JPS61118108A - Removing apparatus of water content in solvent - Google Patents

Abstract

PURPOSE:To increase the adsorption efficiency of water contained in a solvent by providing a removing and treating apparatus of water content to the outside of a solvent vessel, feeding the solvent incorporated in the solvent vessel thereinto and treating it continuously. CONSTITUTION:A solvent of a solvent vessel A is fed to a regenerator 3 via a pipe 5 and furthermore fed to a solvent vessel C via a pipe 4. The solvent is continuously taken out from the solvent vessel C and fed to a removing and treating apparatus 6 of water content via a pipe 7 wherein an adsorbent 2 for water content is incorporated in the middle of the inside. Water content is removed therein and also one part of the solvent discharged from the appara tus 6 is again returned via a shower nozzle 10 to the apparatus 6 and retreated and finally these solvent is fed to the solvent vessel C via a pipe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a moisture removal device that is capable of extremely efficiently removing moisture contained in a solvent.

<Prior art> In manufacturing printed wiring boards, a photosensitive dry film resist that is solid at room temperature is laminated on a substrate made of a conductive metal laminated board, and then baked using a negative or positive film. Printed wiring boards were manufactured by processing with a predetermined solution. However, during the process of manufacturing the above-mentioned printed wiring board, there is a water washing step immediately after removing the unpolymerized portion of the photosensitive resin composition by spraying with a solvent during the development process. Water from spray washing gets mixed into the solvent tank,
It was common for water to be present in the solvent.

However, when the water content in this solvent becomes high, the unpolymerized photosensitive resin composition, which can normally be easily removed with a solvent, comes into contact with the water in the solvent and immediately coagulates and precipitates, resulting in spot-like spots on the front surface of the substrate. There was a risk that the photosensitive resin composition would adhere. A board on which such a phenomenon has occurred will have etching spots in the next etching process, and there is therefore a risk that wiring will be short-circuited on this board, resulting in a printed wiring board that cannot be put to practical use.

Conventionally, as a method to solve this problem, as shown in FIG. , moisture in the solvent was adsorbed by this adsorbent 2. In the figure, 3 is a solvent regenerator, and 4 is a solvent tank C from which the solvent is removed from the regenerator 3.
A pipe 5 is a vibrator that feeds the solvent from the solvent tank A to the regenerator 3.

However, when the above-mentioned device is used, the moisture adsorption efficiency is low, and the amount of adsorbent 2 to be added and the number of replacements increases.The developing machine must be stopped occasionally to replace the adsorbent 2, and the adsorption rate increases. When replacing the solvent, the lid of the solvent tank C has to be opened, and the solvent comes out of the tank, creating a safety problem.

<Problems to be Solved by the Invention> The present invention fundamentally improves these conventional drawbacks, and relates to a device that continuously and efficiently removes water mixed into a solvent. It is.

Means for Solving the Problems〉 An example of the device according to the present invention will be explained in detail with reference to the drawings.
The details are as follows. That is, in Figure 1,
A, B, and C are solvent tanks, and the solvent tank C is provided with a water washing tank 1. Reference numeral 3 denotes a solvent regenerator, which is configured to feed the solvent to the solvent tank C via a vibrator 4, and also to feed the solvent from the solvent tank A to the regenerator 3 via a vibrator 5.・Next, 6 is a processing device capable of processing moisture introduced into the solvent, and a moisture adsorbent 2 is housed in the center of the processing device. 7 is a pipe capable of continuously extracting the solvent from the solvent tank C and feeding it to the processing device 6, and 8 is a pipe that allows the solvent in the processing device 6 to be delivered to the solvent tank C or the processing device 6 via a pump 9. The shower nozzle 10 is provided with a valve 11 and a valve 11, 12 in each pipe.

Function> Since the device according to the present invention is configured as described above, the solvent is continuously extracted from the solvent tank C and fed to the processing device 6 via the vibrator 7, and the adsorbent is processed in the processing device 6. At the same time, a part of the solvent discharged from the treatment device 6 returns to the treatment device 6 through the shower nozzle 10 and is reprocessed, and finally, the water contained in the solvent is removed. These solvents are fed to the solvent tank C via the vibrator 8. Therefore, by repeating the above steps, the apparatus of the present invention can continuously remove water from the solvent and constantly circulate the required amount.

<Example> In the above example, only a part of the solvent supplied from the processing device 6 through the pipe 8 was showered up by the shower nozzle IO, but as shown in FIG. It is also possible to directly shower up all the solvent in the processing device 6 via the shower nozzle 10 to further increase efficiency.

In the figure, 13 is a pump provided in the middle of the pipe 7.

Although the regenerator is omitted in FIG. 2, the regenerator is necessary in the apparatus shown in FIG. 2 as well as in the apparatuses shown in FIGS. 1 and 3.

<Effects of the Invention> As described above, the apparatus according to the present invention is provided with a processing device outside the solvent tank capable of removing water present in the solvent, and in which the solvent in the solvent tank is removed into the processing device. Since the treatment is carried out continuously by feeding, the efficiency of adsorbing water in the solvent can be significantly increased compared to the conventional equipment described above, and the water removal process can be performed continuously. Even when replacing it, there is no need to stop the developing machine from time to time like in the past, and since the entire system is a closed system, not only is there little solvent loss, but there are no health and safety issues. It has characteristics.

Next, the following table shows the processing results when using the apparatus of the present invention and when using the conventional apparatus.

Unit: ppm Adsorbent: now ex HCR- manufactured by Dow Chemical Company, USA
W 1lqr 80℃ x 3HRs Dry solvent; 1-1-1) Lichloroethane 4001 measuring device; Mitsubishi Kasei trace moisture needle CA-02 type Usually to prevent spot-like photosensitive resin composition from adhering to the entire surface of the substrate. It is necessary to reduce the water content in the solvent to 350 pp- or less, and in order to satisfy this requirement, the conventional equipment required dry running for about 2 hours or more, but the equipment of the present invention was used. In some cases, it was possible to start developing work immediately after running for about 10 minutes.

Furthermore, when using the conventional device, the defective rate of the final printed wiring board was 20/1000, but when using the device of the present invention, the defective rate could be improved to 5/1000. Ta.

[Brief explanation of the drawing]

FIG. 1 is a simplified explanatory diagram of the device according to the present invention, FIG. 2 is an explanatory diagram of the other side, and FIG. 3 is an explanatory diagram of the conventional device. A, B, C are solvent tanks, 2 is an adsorbent, 3 is a regenerator, 6 is a processing device, 9.13 is a pump, 10 is a shower nozzle, 1
1.12 is a valve.

Claims (1)

[Claims] A moisture adsorption treatment device that houses an adsorbent for moisture adsorption and has a shower nozzle on the top is provided outside the solvent tank, and the treatment device and the solvent tank are interconnected via a pipe. A solvent water removal device featuring: