JP3398822B2 - Paste lamination method and apparatus by screen printing - Google Patents

Abstract

PURPOSE:To provide a method of drying paste at the time of printing and laminating the paste, to make a plurality of times of printings of the paste possible using screen printers in one cycle and to realize a shortning of the lead time for the lamination of the paste. CONSTITUTION:A method of laminating paste is a method, which provides temporary drying machines 11, 12 and 13 for paste surface drying between a plurality of screen printers 1, 2, 3 and 4 for screen-printing the paste on pellet substrates 10 and makes the machines 11 12 and 13 pass through the substrates 10 to screen-print the following paste on the substrates 10 with the paste brought into a state that the surface of the paste is dried, and prevents the paste from offsetting on the screens of the machines 11, 12 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multilayer electronic components (multilayer chip components) such as multilayer chip inductors and multilayer transformers.
The present invention relates to a method and a device for laminating a paste by screen printing for manufacturing.

[0002]

2. Description of the Related Art Multilayer electronic components (multilayer chip components) such as multi-layer chip inductors and multi-layer transformers are formed on a pallet substrate by a pattern of conductor paste, a pattern of magnetic paste, and a non-magnetic substance corresponding to many components. It is manufactured by repeatedly printing a paste pattern or the like by screen printing and stacking to form a laminate, and cutting and separating the laminate into individual parts.

FIG. 4 shows a schematic view of a conventional typical screen-printing paste laminating apparatus for producing the above-mentioned laminated body. In the figure, the laminating apparatus comprises one main drying zone 47, one cooling zone 48 and four screen printing machines 1, 2, 3, 4 as well as a leveling zone 5, a pallet substrate conveying descending elevator 6 and It consists of a lift elevator 9. The arrow indicates the transport direction of the pallet substrate 10 that is the printing target. Further, screens of different printing patterns are set in the screen printing machines 1 to 4.

Here, a method of laminating by the paste laminating apparatus by the screen printing will be described below. First, one of the printing machines 1 to 4 prints a pattern using a conductor paste, a magnetic paste, or a non-magnetic paste on the upper surface of the pallet substrate 10. The pallet substrate 10 on which the paste has been printed has surface irregularities flattened by the surface tension of the paste itself while passing through the leveling zone 5 for a predetermined time, and then passes through the descending elevator 6 to move to the main drying zone 47. It is transported inside. A far infrared heater is provided inside the main drying zone 47, and the paste on the upper surface of the pallet substrate 10 is dried when the pallet substrate 10 passes through. The pallet substrate 10 is cooled through the cooling zone 48 and returns from the ascending elevator 9 to the screen printing machines 1 to 4 again. Then again, either 1
The paste is printed by one of the printing machines 1 to 4 and passed through the leveling zone 5, the main drying zone 47, and the cooling zone 48. Such steps from printing to drying and cooling are repeated until the paste laminate reaches a specified thickness.

[0005]

By the way, in the above-mentioned conventional paste laminating apparatus by screen printing, the printing of the paste by a certain screen printing machine 1 to 4, the drying of the paste in the main drying zone 47, and the pallet in the cooling zone 48. One cycle consists of a series of steps for cooling the substrate 10, and when one of the four screen printing machines 1 to 4 is operated to perform printing, another one is executed during the one cycle. Printer is in a non-operational state. Therefore, in order to shorten the stacking lead time (the time required to obtain a stacked body having a required film thickness), there is no choice but to shorten the transport tact of the pallet substrate.

However, if the transport tact of the pallet substrate is accelerated, the staying time of the pallet substrate 10 in the main drying zone 47, that is, the main drying time of the paste is shortened. Will be triggered. Therefore, in order to prevent the occurrence of internal cracks, it is necessary to sufficiently dry the paste in the lower layer when stacking the pastes, and it takes a long time to dry the far-infrared heater in the main drying zone 47.

In view of the above points, the present invention devises a drying configuration (method) for printing and stacking pastes to enable paste printing by a screen printing machine a plurality of times in one cycle, and to stack leads. An object of the present invention is to provide a paste laminating method and device by screen printing that realizes a reduction in time.

[0008]

In order to achieve the above object, a paste laminating method by screen printing of the present invention comprises a plurality of screen printing machines for screen-printing a paste on a pallet substrate, and a pallet after screen printing.
The main drying zone for main drying the printed circuit board and the pallet after main drying.
Using a cooling zone for cooling the preparative substrate, the temporary drying means comprising a hot air generator for paste surface drying during said plurality of screen printing machine provided with a predetermined screen printing machine
Screen print a specified paste on the pallet board,
And said paste by blowing hot air to the pallet upper surface of the substrate on the conveyor by passing said predrying means conveys the pallet substrate conveyor and the surface dryness
After that, a step of screen-printing the next paste with a next screen printing machine is provided in a region other than the printing area of the paste on the pallet substrate, and in the main drying zone,
Set the pressure in the drying zone higher than the external pressure
It is characterized by being dried.

Further, the screen printing paste laminating apparatus of the present invention comprises a plurality of screen printing machines, a main drying zone, a cooling zone, and a conveyer for conveying pallet substrates. screen printing paste on the pallet on a substrate according to the present drying in the drying zone, in the which sequentially repeated for each step of cooling in the cooling zone, between the plurality of screening <br/> screen printing machine A temporary drying means equipped with a hot air generator for drying the paste surface is installed in the
Paste on the pallet board that is screen-printed
Surface drying of the paste by blowing hot air with temporary drying means
State, and the paste printing area on the pallet substrate
Besides the following paste screen the next screen printing machine
Printing , arranging hot air drying means in the main drying zone,
The main drying is performed by setting the pressure inside the main drying zone higher than the outside pressure.

[0010]

[0011]

[0012]

In the paste laminating method and apparatus by screen printing according to the present invention, provisional drying means for drying the paste surface is provided between a plurality of screen printing machines, and the paste is dried on the surface by passing through the provisional drying means. Since the next paste is screen-printed in the area other than the paste printing area on the pallet board, the offset of the previous paste occurs on the back surface of the screen when the next paste is printed. Ru can be prevented. In this way , different printing patterns are printed once each in one cycle from screen printing to main drying and cooling of the paste, that is, at least two screen printing machines each perform one printing.
It is possible to perform screen printing one by one. Therefore, compared with the conventional configuration in which screen printing can be performed only once in one cycle, a plurality of screen printing machines can be effectively used, the lead time required for stacking can be shortened, and a multilayer chip component can be obtained. Manufacturing costs can be reduced.

Further, when hot air drying means is provided in the main drying zone and the pressure inside the main drying zone is set higher than the outside pressure, the paste is dried with hot air, so that the paste drying is compared. It can be done substantially completely in a very short time, cracks can be prevented, the yield of the laminate can be improved, and since the pressure inside the main drying zone is higher than the pressure outside, dust inside the main drying zone It is unlikely to be affected by the external atmosphere, such as dust and dirt, and can maintain the high temperature inside the main drying zone due to hot air.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a screen printing paste laminating method and apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view of an embodiment of a screen printing paste laminating method and apparatus according to the present invention, and FIG. 2 is a general view.

In these figures, a screen printing paste laminating apparatus includes four screen printing machines 1 for screen printing paste on a pallet substrate.
2,3,4, three temporary dryers 11, 12, 13 as temporary drying means for drying the paste surface, leveling zone 5, pallet substrate transfer descending elevator 6, main drying zone 7, cooling zone 8 and pallet It is composed of a board transfer lift elevator 9.

Reference numeral 10 denotes a pallet substrate having a flat upper surface, which is transported in the transport direction shown by the arrow in FIG. 1 in the apparatus, and a conductor paste, a magnetic paste or a non-conductive paste is deposited on the upper surface of the substrate. A laminated body is formed by repeatedly laminating a conductor pattern, a magnetic body pattern, a non-magnetic pattern, etc. by a screen printing using a magnetic body paste or the like. The upper surface of the substrate has an area in which several tens to several thousands of component patterns can be arranged per pallet so that a large number of desired laminated chip components can be obtained from the laminated body to be produced. The transfer path for the pallet board 10 includes an upper transfer path for transferring the pallet board 10 to the left when viewed from the front, a lower transfer path for transferring the pallet board 10 to the right, and a pallet board transfer descending elevator 6 at both ends. It has a rectangular shape that is closed by the lift elevator 9 for transferring pallet substrates.
As shown in FIG. 5, a forward belt conveyor 15 is provided on the upper conveyance path connecting the screen printing machines 1 to 4 and the leveling zone 5, and a return belt on the lower conveyance path connecting the main drying zone 7 and the cooling zone 8. A conveyor 16 is provided and conveys between the descending elevator 6 and the ascending elevator 9, respectively.

As shown in FIG. 2, screen printing machines 1 to 4
Are screens 21, 22 of different printing patterns.
23 and 24 are set, and are arranged at equal intervals so that the screens 21 to 24, that is, the printing surfaces are located on the forward path side belt conveyor 15. It should be noted that illustration of a positioning mechanism for the pallet substrate 10 when performing screen printing is omitted. These screens 21
To 24 are desired laminated chip parts, several tens to several tens.
An array of 00 component patterns is formed. A temporary dryer 11 is provided between the screen printers 1 and 2, a temporary dryer 12 is provided between the screen printers 2 and 3, and a temporary dryer 13 is provided between the screen printers 3 and 4. (In FIG. 2, it is shown in the upper part between the printing machines), and each of the temporary dryers 11, 12 and 13 blows hot air onto the upper surface of the pallet substrate 10 conveyed on the outward belt conveyor 15. It is equipped with a generator.

The leveling zone 5 is a pallet substrate 1 whose upper surface is printed with paste by the screen printers 1 to 4.
This is a section in which 0 is conveyed to the descending elevator 6 in a stable state. Here, the unevenness of the applied paste surface immediately after printing is made substantially flat by the surface tension while being conveyed.

The descending elevator 6 receives the pallet substrate 10 conveyed by the outward belt conveyor 15 from the outward belt conveyor 15 by the substrate transfer mechanism 25, lowers the pallet substrate 10, and the loader 26 returns the backward belt conveyor. 16 is to be transferred.

A substrate drying chamber (substrate drying section) 27 is provided in the main drying zone 7. The substrate drying chamber 27 has an inlet and an outlet on both sides through which the return-side belt conveyor 16 passes, and hot air is supplied to the drying chamber from a substrate drying heater (hot air supplier) 35 which is a hot air drying means provided outside. That is, the paste on the upper surface of the pallet substrate 10 passing through the drying chamber is substantially completely dried. In addition,
The internal pressure of the substrate drying chamber 27 is set to be higher than the pressure (atmospheric pressure) in the facility where this device is installed. As a result, the influence of the atmosphere inside the facility which the substrate drying chamber 27 receives is reduced.

A substrate cooling chamber (substrate cooling section) 28 is provided in the cooling zone 8. The substrate cooling chamber 28 has an inlet and an outlet on both sides through which the backward belt conveyor 16 passes,
Air (same as room temperature or cold air may be blown) is blown into the cooling chamber through a plurality of ventilation holes 36 provided on the floor of the cooling chamber, and is exhausted outside the cooling chamber through an exhaust hole 37. Pallet substrate 1 heated in the drying chamber 27
It receives 0 to cool.

The ascending elevator 9 receives the pallet board 10 conveyed by the return belt conveyor 16 from the return belt conveyor 16 by the loader 29, raises the pallet board 10, and the board transfer mechanism 30 moves the forward belt conveyor. 15 is to be transferred.

The pallet board 10 is supplied to and recovered from the apparatus by a board supply / recovery mechanism 31 provided above the forward path side belt conveyor 15 on the ascending elevator 9 side.

Next, the overall operation of the above embodiment will be described. Here, as an example of a laminated body created by this apparatus, an MH configured by laminating the print patterns shown in FIG.
An example of stacking of D (Multilayer Circuit Hybrid Device) products will be described. This MHD has a non-magnetic pattern 41
And a magnetic material pattern 42 and a conductor pattern 43. In order to create the MHD, for example, three screen printing machines 1, 2, 4 among the four screen printing machines 1 to 4 are used. To use. The MHD is a combination of a non-magnetic pattern 41 and a magnetic material pattern 42 shown in FIG.
A layer as shown in the right half of (the actual A layer exists symmetrically not only in the illustrated right half but also in the left half),
A B layer as shown in the left half of FIG. 3 in which the conductor pattern 43 and the magnetic material pattern 42 are combined (actually, this B layer exists symmetrically not only in the left half but also in the right half). They are laminated alternately, and each layer has 2
The types of patterns do not overlap. On the screens 21, 22, and 24 of the screen printing machines 1, 2, and 4, the patterns 41, 42, and 43 are arrayed in a predetermined number (several tens to several thousands).

First, the pallet board 10 is received from the board supply / recovery mechanism 31 of FIG. The pallet board 10 is a forward belt conveyor 15
The non-magnetic pattern 41 is printed on the upper surface of the substrate by the screen printing machine 1 using the non-magnetic paste on the top surface of the substrate [performing one printing operation by a squeegee of the screen printing machine is 1 pass Printing of the first pass] is performed here. Pallet board 10
Is conveyed by the outward belt conveyor 15 as it is and passes through the temporary dryers 11, 12 and 13, and the surface of the paste on the upper surface of the substrate is temporarily dried by the hot air from the temporary dryers 11, 12 and 13. Then, the magnetic printing pattern 42 is printed (second pass printing) by the screen 24 using the magnetic paste in the screen printing machine 4 (this magnetic paste is a portion other than the printing area of the non-magnetic paste). Printed on). At the time of this printing, since the paste surface of the first pass is dried by the hot air of the temporary dryers 11 to 13, there is no set-off of the paste on the back surface of the screen 24, and the printing by the screen 24 is executed without any trouble. In this way, the non-magnetic pattern 4
A layer in which 1 and the magnetic material pattern 42 are combined is formed on the upper surface of the pallet substrate 10.

Next, the pallet board 10 is conveyed to the board transfer mechanism 25 through the leveling zone 5 in a stable state by the outward belt conveyor 15. While being conveyed through the leveling zone 5, the irregularities on the paste surface of the patterns 41 and 42 printed by the screen printing machines 1 and 4 become substantially flat. The pallet board 10 is received by the descending elevator 6 from the board transfer mechanism 25,
It is lowered by the descending elevator 6, and is transferred onto the return-side belt conveyor 16 via the loader 26. And
The pallet substrate 10 is conveyed by the belt conveyor 16 and sent to the inside of the substrate drying chamber 27 in the main drying zone 7. Inside the substrate drying chamber 27, the A layer is formed on the upper surface of the pallet substrate 10 by the hot air blown from the substrate drying heater 35.
The pass 2 paste and the pass 2 paste are substantially completely dried. The pallet substrate 10 on which the paste has been main dried is transferred to the substrate drying unit 27 by the belt conveyor 16.
To the inside of the substrate cooling chamber 28 in the cooling zone 8.
In the substrate cooling chamber 28, the pallet substrate 10 to be transported is transferred.
Air is blown from a plurality of ventilation holes 36 to the substrate drying chamber 27.
The pallet substrate 10 heated by is cooled. The cooled pallet board 10 is loaded by the belt conveyor 16 into the loader 29.
It is conveyed to and is placed on the ascending elevator 9 by the loader 29. The elevator 9 raises the pallet substrate 10 and transfers it onto the outward belt conveyor 15 by the substrate transfer mechanism 30. In addition, one continuous cycle from screen printing by the above printing machine (including temporary drying during that time) to main drying and cooling is one cycle.

The pallet substrate 10 rested on the outward belt conveyor 15 is conveyed as it is. Then, a screen printer 2 is used to print the image on the layer A as shown in FIG.
The conductor pattern 43 is printed (third pass printing) by the screen 22 using the conductor paste shown in FIG. The pallet substrate 10 is conveyed as it is by the outward belt conveyor 15, and the paste of the third pass on the upper surface of the substrate is the temporary dryer 1.
The surface is temporarily dried by hot air from Nos. 2 and 13. Then, the screen printer 4 prints the magnetic pattern 42 (printing of the fourth pass) by the screen 24 using the magnetic paste (this magnetic paste is printed on a portion other than the printing area of the conductor paste). Be done). During this printing, since the paste surface of the third pass has been dried by the temporary dryers 12 and 13, there is no set-off of the paste on the back surface of the screen 24. In this way, the screen printing machine 2,
4, the B layer in which the conductor pattern 43 and the magnetic material pattern 42 are combined is formed on the A layer on the upper surface of the pallet substrate 10.

Then, the pallet substrate 1 on which the B layer is formed
0 is flattening of the paste surface of the B layer (the third pass and the fourth pass) in the leveling zone 5, the main drying of the paste of the B layer in the substrate drying chamber 27, as in the first cycle.
The second cycle is completed after each step of cooling in the substrate cooling chamber 28, and the sheet is again placed on the outward belt conveyor 15 on the ascending elevator 9 side.

Thereafter, similarly, each step from the printing of the non-magnetic pattern 41 and the magnetic material pattern 42 using the screen printing machines 1 and 4 performed in the first cycle to the main drying and cooling and the second cycle are performed. The steps from the printing of the conductor pattern 43 and the magnetic material pattern 42 using the screen printing machines 2 and 4 to the main drying and cooling are alternately repeated every cycle, and the A layer and the B layer are alternately arranged on the upper surface of the pallet substrate 10. Then, the laminated body is continuously laminated until the laminated body has a predetermined thickness. When the laminated body reaches a predetermined thickness, the substrate supply / recovery mechanism 31 recovers the pallet substrate 10 from the apparatus.

Actually, the pallet board 10 is sequentially supplied to the carrying path by the board supply / recovery mechanism 31, and the above-mentioned laminated body forming step is performed on many pallet boards 10.

According to the above embodiment, the following effects can be obtained.

(1) Provision of temporary dryers 11, 12, 13 between each of the four screen printers 1 to 4 so that at least one temporary dryer is passed after the first printing in each cycle. Set the stacking process to (program),
The pallet substrate 10 on which the paste is printed by the screen printing machines 1, 2, 3 is temporarily dried with the transportation.
Since the surface of the printed paste is tentatively dried by at least one of the screen printing machines 3,
Even when the second and subsequent screen printings in 3 and 4 are performed, the set-off of the paste on the back surface of the screen does not occur. For this reason,
Screen printing can be performed at least twice in one cycle without any trouble. For example, in the first cycle, the non-magnetic pattern 41 and the magnetic material pattern 4 are made by the screen printing machines 1 and 4.
2 and are printed, and in the second cycle, screen printing machine 2, 4
By doing so, it becomes possible to print two different types of print patterns, one pass each in one cycle, as if the conductor pattern 43 and the magnetic material pattern 42 were printed.

(2) Since it is not necessary to shorten the transfer tact of the pallet substrate 10, the staying time in the main drying zone 7 can be sufficiently secured, the paste can be dried reliably, and cracks can be prevented from occurring. You can

(3) Therefore, as compared with the conventional configuration in which only one pass can be printed in one cycle, a plurality of screen printing machines can be effectively used and the lead time required for stacking can be shortened (1/2). .0 to about 1.2.4) can be achieved (substantially double speed lamination is possible), and the manufacturing cost of the laminated chip component can be reduced (about 18 to
35% decrease).

(4) Even though the number of times the pallet substrate 10 passes through the main drying zone 7 per pallet has been reduced to about half, the paste is dried in the substrate drying chamber 27 by hot air, so comparison is made. The paste can be dried substantially completely in a very short time, cracks can be prevented from occurring, and the yield of the laminate can be improved.

(5) Since the internal pressure of the substrate drying chamber 27 is set to be higher than the pressure (atmospheric pressure) in the facility in which this device is installed, dust and dust will enter the inside of the substrate drying chamber 27. It is designed not to be affected by the atmosphere inside the facility.

(6) Elevators 6 and 9 can be provided on both sides of the upper and lower conveyors 15 and 16 to circulate the pallet substrate 10, and the steps of printing, drying and cooling can be automatically executed in an automated line.

In the above embodiment, four screen printing machines are provided, and three printing machines are used to perform two cycles of the step of performing paste printing twice for each cycle and two types of paste layers. Although (A layer and B layer) is laminated, the number of prints per cycle (the number of screen printing machines used), the pattern shape and the type of paste layer can be changed as appropriate depending on the specifications of the laminate to be created. is there.

The combination of print patterns (pastes) for each cycle for forming the paste layer is 1
If the patterns to be printed in the cycle are not overlapped, for example, in the above embodiment, it is possible to combine four patterns (pastes of different types) by using all four printing machines per cycle.

The number of screen printing machines installed can be increased or decreased as appropriate. In this case, a temporary dryer is installed between adjacent screen printing machines, and at least one machine is installed after printing the paste except the last printing in each cycle. The lamination process may be programmed to pass through the temporary dryer.

[0042]

[0043]

Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Let's do it.

[0045]

As described above, according to the present invention,
A temporary drying means for drying the paste surface is provided between a plurality of screen printing machines, and the paste on the pallet substrate is brought into a surface dried state by passing through the temporary drying means .
Since the next paste is screen-printed in a region other than the print area, it is possible to prevent the offset of the previous paste onto the back surface of the screen when the next paste is printed . As a result, different types of pastes or print patterns can be printed once (a total of a plurality of passes) in one cycle from the screen printing to the main drying and cooling of the paste. Therefore, compared with the conventional configuration in which only one print pattern can be screen-printed only once in one cycle, a plurality of screen printers can be effectively used in each cycle, and the lead time required for stacking can be shortened. Therefore, the manufacturing cost of the laminated chip component can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic front view of an embodiment of a screen printing paste laminating method and apparatus according to the present invention.

FIG. 2 is a perspective view showing an overview of an embodiment.

FIG. 3 is a plan view showing a combination of print patterns of an HMD as an example of a layered chip component created in an example.

FIG. 4 is a front view showing a conventional paste laminating apparatus.

[Explanation of symbols]

1,2,3,4 screen printer 5 Leveling zone 6 Pallet substrate transfer elevator 7 books drying zone 8 cooling zones 9 Pallet Board transfer elevator 10 Pallet board 11, 12, 13 Temporary dryer 15 Outward belt conveyor 16 Return side belt conveyor 27 Substrate drying room 28 Substrate cooling room 35 Substrate drying heater

Continuation of the front page (56) Reference JP-A-63-62218 (JP, A) JP-A-55-25304 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01G 4 / 00-4/10 H01G 4/14-4/42 H01G 13/00-13/06

Claims (2)

(57) [Claims] 1. A plurality of screen printing machines for screen-printing a paste on a pallet substrate , and screen printing
Main drying zone and main drying for the subsequent pallet substrate
A cooling zone for cooling the pallet substrate after
A method of stacking pastes by lean printing, wherein a temporary drying means including a hot air generator for drying the paste surface is provided between the plurality of screen printing machines , and a predetermined screen printing machine is used to set a predetermined page on a pallet substrate.
The strike by screen printing, after the pace <br/> DOO by blowing hot air to the pallet upper surface of the substrate on the conveyor by passing said predrying means conveys the pallet substrate conveyor and the surface dryness , The pallet on the pallet substrate
Paste the next paste to the next screen outside the print area
In addition to the step of screen printing with a printing machine, in the main drying zone, the pressure in the main drying zone is
A screen printing paste laminating device characterized by performing main drying at a pressure higher than the pressure . 2. A screen printing machine comprising a plurality of screen printing machines, a main drying zone, a cooling zone, and a conveyor for transporting the pallet board, the screen printing of the paste onto the pallet board by the screen printing machine, In a paste laminating apparatus by screen printing in which the steps of main drying in the main drying zone and cooling in the cooling zone are sequentially repeated, a hot air generator for drying the paste surface is provided between the plurality of screen printing machines. the temporary drying means arranged, predetermined scanning
Screen printing of the specified paste on a clean printing machine
Before spraying hot air onto the pallet substrate with the temporary drying means
The paste is dried on the surface, and the paste is placed on the pallet substrate.
In addition to the print area of the paste
Screen printing by means of a screen printing machine , arranging hot air drying means in the main drying zone, and performing main drying by setting the pressure inside the main drying zone higher than the external pressure. Paste laminating equipment by.