CN200939682Y - Super-critical fluid auxilary micro-porous injection apparatus - Google Patents
Super-critical fluid auxilary micro-porous injection apparatus Download PDFInfo
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- CN200939682Y CN200939682Y CN 200620064115 CN200620064115U CN200939682Y CN 200939682 Y CN200939682 Y CN 200939682Y CN 200620064115 CN200620064115 CN 200620064115 CN 200620064115 U CN200620064115 U CN 200620064115U CN 200939682 Y CN200939682 Y CN 200939682Y
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- supercritical fluid
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Abstract
The utility model provides a supercritical fluid auxiliary micropore injection molding equipment, which comprises an injection molding machine, a nozzle component, a mold system and a supercritical fluid measuring and feeding device. The nozzle component, which is a mixing type and self-locking, comprises a static mixer, a mixing head and a self-locking nozzle and is connected with the injection molding machine with a gas injection flange, which is connected with the supercritical fluid measuring and feeding device. The static mixer is connected with the injection molding machine and the self-locking nozzle is connected with the static mixer through a bushing. The mixing head is arranged on the entrance of the self-locking nozzle. The utility model enables supercritical fluid auxiliary micropore injection on common injection molding machines and in comparison with prior arts, the utility model has the advantages of compact structure, wide application, easiness for use, small space, saving of materials, low production costs, improvement of the rigidity/quality ratio of finished products, reduction of energy consumption and nonexistence of environmental pollution.
Description
Technical field
The utility model relates to a kind of injection-moulding device, particularly a kind of supercritical fluid assistant micropore injection moulding apparatus.
Background technology
Microporous polymer be meant abscess-size at 1～100 μ m, cell density 10
9～10
15Individual/cm
3Foamed polymer.The abscess of microporous polymer is minimum and be evenly distributed, and makes the microgap circular holeization in the polymer, plays the effect of toughness reinforcing enhancing, so microporous polymer not only can be saved material, and the polymer that some mechanical properties is arranged even be better than not foaming.With respect to traditional blowing agent, supercritical fluid (CO
2, N
2Deng) have advantages such as good stability, cost are low, non-environmental-pollution, yet supercritical fluid is stably injected in the injection machine of HTHP, and in the limited time and barrel length, supercritical fluid is dispersed in forms polymer/supercritical fluid homogeneous system in the polymer melt, these difficult problems hamper the application of supercritical fluid assistant micropore injection moulding.In addition, how controlling the form of abscess, obtain the high-performance foam material of microcellular structure, also is the difficult point of this technology.
The patent No. is that the Chinese utility model patent of ZL 200320119112.6 discloses a kind of equipment that is used for plastic injection-moulded foaming, as shown in Figure 1; By two rank injection moulding apparatus, finish plasticizing and injection process respectively, can realize the processing of injection foaming goods, but because this equipment lacks supercritical fluid metering system and necessary mixing elements, can not be used for the processing of microporous polymer, can not use supercritical fluid as blowing agent, can only use CBA.So this equipment can not be finished micropore injection moulding, and, make its scope of application be subjected to certain restriction because employed CBA has certain environmental pollution.
The patent No. is that U.S.'s patent of invention of US 6579910 B2 discloses a kind of supercritical CO
2Micropore injection moulding apparatus, as shown in Figure 2; This equipment is the injection machine of one two stepwise, comprises a transformed single screw extrusion machine and injection device, and single screw extrusion machine is mainly used to the plasticizing polymerization thing, and the supercritical CO that injects
2Be dispersed in the polymer melt, after forming homogeneous system, it is sent in the storage cavity of injection device, when the required material of the full shot of storage in the storage cavity, promote the nozzle of melt by the bar that shoots material, inject die cavity, melt nucleation then through a fast pressure relief, abscess is grown up, and cooling also finally obtains the injection-molded item of microcellular structure.This occupation area of equipment is big, the process-cycle long, control is complicated, and the production cost height, than difficulty popularization and application on a large scale.
The utility model content
At the problem that exists in the above-mentioned microporous polymer injection moulding, the purpose of this utility model is to provide a kind of and can passes through common injection machine transformation, realize the equipment of supercritical fluid assistant micropore injection moulding, supercritical fluid metering and conveying device are combined with mixed milling type self-locking nozzle assembly, make supercritical fluid injection of polymer melt, and before injecting mould, forming homogeneous system, polymer/supercritical fluid homogeneous system forms the microporous polymer Tetramune injecting the mould post-foaming.
The purpose of this utility model is achieved through the following technical solutions: a kind of supercritical fluid assistant micropore injection moulding apparatus comprises injection machine, nozzle assembly, mold system and supercritical fluid metering and conveying device; It is characterized in that: described nozzle assembly is a mixed milling type self-locking nozzle assembly, and mixed milling type self-locking nozzle assembly is connected by the gas injection flange with injection machine, and described gas injection flange is connected with conveying device with the supercritical fluid metering.
Described mixed milling type self-locking nozzle assembly comprises static mixer, mixing refining head, self-locking nozzle, and static mixer is connected with injection machine, and the self-locking nozzle is connected with static mixer by adapter sleeve, is provided with mixing refining head in the porch of self-locking nozzle.This mixed milling type self-locking nozzle assembly can be kept polymer/supercritical fluid homogeneous system under certain hyperbaric environment, produces the excellent pressure maintaining effect, and provides good immixture for it.
Described self-locking nozzle comprises connector, back push rod, torpedo body, preceding push rod, nozzle cover, spring, described connector is arranged at the end that the self-locking nozzle is connected with static mixer, the torpedo body is arranged between connector and the nozzle cover, axis at the torpedo body is provided with through hole, preceding push rod, spring and back push rod are arranged in the through hole, before push rod, back push rod be arranged at both ends of the spring and spring apical grafting mutually respectively, before the other end and the nozzle cover apical grafting mutually of push rod, the jet hole of nozzle cover is compressed sealing; The other end of back push rod and connector be apical grafting mutually, and the axial hole of connector is compressed sealing.
The front and back of described static mixer are equipped with pressure sensor and temperature sensor, can monitor the nozzle interpolymer/pressure of supercritical fluid homogeneous system, temperature.
Annular gas injection cover is installed in the described gas injection flange, and the outer surface of annular gas injection cover has crisscross groove, even distribution aperture in these grooves (its quantity can be several to up to a hundred), and inner surface then directly contacts with polymer melt.Supercritical fluid is by these aperture injection of polymer melts.
Described supercritical fluid metering and conveying device comprise gas storage tank, high-pressure metering pump, high-pressure solenoid valve, check valve, and gas storage tank is connected with high-pressure metering pump, and high-pressure metering pump is connected with the gas injection flange with check valve by high-pressure solenoid valve.Described high-pressure solenoid valve can make the injection of gas and the injection process of melt realize interlock; Described check valve can prevent that the polymer melt adverse current from entering gas pipeline.
Described high-pressure metering pump is provided with temperature control system, can control the temperature of the supercritical fluid of the high-pressure metering pump of flowing through.
Operation principle of the present utility model is: the gas in the gas storage tank enters the high-pressure metering pump that has temperature control system through valve; The temperature and pressure of control high-pressure metering pump makes this gas be in supercriticality; Set high pressure measurement delivery side of pump flow rate, make supercritical fluid with constant compression force and flow output; The supercritical fluid of output enters the front end of injection machine machine barrel through high-pressure solenoid valve, check valve, gas injection flange, annular gas injection cover.Simultaneously, polymer beads adds from the hopper of injection machine; Polymer is through the heating of machine barrel, and the plasticizing of screw rod, conveying make its fusion and arrive the machine barrel front end.Fusion and mixing homogeneous polymer melt contact with supercritical fluid from injection on every side at the machine barrel front end, under the promotion of injection screw, through static mixer, mixing refining head, self-locking nozzle, supercritical fluid dissolves in the polymer melt gradually, forms homogeneous system; This homogeneous system is injected foaming mould from the self-locking nozzle under the further promotion of injection screw; Homogeneous system begins to produce gas nuclear when leaving the self-locking nozzle, gas nuclear is grown up rapidly in mould.Injection is finished, and treats goods cooling die sinking taking-up goods, promptly finishes the production of micropore injection moulding goods.
The utility model has following advantage and effect with respect to prior art: utilize the utility model to realize supercritical fluid assistant micropore injection moulding on common injection machine, have advantages such as saving material, the rigidity/mass ratio that improves goods, non-environmental-pollution, the rigidity of the comparable not foaming product of micropore injection moulding goods/mass ratio improves 5～7 times.In addition because the utility model directly introduces common injection machine to supercritical fluid, on injection machine, increased mixing, from locking element, and can provide different self-lock forces by the replacing spring, be applicable to different process systems.Make the utility model have more compact conformation, energy consumption low, applied widely, be easy to realize, floor space is little, production cost is low advantage.Among the embodiment of the present utility model, the filling pressure of the comparable common injection moulding of filling pressure reduces about 60%; The comparable raising of not foaming about 12.8% of the impact strength of goods.Annular gas injection cover in the utility model can make supercritical fluid enter polymer melt equably, and the pressure loss in the time of simultaneously can reducing supercritical fluid again and enter melt makes that the input of supercritical fluid is more unobstructed.
Description of drawings
Fig. 1 is the equipment schematic diagram among the existing patent ZL 200320119112.6.
Fig. 2 is the equipment schematic diagram among existing patent US 6579910 B2.
Fig. 3 is the structural representation of the utility model supercritical fluid assistant micropore injection moulding apparatus.
Fig. 4 is the structural representation of the mixed milling type self-locking nozzle assembly of equipment shown in Figure 3.
Fig. 5 is the structural representation of gas injection flange shown in Figure 4.
Fig. 6 is the structural representation of annular gas injection cover shown in Figure 4.
Fig. 7 is a self-locking structure of nozzle schematic diagram shown in Figure 4.
Fig. 8 is the structural representation of mixing refining head shown in Figure 4.
Above-mentioned each number in the figure is described as follows: metering of A-supercritical fluid and conveying device; The B-injection machine; C-mixed milling type self-locking nozzle assembly; The D-mold system; The 1-temperature control system; The 2-high-pressure metering pump; The 3-high-pressure solenoid valve; The 4-check valve; 5-annular gas injection cover; The 6-hopper; The 7-machine barrel; The 8-screw rod; The 9-static mixer; The 10-mixing refining head; 11-self-locking nozzle (11-1-connector; Push rod behind the 11-2-; 11-3-torpedo body; Push rod before the 11-4-; The 11-5-nozzle cover; The 11-6-spring); The 12-injection mold; The 13-gas storage tank; The 14-valve; The 15-pressure sensor; The 16-pressure sensor; The 17-temperature sensor; The 18-temperature sensor; The 19-temperature sensor; 20-gas injection flange; The 21-thread bush; The 22-adapter sleeve.
The specific embodiment
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 thereto.
Embodiment
Fig. 3～Fig. 8 shows concrete structure of the present utility model, and as seen from Figure 3, this supercritical fluid assistant micropore injection moulding apparatus comprises injection machine B, mixed milling type self-locking nozzle assembly C, mold system D and supercritical fluid metering and conveying device A; Mixed milling type self-locking nozzle assembly C is connected by gas injection flange 20 with injection machine B, and described gas injection flange 20 is connected with conveying device A with the supercritical fluid metering simultaneously; Described injection machine B is common injection machine, comprise machine barrel 7, hopper 6, screw rod 8, the rear end of machine barrel 7 links to each other with hopper 6, machine barrel 7 be peripherally equipped with temperature control heating collar (not shown), machine barrel 7 inside are provided with the injection screw 8 that can be rotated with reciprocating.
The concrete structure of described mixed milling type self-locking nozzle assembly comprises static mixer 9, mixing refining head 10 (see figure 8)s, self-locking nozzle 11 as shown in Figure 4; At the front end of injection machine B, by gas injection flange 20 static mixer 9 is fixed on the front end of machine barrel 7, self-locking nozzle 11 is connected with static mixer 9 by thread bush 21, adapter sleeve 22, is provided with mixing refining head 10 in the porch of self-locking nozzle 11; The front and back of described static mixer 9 are equipped with pressure sensor 15,16 and temperature sensor 17,18.This mixed milling type self-locking nozzle assembly can be kept polymer/supercritical fluid homogeneous system under certain hyperbaric environment, produces the excellent pressure maintaining effect, and provides good immixture for it.
The structure of described self-locking nozzle 11 as shown in Figure 7, comprise connector 11-1, back push rod 11-2, torpedo body 11-3, preceding push rod 11-4, nozzle cover 11-5, spring 11-6, described connector 11-1 is arranged at the end that self-locking nozzle 11 is connected with static mixer 9, torpedo body 11-3 is arranged between connector 11-1 and the nozzle cover 11-5, axis at torpedo body 11-3 is provided with through hole, preceding push rod 11-4, spring 11-6 and back push rod 11-2 are arranged in the through hole, preceding push rod 11-4, back push rod 11-2 be arranged at respectively spring 11-6 two ends and with spring 11-6 apical grafting mutually, before the other end and the nozzle cover 11-5 apical grafting mutually of push rod 11-4, the jet hole of nozzle cover 11-5 is compressed sealing; The other end of back push rod 11-2 and connector 11-1 be apical grafting mutually, and the axially extending bore of connector 11-1 is compressed sealing.
The structure of described gas injection flange 20 is equipped with annular gas injection and overlaps 5 (see figure 6)s as shown in Figure 5 in gas injection flange 20; The outer surface of annular gas injection cover 5 has many crisscross grooves, even distribution aperture in these grooves, and inner surface then directly contacts with polymer melt.Supercritical fluid is by these aperture injection of polymer melts.
Described supercritical fluid metering and conveying device A comprise gas storage tank 13, valve 14, high-pressure metering pump 2, high-pressure solenoid valve 3, check valve 4, gas storage tank 13 is connected with high-pressure metering pump 2 by valve 14, and high-pressure metering pump 2 is connected with gas injection flange 20 by high-pressure solenoid valve 3 and check valve 4.Described high-pressure solenoid valve 3 can make the injection of gas and the injection process of melt realize interlock; Described check valve 4 can prevent that the polymer melt adverse current from entering gas pipeline; The pump housing of described high-pressure metering pump 2 is provided with temperature control system, can control the temperature of the supercritical fluid of the high-pressure metering pump of flowing through.
Described mold system D comprises injection mold 12, described injection mold 12 has temperature sensor 19, by finite element modelling, the runner and the cast gate of mould carried out special design, obtain a kind of running gate system that not only can reduce the mold filling resistance but also can make flow equilibrium.
The entire work process of this supercritical fluid assistant micropore injection moulding apparatus is: polymer beads adds from hopper 6, and polymer is through the heating of machine barrel 7, and the plasticizing of screw rod 8, conveying make its fusion and mixing even back arrive machine barrel 7 front ends; Injection machine B working stability is debugged and made to the temperature of control injection mold 12 to appropriate value under the situation of not injecting supercritical fluid.Open the valve 14 that is connected with gas storage tank 13, gas is entered have the high-pressure metering pump 2 of temperature control system; The temperature and pressure of control high-pressure metering pump 2 makes gas be in supercriticality; Set the outlet flow rate of high-pressure metering pump 2, when injection machine B start injection, open high-pressure solenoid valve 3 and make supercritical fluid enter annular gas injection cover 5 through check valve 4, gas injection flange 20 with constant compression force and flow; The polymer melt that flows forward fast in the injection drives from annular gas injection cover 5 supercritical fluids that enter and together passes through static mixer 9, mixing refining head 10, self-locking nozzle 11, makes it reach homogeneous system in self-locking nozzle 11; Under the continuation of screw rod 8 promoted, homogeneous system penetrated from self-locking nozzle 11 and begins nucleation; The melt of nucleation is injected into injection mold 12, and the abscess in the melt is grown up in injection mold 12, the melt typing that is cooled in injection mold 12 simultaneously; The micropore injection moulding goods are taken out in die sinking.
The foregoing description is the utility model preferred implementation; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.
Claims (6)
1, a kind of supercritical fluid assistant micropore injection moulding apparatus comprises injection machine, nozzle assembly, mold system and supercritical fluid metering and conveying device; It is characterized in that: described nozzle assembly is a mixed milling type self-locking nozzle assembly, and mixed milling type self-locking nozzle assembly is connected by the gas injection flange with injection machine, and described gas injection flange is connected with conveying device with the supercritical fluid metering.
2, supercritical fluid assistant micropore injection moulding apparatus according to claim 1, it is characterized in that: described mixed milling type self-locking nozzle assembly comprises static mixer, mixing refining head, self-locking nozzle, static mixer is connected with injection machine, the self-locking nozzle is connected with static mixer by adapter sleeve, is provided with mixing refining head in the porch of self-locking nozzle.
3, supercritical fluid assistant micropore injection moulding apparatus according to claim 2, it is characterized in that: described self-locking nozzle comprises connector, back push rod, the torpedo body, preceding push rod, nozzle cover, spring, described connector is arranged at the end that the self-locking nozzle is connected with static mixer, the torpedo body is arranged between connector and the nozzle cover, axis at the torpedo body is provided with through hole, preceding push rod, spring and back push rod are arranged in the through hole, preceding push rod, back push rod is arranged at both ends of the spring and spring apical grafting mutually respectively, before the other end and the nozzle cover apical grafting mutually of push rod, the jet hole of nozzle cover is compressed sealing; The other end of back push rod and connector be apical grafting mutually, and the axial hole of connector is compressed sealing.
4, supercritical fluid assistant micropore injection moulding apparatus according to claim 2 is characterized in that: the front and back of described static mixer are equipped with pressure sensor and temperature sensor.
5, supercritical fluid assistant micropore injection moulding apparatus according to claim 1 is characterized in that: annular gas injection cover is installed in the described gas injection flange; The outer surface of annular gas injection cover has many crisscross grooves, even distribution aperture in these grooves, and the inner surface of annular gas injection cover then directly contacts with polymer melt.These aperture injection of polymer melts that supercritical fluid puts by annular gas injection.
6, supercritical fluid assistant micropore injection moulding apparatus according to claim 1, it is characterized in that: described supercritical fluid metering and conveying device comprise gas storage tank, high-pressure metering pump, high-pressure solenoid valve, check valve, gas storage tank is connected with high-pressure metering pump, and high-pressure metering pump is connected with the gas injection flange by high-pressure solenoid valve and check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620064115 CN200939682Y (en) | 2006-09-11 | 2006-09-11 | Super-critical fluid auxilary micro-porous injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620064115 CN200939682Y (en) | 2006-09-11 | 2006-09-11 | Super-critical fluid auxilary micro-porous injection apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN200939682Y true CN200939682Y (en) | 2007-08-29 |
Family
ID=38745870
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620064115 Expired - Lifetime CN200939682Y (en) | 2006-09-11 | 2006-09-11 | Super-critical fluid auxilary micro-porous injection apparatus |
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|---|---|
| CN (1) | CN200939682Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450742C (en) * | 2006-09-11 | 2009-01-14 | 华南理工大学 | Supercritical fluid assistant micropore injection moulding apparatus |
| CN102343644A (en) * | 2011-07-13 | 2012-02-08 | 北京化工大学 | Gas-assisted surface microsphere structure injection molding method and mold |
| CN102962947A (en) * | 2012-12-05 | 2013-03-13 | 山东彼岸电力科技有限公司 | Novel glue injection gun head for die |
| CN103057059A (en) * | 2012-12-20 | 2013-04-24 | 华南理工大学 | Injection molding device and injection molding method of online mixing and preparing high-performance microcellular foaming plastic |
-
2006
- 2006-09-11 CN CN 200620064115 patent/CN200939682Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450742C (en) * | 2006-09-11 | 2009-01-14 | 华南理工大学 | Supercritical fluid assistant micropore injection moulding apparatus |
| CN102343644A (en) * | 2011-07-13 | 2012-02-08 | 北京化工大学 | Gas-assisted surface microsphere structure injection molding method and mold |
| CN102343644B (en) * | 2011-07-13 | 2013-07-24 | 北京化工大学 | Gas-assisted surface microsphere structure injection molding method and mold |
| CN102962947A (en) * | 2012-12-05 | 2013-03-13 | 山东彼岸电力科技有限公司 | Novel glue injection gun head for die |
| CN103057059A (en) * | 2012-12-20 | 2013-04-24 | 华南理工大学 | Injection molding device and injection molding method of online mixing and preparing high-performance microcellular foaming plastic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20060911 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |