JPS6249984A - Substrate cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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]

When there is dust on one board during the printing process in a printed circuit board manufacturing line, and the dust adheres to the screen printing film,
Dust was printed all over the product, causing poor insulation between the 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, is to remove the excess dust 52 on the substrate 10 by pressing an adhesive roller 50 made of adhesive tape into a roller shape onto the substrate 10. There is.

Figure 1: Feed rollers for the 51U substrate 10, arrow R indicates the direction of movement of the substrate, and arrow U indicates the direction of rotation of each roller.

This method is effective at first, but if it is used repeatedly, it will quickly lose its adhesion and will cause dust to adhere to the substrate, requiring frequent replacement of the roller 50. However, 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.

D is in 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, 66, . Ion air is applied to neutralize the adhering dust using electrostatic force on the surface of the substrate, making it easy to peel off, and removing the dust using the static eliminating and peeling Shirashiro 2. Clean air is blown out as shown by t% to suspend dust in the turbulent space, and the air is passed through a pre-filter 671 to remove large dust as shown by the arrow a'f, and is circulated again via the HEPA filter 66 by the blower 65. Figure 5! Lou S68 indicated by dotted line
shows the roots on the opposite side. In the example shown in the figure, the movement space of the board is divided into A by partition panels 70 and 71.
, B, and C, and the cleanliness of the space increases toward the downstream side.In each room, an ion generator 64 repeatedly applies ion wind to the substrate surface to remove dust and remove static electricity from the substrate surface. Remove static electricity and clean the board surface. Reference numeral 68 indicates a drive unit for the rollers and brushes.

Such conventional devices often suffer from the following drawbacks.

(1) Although it is effective for cleaning dust that has adhered to the surface of the board due to electrostatic force, it cannot clean highly sticky dust that contains moisture and oil.

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

(The length of the conveyor machine in the direction of movement of the 31 board becomes longer.

Requires large installation space.

(4) Since the device becomes larger, the price becomes higher.

[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 process, the dust that did not pass through the cleaning and drying process F and the re-adhered dust are completely removed in a small space and then supplied to the printing process without being re-adhered, thereby improving the quality and yield of substrate products.

〔Example〕

1, 2, and 6 show an embodiment 40 of the present invention, FIG. 1 is an explanatory view seen from the side, and FIG.
-Y direction arrow view, FIG. 6 is an enlarged view of the cleaning and feeding portion of the substrate in the upper half of FIG.

In the figure, 41 is a casing, and 42 is a beam switch that detects when the board 10 enters.

46 indicates casters for moving the 11th body, 44 indicates a level adjuster, 45f'i operation panel, switchboard, etc. R indicates the direction of movement of the substrate. When the substrate 10 enters the casing 41, the beam switch 42 detects it, the variable speed motor 46 is activated, and the cleaning roller 11 and the neutralizing and feeding roller 15. ... is driven in the direction indicated by the arrow ui'. 1
6 indicates the axis of the roller 15. 12 is the shaft of the cleaning roller 11, 16 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. The shaft 12 of this cleaning roller is surrounded by foamed sponge-like elastic rubber as mentioned above.
The outer periphery is covered with non-woven fabric, so it rubs the board softly and does not scratch the board.

A high-speed blowing nozzle 1 is installed in front of this cleaning roll 11 in the direction of movement of the substrate 10, tilting backward at about 45 degrees, and a high-speed airflow of about 3QTrL/Sec is blown onto the surface of the substrate to blow away dust on the substrate. and run backwards.

(Embodiment f shown in FIGS. 1 to 3 is an example of an apparatus that cleans only one side of the substrate.) This high-speed airflow flows upward from the tarze blower 60 through the duct 31 as shown by the arrow a1. enters the plenum chamber 5 and passes through the pre-filter 4 and HEPA filter 3 to the plenum duct 2.
To enter the.

It is blown out from nozzle 1. 60′ is tar 2! Lock 6
0 drive motor is shown.

Next, in order to prevent contaminated outside air from entering, the sirocco fan 32
The low wind speed air from the duct) 55'1 enters the upper plenum chamber 5' as shown by the arrow a2↑, enters the intake ducts 21 and 26 via the pre-filter 4'-I (EPA filter 6', Clean air at a slight wind speed of about 0.51 rL/sec is blown out from the perforated plates 22 and 24. 32' is the drive motor for the hashirotsuko fan, and 6 is a partition between the plenum channel holes 5 and 5'.

A part of the air blown out at these high speeds and low wind speeds is sucked into the suction duct 25 or 28. As shown by the arrow f't%, the air sucked into the suction duct 25 from the suction port 26 is passed through the left and right duct hoses 34, 35 and into the suction duct 2.
The air sucked from the suction hole 29 into the duct hose 36
．． By 67.

Guided by Chan A-38, Sirocco fans 62
Return to The remainder of the air flows from the M-hole plate 27 into the lower casing 41 and into the air filter 30 as shown by arrow f. The casing 41 has a perforated plate portion 47 that communicates with the outside air.
is installed to bring in outside air for cooling purposes. (Note that the substrate is sent at regular intervals f1. When there is no substrate just below the nozzle, the high-speed air is sent directly to the suction duct 28 at the bottom.
be sucked into. ) The cleaning roller 11 is solid and covers the entire width of the conveyor, but the cleaning roller 11 is solid and covers the entire width of the conveyor. ...is about 9mm wide! It is made of elastic rubber and has a pitch of about 70 mm in the axial direction. Since it has a conductivity of about 5 to 10KQ of electrical resistance, it can sufficiently remove static electricity on the board.High-speed airflow can also clean this roller.
It is convenient to dissipate static electricity because there are many opportunities to eliminate static electricity. The static eliminating and feeding 90-ra and cleaning rollers should be sufficiently elastic.

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 lined up at a pitch of 70 mm, the force will be reduced even if the size of the board changes from 150 myns square to 610 square feet.・ζ−〒kiru.

If the board is not sent at a certain interval (for example, every 6 seconds) 1 If a board is not sent due to a failure in another line for example 5 minutes, by incorporating an off-delay timer 1 For example 10 seconds Automatic operation is also possible by suspending automatic operation if no more information is sent.

The cleaning roller gets dirty when used for a long time, so it is of course better to be able 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, and R is the moving direction of the substrate.

U is the direction of rotation of the roll. The high-speed air is blown out from the plenum duct) 84.84 and from the high-speed blowout nozzle 85°85. Light velocity air is blown out from the supply air ducts 82, 86 through the perforated plates 83, 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) Completely cleans even moist and highly adhesive dust.

(2) Peeled dust does not adhere to the substrate again.

(3) The length of the conveyor is short (about 1 t) compared to the conventional one.
) Saves space.

(4) The maintenance period for the rollers is significantly extended.

[Brief explanation of the drawing]

FIG. 1 is a side explanatory view of an embodiment of the invention, and FIG.
Y-Y arrow view in the figure, Figure 3 is a partially enlarged view of Figure 2, Figure 4
Figure 5 is an explanatory diagram of a conventional example, Figure 5 is an explanatory diagram of another conventional example, Figure 6 is a view taken in the X direction of Figure 5, and Figure 7 is a conceptual explanation of a second embodiment of the present invention. There is Figure 1. Explanation of symbols 1...High speed blowing nozzle, 2...Plenum duct. 6...HEPA filter, 4...Prefilter-15...Plenum channels-16...Partition. 11...Cleaning roller, 12...Shaft, 13.
...Rubber part, 14...Nonwoven fabric, 15...Roller, 16...Shaft. 21...Air supply duct, 22...Perforated plate, 26...
・Air supply duct, 24... perforated plate. 25... Suction duct, 26... Suction hole. 27... Perforated plate, 28... Suction duct, 29
...hole. 60...Tar 2 Zorova, 30'...Motor. 31...Duct, 32...Sirocco fan. 62'...Motor, 63...Duct. 34.35, 36.37... Duct hose. 38...Collection channels-141...Casing housing, 42...Beam switch, 46...Casters. 44...Level adjuster. 45...Switching board, operation panel, 46...Motor. 47...Shoulder hole plate for outside air intake, 50...Roller with adhesive, 50...Feed roller, 61...Casing, 62...Brush, 66...Feed roller. 64...Ion generator, 65...Blower. 66... HEPA filter, 67... Pre-filter, 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. Figure 4 Figure 1i1 Figure 2

Claims (1)

[Claims] In a board cleaning device installed in a production line for printed circuit boards, etc., high-speed clean air is blown out from a high-speed air blowing nozzle that has a rearward blowing angle diagonally with respect to the board movement direction, and the above-mentioned high-speed clean air is blown out from a perforated plate around the nozzle. Clean air is blown out at a slightly slower speed than air, and both of these airs are circulated again to the blowers for high-speed air and low-speed air, and conductive rubber rollers are used to feed the board and eliminate static electricity. A board cleaning device characterized in that it performs the following.