JPH04223112A - Forming method of molding material made of fine humid powder material - Google Patents

Abstract

PURPOSE:To obtain homogeneous molded body having smooth surface state in the forming method concerned, in which formed body is produced by thermally hardening molding material prepared by bringing fine powder material in humid state with a small amount of liquid hardening resin. CONSTITUTION:Fine humid powder material 1, which is brought in humid state with a small amount of liquid hardening resin without being granulated, is fed on a forming mold 2 so as to be thermally hardened under the condition that its surface is leveled to the predetermined thickness with an obliquely arranged leveling blade 3 with or without being smoothed with a rotary cylindrical brush 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a molding material made of fine wet powder particles.

0002

[Prior Art] It is known to bond fine powder and granules to each other with a relatively small amount of curable resin liquid to obtain molded bodies in plate shapes and other shapes without granulating them.
This molded product has fine holes drilled on its surface, and has an anti-slip effect in wet areas, moisture absorption and release, and soundproofing effects, and is used as flooring materials, moisture absorption and release wall materials, soundproof building materials, etc. It is expected that it will be used for

In order to uniformly fill a mold with the molding material made by moistening this fine powder with a small amount of curable resin liquid (hereinafter referred to as fine wet powder), it is necessary to apply vibration after filling the mold to a certain extent. Trying to fill it evenly by tapping or tapping. In addition, when molding a flat plate-shaped compact, the fine wet powder granules supplied onto the mold are passed under a gate arranged vertically together with the mold, and the excess fine wet powder granules are removed at the lower end of the gate. It is removed to make the thickness uniform.

0004

[Problems to be Solved by the Invention] By the way, in the former method using vibration or tapping, fine wet powder particles are easily granulated by the vibrations during vibration or tapping, and the fine wet powder particles have a uniform bulk density. There was a problem that it could not be maintained. In addition, in the latter method of removing excess fine wet powder granules at the lower end of the vertical gate, the fine wet powder granules supplied in large quantities become compacted by their own weight before being transported to the gate section. Therefore, there was a problem in that the tight part was removed together with the surplus part by the gate.

The present invention aims to solve these problems.

[0006]

[Means for Solving the Problems] The method of molding a molding material made of fine wet powder granules of the present invention involves mixing fine powder granules with a curable resin liquid and moistening the fine wet powder with the resin liquid. The powder and granules are supplied to a mold, and the upper surface of the fine wet powder and granules supplied to the mold is scraped to a predetermined thickness with an obliquely arranged scraping blade, and then the fine wet powder and granules are heated and hardened. It is characterized by the fact that fine powder particles are mixed with a curable resin liquid and the fine wet powder particles made wet with the resin liquid are supplied to a mold, and the The supplied fine wet powder granules are roughly leveled with a rotating cylindrical brush, and then the upper surface of the fine wet powder granules is scraped to a predetermined thickness with an obliquely arranged scraping blade, and then the fine wet powder granules are It is characterized by being cured by heating.

[0007] In this invention, the fine powder is as follows:
For example, crushed products such as marble and granite, Franklin fiber, hygilite, aparttalgite, wollastonite, glass milled fiber, alumina short fiber,
Examples include carbon short fibers, potassium titanate short fibers, whiskers, etc., and generally those having a size in the range of 60 mesh pass to 800 mesh pass are appropriately selected and used. Examples of the curable resin liquid include thermosetting resins such as acrylic resin, unsaturated polyester resin, epoxy resin, and phenol resin.

[0008] In addition, in the scraping blade used in the present invention, its oblique angle, material, thickness, angle of the tip portion, etc. are appropriately determined depending on the weight and shape of the fine wet powder granules, but the oblique angle is generally An angle of about 30° or less is adopted. This is because if this angle approaches 90° or is reversed beyond that angle, the excess fine wet powder particles will be compacted by the cutting edge and will not be removed effectively. In order to prevent fine wet powder particles from adhering to or staying on the scraping blade, the cutting edge can be treated with Teflon or fluorine, or the blade can be vibrated finely and at high speed. Furthermore, when using a rotating cylindrical brush to roughly level the fine wet powder granules supplied to the mold, the number of rotations, the length, hardness, and amount of the brush bristles should be adjusted to It is adjusted appropriately depending on the weight and shape of the particles.

[0009]

[Operation] The diagonally arranged scraping blade scrapes off the excess on the top surface of the fine wet powder granules, so the fine wet powder granules are not crimped by the scraping blade, and the fine particles supplied to the mold are The uniformity of the filling amount and bulk density of the wet powder granules is not inhibited, the thickness is adjusted to a predetermined value, and a molded product having a uniform thickness can be molded.

[0010] Furthermore, by roughening the powder with a rotating cylindrical brush in advance, the fine wet powder particles can be more smoothly and reliably rubbed off with the scraping blade.

[0011]

[Embodiments] Examples of the present invention will be described below. In addition,
Parts refer to parts by weight. Preparation of fine wet powder granules The fine powder and curable resin as shown in Table 1 are mixed using an Eirich mixer, and then uniformly dispersed using a turbulizer to obtain fine wet powder granules A, B, C, D
adjusted.

0012

[Table 1]

Examples 1 to 4, Comparative Examples 1 to 3 Each of the fine wet powder particles A, B, C, and D was placed in a container, and the fine wet powder particle 1 was placed in the container from the bottom of the container at an air pressure of 5 kg/cm2. The flung fine wet powder particles are sucked from the top of the container and spouted onto the mold 2 to supply them, and as shown in Figure 1, they are transferred to the right and placed diagonally (θ). The fine wet powder granule layer 1 is cut into 10 m by the scraping blade 3.
This was molded under pressure at a press pressure of 60 kg/cm2, and then heated and cured to obtain a plate-shaped molded product (Example 1 shows the case where fine wet powder granules A were used, Example 2 is the case where the powder B is used, Example 3 is the case where the fine wet powder granule C is used, and Example 4 is the case where the fine wet powder granule D is used. was set at 30°).

[0014] For each, the smoothness of the scraped surface on the upper surface of the fine wet powder granule layer 1 after scraping and before pressing was visually judged, and the smooth one was rated as ○, and the one that was not smooth was rated as ×. In addition, the bulk density of each sample was measured, and those whose standard deviation value was 0.2 or less were marked as ○, and those whose standard deviation value exceeded 0.2 were marked as ×. These results are shown in Table 2. For comparison,
When the fine wet powder granules C supplied onto the mold were made uniform by applying vibration (Comparative Example 1), when the scraping blade angle θ was set to 90° and the thickness was scraped to 10 mm (Comparative Example 2) ), the angle θ of the scraping blade is 150°
For each sample (Comparative Example 3), the smoothness and bulk density of each sample were measured after scraping and before curing in the same manner as above. The results are shown in Table 2.

Examples 5 to 8, Comparative Examples 4 to 6 Above Example 1
4 and Comparative Examples 1 to 3, as shown in FIG.
The smoothness and bulk density of the fine wet powder granules 1 on the mold 2 were measured in the same manner as in Examples 1 to 4 and Comparative Examples 1 to 3 above, except that the particles were smoothed in advance with a rotating cylindrical brush 4. . The results are shown in Table 2.

[0016]

[Table 2]

As is clear from the results, the product produced by the method of the present invention had good smoothness and no variation in bulk density.

[0018]

[Effects of the Invention] In the method of this invention, the surface condition of the fine wet powder granules supplied to the mold becomes smooth, and the uniformity of the bulk density is not inhibited, and the thickness is adjusted to be uniform. It is possible to mold a molded product with good thickness and surface condition. Furthermore, by roughening the powder with a rotating cylindrical brush in advance, the fine wet powder particles can be more smoothly and reliably rubbed off with the scraping blade.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating one embodiment of the method of the present invention.

FIG. 2 is a sectional view illustrating another embodiment of the method of the present invention.

[Explanation of symbols]

1 Fine wet powder granules 2 Molding mold 3 Scraping blade 4 Rotating cylindrical brush

Claims (2)

[Claims] Claim 1: The fine wet powder particles are mixed with a curable resin liquid and moistened with the resin liquid, and then the fine wet powder particles are supplied to a mold, and the fine wet powder particles supplied to the mold are A method for molding a molding material made of fine wet powder granules, characterized in that the upper surface of the granules is scraped to a predetermined thickness with a scraping blade disposed diagonally, and then the fine wet powder granules are heated and hardened. 2. The fine wet powder particles, which are made by mixing fine powder particles with a curable resin liquid and are moistened with the resin liquid, are supplied to a mold, and the fine wet powder particles supplied to the mold are The granules are roughly leveled with a rotating cylindrical brush, then the upper surface of the fine wet powder granules is scraped to a predetermined thickness with an obliquely arranged scraping blade, and then the fine wet powder granules are heated and hardened. A method for molding a molding material made of fine wet powder granules.