JP3061241B2 - Mold for blow molding - Google Patents
Mold for blow moldingInfo
- Publication number
- JP3061241B2 JP3061241B2 JP6160056A JP16005694A JP3061241B2 JP 3061241 B2 JP3061241 B2 JP 3061241B2 JP 6160056 A JP6160056 A JP 6160056A JP 16005694 A JP16005694 A JP 16005694A JP 3061241 B2 JP3061241 B2 JP 3061241B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- parison
- heat
- resin film
- cavity
- 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 - Lifetime
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
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明はブロー成形用金型に係
り、特に成形品の表面性向上を図るようにした金型に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for blow molding, and more particularly to a mold for improving the surface properties of a molded product.
【0002】[0002]
【従来の技術】従来のブロー成形方法は、ダイスよりパ
リソンを押出し、パリソンピンチによって袋状にされた
パリソンにプリブローを行って僅かに膨らませた後、型
締装置によって左右の金型を閉じるようにしている。金
型が閉じると同時あるいはその直前にキャビティ内のガ
スを抜くとともに、パリソン内に高圧吹込みを行ってキ
ャビティに密着させ、金型にて冷却成形するようになっ
ている。成形後は金型を開き、製品を取り出して成形1
サイクルが完了する。2. Description of the Related Art In a conventional blow molding method, a parison is extruded from a die, a parison formed into a bag by a parison pinch is pre-blown, slightly inflated, and the left and right dies are closed by a mold clamping device. ing. Simultaneously with or immediately before the mold is closed, the gas in the cavity is evacuated, and a high pressure is blown into the parison so that the parison is brought into close contact with the cavity, and the mold is cooled and molded. After molding, open the mold, take out the product, and mold 1
The cycle is completed.
【0003】ところで、パリソンは金型キャビティに密
着して所定の形状とされるが、従来の成形方法では、1
サイクル中、金型はパリソンが十分冷却されて成形品と
して取り出せる十分に低い温度に設定されており、通常
この温度を一定に保つようにしている。[0003] The parison has a predetermined shape in close contact with the mold cavity.
During the cycle, the mold is set at a sufficiently low temperature that the parison is sufficiently cooled and can be removed as a molded article, usually keeping this temperature constant.
【0004】[0004]
【発明が解決しようとする課題】ところが、ブロー成形
品は射出成形のように高圧力をかけて成形を行わないた
めに、成形品の表面性状が悪いといった欠点がある。表
面性状を改善するために金型表面温度を樹脂の軟化点
(ガラス転移点または結晶化温度)以上に加熱すること
もあるが、その結果成形サイクルが長くなってしまうと
いう相反する問題が発生してしまう。However, blow molded articles have the disadvantage that the surface properties of the molded articles are poor because molding is not performed by applying high pressure as in injection molding. In order to improve the surface properties, the mold surface temperature may be heated to above the softening point (glass transition point or crystallization temperature) of the resin, but as a result, there is a contradictory problem that the molding cycle becomes longer. Would.
【0005】本発明の目的は、上記従来の問題点に着目
し、表面性状の良好なブロー成形品を短いサイクルで効
率的に生産することができるブロー成形用金型を提供す
ることにある。An object of the present invention is to provide a blow molding die capable of efficiently producing a blow molded product having good surface properties in a short cycle by focusing on the above-mentioned conventional problems.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係るブロー成形用金型は、熱可塑性樹脂の
中空成形用金型において、前記金型の母材を低熱容量の
材質で形成し、前記金型母材の内部に温調用媒体通路を
形成するとともに、前記金型のキャビティ表面に縦横に
連通した井桁状の溝部を設け、前記キャビティ表面に開
空孔径1mm以下で開空孔密度1個/cm2以上の細孔
を有した耐熱性樹脂フィルムを貼着した。In order to achieve the above object, a blow molding die according to the present invention is a blow molding die made of thermoplastic resin, wherein a base material of the die is made of a material having a low heat capacity. And forming a temperature control medium passage inside the mold base material, and vertically and horizontally on the cavity surface of the mold.
A continuous girder-shaped groove was provided, and a heat-resistant resin film having pores with an open pore diameter of 1 mm or less and an open pore density of 1 / cm 2 or more was attached to the cavity surface.
【0007】[0007]
【作用】金型の通常待機状態で温調用の媒体を循環させ
所望の温度に昇温させておき、次いで、ダイスよりパリ
ソンを押出し金型間に挟持、型締する。この後高圧吹込
みに移動するが、パリソンとキャビティ表面に貼着した
耐熱性樹脂フィルム間の残留エアを強制排出させながら
高圧吹込みによってパリソンを断熱性の高い耐熱性樹脂
フィルムに押圧することで高表面性の成形品を得る。In a normal standby state of the mold, a medium for temperature control is circulated to raise the temperature to a desired temperature, and then a parison is extruded from a die, clamped between the molds, and clamped. After that, it moves to high-pressure blowing, but by pressing the parison against the heat-insulating resin film with high heat insulation while forcibly discharging residual air between the parison and the heat-resistant resin film attached to the cavity surface. Obtain molded products with high surface properties.
【0008】[0008]
【実施例】以下に、本発明に係るブロー成形用金型の具
体的実施例を図面を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the blow molding die according to the present invention will be described in detail with reference to the drawings.
【0009】実施例に係るブロー成形用金型10の構成
図を図1に示す。この金型10は左右一対の金型10
R、10Lによって構成されるとともに、型合わせ面に
キャビティ12(12R、12L)を形成し、図示しな
いダイスから射出されたパリソンを挟み込み、パリソン
内部にエアブローを行うことにより、型合わせによって
形成される密閉キャビティに一致する中空容器を成形す
るようにしている。FIG. 1 shows a configuration diagram of a blow molding die 10 according to an embodiment. The mold 10 includes a pair of left and right molds 10.
R, 10L, and a cavity 12 (12R, 12L) is formed on the mold-matching surface, a parison ejected from a die (not shown) is sandwiched, and air is blown into the parison to form the mold. A hollow container corresponding to the closed cavity is formed.
【0010】このような金型10における金型本体14
(14R、14L)はアルミニウム材料の鋳造品として
形成されているが、当該実施例では各金型本体14R、
14Lのキャビティ12R、12L面上に図3、図4に
示すような井桁状の溝16(16R、16L)が設けら
れている。The mold body 14 in such a mold 10
(14R, 14L) are formed as castings of aluminum material, but in this embodiment, each mold body 14R,
On the surfaces of the cavities 12R and 12L of the 14L, the girder-shaped grooves 16 (16R and 16L) are provided as shown in FIGS.
【0011】この井桁状の溝16の深さおよび幅は約1
mm程度、溝16の間隔は例えば約50mmとされ縦横
に連通した構成となっている。The depth and width of the girder-shaped groove 16 are about 1
For example, the distance between the grooves 16 is about 50 mm, and the grooves 16 communicate vertically and horizontally.
【0012】また当該実施例では、図2に示すようにキ
ャビティ12面上に、耐熱性樹脂フィルム18(18
R、18L)が貼着してある。この耐熱性樹脂フィルム
18としては、例えばポリイミド樹脂、ポリエーテルイ
ミド樹脂、ポリアミドイミド樹脂、ポリスルフォン樹脂
やフッ素樹脂などが好適であり、パリソンを両金型本体
14R、14Lで挟持して、パリソンが金型キャビティ
12に密着した時、耐熱性樹脂フィルム18が低熱伝導
率のためパリソンの保有熱が金型本体14R、14Lに
伝熱されにくく、パリソンの温度が低下しにくい断熱材
としての役目を有するようになっている。In this embodiment, as shown in FIG. 2, a heat-resistant resin film 18 (18
R, 18L). As the heat-resistant resin film 18, for example, a polyimide resin, a polyetherimide resin, a polyamideimide resin, a polysulfone resin, a fluororesin, or the like is preferable, and the parison is sandwiched between the mold bodies 14R and 14L. When the heat-resistant resin film 18 is in close contact with the mold cavity 12, the heat of the parison is hardly transferred to the mold bodies 14R and 14L due to the low thermal conductivity, so that the parison serves as a heat insulating material that does not easily lower the temperature of the parison. To have.
【0013】この耐熱性樹脂フィルム18は10μm〜
500μmの範囲の厚さが概ねの目安である。そして耐
熱性樹脂フィルム18には例えば開空孔径1mm以下、
好ましくは約0.05〜0.3mmの開空孔径が開空孔
密度1個/cm2 以上となるように開口された構成とな
っている。The heat-resistant resin film 18 has a thickness of 10 μm or less.
A thickness in the range of 500 μm is a rough guide. The heat-resistant resin film 18 has, for example, an open hole diameter of 1 mm or less,
Preferably, the opening is formed such that the open hole diameter of about 0.05 to 0.3 mm has an open hole density of 1 / cm 2 or more.
【0014】耐熱性樹脂フィルム18の開空孔15は打
抜き、穴あけ加工するかYAGレーザ、エキシマレーザ
などで開孔することが可能である。また、耐熱性樹脂フ
ィルム18を金型本体14に貼着するには焼付法などで
取付けるか接着剤を貼付するなど適宜な方法で行えばよ
い。The open holes 15 of the heat-resistant resin film 18 can be punched, punched, or opened with a YAG laser, an excimer laser, or the like. The heat-resistant resin film 18 may be attached to the mold body 14 by an appropriate method such as attachment by a baking method or an adhesive.
【0015】金型本体14内のキャビティ12近傍には
キャビティ12の表面に沿うように複数のキリ穴を穿孔
しあるいは銅パイプを鋳込むことにより形成された温調
用媒体通路19が設けられている。この温調用媒体通路
19には供給源から温調媒体である油、水、スチームな
どを供給するようにしている。In the vicinity of the cavity 12 in the mold body 14, a temperature control medium passage 19 formed by drilling a plurality of drilled holes or casting a copper pipe along the surface of the cavity 12 is provided. . The temperature control medium passage 19 is supplied with a temperature control medium such as oil, water, and steam from a supply source.
【0016】この温調用媒体通路19はキャビティ12
の表面に倣うように蛇行形成され、その一端側から温調
媒体を導入し、他端側から排出するようにし、温調媒体
を供給することによって金型本体14を加熱するのであ
る。The temperature control medium passage 19 is provided in the cavity 12.
The mold body 14 is heated by introducing the temperature control medium from one end thereof, discharging the temperature control medium from the other end side, and supplying the temperature control medium.
【0017】図1に示すように前記温調用媒体通路19
に温調媒体を通流可能なように、各金型本体14R、1
4Lの底板部と天板部には温調用媒体供給口20と温調
用媒体吐出口22とを穿設し、金型本体14の外部に設
置された媒体温調装置30へは配管26を接続してあ
る。As shown in FIG. 1, the temperature control medium passage 19
Each mold body 14R, 1
A temperature control medium supply port 20 and a temperature control medium discharge port 22 are formed in the 4L bottom plate section and the top plate section, and a pipe 26 is connected to a medium temperature control apparatus 30 installed outside the mold body 14. I have.
【0018】このように構成されたブロー成形用金型を
用いたブロー成形作業は次のように行われる。The blow molding operation using the blow mold thus constructed is performed as follows.
【0019】金型本体14を成形品の取出が可能な十分
に低い温度で、かつ表面性が得られる十分に高い温度範
囲に(樹脂の種類によって異なるが、例えば85〜14
5℃)加熱しておき、ダイス(図示なし)からパリソン
の押出を開始させ、プリピンチ、プリブロー、型締を行
う。The temperature of the mold body 14 is set at a sufficiently low temperature at which a molded product can be removed and at a sufficiently high temperature range at which surface properties can be obtained (for example, 85 to 14 depending on the type of resin).
(5 ° C.), and the parison is extruded from a die (not shown) to perform pre-pinch, pre-blow, and mold clamping.
【0020】型締に引続く高圧吹込みによってパリソン
がキャビティ12の表面に貼着された耐熱性樹脂フィル
ム18側へ押圧されるが、この時図4に示すように型閉
に入ると同時に溝16内に滞留する残留エアを真空ポン
プ(図示なし)によって吸引排出するか、または図3に
示すようにパリソンが耐熱性樹脂フィルム18を押圧す
ることでパリソンと金型の間の残留エアを溝16を介し
て四方八方に開放された溝16の端部から大気中へ放出
するようにするのである。The parison is pressed against the heat-resistant resin film 18 adhered to the surface of the cavity 12 by high-pressure blowing following mold clamping. At this time, as shown in FIG. The residual air remaining in the mold 16 is sucked and discharged by a vacuum pump (not shown), or the parison presses the heat-resistant resin film 18 to form the residual air between the parison and the mold as shown in FIG. The air is released to the atmosphere from the end of the groove 16 which is opened in all directions through the space 16.
【0021】[0021]
【0022】パリソンは両金型本体14R、14L間に
挟持された時高圧吹込みによってパリソンがキャビティ
12の表面に押圧されるとパリソンの保有熱が両金型本
体14側へ伝熱するが、低熱伝導率の耐熱性樹脂フィル
ム18がキャビティ12の表面に貼着してあるので、パ
リソンから金型本体14への熱移動を遅らせることがで
きる。When the parison is sandwiched between the two mold bodies 14R and 14L and the parison is pressed against the surface of the cavity 12 by high-pressure blowing, the heat held by the parison is transferred to the two mold bodies 14; Since the heat-resistant resin film 18 having a low thermal conductivity is adhered to the surface of the cavity 12, heat transfer from the parison to the mold body 14 can be delayed.
【0023】その間にパリソンと耐熱性樹脂フィルム1
8間の残留エアを開空孔15→溝16部から金型本体1
4の外部へ真空ポンプ(図示なし)などで吸引排出する
ことができパリソンが耐熱性樹脂フィルム18に押圧・
密着され高表面転写性が確保される。金型本体14は樹
脂の軟化点以下に冷却されているので、金型本体14
R、14L間に挟持されたパリソンは固化し、成形品は
変形なく金型から取り出すことができる。In the meantime, the parison and the heat-resistant resin film 1
The residual air between 8 is opened from the opening hole 15 → the groove 16 to the mold body 1
4 of the vacuum pump to external pressing the parison can be sucked and discharged in a (shown teeth) or the like on the heat-resistant resin film 18,
Close contact ensures high surface transferability. Since the mold body 14 is cooled below the softening point of the resin, the mold body 14
The parison sandwiched between R and 14L solidifies, and the molded product can be taken out of the mold without deformation.
【0024】本実施例のブロー成形用金型本体14と従
来のアルミニウム製ブロー成形用金型との比較実験を行
った結果を表1に示す。Table 1 shows the results of a comparative experiment conducted between the blow molding die body 14 of this embodiment and a conventional aluminum blow molding die.
【0025】[0025]
【表1】 [Table 1]
【0026】表1に示すように本実施例では、金型本体
14の表面に低熱伝導率の耐熱性樹脂フィルム18を貼
着したことにより、金型本体14の温度を従来の金型よ
り低くでき、このため成形サイクルムも短くできる。ま
た、パリソンと耐熱性樹脂フィルム18間の残留エアを
強制排出できることにより光沢度90以上の高い表面転
写性が得られる。As shown in Table 1, in the present embodiment, the temperature of the mold body 14 is lower than that of the conventional mold by attaching the heat-resistant resin film 18 having a low thermal conductivity to the surface of the mold body 14. Therefore, the molding cycle can be shortened. Further, since the residual air between the parison and the heat-resistant resin film 18 can be forcibly discharged, a high surface transfer property having a glossiness of 90 or more can be obtained.
【0027】[0027]
【発明の効果】以上説明したことからも明らかなよう
に、熱可塑性樹脂の中空成形用金型において、前記金型
の母材を低熱容量の材質で形成し、前記金型母材の内部
に温調用媒体通路を形成するとともに、前記金型のキャ
ビティ表面に縦横に連通した井桁状の溝部を設け、前記
キャビティ表面に開空孔径1mm以下で開空孔密度1個
/cm2以上の細孔を有した耐熱性樹脂フィルムを貼着
したことにより、パリソン表面は細孔からパリソンと金
型の間の空気が排除されるまで固化しない温度以上に保
たれているので高表面性の成形品が得られる。From what has been above description, according to the present invention as is apparent, in the hollow mold of the thermoplastic resin, the base material of the die is formed of a material of a low heat capacity, the interior of the mold base material In addition to forming a temperature control medium passage in the cavity, a girder-shaped groove communicating vertically and horizontally is provided on the cavity surface of the mold, and the cavity surface has a pore diameter of 1 mm or less and a pore density of 1 hole / cm 2 or more. By attaching a heat-resistant resin film with holes, the parison surface is kept at a temperature above which it does not solidify until the air between the parison and the mold is removed from the pores. Is obtained.
【0028】また、耐熱性樹脂フィルムによってパリソ
ンの金型への熱の拡散を遅延できるため、金型温度は樹
脂が固化するに十分な温度に冷却させておくことができ
成形サイクルを短くするとともに、変形のない成形品を
得ることができる。In addition, since the heat diffusion of the parison into the mold can be delayed by the heat-resistant resin film, the mold temperature can be kept at a temperature sufficient to solidify the resin, and the molding cycle can be shortened. Thus, a molded product without deformation can be obtained.
【図1】実施例に係るブロー成形用金型の断面図であ
る。FIG. 1 is a sectional view of a blow molding die according to an embodiment.
【図2】同金型の要部断面拡大図である。FIG. 2 is an enlarged cross-sectional view of a main part of the mold.
【図3】本発明の実施例に係る同金型のキャビティ表面
の溝部を示す金型斜視図である。FIG. 3 is a perspective view of a mold showing a groove on a cavity surface of the mold according to the embodiment of the present invention.
【図4】発明の別の実施例であってキャビティ表面の溝
部を示す金型斜視図である。FIG. 4 is a perspective view of a mold showing another embodiment of the present invention, showing a groove on the surface of a cavity.
10(10R、10L) 金型 12(12R、12L) キャビティ 14(14R、14L) 金型本体 15 開空孔 16(16R、16L) 溝 18(18R、18L)耐熱性樹脂フィルム 19 温調用媒体通路 20 温調用媒体供給口 22 温調用媒体吐出口 26 配管 30 媒体温調装置 Reference Signs List 10 (10R, 10L) Mold 12 (12R, 12L) Cavity 14 (14R, 14L) Mold body 15 Open hole 16 (16R, 16L) Groove 18 (18R, 18L) Heat-resistant resin film 19 Temperature control medium passage Reference Signs List 20 Temperature control medium supply port 22 Temperature control medium discharge port 26 Piping 30 Medium temperature control device
Claims (1)
て、前記金型の母材を低熱容量の材質で形成し、前記金
型母材の内部に温調用媒体通路を形成するとともに、前
記金型のキャビティ表面に縦横に連通した井桁状の溝部
を設け、前記キャビティ表面に開空孔径1mm以下で開
空孔密度1個/cm2以上の細孔を有した耐熱性樹脂フ
ィルムを貼着したことを特徴とするブロー成形用金型。1. A mold for hollow molding of a thermoplastic resin, wherein a base material of the mold is formed of a material having a low heat capacity, a medium control medium passage is formed inside the mold base material, and the mold is formed. A girder-shaped groove portion communicating vertically and horizontally was provided on the cavity surface of the mold, and a heat-resistant resin film having pore diameters of 1 mm or less and pore density of 1 hole / cm 2 or more was attached to the cavity surface. A blow molding die, characterized in that:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6160056A JP3061241B2 (en) | 1994-07-12 | 1994-07-12 | Mold for blow molding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6160056A JP3061241B2 (en) | 1994-07-12 | 1994-07-12 | Mold for blow molding |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0825468A JPH0825468A (en) | 1996-01-30 |
JP3061241B2 true JP3061241B2 (en) | 2000-07-10 |
Family
ID=15706959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6160056A Expired - Lifetime JP3061241B2 (en) | 1994-07-12 | 1994-07-12 | Mold for blow molding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3061241B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017124592A (en) * | 2016-01-17 | 2017-07-20 | 有限会社スワニー | Forming block and production method thereof |
-
1994
- 1994-07-12 JP JP6160056A patent/JP3061241B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0825468A (en) | 1996-01-30 |
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