JP2002018339A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating device having no remaining portion of a coating liquid in a liquid storing part of the inside of a die. SOLUTION: The liquid storing part 34 formed to penetrate to the inside of the die 14 in the width direction in the lip coater type coating device 10 is provided and a left side wall 36 and a right side wall 38 freely movable in the left and right direction are provided in the inside of the liquid storing part 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a coating liquid on a web such as a film or a cloth.

[0002]

2. Description of the Related Art As a coating apparatus for coating a web W with a coating liquid, a lip coater type coating apparatus 1 as shown in FIG.
00 is known.

In the coating apparatus 100, a die 114 is disposed below a web W that travels in the front-rear direction by a backup roll 112. The die 114 includes a head body 130 and a lid 132 attached to a rear surface of the head body 130. A concave portion is provided on the front surface of the lid 132, and the liquid reservoir 116 for the coating liquid is formed by combining the head body 130 and the lid 132. Then, the coating liquid is discharged from the liquid storage section 116 to the upper side of the die 114 through the liquid sending section 118.

Above the die 114, there is a coating space 124 formed by an arc-shaped edge 120 and a back plate 122. Then, the coating liquid discharged from the above-mentioned liquid sending part 118 is applied to the arc-shaped edge part 12.
The coating liquid is applied to the web W flowing along the line 0 and traveling below the backup roll 112 at the upper end of the edge portion 120.

[0005]

FIG. 6 shows a coating apparatus 10.
0 is a longitudinal sectional view as viewed from the front.

As shown in FIG. 1, a liquid reservoir 116 is provided in the die 114 in the width direction. When the width of the coating liquid is smaller than that of the liquid reservoir 116, the liquid is applied. Are fitted with plate-like sealing materials 126, 126 respectively in the liquid feeding sections 118 located on both sides of the die 114, and furthermore, a pair of left and right lateral walls 128 for closing the gap between the backup roll 112 and the upper surface of the die 114. , 128 are attached.

[0007] With the above structure, the coating width applied to the web W is between the horizontal walls 128, 128, and the coating liquid is not applied to a wider portion.

[0008] However, the coating apparatus 100 having the above-described structure is used.
In this case, since the position of the pair of left and right seal members 126 is provided at a position narrower than the width of the liquid reservoir 116, a portion where the coating liquid stays on both sides of the liquid reservoir 116 occurs.

[0009] The coating liquid in the stagnant portion has a problem in that it does not flow and thus is deteriorated and a dispersion in the coating liquid is settled.

When the defective coating liquid is applied to the coating surface, there is a problem that the web W itself becomes defective.

Further, conventionally, in order to solve such a problem, a plurality of lids 132 in which the size of the liquid reservoir 116 in the width direction is changed have been prepared.

However, with such a structure, the lid 13
In addition, there is a problem that it is necessary to make a plurality of the two, and the combination accuracy of the lid 132 and the head main body 130 is reduced.

Accordingly, the present invention has been made in view of the above problems, and provides a coating apparatus in which no coating liquid stays in a liquid reservoir inside a die.

[0014]

According to a first aspect of the present invention, there is provided a coating apparatus for coating a coating liquid with a die in a width direction of a web traveling in a front-rear direction. The liquid reservoir is provided along the width direction, and left and right side walls of the liquid reservoir are arranged movably along the width direction, so that the size of the liquid reservoir in the width direction can be changed. It is a coating apparatus characterized by the above.

According to a second aspect of the present invention, there is provided the coating apparatus according to the first aspect, wherein the liquid reservoir has a circular cross-sectional shape, and the left and right side walls are cylindrical.

According to a third aspect of the present invention, there is provided the coating apparatus according to the first or second aspect, wherein the coating apparatus is a lip coater.

According to a fourth aspect of the present invention, there is provided the coating apparatus according to the first or second aspect, wherein the die is a discharge die.

According to the coating apparatus of the present invention, by moving the both side walls of the liquid reservoir inside the die in the width direction, a liquid reservoir corresponding to the coating width of the web can be formed. In addition, no stagnation portion of the coating liquid is formed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A coating apparatus 10 according to a first embodiment of the present invention will be described with reference to FIGS.

In the lip coater type coating apparatus 10, a die 14 having a comma type edge portion 20 is disposed below a backup roll 12. Above the die 14, there is a coating space 24 formed by the edge portion 20, the back plate 22, and the lateral walls 28, 28 located on the left and right sides.

The die 14 is a combination of a head body 30 and a lid 32, and has a liquid reservoir 34 having a circular cross section penetrating in both the left and right directions. The coating space 2 passes from the liquid reservoir 34 through a slit-shaped liquid feeder 18 provided in the width direction.
Then, the coating liquid is discharged to the step 4.

A pair of left and right side walls 3 are provided inside the liquid reservoir 34.
6, 38 are provided. Since the liquid reservoir 34 has a circular cross section, the left and right side walls 36 and 38 have a cylindrical shape, and have a cylindrical shape. As shown in FIG. 1, the inner walls of the left and right side walls 36 and 38 are formed in an arc shape, and have a smooth shape such that the upper part spreads upward.
O-rings 40 and 42 are provided to prevent the coating liquid from leaking from between the left and right side walls 36 and 38 and the inner peripheral wall of the liquid reservoir 34.

Screw portions 44 and 46 are provided on outer walls of the left and right side walls 36 and 38, and the screw portions 44 and 46 are screwed into fixing plates 48 and 50 provided on both side walls of the die 14, respectively. The left and right side walls 36 and 38 are fixed so as not to move due to the pressure of the coating liquid inside the liquid reservoir 34.

A supply port 52 for supplying a coating liquid is provided at the center of the lid 32.

A preparation state of the coating apparatus 10 having the above-described configuration until coating is described.

First, the left and right side walls 36, 38 are moved in accordance with the coating width of the web W to be coated. In this case, the screw parts 44 and 46 are rotated and moved. The distance between the left and right side walls 36 and 38 is adjusted to the coating width of the web W to be coated.

Next, the sealing material 26,
26 is inserted between the liquid feeding sections 18.

Next, a pair of lateral walls 28, 2 are provided between the backup roll 12 and the upper surface of the die 14 according to the width.
8 is attached.

Thus, each seal portion can be adjusted according to the coating width of the web W to be coated.

Then, when the coating liquid is supplied from the supply port 52 and the backup roll 12 is rotated, the coating liquid is applied only to a required width.

In this case, since there is no portion where the coating liquid stays in the liquid reservoir 34, there is no problem that the coating liquid is deteriorated as in the prior art. Also, the lid 32 may be made of one type, and the cost can be reduced.

(Second Embodiment) In the above embodiment, the lip coater type coating apparatus 10 has been described. However, the present invention is not limited to this, and a coating apparatus 60 having a discharge die 56 as shown in FIG. May be.

That is, the coating liquid is discharged from the discharge port 58 at the upper end of the die 56 onto the lower surface of the web W conveyed by the backup roll 54 for coating.

In this case, a liquid reservoir 62 having a circular cross section is provided inside the die 56, and the liquid reservoir 62 is connected to the liquid reservoir 62.
The coating liquid is applied from the discharge port 58 through 4. A column-shaped left side wall 36 and a right side wall 38 are provided in the liquid reservoir 62 in the same manner as in the first embodiment, and the left and right side walls 36, 38 are moved according to the coating width of the web W. .

Even with this structure, there is no stagnant portion of the coating liquid inside the liquid reservoir 62.

(Modification) In the above two embodiments, the cross sections of the liquid reservoirs 62, 34 are circular, and the left side walls 36, 38 are formed.
Has a columnar shape, but the cross-sectional shape of the liquid reservoir may be a square, a triangle, or a polygon, and both side walls may be formed in accordance with the shape.

[0037]

As described above, according to the coating apparatus of the present invention,
Since the size of the liquid reservoir in the width direction can be changed according to the coating width of the web W, there is no stagnation portion of the coating liquid, and no deterioration of the coating liquid occurs. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a coating apparatus according to a first embodiment.

FIG. 2 is a longitudinal sectional view of the coating apparatus.

FIG. 3 is a longitudinal sectional view of the coating apparatus according to the first embodiment.

FIG. 4 is a longitudinal sectional view of a coating apparatus according to a second embodiment.

FIG. 5 is a cross-sectional view from the side of a conventional coating apparatus.

FIG. 6 is a cross-sectional view from the front of a conventional coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coating apparatus 14 Die 34 Liquid storage part 36 Left side wall 38 Right side wall

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shigeyoshi Kobayashi F-term (reference) 4F041 AA12 AB01 BA05 BA12 BA32 BA34 BA56 CA02 CA12 CA16 CA22 CA 4CA04 BA08 CB03 CB24

Claims (4)

[Claims] 1. A coating apparatus for applying a coating liquid by a die in a width direction of a web traveling in a front-rear direction, wherein a liquid reservoir for the coating liquid is provided inside the die along the width direction. A coating device, wherein left and right side walls of the liquid reservoir are movably arranged along the width direction, and the size of the liquid reservoir in the width direction can be changed. 2. The coating apparatus according to claim 1, wherein said liquid reservoir has a circular cross section, and said left and right side walls are cylindrical. 3. The coating apparatus according to claim 1, wherein said coating apparatus is a lip coater. 4. The coating apparatus according to claim 1, wherein said die is a discharge die.