JPH02273568A - Roller curtain coater - Google Patents

Abstract

PURPOSE:To prevent fluctuations in a film thickness by forming a coating roll and a doctor roll as hard rolls and sliding a blade on the coating roll in the body length direction thereof. CONSTITUTION:Paint P is supplied to the roll gap between a hard coating roll 7 and a hard doctor roll 8 from a paint supply pipe and subsequently allowed to flow along the hard coating roll 7 downwardly and scraped off by the blade B brought into contact with the coating roll 7. The scraped-off paint flows along the stage N of the guide plate 12 provided to a blade stand 9 and separates from the leading end W thereof to form a paint curtain C which is, in turn, applied to the plate 1 to be painted passing under the blade B. Pressure bonding adjustment is performed by bringing the blade B to a state capable of being closely brought into contact with the coating roll 7 by preliminarily regulating the screws 10, 11 of the blade stand 9. By this method, yield is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to curtain flow coating techniques, particularly to a roller type curtain coater.

The present invention is applied to coating steel plates, other cut plates, or coiled plates.

[Conventional technology]

Curtain flow coating technology produces a smooth and beautiful coating surface by applying the paint in the form of a curtain, so it is applied to coating a variety of substrates such as metal wing plates, plastic films, and paper. . There are various methods for this method,
One of them is roller curtain 70-! ! ! There is a way to dress. ,: As shown in Figure 6, the rubber roll 2 is coated with paint P, diluted in advance with a solvent and viscosity adjusted 1-, and gold!
It is supplied to the roll gap between the X-manufactured doctor roll 3 and discharged downward along the coating rubber roll 2 through the roll gap, and comes into contact with the coach ink rubber 1 and the foil 2. The scraped paint 1P flows down along the blade 4 to form a paint car 1. ...- applied to the plate 1 to be coated passing below the door 4. The prescribed curtain at this time> Thickness is 1
- Aing rubber! 7.Adjust by adjusting the circumferential speed of the roll 2 and doctor roll 3 and the gap between the rolls. The doctor night 5 prevents the coating material P supplied between the coating rubber rolls 2 and 1 from flowing out in the direction of rotation of the doctor roll 3.

63-7869
In the publication, there is a method in which the slivers are coated with one roll, and the - method is the method in which the conventional sliving is done using a three-roll car unflow coater.
・Problems with type and O-bar flow type and 15,
However, there was a buildup of paint on the fixing part, so I decided to use the roll method to avoid cutting the curtains. -2 This is a method that eliminates the fixing part and prevents the adhesion and accumulation of paint, and uses a hard roll to prevent roll swelling.
One of the characteristics of cows is that there is no variation in the amount of adhesion.

[Invention solves 11, J: Doze, i! [Title] Conventional roller force - door-coupling - is coach-in ( - this 1 - a - in-roll - / i ≧ rubber elasticity 7j fl river 1
, 1) There was no way to adjust the pressing force of the presser foot. , 2-like near-thing roll 2
Hatsui...Tan, nitrile rubber, butyl rubber, etc. have hardness ranging from soft (rubber i! degree 25') to similar hardness (rubber hardness 95°). ), but the ketone type is used in paints. , ': J-st
For various types of cutting such as alcohol-based, aromatic-based, alcohol-based, etc.
4: These 17-layer materials have a larger or smaller degree of swelling 1-
20-ru? There were problems such as changes in the thickness of the curtain due to changes in the i-gap and defects in the appearance of the paint.

In order to solve this problem, the coating roll 2. Use hard coati〉grol instead of
By trying to improve the accuracy of the mechanical cutting of the roll and adjusting the pressure of the blank node, we suppressed fluctuations in the gap between the rolls due to rubber swelling and reduced the force and pressure.
- We were able to eliminate defects such as variations in the tensile thickness and poor coating due to unevenness.8 However, if the hard blade 4 is brought into contact with the lower part of the hard coating roller as shown in Figs. 7 and 8? When the curtain is formed (by scraping A41), gradually (1': the back side of the hard board 1...-4, there is some unevenness of the paint around the back side (Svitti phenomenon) on the roll surface. This causes problems such as uneven curtains and spots and streaks on the painted board.

, This is also shown in Fig. 7, and for further explanation, the supplied paint P is hard π coding 5 coats...-lua and doctor roller t.
#3 Discharge from the power gap to hard coach/in roll (
Scrape off the paint with the hard blade 4 and apply it to the car.
Ten〈? The coating is applied to the plate 1 to be coated, but at the time of step 42, if a hard coating is formed at the contact area between the hard coating roll 7 and the hard blade 4, as shown in FIG. 1・-Ding mouth・-Lua and hard blue l/-
・There are irregularities on the contact surface within the contact part of Do 4! ,・-shi(
Due to the heating process, very small particles may be formed in some parts, and gaps may be formed, causing unevenness and unevenness in the properties of the paint such as viscosity, resulting in hard coatings. - The paint comes out on the 'yA side of the board and the hard coating [1-11 adheres to the 1-rule 7. In order to eliminate this impression, the method of adjusting the hard coating roll 7 and the hard blade 4 and the pressure bonding force are changed. Various tests
As a result, drying of the rolls, excessive load on the tar, etc.
Severe damage to the roll! .

It is very difficult to operate it in practical use because it becomes difficult to use.)I,:.

The present invention not only prevents the film thickness variation due to swelling of the coating rubber roll, which was a problem in the previous roller car coatings, but also prevents the coating from changing in thickness due to the swelling of the coating rubber roll. Eliminates the unevenness around the back caused by the spitting ring 1,
The present invention provides a new daughter that can obtain a smooth f1 film with no defects and a stable 1noC.

[Means for Solving the Problems] The present invention solves the following problems by replacing the coating 17 and the doctor mouth with a hard mouth, and reducing the grade to 7.
Slide the door in the roll in the longitudinal direction, every "3-tJ" 1. This was the solution.

The present invention will be explained in detail based on FIG. 1h.

The device R of the present invention receives the supply of paint P as shown in Fig. E1 (1 day), car thickness adjustment number, 1! A hard coating roll facing a hard doctor roll B that can be retracted, and a hard blade B that brings the hard blade B into contact with the lower part of the Zoning roll 7;
...-! Arrange the stand 9, and as shown in the second factor, slide the 17-wheel lead B in the longitudinal direction of the trunk! jj (:ni-
X') Seshi 4. 2-0 Hard roll de-ing l1ii7-Role 7 is a metal roll or one such as steel, stainless steel, or china! A Niramic thermal spray roll is best, and the surface of the roll should be polished or buffed to a level of 91 mechanical finish (W) or higher, or the surface of the roll should be polished or buffed to a level equal to or higher than 91 mechanical finish (W). It has been treated with hard chrome plating or nickel plating to give it a mirror finish.

The blade B that is brought into contact with the footing roll 7 is machined into steel so as not to damage the part 6 where it contacts the footing roll 7.
W) I, hard chrome plating, nickel plating, j5,4 buff polishing 1-4 processing, line finish 1.7 or mirror finish processing I7 stainless steel. Or, it is easier to replace the blade.
・Materials such as hard rubber and hard plastic, which are resistant to solvents, can be used as long as they do not require frequent replacement and significantly impair painting workability. can also be used.

As with the coating roll 7, the hard doctor roll 8 has 1! A roll made of a hard material such as steel 7 stainless steel, titanium, ceramic, etc. that does not swell and cause film thickness fluctuations when moistened is required, and the roll surface finish does not cause uneven curtain thickness or damage the smoothness of the painted surface. It is preferable to perform a mirror finishing process from the viewpoint of ensuring the same. Furthermore, an adjustment mechanism for attaching the blade B to the coating roll 7 using the blade mount 9 is shown in FIG. As shown in FIG.
/-・For the blade B attached to the stand 9, loosen the screw 10 and tighten the screw 181. Lower L to adjust the pressing force of the blade B. Then, the boss of the coating roll
4. It has 4 rows so that it can be adjusted in the same way in the J-direction. 3. As shown in FIG. 5, the shape of the blade 13 is such that the coating roll n ((with respect to the tangent in the longitudinal direction and The elasticity of the material, such as carbon steel, alloy steel, stainless steel, and steelless alloy, can be improved by reducing the thickness T of the plate in order to bring it into close contact with the curved surface of the roll. For example, the glue used in the present invention is made of alloy steel (Swede, Dente, etc.), which is used to scrape off the ink that is attached to the gravure roll of a gravure printing machine. steel, etc.) and has a thickness T of 50.-150μ.

Figure 4 number. The guide plate 12 indicated by τ is connected to the blade I.
(at the same time, stage N allows the falling paint to flow smoothly downward. Angle θ.

tj: In order for the falling paint to flow down evenly in the direction of the curtain, it should be 80 degrees or less, and the corner part R should have a curved surface so that the flow smoothly flows downward JJ''2), and the tip part W
In order to prevent the paint from turning to the back side of the tip, set the angle θ2 to 30° or less.

[For production]

Next, the operation of the present invention will be explained.

In Fig. 1, the paint P is supplied from the paint supply pipe to the roll gap between the hard cope ink 11-roll 7 and the hard doctor roll 8. 17.1-The paint is caused to flow downward along the hard coating roll 7. 7. The paint flows along the 12 stages N, forms a paint curtain C away from the tip fiAw, and is applied to the plate 1 to be coated passing below the blade B.

Pressure adjustment between the blade B and the coding roll 7 is performed as follows. While rotating the coating roll 7 at a circumferential speed of 100II/+a i +1 in advance, the blade B is momentarily brought into contact with the surface of the coating roll to scrape off the paint 7, and then finely adjust the screws on the blade mount 9 to start coating. Prevent local unevenness (sliding phenomenon) from occurring in the roll.

Next, B1. /-・Coating roll penalty R for DoB
It was made to slide in two directions, and the ablation effect in the rotating direction of the hard coating roll 7 and the sliding direction of the blade B was made to smooth the contact surface to obtain a uniform state of penetration. Due to this 1+. Paint can be scraped off uniformly, and
It was possible to obtain a sealing effect that prevents the paint from becoming partially uneven on the hard coating roll (streaking phenomenon). (Refer to Figure 3) Example C] An example of the present invention will be described below.6 In the apparatus shown in Figures 1 and 2, the blade B was set under the conditions shown in Tables 1 and 2. A test was conducted in which the blade was slid @10mm (this invention) and when the blade was not slid at all (comparative example).
The results are shown in each table.

In addition, the stage N of the blade B used in the above example was machined to have a trowel surface finish (71, θ-・70', R, = 1
20°θ2=ao'.

Example 1 (DI material: solvent-based polyester paint, non-volatile content 40
%76 viscosity (Ford Cup #4) 50 seconds/25℃ ■ Coating conditions: Coating roll circumferential speed 100 m/m1n (hard chrome plated), metal roll 7. Roll diameter 24 Qilla, doctor roll circumferential speed 1.7 m/mi++ (Hard 17mm finish metal roll, roll diameter 20〇-so) Roll gap +0, 3mm+ Paint amount 73f! e/m2 Threading speed 60 cod/mi i +i when painting? 1
30 minute blade material and shape Swedish steel, T-70μ ■ Blade sliding speed conditions, paint appearance and car anchor condition are shown in Table 11.

Actual jIIA example =) ■ Paint: Solvent type polyester paint, non-volatile content 43%,
Viscosity (,7 ord cup "4) 100 seconds/25℃ ■ Coating conditions: = Footing roll circumferential speed 100 years/bite (hard chrome plated metal roll, roll diameter 240 - plow) Doctor roll circumferential speed 1.7M, /1m1n (hard l
1mm plated metal roll, L diameter 200w+m) Roll gap ]・00.27m 5-component coating amount 66cc/m2 Threading speed 60mm/win Painting time 30min Blade material and shape Swedish steel, T-70μ ■ Table 2 shows the blade sliding speed conditions, painted appearance, and curtain condition. 2 As shown in Table 2 and Table 2, if the blade is not slid, the conditions shown in Figure 7' and A stripping phenomenon as shown in FIG. 8 occurred, and the appearance of the coating became poor.

However, when the sliding speed of the blade is f:i as in the present invention at 1-h-1000 aa/wb in, as shown in FIG. l/-John action τ B The paint causes a uniform penetration phenomenon, and the filling and sealing effect appears, and no partial unevenness or cracking (spitting phenomenon) occurs on the back side of the 30-ru. A paint with a good appearance was obtained.

On the other hand, regarding the viscosity effect of the paint in the present invention, the sliding action of the blade in the paint viscosity range of 50 seconds and 100 seconds in the viscosity test using a 5-fourth cup container as shown in Examples Pi41 and 2. Utility ψ 5 No. 7: No difference is seen and the paint has a good appearance.

Incidentally, if the blade sliding speed exceeds 1000#1l111/trout;n, the courtesy swings laterally, resulting in uneven coating, which is not preferable.

〔Effect of the invention〕

In the present invention, the rolling roll is made into a hard mouth and the coating roller is moved in the north direction of the coating roll body. Maintains surface smoothness 1. , r:r!
.

Also, there is no fluctuation in group N due to roll swelling for a long time.

Moreover, there are no spots due to the spitting phenomenon (no coating defects due to two-dimensional unevenness), and 5. Stable coating quality was ensured.

This contributes to high work efficiency and product yield, and is expected to have significant economic effects.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing the device of the present invention, and FIG.
Front view 1 and FIG. 3 are sectional views taken along line A-A in FIG. FIG. 4 is a detailed view of the blade mount of the present invention, FIG. 5 is an enlarged view of the blade of the present invention, FIG. 6 is a schematic side view showing a conventional device, and FIG. 7 is a diagram of another example of the conventional device. A schematic side view showing the device; FIG. 8 is a sectional view taken along line AA in FIG. 7; 1... Board to be coated (cut board, coil), 2... Coating rubber roll, 3... Doctor roll, 4... Blade, etc.
・Doctor knife, 6...Paint supply pipe, 7...
・Hard coach roll, 8...Hard doctor roll, 9...1 blade rack, 10.11..., screw,
12...Guide plate.

Claims (1)

[Claims] 1. A coating roll and a doctor roll are provided, paint is collected between the coating roll and the doctor roll, and the paint flowing down along the coating roll is scraped off with a blade and flows downward in a curtain shape. A roller curtain coater configured as described above, wherein the coating roll and the doctor roll are hard rolls, and the blade is configured to slide in the longitudinal direction of the coating roll. 2. The shape of the guide plate to which the blade is attached is such that the paint flow stage angle θ_1 is 80° or less, and
The roller curtain coater according to claim 1, wherein the corner portion that directs the flow of the falling paint downward is configured with a curved surface, and the edge angle θ_2 of the tip portion from which the downwardly flowing paint hangs down like a curtain is configured to be 30° or less. .