JPH0110943Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a resist recovery device that is an auxiliary device in the manufacturing process of printed wiring boards. That is, the present invention relates to an apparatus that further removes and recovers resist that has been peeled off from the outer surface of a printed wiring board using a stripping solution from within the stripping solution.

In the manufacturing process of printed wiring boards, so-called resists such as etching resists and plating resists, that is, films, liquid photoresist films, inks, etc., which have properties such as acid resistance and alkali resistance, are used.
It is common practice to apply and cover a printed wiring board at a designated location, and then perform a designated operation. For example, a wiring circuit pattern is formed by covering only the copper foil circuit portion of a copper-clad laminate with a resist to protect it, and etching and corroding the remaining portion not covered with the resist, or vice versa. In addition to covering only the remaining portions other than the circuit portions with resist, plating is performed on the uncovered circuit portions. When the intended operation is completed, the resist is peeled off from the outer surface of the printed wiring board, and the printed wiring board is washed with water and then transported to the next process.

This peeling and removal of the resist is performed by mechanical processing, for example, as shown in FIG. In other words, after completing the prescribed work such as etching and plating,
A printed wiring board 2 whose intended outer surface is covered with a resist 1 is sent into a stripping chamber 4 by a roller conveyor 3, and is passed through a spray nozzle 5,
5. Stripping liquid 6 whose main component is alkali etc.
As a result, the resist 1 is peeled off from the outer surface of the printed wiring board 2. The used stripping liquid 6' is returned to the liquid tank 8 through the return pipe 7.
The stripping liquid 6 is sent again to the spray nozzles 5, 5, . . . via the supply pipe 10 by the pump 9, and is circulated and reused many times. Now, in the used stripping solution 6', the resist 1 that has been stripped and removed as described above is mixed in a suspended and precipitated state in the form of a seaweed-like glue, so it is returned to the solution tank 8. Before this, it is necessary to remove and recover the resist 1 from the stripping solution 6'.

As shown in FIG. 2, such a collection device conventionally uses a belt conveyor in which a roll 12 drives an endless belt 11 which is meshed and also functions as a filter. The used stripping solution 6' containing the resist 1 is dropped from the opening of the return pipe 7, and the resist 1 is sieved by a belt 11 and carried out in a state that is adhered thereto, and removed and collected in a collection box 13 or the like. On the other hand, the stripping liquid 6 was dropped as it was and collected into the liquid tank 8.

However, in the conventional resist collection device, the resist 1 adhering to the moving belt 11 is blown away from the belt 11 by the air nozzle 14 or the like, separated, and dropped to be removed and collected. Rather than being blown off and separated, the liquid is often conveyed while adhering to the belt 11, reaches the area where the stripping liquid 6 is falling, and is eventually washed away by the stripping liquid 6 and detached from the belt 11. It has been pointed out that the fundamental defect is that the resist 1 may fall into the tank 8 together with the stripping solution 6, and the resist 1 may be mixed in the stripping solution 6 again. That is, the stripping liquid 6 mixed with the resist 1 is transferred from the liquid tank 8 to the spray nozzle 5,
5,..., so the spray nozzle 5,5,
... becomes clogged and cannot be sprayed, or the stripping solution 6 mixed with the resist 1 is sprayed from the spray nozzles 5, 5, and the resist 1 from the printed wiring board 2 in the stripping chamber 4. This has been considered a fatal problem for resist recovery equipment, as it may be difficult or impossible to remove the resist.

In addition, in connection with this, the resist 1 mixed again in the stripping liquid 6 is transferred to the liquid tank 8, the supply pipe 10,
In particular, cleaning work is required to remove and recover the clogged spray nozzles 5, 5, etc., but this causes the entire printed wiring board manufacturing process to stop, causing problems in work efficiency, and removing the stripping liquid 6. It has been pointed out that since it has strong alkaline and other medicinal properties, such cleaning work is dangerous, and the use life of the stripping liquid 6 is shortened, and it is not easy to dispose of the waste liquid.

Furthermore, since an alkaline solution is often used as the stripping liquid 6, a so-called slip phenomenon, in which the belt 11 and its driving roll 12 slip, often occurs, and the belt 11 is prevented from sagging. It has been pointed out that it is difficult to tension the wire in a variety of ways due to its strength, and there are also drawbacks such as the lack of a decisive method to prevent meandering, which has caused problems in terms of work efficiency, work safety, and work automation.

In view of these circumstances, the present invention has been intensively researched and developed by the inventor in order to solve the problems of the conventional methods described above. It is an object of the present invention to propose a resist recovery device that can reliably remove and recover resist from a stripping solution by arranging a pipe, a nozzle, and a conveyor mechanism in a predetermined manner.

The present invention will be explained below based on the embodiment shown in FIG. 3 and below.

First, the basic configuration that characterizes the present invention will be explained.

This resist recovery device is a printed wiring board 2
The present invention relates to a recovery device for further removing and recovering the resist 1 that has been stripped and removed from the outer surface of the printed wiring board 2 using the stripping solution 6 in the stripping solution 6' in the manufacturing process. And, it is rotatable and has a cylindrical shape, and has a plurality of protrusions 15 on the inner circumferential surface for stably adhering the resist.
and a stripping solution 6' containing the resist 1 opened in the filter 16.
a return pipe 7, a nozzle 17 disposed above the filter 16, and a nozzle 17 inserted through the filter 16 to face the nozzle 17 through the filter 16, with one end 18 extending to the outside of the filter 16. It is equipped with a conveyor mechanism 19.

Next, the details of the configuration of this resist collection device will be explained.

The filter 16 is made of, for example, a cylindrical stainless steel net, and a plurality of protrusions 15 for stably adhering the resist 1 are formed on its inner peripheral surface. In the illustrated example, the protrusion 15 has a straight line facing the rotation axis and following the rotation axis, but the angle at which it stands may be inclined as appropriate, or it may have a spiral or other curved line. It may be made to form a shape.
Further, by fixing flanges 20, which are engraved frames, at both ends of the filter 16, as shown in FIG. 5, the resist 1 can be more reliably prevented from slipping out of the filter 16. The filter 16 is supported on bearing frames 21, 21 and positioned above the liquid tank 8, and is rotated in a fixed direction by rollers 23, 23 which are rotationally driven by a motor 22.

The return pipe 7 is connected to the open end 24 of this filter 16.
The end is inserted into the tip opening 25.
is located within the filter 16. This return pipe 7 is connected to a stripping solution 6' containing the resist 1 that has been stripped and removed from the outer surface of the printed wiring board 2 in the stripping chamber 4 or the like.
It functions to collect and return to the liquid tank 8.

The nozzle 17 is, for example, an air nozzle,
It is arranged directly above the filter 16, and the filter 1
Possible examples include one in which a large number of ejection ports are arranged along the rotation axis of No. 6, or one in which narrow slots are arranged like a so-called air knife.

The conveyor mechanism 19 is inserted into the filter 16 from its open end 24 and is located opposite the nozzle 17 through the filter 16, with one end 18 extending outside the filter 16, and the collection box 13 is disposed below the conveyor mechanism 19. It is set up. This conveyor mechanism 19 functions to transport the fallen resist 1 to a collection box 13 or the like outside the filter 16. In the illustrated example, the conveyor mechanism 19 includes a long box-shaped frame 26 whose top surface and the end surface on the collection box 13 side are open, and a sprocket wheel that is disposed within both ends of the long box-shaped frame 26 and rotated. 2
7, 27 and this sprocket wheel 27, 2
7, a plurality of scraping plates 29 standing from the chain 28 at predetermined intervals, and a cylinder 31 having a scraping claw 30 at the tip of a piston rod. This scraping nail 30
is arranged so as to be able to slide on the chain 28.

The resist collection device according to the present invention is configured as described above.

Next, its operation will be explained.

In the manufacturing process of the printed wiring board 2, the resist 1, which is peeled off and removed from the outer surface of the printed wiring board 2 by spraying the stripping liquid 6 in the stripping chamber 4, becomes a seaweed-like paste and is suspended and precipitated. It is mixed in the stripping solution 6', and is transported from the stripping chamber 4 to the filter 1 through the return pipe 7 together with this stripping solution 6'.
Sent into 6.

Then, the resist 1 is scooped up by the filter 16 and adheres to its inner peripheral surface, while the stripping liquid 6 passes through the filter 16 and falls to the liquid tank 8.
It fell inside and was recovered.

Since the filter 16 is rotated, the resist 1 attached to the inner circumferential surface of the filter 16 rises from below to above as the filter 16 rotates. At this time, since protrusions 15 are formed at appropriate intervals on the inner peripheral surface of the filter 16, the filter 16
The resist 1 attached to the filter 16 is held by the protrusion 15 in appropriate groups, and then the resist 1 adheres to the filter 16.
Even if the resist 1 rotates and the resist 1 also rises from below to above, the resist 1 is prevented from separating from the inner peripheral surface of the filter 16 and falling off, and stable adhesion is maintained.

In this way, the resist 1 is transferred to the filter 16.
As it rotates, it is lifted upward, but at this point, it is blown away from the inner circumferential surface of the filter 16 by air ejected from the nozzle 17, and falls away.

Then, since a conveyor mechanism 19 is arranged below this, the resist 1 is transferred to this conveyor mechanism 1.
9 and is thereby carried out of the filter 16 and collected into the collection box 13 or the like. In the illustrated conveyor mechanism 19, the resist 1 that has fallen into the long box-like frame 26 is scraped out of the filter 16 by the scraping plates 29, 29, . . . that move toward the one end 18 side. It is carried out to the storage box 13, falls from the open end of the long box-shaped frame 26 into the collection box 13, etc., and is collected. Furthermore, even if there is a resist 1 that does not fall into the collection box 13 and adheres to the chain 28 etc. and is about to be carried into the filter 16 again, the scraping claw 30 that moves forward and backward intermittently will prevent the resist 1 from being carried in. They are scraped out in the opposite direction to the conveyance direction and fall into the collection box 13.

Now, here, even if there is resist 1 that is not blown away from the inner circumferential surface of the filter 16 by the air ejected from the nozzle 17 mentioned above, it still adheres to the inner circumferential surface of the filter 16 and does not rotate. During this time, it will rotate again to the position of nozzle 17, so you will definitely be able to use nozzle 1 someday.
The air ejected from the filter 16 is blown away from the inner circumferential surface of the filter 16, and the filter 16 separates and falls.
Therefore, it will not be mixed into the stripping liquid 6 that has passed through the .

In this way, the resist 1 is transferred to the conveyor mechanism 1
9 to the outside of the filter 16 and put it in the collection box 1.
Collected to 3rd secondary school.

As explained above, the resist recovery device according to the present invention uses a rotatable, cylindrical filter, and has a return pipe, a nozzle, and a conveyor mechanism arranged in a predetermined manner, thereby removing the resist from the stripping solution. can be reliably removed and recovered, and exhibits the effects described below.

In other words, the resist is reliably removed and recovered from the stripping solution used in this way, and is prevented from being mixed in the stripping solution until it is reused.
The occurrence of serious defects in which it becomes difficult or impossible to peel and remove the resist from the printed wiring board due to clogging of the spray nozzle or the like can be reliably avoided. In addition, there is no need for dangerous cleaning work in alkaline liquid to eliminate clogging, and there is no need to stop the entire printed wiring board manufacturing process.
There are no problems such as belt sagging or meandering, so it is superior in terms of work efficiency, safety, and work automation.Furthermore, since there is no resist in the stripping solution, the usage life of the stripping solution is about 10 times that of conventional methods. It has significant effects, such as making it easier to dispose of the waste liquid and eliminating the problems that existed in conventional devices of this type.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a peeling chamber, a liquid tank, etc. in the printed wiring board manufacturing process. Figure 2 shows
FIG. 2 is a schematic front view showing a conventional resist collection device. 3 and 4 show one embodiment of the resist recovery device according to the present invention, with FIG. 3 being a schematic front view thereof, and FIG. 4 being a schematic side sectional view thereof. FIG. 5 is a perspective view showing one example of a filter. Brief explanation of symbols, 1...Resist, 2...Printed wiring board, 3...Roller conveyor, 4...
... Stripping chamber, 5... Spray nozzle, 6... Stripping liquid, 6'... Used stripping liquid, 7... Return pipe, 8
...Liquid tank, 9...Pump, 10...Supply pipe, 11
... Belt, 12 ... Roll, 13 ... Collection box,
14...Air nozzle, 15...Protrusion, 16...
Filter, 17... Nozzle, 18... One end,
19... conveyor mechanism, 20... flange, 21
... Bearing frame, 22 ... Motor, 23 ...
Roller, 24... Opening end, 25... Tip opening, 26... Long box-shaped frame, 27... Sprocket wheel, 28... Chain, 29... Scraping plate, 30... Scraping claw, 31... cylinder.

Claims (1)

[Claims for Utility Model Registration] A recovery device for removing and recovering resist that has been peeled off from the outer surface of a printed wiring board using a stripping solution in the process of manufacturing a printed wiring board, from the stripping solution, A filter that is rotatable and has a cylindrical shape and has a plurality of protrusions for stably adhering resist on its inner peripheral surface, a return pipe for a stripping solution containing resist opened in the filter, and a return pipe disposed above the filter. A resist recovery device comprising: a nozzle provided therein; and a conveyor mechanism inserted into the filter and positioned opposite to the nozzle through the filter, with one end extending outside the filter. .