JPH046140A - Method and equipment for coating granular raw material for pottery with colorant - Google Patents

Abstract

PURPOSE:To surely coat the surfaces of the particles of a granular raw material for pottery with the sufficient proper amount of colorant by preliminarily mixing the powdery colorant with the raw material in a dry method and strongly pressing this mixed raw material by a compression rollers and then crushing and sifting it. CONSTITUTION:A granular raw material 1 for pottery and a powdery colorant 2 are preliminarily mixed by an agitation type premixer 5. This premixed raw material is strongly pressed between a pair of compression rollers 6, 7. Then the strongly pressed premixed raw material is crushed and shifted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for applying a coloring material to the surface of a granular ceramic raw material for tile production, and an apparatus for applying the same.

(Prior art) Conventionally, for example, in order to produce a tile with a spotted pattern, a granular ceramic raw material is first prepared by coating the surface with a coloring material, and then multiple types of granular ceramic raw materials of different colors are prepared. They mixed it up, pressed it into tiles, and then fired them.

Conventionally, in order to coat the granular ceramic raw material with the coloring agent, the granular ceramic raw material and the coloring agent, which has been made into a slurry by adding water, are mixed in a drum equipped with stirring blades like a concrete mixer. It depends on the method of mixing.

This method requires a large amount of work space, and conventionally, the application process has been carried out in separate factories for each different color of the coloring material. As a result, each factory has a different blend of raw stone, resulting in variations in the dimensions of the tile products, resulting in many defective products.

(Problems to be Solved by the Invention) According to the above-mentioned conventional method, the colorant in the form of a slurry penetrates deeper than necessary into the porous granular ceramic raw material when viewed microscopically. However, there was a problem in that expensive coloring materials were wasted.

Also, when press-molding granular ceramic raw materials into tiles,
Conventionally, it was impossible to average the moisture content of raw materials, so
Excess water was squeezed out into the press mold, resulting in defective molded products.

One way to deal with this problem is to mix a coloring material with powdered or granular ceramic raw materials and apply it, but with this method, the coloring material is simply sprinkled on the surface of each particle, and the coloring material is not needed. It was not possible to reliably apply the same amount of coloring material.

Therefore, the purpose of the present invention is to reliably apply an appropriate amount of coloring material to the surface of grains of granular ceramic raw materials, and at the same time to achieve the effect of densifying the structure of porous granular ceramic raw materials. To provide a method for applying a coloring material to a granular ceramic raw material and a coloring material application device used in this method, which is constructed so that the entire application device can be made as compact as possible. .

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the method of applying a coloring agent to a granular ceramic raw material according to the present invention includes a granular ceramic raw material F11, a powdery coloring material 2, The premixed raw materials are premixed by an agitating premixer 5, the premixed raw materials are strongly compressed between a pair of compression rollers 6.7, and the compressed mixed raw materials are crushed and sieved. The structure is as follows.

Further, the applying device according to the present invention for applying a coloring material to granular ceramic raw materials includes a premixer 8!15 in which a stirring member 11 is incorporated in a raw material hopper 14, and a mixture to be mixed supplied from the premixer 5. Pressing the raw material 1
The configuration includes a pair of compression rollers 6.7 and a crushing/sieving machine 8 that crushes and sieves the mixed raw material that has passed through the compression rollers 6.7.

Further, on the end face of the compression roller 6 or 7, a flange 24 is provided to seal both ends of the gap a between the pair of rollers 6.
It is good to provide 24.

(Function) The porous granular ceramic raw material 1 and the powdery coloring material 2 are preliminarily mixed by a premixer 5 and are then strongly compressed between a pair of compression rollers 6 and 7. , an appropriate amount of the powder coloring material 2 is reliably deposited on the surface of the granular ceramic raw material 1, and the structure of the granular ceramic raw material 1 is made m-densified.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the general structure of the application device used in the method of the present invention includes raw material tanks 3 and 4 that respectively store granular ceramic raw material 1 and powdered coloring material 2 as raw materials to be mixed; A stirring type premixer 5 for premixing these two raw materials, a pair of compression rollers 6.1 for strongly compressing the premixed raw materials,
The main component is a crushing/sieving machine 8 that crushes and sieves the mixed raw materials.

Next, the detailed structure of the delivery device will be described. Measuring devices 3 and 10 are incorporated in the bottoms of raw material tanks 3 and 4, respectively. 11.12 is the horizontal feed conveyor installed directly below these weighing devices, 13 is both these conveyors 11.12
A cross-feeding conveyor is provided between each end of the aS, the ends of which are located above the premix aS.

The premixer S has a horizontal stirring shaft 16 driven by a variable speed motor 15 inside the raw material hopper 14, and four horizontal stirring bars 17 as stirring members protrude radially around the stirring shaft 1G. It has a configured configuration. 14a is a raw material outlet at the bottom of the raw material hopper 14, and is located directly above between the pair of compression rollers 6.7.

A pair of compression rollers ε and 1 are horizontally opposed to each other with a gap a in between, as shown in FIG. 2, and pulleys 20 and 21 are fitted to one end of each shaft 18 and 19, respectively. . Variable speed motors 22 and 23 drive the compression rollers 6 and 7 separately, thereby reducing the driving torque of the recompression rollers 6 and 7.

Reference numerals 24 and 24 denote disk-shaped flanges that are replaceably attached to both end surfaces of one compression roller 6, and serve to seal both ends of the gap a.

Note that one shaft 18 is attached to the machine frame (as shown in the figure) of the wrapping device via a clearance adjustment mechanism so that the width of the clearance a can be changed by moving parallel to the other shaft 19. has been done. In this embodiment, the width of the gap a is approximately 0.3++- to 3m+m.
It is adjustable within a range.

The crushing/weighing device 8 includes a semi-cylindrical sieve 26 supported on a pedestal 25 with its axial direction horizontal, an enclosing frame 27 provided around the upper edge of the sieve 26, and a A crushing device 29 is provided with a stirring and crushing bar 28 which is rotated in close proximity. 30 and 31 are a stirring shaft and a variable speed motor for driving the stirring shaft. Reference numeral 32 denotes a transverse conveyor disposed directly below the sieve 2G, which transports the mixed raw materials to its storage location.

Next, the operation of the above configuration will be explained.

Prior to starting the application device, the width of the gap a between the pair of compression rollers 6.7 is adjusted to a desired width corresponding to the type of raw materials to be mixed, and the measuring ratio of both measuring devices 9° ID is adjusted. Adjust feed rate.

Next, each variable speed motor 15, 23, 31 is started, the rotational speed of each output shaft of these motors is adjusted, and each traverse conveyor 11, 12, 32 is started.

Then, when the metering device 9.10 is activated, the granular ceramic raw material 1 and the powder coloring material 2 in the raw material tank 3.4 begin to be supplied to the premixer 5 in a predetermined quantitative ratio.

Both raw materials that have fallen into the raw material hopper 14 are stirred by the stirring bar 17.
The raw material is premixed efficiently and falls from the raw material outlet 14a into the gap a between the pair of compression rollers 6.7. Then, by being strongly pressed by a pair of compression rollers 6.7 that are being rotated in opposite directions, an appropriate amount of powdered coloring material 2 is applied to the microscopic voids on the surface of the porous granular ceramic raw material 1. As it is pushed into the granular ceramic raw material 1, the particle size is reduced, so that an appropriate amount of the powder coloring material 2 is securely applied to the surface of the granular ceramic raw material 1 while being confined, and its structure is densified. .

When the granular ceramic raw material 1 is strongly pressurized within the gap a, it tries to escape to both ends of the gap a to which the strong pressure is not applied, but the gap a is sealed at both ends by the flanges 24, 24. This prevents the problem of raw materials spilling out from this part.

Since the collar 24 is rotated together with one compression roller 6, the collar 24 is rotated against the end surface of the other compression roller 1.
The flange 24 is in contact only intermittently, not all the time, so the wear and tear of the flange 24 is reduced compared to the conventional case where a weir plate is fixedly installed with sliding contact between each end face of a pair of rollers. It is significantly delayed and produces a power saving effect.

In the above configuration, the premixer 5 is not limited to the structure shown in the drawings, and the object of the present invention can be achieved even if the design of the pair of compression rollers 6, 7 is changed as appropriate. .

[Effects of the Invention] As is clear from the above explanation, the method and apparatus for applying a coloring material to granular ceramic raw materials of the present invention can achieve various excellent effects as listed below. play.

a) Even if the coloring agent is used in powder form instead of in the form of slurry as in the past, the coloring agent is forced into the porous structure of the granular ceramic raw material, and the right amount of coloring agent is applied to the granular ceramic raw material. It is firmly attached to the surface.

b) Unlike the case of using a sludge-like coloring material, when press-molding granular ceramic raw materials, there is less risk of moisture seeping into the mold and causing molding defects.

C) By passing through a compression roller, the structure of the porous granular ceramic raw material is densified, so the applied colorant is sealed within the porous structure, resulting in a more reliable application state, and the granular material is By densifying the structure of the ceramic raw materials, the dimensional accuracy and quality of fired products are significantly improved.

d) By combining a pre-mixer with a compression roller having high-performance mixing and compression functions, installation space and operating costs for the device can be reduced compared to conventional systems.

As described above, the coloring material application device according to the present invention greatly contributes to reducing equipment costs, improving product yield, improving product quality, etc. in ceramic factories.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a plan view of the compression roller portion, and FIG. 3 is a side view. Code Table 1 Granular ceramic raw material 2 Powdered coloring material 3.4 Raw material tank 5 Premixer 6.7 Compression roller 9.10 Measuring device 11.12.13.32 14 Raw + hopper 15.22.23, 31 16 .30 Stirring shaft 17 Stirring bar (stirring member) IL79 Shaft 2 24 Flange 2 2G Sieve 2 28 Stirring/crushing bar 2 a Gap transverse feed conveyor variable speed motor Crushing and sieving device, 21 5 Frame 1 Surrounding frame 9 Crushing device pulley

Claims (3)

[Claims] (1) The granular ceramic raw material 1 and the powder coloring material 2 are premixed using a stirring type premixer 5, and this premixed raw material is strongly compressed between a pair of compression rollers 6 and 7. A method for applying a coloring agent to granular ceramic raw materials, which comprises crushing and sieving the mixed raw materials. (2) A premixer 5 incorporating a stirring member 17 in the raw material hopper 14, and a 1 for strongly pressurizing the raw materials to be mixed supplied from the premixer 5.
A colorant application device comprising a combination of a pair of compression rollers 6 and 7 and a crushing and sieving machine 8 that crushes and sieves the mixed raw materials that have passed through the compression rollers 6 and 7. (3) Flanges 24 and 2 are provided on the end faces of the compression rollers 6 and 7 to seal both ends of the gap a between the pair of rollers 6 and 7.
3. The coloring material application device according to claim 2, further comprising: 4.