JPH038475A - Method for applying liquid material - Google Patents

Abstract

PURPOSE:To allow dealing with the trend toward higher densities by pulverizing a liquid material in chambers, then applying the particles on the coating surface of a material to be coated. CONSTITUTION:Transporting rollers 13 and crimping rollers 14 in respective sections are actuated by means of driving sections 50 and 55 and guide frames 20, 21, 22 for movement are positioned in accordance with the transverse width of a substrate while the frames are actuated by means of driving motors 51, 58. Further, the opening width of apertures 32 of the chambers 30, 46 are set in accordance with the transverse width of the substrate by sliding a shielding plate 44. An injection section 40 is actuated to inject a liquid resist in accordance with the arrival of the applying surface of the substrate at the aperture 32 of the chamber 30 of the 1st application section 20. After the is resist is pulverized via the chamber 30, the liquid resist particles are applied on the applying surface. The application is surely executed in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is a method of applying a liquid substance, which is applied to a method of applying a resist film to the entire surface of a printed wiring board.

[Conventional technology]

Conventionally, when applying an insulating resist film to the entire surface of a printed wiring board, it is applied by a printing method, a spray method, or the like.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned printing method, as the density of printed wiring boards has increased in recent years, it has become difficult to apply a resist film between microcircuit patterns, and problems arise due to poor insulation. The increase in defective products has become a problem.

In addition, depending on the composition of the liquid substance, the spray method can have a high viscosity and is difficult to apply, so it can be adopted as a coating method that corresponds to the high density of the printed wiring board.
In addition, the spray system requires a large space for the painting equipment because it requires exhaust equipment.

Therefore, the present invention was developed in view of the problems of the conventional coating method, and has coating performance that can cope with the increasing density of printed wiring boards, and can reduce the size of equipment and improve the working environment. The purpose of this invention is to provide a method for applying a liquid substance.

[Means and effects for solving the problems] The method of the present invention is a method of applying a liquid substance while moving an object to be coated, in which the liquid substance is pulverized in a chamber, and then the object to be coated is A method for applying a liquid substance, which is characterized in that the liquid substance is applied to the surface to be coated, and the liquid substance is applied to the surface to be coated and the surface to be coated while pulverizing the liquid material. It exhibits a coating effect and enables coating that is not affected by the viscosity of the liquid substance.

〔Example〕

Examples of the coating method of the present invention will be described below along with a coating device that is directly used to carry out the method.

The drawings show a coating apparatus directly used in carrying out the present invention, in which Figure 1 is a side view showing the general configuration of the coating apparatus, Figure 2 is a plan view of the same, and Figure 3 shows the first and second coatings in the coating apparatus. FIG. 3A is a plan view of the chamber, FIG. 3A is a longitudinal sectional front view, and FIG. 3C is a side view.

1 and 2, reference numeral 1 denotes a loading section for a printed wiring board as an object to be coated or a substrate (hereinafter simply referred to as a substrate) as a material to be processed; It is located on the right side.

Further, a first coating section 2 is arranged adjacent to the carrying-in section 1, and the first coating section 2 is arranged adjacent to the carrying-out section 5 arranged on the other side of the coating device, that is, on the left side in the figure. A coating device is constructed by disposing an inverted portion 3 of a substrate as an object to be coated between the second coating portions 4 arranged in the same manner.

Thus, the first and second applicator sections 2 and 4 are installed on the upper side of the base 6, and the loading section 1, the reversing section 3, and the unloading section 5 are installed on the mounts 7 and 8 installed on the upper side of the base 6. and 9, respectively.

Further, between the carrying-in section 1 and the carrying-out section 5, a conveying roller 13 and a nipping roller 14 are rotatably installed along a substrate conveying line that is in line with the substrate conveying lines of other parts. .

Furthermore, fixed guide frames 10 and 12 are provided upright on one side of the loading section 1 and the unloading section 5 on one side of the substrate transport line.
and 12, there are provided moving guide frames 20 and 22 that are slidable in opposite directions, and correspondingly, the reversing frame 11 is rotatably installed in the reversing section 3. One side frame 21 is configured as a fixed guide frame, and the other side frame 21 is configured as a slidably movable guide frame.

Next, the first one! ! The configurations of the cloth section 2 and the second application section 4 will be explained. However, since the configurations of the first applicator 2 and the second applicator 4 are the same, the configuration of one of the first applicators 2 will be explained, and each part of the second applicator 4 will be explained below. numbers in parentheses and omit their explanations.

(Brackets are omitted for parts with the same number in the figure.)

Therefore, the first applicator 2 is provided with a chamber 30 on the upper side of the base 6.
(46) and this chamber 30 (46).
) is provided with a liquid substance spouting part 40, and the chamber 3
0 (46) is constructed by constructing an exhaust duct 41 above it.

Therefore, the configuration of the chamber 30 (46) is
As shown in Figures a, b, and c, an opening 32 is provided on the upper side of the chamber main body 34 to serve as a part for applying liquid particles to the coating surface of the substrate, and an opening 32 is provided on the lower side of the chamber body 34 to serve as a part for applying liquid particles to the application surface of the substrate. An intake port 39 is provided, and air intake ports 37 and 38 are opened in left and right side plates 35 and 36, respectively.

Further, the opening 32 is provided with a shielding plate 33 slidable from the left and right ends toward the center.
The opening area of the left and right side plates 35 and 3 increases toward the center.
6 is formed small by narrowing the opposing interval in a tapered shape.

The chamber 30 (4'6) shown in FIG. 3 is shown with shielding plates 33 provided on both left and right sides and configured to be slidable in opposite directions, but in FIGS. 1 and 2, A fixed shielding plate is installed on one side,
A configuration is shown in which a shielding plate 44 that interlocks with the moving guide frame is provided on the other side.

Furthermore, along the left and right sides of the chamber 30 (46),
Exhaust ducts 42 and 43 are attached, and a filter 45 made of nonwoven fabric or the like is stretched between the exhaust duct 41 and the opening 32 of the chamber 30 (46) so as to be slidable in the length direction of the opening 32. .

This filter 45 has a winding part (not shown) of the filter 45 at one end on the fixed guide side of the conveyance line, and a supply part (not shown) on the moving guide side, so that the amount of coating at the opening 32 Corresponding to filter 4
5 is moved from the supply section to the take-up section side so as not to reduce the filtering action of the filter 45.

Regarding the movement of the filter 45, the length portion corresponding to the length of the opening 32 may be moved at intervals, or the filter 45 may be moved continuously at a predetermined speed, for example, a speed corresponding to the moving speed of the substrate. It is desirable to be able to move the filter and maintain the required filtering effect at all times.

In the chamber 30 (46) configured as described above, a liquid substance, for example, a liquid resist having a desired composition to be applied to a substrate, is injected from the ejection part 40 together with high pressure gas, and the liquid is ejected from the inlet 39 into the chamber 30 (46).
), and while taking in air from the air intake ports 37 and 3 of the left and right side plates 35 and 36 in connection with the insertion of the brackets, the ejected liquid resist is turned into particles in the chamber 30 (46). The structure is such that the particulate liquid resist can be applied to the coating surface of the object through the opening 32.

Further, the jetting of the liquid resist using the high pressure gas in the jetting section 40 promotes particle formation by jetting the high pressure gas in a pulsed manner and controlling the jetting of the liquid resist.

The chamber 30 (46) is connected and supported by the support arm 60 of the drive unit 58, and is configured so that the chamber 30 (46) can be moved in a direction perpendicular to the conveyance line by driving the drive unit 58. It is configured such that the installation position with respect to the conveyance line can be adjusted.

Next, the configuration of the reversing section 3 will be explained. The reversing frame 11 is supported by a rotating shaft rotatably spanned between the driving section 58 and the bearings of the rotary actuator 59 as the reversing driving section. At the same time, a pair of upper and lower substrate holding rollers 14, which function as the above-mentioned substrate conveyance rollers, are arranged in a row between the reversing frame 11.
Furthermore, a connecting clutch 57 with a driving clutch 56 is connected to the rotating shaft of the pinching roller 14 located at the front and rear ends in the conveying direction.
A drive motor 55 for a rotary drive shaft, which is fixed to the driving clutch 56, is provided on the upper side of the pedestal 8, and a drive motor 55 for a rotational drive shaft is provided on the upper side of the pedestal 8 in a direction opposite to the fixed guide frame of the reversing frame 11. It is constructed by providing a drive section for a moving guide frame 21 that is slidably attached.

Thus, the reversing frame 11 is reversed by the operation of the rotary actuator 59, and in connection with the reversing operation, the clutch 56 for driving one of the nipping rollers 14 is separated from the clutch 57 for connecting the nipping rollers, and the reversing frame 11 is reversed. rear,
The connecting clutch 57 of the other nipping roller 14 is connected to the driving clutch 56, and each nipping roller 14 is configured to be rotated by the drive of the drive motor 55.

In addition, the moving guide frame 21 is driven by the drive unit on the 5th day.
The reversing frame 11 is configured so that its width can be adjusted relative to the width of the substrate while being slid using the rotating shaft of the holding roller 14 at the front and rear ends of the reversing frame 11 as a guide axis. .

Furthermore, the moving guide frames 20 and 22 in the carrying-in section 1 and the carrying-out section 5 are fixedly guided along the guide shafts by driving a drive motor 51 provided above the frames 7 and 9. Frames 10 and 12
It is configured such that the position between the fixed guide frames IO and 12 corresponding to the width of the substrate can be adjusted while sliding in the direction opposite to the fixed guide frames IO and 12.

Further, each conveyance roller 13 is configured to be driven by a drive motor 50 provided above the frames 7 and 9.

Next, a method of applying a liquid resist to a substrate using the coating apparatus having the above configuration will be described below.

First, the transport roller 13 and the clamping roller 14 in each part are operated via the respective drive parts 50 and 55, and the moving guide frame 20.2 is adjusted to correspond to the width of the substrate.
1 and 22 are actuated and positioned via drive motors 51 and 58, and chambers 30 and 46 are
The opening width of the opening 32 is set by sliding the shielding plate 44 to correspond to the width of the substrate.

After the above-mentioned respective parts are set as required, the substrate is carried in from the carrying-in section 1 via the conveying roller 13, and when the coating surface of the substrate reaches the opening 32 of the chamber 30 of the first coating section 20, the spouting section is installed. 40 is actuated to spray the liquid resist, and after turning it into particles through the chamber 30, the particles of the liquid resist are applied to the coating surface of the substrate facing the opening 32.

Thus, the coating operation is carried out while spraying liquid resist particles onto the coating surface of the moving substrate using the coating ability of the first coating section 2 that corresponds to the moving speed of the transport roller 13.

Further, during the coating operation on the substrate in the first coating section 2, initially, there is no substrate in the second coating section 4, and therefore, the second coating section 4 stops operating.

During the coating operation in the first coating section 2, the spouting section 4
Exhaust ducts 41, 42 and 43 operate in conjunction with the operation of 0, exhausting the liquid resist particles sprayed outside the opening 32 and preventing them from scattering to the outside by the filter 45. be.

Now, the coating work in the first coating section 2 is carried out by the conveying roller 1.
3, the substrates transported in step 3 are sequentially coated, and the substrates whose coating surfaces have been coated in the first coating section 2 are carried between the clamping rollers 14 in the reversing frame 11, and are coated on the substrates in the previous order. When the tip reaches between the pinching rollers 14 on the rear end side of the reversing frame 11, the -1 carry-in section 1, the first application section 2, and the rotation of the pinching rollers 14 of the reversing frame 11 are stopped. do.

After that, the clutch 56 of the drive motor 55 of the pinching roller 14 is connected to the coupling clutch 5 of the rotating shaft of the pinching roller 14.
7, the rotary actuator 59 is operated to reverse the reversing frame 11.

By this reversing operation of the reversing frame 11, the -
Side first! 4! The other surface of the substrate on which the liquid resist has been applied is turned downward by the cloth portion 2 .

Therefore, in connection with the completion of the reversing operation of the reversing frame 11, the above-mentioned operations in the loading section 1 and the first application section 2 are restarted, and the reversing frame 11 is inverted and held. After the reversing frame 11 is reversed, the substrate is carried into the second coating section 4 via the respective clamping rollers 14, which are rotated by the clutch 56 of the drive motor 55 being connected to the coupling clutch 57 of the clamping roller 14. .

The second coating section 4 is operated in conjunction with the loading of the end of the substrate, and performs the same coating work as the first coating section 2, and also completes the coating on the other side in the second coating section 4. ,
The substrate, on which both sides have been coated with the required resist film, is carried out via the carry-out section 5.

Thereafter, the same operations as described above are performed to successively apply the resist film to both surfaces of the substrate.

Note that the timing of the operations in each of the sections can be automatically performed by controlling the electrical and mechanical control sections required for the operations.

In the figure, reference numeral 52 indicates a cylinder for compensating for the backlash of the conveyor rollers 13 caused by the movement of the moving guide frames 20 and 22.

As is clear from the above explanation, in order to apply the liquid resist to the coating surface of the substrate while pulverizing it in the chamber, it is necessary to apply a resist film appropriately in accordance with the high density of the circuit pattern on the coating surface of the substrate. This makes it possible to prevent the occurrence of defective products due to poor insulation.

In addition, coating onto the coating surface of the substrate is performed through the opening of the chamber, and by adjusting the opening area of the opening according to the coating surface of the substrate using a shielding plate, overspray can be almost eliminated. At the same time, the liquid resist as surplus particulate material can be collected into the chamber, thereby improving the coating efficiency and the economical efficiency of the liquid resist.

Furthermore, the opening area of the exhaust duct can be reduced by the interposition of the exhaust duct and the filter.

For example, in the case of a 500 square board, the opening area of the exhaust duct can be 600 m x 100 m.

In addition, in the case of an exhaust wind speed of 0.5 m/see, in the case of a general spray method, I
cX60=30I/Ill nIn case of electrostatic bell type, 2X2X0.3m/sec X60=72nT/si
n, whereas in the case of the present invention, 0.6 m
O, 1m XO, 3m/see X 60 = 1.
08 rrf/sin, and the degree of energy saving is clear, and in the case of the conventional method, there is the trouble of having to clean the booth, but the present invention eliminates the need for such work. Furthermore, although the amount of make-up air consumed in conventional air-conditioned rooms is a problem, implementing the method of the present invention has the advantage that this can be reduced to 1/30 to 1/70.

Additionally, depending on the composition of the liquid resist, if coating a highly viscous liquid substance is required, it is possible to achieve this by slowing down the coating speed, something that was not possible with conventional coating methods. It is possible to apply a viscous liquid substance.

Further, the thickness of the resist film relative to the coated surface of the substrate can be controlled in any way by varying the pulse width at the ejection section in the coating section.

〔Effect of the invention〕

According to the method of the present invention, it is possible to apply a coating film that corresponds to the high density of the surface to be coated, and the space required for the coating operation as a whole can be reduced due to the miniaturization of exhaust equipment. , and can improve application accuracy and efficiency.

[Brief explanation of drawings]

The drawings show a coating apparatus directly used in carrying out the present invention, in which Figure 1 is a side view showing the general configuration of the coating apparatus, Figure 2 is a plan view of the same, and Figure 3 shows the first and second coatings in the coating apparatus. FIG. 3A is a plan view of the chamber, FIG. 3A is a longitudinal sectional front view, and FIG. 3C is a side view. ■ Loading section 2... First coating section 3... Reversing section 4... Second coating section 5... Carrying out section 6... Base 7.8.9... Frame 10 , 12...Guide frame 11...Reversing frame 13...Conveyance roller 14...Pinch roller 20.21.22...Movement guide frame 30.46...
・Chamber 32... Opening 33... Shielding plate 4... Chamber body 5.36... Left and right side plates 9... Receiving port 0 for ejected liquid material... Spouting part l... Exhaust duct 2.43... Exhaust duct 4... Shielding plate 5... Filter 0... Drive motor... Drive motor 2... Cylinder 5... Drive motor 6... Clutch 7... Connection clutch 8... Drive unit 9... Reversing drive unit O... Support arm

Claims (10)

[Claims] (1) A method of applying a liquid substance while moving an object to be coated, wherein the liquid substance is pulverized in a chamber and then applied to the application surface of the object to be coated. How to apply. (2) The method of applying a liquid substance according to claim 1, wherein the method of turning the liquid substance into particles is a spray method, and the liquid substance is formed into particles by spraying in a pulsed manner. (3) An exhaust duct for the particulate material is provided above the chamber opening, and the excess particulate material applied through the chamber opening is exhausted while being applied. How to apply the substance. (4) The method of applying a liquid substance according to claim 1 or 3, wherein the excess particulate substance is applied while being exhausted through a filter such as a non-woven fabric stretched in front of an exhaust duct. (5) The liquid substance in the chamber is turned into particles,
2. The method for applying a liquid substance according to claim 1, wherein the liquid substance is pulverized while being sucked in through an air intake port provided in the chamber. (6) The liquid substance according to claim 1, wherein the opening area of the chamber is adjusted in accordance with the width in a direction perpendicular to the moving direction of the coating surface of the object to be coated. How to apply. (7) The liquid substance according to claim 1, wherein the opening area of the chamber is reduced from the left and right side edges of the coating surface of the object to be coated in the moving direction toward the center. Application method. (8) The method for applying a liquid substance according to claim 1, wherein the object to be coated is a printed wiring board or a substrate for a printed wiring board. (9) The liquid substance coating method according to claim 1, wherein the liquid substance is a liquid resist or other liquid coating substance for printed wiring boards. (10) Coating one side of the object to be coated in the first coating section provided with the chamber, and reversing the coated section after coating one side by the first coating section, and applying the coating to the second coating section including the chamber. 2. The method of applying a liquid substance according to claim 1, further comprising applying the liquid substance to the other surface of the object.