CN101200108A - Fluid flow control system of gas foaming agent - Google Patents
Fluid flow control system of gas foaming agent Download PDFInfo
- Publication number
- CN101200108A CN101200108A CNA2006101473120A CN200610147312A CN101200108A CN 101200108 A CN101200108 A CN 101200108A CN A2006101473120 A CNA2006101473120 A CN A2006101473120A CN 200610147312 A CN200610147312 A CN 200610147312A CN 101200108 A CN101200108 A CN 101200108A
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve
- flow
- blowing agent
- foaming agent
- 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
Images
Abstract
The invention relates to a control system and control method for the flow of a gas foaming agent, in particular to a control system for the flow of the foaming agent when a physical gas foaming agent is adopted for the processing of thermoplastic foam. The control system of the flow of gas foaming agent described in the invention comprises a stop valve 1, a high pressure vessel 2, a pressure reducing valve 3, a proportional solenoid valve 4, a high voltage servo valve 7, an adjustable throttle valve 8, pressure sensors 9 and 10, a foaming agent temperature control module 11, a temperature sensor 12, a data processing and control module 5, an operation interface 6, pressure conduits connecting the above components, and communication wires or cables. The invention has the advantages that in accordance with the set flow and temperature value of the foaming agent injected into a processing device, with the system of the invention, a closed loop is adopted to control the flow and temperature of the flow agent. Therefore, the foaming agent flow required in the foaming process can be precisely and uniformly led into a polymer.
Description
Technical field
The present invention relates to a kind of control system and control method of gas foaming agent flux, when relating more specifically to adopt gas physical blowing agent processing thermoplastic foamed plastics to the control system of blowing agent flow.
Background technology
Or because the needs of structure, or because the needs of function such as heat insulation, sound insulation etc., or, use the thermoplastic plastic foaming moulded products more and more for the purpose of the cost that saves material.When foaming, as extrude, inject or other molding mode, a kind of known method is that employing CBA and thermoplastic resin are mixing, and strict control technological parameter.Yet when using CBA, require technology controlling and process very strict on the one hand, exist on the other hand the blowing agent residue is arranged in the goods, mould corrosion and goods are follow-up is subjected to the restriction of environmental requirement when using, therefore the molded merchant of foaming product tends to the using gases physical blowing agent more and more, particularly online with the inert gas blown agent, be introduced directly into as nitrogen, carbon dioxide etc. among the molten thermoplastic resin of extruder, form uniform expandable thermoplastic resin compound, moulding then through mixing.Yet add man-hour adopting physical blowing agent to foam, the implantation dosage of blowing agent and stability thereof directly have influence on the quality stability of foaming product.
When known employing gas physical blowing agent processing foamed product, method commonly used is that foaming agent gas is directly added with pressure-reducing valve from gas bomb or after boosting to certain pressure.When adopting this kind method, the pressure oscillation meeting of the molten resin in the processing unit (plant) causes the changes in flow rate that is injected in the processing unit (plant), even when being higher than gas pressure, the pressure of molten polymer can not inject blowing agent, the dosage injection rate that can cause like this foaming is inhomogeneous, thereby causes the quality instability of foaming product.As the Chinese patent literature publication number is among the CN1102490C, disclosed the method for implanting of a kind of supercritical carbon dioxide as blowing agent, this method has solved some problems of injecting the liquid carbon dioxide blowing agent, yet the document does not disclose the metering and the injection problem of gaseous carbon dioxide blowing agent, and does not disclose fluctuation problem that is injected into blowing agent flow in the polymer that causes when solving the polymer melt pressure oscillation and the unsettled method of being carried by the blowing agent that the fluctuation of pumping gap causes yet.In addition, the Chinese patent literature publication number is a kind of blowing agent metering system and the method for having proposed in the CN1446145A file, and the control method that embodies in the document is the pressure that relation that adopt to measure the pressure differential at fixed orifice two ends and pressure reduction and flow velocity is regulated the throttle orifice front end.Yet when adopting this method, on the one hand, the relation of pressure reduction and flow is not a linear relationship, and only considering to change pressure reduction is to be difficult to accurately control flow; On the other hand, fixing throttle orifice only can be at a narrow scope inner control flow, after exceeding this scope, and the flow measurement instability, the disclosed technology of this patent application obviously has limitation in application facet.
Summary of the invention
The present invention seeks to problem according to above-mentioned the deficiencies in the prior art and existence, by simultaneously output flow and output temperature being carried out closed-loop control, can guarantee when melt pressure significantly changes, to keep flow fully stable, by regulating and the locking choke valve, accurately control the flow of output in realizing on a large scale, for stable control foaming dosage and stable control foaming product quality provide a kind of solution.
The object of the invention realizes being finished by following technical scheme:
A kind of fluid flow control system of gas foaming agent of the present invention, comprise by inlet shutoff valve 1, high-pressure bottle 2, pressure-reducing valve 3, electromagnetic proportional valve 4, high pressure servo valve 7, adjustable joint choke valve 8, pressure sensor 9 and 10, blowing agent temperature control module 11, temperature sensor 12, data processing and control module 5, operation interface 6, and the pressure pipeline and communication wire or the cable composition that connect above-mentioned parts; Wherein inlet shutoff valve 1, high-pressure bottle 2, high pressure servo valve 7, adjustable joint choke valve 8, blowing agent temperature control module 11 is connected in series with pressure pipeline in order, on the pipeline between high pressure servo valve 7 and the adjustable joint choke valve 8, pressure sensor 9 is set, and between adjustable joint choke valve 8 and blowing agent temperature control module 11, pressure sensor 10 is set, in blowing agent exit a temperature sensor 12 is set near blowing agent temperature control module 11, wherein pressure-reducing valve 3 is connected with electromagnetic proportional valve 4, the outlet of electromagnetic proportional valve 4 is connected with the pilot gas interface of high pressure servo valve 7, and the import of pressure-reducing valve 3 is connected with pressed gas.
Advantage of the present invention is, this system of the present invention can be used for according to blowing agent flow and the temperature value to the processing unit (plant) injection set, adopt the flow and the temperature of closed-loop control foaming agent gas, accurately and equably that foam process is required blowing agent flow is introduced in the polymer.
Description of drawings
Accompanying drawing 1 is system architecture schematic diagram of the present invention;
Accompanying drawing 2 is user mode schematic diagram of the present invention.
The specific embodiment
Feature of the present invention and correlated characteristic thereof are described further by embodiment below in conjunction with accompanying drawing:
Show as accompanying drawing 1,2, wherein label 1-17 represents respectively, 1-stop valve, 2-high-pressure bottle, 3-pressure-reducing valve, 4-electromagnetic proportional valve stop valve, the processing of 5-data and control module, 6-operation interface, 7-high pressure servo valve, 8-is adjustable joint choke valve, 9 and 10-pressure sensor, 11-blowing agent temperature control module, 12-temperature sensor, 13-high-pressure air source, the machine barrel of 14-process of resin device, 15-blowing agent intake, 16-screw rod, 17-hybrid element.
Show as accompanying drawing 1,2, system of the present invention comprises by inlet shutoff valve 1, high-pressure bottle 2, pressure-reducing valve 3, electromagnetic proportional valve 4, high pressure servo valve 7, adjustable joint choke valve 8, pressure sensor 9 and 10, blowing agent temperature control module 11, temperature sensor 12, data processing and control module 5, operation interface 6, and the pressure pipeline and communication wire or the cable composition that connect above-mentioned parts; Wherein inlet shutoff valve 1, high-pressure bottle 2, high pressure servo valve 7, adjustable joint choke valve 8, blowing agent temperature control module 11 is connected in series with pressure pipeline in order, on the pipeline between high pressure servo valve 7 and the adjustable joint choke valve 8, pressure sensor 9 is set, and between adjustable joint choke valve 8 and blowing agent temperature control module 11, pressure sensor 10 is set, in blowing agent exit a temperature sensor 12 is set near blowing agent temperature control module 11, wherein pressure-reducing valve 3 is connected with electromagnetic proportional valve 4, the outlet of electromagnetic proportional valve 4 is connected with the pilot gas interface of high pressure servo valve 7, and the import of pressure-reducing valve 3 is connected with pressed gas.The control of whole system and operation are handled by data and control device 5 and operation interface 6 carry out.Wherein data processing and control device 5 comprise input port and delivery outlet, its input port is by cable or electric wire and operation interface 6, pressure sensor 9 and 10, temperature sensor 12 control connections reception operational order and pressure and temperature signal, and/or reception is from the signal of make-up machine; Its delivery outlet is connected the output function instruction with electromagnetic proportional valve 4, blowing agent temperature control module 11.
Control method of the present invention is meant and comprises a kind of closed-loop control blowing agent flow and method of temperature that blowing agent temperature closed loop control wherein is by blowing agent attemperating unit 11 and temperature sensor 12, what data were handled and control device 5 is realized.According to technological requirement, determine blowing agent proper temperature and by operation interface 6 be input to that data are handled and control device 5 in, after the blowing agent temperature that data are handled and control device 5 records according to temperature sensor 12 is handled through PID then, issue instructions to that blowing agent attemperating unit 11 heats or temperature control, make the temperature of output blowing agent fully be stabilized in design temperature.The flow control methods that provides of the present invention has taken into full account the blowing agent temperature, effectively throttle diameter, absolute pressure, pressure variation etc. are carried out closed-loop control to the influence of flow to output flow.According to the range of flow of output with throttle valve adjustment and be locked in a position, then with the system-computed coefficient that calibrates and by operation interface 6, the input data handle and control device 5 in, and input simultaneously blowing agent temperature value and the flow value expected.System of the present invention will carry out closed-loop control to the blowing agent temperature automatically, make the blowing agent temperature fully be stabilized in set temperature value.Data handle and control module 5 according to pressure sensor 9 and the 10 actual pressure that record, the temperature sensor 12 actual temperature that record, calculating actual flow, and the expectation flow value of actual flow value and setting compared.Data processing and control module 5 calculate the output pressure (being the pressure that sensor 9 is surveyed) of high pressure servo valve 7 according to the flow value difference, and regulate the pressure of pilot gas to the electromagnetic proportional valve 4 in the pilot gas control assembly of high pressure servo valve 7, and then the output pressure of control high pressure servo valve 7 by its delivery outlet output order.Thereby make output flow fully be stabilized in the output flow value of setting through relatively adjusting repeatedly.
Show as Fig. 2, use when of the present invention, blowing agent intake 15 is arranged on the machine barrel 14 that its position is positioned at the melten gel metering of screw rod and a position of homogenize section; Intake can be one, also can be a plurality of.When adopting a plurality of intake, intake can evenly distribute along the circumferencial direction of machine barrel 14.The blowing agent range of flow of required introducing when at first when not producing expanded material, producing the ability of molten resin and producing foaming product according to expandable thermoplastic resins system, as mass flow or volume flow, for example per minute or the per hour volume flow of injection, regulate adjustable joint choke valve 8 at a correct position, make system can in the range of flow of expection, realize accurate flow measurement.Lock choke valve 8, calibrate the design factor of system then.And this design factor is input to by operation interface 6 that data are handled and the flow rate calculation and control program of control module 5 in.The one or more blowing agent intakes 15 that then flow of the present invention and control pressurer system are connected with high-pressure air source 13 on the machine barrel 14 with the process of resin device are connected.Inlet shutoff valve 1 is opened, and the gases at high pressure blowing agent is introduced into a high-pressure bottle 2.Be introduced into blowing agent flow and blowing agent temperature in the thermoplastic resin in the machine barrel by operation interface 6 input.Start expandable thermoplastic resins system, wait for that the temperature of blowing agent arrives the temperature of setting, system just can on demand flow and temperature accurately introduce blowing agent reposefully in thermoplastic resin.In the preparation process of expandable thermoplastic resin, screw rod 16 is in motion in machine barrel 14 under the driving of power.Have in thermoplastic melt on the machine barrel 14 in the metering of stabilized quality flow velocity and certain pressure and homogenize district and offer one or more blowing agent intakes 15, blowing agent flow in the molten resin by intake 15.By hybrid element 17 Forced Mixing that blowing agent freely spreads and process is installed screw front end, blowing agent is in even admixture at molten resin.Because mixture is under the pressure state always, gas foaming agent wherein is unlikely to grow up.When blowing agent flow export mould or nozzle, molten resin/blowing agent blends can nucleation/foaming.
If according to the needs of arts demand and goods, when needing to adjust the blowing agent flow that injects, can import the flow value that needs by operation interface 6.System can regulate and the stable blowing agent flow that is injected in the molten resin automatically, finishes the blowing agent injection of regulation flow and introduces.
Further exemplify and be described as follows:
As blowing agent, adopt polypropylene (PP) to produce the foam sheet of 3 millimeters thick with industrial nitrogen.Be 100 millimeters extruder plasticizing and mixed foaming agent and prepare the molten resin mixture that to foam with a screw diameter.Adopting diaphragm type compressor that industrial nitrogen is boosted to 300 clings to and is stored in the pressure pan as the blowing agent source.Adopt blowing agent flow control system of the present invention that high-pressure foam agent source is connected with extruder barrel.Circumferencial direction from the position of the about 15D of charging aperture on extruder barrel is evenly offered 3 blowing agent intakes, by 120 ° of distributions.Pass through connector (as air tube) respectively at 3 blowing agent intakes, and be connected with the delivery outlet of blowing agent flow control system.Form the preparation system of the molten thermoplastic resin's homogeneous mixture that can foam like this.According to the nitrogen flow scope of producing the required interpolation of expanded material, as the range of flow that per minute 10-100 standard rises, choke valve to a position in the regulating system and locking, the design factor of calibration system also is input in the blowing agent flow control system.When producing, according to actual needs, with the flow set of blowing agent be earlier 50 marks rise/minute, the blowing agent temperature is set at 30 ℃.When the blowing agent temperature of control system outlet reaches default 30 ℃, but synchronous operation extruder and blowing agent flow control system.According to the foaming effect of actual extruded product, can further accurately adjust the blowing agent flow of setting, reach the foam structure and the loss of weight of expection.In actual production, when the foaming dosage gas injection of adopting per minute 20 standards to rise is extruded, obtain the foam sheet that proportion is approximately 0.6 gram/cubic centimetre; When the foaming dosage gas injection of per minute 40 standards liter is extruded, obtain the foam sheet that proportion is approximately 0.5 gram/cubic centimetre.In actual production process, though the melten gel pressure that records is fluctuating at any time, the foam sheet of extruding has uniform foam structure and sheet material proportion.This illustrates that blowing agent flow control system of the present invention has realized automated closed-loop control flow, can realize fully-automatic production.
Though below design and embodiment according to the object of the invention have been done to elaborate with reference to accompanying drawing; but those of ordinary skills can recognize; under the precondition that does not break away from the claim limited range; still can make various improvement and conversion to the present invention, and this improvement and conversion still should belong to protection scope of the present invention.
Claims (1)
1. fluid flow control system of gas foaming agent, it is characterized in that, by inlet shutoff valve (1), high-pressure bottle (2), pressure-reducing valve (3), electromagnetic proportional valve (4), high pressure servo valve (7), adjustable joint choke valve (8), pressure sensor (9) and (10), blowing agent temperature control module (11), temperature sensor (12), data are handled and control module (5), operation interface (6), and the pressure pipeline and communication wire or the cable composition that connect above-mentioned parts, wherein, inlet shutoff valve 1, high-pressure bottle (2), high pressure servo valve (7), adjustable joint choke valve (8), blowing agent temperature control module (11) is connected in series with pressure pipeline in order, on the pipeline between high pressure servo valve (7) and the adjustable joint choke valve (8), pressure sensor (9) is set, and between adjustable joint choke valve (8) and blowing agent temperature control module (11), pressure sensor (10) is set, in blowing agent exit a temperature sensor (12) is set near blowing agent temperature control module (11), wherein, pressure-reducing valve (3) is connected with electromagnetic proportional valve (4), the outlet of electromagnetic proportional valve (4) is connected with the pilot gas interface of high pressure servo valve (7), and the import of pressure-reducing valve (3) is connected with pressed gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101473120A CN101200108B (en) | 2006-12-15 | 2006-12-15 | Fluid flow control system of gas foaming agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101473120A CN101200108B (en) | 2006-12-15 | 2006-12-15 | Fluid flow control system of gas foaming agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101200108A true CN101200108A (en) | 2008-06-18 |
| CN101200108B CN101200108B (en) | 2011-01-26 |
Family
ID=39515555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101473120A Active CN101200108B (en) | 2006-12-15 | 2006-12-15 | Fluid flow control system of gas foaming agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101200108B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830049A (en) * | 2010-06-17 | 2010-09-15 | 北京中拓机械有限责任公司 | Metering system for supercritical fluid foaming agent |
| CN102229241A (en) * | 2011-06-03 | 2011-11-02 | 河北亚大汽车塑料制品有限公司 | Device and method for steam molding of thermoplastic pipe |
| CN102310515A (en) * | 2011-06-02 | 2012-01-11 | 中国科学院宁波材料技术与工程研究所 | Constant-pressure constant-flow injection device of micro-flow high-pressure liquefied gas |
| CN101653977B (en) * | 2009-08-31 | 2013-03-13 | 北京中拓机械有限责任公司 | Metering device of supercritical fluid foaming agent |
| CN103538199A (en) * | 2013-09-22 | 2014-01-29 | 安徽华宝建材有限公司 | Polystyrene pre-foaming and curing system |
| CN104006036A (en) * | 2014-06-05 | 2014-08-27 | 北京航空航天大学 | Design of high-pressure electrical proportional pressure regulating system |
| CN106568484A (en) * | 2016-11-02 | 2017-04-19 | 北京控制工程研究所 | Self-controlled flow test device |
| CN107339092A (en) * | 2017-08-07 | 2017-11-10 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification(UCG) monitoring system |
| TWI682844B (en) * | 2018-01-31 | 2020-01-21 | 蘇榮華 | Pressure supply system for plastic extrusion gas foaming |
| CN110873286A (en) * | 2019-11-21 | 2020-03-10 | 西安交通大学 | Multiple air source supply device for high-pressure large-flow gas experiment |
| CN111734534A (en) * | 2020-06-11 | 2020-10-02 | 上海尚实能源科技有限公司 | Engine fuel supply flow control system and control method thereof |
| CN112786223A (en) * | 2021-01-14 | 2021-05-11 | 中广核研究院有限公司 | Flow stabilizing device, waste heat discharge system and flow stabilizing method |
| CN113608557A (en) * | 2021-08-04 | 2021-11-05 | 长虹美菱股份有限公司 | Sectional type control system and method for foaming injection flow |
| CN115091682A (en) * | 2022-06-22 | 2022-09-23 | 周辰 | Refrigerator body foaming manufacturing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7144532B2 (en) * | 2002-10-28 | 2006-12-05 | Trexel, Inc. | Blowing agent introduction systems and methods |
| CN200981323Y (en) * | 2006-12-15 | 2007-11-28 | 北京中拓机械有限责任公司 | Gas foaming agent flow quantity controlling system |
-
2006
- 2006-12-15 CN CN2006101473120A patent/CN101200108B/en active Active
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101653977B (en) * | 2009-08-31 | 2013-03-13 | 北京中拓机械有限责任公司 | Metering device of supercritical fluid foaming agent |
| CN101830049A (en) * | 2010-06-17 | 2010-09-15 | 北京中拓机械有限责任公司 | Metering system for supercritical fluid foaming agent |
| CN102310515A (en) * | 2011-06-02 | 2012-01-11 | 中国科学院宁波材料技术与工程研究所 | Constant-pressure constant-flow injection device of micro-flow high-pressure liquefied gas |
| CN102229241A (en) * | 2011-06-03 | 2011-11-02 | 河北亚大汽车塑料制品有限公司 | Device and method for steam molding of thermoplastic pipe |
| CN102229241B (en) * | 2011-06-03 | 2013-07-17 | 河北亚大汽车塑料制品有限公司 | Device and method for steam molding of thermoplastic pipe |
| CN103538199A (en) * | 2013-09-22 | 2014-01-29 | 安徽华宝建材有限公司 | Polystyrene pre-foaming and curing system |
| CN103538199B (en) * | 2013-09-22 | 2016-02-24 | 合肥超威光电科技有限公司 | Polystyrene sends out aging system in advance |
| CN104006036A (en) * | 2014-06-05 | 2014-08-27 | 北京航空航天大学 | Design of high-pressure electrical proportional pressure regulating system |
| CN106568484A (en) * | 2016-11-02 | 2017-04-19 | 北京控制工程研究所 | Self-controlled flow test device |
| CN107339092A (en) * | 2017-08-07 | 2017-11-10 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification(UCG) monitoring system |
| TWI682844B (en) * | 2018-01-31 | 2020-01-21 | 蘇榮華 | Pressure supply system for plastic extrusion gas foaming |
| CN110873286A (en) * | 2019-11-21 | 2020-03-10 | 西安交通大学 | Multiple air source supply device for high-pressure large-flow gas experiment |
| CN111734534A (en) * | 2020-06-11 | 2020-10-02 | 上海尚实能源科技有限公司 | Engine fuel supply flow control system and control method thereof |
| CN112786223A (en) * | 2021-01-14 | 2021-05-11 | 中广核研究院有限公司 | Flow stabilizing device, waste heat discharge system and flow stabilizing method |
| WO2022151765A1 (en) * | 2021-01-14 | 2022-07-21 | 中广核研究院有限公司 | Flow control device, waste heat discharge system, and flow stabilization method |
| CN112786223B (en) * | 2021-01-14 | 2023-10-31 | 中广核研究院有限公司 | Waste heat discharging system and flow stabilizing method |
| CN113608557A (en) * | 2021-08-04 | 2021-11-05 | 长虹美菱股份有限公司 | Sectional type control system and method for foaming injection flow |
| CN115091682A (en) * | 2022-06-22 | 2022-09-23 | 周辰 | Refrigerator body foaming manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101200108B (en) | 2011-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101200108B (en) | Fluid flow control system of gas foaming agent | |
| CN101480831A (en) | Supercritical fluid aerating powder conveying device and control method | |
| CN200981323Y (en) | Gas foaming agent flow quantity controlling system | |
| CN1446145A (en) | Blowing agent metering system and method | |
| CN100532057C (en) | Blowing agent introduction systems and methods | |
| EP0654300B1 (en) | Method for blending a gas into a high viscosity liquid | |
| US4252844A (en) | Process for mixing liquid additives with solid materials under sonic velocity conditions | |
| KR20110021912A (en) | Multi-stage accurate blending system and method | |
| CN109056082B (en) | Single-part uniform and quantitative injection method for melt direct spinning functional master batch | |
| CN104273646B (en) | Even feeding spraying humidification moisture control subsystem | |
| CN104723490A (en) | Intermittent micro-foaming injection molding equipment and intermittent micro-foaming injection molding process | |
| JP2021500258A (en) | Introduction of foaming agents into polymer foam processes | |
| CN101612773B (en) | Discontinuous foaming agent control lead-in system and method | |
| CN101554771B (en) | Device for preparing polymer | |
| CN100475331C (en) | Method and apparatus for controlling temperature of reactor | |
| CN201338361Y (en) | Supercritical fluid foaming agent conveying device | |
| CN204487925U (en) | A kind of batch (-type) micro foaming injection moulding equipment | |
| CN101830049A (en) | Metering system for supercritical fluid foaming agent | |
| WO2002081556A1 (en) | Method and apparatus for controlling foam processing | |
| CN201471668U (en) | Supercritical fluid foaming agent dosage control device | |
| CN102183976A (en) | Device and method for automatic control over mold temperature | |
| CN109774085B (en) | Pressure and temperature control device for mold cavity | |
| CN101653977B (en) | Metering device of supercritical fluid foaming agent | |
| CN101653978B (en) | Metering system of supercritical fluid foaming agent | |
| CZ32594A3 (en) | Process for producing extruded plastic foams |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING CHN-TOP MACHINERY GROUP CO., LTD. Free format text: FORMER NAME: BEIJING CHN-TOP MACHINERY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 102208 Beijing, Huilongguan, Beijing, Changping District Billiton machinery Refco Group Ltd Patentee after: Co., Ltd of mechanical group is opened up in Beijing Address before: 102208 Beijing, Huilongguan, Beijing, China Billiton Machinery Co., Ltd. Patentee before: Beijing Chn-Top Machinery Co., Ltd. |