JPS604767B2 - Method and device for discharging liquid synthetic resin raw materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for discharging liquid synthetic resin raw materials, such as polyurethane foam raw materials whose viscosity and volume rapidly change upon reaction, uniformly and without scattering.

Conventionally, when manufacturing composite panels or foams filled with polyurethane foam in a molded manner, spraying methods and injection methods have generally been used.

However, when the foam raw material is sprayed into the recess B of the metal plate A as shown in FIG. 1 using the spray method, the spray area (indicated by L in FIG.
(1) Because it is sprayed under high pressure, products during the reaction of the polyurethane foam raw materials are suspended in the form of mist, which is very bad in terms of safety and health. (2) The spray pattern is most common at the shortest distance between the nozzle and the discharge surface (in the center) and decreases as the distance from there increases, resulting in a so-called mountain-like stacked layer, making it impossible to spray uniformly. ■Because it is sprayed under high pressure, there is a large amount of scattering. It should be noted that spraying is carried out at high pressure because low pressure causes insufficient mixing and adversely affects the reaction time and physical properties. ■
Small amount of spray, foam, so-called thin wall e.g. 10-5
It is not possible to spray to form a proboscis form.
Furthermore, in the injection method, (1) discharge is linear. ■The amount of injection is large. ■There is no scattering. ■The foam is thick. (2) In order to uniformly discharge and distribute the foam raw material over a wide width (approximately 20 to 30 degrees), consideration may be given to the necessity of traversing or arranging a plurality of discharge ports. In other words, it is unsuitable for forming thin forms (approximately 10 to 20 sides, 5 broadsides or less), and for wide widths, traversing or arranging multiple discharge ports is difficult, but it is difficult to form a uniformly distributed structure. It's hard. During traverse, the foam material may not be discharged into the area without waste. In order to eliminate these drawbacks, the present invention first reduces the pressure of the foam raw material that is sprayed at high pressure, uses the reduced pressure to pump the raw material itself, and changes its direction at the outlet to achieve further mixing. To provide a method and apparatus for discharging raw materials for synthetic resin foam such as polyurethane foam, which can be discharged in a film-like manner.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for discharging a liquid synthetic resin raw material and an apparatus therefor according to the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a longitudinal cross-sectional view of the above-mentioned apparatus, showing, for example, a case in which polyurethane foam raw material is discharged into a concave portion of a moving metal plate as shown in FIG. 1 at a constant speed. 1 is a spray gun, for example of airless type, which sprays the above raw materials at high pressure (approximately 1
0 to 100k9/ground) and sprays at a rate of about 9k9/min.

2 and 3 are raw material circulation systems, circulation system 2 is for polyol;
Circulation system 3 is used for polyisocyanate.

4 is an on-off valve, 5 is a drive mechanism for opening and closing the valve, and 6 is a nozzle on the 2-5 side? It is formed to have an aperture of about d.

Note that this aperture diameter d varies greatly depending on the spray amount and pressure, regardless of the example. 7 is a hollow body with a nozzle diameter d,
It is formed in a hollow part 8 with a larger diameter, has a nozzle mounting structure at the upper end inlet, has an inclined opening 10 at the lower end outlet 9, and has the inlet and outlet 9 in a straight line.

More specifically, the hollow body 7 mixes the mist, foam, and partially liquid spray sprayed at high pressure from the nozzle, significantly reduces the spray pressure, and fills the hollow part 8 with the spray. It has a length 1 that allows the raw material sprayed in a turbulent flow from the nozzle 6 to be laminarized and discharged by the spray pressure and its liquid pressure. This is because the liquid is discharged from the outlet 9 under equal pressure. Further, the entrance 10 is formed at an angle 8 to change the flow direction of the laminar flow relative to the flow direction of the spray material, ie, the so-called maricenter 10 of the hollow portion 8 . Note that the angle 8 is relative to the hollow diameter d and the pressure. Depending on the relationship, the cross section will be as shown in FIG. 3, for example. An example of this angle 8 is approximately 300,600. Further, the female end 10a on the axis side of the hollow portion 8 of the opening □10 controls the range from which the mixed raw material is discharged. For example, Figure 4a
As shown in FIG. 4, when 10a starts from the center of the hollow part 8 from s=o, it is theoretically possible to discharge within a range of 180 degrees, and as the eccentricity, so-called s, increases, the discharge range increases as shown in FIG. The range is narrow as shown in c. Of course, in reality, it is ejected at a narrow angle due to viscosity and other resistance. 11 is a collision plate and is a collision plane 1 formed into a mirror surface.
1a, collides with the raw material pumped in laminar flow from the hollow body 7, reduces the pressure again, changes direction, and discharges the raw material in the form of a film.

The size of this collision plate varies depending on the pressure of the collision, and
It is also related to the discharge range. Further, the discharge surface for discharging the material in the form of a film is formed at an acute angle in order to at least prevent the raw material from going around to the back side. Of course, a thin plate may be used as long as the collision plate does not vibrate or deform due to the pressure of layer sulfurization. Reference numeral 12 denotes a mounting part for removably mounting the hollow body 7 and the collision plate 11.

Next, the manufacturing method will be explained.

First, the nozzle 6 of the spray gun 1 is arranged perpendicularly to the foam material discharge surface B of the metal plate A. The inlet of the hollow body 7 is connected to this nozzle end, and the collision plate I1 is attached to the lower end thereof so as to be perpendicular to it as shown in FIG. Further, it is assumed that the metal plate A is continuously moving in the direction of the arrow at a speed of 30 m/min. For example, the foam thickness is 15, the discharge rate is 1.5k9/min, the spray pressure is 30k9/ground, d
, = 2 sails? , also = 8 ribs, 1 = 10 yards, a, = 600
, 82=150, H=300, 'SEC' of the velocity of 4.4 when the raw material discharged in film form leaves the collision plate,
S = 0.8 side, = 30㎇ Liquid temperature of A liquid and B liquid 20q0
shall be. Now, when valve 6 moves upward, liquid A and B
The liquid is sprayed from the nozzle 6 simultaneously with mixing.
The sprayed mixture is sprayed into the hollow part 8 of the hollow body 7 and at the same time is reduced due to its large volume. Moreover, since the reaction starts, the viscosity increases, and the mixture is successively fed from above. As a result, the hollow space is immediately filled with the mixture. Then, the turbulent flow is laminarized by the pressure of the spray nozzle at a position slightly below the nozzle machine in the hollow part, and the spray pressure is also applied, so that it continuously collides with the collision plate 11 with hydraulic pressure. It is discharged from the closing port 10 in the form of a film. The theoretical reason why the material is discharged in the form of a film is not clear, but at the closing port 10, it becomes a laminar flow and is discharged onto the mirror surface with a constant pressure, and the relative balance between viscosity and pressure is also added, so that the raw material becomes a mist. Instead, it becomes a thin film, a so-called film, and is discharged from the edge of the collision plate in the horizontal direction at an initial velocity Vo=4.4 kites/SEC. Then, it is discharged onto the metal plate A into the recess B as shown by the dashed line. This becomes the pattern shown in FIG. 5 on metal plate A. This arc-shaped locus is the concave B with the metal plate A.
is formed. It should be noted that approximately I
The range of the Q layer is completely film-like, and the viscosity increases due to rapid reactions during discharge, etc. On the metal slope, the layer is not completely film-like, but has some spaces as shown in Figure 5. It becomes a discharged pattern. However, this is a very favorable result in this case. That is, in the case of polyurethane, if it is discharged during the cream time and falls and adheres during the gel time, where viscosity and self-adhesiveness increase, it will adhere well to the metal plate and will not peel off later. Of course, if the moving speed of the metal plate is slowed down, the metal plate will move completely in the pattern shown in FIG. 5, and the aluminum foil 13 will be laminated thereon. Upper and lower endless belts 14 facing each other with a certain interval
, 15. It is flooded and pressurized during this interval to obtain a composite panel of constant (15 skin thickness). When this panel was cut and observed, it was found that the foam structure (bubbles) was uniform because the ingredients were sufficiently mixed, and the density was uniform because the foam was discharged uniformly. In other words, a small amount of raw material was efficiently foamed to a predetermined thickness. In addition, there were no scattered raw materials on the edge of the metal plate, and no floating of the mixture was observed in the working environment, so the raw materials were used effectively. What has been described above is only one example of the method for discharging the liquid synthetic resin raw material according to the present invention. For example, as shown in FIG.
It is also possible to discharge the mixed raw materials by discharging them onto the discharge surface over a short distance from the entrance.

Further, as liquid synthetic resin raw materials, phenol foam, epoxy foam, urea foam, polyisocyanurate foam, etc. can be similarly discharged. As described above, the discharging method and device according to the present invention have the feature that synthetic resin raw materials that rapidly undergo chemical reactions can be uniformly distributed within a predetermined wide width.

In addition, since the discharged material is in the form of a film, fine particles of the mixture do not float in the working environment and are not scattered outside a predetermined range, which has great advantages in terms of work efficiency, yield, and safety and health. Furthermore, since the above-mentioned raw materials can be uniformly dispersed even in a small amount, a thin form and a wide width can be formed.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of, for example, a metal plate from which a liquid synthetic resin raw material is to be discharged, FIG. 2 is a longitudinal cross-sectional view for explaining the discharge method and apparatus according to the present invention, and FIG. An explanatory diagram showing a cross section of a sekiguchi which is a part of the device according to the invention, FIGS. 4 a, b and c are explanatory diagrams showing an example of a discharge state, and FIG. 5 shows an example of a pattern discharged according to the present invention. An explanatory diagram, FIG. 6, is an explanatory diagram showing another embodiment. 1... Spray gun, 6... Nozzle, 7... Hollow body, 8
...Hollow part, 10...Sekiguchi, 11...
...Collision plate. O wind O 2 Fig. O 3 Fig. 4 Fig. 5 Fig. O 6 ■

Claims (1)

[Claims] 1. Injecting a liquid synthetic resin raw material at high pressure while mixing it into a hollow body, reducing the injection pressure in the hollow body and mixing it,
A method for discharging a liquid synthetic resin raw material, characterized in that the laminar flow is made into a laminar flow by force-feeding, and the laminar flow collides with a planar mirror surface to discharge a mixed liquid in the form of a film. 2. A method for discharging a liquid synthetic resin raw material according to claim 1, in which a laminar flow collides perpendicularly with a mirror surface. 3. A method for discharging a liquid synthetic resin raw material according to claims 1 and 2, wherein the liquid synthetic resin raw material is composed of polyurethane foam, polyisocyanurate foam, phenol foam, urea foam, epoxy foam, etc. 4. A method for discharging a liquid synthetic resin raw material according to claims 1 to 3, in which the liquid synthetic resin raw material is injected into a hollow body under high pressure in the form of a liquid, mist, or foam. . 5. A hollow body in which a spray gun that injects a liquid synthetic resin raw material, an inlet that is at least larger than the nozzle diameter of the spray gun, and an outlet that has an opening inclined with respect to the flow direction of the raw material are connected by a linear hollow part. and a device for discharging liquid synthetic resin raw material, characterized in that a collision plate having a flat mirror surface is removably firmly fixed to the outlet so as to face the axis of the hollow portion at least at a certain angle. . 6. The apparatus for discharging liquid synthetic resin raw material according to claim 5, wherein the opening has an inclination angle of 15 to 90 degrees with respect to the collision plate. 7. An apparatus for discharging a liquid synthetic resin raw material according to claims 5 and 6, wherein the vertical cross-sectional area of the hollow portion and the vertical cross-sectional area of the opening are approximately equal. 8 The nozzle was supported in a state not parallel to the surface from which the injected liquid raw material was discharged, the nozzle and the hollow body were connected in a straight line, and the collision plate was fixed to the lower end of the hollow body so as to be perpendicular to the surface. An apparatus for discharging a liquid synthetic resin raw material according to claims 5 to 7. 9. An apparatus for discharging a liquid synthetic resin raw material according to claims 5 to 8, wherein the discharge range of the discharged raw material is controlled by changing the area of the opening in contact with the collision plate.