JPS58199126A - Foaming machine - Google Patents

Abstract

PURPOSE:To manufacture a foaming body of stable quality with excellent productivity by equipping inclined blades having a specified inclination angle to the axial direction of the shaft at the peripheral portion of the shaft connected to the rotor. CONSTITUTION:Foaming materials injected from inlets 5 are advanced along the arrow symbol through hollow spaces at the peripheral portions of the shaft 4, mixed and processed mechanically by the revolution of the rotor 3 into a foamed state, discharged from the foaming machine and thereafter hardening is promoted. The space portions around the shaft are stirred by the inclined bades 6, partial excess of hardener is prevented from occurring, at the same time, the flow of the material into the mixing chamber is accelerated, the remaining time of the material in the space portions is shortened thereby to prevent resin from clogging the passage. The inclined blades are set spirally with an inclined angle theta of 5-15 deg.. When theta is small, the flow of the material into the mixing chamber is accelerated but clogging preventing effect is small, while when theta is large, the inclined blades 6 stand as obstacles in the way for disassembling and cleaning the machine to make difficult cleaning of the periphery of the shaft 4.

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. This invention relates to a foaming machine equipped with inclined blades.

Synthetic resin foam has excellent performance as a heat insulating material, and strong demand is expected due to the need to conserve energy and resources. In addition, from the perspective of resource conservation, there is a strong demand for foams with a high expansion ratio.

Conventional methods for producing highly foamed materials include foam thick-phase resin, curing agent, and foaming agent that is liquid at room temperature and pressure but vaporizes when temperature rises, or liquid under pressure but at room temperature and pressure. A common method has been to mix a gaseous 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 foaming 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.

As described above, there is a strong demand for hydrophilic thermosetting resins because they use air as a blowing agent, so the manufacturing cost is low and 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 mechanical 70s foamer is used.

Mechanical 70s foam type is also called Oaks type continuous mixer (Tokugan Sho, No. 56-138604, Tokko Sho 4
0-1'i'143), as shown in Fig. 1, a rotor 3 having a large number of blades 2 rotates in a mixing chamber having a large number of projections l on the inner wall, and the blades 2 contact the projections 1. It has a structure in which the M trochanter rotates between the protrusions 30 times without any movement, and the foam base material, curing agent, and air are uniformly dispersed in the mixing chamber, resulting in a foam-containing state. However, conventionally, each component of the main resin (resin liquid) R1, curing agent H, and foaming air A was transferred to the shaft 4.
From the surrounding injection []5, when one person does it, the shaft part, especially the curing agent inlet part, is severely clogged, resulting in changes in composition ratio, contamination of gelled substances, decrease in foaming ratio, and decrease in yield. This caused concern about instability in production and quality, and there was a strong desire for an improved method for producing more stable foams.

The present inventor discovered that clogging in the shaft periphery can be prevented by attaching inclined blades 6 that are inclined with respect to the shaft axial direction to the shaft 4 periphery of a mechanical 70 bath foaming machine+- This led to the completion of the invention.

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. In FIGS. 1 and 2, 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. The foam is then brought into a foamed state and discharged from a foaming machine, after which curing proceeds. Figure 1.2 shows an example of injection of foam raw materials R, H, and A. Conventionally, each raw material is supplied in the space around the 7-yaft until it reaches the mixing chamber. Since there was almost no mixing, the curing agent flowed relatively in layers, resulting in excess curing agent in some areas, 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 and increase the residence time of the raw material in the space. Prevent clogging by shortening the length. As shown in FIG. 3, the inclined blades 6 are spirally attached at an inclination angle (θ) of 5 to 15 degrees with respect to the axial direction of the shaft.

If θ is small, the effect of promoting the flow of raw materials to the heating chamber and preventing clogging will be small; if it is too large, the inclined blades 6 will become an obstruction during disassembly and cleaning, making it difficult to clean the area around the shaft 4. Preferably it is in the range of f) to 7°. Slanted blade 6
There is no particular limit to the number of sheets to be attached, but 2 to 4 is preferable from the viewpoint of clogging prevention effect and disassembly for cleaning. Conventionally, due to clogging around the shaft, the interval for disassembly and cleaning of this area was about one week, but in the case of the present invention, this can be extended to about one month, making it possible to supply foam with stable quality for a long time. It becomes possible,
Moreover, the effects were remarkable, such as improved productivity. The inclined blade 6 may be attached to the shaft 4 by welding or the like to the shaft 4 itself, or alternatively, as shown in FIG. 2, a cylindrical 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]

FIG. 1.2 is a sectional view of the embodiment of the present invention, and FIG. 3 is an explanatory view of the state in which the inclined blades are attached. ”...protrusion, 2...blade, 3...rotor, 4...
・Shaft, 5... Inlet, 6... Inclined blade, 7.
...Mounting bracket. Agent Patent Attorney Masao Inoue

Claims (1)

[Claims] l A foam raw material is placed in a foaming machine that has a structure in which a rotor with a large number of blades rotates in a mixing chamber with a large number of protrusions on the inner wall, and the blades rotate between the protrusions together with the rotation of the rotor without contacting the protrusions. In a foaming machine that injects foam from the periphery of a shaft connected to a rotor and foams the foam, the periphery of the shaft has an inclination angle of 5 to 15 degrees with respect to the axial direction of the shaft so that the foam raw material advances into the mixing chamber. A foaming machine characterized by being equipped with inclined blades.