CN102006981B - 用于挤出热塑性的塑料材料的装置 - Google Patents

用于挤出热塑性的塑料材料的装置 Download PDF

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CN102006981B
CN102006981B CN2009801138001A CN200980113800A CN102006981B CN 102006981 B CN102006981 B CN 102006981B CN 2009801138001 A CN2009801138001 A CN 2009801138001A CN 200980113800 A CN200980113800 A CN 200980113800A CN 102006981 B CN102006981 B CN 102006981B
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赫尔穆特·舒尔茨
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EREMA Engineering Recycling Maschinen und Anlagen GesmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
    • B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/428—Parts or accessories, e.g. casings, feeding or discharging means
    • B29B7/429—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/845—Venting, degassing or removing evaporated components in devices with rotary stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/268—Throttling of the flow, e.g. for cooperating with plasticising elements or for degassing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/455—Screws arranged to convey material towards each other, e.g. separate screws arranged after each other and feeding in opposite directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/55—Screws having reverse-feeding elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/74—Bypassing means, i.e. part of the molten material being diverted into downstream stages of the extruder
    • B29C48/745—Bypassing means, i.e. part of the molten material being diverted into downstream stages of the extruder for plasticising or homogenising devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/693—Substantially flat filters mounted at the end of an extruder screw perpendicular to the feed axis

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  • Engineering & Computer Science (AREA)
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Abstract

本发明涉及一种用于挤出热塑性的塑料材料的装置，其包括：在壳体(1)中支承的挤出机螺杆(2)，该挤出机螺杆包括进口侧的增塑部段(P)、在排料部段(A)上游的除气部段(E)和在增塑部段(P)与除气部段(E)之间的通流阻挡部(S)，该通流阻挡部包括一具有反向的输送螺纹(3)的螺杆部段；以及至少一个跨越通流阻挡部(S)的、包含熔体过滤器(4)的流动通道(5)。为了降低挤出机螺杆(2)的驱动功率建议，给构成通流阻挡部(S)的螺杆部段配置一不可相对旋转地支承于壳体(1)中的包围螺杆(6)的套筒(7)并且在通流阻挡部(S)的螺杆部段中的螺杆(6)具有一比增塑部段(P)并优选比除气部段(E)小的螺杆直径。

Description

用于挤出热塑性的塑料材料的装置
技术领域
本发明涉及一种用于挤出热塑性的塑料材料的装置，其包括：在壳体中支承的挤出机螺杆，该挤出机螺杆包括进口侧的增塑部段、在排料部段上游的除气部段和在增塑部段与除气部段之间的通流阻挡部(arrester)，该通流阻挡部包括一具有反向的输送螺纹的螺杆部段；以及至少一个跨越通流阻挡部的、包含熔体过滤器的流动通道。
背景技术
利用这样的装置拟可以将塑料、特别是塑料废料(它们在进一步加工之前需要除气过程或净化过程)符合目的地除气和处理。在处理来自生产废料或来自业已在循环中的塑料材料时，由于印刷、涂漆或污垢产生，必须在再利用之前净化这些塑料。
对此已知(WO 93/04841 A1)，将待处理的塑料在挤出机中熔化、通过过滤器挤压和在进一步加工或制粒之前除气。为了避免熔化的塑料材料从增塑部段向除气部段或排料部段那边的直接的转移和确保将全部的熔化的塑料导过熔体过滤器，在增塑部段与除气部段之间设置一反向的输送螺纹亦即反输送螺纹或密封螺纹的型式，它具有一个螺杆螺纹，该螺杆螺纹具有与增塑部段、除气部段和排料部段相反的导程。通过该已知的反输送螺纹将已导过熔体过滤器的和净化的塑料的一小部分重新送回增塑部段中，借此应该避免，未过滤的熔体直接在绕过熔体过滤器的情况下进入除气部段和排料部段。包括熔体过滤器的流动通道的进口和出口为了避免死区而直接设置在反输送螺纹的旁边。借此应该避免，导致塑料材料在装置中的过长的停留时间并因此导致塑料材料的热损坏。在该装置中的缺点特别是，反向的输送螺纹中是动态的密封件，它按照挤出机螺杆的转速是密封的或不是密封的。塑料的粘度在此也很重要，因为例如含有湿气的塑料形成蒸汽，不可能阻止该蒸汽从增塑部段通过输送螺纹向除气部段中的直接转移。这些蒸汽此外是污染物质的载体，它们经过过滤器被加入除气部段并且重新污染已过滤的塑料，因此不可能确保业已除气的和净化的塑料材料的恒定的质量。
因此也已建议(AT 503014)，挤出机螺杆在反向的输送螺纹与流动通道的出口之间应该构成一同向的输送螺纹并且壳体在反向的与同向的输送螺纹之间的过渡区域内具有至少一个除气口。借此可以避免通过通流阻挡部从增塑部段向除气部段中的气体转移并且因此也同样避免因溢流的气体或在装置中的压力波动导致塑料物质的污染。不过上述装置本身具有缺点，包括具有一反向的输送螺纹的螺杆部段的通流阻挡部对装置引起显著提高的驱动功率并且还引起装置的提高的磨损。
发明内容
从开头所述型式的现有技术出发，本发明的目的在于，避免上述各缺点并提供一种具有改进的除气效果的装置，其在降低用于挤出机螺杆的驱动功率和降低在通流阻挡部上的磨损的同时避免通过输送螺纹从增塑部段向除气部段内的直接的材料转移。
本发明这样达到提出的目的，即给构成通流阻挡部的螺杆部段配置在壳体中不可相对旋转地支承的、包围螺杆的套筒并且螺杆在通流阻挡部的螺杆部段中具有比增塑部段小并优选也比除气部段小的螺杆直径。
套筒或一不可相对旋转地装入装置壳体中的套筒与反向的输送螺纹一起构成通流阻挡部的螺杆部段，其中该螺杆部段相对于邻接的各螺杆部段(亦即相对于增塑部段且优选也相对于除气部段)的减小的直径保证了显著减低所需要的驱动功率，这由于较小的损耗功率也降低磨损。发生的磨损因此特别发生在套筒上而不在缸体上。为了更换，套筒可以与螺杆一起从缸体中拉出。
如果同时套筒的横截面的最大宽度小于或等于增塑部段和/或除气部段和必要时排料部段的外径，则可以将挤出机螺杆以通常的方式沿螺杆轴线与在构成通流阻挡部的螺杆部段的区域内包围螺杆的套筒一起共同装入和拆出。可以通过套筒的相应的外形(通过凹槽、榫头、楔、螺钉等)确保套筒的抗旋转的支承。
利用本发明可以提供这样的可能性，即，将挤出机螺杆在构成通流阻挡部的螺杆部段的区域内的直径一直减小到能够以要求的可靠性传递为除气和排料所需要的驱动力矩为止。
如果使用如一般通用的一件式的螺杆作为挤出机螺杆，那么建议将套筒在至少一个沿螺杆纵轴线的方向延伸的平面内构成分开的，以便能够实现套筒在输送螺杆上或输送螺杆在壳体中的安装和拆卸。
附加地或替代地，将挤出机螺杆沿螺杆纵向方向构成至少三部分的，其中各单个部分，亦即“增塑部段”部分、“具有通流阻挡部的螺杆部段”部分和“包括除气部段和排料部段的部段”部分，优选沿螺杆轴线相互拧接。因此可以无困难地分开制造各单个螺杆部段并紧接着在套筒在构成通流阻挡部的螺杆部段上预装以后相互拧紧，借此特别是很不同的螺杆几何形状的组合也无困难地实现。也可以更换一可能较快磨损的回导螺纹连同套筒，而不必重新制造整个的挤出机螺杆。
为了改进除气功率，挤出机螺杆可以在反向的输送螺纹与流动通道的出口之间按已知的方式构成一同向的输送螺纹，其中壳体在反向的输送螺纹与同向的输送螺纹之间的过渡区域内优选具有至少一个除气口。为了减小紧接在增塑部段之后的反向的输送螺纹由于渗入输送螺纹中的污染气体导致的磨损，有利的是，将流动通道在熔体过滤器的出口侧通过至少一个回导通道、优选经由一止回阀，与挤出机螺杆的反向的输送螺纹在进口侧连接。借此可以确保净化的塑料通过输送螺纹向增塑部段那边的针对性的微小的回流并因此避免污染的塑料渗入反向的输送螺纹中。
为了改进除气作用，可以在挤出机螺杆的反向的输送螺纹与同向的输送螺纹之间在套筒中设置一无螺纹的除气空间，它由挤出机螺杆和/或由套筒构成。经由除气口简单地从装置排出经由反向的和同向的输送螺纹渗入该区域的气体，借此确保要求的压力去耦并且可靠地避免污染的气体的转移。
附图说明
附图中借助以横剖面示出的按照本发明的装置的示意的实施例说明本发明。其中：
图1按照本发明的装置的部分剖开的横剖面图和
图2按照本发明的装置的一结构方案的部分剖开的剖面图。
具体实施方式
用于挤出热塑性的塑料材料的装置包括一在壳体1中支承的挤出机螺杆2，其具有进口侧的增塑部段P和在简示的排料部段A上游的除气部段E。在增塑部段P与除气部段E之间设置一个构成一通流阻挡部S的螺杆部段，该通流阻挡部具有一具有反向的输送螺纹的螺杆部段。此外壳体1包含至少一个跨越通流阻挡部S的、包括熔体过滤器4的流动通道5。为了降低挤出机螺杆2的驱动功率和磨损，给构成通流阻挡部S的螺杆部段配置不可相对旋转地支承于壳体1中的、包围螺杆6的套筒7，并且在通流阻挡部S的螺杆部段中的螺杆6具有一比增塑部段P和比除气部段E小的螺杆直径。在所示的实施例中通过一锁紧螺钉8实现套筒7的不可相对旋转。
此外套筒7的横截面的最大宽度等于在增塑部段P和除气部段E中的螺杆的外径，借此可以将挤出机螺杆2无困难地沿挤出机螺杆轴线9与套筒7一起装入或拆出。
为了能够安装通流阻挡部S或为了在通流阻挡部S的磨损时只须将其更换，挤出机螺杆2沿螺杆纵向方向构成三部分的。该三部分是为增塑部段P配置的挤出机螺杆2的部分10、为通流阻挡部S配置的挤出机螺杆2的螺杆6和为除气部段E和排料部段A配置的挤出机螺杆2的部分11。这三个部分之间通过插入相应的补偿垫圈12相互拧接。为了分离这三个部分，在螺纹锈蚀卡住时可能需要在各垫圈12的区域内切开或锯开各部分。
在按图2的实施例中，螺杆6在反向的输送螺纹3与流动通道5向除气部段E中的出口13之间构成一同向的输送螺纹14。此外，流动通道5在熔体过滤器4的出口侧通过一回导通道15、经由一止回阀16与挤出机螺杆2的反向的输送螺纹3在进口侧连接。为此在套筒7中设置一径向开口17。此外在反向的输送螺纹3与同向的输送螺纹14之间设置一无螺纹的除气空间18，其由螺杆6构成并且经由套筒7中的除气口19从装置通出。
作为另一替代方案，在按图1的实施例中可以以同样的方式设置回导通道15，其中流动通道5的出口侧开口13优选以同样的方式通入挤出机螺杆2的为除气部段E配置的部分11中，如图2中所示。

Claims (10)

1.用于挤出热塑性的塑料材料的装置，其包括：在壳体(1)中支承的挤出机螺杆(2)，该挤出机螺杆包括进口侧的增塑部段(P)、在排料部段(A)上游的除气部段(E)和在增塑部段(P)与除气部段(E)之间的通流阻挡部(S)，该通流阻挡部包括一具有反向的输送螺纹(3)的螺杆部段；以及至少一个跨越通流阻挡部(S)的、包含熔体过滤器(4)的流动通道(5)，其特征在于，构成通流阻挡部(S)的螺杆部段被不可相对旋转地支承于壳体(1)中的、包围螺杆(6)的套筒(7)包围，并且在通流阻挡部(S)的螺杆部段中的螺杆(6)具有比增塑部段(P)小的螺杆直径。
2.按照权利要求1所述的装置，其特征在于，套筒(7)的横截面的最大宽度小于或等于增塑部段(P)和/或除气部段(E)的外径。
3.按照权利要求1或2所述的装置，其特征在于，套筒(7)在至少一个沿螺杆纵轴线(9)的方向延伸的平面内构成分开的。
4.按照权利要求1或2所述的装置，其特征在于，挤出机螺杆(2)沿螺杆纵向方向构成三部分的，其中各单个部分，亦即增塑部段(P)、包含通流阻挡部(S)的螺杆部段以及包含除气部段(E)和排料部段(A)的部段，相互拧接。
5.按照权利要求1或2所述的装置，其特征在于，流动通道(5)在熔体过滤器(4)的出口侧通过至少一个回导通道(15)经由套筒(7)的径向开口与挤出机螺杆(2)的反向的输送螺纹(3)在进口侧连接。
6.按照权利要求1或2所述的装置，其特征在于，挤出机螺杆在反向的输送螺纹(3)与流动通道的向除气部段那边的出口侧开口之间构成同向的输送螺纹，并且套筒(7)在反向的输送螺纹和同向的输送螺纹之间的过渡区域内具有至少一个除气口(19)。
7.按照权利要求6所述的装置，其特征在于，在挤出机螺杆(2)的反向的输送螺纹与同向的输送螺纹之间设置无螺纹的除气空间(18)，其由挤出机螺杆(2)和/或套筒(7)构成或者说限定。
8.按照权利要求1或2所述的装置，其特征在于，在通流阻挡部(S)的螺杆部段中的螺杆(6)具有比除气部段(E)小的螺杆直径。
9.按照权利要求1或2所述的装置，其特征在于，挤出机螺杆(2)沿螺杆纵向方向构成三部分的，其中各单个部分，亦即增塑部段(P)、包含通流阻挡部(S)的螺杆部段以及包含除气部段(E)和排料部段(A)的部段，沿螺杆轴线(9)相互拧接。
10.按照权利要求1或2所述的装置，其特征在于，流动通道(5)在熔体过滤器(4)的出口侧通过至少一个回导通道(15)经由止回阀(16)经由套筒(7)的径向开口与挤出机螺杆(2)的反向的输送螺纹(3)在进口侧连接。
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