CN102225653B - Production method of hot-applied film color-coated board - Google Patents

Abstract

The present invention relates to a kind of production method of hot-film color-coated plate, adopt following steps: clean substrate; carry out chrome-free passivation to substrate; carry out initial coating to substrate after drying, namely coat the back paint; wait for step ( 3) The back paint in the process is cured, and the substrate is water-cooled; the substrate is coated with glue on the fine coating B, that is, the adhesive is coated, and the glue is activated; the composite film is thermally coated on the substrate; after the film is covered, water cooling and cold film application ; Inspect the obtained hot-film color-coated plate, and then coil it. The invention fills up the technological gap in the high-speed (over 30m/min) production of heat-adhesive film color plates in my country, and plays a certain role in promoting production capacity and cost reduction. Not only can the function of the production line equipment be fully utilized, but more importantly, once it is mass-produced, it can significantly improve economic benefits.

Description

A kind of production method of hot-film color-coated board

technical field

The invention relates to a production method of a color-coated plate with a heat-adhesive film.

Background technique

At present, the domestic and foreign demand for thermal film color plate products is increasing year by year. The low production capacity of the hot film production line is mainly due to the low speed of the domestic hot film production line, which is basically 6-20m/min, which directly affects the production efficiency. How to increase the production line speed of hot film products is a matter of great concern to the industry. The line speed adopted by the inventor's unit is 30m/min, and the development of thermal film color plate is not only a progress of the new product work of our factory, but also fills the technical gap of high-speed line production of thermal film color plate.

Contents of the invention

The purpose of the present invention is to provide a method for producing color-coated plates with thermal film, which can ensure the production quality of color-coated plates while increasing the production speed.

The specific technical scheme is as follows:

A method for producing a color-coated sheet with thermal film, adopting the following steps:

(1) cleaning the substrate;

(2) carry out chrome-free passivation to substrate;

(3) After drying, the substrate is initially coated, that is, the back paint is coated;

(4) Treat the backside paint in step (3) to solidify, carry out water cooling to substrate;

(5) Glue the substrate on the fine coating B, that is, apply the adhesive and activate the glue;

(6) thermally covering the composite film on the substrate;

(7) Water cooling and cold film application after lamination;

(8) Inspect the obtained hot-film color-coated plate, and then coil it.

Further, before cleaning the substrate in step (1), the substrate is pre-cleaned.

Further, the steps (3) and (4) are carried out in a primary coating curing furnace.

Further, the step (5) is carried out in a roller coater and/or a finish coating curing furnace.

Further, the step (6) is carried out on a film laminating machine.

Further, the base plate in the step (1) is a soft cold-rolled plate.

Further, the thermal lamination film in the step (6) is selected from PET+PVC composite film.

Further, the metal heating peak PMT in the step (6) is 180-220°C, preferably around 200°C.

Further, the film laminating rollers selected in the film laminating machine are an upper steel roller and a lower rubber roller.

Further, the viscosity of the glue or adhesive in the step (5) is controlled at about 20s.

Further, the speed of the production line is controlled at 30m/min; when producing hot-coated products with cold-rolled plates, the furnace temperature must be appropriately lowered, and at the same time the water quenching spray pressure should be reduced; all roll surfaces should be cleaned and wiped before production; Clean up the dirt on the film-coated roller beforehand, adjust the film pressure and film tension, and clean the glue on the roller; closed facility.

Compared with the current prior art, the present invention fills the technological gap in the high-speed production of heat-adhesive film color plates in my country, and plays a certain role in promoting production capacity and cost reduction. Not only can the function of the production line equipment be fully utilized, but more importantly, once it is mass-produced, it can significantly improve economic benefits.

Description of drawings

Fig. 1 is the process design diagram of the key section of the present invention (roller coating-film-finishing water quenching)

Note: Glue is injected into the paint tray.

Detailed ways

The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

Referring to attached drawing 1:

1) The production process of the product is as follows:

Substrate→pre-cleaning→cleaning→chrome-free passivation→drying→primary coating of back paint→back paint curing→water cooling→glue coating (finish coating B)→glue activation→heat-coated composite film→water cooling→(cold film)→inspection → Coiling.

2) During production and commissioning, the primary coating is coated with back paint, the finishing coating B is coated with adhesive, and the line speed is controlled at 30m/min. The substrate is made of soft cold-rolled plate, and the hot-coated film is made of PET+PVC composite film. The glue viscosity is controlled at about 20s. PMT is controlled at around 200°C.

3) Before production, clean and wipe all the roller surfaces (primary coating water quenching and squeezing rollers, 5# correction rollers, 8# steering rollers, 4# tension rollers and other main rollers and all rollers on the line), which will reduce and eliminate Particles, bubbles and other defects.

4) Clean up the dirt on the lamination roller before lamination, adjust the lamination pressure (70N) and film tension (20N), and clean the glue on the roller.

5) The film sticking rollers used are the upper steel roller and the lower rubber roller. In terms of surface quality, the effect is good. The wrinkle phenomenon is directly eliminated, and the thermal lamination film is firmly pasted and smooth.

6) In order to eliminate the phenomenon of creases in the middle of the back of the substrate after passing through the curing furnace, when producing hot-coated products with cold-rolled sheets, the cooling process must be properly adjusted to obtain a good film-attaching effect.

7) Thermal film products have high requirements on the environmental sanitation of the production line, and many places where floating dust may appear may cause dust particles. Therefore, our factory has fully closed the inspection platform of the 2# production unit (hot film production line), and added closed facilities to the film on the hot film. In addition, there is a section of the steel strip exposed to the air from the initial coating curing furnace to the finishing coating curing furnace. In order to avoid dust adhesion, both sides are covered with curtains.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods, as long as the various improvements of the method concept and technical solutions of the present invention are adopted, or directly applied to other Occasions, all within the protection scope of the present invention.

Claims (2)

1. A production method of thermal film color-coated plate, is characterized in that, adopts following steps: (1) cleaning the substrate; (2) Carry out chrome-free passivation to the substrate; (3) Carry out in the initial coating curing furnace: after drying, the substrate is initially coated, that is, the backside paint is coated; (4) Carry out in the initial coating curing furnace: the backside paint in the step (3) is to be cured, and the substrate is water-cooled; (5) Carry out in a roller coater and/or a finish coating curing furnace: glue the substrate on the finish coat B, that is, apply an adhesive, and activate the glue, and the viscosity of the adhesive is controlled at 20s; (6) Carry out on the film laminating machine: hot-coat the composite film on the substrate, use PET+PVC composite film for the thermal lamination, the metal heating peak value PMT180～220°C, and the film laminating rollers selected in the film laminating machine are the upper steel roller and the lower glue roll; (7) Water cooling and cold film application after lamination; (8) Inspect the obtained hot-film color-coated plate, and then coil it. 2. The production method of thermal film color-coated plate as claimed in claim 1, characterized in that, before step (1) cleans the substrate, the substrate is pre-cleaned.