CN201721042U - Forming device of injected plastic extrusion microchannel of physical foaming agent - Google Patents

Forming device of injected plastic extrusion microchannel of physical foaming agent Download PDF

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Publication number
CN201721042U
CN201721042U CN2010202652736U CN201020265273U CN201721042U CN 201721042 U CN201721042 U CN 201721042U CN 2010202652736 U CN2010202652736 U CN 2010202652736U CN 201020265273 U CN201020265273 U CN 201020265273U CN 201721042 U CN201721042 U CN 201721042U
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China
Prior art keywords
pressure
motor
foaming agent
supply system
minoxidil
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Expired - Fee Related
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CN2010202652736U
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Chinese (zh)
Inventor
许忠斌
曹佳培
彭懋
蔡娥
贺世正
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ZHEJIANG HUATAI PLASTIC CO Ltd
Zhejiang University ZJU
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ZHEJIANG HUATAI PLASTIC CO Ltd
Zhejiang University ZJU
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Priority to CN2010202652736U priority Critical patent/CN201721042U/en
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    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/924—Barrel or housing
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/92409—Die; Nozzle zone
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

Abstract

The utility model discloses a forming device of an injected plastic extrusion microchannel of a physical foaming agent. The device comprises a motor, an extruder, a gear pump, a heating ring, a machine head, an opening die, a heater, a compressed air supply system, a cooling gas nozzle, a cooling roller, a low-speed step-down forming die, a supply system of a foaming agent, a pressure sensor, a temperature sensor and an electric valve. The utility model has wide application range, high degree of automation and high forming quality of a plastic microchannel and is simple to operate.

Description

A kind of physical foaming agent injected plastic extruded microchannel molding device
Technical field
The utility model relates to employing plastic extruding forming process technology, relates in particular to a kind of physical foaming agent injected plastic extruded microchannel molding device.
Background technology
In the prior art, the method of plastic extruding forming minor diameter hollow channel generally is by in the extruder draught animals mould core body being installed, perhaps feed Compressed Gas to plastics extrudate inside by hollow core, and make the passage internal diameter diminish to further stretching of extrudate, the final molding smaller diameter passage.As the processing of hollow plastic products such as medical microtubule, doughnut, the minimum diameter that these plastic products can reach is generally the hundreds of micron.Traditional method is difficult to the hollow channel diameter is further reduced significantly.This is because these class methods have the following disadvantages: at first by the external diameter decision of core body end, the core body end is generally obtained by machining (1) hollow channel internal diameter, and external diameter minimum usually is the hundreds of micron.This has just limited dwindling of hollow channel plastic products internal diameter; (2) the hollow channel plastic products are extruded the main stretching means that adopt in back, reach the purpose that its internal diameter is further dwindled.This just is subjected to the restriction of plastic melt tensile elongation, and its effect is very limited; And for nonaxisymmetrical hollow channel plastics, extensibility is excessive, and the hollow channel internal diameter becomes flat, and circularity descends obviously.Therefore, traditional processing technology is difficult to realize that the hollow channel internal diameter is contracted to micron even nanoscale under the prerequisite that guarantees hollow channel circularity quality.
The utility model content
The utility model purpose is at the deficiencies in the prior art, and a kind of physical foaming agent injected plastic extruded microchannel molding device is provided, the utility model novelty, simple to operate, product quality is high, be easy to safeguard.
The purpose of this utility model is achieved through the following technical solutions: a kind of physical foaming agent injected plastic extruded microchannel molding device, it comprises with lower member: motor, extruder, gear pump, heating collar, head and mouthful mould, heater, compressed air supply system, refrigerating gas nozzle, chill roll, Minoxidil pattern, blowing agent supply system, pressure sensor P1～4, temperature sensor T1～7, motor-driven valve M1～4 at a slow speed.Wherein, the screw rod in the rotating shaft of motor and the extruder connects by shaft coupling; Extruder, gear pump, head and mouthful mould and at a slow speed the Minoxidil pattern connect by flange successively; Two refrigerating gas nozzles are arranged in plastics up and down and extrude the part and the junction of Minoxidil pattern at a slow speed, extrude part a pair of chill roll is installed up and down, and the blowing agent supply system links to each other with a head and a mouthful mould by pipeline.
Further, a described head and a mouthful mould comprise: head connector, core body, runner transition body, mouthful mould, outer modular ring; Wherein, described head connector and runner transition sports association connect; The mouth mould is placed in the opening of runner transition body, by the outer modular ring that is threaded in the opening mouth mould is fixed, and core body is located on the head connector, and the core body syringe needle on the core body is equal with mouthful mould exit face.
Further, core body links to each other by pipeline with the blowing agent supply system, and pressure sensor P1 and motor-driven valve M1 are arranged on the pipeline; Setting pressure and temperature sensor in the Minoxidil pattern are connected with the compressed air supply line by the air-flow adapter at a slow speed, and heater, temperature sensor T5 and T6, pressure sensor P2, motor-driven valve M2 and M4 are installed on the supply line; Two refrigerating gas nozzles are connected by pipeline with compressed air supply system, and pressure sensor P3 and motor-driven valve M3 are arranged on the pipeline.
Further, the described pattern of Minoxidil at a slow speed comprises: air-flow adapter, pressure and temperature sensor, typing die body.Wherein, described air-flow adapter and pressure and temperature sensor are arranged on the typing die body.
The beneficial effects of the utility model are:
1, the plastic products that physical foaming agent injected plastic extruded microchannel molding device of the present utility model can extrusion molding micron order (0.1-100 μ m) internal channel, and, because blowing agent evenly spreads to plastic melt around channel center's axle, foamed zones evenly distributes, the microchannel circularity height of final molding;
What 2, stock mould can the conveniently regulating and controlling physical blowing agent is partly dissolved and foaming, thereby controls the diameter of required microchannel;
3, extrusion pressure control system, stock mould temperature field and pressure field regulator control system, blowing agent supply system are all passed through its pressure of FEEDBACK CONTROL, flow and temperature, and stability is high, easy operating, and labour intensity is little.
Description of drawings
Fig. 1 is a physical foaming agent injected plastic extruded microchannel formation system general assembly schematic diagram;
Fig. 2 is a physical foaming agent injected plastic extruded microchannel former structural representation;
Fig. 3 is a physical foaming agent injected plastic extruded microchannel forming method schematic diagram;
Fig. 4 is an extrusion pressure feedback control loop structured flowchart.
Among the figure: motor 1; extruder 2; extrusion pressure FEEDBACK CONTROL 3; gear pump 4; heating collar 5; head and mouthful mould 6; stock mould temperature FEEDBACK CONTROL 7; stock mould pressure feedback control 8; heater 9; compressed air supply system 10; refrigerating gas pressure feedback control 11; refrigerating gas nozzle 12; extrude part 13; chill roll 14; the Minoxidil pattern 15 at a slow speed; blowing agent pressure feedback control 16; blowing agent supply system 17; head connector 18; core body 19; runner transition body 20; mouth mould 21; outer modular ring 22; core body syringe needle 23; air-flow takes over 24; pressure and temperature sensor 25; typing die body 26; plastic melt 27; blowing agent-plastic melt Mixed Zone 28; blowing agent 29; foamed plastic zone 30; pressure sensor P1～4; temperature sensor T1～7; motor-driven valve M1～4.
The specific embodiment
Principle of the present utility model is: at first utilize selected plastics physical blowing agent (as chloro-fluoro-carbon kind physical blowing agent, supercritical CO 2Deng) can be dissolved in the characteristic of plastic melt, the dissolving fast under the pressure effect in shaping mould of the physical blowing agent of channel interior makes that not the passage of moulding dwindles gradually fully; Secondly, the physical blowing agent that utilizes dissolving is when pressure, temperature change fast, and nucleation is separated out small abscess, forms certain expansion, and the extruded hollow passage further dwindles, and finally realizes the moulding of microchannel.The flow of pressure field in physical blowing agent flux that injects by control and pressure, the shaping mould and temperature field, stock mould outlet cooling blast is regulated the diameter of microchannel in the needed plastics.
The utility model is applicable to produces the inner plastic extrusion products that needs small circular hollow channel, and for example, doughnut, micro medical conduit, multiple microchannels profile shapes are realized hollow channel micron order even nanoscale.The microchannel plastic products that the method processing that the utility model provides obtains can also be applied in the micromachine products such as microreactor, micro-mixer, micro heat exchanger.
The forming principle of microchannel is the microcellular foam forming method to be extruded the internal channel forming method with general plastics combine.Detailed process be with plastic raw materials through spiro rod plasticizing, evenly extrude after, blowing agent supply system supply physical blowing agent is by the syringe needle injected plastic melt on the hollow core, first one-step forming millimeter level hollow channel.Physical blowing agent is dissolved in plastic melt gradually in Minoxidil pattern at a slow speed, and internal diameter dwindles gradually; When leaving stock mould, under the quick cooling effect of abrupt pressure reduction, outside low temperature Compressed Gas, the rapid nucleation foaming of the blowing agent that has dissolved, further channel wall is dwindled in extruding.In the process of extruding, be subjected to drawing the stretching action of stretching device simultaneously.Different with existing passage aisle forming method is: (1) extrusion combines microcellular foam foaming principle, and it is different with general core body method extrusion molding; (2) channel diameter of moulding is littler, can reach micron order (0.1-100 μ m), and the circularity height in cross section, microchannel; (3) stock mould of employing particular design, temperature and pressure field in the control stock mould, the dissolution degree and the foaming process of regulation and control blowing agent.The utility model has been realized the new method of small, the high circularity plastic of conduit of extrusion molding, and is applied widely, and the automaticity height is simple to operate, plastics microchannel Forming Quality height.
As shown in Figure 1, the utility model physical foaming agent injected plastic extruded microchannel molding device comprises with lower member: motor 1, extruder 2, gear pump 4, heating collar 5, head and mouthful mould 6, heater 9, refrigerating gas nozzle 12, chill roll 14, Minoxidil pattern 15, blowing agent supply system 17, pressure sensor P1～4, temperature sensor T1～7, motor-driven valve M1～4 at a slow speed.
The annexation of each parts of physical foaming agent injected plastic extruded microchannel molding device and position relation is as follows: the rotating shaft of motor 1 and extruder 2 interior screw rods connect by shaft coupling; Core body 19 is located on head connector 18, core body syringe needle 23 on the core body 19 is equal with mouthful mould 21 exit faces, again runner transition body 20 is passed through Bolt Connection behind the location, mouth mould 21 is put into the opening of runner transition body 20, it is fixing with mouth mould 21 to screw in outer modular ring 22, finishes the installation of head and mouthful mould 6; Core body syringe needle 23 external diameter 0.4mm are arranged on the core body 19, and internal diameter 0.2mm behind the location, hole by spark machined, is connected syringe needle by copper brazing again with the core body main body, and the end of syringe needle is equal with mouthful mould end; Extruder 2, gear pump 4, head and mouthful mould 6 and at a slow speed Minoxidil pattern 15 connect by flange successively; Core body 19 links to each other with the pipeline of external world's supply blowing agent, and pressure sensor P1 and motor-driven valve M1 are arranged on the pipeline; Setting pressure and temperature sensors 25 in the Minoxidil pattern 15 at a slow speed, take over 24 by air-flow and be connected, heater 9, temperature sensor T5 and T6, pressure sensor P2, motor-driven valve M2 and M4 are installed on the supply line with the compressed air supply line of uniform temperature and pressure; Two refrigerating gas nozzles 12 are arranged in plastics up and down and extrude part 13 and leave the exit of Minoxidil pattern 15 at a slow speed, are connected by pipeline with compressed air supply system 10, and pressure sensor P3 and motor-driven valve M3 are arranged on the pipeline; Corresponding plastics are extruded on the position of a segment distance of part 13 outlets, and a pair of chill roll 14 is installed; According to the characteristic of extruding part, determine draw-gear after the chill roll 14,, hauling machine is installed is batched as extruding part for film.The outside of the machine barrel of extruder 2, gear pump 4 discharge connections and mouthful mould 21 coats heating collar and is used for heating, simultaneously the outer mounting temperature sensor T1 of heating collar～4.
As shown in Figure 2, a head and a mouthful mould 6 comprise parts: head connector 18, core body 19, runner transition body 20, mouthful mould 21, outer modular ring 22.The annexation of each parts is: head connector 18 and runner transition body 20 are by flange bolt connection, plain cushion sealing; Mouth mould 21 is placed in the opening of runner transition body 20, by the outer modular ring 22 that is threaded in the opening mouth mould 21 is fixed.
As shown in Figure 2, Minoxidil pattern 15 comprises parts at a slow speed: air-flow adapter 24, pressure and temperature sensor 25, typing die body 26.The annexation of each parts is: typing die body 26 circumference etc. are four holes separately, the hole machining internal thread, air-flow takes over 24 will finalize the design by thread connection that die body 26 is interior to communicate with compressed gas source, and pressure and temperature sensor 25 are fixed by thread connection at diverse location as shown in the figure.
As shown in Figure 1, the control loop of physical foaming agent injected plastic extruded microchannel molding device comprises: extrusion pressure FEEDBACK CONTROL 3, stock mould temperature FEEDBACK CONTROL 7, stock mould pressure feedback control 8, refrigerating gas pressure feedback control 11, blowing agent pressure feedback control 16.Control loop all passes through FEEDBACK CONTROL, and control principle is identical, is example explanation control loop building block and operation principle with extrusion pressure FEEDBACK CONTROL 3 hereinafter.
As shown in Figure 4, the composition of extrusion pressure FEEDBACK CONTROL 3 comprises: link is sent in controller PLC, actuator motor 1, controlled device extruded polymer melt, pressure sensor P4, measurement and change.Each parts are according to as shown in Figure 4 structural order connection line, and pressure sensor P4 is positioned at the entry position of gear pump 4, and controller PLC is used to control motor 1.The control principle of extrusion pressure FEEDBACK CONTROL 3 is: controller PLC sends control signal, and control motor 1 drives the screw rod rotation with certain rotational speed, is fed forward polymer masses endlessly.Fused materials is assembled at outlet of extruder, pressure sensor P4 is used for measuring the force value size at this place, measure and become collection, amplification filtering, the A/D conversion of sending link to carry out signal and after becoming signal is sent into PLC, PLC handles pressure feedback value and setting value, thereby the control signal that must make new advances, the extrusion pressure of controlling melt repeatedly like this.
In like manner, as shown in Figure 1: stock mould temperature FEEDBACK CONTROL 7 send link, controller PLC and motor-driven valve M4 to connect to form successively by temperature sensor T7, measurement and change, temperature sensor T7 is positioned at Minoxidil pattern 15 at a slow speed, be used for temperature in the measurement mode, the installation site of motor-driven valve M4 as shown in Figure 1; Stock mould pressure feedback control 8 send link, controller PLC and motor-driven valve M2 to connect to form successively by pressure sensor P2, measurement and change, and the installation site of pressure sensor P2 and motor-driven valve M2 as shown in Figure 1; Refrigerating gas pressure feedback control 11 send link, controller PLC and motor-driven valve M3 to connect to form successively by pressure sensor P3, measurement and change, and the installation site of pressure sensor P3 and motor-driven valve M3 as shown in Figure 1; Blowing agent pressure feedback control 16 send link, controller PLC and motor-driven valve M1 to connect to form successively by pressure sensor P1, measurement and change, and the installation site of pressure sensor P1 and motor-driven valve M1 as shown in Figure 1.
The physical foaming agent injected plastic extruded microchannel molding device course of work following (is example as the polymer raw material extrusion molding with linear low density polyethylene (LLDPE) (LLDPE)):
1. open the outer oil-bath of all heating collars and gear pump, setting heating-up temperature is 180 ℃;
2. open compressed air supply system 10, Compressed Gas begins to feed Minoxidil pattern 15 at a slow speed, heater 9, temperature are set at 200 ℃, and the temperature of stock mould temperature FEEDBACK CONTROL 7 is set at 160 ℃, the pressure of stock mould pressure feedback control 8 and is set at 1.6MPa.
1.. Minoxidil pattern 15 principles at a slow speed.Minoxidil pattern 15 is used for guaranteeing being partly dissolved of physical foaming agent injected plastic extruded microchannel forming method blowing agent at a slow speed.This installs at a slow speed, and decompression principle is: because the stock mould channel cross-section dwindles gradually, air velocity increases, and according to Bernoulli equation, pressure reduces gradually.The temperature and pressure that temperature and pressure sensor 25 is used to monitor in the stock mould distributes.The rapid drawdown of ambient pressure and temperature when this stock mould has avoided plastic melt to leave mouthful mould has been kept plastic melt 27 and has been extruded inside and outside the back to a certain degree pressure balance.Simultaneously, keep pressure and temperature and guarantee the dissolving of blowing agent 29 in plastic melt 27;
2.. temperature field and pressure field regulator control system are made up of stock mould temperature FEEDBACK CONTROL 7, stock mould pressure feedback control 8, heater 9, compressed air supply system 10, temperature sensor T6, T7 and T8, pressure sensor P2, electrically operated valve M2 and M4, corresponding pipeline as shown in Figure 1.This regulator control system is controlled interior temperature field and the pressure field of Minoxidil pattern at a slow speed, takes over the Compressed Gas feeding stock mould inner chamber of 24 (only marked one among the figure, actual rings evenly distributes 4 around stock mould) with uniform temperature and pressure by the air-flow of stock mould.This default temperature, pressure are respectively that the Compressed Gas of 160 ℃ and 1.6MPa is taken over 24 by air-flow and fed in the stock moulds 15 in the representative instance.Compressed Gas part by compressed air supply system 10 supplies is heated to 200 ℃ through heater, regulates flow by motor-driven valve M4 and mixes with the normal temperature compressed air of another strand; Pressure sensor P2 FEEDBACK CONTROL motor-driven valve M2 regulates the flow of mist; Temperature sensor T8 FEEDBACK CONTROL motor-driven valve M4 regulates the thermal current flow, thus the gas temperature in the control stock mould.Mix to regulate method of temperature by hot and cold air and can realize quick adjustment temperature.These two FEEDBACK CONTROL circulations realize the quick regulation and control of compression pressure, flow and temperature.
3. the outer oil-bath of circle to be heated and gear pump is heated to 180 ℃ and keeps stablely, and temperature and pressures maintain 160 ℃ and 1.6MPa substantially in the Minoxidil pattern 15 at a slow speed.Starter motor 1, the extrusion pressure value of extrusion pressure FEEDBACK CONTROL 3 is made as 2MPa;
4. the starter receiver pump is used to improve evenly extruding and pressure stability of plastic melt;
5. open motor-driven valve M3, it is 0.4MPa that the refrigerating gas pressure feedback is controlled 11 setting pressures.After plastics were extruded part and left stock mould, for realizing as shown in Figure 1, utilizing compressed air that the exit is cooled off to extruding the quick cooling and shaping of part, stream pressure and flow were by refrigerating gas pressure feedback control 11 regulation and control;
6. the LLDPE raw material is poured in the barrel of extruder 2;
7. after treating that plastics are extruded that part is stable and extruded, open motor-driven valve M1, feed the blowing agent 29 of blowing agent supply system 17 supplies, it is 1.6MPa that the blowing agent pressure feedback is controlled 16 setting pressures.The control 16 of blowing agent pressure feedback is regulated motor-driven valve M1 according to pressure sensor P1 and is regulated blowing agent pressure and flow on the pipeline;
8. treat plastics extrude stable after, rolling or cut and obtain final extruded product.
The utility model physical foaming agent injected plastic extruded microchannel molding device is applicable to be produced plastics microtubule, doughnut, micromachine plastic products etc. all needs micron order internal diameter passage, and to channel cross-section circularity have relatively high expectations the hollow plastic extruded product.The raw material that is suitable for comprises that polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), polyurethane (PU), polyamide (PA), polyolefin elastomer etc. can extrude the thermoplastic polymer of extruded products such as processing tubing, profile shapes.The requirement simultaneously of these thermoplastic polymers can be dissolved physical blowing agents a kind of or certain several fluid attitude, and rate of dissolution and solubility in the certain limit are arranged.The blowing agent that is suitable for comprises inert gas blown agent, chloro-fluoro-carbon kind blowing agent, hydrogen fluorohydrocarbon class blowing agent, alkanes blowing agent, overcritical C0 2, the water or other fluid state physical blowing agent.

Claims (4)

1. physical foaming agent injected plastic extruded microchannel molding device, it is characterized in that it comprises with lower member: motor (1), extruder (2), gear pump (4), heating collar (5), head and mouthful mould (6), heater (9), compressed air supply system (10), refrigerating gas nozzle (12), chill roll (14), Minoxidil pattern (15), blowing agent supply system (17), pressure sensor P1～4, temperature sensor T1～7, motor-driven valve M1～4 at a slow speed; Wherein, the screw rod in the rotating shaft of described motor (1) and the extruder (2) connects by shaft coupling; Extruder (2), gear pump (4), head and mouthful mould (6) and at a slow speed Minoxidil pattern (15) connect by flange successively; Two refrigerating gas nozzles (12) are arranged in plastics up and down and extrude the part (13) and the junction of Minoxidil pattern (15) at a slow speed, extrude part (13) a pair of chill roll (14) is installed up and down, blowing agent supply system (17) links to each other with a head and a mouthful mould (6) by pipeline.
2. according to the described physical foaming agent injected plastic extruded microchannel molding device of claim 1, it is characterized in that a described head and a mouthful mould (6) comprising: head connector (18), core body (19), runner transition body (20), mouthful mould (21), outer modular ring (22); Wherein, described head connector (18) and runner transition body (20) connect; Mouth mould (21) is placed in the opening of runner transition body (20); by the outer modular ring (22) that is threaded in the opening mouth mould (21) is fixed; core body (19) is gone up the location at head connector (18), and the core body syringe needle (23) on the core body (19) is equal with mouthful mould (21) exit face.
3. according to the described physical foaming agent injected plastic extruded microchannel molding device of claim 2, it is characterized in that core body (19) links to each other by pipeline with blowing agent supply system (17), and pressure sensor P1 and motor-driven valve M1 are arranged on the pipeline; Interior setting pressure of Minoxidil pattern (15) and temperature sensor (25) at a slow speed, take over (24) by air-flow and be connected, heater (9), temperature sensor T5 and T6, pressure sensor P2, motor-driven valve M2 and M4 are installed on the supply line with the compressed air supply line; Two refrigerating gas nozzles (12) are connected by pipeline with compressed air supply system (10), and pressure sensor P3 and motor-driven valve M3 are arranged on the pipeline.
4. according to the described physical foaming agent injected plastic extruded microchannel molding device of claim 2, it is characterized in that the described pattern of Minoxidil at a slow speed (15) comprising: air-flow is taken over (24), pressure and temperature sensor (25), typing die body (26); Wherein, described air-flow adapter (24) and pressure and temperature sensor (25) are arranged on the typing die body (26).
CN2010202652736U 2010-07-20 2010-07-20 Forming device of injected plastic extrusion microchannel of physical foaming agent Expired - Fee Related CN201721042U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101905535A (en) * 2010-07-20 2010-12-08 浙江大学 Physical foaming agent injected plastic extruded microchannel molding device and method
CN106079463A (en) * 2016-06-22 2016-11-09 浙江奥威狮集成家居科技有限公司 A kind of production technology of energy-saving environmental-protection board

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101905535A (en) * 2010-07-20 2010-12-08 浙江大学 Physical foaming agent injected plastic extruded microchannel molding device and method
CN101905535B (en) * 2010-07-20 2012-11-14 浙江大学 Physical foaming agent injected plastic extruded microchannel molding device and method
CN106079463A (en) * 2016-06-22 2016-11-09 浙江奥威狮集成家居科技有限公司 A kind of production technology of energy-saving environmental-protection board
CN106079463B (en) * 2016-06-22 2018-07-06 浙江奥威狮集成家居科技有限公司 A kind of production technology of energy-saving environmental-protection board

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