JPS634495B2 - - Google Patents
Info
- Publication number
- JPS634495B2 JPS634495B2 JP56059273A JP5927381A JPS634495B2 JP S634495 B2 JPS634495 B2 JP S634495B2 JP 56059273 A JP56059273 A JP 56059273A JP 5927381 A JP5927381 A JP 5927381A JP S634495 B2 JPS634495 B2 JP S634495B2
- Authority
- JP
- Japan
- Prior art keywords
- overhang
- parison
- mold
- local
- molded product
- 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
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
- B29C49/4242—Means for deforming the parison prior to the blowing operation
- B29C49/4247—Means for deforming the parison prior to the blowing operation using spreading or extending means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、プラスチツク製品のブロー成形方法
に関するもので、詳しくは、ブロー成形後に切断
して使用される局部的張出部を有するブロー成形
品を、その局部的張出部に偏肉が発生しないよう
に成形する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blow molding method for plastic products, and more specifically, the present invention relates to a blow molding method for plastic products, and more specifically, a blow molded product having a local overhang, which is cut and used after blow molding, is The present invention relates to a method for forming parts so that uneven thickness does not occur in the parts.
たとえば、第１図および第２図にみられるよう
に、金管楽器や工具等を収納するプラスチツク製
のケースで、局部的張出部ａを必要とする場合、
偏肉が大きいと、その張出部ａが薄肉となつて剛
性不足となる。 For example, as shown in Figures 1 and 2, when a plastic case for storing brass instruments, tools, etc. requires a localized protrusion a,
If the thickness deviation is large, the overhanging portion a becomes thin and lacks rigidity.
一般に、これらのケース類の成形は、真空成
形、つまり、シートを型の上にクランプしたまま
加熱軟化させて型とシートとの間隙を真空にして
シートを型に密着させて成形し、冷却後に真空を
きつて成形品を取り出す方法と、圧空成形、つま
り、加熱して軟化したシートをクランプし、圧縮
空気の力でシートを引伸ばして型に沿わせ、成形
品を得る方法の２つの方法が多く用いられてい
る。 Generally, these cases are formed by vacuum forming, that is, the sheet is clamped onto a mold and heated and softened, the gap between the mold and the sheet is evacuated, the sheet is molded in close contact with the mold, and then cooled and then molded. There are two methods: one is to tighten the vacuum to take out the molded product, and the other is to use pressure forming, in other words, to clamp a heated and softened sheet and use the force of compressed air to stretch the sheet to fit the mold to obtain a molded product. is often used.
しかし、これらの従来の方法では、偏肉防止を
しようとしても、絞り込み量に限界があり、した
がつて、偏肉防止にパリソン制御装置を使用して
も難かしい。すなわち、第１図および第２図に示
すように、片側に局部的張出部ａがある場合、分
割点数の多いパリソン制御装置を用いてブロー成
形すると偏肉は少なくなるが、パリソン制御装置
は、パリソンの押出方向の肉厚変化を与えるもの
であることにより、局部的張出部ａのない側に不
用の樹脂を使用することになり樹脂費用が嵩むこ
とになる。なお第１図および第２図において、ｂ
はパーテングライン、つまり、金型の合せ面であ
る。 However, with these conventional methods, there is a limit to the amount of narrowing even when trying to prevent uneven thickness, and therefore it is difficult to use a parison control device to prevent uneven thickness. In other words, as shown in FIGS. 1 and 2, when there is a local overhang a on one side, blow molding using a parison control device with a large number of division points will reduce uneven thickness, but the parison control device , since the thickness of the parison is changed in the extrusion direction, unnecessary resin is used on the side where there is no local overhang a, which increases the resin cost. In addition, in Figures 1 and 2, b
is the parting line, that is, the mating surface of the mold.
第３図はパリソンｃを金型ｄとｅで挾み、内圧
を加えて成形した場合の従来法による成形品の張
出部ａの肉厚分布を示したもので、局部的張出部
ａに偏肉を生じ、非常に薄肉となつて剛性不足と
なる。 Figure 3 shows the wall thickness distribution of the overhang part a of the molded product by the conventional method when parison c is sandwiched between molds d and e and molded by applying internal pressure. This causes uneven thickness, resulting in a very thin wall and lack of rigidity.
本発明は、ブロー成形後に切断して使用される
ブロー成形品の局部的張出部の偏肉が生じないブ
ロー成形方法を提供することを目的とするもので
ある。このため、本発明では、前記成形品の該張
出部の形状より適当に小さい相似形をしたパリソ
ン張出板を、パリソン内にその局部的張出部に対
峙させてから型締めを行ない、そののち、前記パ
リソン内に空気を吹込んでその局部的張出部に偏
肉が発生しないように成形することを特徴とする
もので、その一実施例について、第４図ないし第
６図を参照しながら説明する。 An object of the present invention is to provide a blow molding method that does not cause unevenness in the thickness of local overhangs of a blow molded product that is cut and used after blow molding. Therefore, in the present invention, a parison overhang plate having a similar shape that is suitably smaller than the shape of the overhang of the molded product is placed inside the parison to face the local overhang, and then the mold is clamped. After that, air is blown into the parison to form the parison so that uneven thickness does not occur in the local protruding portion. For an example thereof, see FIGS. 4 to 6. I will explain while doing so.
第４図ないし第６図は第１図および第２図に示
した局部的張出部ａの偏肉を防止するため、金型
１の局部的張出部の円弧形状より２〜３センチメ
ートル小さい円弧状のパリソン張出部３は設けた
場合の例で、第４図および第５図は内圧を加えて
パリソンが金型１と２の面に密着した状態を示し
た断面図であり、第６図はその前工程を示した説
明図である。すなわち、第６図にみられるよう
に、まず、パリソン張出板３を保持金具４に固定
し、ブローピン５に挿入する。なおこれら部品は
キー等で位置が決まるようにされている。つぎ
に、局部的張出部を有する前記金型１のＡ位置に
該張出板３を対峙させる。そして、ブロー成形機
のブローノズル６からパリソン７および８を所定
の長さに押出す。すると、該張出板３はパリソン
７および８の内部に位置し、該張出板３の円弧部
分はパリソン７と接触している。この状態で金型
１と２を閉じるとき、該張出板３と接触している
部分は金型１に押込まれ、ほぼパリソン肉厚が保
持される。そこで、ブローピン５から空気を吹込
み、内圧が加えられると、パリソン７は該張出板
３からはなれ、金型１の壁面まで移動する。この
変位が小さいほど薄肉化が阻止される。第４図に
みられるように、該張出板３の円弧の終端Ｂは金
型１の局部的張出部の終端Ｃと同じレベルとす
る。上記手順により得られた成形品９を金型１と
２から取出し、ブローピン５を抜き出し、切断す
ることにより、保持金具４で固定された前記張出
板３を取出す。切断されたその成形品がケースの
素材となる。なお第４図および第５図において、
１０はパーテングライン、つまり、金型１と２の
合せ面である。 4 to 6 are 2 to 3 centimeters from the arcuate shape of the local overhang of the mold 1 in order to prevent uneven thickness of the local overhang a shown in FIGS. 1 and 2. This is an example in which a small arc-shaped parison overhang 3 is provided, and FIGS. 4 and 5 are cross-sectional views showing a state in which the parison is brought into close contact with the surfaces of the molds 1 and 2 by applying internal pressure. FIG. 6 is an explanatory diagram showing the pre-process. That is, as shown in FIG. 6, first, the parison projecting plate 3 is fixed to the holding fitting 4 and inserted into the blow pin 5. Note that the positions of these parts are determined by keys or the like. Next, the overhanging plate 3 is made to face the A position of the mold 1 having the local overhang. Then, the parisons 7 and 8 are extruded to a predetermined length from the blow nozzle 6 of the blow molding machine. Then, the overhang plate 3 is located inside the parisons 7 and 8, and the arc portion of the overhang plate 3 is in contact with the parison 7. When the molds 1 and 2 are closed in this state, the portion in contact with the overhanging plate 3 is pushed into the mold 1, and the parison wall thickness is maintained approximately. Then, when air is blown through the blow pin 5 and internal pressure is applied, the parison 7 separates from the projecting plate 3 and moves to the wall surface of the mold 1. The smaller this displacement is, the more thinning is prevented. As shown in FIG. 4, the end B of the arc of the overhang plate 3 is at the same level as the end C of the local overhang of the mold 1. The molded product 9 obtained by the above procedure is taken out from the molds 1 and 2, the blow pin 5 is taken out and cut, and the overhanging plate 3 fixed with the holding fitting 4 is taken out. The cut molded product becomes the material for the case. In addition, in FIGS. 4 and 5,
10 is a parting line, that is, a mating surface of molds 1 and 2.
第７図はパリソン張出板３′の円弧の終端Ｂと
金型１の局部的張出部の終端Ｃのレベルが異なつ
た場合で、この場合はＤ部が薄肉となり、したが
つて、適当でない。 Fig. 7 shows a case where the level of the end B of the arc of the parison overhang plate 3' and the end C of the local overhang of the mold 1 are different. Not.
なお第４図に示した実施例では、パリソン張出
板３が円弧状になつているが、これは成形品の局
部的張出部ａが円弧状であるためで、もし、局部
的張出部ａが他の形状であれば、該張出板３の形
状も、それに相似する適当に小さい形状となる。 In the embodiment shown in FIG. 4, the parison overhang plate 3 has an arc shape, but this is because the local overhang part a of the molded product is in an arc shape. If part a has another shape, the shape of the overhang plate 3 will also be a suitably small shape similar to it.
上述のように、本発明は、成形品の局部的張出
部の形状よりも適当に小さい相似形をしたパリソ
ン張出板を、パリソン内で金型の局部的張出部に
対峙させてから型締めを行ない、そののち、前記
パリソン内に空気を吹込んで成形するから、その
型締めのとき、該張出板に接触しているパリソン
の部分が金型に押込まれて局部的張出部のパリソ
ン肉厚が保持され、したがつて、ブロー成形品の
局部的張出部の偏肉が確実に防止される。 As described above, in the present invention, a parison overhang plate having a similar shape that is suitably smaller than the shape of the local overhang of the molded product is made to face the local overhang of the mold within the parison, and then The mold is clamped, and then air is blown into the parison to form the mold, so when the mold is clamped, the part of the parison that is in contact with the overhang plate is pushed into the mold, creating a local overhang. The thickness of the parison is maintained, and uneven thickness of local overhangs of the blow-molded product is therefore reliably prevented.
第１図は局部的張出部を有するブロー成形品の
一例を示した平面図、第２図は第１図の正面図、
第３図は従来の方法の一例を示した断面図、第４
図は本発明の一実施例を示した断面平面図、第５
図は第４図の断面正面図、第６図は第４図および
第５図に示す状態にするための前工程の説明図、
第７図は好ましくない状態を示した説明図であ
る。
ａ……ブロー成形品の局部的張出部、ｂ……パ
ーテングライン、１，２……金型、３……パリソ
ン張出板、４……保持金具、５……ブローピン、
６……ブローノズル、７，８……パリソン、９…
…ブロー成形品、１０……パーテイングライン。
FIG. 1 is a plan view showing an example of a blow-molded product having a local protrusion, FIG. 2 is a front view of FIG. 1,
Figure 3 is a sectional view showing an example of the conventional method;
The figure is a cross-sectional plan view showing one embodiment of the present invention.
The figure is a cross-sectional front view of FIG. 4, and FIG. 6 is an explanatory diagram of the pre-process to achieve the state shown in FIGS. 4 and 5.
FIG. 7 is an explanatory diagram showing an unfavorable state. a... Local protrusion of blow molded product, b... Parting line, 1, 2... Mold, 3... Parison protruding plate, 4... Holding metal fitting, 5... Blow pin,
6...Blow nozzle, 7, 8...Parison, 9...
...Blow molded product, 10... Parting line.
Claims (1)
出部を有するブロー成形品を成形する方法におい
て、前記成形品の該張出部の形状よりも適当に小
さい相似形をしたパリソン張出板を、パリソン内
で金型の局部的張出部に対峙させてから型締めを
行ない、そののち、前記パリソン内に空気を吹込
んでその局部的張出部に偏肉が発生しないように
成形することを特徴とする、プラスチツク製品の
ブロー成形方法。1. In a method of molding a blow molded product having a local overhang that is cut and used after blow molding, a parison overhang plate having a similar shape that is suitably smaller than the shape of the overhang of the molded product is used. , the mold is clamped after facing the local overhang of the mold within the parison, and then air is blown into the parison to form the mold so that uneven thickness does not occur at the local overhang. A blow molding method for plastic products, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56059273A JPS57174217A (en) | 1981-04-21 | 1981-04-21 | Blow molding method for plastic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56059273A JPS57174217A (en) | 1981-04-21 | 1981-04-21 | Blow molding method for plastic product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57174217A JPS57174217A (en) | 1982-10-26 |
| JPS634495B2 true JPS634495B2 (en) | 1988-01-29 |
Family
ID=13108600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56059273A Granted JPS57174217A (en) | 1981-04-21 | 1981-04-21 | Blow molding method for plastic product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57174217A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0643012U (en) * | 1992-11-12 | 1994-06-07 | 象印マホービン株式会社 | Water bridge |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5511846A (en) * | 1978-07-13 | 1980-01-28 | Showa Yuka Kk | Method of forming hollow formed article with insert |
| JPS55152032A (en) * | 1979-05-17 | 1980-11-27 | Sekisui Chem Co Ltd | Preparation of hollow molded article having thermoplastic resin foamed layer |
-
1981
- 1981-04-21 JP JP56059273A patent/JPS57174217A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0643012U (en) * | 1992-11-12 | 1994-06-07 | 象印マホービン株式会社 | Water bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57174217A (en) | 1982-10-26 |
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