JP2011098518A - Two-in-one type kneading injection molding apparatus and method of using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-in-one type kneading injection molding apparatus and a method of using the apparatus. <P>SOLUTION: The apparatus includes: a kneading extrusion unit including a feed stage, a pressing stage, a melting stage, a kneading stage, a temperature drop stage and an injection molding stage; a distribution unit having at least one distribution passage having a valve control outlet connected to an inlet of a mold unit; and the mold unit. The method mainly includes supplying a polymeric substance into the feed stage, allowing the supplied polymeric substance to go through processes of pressing, melting, kneading with a physical foaming agent, temperature drop, etc., injecting the polymer mixture into the distribution unit through the injection molding stage, opening the valve control outlet to put the polymeric substance mixture into the mold unit so as to be full, and performing mold release to obtain a highly foamed product. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a device for producing a highly foamed product and a method for producing a highly foamed product using this apparatus, in particular, melting, kneading, temperature lowering, and precision measurement primary molding without passing through the granulation step, A 2-in-1 type kneading injection molding apparatus capable of rapidly and effectively preparing a highly foamed product and avoiding defects in the foamed product due to generation of foam blind spots or uneven foaming, and a method of using the same About.

  Conventionally, in the production of a highly foamed product, generally an expandable plastic resin material, for example, polystyrene (PS), polyolefin (PO), polyethylene (polyethylene; PE) or polypropylene (polypropylene; PP). Polyolefins such as are used. The foamed product is polylon, and the applicable range is mainly disposable products such as disposable tableware, instant noodle cups, soft drink cups, cushioning materials and packing materials. None of these steps are performed unless the pre-expanded microballs have passed.

  In the conventional injection molding foaming, the chemical foaming agent functions according to the decomposition temperature of the foaming agent. However, since the foaming agent is too much to function, it often results in waste of resources and environmental pollution. Also, since the expansion ratio of conventional injection molding foaming is low, the foaming effect achieved is undesirable.

  As a reference, the following patent applications are disclosed which disclose a conventional method for producing a highly foamed product.

  (1) The Taiwan Patent Application No. I269298 patent application discloses that after kneading the material composition with an extruder, it is poured into a high-pressure foaming tank, and pressure-adjusted and decompressed appropriately to produce foam beads. However, in this method, a highly foamed product cannot be obtained unless the process of granulating foam beads is passed.

  (2) Taiwan Published Patent Publication No. 00203072 patent application describes expandable thermoplastic microbeads that polymerize an ethylenically unsaturated monomer or monomer mixture in an aqueous medium in a reactor in the presence of a cooling accelerator and its preparation and use A method is disclosed.

  (3) Taiwan Published Patent Publication No. 00418227 patent application discloses foamable microbeads and a process for producing the same, and is contained in the outer shell of a resin formed from an ethylidene chloride copolymer or (meth) acrylic copolymer. Expandable microbeads encapsulated with a foaming agent and having an average particle size of 3 to 100 μm and a coefficient of variation of particle size distribution of 1.50% or less, and suspension polymerization method Relates to a process for producing expandable microbeads.

  (4) Taiwan Patent Gazette Publication No. 00466101 patent application discloses a method for preparing microcapsules containing an agriculturally active substance, in particular, that polyurea microcapsules for application to leaves are prepared by an interfacial polymerization program, The polyurea is prepared with an aromatic diisocyanate and a random polyisocyanate having a plurality of isocyanates so that the weight ratio of polyisocyanate: diisocyanate is about 1: 100 to 1:15. It has an average particle size of ˜5 μm.

  (5) Taiwan published patent publication No. 005754559 patent application is polymerized by condensation in a dispersion containing i) a solution containing a nonionic substance and ii) a bioactive solid substance insoluble or sparingly soluble in this solution. A method for microencapsulation of a bioactive solid material is disclosed that comprises polymerizing a monomer that is a polymer. The bioactive solid substance is an agricultural substance, and the nonionic substance has a substance capable of forming a protective colloid, and is composed of polyvinyl alcohol, cellulose ether or ester, polyalkylene glycol, polyvinyl pyrrolidone, and starch. Is at least one selected from As the monomer, a monomer of melamine resin or urea resin is used. It prepares microbeads by polymerization.

  (6) The Taiwan Patent Application No. 200401016 patent application discloses microencapsulated endothermic particles that are spray-coated on the surface of an object so that a large amount of heat is absorbed and that are easy to accumulate and release heat. The endothermic particles are microencapsulated microparticles having a core particle diameter of 1-1000 μm, and an outer shell which is a kind of polymer resin selected from melamine formaldehyde, urea formaldehyde resin, PU, and acrylic, and a melting point of about 35 ° C. It is composed of a core material that is a heat absorbing material selected from linear alkanes at 70 ° C., higher alcohols, and organic acid materials, and the weight ratio of the outer shell to the core material is about 1/20 to 1/2. .

  (7) Taiwan Published Patent Publication No. 200402326 patent application describes a phase change material comprising an aqueous polyurethane aqueous solution, a phase change material, an oil phase monomer, and a solid wax having a weight percentage concentration of about 5% to 40%. A composition for forming a microcapsule containing and a method for producing the microcapsule are disclosed. Here, the weight percentage concentration of the oil phase monomer dissolved in the phase change material is about 3% to 12%, and the weight ratio of the oil phase monomer to the aqueous polyurethane is about 25% to 50%. The composition is emulsified and stirred, and then the temperature is raised stepwise to perform the microcapsule process.

  If you look at the preparation methods according to the above prior art as a whole, most of the ones that have to go through the extrusion granulation step, in these methods, the material undergoes multiple thermal histories and the decomposition temperature of the chemical blowing agent. Is actually not very suitable for the production of highly foamed products. In addition, in the conventional foaming process by chemical foaming, even if a foaming agent is added to the kneaded composition in advance or a foaming agent is separately added, the chemical foaming agent is used for instantaneous shearing of the injection molding machine within a very short time. The material must be foamed at the same time as the gas is released by quickly reaching the decomposition temperature. However, since injection molding machines tend to overheat due to instantaneous shearing, they not only cause decomposition of the material, but also decompose the gas released by the foaming agent to cause phase separation from the polymer material, and most of the gas is resin. In other words, the foam cannot be re-fused and the foam becomes invalid, or the expansion ratio becomes too low, so that a preferable foam product cannot be obtained.

  In molding, conventionally, a molten material is directly injected into a mold at a high pressure, and since the pressure of the injected material drops rapidly in a short time, its volume rapidly expands simultaneously. It can be molded by filling the moldability and further cooling.

  However, the injected material is generally too strong to change in pressure, so it can expand rapidly in volume, but cannot be uniformly foamed, so the molded foam will have a structurally consistent toughness. In many cases, for example, the bubble breaking phenomenon tends to occur near the outer edge. Therefore, even when a foam having a simple shape is produced, there is a risk that a cracking defect may occur in the produced foam due to the non-uniform foaming described above.

  In view of this, in order to improve the above-mentioned many drawbacks, the present invention improves on the technology using conventional injection molding foaming and molding, and performs melting, kneading, temperature lowering and precision measurement primary molding. In addition to being able to quickly and effectively prepare a highly foamed product without passing through the granulation process, it is also possible to avoid defects in the foamed product due to the occurrence of foaming blind spots or uneven foaming. -1 type kneading injection molding apparatus and method of using the same. The inventor diligently studied and improved based on many years of experience and achieved the present invention.

  The main object of the present invention is to use kneading, kneading, temperature lowering, and precision measurement primary molding, so that a highly foamed product can be quickly and effectively prepared without passing through the granulation step. An object of the present invention is to provide a 2-in-1 type kneading injection molding apparatus having an extrusion unit.

  The main object of the present invention is to provide a distribution unit and a corresponding mold unit that can avoid occurrence of non-uniform foaming, reduce defects to a minimum, and effectively improve the yield of foamed products. It is to provide a 2-in-1 type kneading injection molding apparatus.

  In order to achieve the above-mentioned object, the present invention is suitably used for manufacturing a highly foamed product, and includes a 2-in-1 type including a kneading extrusion unit, a distribution unit, and a mold unit having at least one inlet. A kneading injection molding apparatus is provided. The kneading and extruding unit has an axis extending through the inside thereof and includes a feed stage, a pressing stage, a melting stage, a kneading stage, a temperature lowering stage, and an injection molding stage, so that a polymer substance can be introduced through a feed port. After the charging, processes such as pressing, dissolution, kneading with a physical foaming agent, and cooling are passed, and finally the polymer mixture is injected into the distribution unit via the injection molding stage. Here, the kneading stage is connected to a physical foaming agent supply unit, so that the physical foaming agent is supplied into the kneading stage and sufficiently kneaded with the molten polymer substance. The distribution unit is connected to an injection molding stage of the kneading extrusion unit, has at least one distribution path, and has a valve control outlet connected to the inlet of the mold unit for each distribution path. When the valve control outlet opens, the polymer substance mixture enters and fills the interior of the mold unit through the valve control outlet and the mold unit inlet.

The present invention is a method for producing a highly foamed product using the 2-in-1 type kneading injection molding apparatus,
(A1) introducing a polymer substance into the feed stage through a feed port;
(A2) pressing the polymer material by transporting the polymer material into the pressing step;
(A3) transporting the polymer material into the melting stage to dissolve the polymer material in a molten state;
(A4) a step of sufficiently kneading the molten polymer material with the physical foaming agent by transporting the polymer material into the kneading stage;
(A5) transporting the polymer substance mixture sufficiently kneaded with the physical foaming agent into the temperature lowering stage, thereby lowering the temperature of the polymer substance mixture and maintaining it in a molten state;
(A6) transporting the polymer substance mixture into the injection molding stage to be injected and filled into the distribution path of the distribution unit, wherein the valve control outlet is closed;
(A7) controlling to open the valve control outlet, and filling the polymer substance mixture into the mold unit through the open valve control outlet and the mold unit inlet and filling the mixture. I will provide a.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings so that the features and functions of the present invention can be more fully understood.

It is an upper view of the 1st Embodiment of this invention. It is sectional drawing of the 1st Embodiment of this invention. It is a top view of the 2nd Embodiment of this invention. It is sectional drawing of the 2nd Embodiment of this invention. It is a top view of the 3rd Embodiment of this invention. 6 is a flowchart illustrating a method of use using the present invention.

  The present invention provides a 2-in-1 type kneading injection molding apparatus for producing a highly foamed product, which includes a kneading extrusion unit, a distribution unit, and a mold unit. The kneading and extruding unit includes a feed stage, a pressing stage, a melting stage, a kneading stage, a temperature lowering stage, and an injection molding stage, thereby pressing, dissolving, kneading with a physical foaming agent, lowering the temperature, etc. Each process goes through and finally the polymer mixture is injected into the distribution unit via the injection molding stage. The distribution unit has at least one distribution path, and has a valve control outlet for each distribution path. The mold unit has at least one inlet communicated with a valve control outlet of the distribution path. When the valve control outlet opens, the polymer mixture enters and fills the interior of the mold unit via the valve control outlet and the mold unit inlet. Once released, a highly foamed product is obtained.

  1 and 2 show a first embodiment of a 2-in-1 type kneading injection molding apparatus used for manufacturing a highly foamed product according to the present invention. In the present embodiment, the 2-in-1 type kneading injection molding apparatus includes a kneading extrusion unit 10, a distribution unit 20, and a mold unit 30.

  The kneading and extruding unit 10 has a shaft 12 passing through the inside thereof, and includes a feed stage 102, a pressing stage 104, a melting stage 106, a kneading stage 108, a temperature lowering stage 110, and an injection molding stage 112. Here, the shaft 12 of the kneading and extruding unit 10 is connected to a motor 70, and the shaft 12 is rotated in conjunction with the power applied from the motor 70.

  The feed stage 102 is provided with a feed port 1020 to feed a polymer substance into the stage. In carrying out, by using different kinds of polymer substances, the expansion ratio can be controlled by the different melt viscosities. The polymer substance may be a resin or a modified product of corn starch lactic acid bacteria (Poly Lactic Acid; PLA). Here, the resin includes polystyrene (PS) resin, polyethylene (PE) resin, polypropylene (PP) resin, thermoplastic rubber (TPR) resin, and thermoplastic elastomer (thermo). -Plastic elastomer (TPE) resin is included, and the corn starch lactic acid bacteria modified product is a biodegradable non-lithiated product. Further, since the screw portion 120 is provided on the surface of the shaft rod 12 in the feed stage 102, when the shaft rod 12 is rotated by the motor 70, the charged polymer substance can be moved forward. it can.

  The pressing stage 104 presses the charged polymer substance, and the melting stage 106 melts the pressed polymer substance in a molten state by applying a high temperature. Further, a screw portion 120 is also provided on the surface of the shaft rod 12 inside the pressing stage 104 and the melting stage 106.

  In operation, the portion of the shaft rod 12 provided with the screw portion 120 includes a screw element having a high dispersion and high distribution form, and at least one gas injection hole and a gas injection hole at an appropriate position of the material cylinder after the compression section. At least one auxiliary agent injection hole may be provided. The portion of the screw 12 inside the melting stage 106 can supply heat energy in combination with a material cylinder around which a heating sheet is wound. The ratio between the length and the diameter (diameter) is preferably at least 28: 1.

  After the polymer material is pressed and dissolved, it is subsequently fed forward into the kneading stage 108. The kneading stage 108 is connected to the physical foaming agent supply unit 40 so that the physical foaming agent is supplied into the kneading stage 108 and sufficiently kneaded with the polymer material in a molten state.

  In implementation, the physical foaming agent supply unit 40 includes a high-pressure gas unit 402 and a gas blow-off pump unit 404, and the physical foaming agent used is of an organic type (for example, carbon alkane or highly volatile fluoride) or inorganic. It may be a mold (for example, nitrogen or carbon dioxide) and is injected into the kneading stage 108 by a flow valve stage or by mixing control.

  In addition, a plurality of mesh-like intersections may be provided on the surface of the screw 12 in the kneading stage 108, or at least one unidirectional twill may be provided. In the present embodiment, by providing the three mesh-like intersections 122 and one unidirectional twill part 124 on the surface of the screw 12, the stirring action of the polymer substance and the injected physical foaming agent can be obtained better. .

  The polymer substance mixture sufficiently kneaded with the physical foaming agent is subsequently sent to the temperature lowering stage 110 to be lowered in temperature. The portion of the shaft rod 12 in the temperature lowering stage 110 can perform a temperature lowering function in combination with a material cylinder in which a screw portion 120 is provided on the surface and a cooling hose is wound outside. The main reason for appropriately lowering the temperature of the polymer material mixture by the temperature lowering stage 110 is that the foaming agent and the polymer material mixture are sufficiently mixed, and then the melt strength of the mixture is controlled by lowering the temperature. This is to prevent the agent from becoming expired.

  In practice, the temperature drop needs to be maintained above the threshold temperature, i.e., after the temperature drop, the polymer material mixture must still remain in a molten state. Therefore, the temperature lowering stage 110 is preferably connected to the temperature / pressure measuring unit 50 in the vicinity of the injection molding stage 112 in order to monitor the temperature and pressure of the polymer substance mixture. Further, the ratio between the length of the shaft 12 in the temperature lowering stage 110 and the diameter (diameter) is at least 8: 1.

  After the polymer material mixture has been properly cooled, it is subsequently fed into the injection molding stage 112. In the present embodiment, the portion of the shaft rod 12 inside the injection molding stage 112 is provided with a mesh-like intersection 112 and a unidirectional twill 124 on the surface. In practice, the injection molding stage 112 is preferably connected to the measurement unit 60 in order to control the injection-molded amount of the polymeric material mixture.

  The injection molding stage 112 is connected to the distribution unit 20 so that the polymer material mixture in the injection molding stage 112 can be directly injected into the distribution unit 20. In the present embodiment, the distribution unit 20 has three distribution paths 202 extending vertically downward in parallel, and a valve control outlet 204 is provided at the end of each distribution path 202. The mold unit 30 in the present embodiment is a long mold, and at its upper end, three inlets 302 are provided corresponding to the valve control outlets 204 of the distribution unit 20, and each of the inlets 302 is connected to the valve control outlet 204. Communicated.

  The structural design of the distribution unit and the mold unit may be provided so as to extend the distribution path horizontally in addition to the method described in the embodiment. Here, the distribution path for horizontal stretching is provided so that the end is sealed, and a valve control outlet is provided at the bottom near the end. Alternatively, a valve control outlet may be provided at the end of the horizontal stretching distribution path. The entrance of the mold unit can be installed in the proper position according to the change in the structure of the distribution unit.

  When the polymer substance mixture enters the distribution path 202, the valve control outlet 204 is controlled to be closed. At the same time, an appropriate amount of the polymer substance mixture can be pushed and filled into the distribution path 302 by the control of the measurement unit 60.

  When all the desired polymeric material mixture is filled into the distribution channel 302, the polymeric material mixture is still in the molten state at the threshold temperature and has a relatively high pressure, but the interior of the mold unit 30 is relatively Is in a low pressure state. Thereafter, the three valve control outlets 204 are controlled to open simultaneously, and the high-pressure polymer material mixture enters the mold unit 30 through the three valve control outlets 204 and the correspondingly connected inlets 302 at the same time. After that, it immediately expands and fills it.

  When manufacturing a large-sized foam, it is necessary to provide many entrances in the mold to be used. In this case, in order to maintain the foaming efficiency, a plurality of 2-in-1 type kneading injection molding apparatuses are used at the same time, and each apparatus is connected to several inlets through corresponding distribution paths. May be.

  3 to 4 show a second embodiment of the present invention. For convenience of explanation, the same reference numerals are given to the same structures as those in the first embodiment, and the same descriptions are omitted. In the present embodiment, the rapid extruding part 1122 ′ is provided at the end of the injection molding stage 112 ′, so that the polymer substance mixture can be injected into the distribution path 202 of the distribution unit 20 by hydraulic pressure.

  FIG. 5 shows a third embodiment of the present invention. Here, the same reference numerals are given to the same structures as those in the above embodiment, and the same descriptions are omitted. In the present embodiment, the valve bar 80 is used as an opening / closing for controlling the inlet 302 of the mold unit 30. The valve bar 80 is provided with a through hole 802 corresponding to the inlet 302, and by moving the valve bar 80, the through hole 802 is moved to a place that is aligned with or separated from the inlet 302, thereby effectively controlling the opening and closing of the inlet 302. can do.

  From the foregoing, it can be seen that the 2-in-1 type kneading injection molding apparatus according to the present invention mainly has the following characteristics.

  1. The 2-in-1 type kneading injection molding apparatus according to the present invention has a shaft rod penetrating the inside thereof, thereby incorporating a screw portion, a mesh-like intersection portion or a unidirectional twill portion having different uses thereon, The polymer material management process can be continuously completed in the same apparatus.

  2. In the present invention, the expansion ratio can be controlled by changing the type of the polymer substance used.

  3. In the present invention, a suitable foaming effect can be obtained by using an organic or inorganic physical foaming agent.

  4). After the foaming agent and the polymer material mixture are sufficiently mixed by the temperature lowering step according to the present invention, the polymer material mixture is appropriately cooled to control the melt strength of the mixture and the foaming agent becomes invalid. You can avoid that.

  5. The distribution unit having a valve control outlet according to the present invention allows a polymer material mixture having a relatively high pressure in a molten state to enter the inside of the mold unit simultaneously through a plurality of inlets, thereby generating foaming blind spots or uneven foaming. Can be avoided, defects can be reduced to a minimum, and the yield of foamed products can be effectively improved.

The present invention also discloses a method for producing a highly foamed product using the 2-in-1 type kneading injection molding apparatus. FIG. 6 shows a flowchart of the method. As shown in the figure, this method
A1: introducing a polymer substance into the feed stage through a feed port;
A2: pressing the polymer material by transporting the polymer material into the pressing stage;
A3: dissolving the polymer substance in a molten state by transporting the polymer substance into the melting stage;
A4: a step of sufficiently kneading the molten polymer material with the physical foaming agent by transporting the polymer material into the kneading stage;
A5: transporting the polymer substance mixture sufficiently kneaded with the physical foaming agent into the temperature lowering stage to lower the temperature of the polymer substance mixture and maintaining it in a molten state;
A6: transporting the polymer material mixture into the injection molding stage to fill and fill the distribution path of the distribution unit, wherein the valve control outlet is closed;
A7: Controlling to open the valve control outlet, and filling the polymer substance mixture into the mold unit through the opened valve control outlet and the inlet of the mold unit.

  As described above, the present invention provides a granulation process through melting, kneading, cooling, and precision measurement primary molding by each element in the 2-in-1 type kneading injection molding apparatus performing its function. The process of preparing a highly foamed resin rapidly and effectively can be achieved without passing through. Also, the design of the valve control outlet of the distribution unit may avoid the occurrence of uneven foaming, reduce defects to a minimum, and effectively improve the yield of foamed products. Since the industrial utility value is extremely large, file a patent application based on the law.

  The above description and drawings are only embodiments for explaining the present invention, and those skilled in the art can make equivalent partial changes and modifications, which are also included in the technology and spirit of the present invention. is there.

DESCRIPTION OF SYMBOLS 10 Kneading extrusion unit 12 Axis center 102 Feed stage 1020 Feed port 104 Pressing stage 120 Screw part 106 Melting stage 108 Kneading stage 122 Reticulated cross part 124 Unidirectional twill part 110 Temperature reduction stage 112, 112 'Injection molding stage 1122' Rapid pressing part 20 Distribution unit 202 Distribution path 204 Valve control outlet 30 Mold unit 302 Inlet 40 Physical foaming agent supply unit 402 High-pressure gas unit 404 Gas blow-off pump unit 50 Temperature / pressure measurement unit 60 Measurement unit 70 Motor 80 Valve bar 802 Through hole

Claims (13)

A 2-in-1 type kneading injection molding apparatus for producing a highly foamed product,
A feed stage having an axis extending through the inside thereof, a feed port, and a polymer material being introduced;
A pressing step for pressing the charged polymer substance,
A melting stage that melts the pressed polymer material into a molten state by applying a high temperature;
By being connected to the physical foaming agent supply unit, the physical foaming agent is supplied to the inside, and a kneading stage for sufficiently kneading the polymer material in a molten state,
A kneading and extruding unit including a temperature lowering stage for lowering the temperature of the polymer substance mixture sufficiently kneaded with the physical foaming agent, and an injection molding stage for injection molding the temperature lowered polymer substance mixture;
Each having at least one distribution path having a valve control outlet, connected to the injection molding stage of the kneading extrusion unit, and containing a polymer substance mixture injection molded from the injection molding stage;
Having at least one inlet joined to the valve control outlet of the distribution unit, and when the valve control outlet is opened, the polymer material mixture filled in the distribution path enters the inside through the inlet A mold unit that can
2-in-1 type kneading injection molding apparatus.   2. The 2-in-1 kneading injection molding apparatus according to claim 1, wherein a screw portion is provided on a surface of an axial center inside the pressing stage and the melting stage.   3. The 2-in-1 kneading injection molding apparatus according to claim 2, wherein the ratio between the length of the shaft center in the pressing stage and the melting stage and the diameter thereof is at least 28: 1.   2. The 2-in-1 kneading injection molding apparatus according to claim 1, wherein the shaft center inside the kneading stage is provided with a plurality of mesh-like intersections on the surface.   5. The 2-in-1 kneading injection molding apparatus according to claim 4, wherein the shaft center inside the kneading stage is further provided with at least one unidirectional twill on the surface.   The shaft center inside the temperature lowering step is provided with a screw on the surface, and the shaft center inside the injection molding step is provided with at least one mesh-like intersection on the surface. An in-1 type kneading injection molding apparatus.   The 2-in-1 type kneading injection molding apparatus according to claim 6, wherein the ratio of the length of the shaft center in the temperature lowering stage to the diameter thereof is at least 8: 1.   The 2-in-1 type kneading injection molding apparatus according to claim 6, wherein at least one unidirectional twill portion is further provided on a surface of the shaft center inside the injection molding stage.   The 2-in-1 type kneading injection molding apparatus according to claim 6, wherein a quick extruding part for injecting a polymer substance mixture into the distribution unit is provided at an end of the injection molding stage.   2. The 2-in-1 kneading injection molding apparatus according to claim 1, wherein the injection molding stage is connected to a measurement unit to control the amount of the polymer substance mixture to be injection molded.   The 2-in-1 type kneading injection molding apparatus according to claim 1, wherein the physical foaming agent supply unit further includes a high-pressure gas unit and a gas blow-off pump unit.   2. The 2-in-1 type kneading injection molding according to claim 1, wherein the temperature lowering stage is connected to a temperature / pressure measuring unit in the vicinity of the injection molding stage to monitor the temperature and pressure of the polymer substance mixture. apparatus. A method of using the 2-in-1 type kneading injection molding apparatus according to claim 1,
(A1) introducing a polymer substance into the feed stage through a feed port;
(A2) pressing the polymer material by transporting the polymer material into the pressing step;
(A3) transporting the polymer material into the melting stage to dissolve the polymer material in a molten state;
(A4) a step of sufficiently kneading the molten polymer material with the physical foaming agent by transporting the polymer material into the kneading stage;
(A5) transporting the polymer substance mixture sufficiently kneaded with the physical foaming agent into the temperature lowering stage, thereby lowering the temperature of the polymer substance mixture and maintaining it in a molten state;
(A6) transporting the polymer substance mixture into the injection molding stage to be injected and filled into the distribution path of the distribution unit, wherein the valve control outlet is closed;
(A7) controlling to open the valve control outlet and filling the polymer substance mixture into the interior of the mold unit through the opened valve control outlet and the inlet of the mold unit. Method.

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