JPH0343057B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a foaming machine that manufactures foam by injecting foam raw materials from the periphery of the shaft. Regarding a foaming machine equipped with blades.

Synthetic resin foam has excellent performance as a heat insulating material, and is expected to be in great demand due to the need to save energy and resources. Furthermore, from the perspective of resource conservation, there is an increasing demand for foams with a high expansion ratio.

Conventional methods for manufacturing highly foamed materials include foaming, which is a foam raw material resin, a curing agent, and a foam that is liquid at room temperature and pressure, but vaporizes when the temperature rises, or liquid under pressure, but becomes gas at room temperature and pressure. A common method was to mix a foaming agent (hereinafter simply referred to as a liquid foaming agent) and then foam and harden the mixture. However, this method has the disadvantage that in order to increase the expansion ratio, it is necessary to use a large amount of foaming agent, which increases the cost of producing the foam. In addition, when producing foam using a liquid foaming agent, the foaming rate differs depending on the temperature of the atmosphere, making quality control difficult.Especially when the interior space of a residential panel is divided by slats, etc., unfilled areas may be difficult to control. This can easily cause problems such as .

On the other hand, water-soluble or water-dispersible thermosetting resins (hereinafter referred to as hydrophilic thermosetting resins) can be foamed using air as a foaming agent. There is no volume expansion, and quality control is easy. There is a great demand for hydrophilic thermosetting resins because they use air as a blowing agent, which makes the manufacturing cost low and the workability is good.

In the method of manufacturing a foam from a hydrophilic thermosetting resin using air as a foaming agent, resin liquid, air, and a curing agent are foamed and cured using a foaming machine. Most preferably, a floss foamer is used. The mechanical floss foaming machine is also called an Oaks-type continuous mixer (Japanese Patent Application No. 138604/1983, Patent Publication No. 17143/1973), and as shown in Figure 1, it has a mixing chamber with many protrusions 1 on the inner wall. A rotor 3 having blades 2 rotates,
It has a structure in which the blades 2 rotate between the protrusions together with the rotation of the rotor 3 without contacting the protrusions 1, and the foam base material, curing agent, and air are uniformly dispersed in the mixing chamber, resulting in a foam-containing state. . However, conventionally, when injecting the main resin (resin liquid) R, curing agent H, and foaming air A through the injection port 5 provided around the shaft 4, the shaft part, especially the curing agent inlet part, was frequently clogged. However, there were concerns about instability in production and quality due to changes in the composition ratio, contamination of gelled substances, decrease in expansion ratio, and decrease in yield.Therefore, there was a strong desire to improve the production method to produce more stable foams. It was rare.

The present inventor discovered that clogging in the shaft periphery can be prevented by attaching inclined blades 6 inclined with respect to the shaft axis direction to the shaft 4 periphery of a mechanical floss foaming machine, and completed the present invention. This is what I came to do.

The present invention will be explained below using the drawings. FIG. 1 is a longitudinal sectional view of the foaming machine of the present invention, FIG. 2 is a sectional view perpendicular to the axis, and FIG. 3 is an explanatory diagram of the inclination angle of the inclined blade. Figures 1 and 2
In the figure, the foam raw materials injected from the injection ports 5 advance as shown by the arrows through the space around the shaft 4, and are mechanically mixed and foamed by the rotation of the rotor 3 to form a foamed state. Then, it is discharged from a foaming machine, and then curing proceeds. 1st, 2nd
The figure shows an example of injection of foam raw materials R, H, and A, but in the space around the shaft where each raw material is supplied and reaches the mixing chamber, conventionally, each raw material is hardly mixed, so it is relatively Partially flowing in layers,
An excess amount of curing agent occurred, often resulting in clogging. In the present invention, the space around the shaft is stirred using inclined blades 6 to prevent the occurrence of a partial curing agent excess state, and at the same time promote the flow to the mixing chamber, thereby increasing the residence time of the raw material in the space. Prevent clogging by shortening. As shown in FIG. 3, the inclined blade 6 has an angle of 5 to
It is installed in a spiral shape with an inclination angle (θ) of 15°. If θ is small, the effect of promoting the flow of raw materials into the mixing chamber and preventing clogging will be small; if it is too large, the inclined blades 6 will become jammed during disassembly and cleaning, making it difficult to clean the area around the shaft 4. Preferably it is in the range of 5 to 7 degrees. The number of blades attached to the inclined blade 6 is
Although there is no particular limit, 2 to 4 sheets is preferable from the viewpoint of clogging prevention effect and disassembly and cleaning. Conventionally, due to clogging around the shaft, the interval for disassembling and cleaning this area was about one week, but with the present invention, this can be extended to about one month, making it possible to supply foam with stable quality for a long time. In addition, the effects were remarkable, such as improved productivity. The inclined blade 6 may be attached to the shaft 4 by welding or the like, or alternatively, as shown in FIG. 2, a cylindrical attachment fitting 7 may be fitted onto the shaft 4.

Note that typical examples of the hydrophilic thermosetting resin of the present invention include urea resin, phenol resin, and urethane resin.

[Brief explanation of drawings]

1 and 2 are sectional views of the embodiment of the present invention, and FIG. 3 is an explanatory view of the state in which the inclined blades are attached. 1...Protrusion, 2...Blade, 3...Rotor, 4...
...Shaft, 5...Inlet, 6...Slanted blade, 7
...Mounting bracket.

Claims (1)

[Claims] 1. A foaming machine with a structure in which a rotor with a large number of blades rotates in a mixing chamber with a large number of projections on the inner wall, and the blades rotate between the projections together with the rotation of the rotor without contacting the projections. In a foaming machine that injects a foam raw material whose main components are a water-dispersible thermosetting resin liquid, air, and a hardening agent from the periphery of a shaft connected to a rotor and foams the material.
A foaming machine characterized by having inclined blades attached to a shaft at an angle of inclination of 5 to 15 degrees with respect to the shaft axis direction so as to advance foam raw materials into a mixing chamber.