TWI403366B - Coating device and coating method - Google Patents

Abstract

Intended is to homogenize stably the clearance between the tip lip of an applying die and a web. Provided is an applying apparatus for applying an application liquid to a moving web from the tip lip of the applying die fixed on a bed. The applying apparatus is characterized in that a plurality of shims fixed on the bed by bolts are arranged in that joint zone of the jointing face of the bed which is to be jointed to the applying die, so that the straightness of the tip lip of the applying die is adjusted by adjusting the individual thicknesses of the shims arranged.

Description

Coating device and coating method

The present invention relates to a coating apparatus and a coating method, and more particularly to a pigment emulsifier, a magnetic liquid, a viewing angle enhancement film, a reflection preventing film solution, a color filter pigment liquid, which are used to form a surface. A coating liquid such as a solution of a protective film is applied to a coating device and a coating method for a support such as a plastic film, paper, or metal foil.

A method of applying a coating liquid to the surface of a moving support (sheet or the like) is known as a squeeze coating method. In recent years, with the improvement of the performance of a film formed by the extrusion coating method, it is required to form a laminated film having a relatively thin lubricating film thickness of 20 [μm] or less and a high precision. To form such a film uniformly, the accuracy of the coating device, particularly the clearance between the front lip and the sheet, is very important.

This gap is not only affected by the ambient temperature, but also strongly affected by the manufacture of the coating device. The width of the coated sheet should be uniform, and the final adjustment is required. Patent Document 1 and Patent Document 2 disclose a method of connecting a coating die to a gantry of a fixed coating die by a plurality of pressing bolts and pulling bolts, and adjusting a gap between the front lip and the sheet by adjusting the pressing bolt and the pulling bolt. .

[Patent Document 1] Japanese Patent Laid-Open Publication No. 6-142588

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-270877

However, the inventions disclosed in Patent Document 1 and Patent Document 2 can be used. The adjustment of the gap between the front lip and the sheet is performed. However, the adjustment of the bolt for pressing the bolt and the pulling bolt is such that the general bolt has a gap or the like, so that it is not easy to adjust the position correctly, and the reproducibility of the adjustment is insufficient. It is necessary to repeat the adjustment of the bolt until the success of the accident. Moreover, the adjustment of such a bolt is subjected to vibration of a rotating body of the coating device, and the bolt is loosened during the application, the gap is changed, the coating liquid cannot be uniformly applied, or the sheet is damaged. There are a lot of problems.

The present invention has been made in view of the above problems, and provides a coating apparatus and a coating method which can easily adjust the position of a gap and have a small change in the gap in the coating step.

A coating apparatus according to a first aspect of the present invention is characterized in that a coating liquid is applied to a moving sheet from an end lip before being fixed to a coating die of a gantry, and is characterized in that the bonding surface of the gantry is bonded to the bonding surface of the coating die. a plurality of shims having holes or notches through which the bolts for bonding the coating die and the gantry are coupled; and adjusting the thickness of each of the shims disposed to adjust the thickness of the end lip before the coating die degree.

According to a second aspect of the invention, in the coating apparatus of the first aspect, the joining region is formed to have a projection in a direction of a coating die of the joining surface of the gantry.

According to a third aspect of the present invention, there is provided a coating apparatus according to the first aspect or the second aspect, characterized in that the width of the shims in a direction perpendicular to a moving direction of the sheet is 1.2 times to 7 times the diameter of the bolt. Times.

According to a fourth aspect of the present invention, there is provided a coating apparatus according to any one of the first aspect to the third aspect, characterized in that: it is disposed on a joint surface of the gantry The shims are four or more, and the total width of the shims used in the direction perpendicular to the moving direction of the lamella is less than or less than half of the total width of the lands of the lands. .

According to a fifth aspect of the invention, there is provided a coating apparatus according to any one of the first aspect to the fourth aspect, characterized in that: the gantry has a plurality of columns, and the plurality of columns are formed from the coating die toward the fixing. In the direction of the fixing table of the gantry, the joining regions are formed in a region which is the end of the column.

According to a sixth aspect of the present invention, there is provided a coating apparatus according to any one of the first aspect to the fifth aspect, characterized in that all faces of the region which is the other end of the column or all of the faces other than the both ends It is in close contact with the aforementioned fixed table.

According to a seventh aspect of the invention, there is provided a coating apparatus according to any one of the first aspect to the sixth aspect, characterized in that the shims are made of SUS steel.

An eighth aspect of the present invention is characterized by a coating method characterized in that a support roller for winding a sheet disposed adjacent to an end lip of the coating die is rotated, from the first aspect to the seventh aspect The front lip of the coating device described in one aspect supplies the coating liquid to the sheet which is moved by the rotation of the support roller.

As described above, according to the coating apparatus and the coating method of the present invention, since the gap can be easily adjusted and the change in the gap of the coating step is small, the coating liquid can be applied to the sheet stably and uniformly.

[Coating device]

An embodiment of the coating apparatus of the present invention will be described with reference to Fig. 1.

Fig. 1 is a plan view of the coating apparatus of the present embodiment. A cross-sectional view taken straight away, and Fig. 2 is a perspective view of the coating apparatus of the present embodiment.

In the coating apparatus of the present embodiment, the support roller 14 is wound around the continuous running sheet 15, and the coating die 12 is placed close to the support roller 14, and the coating liquid 16 is applied from the coating die 12 to the sheet 15.

The coating die 12 is joined to the gantry 11 directly or by a shim 13 made of SUS steel. A hole or a notch for fixing the coating die 12 to the gantry 11 is formed in the center of the shims 13, and a screw hole for fixing the gantry 11 is formed in the coating die 12. The coating die 12 is fixed to the gantry 11 by bolts 22 via the holes or the notches. Further, the gantry 11 is fixed to the fixed table 23. In addition, in the present embodiment, the shim sheet 13 made of SUS steel is used, but it is not particularly limited as long as it is a material having a small change over time and having high rigidity.

To apply the coating liquid 16 uniformly to the sheet 15, as described above, the interval between the support roller 14 and the end lip 12a of the coating die 12, that is, the gap is preferably uniform. Therefore, the plurality of shims 13 are inserted between the gantry 11 and the coating die 12, and by changing the thickness of each of the inserted shims 13, the straightness of the front end of the front lip 12a of the coating die 12 is adjusted, and the support roller 14 is adjusted. The interval between the end lips 12a before the coating die 12 is uniform. The details are described in the third and fourth figures. Fig. 3 is a cross-sectional view in which the sheet width direction of the coating apparatus of the present embodiment is cut in parallel, and Fig. 4 is an enlarged view thereof. As shown in Fig. 3, the coating die 12 and the gantry 11 are joined by a plurality of shims 13. In order to adjust the true straightness of the end lip 12a before the application of the mold 12, the film thickness of each of the shims 13 is different, and the adjustment is performed. The position of each shim 13 is equivalent to the column 21 provided on the gantry 11 for ensuring strength. The position is at the position of the end surface of the coating die 12. Specifically, an end portion of the column 21 on the side of the coating die 12 for ensuring the strength of the stage 11 provided between the fixing table 23 of the fixed stage 11 and the coating die 12 is formed to increase the area of the end of the column 21. The convexity of the reproducibility of the contact is such that the coating die 12 is fixed to the gantry 11 by the shim 13 in this region. At the end of the column 21 of the gantry 11, since the coating die 12 is fixed, the gantry 11 is not deformed by the weight of the coating die 12 or the like, and the straightness of the end lip 12a before the coating die 12 can be stably improved.

On the other hand, as shown in Fig. 3, since the other end surface of the post 21 of the gantry 11 is in contact with the surface of the fixing table 23 except for the posts 21 at both ends, it becomes the contact surface 25, so the coating die 12 is applied. The force affected by the weight or the like is applied to the surface of the fixing table 23 through the post 21 of the gantry 11. Therefore, the deformation of the gantry 11 due to the weighting of the coating die 12 is extremely small, and the fixing table 23 is made of a material which is not deformed, and the straightness of the end lip 12a before the application of the mold 12 is not changed. In the present embodiment, in order to prevent movement due to vibration or the like, the gantry 11 and the fixed table 23 are fixed by four bolts. Further, all the faces of the other end faces of the posts 21 of the gantry 11 may be brought into contact with the surface of the fixing table 23.

With the above configuration, it is only necessary to perform the adjustment of the shims 13 once, and it can be used in the original state for a long period of time.

As a result of the review by the inventors, the width of the coating die 12 of the column 11 of the gantry 11 in the width direction (the width in the width direction of the sheet) is preferably 1.4 times or more of the nominal diameter of the bolt, and is 20 [mm] or more and 100 [mm]. 〕the following. This is because if the gantry 11 is not deformed, it needs to be 1.4 of the nominal diameter of the bolt. More than double, and the width is above 20 [mm]. In addition, when the gantry 11 does not form the column 21, and the gantry 11 is formed into a total bulk shape, the weight of the gantry 11 is relatively heavy, and it is difficult to perform when moving or finely adjusting, and at the same time, due to the weight of the gantry 11 There is a situation of deformation, so the structure is not properly called. Therefore, the width of the column is preferably 100 [mm] or less.

Further, since the shim 13 is disposed on the end surface of the column 21 on the side of the coating die 12, and the straightness of the end lip 12a before the coating die 12 is adjusted, the number of the shim 13 to be provided must be four. the above. This is because if the number of shims is three or less, fine adjustment of the straightness of the end lip 12a before the shims cannot be performed.

Usually, the notch 26 is provided in the gantry 11, but since the column 21 of the gantry 11 is supported by the structure penetrating from the coating die 12 to the fixing table 23, it is preferable to be formed on the surface other than the contact surface 25 of the end of the column 21. Further, there is also a structure in which the gantry 11 of the notch 26 is not formed. In this case, the fixing table 23 and the gantry 11 form the contact surface 25 in a wide range.

(coating method)

Next, the coating method of the present invention will be described based on Fig. 1 . The coating method of the present invention uses the above-described coating apparatus of the present invention. Specifically, the coating liquid 16 supplied to the coating die 12 is supplied to the end die lip 12a before the coating die 12 by the slit formed in the coating die 12. The front end lip 12a of the coating die 12 is disposed adjacent to the continuously running sheet 15 by the support roller 14, and is disposed with a predetermined gap. The coating liquid 16 forms a fine bead between the end lip 12a and the sheet 15 before the coating die 12 is applied. One side is applied to the sheet 15. The gap at the time of coating is across the entire width of the sheet 15, preferably 3 [μm] or less, the straightness of the end lip 12a before the coating die 12 is adjusted by the shim 13 to be limited to this range.

Moreover, the viscosity of the applied coating liquid 16 is preferably in the range of 0.1 to 1000 [p] (0.01 to 100 [Pa.s]), more preferably 1 to 100 [p] (0.1 to 10 [Pa.s]). .

The sheet 15 to which the coating liquid 16 has been applied is subjected to a drying treatment and a rolling treatment, and then temporarily wound into a roll shape, and is directly heated in a roll form or hardened by UV irradiation. The hardened sheet 15 is cut into an elongated shape with a predetermined width to become a film photosensitive material, a magnetic recording medium, a PS plate, an optical functional film or the like.

Moreover, the coating apparatus and the coating method of the present invention can apply a liquid crystal, a magnetic material, a film sensitizer, an organic EL, a pigment material, an adhesive material, a conductive material, an insulating material, and the like.

In the above, the present invention is not limited to the above examples, and various modifications and changes can be made without departing from the scope of the invention.

[Examples]

Next, the test results comparing the examples of the present invention with the comparative examples will be described.

(1) The conditions of the coating die and the stand of the examples are as follows.

(coating mold)

The coating die was a die having a total length of 1400 mm and an effective coating width of 1,250 mm.

(shelf)

When the gantry is used for a total length of 1200 mm, a gantry in which the nominal diameter of the fixing bolt, the number of columns, and the number of the fixing bolts are changed is mounted, and a coating die is mounted to measure the straightness of the tip end of the lip.

(2) On the other hand, the conditions of the coating die and the gantry of the comparative example are as follows.

(coating mold)

In the same manner as in the examples, a mold having a total length of 1400 mm and an effective coating width of 1,250 mm was used as the coating die.

(shelf)

The gantry was formed in the same manner as the embodiment. However, the fixing and straightness adjustment of the coating die were carried out by using a pull-tab without using a shimming piece.

(3) The measurement of the straightness is performed as follows.

[Measurement of Trueness]

The straightness is such that the coating die is opposed to the front surface of the supporting roller, and the interval between the front end of the lip and the supporting roller is measured by a thickness gauge, and the maximum value and the minimum value of the interval are obtained.

[linear]

The ratio of the amount of adjustment of the shim or the pull bolt to the amount of movement of the front end of the lip is defined as linear. For example, when the thickness of the shims A and B is tA and tB, the initial value of the front end of the lip at this time is dA and dB with respect to the movement amount, and linear = (dB - dA) / (tB - tA) × 100 (%) definition.

〔test results〕

The test results of the above examples and comparative examples are shown in Fig. 6. Evaluation When the result of both linearity and true straightness is ◎, either linearity or trueness is preferably Δ○ or ○, and the result of both is ×.

As can be seen from Fig. 6, the linearity of the first to sixth embodiments of the present invention in which the straightness is adjusted by the shims is 65% or more, and the distance between the front end of the lip and the supporting roller is also 5.2 μm at the maximum, and good linearity can be obtained. And straightforwardness. In the first to sixth embodiments, in particular, the width of the shims in the direction perpendicular to the moving direction of the sheet is 1.2 to 7 times the diameter of the bolt ("magnification" in Fig. 6) and the number of columns of the gantry is 4 The first, third, and fifth examples of the above conditions are good results of ◎.

On the other hand, in the comparative example in which the straightness is adjusted by the pressing bolt, the linearity is 55%, which is smaller than that of the sixth embodiment, and the interval between the front end of the lip and the supporting roller is as large as 12.0 μm, and the linearity and the straightness are neither Good result.

11‧‧‧ 台台

12‧‧‧Application mould

12a‧‧‧ front lip

13‧‧‧fill

14‧‧‧Support roller

15‧‧‧Sheet

16‧‧‧ Coating solution

21‧‧ ‧ column

22‧‧‧ bolt

23‧‧‧ fixed table

25‧‧‧Contact surface

26‧‧‧ gap

Fig. 1 is a cross-sectional view perpendicular to the direction of the sheet of the coating apparatus of the embodiment of the present invention.

Fig. 2 is a perspective view of a coating apparatus according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view parallel to the direction of the sheet of the coating apparatus of the embodiment of the present invention.

Fig. 4 is an enlarged view of a cross section parallel to the direction of the sheet of the coating apparatus of the embodiment of the present invention.

Fig. 5 is a cross-sectional view taken in the direction parallel to the sheet of the coating apparatus of another embodiment of the present invention.

Fig. 6 is a table showing the results of tests of the examples and comparative examples of the present invention.

11‧‧‧ 台台

12‧‧‧Application mould

13‧‧‧fill

21‧‧ ‧ column

22‧‧‧ bolt

23‧‧‧ fixed table

25‧‧‧Contact surface

26‧‧‧ gap

Claims (8)

A coating device for applying a coating liquid onto a moving sheet from an end lip before being applied to a coating die of a gantry, wherein: a plurality of bonding regions are disposed on a bonding surface of a bonding surface of the gantry and the coating die; A shims of holes or notches through which the bolts of the coating die are combined with the gantry are adjusted; and the thickness of the nip which is disposed is adjusted to adjust the straightness of the end lip before the coating die. The coating apparatus according to claim 1, wherein the joining region is formed by forming a projection in a direction of a coating die of the joining surface of the gantry. The coating device according to claim 1 or 2, wherein the width of the shims in a direction perpendicular to a moving direction of the sheet is 1.2 to 7 times the diameter of the bolt. The coating device according to claim 1 or 2, wherein the shims disposed on the joint surface of the gantry are four or more, and the shims used are in a direction perpendicular to the moving direction of the sheet. The joint width is equal to or less than half of the total of the width of the gantry joint surface perpendicular to the sheet moving direction. The coating device of claim 1 or 2, wherein the gantry has a plurality of columns formed in a direction from the coating die toward a fixing table for fixing the gantry, wherein the bonding regions are formed Become the area on the end of the aforementioned column. A coating apparatus according to claim 5, wherein all the faces of the region which becomes the other end of the column or all faces except the both ends are in close contact with the fixing table. A coating apparatus according to claim 1 or 2, wherein the shims are made of SUS steel. A coating method, which is characterized in that a supporting roller for winding a sheet which is disposed close to an end lip of the coating die before the coating die is rotated, and the coating device according to any one of the above claims The front lip supplies the coating liquid to the aforementioned sheet that moves in accordance with the rotation of the support roller.