JP3069855B2 - Bar coating device with closed liquid supply dam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention supplies the liquid resin in a film shape with respect to a running web along the backing roll is coated on the surface of the web, the cradle in the groove formed in the transverse direction at the top surface < The present invention relates to a bar coating apparatus in which a rotating smoothing bar is pressed against a coating film surface to adjust the thickness of the coating film.

[0002]

2. Description of the Related Art As this type of bar coating apparatus, the one disclosed in FIG. 1 is used. This known apparatus has a relatively small coating amount and is used for coating a substrate such as paper or a plastic film which does not cause scratches or the like upon contact with a bar. The film thickness of the resin liquid 9a lifted from the liquid tank 5 by the coating roll 6 is adjusted by a metering roll 7 which rotates in a reverse direction at a low speed, and is brought into contact with the base material 1 guided by the rolls 2, 3, and 4 to form a base. A coating film is formed on the material 1. The rolls 2, 3, and 4 can move in the vertical direction, and the base material 1 runs while maintaining an appropriate tension. The substrate 1 on which the coating film is formed advances as it is,
A rotating smoothing bar 8 is interposed between them to scrape off excess resin liquid 9b while making contact with the coating to form a uniform coating.

[0003] However, in this bar coating apparatus, since the coating section and the smoothing bar 8 are separated from each other, dust and dirt adhering to the coating film stay in the front of the bar during that time. Vertical streaks may be formed. Further, the scraped-off resin liquid 9b is recovered. However, once the resin liquid 9 comes into contact with the outside air, the composition of the resin liquid changes due to evaporation of water and solvent. It is not possible, and it is necessary to readjust the formulation at the time of one-time recovery and subsequent batch processing.

[0004]

Technical Problem The present invention supplies a resin liquid 9a in the form of a film to a web 1 running along a backing roll 6 to apply the resin liquid 9a to the surface of the web 1, and forms the resin liquid 9a in the width direction on the upper surface of a receiving table.
In a bar coating apparatus in which the smoothing bar 8 rotating in the groove formed is pressed against the surface of the coating film to adjust the thickness of the coating film, the smoothing bar 8 is prevented from bending.
The object is to keep the surface smooth .

[0005]

Technical means for solving this technical problem include (a) a smoothing bar 8 provided downstream of the resin liquid supply nozzle 11 so as to contact the web 1 running along the backing roll 6. (B) Cradle and cradle
Push-pull bolt to move up and down and smoothing
A leaf spring 32 pressing the doctor blade 30 for the bar 8
And that the smoothing bar 8 is kept straight .

Since the smoothing bar 8 is disposed downstream of the resin liquid supply nozzle 11 so as to contact the web 1 running along the backing roll 6, the nozzle 11 and the smoothing bar 8 are extremely close to each other. And web 1
The film thickness is adjusted immediately after the coating film is formed thereon. A push-pull bolt that moves vertically
25, 26, 27, and smoothin
A doctor blade pressed by a leaf spring 32 is attached to the bar 8.
30 is pressed against the cradle 21
Bolts 25, 26, 27 and leaf spring 32
The jing bar 8 is kept in a straight line so that it does not bend during rotation, and removes the resin and solvent components that are likely to adhere to the surface of the bar 8 to keep the surface of the bar 8 smooth at all times. I have.

The second technical means is that, in addition to the first technical means, a liquid flow path 23 is formed below and parallel to the concave groove 22 of the receiving base 21, and the concave groove 22 and the concave groove 22 are formed. That is, the grooves 22 are communicated with the slits 24. The liquid circulating in the flow path 23 can reach the concave groove 22 to wash away the resin liquid 9a that is about to adhere to the surface of the bar 8 with the liquid. The third technical means is the first or second technical
In addition to the means, below the smoothing bar 8 the web 1
Sealed type for collecting the resin liquid 9b removed from the surface
Dam 15 and connect the dam and the resin liquid supply tank
It is to make it. Resin removed from the surface of web 1
The liquid 9b was introduced into the dam 15 immediately and in a sealed state.
The resin liquid 9b is collected in the tank without coming into contact with outside air
Can be done .

[0008]

[Effect of the present invention] The bending of the smoothing bar during rotation is prevented.
Stop and adjust the film thickness while keeping the surface smooth
Can be . In addition, as a result that the resin liquid can be collected without contacting with the outside air, there is an advantage that the composition and viscosity are not changed because the water and the solvent do not evaporate, and the resin liquid can be directly supplied to the nozzle.

[0009]

FIG. 2 is a sectional view of a main part of a bar coating apparatus according to the present invention. An example in which the resin liquid supply nozzle 11 is configured by a nozzle body 12 fixed to a support member 14 and an upper lid 13 fixed to this body is shown. A slit 16 is provided between the nozzle body 12 and the upper lid 13 over the entire length in the width direction.
The resin liquid 9a supplied by a pipe 15 from a resin supply tank (not shown)
6 and supplied in the form of a film. A gap 17 slightly larger than the coating film is formed between the nozzle 11 and the backing roll 6 toward the downstream side of the nozzle 11, and the resin liquid 9 a flows through the gap 17 between the backing roll 6 and the web. Apply to 1.

A smoothing bar 8 arranged on the downstream side and close to the tip of the nozzle 11 applies a slightly thick coating film on the web 1 running along the backing roll 6 to the roll 6. Between the resin and extra resin liquid 9
b is scraped off to adjust the film thickness. A slit 18 is formed between the support member 14 and the nozzle body 12 over the entire length in the width direction, and a dam 19 for collecting the resin liquid 9b is provided at a lower end thereof, and the excess resin liquid 9b scraped off is provided. Collect. The dam 19 is connected to a resin liquid supply tank by a pipe (not shown).

In this embodiment, a cradle 21 is arranged below the backing roll 6, and the rotating smoothing bar 8 is supported by a concave groove 22 having an arc-shaped cross section formed on the upper surface of the cradle 21 in the width direction. Has adopted. Support member 1
4, a plurality of push-pull bolts 28 are arranged in the width direction. By moving the push-pull bolts 28 partially, the height of the cradle 21 is partially adjusted to maintain the linearity of the rotating bar 8,
The core is not shaken when rotating. A leaf spring 32 is pivotally attached to the support member 14, and the lower end is urged outward by using an air tube 33.
The tip of the second member presses the doctor blade 30 to prevent indirect bending of the smoothing bar 8.
The doctor blade 31 is provided with a smoothing bar 8.
The surface of the bar 8 is always kept in a smooth state in order to remove a resin component, a solvent, and the like which are to be attached to the surface of the bar 8.

A flow path provided below the concave groove 22 of the receiving base 21
A solvent is circulated in the groove 23, and the groove 22 and the flow path 23
Through the slits 24 formed over the entire length
The agent can be desired on the groove 22. Therefore,
The resin liquid 9a to be attached to the surface of the bar 8 is
I wash it off . The support member 14 and the nozzle body 12, the nozzle body 12 and the backing roll 6, and the upper lid 1
3 and the gap formed between the backing roll 6 and the pedestal 21, as shown in FIG.
Fine adjustments can be made by using 6, 27. In the above embodiment, the air tube 33 is used as a means for urging the lower end of the leaf spring 32 that presses the doctor blade 30 outward, but a spring or the like may be used.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a conventional bar coating apparatus.

FIG. 2 is a sectional view of a main part of a bar coating apparatus according to the present invention.

[Explanation of symbols]

6 backing roll, 8 smoothing bar, 9a resin liquid, 11 resin liquid supply nozzle, 16 resin liquid supply gap,
17 Coating gap, 19 Resin recovery dam, 21 cradle,
22 concave groove, 23 solvent flow path, 31 doctor blade, 32
Leaf spring

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-246358 (JP, A) JP-A-5-114134 (JP, A) JP-A-9-192578 (JP, A) JP-A 8- 309259 (JP, A) Japanese Utility Model 62-59174 (JP, U) Japanese Utility Model 7-21155 (JP, U) Japanese Utility Model Application 61-29876 (JP, U) Japanese Patent Publication No. 6-16878 (JP, B2) 2-58-63 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05C 11 / 02,11 / 04 B05C 3/12-3/18 B05C 5/00-5 / 04 B05C 11/10

Claims (3)

(57) [Claims] 1. A smoothing bar which rotates in a groove formed in a width direction on an upper surface of a pedestal, by supplying a resin liquid in a film form to a web running along a backing roll and applying the resin liquid on the web surface. Is pressed against the coating film surface to adjust the film thickness of the coating film, a smoothing bar is provided on the downstream side of the resin liquid supply nozzle so as to contact the web running along the backing roll. Place and cradle
Push-pull bolt and smooth
A leaf spring that presses the doctor blade for the easing bar
A bar coating device that keeps the smoothing bar straight . 2. The bar coating device according to claim 1, wherein a liquid flow path is formed below and parallel to the concave groove of the receiving base, and the concave groove and the receiving base are communicated with each other by a slit. 3. From the web surface below the smoothing bar
A closed dam is provided to collect the removed resin liquid
And the dam and the resin liquid supply tank are connected.
Is the bar coating device according to 2.