CN104169063A - 挤出机混合元件 - Google Patents

挤出机混合元件 Download PDF

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CN104169063A
CN104169063A CN201280070881.3A CN201280070881A CN104169063A CN 104169063 A CN104169063 A CN 104169063A CN 201280070881 A CN201280070881 A CN 201280070881A CN 104169063 A CN104169063 A CN 104169063A
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CN104169063B (zh
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B·帕德马纳班
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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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    • 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
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B29B7/489—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
    • B29B7/34—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
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
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    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
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    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
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    • B29B7/484—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with two shafts provided with screws, e.g. one screw being shorter than the other
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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
    • B29C48/251—Design of extruder parts, e.g. by modelling based on mathematical theories or experiments
    • B29C48/2517—Design of extruder parts, e.g. by modelling based on mathematical theories or experiments of intermeshing screws
    • 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
    • B29C48/395—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
    • B29C48/40—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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin 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
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    • 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
    • B29C48/40—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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/405—Intermeshing co-rotating screws
    • 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
    • B29C48/57—Screws provided with kneading disc-like elements, e.g. with oval-shaped 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
    • B29C48/505—Screws
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • 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
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • B29C48/61—Threads having wavy profiles
    • 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
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    • B29C48/655—Screws with two or more threads having three or more threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
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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
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    • B29C48/40—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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/402—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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts

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Abstract

本发明公开了一种同向旋转双螺杆挤出机用分散混合元件。所述同向旋转双螺杆挤出机用元件包含一呈螺旋形连续分布的叶片，并有一个导程“L”，在一小部分导程“L”上所述叶片至少一次从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上所述叶片至少一次从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。

Description

挤出机混合元件
本发明涉及一种挤出机用螺杆元件。具体地，本发明涉及一种同向旋转双螺杆挤出机用混合元件。
背景技术
同向旋转双螺杆挤出机不仅广泛地应用于塑料的生产、混合和加工,也广泛地应用在其它工业如橡胶、食品、涂料和医药加工。同向旋转挤出机现今以一种模块化的模式制造，其中不同的加工元件安装在螺杆轴上从而允许挤出机可以适应不同的工艺要求。相对于单螺杆机(其螺旋叶片刮削外壳的内部(含间隙))，紧密啮合的同向旋转挤出机的一个基本特质方面在于除了留有必要的间隙外，叶片紧密地啮合，同时由于叶片被专门设计为相互清洁，其螺杆被认为是“自擦拭的”或者“自清洁的”。同向旋转双螺杆挤出机的演变、工作原理和设计原理是众所周知的，并且在慕尼黑卡尔汉斯出版社(Carl Hanser Publishersof Munich)出版Klemens Kohlgruber编著的2008版《同向旋转双螺杆挤出机－基本原理、技术和应用》一书中有简要解释。
除了进料和传料外，同向旋转挤出机承担的最重要的任务就是混合原料以制备一种均质的熔化物。同向旋转挤出机的混合大致分为两类：分布混合和分散混合。如上述Klemens Kohlgruber编著一书中第9章第159-169页中所讲，分布混合是指在所考虑的体积范围内，对不同成分和颗粒的分布，而无需减小所述成分和颗粒的尺寸。在纯分布混合中，不需施加高的流体力。对混合质量而言，重排过程的类型和数量起着决定性的作用，而非延伸率和剪切的绝对值。经过无限的混合时间，也就是说经过无限次的重排，从理论上来说就会获得完全均质的混合物。相对于分布混合，分散混合首先包括分解或者分散固体颗粒、液滴或者气泡，通常包括减小成分或者颗粒的尺寸。为了实现分散，必须施加足够高的流体力以打碎团聚体或者克服熔体或者液体界面处的表面张力。分散混合取决于延伸率和剪切的绝对值和所施加力的持续时间。
如美国专利6974243中所描述，在分散和分布混合中，常常使用捏合块，所述捏合块包含多个具有Erdmenger轮廓的捏合盘，捏合盘一个接一个轴向分布且彼此之间错角排列。捏合盘之间分别成对排列，在同向旋转挤出机的双螺杆上彼此相对排列，且彼此间紧密啮合。在传统捏合块中的混合过程被认为是一个随机过程，也就是说，在各个体积成分中的混合工作的强度是变化的。因此，为了获得一种高度均匀的混合物，需花费大量的机械能来确保尽可能的使每一体积单位均发生剪切。在各捏合盘的作用下，在所有情况下，相对小部分的处理原料被强烈地剪切，但是大多数原料则逃避了位于剪切盘和筒壁之间和位于两个捏合盘之间的剪切间隙，因此剪切很少。考虑到这个原因，为了确保混合物的高度均匀，需要很长的已知类型的捏合块或高的旋转速度。在任何情况下，相当的机械能被消耗并且以热的形式引入到被加工的原料上。特别地，在橡胶混料过程中，生成相当大量的热量是非常不利的。美国专利697423还描述了可进行单叶和三叶互相转换的元件。但是，该公开的元件不具有“自清洁的”功能。
由于对于更加均一的熔化物来说分布混合和分散混合均是需要的，因此对挤出元件进行优化通常是对两种混合类型的优点和缺点的一种折衷。美国专利5932159描述了熟知的用于分布混合和分散混合的不同类型的挤出元件。同向旋转挤出机分布混合能力的增强通常会导致挤出机清洁能力的丧失或者降低。
因此本领域长期需要获得一种同向旋转挤出机用挤出元件，其可以消除或者减少对原料的峰值剪切，增强分布混合以便于获得更加均一的混合物和更好的熔融温度控制能力，同时还可以保持挤出机的自清洁能力。
发明内容
本发明公开了一种同向旋转双螺杆挤出机用元件。该同向旋转双螺杆挤出机用元件包含呈螺旋形连续分布的叶片，在该叶片上有导程“L”,其中在一小部分导程“L”上叶片至少一次从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上叶片至少一次从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
附图说明
附图说明阐明了本发明的优选实施例，与下文的具体实施方式一起阐释了本发明的原理。
图1(a)为根据本发明的一个实施例组装的一对同向旋转挤出元件。
图1(b)为根据本发明的一个实施例图1所示元件的元件轮廓沿着元件轴的转换。
图2为根据本发明的一个实施例的元件的立体等比例视图。
图3为根据本发明的一个实施例的图2所示元件的另一立体等比例视图。
图4为图2和图3所示元件沿元件轴线X1-X2的等比例线图。
图5为图4所示元件的左视图。
图6为图4所示元件的右视图。
图7为将图4所示元件沿着X1-X2轴线逆时针旋转所得的右视图。
图8也为将图4所示元件沿着X1-X2轴线逆时针旋转，且为从元件轴线X1-X2的X2端观察所得的右视图。
图9为图8所示元件的立体元件图。
图10为图4所示元件的主视图。
图11为图4所示元件的后视图。
具体实施方式
同向旋转挤出机包括一个外壳，其具有两个圆柱形壳腔且每个壳腔中具有轴线，该轴线与另一轴线平行布置。第一螺杆轴和第二螺杆轴分别布置在第一和第二壳腔中。挤出机的加工元件安装在第一和第二螺杆轴上，并在挤出机内限定了混合区。挤出元件可包含开槽轴腔(在该轴腔中，螺杆轴的花键(splines)啮合在其上)或安装在螺杆轴上的其它装置。
挤出元件包含一个或多个叶瓣，上述叶瓣在元件上形成叶片。叶瓣的数量通常为整数，一般在一到三个叶瓣之间变化。这样的挤出元件在本发明中是指“整数叶元件”。叶瓣的数量还可以是非整数的，这样的元件是指“非整数叶元件”或者过渡叶元件。
公开了一种同向旋转双螺杆挤出机用元件。该元件包含一个导程“L”，且在其上有一呈螺旋形分布的叶片。形成的叶片呈连续分布，没有任何断层或者中断。在一小部分导程“L”上，叶片至少一次从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上叶片至少一次从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。元件轮廓的转换在元件上至少形成一个销(pin)或者一个槽或者两者都有，这使得一对元件组装后，一个元件的销轮廓与另一个元件的槽轮廓啮合。
参见图1(a)，显示了根据本发明的一个实施例组装的一对同向旋转挤出元件。每个元件长40mm，导程“L”长亦为40mm。在A点，元件的轮廓为整数叶元件，在本例中为双叶。元件在A点的轮廓如图1(b)中轮廓1所示。轮廓2到40为非整数叶轮廓。元件从轮廓1转换为轮廓2，并依此类推，直至轮廓40。元件从轮廓1(即整数叶元件轮廓)转换为轮廓40(即非整数叶元件轮廓)，这发生在一小部分导程“L”上，在所公开的实施例中为5mm。元件在下一个5mm中接着从轮廓40转换为轮廓1。元件从轮廓40转换为轮廓1使得在一小部分导程“L”上元件轮廓从非整数叶转换为整数叶。在图1的实施例中，轮廓1为双叶元件，轮廓40为1：2：50分数叶元件。
在图1的实施例中，从整数叶叶片转换为非整数叶叶片以及从非整数叶叶片转换为整数叶叶片，发生于10mm或一小部分导程“L”中。
此外，根据一个实施方式，从整数叶叶片到非整数叶叶片再到整数叶叶片的转换或者相反转换可发生多次。在图1的实施例中，从整数叶叶片到非整数叶叶片的转换和相反转换沿着元件的长度重复4次，从而形成40mm的元件。
尽管在图1的实施例中阐释了在一小部分导程“L”上从整数叶叶片到非整数叶叶片的转换以及在一小部分导程“L”上进行相反转换，但元件同样可以在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片以及在一小部分导程“L”上再转换为非整数叶叶片。
依据一个实施例，元件具有多个叶片和一个导程“L”。至少一个叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者叶片至少一次在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。依据另一实施例，元件具有多个叶片和一个导程“L”，且每个叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者上述叶片至少一次在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
一个非整数叶元件可以是一个分数叶元件。一个分数叶元件是指一个介于第一整数元件(n)和第二整数元件(N)之间的预定分数的元件，使得N/n是一个整数且上述分数决定了第一整数和第二整数的转换程度。单叶片叶和双叶可以形成分数叶，如1.2.xx，其中xx可以是1-99的任意数字。数字1-99决定了上述分数叶看起来是否更像一个单叶元件或者双叶元件。数字1和2在符号1.2.xx中代表介于单叶片元件(1)和双叶片元件(2)之间的叶片元件。一个从单叶片和双叶片形成的分数叶元件的例子在图1中进行了阐述并且在美国专利6783270中有更完整的描述。
一个单叶片元件和一个四叶元件也可以形成一个命名为1.4.xx的分数元件，其中xx可以是1-99的任意数字。因此一个以1.4.50命名的分数叶元件代表一个元件，其介于单叶片和四叶元件的中间。类似地，还可以组合一个单叶元件和一个三叶元件[1.3.xx]或者一个双叶和一个四叶元件[2.4.xx]。这些组合会产生大量的分数叶元件。
一个非整数叶元件可以是一个无理数叶元件。在专利WO2011/073121中描述了无理数叶元件，同样的内容通过引用并入本文。
本发明公开的元件可以在一小部分导程“L”上从一个规则的或者整数叶叶片转换为一个分数叶叶片然后再反转换，或者可以在一小部分导程“L”上从一个规则的或者整数叶叶片转换为一个无理数叶叶片然后再反转换。
参见图2至图9，根据本发明的一个实施例，其中给出了元件(100)的不同视图。图2和图3示意了元件(100)的立体等比例视图，其具有一个中腔(101)且在其上有形成的花键，以便将上述元件安装在挤出机的螺杆轴上。中腔沿着元件的轴线X1-X2延伸。图2示意了从元件轴的X2端观察元件，图3示意了从元件轴的X1端观察元件。元件从整数叶元件转换为非整数叶元件，即分数为1：2：50的分数叶元件，然后再沿着X1-X2轴线转换为整数叶元件共4次。销(102)和槽(103)在元件上形成。
图4示意了图2和图3所示元件沿元件轴线X1-X2的等比例线图。图5示意了图4所示元件的左视图或者从横截面轴线A-B的A侧观察图4所示元件的示意图，而图6示意了图4所示元件的右视图或者从横截面轴线A-B的B侧观察图4所示元件的示意图。
图7示意了将图4所示元件沿着X1-X2轴线逆时针旋转后从横截面轴线A-B的B侧观察图4所示元件的示意图。图8也示意了将图4所示元件沿着X1-X2轴线逆时针旋转后从横截面轴线A-B的B侧并且从元件轴的X2端观察图4所示元件的示意图。图9为图8所示元件的立体元件图。
图10和图11为图4所示元件的主视图和后视图。正如从元件的正面和背面来看，在元件的末端元件为一个双叶元件，沿着元件轴线X1-X2转换为非整数元件后再反转换。
具体实施例描述如下
本发明公开了一种同向旋转双螺杆挤出机用元件。该同向旋转双螺杆挤出机用元件包括一个呈螺旋形的连续的叶片，在其上有一个导程“L”，其中在一小部分导程“L”上叶片至少一次从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上叶片至少一次从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
所述同向旋转双螺杆挤出机用元件中，非整数叶叶片为分数叶叶片。
所述同向旋转双螺杆挤出机用元件中，非整数叶叶片为无理数叶片。
所述同向旋转双螺杆挤出机用元件中，在一小部分导程“L”上叶片从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上叶片从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片，所述转换过程会在元件上形成销和槽。
所述同向旋转双螺杆挤出机用元件中，元件具有多个叶片和一个导程“L”，其中至少一个叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者所述叶片至少一次在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
所述同向旋转双螺杆挤出机用元件中，元件具有多个叶片和一个导程“L”，其中每个叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者所述叶片至少一次在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
所述同向旋转双螺杆挤出机用元件中，叶片在一小部分导程“L”上多次从整数叶叶片转换为非整数叶叶片然后再在一小部分导程“L”上转换为整数叶叶片。
所述同向旋转双螺杆挤出机用元件中，在一小部分导程“L”上叶片从整数叶叶片转换为非整数叶叶片，然后再转换为整数叶叶片。
工业应用
本发明公开的元件是一种适用于同向旋转双螺杆挤出机的混合元件。所述元件可用来获取一种均质的熔体混合物且可以通过剧烈剪切减少原料的降解。所述元件不影响同向旋转挤出机的自清洁功能。

Claims (8)

1.一种同向旋转双螺杆挤出机用元件，所述元件包含一呈螺旋形连续分布的叶片，并具有一个导程“L”，其中在一小部分导程“L”上所述叶片至少一次从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上所述叶片至少一次从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
2.如权利要求1所述的元件，其特征在于，所述非整数叶叶片为分数叶叶片。
3.如权利要求1所述的元件，其特征在于，所述非整数叶叶片为无理数叶片。
4.如权利要求1所述的元件，其特征在于，所述叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者在一小部分导程“L”上叶片从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片，所述转换在元件上形成销和槽。
5.如权利要求1所述的元件，其特征在于，所述元件具有多个叶片和一个导程“L”，其中至少一个叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者所述叶片至少一次在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
6.如权利要求1所述的元件，其特征在于，所述元件具有多个叶片和一个导程“L”，其中每个叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片且在一小部分导程“L”上再转换为整数叶叶片，或者所述叶片至少一次在一小部分导程“L”上从非整数叶叶片转换为整数叶叶片且在一小部分导程“L”上再转换为非整数叶叶片。
7.如权利要求1所述的元件，其特征在于，所述叶片在一小部分导程“L”上多次从整数叶叶片转换为非整数叶叶片然后再在一小部分导程“L”上转换为整数叶叶片。
8.如权利要求1所述的元件，其特征在于，所述叶片在一小部分导程“L”上从整数叶叶片转换为非整数叶叶片，然后再转换为整数叶叶片。
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