CN102729394A - Method and device for injection molding of foamed plastics product - Google Patents
Method and device for injection molding of foamed plastics product Download PDFInfo
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- CN102729394A CN102729394A CN201210202041XA CN201210202041A CN102729394A CN 102729394 A CN102729394 A CN 102729394A CN 201210202041X A CN201210202041X A CN 201210202041XA CN 201210202041 A CN201210202041 A CN 201210202041A CN 102729394 A CN102729394 A CN 102729394A
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Abstract
The invention relates to an injection production method for a foamed plastic product. The method comprises the following steps: introduction of a plastic liquid generation foaming agent, plastic liquid conveying, preparation of a single phase solution, plastic liquid nucleation, and product molding, wherein the plastic liquid nucleation comprises that the plastic liquid on a material storage tube outlet is guided to a material injection tube, such that the pressure difference between the material storage tube and the material injection tube is greater than the nucleation pressure of the plastic liquid, a forming nucleation area of the plastic liquid is formed on a material inlet of the material injection tube, and the plastic liquid inside the material injection tube is the plastic liquid after foaming nucleation. The special device for the method in the present invention comprises a material feeding tube with a screw, wherein the tube is provided for conveying plastic, and is provided with a plastic feeding mechanism and a foaming agent introduction mechanism, an outlet of the material feeding tube is concurrently connected with the two material storage tubes with the screw respectively through check valves. The outlet of the material storage tube is communicated with the material injection tube with a piston rod. The pressure difference between the material storage tube and the material injection tube is greater than the nucleation pressure of the plastic liquid, and the forming nucleation area of the plastic liquid is formed on the material inlet of the material injection tube. A nozzle of the material injection tube is aligned to a molding die.
Description
Technical field
The present invention relates to the forming method and the equipment thereof of foaming plastics product.
Background technology
One of CBA or physical blowing agent mix with the molten polymer parent, can make the foamed products of polymer.For example using generally is that the CBA of low molecular weight organic compound mixes with molten polymer, and is heated at least a gas of release in the critical-temperature, with the foamed products of manufacturing polymer.And physical blowing agent is essentially gas under atmospheric environment, in process, is introduced into molten polymer to mix, or under pressure, becomes a kind of composition that polymer contains, to make the foamed products of polymer.The polymer foaming product that premature expansion technology is made often has big relatively space or air chamber, that is its air cell size is greater than 100 microns, and in foamed products, has incomparable inconsistent air cell size to distribute and lower air chamber density.
In order to obtain more strong Yu lighter foamed products, and there are the littler air cell size of various acquisitions and the foaming process technology of higher air chamber density to be disclosed.There are some researches show, be reduction air cell size and increase air chamber density, and the supercritical fluid state of mixed melting polymer and material forms a mutual single phase soln that dissolves, and then on single phase soln, causes thermodynamic (al) instability, takes place to induce its air chamber nucleation.Traditionally known, various foaming process technologies obtain foamed products to cause the thermodynamic instability on single phase soln.For example, the foaming process technology of extrusion molding, injection moulding, moulding and so on.
Wherein, the nucleation on single phase soln can be considered: the group that the molecule of supercritical fluid gets into the stable air pocket that in polymer, has clear boundary changes.
Through causing thermodynamic (al) instability, on a single phase soln, obtain the air chamber nucleation of a high ratio, be one of key that obtains high air chamber density.To causing a thermodynamic (al) instability, can see through and change pressure, temperature or both rapidly.Solubility because of the supercritical fluid in a molten polymer becomes with pressure and temperature.In classic nucleation theory, air chamber nucleation rate will increase with the increase of pressure drop rate.Therefore, through making single phase soln suffer a rapid pressure drop, promote a high air chamber nucleation ratio.
On the ideal, hope pressure drop moment generation, but this is impossible.In fact, pressure drop must be through limited time period.Pressure drop more rapidly causes bigger thermodynamic instability more, makes the air chamber of getting over bigger quantity by nucleation; And the higher air chamber density on the poromerics generally corresponds to littler air cell size.
In some researchs, disclose the maximum solvable total quantity of supercritical fluid in single phase soln, depend on the operating pressure and the temperature that put on single phase soln.For example: more high pressure can promote the solvable total quantity of bigger maximum of supercritical fluid under uniform temp.And, the single phase soln under identical pressure and temperature condition, under identical nucleation condition, when containing less blowing agent solubility in single phase soln, air chamber density is also less in the polymer foaming product that is generated.
Thereby the high-dissolvability of supercritical fluid in the molten polymer is another key that obtains high air chamber density.
Obviously improve and be applied to the pressure on single phase soln; Can improve the solubility of supercritical fluid in the polymeric blends; And be easy to obtain more huge pressure drop rate to promote the thermodynamic instability in the nucleation process, be beneficial to the air chamber that improves in the foamed products and become nuclear volume and obtain more strong microporous foam product.
The foaming plastics product injection forming method nucleation district of convention all is designed in outside the nozzle, is the maximum place of pressure drop of feed liquid here, and stable as far as possible for the one-tenth nuclear state of the feed liquid that guarantees to get into mould in addition, the nucleation district also need be near mould.
There is following shortcoming in this method: 1. injection can only provide the short time high pressure; The pressure drop rate in nucleation district is difficult to keep stable for a long time; The product difficulty of processing big quality is bigger; Because the reduction of feed volume of big quality product is big, can not injects at short notice and finish, thereby be difficult to guarantee the feed liquid nucleation situation self-consistentency of product each several part; 2. how product needs pressurize at the beginning of the in-mold molding, therefore needs to adopt the mould of particular design, needs the band pressurizer on the mould, has increased production cost.
Discontinuous foaming process to injection and so on; The normal extra single phase soln accumulator that has plunger of using; Before single phase soln of in the extrusion process, producing is injected; Under high pressure accumulate the required single phase soln of enough injections, then produce the bigger high pressure of moment more huge pressure drop rate is provided by injection.The suitable cooling of the single phase soln before this extra accumulator Chang Zuowei injection is beneficial to abscess and fixes.
Yet to the discontinuous foaming process of injection moulding and so on, its technology is periodically paused the polymeric material input, and is unfavorable for the stable mixed proportion of blowing agent and polymer.For example: when polymeric material input paused, near the molten polymer the blowing agent intake because of the long resident blowing agent that is prone to contain higher dosage, made to cause the uneven distribution of blowing agent in mixture introduced; This possibly make the viscosity change of mixture and the technology controlling and process that is unfavorable for producing foamed products.And the uneven distribution of blowing agent in mixture is unfavorable for the uniformity of foamed products.
For pausing, the periodic plastics input that solves injection mechanism causes the uneven distribution of blowing agent in plastics; Chinese patent has been announced a kind of injection-expansion molded plastic resin products and production method thereof for 97111630.X number; The introducing of blowing agent and dissolving operation are separated from injection and forming operation; Pressure in the recipient is kept preferably, and the blowing agent more stable with acquisition measures, thereby obtains the stable mixed proportion of gas foaming agent and plastics.Implement in the exemplary system of this method; Comprise the casing drum that is connected with air delivery device, hopper, heater; Be provided with the screw rod that is connected with rotary drive mechanism in the casing drum, the front end of casing drum is communicated with the inner chamber of two discharge barrels respectively, is communicated with nozzle as the inner chamber of the discharge barrel of storage compartment; And opening or closing of valve control nozzle arranged, and when nozzle is opened, be communicated with the die cavity of storage compartment and mould.And each discharge barrel can be distinguished corresponding mould, or the simultaneously corresponding mould of whole discharge barrels.Wherein, the screw rod in the casing drum generally comprises charging, transmission, blowing agent introducing, mixes and metering section.
Fig. 1 is that the summary signal of said system shows.Its course of work is: granulated polymer in the hopper 109 gets into to have in the processing unit (plant) 101 of screw rod as one of casing drum and is heated into molten condition; And with introduce supercritical fluid as blowing agent and mix and before getting into cooling step, dissolve each other, make feed liquid form a kind of non-nucleation, homogeneous, fluid, single-phase solution; Pass through interface channel 102 via switch 103 one of them from the feed liquid in the casing drum by the discharge barrel 108 of selectable adding outfit plunger; In the usefulness that can be used as this selection effect as the switch 103 before the discharge barrel 108 of syringe, can settle static mixer in the connecting channel 102; When feed liquid during via one of them metered charge of 103 pairs of discharge barrels 108 of switch, cause that the plunger of this one of them discharge barrel 108 is retreated, remain on mutual dissolved state through the control plunger to impel feed liquid; After the discharge barrel of one of them metering is accomplished when this, then be injected to die for molding; At this in discharge barrel of one of them injection, the discharge barrel of 103 pairs on switch this one of them is closed and another discharge barrel is communicated with metered charge, after this another discharge barrel metering is accomplished, then is injected to die for molding; In this another discharge barrel injection, 103 pairs of these another discharge barrels of switch are closed and one of them discharge barrel of original this is communicated with metered charge; Injection molding microporous foam product is produced in so alternate feeding, injection at short notice continuously.This kind system architecture, the pressure oscillation when making injection can not have influence on the introducing of blowing agent.
There is following shortcoming in the method: 1, when having the blowing agent of high concentration in the feed liquid, for obtaining to get into single-phase, the non-nuclear of discharge barrel 108, uniform feed liquid by casing drum 101, the back pressure far above the blowing agent critical pressure must be provided in the casing drum; Thereby cause the injection pressure that blowing agent injects in the casing drum is raise, injecting difficulty and strengthen, cost rises.
2, for the lasting pressure in the sufficiently high discharge barrel is provided; To keep the dissolving of the high concentration blowing agent in the discharge barrel; Make the quantity that helps improving the air chamber nucleation; Need in the casing drum very high pressure could feed liquid be injected in the discharge barrel, thus increase reinforced screw rod resistance, cause the pressure-bearing of machine barrel big, cost is high.
To obtaining the polymer foaming product of higher air chamber density, known traditionally thermodynamic (al) instability and the solubility of supercritical fluid in polymer are two main keys.
Continuous foamed process technology with respect to extrusion molding and so on; The discontinuous foaming process technology of above-mentioned injection moulding and so on; Can from injection and forming operation, separate by the introducing of blowing agent and dissolving operation, the very high pressure drop speed of injection transient is provided, to produce bigger thermodynamic instability.Yet; Technological to traditional injection moulding, if the blowing agent dissolving is not accomplished to form single phase soln as yet before the injection feed liquid, then necessary controlled pressure is in the formation that continues to wait under the sufficiently high pressure single phase soln; This will have influence on the formed product cycle, with the production that is unfavorable for foamed products.Because, before the injection feed liquid,, be easy to cause blowing agent uneven distribution in material liquid mixture if the blowing agent in the feed liquid is under static state, to accomplish dissolving fully, and the technology controlling and process that is unfavorable for producing foamed products.This kind situation causes the foaming process of using conventional system architecture, and the introducing operation of its blowing agent should not be independent of before nucleation outside the dissolving operation to single phase soln.Thereby traditionally, controlled pressure is with in acquisition single phase soln process, and the change of the controlled pressure on this feed liquid will influence the introducing of blowing agent.For example, when higher controlled pressure demand is arranged in the process, the introducing pressure of necessary corresponding raising blowing agent.
In addition,, introduce the excessive blowing agent or the pressure fluctuation in each cycle in the polymer matrix in the feed liquid, will make blowing agent in process, be difficult for being dissolved in polymer matrix fully, and be unfavorable for the air chamber size identical property of foamed products injection molding technology.This kind puzzlement can be by being increased in the controlled pressure that applies higher lasting back pressure before the injection feed liquid on the feed liquid of discharge barrel, or according to the concentration of the corresponding reduction blowing agent of the maximum solvable total quantity of blowing agent in single phase soln in single phase soln, alleviates obtaining.The short time high pressure that injection provides its objective is producing bigger thermodynamic instability, but not guarantees that blowing agent is dissolved in polymer matrix fully in process but traditionally; So in the conventional art; The very high lasting back pressure that needs above the blowing agent dissolving is provided in the discharge barrel before injection; To cause the introducing pressure of necessary corresponding raising blowing agent, the dissolving operating pressure in the casing drum, and cause the to a certain degree puzzlement in the process.And, even the general solubility of blowing agent is operated, similar puzzlement is also arranged.
And, for the continuous foamed process technology of traditional extrusion molding and so on, before single phase soln nucleation its feed liquid is kept very high more high pressure, to reduce or to prevent the undesired blowing agent nucleation that environmental fluctuating causes, needs are also arranged.
Be analogous to injection molding technology,,, must on polymeric blends, apply higher enough pressure for obtaining the more high-dissolvability of supercritical fluid in the molten polymer to an extruding foaming molding process.This kind situation must corresponding cooperation further improve the pressure that is provided blowing agent, to obtain this more single phase soln of high-dissolvability.Thereby puzzlement supercritical fluid in polymer must be introduced under the higher relatively pressure relatively.And; When the very high pressure of the blowing agent dissolving action need that obtains single phase soln; The screw mixes step of molten polymer and blowing agent becomes comparatively difficulty in the process with making; And the high pressure resistance of this kind possibly cause the idle running of reinforced screw rod, and is unfavorable for producing foamed products, particularly when the stickiness of feed liquid itself is hanged down.
To general foaming process, get in the molten polymer for being introduced in the blowing agent that is gaseous state under the environmental condition, its blowing agent be provided the 50psi at least that exerts pressure on the polymer that pressure must be higher than contiguous blowing agent intake usually.
But; Because tradition foaming process is not separated the introducing and dissolving operation of blowing agent; Thereby in the continued operation process of the introducing of the blowing agent that obtains single phase soln and dissolving, by the introducing blowing agent to molten polymer, the mixing of blowing agent and molten polymer, dissolving; To the acquisition of single phase soln, often be asked in the nucleation operating process that gets into single phase soln before, accomplish.So; Introduce pressure for higher blowing agent,, need the special extra disposal that increases making blowing agent be easier to upstream flow to polymer fluid; To reduce or to prevent the charging aperture effusion of blowing agent, particularly when the introducing of blowing agent stops from the upper reaches of polymer fluid.
In addition, to traditional extrusion technique, for introducing blowing agent under lower pressure, restriction is applied to the pressure of keeping on the preceding single phase soln of nucleation relatively, is unfavorable for when nucleation, providing bigger thermodynamic instability.For example: in traditional extruded plastic foam process; For obtaining strong extrusion molding microporous foam product; Need apply a high pressure drop rate to the single phase soln before the nucleation; But because of being difficult for applying on the single phase soln before nucleation the very high pressure of keeping,, it reaches so often reducing by the opening cross sectional area in punching block gap as far as possible.Yet, when the area in the opening cross section in punching block gap reduces,, and can not make thick foaming product with the foaming product attenuation that causes production; Otherwise, in order to make thick foaming product, and increasing the area in the opening cross section in punching block gap, the pressure drop rate when reducing the feed liquid nucleation causes the microporous foam product that can not obtain to want.
But those inventors do not find, and separate the introducing operation of blowing agent and the formation operation of single phase soln, can be easy to provide the formation operation of extremely high pressure in single phase soln, to obtain the more high-dissolvability of blowing agent in single phase soln.And; This kind situation can be introduced under the pressure at lower or identical blowing agent, is easy to provide higher keeping on pressure single phase soln before nucleation; To solve is the introducing pressure that cooperates blowing agent traditionally; And make on the single phase soln before nucleation to keep pressure limited, thereby have to reduce the introducing dosage of blowing agent, form because of environmental fluctuating causes the second phase in the single phase soln before nucleation preventing.
Therefore, needs are arranged, develop a kind of foaming process technology, under lower pressure, introduce blowing agent to polymer, to obtain that the blowing agent solubility identical with tradition is arranged in polymeric blends.This kind situation is beneficial to and introduces blowing agent under lower pressure, with the solubility of further raising blowing agent in polymeric blends.And, also need a kind of technology, provide high and keep on pressure single phase soln before nucleation, and need not to cooperate simultaneously the introducing pressure of further raising blowing agent, to prevent causing undesired single phase soln nucleation because of environmental fluctuating.
Summary of the invention
The present invention will solve the production method of existing foaming plastics product and the shortcoming of the production of the incompatible big quality product of equipment, and a kind of injection method for producing and equipment of foaming plastics product of production of suitable big quality product is provided.
Keep on another object of the present invention single phase soln before being provided at nucleation and be analogous to traditional lasting high pressure, and the introducing pressure of blowing agent can be lower than traditional introducing pressure relatively, the introducing of blowing agent become relatively be easier to.Thereby, to introduce under the pressure at lower blowing agent, reinforced screw rod is difficult for because of high pressure resistance causes idle running relatively, and is beneficial to the production foamed products, particularly when the stickiness of feed liquid itself is hanged down.And lower blowing agent is introduced pressure, helps reducing or prevents that blowing agent from overflowing from the charging aperture at the upper reaches of polymer fluid.
Be easy to keep on of the present invention one other purpose single phase soln before being provided at nucleation and be higher than traditional lasting high pressure, be beneficial to reduce or prevent the undesired blowing agent nucleation that pressure oscillation causes.
The injection method for producing of foaming plastics product of the present invention comprises:
1), feed liquid generates, the introducing step of blowing agent, has transferring polymer material in the casing drum of screw rod one, and be introduced in the blowing agent that is gaseous state under the environmental condition and get into the feed liquid that this polymeric material forms polymeric blends;
2) feed liquid supplying step carry this feed liquid to get into a selecteed material storage tube from the outlet of casing drum, and controlled pressure is dissolved in the polymeric material part of the blowing agent of this feed liquid;
3) the acquisition step of single phase soln, the pressure in the control material storage tube dissolves the blowing agent and the polymeric material of the feed liquid in this selecteed material storage tube each other, to obtain single phase soln; Wherein the change of the pressure in this material storage tube does not influence the introducing of blowing agent in this acquisition single phase soln process;
4) the nucleation step of feed liquid; The feed liquid of material storage tube outlet is guided to the tube that shoots material; The difference of the pressure that makes material storage tube and the pressure of the tube that shoots material is greater than the nuclear pressure that becomes of feed liquid, forms the foaming nucleation district of feed liquid at the charging aperture of the described tube that shoots material, and the feed liquid in the tube that shoots material is the feed liquid behind the foaming nucleation;
5) formed product step, the nucleation feed liquid in the tube that will shoot material is injected a mould, cooling forming gentlely.
Further, in step 1 content of blowing agent in feed liquid less than 5%.
The main distinction of the inventive method and prior art is: the nucleation foaming process of feed liquid of the present invention is accomplished in the tube that shoots material; Rather than outside the nozzle of tube that shoots material, accomplish; Pressure as long as control shoots material in the tube and the pressure in the material storage tube; Just can guarantee that there is continual and steady pressure drop rate in the nucleation district, thereby can obtain the uniform and stable feed liquid of foaming nucleation situation constantly.This advantage has superiority for the moulding of the big quality product of a large amount of feed liquids of needs especially.By way of parenthesis, owing to need not nucleation foaming in mould, mould need not pressurize, therefore when the injection moulding foamed products, can use common die, has reduced production cost.
When low foaming agents content (less than 5%), the inventive method is effective especially.
The special equipment of production method of the present invention; Comprise and be used to carry one of plastics to have the casing drum of screw rod; Described casing drum is provided with plastics and adds mechanism and blowing agent introducing mechanism; It is characterized in that: the outlet of casing drum connects two material storage tubes that have piston rod through check valve respectively simultaneously, and the outlet connection one of described material storage tube has the tube that shoots material of piston rod; The difference of the pressure of described material storage tube and the pressure of the tube that shoots material forms the foaming nucleation district of feed liquid greater than the nuclear pressure that becomes of feed liquid at the charging aperture of the described tube that shoots material; The most accurate mould of nozzle of the described tube that shoots material.
Advantage of the present invention is: can obtain the uniform and stable feed liquid of foaming nucleation situation constantly, help making big quality product; When method of radiation is made foamed products, need not the mould pressurize, save cost; The pressure environment of feed liquid is stable, and continuation is good, is convenient to control the foaming nucleation process; Reinforced screw rod pressure is less.
Description of drawings
Fig. 1 is the structural representation of Chinese patent 97111630.X number.
Fig. 2 is the structural representation of equipment of the present invention.
The specific embodiment:
With reference to accompanying drawing 2:
The injection method for producing of foaming plastics product of the present invention comprises:
1), feed liquid generates, the introducing step of blowing agent, has transferring polymer material in the casing drum of screw rod one, and be introduced in the blowing agent that is gaseous state under the environmental condition and get into the feed liquid that this polymeric material forms polymeric blends;
2) feed liquid supplying step carry this feed liquid to get into a selecteed material storage tube from the outlet of casing drum, and controlled pressure is dissolved in the polymeric material part of the blowing agent of this feed liquid;
3) the acquisition step of single phase soln, the pressure in the control material storage tube dissolves the blowing agent and the polymeric material of the feed liquid in this selecteed material storage tube each other, to obtain single phase soln; Wherein the change of the pressure in this material storage tube does not influence the introducing of blowing agent in this acquisition single phase soln process;
4) the nucleation step of feed liquid; The feed liquid of material storage tube outlet is guided to the tube that shoots material; The difference of the pressure that makes material storage tube and the pressure of the tube that shoots material is greater than the nuclear pressure that becomes of feed liquid, forms the foaming nucleation district of feed liquid at the charging aperture of the described tube that shoots material, and the feed liquid in the tube that shoots material is the feed liquid behind the foaming nucleation;
5) formed product step, the nucleation feed liquid in the tube that will shoot material is injected a mould, cooling forming gentlely.
Further, in step 1 content of blowing agent in feed liquid less than 5%.
The main distinction of the inventive method and prior art is: the nucleation foaming process of feed liquid of the present invention is accomplished in the tube that shoots material; Rather than outside the nozzle of tube that shoots material, accomplish; Pressure as long as control shoots material in the tube and the pressure in the material storage tube; Just can guarantee that there is continual and steady pressure drop rate in the nucleation district, thereby can obtain the uniform and stable feed liquid of foaming nucleation situation constantly.This advantage has superiority for the moulding of the big quality product of a large amount of feed liquids of needs especially.By way of parenthesis, owing to need not nucleation foaming in mould, mould need not pressurize, therefore when the injection moulding foamed products, can use common die, has reduced production cost.
When low foaming agents content (less than 5%), the inventive method is effective especially.
The special equipment of production method of the present invention; Comprise and be used to carry one of plastics to have the casing drum 1 of screw rod; Described casing drum is provided with plastics and adds mechanism 2 and blowing agent introducing mechanism 3; It is characterized in that: the outlet of casing drum 1 connects two material storage tubes 6,7 that have piston rod through check valve 4,5 respectively simultaneously, and the outlet connection one of described material storage tube 6 and material storage tube 7 has the tube 8 that shoots material of piston rod; The difference of the pressure of described material storage tube 6,7 and tube 8 the pressure that shoots material forms the foaming nucleation district of feed liquids greater than the nuclear pressure that becomes of feed liquid at the charging aperture 81 of the described tube 8 that shoots material; The described nozzle 9 that shoots material tube 8 is aligned to type die 10.
The described content of this specification embodiment only is enumerating the way of realization of inventive concept; Protection scope of the present invention should not be regarded as and only limit to the concrete form that embodiment states, protection scope of the present invention also reach in those skilled in the art conceive according to the present invention the equivalent technologies means that can expect.
Claims (3)
1. the injection method for producing of foaming plastics product comprises:
1), feed liquid generates, the introducing step of blowing agent, has transferring polymer material in the casing drum of screw rod one, and be introduced in the blowing agent that is gaseous state under the environmental condition and get into the feed liquid that this polymeric material forms polymeric blends;
2) feed liquid supplying step carry this feed liquid to get into a selecteed material storage tube from the outlet of casing drum, and controlled pressure is dissolved in the polymeric material part of the blowing agent of this feed liquid;
3) the acquisition step of single phase soln, the pressure in the control material storage tube dissolves the blowing agent and the polymeric material of the feed liquid in this selecteed material storage tube each other, to obtain single phase soln; Wherein the change of the pressure in this material storage tube does not influence the introducing of blowing agent in this acquisition single phase soln process;
4) the nucleation step of feed liquid; The feed liquid of material storage tube outlet is guided to the tube that shoots material; The difference of the pressure that makes material storage tube and the pressure of the tube that shoots material is greater than the nuclear pressure that becomes of feed liquid, forms the foaming nucleation district of feed liquid at the charging aperture of the described tube that shoots material, and the feed liquid in the tube that shoots material is the feed liquid behind the foaming nucleation;
5) formed product step, the nucleation feed liquid in the tube that will shoot material is injected a mould, cooling forming gentlely.
2. the injection method for producing of foaming plastics product as claimed in claim 1, it is characterized in that: the content of blowing agent in feed liquid is less than 5% in step 1.
3. the special equipment of the described production method of claim 2; Comprise and be used to carry one of plastics to have the casing drum of screw rod; Described casing drum is provided with plastics and adds mechanism and blowing agent introducing mechanism; It is characterized in that: the outlet of casing drum connects two material storage tubes that have piston rod through check valve respectively simultaneously, and the outlet connection one of described material storage tube has the tube that shoots material of piston rod; The difference of the pressure of described material storage tube and the pressure of the tube that shoots material forms the foaming nucleation district of feed liquid greater than the nuclear pressure that becomes of feed liquid at the charging aperture of the described tube that shoots material; The most accurate mould of nozzle of the described tube that shoots material.
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| CN201210202041XA CN102729394A (en) | 2012-06-15 | 2012-06-15 | Method and device for injection molding of foamed plastics product |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103913213A (en) * | 2014-04-10 | 2014-07-09 | 龙泉市金鸿汽车空调有限公司 | Automatic DMC material metering machine |
| CN104972601A (en) * | 2014-04-02 | 2015-10-14 | 青岛佳友模具科技有限公司 | Injection molding method of double-color super-thick cladding element |
| CN105397996A (en) * | 2015-12-15 | 2016-03-16 | 佛山市川东磁电股份有限公司 | Secondary forming technology and die structure of sensor shell containing graphene |
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| US20030233792A1 (en) * | 2002-06-24 | 2003-12-25 | Kramer Stephen J. | Foamed mechanical planarization pads made with supercritical fluid |
| CN101746014A (en) * | 2008-12-08 | 2010-06-23 | 北京化工大学 | Micro-foam injection molding machine and molding process thereof |
| CN102173056A (en) * | 2010-12-30 | 2011-09-07 | 联塑(杭州)机械有限公司 | Method for forming foam products and system thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030233792A1 (en) * | 2002-06-24 | 2003-12-25 | Kramer Stephen J. | Foamed mechanical planarization pads made with supercritical fluid |
| CN101746014A (en) * | 2008-12-08 | 2010-06-23 | 北京化工大学 | Micro-foam injection molding machine and molding process thereof |
| CN102173056A (en) * | 2010-12-30 | 2011-09-07 | 联塑(杭州)机械有限公司 | Method for forming foam products and system thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972601A (en) * | 2014-04-02 | 2015-10-14 | 青岛佳友模具科技有限公司 | Injection molding method of double-color super-thick cladding element |
| CN103913213A (en) * | 2014-04-10 | 2014-07-09 | 龙泉市金鸿汽车空调有限公司 | Automatic DMC material metering machine |
| CN105397996A (en) * | 2015-12-15 | 2016-03-16 | 佛山市川东磁电股份有限公司 | Secondary forming technology and die structure of sensor shell containing graphene |
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Application publication date: 20121017 |