WO2022254598A1

WO2022254598A1 - Rotary screen printing device and rotary screen printing method

Info

Publication number: WO2022254598A1
Application number: PCT/JP2021/020953
Authority: WO
Inventors: 一夫小島; 邦貴長谷川; 翔平葛巻; 浩一松居; 茂西木
Original assignee: マイクロ・テック株式会社; アサダメッシュ株式会社
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-12-08
Also published as: TW202248035A

Abstract

Provided is a rotary screen printing device (100) which uses an annular screen plate (50) to perform printing on a workpiece (101), the rotary screen printing device comprising: a blade (84) which is disposed in front of a printing position P, forms an ink reservoir (99) on a front surface thereof, and coats the annular screen plate (50) with an ink (83); and a squeegee (82) which is disposed at the printing position P, and uses the ink (83) coated by means of the blade (84) to performing printing without forming the ink reservoir (99) on a front surface thereof.

Description

ROTARY SCREEN PRINTING DEVICE AND ROTARY SCREEN PRINTING METHOD

The present invention relates to a rotary screen printing apparatus and a rotary screen printing method.

Conventionally, there have been rotary screen printing devices that use an annular screen plate.

Japanese Patent Publication No. 2015-530281 Japanese Patent Application Laid-Open No. 2003-191434

A conventional rotary screen printer uses an annular screen plate, which complicates the supply of ink.
The present invention provides a rotary screen printing apparatus and a rotary screen printing method capable of appropriately supplying ink and printing a print pattern accurately.

The rotary screen printing device of the present invention is
In a rotary screen printing device that prints on a work using an annular screen plate,
a blade disposed in front of a printing position and coating the annular screen plate with ink in a state in which an ink pool is formed on the front surface;
a squeegee positioned at a printing position and printing with the ink coated by the blade with no ink pool on the front surface.

According to the present invention, since the squeegee is printed using the ink coated by the blade, the amount of ink supplied can be made appropriate.

1 is a schematic perspective view of a rotary screen printer 100 according to Embodiment 1. FIG. 1 is a schematic cross-sectional view of a rotary screen printer 100 according to Embodiment 1. FIG. 1 is a perspective view of an annular screen plate 50 according to Embodiment 1. FIG. Fig. 2 is a partial cross-sectional perspective view of an outer surface 52 and an inner surface 54 of the annular screen plate 50 according to Embodiment 1; 1 is a front view of a rotary screen printer 100 according to Embodiment 1; FIG. 1 is a side view of a rotary screen printer 100 according to Embodiment 1; FIG. FIG. 2 is an enlarged side view of a squeegee 82 and a blade 84 according to Embodiment 1; 4A and 4B are explanatory diagrams of a printing method according to the first embodiment; FIG. 4 is a state diagram of ink 83 in Embodiment 1. FIG. FIG. 4 shows a modification of the blade 84 according to Embodiment 1; FIG. 4 shows a modification of the blade 84 according to Embodiment 1; FIG. 4 shows a modification of the blade 84 according to Embodiment 1; FIG. 4 shows a modification of the blade 84 according to Embodiment 1; FIG. 4 shows an example of attachment of the blade 84 according to the first embodiment; 4A and 4B are views showing an example of attachment of the cover 75 according to the first embodiment; FIG. FIG. 2 is a schematic perspective view of a rotary screen printer 100 according to Embodiment 2; FIG. 2 is a schematic perspective view of a rotary screen printer 100 according to Embodiment 2; The figure which shows the belt-shaped annular screen plate|board 50 in Embodiment 3. FIG.

Reference numerals are used in the description below, but the reference numerals are not intended to limit the scope of the claims.
In the drawings, XYZ are directions orthogonal to each other.
"Up and down" refers to the Z direction in the drawing, and means up and down in the vertical direction.
Width is the length in the Y direction of the drawing and means the length in the horizontal direction.
Front, front, or forward means the left side of the drawing in the X direction.
Rearward, rearward, or rear means to the right in the X direction of the drawing.

Embodiment 1.

***Description of the general configuration of the rotary screen printer 100***
FIG. 1 is a schematic perspective view of a rotary screen printer 100 using an annular screen plate 50. FIG.
FIG. 2 is a schematic cross-sectional view of a rotary screen printer 100 using an annular screen plate 50. As shown in FIG.
1 and 2, P is the printing position of the annular screen plate 50. As shown in FIG.
1 and 2, Q is the coating position of the annular screen plate 50. As shown in FIG.

● Squeegee 82
The rotary screen printing apparatus 100 has a squeegee 82 that pushes ink 83 from the inner surface 54 of the annular screen plate 50 toward the outer surface 52 .
The squeegee 82 is a spatula made of rubber or urethane.

●Blade 84
The rotary screen printer 100 has a blade 84 that coats the inner surface 54 of the annular screen plate 50 with ink 83 .
The blade 84 is arranged at the coat position Q on the front side of the print position P. As shown in FIG.
The blade 84 is a flat plate made of stainless steel or other metal.
Blade 84 is a rectangular plate, and blade 84 has no holes.

● Ink 83
Ink 83 is supplied to the inner surface 54 of the annular screen plate 50 by an ink supply (not shown).
The ink supply supplies ink 83 only in front of the blade 84 and not between the squeegee 82 and the blade 84 .
The ink 83 may be paste, cream solder, dye, or other viscous liquid substances.
A preferred specific example of the ink 83 is a silver paste (DNS-0404P) manufactured by Daicel Corporation.

● Ink pool 99
Ink 83 forms an ink pool 99 in front of blade 84 .
The ink pool 99 exists only in front of the blade 84 and does not exist in front of the squeegee 82 .

● Roller 200
The rotary screen printing device 100 has rollers 200 .
The roller 200 is arranged directly below the printing position P. As shown in FIG.
The roller 200 has a cylindrical shape with the same diameter as the annular screen plate 50 .
The roller 200 is made of rubber, urethane, silicone, resin, or metal.

● Work 101
The workpiece 101 is a long flexible film substrate.
The work 101 is unwound from one conveying roller 90 and wound around the other conveying roller 90 .
A print line 102 is printed on the work 101 .
The printed lines 102 are electrode patterns or wiring patterns.

***Description of Configuration of Annular Screen Plate 50***
●Overall Configuration of Annular Screen Plate 50 Based on FIG. 3, the overall configuration of the annular screen plate 50 will be described.
The annular screen plate 50 is an endless metal mask screen used in rotary screen printers.
The annular screen plate 50 is used as a plate for continuous pattern printing by a rotary screen printer.
The annular screen plate 50 shown in FIG. 3 is a cylindrical screen plate made of a ring-shaped plate material.

The annular screen plate 50 has a cylindrical or ring-shaped screen 51 .
The screen 51 is a perforated metal belt and a perforated metal belt.
FIG. 3 shows a case where there are three parallel printed patterns at regular intervals.
The annular screen plate 50 has a diameter of 10 cm to 30 cm.

The annular screen plate 50 has end rings 59 at both ends.
The end ring 59 is an annular metal ring.
The end ring 59 secures the screen 51 with screws 112 .
The end ring 59 is attached to a drive mechanism (not shown), and the annular screen plate 50 is rotated by the drive mechanism.
The rotation speed is 1/3 rotation/second and the peripheral speed of the screen 51 is 100 mm to 300 mm per second.

The outer surface 52 and the inner surface 54 of the annular screen plate 50
The screen 51 has an outer surface 52 on its outer circumference and an inner surface 54 on its inner circumference.
FIG. 4 is a partial cross-sectional perspective view of the outer surface 52 and the inner surface 54 of the annular screen plate 50. FIG.

●Groove 60 (printing pattern on workpiece)
The outer surface 52 has a plurality of parallel grooves 60 .
FIG. 4 shows the case where there are two parallel grooves 60 .
Groove 60 is a continuous printed pattern formed on outer surface 52 .
A continuous pattern is printed by filling the grooves 60 with the ink 83 and transferring the ink 83 .

●Recess 62
The groove 60 forms an annular recess 62 .
The concave portion 62 is a U-shaped groove or U-shaped groove formed continuously in the longitudinal direction.
The recesses 62 are spaces formed in the outer surface 52 of the screen 51 of the annular screen plate 50 .
The concave portion 62 is a space for storing the ink pushed out from the through hole 66 and arranging it into a straight shape.

The groove 60 has a depth from the bottom surface 63 of the recess 62 to the outer surface 52 of the screen 51 .
The depth of the grooves 60 is 30% or more and 90% or less of the thickness of the screen 51, preferably 60% or more and 90% or less, and preferably 80%.
The width of the groove 60 is the width of the printed pattern and can be 50 μm or less, and can be 100 μm, 200 μm, 500 μm, or any other width.

● Through hole 66 (ink supply pattern)
The groove portion 60 has a through hole 66 penetrating from the bottom surface 63 of the concave portion 62 to the inner surface 54 of the screen 51 of the annular screen plate 50 .
The through hole 66 is cylindrical or rectangular.
The through holes 66 are arranged in a predetermined arrangement pattern in the groove portion 60 .
A through hole 66 is also formed in the joint portion 56 to which the end portion 58 is joined.
The through-hole 66 is a hole for pushing the conductive ink 83 inside with a squeegee and allowing the ink 83 to pass outside when the annular screen plate 50 is formed.
The size (diameter or side length) of the through hole 66 is preferably 10 μm or more and 30 μm or less, preferably 20 μm.

In the screen 51, the total area of the inner surface 54 of the ink supply pattern (plurality of through holes 66) is smaller than the total area of the outer surface 52 of the print pattern (grooves 60) on the work.
In the screen 51, the total volume of the ink supply patterns (plurality of through holes 66) is smaller than the total volume of the print patterns (grooves 60) on the workpiece.

***Description of the configuration of the rotary screen printer 100***
FIG. 5 is a front view of a rotary screen printer 100 using an annular screen plate 50. FIG.
FIG. 6 is a side view of a rotary screen printer 100 using an annular screen plate 50. FIG.

●Base 70
A rotary screen printer 100 has a pair of bases 70 .
The end ring 59 of the annular screen plate 50 is rotatably attached to the base 70 by an attachment mechanism (not shown).
An open window 78 is formed in the center of the base 70 .

● Vertical mechanism 71
The rotary screen printer 100 has an up-down mechanism 71 .
The vertical movement mechanism 71 is a mechanism that simultaneously moves the blade 84 and the squeegee 82 vertically by the same amount.
The vertical mechanism 71 is a mechanism that applies printing pressure to the squeegee 82 during printing.
The vertical mechanism 71 has a pair of cylinders 72 , a pair of vertical columns 73 and one horizontal column 74 .
A pair of cylinders 72 are fixed on the pair of bases 70 .
The pair of upper and lower pillars 73 are arranged outside the pair of bases 70 .
A pair of vertical columns 73 are moved up and down by a pair of cylinders 72 .
Both ends of the horizontal column 74 are fixed to the lower ends of the pair of upper and lower columns 73 .
The horizontal posts 74 pass through the hollow portion of the annular screen plate 50 and the windows of the pair of bases 70 .
Horizontal post 74 secures squeegee 82 and blade 84 .
The horizontal post 74 fixes the squeegee 82 so that the tip of the squeegee 82 is at the printing position P. As shown in FIG.
The horizontal post 74 fixes the blade 84 so that the tip of the blade 84 is at the court position Q. As shown in FIG.
Blade 84 has a width that is longer than the width of squeegee 82 .

● Squeegee 82 and blade 84
FIG. 7 is an enlarged side view of squeegee 82 and blade 84 according to the first embodiment.
The left side of the squeegee 82 and blade 84 at the inner lower portion of the annular screen plate 50 in FIG.
The right side of the squeegee 82 and blade 84 at the inner lower portion of the annular screen plate 50 in FIG. 7 is referred to as the rear, rear side, or rear.
During printing, printing pressure is applied to the squeegee 82 in the downward direction of the vertical line A by the up-down mechanism 71 .
Even if printing pressure is applied to the squeegee 82 during printing, the blade 84 does not push the screen 51. - 特許庁
The blade 84 is fixed so that it just touches or is slightly separated from the inner surface 54 of the annular screen plate 50 during printing.
The blade 84 has a parallel surface 86 parallel to the tangent line G on its bottom surface.
The front and bottom surfaces of blade 84 are perpendicular.
The parallel surfaces 86 allow the ink 83 to fill the through holes 66 and allow excess ink 83 on the inner surface 54 of the annular screen plate 50 to be scraped off.
The gap between the inner surface 54 of the annular screen plate 50 and the parallel surface 86 is the thickness of the coated ink.

● Ink pool 99
As shown in FIG. 7, only in front of the blade 84 is formed an ink reservoir 99 of ink supplied from an ink supply device.
There is no ink reservoir 99 in front of the squeegee 82 .
Squeegee 82 prints only with the ink coated by blade 84 .

●Printing angle D
In FIG. 7 , C is the center of rotation of the annular screen plate 50 .
The squeegee 82 is arranged so as to intersect the tangent line F of the inner surface 54 of the annular screen plate 50 at a predetermined printing angle D (D<90 degrees).
The lower end of the squeegee 82 exists on a vertical line A passing through the center of rotation C and coincides with the printing position P.

●Court angle E
The front surface of the blade 84 is arranged so as to cross the tangent line G of the inner surface 54 of the annular screen plate 50 at right angles (court angle E=90 degrees).
If the coat angle E is smaller than the print angle D, the embedding amount of the ink 83 may become too large, so the coat angle E is preferably larger than the print angle D (coat angle E>print angle D).
The coat angle E is set to less than 90 degrees when more ink 83 is to be embedded, and the coat angle E is more than 90 degrees when less ink 83 is to be embedded.
If the coat angle E is too large, the ink 83 in the ink pool 99 will likely run over the top of the blade 84 .
The coat angle E is preferably 60 degrees or more and 120 degrees or less (60 degrees≦coat angle E≦120 degrees), and preferably 80 degrees or more and 100 degrees or less (80 degrees≦coat angle E≦100 degrees).
When the front surface and the bottom surface of the blade 84 are perpendicular to each other, in order to prevent the screen 51 from being damaged at the angle between the front surface and the bottom surface of the blade 84, the coat angle E is set to more than 90 degrees, and 100 degrees or more and 120 degrees. (100 degrees≦coating angle E≦120 degrees).

● Mounting angle H
The blades 84 are arranged along a straight line B passing through the center of rotation C. As shown in FIG.
A mounting angle H between the vertical line A and the straight line B is less than 90 degrees and greater than 0 degrees.
If the mounting angle H is made small, the squeegee 82 and the blade 84 will come into contact with each other.
If the mounting angle H is increased, the possibility that the ink 83 in the ink reservoir 99 will flow outward from both ends of the blade 84 will increase.
The mounting angle H is preferably 20 degrees or more and 60 degrees or less (20 degrees ≤ mounting angle H ≤ 60 degrees), and preferably 30 degrees or more and 45 degrees or less (30 degrees ≤ mounting angle H ≤ 45 degrees).

● Residual ink 96
The rotary screen printing apparatus 100 does not have a scraping member and a scraping mechanism for scraping the residual ink 96 remaining on the inner surface 54 of the annular screen plate 50 after printing.
The rotary screen printer 100 does not scrape off residual ink 96 remaining on the inner surface 54 of the annular screen plate 50 after printing.
The rotary screen printing apparatus 100 rotates the annular screen plate 50 while the residual ink 96 is adhered to the inner surface 54 of the annular screen plate 50 .
The blade 84 scrapes off residual ink 96 adhering to the inner surface 54 of the annular screen plate 50 and collects it in an ink reservoir 99 .

*** Explanation of rotary screen printing method ***
FIG. 8 is a developed view of the annular screen plate 50 viewed radially from the center of rotation.
A rotary screen printing method will be described based on FIG.

● Step S1. Fixing step The blade 84 and the squeegee 82 are fixed to the horizontal post 74 .

● Step S2. Placement Step The horizontal column 74 is lowered, the blade 84 is placed at the coat position Q ahead of the print position P, and the squeegee 82 is placed at the print position P. FIG.

● Step S3. Ink supply step Ink 83 is supplied in front of blade 84 to form ink reservoir 99 only on the front surface of blade 84 .
No ink 83 is supplied between the blade 84 and the squeegee 82 .
No ink reservoir 99 is formed on the front surface of the squeegee 82 .

● Step S4. Coating Step The annular screen plate 50 is rotated, and the blade 84 coats the inner surface 54 of the annular screen plate 50 with the ink 83 .
The blade 84 coats the annular screen plate 50 with the coat ink 98 while filling the through holes 66 with the ink 83 as the filling ink 95 .

First, the blade 84 pushes the filling ink 95 into the through hole 66 .
Further, the blade 84 pushes out the filling ink 95 in the through hole 66 into the groove 60 .
The filling ink 95 extruded from the through hole 66 spreads over the bottom surface 63 of the groove 60 and accumulates in the recesses of the groove 60 .
Blade 84 fills ink 83 in an amount sufficient to at least cover bottom surface 63 of groove 60 with fill ink 95 .
Preferably, blade 84 fills ink 83 until fill ink 95 fills channel 60 more than half the depth.
Further, preferably, blade 84 fills ink 83 until fill ink 95 fills groove 60 more than two-thirds of the depth.
On the other hand, the blade 84 should not fill the fill ink 95 so much that it overflows the groove 60 .
Blade 84 must not allow ink fill 95 to protrude beyond outer surface 52 .
The blade 84 may be filled with the ink 83 until the thickness of the filling ink 95 is two thirds or more and three quarters or less of the thickness of the screen 51 .

During coating, blade 84 continues to block ink 83 in ink pool 99 from flowing behind blade 84 .
During coating, blade 84 continues to form a puddle 99 only in front of blade 84 .

● Step S5. Printing Process The squeegee 82 prints using only the fill ink 95 imbedded by the blade 84 and the coated coat ink 98 .

● Step S6. Post-process Do not scrape off residual ink remaining on the inner surface 54 of the annular screen plate after printing.
The annular screen plate 50 is rotated while the residual ink is adhered to the inner surface 54 of the annular screen plate 50 .

● Step S7. Recovery Step The residual ink adhering to the inner surface 54 of the annular screen plate 50 is recovered by the blade 84 in the ink reservoir 99 of excess ink.
Thereafter, steps S4 to S7 are repeated.

***Description of printing method and printing condition***
● Ink pool 99
In front of blade 84 is an ink reservoir 99 .
The width of ink pool 99 is less than the width of blade 84 .
The ink 83 is viscous and does not flow out behind the blade 84 from the outer ends of the blade 84 .

●Coat ink 98
A coating region H1 coated with ink 83 is formed behind the blade 84 .
The width of the coating region H1 is the same as the width of the ink reservoir 99. As shown in FIG.
Coated region H1 has coat ink 98 in which ink 83 is formed in the form of a thin film.
In front of squeegee 82 is coating area H1.
The width of the squeegee 82 is smaller than the width of the coating area H1.
Therefore, the area outside the width of the squeegee 82 in the coating area H1 becomes the unused non-printing area H2.

●Unused ink 94
A thin film of unused ink 94 that has not been used remains in the non-printing region H2.

● Scraping ink 97
In front of the squeegee 82 , the coat ink 98 scraped off by the squeegee 82 may deposit as scraped ink 97 . The scraped ink 97 is part of the coat ink 98 and is excess ink that has not been used for printing.
Since the squeegee 82 uses the coat ink 98 for the grooves 60 in the portion where the grooves 60 are present, the scraping ink 97 is less generated.
Since the squeegee 82 does not use the coat ink 98 in the grooves 60 in the portions without the grooves 60 , there is a possibility that the scraped ink 97 may be generated.
The scraped ink 97 is not actively generated, but is passively generated along with printing.
The amount of scraping ink 97 depends on the thickness of the coating ink 98 .
By adjusting the mounting height of the blade 84 to change the gap between the inner surface 54 and the blade 84, the amount of scraped ink 97 can be adjusted.
The width of the scraped ink 97 is the same as the width of the squeegee 82 .
The amount of scraping ink 97 is small and the scraping ink 97 does not flow behind the squeegee 82 from both ends of the squeegee 82 .

● Residual ink 96
After the squeegee 82 there is a print zone J that is depleted of the coated coat ink 98 .
The width of the print area J is the same as the width of the squeegee 82 .
The print area J may contain residual ink 96 that has not been used for printing.

● Dropping of residual ink 96 and unused ink 94 FIG.
Residual ink 96 is present inside the through-holes 66 , on the walls of the recesses 62 , and on the printing area J of the inner surface 54 of the annular screen plate 50 .
Furthermore, there is unused ink 94 in the non-printing area H2.
The residual ink 96 and the unused ink 94 go around once due to the rotation of the annular screen plate 50, but since the amount of ink is small and the ink 83 is viscous, the residual ink 96 and the unused ink 94 peel off from the inner surface 54 and fall. never

Dropping of outflowing ink The ink 83 does not flow out from the outer ends of the blade 84 behind the blade 84 as the outflowing ink. I have nothing to do. Furthermore, even if the outflowing ink were to peel off from the inner surface 54 and fall, it would fall outside the printing area J and be collected in the ink reservoir 99, so there would be no adverse effect.

●Restoration of wettability The residual ink 96 and the unused ink 94 dry during one rotation, but are restored to wet ink in the following manner.
1. Residual ink 96 and unused ink 94 on inner surface 54 absorb wettability from ink 83 in ink pool 99 by being covered by one ink pool 99 .
2. Residual ink 96 in through-holes 66 and recesses 62 absorbs wettability from filling ink 95 as ink 83 in ink reservoir 99 fills through-holes 66 and recesses 62 as filling ink 95 .
3. During rotation from the blade 84 to the squeegee 82, the residual ink 96 assimilates and integrates with the fill ink 95 and the unused ink 94 is covered by the coated coat ink 98 and assimilates and integrates with the coated ink. .
For this reason, the ink 83 is filled in advance, and the rotation waiting time T from the coating position Q to the printing position P is used to promote the recovery of wettability.

●Improvement of fillability Filling ink 95 flows into groove 60 through a plurality of through holes 66 .
The filling ink 95 passing through the through hole 66 has a columnar shape.
The columnar filling ink 95 that has flowed into the groove portion 60 becomes an ink lump according to the shape of the groove portion 60 .
A plurality of filling inks 95 passing through a plurality of through-holes 66 merge with adjacent filling inks 95 in the grooves 60 , and the merged inks transform into ink masses so as to fill the grooves 60 . Then, the columnar filling ink 95 that has passed through the through hole 66 is added to the ink mass to increase the volume of the ink mass.
It is considered that the coalescence of the filling ink 95 and the deformation of the filling ink 95 take time due to the viscosity of the ink.
Further, it is considered that it takes time to evenly fill the grooves 60 with the filling ink 95 without gaps.
For this reason, the ink 83 is filled in advance, and the rotation waiting time T from the coating position Q to the printing position P is used to promote improvement in filling the grooves 60 with the ink.

●Rotation waiting time T
Since the rotation waiting time T is the movement time of the screen 51 from the coating position Q to the printing position P, the rotation waiting time T is as follows.
Rotation waiting time T
= (arc length from coating position Q to printing position P/circumferential length) x time for one rotation = (central angle from coating position Q to printing position P/360 degrees) x time for one rotation = (mounting angle H /360 degrees) x time for one rotation = (mounting angle H/360 degrees) x (1/rotational speed)

If the rotation speed is 1/3 rotation/second and 20 degrees≦mounting angle H≦60 degrees, the rotation waiting time T is as follows.
Rotation waiting time T
= (20 degrees or more and 60 degrees or less/360 degrees) x Time for one rotation = (20 degrees or more and 60 degrees or less/360 degrees) x (1/(1/3 rotation/second))
= 1/6 seconds or more and 0.5 seconds or less

If the rotation speed is 1/3 rotation/second and 30 degrees≦mounting angle H≦45 degrees, the rotation waiting time T is as follows.
Rotation waiting time T
= (30 degrees or more and 45 degrees or less/360 degrees) x Time for one rotation = (30 degrees or more and 45 degrees or less/360 degrees) x (1/(1/3 rotation/second))
= 0.25 seconds or more and 0.375 seconds or less In this way, the blade 84 is arranged at the coating position Q where the rotation waiting time T for restoring the wettability of the residual ink 96 can be secured. The rotation waiting time T is preferably 1/6 second or longer and 0.5 second or shorter, and preferably 0.25 second or longer and 0.375 second or shorter.

●Comparative Example 1 (Ink pool 99 in front of squeegee 82)
If an ink pool 99 were formed in front of the squeegee 82 without the blade 84, the filling of the ink pool 99 with the ink 83 and the printing would be performed at the same time. , the presence of residual ink 96 will interfere with ink filling and extrusion.
Also, if the ink reservoir 99 is formed in front of the squeegee 82 without the blade 84, the filling of the ink reservoir 99 with the ink 83 and the printing are performed at the same time. There is a possibility that it will be printed in time. If the coalescence of the filling ink 95 and the deformation of the filling ink 95 are not in time, a gap or space is generated between the filling ink 95 and the groove portion 60, which hinders accurate printing.
Also, if the ink reservoir 99 is formed in front of the squeegee 82 without the blade 84, the amount of ink in the width direction of the ink reservoir 99 is not constant, so there is a possibility that the filling amount of the ink 83 will vary in the width direction. . By forming the ink pool 99 in front of the blade 84, the blade 84 coats the coat ink 98 with a uniform thickness, so that the supply amount of the ink 83 can be made uniform in the width direction during printing.

●Comparative Example 2 (Ink pools 99 both in front of the blade 84 and in front of the squeegee 82)
If the ink reservoir 99 is formed both in front of the blade 84 and in front of the squeegee 82, filling the ink reservoir 99 in front of the blade 84 with the ink 83 and filling the ink reservoir 99 in front of the squeegee 82 with the ink 83 are performed. will be performed, and there is a possibility that printing will be performed due to excessive ink.
In addition, if the ink reservoir 99 is formed both in front of the blade 84 and in front of the squeegee 82, the ink 83 in the ink reservoir 99 in front of the squeegee 82 will be absorbed after assimilation of the residual ink 96 and the filling ink 95 during the rotation waiting time. As a result, the possibility of printing due to excessive ink increases.

*** Features of Embodiment 1 ***
A rotary screen printing apparatus 100 according to Embodiment 1 is an apparatus that uses an annular screen printing plate 50 to print on a work.
The blade 84 is arranged at the coating position Q before the printing position P and coats the annular screen plate 50 with the ink 83 .
The squeegee 82 is arranged at the printing position P and pushes the ink 83 coated by the blade 84 from the inner surface 54 of the annular screen plate 50 toward the outer surface.
The rotary screen printing apparatus 100 prints with the ink reservoir 99 formed on the front surface of the blade 84 and the ink reservoir 99 not formed on the front surface of the squeegee 82 .
The up-down mechanism 71 moves the squeegee 82 and the blade 84 up and down (in the vertical direction) by the same distance at the same time.

*** Effect of Embodiment 1 ***
According to the rotary screen printing apparatus 100 of Embodiment 1, since printing can be performed with an appropriate amount of ink, accurate printing is possible.
For example, since the amount of ink in front of the squeegee 82 is uniform in the width direction, there is no difference in the amount of ink used for the three print lines 102, and the line widths of the three straight lines are uniform.
In addition, since the amount of ink in front of the squeegee 82 is even before and after the print line 102 (in the direction of the time axis), there is no difference in the amount of ink used for one print line 102 due to time. The line width becomes uniform at .

In addition, by filling the ink 83 in advance and using the rotation waiting time T from the coating position Q to the printing position P, it is possible to improve the fillability of the ink into the grooves 60 and the wettability of the ink.
In particular, when using a screen 51 having a different ink supply pattern (plurality of through holes 66) and a print pattern (grooves 60) on the workpiece, by filling the ink 83 in advance, the print pattern (grooves 60) can be filled with ink 83.
Alternatively, if the area or volume of the ink supply pattern (plurality of through holes 66) is smaller than the area or volume of the print pattern (groove 60) on the workpiece, filling the ink 83 in advance reduces the area or volume. Ink 83 can be filled in the print pattern (groove 60) having a large volume.
Further, when the print pattern (groove portion 60) on the workpiece is to print a continuous straight line pattern without a break like the print line 102, the ink 83 is filled in advance and the ink is united and deformed to form a continuous pattern without a break. Linear patterns can be printed.
In particular, when the print line 102 is wiring, printing without disconnection is essential, and the possibility of disconnection can be reduced by filling the ink 83 in advance.

The effects of the blade 84 of Embodiment 1 are as follows.
1. Since the blade 84 coats the ink 83, the amount of the ink 83 is optimized.
2. With a puddle 99 formed in front of the blade 84 and no puddle 99 formed in front of the squeegee 82, the amount of ink is optimized.
3. Since the width of the blade 84 is made larger than the width of the squeegee 82, the ink 83 in the ink reservoir 99 in front of the blade 84 does not flow around from both ends of the blade 84 and flow between the blade 84 and the squeegee 82.例文帳に追加Blade 84 blocks ink 83 in ink pool 99 from going between blade 84 and squeegee 82 .
4. Since the residual ink remaining on the inner surface 54 of the annular screen plate after printing is scraped off by the blade 84 and absorbed by the ink pool 99, a residual ink scraping member and scraping mechanism are not required.

***Another example of the blade 84 of the first embodiment***
FIG. 10 is a diagram showing a modification of the blade in Embodiment 1. FIG.
The blade 84 has an inclined surface 85 in front of the bottom surface and a parallel surface 86 parallel to the tangent line G behind the bottom surface.
Due to the presence of the inclined surface 85, more ink 83 can be embedded in the through-hole 66 than in the case of the parallel surface 86 only.
The parallel surface 86 allows the ink 83 on the inner surface 54 of the annular screen plate 50 to be scraped off.

***Another example of the blade 84 of the first embodiment***
FIG. 11 is a diagram showing a modification of the blade in Embodiment 1. FIG.
The blade 84 has a pair of wings 87 at both ends in the width direction.
The pair of feather portions 87 are arranged in an eight-letter shape or a V-letter shape outside the printed pattern.
The bottom surface of the wing portion 87 is arcuate along the inner surface 54 of the annular screen plate 50 .
The feathers 87 allow excess ink 83 on both sides of the blade 84 to be scraped toward the center of the printed pattern.
Because of the blade 87, the ink 83 in the ink reservoir 99 in front of the blade 84 does not flow around from both ends of the blade 84 and flow between the blade 84 and the squeegee 82.例文帳に追加
When the blade 87 is present, the ink 83 does not flow from both ends of the blade 84, so the coat angle E may be set to over 90 degrees. For example, 100 degrees≦coating angle E≦150 degrees may be satisfied.

***Another example of the blade 84 of the first embodiment***
FIG. 12 is a diagram showing a modification of the blade in Embodiment 1. FIG.
The blade 84 has the same width as the screen 51 .
Both end faces of the blade 84 are in contact with the inner side faces of the pair of end rings 59 .
Since the width of the blade 84 is the same as the width of the screen 51, the ink 83 in the ink reservoir 99 in front of the blade 84 does not flow around from both ends of the blade 84 and flow between the blade 84 and the squeegee 82.例文帳に追加
Since the ink 83 does not wrap around from both ends of the blade 84, the coat angle E may exceed 90 degrees. For example, 100 degrees≦coating angle E≦150 degrees may be satisfied.

***Another example of the blade 84 of the first embodiment***
FIG. 13 is a diagram showing a modification of the blade in Embodiment 1. FIG.
The blade 84 has an uneven surface or a wave surface.
The recess behind the blade 84 is where the groove 60 with the printed pattern is.
An ink reservoir 99 is formed in the recessed portion behind the blade 84 .

***Installation example of the blade 84 of the first embodiment***
14A and 14B are diagrams showing an example of attachment of the blade 84 according to Embodiment 1. FIG.
The position adjusting portion 91 and the angle adjusting portion 92 are attached to the horizontal column 74 .
The position adjustment unit 91 adjusts the vertical and horizontal positions of the blade 84 .
With the vertical position adjusting function of the position adjusting section 91, even if the vertical position of the squeegee 82 during printing is changed, the position of the blade 84 can be adjusted to an appropriate position.
The angle adjuster 92 adjusts the angle of the blade 84 with respect to the vertical direction.
The angle adjuster 92 can change the angle of the blade 84 within a maximum range of 90 degrees (K=90 degrees).
Even when the angle of the blade 84 is changed, the position of the blade 84 can be adjusted to an appropriate position by the up/down/left/right position adjustment function of the position adjustment unit 91 .
When the angle adjustment unit 92 rotates the blade 84 around the rotation center C to change the mounting angle H of the blade 84, vertical and horizontal position adjustment for angle adjustment is not required.

*** Mounting example of the cover 75 of the first embodiment ***
FIG. 15 is an attachment diagram of the cover 75 according to the first embodiment.
A cover 75 is fixed to the horizontal post 74 .
Cover 75 is a flat plate positioned between blade 84 and squeegee 82 .
The cover 75 is a flat plate placed between the pair of end rings 59 .
The cover 75 is a closed roof that covers the coating area H1 and prevents the coating ink 98 from drying.
Cover 75 is a protective roof that prevents dirt and dust from falling onto the surface of coat ink 98 .
Cover 75 may be fixed to the back of blade 84 instead of horizontal post 74 .
The cover 75 may be a curved plate instead of a flat plate, or may be a cylindrical partially curved plate around the center of rotation C.
Also, a cover 75 that covers the ink pool 99 may be provided in front of the blade 84 .

Embodiment 2.
Differences from the first embodiment will be described below.
FIG. 16 is a schematic perspective view of a rotary screen printer 100 for offset printing.
FIG. 17 is a schematic cross-sectional view of a rotary screen printer 100 for offset printing.

A rotary screen printer 100 has a blanket 300 .
The blanket 300 has a cylindrical shape with the same diameter as the annular screen plate 50 .
Blanket 300 is made of silicone.

A linear print pattern of the annular screen plate 50 is printed on the blanket 300 .
The straight printed pattern of blanket 300 is transferred to workpiece 101 as printed lines 102 .

Embodiment 3.
Differences from the first and second embodiments will be described below.
FIG. 18 shows the case of a belt-like or band-like annular screen plate 50 instead of a cylindrical screen plate.
Annular screen plate 50 does not have end rings 59 .
The annular screen plate 500 is rotated by a pair of conveying rollers 90 provided at both ends inside the annular screen plate 50 .

*** Supplementary explanation of the embodiment ***
Instead of the vertical mechanism 71 vertically moving the blade 84 and the squeegee 82 together, a vertical mechanism only for the squeegee 82 and a vertical mechanism only for the blade 84 may be separately provided.
The vertical column 73 may be eliminated and both ends of the horizontal column 74 may be moved up and down by a pair of cylinders 72 .
The horizontal post 74 may be eliminated and both ends of the blade 84 and the squeegee 82 may be fixed to a pair of upper and lower posts 73 .
The embodiments described above may be combined, or a part of the embodiments may be combined.

50 annular screen plate, 51 screen, 52 outer surface, 54 inner surface, 56 junction, 58 end, 59 end ring, 60 groove, 62 recess, 63 bottom surface, 66 through hole, 70 base, 71 vertical mechanism, 72 Cylinder, 73 Upper and lower pillars, 74 Horizontal pillars, 75 Cover, 78 Window, 82 Squeegee, 83 Ink, 84 Blade, 85 Inclined surface, 86 Parallel surface, 87 Wing part, 90 Conveying roller, 91 Position adjusting part, 92 Angle adjusting part C Rotation center, D: print angle, E: coat angle, F: tangent line, G: tangent line, H: installation angle, H1: coating area, H2: outside print area, J: print area, P: print position, Q: coat position, T: rotation waiting time.

Claims

In a rotary screen printing device that prints on a work using an annular screen plate,
a blade disposed in front of a printing position and coating the annular screen plate with ink in a state in which an ink pool is formed on the front surface;
a squeegee positioned at a printing position and printing with ink coated by said blade with no ink pool on the front surface.
the blade blocks ink in the ink pool from flowing behind the blade;
2. A rotary screen printing apparatus according to claim 1, wherein an ink pool is formed only in front of said blade.
The blade coats the ink while embedding the ink in the annular screen plate,
3. The rotary screen printing apparatus according to claim 1, wherein said squeegee prints only with ink embedded in said blade and ink coated with said blade.
The rotary screen printing device is
rotating the annular screen plate with the residual ink adhering to the inner surface of the annular screen plate without scraping off the residual ink remaining on the inner surface of the annular screen plate after printing with the squeegee;
4. The rotary screen printing apparatus according to any one of claims 1 to 3, wherein said blade collects said residual ink adhering to the inner surface of said annular screen plate in said ink reservoir.
The rotary screen printing apparatus according to any one of claims 1 to 4, comprising an up-down mechanism for moving the squeegee and the blade up and down by the same distance at the same time.
The rotary screen printing apparatus according to any one of claims 1 to 5, wherein the blades are arranged so as to intersect a tangent to the inner surface of the annular screen plate at right angles.
The rotary screen printing apparatus according to any one of claims 1 to 6, wherein the blade has an inclined surface in front of the bottom surface and a parallel surface behind the bottom surface.
The blade has feathers arranged in an eight-letter shape or a V-letter shape outside the printed pattern,
8. The rotary screen printing apparatus according to any one of claims 1 to 7, wherein the bottom surface of the wing portion is arcuate along the inner surface of the annular screen plate.
The rotary screen printing apparatus according to any one of claims 1 to 8, wherein the blade has the same width as the width of the screen of the annular screen plate.
The rotary screen printing apparatus according to any one of claims 1 to 9, wherein the blade has an uneven surface that forms an ink reservoir in the recessed portion.
a position adjusting unit that adjusts the position of the blade;
11. The rotary screen printing apparatus according to any one of claims 1 to 10, further comprising an angle adjuster that adjusts the angle of said blade.
The annular screen plate has a screen in which the ink supply pattern and the print pattern on the work are different,
12. A rotary screen printing apparatus according to any one of claims 1 to 11, wherein said blade fills said print pattern with ink.
The annular screen plate has a screen in which the area or volume of the ink supply pattern is smaller than the area or volume of the print pattern on the work,
13. A rotary screen printing apparatus according to any one of claims 1 to 12, wherein said blade fills said print pattern with ink.
In the rotary screen printing method for printing on a work using an annular screen plate,
Placing a blade in front of the printing position, forming an ink pool on the front surface of the blade,
Coating ink on the inner surface of the annular screen plate with the blade,
Placing a squeegee at the printing position, without forming an ink pool on the front surface of the squeegee,
A rotary screen printing method for printing with the squeegee.
15. The rotary screen printing method according to claim 14, wherein the blade coats the inner surface of the annular screen plate with the ink with a coating angle of more than 90 degrees.
16. The rotary screen printing method according to claim 14 or 15, wherein the blade is arranged at a coating position where a waiting time for rotation can be secured for remaining on the annular screen plate after printing to restore the wettability of residual ink.
The rotary screen printing method according to claim 16, wherein the rotation waiting time is 1/6 second or more and 0.5 second or less.