JPH02293067A - Coater - Google Patents

Abstract

PURPOSE:To prevent deterioration of quality by forming the outer circumference of a coating roll of an elastic foaming body and compressing the elastic foaming body by a pressing roll in coating. CONSTITUTION:A coating roll 1 is made columnar and formed of an elastic foaming body such as a sponge roll. Coating C is held in the foams and thereafter compressed so that it is pressed by a base material B supported by a backup roll 4. Thereby coating C is applied to the decorative surface B1 of the base material B. The backup roll 4 is a columnar rigid roll and rotated while supporting the base plate B and also the decorative surface P1 of the base material B is brought into contact with the elastic foaming body 3 of the coating roll 1. Thereby coating C is applied in the uniform film thickness and the quality of the formed film is drastically enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating apparatus for uniformly forming a coating film on a substrate, such as a thin metal plate.

[Conventional technology]

As shown in FIG. 5, a conventional apparatus for applying paint to a substrate using a sponge roll supplies paint d from a paint supply device C between sponge roll a and guide roll b, and The elastic foam on the outer periphery of the sponge roll a deforms between the sponge roll a and the base material e to hold and apply the paint d.

[Problem to be solved by the invention]

However, the state of the paint d at the a+ point of the sponge roll a is such that when the sponge roll a is compressed by the guide roll b and then the elastic foam on the outer periphery of the sponge roll a separates from the guide roll b, the elastic foam is filled with air. The air was taken in, and the air remained in the elastic foam together with the paint d. For this reason, air bubbles are formed in the paint d applied to the base material C, and traces of air bubbles remain in the finished product formed by the subsequent drying and firing process, which leads to a decrease in yield and quality. Ta.

[Means for Solving the Problems] In order to eliminate such drawbacks, the present invention holds the paint on the outer peripheral surface of the coating roll, and applies the paint to the base material by contacting the base material as the coating roll rotates. In the coating apparatus, at least the outer periphery of the coating roll is made of elastic foam, and the elastic foam of the coating roll is compressed in the paint by a pressure roll.

[Example] An example of the coating apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of a coating apparatus A according to the present invention, in which the upper part is a coating roller, 4 is a hankuan sprayer, 5 is a paint pan, 6 is a pressure roll, B is a base material, C is paint. To explain in more detail, the coating roll has a cylindrical shape and is made up of a core material 2 made of metal or synthetic resin, and an elastic foam 3 formed to cover the outer peripheral surface of the core material 2, for example. The sponge roll holds the paint C in its bubbles, and then the base material B is compressed by being pressed by the base material B supported by the backup roll 4.
Paint C is applied directly to the decorative surface B of the paint. The bank up roll 4 is a cylindrical hard roll, for example, made of a metal roll or a synthetic resin roll, and has a hardness higher than at least the elastic foam 3 on the coating roll, and supports the base material B. This is for rotating and bringing the decorative surface B1 of the base material B into contact with the elastic foam 3 on the coating roll. The paint van 5 is a container for storing the paint C to be supplied onto the coating roll, and is constantly supplied with the paint C by a paint feeder (not shown) so that the liquid level does not drop. The press roll 6 presses the elastic foam 3 of the coating roll 1 that is in contact with the paint C in the paint bun 5, and the elastic foam 3 compressed by the compression part A takes in air at the opening of the expansion part. By compressing and expanding this in paint C, the captured air is released outside as bubbles 3a. Further, after passing through the pressure roll 6, the elastic foam 3 expands and restores its original state by sucking in the paint C without taking air into the elastic foam 3.

Therefore, it is possible to always form a bubble-free paint C on the decorative surface B+ of the base material B with a constant film thickness. Reference numeral 7 denotes a doctor, which comes into contact with the outer peripheral surface of the elastic foam 3 on the coating roll, and is used to set the excess paint C or the adhesion thickness of the paint C. In addition, base materials B include metal materials such as colored steel plates, zinc/aluminum plated steel plates, temporary aluminum plates, stainless steel plates, copper plates, clad steel plates, and damping steel plates, or ceramic materials such as cement, clay, wood chip cement, and wood wool cement. The surface to be painted is either flat or has an uneven pattern added by embossing, etching, etc. as shown in FIG. 2. For example, paint C has synthetic resin components such as fluororesin, acrylic resin, polyurethane resin, epoxy resin, melamine resin, alkyd resin, polyester resin, furan resin, vinyl resin, urea resin, maleic resin, styrene resin, phenolic resin, and oil-free. Room-temperature curing type, heated or heat-curing type paint, or ultraviolet curing type using polyester, styrenated alkyd resin, aluminum paint, chilimen enamel, vinyl copolymer, polyvinyl butyral, ethyl cellulose, etc., and adding various pigments. It is a paint, glaze, etc., and has a viscosity of about 20 to 2000 centipoise.

Here, the operation of the coating device 8 according to the present invention will be briefly explained. As the base material B, a 0.27M thick colored steel plate with a stucco-like uneven pattern is used, and as the paint C, a fluororesin paint is used.

Therefore, a base material feeder (uncoiler) (not shown) is used to
The base material B is continuously fed between the coating roll and the backup roll 4 of the coating device A, and the coating roll, the backup roll 4, and the pressure roll 6 are rotated to form an uneven pattern on the decorative surface B1 of the base material B. Paint C is formed with a uniform film thickness. Next, the base material B on which this coating film has been formed is passed through a drying and baking process (not shown) in order to solidify the coating material C.

[Other Examples]

What has been described above is only one embodiment of the coating apparatus according to the present invention, and it can be formed as shown in FIGS. 3(a) to 4(d) and FIG. That is, in FIG. 3, (a),
(b) is a coating device A in which the coating roll and the backup roll 4 are vertically mounted. In the figures (b) and (C), the rolls are rotated in the opposite direction, and the paint is fed to the next process so that the paint surface C is Painting device A facing upward, (d) Press roll 6 as shown
This is a coating device A having a plurality of.

In addition, FIG. 4 shows a configuration including a base material supply section 8, an uneven pattern processing section 9, a coating device 8, a drying furnace 101, and a firing furnace 11.
This equipment has an integrated line from the supply and processing of paint C to the solidification of paint C.

[Effects of the Invention] As explained above, according to the coating apparatus A according to the present invention,
■A coating film can be reliably formed on substrates with large uneven patterns. ■No air bubbles are generated in the formed coating film, and the quality is greatly improved. ■Easy to install compared to conventional painting equipment. ■Productivity, quality, and yield improve.

It has the following characteristics and effects.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a coating device according to the present invention, Fig. 2 is an explanatory diagram showing an example of a base material, and Figs. 3 (a) to (d).
, FIG. 4 is an explanatory diagram showing other embodiments, and FIG. 5 is an explanatory diagram showing other embodiments. The figure is an explanatory diagram showing a conventional example. ...Painting equipment, B...Base material, C...Painting [,...
Coating roll, 3...Elastic foam,...Huck up roll, 6...Press roll Figure I Figure B Figure 2 q A ・ B C ・ 1 ・ 4 ・ ・ 6 ・ ・ ・Coating equipment/base material Paint/Coating roll/Elastic foam/Hasoku-up roll/Press roll (α) Figure 10Cb) Figure S

Claims (1)

[Claims] (1) In a coating device that holds a paint on the outer peripheral surface of a coating roll and applies the paint to the base material by contacting the base material as the coating roll rotates, at least the outer periphery of the coating roll is made of elastic foam; A coating apparatus characterized in that the elastic foam of the coating roll is compressed in the paint by a pressure roll.