JPH04276417A - Stopping method for molding machine - Google Patents
Stopping method for molding machineInfo
- Publication number
- JPH04276417A JPH04276417A JP3062500A JP6250091A JPH04276417A JP H04276417 A JPH04276417 A JP H04276417A JP 3062500 A JP3062500 A JP 3062500A JP 6250091 A JP6250091 A JP 6250091A JP H04276417 A JPH04276417 A JP H04276417A
- Authority
- JP
- Japan
- Prior art keywords
- molding
- polycarbonate resin
- temperature
- cylinder
- molding machine
- 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
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229920005668 polycarbonate resin Polymers 0.000 claims abstract description 41
- 239000004431 polycarbonate resin Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 125000003118 aryl group Chemical group 0.000 claims description 6
- 239000002245 particle Substances 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 18
- 238000010926 purge Methods 0.000 description 13
- 239000008188 pellet Substances 0.000 description 6
- 238000002845 discoloration Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
Classifications
-
- B29C47/92—
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、芳香族ポリカーボネー
ト樹脂を溶融成形中に長時間停止する方法に関する。更
に詳しくは、停止中のシリンダー温度を特定の温度に保
持することにより、成形再開後短時間で良品となる定常
状態にできる停止方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suspending aromatic polycarbonate resin for a long period of time during melt molding. More specifically, it relates to a stopping method that maintains the temperature of the cylinder at a specific temperature during stopping to bring it into a steady state in which a good product can be produced in a short time after restarting molding.
【０００２】0002
【従来の技術】芳香族ポリカーボネート樹脂の成形は、
通常２５０〜３４０℃と高温で行われているため分解に
よるヤケ、炭化物（黒ごみ）が発生し易い。かかる高温
で成形中に、装置の故障或いは工程トラブル等により中
断せざるを得ない場合がある。この中断が５時間以上に
及ぶ長時間の場合、樹脂の分解を防ぐ方法として一般的
には、シリンダー内のポリカーボネート樹脂をポリエチ
レン樹脂等でパージした後シリンダー温度の電源を切っ
て放置する方法、又はシリンダー内のポリカーボネート
樹脂を吐出しなくなるまで排出した後電源を切って放置
する方法が行われている。かかる方法で停止後成形を再
開する場合、何れの方法においても定常状態になるまで
に長時間を要し、材料や時間のロスが大きく、この改善
が要望されている。[Prior art] Molding of aromatic polycarbonate resin is
Since the process is usually carried out at a high temperature of 250 to 340°C, discoloration and carbide (black garbage) are likely to occur due to decomposition. During molding at such high temperatures, it may be necessary to interrupt the molding process due to equipment failure or process trouble. If this interruption is for a long time, such as 5 hours or more, the general method to prevent resin decomposition is to purge the polycarbonate resin in the cylinder with polyethylene resin, etc., then turn off the power to the cylinder temperature and leave it as it is, or The method used is to drain the polycarbonate resin in the cylinder until it no longer discharges, then turn off the power and leave it as it is. When restarting molding after stopping using any of these methods, it takes a long time to reach a steady state, resulting in a large loss of material and time, and there is a desire to improve this.
【０００３】0003
【発明が解決しようとする課題】本発明は、ポリカーボ
ネート樹脂の溶融成形を中断した後成形を再開する際に
、ヤケや黒ごみの発生を抑制し、短時間で良品が得られ
る定常状態に達することのできる方法を提供することを
目的とする。[Problems to be Solved by the Invention] The present invention suppresses the generation of discoloration and black dust when restarting melt molding of polycarbonate resin after discontinuing it, and reaches a steady state in which good products can be obtained in a short time. The purpose is to provide a method that can be used.
【０００４】本発明者は、成形を中断した後成形を再開
する間、シリンダー内に溶融状態で滞留しているポリカ
ーボネート樹脂の挙動について鋭意検討した結果、成形
中断中の成形機のシリンダー温度を特定の温度に保持す
ることにより、再開後極めて短時間で定常状態に達し得
ることを究明し、本発明を完成した。[0004] As a result of intensive study on the behavior of the polycarbonate resin that remains in a molten state in the cylinder during restarting of molding after interruption of molding, the inventor determined the temperature of the cylinder of the molding machine during interruption of molding. It was discovered that by maintaining the temperature at , it is possible to reach a steady state in a very short time after restarting, and the present invention was completed.
【０００５】[0005]
【課題を解決するための手段】本発明は、芳香族ポリカ
ーボネート樹脂を溶融成形中に成形機を停止し、しかる
後成形を再開する場合、停止中の成形機のシリンダー温
度をその樹脂の成形温度よりも１００℃乃至１６０℃低
い温度に保持することを特徴とする停止方法である。[Means for Solving the Problems] In the present invention, when a molding machine is stopped during melt molding of an aromatic polycarbonate resin and then molding is restarted, the cylinder temperature of the stopped molding machine is set to the molding temperature of the resin. This stopping method is characterized by maintaining the temperature at a temperature 100°C to 160°C lower than the temperature.
【０００６】本発明で言う溶融成形機とは、射出成形機
や押出成形機等の如く樹脂を溶融させて成形する装置を
言う。以下射出成形機を例にして本発明を説明する。３
オンスのインナースクリュー式射出成形機にて、粘度平
均分子量２２，５００のポリカーボネート樹脂粉体をシ
リンダー温度３００℃で見本板（５０ｍｍ×８０ｍｍ×
５ｍｍ）を成形中成形を中断し、１６時間停止した後成
形を再開する場合、
（１）シリンダー内にポリカーボネート樹脂を残し、シ
リンダー温度を１４０〜２００℃で停止し、１６時間後
成形温度を３００℃に昇温して成形を再開したところ、
１５分のパージで黒ごみが止まり、その後黒ごみの発生
はなく非常に安定した信頼性の高い停止方法である。こ
のようにシリンダー内にポリカーボネート樹脂を残し、
且つ１４０〜２００℃に保持した場合、金属と樹脂の密
着が弱まり、壁面の金属剥離が少なく、またシリンダー
内の空気が少ないためポリカーボネート樹脂の分解も少
なく黒ごみの発生が少なく、短時間で安定するものと思
われる。[0006] The melt molding machine used in the present invention refers to an apparatus that melts and molds resin, such as an injection molding machine or an extrusion molding machine. The present invention will be explained below using an injection molding machine as an example. 3
Using an ounce inner screw injection molding machine, a sample plate (50 mm x 80 mm x
5mm) during molding, and when restarting molding after stopping for 16 hours, (1) Leave the polycarbonate resin in the cylinder, stop the cylinder temperature at 140 to 200 °C, and after 16 hours, reduce the molding temperature to 300 °C. When the temperature was raised to ℃ and molding was restarted,
The black dust stops after 15 minutes of purging, and there is no black dust after that, making this a very stable and reliable stopping method. In this way, leave the polycarbonate resin inside the cylinder,
In addition, when kept at 140-200℃, the adhesion between metal and resin weakens, there is less metal peeling from the wall, and because there is less air in the cylinder, there is less decomposition of the polycarbonate resin, less black dust is generated, and it becomes stable in a short time. It seems that it will.
【０００７】（２）シリンダー内のポリカーボネート樹
脂を吐出しなくなるまで排出し、シリンダー温度の電源
を切り放置し、１６時間後成形温度を３００℃に昇温し
て成形を再開したところ、１．５時間パージしても黒ご
みが発生し、良品となる定常状態に達するまで長時間を
要したうえ、良質と思われる状態になっても突発的に黒
ごみが発生し、極めて不安定で信頼性のない停止方法で
あった。このようにシリンダーを空にし、温度を下げた
状態で停止すると、残ったポリカーボネート樹脂はシリ
ンダー内で固化し、且つシリンダー内には空気が充満し
た状態になっている。この状態から成形温度の３００℃
近くに昇温すると、シリンダー壁面に密着したポリカー
ボネート樹脂との温度差及び金属とポリカーボネート樹
脂の膨脹係数の違いにより壁面金属が剥離したり、空気
によるポリカーボネート樹脂の分解により炭化物となっ
て黒ごみが多量発生するものと思われる。(2) The polycarbonate resin in the cylinder was discharged until it was no longer discharged, the power to the cylinder temperature was turned off, and the cylinder temperature was left as it was. After 16 hours, the molding temperature was raised to 300°C and molding was restarted, and the result was 1.5 Even after purging for a long time, black dust is generated, and it takes a long time to reach a steady state in which the product becomes good, and even when it appears to be of good quality, black dust suddenly appears, making it extremely unstable and unreliable. There was no stopping method. When the cylinder is emptied in this way and stopped with the temperature lowered, the remaining polycarbonate resin solidifies inside the cylinder, and the cylinder is filled with air. From this state, the molding temperature is 300℃.
If the temperature rises nearby, the wall metal may peel off due to the temperature difference with the polycarbonate resin that is in close contact with the cylinder wall and the difference in the expansion coefficient between the metal and the polycarbonate resin, and the polycarbonate resin decomposes in the air and becomes carbonized, resulting in a large amount of black garbage. This is expected to occur.
【０００８】（３）シリスダーにポリカーボネート樹脂
を残しても、シリンダー温度を１３０℃以下にすると、
シリンダー壁面とポリカーボネート樹脂の密着力が大き
く、膨脹係数の差により金属が剥離し易くなり、黒ごみ
の発生を増加させるようになる。また、逆にシリンダー
温度を２００℃以上にしたのでは高温のため、ポリカー
ボネート樹脂が分解されヤケ、黒ごみの発生を増加させ
るようになる。(3) Even if the polycarbonate resin remains in the cylinder, if the cylinder temperature is lower than 130°C,
The adhesion between the cylinder wall and the polycarbonate resin is strong, and the difference in expansion coefficients makes it easy for the metal to peel off, increasing the generation of black dust. On the other hand, if the cylinder temperature is set to 200° C. or higher, the polycarbonate resin will be decomposed due to the high temperature, increasing the occurrence of burns and black dust.
【０００９】本発明でいうポリカーボネート樹脂とは、
芳香族二価フェノール類及びそれらの核置換されたフェ
ノール類からなるホモ又はコポリポリカーボネートであ
り、分岐ポリカーボネートであってもよい。また、これ
らと脂環族二価アルコールとのコポリポリカーボネート
であっても、又はこれらと芳香族二価の酸とからなるポ
リエステルカーボネートであっても、これらポリカーボ
ネート樹脂と他の樹脂とのブレンド物又はアロイであっ
てもよい。[0009] The polycarbonate resin referred to in the present invention is
It is a homo- or copolycarbonate consisting of aromatic dihydric phenols and their nuclear-substituted phenols, and may be a branched polycarbonate. In addition, even if it is a copolypolycarbonate made of these and an alicyclic dihydric alcohol, or a polyester carbonate made of these and an aromatic dihydric acid, a blend of these polycarbonate resins and other resins or It may be an alloy.
【００１０】更に、上記ポリカーボネート樹脂には必要
に応じて、例えば紫外線吸収剤、無機又は有機添加剤、
安定剤、着色剤、補強材（ガラス繊維、炭素繊維、ウイ
スカ等）等を添加しても、本発明によると再開時極めて
短時間で定常状態になる。但し、ハロゲン系化合物及び
ハロゲン系難燃樹脂等分解して装置を腐食する作用のあ
るもの、又分解し易い樹脂を混合する場合は、直ちにポ
リカーボネート樹脂でパージした後本発明の方法による
とよい。[0010] Furthermore, if necessary, the polycarbonate resin may contain, for example, an ultraviolet absorber, an inorganic or organic additive,
Even if stabilizers, colorants, reinforcing materials (glass fibers, carbon fibers, whiskers, etc.) are added, according to the present invention, a steady state is reached in a very short time upon restart. However, when mixing halogen compounds, halogen flame retardant resins, etc. that decompose and corrode the equipment, or resins that are easily decomposed, it is best to immediately purge with polycarbonate resin and then use the method of the present invention.
【００１１】[0011]
【実施例】次に実施例をあげて本発明を更に説明する。[Examples] Next, the present invention will be further explained with reference to Examples.
【００１２】0012
【実施例１】粘度平均分子量２２，５００のポリカーボ
ネート樹脂粉体を射出成形機［日本製鋼所製３オンス（
インナースクリュー式）］により射出圧１３３０ｋｇ／
ｃｍ２ 、保圧４５０ｋｇ／ｃｍ２ 、背圧１００ｋｇ
／ｃｍ２ 、射出時間１８秒、冷却時間２０秒、成形温
度３００℃、金型温度８０℃で見本板［（５ｍｍ×８０
ｍｍ×５ｍｍ）１個取り］を成形し、成形を中断し、シ
リンダー温度を２００℃に設定変更してシリンダー内に
ポリカーボネート樹脂が存在する状態で１６時間放置し
た後シリンダー温度を３００℃に設定し、３０分後３０
０℃に到達した。ここでポリカーボネート樹脂約１．５
ｋｇ（約１５分）でパージしたところで黒ごみ、ヤケの
発生が止まり、続いてポリカーボネート樹脂１２ｋｇ（
３時間）成形したが、黒ごみやヤケの発生は全くなく安
定して良品が取れた。[Example 1] Polycarbonate resin powder with a viscosity average molecular weight of 22,500 was injected into an injection molding machine [3 oz.
Injection pressure 1330kg/
cm2, holding pressure 450kg/cm2, back pressure 100kg
/cm2, injection time 18 seconds, cooling time 20 seconds, molding temperature 300℃, mold temperature 80℃.
mm x 5 mm) was molded, the molding was interrupted, the cylinder temperature was changed to 200°C, and after leaving it for 16 hours with the polycarbonate resin present in the cylinder, the cylinder temperature was set to 300°C. , 30 minutes later 30
The temperature reached 0°C. Here polycarbonate resin is about 1.5
After purging with 12 kg (approx. 15 minutes) of polycarbonate resin, black dust and discoloration stopped.
After molding for 3 hours), there was no black dust or discoloration, and good products were obtained stably.
【００１３】[0013]
【比較例１】停止時のシリンダー温度を１３０℃にする
以外は実施例１と同様に成形を再開したところ、３００
℃に到達するのに５０分を要し、パージにポリカーボネ
ート樹脂を４．５ｋｇ（約４５分）を要したところでほ
ぼ黒ゴミの発生は止った。そこで良品とすべく成形を続
けたが時々黒ごみが発生し、約４ｋｇ（約１時間）は良
品にならなかった。その後良品８ｋｇ（２時間）が得ら
れた。[Comparative Example 1] Molding was restarted in the same manner as in Example 1 except that the cylinder temperature at the time of stopping was 130°C.
It took 50 minutes to reach the temperature, and the generation of black dust almost stopped when it took 4.5 kg of polycarbonate resin (about 45 minutes) to purge. Therefore, we continued molding to make a good product, but black dust occasionally appeared, and about 4 kg (about 1 hour) did not become a good product. After that, 8 kg of good products (2 hours) were obtained.
【００１４】[0014]
【比較例２】停止時のシリンダー温度を２４０℃にする
以外は実施例１と同様に成形を再開したところ、３００
℃に到達するのに２０分で済み、パージにポリカーボネ
ート樹脂を４．５ｋｇ（約４５分）を要したところでほ
ぼ黒ゴミの発生は止った。そこで良品とすべく成形を続
けたが時々黒ごみが発生し、約４ｋｇ（約１時間）は良
品にならなかった。その後良品８ｋｇ（２時間）が得ら
れた。[Comparative Example 2] Molding was restarted in the same manner as in Example 1 except that the cylinder temperature at the time of stopping was 240°C.
It took only 20 minutes to reach the temperature of ℃, and the generation of black dust almost stopped when it took 4.5 kg of polycarbonate resin (about 45 minutes) to purge. Therefore, we continued molding to make a good product, but black dust occasionally appeared, and about 4 kg (about 1 hour) did not become a good product. After that, 8 kg of good products (2 hours) were obtained.
【００１５】[0015]
【比較例３】成形を中断した後、シリンダー中のポリカ
ーボネート樹脂を吐出しなくなるまで排出し、シリンダ
ー温度の電源を切り１６時間放置した後、シリンダー温
度の設定を３００℃にし、約１．５時間後に３００℃に
到達したのでパージを開始し、ポリカーボネート樹脂６
．５ｋｇパージしたところで黒ゴミの発生はほぼ止った
。続いて良品としての成形をしたが、ポリカーボネート
樹脂１２ｋｇ（約３時間）成形するも突発的に黒ゴミが
発生し、安定した良品は取れなかった。[Comparative Example 3] After interrupting molding, drain the polycarbonate resin in the cylinder until it no longer discharges, turn off the power to the cylinder temperature, leave it for 16 hours, then set the cylinder temperature to 300°C for about 1.5 hours. Later, when the temperature reached 300℃, purge was started and polycarbonate resin 6
．． After purging 5 kg, the generation of black garbage almost stopped. Subsequently, a good product was molded, but even after molding 12 kg of polycarbonate resin (for about 3 hours), black dust suddenly appeared and a stable good product could not be obtained.
【００１６】[0016]
【実施例２】粘度平均分子量２２，５００のポリカーボ
ネート樹脂粉体をベント付き単軸押出機［石中鉄工所製
スクリュー直径７０ｍｍ］により、スレッド７本取りダ
イス、スクリュー回転数４５ ｒｐｍ、シリンダー温度
２９０℃、ベント３０Ｔｏｒｒで溶融押出してペレット
を作成し、ホッパ下のスクリューにポリカーボネート樹
脂粉体がなくなった時点でスクリューを止め、シリンダ
ー内にポリカーボネート樹脂を残した状態でシリンダー
温度を１８０℃に設定した。１６時間停止した後シリン
ダー温度を２９０℃に設定し、６０分後に２９０℃に到
達したのでパージを開始し、ポリカーボネート樹脂約８
ｋｇ（１０分）パージしたところで黒ごみの発生は止ま
った。続いて良品ペレットとして１００ｋｇ（約２時間
）作成したが、黒ごみの発生はなく、安定して良品ペレ
ットが得られた。[Example 2] Polycarbonate resin powder with a viscosity average molecular weight of 22,500 was processed using a vented single-screw extruder [manufactured by Ishinaka Iron Works, screw diameter 70 mm] using a die with 7 threads, screw rotation speed 45 rpm, and cylinder temperature 290. Pellets were created by melt extrusion at 30 Torr in a vent at 30°C, and when there was no more polycarbonate resin powder in the screw under the hopper, the screw was stopped and the cylinder temperature was set at 180°C with the polycarbonate resin remaining in the cylinder. After stopping for 16 hours, the cylinder temperature was set at 290°C, and after 60 minutes it reached 290°C, so purge was started and the polycarbonate resin
After purging 1 kg (10 minutes), the generation of black garbage stopped. Subsequently, 100 kg (about 2 hours) of good quality pellets were produced, but no black dust was generated and good quality pellets were stably obtained.
【００１７】[0017]
【比較例４】ホッパ下のスクリューにポリカーボネート
樹脂粉体がなくなった時点でシリンダー中の樹脂が吐出
しなくなるまで排出し、シリンダー温度の電源を切り、
１６時間放置した後シリンダー温度を２９０℃に設定し
、９０分後に２９０℃に到達したのでしてパージを開始
し、ポリカーボネート樹脂１１ｋｇ（約１４分）パージ
したところで黒ごみの発生は止まり、続いて１００ｋｇ
（約２時間）ペレットを作成したが、黒ごみが突発的に
発生し、不安定で良品ペレットは得られなかった。[Comparative Example 4] When there is no more polycarbonate resin powder in the screw under the hopper, drain the cylinder until the resin is no longer discharged, turn off the cylinder temperature power,
After leaving the cylinder for 16 hours, the cylinder temperature was set to 290℃, and after 90 minutes, the temperature reached 290℃, so we started purging, and after purging 11kg of polycarbonate resin (about 14 minutes), the generation of black garbage stopped, and then 100kg
Although pellets were made (for about 2 hours), black dust suddenly appeared and the pellets were unstable and good quality pellets could not be obtained.
【００１８】以上の結果を表１に示した。The above results are shown in Table 1.
【００１９】[0019]
【表１】[Table 1]
【００２０】[0020]
【発明の効果】本発明によれば、ポリカーボネート樹脂
の溶融成形を中断した後成形を再開する際に、ヤケや黒
ごみの発生を抑制し、短時間で良品が得られる定常状態
に達することができ、材料や時間のロスを少なくし、生
産性を向上することが可能になり、その工業的効果は格
別なものである。[Effects of the Invention] According to the present invention, when restarting melt molding of polycarbonate resin after interrupting it, it is possible to suppress the generation of discoloration and black dust and reach a steady state in which a good product can be obtained in a short time. This makes it possible to reduce the loss of materials and time and improve productivity, and the industrial effect is exceptional.
Claims (1)
形中に成形機を停止し、しかる後成形を再開する場合、
停止中の成形機のシリンダー温度をその樹脂の成形温度
よりも１００℃乃至１６０℃低い温度に保持することを
特徴とする停止方法。Claim 1: When stopping a molding machine during melt molding of an aromatic polycarbonate resin and then restarting molding,
A stopping method characterized by maintaining the cylinder temperature of a stopped molding machine at a temperature 100°C to 160°C lower than the molding temperature of the resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3062500A JPH04276417A (en) | 1991-03-05 | 1991-03-05 | Stopping method for molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3062500A JPH04276417A (en) | 1991-03-05 | 1991-03-05 | Stopping method for molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04276417A true JPH04276417A (en) | 1992-10-01 |
Family
ID=13201952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3062500A Pending JPH04276417A (en) | 1991-03-05 | 1991-03-05 | Stopping method for molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04276417A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002052596A (en) * | 2000-08-07 | 2002-02-19 | Sumitomo Chem Co Ltd | Method for preventing mixture of colored foreign matter with molding by extrusion molding |
| WO2013061991A1 (en) * | 2011-10-24 | 2013-05-02 | 東洋機械金属株式会社 | Method for controlling temperature of thermoplastic resin in injection molding machine |
-
1991
- 1991-03-05 JP JP3062500A patent/JPH04276417A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002052596A (en) * | 2000-08-07 | 2002-02-19 | Sumitomo Chem Co Ltd | Method for preventing mixture of colored foreign matter with molding by extrusion molding |
| WO2013061991A1 (en) * | 2011-10-24 | 2013-05-02 | 東洋機械金属株式会社 | Method for controlling temperature of thermoplastic resin in injection molding machine |
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