CN203937164U - A kind of supercritical fluid microcellular plastics extrusion foaming screw rod - Google Patents
A kind of supercritical fluid microcellular plastics extrusion foaming screw rod Download PDFInfo
- Publication number
- CN203937164U CN203937164U CN201420295007.6U CN201420295007U CN203937164U CN 203937164 U CN203937164 U CN 203937164U CN 201420295007 U CN201420295007 U CN 201420295007U CN 203937164 U CN203937164 U CN 203937164U
- Authority
- CN
- China
- Prior art keywords
- supercritical fluid
- section
- screw rod
- extrusion foaming
- plastics extrusion
- 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.)
- Active
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses a kind of supercritical fluid microcellular plastics extrusion foaming screw rod, screw rod is provided with ten functional sections, and each functional section is respectively the spline joint section, thread seal section, feeding section, the first compression section, the first metering section, barrier screen, supercritical fluid Injection Section, the second compression section, the second metering section and the screw head that connect successively.This supercritical fluid microcellular plastics extrusion foaming screw rod is compared with traditional screw rod, be provided with 10 functional sections, increase screw slenderness ratio, there is material plasticizing and good mixing effect, do not stop up barrel air inlet, not overflow, the feature such as pressure oscillation is little, material applicability is wide.
Description
Technical field
The utility model relates to cellular plastic continuous extrusion technical field, particularly a kind of supercritical fluid microcellular plastics extrusion foaming screw rod.
Background technology
Cellular plastic generally refers to that cell diameter is 0.1～10um, and cell density is 10
9～10
15individual/cm
3, density of material can reduce by 5%～95% novel foamed plastic before comparing foaming.In recent years, some supercritical fluids rely on that it is good to most organic matter solubility properties, viscosity is low, diffusion coefficient is large, nontoxic, do not fire, no solvent residue, cheap and easy to get, use the particular advantages such as safe, free from environmental pollution to become the desirable physical blowing agent of replacement traditional chemical blowing agent.
First supercritical fluid microcellular plastics extrusion foamed will make plastic pellet melting under screw rod shearing and material tube heater heat effect, high-pressure plunger pump injects supercritical fluid by extruder barrel gas injection port, makes supercritical fluid in barrel mix formation supercritical fluid/polymer melt single_phase system with fused materials by screw mixing effect.Tradition three-stage screw comprises feeding section, melt zone and three functional sections of metering section, vented screw mainly comprises feeding section, the first compression section, the first metering section, exhaust section, the second compression section and six functional sections of the second metering section, but, these two kinds of screw rods are all not suitable for being directly used in the extrusion foaming production of supercritical fluid cellular plastic, the following problem of ubiquity: easily there is solid accumulation at barrel supercritical fluid inlet dead angle place, is prone to the phenomenon of degrading or stopping up intake valve; Screw slenderness ratio is less, and residence time of material is short, and in supercritical fluid and Mixing of Polymer Melt inequality and extrusion, pressure oscillation is large; Screw metering section is partially short, causes that melt refluence amount is excessive causes gas injection port generation overflow problem etc. on barrel after head build-up pressure.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of plasticizing and mixed effect better, supercritical fluid microcellular plastics extrusion that material applicability the is wider screw rod that foams.
The technical solution of the utility model is: a kind of supercritical fluid microcellular plastics extrusion foaming screw rod, it is characterized in that, screw rod is provided with ten functional sections, and each functional section is respectively the spline joint section, thread seal section, feeding section, the first compression section, the first metering section, barrier screen, supercritical fluid Injection Section, the second compression section, the second metering section and the screw head that connect successively.
Described screw rod is the solid construction of integral type.
On the external cylindrical surface of described barrier screen, be evenly distributed with multiple feed wells and blow tank, according to the circumferencial direction of barrier screen, feed well and blow tank are alternately distributed, and are barriers between feed well and blow tank, and the gap between adjacent two barriers is 0.3～0.6mm.
The thread groove degree of depth of described supercritical fluid Injection Section is greater than the thread groove degree of depth of the second compression section or other functional section, and the screw thread of supercritical fluid Injection Section is provided with disconnection groove, respectively disconnects groove and is uniformly distributed along screw stem line.
On described supercritical fluid Injection Section, be provided with scraper pin with the corresponding part of supercritical fluid inlet of barrel, each scraper pin is uniformly distributed along screw stem line.The thread groove degree of depth of supercritical fluid Injection Section is greater than the thread groove degree of depth of other functional section, because thread groove is deepened suddenly, barrel internal pressure sharply declines, now supercritical fluid easily enters extruder, and carry under immixture and mix with melt at the screw thread that is provided with disconnection groove, the scraper pin of adding barrel gas injection port below is wiped the material of gas injection port dead angle acumulation off under screw rod turning effort, can effectively prevent its degraded or stop up gas injection port.
On described supercritical fluid Injection Section, the external diameter at scraper pin place equates with screw diameter; The thread groove deep equality of the height of each scraper pin and supercritical fluid Injection Section.
Described the second compression section and the second metering section are double thread; The second metering section is provided with 7～9 pitch, compares traditional screw rod, and its length is longer, has strengthened the conveying capacity of screw rod, reduces melt refluence amount, improves voltage regulation result simultaneously, reduces head pressure fluctuation, improves the phenomenon of barrel gas injection port overflow.
Described screw head is provided with multiple mixing pins, and each mixing pin is uniformly distributed along screw stem line.
The cross sectional shape of described mixing pin is circle, rectangle or rhombus.
In each functional section of above-mentioned screw-rod structure, barrier screen can promote solid phase fusion, stops not molten solid particle to pass through; Scraper pin can prevent supercritical fluid inlet dead angle solid accumulation on extruder barrel; Supercritical fluid Injection Section screw thread is provided with disconnection groove, and material stream is broken up, and is beneficial to mixing of supercritical fluid and material melt; The second metering section axial length is 7～9 pitch, reduces melt refluence amount in Rapid Establishment stabilization head pressure; Screw head is provided with multiple mixing pins, and further homogenizing melt material flow, forms equally distributed supercritical fluid/polymer entire body single_phase system.
When this supercritical fluid microcellular plastics extrusion foaming screw rod uses, its principle is: pellet enters the first compression section and the first metering section successively by feeding section, is issued to basic molten condition in the effect of screw rod shearing and material tube heater; Barrier screen makes material in feed well, blow tank, make vortex-like circulation movement under screw rod turning effort, impels melt further to mix and homogenizing, stops not molten solid particle to enter next section; Melt enters after supercritical fluid Injection Section, because thread groove is deepened suddenly, barrel internal pressure sharply declines, now supercritical fluid easily enters extruder, and carry under mixing effect and tentatively mix with melt at the screw thread that is provided with disconnection groove, the scraper pin of barrel gas injection port below is wiped the material of gas injection port dead angle acumulation off under screw rod turning effort, prevents its degraded or stops up gas injection port; Melt and supercritical fluid be Fast Compression and homogenizing under the second compression section of double thread, the second metering section effect, wherein the second metering section length is 7～9 pitch, strengthen the conveying capacity of screw rod, reduce melt refluence amount, improve voltage regulation result simultaneously, reduce head pressure fluctuation, improve barrel gas injection port overflow phenomenon; At screw head place, under the mixing section effect of mixing pin, form stable, equally distributed supercritical fluid/polymer melt single_phase system, finally send into extruding dies.
The utility model, with respect to prior art, has following beneficial effect:
This supercritical fluid microcellular plastics extrusion foaming screw rod is compared with traditional screw rod, be provided with 10 functional sections, increase screw slenderness ratio, there is material plasticizing and good mixing effect, do not stop up barrel air inlet, not overflow, the feature such as pressure oscillation is little, material applicability is wide.
Brief description of the drawings
Fig. 1 is the structural representation of this supercritical fluid microcellular plastics extrusion foaming screw rod.
Fig. 2 is the structural representation of barrier screen.
Fig. 3 is that the A-A of Fig. 2 is to view.
Fig. 4 is the schematic cross-section that supercritical fluid Injection Section is provided with scraper pin place.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
A kind of supercritical fluid microcellular plastics extrusion foaming of the present embodiment screw rod, as shown in Figure 1, screw rod is provided with ten functional sections, and each functional section is respectively the spline joint section 1, thread seal section 2, feeding section 3, the first compression section 4, the first metering section 5, barrier screen 6, supercritical fluid Injection Section 7, the second compression section 8, the second metering section 9 and the screw head 10 that connect successively.
Screw rod is the solid construction of integral type.
As shown in Figure 2 or Figure 3, on the external cylindrical surface of barrier screen, be evenly distributed with multiple feed well 6-1 and blow tank 6-2, according to the circumferencial direction of barrier screen, feed well and blow tank are alternately distributed, between feed well and blow tank, be barriers 6-3, the gap between adjacent two barriers is 0.3～0.6mm.
The thread groove degree of depth of supercritical fluid Injection Section is greater than the thread groove degree of depth of the second compression section or other functional section, and the screw thread of supercritical fluid Injection Section is provided with disconnection groove, respectively disconnects groove and is uniformly distributed along screw stem line.
As shown in Fig. 1 or 4, on supercritical fluid Injection Section, be provided with scraper pin 11 with the corresponding part of supercritical fluid inlet of barrel, each scraper pin is uniformly distributed along screw stem line.The thread groove degree of depth of supercritical fluid Injection Section is greater than the thread groove degree of depth of other functional section, because thread groove is deepened suddenly, barrel internal pressure sharply declines, now supercritical fluid easily enters extruder, and carry under immixture and mix with melt at the screw thread that is provided with disconnection groove, the scraper pin of adding barrel gas injection port below is wiped the material of gas injection port dead angle acumulation off under screw rod turning effort, can effectively prevent its degraded or stop up gas injection port.
On supercritical fluid Injection Section, the external diameter at scraper pin place equates with screw diameter; The thread groove deep equality of the height of each scraper pin and supercritical fluid Injection Section.
The second compression section and the second metering section are double thread; The second metering section is provided with 7～9 pitch, compares traditional screw rod, and its length is longer, has strengthened the conveying capacity of screw rod, reduces melt refluence amount, improves voltage regulation result simultaneously, reduces head pressure fluctuation, improves the phenomenon of barrel gas injection port overflow.
As shown in Figure 1, screw head is provided with multiple mixing pins, and each mixing pin is uniformly distributed along screw stem line.
The cross sectional shape of mixing pin can be circle, rectangle or rhombus.
In each functional section of above-mentioned screw-rod structure, barrier screen can promote solid phase fusion, stops not molten solid particle to pass through; Scraper pin can prevent supercritical fluid inlet dead angle solid accumulation on extruder barrel; Supercritical fluid Injection Section screw thread is provided with disconnection groove, and material stream is broken up, and is beneficial to mixing of supercritical fluid and material melt; The second metering section axial length is 7～9 pitch, reduces melt refluence amount in Rapid Establishment stabilization head pressure; Screw head is provided with multiple mixing pins, and further homogenizing melt material flow, forms equally distributed supercritical fluid/polymer entire body single_phase system.
When this supercritical fluid microcellular plastics extrusion foaming screw rod uses, its principle is: pellet enters the first compression section and the first metering section successively by feeding section, is issued to basic molten condition in the effect of screw rod shearing and material tube heater; Barrier screen makes material in feed well, blow tank, make vortex-like circulation movement under screw rod turning effort, impels melt further to mix and homogenizing, stops not molten solid particle to enter next section; Melt enters after supercritical fluid Injection Section, because thread groove is deepened suddenly, barrel internal pressure sharply declines, now supercritical fluid easily enters extruder, and carry under mixing effect and tentatively mix with melt at the screw thread that is provided with disconnection groove, the scraper pin of barrel gas injection port below is wiped the material of gas injection port dead angle acumulation off under screw rod turning effort, prevents its degraded or stops up gas injection port; Melt and supercritical fluid be Fast Compression and homogenizing under the second compression section of double thread, the second metering section effect, wherein the second metering section length is 7～9 pitch, strengthen the conveying capacity of screw rod, reduce melt refluence amount, improve voltage regulation result simultaneously, reduce head pressure fluctuation, improve barrel gas injection port overflow phenomenon; At screw head place, under the mixing section effect of mixing pin, form stable, equally distributed supercritical fluid/polymer melt single_phase system, finally send into extruding dies.
As mentioned above, just can realize preferably the utility model, above-described embodiment is only preferred embodiment of the present utility model, is not used for limiting practical range of the present utility model; Be that all equalizations of doing according to the utility model content change and modify, all by the utility model claim scope required for protection is contained.
Claims (9)
1. a supercritical fluid microcellular plastics extrusion foaming screw rod, it is characterized in that, screw rod is provided with ten functional sections, and each functional section is respectively the spline joint section, thread seal section, feeding section, the first compression section, the first metering section, barrier screen, supercritical fluid Injection Section, the second compression section, the second metering section and the screw head that connect successively.
2. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 1, is characterized in that the solid construction that described screw rod is integral type.
3. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 1, it is characterized in that, on the external cylindrical surface of described barrier screen, be evenly distributed with multiple feed wells and blow tank, according to the circumferencial direction of barrier screen, feed well and blow tank are alternately distributed, between feed well and blow tank, be barriers, the gap between adjacent two barriers is 0.3～0.6mm.
4. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 1, it is characterized in that, the thread groove degree of depth of described supercritical fluid Injection Section is greater than the thread groove degree of depth of the second compression section, the screw thread of supercritical fluid Injection Section is provided with disconnection groove, respectively disconnects groove and is uniformly distributed along screw stem line.
5. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 4, it is characterized in that, on described supercritical fluid Injection Section, be provided with scraper pin with the corresponding part of supercritical fluid inlet of barrel, each scraper pin is uniformly distributed along screw stem line.
6. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 5, is characterized in that, on described supercritical fluid Injection Section, the external diameter at scraper pin place equates with screw diameter; The thread groove deep equality of the height of each scraper pin and supercritical fluid Injection Section.
7. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 1, is characterized in that, described the second compression section and the second metering section are double thread; The second metering section is provided with 7～9 pitch.
8. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 1, is characterized in that, described screw head is provided with multiple mixing pins, and each mixing pin is uniformly distributed along screw stem line.
9. a kind of supercritical fluid microcellular plastics extrusion foaming screw rod according to claim 8, is characterized in that, the cross sectional shape of described mixing pin be circle, rectangle or rhombus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420295007.6U CN203937164U (en) | 2014-06-04 | 2014-06-04 | A kind of supercritical fluid microcellular plastics extrusion foaming screw rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420295007.6U CN203937164U (en) | 2014-06-04 | 2014-06-04 | A kind of supercritical fluid microcellular plastics extrusion foaming screw rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203937164U true CN203937164U (en) | 2014-11-12 |
Family
ID=51856510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420295007.6U Active CN203937164U (en) | 2014-06-04 | 2014-06-04 | A kind of supercritical fluid microcellular plastics extrusion foaming screw rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203937164U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105196502A (en) * | 2015-10-28 | 2015-12-30 | 武汉理工大学 | Micropore plastic injection-molded threaded rod |
| CN105922538A (en) * | 2016-05-23 | 2016-09-07 | 上海译科实业有限公司 | Extruder screw rod for polymer foaming process and extruder with screw rod |
| CN107455787A (en) * | 2017-10-10 | 2017-12-12 | 广州市国研机械设备制造有限公司 | Face or the extrusion mechanism of bean product |
| CN109352948A (en) * | 2018-10-15 | 2019-02-19 | 深圳市信维通信股份有限公司 | A kind of forming method of extrusion equipment and LCP sheet material |
| CN109843540A (en) * | 2016-10-28 | 2019-06-04 | 陶氏环球技术有限责任公司 | Energy transmission screw rod and improved extrusion process |
| CN113787689A (en) * | 2021-01-05 | 2021-12-14 | 浙江枫叶管业科技股份有限公司 | High-toughness PE pipe extrusion device and production process |
-
2014
- 2014-06-04 CN CN201420295007.6U patent/CN203937164U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105196502A (en) * | 2015-10-28 | 2015-12-30 | 武汉理工大学 | Micropore plastic injection-molded threaded rod |
| CN105922538A (en) * | 2016-05-23 | 2016-09-07 | 上海译科实业有限公司 | Extruder screw rod for polymer foaming process and extruder with screw rod |
| CN105922538B (en) * | 2016-05-23 | 2022-03-29 | 上海译科实业有限公司 | Extruder screw for a process for foaming polymers and extruder with such a screw |
| CN109843540A (en) * | 2016-10-28 | 2019-06-04 | 陶氏环球技术有限责任公司 | Energy transmission screw rod and improved extrusion process |
| CN107455787A (en) * | 2017-10-10 | 2017-12-12 | 广州市国研机械设备制造有限公司 | Face or the extrusion mechanism of bean product |
| CN107455787B (en) * | 2017-10-10 | 2023-11-10 | 广州市国研机械设备制造有限公司 | Extrusion mechanism for flour or bean products |
| CN109352948A (en) * | 2018-10-15 | 2019-02-19 | 深圳市信维通信股份有限公司 | A kind of forming method of extrusion equipment and LCP sheet material |
| CN109352948B (en) * | 2018-10-15 | 2023-12-19 | 深圳市信维通信股份有限公司 | Extrusion equipment and molding method of LCP (liquid crystal display) sheet |
| CN113787689A (en) * | 2021-01-05 | 2021-12-14 | 浙江枫叶管业科技股份有限公司 | High-toughness PE pipe extrusion device and production process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203937164U (en) | A kind of supercritical fluid microcellular plastics extrusion foaming screw rod | |
| CN203937090U (en) | A kind of supercritical fluid Microcellular Plastics Extrusion Processing device | |
| CN104085073B (en) | Apparatus and method for extrusion moulding of supercutical-fluid micropore plastic | |
| CN103057061B (en) | Efficient mixing microcellular plastics precise injection molding apparatus and method | |
| CN103056979B (en) | Based on macromolecular material continuous mixing process intensification method and the device of eccentric screw | |
| CN203637196U (en) | Equipment for producing polyolefin foamed plastic product | |
| CN101219573A (en) | Supercritical fluid auxiliary polyalcohol contour machining equipment, implementing method and application thereof | |
| CN201195384Y (en) | Auxiliary polymer molding processing apparatus for supercritical fluid | |
| CN104231462A (en) | GPES rigid foam composite plastic insulation board and manufacturing method thereof | |
| CN102529062A (en) | Screw rod assembly used for extrusion processing without dry processing to nylon | |
| CN102126274A (en) | Micro-foaming injection-molding screw rod | |
| CN104589618A (en) | Special two-section BM type screw rod for wire and cable extruder | |
| CN203110304U (en) | Plastic extruder screw rod | |
| CN102205609B (en) | Micro-foaming injection-molded screw | |
| CN103273659A (en) | Carbon dioxide foaming type plastic extrusion plate equipment | |
| CN106273289A (en) | A kind of plasticizing rotor of pitches | |
| CN208529693U (en) | A kind of high density polyethylene (HDPE) extruding pipe material bolt special | |
| CN203994419U (en) | Injection machine is without being detained plunger injection accumulator structure | |
| CN203031916U (en) | Twin-screw thread element | |
| CN108247982B (en) | Large-scale awl pair of extruder foaming screw rod | |
| CN202079764U (en) | Screw of plastic extruder | |
| CN204526092U (en) | The special two sections of BM formula screw rods of electric wire extruder | |
| CN212072902U (en) | Screw structure for extruding and granulating high-strength glass fiber reinforced material | |
| CN202764180U (en) | Screw assembly for extrusion processing of nylon without nylon drying process | |
| CN104325615A (en) | Double screw extrusion foaming device for preparation of PET (polyethylene terephthalate) foamed plastic by use of supercritical CO2 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |