TWI383832B - Defoaming device - Google Patents

Description

Defoaming device

The present invention relates to the field of circuit board manufacturing, and in particular to a defoaming device capable of effectively removing foam.

With the advancement of science and technology, printed circuit boards are widely used in the field of electronics. For application of the circuit board, please refer to the literature Takahashi, A. Ooki, N. Nagai, A. Akahoshi, H. Mukoh, A. Wajima, M. Res. Lab, High density multilayer printed circuit board for HITAC M-880, IEEE Trans On Components, Packaging, and Manufacturing Technology, 1992, 15(4): 418-425.

In the production process of the circuit board, an etched copper foil is usually used to form a conductive line. Before etching to form a conductive line, it is necessary to form a photoresist layer before the surface of the copper foil, and then expose and develop the photoresist layer, thereby patterning the photoresist layer. When developing, development is usually carried out using a developing solution such as a potassium carbonate solution, and the developing solution reacts with a photoresist which does not undergo a chemical reaction during exposure, so that the reacting photoresist is detached from the surface of the copper foil. During the reaction between the developer and the photoresist layer described above, a large amount of foam is usually generated, and as the reaction proceeds, the foam is gradually increased, so that the foam flows out of the developing machine, which affects the normal developing process.

In the prior art, chemicals are usually used to remove the generated foam, and the above-mentioned defoaming chemicals cause environmental pollution and are expensive, which is disadvantageous for reducing the production cost of the circuit board.

In view of this, it is necessary to provide a defoaming device capable of effectively removing foam.

A defoaming device will be described below by way of examples.

A defoaming device includes a receiving tank, a foaming tank, a liquid storage tank and a recovery pump. The receiving slot is for receiving a liquid with a foam. The squeezing tank is connected to the accommodating groove for accommodating a mixture or a liquid of a foam and a liquid flowing from the accommodating groove, and the squeezing tank has a first side plate adjacent to the receiving groove, the first The side panel has at least one stepped structure in a vertical direction, and the liquid with foam in the receiving groove flows into the blistering groove along the first side plate, and the at least one stepped structure is used to make the foam along the first The one side plate is broken into liquid when it flows into the snubber groove. The liquid storage tank is in communication with the foaming tank for accommodating a mixture or liquid of foam and liquid flowing from the foaming tank. The recovery pump is connected between the liquid storage tank and the receiving tank for conveying a mixture or liquid of foam and liquid in the liquid storage tank to the receiving tank.

Compared to the prior art, the defoaming device provided by the present embodiment, the foam can cause most of the foam to be broken by flowing along the first side plate having the step, and the foam is completely converted into a liquid by the impeller of the recovery pump. Thus, the defoaming device can cause most of the foam to break the foam by flowing through the stepped first side plate, which can save energy, and the liquid which can realize foam conversion can be recycled.

The defoaming device provided by the technical solution will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 and FIG. 2 together, the first embodiment of the present invention provides a defoaming device 100 including a receiving slot 110, a foaming tank 120, a first connecting pipe 130, a liquid storage tank 140, a second connecting pipe 150, and recycling. The pump 160, the third connecting pipe 170, the liquid level detecting device 180, and the controller 190.

The receiving tank 110 accommodates a liquid with a foam, which may be a tank for accommodating the developing, etching or stripping of the syrup. With the processing such as development, etching or stripping, the receiving tank 110 is continuously foamed. produce. In this embodiment, the receiving groove 110 is a rectangular parallelepiped groove having an opening 113 at the top, and has a bottom wall 111 and four side walls 112 connected to and perpendicular to the bottom wall 111. Above the opening 113, a developing, etching or stripping device is usually provided so that the liquid having the foam after the treatment is injected into the receiving groove 110 from the opening 113. A first through hole 114 is defined in a side wall 112 of the receiving groove 110 near one side of the opening 113. In this embodiment, the first through hole 114 has a rectangular shape and a longitudinal direction parallel to the bottom wall 111. Preferably, the first through hole 114 is opened at a position corresponding to the position of the foam accommodated in the receiving groove 110. That is, the liquid level of the liquid in the receiving groove 110 is below the lowest point of the first through hole 114 so that only the foam can flow out from the first through hole 114. The shape of the receiving groove 110 is not limited to the shape provided in the embodiment, and may be designed to be other shapes suitable for accommodating liquid according to actual needs.

In this embodiment, in order to facilitate communication between the receiving groove 110 and the foaming groove 120, the receiving groove 110 further has an extending portion 115. The shape of the longitudinal section of the extension portion 115 corresponds to the shape of the first through hole 114. The extension portion 115 surrounds the first through hole 114 and is perpendicular to the sidewall 112 of the first through hole 114. The extension portion 115 includes a first extension plate 1151, a second extension plate 1152 opposite to the first extension plate 1151, and two third extension plates 1153 vertically connected between the first extension plate 1151 and the second extension plate 1152. The first extension plate 1151 and the second extension plate 1152 are both parallel to the bottom wall 111. The first extension plate 1151 is away from the bottom wall 111, and the second extension plate 1152 is adjacent to the bottom wall 111. The foam in the receiving groove 110 can pass through the first The through hole 114 and the extension portion 115 flow out.

The foaming groove 120 is disposed adjacent to the receiving groove 110. The foaming tank 120 is for accommodating the foam flowing from the accommodating tank 110, and causes the foam to be removed in the snubber 120 to convert the foam into a liquid. In this embodiment, the foaming groove 120 and the extending portion 115 communicate with each other, and the foam in the receiving groove 110 can flow directly into the foaming groove 120 through the first through hole 114 and the extending portion 115.

In this embodiment, the foaming groove 120 is substantially a rectangular parallelepiped body, and includes a bottom plate 121, a first side plate 122 and three second side plates 123. The first side plate 122 and the three second side plates 123 are perpendicularly connected to the bottom plate 121. In this embodiment, the first side plate 122 is adjacent to the receiving groove 110 and is connected to the second extending plate 1152 of the extending portion 115. The first side plate 122 has a stepped structure, and includes a first plate body 1221, a second plate body 1222, a third plate body 1223, a fourth plate body 1224, and a fifth plate body 1225 which are sequentially connected to each other. The first plate body 1221 and the second extension plate 1152 are connected to each other. The length of the first plate body 1221 should be greater than or equal to the length of the second extension plate 1152. The first plate body 1221 is substantially perpendicular to the second extension plate 1152. The second plate body 1222 is substantially perpendicular to the first plate body 1221, and the third plate body 1223 is vertically connected between the second plate body 1222 and the fourth plate body 1224. The distance between the second plate body 1222 and the second extension plate 1152, that is, the length of the first plate body 1221 in the vertical direction should be greater than 2 cm. The length of the third plate 1223 in the vertical direction should be greater than 8 cm. The first plate body 1221, the second plate body 1222, and the third plate body 1223 constitute a first step, and the third plate body 1223, the fourth plate body 1224, and the fifth plate body 1225 constitute a second step. Since the first side plate 122 is disposed to include at least one stepped structure, the flow of the foam through the first side plate 122 can increase the distance through which the foam flows, thereby increasing the probability of contact with the first side plate 122 during the foam flow, so that the foam is present here. There can be more foam breakage during the flow.

It can be understood that when the foam inflow rate is small, the first side panel 122 may also include only one step. In order to enable the foam to have a better crushing effect, the number of steps provided by the first side panel 122 may be increased or the height of the first side panel 122 may be increased.

The liquid storage tank 140 is for accommodating a liquid treated by the septic tank 120 or a mixture of a foam and a liquid. The foaming tank 120 and the liquid storage tank 140 are connected to each other by a first connecting pipe 130. Preferably, the first connecting pipe 130 is connected to one side of the foaming groove 120 near the bottom plate 121.

The liquid storage tank 140 is also substantially a rectangular parallelepiped tank body, and includes a top plate 141, four third side plates 142 and a second bottom plate 143. The second bottom plate 143 is connected to the four third side plates 142, and the top plate 141 is opposed to the second bottom plate 143. The first connecting pipe 130 communicates with the liquid storage tank 140 through a third side plate 142 of the liquid storage tank 140. One end of the first connecting pipe 130 communicating with the liquid storage tank 140 has a height difference from the second bottom plate 143, so that a mixture of foam and liquid or liquid can flow into the liquid storage tank 140 along the third side plate 142, so that The foam is in flow contact with the third side panel 142.

The second connecting pipe 150 is connected between the liquid storage tank 140 and the recovery pump 160 for flowing the liquid or liquid mixture in the liquid storage tank 140 to the recovery pump 160. In the present embodiment, the recovery pump 160 is a magnetic pump having corrosion resistance. The recovery pump 160 is used to withdraw the liquid or the mixture of foam and liquid in the reservoir 140 from the reservoir 140. Also, when the recovery pump 160 is used to extract the mixture of foam and liquid, the rapidly rotating impeller in the recovery pump 160 can break the foam and convert it into a liquid, so that all of the flow from the recovery pump 160 is liquid.

The third connecting pipe 170 is connected between the recovery pump 160 and the receiving tank 110, and is used for injecting the foam removing liquid flowing out of the recovery pump 160 into the receiving groove 110 for reuse.

The liquid level detecting device 180 is for detecting the liquid level in the liquid storage tank 140. In the present embodiment, the liquid level detecting device 180 is mounted on the top plate 141 and extends into the liquid storage tank 140 to detect the liquid level or the height of the foam in the liquid storage tank 140.

The controller 190 is connected to the liquid level detecting device 180 and the recovery pump 160 for controlling whether the recovery pump 160 is operated to change the liquid or liquid in the liquid storage tank 140 with the foam according to the signal detected by the liquid level detecting device 180. The mixture is withdrawn.

Referring to FIG. 3, the defoaming device 100 provided in this embodiment performs defoaming as follows. When the foam height in the receiving groove 110 reaches the height of the first through hole 114, the foam flows out through the first through hole 114 and the extending portion 115. When the foam flows through the second extension plate 1152 to the first side plate 122, the foam sequentially passes through the first plate body 1221, the second plate body 1222, the third plate body 1223, the fourth plate body 1224, and the fifth plate body 1225, that is, The two steps of the first side plate 122 are sequentially passed through, and during the flow, the foams rub against each other and rub against the first side plates 122, so that a part of the foam is broken into liquid. When the rate of foam flow is small, all of the foam breakage can be converted to a liquid by flowing along the first side panel 122. When the mixture of the foam and the liquid or the liquid flows into the liquid storage tank 140 through the first connecting pipe 130, the first connecting pipe 130 and the second bottom plate 143 of the liquid storage tank 140 have a height difference when the foam flows out from the first connecting pipe 130. The foam can flow along the third side panel 142 of the reservoir 140 so that the unbroken foam can be further broken. When the height of the foam of the liquid storage tank 140 or the liquid level of the liquid reaches a predetermined value, the liquid level detecting device 180 sends a signal to the controller 190, so that the controller 190 controls the recovery pump 160 to operate, and the liquid storage tank 140 is operated. The mixture of foam and liquid or liquid is withdrawn and supplied to the receiving tank 110 for reuse. In the process in which the recovery pump 160 draws out the mixture of the foam and the liquid, the impeller of the recovery pump 160 is rapidly rotated, so that the foam is broken and converted into a liquid, so that almost all of the supply of the recovery pump 160 to the storage tank 110 is liquid.

In the defoaming device 100 provided in this embodiment, the foam can cause most of the foam to be broken by flowing along the first side plate 122 having the step, and the foam is completely converted into a liquid by the impeller of the recovery pump 160. Thereby, the defoaming device 100 can cause most of the foam to break the foam by the flow, energy can be saved, and the liquid which can realize the foam conversion can be recycled.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Defoaming device

110‧‧‧ receiving trough

111‧‧‧ bottom wall

112‧‧‧ side wall

113‧‧‧ openings

114‧‧‧First through hole

115‧‧‧Extension

1151‧‧‧First extension board

1152‧‧‧Second extension board

1153‧‧‧ Third extension board

120‧‧‧ broken bubble tank

121‧‧‧floor

122‧‧‧First side panel

1221‧‧‧ first board

1222‧‧‧Second plate

1223‧‧‧ Third plate

1224‧‧‧4th plate

1225‧‧‧ fifth plate

123‧‧‧Second side panel

130‧‧‧First connecting pipe

140‧‧‧ liquid storage tank

141‧‧‧ top board

142‧‧‧ third side panel

143‧‧‧floor

150‧‧‧Second connection tube

160‧‧‧Recycling pump

170‧‧‧ Third connecting pipe

180‧‧‧Liquid height detecting device

190‧‧‧ Controller

FIG. 1 is a schematic perspective view of a defoaming device provided by an embodiment of the present technical solution.

Figure 2 is a cross-sectional view of Figure 1 taken along the ΙΙ-ΙΙ line.

FIG. 3 is a schematic diagram of a defoaming device provided by an embodiment of the present technical solution for defoaming.

100‧‧‧Defoaming device

110‧‧‧ receiving trough

115‧‧‧Extension

1151‧‧‧First extension board

1152‧‧‧Second extension board

1153‧‧‧ Third extension board

120‧‧‧ broken bubble tank

121‧‧‧floor

122‧‧‧First side panel

1221‧‧‧ first board

1222‧‧‧Second plate

1223‧‧‧ Third plate

1224‧‧‧4th plate

1225‧‧‧ fifth plate

123‧‧‧Second side panel

130‧‧‧First connecting pipe

140‧‧‧ liquid storage tank

141‧‧‧ top board

142‧‧‧ third side panel

150‧‧‧Second connection tube

160‧‧‧Recycling pump

170‧‧‧ Third connecting pipe

180‧‧‧Liquid height detecting device

190‧‧‧ Controller

Claims (7)

A defoaming device comprising:
a receiving groove for receiving a liquid with foam;
a snubber groove, the snubber groove is in communication with the accommodating groove, and is configured to receive a mixture or a liquid of a foam and a liquid flowing from the accommodating groove, the squeezing groove having a first side plate adjacent to the receiving groove, The first side plate has at least one stepped structure in a vertical direction, and a liquid with foam in the receiving groove flows into the blistering groove along the first side plate, and the at least one stepped structure is used to make the foam Breaking into a liquid during the process of flowing the first side plate into the snubber groove;
a liquid storage tank communicating with the foaming tank for containing a mixture or liquid of foam and liquid flowing from the foaming tank; and a recovery pump connected to the liquid storage tank and the storage tank Between the storage tanks, the mixture or liquid of the foam and the liquid in the liquid storage tank is transported to the receiving tank. The defoaming device of claim 1, wherein the defoaming device further comprises a liquid level detecting device and a controller, wherein the liquid level detecting device and the recovery pump are both coupled to the controller Electrically connected, the liquid level detecting device is configured to detect a liquid level in the liquid storage tank, and transmit the detected liquid level height to a controller, wherein the controller is configured to detect the liquid level detector according to the liquid level , control whether the recovery pump is activated. The defoaming device of claim 1, wherein the receiving groove comprises a side wall and an extending portion disposed in a horizontal direction, the side wall is provided with a first through hole, and the extending portion surrounds the The first through hole extends from the side wall away from the side wall, and the extending portion is connected to the first side plate of the blistering groove such that the receiving groove and the squeezing groove communicate with each other. The defoaming device of claim 3, wherein the first side plate comprises a first plate body, a second plate body and a third plate body connected to each other, the first plate body being vertically connected to the extension The second plate body is vertically connected between the first plate body and the third plate body, and the first plate body, the second plate body and the third plate body form a first step. The defoaming device of claim 4, wherein the first side panel further comprises a fourth plate body and a fifth plate body connected to each other, the fourth plate body being vertically connected to the third plate body and Between the fifth plates, the third plate, the fourth plate, and the fifth plate form a second step. The defoaming device of claim 1, wherein the recovery pump is a magnetic pump. The defoaming device of claim 6, wherein the recovery pump comprises an impeller for conveying a mixture or liquid of a foam and a liquid in the liquid storage tank to the receiving tank in a recovery pump The foam in the mixture of foam and liquid is broken.