KR101343788B1 - Method for recycling rf-film pba - Google Patents

Abstract

The present invention provides a method for recycling an RF-FILM PBA by separating an RF-FILM PBA connected to a liquid crystal panel or a circuit board from a panel, and removing an anisotropic conductive film (ACF) from the RF-FILM PBA. A method comprising: heating an RF-FILM PBA connected on a panel to separate the RF-FILM PBA from the panel; Visually inspecting whether the separated RF-FILM PBA is recycled; A soaking step of applying a remover to the surface ACF of the RF-FILM PBA and allowing the ACF to be called by standing for a predetermined time; A washing step of removing the called ACF of the RF-FILM PBA using a rotating brush; An ironing step of pressurizing the ACF-washed RF-FILM PBA with a heating plate including a heated iron or an iron to iron out the wrinkled portion; And visually inspecting and shipping the RF-FILM PBA from which the ACF has been removed.
According to the RF-film FB recycling method according to the present invention, the RF-FILM PBA can be easily separated from the panel without applying excessive force. The dust-free ironing process prevents the mixing of foreign substances and effectively eliminates wrinkles, thereby greatly improving the recycling rate of RF-FILM PBA.

Description

RF-FILM PBA Recycling Method {METHOD FOR RECYCLING RF-FILM PBA}

The present invention provides a method for recycling an RF-FILM PBA by separating an RF-FILM PBA connected to a liquid crystal panel or a circuit board from a panel, and removing an anisotropic conductive film (ACF) from the RF-FILM PBA. In more detail, a hot plate jig is used for an RF-FILM PBA connected to a liquid crystal panel or a circuit board (hereinafter, simply referred to as a panel), or a hot air of a hot air is blown and heated. The RF-FILM PBA which separates the RF-FILM PBA from the panel and effectively removes the ACF attached to the surface of the RF-FILM PBA through the soaking process, the washing process and the ironing process, recovers the RF-FILM PBA. This relates to a recycling method.

In general, a variety of methods, such as soldering, TAB, and COG, are used for joining electronic and electrical device components, and a method of connecting a display panel and a driving device is a soldering method using soldering and an ACF. The method used is used.

Recently, the COG or TAB method, which has advantages in price and reliability, has been widely used as an LCD driver mounting method. Such a package uses an ACF to electrically and mechanically connect the LCD pad. In addition, as the size of LCD and the high resolution of the output terminal become fine (Fine pitch) and the panel is used in driving device mounting technology such as TAB-IC and COG is increasingly important to connect using ACF.

ACF is a film-like adhesive in which conductive particles such as metal-coated plastic or metal particles are dispersed. The initial ACF is used to connect a dot matrix LCD substrate and an RF-FILM flexible printed circuit (PBA). .

On the other hand, LCD substrates using RF-FILM PBA or FPC perform a rework process when a defect occurs due to a defective driving IC, a defective TCP, or a bonding defect. The rework process is to sequentially remove the drive IC, TCP and ACF, apply new ACF, and mount the drive IC or TCP connected to the display panel through the ACF.

At this time, the RF-FILM PBA connected on the panel including the LCD substrate is also recycled, and the related RF-FILM PBA recycling method is as follows.

That is, in the conventional RF-FILM PBA recycling method, many RF-FILM PBAs are not recycled and disposed of in the process of separating the RF-FILM PBA from the panel and removing the ACF from the RF-FILM PBA.

In order to solve such a problem, the applicant of the present invention was able to solve a large part of such a conventional problem through the "FPC recycling method" of Republic of Korea Patent No. 10-0925422, but to separate the RF-FILM PBA from the panel In the process, excessive force was applied to the RF-FILM PBA, and the physical damage was frequent.

In addition, after removing the ACF, in the process of flattening the RF-FILM of the RF-FILM PBA, foreign matters are mixed, the planarization becomes poor, and the ACF bonding becomes poor during recycling.

An object of the present invention is to solve the conventional problems as described above, in the process of separating the RF-FILM PBA from the panel can be easily separated without applying excessive force to the RF-FILM PBA, after removing the ACF The RF-FILM PBA is designed to improve the recycling rate of the RF-FILM PBA and to improve the recycling rate by preventing the mixing of foreign substances in the process of flattening the RF-FILM. The film is to provide a recycling method.

In order to achieve the above object, the present invention, in the method for recycling the RF-FILM PBA,
The RF-FILM PBA connected to the panel is heated to separate the RF-FILM PBA from the panel, and the RF-FILM PBA connected to the panel is seated on top of the plate-type heating jig heated to 180 ° C. to 230 ° C., Fixing the panel by vacuum pressure through an intake hole formed in the heat generating jig, and separating the RF-FILM PBA-connected portion from the panel by heat melting;
Visually inspecting whether the separated RF-FILM PBA is recycled;
A soaking step of applying a remover to the surface ACF of the RF-FILM PBA 126 and allowing the ACF to be called for a predetermined time;
A washing step of removing the called ACF of the RF-FILM PBA using a rotating brush;
Pressing the ACF-washed RF-FILM PBA with a heating plate containing a heated iron or iron to iron out the wrinkles, the heating plate heats the temperature of the blade-type iron tip to 200 ℃ ~ 300 ℃, dust-free Ironing step to wrap the blade-type iron tip as a whole to prevent the incorporation of foreign matter, press the iron tip wrapped in dust-free to the corrugated portion of the RF-FILM PBA and ironed by reciprocating; And
The RF-FILM PBA from which the ACF has been removed is visually inspected and shipped.

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In addition, the present invention preferably the ironing step of ironing the wrinkled portion of the RF-FILM PBA to cover the dust-free paper on the wrinkled portion of the RF-FILM PBA to prevent the mixing of foreign matters, the temperature of the iron 100 ℃ ~ 200 It is heated to ℃, and pressurized reciprocating the heated iron on dust-free paper to provide an RF-film fiber recycling method to iron the wrinkled portion of the RF-FILM PBA of the dust-free base.

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According to the RF-film FB recycling method according to the present invention, in the process of separating the RF-FILM PBA from the panel, a plate-type heating jig having a heating element is used, or RF- The part where FILM PBA is connected is separated by heating and melting to 180 ~ 230 ℃.

Therefore, it can be easily separated from the panel without applying excessive force to the RF-FILM PBA, and after removing the ACF, the dust-free ironing process is used in the process of flattening the RF-FILM of the RF-FILM PBA. In addition to preventing and effectively eliminating wrinkles, the recycling rate of the RF-FILM PBA can be greatly improved.

1 is a process flow chart generally showing the RF-film FV recycling method according to the present invention.
FIG. 2 is an explanatory diagram illustrating a step of melting and separating a portion connected to an RF-FILM PBA from a panel by using a plate-type heat generating jig having a heating element built in an RF-film FV recycling method according to the present invention.
3 is an explanatory diagram illustrating a step of melting and separating the connection site of the RF-FILM PBA from the panel using a hot air fan in the RF-film FV recycling method according to the present invention.
Figure 4 is an explanatory view showing a step of pressing and reciprocating ironing on the corrugated portion of the RF-FILM PBA using a blade-type iron tip and dust-free in the RF-film FV recycling method according to the present invention.
FIG. 5 is an explanatory view showing pressurizing and reciprocating ironing on the corrugated portion of the RF-FILM PBA by using dust-free and heated iron in the RF-film FV recycling method according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

RF-FILM recycling method (1) according to the present invention is a process for effectively recycling by removing the RF-FILM PBA, as shown in FIG.

RF-FILM recycling method (1) according to the present invention first selects a panel connected to the RF-FILM PBA that can be recycled (S100).

In such a step, the panel connected to the RF-FILM PBA is selected according to the model at the designated location, and then moved to each loading place.

And next time it is received for import inspection. (S110)

In addition, the next step is to move to the import inspection waiting place, and wait by dividing line by line (S112).

In addition, the high-pressure air is injected to the panel to which the RF-FILM PBA is connected by using an air gun to clean and remove foreign substances (S114).

Then, the step of separating the RF-FILM PBA from the panel by heating the RF-FILM PBA connected on the panel (S120).

In this step, it is heated to an appropriate temperature to separate the RF-FILM PBA from the panel.

As a heating method performed in this step, as shown in FIG. 2, a plate-type heating jig 122 having a heating element may be used.

The plate-type heat generating jig 122 is provided with a heating element (not shown) such as a heating wire therein, and is heated to 180 ° C. to 230 ° C. through power supply.

The RF-FILM PBA 126 connected to the panel 124 is seated on the heating jig 122, and the panel is formed under vacuum pressure through an intake hole (not shown) formed in the heating jig 122. Secure (124).

In this state, when the portion in which the RF-FILM PBA 126 is connected to the panel 124 is melted by high temperature, the RF-FILM PBA 126 is removed from the panel 124 by using a separate separation bar 128. Isolate.

In addition, according to the present invention, the step of separating the RF-FILM PBA 126 from the panel 124 may use high temperature hot air sprayed from the hot air fan 130.

That is, as illustrated in FIG. 3, the hot air of 180 ° C. to 230 ° C. is blown from the hot air fan 130, and the panel 124 and the RF-FILM PBA 126 are seated on the table 132. 130 is reciprocated in the upper portion of the connecting portion of the panel 124 and the RF-FILM PBA 126 to inject hot hot air into the connecting portion.

When the connection part of the RF-FILM PBA 126 is melted from the panel 124 through this process, the RF-FILM PBA 126 is separated from the panel 124 using a forceps (not shown).

And the RF-film FV recycling method (1) according to the present invention is then made an import inspection step (S140).

That is, the RF-film FB recycling method 1 according to the present invention has an import inspection step for visually inspecting whether the RF-FILM PBA 126 to which the ACF is attached is recycled.

This import inspection step is determined by checking whether the operator can recycle the RF-FILM PBA (126) with the naked eye before the line input, and the RF-FILM PBA (126) that is not recyclable is disposed of (S290 ~ S300).

In addition, the method for recycling RF film FB according to the present invention (1) is applied to the surface ACF 126a of the RF-FILM PBA 126 after the import inspection step, and left for a predetermined time so that the ACF 126a is applied. It is provided with a soaking step to be called. (S150)

This soaking step (S150) is applied to the remover on the surface ACF of the primary RF-FILM PBA (126), and after a certain period of time, the adhesive locktight of the film is removed. In addition, the film is inspected, and if there is no abnormality in the film, a secondary soaking operation is performed by applying a remover to the surface ACF of the secondary RF-FILM PBA 126.

In the soaking step S150, the process of applying the remover to the surface ACF of the primary RF-FILM PBA 126 seats the PBA 126 on the jig, closes the PBA and film protective cover, and then brushes the soaking solution. Apply a soak solution by immersing the brush in contact with the adhesive locktight on the film. Then, the PBA coated with the soaking solution is put into the conveyor belt, and the soaking is performed at room temperature.

In the process of removing the adhesive locktight of the film in the PBA (126) is seated on the jig, the primary adhesive silicon is cleaned using a dust-free cloth, and further removal operation using a cleaning solution and a dust-free cloth. When the work is completed, the process is turned over.

In addition, after the remover is removed from the surface ACF of the primary RF-FILM PBA 126, the film inspection process first inspects the Loctite-adherent foreign material of the RF-FILM, and the black ink in the RF-FILM is smeared and smeared. Check if there is any. Then, the cracks and damage to the lead part are inspected, and when the inspection is completed, the process is turned over to the next process.

The process of applying the remover to the surface ACF of the secondary RF-FILM PBA is to mount the PBA 126 on the jig, close the PBA and the film protective cover, and then apply the soak solution to the stick and soak the secondary soak solution. Apply. Then, the PBA coated with the secondary soaking solution is put into the conveyor belt, and the soaking is performed at room temperature.

This soaking step (S150) is to apply a remover to the surface ACF of the primary and secondary RF-FILM PBA 126 so that the ACF is sufficiently called for at least 10 minutes, the ACF is not sufficiently called by the remover in 10 minutes or less. It may not be possible, so it is necessary to make sure that it is called sufficiently.

In this soaking step, a liquid viscous remover is applied to the surface of the ACF to be uniformly applied to facilitate the reaction with the ACF, and a self-made cleaning JIG (not shown) is used. This allows the ACF to be removed without affecting the components mounted on the RF-FILM PBA 126, namely gaskets and cushions, ICs and other materials.

In this soaking step, an ACF remover solution is applied to a region requiring application, that is, a region where an ACF to be removed is located, through a tip-shaped application unit (not shown) having a prescribed thickness and width. Therefore, the ACF remover is applied only to a specific area, thereby preventing contamination of other parts of the RF-FILM PBA 126 by the ACF remover.

The ACF remover may include methylene chloride, methanol and paraffin wax as main components, and the other components may be water or other solvents. The ACF remover is in the form of a gel, and solves the problem of being difficult to apply to a substrate since the solution was used in the prior art. The gel-type ACF remover is used to apply the desired portion of the substrate. The use of this gel-type ACF remover enables the automation of the process and offers the advantage that other parts of the substrate are not contaminated.

Among the components constituting the ACF remover, the methylene chloride acts as a chemical reaction with the ACF to swell the ACF, and the paraffin wax blocks the ACF from the outside to allow the methylene chloride to react with the ACF for a long time. To help.

When the ACF remover is applied as described above, the panel 124 is waited at room temperature for about 10 minutes so that the ACF is sufficiently called by the ACF remover. As mentioned above, when the gel-like ACF remover is applied to the TAB region, the chemical paraffin wax is volatilized into the air, and the remaining paraffin wax blocks the ACF from the outside.

Therefore, the methylene chloride remaining inside the paraffin wax is capable of swelling the ACF by continuously chemically reacting with the ACF without volatilizing to the outside by the paraffin wax.

The ACF remover application and soaking method of the present invention achieves an effect suitable for accurate quality requirements and shortening of processing time as compared to the conventional dipping method. With the soaking step of the present invention, the conventional method In comparison, the defective rate of the recycled product of the RF-FILM PBA 126 is significantly lowered.

Then, after the soaking step, a first washing step of removing the called ACF of the RF-FILM PBA 126 by using a rotating brush is performed (S160).

The first washing step is a process of rotating the brush (not shown) by a grinder (not shown) and washing the ACF. By removing the ACF by the brush while rotating the brush by using the power of the grinder, it is easy to achieve the quality level of the customer because fine work is possible.

After the first washing step, a second washing step is performed.

Such a second washing step is to remove ACF from the removed object to which the remover is removed in the first washing step more precisely, which takes the most time in the process. Therefore, in the second washing, it is preferable to spray the washing solution more than in the first washing to increase the washing effect.

In the first and second cleaning steps such as this can maximize the reduction of the process time by using the power of the brush, the operator removes from the RF-FILM PBA (126) by minimizing the contact of the RF-FILM PBA (126) ACF or remover prevents secondary contamination of other parts of the RF-FILM PBA 126 to prevent the occurrence of defective products.

On the other hand, the ACF or remover removed from the RF-FILM PBA 126 is discharged to the outside through a separate inlet (not shown), a vacuum pump (not shown) is connected to the suction port to provide a suction force. In addition, compared to the manual removal method using a manual tool such as a cotton swab has the effect that the cleaning operation is significantly improved.

Next, the acetone cleaning operation of the RF-FILM PBA 126 is performed. (S170) In this acetone cleaning operation, the acetone is cleaned by cleaning the RF-FILM PBA 126 in which the first and second cleaning operations are completed. Use only a damp cloth to clean the RF-FILM from side to side. At this time, be careful not to get acetone cleaning liquid on the part other than RF-FILM.

Next, only the PBA 126b of the RF-FILM PBA 126 is cleaned.

In such a step, the acetone-free moistened non-cheoncheon is carried out, and the acetone-non-ethanol-free cloth is picked up with forceps, and the surface of PBA 126b is cleaned. At this time, be careful not to get the acetone cleaning liquid on any part other than PBA.

After the cleaning step, a high magnification microscopy step of the lead portion of the RF-FILM is performed (S180).

In this microscope stage, process inspection is performed using a high magnification microscope of 4 to 46 magnification, and the inspection of cracks, ACF foreign matters, and contamination of other foreign matters on the lead portion of the RF-FILM is performed. If it is bad, a step of judging whether there is regeneration is made (S174).

 And after such a high magnification microscopy process inspection is made, the appearance inspection step of the PBA is made (S180).

This step focuses on the ACF removal status in the RF-FILM. In addition, parts are inspected for contamination by the cleaning liquid, the cleaning liquid, and the like, and various cracks and the like are inspected according to the PBA inspection standard.

In addition, the PFT primary function test is performed next (S190).

In this step, the RF-FILM PBA 126 product is placed in a separate jig (not shown), the RF-FILM connection is inserted into the tongs board, and the function test is performed. In addition, screen inspection should be conducted according to the standard. If the product fails in this function test step, the second function test is repeated in the same order, and the failed product is moved to the regeneration determination step (S192).

 Then, after such a functional test, a step of laser marking the RF-FILM PBA (126) product is made (S200).

In this laser marking step, a model lot number is input into a computer, and a single lot is set on a single jig (not shown) to be marked through a laser facility.

In addition, the RF-FILM PBA 126 product, which has been marked, is cleaned again with IPA.

When the marking is completed, the ironing step of pressing the RF-FILM PBA 126, which has been cleaned by ACF, with a heating plate including a heated iron tip 212 or an iron 216, irons and straightens the wrinkled portion. (S210)

This ironing step is intended to prevent a poor bonding of the recycled goods due to the wrinkle of the RF-FILM PBA (126), as shown in Figure 4, can use a blade-type iron tip (212).

That is, the blade-type iron tip 212 is heated to 200 ° C. to 300 ° C., and the blade-type iron tip 212 is entirely wrapped by using dust-free 214 to prevent the incorporation of foreign substances.

In this state, the iron tip 212 surrounded by the dust-free paper 214 is pressed against the corrugated portion of the RF-FILM PBA 126 and reciprocated to iron.

On the other hand, such an ironing step may be made by using the dust-free 214 and the iron 216. That is, as shown in FIG. 5, the dust-free paper 214 is covered on the corrugated portion of the RF-FILM PBA 126 to prevent foreign matters from being mixed, and the temperature of the iron 216 is heated to 100 ° C. to 200 ° C. The pressurized reciprocating motion of the heated iron 216 on the dust-free paper 214 will iron the corrugated portion of the RF-FILM PBA 126 under the dust-free paper 214.

Through the ironing step, it is possible to prevent the incorporation of foreign matters, and to effectively remove wrinkles, thereby greatly improving the recycling recovery rate of the RF-FILM PBA 126.

Then, after the ironing step as described above, the whole water quality inspection is executed (S220).

In this stage, the defective products are finally sorted and ready for shipment.

Then, the process of describing RFID is made, and the product is packaged and shipped or rejected by visual inspection of the RF-FILM PBA 126 from which the ACF is removed, and separately loaded and processed for return. (S280) to (S300).

In this shipping step, the ACF is removed and the iron-finished RF-FILM PBA 126 is visually inspected by the worker, and the shipment inspection goods are transferred to the next packing process, and the defective items are disposed of.

According to the RF-film FB recycling method (1) according to the present invention as described above using a plate-type heating jig 122 with a heating element in the process of separating the RF-FILM PBA (126) from the panel 124 Alternatively, by using hot air injected from the hot air blower 130, a portion to which the RF-FILM PBA 126 is connected from the panel 124 is heated to 180 ° C to 230 ° C and separated by melting.

Therefore, the RF-FILM PBA 126 can be easily separated from the panel 124 without applying excessive force. After removing the ACF 126a, the RF-FILM of the RF-FILM PBA 126 is flattened. In order to prevent the mixing of foreign matters through the ironing process of the iron tip 212 and the iron 216 using the dust-free paper 214, wrinkles are effectively removed, thereby greatly improving the recycling recovery rate of the RF-FILM PBA 126. It becomes possible.

Although the present invention has been described in detail with reference to specific embodiments thereof with reference to the accompanying drawings, the present invention is not limited to such specific structures. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the following claims. However, it is intended that the present invention covers all such modifications and variations as fall within the true scope of the invention.

1: LF-film FV recycling method
122: heat generating jig 124: panel
126: RF-FILM PBA 128: separation bar
130: hot air 132: table
126a: ACF 126b: PBA
212: iron tip 214: inexhaustible
216: iron S100 ~ S300: process step of the present invention

Claims (5)

In the method of recycling the RF-FILM PBA,
Heating the RF-FILM PBA 126 connected on the panel 124 to separate the RF-FILM PBA 126 from the panel 124, while the RF-FILM PBA 126 connected on the panel 124, The panel 124 is mounted on the plate-type heat generating jig 122 heated to 180 ° C. to 230 ° C., and the panel 124 is fixed by vacuum pressure through the intake hole formed in the heat generating jig 122. RF-FILM PBA (126) is a step of melting by melting the heat connected to (S120);
Visually inspecting whether the separated RF-FILM PBA 126 is recycled (S140);
A soaking step (S150) of applying a remover to the surface ACF 126a of the RF-FILM PBA 126 and allowing the ACF 126a to be called by leaving it for a predetermined time;
A washing step (S160) of removing the called ACF 126a of the RF-FILM PBA 126 using a rotating brush;
Pressing the RF-FILM PBA (126) washed by the ACF (126a) with a heating plate including a heated iron or an iron to iron out the wrinkled portion, and the heating plate raises the temperature of the blade-type iron tip (212) to 200 ° C. Heat to ˜300 ° C., use the dust-free paper 214 to wrap the blade-shaped iron tip 212 as a whole to prevent the incorporation of foreign matter, and the iron-tip tip 212 surrounded by the dust-free paper 214 is RF-FILM PBA (126). Ironing step (S210) to press the corrugated portion of the) and reciprocate to iron; And
RF-FILM PBA (126) is removed from the ACF (126a) to visually inspect the step of shipping (S300); RF-film film recycling method (1) comprising a. delete delete delete The ironing step 210 of claim 1, wherein the ironing step 210 of ironing and straightening the wrinkled portion of the RF-FILM PBA 126 covers the dust-free paper 214 on the wrinkled portion of the RF-FILM PBA 126. It prevents mixing, heats the temperature of the iron 216 to 100 ° C ~ 200 ° C, and pressurized reciprocating the heated iron 216 on the dust-free 214, RF-FILM PBA (below the dust-free 214) 126) A method for recycling an RF film fVA, characterized in that ironing of the wrinkled part of 126).

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