or oil) inlet 4 is bored in the left and right cores 3 and 3a, and these cores 3 and 3a are integrated by a plurality of core connecting rods 3b. Have been. The elastic skin 2 is fixed at its both ends to the cores 3 and 3a by fixtures 5.
【0019】該弾性皮体2の外側には、該弾性皮体2の
外径より大きな内径(加熱状態における内径を含む)を
持ち、予め当該合成樹脂固有の軟化温度以上に加熱した
原管にたる加熱軟化素材6をフリ−の状態で外嵌してい
る。The outer tube of the elastic skin 2 has an inner diameter larger than the outer diameter of the elastic skin 2 (including the inner diameter in a heated state), and the original tube heated in advance to a softening temperature specific to the synthetic resin or more. The heat softening material 6 is fitted outside in a free state.
【0020】該原管たる加熱軟化素材6は前記略円筒状
の弾性皮体2の全長より短く、成形用金型1および1a
が形成するキャビティ7内に納まる長さとなっている。The heat-softening material 6 as the original tube is shorter than the entire length of the substantially cylindrical elastic skin 2, and is formed by the molding dies 1 and 1a.
Has a length that can be accommodated in the cavity 7 formed.
【0021】以上の様な構成において、成形用金型1お
よび1aを型締めし、中芯3および3aの加圧流体流入
口4から加圧流体を流入させることによって、該弾性皮
体2は膨張し、加熱軟化素材6と接して当該加熱軟化素
材6をも共に膨張させ、成形用金型1および1aの内面
に該加熱軟化素材6を押し当てて膨張を終え、求める成
形品を得ることができる。In the above construction, the elastic skin 2 is formed by clamping the molding dies 1 and 1a and allowing the pressurized fluid to flow from the pressurized fluid inlet 4 of the cores 3 and 3a. Expands, comes into contact with the heat-softened material 6, expands the heat-softened material 6 together, and presses the heat-softened material 6 against the inner surfaces of the molding dies 1 and 1a to complete the expansion and obtain a desired molded product. Can be.
【0022】加熱軟化素材6の材質が硬質塩化ビニ−ル
樹脂である場合は、加熱軟化素材6の加熱表面温度は、
大凡100〜120℃とし、加圧流体は常温の空気とし
て流入圧力を0.6〜1MPa(6.1〜10.2kg
f/cm 2)として拡径率(成形品外周長さ÷素材外周
長さ×100)を150〜170%とすることが適当で
ある。拡径率の増大は原材料費に直接影響することか
ら、原材料費低減のため拡径率を200%以上とするこ
ともある。When the material of the heat-softening material 6 is a hard vinyl chloride resin, the heating surface temperature of the heat-softening material 6 is as follows:
Approximately 100 to 120 ° C., and the pressurized fluid is air at room temperature and the inflow pressure is 0.6 to 1 MPa (6.1 to 10.2 kg).
f / cm 2 ), it is appropriate that the diameter expansion ratio (the outer peripheral length of the molded article / the outer peripheral length of the material × 100) is 150 to 170%. Since the increase in the diameter expansion rate directly affects the raw material cost, the diameter expansion rate may be set to 200% or more to reduce the raw material cost.
【0023】加熱軟化素材6の拡径率を増大させること
により、原材料費の低減を図ることができる反面、拡径
率の増大は、白化、亀裂などの外観不良や、弾性皮体2
の部分的な膨張速度(時間)のずれにより、加熱軟化素
材6が片側に押し寄せられて成形不良を誘発し易くな
る。By increasing the diameter expansion rate of the heat-softened material 6, the cost of raw materials can be reduced. On the other hand, the increase in the diameter expansion rate is caused by poor appearance such as whitening and cracks and the elastic skin 2
Due to the partial deviation of the expansion speed (time), the heat-softened material 6 is pushed to one side, and it is easy to induce molding failure.
【0024】そこで、特にこれらの成形不良を改善する
ために、本実施形態例では、該弾性皮体2の固定した両
端部分を厚肉状態にし、比較的フリ−に膨張する中央部
付近を薄肉状態にして両部位間の肉厚を徐々に変化さ
せ、加圧流体流入時に該弾性皮体2の中央部から膨張さ
せるようにしている。Therefore, in order to improve these molding defects in particular, in the present embodiment, the fixed end portions of the elastic skin 2 are made thick, and the vicinity of the center portion which expands relatively free is made thin. In this state, the thickness between the two portions is gradually changed so that the elastic skin 2 expands from the central portion when the pressurized fluid flows.
【0025】したがって、該弾性皮体2が中央部から膨
張し、加熱軟化素材6を共に中央部から膨張させること
により、左右方向に生じる膨張力が相殺して成形用金型
1および1aの片側に押し寄せられることがなくなり成
形不良を防止できる。Therefore, when the elastic skin 2 expands from the center and the heat-softening material 6 expands from the center, the expansion force generated in the left-right direction is canceled out, so that the one side of the molding dies 1 and 1a. And the molding failure can be prevented.
【0026】この方法によれば、成形用金型1および1
aと固定具5との間に加熱軟化素材6の両端を挟み込ん
で加熱軟化素材6の拡径時の移動防止を図る必要は無
く、素材のチャッキングロスを発生させることも無い。According to this method, the molding dies 1 and 1
It is not necessary to sandwich both ends of the heat-softening material 6 between the a and the fixture 5 to prevent the heat-softening material 6 from moving at the time of expanding the diameter, and no chucking loss of the material occurs.
【0027】該弾性皮体2が中央部から膨張し、加熱軟
化素材6が片側に押し寄せられる現象が解消できると、
弾性皮体2が加熱軟化素材6に巻き込まれることも無く
なり、弾性皮体2の傷つきを防止できるため、寿命(耐
久時間)を改善することができる。When the phenomenon that the elastic skin 2 expands from the center and the heat-softening material 6 is pushed to one side can be eliminated,
The elastic skin 2 is also prevented from being caught in the heat-softening material 6, and the elastic skin 2 can be prevented from being damaged, so that the life (durable time) can be improved.
【0028】該弾性皮体2の材質の実施例として、伸び
率が100〜1000%と高く、最高使用温度が130
℃と耐熱性のあるクロロプレンゴムが適している。As an example of the material of the elastic skin 2, the elongation is as high as 100 to 1000% and the maximum operating temperature is 130.
Chloroprene rubber, which has heat resistance to ℃, is suitable.
【0029】また、肉厚の変化量は、僅かな差をつけた
だけでも十分であるが、薄肉部を厚肉の85〜50%程
度とすることが好ましく、本実施形態例では厚肉状態部
を5mm、薄肉状態部を3mmとし、薄肉部を厚肉部の
60%としている。Although the variation of the thickness is sufficient even with a slight difference, it is preferable that the thin portion is about 85 to 50% of the thick portion. The portion is 5 mm, the thin portion is 3 mm, and the thin portion is 60% of the thick portion.
【0030】したがって、かかる成形法によれば、例え
ば塩ビまたはABS等の原管を用いて、合成樹脂製マン
ホ−ルを成形すると、点検筒径650mmφ〜700m
mφの大径のものが製造できる。Therefore, according to this molding method, when a synthetic resin manhole is molded using a raw tube of, for example, PVC or ABS, an inspection cylinder diameter of 650 mmφ to 700 m
A large diameter of mφ can be manufactured.
【0031】特に、点検筒を接続する立上り接続部の高
さが大きくとれ、しかも、厚肉で構成されて強度を保
ち、特にFRP等のオ−バレイ的な補強をする必要がな
い、との特典が得られる。In particular, the height of the rising connection portion for connecting the inspection tube can be made large, and it is made of a thick wall to maintain the strength, and it is not necessary to reinforce the overlay such as FRP. Benefits are obtained.
【0032】図2は、一端を開口し他端が閉塞された袋
状の加熱軟化素材6aに対し、先端を閉塞し、かつま
た、開口端より先端を薄肉状態にした弾性皮体2aを用
いて、袋状加熱軟化素材6aの先端部から意図的に膨張
せしめる実施の形態例であり、また、図3は、図1に用
いた両端支持固定のチュ−ブ状弾性皮体2を複層構造2
b,2cとして、少なくともその内の一層2cの中央部
に肉盗み穴2dを複数箇所設けて、該弾性皮体2b,2
cの断面積を部分的に変化させた別の実施の形態例であ
る。FIG. 2 shows a bag-like heat-softening material 6a having one end opened and the other end closed, using an elastic skin 2a having a closed end and a thinner end than the open end. FIG. 3 shows an embodiment in which the bag-like heat-softening material 6a is intentionally expanded from the tip end thereof. FIG. Structure 2
At least two holes 2d are provided at the center of one layer 2c of the elastic skins 2b and 2c.
14 is another embodiment in which the cross-sectional area of c is partially changed.
【0033】なお、弾性皮体2の材質は、前記したクロ
ロプレンゴムの他、耐熱性に優れたシリコンゴムや、伸
縮性のある合成樹脂フィルムを用いてもよい。In addition, as the material of the elastic skin 2, besides the above-mentioned chloroprene rubber, silicon rubber excellent in heat resistance or an elastic synthetic resin film may be used.
【0034】また、肉厚の変化方法は必ずしも図1の実
施形態例の如く徐々に変化させる必要は無く、1段以上
の階段状に変化させた場合でも同様の作用が得られる。The method of changing the wall thickness does not necessarily need to be changed gradually as in the embodiment shown in FIG. 1, and the same effect can be obtained even when the thickness is changed in one or more steps.
【0035】加熱軟化素材6の材質は、実施形態例の硬
質塩化ビニ−ル樹脂の他、アクリル樹脂、高密度ポリエ
チレン樹脂、ABS樹脂、ポリプレン樹脂などの他の熱
可塑性樹脂であってもよい。The material of the heat-softening material 6 may be other thermoplastic resin such as acrylic resin, high-density polyethylene resin, ABS resin and polypropylene resin, in addition to the hard vinyl chloride resin of the embodiment.
【0036】[0036]
【発明の効果】本発明によれば、加圧流体の圧力によ
り、弾性皮体の断面積の小さい部分から膨張して加熱軟
化素材に接し、当該当接部分を起点に素材を押し広げて
金型に密着させたり、膨張力を対称的に発生させて加熱
軟化素材の片寄り移動を防ぐため、安定した形状の成形
品を得ることができ、チャッキングロスを発生させるこ
とも無い。According to the present invention, by the pressure of the pressurized fluid, the elastic skin expands from a portion having a small cross-sectional area and comes into contact with the heat-softened material. Since the heat-softening material is prevented from moving in one direction by closely adhering to the mold or symmetrically generating an expansion force, a molded article having a stable shape can be obtained, and no chucking loss occurs.
【0037】また、成形品の片寄りに起因する弾性皮体
の寿命低下も防止できることから、材料費および設備費
を大幅に低減できる。Further, since the life of the elastic body can be prevented from being shortened due to the offset of the molded product, material costs and equipment costs can be greatly reduced.
【図1】本発明の主なる第1の実施の形態例を示す断面
図である。FIG. 1 is a sectional view showing a first main embodiment of the present invention.
【図2】本発明の第2の実施の形態例を示す断面図であ
る。FIG. 2 is a sectional view showing a second embodiment of the present invention.
【図3】本発明の第3の実施の形態例を示す断面図であ
る。FIG. 3 is a sectional view showing a third embodiment of the present invention.
1,1a…成形用金型、2,2a,2b,2c…弾性皮
体、2d…肉盗み穴、3,3a…中芯、3b…中芯連結
棒、4…加圧流体流入口、5…固定具、6,6a…加熱
軟化素材1, 1a: Mold for molding, 2, 2a, 2b, 2c: Elastic skin, 2d: Hole for meat, 3, 3a: Core, 3b: Core connecting rod, 4: Pressure fluid inlet, 5 … Fixture, 6,6a… Heat softening material
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平11−48318(JP,A) (58)調査した分野(Int.Cl.7,DB名) B29C 49/00 - 49/80 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-48318 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 49/00-49/80
Claims (2)
部に加圧流体により膨張伸展する弾性皮体を設置し、前
記成形型と該弾性皮体との間に形成される空間に加熱軟
化状態の合成樹脂被成形体をフリ−の状態で挿入して、
該弾性皮体内に加圧流体を流入して膨張させ、該加熱軟
化状態の合成樹脂被成形体をキャビティに沿わせて成形
する合成樹脂中空状成形品の製造方法において、該弾性
皮体の断面積を部分的に変化させ、加圧膨張伸展時に前
記の部分的な変化により、膨張伸展の時間差をつけるこ
とを特徴とする合成樹脂中空状成形品の製造方法。1. An elastic skin that expands and expands with a pressurized fluid is installed inside a mold that forms a cavity inside, and a heat softened state is formed in a space formed between the mold and the elastic skin. Insert the synthetic resin molded body of
In a method of manufacturing a synthetic resin hollow molded article in which a pressurized fluid flows into and expands the elastic skin, and the heat-softened synthetic resin molded body is molded along a cavity, the elastic skin is cut off. A method for producing a synthetic resin hollow molded article, characterized in that the area is partially changed, and a time difference in expansion and extension is provided by the partial change during pressure expansion and extension.
脂製原管を割り金型にセットし、前記原管内に加圧空気
を吹込んでブロ−成形するに当り、前記金型でその両端
をクランプされ、前記加熱した状態を守り、かつ、加圧
空気により膨張する弾性チュ−ブに、前記原管を弾性チ
ュ−ブより短尺にしてフリ−の状態で外嵌し、該弾性チ
ュ−ブに加圧空気を吹込むことにより原管の内面を、吹
込んだ空気で急冷しないようにして大径の合成樹脂中空
状成形品の製造方法において、 前記弾性チュ−ブの比較的フリ−な状態で膨張する中央
部を薄肉とし、クランプ側を厚肉として加圧膨張伸展時
に時間差をつけることを特徴とする合成樹脂中空状成形
品の製造方法。2. A raw tube made of a thermoplastic resin such as polyvinyl chloride or the like in a softened state is set in a split mold, and pressurized air is blown into the raw tube to perform blow molding. The original tube is shortened from the elastic tube and fitted around the elastic tube in a free state while being clamped to protect the heated state and expand by the pressurized air. A method of manufacturing a large-diameter synthetic resin hollow molded article by blowing compressed air into a tube so that the inner surface of the original tube is not rapidly cooled by the blown air. A method for producing a synthetic resin hollow molded product, characterized in that a central portion which expands in a smooth state is made thinner and a clamp side is made thicker so as to provide a time difference during pressure expansion and extension.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11206423A JP3027753B1 (en) | 1999-07-21 | 1999-07-21 | Manufacturing method of synthetic resin hollow molded article |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11206423A JP3027753B1 (en) | 1999-07-21 | 1999-07-21 | Manufacturing method of synthetic resin hollow molded article |
Publications (2)
Publication Number | Publication Date |
---|---|
JP3027753B1 true JP3027753B1 (en) | 2000-04-04 |
JP2001030343A JP2001030343A (en) | 2001-02-06 |
Family
ID=16523139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11206423A Expired - Fee Related JP3027753B1 (en) | 1999-07-21 | 1999-07-21 | Manufacturing method of synthetic resin hollow molded article |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3027753B1 (en) |
-
1999
- 1999-07-21 JP JP11206423A patent/JP3027753B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2001030343A (en) | 2001-02-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3754851A (en) | Apparatus for forming multiaxially oriented containers | |
US5190715A (en) | Blow molding process for production of hollow type articles | |
US5017126A (en) | Blow molding apparatus | |
JPH0635150B2 (en) | Method for producing stretch-blown plastic bottle with handle | |
JPS63249616A (en) | Method for molding resin | |
JP4656569B2 (en) | Manufacturing method of hollow molded product | |
US3873660A (en) | Method for forming multiaxially oriented containers | |
JP3027753B1 (en) | Manufacturing method of synthetic resin hollow molded article | |
US3933417A (en) | Apparatus for forming multiaxially oriented containers | |
GB2126156A (en) | A method of controlling the temperature of a parison during injection stretch-blow moulding | |
JP2932454B2 (en) | Composite molded article and method for producing the same | |
JPH08290465A (en) | Blow molding method | |
JPH01110116A (en) | Apparatus for molding hollow molded product | |
JP3809658B2 (en) | Blow molding apparatus for boot and method for manufacturing the same | |
US3289248A (en) | Blow molding apparatus with blowmold exhaust means | |
JPS5951889B2 (en) | Injection stretch blow molding method | |
JPH027821B2 (en) | ||
JP3567254B2 (en) | Method for producing synthetic resin blow molded article | |
JP3858408B2 (en) | Multi-layer molding mold | |
JP2784704B2 (en) | Molding device for foam with skin | |
JP3202778B2 (en) | Blow molding method for resin molded products | |
US6284187B1 (en) | Blow molding needle for liquid cooling | |
JP3052811B2 (en) | Mall and its blow molding method | |
JP3590599B2 (en) | Simple blow molding machine | |
JPS5954524A (en) | Metallic mold for molding hollow double-wall box body |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
TRDD | Decision of grant or rejection written | ||
R150 | Certificate of patent or registration of utility model |
Ref document number: 3027753 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
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: 20080128 Year of fee payment: 8 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080128 Year of fee payment: 8 |
|
R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
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: 20090128 Year of fee payment: 9 |
|
R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090128 Year of fee payment: 9 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100128 Year of fee payment: 10 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100128 Year of fee payment: 10 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110128 Year of fee payment: 11 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110128 Year of fee payment: 11 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120128 Year of fee payment: 12 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120128 Year of fee payment: 12 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130128 Year of fee payment: 13 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140128 Year of fee payment: 14 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
LAPS | Cancellation because of no payment of annual fees |