CN202623248U - 一种双螺杆塑料挤出机用螺杆 - Google Patents

一种双螺杆塑料挤出机用螺杆 Download PDF

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CN202623248U
CN202623248U CN2012200346519U CN201220034651U CN202623248U CN 202623248 U CN202623248 U CN 202623248U CN 2012200346519 U CN2012200346519 U CN 2012200346519U CN 201220034651 U CN201220034651 U CN 201220034651U CN 202623248 U CN202623248 U CN 202623248U
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screw
section
plastifying
zone
twin
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Expired - Fee Related
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蔡炳然
黄铭生
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Guangdong Liansu Machinery Manufacturing Co Ltd
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Guangdong Liansu Machinery Manufacturing Co Ltd
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    • 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
    • B29C48/64—Screws with two or more threads
    • B29C48/655—Screws with two or more threads having three or more threads
    • 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
    • B29C48/40—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
    • 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
    • B29C48/575—Screws provided with elements of a generally circular cross-section for shearing the melt, i.e. shear-ring elements

Abstract

本实用新型涉及塑料成型设备，特别是一种双螺杆塑料挤出机用螺杆，包括依次连接的进料段、过渡段、塑化段、滞留段、排气段和挤出段，所述塑化段的螺牙边缘开有回流槽。本实用新型塑化段的螺牙边缘开有回流槽，材料可以反复在塑化段来回流动，使得材料充分混合均匀，有利于物料的塑化和混炼。能满足高填充配方（碳酸钙和PVC粉料的比例超过50%）生产时管材的质量要求。

Description

一种双螺杆塑料挤出机用螺杆
技术领域
本实用新型涉及塑料成型设备，特别是一种双螺杆塑料挤出机用螺杆。 
背景技术
国内外大多数厂家生产的锥型双螺杆塑料挤出机，只适合加工中低填充配方的PVC制品，一旦填充高填充配方（碳酸钙含量大于50%，即100份PVC配多于100份的碳酸钙），制得的塑料制品的质量就非常差，无法达到相关标准的要求。而在PVC管材市场，填充料（主要以碳酸钙为主）的比例越来越高，为了保证管材的质量，用于加工PVC管材的设备——锥型双螺杆塑料挤出机的螺杆必须做出相应的改进。中国国家知识产权局在2008年11月19日公开的公告号为CN201151186Y的专利公开了一种适用于双螺杆塑料挤出机的小锥角锥形螺杆，包括进料段、塑化段、压缩段、排气段和挤出段，具有使用寿命长、背压低、易塑化的优点，但仍无法满足高填充配方的生产要求。 
实用新型内容
本实用新型提供一种双螺杆塑料挤出机用螺杆，以解决现有技术挤出机用螺杆无法满足高填充配方的技术问题。 
采用的技术方案如下： 
一种双螺杆塑料挤出机用螺杆，包括依次连接的进料段、过渡段、塑化段、滞留段、排气段和挤出段，所述塑化段的螺牙边缘开有回流槽。
进一步的，所述回流槽为弧形。 
进一步的，所述双螺杆塑料挤出机用螺杆为锥形。 
本实用新型塑化段的螺牙边缘开有回流槽，材料可以反复在塑化段来回流动，使得材料充分混合均匀，有利于物料的塑化和混炼。能满足高填充配方（碳酸钙和PVC粉料的比例超过50%）生产时管材的质量要求。 
附图说明
图1 本实用新型实施例的结构示意图； 
图2为图1的结构剖面图；
图3为图1的A-A剖面图；
图4为图1的B-B剖面图。
具体实施方式
下面结合附图和具体实施例对本实用新型做进一步详细的说明。 
如图1和图2所示，本实施例为一种双螺杆塑料挤出机用锥形螺杆，包括依次连接的进料段1、过渡段2、塑化段3、滞留段4、排气段5和挤出段6，所述塑化段的螺牙边缘开有回流槽7。塑化段3的导程比常规短，滞留段4的导程比常规短。 
工作原理：生产PVC 管材，由于填充料的不同，需要设计不同的螺杆，保证PVC和添加剂的填充料的充分混合，从而保证管材的质量。当机筒开始加热到PVC粉料的塑化工艺温度，并把温度传递到螺杆后，到达同样的工艺温度后，填充料（例如碳酸钙）和PVC粉料从进料段1开始进入机筒，经过过渡段2、塑化段3、滞留段4和排气段5，从挤出段6出料。进入塑化段3后，由于塑化段3的导程比常规短，填充料和PVC粉料停留在螺杆混料的时间会比常规长，且带有回流槽7，物料可以反复在塑化段来回流动，使填充料和PVC粉料混炼的效果更好。充分混合后，混合物料进入滞留段4，该段的导程也比常规短，使物料在塑化段和滞留段形成更高的压力，有利于物料的塑化和混炼。混合物料通过这两段的塑化和混炼之后，充分塑化，经过排气段5和挤出段6的输送，就可以通过模具成型。这样，在碳酸钙和PVC粉料的比例很高的时候，也能得到较好质量的管材。 
在PVC管材市场，由于生产PVC管材的配方中，填充料（主要以碳酸钙为主）的比例越来越高，为了保证管材的质量，用于加工PVC管材的设备——锥型双螺杆挤出机的螺杆必须做出相应的改进。 
本实用新型的结构就是专门用于加工高填充配方（碳酸钙含量大于50%，即100份PVC配多于100份的碳酸钙）的。本实用新型设计了塑化段和滞留段的导程比常规的小，并且带回流槽；导程小，填充料和PVC粉料停留在螺杆混炼的时间长；带回流槽，材料可以反复在塑化段来回流动；螺杆的这两种特性使材料混合得比较充分。 

Claims (3)

1.一种双螺杆塑料挤出机用螺杆，其特征在于，包括依次连接的进料段（1）、过渡段（2）、塑化段（3）、滞留段（4）、排气段（5）和挤出段（6），所述塑化段（3）的螺牙边缘开有回流槽（7）。
2.根据权利要求1所述的双螺杆塑料挤出机用螺杆，其特征在于，所述回流槽（7）为弧形。
3.根据权利要求1所述的双螺杆塑料挤出机用螺杆，其特征在于，所述双螺杆塑料挤出机用螺杆为锥形。
CN2012200346519U 2012-02-03 2012-02-03 一种双螺杆塑料挤出机用螺杆 Expired - Fee Related CN202623248U (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104690943B (zh) * 2014-03-19 2018-04-13 保定东禾新型材料科技有限公司 一种挤出机用锥形螺杆
CN112553781A (zh) * 2020-11-03 2021-03-26 广西德福莱医疗器械有限公司 熔喷布挤出方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104690943B (zh) * 2014-03-19 2018-04-13 保定东禾新型材料科技有限公司 一种挤出机用锥形螺杆
CN112553781A (zh) * 2020-11-03 2021-03-26 广西德福莱医疗器械有限公司 熔喷布挤出方法

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Granted publication date: 20121226

Termination date: 20180203