JPS6038186B2 - Solvent-free laminator coater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solventless laminator coater.

Conventionally, as a solvent-free laminator coater, two to four rolls are used in contact with each other when the viscosity of the coating liquid is low to some extent.

That is, as shown in FIG. 1, a base material a is fed between a pressure acid roll 1 and a coating roll 2, and the coating roll 2 has a doctor blade 3.

In the one shown in FIG. 2, a doctor blade 4 is used instead of a doctor blade.

With the above-mentioned coating, the coating roll does not uniformly transport the coating liquid, so the coating film cannot be coated in a uniform state.

The one in Fig. 3 shows an offset gravure coating method, in which a base material a is fed between a pressure roll 1 and a blank edge 2, and a flank cylinder 2 is placed in a coating liquid tank 5. The gravure roll 6 is in contact with the submerged gravure roll 6.

This method has good performance when the coating film is around 10 French, but
A thin film uniformity of 1 to 2 degrees cannot be obtained.

In other words, the above method is mainly a method for applying conventional solvent-based coating agents, and the uniformity of the coated surface, adjustment of the viscosity of the coating agent, etc. are determined by the composition that forms the intended coating agent. This is because it has to be done by selecting the solvent used.
In general, changing the composition of the coating agent, especially the type of resin, changes the wettability of the coating material, changes the flow characteristics, and causes the coated surface to become smeared, which is the cause of various fluctuation factors related to coating performance. becomes.

In solvent-based coating methods, the coating equipment itself does not have a means to absorb these fluctuation factors and improve coating performance.
Most of these problems can be resolved by selecting a diluting solvent to improve coating performance.

In other words, it can be said that the accuracy of the coating film thickness, etc. is adjusted by the solvent, regardless of the accuracy of the coating machine.

Furthermore, in conventional methods, in order to obtain the desired coating thickness, a coating is applied several times to several tens of times as thick, and then a drying process is performed to obtain the desired coating thickness. Therefore, fluctuations in mechanical precision etc. do not have much effect on the final product.

However, with solvent-free coating agents, there is no choice of solvent, and the coating composition has poor viscosity, fluidity, and wetting properties with the substrate, and the coating accuracy is 100% lower than that of coating agents. % solidifies on the base material, so it is directly influenced by machine precision and machine adjustment.

Therefore, it is extremely difficult to uniformly apply a solvent-free coating agent to a desired thickness using conventional solvent-based coating methods.

The present invention was invented in view of the above points, and does not require special rubber rolls or precisely control the rotation of each roll, and coats a solvent-free coating liquid with a uniform thin film. It was made so that it could be done.

That is, using the coating device, (1) Some of the rolls are reciprocated in parallel with the axial direction to twist the coating agent and create uniformity in the middle direction of the base material.

■ By transferring the coating agent to multiple rolls, uniformity in the flow direction of the coated surface is achieved.

In particular, by changing the roll diameter and changing the surface area of the transfer rolls, the thickness of the transferred coating agent on each roll surface is made different. By repeating this process, the coating agent is twisted on the roll and uniformity in the flow direction is obtained.

{3} Metal rolls and rubber rolls are constructed by placing resin rolls alternately.

Therefore, the coating agent can be transferred by thoroughly kneading the rolls while making them completely adhere to each other and causing slippage. The embodiments shown in the drawings will be described below.

In FIG. 4, the rolls 5 and 6 are coating liquid supply rolls that support each other, and the coating liquid is supplied between the rolls 5 and 6 from a nozzle 8 connected to a coating liquid pump. The roll 6 is a metal heating roll, and the other roll 5 is a rubber-coated roll. The roll 5 is paired with a sliding roll 4, which is equipped with a known mechanism for reciprocating in the direction of the koji, and is a metal heating roll equipped with a metal heating mechanism.

As a drive mechanism for a sliding roll that can reciprocate in all directions, for example, a lever equipped with a cam floor that contacts a cam applies reciprocating motion to the engaging collar of the roll spline-aligned with the rotating shaft via a link mechanism. Mechanisms, etc.

Two small-diameter rubber-covered rolls 7, 7 are interposed between this and the metal heating roll 3, and the rubber-covered roll 2 is opposed to the roll 53. The base material a is fed between the pressing roll 1, which is a heating roll.

Therefore, each roll is driven by a drive mechanism as shown by the arrow in the figure.
The coating liquid is transferred to the roll 5 in an uneven state by the coating liquid supply rolls 5 and 6, and the uneven coating liquid is evenly rolled in the lateral direction of the roll by the reciprocating motion of the sliding roll 4 in the ball direction. Transferred from 4 to roll 7,7.

In these rollers 7, 7, the transferred coating liquid is leveled uniformly in the flow direction, that is, in the longitudinal direction, and is transferred to the roll 3.

Roll 3 is made of metal and has a uniform surface smoothness due to surface treatment, so the coating liquid that is evenly leveled in the vertical and horizontal directions is evenly transferred to roll 2, and is uniformly applied to the base material. The coating liquid can be applied to.

At that time, the pressing roll 1 serves to improve the wetting of the base material a and the coating liquid, which is the coating material, and the metal roll 3 and the rubber coated roll 2 serve to improve the wetting of the coating liquid, that is, the base material a of the coating material. Helps improve familiarity with

Each of the metal rolls 6, 3, and 1 is equipped with a heating mechanism, and by being equipped with this heating mechanism, it is possible to reduce the viscosity of the coating liquid and make the kneading uniform. This helps improve the compatibility of the coating liquid with a.

In the case shown in FIG. 5, the uniformity of the thin film of the coating liquid in the vertical and horizontal directions is achieved by changing the diameter of the roll.

That is, each roll is driven by a roll drive mechanism as shown by the arrow in the figure, and the coating liquid is supplied between the coating liquid supply rolls 12 and 14 from the coating liquid pump through the nozzle 15,
The uneven coating liquid supplied to the roll 1 is made to have some degree of uniformity in the vertical direction by a kneading roll 13.
4 is a metal heating roll, roll 12 is a rubber coated roll, and roll 13 is a metal heating roll.

A sliding roll 11 made of a metal heating roll with a smaller diameter is in contact with the roll 12, and when the coating liquid is transferred from the roll 12 with a large surface area to the roll 11 with a small surface area, 11 The thickness of the transferred coating film becomes thicker. The roll 10 that is in contact with the roll 11 is a metal heating roll, and is similar to the roll 1 described above.
2, the thick coating film transferred to the roll 11 is thinned by being transferred again to the roll 10 having a large surface area, thereby making the coating film uniform in the vertical direction. It is now possible to Note that 9 is a pressure roll made of a metal heating roll. Figure 6 shows a coating head with a roll arrangement of the type shown in Figure 4 and the type shown in Figure 5, in which a doctor blade 23 is used as the coating liquid supply mechanism. There is.

Now, each roll of the coating head is driven by a roll drive mechanism as shown by the arrow in the figure, and the coating liquid is transferred to the metal heating roll 2.
2 to the rubber-covered roll 21, and then further transferred to the rubber-covered roll 21.
The material is transferred from the metal sliding roll 20 to the rubber-coated roll 19. In this case, since the diameters of roll 21 and roll 19 are smaller than those of rolls 22 and 20, it is possible to measure the increase or decrease in the thickness of the coating film in the vertical direction between them. The uniformity of the coating in the lateral direction is then achieved by rolls 20.

The coating film transferred from the roll 19 to the metal heating roll 18 is coated on the base material a in two coats using two small-diameter rubber rolls 17, 17, thereby making the coating film more uniform.

In any case, this type is effective when used for coating liquids with high viscosity.

Note that a metal gravure heating roll may be used instead of the metal heating roll 22.

The one shown in Fig. 7 is a simplified type in which the rolls 18 and 19 in Fig. 6 are omitted, and the rolls 24, 25, 26, 27, 2
8 are the rolls 22, 21, 20, 17, respectively in FIG.
This is a role corresponding to 16.

The one in Figure 8 has a doctor blade attached to a metal heating roll 3.
Emotion consists of a heated metal roll that has been coated with a coating liquid.

A rubber coated roll 3 with a small diameter is transferred to the roll 32.
1 is used to achieve uniformity of the coating film in the vertical direction, and uniformity in the lateral direction is achieved by reciprocating the roll 32. There are two rubber-coated rolls 33, 33 with a small diameter between the roll 32 and a super-dynamic roll 34 made of a metal heating roll, and these rolls 33, 33 provide uniformity in the longitudinal direction.

Furthermore, there are two rubber-coated rolls 35, 35 with a small diameter between the roll 34 and the metal heating roll 37.
A roll 37 with a highly accurate metal surface that provides uniformity in the horizontal direction by 4 and in the vertical direction by rolls 35 and 35.
It is being transferred to.

The base material a is fed between a pressure roll 39 made of a metal heating roll and a rubber coated roll 38, so that the coating film is uniformly transferred from the rubber coated roll 38 to the base material. The one shown in FIG. 9 has the number of rolls of the type shown in FIG. 5 increased, and a roll 44 is used instead of the kneading roll 13 shown in FIG. It was used between 43 and 43.

Rolls 41, 43 correspond to rolls 10, 11 in FIG.

Therefore, the coating liquid is supplied between the metal heating roll 45 and the rubber-covered roll 46 from the coating liquid pump through the nozzle 47.
The coating liquid transferred from the roll 45 to the rubber-covered roll 44 is smoothed by a metal heating roll 43, and further transferred to the metal heating roll 41 via the rubber-covered roll 42, and is then transferred to the Sho-sugata roll 40, which is a rubber-covered roll. The coating liquid is uniformly coated on the base material a by the cooperation of the two. 10th
The figure shows an example in which the rolls 30 and 31 of the type shown in FIG. 8 are omitted and the roll 32 is not used as an emotional roll. That is, the coating liquid is applied to a metal heating roll 53 by a doctor blade 54, re-kneaded by two small-diameter rubber-covered rolls 52, 52, and further uniformed by a sliding roll 51, which is a metal heating roll. Then, the metal heating roll 4 is heated using two small diameter rubber coated rolls 50, 50.
9, and then the coating liquid is transferred to the substrate a by cooperation with an impression roll 48 made of a rubber-coated roll.

Note that the roll 53 may be a metal heated gravure roll. Although uniformity of the coating film can be achieved by arranging the rolls as described above, the roll arrangement may be in combinations other than those shown in the drawings.

In short, by appropriately combining the method of using two small diameter rolls to achieve uniformity in the vertical direction and the method of varying the roll diameter to achieve uniformity in the vertical direction, and then sewing the sliding rolls together. Any material that ensures uniformity of the coating film may be used.

Therefore, it is also necessary to alternately apply the rubber coated roll and the metal roll.

The sliding rolls also need to be metal rolls, but they do not necessarily need to be heated, and since the rubber-covered rolls and metal rolls are alternately placed against each other, the sliding rolls should not be in contact with each other. There isn't.

However, the roll 5 at any position among the rolls arranged between the coating liquid supply roll and the coating roll can be used as a sliding roll.

Other coating liquid supply mechanisms include the squeezing roll system as mentioned above,
Either a doctor blade method or a gravure method may be used.

In the above embodiments, a synthetic resin coated roll may be used instead of the rubber coated roll.

In any case, the arrangement of the rolls constituting the coating head of the present invention requires alternate arrangement of rubber-coated or synthetic resin-coated rolls and metal rolls, excluding the coating liquid supply roll and coating roll. Any metal roll among the metal rolls must be equipped with a mechanism for reciprocating the roll parallel to the rotation axis. Then, the metal roll is heated as necessary in order to lower the viscosity of the coating liquid and make the kneading uniform, and to improve the viscosity of the coating liquid to be applied to the coating material. The above-described configuration has the feature that a highly viscous coating liquid can be uniformly applied to a base material in a thin film.

[Brief explanation of the drawing]

FIGS. 1 to 3 are explanatory diagrams showing a conventional laminator coater, and FIGS. 4 to 10 are explanatory diagrams showing different embodiments of the laminator coater of the present invention. 1, 3, 6, 9, 14, 16, 18, 22, 24, 28
,30,37,39,41,45,49,53...
...Metal heating. Rule, 2, 5, 10, 12, 17. 19, 21, 25,
27, 31, 33, 35, 38, 40, 42, 44, 4
6,48,50,52...Rubber coated roll, 4,1
1, 20, 26, 32, 34, 43, 51...
Sliding roll, 13... Kneading roll, 22, 53
...Metal heated gravure roll. Figure 1 Figure 2 Figure 4 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 101

Claims (1)

[Claims] 1. The coating head consists of a plurality of rolls that rotate in contact with each other, a coating liquid supply mechanism, and a roll drive mechanism, and some of the rolls are metal rolls, and the other rolls are rubber-coated rolls. or synthetic resin-coated rolls, the roll arrangement of which consists of alternating metal rolls and rubber-coated or synthetic resin-coated rolls, and which includes metal rolls other than the coating liquid supply roll and coating roll. A solvent-free laminator coater characterized in that an arbitrary metal roll is provided with a mechanism in which the roll is reciprocated in parallel with a rotation axis. 2. The solvent-free laminator coater according to claim 1, wherein the metal roll is a roll equipped with a heating mechanism. 3. The solvent-free laminator coater according to claim 1, wherein the metal roll adjacent to the coating liquid supply mechanism in the coating head is a gravure roll.