WO2016099064A1

WO2016099064A1 - Film drying device and film manufacturing system including same

Info

Publication number: WO2016099064A1
Application number: PCT/KR2015/013335
Authority: WO
Inventors: 전재형; 여정현; 박원찬
Original assignee: 주식회사 엘지화학
Priority date: 2014-12-19
Filing date: 2015-12-07
Publication date: 2016-06-23
Also published as: KR20160075164A; KR101767632B1

Abstract

Disclosed is a film drying device which can uniformly inject drying gas while the scale thereof is minimized. A film drying device according to an aspect of the present invention comprises: a transfer unit for transferring a film, on which a solvent is applied, in one direction; and an injection unit including a chamber which has a conduit part for supplying gas to the inside thereof so as to receive the gas supplied through the conduit part, and a baffle plate which has a plurality of through holes formed therein for injecting the gas received in the chamber to the outside. The film drying device is arranged such that the direction in which the injection unit injects gas is the same as the direction in which the film with the solvent applied thereon is transferred.

Description

Film drying apparatus and film manufacturing system comprising the same

The present invention relates to a film drying apparatus, and more particularly, to a film drying apparatus used for drying a solvent applied to a film and a film production system including the same.

This application is a priority application for Korean Patent Application No. 10-2014-0184808, filed Dec. 19, 2014, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.

Optical films such as polarizing plates and semi-glare (SG) films applied to liquid crystal display panels (LCDs) and the like are major optical components that provide transmitted light required for image formation.

Such a film is mainly composed of a solvent, a polymer, and fine particles, and the properties of the film depend on the change in the structure and surface shape of the fine particles. In particular, since the properties of the film can be changed depending on the change in drying conditions and drying rate, the step of drying the film can be said to be an essential step in film production.

In general, the film drying process has been carried out by a method of transporting the film by using a transport means, and supplying a drying gas in the process of transporting the film to dry the film.

By the way, in general, the dry gas supply apparatus used generally has an intake duct, an exhaust duct, etc., although it is not able to supply dry gas uniformly or evenly supplies dry gas, and was comprised by the complicated and large scale in many cases. .

In addition, in the process of conveying the film in one direction, shear stress is applied to the film. As such, when shear stress is applied to the film, fine damage is applied to the film, which affects the quality of the film. In particular, optical films are more sensitive to such damage.

Applicants have recognized, from this problem of the prior art, the need for a film drying apparatus capable of uniformly injecting dry gas while minimizing the scale of the film drying apparatus. In addition, the applicant has recognized the need for a film drying apparatus that can minimize the shear stress applied to the film in the film drying process of the film drying apparatus.

The present invention has been made to solve the above problems, an object of the present invention is to provide a film drying apparatus capable of uniformly spraying the drying gas while minimizing the scale.

In addition, another object of the present invention is to provide a film drying apparatus capable of minimizing the shear stress applied to the film in the film drying process.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

Film drying apparatus according to an aspect of the present invention for achieving the above object, the transfer unit for transferring the solvent-coated film in one direction; And an injection unit having a conduit unit for supplying gas into the chamber, the chamber including a gas supplied through the conduit unit, and a rectifying plate having a plurality of through-holes configured to inject the gas contained in the chamber to the outside. Here, the gas injection direction of the injection unit may be disposed so as to be the same direction as the transfer direction of the film to which the solvent is applied.

The plurality of through holes are each hexagonal, the plurality of through holes may form a honeycomb structure on the rectifying plate.

The rectifying plate may be a plate extending in the width direction of the film.

The conduit unit may include a first conduit disposed to be parallel to the longitudinal direction of the rectifying plate and a second conduit connected to the first conduit and extended out of the chamber.

In the first conduit, a plurality of spray holes may be formed to supply the gas supplied through the second conduit to the chamber.

The spray hole may be formed on an opposite surface of one surface of the first conduit facing the rectifying plate.

The injection unit may further include a filter interposed between the chamber and the rectifying plate.

The film drying apparatus further includes a support unit supporting the spray unit, wherein the support unit includes a support frame and at least one support column connected to one end of the support unit and the other end connected to the support frame. Can be.

The injection unit may be configured to be capable of tilting a predetermined angle about the support unit.

The injection unit may be coupled to the support pillar and the hinge.

The injection unit may be configured to be movable in the vertical direction about the support unit.

The support unit further includes a cylinder provided between the other end of the support pillar and the support frame, wherein the injection unit can be moved up and down by the lifting operation of the support pillar using the cylinder.

The film drying apparatus may further include a transport unit provided below the support unit to move the support unit in a horizontal direction.

The transport unit may include a transport wheel rotatably provided on a bottom surface of the support frame and a brake for pressing the transport wheel to suppress rotation of the transport wheel.

The conveying unit may include a conveying roll rotating about a reference axis, and the solvent-coated film may be conveyed in one direction according to the rotation of the conveying roll.

The conveying unit may further include a band wound around the conveying roll and moving in a tangential direction of the rotation direction of the conveying roll as the conveying roll rotates.

Film production system according to another aspect of the present invention for achieving the above object may include the above-mentioned film drying apparatus.

According to one aspect of the invention, there is provided a film drying apparatus that can reduce the shear stress applied to the film.

According to another aspect of the present invention, there is provided a film drying apparatus capable of injecting a gas having a uniform flow while having a simple configuration and having a constant flow rate.

According to another aspect of the present invention, there is provided a film drying apparatus that enables to set the optimum gas injection position.

In addition to the present invention may have a variety of other effects, these other effects of the present invention can be understood by the following description, it will be more clearly understood by the embodiments of the present invention.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a perspective view schematically showing a film drying apparatus according to an embodiment of the present invention.

FIG. 2 is a view of FIG. 1 as viewed from the A direction.

3 is a view showing the internal configuration of the injection unit provided in the film drying apparatus according to an embodiment of the present invention.

4 is a partially enlarged view of the rectifying plate provided in the injection unit shown in FIG. 3.

5 is a view showing the internal configuration of the injection unit provided in the film drying apparatus according to another embodiment of the present invention.

6 is a view showing a conduit provided in the chamber of the injection unit shown in FIG.

7 is a view schematically showing a film drying apparatus according to another embodiment of the present invention.

8 is a view showing a film drying apparatus according to another embodiment of the present invention.

9 is a partially enlarged view of FIG. 8.

10 is a graph showing the shear stress acting on the surface of the film.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

FIG. 1 is a perspective view schematically showing a film drying apparatus according to an embodiment of the present invention, and FIG. 2 is a view of FIG. 1 viewed from the A direction.

1 and 2, the film drying apparatus according to an embodiment of the present invention includes a transfer unit 100 and an injection unit 200.

The transfer unit 100 may transfer the film (F) coated with a solvent in one direction.

According to one embodiment, the transfer unit 100, as shown in Figures 1 and 2 having a feed roll 110, through the rotation of the feed roll 110 in one direction the film (F) Transfer. Here, the feed roll 110 may be rotated about the reference axis (110C). The feed roll 110 has a cylindrical shape and can rotate with the central axis of the cylinder as the reference axis 110C. In this case, the film F coated with the solvent may be transported along the tangential direction of the rotational direction of the feed roll 110 in a state of being wound on the feed roll 110.

According to another embodiment, the transfer unit 100 may include a transfer roll 110 and a band to transfer the film F seated on the band in one direction through the movement of the band. The band may be implemented to move as the transfer roll 110 is wound around the transfer roll 110. That is, the band can be moved along the tangential direction of the rotation direction of the feed roll 110 in a state wound on the feed roll (110). Preferably, the band is wound around at least two feed rolls 110, and can move in a tangential direction in the rotational direction of the feed rolls 110 in contact with two feed rolls 110 positioned at the outermost end. have. In this case, the film F coated with the solvent may be transported along the tangential direction of the rotational direction of the feed roll 110 in a state seated on the upper surface of the band.

The injection unit may inject a gas for drying the solvent to the outside. The injection unit will be described with reference to FIG. 3.

3 is a view showing the internal configuration of the injection unit provided in the film drying apparatus according to an embodiment of the present invention. That is, FIG. 3 can be said to be sectional drawing of B-B 'of FIG. Referring to FIG. 3, the injection unit 200 according to an embodiment of the present invention includes a chamber 230, a rectifying plate 220, and a housing 210.

The housing 210 defines an outer shape of the injection unit 200. That is, the chamber 230 may be formed in the housing 210, and the rectifying plate 220 may be disposed. For example, the housing 210 may have a structure in which one surface thereof is open, and thus the rectifying plate 220 may be provided in the open opening O. In addition, a through hole may be formed in the housing 210 to allow the conduit part 240 to be described later to penetrate, and a sealing member for sealing the conduit part 240 and the through hole may be provided on the inner circumferential surface of the through hole.

The rectifying plate 220 is formed on one surface of the injection unit 200 to allow the gas contained in the chamber 230 to be injected to the outside. To this end, the rectifying plate 220 may be formed with a plurality of through holes (220h). In addition, the rectifying plate 220 may be a plate extending in one direction, the rectifying plate 220 may be arranged to extend in the width direction of the film (F) disposed in the transfer unit 100. .

4 is a partially enlarged view of the rectifying plate provided in the injection unit shown in FIG. 3. That is, FIG. 4 can be said to be the figure which looked at the rectifying plate 220 of FIG.

As illustrated in FIG. 4, the plurality of through holes 220h formed in the rectifying plate 220 may each have a hexagonal shape. In addition, the through holes 220h may form a honeycomb structure on the rectifying plate 220 because hexagonal shapes are densely arranged. As such, the honeycomb structure makes the flow rate of the gas injected to the outside constant and allows the gas to be injected uniformly.

Referring back to FIG. 3, the chamber 230 provides a space for receiving gas for injecting to the outside. The chamber 230 may be provided with a conduit unit 240 for supplying gas into the chamber 230. That is, gas may be supplied to the chamber 230 through the conduit 240, and the supplied gas may be received in the chamber 230. Here, one end of the conduit part 240 is provided inside the chamber 230 to supply gas to the inside of the chamber 230, and the other end of the conduit part 240 is an external gas supply device, for example, compressed air. It can be connected to an air pump, which supplies it.

Preferably, the above-described injection unit 200 is preferably arranged such that the gas injection direction of the injection unit 200 is the same direction as the transport direction of the film (F) coated with the solvent. That is, as shown in Fig., It is preferable that the conveying or traveling direction of the film F and the gas injection direction is the same. The film F is subjected to a shear stress in the process of being transported, but when the gas is injected in the same direction as the transport direction of the film F, the shear stress applied to the film F may be reduced.

Also preferably, the injection unit 200 may have a structure extending in one direction. That is, the housing 210 has a structure extending in one direction, and the rectifying plate 220 disposed on one surface of the housing 210 may also have a structure extending in the same direction. And, the injection unit 200, as shown in Figures 1 and 2, it is preferably arranged to extend in the width direction of the film (F). In other words, the injection unit 200, the longitudinal direction of the injection unit 200 is preferably disposed perpendicular to the running direction of the film (F). According to this structure, the gas is evenly distributed along the width direction of the film (F) to not only dry the film (F) uniformly, but also to minimize the shear stress applied to the film (F).

5 is a view showing the internal configuration of the injection unit provided in the film drying apparatus according to another embodiment of the present invention. Referring to FIG. 5, an injection unit 200 according to another embodiment of the present invention includes a chamber 230, a rectifying plate 220, and a housing 210, and includes a chamber 230 and a rectifying plate 220. It further includes a filter 250 interposed between.

The filter 250 may remove impurities contained in the gas contained in the chamber 230. In addition, the filter 250 prevents the gas in the chamber 230 from being directly injected through the rectifying plate 220, thereby allowing the gas to be evenly distributed in the chamber 230.

5 and 6, the injection unit 200 according to another embodiment of the present invention is provided with a conduit section 240 extending in a direction parallel to the rectifying plate 220. That is, the rectifying plate 220 has a structure extending in one direction, and the conduit part 240 provided in the chamber 230 is formed of a first conduit long extending parallel to the longitudinal direction of the rectifying plate 220. 241). In addition, the conduit unit 240 may include a second conduit 242 connected to the first conduit 241 and extending out of the chamber 230. The first conduit 241 and the second conduit 242 may have a void formed therein to provide a passage for transporting the fluid.

Here, the second conduit 242 may extend to the outside of the chamber 230 to receive gas from an external gas supply device and provide a passage for delivering the supplied gas to the first conduit 241. The first conduit 241 may supply the gas supplied from the second conduit 242 to the chamber 230. That is, a plurality of spray holes may be formed in the first conduit 241. Therefore, the gas supplied through the second conduit 242 may be supplied to the chamber 230 through the plurality of spray holes. In this case, the plurality of spray holes may be uniformly distributed along the length direction of the first conduit 241.

Preferably, the plurality of spray holes, as shown in Figure 6, is formed on the outer surface of the first conduit 241, the opposite surface of one surface of the first conduit 241 facing the rectifying plate 220 Can be formed on. That is, when the rectifying plate 220 and the first conduit 241 are disposed in parallel, the outer surface of the first conduit 241 corresponding to the side where the rectifying plate 220 and the first conduit 241 face is first When referred to as one surface of the conduit 241, a plurality of spray holes may be formed on the opposite surface of one surface of the first conduit 241. According to this structure, the gas supplied to the chamber 230 through the spray hole does not proceed toward the position where the rectifying plate 220 is located, but proceeds to the opposite side of the rectifying plate 220. Therefore, the gas supplied to the chamber 230 may be evenly distributed in the chamber 230 without directly being injected to the outside through the rectifying plate 220.

7 is a view schematically showing a film drying apparatus according to another embodiment of the present invention. Referring to Figure 7, the film drying apparatus according to another embodiment of the present invention further includes a support unit 300 for supporting the above-described injection unit 200.

The support unit 300 is connected to the injection unit 200 to support the injection unit 200. The support unit 300 includes a support frame 310 and at least one support pillar 320. The support frame 310 is a basic structure of the support unit 300, may be installed on the ground. The support pillar 320 connects the support frame 310 and the injection unit 200. That is, one end of the support pillar 320 is connected to the injection unit 200, the other end of the support pillar 320 is connected to the support frame 310. More specifically, one end of the support pillar 320 is connected to the housing 210 of the injection unit 200, the other end of the support pillar 320 is connected to the support frame 310.

Here, the injection unit 200 may be configured to be tilted at a predetermined angle around the support unit 300. As shown in FIG. 7, the housing 210 of the injection unit 200 and the support pillar 320 of the support unit 300 are hinged to allow the injection unit 200 to be tilted at a predetermined angle. The injection unit 200 may be tilted to form a family register or an optimum injection angle in relation to the film F seated on the transfer unit 100.

In addition, the injection unit 200 may be configured to be movable in the vertical direction about the support unit 300. As shown in FIG. 7, the injection unit 200 may move up and down by the lifting operation of the support pillar 320 provided in the support unit 300.

According to an embodiment, the support unit 300 includes a cylinder between the other end of the support pillar 320 and the support frame 310, and selectively supplies fluid to the cylinder to move the support pillar 320 upward. It can be moved to or downward. At this time, the inside of the cylinder is provided with a piston, it may be provided with a piston rod fixed to the piston to perform a linear movement with the piston. The piston rod may exist in a separate configuration, the support pillar 320 itself may serve as a piston rod.

8 is a view showing a film drying apparatus according to still another embodiment of the present invention, and FIG. 9 is a partially enlarged view of FIG. 8.

8 and 9, the film drying apparatus according to another embodiment of the present invention is provided below the support unit 300 to move the support unit 300 and the injection unit 200 in a horizontal direction. It further comprises a transport unit (400).

According to an embodiment, the transport unit 400 may include a transport wheel 410. The transport unit 400 has a wheel frame 420 coupled to the bottom of the support frame 310. The transport wheel 410 is rotatably coupled to the wheel frame 420 through the wheel shaft 430. The transport wheel 410 may rotate about the wheel shaft 430 to move the support frame 310 in a horizontal direction with the ground.

Optionally, the wheel frame 420 may be bearing coupled to the support frame 310 of the support unit 300 to be rotatable 360 degrees (see the bearing shown in B of FIG. 9). Also, optionally, one end of the wheel frame 420 may be provided with a brake 440 rotatable at an angle about one end of the wheel frame 420. The brake 440 and the wheel frame 420 are formed with holes through which the fixed shaft 450 can be coupled, respectively, so that the brake 440 and the wheel frame 420 are penetrated by the fixed shaft 450. Rotatably coupled. The brake 440 is configured to suppress the rotation of the transport wheel 410 by pressing the transport wheel 410 by rotating a predetermined angle in one direction.

As such, the transport unit 400, by enabling the horizontal movement of the injection unit 200, it is possible to adjust the gas injection direction or injection distance. In addition, the transport unit 400, so that the installation or release of the film drying apparatus can be easily made.

Hereinafter, a simulation result showing the effect of reducing the shear stress acting on the film surface when the gas is supplied in the same direction as the traveling direction of the film will be described in brief. In addition, the simulation results below show that the smaller the height difference between the film and the spray unit (ie, the gap between the film and the spray unit, see D in FIG. 7), the smaller the shear stress on the surface of the film. .

10 is a graph showing the shear stress acting on the surface of the film. Referring to FIG. 10, the results of the simulation for the case where the gas is not injected and the height difference between the film and the injection unit as the gas is injected are shown. This simulation was carried out in such a manner that the jet direction of the gas was in the same direction as the traveling direction of the film. This simulation was performed using Fluent15, one of the flow analysis programs.

In FIG. 10, the x-axis indicates the position of the film when the position of the injection unit is 0, and the y-axis indicates the shear stress according to the position of the film. The film proceeds in the -x axis direction, and the jet direction of the gas is also in the -x axis direction.

First, if you look at the graph labeled no device, it can be confirmed that the shear stress applied to the film as a whole compared to the rest of the graph. That is, when the gas is supplied in the same direction as the running direction of the film it can be seen that the shear stress applied to the film is reduced.

Next, looking at the remaining graphs labeled Interval_1, Interval_2, Interval3, it can be seen that the shear stress applied to the film decreases as the interval decreases (where, between Interval_1 and Interval_2) The gap difference is the same between the gap_2 and the gap_3). That is, as the distance between the film and the sprayed gas is reduced, it can be confirmed that the shear stress applied to the film is reduced overall.

According to another aspect of the invention, the film drying apparatus described above may be one component of a film production system. That is, the film production system according to another aspect of the present invention may include the film drying apparatus described above. In addition to the film drying apparatus, the film manufacturing system may further include an apparatus for forming a film fabric, an apparatus for stretching a film, a coating apparatus, and the like.

The present invention, as described above, provides a film drying apparatus capable of reducing the shear stress applied to the film. In addition, the present invention provides a film drying apparatus capable of injecting a gas having a uniform flow while having a simple configuration and having a uniform flow rate. Moreover, this invention provides the film drying apparatus which can set the optimal gas injection position.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment herein can be implemented in various embodiments individually or in appropriate subcombination.

Claims

Transfer unit for transferring the solvent-coated film in one direction; And

An injection unit including a rectifying plate having a conduit for supplying gas into the chamber, the chamber for receiving the gas supplied through the conduit, and a rectifying plate having a plurality of through holes for injecting the gas contained in the chamber to the outside

To include, wherein the gas injection direction of the injection unit is a film drying apparatus, characterized in that arranged in the same direction as the conveying direction of the film coated with the solvent.
The method of claim 1,

The plurality of through holes are each hexagonal, wherein the plurality of through holes to form a honeycomb structure on the rectifying plate.
The method of claim 1,

The rectifying plate is a film drying device, characterized in that the plate extending in the width direction of the film.
The method of claim 3, wherein

And the conduit portion includes a first conduit disposed to be parallel to the longitudinal direction of the rectifying plate and a second conduit connected to the first conduit and extending out of the chamber.
The method of claim 4, wherein

And a plurality of spray holes are formed in the first conduit to supply gas supplied through the second conduit to the chamber.
The method of claim 5, wherein

And the spray hole is formed on an opposite surface of one surface of the first conduit facing the rectifying plate.
The method of claim 1,

The injection unit, the film drying apparatus further comprises a filter interposed between the chamber and the rectifying plate.
The method of claim 1,

The film drying apparatus further includes a support unit for supporting the injection unit,

The support unit, the film drying apparatus characterized in that it comprises a support frame and at least one support column is connected to the injection unit and the other end is connected to the support frame.
The method of claim 8,

The spray unit, the film drying apparatus, characterized in that the tilting of the predetermined angle around the support unit.
The method of claim 9,

The spray unit, the film drying apparatus, characterized in that the hinge coupled to the support pillar.
The method of claim 8,

The spray unit, the film drying apparatus, characterized in that movable in the vertical direction around the support unit.
The method of claim 11,

The support unit further includes a cylinder provided between the other end of the support pillar and the support frame,

The spray unit, the film drying apparatus, characterized in that the vertical movement by the lifting operation of the support pillar using the cylinder.
The method of claim 8,

The film drying apparatus, the film drying apparatus further comprises a transport unit which is provided in the lower portion of the support unit for moving the support unit in the horizontal direction.
The method of claim 13,

The transport unit, the film drying apparatus characterized in that it comprises a transport wheel rotatably provided on the bottom surface of the support frame and a brake to press the transport wheel to suppress the rotation of the transport wheel.
The method of claim 11,

The conveying unit has a conveying roll that rotates about a reference axis,

The film coated with the solvent is a film drying apparatus, characterized in that conveyed in one direction according to the rotation of the transfer roll.
The method of claim 15,

The conveying unit, the film drying apparatus characterized in that it further comprises a band wound in the tangential direction of the rotational direction of the conveying roll as the conveying roll is wound around the conveying roll.
A film production system comprising the film drying apparatus according to any one of claims 1 to 16.