201130636 六、發明說明： 【發明所屬之技術領域】 本發明關於一種用於製造由塑膠構成的大體積空心體 的製造裝i ’具有一個多部分式吹模，該吹模在打開的狀 態時容納一個由熱塑性塑膠構成的軟管前多層式坯件該 前达件從-共押出裝置的—喷嘴輸出，其中該前这件的= 少一層為一發泡體層。此外本發明還關於一種製造大體積 空心體的方法。 【先前技術】 虽使用一吹模成形方法製造大體積的空心體（它們包 含一塑膠發泡體層）時，如果在吹模程序時吹入空氣具= 小的壓力，俾不妨礙或抑制發泡體構造的形成，則甚有利， 如果（特別是在）在前坯件（v〇rformling，英：blank)從 共押出裝置推出後，施一壓力到該仍呈熱塑性的熔融物， 則發泡體構造破裂（zusarnmenbrechen)。因此人們設法在 吹模成形過程在空心體内部只產生一小小壓力，如果在該 多部分吹模的内壁與該空心體之間產生一真空，則在空心 體内部只需要小小的吹模壓力以在吹模内形成該空心體， 但在大體積的空心體的場合，要維持此真空，在技術上就 有問題，因為對於多部分式的吹模很難將吹模的分隔面沿 著一條較長的分隔線充分地密封。 在本申請人的EP 1 112 164 B1中提到—種製造大體積 的容器的方法，其中使用真空以形成空心體，此吹模褒置 201130636 設計成使空心體有一環境「壓榨邊緣」（Quetschrand，英： squeezing margin)環繞過其整個周圍，且將壓榨區域密封 成密不透氣。這種環繞的壓榨區域有一缺點，因為如此會 造成壁厚度分佈不均勻，而且結果使得空心體重量增加， 而且想使用發泡體構造以減少重量，其效果至少又打了折 扣0 在本申請人的WO 2005/097462A1提到一種製造具有 多層構造的軟管式前坯件的裝置與方法。由熱塑性塑膠構 成的一前坯件經一環形喷嘴推出，喷嘴利用—可往復運動 的尾座中心套筒（Pinole )開放及閉合。 【發明内容】 本發明的目的在提供一種製造具有至少一發泡體層的 由多層熱塑性塑膠構成的大體積空心體的方法與裝置，其 中用於製造高品質空心體的材料用量可減少。 此目的在裝置方面係利用申請專利範圍第丨項之各特 點的組合達成，本發明另一標的為一種製造方法。其有利 的進步特點見於申请專利範圍獨立項及以下之說明。 、依本發明，該製造裝置包含一真空室，它圍住該多部 分式吹模，且該關閉的多部分模係密不透氣地對外界大氣 密封。°人模包含至少一連接開口，它將吹模内部與真空室 内部接通。如果施真空到真空室，則前坯件被壓到多部分 人模的内面上，如此空氣經該空心的吹氣心轴（， ' b1〇wing mandrel )流入或吹入該密封的前达件的内部。 201130636 真空室設在喷嘴頭上或在其下方，喷嘴頭將該軟管狀前坯 推出如此，真空至有一内空間，它只比吹模的體積大― 點點。所要施到真空室的真空因此受限制材料的體積，如 此有經濟上的優點，利用上述的上軟管封閉裝置與下軟管 封閉裝置使前坯件夾入且提前造成密不透氣的封閉，而不 必對氣密性有高度要求。用此方式，前坯件安全地保持在 打開的吹模中，直到吹模在稍後的時間點擔任空心體的其 他成形作業為止。這種設計可避免有長長地環繞的壓榨邊 緣，如此可減少。隨後的吹模程序在封閉的真空室的内空 間達成，它完全圍繞著吹模和封閉的前坯件，因此可避免 空氣洩入造成真空度的損失^如此有利於形成均勻的壁厚 度，亦即勻均的發泡體層，如此可製造高品質的空心體。 依一實施例，該真空層的上側在其關閉的狀態時完全 封閉且距吹模的上側有一段距離，使得從該軟管封閉裝置 向上突出贅材部分（Butzenteil )可完全容納在吹模及真空 室的上側的上方的一個中間空間中。該贅材部在該前坯= (它從噴嘴頭被推出）切斷後，就倚在上軟管封閉裝置上， 因此真空室的上區域可完全封閉，而瞽姑邱八丁 a , 叩負柯邛分不會妨礙關 閉過程。 ~ 真空室的關閉狀態時呈密封方式倚靠在該其押出裝置的喷 嘴頭的函殼i。在喷嘴上推出的前达件藉著喷嘴縫隙關閉 而切斷，其贅材部分受重力落到上軟管封閉裝置上且不會 妨礙製造程序，在此變更實施例可省卻上軟管切斷裝置（它 201130636 將軟管形前坯件切斷）。用 簡化。 …用此方式，該裝置的結構進一步 ▲另一特點（它同時有關於本發明的裝置及方法）在於 3亥真空室的底設在距吹模 ； ,^ 模下側一段距離4，該距離使得一 個在下軟管封閉裝置的下方 τ置旳下方大出的贅材部分可完全容 吹模與真空室的底之間的一中間空間中。 ， 因此方式可防止在真空室關閉時，垂掛著 :到該真空室之隔開的底的分離區域中並造成真空的; 該裝置的另一實施例及製造方法的另一實施例的特點 為.該多部分式吹模與多部分式真空室互相牢牢連接，且 共同運動進到開放狀態及關閉狀態。用此方式可使裝置的 構造和製造程序進一步簡化。 本發明的實施例在以下配合圖式說明。 【實施方式】 圖1顯示用於製造由塑膠構成的大體積空心體的製造 置的第實施例。此製造裝置（ίο)由垂直方向看係設在 共押出裝置（12)下方且包含一雙殼式真空室（14)，真空室 中設有—雙殼式吹模（16)。真空室（14)W或吹模（16)也可由 多於二個的部分構成。 圖1中顯示真空室（14)與吹模（16)的打開狀態，吹模（16) 的各半。P與真空室（14)的相關側壁牢接（例如用螺合），用 此方式，它們可共同地利用一右邊的機器夾緊板（20)及一左 ⑧ 8 201130636 邊的機盗夹緊板（22)垂直於中央軸（is)移動到關閉狀態再由 關閉位置移到開放的狀態。在真空室（14)的上側（24)上方設 有一軟官切斷裝置（26) ’它適用於時熱塑性塑膠構成的前坯 件（2 8)切斷。 該共押出裝置（12)在圖中只顯示其一喷嘴頭（3〇)的部 分，在喷嘴頭内部利用一可垂直來回運動的「尾座中心套 筒」（Pinole ) (32)將一喷嘴縫隙（34)開放及關閉，軟管形 夕層式的則坯件（V〇rf〇rmling，英：blank ) (28)經該喷嘴 縫隙（34)推出，此前坯件（28)包含至少一個塑膠發泡體層。 在吹模（16)的上側設有一上軟管封閉裝置（36)，它可沿 橫方向運動，且在開放狀態可使前坯件（28)進入吹模（丨6)〔見 用虛線圖示的前坯件（28)〕。在圖丨中所示的關閉狀態，上 軟管封閉裝置（36)將軟管形前坯件（28)壓榨在一起，故軟管 形刖坯件（28)的上區域封閉，一利用軟管切斷裝置（26)切斷 的贅材部分（Butzenteil) (38)由於其重力而倚在軟管封閉 裝置（36)上。在吹模（16)與真空室（14)的上側（24)之間的中間 空間（40)彳艮大，使該贅材部分（38)完全容納在其中。 在吹模（16)下方設有一下軟管封閉裝置（42)，它在圖^ 中所示的關閉狀態時將前坯件（28)的下部段向一空心的吹 心軸（44)的周圍頂壓，並將前㈣（28)的下部段密封成密= 透氣，利用吹氣心軸（44)可將吹模空氣（46)吹入，如此，該 密封的前坯件（28)在一前模製階段吹脹成氣球形，如圖丨所 示。藉著將前坯件（28)的下區域鉗入產生—個下方的贅材 (Butzen ) (48)。在真空室（14)的底（52)與吹模⑽的下側之 9 201130636 門的中間工間(50)的尺寸可使該贅材㈣完全被此中間空間 容納。 雙殼式的真空室（丨4)的各周緣有密封手段（54)，當該真 空室（μ)的二個殼—起移行時，真空室的上側（24)中央也完 王封閉在真空室（14)的下區域中，底（52)有一開口（56)及 密封手段（54)，藉之可在真空室（14)的關閉狀態時對吹心轴 (44)呈密封《利用該環繞的密封手段(例如一橡膠密封 件）該封閉的真空室（14)可對外界大氣密封成密不透氣的方 式。一真空管路（58)以密不透氣的方式放入底（5 2)中。經由 此真空管路（58)可利用一真空裝置（圖未示）將一真空施到 真空室（14)的内部。此二部分式吹模（圖未示）將__真空施 到真空室（14)的内部。此二部分式吹模（16)包含連接開口 (60)。因此真空室（14)的真空也存在吹模（16)的内部。上軟 官封閉裝置（36)與下軟管封閉裝置（42)可利用機械式移動器 或油壓裝置移動。運動元件可同樣地在真空室（14)的内部與 外界大氣之間密封成密不透氣。 圖2顯示依圖1的實施例之吹模（16)與真空室（14)的關 閉狀態。相同部分用相同圖號表示。在關閉狀態時，真空 室（14)利用密封手段（54)封閉成完全密不透氣，上方的中間 空間（40)與下方的中間空間（5〇)完全容納之贅材（38)(48)，使 得真空室（14)的關閉過程不受妨礙。吹模（16)的各殼上有一 環繞的壓榨邊緣（62)，各殼上的壓榨緣在吹模（16)的關閉狀 態時互相配合並將前坯件（28)壓榨。下方的軟管封閉裝置 (42)再互相移行離開，因為此時不再要將前坯件（28)保持位 201130636 以及將贅材（48)壓榨。 以下利用圖1及圖2說明一個大體積空心的製造程 序’共押出裝置（12)將一多層式前坯件（28)經該開放的喷嘴 縫隙（34)推出，其中該尾座中心套筒（32)在圖1中沿軸向朝 下運動’以將喷嘴縫隙（34)開放。前坯件（28)的至少一層為 一塑膠發泡體層。此二部分互相牢接的二部分式真空室（14) 與該二部分式吹模（16)互相移離。因此該軟管形前坯件（28) 在推出時對應於虛線所示向下運動。軟管切斷裝置（26)、上 軟管封閉裝置（56)及下軟管封閉裝（42)在前述件（28)的放入 階段時也係打開著，如果有一預定量的塑膠材料被推出〔這 點相當於前坯件（28)的一預定位置〕，則將推出過程倚住， 且坯件（28)下軟管封閉裝置（42)封閉。在前坯件（28)的上區 域中，猶溫的熱塑性塑膠材料被壓榨在一起成為密不透氣 的方式，在前述坯件（28)的下區域中，這種壓榨作用沿著吹 u軸(44)的周圍造成。然後利用軟管切斷裝置(26)將前坯件 (28)切斷而贅材部分（38)由於其自身重量 裝綱上。、經由吹氣，將前卿)吹服成氣: 狀，俾給它某種起始穩定性。然後將吹模（16)及真空室（Μ) 關閉’其中㈣邊緣（62)將&件壓榨並將贅材部（叫及⑷） t納在凹隙(64)中（圖2)。當該二部分式吹模⑽的二部 齊移行時’前㈣⑽沿壓梓邊緣（62)熔接其中在下 區域中央該吹氣心軸（44)的開口保持開放。 當吹模（16)二部分共同移行時，真空室（14)的二部分也 一背移行。且㈣環繞的密封件㈣沿真空室（14)的分隔平 201130636 面造成密不透氣的密封。當真空室（14)—齊移行時，賢材 (38)(48)不會妨礙密封作用，因為贅材贅材（38)(48)完全 在中間空間（40)(5()) I依此，推出的前链件（28)的長度大 小使得下面垂掛的贅材部分(48)不會太長，俾能突伸到真空 室（14)的二部分式的底（52)的二部分間的中間空間。 在真空室（14)關閉成密不透氣以及吹模（16)關閉後，經 由真空管路（58)將真空施到内部，同時將吹模线〔它經吹 氣〜轴（44)流出〕的壓力減到_最小值。由於吹模（^ 中有 連接開口（60)，故前培件（28)利用真空被吸到吹模（16)的内 面上，且由於吹模（16)中的真空以及前坯件（28)内部的吹模 壓力之間的差別壓力而受壓迫。在此，前坯件（28)由於與吹 模（16)的壁有貼近的接觸而冷卻。同時，該經由吹氣心軸 冷卻空氣吹入前迷件（28)(它此時形成空心體的内部）。由 於剛坯件（28)内的空氣壓力小，故發泡體構造可在前坯件 (28)的塑膠發泡體層中完全形成。由於真空室密封性高故 不會有真空損失。因此可達成高品質，且空心體均勻形成。 在冷卻程序結束後，在吹模（16)與真空室（14)打開後將空心 體取出。 圖3顯示圖i的裝置的一變更例，同樣的部分再用相 同圖號展示。真空室（14)的上側有一開口（7〇)，它有一個端 側的密封件（54)，在圖示之真空室（14)的關閉狀態，密封件 (54)倚在噴嘴頭（3〇)的一函殼（72)上，在真空室（14)關閉後， 對外界大氣呈密封，且真空室内部可產生一穩定的真空， 而不會在分隔平面上造成漏洩的損失。中間空間（4〇)的尺寸 12 201130636 也使贅材（38)能完全容納。此處可省卻如圖丨的軟管切 置。藉著利用空心針（32)作控制將喷嘴縫隙（34)開放斷裝 閉。當喷嘴縫隙(34)封閉時該多層式前坯件也一齊;皮切:封 此塑膠空心體的製造程序一如上述製造程序達成。 空心體的體積可為50升〜40立方米’特別是2〇〇升 立方米。所用塑膠材料宜為聚乙烯㈣）、聚丙稀（pp) 用塑膠發泡體層為具有驅動劑（發泡劑）的pE或砰所 在前料内部中用於形成塑膠發泡體層的發泡構造 吹模壓力在1巴〜5巴範圍。且宜i巴〜2巴範圍。 在圖示之實施例，吹模與真空室互相牢接且互相同時 -齊運動。如不用此方式，吹模與真空室也可互相獨立地 運動。 【圖式簡單說明】 圖1係經該吹模與真空室的示意橫剖面圖，在其中容 納一軟管形的前坯件； 圖2係依圖1的裝置，公> 士 匕具有關閉的真空室和關閉的 吹模； 圖 3係真空室的另±Ir U)— ^實施例，匕以密封方式倚靠在噴 嘴頭的一函殼面上； ' 圖4係依圖3的實施你丨，p日+ 貝他例具有關閉的真空室和關閉的 吹模。 【主要元件符號說明】 13 201130636 (10) 製造裝置 (12) 共押出裝置 (14) 真空室 (16) 吹模 (18) 中央軸 (20) 機器夾緊板（右） (22) 機器夾緊板（左） (24) 〔真空室（I4)的上側〕 (26) 軟管切斷裝置 (28) 前述件 (30) 喷嘴頭 (32) 尾座中心套筒 (34) 喷嘴縫隙 (36) 上軟管封閉裝置 (38) 贅材部分 (40) 中間空間 (42) 下軟管封閉裝置 (44) 吹氣心軸 (46) 吹模空氣 (48) 贅材部分 (50) 中間空間 (52) 〔真空室（14)的〕底 (54) 密封手段 (56) 開口 ⑧ 14 201130636 (58) 真空管路 (60) 連接開口 (62) 壓榨邊緣 (64) 凹隙 (70) 開口 (72) 函殼201130636 VI. Description of the Invention: [Technical Field] The present invention relates to a manufacturing apparatus for manufacturing a large-volume hollow body made of plastic having a multi-part blow mold which is accommodated in an open state. A front multi-layer blank of a hose made of thermoplastic plastic is output from the nozzle of the co-extrusion device, wherein one layer of the previous one is a foam layer. Furthermore, the invention relates to a method of manufacturing a bulk hollow body. [Prior Art] Although a large-volume hollow body (which contains a plastic foam layer) is produced by a blow molding method, if air is blown at a small pressure during the blow molding process, the foam does not hinder or inhibit foaming. The formation of the body structure is very advantageous if, in particular, after the pre-blank (v〇rformling, English: blank) is pushed out from the co-extruding device, a pressure is applied to the still molten thermoplastic, then foaming Body structure rupture (zusarnmenbrechen). Therefore, it has been tried to generate only a small pressure inside the hollow body during the blow molding process. If a vacuum is generated between the inner wall of the multi-part blow mold and the hollow body, only a small blow mold is required inside the hollow body. The pressure is to form the hollow body in the blow mold, but in the case of a large-volume hollow body, maintaining the vacuum is technically problematic because it is difficult to separate the blow molding surface for the multi-part blow mold. A longer divider is adequately sealed. A method of making a large volume container is described in the applicant's EP 1 112 164 B1, in which a vacuum is used to form a hollow body, and the blow molding device 201130636 is designed such that the hollow body has an environmental "pressing edge" (Quetschrand) , English: squeezing margin) wraps around its entire circumference, and seals the press area into a tight airtight. This surrounding press area has a disadvantage because it causes uneven wall thickness distribution, and as a result, the weight of the hollow body is increased, and it is desirable to use a foam structure to reduce the weight, and the effect is at least discounted. WO 2005/097462 A1 mentions a device and a method for producing a hose-type front blank having a multi-layer construction. A front blank of thermoplastic material is pushed through an annular nozzle that is opened and closed by a reciprocating tailstock central sleeve (Pinole). SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for producing a bulky hollow body composed of a plurality of layers of thermoplastic plastic having at least one foam layer, wherein the amount of material used to manufacture the high quality hollow body can be reduced. This object is achieved in terms of apparatus by a combination of the features of the scope of the patent application, and another object of the invention is a manufacturing method. Its advantageous advancement characteristics are found in the separate items of the patent application and the following description. According to the invention, the manufacturing apparatus includes a vacuum chamber that encloses the multi-part blow mold, and the closed multi-part mold is tightly sealed to the outside atmosphere. The human mold includes at least one connection opening that connects the inside of the blow mold to the inside of the vacuum chamber. If a vacuum is applied to the vacuum chamber, the front blank is pressed onto the inner face of the multi-part phantom, such that air flows into or blows into the sealed front piece through the hollow blow mandrel ('b1〇wing mandrel) internal. 201130636 The vacuum chamber is located on or under the nozzle head. The nozzle head pushes the hose-like front blank so that the vacuum has an inner space which is only a little larger than the blow mold. The vacuum to be applied to the vacuum chamber is thus limited by the volume of the material, which has the economic advantage of using the upper hose closing device and the lower hose closing device described above to clamp the front blank and to form a tight seal in advance. There is no need to have a high degree of air tightness. In this way, the front blank is safely held in the open blow mold until the blow mold is used for other forming operations of the hollow body at a later point in time. This design avoids the need for a long circumferential press edge, which can be reduced. The subsequent blow molding process is achieved in the inner space of the closed vacuum chamber, which completely surrounds the blow mold and the closed front blank, thus avoiding the loss of vacuum caused by air leakage. This is advantageous for forming a uniform wall thickness. That is, a uniform foam layer, which can produce a high quality hollow body. According to an embodiment, the upper side of the vacuum layer is completely closed in its closed state and at a distance from the upper side of the blow mold, so that the portion of the coffin protruding upward from the hose closing device can be completely accommodated in the blow mold and In an intermediate space above the upper side of the vacuum chamber. The coffin portion is placed on the upper hose closing device after the front blank = (it is pushed out from the nozzle head), so that the upper portion of the vacuum chamber can be completely closed, and the abundance of the abalone is abundance. The score does not hinder the closing process. ~ The closed state of the vacuum chamber rests in a sealed manner against the envelope i of the nozzle head of the extrusion device. The leading member pushed out on the nozzle is closed by the nozzle slit, and the coffin portion is gravity-dropped onto the upper hose closing device without hindering the manufacturing process, and the modified embodiment can eliminate the upper hose cut. Device (it 201130636 cuts the hose-shaped front blank). Use simplification. ...in this way, the structure of the device is further ▲ another feature (which also has the device and method relating to the invention) is that the bottom of the vacuum chamber of the 3H is located at a distance of 4 from the bottom of the blow mold; A portion of the coffin that is placed below the lower portion of the lower hose closure can be fully accommodated in an intermediate space between the blow mold and the bottom of the vacuum chamber. Thus, in a manner that prevents the vacuum chamber from sag, it hangs: into the separate region of the bottom of the vacuum chamber and creates a vacuum; another embodiment of the device and a further embodiment of the method of manufacture are characterized by The multi-part blow mold and the multi-part vacuum chamber are firmly connected to each other and move together into an open state and a closed state. In this way, the construction and manufacturing process of the device can be further simplified. Embodiments of the invention are described below in conjunction with the drawings. [Embodiment] Fig. 1 shows a first embodiment for manufacturing a large-volume hollow body made of plastic. The manufacturing apparatus (ίο) is disposed below the co-extrusion device (12) in a vertical direction and includes a double-shell vacuum chamber (14) having a double-shell blow mold (16). The vacuum chamber (14) W or the blow mold (16) may also be composed of more than two portions. Figure 1 shows the open state of the vacuum chamber (14) and the blow mold (16), each half of the blow mold (16). P is in close contact with the relevant side walls of the vacuum chamber (14) (for example by screwing), in this way they can jointly utilize a right machine clamping plate (20) and a left 8 8 201130636 side pirate clamping The plate (22) is moved perpendicular to the central axis (is) to the closed state and then moved from the closed position to the open state. A soft cut-off device (26) is provided above the upper side (24) of the vacuum chamber (14). It is suitable for cutting the front blank (28) of thermoplastic material. The co-extrusion device (12) shows only a portion of a nozzle head (3 〇) in the figure, and a nozzle is used inside the nozzle head by a "tailstock center sleeve" (32) that can move vertically back and forth. The slit (34) is opened and closed, and the blank of the hose-shaped layer (V〇rf〇rmling, English: blank) (28) is pushed out through the nozzle slit (34), and the blank (28) contains at least one Plastic foam layer. An upper hose closing device (36) is provided on the upper side of the blow mold (16), which is movable in the transverse direction, and allows the front blank (28) to enter the blow mold (丨6) in an open state (see dotted line) The front blank (28) is shown. In the closed state shown in the figure, the upper hose closing device (36) presses the hose-shaped front blank (28) together, so that the upper portion of the hose-shaped blank (28) is closed, one is soft The coffin portion (38) cut by the pipe cutting device (26) rests on the hose closing device (36) due to its gravity. The intermediate space (40) between the blow mold (16) and the upper side (24) of the vacuum chamber (14) is enlarged so that the coffin portion (38) is completely accommodated therein. Below the blow mold (16) is provided a lower hose closing device (42) which, in the closed state shown in Fig. 2, directs the lower section of the front blank (28) toward a hollow blow mandrel (44) Pressing around and pressing the lower section of the front (4) (28) into a dense = venting air, the blown air (46) can be blown in by the blowing mandrel (44), thus, the sealed front blank (28) Inflated into a balloon shape in a pre-molding phase, as shown in Figure 。. By clamping the lower region of the front blank (28) into a lower slab (Butzen) (48). The intermediate compartment (50) of the door at the bottom (52) of the vacuum chamber (14) and the lower side of the blow mold (10) allows the coffin (4) to be completely accommodated by this intermediate space. The periphery of the double-shell vacuum chamber (丨4) has a sealing means (54). When the two shells of the vacuum chamber (μ) move up, the center of the upper side (24) of the vacuum chamber is also closed to the vacuum. In the lower region of the chamber (14), the bottom (52) has an opening (56) and a sealing means (54) for sealing the blow mandrel (44) in the closed state of the vacuum chamber (14). The surrounding sealing means (e.g., a rubber seal) encloses the vacuum chamber (14) in a manner that is impermeable to the outside atmosphere. A vacuum line (58) is placed in the bottom (52) in a gas tight manner. A vacuum (not shown) can be used to apply a vacuum to the interior of the vacuum chamber (14) via the vacuum line (58). This two-part blow mold (not shown) applies __ vacuum to the inside of the vacuum chamber (14). The two-part blow mold (16) includes a connection opening (60). Therefore, the vacuum of the vacuum chamber (14) also exists inside the blow mold (16). The upper soft closure (36) and the lower hose closure (42) can be moved using a mechanical mover or hydraulic device. The moving element can likewise be tightly sealed between the interior of the vacuum chamber (14) and the outside atmosphere. Fig. 2 shows the closed state of the blow mold (16) and the vacuum chamber (14) according to the embodiment of Fig. 1. The same parts are indicated by the same figure number. In the closed state, the vacuum chamber (14) is closed by a sealing means (54) to be completely airtight, and the upper intermediate space (40) and the lower intermediate space (5 inches) are completely contained in the coffin (38) (48). The process of closing the vacuum chamber (14) is not hindered. Each of the shells of the blow mold (16) has a circumferential press edge (62), and the press nips on each of the shells cooperate with each other in the closed state of the blow mold (16) and press the front blank (28). The hose closures (42) below are moved away from each other because the front blank (28) is no longer held at 201130636 and the coffin (48) is pressed. 1 and 2 illustrate a manufacturing process for a large hollow volume. The co-extrusion device (12) pushes a multi-layered front blank (28) through the open nozzle slit (34), wherein the tailstock center sleeve The barrel (32) moves axially downward in Figure 1 to open the nozzle gap (34). At least one layer of the front blank (28) is a plastic foam layer. The two-part vacuum chamber (14), which is in close contact with each other, is separated from the two-part blow mold (16). The hose-shaped front blank (28) thus moves downwards corresponding to the dotted line when pushed out. The hose cutting device (26), the upper hose closing device (56) and the lower hose closing device (42) are also opened during the insertion phase of the aforementioned member (28), if a predetermined amount of plastic material is The introduction [this corresponds to a predetermined position of the front blank (28)], the ejection process is tilted, and the blank (28) lower hose closing device (42) is closed. In the upper region of the front blank (28), the thermoplastic material of the temperature is pressed together to form a tight airtight manner. In the lower region of the aforementioned blank (28), the pressing action is along the blowing axis. Caused by (44) around. The front blank (28) is then cut by the hose cutting device (26) and the coffin portion (38) is fitted by its own weight. By blowing, the former Qing) is blown into gas: shape, 俾 gives it some initial stability. The blow mold (16) and the vacuum chamber (Μ) are then closed. The (four) edge (62) presses the & and the coffin portion (called (4)) is tipped in the recess (64) (Fig. 2). When the two-part blow mold (10) is moved in two directions, the front (four) (10) is welded along the crushing edge (62), and the opening of the blow mandrel (44) remains open in the center of the lower portion. When the two parts of the blow mold (16) move together, the two parts of the vacuum chamber (14) also move back. And (4) the surrounding seal (4) along the vacuum chamber (14) is separated by the flat 201130636 surface to create a tight seal. When the vacuum chamber (14) moves in alignment, the sapwood (38) (48) does not interfere with the sealing effect, because the coffin coffin (38) (48) is completely in the intermediate space (40) (5 ()) I Thus, the length of the front chain member (28) is such that the underlying coffin portion (48) is not too long and can protrude into the two portions of the two-part bottom (52) of the vacuum chamber (14). The middle space between the two. After the vacuum chamber (14) is closed and airtight and the blow mold (16) is closed, the vacuum is applied to the inside via the vacuum line (58) while the blow mold line (which flows out through the blow-shaft (44)) The pressure is reduced to _ minimum. Since the blow mold (there is a connection opening (60) in the mold, the front member (28) is sucked to the inner surface of the blow mold (16) by vacuum, and due to the vacuum in the blow mold (16) and the front blank (28) The differential pressure between the internal blow mold pressures is compressed. Here, the front blank (28) is cooled by close contact with the wall of the blow mold (16). At the same time, the air is cooled via the blow mandrel. Blowing in the front piece (28) (which now forms the interior of the hollow body). The foam structure can be in the plastic foam layer of the front blank (28) due to the small air pressure in the blank (28). Completely formed. Because the vacuum chamber is highly sealed, there is no vacuum loss. Therefore, high quality can be achieved and the hollow body is uniformly formed. After the cooling process is finished, after the blow mold (16) and the vacuum chamber (14) are opened, The hollow body is taken out. Figure 3 shows a modification of the device of Figure i, the same parts being shown again with the same figure. The upper side of the vacuum chamber (14) has an opening (7〇) with an end-side seal (54) ), in the closed state of the illustrated vacuum chamber (14), the seal (54) leans against a shell of the nozzle head (3〇) (72), after the vacuum chamber (14) is closed, the outside atmosphere is sealed, and a stable vacuum can be generated inside the vacuum chamber without causing leakage loss on the separation plane. The intermediate space (4 〇) Size 12 201130636 also allows the coffin (38) to be fully accommodated. This eliminates the need for a hose cut as shown in Fig. 。. The nozzle slit (34) is opened and closed by the use of a hollow needle (32). When the gap (34) is closed, the multi-layer front blank is also aligned; the skin cutting: the manufacturing procedure for sealing the plastic hollow body is achieved as described above. The volume of the hollow body can be 50 liters to 40 cubic meters 'especially 2 〇 Soaring cubic meters. The plastic material used should be polyethylene (4), polypropylene (pp). The plastic foam layer is used as the driving agent (foaming agent). The pE or crucible is used to form the plastic foam layer. The foaming structure has a blow mold pressure in the range of 1 bar to 5 bar. And it should be i bar ~ 2 bar range. In the illustrated embodiment, the blow mold and the vacuum chamber are intimately coupled to each other and simultaneously moved in unison. If this is not the case, the blow mold and the vacuum chamber can also move independently of each other. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view through the blow mold and vacuum chamber, in which a hose-shaped front blank is accommodated; Figure 2 is a device according to Figure 1, the male > Vacuum chamber and closed blow mold; Figure 3 is another ±Ir U) of the vacuum chamber - ^ embodiment, the 匕 rests on the shell surface of the nozzle head in a sealed manner; ' Figure 4 is the implementation of Figure 3丨, p-day + beta has a closed vacuum chamber and a closed blow mold. [Description of main component symbols] 13 201130636 (10) Manufacturing equipment (12) Common extrusion device (14) Vacuum chamber (16) Blow mold (18) Central shaft (20) Machine clamping plate (right) (22) Machine clamping Plate (Left) (24) [Upper side of vacuum chamber (I4)] (26) Hose cutting device (28) Front piece (30) Nozzle head (32) Tailstock center sleeve (34) Nozzle gap (36) Upper hose closing device (38) Coffin part (40) Intermediate space (42) Lower hose closing device (44) Blowing mandrel (46) Blowing air (48) Coffin part (50) Intermediate space (52 ) [Vacuum chamber (14)] bottom (54) Sealing means (56) Opening 8 14 201130636 (58) Vacuum line (60) Connection opening (62) Pressing edge (64) Notch (70) Opening (72) shell
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