CN107553857B - Gas-assisted micro-co-extrusion forming device for polymer processing - Google Patents
Gas-assisted micro-co-extrusion forming device for polymer processing Download PDFInfo
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- CN107553857B CN107553857B CN201710982086.6A CN201710982086A CN107553857B CN 107553857 B CN107553857 B CN 107553857B CN 201710982086 A CN201710982086 A CN 201710982086A CN 107553857 B CN107553857 B CN 107553857B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 75
- 238000010094 polymer processing Methods 0.000 title claims abstract description 13
- 239000010410 layer Substances 0.000 claims abstract description 59
- 239000012792 core layer Substances 0.000 claims abstract description 47
- 239000000155 melt Substances 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 7
- 238000005253 cladding Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 241000124033 Salix Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000010340 shenyuan Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The gas-assisted micro-coextrusion forming device for polymer processing comprises a hollow mouth mold core layer serving as a core layer melt flow channel, wherein a mouth mold shell layer is a shell layer melt flow channel, and the mouth mold core layer and the lower end of the mouth mold core layer form a shell layer melt storage area; the co-extrusion transition section is arranged below the mouth mold shell layer; the air chamber cavity and the bottom plate form an air chamber together, so that the air can stably flow into the air-assisted micro co-extrusion flow channel; the middle of the bottom plate is provided with a gas-assisted micro-co-extrusion flow channel, the diameter of the gas-assisted micro-co-extrusion flow channel is slightly larger than the outer diameter of the shell layer of the bar, and the co-extrusion transition section and the air chamber form a gas-assisted co-extrusion section; meanwhile, a die air inlet gap is reserved on the upper surface of the bottom plate and the lower surface of the co-extrusion transition section, so that a stable air cushion film layer is formed between the surface of the melt and the wall surface of the die, and the flow of the melt in the gas-assisted micro-co-extrusion runner is converted from non-slipping adhesive shear flow to fully slipping non-adhesive shear flow, thereby effectively improving the defects caused by melt stress, shear rate or flow imbalance.
Description
Technical Field
The invention relates to the technical field of polymer processing auxiliary devices, in particular to a gas auxiliary micro-co-extrusion forming device for polymer processing.
Background
Round bar gas-assisted single extrusion outlet dies designed by a gap gas inlet method are disclosed for The first time in Liang in 2001 (R.F. Liang, M.R. Mackley, the gas-assisted extrusion of molten polyethylene [ J ] Journal of Rheology, 2001, 45 (1): 211-226), round bar gas-assisted single extrusion outlet dies (Huang Xingyuan, willow and raw, zhou Guofa, luo Zhongmin, li Shenyuan) designed by improved design on The basis of The gas-assisted outlet dies designed by Liang in 2005, rectangular section laminated gas-assisted co-extrusion outlet dies of The gap gas inlet method are designed in The experimental study [ J ]. Chinese plastics, 2005, 19 (3): 17-19), huang Yibin in 2013, and The like, and optimization of technological parameters and die design criteria (Huang Yibin, willow and raw, huang Xingyuan, xiong Aihua) of gas-assisted co-extrusion rectangular section PP double-layer profiles are proposed in The experimental study [ J ]. Plastics industry, 2013, 41 (4): 49-52).
However, the existing gas-assisted extrusion dies are all aimed at extruding polymer products with the diameter of more than 10mm, and the gas-assisted extrusion dies aimed at extruding polymer micro-products with the diameter of less than 2mm are not yet seen, and along with the vigorous development of micro/nano science technology, products gradually develop towards the directions of miniaturization, microminiaturization and precision, and the micro/nano manufacturing technology with polymer as a base material is a current research hotspot and is one of the important development directions in China.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a gas-assisted micro-co-extrusion device for polymer processing, which is used for solving the defects in the prior art.
The technical problems solved by the invention are realized by adopting the following technical scheme:
the gas-assisted micro-coextrusion forming device for polymer processing comprises a die feeding section, a coextrusion transition section and a gas-assisted coextrusion section, wherein a die core layer and a die shell layer are formed, an inner cavity of the die core layer is a core layer melt flow channel which is of a hollow structure, the upper end of the inner cavity of the die core layer serving as a core layer melt inlet is of a conical structure, the lower end of the inner cavity of the die core layer is of a round structure, the size of the round structure is equal to the diameter of a bar core layer, the inner cavity of a die shell layer is a shell layer melt flow channel, a shell layer melt storage area is formed by the die shell layer and the lower end of the die core layer, and a shell layer melt inlet is formed on one side of the shell layer melt storage area; the co-extrusion transition section serving as a flow channel before the two layers of polymer melt are converged and enter the gas-assisted co-extrusion section is arranged below the die shell layer, so that the two layers of polymer melt flowing through the die core layer inner cavity and the die shell inner cavity are converged into a whole; the air chamber cavity and the bottom plate form an air chamber together and are used for storing the air conveyed by the high-pressure air tank, so that the air flow and the air pressure are stabilized, and the air can stably flow into the air-assisted micro co-extrusion flow channel; the middle of the bottom plate is provided with a gas-assisted micro-co-extrusion flow channel which is used for a flow channel after two layers of polymer melt are converged, the diameter of the gas-assisted micro-co-extrusion flow channel is larger than the outer diameter of a bar shell, and a gas-assisted co-extrusion section is formed by a co-extrusion transition section and an air chamber and is used for extruding the melt; and a die air inlet gap serving as an air inlet of the air chamber for air entering the air-assisted micro-co-extrusion runner is reserved on the upper surface of the bottom plate and the lower surface of the co-extrusion transition section so as to form an air cushion film layer between the surface of the melt and the wall surface of the die.
In the present invention, the die is cylindrical.
In the invention, a sealing ring is arranged at the contact part of the air chamber cavity and the bottom plate.
In the invention, the inner cavity of the shell layer of the die is a cylindrical cavity.
In the invention, the diameter of the gas-assisted micro-coextrusion runner is 0.2mm larger than the outer diameter of the bar shell.
In the invention, the air inlet gap of the die is 0.1 mm-0.2 mm.
In the present invention, the thickness of the air cushion film layer is 0.1mm.
In the invention, a core layer melt and a shell layer melt respectively flow into a mold from a core layer melt inlet and a shell layer melt inlet, the core layer melt enters a core layer melt flow channel after flowing through a conical convergence section, the shell layer melt enters a shell layer melt storage area after flowing into the mold, then enters a co-extrusion transition section and is converged with the core layer melt, gas enters a gas-assisted micro-co-extrusion runner from a gas chamber at the junction of the core layer melt and the shell layer melt through a gas inlet gap of the opening mold, and finally the melt is extruded along with the gas by a gas-assisted co-extrusion section, so that the bar cladding composite product with the required appearance and size is obtained.
The beneficial effects are that: the invention applies the gas auxiliary technology to polymer micro-co-extrusion molding, and gas in a gas chamber enters a gas auxiliary micro-co-extrusion runner at low speed to form a stable air cushion film layer between the surface of a melt and the wall surface of a die, so that the flow of the melt in the gas auxiliary micro-co-extrusion runner is converted from non-slipping adhesive shear flow to fully slipping non-adhesive shear flow, thereby fully reducing the stress and the shear rate of the melt in a gas auxiliary co-extrusion section in the micro-runner, and further effectively overcoming the defects of extrusion swelling, unstable interface, distortion and the like caused by unbalanced stress, shear rate or flow of the melt.
Drawings
Fig. 1 is a front view of a preferred embodiment of the present invention.
Fig. 2 is a top view of a preferred embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a bar-clad composite article according to a preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand and clear.
Referring to fig. 1-2, a gas-assisted micro-extrusion molding device for polymer processing comprises a core layer melt inlet 1, a die core layer 2, a die shell layer 3, a shell layer melt storage area 4, a co-extrusion transition section 5, an air chamber 6, an air chamber cavity 7, a bottom plate 8, a gas-assisted micro-extrusion runner 9, a die air inlet gap 10, a sealing ring 11 and a shell layer melt inlet 12, wherein the die core layer 2 and the die shell layer 3 are connected and matched through bolts to form a die feeding section, the die is cylindrical, the inner cavity of the die core layer 2 is a core layer melt flow channel which is of a hollow structure, the upper end of the inner cavity of the die core layer 2 is of a conical structure, so that melt can flow from the core layer melt inlet 1 conveniently, the lower end of the die core layer is of a round structure, the round structure size is the outer diameter of a bar core layer, the inner cavity of the die shell layer 3 is of a cylindrical cavity, so that melt can be conveniently stored, and the die shell layer melt storage area 4 is formed by the die core layer 3 and the lower end of the die core layer 2, and the shell layer melt storage area 12 is arranged on one side of the melt storage area 4; the co-extrusion transition section 5 is a flow channel before entering the gas-assisted co-extrusion section after two layers of melt are converged, and is arranged below the die shell layer 3, so that two layers of polymer melt flowing through the inner cavity of the die core layer 2 and the inner cavity of the die shell layer 3 are converged into a whole; the air chamber cavity 7 and the bottom plate 8 form an air chamber 6 together, the air chamber cavity 7 and the bottom plate 8 are used for storing air conveyed by a high-pressure air tank, the air chamber cavity is used for stabilizing air flow and air pressure, the air can stably flow into an air-assisted micro co-extrusion flow channel 9, a sealing ring 11 is arranged at the contact part of the air chamber cavity 7 and the bottom plate 8, the air-assisted micro co-extrusion flow channel 9 is arranged in the middle of the bottom plate 8 and used for a flow channel after two polymer melts are converged, the diameter of the air-assisted micro co-extrusion flow channel 9 is about 0.2mm larger than the outer diameter of a bar shell, namely, the thickness of a reserved air cushion film layer is 0.1mm, the air chamber cavity is a key structure for guaranteeing the shape and the dimensional precision of a polymer bar micro co-extrusion product, and the co-extrusion transition section and the air chamber 6 form an air-assisted co-extrusion section for extruding the melt; meanwhile, a die air inlet gap 10 of 0.1-0.2 mm is reserved on the upper surface of the bottom plate 8 and the lower surface of the co-extrusion transition section 5, and is a flow channel for air in the air chamber 6 to enter the air-assisted micro co-extrusion flow channel 9.
In this embodiment, the core melt and the shell melt are respectively introduced into the dies from the core melt inlet 1 and the shell melt inlet 12, the core melt flows through the tapered convergence section and then enters the core melt flow channel, the shell melt enters the die from the shell melt storage area 4, then enters the co-extrusion transition section 5, merges with the core melt, the gas enters the gas-assisted micro-co-extrusion runner 9 from the gas chamber 6 at the junction of the core melt and the shell melt through the die inlet slit 10, and finally the melt is extruded along with the gas from the gas-assisted co-extrusion section to obtain the bar cladding composite product, as shown in fig. 3, including the bar cladding composite product core layer 13 and the bar cladding composite product shell layer 14; the gas auxiliary technology is applied to polymer micro-co-extrusion molding, and gas in the gas chamber 6 enters the gas auxiliary micro-co-extrusion flow channel 9 at a low speed to form a stable gas cushion film layer with the thickness of about 0.1mm between the surface of a melt and the wall surface of a die, so that the flow of the melt in the gas auxiliary micro-co-extrusion flow channel 9 is converted from non-slipping adhesive shear flow to non-adhesive shear flow with complete slipping, the stress and the shear rate of the melt in a gas auxiliary co-extrusion section in the micro-flow channel are sufficiently reduced, and the defects of extrusion swelling, unstable interface, distortion and the like caused by melt stress, shear rate or flow imbalance are further effectively improved.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The gas-assisted micro-coextrusion forming device for polymer processing comprises a die feeding section, a coextrusion transition section and a gas-assisted coextrusion section, wherein the die feeding section, the coextrusion transition section and the gas-assisted coextrusion section are formed by a die core layer and a die shell layer, the gas-assisted micro-coextrusion forming device is characterized in that an inner cavity of the die core layer is a core layer melt flow channel and is of a hollow structure, the upper end of the inner cavity of the die core layer serving as a core layer melt inlet is of a conical structure, the lower end of the inner cavity of the die core layer is of a circular structure, the size of the circular structure is equal to the outer diameter of a bar core layer, the inner cavity of the die shell layer is a shell layer melt flow channel, the die shell layer and the lower end of the die core layer form a shell layer melt storage area, and one side of the shell layer melt storage area is provided with a shell layer melt inlet; the co-extrusion transition section serving as a flow channel before the two layers of polymer melt are converged and enter the gas-assisted co-extrusion section is arranged below the die shell layer, so that the polymer melt flowing through the die core layer inner cavity and the die shell inner cavity are converged into a whole; the air chamber cavity and the bottom plate form an air chamber together, so that the air can stably flow into the air-assisted micro co-extrusion flow channel; the middle of the bottom plate is provided with a gas-assisted micro-co-extrusion flow channel which is used for a flow channel after two layers of polymer melt are converged, the diameter of the gas-assisted micro-co-extrusion flow channel is larger than the outer diameter of a bar shell, and a gas-assisted co-extrusion section is formed by a co-extrusion transition section and an air chamber and is used for extruding the melt; and a die air inlet gap serving as an air inlet air auxiliary micro-co-extrusion runner of air in the air chamber is reserved on the upper surface of the bottom plate and the lower surface of the co-extrusion transition section, so that an air cushion film layer is formed between the surface of the melt and the wall surface of the die, the air inlet gap of the die is 0.1-0.2 mm, and the thickness of the air cushion film layer is 0.1mm.
2. A gas-assisted micro-co-extrusion apparatus for polymer processing according to claim 1, wherein the die is cylindrical.
3. A gas-assisted micro-co-extrusion apparatus for polymer processing according to claim 1, wherein a sealing ring is provided at the contact of the chamber cavity with the bottom plate.
4. The gas-assisted micro-coextrusion device according to claim 1, wherein the die shell cavity is a cylindrical cavity.
5. A gas-assisted micro-co-extrusion apparatus for polymer processing according to claim 1, wherein the gas-assisted micro-co-extrusion flow channel diameter is 0.2mm larger than the outer diameter of the bar shell.
6. The gas-assisted micro-co-extrusion apparatus for polymer processing according to any one of claims 1 to 5, wherein the micro-co-extrusion apparatus is used for preparing a bar-coated composite product, comprising the following steps:
the method comprises the steps of firstly enabling a core layer melt and a shell layer melt to flow into a die from a core layer melt inlet and a shell layer melt inlet respectively, enabling the core layer melt to flow into a core layer melt flow channel after flowing through a conical convergence section, enabling the shell layer melt to flow into a shell layer melt storage area after flowing into the die from a shell layer melt inlet, enabling the core layer melt to flow into a co-extrusion transition section, enabling gas to flow into a gas-assisted micro-co-extrusion runner from a gas chamber at the junction of the core layer melt and the shell layer melt through a gas inlet gap of a die, and finally enabling the melt to be extruded from the gas-assisted co-extrusion section along with the gas, thus obtaining the bar cladding composite product with the required appearance and size.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710982086.6A CN107553857B (en) | 2017-10-20 | 2017-10-20 | Gas-assisted micro-co-extrusion forming device for polymer processing |
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| CN201710982086.6A CN107553857B (en) | 2017-10-20 | 2017-10-20 | Gas-assisted micro-co-extrusion forming device for polymer processing |
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| CN107553857A CN107553857A (en) | 2018-01-09 |
| CN107553857B true CN107553857B (en) | 2024-04-05 |
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| CN112123732A (en) * | 2020-09-08 | 2020-12-25 | 佛山市南海崇泰防火材料有限公司 | Composite fire-proof strip, manufacturing method and manufacturing device thereof |
| CN115447026B (en) * | 2022-09-14 | 2023-05-16 | 南昌工程学院 | Device and method for recycling waste plastics |
| CN118372464B (en) * | 2024-06-25 | 2024-08-23 | 广东金明精机股份有限公司 | Two bubble forming device for thermal shrinkage plastic film |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000053393A1 (en) * | 1999-03-10 | 2000-09-14 | Cambridge University Technical Services Ltd | Method and apparatus for gas lubricating extrusion die |
| WO2006075366A1 (en) * | 2005-01-12 | 2006-07-20 | Toyo Seikan Kaisha, Ltd | Extrusion feed device for composite resin and composite resin lump |
| CN102615805A (en) * | 2012-03-22 | 2012-08-01 | 大连理工大学 | Right-angle extrusion die for multi-cavity plastic micro-pipe |
| CN104943122A (en) * | 2015-05-04 | 2015-09-30 | 柳和生 | Gas-assisted mouth die assembly |
| CN207403129U (en) * | 2017-10-20 | 2018-05-25 | 南昌工程学院 | A kind of gas for Polymer Processing aids in micro- coextrusion mold device |
-
2017
- 2017-10-20 CN CN201710982086.6A patent/CN107553857B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000053393A1 (en) * | 1999-03-10 | 2000-09-14 | Cambridge University Technical Services Ltd | Method and apparatus for gas lubricating extrusion die |
| WO2006075366A1 (en) * | 2005-01-12 | 2006-07-20 | Toyo Seikan Kaisha, Ltd | Extrusion feed device for composite resin and composite resin lump |
| CN102615805A (en) * | 2012-03-22 | 2012-08-01 | 大连理工大学 | Right-angle extrusion die for multi-cavity plastic micro-pipe |
| CN104943122A (en) * | 2015-05-04 | 2015-09-30 | 柳和生 | Gas-assisted mouth die assembly |
| CN207403129U (en) * | 2017-10-20 | 2018-05-25 | 南昌工程学院 | A kind of gas for Polymer Processing aids in micro- coextrusion mold device |
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| CN107553857A (en) | 2018-01-09 |
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