JPH0326117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a board cleaning device installed in a production line for printed circuit boards and the like.

[Conventional technology]

If dust gets on the board during the printing process in the printed circuit board manufacturing line and dust adheres to the screen printing film, the dust will be printed all over the product, causing poor insulation between printed wiring. ,
Many defective products occur, resulting in poor yield.

Therefore, it becomes necessary to remove dust on the substrate. A simple conventional method, as shown in FIG. 4, involves pressing an adhesive roller 50 made of adhesive tape onto the substrate 10 to remove dust 52 on the substrate 10. In the figure, 51 is the substrate 10
, the arrow R is the direction of board movement, and the arrow U is the feed roller.
indicates the rotation direction of each roller. This method is effective at first, but when used repeatedly, it quickly loses its adhesion and conversely causes dust to adhere to the substrate, requiring frequent replacement of the rollers 50. , there were difficulties in maintenance.

Next, FIG. 5 is a side sectional view of another conventional device 60, and FIG. 6 is an explanatory end view of the device shown in FIG. is the exit direction, and FIG. 5 corresponds to the Y-Y direction arrow view showing the cleaning portion of the substrate in the upper half of FIG. 6.

In the figure, 61 is an outer plate casing, 62 is a brush for static elimination and peeling, 63, . Air is applied to neutralize the adhering dust by electrostatic force on the surface of the substrate, making it easy to peel off, and removing the dust with a static eliminating and peeling brush 62, and cleaning from a panker louver type blowing nozzle 68 as shown by arrow a. Air is blown out to suspend dust in the turbulent space, large dust is removed by a pre-filter 67 as shown by arrow a', and the air is circulated again via a HEPA filter 66 by a blower 65. The louver 68 shown in dotted lines in FIG. 5 indicates the louver on the opposite side.
In the example shown in the figure, the board movement space is divided by a partition panel 7.
Divide into 3 rooms A, B, C sequentially by 0,71,
The cleanliness of the space increases as you move toward the downstream side, and in each room, the ion generator 64 repeatedly applies ion wind to the substrate surface to remove dust and eliminate static electricity on the substrate surface. Clean surfaces. Reference numeral 68 indicates a drive unit for the rollers and brushes.

Such conventional devices have the following drawbacks.

(1) Although it is effective for cleaning dust that adheres to the substrate surface due to electrostatic force, it cannot clean sticky dust that contains moisture and oil.

(2) Because the space is a turbulent region, reattachment is likely to occur.

(3) The length of the conveyor in the direction of substrate movement becomes longer.
Requires large installation space.

[Means for solving problems]

In this invention, dust is blown away by a high-speed clean air stream blown out from a nozzle, and clean air is blown out at a slight speed around the nozzle to prevent contaminated outside air from entering. In this method, the dust that cannot be removed in the cleaning and drying process and the dust that has re-adhered are completely removed in a small space, and the dust is supplied to the printing process without re-adhering, thereby improving the quality and yield of substrate products.

〔Example〕

Figures 1, 2, and 3 are examples of this invention.
40, Figure 1 is an explanatory view seen from the side, Figure 2 is a Y-Y direction arrow view of Figure 1, and Figure 3 is an enlarged view of the upper half of Figure 2, cleaning and feeding the substrate. It is a diagram.

In the figure, 41 is a casing housing, 42 is a beam switch that detects the arrival of the board 10, 43 is a caster for moving the housing, 44 is a level adjuster, and 45 is an operation panel, a power distribution board, etc.
R indicates the direction of movement of the substrate. When the board 10 enters the casing 41, the beam switch 4
2 is detected, the variable speed motor 46 is activated, and drives the cleaning roller 11 and the neutralizing and feeding rollers 15, . . . in the direction shown by the arrow u. 16 indicates the axis of the roller 15. 12 is the shaft of the cleaning roller 11, 13 is a spongy rubbery part around the shaft, and 14 is a nonwoven fabric part on the outer periphery. The cleaning roller 11 rotates at a circumferential tangential speed approximately 1.5 times that of the feed roller 15, has a relative speed to the speed of the substrate, and scrapes the surface of the substrate to remove dust from the surface of the substrate. Axis 1 of this cleaning roller
2 is surrounded by a foamed sponge-like elastic rubber material as described above, and the outer periphery is made of non-woven fabric, so it rubs the substrate softly and does not scratch the substrate.

This cleaning roll 1 in the advancing direction of the substrate 10
A high-speed blowout nozzle 1 is installed in front of the nozzle 1 tilted backward at about 45 degrees, and a high-speed airflow of about 80 m/sec is blown onto the surface of the substrate, blowing away dust on the substrate and escaping to the rear. (The embodiments shown in FIGS. 1 to 3 show examples of devices that clean only one side of the substrate.) This high-speed airflow is carried out by a turbo blower 30.
From there, it passes through the duct 31 and enters the upper plenum chamber 5 as shown by arrow _a1 , and then enters the prefilter 4,
Plenum duct 2 through HEPA filter 3
and is blown out from nozzle 1. 30' indicates a drive motor for the turbo block 30.

Next, in order to prevent contaminated outside air from entering, the air from the Sirotskov fan 32 passes through a duct 33, enters the upper plenum chamber 5' as shown by arrow _a2 , and passes through a prefilter 4' and a HEPA filter 3'. enters the intake ducts 21 and 23;
Clean air is blown out from the perforated plates 22 and 24 at a slight wind speed of about 0.5 m/sec. 32' is a drive motor for the Sirotskov fan, and 6 is a partition between the plenum chambers 5, 5'.

A part of the air blown out at high speed and low wind speed is sucked into the suction duct 25 or 28. As shown by the arrow f, the air sucked into the suction duct 25 from the suction port 26 is passed through the left and right duct hoses 34 and 35, and the air sucked into the suction duct 28 from the suction hole 29 is passed through the duct hoses 36 and 37. Then,
They are each guided to a gathering chamber 38 and return to the Sirotskov fan 32. The remainder of the air flows from the perforated plate 27 into the lower casing 41 and to the turbo blower 30 as shown by arrow f. The casing 41 is provided with a perforated plate portion 47 that communicates with the outside air, and the outside air is taken in for cooling as well. (Since the substrates are sent at regular intervals, if there is no substrate under the nozzle, the high-speed air is directly sucked into the suction duct 28 at the bottom.) The cleaning roller 11 is solid and covers the entire width of the conveyor. However, the static neutralization and feed rollers 15,... are made of elastic rubber with a width of about 9 mm, and are approximately 9 mm wide in the axial direction.
Installed with a pitch of 70mm. Since it is conductive with an electrical resistance of about 5 to 10KΩ, it can sufficiently ground static electricity on the board. This roller can also be cleaned with high-speed airflow. Furthermore, since they are all conductive, there are many opportunities for static electricity to be eliminated, which is convenient for dissipating static electricity. The static eliminating roller, feed roller, and cleaning roller have sufficient elasticity, so
Even if the thickness of the board changes, it can sufficiently cover changes of about 0.5 to 2 mm, and since the rollers are arranged at a pitch of 70 mm, it can cover even if the size of the board changes from 150 mm square to about 610 mm square.

If the board is not sent at a certain interval (for example, every 6 seconds), or if the board is not sent due to a failure in another line for about 5 minutes, for example, by incorporating an off-delay timer, it is possible to Automatic operation is also possible by suspending automatic operation if no data is sent for more than a second. Since the cleaning roller becomes dirty when used for a long time, it is of course possible to replace it with one touch.

FIG. 7 shows a conceptual explanatory diagram of a path 80 in which the present invention is applied to cleaning both sides of the substrate 10. 81 is a casing, 90 is a beam switch, 11 is a cleaning roll, 15 is a feed roll, R is the movement direction of the substrate, and U is the rotation direction of the roll. High-speed air is blown out from plenum ducts 84, 84 through high-speed blowout nozzles 85, 85. The light air is blown out from the air supply ducts 82 and 86 through the perforated plates 83 and 87, and the air is sucked into the suction duct 88 through the holes 89. In this way, it may be configured vertically symmetrically.

〔effect〕

(1) Can completely clean even moist and sticky dust.

(2) Removed dust will not re-adhere to the board.

(3) The length of the conveyor can be shortened (approximately 1/2 of the conventional one), saving space.

(4) The maintenance period for rollers will be significantly extended.

[Brief explanation of drawings]

Fig. 1 is a side explanatory view of an embodiment of this invention;
3 is a partially enlarged view of FIG. 2, FIG. 4 is an explanatory diagram of a conventional example, FIG. 5 is an explanatory diagram of another conventional example, 6 is a view taken in the X direction of FIG. 5, and FIG. 7 is a conceptual explanatory diagram of a second embodiment of the present invention. Explanation of symbols, 1...High speed blowing nozzle, 2...
...Plenum duct, 3...HEPA filter,
4... Prefilter, 5... Plenum chamber, 6... Partition, 11... Cleaning roller, 12...
...Shaft, 13...Rubber part, 14...Nonwoven fabric, 15
...roller, 16...shaft, 21...air supply duct,
22... Perforated plate, 23... Air supply duct, 24...
Perforated plate, 25... Suction duct, 26... Suction hole,
27... Perforated plate, 28... Suction duct, 29...
Hole, 30...turbo blower, 30'...motor,
31...Duct, 32...Shirotskovan, 3
2'... Motor, 33... Duct, 34, 35,
36, 37... Duct hose, 38... Collective chamber, 41... Casing housing, 42... Beam switch, 43... Caster, 44... Level adjuster, 45... Switchboard, operation panel, 46
...Motor, 47...Outside air intake perforated plate, 50...
Adhesive roller, 50...Feed roller, 61...
Casing, 62...Brush, 63...Feed roller, 64...Ion generator, 65...Blower,
66...HEPA filter, 67...Prefilter, 68...Blowout nozzle, 69...Roller drive device, 70, 71...Partition panel, 81...Casing, 82...Air supply duct, 83...Perforated plate , 84...Plenum duct, 85...High speed blowing nozzle, 86...Air supply duct, 87...Perforated plate, 88...Intake duct, 89...Suction hole, 90
...beam switch.

Claims (1)

[Claims] 1. A board cleaning device installed in a manufacturing line for printed circuit boards, etc., includes a high-speed air blowing nozzle that communicates with a high-speed air blower through a high-performance filter and has a blowing angle diagonally backward with respect to the board movement direction, and a high-speed air blowing section. A perforated plate for blowing out low-speed air that communicates with the blower for low-speed air via a high-performance filter, and a suction duct and duct that return a part of the blown air to the blower for low-speed air. A substrate cleaning device comprising a hose and a suction perforated plate for returning remaining air to the high-speed air blower.