CN108621358A - A kind of differential gas injection structures and methods - Google Patents
A kind of differential gas injection structures and methods Download PDFInfo
- Publication number
- CN108621358A CN108621358A CN201810628636.9A CN201810628636A CN108621358A CN 108621358 A CN108621358 A CN 108621358A CN 201810628636 A CN201810628636 A CN 201810628636A CN 108621358 A CN108621358 A CN 108621358A
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- CN
- China
- Prior art keywords
- gas injection
- helical teeth
- differential
- section
- flow splitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 62
- 239000007924 injection Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001746 injection moulding Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000005187 foaming Methods 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims description 2
- 125000003003 spiro group Chemical group 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 238000007493 shaping process Methods 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
Include extruder or injection molding machine with screw rod the present invention relates to a kind of differential gas injection structure, further include gas injection system, the machine barrel of extruder or injection molding machine is equipped with the gas injection port of corresponding melt zone, and gas injection system accesses gas injection port；Screw rod, which corresponds to, is equipped with one section of helical teeth section at melt zone；Differential gas injection structure further includes the flow splitter being fixed in machine barrel, and flow splitter is sleeved on outside helical teeth section, and air storage chamber is surrounded between flow splitter and machine tube inner wall, and multiple air admission holes are evenly distributed on flow splitter, and gas injection port, air storage chamber, air admission hole, the inside of flow splitter are interconnected.Further relate to a kind of differential inflating method.The present invention ensures that the material of each fraction can all come into full contact with supercritical fluid, so that it is guaranteed that gas/polymer homogeneous system is formed in 30s, belongs to extrusion or injection foaming field shaping technique.
Description
Technical field
The present invention relates to extrusion or injection foaming forming techniques, and in particular to a kind of differential gas injection structures and methods.
Background technology
Currently, the application of foaming technique is more and more wider.Under normal circumstances, in injection molding or extrusion and foaming process, usually
Supercritical fluid can be injected in the gas injection port of screw rod homogenizing zone front end, keep it equal with the melt in extruder or injecting machine material tube
Even mixing, then forms gas/polymer homogeneous system under the strong immixture of screw rod, and homogeneous system is passing through extruder machine
When head, prodigious pressure drop and pressure drop rate are will produce, the great thermodynamic phase of system is caused, to cause bubble
Nucleation completes extrusion and foaming process.However, the formation of gas/polymer homogeneous system must be in several minutes or even tens seconds
It completes, the formation of gas/polymer homogeneous system is accelerated just to be particularly important.
Invention content
For the technical problems in the prior art, the purpose of the present invention is：It is equal to provide a kind of acceleration gas/polymer
The differential gas injection structures and methods that phase system is formed.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of differential gas injection structure includes extruder or injection molding machine with screw rod, further includes gas injection system, extruder or
The machine barrel of injection molding machine is equipped with the gas injection port of corresponding melt zone, and gas injection system accesses gas injection port；Screw rod is corresponded to and is equipped at melt zone
One section of helical teeth section；Differential gas injection structure further includes the flow splitter being fixed in machine barrel, and flow splitter is sleeved on outside helical teeth section, flow splitter and
Surround air storage chamber between machine tube inner wall, uniformly distributed multiple air admission holes on flow splitter, gas injection port, air storage chamber, air admission hole, flow splitter it is interior
Side is interconnected.
As a preferred embodiment, flow splitter is cylindrical shape, it is arranged concentrically with machine barrel；The quantity of air admission hole is 2nA, wherein n takes
Positive integer；All air inlet positions are on same cross section, and even circumferential is distributed.
As a preferred embodiment, the circle spacing of adjacent air admission hole is more than the width of the spiral shell rib of helical teeth section.
As a preferred embodiment, air admission hole is circular through hole.
As a preferred embodiment, the internal diameter of air admission hole is 5-7mm, the helical angle of helical teeth is 4-6 ° in helical teeth section.
As a preferred embodiment, the spacing of the inside in the outside and flow splitter of helical teeth section is 0.1-0.25mm, the length of helical teeth section
Degree is 1/8th of spiro rod length.
As a preferred embodiment, extruder is single screw extrusion machine, screw slenderness ratio 25-40.
As a preferred embodiment, injection molding machine is single screw rod injection molding machine, screw slenderness ratio 18-24.
A kind of differential inflating method is squeezed out or when injection foaming, material is revolved with screw rod using a kind of differential gas injection structure
Before steering, fused materials are divided into several fractions by the helical teeth of helical teeth section, and 2nA air admission hole is noted by gas injection system simultaneously
Enter supercritical fluid, the material of fraction each in this way can come into full contact with supercritical fluid, so that it is guaranteed that gas/polymer
Homogeneous system is formed in 30s.
As a preferred embodiment, choosing one section in the homogenizing zone front end of extruder or screw in injection molding machine, make screw thread into helical teeth
Colyliform, to form helical teeth segment structure.
Generally speaking, the invention has the advantages that：
1. when the present invention is applied to extrusion or injection foaming, forward with screw rod rotation, the wheel of screw rod homogenizing zone front end
Fused materials can be divided into several fractions by tooth, and 2nThe gas injection simultaneously of a air admission hole, the material of each fraction all can with it is super
Critical fluids come into full contact with, so that it is guaranteed that gas/polymer homogeneous system is formed in 30s.
2. it is simple in structure, it is easy to operate, existing extruder or injection molding machine can be reequiped.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 a are the sectional views of Fig. 1 midship sections I-I.
Fig. 2 b are the side views of Fig. 2 a.
Fig. 3 is the structural schematic diagram of screw rod of the present invention.
Fig. 4 is the sectional view of Fig. 3 midship sections II-II.
Fig. 5 is the distribution map of air storage chamber and air admission hole in barrel wall.
Wherein, 1- reduction boxes；2- motor；3- casing drums；4- screw rods；5- gas injection ports；6- thermocouples；7- pressure sensings
Device；8- heads；9- gas injection systems；10- helical teeth；11- barrel walls；12- air storage chambers；13- flow splitters；14- screw rods；15- air admission holes；
D is the internal diameter of air admission hole.
Specific implementation mode
Below in conjunction with specific implementation mode, the present invention will be further described in detail.
A kind of differential gas injection structure includes extruder or injection molding machine with screw rod, further includes gas injection system, extruder or
The machine barrel of injection molding machine is equipped with the gas injection port of corresponding melt zone, and gas injection system accesses gas injection port；Screw rod is corresponded to and is equipped at melt zone
One section of helical teeth section；Differential gas injection structure further includes the flow splitter being fixed in machine barrel, and flow splitter is sleeved on outside helical teeth section, flow splitter and
Surround air storage chamber between machine tube inner wall, uniformly distributed multiple air admission holes on flow splitter, gas injection port, air storage chamber, air admission hole, flow splitter it is interior
Side is interconnected.
The extruder of the present embodiment is single screw extrusion machine, including：Reduction box, motor, casing drum, machine barrel, screw rod, note
Gas port, thermocouple, pressure sensor and head.Screw rod is located in machine barrel, is driven and is rotated by reduction box by motor；On machine barrel
Equipped with casing drum and gas injection port, gas injection port corresponds to melt zone setting；Head is equipped with pressure sensor and thermocouple.
Flow splitter is cylindrical shape, is arranged concentrically with machine barrel；The quantity of air admission hole is 2nA, wherein n takes positive integer, this implementation
The quantity of air admission hole is 16 in example；All air inlet positions are on same cross section, and even circumferential is distributed.Adjacent air admission hole
Circle spacing is more than the width of the spiral shell rib of helical teeth section, and to ensure during gas injection, gas will not be blocked by spiral shell rib.Air admission hole
The size of internal diameter d should be determined according to different process conditions and gaseous species.When in the generating process of extrusion foaming, it is desirable that production
Amount is 80kg/h, and gas injection rate 10%, physical blowing agent is carbon dioxide, blow pressure 10MPa.It is squeezed using the present invention
Go out foaming to generate, then by calculating it is found that the size of d at this time should be 6.22mm.When yield and gas injection rate are constant, foaming agent kind
Class is butane, and the size by calculating d then at this time is 5.54mm.
One section is chosen in the homogenizing zone front end of extruder or screw in injection molding machine, makes screw thread into helical teeth colyliform, it is oblique to be formed
Tooth segment structure.In the present embodiment, screw diameter 23mm is L/d from screw slenderness ratio：25.The helical angle of helical teeth in helical teeth section
It is 4 °.The spacing of the outside of helical teeth section and the inside of flow splitter is 0.1mm, and the length of helical teeth section is 74.4mm.In the present embodiment,
The helical gear number of teeth is 8.Forward with screw rod rotation, fused materials can be divided into 8 fractions by the gear teeth of screw rod melt zone,
And 16 air admission hole gas injections simultaneously, the material of each fraction can all come into full contact with supercritical fluid, so that it is guaranteed that gas/poly-
Object homogeneous system is closed to be formed in 30s.
The whole work process of this differential gas injection structure is：The valve coupled with air accumulator is opened, so that gas is entered and carries
The high-pressure metering pump of temperature control system；The gas pressure for setting high-pressure metering pump is controlled by crossing high-pressure metering pump in foaming process
The gas pressure of injection.High pressure gas is entered by the gas injection port being fixed on machine barrel outer wall in air storage chamber, when gas is full of storage
After gas chamber, high pressure gas can enter in the air admission hole on flow splitter.Material is added from casing drum, by barrel heat
With the fusion plastification of screw rod, melt is made to be full of the screw channel of screw rod.The material melted this section with screw rod rotate forward, screw rod
Fused materials can be divided into 8 fractions by the gear teeth of homogenizing zone front end, and 16 air admission holes gas injections simultaneously, fraction each in this way
Material can be come into full contact with supercritical fluid, so that it is guaranteed that gas/polymer homogeneous system 30s in formed.Homogeneous system
When passing through cross-head, prodigious pressure drop and pressure drop rate are will produce, causes the great thermodynamic instability of system
Property, to cause bubble nucleating, complete extrusion and foaming process.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (10)
- Further include gas injection system, extruder or note 1. a kind of differential gas injection structure includes extruder or injection molding machine with screw rod The machine barrel of molding machine is equipped with the gas injection port of corresponding melt zone, and gas injection system accesses gas injection port, it is characterised in that：Screw rod corresponds to melting One section of helical teeth section is equipped at section；Differential gas injection structure further includes the flow splitter being fixed in machine barrel, and flow splitter is sleeved on outside helical teeth section, Air storage chamber is surrounded between flow splitter and machine tube inner wall, multiple air admission holes are evenly distributed on flow splitter, and gas injection port, air admission hole, divides air storage chamber The inside for flowing ring is interconnected.
- 2. a kind of differential gas injection structure described in accordance with the claim 1, it is characterised in that：Flow splitter is cylindrical shape, same with machine barrel The heart is arranged；The quantity of air admission hole is 2nA, wherein n takes positive integer；All air inlet positions are on same cross section, and even circumferential Distribution.
- 3. a kind of differential gas injection structure according to claim 2, it is characterised in that：The circle spacing of adjacent air admission hole is more than The width of the spiral shell rib of helical teeth section.
- 4. a kind of differential gas injection structure according to claim 2, it is characterised in that：Air admission hole is circular through hole.
- 5. a kind of differential gas injection structure according to claim 4, it is characterised in that：The internal diameter of air admission hole is 5-7mm, helical teeth The helical angle of helical teeth is 4-6 ° in section.
- 6. a kind of differential gas injection structure described in accordance with the claim 1, it is characterised in that：The outside of helical teeth section and flow splitter it is interior The spacing of side is 0.1-0.25mm, and the length of helical teeth section is 1/8th of spiro rod length.
- 7. a kind of differential gas injection structure described in accordance with the claim 1, it is characterised in that：Extruder is single screw extrusion machine, spiral shell Bar draw ratio is 25-40.
- 8. a kind of differential gas injection structure described in accordance with the claim 1, it is characterised in that：Injection molding machine is single screw rod injection molding machine, spiral shell Bar draw ratio is 18-24.
- 9. a kind of differential inflating method, using a kind of differential gas injection structure described in any item of the claim 1 to 8, feature It is：It squeezes out or when injection foaming, material rotates forward with screw rod, it is small that fused materials are divided into several by the helical teeth of helical teeth section Part, and 2nA air admission hole injects supercritical fluid by gas injection system simultaneously, the material of fraction each in this way can with it is super Critical fluids come into full contact with, so that it is guaranteed that gas/polymer homogeneous system is formed in 30s.
- 10. a kind of differential inflating method according to claim 9, it is characterised in that：In extruder or screw in injection molding machine Homogenizing zone front end chooses one section, makes screw thread into helical teeth colyliform, to form helical teeth segment structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628636.9A CN108621358B (en) | 2018-06-19 | 2018-06-19 | Differential gas injection structure and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628636.9A CN108621358B (en) | 2018-06-19 | 2018-06-19 | Differential gas injection structure and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108621358A true CN108621358A (en) | 2018-10-09 |
| CN108621358B CN108621358B (en) | 2024-01-09 |
Family
ID=63691860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810628636.9A Active CN108621358B (en) | 2018-06-19 | 2018-06-19 | Differential gas injection structure and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108621358B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113400758A (en) * | 2021-07-21 | 2021-09-17 | 南京越升挤出机械有限公司 | Physical foaming lightweight sheet and preparation method thereof |
| CN115157615A (en) * | 2022-05-31 | 2022-10-11 | 临安东宸塑件有限公司 | Continuous extrusion equipment and continuous extrusion processing technology of microporous PC lampshade |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410979A (en) * | 1972-04-14 | 1975-10-22 | Ici Ltd | Process for the dispersion of blowing agents in thermoplastics |
| US20010047042A1 (en) * | 2000-05-25 | 2001-11-29 | Anderson Jere R. | Polymer foam processing with low blowing agent levels |
| JP2007276321A (en) * | 2006-04-10 | 2007-10-25 | Japan Steel Works Ltd:The | Tandem type extrusion foaming molding process |
| CN102350780A (en) * | 2011-07-13 | 2012-02-15 | 北京化工大学 | Apparatus and method for preparing polymer foam material based on differential principle |
| CN208558089U (en) * | 2018-06-19 | 2019-03-01 | 华南理工大学 | A kind of differential gas injection structure |
-
2018
- 2018-06-19 CN CN201810628636.9A patent/CN108621358B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410979A (en) * | 1972-04-14 | 1975-10-22 | Ici Ltd | Process for the dispersion of blowing agents in thermoplastics |
| US20010047042A1 (en) * | 2000-05-25 | 2001-11-29 | Anderson Jere R. | Polymer foam processing with low blowing agent levels |
| JP2007276321A (en) * | 2006-04-10 | 2007-10-25 | Japan Steel Works Ltd:The | Tandem type extrusion foaming molding process |
| CN102350780A (en) * | 2011-07-13 | 2012-02-15 | 北京化工大学 | Apparatus and method for preparing polymer foam material based on differential principle |
| CN208558089U (en) * | 2018-06-19 | 2019-03-01 | 华南理工大学 | A kind of differential gas injection structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113400758A (en) * | 2021-07-21 | 2021-09-17 | 南京越升挤出机械有限公司 | Physical foaming lightweight sheet and preparation method thereof |
| CN115157615A (en) * | 2022-05-31 | 2022-10-11 | 临安东宸塑件有限公司 | Continuous extrusion equipment and continuous extrusion processing technology of microporous PC lampshade |
| CN115157615B (en) * | 2022-05-31 | 2024-05-28 | 临安东宸塑件有限公司 | Continuous extrusion equipment and continuous extrusion processing technology of microporous PC lampshade |
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| Publication number | Publication date |
|---|---|
| CN108621358B (en) | 2024-01-09 |
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