JP4495820B2 - Blow molding method of amorphous thermoplastic resin - Google Patents
Blow molding method of amorphous thermoplastic resin Download PDFInfo
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- JP4495820B2 JP4495820B2 JP2000055144A JP2000055144A JP4495820B2 JP 4495820 B2 JP4495820 B2 JP 4495820B2 JP 2000055144 A JP2000055144 A JP 2000055144A JP 2000055144 A JP2000055144 A JP 2000055144A JP 4495820 B2 JP4495820 B2 JP 4495820B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、光沢面や塗装用下地面などの表面特性の優れた中空成形品を製造することができる非晶性熱可塑性樹脂のブロー成形方法に関するものである。
【０００２】
【従来の技術】
光沢面を有する中空成形品を製造するためのブロー成形方法としては、次に説明する（イ）および（ロ）等のブロー成形方法が知られている。
【０００３】
（イ）型開きされた金型のキャビティ表面温度を熱可塑性樹脂のビカット軟化温度以上の温度に加熱しておき、この温度を維持した状態で金型間にパリスンを配置したのち型閉じしてパリスンを狭持し、ついで加圧流体を導入してパリスンを膨張させてキャビティ表面に接触させたのち、前記キャビティ表面温度をビカット軟化温度−１０℃以下の温度まで冷却する、いわゆるホットスタート法（特開平７−１０８５３４号公報）。
【０００４】
（ロ）型開きされた金型のキャビティ表面温度を熱可塑性樹脂のビカット軟化温度より低い温度に加熱（一次昇温）しておき、この温度を維持した状態で金型間にパリスンを配置したのち型閉じしてパリスンを狭持し、ついで加圧流体を導入してパリスンを膨張させてキャビティ表面に接触させ、キャビティ表面温度を熱可塑性樹脂のビカット軟化温度を越えるピーク温度に加熱（二次昇温）し、ついで熱可塑性樹脂のビカット軟化温度より低い温度まで冷却する、いわゆるクールスタート法（特開平７−１４５９号公報）。
【０００５】
【発明が解決しようとする課題】
上記従来の技術のうち、（イ）のホットスタート法では、パリスンと金型キャビティ表面との間に介在するエアーが残り、そのエアーの形状が中空成形品の表面に現出するいわゆるエアーマークが発生する。特に、外観良好な光沢面が要求されるスポイラー等の複雑な形状の中空成形品の場合には、外観良好な光沢面を有する中空成形品を得ることはできない。
【０００６】
また、（ロ）のクールスタート法では、エアーマークの発生を防止できるものの、金型のキャビティ表面温度をピーク温度にまで加熱する二次昇温の昇温幅が大きいために二次昇温時間が長くなり、ひいては成形サイクルが長時間になる。
【０００７】
本発明は上記従来の技術の有する問題点に鑑みてなされたものであって、成形サイクル時間を短縮することができるとともに、光沢面などの表面特性の優れた中空成形品を成形することができる非晶性熱可塑性樹脂のブロー成形方法を実現することを目的とするものである。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明の非晶性熱可塑性樹脂のブロー成形方法は、成形品の形状を賦型したキャビティを有する分割形式の金型を用い、型開きされた前記金型間に非晶性熱可塑性樹脂からなるパリスンを配置したのち型閉じし、ついで前記パリスン内に導入された加圧流体による内圧によって前記キャビティに沿う形状に膨張させたのち、前記金型中で冷却したのち型開きして成形品を取り出す非晶性熱可塑性樹脂のブロー成形方法において、前記キャビティの表面が鏡面または表面粗さが０．９〜９．０μｍの範囲以内でかつ平均山間隔が１０〜１５０μｍの範囲以内であり、前記キャビティの表面の温度を、前記型閉じ完了時点の型閉じ温度（Ｔ1）℃および前記加圧流体の導入中に前記型閉じ温度（Ｔ1）℃からピーク温度（Ｔ2）℃へ二次昇温させる金型加熱工程を備えており、しかも、前記ピーク温度（Ｔ2）℃を前記非晶性熱可塑性樹脂の熱変形温度（Ｔ0）℃＋３０℃以上とするとともに、該熱変形温度（Ｔ0）℃を超えるブロー成形可能な温度領域で、前記型閉じ温度（Ｔ1）℃から前記ピーク温度（Ｔ2）℃へ二次昇温させる昇温幅を５℃以上にすることを特徴とするものである。
【０００９】
また、キャビティの表面が鏡面または表面粗さが０．９〜９．０μｍの範囲以内でかつ平均山間隔が１０〜１５０μｍの範囲以内である粗面とする。
【００１０】
【発明の実施の形態】
上記クールスタート法において、成形サイクル時間が長時間になる原因としては、型閉じ完了時点におけるキャビティ表面温度を熱可塑性樹脂のビカット軟化温度よりも低い一次温度とし、前記ビカット軟化温度を跨ぐように二次昇温させてピーク温度に達するように金型を加熱しているため、前記一次温度から前記ピーク温度まで昇温するための温度差が大きいことが挙げられる。
【００１１】
そこで、繰り返し実験を行なった結果、成形品の形状を賦型したキャビティを有し、キャビティの表面が鏡面である金型を用いて非晶性熱可塑性樹脂をブロー成形する場合、非晶性熱可塑性樹脂の熱変形温度（Ｔ0 ）℃を基準とし、該熱変形温度（Ｔ0 ）℃を超えるブロー成形可能な温度領域で、型閉じ温度（Ｔ1 ）℃からピーク温度（Ｔ2 ）℃まで二次昇温させることにより、成形サイクル時間を短縮できるばかりでなく、エアーマークの現出しない外観良好な光沢面を有する中空成形品をブロー成形できることが判明した。
【００１２】
また、表面粗さが０．９〜９．０μｍの範囲以内でかつ平均山間隔が１０〜１５０μｍの範囲以内である粗面のキャビティをもつ金型を用いて非晶性熱可塑性樹脂をブロー成形する場合、非晶性熱可塑性樹脂の熱変形温度（Ｔ0 ）℃を基準とし、該熱変形温度（Ｔ0 ）℃を超えるブロー成形可能な温度領域で、型閉じ温度（Ｔ1 ）℃からピーク温度（Ｔ2 ）℃まで二次昇温させることにより、成形サイクル時間を短縮できるばかりでなく、エアーマークの現出しない金型転写性の優れた中空成形品をブロー成形でき、この金型転写性の優れた中空成形品は、その表面に塗装を施すときに表面を研磨することのない優れた表面特性が得られることも判明した。以下に実験結果について詳しく説明する。
【００１３】
なお本発明において、非晶性熱可塑性樹脂とは、ポリフェニレンオキサイド、ポリカーボネート、非晶性ポリアミド、ＡＢＳ樹脂、ポリサルホン、ポリエーテルサルホン、ポリアリレート、ポリエーテルイミド、ハイインパクトポリスチレン等、引張弾性率が２０００ｋｇ／ｃｍ2 となる温度が７５℃以上のもの、好ましくは８５℃以上のものである。
【００１４】
（実験例１）
スクリュ径９０ｍｍの押出機を備えたブロー成形機を用い、熱変形温度（Ｔ0 ）℃が８５℃のハイインパクトポリスチレン「Ａ＆Ｍスチレン（株）、グレード名４１５１」より光沢用パネル（縦：７００ｍｍ、横：３２０ｍｍ、高さ：２５ｍｍ、平均肉厚２．５ｍｍ）を下記成形工程によりブロー成形した。そして、得られたパネルから試験片を得てその表面の光沢度を計測することによって評価を行なった。その結果を表１に示す。
【００１５】
ここで、光沢度は、ＪＩＳＫ７１０５にしたがって、光沢度測定装置（（株）堀場製作所製 ＧＲＯＳＳ ＣＨＥＣＫＥＲ ＩＧ−３１０）によって計測した６０°鏡面光沢の値である。
【００１６】
なお、使用した金型のキャビティの表面は鏡面を有し、かつ、金型に内設された熱媒体流路に熱媒体を流すことによってキャビティ表面の温度を変化させることができる分割形式の金型を使用した。
【００１７】
（成形工程）
（１）型開きされた金型間にパリスンを押し出して配置する。
【００１８】
本工程において、次の（２）の型閉じ完了時点において、キャビティ表面の温度が型閉じ温度（Ｔ1 ）℃になるように金型加熱工程を開始する。
【００１９】
（２）上記（１）ののち、金型の型閉じを行なってパリスンを挟持するが、この型閉じ完了時点において、キャビティ表面の温度が型閉じ温度（Ｔ1 ）℃になるように昇温する。
【００２０】
（３）上記（２）ののち、パリスン内に加圧流体を導入してその内圧によりキャビティ表面に沿って膨張させ、この加圧流体の導入中にキャビティ表面の温度を、型閉じ温度（Ｔ1 ）℃からピーク温度（Ｔ2 ）℃まで二次昇温する。
【００２１】
（４）上記（３）ののち、金型中で熱変形温度より低い温度まで冷却したのち、型開きしてブロー成形されたパネルを取り出す。
【００２２】
【表１】
表１のサンプル１〜３から明らかなように、金型加熱工程において、型閉じ完了時点におけるキャビティ表面の温度である型閉じ温度（Ｔ1 ）℃がビカット軟化点以下の７０℃では、ピーク温度（Ｔ2 ）℃まで二次昇温させるための時間がかかり、ひいてはブロー成形サイクル時間が長くなってしまう。
【００２４】
表１のサンプル１〜９から明らかなように、光沢度が９０以上の外観良好な光沢面を得るには、金型加熱工程において、ピーク温度（Ｔ2 ）℃が１１５℃以上であることが必要条件となる。つまり、ピーク温度（Ｔ2 ）℃が非晶性熱可塑性樹脂であるハイインパクトポリスチレンの熱変形温度（Ｔ0 ）℃＋３０℃以上であることが必要条件となる。
【００２５】
表１のサンプル７〜１２から明らかなように、金型加熱工程において、ピーク温度（Ｔ2 ）℃が１１５℃以上であっても、二次昇温を行なわない場合は、光沢度が９０以上の外観良好な光沢面が得られない。
【００２６】
また、ピーク温度（Ｔ2 ）℃が１１５℃以上であっても、型閉じ温度（Ｔ1 ）℃との間に５℃以上の温度差が必要である。つまり、金型加熱工程において、型閉じ温度（Ｔ1 ）℃から５℃以上の昇温幅の二次昇温が必要条件となる。
【００２７】
（実験例２）
成形材料として、熱変形温度（Ｔ0 ）℃が９５℃のＡＢＳ樹脂「テクノポリマー（株）、グレード名ＹＭ２４４」を用いた以外は、実験例１と同様である。その結果を表２に示す。
【００２８】
【表２】
表２のサンプル２１〜２３から明らかなように、金型加熱工程において、型閉じ完了時点におけるキャビティ表面の温度、すなわち型閉じ温度（Ｔ1 ）℃がビカット軟化温度以下の８０℃では、ピーク温度（Ｔ2 ）℃まで二次昇温させるための時間がかかり、ひいてはブロー成形サイクル時間が長くなってしまう。
【００３０】
表２のサンプル２１〜３２から明らかなように、金型加熱工程において、光沢度が９０以上の外観良好な光沢面を得るには、ピーク温度（Ｔ2 ）℃が１２５℃以上であることが必要条件となる。つまり、ピーク温度（Ｔ2 ）℃が非晶性熱可塑性樹脂であるＡＢＳ樹脂の熱変形温度（Ｔ0 ）℃＋３０℃以上であることが必要条件となる。
【００３１】
表２のサンプル２８〜３２から明らかなように、ピーク温度（Ｔ2 ）℃が１２５℃以上であっても、二次昇温を行なわない場合は、光沢度が９０以上の外観良好な鏡面が得られない。
【００３２】
また、ピーク温度（Ｔ2 ）℃が１２５℃以上であっても、型閉じ温度（Ｔ1 ）℃との間に５℃の温度差が必要である。つまり、金型加熱工程において、型閉じ温度（Ｔ1 ）℃から５℃以上の二次昇温が必要条件となる。
【００３３】
【発明の効果】
本発明は上述のとおり構成されているので、次に記載するような効果を奏する。
【００３４】
キャビティの表面の温度を、型閉じ温度（Ｔ1 ）℃からピーク温度（Ｔ2 ）℃にまで二次昇温させるための所要時間が短時間ですみ、ひいてはブロー成形サイクル時間が短縮されて生産性が向上する。加えて、エアーマークのない光沢のある外観良好な光沢面を有する成形品を製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blow molding method of an amorphous thermoplastic resin capable of producing a hollow molded article having excellent surface characteristics such as a glossy surface and a coating base surface.
[0002]
[Prior art]
As blow molding methods for producing a hollow molded product having a glossy surface, blow molding methods such as (a) and (b) described below are known.
[0003]
(A) The cavity surface temperature of the opened mold is heated to a temperature equal to or higher than the Vicat softening temperature of the thermoplastic resin, and the mold is closed after placing the parison between the molds while maintaining this temperature. The so-called hot start method (nearly holding the parison, then introducing the pressurized fluid to expand the parison and bringing it into contact with the cavity surface, and then cooling the cavity surface temperature to a temperature equal to or lower than the Vicat softening temperature −10 ° C. ( JP-A-7-108534).
[0004]
(B) The cavity surface temperature of the opened mold is heated to a temperature lower than the Vicat softening temperature of the thermoplastic resin (primary temperature increase), and Paris is placed between the molds while maintaining this temperature. The mold is then closed to hold the parison, and then pressurized fluid is introduced to expand the parison to contact the cavity surface, and the cavity surface temperature is heated to a peak temperature exceeding the Vicat softening temperature of the thermoplastic resin (secondary The so-called cool start method (Japanese Patent Laid-Open No. 7-1459) in which the temperature is raised to a temperature lower than the Vicat softening temperature of the thermoplastic resin.
[0005]
[Problems to be solved by the invention]
Among the above conventional techniques, in the hot start method of (a), there is a so-called air mark in which air intervening between the parison and the mold cavity surface remains and the shape of the air appears on the surface of the hollow molded product. appear. In particular, in the case of a hollow molded product having a complicated shape such as a spoiler that requires a glossy surface having a good appearance, a hollow molded product having a glossy surface having a good appearance cannot be obtained.
[0006]
In addition, the (b) cool start method can prevent the occurrence of air marks, but the secondary temperature increase time is large because the temperature range of the secondary temperature increase that heats the mold cavity surface temperature to the peak temperature is large. Becomes longer and the molding cycle becomes longer.
[0007]
The present invention has been made in view of the above-described problems of the prior art, and can shorten the molding cycle time and can mold a hollow molded article having excellent surface characteristics such as a glossy surface. An object of the present invention is to realize a blow molding method of an amorphous thermoplastic resin.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the blow molding method of an amorphous thermoplastic resin according to the present invention uses a split mold having a cavity in which the shape of a molded product is formed, and the mold is opened between the molds opened. After placing the parison made of amorphous thermoplastic resin, the mold is closed, then expanded to the shape along the cavity by the internal pressure of the pressurized fluid introduced into the parison, and then cooled in the mold In a blow molding method of an amorphous thermoplastic resin in which a molded product is taken out by opening a mold, the surface of the cavity has a mirror surface or a surface roughness within a range of 0.9 to 9.0 μm and an average crest interval of 10 to 150 μm And the temperature of the surface of the cavity is changed from the mold closing temperature (T 1 ) ° C. at the time of completion of the mold closing and the peak temperature (T 1 ) ° C. during the introduction of the pressurized fluid to the peak temperature ( A mold heating step for secondary temperature rise to T 2 ) ° C., and the peak temperature (T 2 ) ° C. is equal to or higher than the heat distortion temperature (T 0 ) ° C. + 30 ° C. of the amorphous thermoplastic resin. In addition, in the temperature range where blow molding can exceed the thermal deformation temperature (T 0 ) ° C., a temperature increase width for secondary temperature increase from the mold closing temperature (T 1 ) ° C. to the peak temperature (T 2 ) ° C. The temperature is set to 5 ° C. or higher.
[0009]
Further, the surface of the cavity is a mirror surface or a rough surface having a surface roughness within a range of 0.9 to 9.0 μm and an average crest interval within a range of 10 to 150 μm.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the above-mentioned cool start method, the cause of the long molding cycle time is that the cavity surface temperature at the time of completion of mold closing is set to a primary temperature lower than the Vicat softening temperature of the thermoplastic resin so as to straddle the Vicat softening temperature. Since the mold is heated so as to reach the peak temperature after the subsequent temperature increase, the temperature difference for increasing the temperature from the primary temperature to the peak temperature is large.
[0011]
Therefore, as a result of repeated experiments, when amorphous thermoplastic resin is blow-molded using a mold having a cavity with a molded product shape and a mirror surface, the amorphous heat with respect to the thermal deformation temperature (T 0) ° C. for the thermoplastic resin, blow moldable temperature range above the thermal deformation temperature (T 0) ° C., mold closing temperature (T 1) peak from ° C. temperature (T 2) ° C. It was found that by raising the temperature to the secondary temperature, not only the molding cycle time can be shortened, but also a hollow molded article having a glossy surface with good appearance and no air mark appearing can be blow molded.
[0012]
Amorphous thermoplastic resin is blow-molded using a mold having a rough cavity with a surface roughness within a range of 0.9 to 9.0 μm and an average crest interval of 10 to 150 μm. In this case, from the mold closing temperature (T 1 ) ° C. in a temperature range in which blow molding can be performed with the heat distortion temperature (T 0 ) ° C. of the amorphous thermoplastic resin as a reference and exceeding the heat deformation temperature (T 0 ) ° C. By raising the secondary temperature to the peak temperature (T 2 ) ° C, not only can the molding cycle time be shortened, but blow molds can be blow-molded with excellent mold transferability without air marks. It has also been found that a hollow molded article having excellent transferability can obtain excellent surface characteristics without polishing the surface when the surface is coated. The experimental results will be described in detail below.
[0013]
In the present invention, the amorphous thermoplastic resin means polyphenylene oxide, polycarbonate, amorphous polyamide, ABS resin, polysulfone, polyethersulfone, polyarylate, polyetherimide, high impact polystyrene, etc. The temperature of 2000 kg / cm 2 is 75 ° C. or higher, preferably 85 ° C. or higher.
[0014]
(Experimental example 1)
Using a blow molding machine equipped with an extruder having a screw diameter of 90 mm, a gloss panel (length: 700 mm, from a high impact polystyrene “A & M Styrene Co., Grade 4151” having a thermal deformation temperature (T 0 ) ° C. of 85 ° C. (Width: 320 mm, height: 25 mm, average thickness 2.5 mm) was blow-molded by the following molding process. And it evaluated by obtaining the test piece from the obtained panel and measuring the glossiness of the surface. The results are shown in Table 1.
[0015]
Here, the glossiness is a 60 ° specular gloss value measured by a glossiness measuring device (GROSS CHECKER IG-310, manufactured by Horiba, Ltd.) in accordance with JISK7105.
[0016]
In addition, the surface of the cavity of the used mold has a mirror surface, and a split mold that can change the temperature of the cavity surface by flowing the heat medium through the heat medium flow path provided in the mold. Used the mold.
[0017]
(Molding process)
(1) The Paris is pushed out and placed between the opened molds.
[0018]
In this step, the mold heating step is started so that the temperature of the cavity surface becomes the mold closing temperature (T 1 ) ° C. at the time of the next (2) mold closing completion.
[0019]
(2) After (1) above, the mold is closed and the parison is clamped. When the mold is closed, the cavity surface temperature is raised to the mold closing temperature (T 1 ) ° C. To do.
[0020]
(3) After the above (2), a pressurized fluid is introduced into the Paris and expanded along the cavity surface by the internal pressure. During the introduction of the pressurized fluid, the temperature of the cavity surface is changed to the mold closing temperature (T 1 ) Secondary heating from 0 ° C. to peak temperature (T 2 ) ° C.
[0021]
(4) After (3) above, after cooling to a temperature lower than the thermal deformation temperature in the mold, the mold is opened and the blow molded panel is taken out.
[0022]
[Table 1]
As is apparent from Samples 1 to 3 in Table 1, in the mold heating step, the peak temperature is 70 ° C where the mold closing temperature (T 1 ) ° C, which is the temperature of the cavity surface at the time of completion of mold closing, is below the Vicat softening point. It takes time for the secondary temperature to be raised to (T 2 ) ° C., which in turn results in a longer blow molding cycle time.
[0024]
As is clear from Samples 1 to 9 in Table 1, in order to obtain a glossy surface having a glossiness of 90 or more and good appearance, the peak temperature (T 2 ) ° C. must be 115 ° C. or more in the mold heating step. It becomes a necessary condition. That is, it is a necessary condition that the peak temperature (T 2 ) ° C. is equal to or higher than the heat distortion temperature (T 0 ) ° C. + 30 ° C. of high impact polystyrene which is an amorphous thermoplastic resin.
[0025]
As is clear from Samples 7 to 12 in Table 1, in the mold heating process, even when the peak temperature (T 2 ) ° C. is 115 ° C. or higher, the glossiness is 90 or higher when the secondary temperature rise is not performed. A glossy surface with good appearance cannot be obtained.
[0026]
In addition, even if the peak temperature (T 2 ) ° C. is 115 ° C. or higher, a temperature difference of 5 ° C. or higher is necessary with respect to the mold closing temperature (T 1 ) ° C. In other words, in the mold heating step, a secondary temperature increase with a temperature increase range of 5 ° C. or more from the mold closing temperature (T 1 ) ° C. is a necessary condition.
[0027]
(Experimental example 2)
The same as Example 1 except that ABS resin “Technopolymer Co., Ltd., grade name YM244” having a heat distortion temperature (T 0 ) ° C. of 95 ° C. was used as the molding material. The results are shown in Table 2.
[0028]
[Table 2]
As is clear from Samples 21 to 23 in Table 2, in the mold heating step, the temperature of the cavity surface at the time of mold closing completion, that is, the mold closing temperature (T 1 ) ° C. is 80 ° C. below the Vicat softening temperature. It takes time for the secondary temperature to be raised to (T 2 ) ° C., which in turn results in a longer blow molding cycle time.
[0030]
As is clear from Samples 21 to 32 in Table 2, in order to obtain a glossy surface having a glossiness of 90 or more and good appearance in the mold heating step, the peak temperature (T 2 ) ° C. should be 125 ° C. or more. It becomes a necessary condition. That is, it is a necessary condition that the peak temperature (T 2 ) ° C. is equal to or higher than the heat distortion temperature (T 0 ) ° C. + 30 ° C. of the ABS resin which is an amorphous thermoplastic resin.
[0031]
As is clear from Samples 28 to 32 in Table 2, even when the peak temperature (T 2 ) ° C. is 125 ° C. or higher, when the secondary temperature rise is not performed, a mirror surface having a glossiness of 90 or higher and a good appearance is obtained. I can't get it.
[0032]
In addition, even if the peak temperature (T 2 ) ° C. is 125 ° C. or higher, a temperature difference of 5 ° C. is necessary with respect to the mold closing temperature (T 1 ) ° C. That is, in the mold heating step, a secondary temperature rise from the mold closing temperature (T 1 ) ° C. to 5 ° C. or more is a necessary condition.
[0033]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0034]
The time required for the secondary temperature rise from the mold closing temperature (T 1 ) ° C. to the peak temperature (T 2 ) ° C. is short in the cavity surface. Improves. In addition, it is possible to produce a molded product having a glossy appearance with no air mark and a good gloss appearance.
Claims (1)
前記キャビティの表面が鏡面または表面粗さが０．９〜９．０μｍの範囲以内でかつ平均山間隔が１０〜１５０μｍの範囲以内である粗面であり、
前記キャビティの表面の温度を、前記型閉じ完了時点の型閉じ温度（Ｔ1）℃および前記加圧流体の導入中に前記型閉じ温度（Ｔ1）℃からピーク温度（Ｔ2）℃へ二次昇温させる金型加熱工程を備えており、
しかも、前記ピーク温度（Ｔ2）℃を前記非晶性熱可塑性樹脂の熱変形温度（Ｔ0）℃＋３０℃以上とするとともに、該熱変形温度（Ｔ0）℃を超えるブロー成形可能な温度領域で、前記型閉じ温度（Ｔ1）℃から前記ピーク温度（Ｔ2）℃へ二次昇温させる昇温幅を５℃以上にすることを特徴とする非晶性熱可塑性樹脂のブロー成形方法。Using a split mold having a cavity shaped the shape of the molded product, disposing a parison made of an amorphous thermoplastic resin between the molds opened, then closing the mold, and then inside the parison In the blow molding method of the amorphous thermoplastic resin, after being expanded into a shape along the cavity by the internal pressure by the introduced pressurized fluid, the mold is opened after being cooled in the mold,
The surface of the cavity is a mirror surface or a rough surface having a surface roughness within a range of 0.9 to 9.0 μm and an average crest interval of 10 to 150 μm,
The temperature of the cavity surface is changed from the mold closing temperature (T 1 ) ° C. at the time of completion of mold closing to the peak temperature (T 2 ) ° C. from the mold closing temperature (T 1 ) ° C. during the introduction of the pressurized fluid. It has a mold heating process to raise the temperature next,
Moreover, the temperature at which the peak temperature (T 2 ) ° C. is not less than the heat deformation temperature (T 0 ) ° C. + 30 ° C. of the amorphous thermoplastic resin and the temperature at which blow molding exceeds the heat deformation temperature (T 0 ) ° C. Blow molding of an amorphous thermoplastic resin characterized in that the temperature rise range for secondary temperature rise from the mold closing temperature (T 1 ) ° C. to the peak temperature (T 2 ) ° C. is 5 ° C. or more in the region. Method.
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| JPH071459A (en) * | 1993-05-07 | 1995-01-06 | General Electric Co <Ge> | Improved method of thermoplastic resin molding |
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| JPH071459A (en) * | 1993-05-07 | 1995-01-06 | General Electric Co <Ge> | Improved method of thermoplastic resin molding |
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