JPS5867381A - Controlling method for thickness of paint film of roll type coater machine - Google Patents

Abstract

PURPOSE:To maintain the thickness of paint films by a coater machine constant at all times by detecting the pressing force between a pickup roll and an applicator roll in both end poisitons of the pickup roll and changing the position of the pickup roll according to the detected value thereof. CONSTITUTION:In a roll type coater machine, load cells 11, 11' are provided between bearing members 10 in both end parts of a pickup roll 4 and sliding supports 9 to detect the pressing force between the roll 4 and an applicator roll 3. The signals of said load cells and the set value of a pressing force setter 14 are compared and operated in a controller 13. In accordance with the operated value, a slider 7 is moved by motors 15, 15' and worms 8, 8' to change the position and the degree of inclination of the roll 4 with respect to the roll 3, whereby the detected loads of the cells 11, 11' are balanced at all times. Thus the rates of secular change and deflection generated in the roll 3 are corrected automatically, and the products having paint films of a uniform thickness are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention +1 relates to a coating film thickness adjustment method for a roll coater machine used in equipment for producing painted steel plates and the like.

Conventional 1-tamans include a pick-up roll that is generally made of metal and lifts up the paint in the coating pan, and a rubber-lined applicator roll that receives the paint from the pick-up roll 1- and applies it to a strip. Consisting of
The strip plate is transferred with both rolls set at a constant interval, and the applicator roll is used to paint the strip. The coating film thickness is adjusted by an operator who appropriately changes the number of rotations of the rolls of the coater and the interval between the rolls relative to the strip transport speed.

In recent years, as the demand for coated metal strips has increased, there has been a demand for uniform coating film thickness from the viewpoint of improving the quality of the coating itself and 1. saving energy. The thickness of the coating film formed on the strip depends on the material, surface hardness, swellability of the roll's outer diameter of the applicator roll to be coated, the type, composition, mixing ratio, dilution rate, etc. of the paint used, as well as the roll. -, the rigidity (deflection amount) of the roll support IS, and roll machining errors. The instability factor that has a particularly large effect is the swelling of the roll outer diameter.As shown in Figures 1 and 2, the outer diameter of rubber-lined applicator rolls changes over time due to the swelling effect of the thinner contained in the paint. As time passes, the expansion changes and its hardness gradually decreases. Therefore, if the distance between the roll axes between the big annoprol and applicator rolls is set at a constant position, the mutual pressing force at the outer periphery of the rolls (between the rolls) The contact pressure (contact pressure) changes over time, and the amount of squeezing between the applicator roll and the pick-up roll changes, resulting in an uneven amount of paint being applied to the applicator roll. B [) There is an inconvenience that the coating thickness on the board fluctuates. (In Figure 1, the horizontal axis shows the thinner immersion tLJ time (
T) The vertical axis shows the outer diameter of the applicator roll. Also, in Figure 2, the +1lIlf axis is soaked with thinner γ.
The rr time (T) is shown on the vertical axis, and the hardness of the applicator roll (rubber hardness) is shown on the vertical axis. ) In conventional equipment, as a measure to eliminate the above-mentioned inconveniences, the operator corrects the amount of change in the applicator roll over time by changing the roll position appropriately based on intuition, and the coating film l77IVl is There were drawbacks that were largely influenced by experience and level of proficiency.

In order to eliminate the drawbacks listed in 1-, the present invention investigates changes in applicator roll over time.1. A total of 1 liter of pressure between the pick-up roll and the applicator roll is inserted into the bearings at both ends of the big-amp roll.
The position and inclination of the pick-up roll are automatically adjusted so that the two measured suppression forces are balanced and remain approximately constant at all times, and the amount of change over time and amount of deflection that occurs in the applicator roll is automatically measured using an II device. The present invention is intended to provide a method for adjusting the coating film thickness #l of a roll coater machine, which can be corrected.

Hereinafter, a 20-roll type coater machine shown in FIGS. 3 and 4 will be described as an example. In the figure, 1 is a roll that guides the strip 2. Reference numeral 3 denotes an applicator roll whose outer periphery is lined with rubber or urethane-based synthetic resin, and is supported on the slider 5. When the slider 5 is moved by a worm jack 6 attached to the machine base, the applicator roll is rolled.
Make sure that the crawl 3 comes into contact with and separates from the strip plate 2.
·ing. A slider 7 is slidably mounted on the slider 5, and is moved by two sets of worm jacks 8, 81 fixed to the slider 5'2. A metal pick-up roll 4 is slidably supported in opposition to the ablation 11 caterer roll 3 in the radial direction. 9 is a U-shaped sliding support provided on the slider 7, and 10 is a bearing member fitted into the sliding support 9. Reference numeral 11.11' denotes a load cell provided between the bearing member [0] at both ends of the pick-up roll 4 and the sliding support 9. 12 indicates a paint pan. The rolls 3 and 4 degrees are connected to a drive device (not shown) so that they are driven and rotated. Reference numeral 13 is a control device, 14. is a pressing force setting device, and 15.15' is a motor for driving the worm jacks 8, 8' simultaneously or individually. Load cells 11 are installed in bearings at both ends of the pick-up roll to measure the pressing force between the pick-up roll 4 and the applicator roll 3, that is, the reaction force that supports the pick-up roll 4.
．． 11", and set the position and inclination of the pickup roll 4 relative to the Mapli car crawl 3 using the load cell signal bow and the pressing force setting device so that the detected loads of both load cells 11 and +1' are balanced and always constant. Control device 13 and motor 15.I that compare and calculate the settings of 14.
F+', slider 7 by worm jack 8.8'
The structure is such that the movement of l・complicated-5=changes. Incidentally, the amount of inclination of the pickup roll is adjusted within the range of play in the threaded portion and sliding portion.

Since the present invention is configured in this manner, changes in the applicator roll 3 over time, that is, a gradual increase in the roll outer diameter and roll hardness opening are all captured as changes in the reaction force between the rolls at the load cells 1 and 11'. Also applicator roll 3
Even if the roll has a tapered shape or is deflected due to polishing errors, this is also measured as a change in reaction force between the rolls. As a result of changing the roll spacing and roll inclination so that the detected values at both the rollers 11 and 11' are balanced and always constant, the mutual pressing force (contact pressure between the rolls) on the outer periphery of the rolls is changed. ) is stable, making it possible to keep the thickness of the coating film transferred to the applicator roll 3 constant.

Therefore, according to the present invention, correction work based on the operator's intuition can be eliminated, and a strip plate having a uniform coating film and thickness can be stably manufactured.

[Brief explanation of drawings]

6-th] +2 Fig. 3 shows the change over time in the outer diameter and hardness of the applicate roll with respect to the immersion time in thinner.
, 4 are schematic explanatory diagrams of a method for reading and leveling a coating film using a roll type coke machine according to the present invention. 3...Applicator roll 4,...Pickup roll 11.11'...Load cell Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] 1111 with pick annoflor and applica roll
The suppression force of the pink up roll was measured with each measuring device installed in the support part at both ends of the pink up roll, and both measurement pressure IEs were used.
A roll-type coater characterized in that the position and inclination of the pickup roll are changed so that the force is balanced and constant at all times, and the amount of change over time and amount of deflection that occurs in the applicator roll is automatically corrected. How to adjust the coating thickness of the machine.