JP2004066528A - Die for reaction foaming and reaction foaming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die for reaction foaming which can continuously foam by discharging even by using an inert fluid such as a carbon dioxide, a nitrogen or the like and to provide a reaction foaming apparatus having the same. <P>SOLUTION: The die 5 for discharging two components of dissolved inert fluids reacting with each other after the components are mixed by a mixing head 4 includes a reaction channel 24 for feeding from the head 4, a manifold 27 for spreading the mixed components from the channel 24 in a widthwise direction, a discharge port 28 extended in the widthwise direction for discharging the mixed components, and a throttle 26 arranged between the reaction channel 24 and the manifold 27 for imparting a back pressure to the mixed components in the channel 24. Thus, the mixed components sufficiently dissolved in the inert fluid can be continuously discharged from the die 5, and freely foamed in good balance, and microcellular foam having fine cells can be produced continuously and efficiently. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reactive foam molding die and a reactive foam molding device, and more particularly, to a reactive foam molding die for reacting and reacting a plurality of reactive materials to form a foam, and a reactive foam molding device provided with the die.
[0002]
[Prior art]
Conventionally, for example, a reaction in which an isocyanate component and a polyol component are used as raw materials, and chlorofluorocarbon or alternative fluorocarbon is used as a foaming agent, and these are mixed at a high pressure in a mixing head, then injected, and injected into a mold while reacting. It is widely known to mold a foam such as a polyurethane foam by an injection molding method (RIM method).
[0003]
In recent years, since the use of chlorofluorocarbon and alternative fluorocarbons that cause destruction of the ozone layer has been totally abolished, carbon dioxide and nitrogen have been used as foaming agents in such foam molding instead of fluorocarbon and alternative fluorocarbons. Various proposals have been made to use an inert gas.
[0004]
[Problems to be solved by the invention]
However, in such foam molding, for example, when a sheet-like foam is molded, instead of mixing the isocyanate component and the polyol component with a mixing head and then injecting the mixture into a mold, a T-die or the like is used. It is conceivable that the liquid is continuously foamed by using the liquid to cause free foaming.
[0005]
However, when using an inert gas as a foaming agent, it is necessary to sufficiently dissolve the inert gas under a predetermined pressure in the isocyanate component and the polyol component. If the isocyanate component and the polyol component are mixed at a high pressure in the mixing head and then discharged directly from the T-die, the inert gas expands in a state where the reaction between the isocyanate component and the polyol component is not sufficient, A problem arises in that the balance of foaming is lost and a good foam cannot be formed.
[0006]
The present invention has been made in view of such a problem, and an object of the present invention is to use an inert fluid such as carbon dioxide or nitrogen, and to form a reaction by continuous foaming by discharge. An object of the present invention is to provide a foam molding die and a reaction foam molding apparatus provided with the die.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a reactive foam molding die for reacting a plurality of reactive materials to form a foam by reacting a plurality of reactive materials. And a discharge port for discharging the mixture flowing into the inflow path, and a throttle for applying pressure to the mixture in the inflow path is provided between the inflow path and the discharge port. It is characterized by being done.
[0008]
According to such a configuration, the throttle restricts the outflow of the mixture of the reactive raw material that has flowed into the inflow passage to the discharge port, so that a predetermined pressure is applied to the mixture in the inflow passage. Therefore, in the inflow path, the reaction of the mixture can be promoted while maintaining a predetermined pressure, so that the mixture discharged from the discharge port can be foamed in a well-balanced manner to form a good foam. it can.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, the discharge port is formed so as to extend in a width direction orthogonal to the inflow direction of the mixture, and the discharge port is provided with the throttle. A manifold for spreading the mixture in the width direction is provided between the discharge port and the discharge port.
[0010]
According to such a configuration, the mixture that has passed through the throttle spreads in the width direction in the manifold and is discharged from the discharge port. Therefore, the mixture can be satisfactorily discharged from the discharge port formed so as to extend in the width direction by the manifold.
[0011]
According to a third aspect of the present invention, in the second aspect of the present invention, a vertical opening length of the discharge port in a direction perpendicular to the width direction is larger than the vertical opening length of the diaphragm. It is characterized by being formed short.
[0012]
According to such a configuration, since the vertical opening length of the discharge port is formed shorter than the vertical opening length of the diaphragm, the mixture is further applied with pressure in the manifold. Therefore, even in the manifold, the reaction of the mixture can be promoted while maintaining a predetermined pressure, so that the mixture discharged from the discharge port is further foamed in a well-balanced manner to form a good foam. can do.
[0013]
According to a fourth aspect of the present invention, in the second aspect of the present invention, the inflow section in which the inflow path is formed and the discharge section in which the discharge port and the manifold are formed are formed so as to be separable. And the aperture is formed in the discharge section.
[0014]
According to such a configuration, the inflow portion and the discharge portion are formed so as to be dividable, so that the inflow portion has a length that can provide an optimal pressure application time according to the type of the reactive raw material and other molding conditions. An inlet with a passage can be connected to the outlet. Therefore, regardless of the type of the reactive raw material and other molding conditions, the mixture discharged from the discharge port can be foamed in a well-balanced manner to form a good foam.
[0015]
The invention according to claim 5 is a reactive foam molding apparatus, wherein a raw material supply means for supplying a reactive raw material, an inert fluid supply means for supplying an inert fluid, and a reaction supplied by the raw material supply means. A premixing means for premixing the inert fluid supplied by the inert fluid supply means with the inert raw material, and a reactive raw material in which the inert fluid is premixed by the premixing means. A plurality of raw material preparing means having a dissolving means for dissolving the active fluid; a mixing means for mixing the reactive raw material in which the inert fluid prepared by each of the raw material preparing means is dissolved; and A die for discharging the mixture of reactive raw materials, wherein the die discharges the mixture flowing into the inflow passage into which the mixture of reactive raw materials flows. An outlet, wherein between the inlet passage and the discharge port is characterized in that a diaphragm for applying a pressure is provided to the mixture of the inflow path.
[0016]
According to such a configuration, in each raw material preparation means, the reactive raw material is supplied from the raw material supply means, the inert fluid is supplied from the inert fluid supply means, and after these are mixed in the premixing means, the dissolving means Thereby, the inert fluid is dissolved in the reactive raw material. Next, the reactive raw material in which the inert fluid prepared by each raw material preparation unit is dissolved is mixed by the mixing unit, and then discharged from the die.
[0017]
Then, in the die, the throttle restricts the outflow of the mixture of the reactive raw materials flowing into the inflow passage to the discharge port, so that a predetermined pressure is applied to the mixture in the inflow passage. Therefore, in the inflow path, the reaction of the mixture can be promoted while maintaining the predetermined pressure and dissolving the inert fluid, so that the mixture discharged from the discharge port is foamed in a well-balanced manner. Good foam can be formed.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic configuration diagram showing one embodiment of a reactive foam molding apparatus provided with the reactive foam molding die of the present invention.
[0019]
In FIG. 1, the reactive foam molding apparatus 1 is a reactive foam molding apparatus for continuously reacting two types of reactive materials to foam and form a microcellular foam, and comprises a first reactive material ( Hereinafter, a first raw material component), a first preparation unit 2 as a raw material preparation unit for supplying the second reactive raw material (hereinafter, referred to as a second raw material component). And a mixing head 4 and a die 5 as mixing means.
[0020]
The first preparation unit 2 and the second preparation unit 3 have substantially the same device configuration. The first preparation unit 2 includes a first raw material tank 6, a first raw material supply pump 8 as raw material supply means, a first inert fluid tank 10, a first inert fluid supply pump 12 as inert fluid supply means, A first pre-mixing unit 14 as mixing means and a first high-pressure heater 16 as melting means are provided.
[0021]
The second preparation unit 3 includes a second raw material tank 7, a second raw material supply pump 9 as raw material supply means, a second inert fluid tank 11, and a second inert fluid supply pump 13 as inert fluid supply means. A second premixing unit 15 as a premixing means, and a second high-pressure heater 17 as a dissolving means.
[0022]
Reactive raw materials that react with each other are stored in the first raw material tank 6 and the second raw material tank 7. For example, when microcellular polyurethane foam is foam-formed, the first raw material tank 6 contains polystyrene. A first raw material component such as an isocyanate compound is stored, and a second raw material tank 7 stores a second raw material component such as a polyol compound.
[0023]
The first raw material supply pump 8 is connected to the downstream side of the first raw material tank 6, and is configured to transport the first raw material component to the first premixing unit 14 at a predetermined amount and a predetermined pressure.
[0024]
The second raw material supply pump 9 is connected to the downstream side of the second raw material tank 7 and is configured to transport the second raw material component to the second premixing unit 15 at a predetermined amount and a predetermined pressure.
[0025]
An inert fluid such as carbon dioxide or nitrogen is stored in each of the first inert fluid tank 10 and the second inert fluid tank 11, and a first inert fluid tank is connected to a downstream side of the first inert fluid tank 10. The inert fluid supply pump 12 is configured to transport the inert fluid in the first inert fluid tank 10 to the first premixing unit 14 at a predetermined amount and a predetermined pressure. A second inert fluid supply pump 13 connected to the downstream side of the first inert fluid supply unit 11 transports the inert fluid in the second inert fluid tank 11 to the second premixing unit 15 at a predetermined amount and a predetermined pressure. Is configured.
[0026]
The first premixing unit 14 is connected to the first raw material supply pump 8 and the first inert fluid supply pump 12 on the downstream side thereof, respectively. The raw material component and the inert fluid supplied from the first inert fluid supply pump 12 are continuously premixed. More specifically, in the first premixing unit 14, the first raw material component supplied at a predetermined pressure from the first raw material supply pump 8 and the first raw material component supplied from the first inert fluid supply pump 12 at a predetermined pressure are used. The active fluid is configured to be physically impinged and continuously premixed at a predetermined ratio determined in each case.
[0027]
The second premixing unit 15 is connected to the second raw material supply pump 9 and the second inert fluid supply pump 13 on the downstream side thereof, respectively. The raw material component and the inert fluid supplied from the second inert fluid supply pump 13 are continuously premixed. More specifically, in the second premixing unit 15, the second raw material component supplied at a predetermined pressure from the second raw material supply pump 9 and the second raw material component supplied at a predetermined pressure from the second inert fluid supply pump 13 are used. The active fluid is configured to be physically impinged and continuously premixed at a predetermined ratio determined in each case.
[0028]
The first high-pressure heater 16 is connected to the downstream side of the first premixing unit 14, and in the first raw material component in which the inert fluid is premixed by the first mixing unit 14, the first high pressure heater 16 is inert to the first raw material component. It is configured to dissolve the fluid. More specifically, the first high-pressure heater 16 is provided with a heater around a pressure-resistant pipe, passes a mixture of the first raw material component and the inert fluid through the pressure-resistant pipe, and pressurizes the mixture as it is ( By heating with a heater while maintaining pressure, the inert fluid is continuously dissolved in the first raw material component.
[0029]
The second high-pressure heater 17 is connected to the downstream side of the second premixing unit 15, and in the second raw material component in which the inert fluid is premixed by the second mixing unit 15, the second raw material component is inert to the second raw material component. It is configured to dissolve the fluid. More specifically, the second high-pressure heater 17 is provided with a heater around a pressure-resistant pipe, passes a mixture of the second raw material component and the inert fluid through the pressure-resistant pipe, and pressurizes the mixture as it is ( By heating with a heater as needed while maintaining the pressure, the inert fluid is continuously dissolved in the second raw material component.
[0030]
In the first preparation unit 2, first, the first raw material component stored in the first raw material tank 6 is firstly mixed by the first raw material supply pump 8 at a pressure of, for example, 10 to 30 MPa into the first premixing unit. 14, and at the same time, the inert fluid stored in the first inert fluid tank 10 is supplied to the first premixing unit by the first inert fluid supply pump 12 at a pressure of, for example, 10 to 30 MPa. 14. As a result, the first raw material component and the inert fluid are supplied to the first premixing unit 14 at a high pressure. In addition, it is preferable to adjust the mixing pressure in the first preliminary mixing unit 14 to be 10 to 30 MPa.
[0031]
After the first raw material component and the inert fluid thus supplied are continuously premixed in the first premixing unit 14, the first raw material component and the inert fluid are then supplied to the first high-pressure heater 16. The inert fluid is continuously dissolved in the first raw material component by pressurizing (holding pressure) and / or heating the mixture. The conditions for dissolving the inert fluid in the first raw material component are, as long as the inert fluid can be sufficiently dissolved in the first raw material component, preferably, if it can be substantially completely dissolved, There is no limitation, and it may be appropriately adjusted according to the purpose and use. For example, it is preferable that the melting temperature is 5 to 30 MPa and 1 to 500 seconds, and the dissolving temperature is 30 to 100 ° C.
[0032]
In the second preparation unit 3, first, the second raw material component stored in the second raw material tank 7 is supplied to the second premixing unit 9 by the second raw material supply pump 9 at a pressure of, for example, 10 to 30 MPa. 15 and at the same time, the inert fluid stored in the second inert fluid tank 11 is supplied to the second premixing unit by the second inert fluid supply pump 13 at a pressure of, for example, 10 to 30 MPa. 15 As a result, the second raw material component and the inert fluid are supplied to the second premixing unit 15 at a high pressure. In addition, it is preferable to adjust the mixing pressure in the second premixing unit 15 to be 10 to 30 MPa.
[0033]
After the thus-supplied second raw material component and the inert fluid are continuously premixed in the second premixing unit 15, the second raw material component and the inert fluid are then supplied to the second high-pressure heater 17. The inert fluid is continuously dissolved in the second raw material component by pressurizing (holding pressure) and / or heating the mixture. The conditions for dissolving the inert fluid in the second raw material component are, as long as the inert fluid can be sufficiently dissolved in the second raw material component, preferably, if the inert fluid can be substantially completely dissolved, There is no limitation, and it may be appropriately adjusted according to the purpose and use. For example, it is preferable that the melting temperature is 5 to 30 MPa and 1 to 500 seconds, and the dissolving temperature is 30 to 100 ° C.
[0034]
In the reaction foam molding apparatus 1, the first raw material component (hereinafter, referred to as a first prepared component) in which the inert fluid prepared by the first preparing unit 2 is dissolved, and the second preparing unit 3 prepares the raw material component. The second raw material component (hereinafter, referred to as a second preparation component) in which the inert fluid is dissolved is mixed in a mixing head 4 described below, and injected into a die 5 while reacting. Foam molding.
[0035]
The mixing head 4 is connected to the first high-pressure heater 16 and the second high-pressure heater 17 on the downstream side of the first high-pressure heater 16 and the second high-pressure heater 17. It is configured so that the prepared components are mixed and injected into the die 5.
[0036]
More specifically, as shown in FIG. 2, the mixing head 4 includes a first pentagonal head body 18 having a substantially rectangular upper part and a substantially trapezoidal lower part in a front view, and A first inflow path 19 into which the preparation component flows, a second inflow path 20 into which the second preparation component flows, and a mixing flow path 21 for mixing the first preparation component and the second preparation component are formed.
[0037]
In the following description, for convenience, the upper side of the paper of FIG. 2 is the upper side of the mixing head 4 and the die 5, and the lower side of the paper is the lower side of the mixing head 4 and the die 5.
[0038]
The upstream end of the first inflow path 19 is open at one side of the upper surface of the head body 18 and is connected to the first high-pressure heater 16. The mixing channel 21 is bent so that its downstream end is connected to the upstream end of the mixing channel 21. A first inflow connection passage 22 having a smaller opening cross-sectional area than the first inflow passage 19 and the upstream end of the mixing flow passage 21 is formed between the downstream end of the first inflow passage 19 and the upstream end of the mixing flow passage 21. The first inflow connection channel 22 limits the inflow of the first preparation component flowing into the mixing channel 21 from the first inflow channel 19 to a constant amount, and maintains the pressure in the mixing channel 21. I have.
[0039]
The upstream end of the second inflow passage 20 is open at the other side of the upper surface of the head main body 18 and is connected to the second high-pressure heater 17. The mixing channel 21 is bent so that its downstream end is connected to the upstream end of the mixing channel 21. A second inflow connection channel 23 having a smaller opening cross-sectional area is formed between the downstream end of the second inflow channel 20 and the upstream end of the mixing channel 21 so as to communicate therewith. The second inflow connection passage 23 restricts the inflow of the second preparation component flowing from the second inflow passage 20 into the mixing channel 21 to a constant amount, and maintains the pressure in the mixing channel 21. I have.
[0040]
The mixing channel 21 is formed along the vertical direction at the center of the head main body 18, the downstream end thereof is opened at the lower surface of the head main body 18 and connected to the die 5, and the upstream end thereof is connected to the head 5. A first inflow connection channel 22 and a second inflow connection channel 23 are formed on the inner peripheral side surface near the upstream end thereof so as to face each other in the vertical direction at the center of the main body 18. Have been.
[0041]
Then, in the mixing head 4, the first preparation component transported from the first high-pressure heater 16 flows into the first inflow path 19, and then the first preparation component flows through the first inflow connection path 22. The mixture flows into the mixing channel 21 at a predetermined flow rate. Further, the second preparation component transported from the second high-pressure heater 17 flows into the second inflow passage 20, and then the second preparation component is supplied to the mixing flow passage 21 via the second inflow connection passage 23. Inflow rate. In the mixing channel 21, at the upstream end, the first inflow connection channel 22 and the second inflow connection channel 23 are formed so as to face each other so as to face each other. The first preparation component flowing into the mixing flow path 21 from the first preparation component and the second preparation component flowing into the mixing flow path 21 from the second inflow connection path 23 are collision-mixed in an opposed manner, and the first preparation component and the second preparation component are mixed. A mixture with the prepared components (hereinafter, referred to as a mixed component) flows toward the downstream end thereof while reacting with each other, and flows toward the die 5.
[0042]
Although not shown, the mixing head 4 is provided with an openable / closable gate in the mixing flow path 21, and the first inflow connection path 22 and the second inflow connection path 23 The opening facing the mixing flow path 21 is closed, and the opening facing the mixing flow path 21 in the first inflow connection path 22 and the second inflow connection path 23 is opened by retreating the open / close gate. I have.
[0043]
The die 5 includes a reaction section 25 as an inflow section in which a reaction flow path 24 as an inflow path is formed, and a discharge section 29 in which a throttle 26, a manifold 27, and a discharge port 28 are formed. The reaction part 25 and the discharge part 29 are formed in a character shape so that they can be divided.
[0044]
In the reaction section 25, a reaction flow path 24 is formed so as to penetrate in a vertical direction at a central portion of a reaction section main body 30 formed in a substantially rectangular shape. The reaction channel 24 is formed with substantially the same opening cross-sectional area as the mixing channel 21 of the mixing head 4, and its upstream end is connected to the mixing channel 21 of the mixing head 4, and The side end is connected to the throttle 26 of the discharge unit 29. The reaction section 25 is appropriately provided with a reaction channel 24 having a length according to the type (reactivity) of the mixed component and other forming conditions.
[0045]
As shown in FIG. 3, the discharge unit 29 includes a lower member 31 formed in a substantially elongated and substantially rectangular shape, and an upper member 32 formed in a substantially elongated and substantially rectangular shape. It is constituted by joining.
[0046]
As shown in FIG. 4, the lower member 31 has a throttle groove 33, a manifold groove 34, and a discharge groove 35 formed on the back surface (that is, the inner surface joined to the upper member 32).
[0047]
The throttle groove 33 is formed on the upper side of the center in the longitudinal direction of the lower member 31, and includes a lower inlet groove 36 and an inflow guide groove 37. The lower inflow groove 36 has a semiconical shape having a substantially semicircular shape in a rear view and a triangular shape in a side sectional view (see FIG. 6), and has a groove depth from the upper side to the lower side as shown in FIG. 6. Are formed so as to gradually become shallower. The lower inlet groove 36 is formed such that its upper end is opened from the upper surface of the lower member 31 and its lower end communicates with the manifold groove 34.
[0048]
As shown in FIG. 4, the inflow guide groove 37 has a substantially triangular shape in rear view, and is formed symmetrically on both longitudinal sides from the lower inflow groove 36. Each of the inflow guide grooves 37 has a groove depth shallower from the upper side to the lower side than the lower inflow groove 36 (more specifically, the lower side where the groove depth gradually decreases from the upper side to the lower side). The groove depth is substantially the same as the groove depth at the lower end of the inlet groove 36, and is formed so as to gradually spread from the lower inlet groove 36 in the rear view at the same groove depth. Further, each of the inflow guide grooves 37 is formed such that an upper end thereof is opened from an upper surface of the lower member 31 and a lower end thereof communicates with the manifold groove 34 in a state where the inflow guide grooves 37 communicate with the respective side ends of the lower inflow groove 36. ing.
[0049]
The manifold groove 34 is formed at the center in the vertical direction of the lower member 31 and has a substantially semicircular cross section as shown in FIG. 6, and as shown in FIG. It is formed in a substantially elongated and substantially rectangular shape so as to extend in a width direction orthogonal to the inflow direction of the mixed component.
[0050]
The discharge groove 35 is formed on the lower side of the lower member 31 and has the same groove depth, which is shallower than the inflow guide groove 37 as shown in FIG. 6 and is parallel to the manifold groove 34 as shown in FIG. , And extends in the longitudinal direction of the discharge portion 29, that is, the width direction orthogonal to the inflow direction of the mixed component, and is formed in a substantially elongated substantially rectangular shape slightly shorter than the width direction of the manifold groove 34. The discharge groove 35 is formed such that its upper end communicates with the manifold groove 34 and its lower end is opened from the lower surface of the lower member 31.
[0051]
As shown in FIG. 5, the upper member 32 has an upper inlet groove 38 formed on the back surface (that is, the inner surface joined to the lower member 31).
[0052]
The upper inlet groove 38 is formed above the center of the upper member 32 in the longitudinal direction of the upper member 32 so as to face the lower inlet groove 36 of the throttle groove 33 when the lower member 31 and the upper member 32 are joined. It has a semi-conical shape having a substantially semi-circular shape and a triangular shape (see FIG. 6) when viewed from the side, and as shown in FIG. 6, is formed so that the groove depth gradually decreases from the upper side to the lower side. I have. The upper inflow groove 38 is formed such that the upper end is opened from the upper surface of the upper member 32. The rear surface of the upper member 32 is formed flush except for the portion where the upper inlet groove 38 is formed.
[0053]
Then, as shown in FIG. 6, the discharge section 29 is formed by overlapping and joining the lower member 31 and the upper member 32.
[0054]
That is, by joining the lower member 31 and the upper member 32, the lower inlet groove 36 and the upper inlet groove 38 face each other, and as shown in FIG. As shown in FIG. 6, a conical inlet 39 is formed in which the cross-sectional area of the opening gradually decreases from the upper side to the lower side. Further, the inflow guide groove 37 and the back surface of the upper member 32, which is flush with each other, face each other, and from the upper side to the lower side, the opening cross-sectional areas are substantially equal as shown in FIG. 6, and as shown in FIG. Then, an inflow guide portion 40 that gradually widens from both sides of the inflow portion 39 toward the manifold 27 is formed. Then, the throttle 26 is formed by the inflow port 39 and the inflow guide 40.
[0055]
Further, the manifold groove 34 and the back surface of the upper member 32, which is flush with each other, face each other and have a substantially semicircular cross-section as shown in FIG. A substantially elongated substantially rectangular manifold 27 extending is formed.
[0056]
The discharge groove 35 faces the back surface of the upper member 32, which is flush with the upper surface of the upper member 32. As shown in FIG. A substantially narrow and substantially rectangular discharge port 28 is formed to be shorter than the vertical opening length X2 of the inflow guide part 40 and extends in the width direction in a range shorter than the manifold 27 as shown in FIG. Is done.
[0057]
Thereby, the mixed component flowing from the mixing head 4 to the die 5 first flows into the reaction channel 24 of the reaction unit 25, as shown in FIG. In the die 5, in the throttle 26 of the discharge unit 29, the opening cross-sectional area of the downstream end of the inflow port 39 and the opening cross-sectional area of the inflow guide 40 are smaller than the opening cross-sectional area of the reaction channel 24. Since the mixture is formed, the flow of the mixed component flowing into the reaction channel 24 to the manifold 27 is restricted by the throttle 26, so that a back pressure is applied to the mixed component in the reaction channel 24. Therefore, in the reaction channel 24, the reaction of the mixed components can be promoted while maintaining the back pressure and dissolving the inert fluid. Therefore, the mixed components can form fine nuclei of bubbles in the reaction channel 24 while reacting.
[0058]
Next, the mixed component flowing out of the reaction channel 24 flows into the manifold 27 while the flow is restricted by the throttle 26. In the throttle 26, since the inflow port 39 is formed in a substantially conical shape, the outflow of the mixed component can be restricted gradually, and at the same time, the inflow guide 40 is connected to the manifold from both sides of the inflow port 39. Since it is formed so as to gradually expand toward 27, it can flow out widely in the width direction of the manifold 27. Therefore, the flow of the mixed component from the reaction channel 24 can be widened in the width direction of the manifold 27 while being smoothly restricted by the throttle 26.
[0059]
Then, the mixed component that has passed through the throttle 26 and flowed into the manifold 27 spreads in the width direction in the manifold 27, and then is discharged well from the discharge port 28. In the manifold 27, the mixed component smoothly flows in the width direction in the manifold groove 34 formed in a substantially semicircular side cross section. In the die 5, the opening cross section of the discharge port 28 (perpendicular to the width direction). Since the vertical opening length X1) is formed smaller (shorter) than the opening cross-sectional area (vertical opening length X2) of the inflow guide portion 40 of the throttle 26, the mixing in the manifold 27 is performed. Further back pressure is applied to the components. Therefore, even in the manifold 27, the reaction of the mixed component can be promoted while maintaining the back pressure, and the formation and growth of fine bubble nuclei in the mixed component can be further improved.
[0060]
Then, the mixed component discharged from the discharge port 28 over the entire width direction of the discharge port 28 releases the back pressure applied in the die 5 at a stretch, so that the inert fluid expands while further reacting. Foam molding. In such foam molding, since the mixed components have sufficiently formed and grown the nuclei of bubbles in the die 5, they can be foamed in a well-balanced manner to form a good foam.
[0061]
Therefore, in such a reactive foam molding apparatus 1, the mixed component in which the inert fluid is sufficiently dissolved can be continuously discharged from the die 5, and can be free-foamed in a well-balanced manner. Therefore, microcellular foam having fine cells having a cell diameter of, for example, 100 μm or less, preferably 30 μm can be continuously and efficiently produced by free foaming.
[0062]
Further, in the die 5, the reaction part 25 in which the reaction channel 24 is formed and the discharge part 29 in which the throttle 26, the manifold 27 and the discharge port 28 are formed are formed so as to be separable, so that the mixed component is formed. The reaction section 25 in which the reaction channel 24 having a length that can provide the optimum pressure application time can be connected to the discharge section 29 in accordance with the type of the resin and other molding conditions. Therefore, regardless of the type of the mixed component and other molding conditions, the mixed component discharged from the discharge port 28 can be foamed in a well-balanced manner to form a favorable foam.
[0063]
In the above description, the reaction foam molding apparatus 1 and the die 5 are shown to be applicable to the formation of microcellular polyurethane foam. However, the reaction foam molding apparatus and the die of the present invention are not limited to this, and may include plural components. Can be widely applied as long as it is a foam that can be obtained by reacting the same, for example, a polyamide resin foam, a dicyclopentadiene resin foam, an unsaturated polyester resin foam, Acrylamate resin foam, epoxy resin foam and the like are exemplified.
[0064]
【The invention's effect】
As described above, according to the first aspect of the present invention, in the inflow path, the reaction of the mixture can be promoted while maintaining the predetermined pressure. It is possible to form a good foam by foaming in a well-balanced manner.
[0065]
According to the second aspect of the present invention, the mixture can be satisfactorily discharged from the discharge port formed so as to extend in the width direction by the manifold.
[0066]
According to the third aspect of the present invention, the reaction of the mixture can be promoted in the manifold while maintaining a predetermined pressure, so that the mixture discharged from the discharge port can be further foamed in a well-balanced manner. Thus, a good foam can be formed.
[0067]
According to the invention described in claim 4, regardless of the type of the reactive raw material and other molding conditions, the mixture discharged from the discharge port can be foamed in a well-balanced manner to form a good foam. it can.
[0068]
According to the invention as set forth in claim 5, the reaction of the mixture can be promoted in the inflow path while maintaining the predetermined pressure and dissolving the inert fluid, and thus the mixture is discharged from the discharge port. The mixture can be foamed in a well-balanced manner to form a good foam.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing one embodiment of a reactive foam molding apparatus provided with a reactive foam molding die of the present invention.
FIG. 2 is a front view of a mixing head and a die of the reactive foam molding apparatus shown in FIG.
FIG. 3 is a plan view of a discharge unit of the die shown in FIG.
FIG. 4 is a rear view of a lower member of the discharge unit shown in FIG. 3;
FIG. 5 is a rear view of an upper member of the discharge unit shown in FIG.
FIG. 6 is an enlarged side sectional view of a discharge unit shown in FIG. 3;
[Explanation of symbols]
1 Reactive foam molding equipment
2 First preparation section
3 Second preparation section
4 Mixing head
5 die
8 First raw material supply pump
9 Second raw material supply pump
12 First inert fluid supply pump
13 Second inert fluid supply pump
14 1st premixing unit
15 Second premixing unit
16 1st high pressure heater
17 1st high pressure heater
24 Reaction channel
25 Reaction section
26 Aperture
27 Manifold
28 Discharge port
29 Discharge section
X1 Vertical opening length of discharge port
X2 Vertical opening length of inflow guide

Claims (5)

A reactive foam molding die for foaming by reacting a plurality of reactive raw materials,
An inflow path into which the mixture of the reactive raw materials flows, and an outlet for discharging the mixture flowing into the inflow path,
A die for reactive foam molding, wherein a throttle for applying pressure to the mixture in the inflow path is provided between the inflow path and the discharge port. The discharge port is formed so as to extend in a width direction orthogonal to the inflow direction of the mixture,
The reaction foam molding die according to claim 1, wherein a manifold for spreading the mixture in a width direction is provided between the throttle and the discharge port. 3. The reactive foam molding according to claim 2, wherein a vertical opening length of the discharge port in a direction perpendicular to the width direction is formed shorter than the vertical opening length of the diaphragm. 4. For die. The inflow portion where the inflow path is formed, and the discharge portion where the discharge port and the manifold are formed, are formed so as to be dividable,
3. The reactive foam molding die according to claim 2, wherein the throttle is formed in the discharge unit. 4. Raw material supply means for supplying a reactive raw material,
Inert fluid supply means for supplying an inert fluid,
Premixing means for premixing the inert fluid supplied by the inert fluid supply means with the reactive raw material supplied by the raw material supply means, and
By the premixing means, in the reactive raw material in which the inert fluid is premixed, a plurality of raw material preparation means including dissolving means for dissolving the inert fluid in the reactive raw material,
Mixing means for mixing the reactive raw material in which the inert fluid prepared by each of the raw material preparation means is dissolved,
A die for discharging a mixture of reactive raw materials mixed by the mixing means,
The die is
An inflow path into which the mixture of the reactive raw materials flows, and an outlet for discharging the mixture flowing into the inflow path,
A reactive foam molding apparatus, wherein a throttle for applying pressure to the mixture in the inflow path is provided between the inflow path and the discharge port.

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