JPH09323352A - Blow molding and blow molding die - Google Patents

Blow molding and blow molding die

Info

Publication number
JPH09323352A
JPH09323352A JP14541796A JP14541796A JPH09323352A JP H09323352 A JPH09323352 A JP H09323352A JP 14541796 A JP14541796 A JP 14541796A JP 14541796 A JP14541796 A JP 14541796A JP H09323352 A JPH09323352 A JP H09323352A
Authority
JP
Japan
Prior art keywords
parison
air
blow molding
mold
cavity surface
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.)
Pending
Application number
JP14541796A
Other languages
Japanese (ja)
Inventor
Yasuji Kawase
保司 川瀬
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.)
Inoac Corp
Original Assignee
Inoue MTP KK
Inoac Corp
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 Inoue MTP KK, Inoac Corp filed Critical Inoue MTP KK
Priority to JP14541796A priority Critical patent/JPH09323352A/en
Publication of JPH09323352A publication Critical patent/JPH09323352A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/4242Means for deforming the parison prior to the blowing operation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2017Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements outside the article

Abstract

PROBLEM TO BE SOLVED: To smoothly perform a blow molding process by providing an air blowing aperture on the cavity face, of a molding die, which is located at a recessed part for a molding formed on the cavity face, to the recessed part, and lowering a parison extruded from a die head along the cavity of the molding die, blowing the air. SOLUTION: A molding die M is closed and a vacuum suction device located below the molding die M is activated. After that, a parison 6 is extruded from a die head 5. The parison 6 descends along a cavity face 1 being carried by the downward flowing air. At the same time, the air is sent into a guide hole 4. Under this state, the parison 6 passes through a recessed part 2 by the air blown from an air blowing aperture 41, which being caught by a recessed part 2, when the parison 6 comes down to a spot near the recessed part 2. When the parison 6 is past the recessed part 2, the dented part of the parison 6 is restored to its original shape by its own weight by the air blown out of the air blowing aperture 41, and the tip of the parison 6 reaches the lower end of the molding die M being carried by the air current.

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、成形品形状が屈曲
している場合、更に、キャビティに凹部分或いは凸部分
(インサートがキャビティ面に突き出る場合を含む)が
ある場合に適するブロー成形方法及びブロー成形型に関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding method suitable for a case where the shape of a molded product is bent, and further for a case where the cavity has a concave portion or a convex portion (including a case where the insert projects into the cavity surface). It relates to a blow mold.

【0002】[0002]

【従来の技術】ブロー成形のうち、最も一般的とされる
押出しブロー成形は、通常、次のような成形方法がとら
れている。即ち、ダイヘッドから下向きに押し出された
管状のパリソンを、冷却固化しないうちに金型間に挟ん
で空気を吹込んで膨張させ、キャビティ面に押さえつけ
ることによって、成形品の形状に付形させる方法であ
る。そして、屈曲したブロー成形品を造る際には、例え
ば、図3のような三次元成形(吸引式)を採用してき
た。その成形手順を図にしたがって説明すると、先ず、
金型91,92を閉じる(イ)。次いで、金型下方方向
へガス吸引しながらパリソン6を押出す(ロ)。しかる
後、パリソン6が金型下端を通過した時点で上下のシャ
ッター93,94を閉じ、パリソン内に空気を吹込んで
成形する(ハ)。そうして、樹脂が冷却,固化した後
に、金型91,92を開き、ブロー成形品Sを取り出す
のである(ニ)。
2. Description of the Related Art Of the blow molding methods, extrusion blow molding, which is the most general method, usually employs the following molding method. That is, the tubular parison extruded downward from the die head is sandwiched between the molds before being cooled and solidified, air is blown therein to expand it, and it is pressed against the cavity surface to shape it into the shape of the molded product. . Then, when making a bent blow-molded product, for example, three-dimensional molding (suction type) as shown in FIG. 3 has been adopted. Explaining the molding procedure according to the drawing, first,
The molds 91 and 92 are closed (a). Next, the parison 6 is extruded while sucking gas downward in the mold (b). After that, when the parison 6 passes the lower end of the mold, the upper and lower shutters 93 and 94 are closed, and air is blown into the parison to form (c). Then, after the resin has cooled and solidified, the molds 91 and 92 are opened, and the blow molded product S is taken out (d).

【0003】[0003]

【発明が解決しようとする課題】しかるに、キャビティ
面に凹部分97(図4(イ))や凸部分98(図4(ロ))
が存在すると、降下しなければならないパリソン6がそ
こでひっかかってしまい、ブロー成形できなくなる事態
を発生させていた。
However, the concave portion 97 (FIG. 4 (a)) and the convex portion 98 (FIG. 4 (b)) are formed on the cavity surface.
, The parison 6 that had to descend was caught there, which made blow molding impossible.

【0004】本発明は前記問題点を解決するもので、た
とえ、キャビティ面に凹部分や凸部分が設けられていて
も、円滑に遂行可能なブロー成形方法及びブロー成形型
を提供することを目的とする。
The present invention solves the above problems, and an object of the present invention is to provide a blow molding method and a blow molding die which can be smoothly carried out even if the cavity surface is provided with concave portions or convex portions. And

【0005】[0005]

【課題を解決するための手段】請求項1に記載の本発明
の要旨は、金型のキャビティ面に形成された成形品形状
の凹部分に対し、該凹部分の上側に位置するキャビティ
面にエア吹出し口を設け、該エア吹出し口から空気を吹
き出しながら、ダイヘッドより押し出されたパリソンを
金型のキャビティ面に沿わせて降下させるようにしたこ
とを特徴とするブロー成形方法にある。また、請求項2
に記載の本発明の要旨は、金型のキャビティ面に突き出
る凸部分に対し、該凸部分の上側に位置するキャビティ
面にエア吹出し口を設け、該エア吹出し口から空気を吹
出しながら、ダイヘッドより押し出されたパリソンを金
型のキャビティ面に沿わせて降下させるようにしたこと
を特徴とするブロー成形方法にある。請求項3に記載の
本発明のブロー成形方法は、請求項2の凸部分がインサ
ートであることを特徴とする。請求項4に記載の本発明
の要旨は、キャビティ面に設けられた凹部分又は凸部分
に対し、該凹部分又は凸部分の上側に位置するキャビテ
ィ面にエア吹出し口を有して型内を貫通する導孔が形成
されるようにしたブロー成形型にある。
The gist of the present invention as set forth in claim 1 is that a cavity surface located above the cavity portion with respect to the cavity portion of the molded product formed on the cavity surface of the mold. A blow molding method is characterized in that an air outlet is provided, and while blowing air from the air outlet, the parison pushed out from the die head is lowered along the cavity surface of the mold. In addition, claim 2
The gist of the present invention described in, for a convex portion protruding to the cavity surface of the mold, an air outlet is provided in the cavity surface located above the convex portion, while blowing air from the air outlet, from the die head. The blow molding method is characterized in that the extruded parison is lowered along the cavity surface of the mold. The blow molding method of the present invention according to claim 3 is characterized in that the convex portion of claim 2 is an insert. The gist of the present invention according to claim 4 is that, with respect to the concave portion or the convex portion provided on the cavity surface, the cavity surface located above the concave portion or the convex portion has an air blowout port and It is in a blow molding die in which a through hole is formed.

【0006】請求項1,2,4に記載の発明のごとく、
凹部分又は凸部分の上側に位置するキャビティ面にエア
吹出し口を設け、このエア吹出し口から空気を吹き出し
ながら、パリソンをキャビティ面に沿わせて降下させる
と、空気の吹く風でパリソンがうまい具合になびくの
で、凹部分又は凸部分の箇所をパリソンが通り抜けるよ
うになる。請求項3に記載の発明のように、凸部分がイ
ンサートであっても、パリソンの通り抜けは可能であ
る。
According to the invention described in claims 1, 2 and 4,
An air outlet is provided on the cavity surface located above the recessed portion or the convex portion, and when the parison is lowered along the cavity surface while blowing air from this air outlet, the parison is satisfactorily blown by the air. As it flutters, the parison can pass through the concave or convex portions. As in the invention described in claim 3, even if the convex portion is an insert, the parison can be passed through.

【0007】[0007]

【発明の実施の形態】以下、本発明に係るブロー成形方
法及びブロー成形型の実施形態について詳述する。 (1)実施形態1 図1は、ブロー成形方法及びブロー成形型の一形態で、
キャビティ面に形成された成形品形状の凹部分周りの拡
大断面図を示す。 ブロー成形型 金型Mは、ブロー成形に用いる合わせ型で、キャビティ
面1が成形品の形状に合わせて図示のごとく屈曲してい
る。そして、成形品形状をつくる凹部分2が屈曲箇所に
形成されている。このような凹部分2、特に、キャビテ
ィ面1が膨出するサイドにある凹部分2aは、ダイヘッ
ド5から押出されたパリソン6をひっかけてしまい、円
滑なブロー成形を妨げる要因になっている。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a blow molding method and a blow molding die according to the present invention will be described in detail below. (1) Embodiment 1 FIG. 1 shows an embodiment of a blow molding method and a blow molding die.
FIG. 6 is an enlarged cross-sectional view around a recess of a molded product shape formed on the cavity surface. Blow Mold Die M is a matching mold used for blow molding, and the cavity surface 1 is bent as shown in the drawing according to the shape of the molded product. Then, a concave portion 2 that forms the shape of the molded product is formed at the bent portion. Such a concave portion 2, in particular, a concave portion 2a on the side where the cavity surface 1 swells, catches the parison 6 extruded from the die head 5 and becomes a factor that hinders smooth blow molding.

【0008】そこで、本実施形態では、キャビティ面1
が膨出するサイドにある凹部分2aに対し、その上側に
位置するキャビティ面1にエア吹出し口41を設ける。
このエア吹出し口41は、金型M内を貫通する導孔4の
出口側に位置し、該導孔4の入口側は図示しない圧縮エ
ア配管に連結させている。
Therefore, in this embodiment, the cavity surface 1
The air outlet 41 is provided in the cavity surface 1 located above the concave portion 2a on the side where the bulges.
The air outlet 41 is located on the outlet side of the guide hole 4 penetrating through the mold M, and the inlet side of the guide hole 4 is connected to a compressed air pipe (not shown).

【0009】上記エア吹出し口41の具体的位置として
は、障害物となる凹部分2の上縁からの距離L1 が10
mm〜20mmのところにあるのが好ましい。10mm
より距離が近づくと、エア吹出し口41から空気をいく
ら吹き出しても、凹部分2との距離が近づきすぎてパリ
ソン6のなびきが間に合わず、パリソン6が凹部分2に
つっかかってしまうことがあるからである。一方、20
mmより距離が離れてしまうと、空気で凹部分2から遠
ざかるよう折角なびかせたパリソン6が戻ってくるよう
になり、凹部分2にひっかかってしまうケースが存在す
るためである。
As a specific position of the air outlet 41, the distance L 1 from the upper edge of the concave portion 2 which becomes an obstacle is 10
It is preferably in the range of mm to 20 mm. 10mm
When the distance becomes closer, no matter how much air is blown from the air outlet 41, the distance from the recessed portion 2 becomes too close, and the parison 6 may not catch up in time, and the parison 6 may get stuck in the recessed portion 2. Is. On the other hand, 20
This is because, if the distance is larger than mm, the parison 6 that has been bent so as to move away from the recessed portion 2 by air comes back and there is a case where the parison 6 is caught in the recessed portion 2.

【0010】エア吹出し口41の孔径は、0.2mm〜
1.0mmの範囲が好ましく、より好ましくは0.3m
m〜0.5mmの範囲にある。これらの数値より孔径が
小さくなると、所定量以上の吹出し空気量の確保が困難
になり、一方、これらの数値より孔径が大きくなると、
今度は、キャビティ面1に押しつけられブロー成形され
る容器にエア吹出し口41の孔径痕跡が目立つようにな
るからである。エア吹出し口41の孔数は、ここでは1
個のみ図示するが、2個〜10個が適当で、好ましくは
4個〜6個である。エア吹出し口41の孔数が少ない
と、きれいにパリソン6をなびかせることが困難にな
る。逆に、一定個数を越えれば、型製作コストがアップ
するばかりで、効果にさほど変わりがなくなるからであ
る。
The hole diameter of the air outlet 41 is 0.2 mm to
The range of 1.0 mm is preferable, and 0.3 m is more preferable.
It is in the range of m to 0.5 mm. If the hole diameter is smaller than these values, it becomes difficult to secure a blown-out air amount of a predetermined amount or more, while if the hole diameter is larger than these values,
This time, the trace of the hole diameter of the air outlet 41 becomes conspicuous in the container that is pressed against the cavity surface 1 and blow-molded. The number of holes in the air outlet 41 is 1 here.
Although only one is shown in the figure, 2 to 10 are suitable, and preferably 4 to 6. If the number of holes in the air outlet 41 is small, it becomes difficult to make the parison 6 flutter cleanly. On the contrary, if the number of molds exceeds a certain number, the cost for producing the mold will only increase and the effect will not change so much.

【0011】エア吹出し口41から吹き出す空気の温度
は、20℃(常温)〜60℃の範囲に設定される。エネ
ルギー効率等を鑑み、斯る範囲が好ましい。ただ、冬期
等において、吹き出す空気の温度が低すぎると、この空
気が当ったところのパリソン6が局部的に冷やされ、ブ
ロー成形に不具合をもたらすことになる。エア吹出し口
41からの空気の吹出し量については、ブロー比,パリ
ソン6の大きさ,キャビティ面1の形状等によって調整
している。エア吹出し圧は、0.5kg/cm2 〜3k
g/cm2 が好適である。この範囲を越えてしまうと、
パリソン6を損傷させる場合が考えられるからである。
逆に、この範囲に満たないと、いくらエア吹出し口41
から空気を吹き込んでも、空気のパリソン6を押す力が
弱く、パリソン6がなびかないためである。エア吹出し
口41からの空気の吹出す角度は、エア吹出し口41の
あるキャビティ面1に対し、ほぼ直角方向であるのが好
ましい。パリソン6をなびかせるうえで効果的になる。
The temperature of the air blown from the air outlet 41 is set in the range of 20 ° C. (normal temperature) to 60 ° C. This range is preferable in view of energy efficiency and the like. However, if the temperature of the air blown out is too low in winter or the like, the parison 6 where the air hits is locally cooled, which causes a problem in blow molding. The amount of air blown out from the air blowout port 41 is adjusted by the blow ratio, the size of the parison 6, the shape of the cavity surface 1, and the like. Air blowing pressure is 0.5kg / cm 2 ~ 3k
g / cm 2 is preferred. If this range is exceeded,
This is because the parison 6 may be damaged.
On the contrary, if this range is not reached, the air outlet 41
This is because even if air is blown in from the parison 6, the force of the air pushing the parison 6 is weak and the parison 6 does not flow. The angle at which the air blows out from the air blowout port 41 is preferably substantially perpendicular to the cavity surface 1 where the air blowout port 41 is located. It will be effective in making the parison 6 fly.

【0012】符号Vは金型下方方向へガス吸引されてい
る空気の流れを示している。他の構成は、公知のブロー
成形型と同じで、その説明を省略する。尚、図1では型
閉じ状態のブロー成形型を表わす。
Reference numeral V indicates the flow of air that is sucked in gas downward in the mold. The other structure is the same as that of the known blow molding die, and the description thereof is omitted. Incidentally, FIG. 1 shows a blow molding die in a mold closed state.

【0013】ブロー成形方法 次に、前記ブロー成形型を使って本発明のブロー成形方
法について説明する。まず、金型Mを閉じる(図3(イ)
参照)。ここでは、型閉め状態を確保してもよいし、ま
た、金型Mを近づけた状態にとどめてもよい。次いで、
金型Mの下方に位置する真空吸引装置(図示せず)を作
動させ、金型下方方向へガス吸引を行なう。金型Mが、
前述のごとく、型閉じ或いはそれに近い状態にあるの
で、キャビティ内を上から下方向に向かう空気の流れV
ができる(図1)。かくして、パリソン6はキャビティ
面に沿って降下しやすくなっている。
Blow Molding Method Next, the blow molding method of the present invention using the blow molding die will be described. First, the mold M is closed (Fig. 3 (a))
reference). Here, the mold closed state may be ensured, or the mold M may be kept close. Then
A vacuum suction device (not shown) located below the mold M is operated to suck gas downward in the mold. Mold M is
As described above, since the mold is closed or close to it, the air flow V from the top to the bottom in the cavity V
Can be done (Fig. 1). Thus, the parison 6 is easy to descend along the cavity surface.

【0014】しかる後、ダイヘッド5よりパリソン6を
押し出す。本実施形態で使用したパリソン6は、外径が
40mmφ(通常は、30mmφ〜60mmφの範囲に
ある)で、肉厚が4mm(通常は、2mm〜4mmの範
囲にある)のものである。パリソン6は、下方向に向か
う空気の流れに乗って、キャビティ面1に沿うようにし
て降下していく。と同時に、或いはパリソン6の押し出
しと相前後して、導孔4の入口側にあるバルブ(図示せ
ず)を開け、導孔4に空気を送り込む。そして、エア吹
出し口41から空気が吹出し続ける状態を保つ。
After that, the parison 6 is pushed out from the die head 5. The parison 6 used in this embodiment has an outer diameter of 40 mmφ (usually in the range of 30 mmφ to 60 mmφ) and a wall thickness of 4 mm (usually in the range of 2 mm to 4 mm). The parison 6 rides on the downward air flow and descends along the cavity surface 1. At the same time or before or after the parison 6 is pushed out, a valve (not shown) on the inlet side of the guide hole 4 is opened, and air is sent into the guide hole 4. Then, the state where the air continues to blow out from the air outlet 41 is maintained.

【0015】斯る状態下で、前記パリソン6が凹部分2
近くまで降下してくると、エア吹出し口41から吹出す
空気は、パリソン6が凹部分2から離れるようにたなび
かせる(図1のA部分)。従って、パリソン6は凹部分
2にひっかかることなく、凹部分2を通り越していく。
そして、凹部分2を過ぎると、エア吹出し口41の空気
でパリソン6の窪んだ部分もパリソン自身の自重で元の
形状に復帰し、やがて、空気流に乗ってパリソン先端が
金型下端に達する。ところで、上記エア吹出し口41か
ら吹出す空気は、パリソン先端が凹部分2を通過した段
階でストップさせてもよい。パリソン先端が、凹部を一
旦越えてしまえば、後続のパリソン6に流れがついてし
まい、パリソン6が凹部分2にひっかかることはないか
らである。
Under such a condition, the parison 6 has a concave portion 2
When descending to the vicinity, the air blown from the air outlet 41 causes the parison 6 to fly away from the recessed portion 2 (portion A in FIG. 1). Therefore, the parison 6 passes over the concave portion 2 without being caught in the concave portion 2.
Then, after passing through the concave portion 2, the recessed portion of the parison 6 is restored to the original shape by the weight of the parison itself due to the air of the air outlet 41, and eventually the parison tip reaches the lower end of the mold by riding the air flow. . By the way, the air blown out from the air blowout port 41 may be stopped when the tip of the parison passes through the recess 2. This is because once the tip of the parison crosses over the concave portion, the flow goes on to the succeeding parison 6 and the parison 6 does not get caught in the concave portion 2.

【0016】その後、金型上下のシャッターを閉じ、パ
リソン6内に空気を吹込んで成形する(図3(ハ)参
照)。そうして、樹脂が冷却,固化した後に、金型Mを
開き、所望のブロー成形品を取り出すことになる(図3
(ニ)参照)。
After that, the shutters at the top and bottom of the mold are closed, and air is blown into the parison 6 for molding (see FIG. 3C). Then, after the resin is cooled and solidified, the mold M is opened and the desired blow-molded product is taken out (see FIG. 3).
(See (d)).

【0017】効果 本実施形態のブロー成形方法及びブロー成形型によれ
ば、キャビティ面1に成形品形状の凹部分2が形成され
ていても、この凹部分2にパリソン6がひっかかること
はない。エア吹出し口41から吹く空気によって、パリ
ソン6がうまく凹部分2を飛び越えていく。かくして、
円滑なブロー成形方法が確保され、歩留り向上にも寄与
する。また、ブロー成形においては、従来、パリソン径
を少しでも大きくして、生産性向上,品質安定を図りた
かったが、凹部分2がある場合は、これにひっかからな
いようにするために、パリソン6径を小さくしなければ
ならなかった。しかるに、本実施形態によれば、凹部分
2による制約から解放されるので、パリソン径を大きく
して(ブロー比を小さくして)、生産性向上,品質安定
等を図ることが簡単にできるようになる。
Effect According to the blow molding method and the blow molding die of the present embodiment, even if the cavity surface 1 is formed with the concave portion 2 in the shape of a molded product, the parison 6 is not caught in the concave portion 2. The parison 6 successfully jumps over the recessed portion 2 by the air blown from the air outlet 41. Thus,
A smooth blow molding method is secured, which also contributes to improvement in yield. Further, in blow molding, conventionally, it was desired to increase the parison diameter as much as possible to improve productivity and stabilize quality, but if there is a recessed portion 2, in order to prevent it from being caught, the parison 6 The diameter had to be reduced. However, according to the present embodiment, since the restriction due to the recess portion 2 is released, it is possible to easily increase the parison diameter (decrease the blow ratio) and improve the productivity and stabilize the quality. become.

【0018】(2)実施形態2 本実施形態は、図2のようなキャビティ面1に突き出る
凸部分3がある場合、該凸部分3の上側にエア吹出し口
41を設けたブロー成形型とする。そして、エア吹出し
口41から空気を吹出しながら、ダイヘッド5よりパリ
ソン6を押し出し、該パリソンがこれにつっかかってし
まわないようにするブロー成形方法になっている。エア
吹出し口41は、型内を貫通する導孔4の出口側にあ
り、導孔4の入口側には圧縮エア配管が連結している。
凸部分3は、ここでは、インサートになっているが、成
形品形状に基づきキャビティ面1が突き出た凸部を形成
する場合であってもよい。
(2) Embodiment 2 In this embodiment, when there is a protruding portion 3 protruding from the cavity surface 1 as shown in FIG. 2, an air outlet 41 is provided above the protruding portion 3 to provide a blow molding die. . Then, while blowing air from the air outlet 41, the parison 6 is pushed out from the die head 5 so that the parison does not get caught in the blow molding method. The air outlet 41 is located on the outlet side of the guide hole 4 penetrating through the mold, and the compressed air pipe is connected to the inlet side of the guide hole 4.
Although the convex portion 3 is an insert here, it may be a case where the convex portion in which the cavity surface 1 projects is formed based on the shape of the molded product.

【0019】実施形態1の凹部分2と本実施形態の凸部
分3との違いはあるが、エア吹出し口41の具体的位
置,エア吹出し口41の孔径,吹出し空気量,エア吹出
し口41の孔数,エア吹出し口41から吹出す空気の温
度,空気の吹出し量,エア吹出し圧,エア吹出し口41
からの空気の吹出す角度等の構成については、基本的に
実施形態1と同じで、その説明を省略する。ただ、実施
形態1では、ブロー成形方法において、パリソン先端が
通過してしまえば、エア吹出し口41からの空気をスト
ップさせてもよかったが、本実施形態では、パリソン6
の押し出し終了までエア吹出し口41から空気を吹出し
続けねばならない。パリソン6の押し出し終了前にエア
吹出し口41からの空気を止めると、なびいていたパリ
ソン(図2のB部分)が垂れてしまい、凸部分3でパリ
ソン6を破ったり傷つけたりする虞れがあるからであ
る。かくのごとく構成したブロー成形方法及びブロー成
形型も、実施形態1と同様の作用,効果を得る。
Although there are differences between the concave portion 2 of the first embodiment and the convex portion 3 of the present embodiment, the specific position of the air outlet 41, the hole diameter of the air outlet 41, the amount of air blown out, and the air outlet 41 of the air outlet 41. Number of holes, temperature of air blown from the air outlet 41, amount of air blown, air pressure, air outlet 41
The configuration such as the angle at which air is blown from is basically the same as that of the first embodiment, and the description thereof is omitted. However, in the first embodiment, in the blow molding method, if the tip of the parison passes, the air from the air outlet 41 may be stopped, but in the present embodiment, the parison 6 is used.
The air must be continuously blown out from the air outlet 41 until the end of the pushing. If the air from the air outlet 41 is stopped before the pushing of the parison 6 is finished, the parison 6 (the portion B in FIG. 2) that has been dripping may hang down, and the convex portion 3 may break or damage the parison 6. Because. The blow molding method and blow molding die configured as described above also obtain the same operation and effect as in the first embodiment.

【0020】尚、本発明においては、前記実施形態に示
すものに限られず、目的,用途に応じて本発明の範囲で
種々変更できる。凹部分2,凸部分3,エア吹出し口4
1,導管4,金型Mの形状,大きさ等は適宜選択でき
る。
The present invention is not limited to the embodiment described above, but can be variously modified within the scope of the present invention depending on the purpose and application. Concave portion 2, convex portion 3, air outlet 4
1, the shape of the conduit 4, the mold M, the size, etc. can be appropriately selected.

【0021】[0021]

【発明の効果】以上のごとく、本発明のブロー成形方法
及びブロー成形型は、キャビティ面に凹部分や凸部分が
あっても、円滑に成形でき、更に、従来、凹部分や凸部
分によって制限を受けていたパリソン径を大きくして、
生産性向上,品質安定を図れるなど優れた効果を発揮す
る。
As described above, the blow molding method and blow molding die of the present invention can be smoothly molded even if there are concave portions or convex portions on the cavity surface, and are conventionally limited by the concave portions and convex portions. I increased the parison diameter that was receiving,
It exhibits excellent effects such as improved productivity and stable quality.

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

【図1】実施形態1で、キャビティ面に形成された成形
品形状の凹部分がある金型の部分拡大断面図である。
FIG. 1 is a partially enlarged cross-sectional view of a mold according to a first embodiment, which includes a molded product-shaped concave portion formed on a cavity surface.

【図2】実施形態2で、キャビティ面に突き出る凸部分
が設けられた金型の部分拡大断面図である。
FIG. 2 is a partially enlarged cross-sectional view of a mold according to a second embodiment, in which a convex portion protruding from a cavity surface is provided.

【図3】従来技術の概略説明図である。FIG. 3 is a schematic explanatory diagram of a conventional technique.

【図4】従来技術の説明断面図である。FIG. 4 is an explanatory cross-sectional view of a conventional technique.

【符号の説明】[Explanation of symbols]

1 キャビティ面 2,2a 凹部分 3 凸部分 4 導孔 41 エア吹出し口 5 ダイヘッド 6 パリソン M 金型 S 成形品 1 Cavity surface 2, 2a Recessed portion 3 Convex portion 4 Guide hole 41 Air outlet 5 Die head 6 Parison M Mold S Molded product

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 金型のキャビティ面に形成された成形品
形状の凹部分に対し、該凹部分の上側に位置するキャビ
ティ面にエア吹出し口を設け、該エア吹出し口から空気
を吹き出しながら、ダイヘッドより押し出されたパリソ
ンを金型のキャビティ面に沿わせて降下させるようにし
たことを特徴とするブロー成形方法。
1. An air blowout port is provided on a cavity surface located above the recessed portion with respect to a recessed portion of a molded product formed on a cavity surface of a mold, and air is blown from the air blowout port, A blow molding method characterized in that a parison extruded from a die head is lowered along a cavity surface of a mold.
【請求項2】 金型のキャビティ面に突き出る凸部分に
対し、該凸部分の上側に位置するキャビティ面にエア吹
出し口を設け、該エア吹出し口から空気を吹出しなが
ら、ダイヘッドより押し出されたパリソンを金型のキャ
ビティ面に沿わせて降下させるようにしたことを特徴と
するブロー成形方法。
2. A parison that is extruded from a die head while air is blown from the air blowout port provided on the cavity face located above the convex part with respect to the convex part protruding to the cavity face of the mold. The blow molding method is characterized in that the mold is lowered along the cavity surface of the mold.
【請求項3】 前記凸部分がインサートである請求項2
に記載のブロー成形方法。
3. The convex portion is an insert.
The blow molding method according to 1.
【請求項4】 キャビティ面に設けられた凹部分又は凸
部分に対し、該凹部分又は凸部分の上側に位置するキャ
ビティ面にエア吹出し口を有して型内を貫通する導孔が
形成されるようにしたブロー成形型。
4. A guide hole penetrating through a mold having an air outlet on a cavity surface located above the depression or projection with respect to the depression or projection provided on the cavity surface. Blow molding die.
JP14541796A 1996-06-07 1996-06-07 Blow molding and blow molding die Pending JPH09323352A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14541796A JPH09323352A (en) 1996-06-07 1996-06-07 Blow molding and blow molding die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14541796A JPH09323352A (en) 1996-06-07 1996-06-07 Blow molding and blow molding die

Publications (1)

Publication Number Publication Date
JPH09323352A true JPH09323352A (en) 1997-12-16

Family

ID=15384777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14541796A Pending JPH09323352A (en) 1996-06-07 1996-06-07 Blow molding and blow molding die

Country Status (1)

Country Link
JP (1) JPH09323352A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102107523A (en) * 2010-11-10 2011-06-29 宁波方正汽车模具有限公司 Horizontal type blow molding die for automobile oil tube and blow molding method thereof
JP2016043564A (en) * 2014-08-22 2016-04-04 株式会社Fts Blow molding method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102107523A (en) * 2010-11-10 2011-06-29 宁波方正汽车模具有限公司 Horizontal type blow molding die for automobile oil tube and blow molding method thereof
JP2016043564A (en) * 2014-08-22 2016-04-04 株式会社Fts Blow molding method

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