CN107471584A - 一种降低pvc双壁波纹管废品率机构及其方法 - Google Patents

一种降低pvc双壁波纹管废品率机构及其方法 Download PDF

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CN107471584A
CN107471584A CN201710698618.3A CN201710698618A CN107471584A CN 107471584 A CN107471584 A CN 107471584A CN 201710698618 A CN201710698618 A CN 201710698618A CN 107471584 A CN107471584 A CN 107471584A
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邓添华
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Heshan Liansu Industrial Development Co Ltd
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    • 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
    • B29C48/03—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
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    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

本发明涉及管道产品生产应用的技术领域，更具体地，涉及一种降低PVC双壁波纹管废品率机构及其方法。本发明结构紧凑，生产操作更为简单；气辅成型，产品内外层结合更加紧密。创新流道结构设计，减少生产烧料，产品发黄、使用开裂问题。可适应同类型PVC管道产品生产，降低生产废品率。

Description

一种降低PVC双壁波纹管废品率机构及其方法
技术领域
本发明涉及管道产品生产应用的技术领域，更具体地，涉及一种降低PVC双壁波纹管废品率机构及其方法。
背景技术
PVC双壁波纹管产品为双壁复合结构，常规模具生产管材时候采用在模体中部设置分流梭进行内外层分流，因模具中部熔体逐步压缩，压力急剧增加，分流难以平衡，且该产品本身为薄璧产品，产品成型时容易烧料，产品成型后容易出现发黄、开裂。另外由于冷却定型吸附的为管材外表面，有可能造成管材内外层不能紧密贴合，给安装使用过程中带来隐患。
发明内容
本发明为克服上述现有技术所述的至少一种缺陷，提供一种降低PVC双壁波纹管废品率机构及其方法，适合于PVC双壁波纹管产品的生产方法，从而降低生产废品率。
本发明的技术方案是：一种降低PVC双壁波纹管废品率机构，其中，包括模座、设于模座内的中心分流锥及双层分流锥，还包括双支架分流梭，双支架分流梭分别连接外层收缩体、外层模芯、内层收缩芯及中心收缩芯，外层收缩体与外层模芯形成的外层熔体运行通道，内层收缩芯与中心收缩芯形成的内层熔体运行通道；
还包括外层口模、内层口模与内外模芯，外层口模与外层模芯形成的外层定型通道，内层口模与内外模芯形成的内层定型通道。
进一步的，PVC双壁波纹管模具还设有用于调整外层口模进行位移的调节螺钉。
PVC双壁波纹管模具中部设置有散热装置，通过散热进气孔引入冷气；散热进气孔侧部设有真空吸气口。
PVC双壁波纹管模具还包括压板，通过压板固定螺钉使压板固定外层口模与模座。PVC双壁波纹管模具还包括外层收缩体固定螺钉。
利用所述的降低PVC双壁波纹管废品率机构的方法，其中：包括以下步骤：
S1. 熔体通过模座入料口进入模具，并经过中心分流锥及双层分流锥的导流作用将熔体由一股料流分成两股料流；
S2. 分成两股的熔体，通过双支架分流梭的引导进入模具中部，双支架分流梭分别连接外层收缩体、外层模芯、内层收缩芯及中心收缩芯；外层收缩体与外层模芯形成的外层熔体运行通道，通道由宽逐渐变窄，逐步将熔体压缩密实，确保外层熔体内部分子彻底融合；内层收缩芯与中心收缩芯形成的内层熔体运行通道，通道由宽逐渐变窄，逐步将熔体压缩密实，确保内层熔体内部分子彻底融合；
S3. 经过逐步压缩的内外层的熔体，继续在模体中往前运行，为符合定型冷却的尺寸要求，熔体需进一步的通过口模、模芯成型段进一步的压缩定型，改变熔体的壁厚大小及外形尺寸；其中，外层口模与外层模芯形成的外层定型通道，将熔体逐步由厚变薄，外径尺寸由大变小，形成一个拉伸，增强产品强度；内层口模与内外模芯形成的内层定型通道，将熔体逐步由厚变薄，外径尺寸由大变小，形成一个拉伸，增强产品强度。
外层通道最大体积V1、内层通道最大体积V2、外层出口处体积v1、内层出口处体积v2、外层熔体运行时间T1、内层熔体运行时间T2、必须满足以下关系：
外层压缩比e1:15≤V1/v1≤22
内层压缩比e2:13≤V2/v2≤20
总体压缩比E:16≤V1+V2/v1+v2≤19
且V2/v2≤V1/v1。
与现有技术相比，有益效果是：本发明结构紧凑，生产操作更为简单；气辅成型，产品内外层结合更加紧密。创新流道结构设计，减少生产烧料，产品发黄、使用开裂问题。可适应同类型PVC管道产品生产，降低生产废品率。
附图说明
图1是本发明整体结构示意图。
具体实施方式
附图仅用于示例性说明，不能理解为对本专利的限制；为了更好说明本实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对于本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。附图中描述位置关系仅用于示例性说明，不能理解为对本专利的限制。
如图1所示，一种降低PVC双壁波纹管废品率机构，其中，包括模座1、设于模座1内的中心分流锥2及双层分流锥3，还包括双支架分流梭4，双支架分流梭4分别连接外层收缩体5、外层模芯6、内层收缩芯7及中心收缩芯8，外层收缩体5与外层模芯6形成的外层熔体运行通道，内层收缩芯7与中心收缩芯8形成的内层熔体运行通道；
还包括外层口模9、内层口模11与内外模芯12，外层口模9与外层模芯6形成的外层定型通道，内层口模11与内外模芯12形成的内层定型通道。
PVC双壁波纹管模具还设有用于调整外层口模9进行位移的调节螺钉14。PVC双壁波纹管模具中部设置有散热装置，通过散热进气孔17引入冷气；散热进气孔17侧部设有真空吸气口16。PVC双壁波纹管模具还包括压板10，通过压板固定螺钉13使压板10固定外层口模9与模座1。PVC双壁波纹管模具还包括外层收缩体固定螺钉15。
本发明中，熔体通过模座1入料口进入模具，并经过中心分流锥2及双层分流锥3的导流作用将熔体由一股料流分成两股料流。
分成两股的熔体，通过双支架分流梭4的引导进入模具中部，双支架分流梭4分别连接外层收缩体5、外层模芯6、内层收缩芯7及中心收缩芯8。外层收缩体5与外层模芯6形成的外层熔体运行通道，通道由宽逐渐变窄，逐步将熔体压缩密实，确保外层熔体内部分子彻底融合；内层收缩芯7与中心收缩芯8形成的内层熔体运行通道，通道由宽逐渐变窄，逐步将熔体压缩密实，确保内层熔体内部分子彻底融合；
经过逐步压缩的内外层的熔体，继续在模体中往前运行，为符合定型冷却的尺寸要求，熔体需进一步的通过口模、模芯成型段进一步的压缩定型，改变熔体的壁厚大小及外形尺寸。其中，外层口模9与外层模芯6形成的外层定型通道，将熔体逐步由厚变薄，外径尺寸由大变小，形成一个拉伸，增强产品强度；内层口模11与内外模芯12形成的内层定型通道，将熔体逐步由厚变薄，外径尺寸由大变小，形成一个拉伸，增强产品强度。
为保证生产时产品壁厚均匀，模具中设置有调节螺钉14，当壁厚出现偏差时，可通过调节螺钉14作用调整外层口模9进行位移，直至尺寸均匀；为确保产品能迅速冷却，模具中部设置有散热装置，通过散热进气孔17引入冷气，通过冷气带走存在于模具内部热量防止中心收缩芯8过热引起烧料；为确保生产时候产品的内外层能紧密的融合一起，模具中设置有真空吸附装置，当内外层熔体通过各自通道到达冷却定型块时，由于定型块吸附的为外层熔体，而内层熔体仅通过模具出口的引导进行贴合，容易造成内层熔体与外层熔体存在间隙，为解决此问题，模具内部增加了真空吸附装置，通过真空吸气口16接入真空泵，由于真空吸气口16直接和外层模芯6、内层收缩芯之间的小通道，当管成型时，通过真空泵吸附，并控制气压在负压值，实现内外层解密贴合。
为减少熔体在模具中发生烧料，产品发黄、使用开裂，模具设计中，外层通道最大体积V1、内层通道最大体积V2、外层出口处体积v1、内层出口处体积v2、外层熔体运行时间T1、内层熔体运行时间T2、必须满足以下关系：
外层压缩比e1:15≤V1/v1≤22
内层压缩比e2:13≤V2/v2≤20
总体压缩比E:16≤V1+V2/v1+v2≤19
且V2/v2≤V1/v1
本发明通过在模具上的创新设计，改善生产效率。模具采用双支架分流结构，实现内外层熔体分流均衡，减少烧料，产品发黄、开裂；内层与外层结合缝隙，采用气辅装置，实现内外层的紧密贴合，从而降低生产废品率，提升生产效率。
显然，本发明的上述实施例仅仅是为清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (7)

1.一种降低PVC双壁波纹管废品率机构，其特征在于，包括模座（1）、设于模座（1）内的中心分流锥（2）及双层分流锥（3），还包括双支架分流梭（4），双支架分流梭（4）分别连接外层收缩体（5）、外层模芯（6）、内层收缩芯（7）及中心收缩芯（8），外层收缩体（5）与外层模芯（6）形成的外层熔体运行通道，内层收缩芯（7）与中心收缩芯（8）形成的内层熔体运行通道；
还包括外层口模（9）、内层口模（11）与内外模芯（12），外层口模（9）与外层模芯（6）形成的外层定型通道，内层口模（11）与内外模芯（12）形成的内层定型通道。
2.根据权利要求1所述的一种降低PVC双壁波纹管废品率机构，其特征在于：PVC双壁波纹管模具还设有用于调整外层口模（9）进行位移的调节螺钉（14）。
3.根据权利要求1所述的一种降低PVC双壁波纹管废品率机构，其特征在于：PVC双壁波纹管模具中部设置有散热装置，通过散热进气孔（17）引入冷气；散热进气孔（17）侧部设有真空吸气口（16）。
4.根据权利要求1所述的一种降低PVC双壁波纹管废品率机构，其特征在于：PVC双壁波纹管模具还包括压板（10），通过压板固定螺钉（13）使压板（10）固定外层口模（9）与模座（1）。
5.根据权利要求1至4任一所述的一种降低PVC双壁波纹管废品率机构，其特征在于：PVC双壁波纹管模具还包括外层收缩体固定螺钉（15）。
6.利用权利要求5所述的降低PVC双壁波纹管废品率机构的方法，其特征在于：包括以下步骤：
S1. 熔体通过模座（1）入料口进入模具，并经过中心分流锥（2）及双层分流锥（3）的导流作用将熔体由一股料流分成两股料流；
S2. 分成两股的熔体，通过双支架分流梭（4）的引导进入模具中部，双支架分流梭（4）分别连接外层收缩体（5）、外层模芯（6）、内层收缩芯（7）及中心收缩芯（8）；外层收缩体（5）与外层模芯（6）形成的外层熔体运行通道，通道由宽逐渐变窄，逐步将熔体压缩密实，确保外层熔体内部分子彻底融合；内层收缩芯（7）与中心收缩芯（8）形成的内层熔体运行通道，通道由宽逐渐变窄，逐步将熔体压缩密实，确保内层熔体内部分子彻底融合；
S3. 经过逐步压缩的内外层的熔体，继续在模体中往前运行，为符合定型冷却的尺寸要求，熔体需进一步的通过口模、模芯成型段进一步的压缩定型，改变熔体的壁厚大小及外形尺寸；其中，外层口模（9）与外层模芯（6）形成的外层定型通道，将熔体逐步由厚变薄，外径尺寸由大变小，形成一个拉伸，增强产品强度；内层口模（11）与内外模芯（12）形成的内层定型通道，将熔体逐步由厚变薄，外径尺寸由大变小，形成一个拉伸，增强产品强度。
7.根据权利要求6所述的降低PVC双壁波纹管废品率的方法，其特征在于：外层通道最大体积V1、内层通道最大体积V2、外层出口处体积v1、内层出口处体积v2、外层熔体运行时间T1、内层熔体运行时间T2、必须满足以下关系：
外层压缩比e1:15≤V1/v1≤22
内层压缩比e2:13≤V2/v2≤20
总体压缩比E:16≤V1+V2/v1+v2≤19
且V2/v2≤V1/v1。
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