CN106514986A - Double-layer combined PP-R pipe die - Google Patents
Double-layer combined PP-R pipe die Download PDFInfo
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- CN106514986A CN106514986A CN201610699285.1A CN201610699285A CN106514986A CN 106514986 A CN106514986 A CN 106514986A CN 201610699285 A CN201610699285 A CN 201610699285A CN 106514986 A CN106514986 A CN 106514986A
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- 229920001155 polypropylene Polymers 0.000 title claims abstract description 30
- 239000000155 melt Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 238000007723 die pressing method Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 83
- 239000000463 material Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- B29C48/30—Extrusion nozzles or dies
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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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
- B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
本发明涉及提供一种双层复合PP‑R管材模具，包括模具连接段、模座、外模体以及成型部，所述模座的一端设置模具连接段，所述模座的另一端与所述外模体连接，所述外模体末端与所述成型部连接，所述外模体通过设在其内的双层熔体流道与成型部连接，原材料通过所述模具连接段进入模具内融化后沿所述双层熔体流道进入所述成型部挤出成PP‑R管坯。本发明的设计将采用双层熔体流道结构，内层熔体流道模具控制内层挤出量，外层熔体流道模具控制外层挤出量，而后在内层熔体流道与所述外层熔体流道内的熔体在所述外模体及所述收缩套形成的流体通道内汇合，汇合后的熔体经流道通向模具成型部，经过模具成型部挤出成型，到达模具可满足PP‑R双层共挤生产的目的。
The present invention relates to providing a double-layer composite PP-R pipe mold, comprising a mold connecting section, a mold base, an outer mold body and a forming part, one end of the mold base is provided with a mold connecting section, and the other end of the mold base is connected to the mold base. The outer mold body is connected, the end of the outer mold body is connected to the molding part, the outer mold body is connected to the molding part through the double-layer melt flow channel provided inside, and the raw material enters the mold through the mold connecting section After internal melting, enter the forming part along the double-layer melt channel and extrude into PP-R tube blank. The design of the present invention will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the inner layer extrusion amount, the outer layer melt flow channel mold controls the outer layer extrusion amount, and then the inner layer melt flow channel Merge with the melt in the outer melt flow channel in the fluid channel formed by the outer mold body and the shrink sleeve, the merged melt leads to the mold forming part through the flow channel, and is extruded through the mold forming part Forming and reaching the mold can meet the purpose of PP‑R double-layer co-extrusion production.
Description
技术领域technical field
本发明涉及模具技术领域，具体涉及塑料管道生产所需的一种双层复合PP-R管材模具。The invention relates to the technical field of molds, in particular to a double-layer composite PP-R pipe mold required for the production of plastic pipes.
背景技术Background technique
PP-R管又叫三型聚丙烯管，采用无规共聚聚丙烯经挤出成为管材，注塑成为管件。是欧洲90年代初开发应用的新型塑料管道产品。PP-R是80年代末，采用气相共聚工艺使5%左右PE在PP的分子链中随机地均匀聚合而成为新一代管道材料。它具有较好的抗冲击性能和长期蠕变性能。目前市场上PP-R管材多数为单层结构，且生产该PP-R管材的模具以单层挤出为主，不能满足双层共挤产品PP-R管材的生产。PP-R pipe is also called three-type polypropylene pipe, which is made of random copolymerized polypropylene, which is extruded into pipes and injection molded into pipe fittings. It is a new type of plastic pipe product developed and applied in Europe in the early 1990s. In the late 1980s, PP-R adopted the gas phase copolymerization process to randomly and uniformly polymerize about 5% of PE in the molecular chain of PP to become a new generation of pipeline materials. It has good impact resistance and long-term creep performance. At present, most PP-R pipes on the market have a single-layer structure, and the molds for producing the PP-R pipes are mainly single-layer extrusion, which cannot meet the production of double-layer co-extruded PP-R pipes.
发明内容Contents of the invention
本发明为克服上述现有技术所述的至少一种缺陷，提供一种双层复合PP-R管材模具，包括模具连接段、模座、外模体以及成型部，所述模座的一端设置模具连接段，所述模座的另一端与所述外模体连接，所述外模体末端与所述成型部连接，所述外模体通过设在其内的双层熔体流道与成型部连接，原材料通过所述模具连接段进入模具内融化后沿所述双层熔体流道进入所述成型部挤出成PP-R管坯。本发明的设计将采用双层熔体流道结构，内层熔体流道模具控制内层挤出量，外层熔体流道模具控制外层挤出量，而后在内层熔体流道与所述外层熔体流道内的熔体在所述外模体及所述收缩套形成的流体通道内汇合，汇合后的熔体经流道通向模具成型部，经过模具成型部挤出成型，到达模具可满足PP-R双层共挤生产的目的。In order to overcome at least one defect described in the above-mentioned prior art, the present invention provides a double-layer composite PP-R pipe mold, including a mold connecting section, a mold base, an outer mold body and a forming part, and one end of the mold base is provided with Mold connection section, the other end of the mold base is connected to the outer mold body, the end of the outer mold body is connected to the molding part, and the outer mold body is connected to the outer mold body through the double-layer melt flow channel arranged inside The forming part is connected, and the raw material enters the mold through the connecting section of the mold to melt, and then enters the forming part along the double-layer melt channel to be extruded into a PP-R tube blank. The design of the present invention will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the inner layer extrusion amount, the outer layer melt flow channel mold controls the outer layer extrusion amount, and then the inner layer melt flow channel Merge with the melt in the outer melt flow channel in the fluid channel formed by the outer mold body and the shrink sleeve, the merged melt leads to the mold forming part through the flow channel, and is extruded through the mold forming part Forming and reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.
作为优选，所述双层熔体流道包括外层熔体流道、内层熔体流道、外模体以及收缩套，所述内层熔体流道包括设置在所述模具连接段上的模具连接段入料口、内层螺旋体底部分流流道以及外层螺旋体，所述模具连接段入料口通过所述模座与所述内层螺旋体底部分流流道构成一个通道，且该通道还与所述外层螺旋体上设置的螺旋槽及所述外模体形成的通道接通；所述外层熔体流道包括设在所外模体上端的外层入料口与内层螺旋体，所述外层入料口与所述内层螺旋体接通；所述内层熔体流道与所述外层熔体流道在所述外模体及所述收缩套形成的流体通道汇合，汇合后的流道与所述成型部连接。原材料由模具连接段入料口并经过模座，进入模具内层螺旋体底部分流流道，经过内层螺旋体流道将原材料熔体分流，然后沿着外层螺旋体的螺旋槽及外模体形成的通道进行轴向螺旋运动，实现将原材料的熔体初步融合塑化作用；同时原材料也通过外层入料口进入内层螺旋体，通过多重环形槽将单向推力逐步平衡，使得原材料的熔体出料达到均衡状态，从内层熔体流道与外层熔体流道融化后的熔体在所述外模体及所述收缩套形成的流体通道汇合，汇合后的流道与所述成型部连接。Preferably, the double-layer melt flow channel includes an outer layer melt flow channel, an inner layer melt flow channel, an outer mold body and a shrink sleeve, and the inner layer melt flow channel includes The feed port of the mold connection section, the branch flow channel at the bottom of the inner spiral body and the outer spiral body, the feed port of the mold connection section forms a channel through the mold base and the branch flow channel at the bottom of the inner spiral body, and the channel It is also connected with the spiral groove provided on the outer helix and the channel formed by the outer mold body; the outer melt flow channel includes an outer material inlet and an inner helix arranged on the upper end of the outer mold body , the outer layer feed port is connected with the inner layer spiral body; the inner layer melt channel and the outer layer melt channel merge in the fluid channel formed by the outer mold body and the shrink sleeve , the merged flow channel is connected with the forming part. The raw material enters the flow channel at the bottom of the inner spiral body from the feed port of the mold connection section and passes through the mold base, and the raw material melt is divided through the inner spiral body flow channel, and then flows along the spiral groove of the outer layer spiral body and the outer mold body. The channel carries out axial spiral movement to realize the initial fusion and plasticization of the raw material melt; at the same time, the raw material also enters the inner spiral body through the outer layer inlet, and the one-way thrust is gradually balanced through multiple annular grooves, so that the raw material melt goes out. The material reaches an equilibrium state, and the melt melted from the inner layer melt flow channel and the outer layer melt flow channel merges in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged flow channel and the forming department connection.
作为优选，所述成型部包括口模及模芯，所述模芯固定装置在所述口模内，且所述模芯与所述口模构成的通道与所述内层熔体流道与所述外层熔体流道汇合后的流道进行连接。从内层熔体流道与外层熔体流道融化后的熔体经过内外层融合塑化，到达模具成型部分，成型部分通道由大变小，该通道呈锥形结构，这样的结构能够将混合后的熔体层进一步压缩密实，并通过口模及模芯直段并挤出成管坯形成PP-R管材。Preferably, the forming part includes a die and a core, the core fixing device is inside the die, and the channel formed by the core and the die is connected to the inner layer melt channel and The merged flow channels of the outer melt flow channels are connected. The melt melted from the inner layer melt flow channel and the outer layer melt flow channel is fused and plasticized by the inner layer and the inner layer, and reaches the molding part of the mold. The channel of the forming part changes from large to small, and the channel is in a tapered structure. Such a structure can The mixed melt layer is further compressed and compacted, and passed through the die and the straight section of the core and extruded into a tube blank to form a PP-R pipe.
作为优选，所述内层螺旋体底部分流流道螺旋均分为六股通道。这样的设计是将原材料的熔体由一股料流螺旋均分成六股来减少模具连接段处熔体流入的推力，有助于模具的顺利运行。As a preference, the helix of the branch flow channel at the bottom of the inner helix is divided into six channels. This design is to divide the melt of the raw material into six strands by one flow spiral to reduce the thrust of the melt inflow at the connecting section of the mold, which is conducive to the smooth operation of the mold.
作为优选，所述内层螺旋体采用环形设计。由于外层熔体流道使用单边入料，即由外层入料口入料，内层螺旋体模具受压不均，故将内层螺旋体采用环形设计，通过多重环形槽将单向推力逐步平衡，使得熔体出料达到均衡状态，保证模具的顺利运行。Preferably, the inner spiral adopts a ring design. Since the outer layer melt channel adopts unilateral feeding, that is, the material is fed from the outer layer inlet, and the inner layer helix mold is under uneven pressure, so the inner layer helix adopts a ring design, and the one-way thrust is gradually increased through multiple ring grooves. Balance, so that the melt discharge reaches a balanced state, to ensure the smooth operation of the mold.
作为优选，在所述口模外还设有口模压板。为了让模具成型部工作顺畅，在口模周围外还设有口模压板，保证了成型部在承受一定压力的情况下的正常工作。Preferably, a die pressing plate is provided outside the die. In order to make the mold forming part work smoothly, there is also a die pressing plate around the die to ensure the normal work of the forming part under certain pressure.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
本发明的设计将采用双层熔体流道结构，内层熔体流道模具控制内层挤出量，外层熔体流道模具控制外层挤出量，而后在内层熔体流道与所述外层熔体流道内的熔体在所述外模体及所述收缩套形成的流体通道内汇合，汇合后的熔体经流道通向模具成型部，经过模具成型部挤出成型，到达模具可满足PP-R双层共挤生产的目的。The design of the present invention will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the inner layer extrusion amount, the outer layer melt flow channel mold controls the outer layer extrusion amount, and then the inner layer melt flow channel Merge with the melt in the outer melt flow channel in the fluid channel formed by the outer mold body and the shrink sleeve, the merged melt leads to the mold forming part through the flow channel, and is extruded through the mold forming part Forming and reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.
附图说明Description of drawings
图1为本发明的结构示意图；Fig. 1 is a structural representation of the present invention;
图2为本发明的内层螺旋体底部分流流道结构示意图；Fig. 2 is a schematic diagram of the structure of the shunt channel at the bottom of the inner spiral body of the present invention;
图3为PP-R管材截面示意图。Figure 3 is a schematic cross-sectional view of a PP-R pipe.
具体实施方式detailed description
下面结合具体实施方式对本发明作进一步的说明。其中，附图仅用于示例性说明，表示的仅是示意图，而非实物图，不能理解为对本专利的限制；为了更好地说明本发明的实施例，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。The present invention will be further described below in combination with specific embodiments. Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.
本发明实施例的附图中相同或相似的标号对应相同或相似的部件；在本发明的描述中，需要理解的是，若有术语“上”、“下”、“左”、“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此附图中描述位置关系的用语仅用于示例性说明，不能理解为对本专利的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific Orientation structure and operation, therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes, and should not be construed as limitations on this patent. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.
实施例Example
如图1至图3所示，本发明最佳实施例的一种双层复合PP-R管材模具，包括模具连接段1、模座2、外模体4以及成型部，所述模座2的一端设置模具连接段1，所述模座2的另一端与所述外模体4连接，所述外模体4的末端与所述成型部连接，所述外模体4通过设在其内的双层熔体流道与成型部连接，原材料通过所述模具连接段1进入模具内融化后沿所述双层熔体流道进入所述成型部挤出成PP-R管坯。本发明的设计将采用双层熔体流道结构，内层熔体流道模具控制内层挤出量，外层熔体流道模具控制外层挤出量，而后在内层熔体流道与所述外层熔体流道内的熔体在所述外模体及所述收缩套形成的流体通道内汇合，汇合后的熔体经流道通向模具成型部，经过模具成型部挤出成型，到达模具可满足PP-R双层共挤生产的目的。As shown in Figures 1 to 3, a double-layer composite PP-R pipe mold of the best embodiment of the present invention includes a mold connecting section 1, a mold base 2, an outer mold body 4 and a forming part, and the mold base 2 One end of the mold base 2 is provided with a mold connection section 1, the other end of the mold base 2 is connected with the outer mold body 4, and the end of the outer mold body 4 is connected with the molding part, and the outer mold body 4 is connected to the outer mold body 4 by The inner double-layer melt flow channel is connected with the forming part, and the raw material enters the mold through the mold connection section 1 to melt, and then enters the forming part along the double-layer melt flow channel to be extruded into a PP-R tube blank. The design of the present invention will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the inner layer extrusion amount, the outer layer melt flow channel mold controls the outer layer extrusion amount, and then the inner layer melt flow channel Merge with the melt in the outer melt flow channel in the fluid channel formed by the outer mold body and the shrink sleeve, the merged melt leads to the mold forming part through the flow channel, and is extruded through the mold forming part Forming and reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.
作为优选，所述双层熔体流道包括外层熔体流道、内层熔体流道、外模体4以及收缩套6，所述内层熔体流道包括设置在所述模具连接段2上的模具连接段入料口、内层螺旋体5底部分流流道以及外层螺旋体3，所述模具连接段1入料口通过所述模座2与所述内层螺旋体5底部分流流道构成一个通道，且该通道还与所述外层螺旋体3上设置的螺旋槽及所述外模体4形成的通道接通；所述外层熔体流道包括设在所外模体4上端的外层入料口10与内层螺旋体5，所述外层入料口10与所述内层螺旋体5接通；所述内层熔体流道与所述外层熔体流道在所述外模体4及所述收缩套6形成的流体通道汇合，汇合后的流道与所述成型部连接。原材料由模具连接段入料口并经过模座，进入模具内层螺旋体底部分流流道，经过内层螺旋体流道将原材料熔体分流，然后沿着外层螺旋体的螺旋槽及外模体形成的通道进行轴向螺旋运动，实现将原材料的熔体初步融合塑化作用；同时原材料也通过外层入料口进入内层螺旋体，通过多重环形槽将单向推力逐步平衡，使得原材料的熔体出料达到均衡状态，从内层熔体流道与外层熔体流道融化后的熔体在所述外模体及所述收缩套形成的流体通道汇合，汇合后的流道与所述成型部连接。Preferably, the double-layer melt flow channel includes an outer layer melt flow channel, an inner layer melt flow channel, an outer mold body 4 and a shrink sleeve 6, and the inner layer melt flow channel includes The feed inlet of the mold connection section on the section 2, the shunt channel at the bottom of the inner spiral body 5 and the outer spiral body 3, the feed inlet of the mold connection section 1 passes through the mold base 2 and the shunt flow at the bottom of the inner spiral body 5 The passage constitutes a channel, and this channel is also connected with the channel formed by the spiral groove provided on the outer spiral body 3 and the outer mold body 4; The outer layer feed port 10 at the upper end is connected with the inner layer spiral body 5, and the outer layer feed port 10 is connected with the inner layer spiral body 5; the inner layer melt flow channel and the outer layer melt flow channel are connected The fluid channel formed by the outer mold body 4 and the shrink sleeve 6 merges, and the merged flow channel is connected with the molding part. The raw material enters the flow channel at the bottom of the inner spiral body from the feed port of the mold connection section and passes through the mold base, and the raw material melt is divided through the inner spiral body flow channel, and then flows along the spiral groove of the outer layer spiral body and the outer mold body. The channel carries out axial spiral movement to realize the initial fusion and plasticization of the raw material melt; at the same time, the raw material also enters the inner spiral body through the outer layer inlet, and the one-way thrust is gradually balanced through multiple annular grooves, so that the raw material melt goes out. The material reaches an equilibrium state, and the melt melted from the inner layer melt flow channel and the outer layer melt flow channel merges in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged flow channel and the forming department connection.
作为优选，所述成型部包括口模9及模芯8，所述模芯8固定装置在所述口模9内，且所述模芯8与所述口模9构成的通道与所述内层熔体流道与所述外层熔体流道汇合后的流道进行连接。从内层熔体流道与外层熔体流道融化后的熔体经过内外层融合塑化，到达模具成型部分，成型部分通道由大变小，该通道呈锥形结构，这样的结构能够将混合后的熔体层进一步压缩密实，并通过口模及模芯直段并挤出成管坯形成PP-R管材。As preferably, the molding part includes a die 9 and a core 8, the core 8 is fixed in the die 9, and the channel formed by the core 8 and the die 9 is connected to the inner core 8. The melt flow channel of the first layer is connected with the flow channel after the fusion of the melt flow channel of the outer layer. The melt melted from the inner layer melt flow channel and the outer layer melt flow channel is fused and plasticized by the inner layer and the inner layer, and reaches the molding part of the mold. The channel of the forming part changes from large to small, and the channel is in a tapered structure. Such a structure can The mixed melt layer is further compressed and compacted, and passed through the die and the straight section of the core and extruded into a tube blank to form a PP-R pipe.
作为优选，所述内层螺旋体5底部分流流道螺旋均分为六股通道。这样的设计是将原材料的熔体由一股料流螺旋均分成六股来减少模具连接段处熔体流入的推力，有助于模具的顺利运行。As a preference, the branch flow channel at the bottom of the inner spiral body 5 is helically divided into six channels. This design is to divide the melt of the raw material into six strands by one flow spiral to reduce the thrust of the melt inflow at the connecting section of the mold, which is conducive to the smooth operation of the mold.
作为优选，所述内层螺旋体5采用环形设计。由于外层熔体流道使用单边入料，即由外层入料口入料，内层螺旋体模具受压不均，故将内层螺旋体采用环形设计，通过多重环形槽将单向推力逐步平衡，使得熔体出料达到均衡状态，保证模具的顺利运行。Preferably, the inner spiral body 5 adopts a ring design. Since the outer layer melt channel adopts unilateral feeding, that is, the material is fed from the outer layer inlet, and the inner layer helix mold is under uneven pressure, so the inner layer helix adopts a ring design, and the one-way thrust is gradually increased through multiple ring grooves. Balance, so that the melt discharge reaches a balanced state, to ensure the smooth operation of the mold.
作为优选，在所述口模9外还设有口模压板7。为了让模具成型部工作顺畅，在口模周围外还设有口模压板，保证了成型部在承受一定压力的情况下的正常工作。Preferably, a die pressing plate 7 is provided outside the die 9 . In order to make the mold forming part work smoothly, there is also a die pressing plate around the die to ensure the normal work of the forming part under certain pressure.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
本发明的设计将采用双层熔体流道结构，内层熔体流道模具控制内层挤出量，外层熔体流道模具控制外层挤出量，而后在内层熔体流道与所述外层熔体流道内的熔体在所述外模体及所述收缩套形成的流体通道内汇合，汇合后的熔体经流道通向模具成型部，经过模具成型部挤出成型，到达模具可满足PP-R双层共挤生产的目的。The design of the present invention will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the inner layer extrusion amount, the outer layer melt flow channel mold controls the outer layer extrusion amount, and then the inner layer melt flow channel Merge with the melt in the outer melt flow channel in the fluid channel formed by the outer mold body and the shrink sleeve, the merged melt leads to the mold forming part through the flow channel, and is extruded through the mold forming part Forming and reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.
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。Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.
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| CN110948822A (en) * | 2019-11-15 | 2020-04-03 | 广东威立瑞科技有限公司 | HDPE pipe mould |
| CN114379053A (en) * | 2021-12-31 | 2022-04-22 | 漳州杰安塑料有限公司 | PLA straw forming die |
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