JPS58156368A - Coater - Google Patents

Abstract

PURPOSE:To perform the uniform application of paint, by changing the depth of a paint-supply hopper from its liquid surface to each of outflow openings in response to the surface configuration of each part of a workpiece to be coated. CONSTITUTION:In the coater for carrying out the work of coating with repelling power formed by the action that the roll brush 1 to which numerous hairs are flocked strikes against a buffle plate 15, a paint-supply hopper 13 is provided so as to make a difference in its depth from the surface 17 of paint to each part of outflow openings 16 in response to the grade of each surface part of workpieces 6, 6', 6'' to be coated. Accordingly, a difference in head is formed at each part of the outflow openings 16 to obtain a downflow amount corresponding to the gradient and to accomplish the uniform application of paint.

Description

[Detailed description of the invention] This invention relates to a coating equipment trap.

Conventionally, in order to give cement tiles a sense of grandeur and grandeur, they are usually made thicker and have a surface shape in which wavy parts and flat parts appear alternately. In order to impart beauty and durability, an inorganic coloring composition (
Paint) is applied and cured.

This painting is done by applying paint to the cement tile excipient using a mortar gun, ricing gun, or roll brush. Most of the methods involve holding the paint and checking the application state while painting, which has the drawback of being extremely low in productivity. In order to overcome this drawback, a continuous method has been adopted in which multiple guns are set on a belt conveyor and paint is automatically supplied while painting, but there is a lot of paint loss due to scattering, Because of the problem that the gun tends to clog at the outlet of the gun, a method using a roll brush is generally adopted industrially. When painting with a roll brush in this way, the paint is sprayed off by the repulsive force of the roll brush bristles that bend when they hit the flat baffle plate, so the paint is applied in the direction of the repulsion of the bristles, that is, the cement. It is splashed toward the surface of the shaped body for roof tiles.

In this case, uniform coating can be achieved if the surface of the shaped body is flat.゛However, the surface of the excipient,
If the shape has a wavy curved surface part or a straight sloped part where a sloped part and a flat part coexist, the surface area of the shaped body per unit length of the baffle plate is larger than the flat part. Since the area on the slope is larger than that on the flat area, the same amount of paint is splashed and the amount of paint per unit area on the slope is smaller than on the flat area, causing the problem that uniform coating cannot be achieved. was.

This invention was developed in view of the above circumstances, and by providing a unique structure to the paint supply hopper, it is possible to maintain the coating thickness even if the surface shape of the object to be painted, such as a molded object for cement tiles, has a curved or sloped surface. To provide a coating device that can uniformly and continuously coat.

The coating device according to the present invention includes: a roll brush in which a large number of bristles are planted on the same surface of a roll; a driving means for rotationally driving the roll brush; and a paint supply hopper provided above the roll brush. A roll brush comprising a baffle plate positioned parallel to the axial direction of the roll brush and disposed so that an inward edge contacts the bristles of the roll brush, the roll brush being bent by hitting the tip of the baffle plate as the roll brush rotates. This is a coating device that uses the repulsive force of the hairs of the roll brush to spray the paint supplied to the roll brush onto the object to be coated. It is characterized by a structure in which the depth from the paint liquid level to each outlet St is varied.

Next, this invention will be explained in detail based on examples. FIG. 1 is a side view of one embodiment of the present invention. In FIG. 1, the lFi roll brush tear,
This roll brush l#:t A large number of bristles (made of nylon or the like) are uniformly planted radially on the circumferential surface of the roll (iron core) 20. The outer periphery of this roll brush 1 has an upper part for paint inflow. Roll brush covers 5 each having a paint projection opening 4 formed on the F-side side are attached. Below the roll brush l, the objects to be coated 6.6', 6'
is placed on a pedestal 7 and transported by a conveyor 8. The roll brush IFi is disposed so that its central axis 9 is perpendicular to and horizontal with the transport direction (direction of the arrow) of the objects to be coated 6, 6', 6', and is driven by a motor (not shown). The trap is designed to rotate in the direction of arrow B.

A guide plate 10 is provided in the paint inflow opening 3 of the roll brush cover 5. Above the paint inflow opening 3, 1 g of paint (in this case, colored cement slurry) prepared by a paint mixer 11 is sent through a paint supply pipe 12, and a fixed amount of the paint is continuously applied to a roll brush. A paint supply hopper 13 is provided for supplying the paint.

A baffle plate 15 is provided at the upper edge of the paint projection opening 4 of the roll brush cover 5 and is parallel to the roll brush 1. It's stuck inside. When the tip of the bristles of the rotating roll brush 1 hits this inward edge and bends, and then comes off the inward edge, the roll brush 1 uses the repulsive force that causes the bristles to return to their original position, and the paint that has flowed down is removed. The objects to be coated 6.6', 6' are being transported as droplets 14.
Splash it towards it and paint it.

FIG. 2 shows a front view and a side view of the paint supply hopper 13, as well as its positional relationship with the lower roll brush and the object to be coated. The outlet 16 of the paint supply water collar 13 is an elongated slit in this embodiment. However, it may be a book in which many holes are arranged in a straight line, and there is no restriction on the shape of the opening. The length direction of this outlet 16 coincides with the axial direction of the roll brush 1. Therefore, the inclination of the surfaces of the objects to be coated 6.6', 6' is 2!1
; It is designed to match the direction of change. The structure of the outlet 16 of the paint supply water collar 13 is designed as follows. That is, the object to be painted 6°6', 6'(
In Fig. 2, a shaped body for cement tiles is shown as an example), the depth from the paint liquid level 17 to each part of the outlet is made different depending on the inclination of each part of the surface. There is a head difference at each outlet, and the overall tendency is for the amount of paint to flow down to be larger on sloped areas than on flat areas. It is designed so that the entire surface has a nearly uniform coating amount.

In other words, the object to be painted 6 (61, 6') in FIG.
Each part of the surface, that is, the top of the wavy curved surface 61. Wavy curved surface middle part 6
b. Outlet ports 16a, 16b, 16 corresponding to the respective parts of the surface of the paint supply hopper 13, corresponding to the inclinations of the lower end 6C of the wavy curved surface, the flat part 6d, and the straight slope part 6c.
The depth from the liquid level 17 at points c, 16d and 16e K is varied between the maximum depth H2 and the minimum depth 110. However, it is not limited to making the depth of each part of the outlet of the paint supply hopper in direct proportion to the surface of the object to be coated, but also under various practical conditions (for example, the depth of the sloping part such as the lower end 6c of the wavy curved surface). Apply upward to the lower end of the
After taking into consideration conditions such as paint flowing, etc.),
This means that the thickness of the coating film on each part of the surface is made as uniform as possible. Therefore, in practice, consideration is usually given to making the upper part of the slope part more thick, the lower part less thick, and the rolled end part less thick than the flat part. For small irregularities, it is also possible to omit consideration of changing the head difference.

In this invention, the depth from the liquid level of the paint supply hopper to each part of the outlet is changed in size according to the surface shape of each part of the object to be coated, that is, the slope, so that the paint is supplied per unit area of the slope part. The amount flows down onto the roll brush in a state where the amount is approximately equal to that on the flat part. The paint that has flown down to the roll brush in (7) is applied to the surface of the object to be coated, and uniform coating is achieved.

Next, a description will be given of a coating example in which a shaped body for a cement tile was coated using the coating apparatus according to the present invention. A mixture of 95 parts by weight of ordinary cement, 5 parts by weight of fl material, and 50 parts by weight of water was used as a compound for manufacturing cement tile excipients. A shaped body for cement roof tiles with a difference of 30 mm between the top and flat parts was made.

The structure of the paint supply hopper is such that the depth from the paint liquid level to each part of the outlet corresponds to the slope of each part of the surface of the cement tile excipient (minimum depth) 11 = 50 mm, maximum depth H2 = 7
It was designed to vary in size between 0 mm. As a result, the shape of the lower edge of the outlet almost conformed to the surface shape of the object to be coated 6 (6', 6'), as shown in FIG.

The paint used was a mixture of white cement, iron oxide, and water in a paint mixer. This paint flowed down from the paint supply hopper to a rotating roll brush through a supply pipe to coat the cement tile excipient. As a result, the coating thickness of each part of the painted surface of the shaped body for cement tiles was 0.5 to 0.8
The thickness was within the range of mm, the variation was extremely small, and the object to be coated had a nearly uniform thickness and was beautifully coated. On the other hand, in a comparative example in which the depth from the paint liquid level to each part of the outlet was the same, the paint film thickness at each part of the painted surface of the shaped body for cement tiles was over a wide range of 0.5 to 3.0 mm. It was a book with significant variation and non-uniformity.

As a result, unevenness in the coating was noticeable, and the surface appearance was also lacking.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between a paint supply hopper, a roll brush, and a cement tile forming body. 1...Roll brush 5...Roll brush cut-
6, 6', 6'...Object to be painted 63...Top of wavy curved surface 6b...Middle part of wavy curved surface 6C...Lower end of wavy curved surface 6d...Flat part 6C..., Straight slope part 1
3... Paint supply hopper 15... Baffle plate 16...
・Outlet 17...Paint liquid level Patent applicant Matsu Electric Works Co., Ltd.

Claims (1)

[Claims] (1) A roll brush in which a large number of bristles are flocked on the surface of the roll, a driving means for rotationally driving this roll brush, a paint supply hopper provided above the roll brush, and an axial direction of the roll brush. The roll brush is provided with a baffle plate positioned parallel to the baffle plate and arranged with a button so that the inward edge touches the bristles of the roll brush. This is a coating device that sprays paint supplied to the object to be coated, and the paint supply hopper has a depth from the paint liquid level to each part of the outlet corresponding to the slope of each part of the surface of the object to be painted. A coating device characterized by having a structure in which the thickness is changed. (ri) The coating apparatus according to claim 1, wherein the paint is an inorganic coloring composition, and the object to be coated is a cement tile excipient.