201012623 九、發明說明： 【發明所屬之技術領域】 本發明係與發泡塑料件之成形有關，特別是關於一種改善發泡塑 料件外觀且加速成形之微發泡塑料件射出成形系統及方法。 【先前技術】201012623 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to the formation of a foamed plastic part, and more particularly to a microfoamed plastic part injection molding system and method for improving the appearance of an expanded plastic part and accelerating the forming. [Prior Art]
請參閱「第1圖」所示為習知技術之微發泡塑料件射出成形系統 之剖面示意圖。製作發泡成形之塑料件，係於注塑液注人模具之i模 穴之過程中，以發泡氣體源2將高壓空氣注入注塑機3中，使高壓空 氣被混入_液形成微小氣泡。於雜液完細化之後，微小氣泡便 會於塑料射形成微小祕。微小氣孔可減輕㈣狀重量。同時， 氣孔的存在賴整騎祕數，注驗冷卻為鱗件_財，收縮 現象變得比較不明顯。因此’發泡塑料件尺寸縮水或是因材料冷卻收 縮而造成之翹曲也會變得比較不明顯。 具有微小氣社注驗進人模穴之後，獅歡表面之注塑液之 咖度迅速降低’使得位於敎表面之氣泡無法繼續鶴。因此這些位 於模穴表面之微顿泡於_件表面形絲痕，這些氣雜著注塑液 流動方向成放錄分佈。氣痕致使魏麵件的物不平整，因此發 泡塑料件錢在進行上漆等表面加工，酬發泡_件就只能作為内 構件，無法作為外樂俥。 一 此外’破注人_液内部之高魏體，會由注·之自由表面脫 離，而進讀仅巾。隨補填充_穴，料氣體會 破注塑顏物咐卿，喊峨W蝴之間的細 201012623 缝離開模穴’此—現象稱細氣彳。目氣4造姐錄無法確實填充模 八同時’注塑液接觸困氣4的部分，由於無法確實接觸模穴表面進 行降溫，因此會出現溫度過高而燒焦的現象。是以，發泡塑料件除了 關氣4造成表面結構不完整之外，在這些結構缺陷之處也會有燒焦 舰象。為了齡困氣躲，必須以注賴注人超過就量之注塑液， 迫使注塑料流入困氣4巾以消除困氣4。但是過量之注餘致使模穴内 邰缺乏足夠空間供微小氣泡練（注塑液相對於微小氣泡為不可壓縮 ❸ 流）’影響發^效果而無法達成減輕重量之功效。 因此’如何改善發泡麵之成騎程，_免困氣造成發泡塑料 件的缺陷或疋;主入過量注塑液造成之問題，成為重要之技術課題。 【發明内容】 鑑於上述問題’本發明目的在概出-種微發雜料件射出成形 系統及其方法’係可避細氣躲發生、改#發_料件表面狀態、 及注入過量注塑液之問題發生。 G 為了達成上述目的，本發明提出-種微發泡塑料件射出成形系 統’包含模具、控溫裝置、注塑機、發泡氣體源'及模穴壓力控制装 置、。模具具有一公模及一母模，互相合模形成一模穴，用以供注塑液 被注入其中。控溫裝置用以加熱模具至工作溫度或冷卻模具至一開 模溫度。注賴用以注入注塑液於模穴中，且發泡氣體源注入高職 體至注塑射，使高壓氣體難麵巾形成微小氣泡。歡壓力控制 裝置用以於注賴注人注·於該模穴之前，翻對模穴產生一第一 負麼氣現象及發泡塑料件表面之氣痕，改善發泡塑料件之 201012623 外觀。且模穴壓力控制裝置於注 液叙人模穴過程中停止第一負 壓並對及模穴產生一正壓脈衝， 错u抑制注塑液流動，避免注入過 篁注塑液之問題發生。 本發明更提出-種微發泡塑料件射出成形方法，係於模具進行合 模之後’持績對模具之模穴施加第—負遷，使模穴之壓力小於外壓力。 接者持續注入注塑液至模穴中，並注入高遷空氣於注塑液中。高壓氣 體於注塑液中形成微小氣泡，而第氣現象及發泡塑料件 • 纟面之氣痕，改善發㈣料件之外觀。接著，停止第-負Μ，並對模 穴施加-正壓脈衝，藉以抑制注流動，避免注人過量注塑液之問 題發生。最後使使模穴中之氣體隨著注·之注人而排出，並於注塑 液填滿模穴讀停姐人注舰，縣倾[機具冷卻完成之後， 即可進行開模取出注雛@化形成之發泡塑料件。 本發明之功效在於’本發韻少_氣錢痕造成於發泡塑料件 外觀不平整之現象’使發泡塑料件具備光滑的外觀，而可用以作為外 觀件。_ ’本發日脚佩泡過度成長，並避免注塑機注人過量注塑 液之問題發生〇 【實施方式】 請參閱「第2圖」、「第3圖」、及「第4圖」所示，為本發明實施 例所揭露之微發泡歸件射出_，包含—模具ω、—合模裝置 2〇、-控溫裝置30、-模穴壓力控制裝置4〇、一注塑機5〇、及一發泡 氣體源60。 包令-- 參閱「第2圖」、「第3圖」、及「第4圖」所示，模具ι〇 201012623 公模11及-母模12，其中公模u及母模分別具備互相對應之内凹 或Μ結構’用以於公模Π及母模12互相結合進行合模作業之後，於 模具10内部形成-模A 13。模具1〇更具有複數個通道14，埋設於公 模η或母模12之中’各通道14可為頭尾互相串連或是平行並列，用 以供高溫流體或冷卻流體通過’以加熱或冷卻模具10。母模U具有複 數個氣道’連通模穴13與外界。當公模„及母模12互相合模時，模 穴13可進人氣密狀態’氣道用以供氣體通過以進人或賴模穴。複數 個氣道中包含至少-進氣道131及-排氣道132，進氣道131用以供高 馨 壓氣體被注入模穴13中’對模穴13產生正麗（模穴13中壓力大於外 界壓力）。排氣道132用以供抽氣，對模穴13產生負壓（模穴13中壓 力小於外界壓力）。 此外’公模11具有-組道m，連通公模u之外麻及模穴以 注塑機50連接於洗注道⑴，用以將注塑液（高溫祕之液態塑勝） 透過洗注道111注入模穴13中。發泡氣體源6〇連接於注塑機5〇，用 以於注塑機50推送注塑液進入模穴13時，以喷嘴注入高壓氣體至注 ® 麵中，使高壓氣體於注塑液中形成微小氣泡。微小氣泡隨著注塑液 的流動而分佈於注塑液中1於高溫狀態下膨脹以增加其直徑。注塑 液冷卻固化為發泡塑料件後，微小氣泡所在位置即形成多孔隙結構。 參閱「第3圖」及「第4圖」所示，合模裝置2〇用以線性致動模 具1〇之部分或是全部元件，對模纟1〇進行開模或是合模。合模裝置 2〇可為油難置、連桿致動裝置、或導螺桿總成，於本實施例中，合 模裝置20為油壓裝置，包含—支架21及複數個油· ^，其中^ 21及油Μ缸22設置於-基座24，且油獻22之驅鱗23係穿過支 201012623 -而連接輪具Ι〇β其中，模具1〇之母模可移動地設置，而公模 系口疋叹置於基座24，驅動桿23連接於母模u，用以線性致動母 模12移動轉合於公模n，使模具m進行合模；或是線性致動母模 - 】2移動而脫離公模，使模具10進行開模。 .參閱「第2圖」、厂第3圖」、及厂第4圖」所示，控溫裝置％包 含加熱主機31、冷卻主機32、及排液主機33，加熱主機31用以加熱 模具10至-工作溫度，以維持注塑原料之流動性，並提升發泡效率， • 使發泡塑料件之孔隙大小及孔隙率到達預定值。冷卻主機32用以冷卻 杈具10，加速模具10之溫度冷卻至一開模溫度，縮短注塑完成至開模 之間的等待時間。 於本實施例中’加熱域3〗為—高溫流艘源，用以提供高溫流體， 例如-鍋爐’加熱純水產生高壓高溫蒸汽。且加熱主機31通過一加熱 P奶312連接於模具1〇之通道14，提供高溫流體通過各通道14以加 熱模具10至功溫度。冷卻域32肋提供冷卻频，例如連接水 槽之冷凝器’提供低溫之冷卻水。冷卻主機32通過一冷卻閥門奶連 ® 接於模具10之通道14，提供冷卻流體通過各通道I4，以冷卻模具10 至開模溫度。赫㈣道14之冑溫碰’清冷職體之冷卻效果。 反之，殘存於通道Μ冷卻流體’也影響高溫流體之加熱效果。排液主 機33通過-排賴門332連接於通道，用以提供高壓且乾燥之氣體通 過各通道14，以排出通道14内部殘存之冷卻液體或高溫流體。 參閱第2圖」及「第3圖」所示，模穴壓力控制裝置4〇透過進 氣道131及排氣道132連接於模穴13。模穴壓力控制裝置4〇經由進氣 道⑶供應壓縮氣體至模穴13中，賴穴13 _產生正壓；或是經 201012623 由排氣道132抽取模穴13内部之氣體，對模穴使模穴13内部產生負 壓。模穴壓力控制裝置40包含高壓氣體源41及抽氣主機42，高壓氣 體源4i為高壓氣瓶或高觀浦，用以產生高壓氣體，抽氣主機42為 真空杲浦’用以產生負壓抽取模穴13之氣體。高壓氣體源41透過正 壓氣閥412連接於進氣道131，以連接模穴13 ;且抽氣主機42透過負 壓氣閥422連接於排氣道132，以連接模穴13。其中，正壓氣間412 及負壓氣閥422係可被切換為開啟或關閉，切換高壓氣體源41及抽氣 主機42是否連接模穴13。Please refer to the sectional view of the micro-foamed plastic part injection molding system shown in the "Fig. 1". The foamed plastic part is produced in the process of injecting the injection mold into the i-cavity of the mold, and the high-pressure air is injected into the injection molding machine 3 by the foaming gas source 2, so that the high-pressure air is mixed into the liquid to form fine bubbles. After the refining of the miscellaneous liquid, the tiny bubbles will form a tiny secret in the plastic. Tiny pores can reduce the weight of the (four) shape. At the same time, the existence of the stomata depends on the number of the whole riding, and the cooling is the scale. The shrinkage phenomenon becomes less obvious. Therefore, the shrinkage of the foamed plastic part or the warpage caused by the cooling of the material will become less noticeable. After the tiny gas society was injected into the mold cavity, the calorie of the injection molding liquid on the surface of the lion's face was rapidly reduced, so that the bubbles on the surface of the enamel could not continue the crane. Therefore, these micro-spots on the surface of the cavity are immersed in the surface of the _ piece, which is mixed with the flow direction of the injection molding fluid into a distribution. The gas marks cause the Wei surface parts to be uneven, so the foam plastic parts are processed on the surface such as lacquering, and the foaming parts can only be used as internal components and cannot be used as external music. In addition, the high-wei body inside the 'breaking man' liquid will be separated from the free surface of the note, and only the towel will be read. With the filling _ hole, the material gas will break the injection of the object 咐 , ,, shouting 峨 W butterfly between the fine 201012623 sewed away from the cavity ‘this phenomenon is called fine air 彳. I can't really fill the mold at the same time. The part where the injection molding fluid contacts the trapped gas 4, because it can't really contact the surface of the cavity to cool down, it will cause the temperature to be too high and burnt. Therefore, in addition to the insufficiency of the surface structure of the foamed plastic parts, there are also scorched ships in these structural defects. In order to avoid being trapped, it is necessary to inject more than the amount of injection molding liquid, forcing the injection plastic into the trapped air towel to eliminate the trapped air. However, the excessive amount of the residue causes the cavity in the cavity to have insufficient space for the microbubble to be practiced (the injection molding liquid is incompressible turbulent flow for the microbubbles), and the effect of reducing the weight cannot be achieved. Therefore, how to improve the riding of the foaming surface, _ avoiding the defects or defects of the foamed plastic parts caused by the trapped air; the problem caused by the injection of the excess injection molding liquid becomes an important technical issue. SUMMARY OF THE INVENTION In view of the above problems, the object of the present invention is to extract a micro-powder injection molding system and method thereof, which can avoid the occurrence of fine gas escape, change the surface state of the material, and inject excess injection molding liquid. The problem occurred. In order to achieve the above object, the present invention proposes a micro-foamed plastic part injection molding system 'including a mold, a temperature control device, an injection molding machine, a foaming gas source', and a cavity pressure control device. The mold has a male mold and a female mold, and is clamped to each other to form a cavity for the injection molding liquid to be injected therein. The temperature control device is used to heat the mold to the operating temperature or to cool the mold to a mold opening temperature. The injection is used to inject the injection molding fluid into the cavity, and the foaming gas source is injected into the high-volume body to the injection molding, so that the high-pressure gas is difficult to form a small bubble. The pressure control device is used to inject a first negative gas phenomenon and a gas mark on the surface of the foamed plastic part before the injection of the mold hole, and to improve the appearance of the foamed plastic part 201012623. And the cavity pressure control device stops the first negative pressure during the injection of the liquid mold cavity and generates a positive pressure pulse to the cavity, and the wrong u suppresses the flow of the injection liquid, thereby avoiding the problem of injecting the injection molding liquid. The invention further proposes a method for injection molding of a micro-foamed plastic part, which is applied to the mold cavity of the mold after the mold is clamped, so that the pressure of the mold cavity is less than the external pressure. The receiver continuously injects the injection molding fluid into the cavity and injects high-migration air into the injection molding fluid. The high-pressure gas forms tiny bubbles in the injection molding fluid, and the gas phenomenon and the foamed plastic parts • the gas marks on the surface of the dough improve the appearance of the material. Next, the first-negative enthalpy is stopped, and a positive-pressure pulse is applied to the cavity to suppress the flow of the injection, thereby avoiding the problem of injecting excess injection molding fluid. Finally, the gas in the cavity is discharged along with the injection of the injection, and the injection molding liquid fills the cavity to stop the sister's injection, and the county is tilted [after the machine is cooled, the mold can be taken out and taken out @@ Foamed plastic parts formed. The effect of the present invention is that the phenomenon of "unevenness of the foamed plastic part caused by the lack of the rhyme of the hairpin" makes the foamed plastic part have a smooth appearance and can be used as an exterior member. _ 'The hair of the hair is overgrown and avoids the problem of excessive injection molding of the injection molding machine. [Embodiment] Please refer to "Figure 2", "Figure 3" and "Figure 4" The micro-foamed component injection method disclosed in the embodiment of the present invention includes: a mold ω, a mold clamping device 2〇, a temperature control device 30, a cavity pressure control device 4〇, an injection molding machine 5〇, And a source of foaming gas 60.包令-- See "Figure 2", "Picture 3" and "Figure 4", mold ι〇201012623 male mold 11 and - mother mold 12, in which the male model u and the female model respectively correspond to each other The concave or Μ structure ' is used to form the mold A 13 inside the mold 10 after the male mold and the female mold 12 are bonded to each other for the mold clamping operation. The mold 1 〇 further has a plurality of channels 14 embedded in the male mold η or the female mold 12 'each of the passages 14 may be end-to-end or parallel in parallel for the high temperature fluid or cooling fluid to pass 'heating or The mold 10 is cooled. The master U has a plurality of air passages 'connecting the cavity 13 to the outside. When the male mold „ and the female mold 12 are clamped to each other, the cavity 13 can enter the airtight state. The air passage is for the gas to pass through to enter or lie the cavity. The plurality of air passages include at least the air inlet 131 and the row. The air passage 132, the air inlet 131 is used for the high-pressure gas to be injected into the cavity 13 to generate positive pressure on the cavity 13 (the pressure in the cavity 13 is greater than the external pressure). The exhaust passage 132 is used for pumping. A negative pressure is generated on the cavity 13 (the pressure in the cavity 13 is less than the external pressure). In addition, the 'mold 11 has a group m, and the die and the cavity outside the male die are connected to the washing lane (1) by the injection molding machine 50, The injection molding liquid (the high temperature secret liquid plastic) is injected into the cavity 13 through the washing lane 111. The foaming gas source 6〇 is connected to the injection molding machine 5〇, and is used for pushing the injection molding liquid into the cavity 13 by the injection molding machine 50. When the nozzle is injected with high-pressure gas into the surface of the injection surface, the high-pressure gas forms tiny bubbles in the injection molding liquid. The micro-bubbles are distributed in the injection molding liquid as the injection molding liquid flows, and expand at a high temperature to increase the diameter thereof. After the liquid is cooled and solidified into a foamed plastic part, the position of the tiny bubbles forms a porous Structure Referring to "FIG. 3" and "FIG. 4", the clamping means for 2〇 linear actuator 1〇 mold portion or all of the elements of Si 1〇 mold clamping or mold opening. The clamping device 2 can be an oil-tight device, a link actuating device, or a lead screw assembly. In the embodiment, the clamping device 20 is a hydraulic device, including a bracket 21 and a plurality of oils, wherein ^ 21 and the oil cylinder 22 are disposed on the base 24, and the drive scale 23 of the oil supply 22 is passed through the support 201012623 - and the wheel Ι〇β is connected thereto, and the mold of the mold 1〇 is movably set, and the The die slap is placed on the base 24, and the driving rod 23 is connected to the female die u for linearly actuating the female die 12 to move to the male die n to mold the die m; or linearly actuating the female die - 】 2 moves away from the male mold, so that the mold 10 is opened. Referring to "Fig. 2", the third picture of the factory, and the fourth picture of the factory, the temperature control device % includes a heating main unit 31, a cooling main unit 32, and a liquid discharge main unit 33, and the heating main unit 31 is used to heat the mold 10. To - working temperature to maintain the fluidity of the injection molding material and improve the foaming efficiency, • The pore size and porosity of the foamed plastic part reach a predetermined value. The cooling main unit 32 is used to cool the cookware 10, accelerate the temperature of the mold 10 to a mold opening temperature, and shorten the waiting time between the completion of the injection molding and the mold opening. In the present embodiment, the 'heating zone 3' is a high temperature flow source for providing a high temperature fluid, for example, a boiler 'heating pure water to generate high pressure and high temperature steam. And the heating main unit 31 is connected to the passage 14 of the mold 1 through a heated P milk 312 to supply high temperature fluid through each passage 14 to heat the mold 10 to the work temperature. The cooling zone 32 ribs provide a cooling frequency, such as a condenser that connects the water tanks to provide low temperature cooling water. The cooling unit 32 is connected to the passage 14 of the mold 10 through a cooling valve, and supplies cooling fluid through each of the passages I4 to cool the mold 10 to the mold opening temperature. He (four) road 14 胄 胄 ’ ’ 'cooling effect of the cold body. Conversely, the residual cooling fluid in the channel also affects the heating effect of the high temperature fluid. The drain main engine 33 is connected to the passage through the discharge gate 332 for supplying high pressure and dry gas through the passages 14 to discharge the remaining cooling liquid or high temperature fluid inside the passage 14. Referring to Figures 2 and 3, the cavity pressure control device 4 is connected to the cavity 13 through the intake passage 131 and the exhaust passage 132. The cavity pressure control device 4 供应 supplies compressed gas to the cavity 13 via the intake port (3), and the positive pressure is generated by the lag hole 13; or the gas inside the cavity 13 is extracted by the exhaust passage 132 through the 201012623, A negative pressure is generated inside the cavity 13. The cavity pressure control device 40 comprises a high pressure gas source 41 and a pumping main unit 42. The high pressure gas source 4i is a high pressure gas cylinder or a high pressure pump for generating high pressure gas, and the suction main unit 42 is a vacuum pump for generating a negative pressure extraction mode. The gas of the hole 13. The high pressure gas source 41 is connected to the intake port 131 through the positive pressure air valve 412 to connect the cavity 13; and the suction main unit 42 is connected to the exhaust passage 132 through the negative pressure air valve 422 to connect the cavity 13. The positive pressure air chamber 412 and the negative pressure air valve 422 can be switched to be opened or closed to switch whether the high pressure gas source 41 and the air suction main unit 42 are connected to the cavity 13.
本發明實施例之運作流程如下所述。 參閱「第5圖」及「第6圖」所示，並結合「第2圖」及「第3 圖」。於開始發騎出成形作業時，或前—次發泡射出成形作業完成之 後’模具1〇係呈開模狀態，開模裝置2〇驅動母模U脫離公模U，使 模穴B表面外露，前-次射出成形㈣完成之發泡歸件亦可被取 出。於此同時’控溫裝置3G之加熱主機31開始提供高溫流體，通入 通道14之中以開始加熱模具10，如「第1圖」所示。加熱模具10之 ^法不’綱線购4，峨$ ω t峨含感應加 …、電熱棒加熱、或直火加熱。當模穴13表面之溫度到達工作溫度時， 加熱主機21停止供應高溫流體，使控溫裝置3〇停止加熱模具⑺加敛。 決定模穴表面是制達轉溫度，可以透過_鱗溫度感庫器之 監測’取得歡3表面之溫度。献’ «魏縣狀祕時間， 於加__猶朗模穴13表面之溫度⑽紅作溫度。模穴13 表面之溫度職轉溫度之後’合難置％ _母模 完成合模作業，如「第3圖」所示。 於道 201012623 參閱「第5圖」及「第6圖」所示，並參閱「第3圖」，合模 完成後’模穴動控制裝X 40之抽氣主機a啟動，且對應:負麼氣 間422開啟，使抽氣主機42持續對模穴13產生第—負壓，藉以使: 穴13之壓力小於外界壓力。 、 參閱「第5圖」、「第6圖」、及「第7圖」所示，注塑機5〇對模 具10注入注塑液，進行快速注塑。參閱「第6圖」所示，第— 注塑液加速進入模穴13中’是以此時具有相對較高之注塑液流量。同 時，發泡氣體源60也對注麵5G注人高壓空氣，使微小氣泡混入、主 塑液中。此時’由於歡動控制裝置⑽持續賴穴η施以一第二 負壓’因此加速氣泡成長至預定孔徑。由於第一負鱗續抽取模穴玷 中空部位（尚未填紐雛的區域）之缝，耻加粗餘進入模 中。W，由於歡η中的辑續被抽走，避免細微結構處 出現困氣現嫩嫩。，蝴㈣被加献 之工作溫度後才進行注塑，因此注塑液仍維持良好流動性，使位於模 鲁 =13表面處的氣泡可以持績移動至注麵前緣，避免注塑液冷卻固化 後於發泡塑料件表面形成氣痕。 ―第閱J 5圖」、「第6圖」、及「第7圖」所示，於開始快速注塑 ==之後’停止施加第一負壓。此-時間通常為注塑作 ，已注塑量大約是全部注塑量之-半。此時注塑液已經 、、主塑/^ 間，但是尚未堵塞進氣道⑶及排氣道阳。以 為注塑 秒為例，第一負壓時間約 _主要是要切斷抽氣::42:=°==止第-負 /、供八13的連通，因此只需要關 201012623 閉對應排氣道132之負壓氣閥422，就可以切斷第一負壓。抽氣主機 42可同時停止作業，也可於持續運轉。由於後續需要再度對模穴13施 予負壓，因此抽氣主機42以持續運轉為最佳。 參閱「第5圖」、「第6圖」、及「第7圖」所示，於第一負壓時間 結束之後，開啟正壓氣閥412，使高壓氣體源41連通模穴13，對模穴 13中的中空部位產生一正壓脈衝，注入特定量之高壓氣體。正壓脈衝 致使注塑液瞬間受壓’因而抑制;^小氣泡繼續成長，將氣泡固定於特 定直徑大小，同時避免新的氣泡持續產生，固定發泡塑料件成品中的 孔隙率。此時，由於正壓之作用下，注塑液流量會下降，使的已注塑 量增加之速率減緩（如「第6圖」所示），避免注塑機注入超過預定量 之注塑液。高壓氣體源41提供正塵脈衝之後，正壓氣閥412立刻關閉， 高壓氣體隨注魏的賴狀，由氣道其巾之_或是公模u及母模12 之間的缝隙慢慢離開模穴13。 參閱第5圖」、第6圖」、及「第7圖」戶斤示，於提供脈衝正壓 之後’可再度開啟負壓氣閥422，持續對模穴施以一第二負壓。第The operational flow of the embodiment of the present invention is as follows. See "Figure 5" and "Figure 6" together with "Figure 2" and "Figure 3". At the beginning of the riding and forming operation, or after the completion of the pre-foaming injection molding operation, the mold 1 is opened, and the mold opening device 2 drives the female mold U out of the male mold U to expose the surface of the cavity B. The foaming of the pre-primary injection molding (4) can also be taken out. At the same time, the heating main unit 31 of the temperature control device 3G starts to supply the high temperature fluid, and enters the passage 14 to start heating the mold 10 as shown in Fig. 1. The heating mold 10 is not subjected to the purchase of 4, 峨$ ω t峨 containing induction plus, electric heating rod heating, or direct fire heating. When the temperature of the surface of the cavity 13 reaches the operating temperature, the heating main unit 21 stops supplying the high-temperature fluid, so that the temperature control device 3 stops the heating mold (7) from accumulating. It is determined that the surface of the cavity is the temperature at which the temperature is reached, and the temperature of the surface of the hua 3 can be obtained by monitoring the _ scale temperature sensor.献' «Wei County-like secret time, the temperature of the surface of the __Juanlang cavity 13 (10) red temperature. After the temperature of the surface of the cavity 13 is turned to the temperature of the job, the % mold is completed, as shown in "Fig. 3". Yudao 201012623 See "Figure 5" and "Figure 6", and refer to "3rd figure". After the mold clamping is completed, the pumping host a of the X-axis control device X 40 is started, and the corresponding: negative? The air chamber 422 is opened, so that the air suction main unit 42 continues to generate the first negative pressure to the cavity 13, so that the pressure of the hole 13 is less than the external pressure. Referring to "5th drawing", "Fig. 6", and "Fig. 7", the injection molding machine 5〇 injects the injection molding liquid into the mold 10 to perform rapid injection molding. Referring to Fig. 6, the first injection molding solution is accelerated into the cavity 13 by the relatively high injection molding fluid flow rate. At the same time, the foaming gas source 60 also injects high-pressure air into the injection surface 5G to cause fine bubbles to be mixed into the main molding liquid. At this time, since the joy control device (10) continues to apply a second negative pressure η, the bubble is accelerated to a predetermined aperture. As the first negative scale continues to draw the seam of the hollow part of the cavity (the area that has not yet been filled with the new one), the shame is added to the mold. W, because the series in Huan η is being pumped away, avoiding the appearance of trapped air at the fine structure. , butterfly (four) is added to the working temperature before the injection molding, so the injection molding fluid still maintains good fluidity, so that the bubble at the surface of the mold = 13 can be moved to the front edge of the injection, to avoid the injection molding solution after cooling and solidification The surface of the foamed plastic part forms a gas mark. - "Reading J 5", "6th", and "7th" shows that the first negative pressure is stopped after the start of rapid injection molding ==. This time is usually injection molding, and the injection volume is about half of the total injection volume. At this point, the injection molding fluid has been, the main plastic / ^, but has not blocked the inlet (3) and exhaust yang. Taking injection molding seconds as an example, the first negative pressure time is about _ mainly to cut off the pumping: :42:=°== stop-negative/, for the connection of eight 13, so only need to close 201012623 closed corresponding exhaust The negative pressure air valve 422 of 132 can cut off the first negative pressure. The pumping main unit 42 can stop the operation at the same time or continue to operate. Since it is necessary to apply a negative pressure to the cavity 13 again, the suction main unit 42 is preferably operated continuously. Referring to "Fig. 5", "Fig. 6", and "Fig. 7", after the end of the first negative pressure time, the positive pressure air valve 412 is opened to connect the high pressure gas source 41 to the cavity 13 to the cavity. The hollow portion of 13 produces a positive pressure pulse that injects a specific amount of high pressure gas. The positive pressure pulse causes the injection molding fluid to be instantaneously pressed, thereby suppressing; the small bubbles continue to grow, the bubbles are fixed to a specific diameter, and the new bubbles are continuously prevented from occurring, and the porosity in the finished foamed plastic part is fixed. At this time, due to the positive pressure, the flow rate of the injection molding fluid is lowered, and the rate of increase in the injection molding amount is slowed down (as shown in Fig. 6), and the injection molding machine is prevented from injecting more than a predetermined amount of the injection molding liquid. After the high pressure gas source 41 provides the positive dust pulse, the positive pressure gas valve 412 is immediately closed, and the high pressure gas is separated from the cavity by the gap between the air passage and the male mold u and the female mold 12. 13. Referring to Figures 5, 6 and 7 of the figure, the negative pressure valve 422 can be opened again after the positive pulse pressure is applied, and a second negative pressure is continuously applied to the cavity. First
體源31提供冷卻流體， 14中，以排除殘存之高溫流體。接著以冷卻流 通入通道14中以冷卻模具1〇，加速模具1〇之 12 201012623 母模12脫離公模u，Body source 31 provides a cooling fluid, 14 to remove residual high temperature fluid. Then, the cooling flow is introduced into the passage 14 to cool the mold 1〇, and the mold 1 is accelerated. 12 201012623 The female mold 12 is separated from the male mold u.
33提供间壓空氣通入通道14中，以排除殘存之冷卻流體。接著 沒、:在胁、ΊΕ 1 Λ. 一 . . . / 向 溫度降溫至開模溫度„挺β ,Λ ........ ’通入通道14之中，開始加熱模具1〇， 溫流體源10開始提供高溫流體 以預備下一次射出成形作業。 本發明於發泡成形過程巾，制於模穴ls產生第—貞壓，加迷主 塑速度。同時透過模具1〇的預熱，維持注塑液的流動，輔以第—負壓 的產生’可以有效避免發泡腿件表面出現氣痕，使發泡塑料件具備 光滑的外觀，是以，透過本發贿作之發泡腿件可直翻以作為外 觀件。同時’第一負壓也抽取模穴13巾之困氣，避免困氣現象出現而 影響發泡塑料件之完整性。注塑過程中以正壓脈衝瞬間施壓，抑制氣 泡過度成長。同時，正壓脈衝暫時減緩注塑液流量，可適度調整注塑 量，避免注塑機注入過量注塑液。第二負壓可以再度加速注塑液流動， 以進一步縮短注塑所需要之時間。 【圖式簡單說明】 第1圖為習知技術中’微發泡塑料件射出成形系統之剖面示意圖。 第2圖為本發明實施例之系統方塊圖。 第3圖及第4圖為本發明實施例之剖面示意圖，揭示模具開模及 合模之狀態。 第5圖為本發明實施例中，注塑過程之時序示意圖。 第6圖為本發明實施例中，第一負壓、正壓脈衝、第二負壓影響 注塑液流量、已注塑量之曲線圖。 第7圖及第8圖為本發明實施例之剖面示意圖，揭示注塑液注入 13 201012623 模穴之狀態。 【主要元件符號說明】 「習知技術」 1 模具 2 發泡氣體源 * 3 注塑機 4 困氣 「實施例 j 10 模具 11 公模 111 澆注道 12 母模 13 模穴 131 進氣道 132 排氣道 14 通道 20 合模裝置 21 支架 22 油壓缸 23 驅動桿 24 基座 30 控溫裝置 31 加熱主機 312 201012623 32 322 33 332 40 41 412 ❹ 42 422 50 60 加熱閥門 冷卻主機 冷卻閥門 排液主機 排液閥門 模穴壓力控制裝置 局麼氣體源 正壓氣閥 抽氣主機 負壓氣閥 注塑機 發泡氣體源 ❿ 1533 provides an inter-pressure air passage passage 14 to remove residual cooling fluid. Then no,: in the threat, ΊΕ 1 Λ. I. . . / to the temperature to the mold opening temperature „ quite β, Λ........ 'pass into the channel 14, start heating the mold 1〇, The warm fluid source 10 begins to supply a high temperature fluid to prepare for the next injection molding operation. The present invention is used in a foam forming process towel to produce a first pressure in the cavity ls, to increase the speed of the main molding, and to preheat the mold through the mold. , to maintain the flow of the injection molding fluid, supplemented by the production of the first-negative pressure' can effectively avoid the appearance of gas marks on the surface of the foaming leg parts, so that the foamed plastic parts have a smooth appearance, so that the foaming legs are made through the bribe The piece can be turned directly to be used as the appearance part. At the same time, the first negative pressure also draws the trapping air of the cavity 13 to avoid the phenomenon of trapped air and affect the integrity of the foamed plastic part. The pressure is applied instantaneously by the positive pressure pulse during the injection molding process. At the same time, the positive pressure pulse temporarily slows the flow rate of the injection molding fluid, and the injection volume can be appropriately adjusted to prevent the injection molding machine from injecting excessive injection molding liquid. The second negative pressure can accelerate the flow of the injection liquid again to further shorten the time required for injection molding. [Simple diagram 1 is a schematic cross-sectional view of a micro-foamed plastic part injection molding system in a prior art. FIG. 2 is a block diagram of a system according to an embodiment of the present invention. FIGS. 3 and 4 are cross-sectional views of an embodiment of the present invention. The schematic diagram reveals the state of mold opening and closing. Fig. 5 is a timing diagram of the injection molding process in the embodiment of the present invention. Fig. 6 is a first negative pressure, positive pressure pulse, and second negative in the embodiment of the present invention. The pressure affects the flow rate of the injection molding liquid and the amount of the injection molding. Fig. 7 and Fig. 8 are schematic cross-sectional views showing the state of injection molding liquid injection into the mold hole of 13 201012623. [Explanation of main component symbols] 1 Mold 2 Foaming gas source* 3 Injection molding machine 4 trapping gas "Example j 10 Mold 11 Male mold 111 Pouring road 12 Master mold 13 Cavity 131 Inlet 132 Exhaust passage 14 Channel 20 Clamping device 21 Bracket 22 Hydraulic cylinder 23 Drive rod 24 Base 30 Temperature control device 31 Heating main unit 312 201012623 32 322 33 332 40 41 412 ❹ 42 422 50 60 Heating valve cooling main unit cooling valve draining unit Drain valve Cavity pressure control device Local gas source Positive pressure air valve Air suction main engine Negative pressure air valve Injection molding machine Foam gas source ❿ 15