CN114131880B - Double-layer co-extrusion die for multi-cavity pipe - Google Patents
Double-layer co-extrusion die for multi-cavity pipe Download PDFInfo
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- CN114131880B CN114131880B CN202111593657.XA CN202111593657A CN114131880B CN 114131880 B CN114131880 B CN 114131880B CN 202111593657 A CN202111593657 A CN 202111593657A CN 114131880 B CN114131880 B CN 114131880B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 47
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 19
- 238000013461 design Methods 0.000 description 3
- 239000002355 dual-layer Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- 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
-
- 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
- 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
- B29C48/695—Flow dividers, e.g. breaker plates
- B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
- B29C48/705—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows in the die zone, e.g. to create flow homogeneity
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of die production, in particular to a double-layer co-extrusion die for multi-cavity tubes. The flow distribution structure comprises a first die body, a second die body and a sleeve sleeved on the outer periphery of the first die body, wherein the first die body is sleeved on the outer periphery of the second die body, at least one first flow channel communicated with the first outlet is arranged on the outer wall of the first die body, at least one second flow channel communicated with the second outlet is arranged on the outer wall of the second die body, the forming structure comprises a third die body arranged at the discharge holes of the first flow channel and the second flow channel and a die sleeved on the outer periphery of the third die body, the third die body is provided with at least two flow guide pieces, and a forming cavity for welding materials flowing out of the discharge holes is formed between the at least two flow guide pieces. The invention solves the problems of long flowing time and uneven wall thickness of the molded multi-cavity pipe when the material fills the gap of the core mold.
Description
Technical Field
The invention relates to the technical field of die production, in particular to a double-layer co-extrusion die for multi-cavity tubes.
Background
The multi-cavity tube is a tube with a plurality of cavities in the same tube, and can have various different shapes and tube cavity shapes. Medical multi-lumen tubing may provide multiple functions for medical instrument and equipment applications, with different lumen channels having multiple uses for guidewire threading, fluid, drug delivery, and the like. Compared with a single-cavity tube, the multi-cavity tube has the characteristics of complex cross-sectional shape, high geometric accuracy and the like. In the existing mould, the traditional multi-cavity core mould is usually filled in the core mould gap after the flow guide section is finished, the core mould can be filled in the material flowing in the mould at the forming end, the material flowing time is long, and the wall thickness of the formed multi-cavity pipe is uneven.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the material in the prior art starts to fill the core mould gap after the end of the flow guide section, so that the flowing time is long and the wall thickness of the formed multi-cavity pipe is uneven, thereby providing a double-layer co-extrusion die for the multi-cavity pipe.
In order to solve the above problems, the present invention provides a double-layer co-extrusion die for multi-cavity tubing, comprising:
the split-flow structure is provided with an inlet, a first outlet and a second outlet;
the circulation structure comprises a first die body, a second die body and a sleeve sleeved on the periphery of the first die body, wherein the first die body is sleeved on the periphery of the second die body, the outer wall of the first die body is provided with at least one first flow passage communicated with the first outlet, and the outer wall of the second die body is provided with at least one second flow passage communicated with the second outlet;
the forming structure comprises a third die body arranged at the discharge hole of the first flow passage and the second flow passage and a mouth die sleeved on the periphery of the third die body, wherein the third die body is provided with at least two flow guiding pieces, and a forming cavity for welding materials flowing out from the discharge hole is formed between the at least two flow guiding pieces.
Optionally, the water conservancy diversion spare includes guiding portion and the shaping portion of connection setting, guiding portion is from the discharge gate extremely guiding portion and shaping portion's junction diameter reduces gradually.
Optionally, an end of the flow guiding portion away from the forming portion extends into the first die body.
Optionally, the flow guiding part and the forming part are integrally formed.
Optionally, the first flow channel and the second flow channel are spiral flow channels, and the spiral flow channels gradually decrease in groove depth from the feeding hole to the discharging hole.
Optionally, the first die body and the second die body are conical tables with diameters gradually reduced from the feeding hole to the discharging hole.
Optionally, the third mold body is a replaceable core mold.
Optionally, the molding structure further comprises a platen that presses the port onto the sleeve.
Optionally, a connector is also included in communication with the inlet of the flow splitting structure.
Optionally, a first flow regulator and a second flow regulator are provided adjacent the first and second outlets of the flow dividing structure, respectively.
The technical scheme of the invention has the following advantages:
1. The invention provides a double-layer co-extrusion die for multi-cavity pipes, which comprises a flow dividing structure, a forming structure and a forming structure, wherein the flow dividing structure is provided with an inlet, a first outlet and a second outlet, the flow dividing structure comprises a first die body, a second die body and a sleeve sleeved on the outer periphery of the first die body, the first die body is sleeved on the outer periphery of the second die body, at least one first flow passage communicated with the first outlet is arranged on the outer wall of the first die body, at least one second flow passage communicated with the second outlet is arranged on the outer wall of the second die body, the forming structure comprises a third die body arranged at the discharge holes of the first flow passage and the second flow passage and a mouth die sleeved on the outer periphery of the third die body, the third die body is provided with at least two flow guiding pieces, and a forming cavity for welding materials flowing out of the discharge holes is formed between the at least two flow guiding pieces. The design of at least one first runner and at least one second runner enables materials to reach the discharge port along the runners fast. The first die body is sleeved on the periphery of the second die body, the third die body is arranged at the outlet of the first runner and the second runner, the flow path of the material in the second runner flowing to the third die body flow guide piece is smaller than the flow path of the material in the first runner flowing to the third die body flow guide piece, so that the material in the second runner reaches the gap between the flow guide pieces before the material in the first runner reaches the position of achieving the cavity along the gap, namely the material in the second runner is formed into the inner area of the multi-cavity tube in the forming cavity, the material in the first runner flows along the outer surface of the flow guide piece, and covers the material surface of the second runner to form the outer area of the multi-cavity tube. Because the materials in the first runner and the second runner are the same material, seamless welding can be realized between the guide pieces, so that the material has better filling capacity from the guide piece entering the third die body, the wall thickness of the multi-cavity tube formed by the forming cavity is more uniform, the accuracy of the section shape is higher, the success rate of one-time test can be improved, and the production cost of enterprises is effectively saved. In addition, the material flows along the outer surface and the gap from entering the guide piece, so that the time for reaching the connecting part between the cavities of the multi-cavity tube is reduced, and the production efficiency is improved.
2. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention has the advantages that the flow guide part comprises the flow guide part and the forming part which are connected, the diameter of the flow guide part is gradually reduced from the discharge hole to the connecting part of the flow guide part and the forming part, and the flow guide part and the forming part are integrally processed. The diversion part and the forming part are integrally processed to reduce the manufacturing and processing cost of the third die body. The guide part plays a role in guiding the material to flow to the forming part, the guide part is directly gradually reduced from the discharge hole to the connection part of the guide part and the forming part, so that the material smoothly reaches the forming part along the outer surface of the guide part, the material forms an inner cavity of the multi-cavity tube along the outer surface of the forming part, and meanwhile, the forming part and the mouth die are matched to form the multi-cavity tube under the extrusion effect.
3. According to the double-layer co-extrusion die for the multi-cavity pipe, one end of the flow guide part, which is far away from the forming part, extends into the first die body, so that materials flowing out of the second flow channel enter the flow guide part of the flow guide piece and gaps between the flow guide parts earlier than materials flowing out of the first flow channel, and the materials flowing out of the first flow channel flow along the flow guide part and are close to the outer surface of the die, so that the materials of the second flow channel can reach the forming cavity of the forming part along the gaps of the flow guide part to form an inner cavity of the multi-cavity pipe, and the materials flowing out of the first flow channel move to the outer surface of the forming part along the outer surface of the flow guide part to form an outer area of the multi-cavity pipe.
4. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention has the advantages that the first flow channel and the second flow channel are both spiral flow channels, and the groove depth of each spiral flow channel gradually decreases from the feed inlet to the discharge outlet. The spiral flow channel design, the material is split into uniform rings, and the temperature and the speed are relatively uniform in the flowing direction. The groove depth is gradually reduced, so that the material can only flow along the axial direction of the die body when approaching to the third die body, but can not remain in the spiral flow channel, the material is fully utilized, and the waste of the material in the forming process is reduced.
5. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention has the advantages that the first die body and the second die body are conical tables with diameters gradually reduced from the feed inlet to the discharge outlet. The second die body is a frustum with the diameter gradually reduced from the feed inlet to the discharge outlet so as to gradually increase the gap between the inner surface of the first die body and the outer surface of the second die body, and the first die body is a frustum with the diameter gradually reduced from the feed inlet to the discharge outlet so as to gradually increase the gap between the inner surface of the sleeve and the outer surface of the first die body. The gradually-increased gap fully accommodates redundant materials due to the gradually-reduced groove depth of the spiral flow channel, so that the materials can only flow along the axial direction of the die body, and the flow efficiency of the materials is improved by being closely matched with the spiral flow channel.
6. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention has the advantages that the third die body is a replaceable core die, the core die can be replaced to manufacture multi-cavity pipes with different sections, and the possibility is provided for extrusion molding of the multi-cavity pipes by the same die head die.
7. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention has the advantages that the forming structure further comprises the pressing plate for pressing the die on the sleeve, the pressing plate is used for pressing the die on the sleeve to realize the sealing between the die and the sleeve, and the material is prevented from flowing out of a gap between the die and the sleeve.
8. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention further comprises a connector communicated with the inlet of the flow distribution structure, and the connector is used for conveying materials to the inlet of the flow distribution structure so as to facilitate subsequent flow distribution.
9. The double-layer co-extrusion die for the multi-cavity pipe provided by the invention is characterized in that the first outlet and the second outlet close to the split-flow structure are respectively provided with the first flow regulator and the second flow regulator, the first flow regulator is used for regulating the flow in the spiral channel of the first die body, the second flow regulator is used for regulating the flow in the spiral channel of the second die body, and the flow entering the first spiral channel and the second spiral channel can be conveniently regulated by staff according to the wall thickness and the section shape of the multi-cavity pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded view of a dual layer co-extrusion die for a multi-lumen tubing provided in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a flow-through structure of a double-layer co-extrusion die for multi-lumen tubing provided in an embodiment of the present invention;
FIG. 3 is a schematic structural view of a second die body of a dual-layer co-extrusion die for multi-lumen tubing provided in an embodiment of the present invention;
FIG. 4 is a schematic structural view of a third die body of a double-layer co-extrusion die for multi-lumen tubing provided in an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a multi-lumen tube formed by a dual-layer co-extrusion die of a multi-lumen tube provided in an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a multi-lumen tube formed by a double-layer co-extrusion die of a multi-lumen tube provided in an embodiment of the present invention.
The reference numerals are 1, a connector, 2, a flow dividing structure, 3, a first flow regulator, 4, a first die body, 5, a second die body, 6, a sleeve, 7, a third die body, 8, a die, 9, a pressing plate, 10, a flow guiding piece, 11, a flow guiding part, 12, a forming part, 13, a first flow passage, 14, a second flow passage, 15, a gap, 16 and a forming cavity.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
One embodiment of a double-layer co-extrusion die for multi-cavity pipes as shown in fig. 1-6 comprises a connector 1, a flow dividing structure 2, a flow passing structure and a forming structure which are sequentially communicated along the material flow direction.
As shown in fig. 1 and 2, the flow dividing structure 2 is provided with an inlet, a first outlet and a second outlet, the inlet of the flow dividing structure 2 is connected with a connector 1 through bolts, and the first outlet and the second outlet are respectively provided with a first flow regulator 3 and a second flow regulator.
As shown in fig. 1 and 2, the circulation structure comprises a second die body 5, a first die body 4 and a sleeve 6 which are sleeved in sequence from inside to outside, wherein two first flow passages 13 communicated with a first outlet are arranged on the outer wall of the first die body 4, and a second flow passage 14 communicated with a second outlet is arranged on the outer wall of the second die body 5. The first die body 4 and the second die body 5 are frustum with gradually reduced diameters from the feed inlet to the discharge outlet, and the first die body 4 and the second die body 5 are fixedly connected with the sleeve 6 through bolts. The first flow channel 13 and the second flow channel 14 are spiral flow channels, and the groove depth of the spiral flow channels from the feed inlet to the discharge outlet is gradually reduced.
As shown in fig. 1,2 and 4, in order to realize the molding of materials, the device further comprises a third die body 7 and a die 8 sleeved on the periphery of the third die body 7, wherein the third die body 7 is arranged at the discharge ports of the first flow channel 13 and the second flow channel 14, three flow guide pieces 10 are arranged on the third die body 7, and gaps 15 are arranged between the adjacent flow guide pieces 10. As shown in fig. 4, the flow guiding member 10 is divided into a flow guiding portion 11 and a forming portion 12 which are connected, and a forming cavity 16 is formed between two adjacent forming portions 12, wherein the flow guiding portion 11 is formed integrally from a discharge hole to a frustum with a gradually reduced diameter at the connection position of the flow guiding portion 11 and the forming portion 12. As shown in fig. 2, an end of the guide portion 11 remote from the forming portion 12 extends in the first mold body. To form multi-lumen tubing of different shapes, the third die body 7 is a replaceable mandrel. To fix the die 8, a pressing plate 9 is further included, and the pressing plate 9 presses the die 8 onto the sleeve 6 through bolts.
In the concrete molding process, the machine head die is connected with the extruder through the connector 1, materials reach the inlet of the flow distribution structure 2 through the connector 1 under the pressure effect, and the staff adjusts the flow of the first flow regulator 3 at the first outlet and the second flow regulator at the second outlet according to the concrete structure of the multi-cavity pipe. The material respectively reaches the first runner 13 and the second runner 14 through the first outlet and the second outlet, uniform temperature and speed distribution exists in the spiral runner in the flowing direction, one part of the material reaches the guide part 11 and the gap 15 through the second runner 14 to flow along the outer surface of the guide part 11 and the gap 15, the other part of the material reaches the guide part 11 through the first runner 13, the materials in the first runner 13 and the second runner 14 are welded at the guide part 11, the material at the gap 15 of the guide part 11 flows to the forming cavity 16 of the forming part 12 to form an inner cavity of the multi-cavity tube, and the material at the outer surface of the guide part 11 flows to the inner surface of the die 8 to form the outer wall of the multi-cavity tube. In addition, the skilled person can choose a third mould body 7 of different shape depending on the cross-sectional area of the multilumen tubing to be formed.
The double-layer co-extrusion die for the multi-cavity pipe provided by the invention can adjust the flow of the first outlet and the second outlet under the condition of not increasing the number of extruders so as to realize a double-layer co-extrusion technology, can enable technicians to adjust the flow according to the section shape of the multi-cavity pipe to form the multi-cavity pipe, can enable materials to move towards the inner cavity of the multi-cavity pipe at the flow guide part 11 of the flow guide part 10, ensures the uniformity of the thickness of the multi-cavity pipe wall and the precision of the section shape, and simultaneously can replace a core die design to provide possibility for producing multi-cavity pipes with different sections for the same machine head die.
As an alternative embodiment, the number of flow guides 10 on the third mould body 7 may also be two, four or even more.
Alternatively, the number of first flow channels 13 and second flow channels 14 may be one, three or even more.
Alternatively, the molding portion 12 may have another shape such as an oval shape.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111593657.XA CN114131880B (en) | 2021-12-23 | 2021-12-23 | Double-layer co-extrusion die for multi-cavity pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111593657.XA CN114131880B (en) | 2021-12-23 | 2021-12-23 | Double-layer co-extrusion die for multi-cavity pipe |
Publications (2)
| Publication Number | Publication Date |
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| CN114131880A CN114131880A (en) | 2022-03-04 |
| CN114131880B true CN114131880B (en) | 2024-11-29 |
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| CN202111593657.XA Active CN114131880B (en) | 2021-12-23 | 2021-12-23 | Double-layer co-extrusion die for multi-cavity pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN216683249U (en) * | 2021-12-23 | 2022-06-07 | 赛诺神畅医疗科技有限公司 | Double-layer co-extrusion die for multi-cavity pipe |
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| WO2016041512A1 (en) * | 2014-09-17 | 2016-03-24 | 北新集团建材股份有限公司 | Extrusion mold and manufacturing method for composite plate material formed by coextrusion |
| CN206242461U (en) * | 2016-11-03 | 2017-06-13 | 浙江双林机械股份有限公司 | A kind of two layers of coextru-lamination pipe mold |
| CN107053634A (en) * | 2016-12-31 | 2017-08-18 | 山东国塑科技实业有限公司 | Tube extrusion rotation sieve die head |
| CN207432732U (en) * | 2017-11-17 | 2018-06-01 | 深圳市恒大伟业塑胶有限公司 | A kind of multi-layer co-extruded composite precision die |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN216683249U (en) * | 2021-12-23 | 2022-06-07 | 赛诺神畅医疗科技有限公司 | Double-layer co-extrusion die for multi-cavity pipe |
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| CN114131880A (en) | 2022-03-04 |
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