CN102267278A - Screen printing method and apparatus thereof - Google Patents

Abstract

The invention provides a screen printing method and an apparatus thereof, wherein the printing can be stably performed with good precision regardless of the area of the opening part of the printing mask. When printing mask of the opening part of a desired pattern is provided with a paste agent and then subject to transfer printing so as to facilitate the rolling of the paste agent, so that the filling property of the paste agent toward the opening part of the pattern is increased. In addition, a force on the paste agent is applied in the shape of a scraper plate in a direction perpendicular to the opening part of the printing mask so as to bear the scraper plate. By utilizing the printing apparatus, the paste agent is transferred from a printing mask with an opening part at a predetermined position to a printed article via the scraper plate. One corner of the front end of the scraper plate is arranged to be in an arc-shaped concave shape. The tapping angle between the scraper plate and the printing surface of the printed article is arranged to be smaller than the installation angle of the scraper plate, so that the printing can be better performed.

Description

Method for printing screen and device thereof

Technical field

The present invention relates to respect to be printed thing utilize scraper plate with the viscosity printing material via the mask to print of patterns of openings with regulation serigraphy at the printing process and the device thereof that are printed on the thing.

Background technology

So-called serigraphy, be a kind of of porous printing mode, to being printed on the thing, the wiring that serigraphy is applied to the IC substrate forms silk screen by scraping paste (print paste) that pressure (utilize scraper plate with paste (print paste) release) makes printing ink etc. thereby by having patterns of openings, (Flat Display Panel: pattern flat display panel) forms various purposes such as (electrode form and the fluorophor filling) to FDP with desirable pattern transfer.

Serigraphy for example also is applied to the printing at the soft soldering paste that was carried out before the actual installation operation of installation electronic unit on the printed circuit board.The soft soldering paste mixes the aqueous solder flux of Soldering Alloy powder and high viscosity (flux) and makes paste and obtain, and is transferred on the substrate via the mask to print of the patterns of openings with regulation.In this serigraphy, be widely used in good metal seal carving brush mask and the cockscombs in aspect such as mechanical strength.

Below, with regard to existing soft soldering printing, mask to print is called woven wire and scraper plate is called cockscomb describe.

Cockscomb is under the state of the angle of attack that makes its leading section with respect to the silk screen face tilt regulation of woven wire (for example 70 degree), on one side to supply with on the surface silk screen face that the soft soldering paste is arranged exert pressure (squeegee pressure) on print direction, slide on one side, thus, the pattern transfer that will form based on the soft soldering paste via the patterns of openings that is formed on the woven wire is to being printed on the thing.

On the printing surface of the printed circuit board that in soft soldering paste printing process, is imported, have concavo-convex about 20 μ m～80 μ m, this is concavo-convex to be that the solder resist (solder resist) implemented in the operation before this, electrode distribution etc. cause, therefore, the woven wire that the thickness that is made of stainless steel is about 100 μ m is boosted partly upward by the concavo-convex of these printed circuit boards when printing, thereby is formed with the gap between metal mask and printed circuit board.Therefore, during the protuberance of the woven wire that swells by protuberance when cockscomb, can produce the space by between, thereby become the reason that causes that printing is bad because of the printing surface of printed circuit board.

In order to prevent this situation, thereby cockscomb applied big squeegee pressure on one side print suppress above-mentioned space less on one side.Therefore, cockscomb is in the past made by the good special steel of wearability (superhard alloy), to improve its durability.In addition, solution as these situations, following record is arranged: at cockscomb and the leading section print direction opposition side in Japanese kokai publication hei 10-100374 communique (patent documentation 1), form the conical surface by etching, make it that strain take place easily, thus, even also can carry out stable printing, thereby reduced damage to the silk screen face of woven wire with less squeegee pressure.

Disclose following cockscomb in Japanese kokai publication hei 6-210829 communique (patent documentation 2): the friction when making slide relative with the silk screen face is a Min., by scraper plate leading section sphering (cross section is circular-arc) being formed the contact area that reduces with the silk screen face, thereby carry out stable printing, and can prevent that the silk screen face from damaging easily.But,, be considered to that this scraper plate leading section carries out mechanical grinding etc. by back processing and sphering forms though in above-mentioned communique, do not put down in writing its preparation method.

As the bad solution of the printing that causes because of the layer difference that is printed thing and the damage method of reductioning of woven wire, adopt the replacement cockscomb and use resinous scraper plate to carry out method of printing.

Below, just adopted the serigraphy of resinous scraper plate, mask to print is called mesh screen (mesh screen) and scraper plate is called the polyurethane scraper plate describe.

In polyurethane scraper plate in the past, flat scraper plate, square scraper plate, wedge angle scraper plate etc. are arranged.For example, as example in the past, what can list record in Japan's special fair 1-019275 communique (patent documentation 3) forms the scraper plate of tip-angled shape by the rubber mass elastomer.

Make angle of attack method of stabilizing as what concerning flat scraper plate, become problem, as Japan real open flat 3-055230 communique (patent documentation 4) put down in writing, proposed with the scraper plate that by polyurethane system rubber constitute of glass epoxy resin as supporting mass.This scraper plate is made of with the scraping plate part of fixing integratedly in the mode that covers this leading section at the leading section relative with base end part of this supporting mass the rack-mount supporting mass of base end part.Making the material of above-mentioned supporting mass is the glass epoxy resin system with elastic restoring force, and makes it be shaped as tabular.

In addition, its material of scraping plate part is a polyurethane rubber system, and the scraper plate the other end relative with the scraper plate leading section of scraping pressure is provided with the slot part that traverses width, and is fixed as one in the mode of the leading section of clamping supporting mass.

According to this example in the past, adopt the scraper plate of such structure, and be fixed on the support in its base end part side, thus, can on the silk screen face, scrape pressure.At this moment, if scrape pressure for a long time, even the leading section of scraping plate part changes (swelling) because of printing ink solvent, because the material of supporting mass is a glass epoxy resin system, therefore, the power of scraping slab integral can not change yet, and can stably scrape pressure.

In addition, as with glass epoxy resin improving one's methods as the scraper plate that constitutes by polyurethane system resin of supporting mass, in TOHKEMY 2005-319816 communique (patent documentation 5), following scraper plate has been proposed: make scraping plate part have thickness sufficient, thus, obtain in the scope of the side of scraping plate part and bottom, to form the scraper plate in tapering.

According to this example in the past, in order to set the angle of attack, by in the scope of the side of scraping plate part and bottom, implementing the angle grinding, thereby can form the tapering as target.Therefore, needn't carry out just can realizing the desirable angle of attack based on the angular adjustment that realizes to printing equipment installation scraper plate.

Have again, disclosing on Micro-tec Co., Ltd. homepage (non-patent literature 1): in the scope of the side of scraping plate part and bottom surface, implemented scraper plate (little scraper plate: registration mark) that the grinding of R shape forms.Though scraper plate is identical with the angle of attack between the printing surface, is processed into the R shape by scraping front edge of board, the paste in the time of can expecting to prevent to print is to the effect of scraper plate side arch.

As the metal mask that is used for serigraphy, the composite web type is arranged, that is: the configuration of the space in mask to print chase metallic plate is bearing in described metallic plate on the described mask to print chase via the tension web that is provided with along full week between this metallic plate and described mask to print chase with tensioning state.

This mask to print, thus plate-making formation mask to print uses in serigraphy on described metallic plate, and this mask to print is formed with the opening of the pattern of regulation in the printing effective coverage corresponding with the moving area that moves scraper plate thereon.

Use metal mask as follows: make the upper surface that is printed thing relative with the lower surface of metal mask, and scraper plate is slided on the upper surface of metal mask, thus, paste is filled in the peristome that is located on the metal mask, then, make to be printed thing disengaging metal mask, printing material is transferred to is printed on the thing.

On described metallic plate, in the printing effective coverage, form the opening of the pattern of regulation by methods such as Laser Processing, galvanoplastic, etching methods.

For example, form as follows by etching method: dual coating photoresist in the whole zone of described metallic plate (photo resist), and after the exposed mask that utilizes predetermined pattern carries out exposure-processed to this etchant resist, carry out etch processes.

In addition, silk screen print method is used for various printings, for example to electronic device, printed circuit board print electrode wiring, to base-board of liquid crystal display printing frame shape encapsulant, print dielectric layer, pixel separation wall, electrode wiring and fluorescent material etc. with substrate to plasma scope, with its purposes correspondingly design described mesh screen mask size, be the area of silk screen mesh screen, the size of mask to print chase and the width of tension web etc.

But along with the miniaturization of in recent years surface mounting assembly, the area of the pole plate of printed wiring board diminishes gradually, and with it together, the area of the peristome of mask to print also diminishes gradually.

Like this, at the little peristome of aperture area, if use scraper plate that patent documentation 1 put down in writing, promptly formed the cockscomb of the conical surface by etching, then the soft soldering paste is pressed into the power deficiency in the peristome of mask to print, therefore, engaging force deficiency between the soft soldering paste in the pole plate of printed wiring board and the peristome, consequently, produce following unfavorable condition sometimes: the soft soldering paste remains in the peristome of mask to print, the soft soldering paste can't print (transfer printing) to the pole plate of printed wiring board or realize the quantity not sufficient of the paste of printing.

It is generally acknowledged, compare with the rubber flap of polyurethane system, cockscomb the soft soldering paste is pressed in the peristome of mask to print power a little less than, can produce above-mentioned unfavorable condition.

In addition, usually, leading section at cockscomb requires high-precision flatness and flatness, but, above-mentioned cockscomb in the past, when producing, it carries out the retrofit of scraper plate leading section by spark machined etc., so there is the very high problem of cost owing to comprise blank (raw material).In addition, at the scraper plate leading section, for reduce frictional resistance go forward side by side line stabilization printing and implement that (Teflon: registration mark) by the coating processing of polytetrafluoroethylene (PTFE) of likewise known etc., this also is the reason that causes cockscomb expensive because of special teflon.

Have again, on the silk screen face of the woven wire of the slip effect that the cockscomb that bears by cemented carbide carries out with high squeegee pressure, damage bigger, especially remarkable at the protuberance from printed circuit board side protuberance as described above.That is, utilize cockscomb in the past to carry out stable printing, exist the big problem of damage of woven wire side.

Generally speaking, scraper plate is made of scraping plate part and the support installation portion that is installed on the scraper stent.The installation of the support installation portion by carrying out scraper plate, scraper stent is fixed scraper plate.Scraper stent has the angle of regulation with respect to printing surface.The setting angle to the printing machine pedestal of this scraper stent can be adjusted into desirable angle.

Scraping plate part is controlled, made this scraping plate part apply the squeegee pressure that is suitable for serigraphy to the silk screen mesh screen on one side, with the speed that is suitable for serigraphy along the surface of silk screen mesh screen move on one side.On the point that scraping plate part and silk screen mesh screen connect, be applied with squeegee pressure.At the point that scraping plate part and silk screen mesh screen connect, the silk screen mesh screen is pushed down to the surface that is printed thing, and the figure that is formed on the patterns of openings on the silk screen mesh screen is printed on the surface that is printed thing.Therefore, in order to carry out high-quality printing, the silk screen mesh screen is by silk screen frame equalization and balance stretches well and tensioning is very important.In addition, wish that scraper plate and silk screen carry out line and contact.In addition, the line of wishing the two contact is a straight line.

Scraper plate is connected on the printing surface with constant angles, and printing surface is applied squeegee pressure.Therefore, exist leading section bending to cause the angle (being called the angle of attack) between scraper plate and the printing surface can't keep the such unfavorable condition of constant angles owing to scraper plate.That is, in flat scraper plate in the past, there is the problem that the angle of attack changes in the printing.But, have under concavo-convex such situation being printed thing (for example above-mentioned printed circuit board), then have because the bending of flat scraper plate and can follow this concavo-convex advantage.

In flat scraper plate in the past, scraping plate part integral body has uniform elasticity, does not have power, therefore, thereby adopts metal to make the dimensionally stable of scraper plate to the support installation portion that is installed on the printing equipment, keeps power or hardness.In addition, because scraping plate part integral body has uniform elasticity, thereby existence is difficult to the angle of attack is kept constant shortcoming.

In addition, in square scraper plate and wedge angle scraper plate in the past, exist the linear problem that to carry out mechanical grinding, be difficult to obtain the bearing surface of printing surface and scraper plate.

In addition, utilize the scraper plate of record in patent documentation 4 and the patent documentation 5, promptly with the scraper plate that by polyurethane system resin constitute of glass epoxy resin as supporting mass, though can be suppressed at the bending that becomes the integral body of problem in the flat scraper plate, but because when printing soft soldering paste arches up on the side of scraper plate, so power deficiency that the soft soldering paste is pressed in the peristome of mask to print, the zygosity of the soft soldering paste in the pole plate of printed wiring board and the peristome is insufficient, consequently, exist the soft soldering paste to remain in the peristome of mask to print, the soft soldering paste can't print (transfer printing) to the pole plate of printed wiring board, or the unfavorable condition of the quantity not sufficient of the paste that prints.

Generally speaking, utilize the serigraphy of mesh screen mask different, before printing, need carry out applying (silk screen face side) on the mask to print based on the paste of scraper (scraper) based on scraper plate with the serigraphy that utilizes metal mask.That is, apply paste and utilize the mesh screen in the peristome that is present in mask to print (mesh screen mask) to keep paste, thereby can when the printing of carrying out based on scraper plate, increase the discharge rate of paste.On the contrary, because there are not the parts that remain in the pattern openings portion in metal mask, so can't on mask to print, apply paste.

Under the situation of using metal mask, owing to finish printing by the action of a direction, so, compare with the mesh screen mask that needs paste to apply, can shorten the time that the printshop consumes.

As the mesh screen mask, at mask to print and be printed and be provided with slit (gap) between the thing, can almost side by side carry out from version with printing.

On the other hand, as metal mask, owing to make mask to print and be printed that thing is tight to be contacted and slit (gap) is not set, so after printing, need to carry out from version operation (make mask to print and be printed the operation that thing separates).

Therefore, even use the mesh screen mask, it also is important similarly finishing printing by the action of a direction with metal mask.There is following problem: realize a kind ofly can satisfying simultaneously for improving the paste that carries out to the filling of the patterns of openings of mask to print and apply and carry out scraping front edge of board from the structure of mask to print to the function of the printing of the transfer printing that is printed thing for this reason.

In addition, since generally speaking paste because of applying shearings (shear strength) good fluidity, so by rolling, viscosity reduces and the flowability raising.Also there is following problem: thus printing (filling, transfer printing) improved with the rollability of utilizing scraper plate to print side by side, improve paste.

Have again, when utilizing scraper plate printing paste since paste along with the scraper plate side arch of mask to print opposition side, so also be a problem to the paste insufficient fill of mask to print.

Problem is to find to have concurrently the structure of scraping front edge of board of the advantage that can solve such problem.

In addition, since paste by the leading section of scraper plate to the patterns of openings filling that is formed on the mask to print, so the shape of the leading section of scraper plate can have influence on the paste filling to mask to print, therefore, problem is to realize making the scraper plate front-end structure of filling ratio scraper plate raising in the past.Particularly, owing to can change the direction that is applied to the power on the paste, so problem is that direction from approximate vertical is to the patterns of openings filling paste that is formed on the mask to print by the front end of scraper plate and the angle of attack that is printed between the thing.

On the other hand, owing to the load that on scraper plate, is applied with based on squeegee pressure, so leading section can be out of shape.As mentioned above, because the flat scraper plate of polyurethane system bends on the whole, become very little so scrape the angle of attack of front edge of board, this angle of attack can change because of the layer difference that is printed thing.If angle of attack change, then the filling to the peristome of mask to print changes, so problem is to reduce the inequality of filling.

According to the difference of printing object thing, mask to print is distinguished use metal mask, mesh screen mask etc.Problem is, realizes the printing equipment that no matter at which kind of mask to print can both tackle.In addition, as mask to print, problem is paste stably is transferred to desirable amount and is printed on the thing.

Have again, according to the difference of printing object thing, employed paste difference.Paste is the high viscosity substance that solid constituent and liquid component are mixed, problem is, can use particle that its solid constituent forms with slicken solder, silver particles, flakey silver particles according to purpose, with nickel as the particle of main component, by the paste of at least a material in plated resin particle, ceramic particle, the glass particle as main component.

Summary of the invention

The present invention makes just in view of the above problems, its purpose is to provide a kind of printing equipment, this printing equipment can carry scraper plate, and this scraper plate can irrespectively well and stably be printed on soft soldering paste precision on the printed wiring board with the size of the aperture area of the peristome of mask to print.Promptly, the invention provides a kind of printing process and device thereof, can carry following scraper plate: this scraper plate leading section is processed, so that the time to the mask to print filling with desirable peristome, transfer printing paste, promote the rolling of paste, and promote the filling of paste to the peristome of mask to print, and, on peristome vertical direction, paste is applied power with respect to mask to print.

Below, the summary of representational embodiment in the disclosed invention of the application is carried out simple declaration.

The installation of scraper plate comprises makes scraper plate to the direction opposite with printing process situation about tilting and the situation that scraper plate is tilted to print direction.Make scraper plate under the situation that the direction opposite with print direction tilts, the direction of the scraper plate face that paste contacted is vertical in fact with the setting angle of scraper plate.On the other hand, make scraper plate under the situation that print direction tilts, the direction of the scraper plate face that paste contacted is identical in fact with the setting angle of scraper plate.

No matter scraper plate is any installation method, utilizing scraper plate from the mask to print that has peristome at assigned position paste to be transferred to the printing equipment on the assigned position that is printed thing that is fixed on the platform, have following feature: an angle of scraping front edge of board has circular-arc concave shape, forms the scraper plate and the described angle of attack that is printed the printing surface of thing littler than the setting angle of scraper plate.

Thus, paste is scraped in the circular-arc concave shape portion of front edge of board by inclosure, in the operation of scraping pressure (scraper plate on one side the silk screen face of mask to print is exerted pressure (squeegee pressure) slide) on one side on print direction, paste can roll along the circular-arc concave shape of scraping front edge of board.

If reduce the angle of attack and reduce the setting angle of scraper plate, then apply squeegee pressure scraper head shell and scrape between the position of front edge of board and contact print mask relative position skew can take place, can't apply squeegee pressure to the scraper plate leading section effectively.That is, if at force place relative position skew takes place the turning moment effect is arranged then, in this case, squeegee pressure is high more, can act on more and the rightabout power of squeegee pressure scraping front edge of board.

Therefore, expectation is same direction to direction and the scraper plate leading section and contact point mask to print that scraper head applies squeegee pressure.

Have following feature: the side at the concave shape of scraper plate nose circle arcuation is contacted with under the state of mask to print, scrape the opposing party of circular-arc concave shape of front edge of board and more than 10 times of average grain diameter that the gap between the mask to print is employed paste, and be below the 1mm.What is called is scraped the opposing party of the circular-arc concave shape of front edge of board, is the leading section of scraping the circular-arc concave shape of being processed into of front edge of board and not contacting with mask to print.

The size of the particle of the solids that contains in gap between this leading section and the mask to print and the employed paste is relevant.If scraper plate contacts with mask to print, then not only paste can be filled in the peristome of mask to print, what also paste can be discharged to mask to print is printed the thing side.Then, because the front end of the scraper plate that originally is used to print arrives the peristome of mask to print, thereby can produce the situation of secondary printing.

With to the patterns of openings portion filling paste of mask to print similarly, with respect to the particle diameter of the solid constituent in the paste, patterns of openings portion need be the size more than at least 10 times.Less than above-mentioned size, then can hinder the flowability of paste in patterns of openings portion, in patterns of openings portion the obstruction that causes because of the particle in the paste take place, thereby paste is seen through well.Therefore, the gap sky between scraper plate and the mask to print need be split into the gap more than 10 times of the average grain diameter that is employed paste at least.

On the other hand, if the gap between scraper plate and the mask to print is vacated more than the 1mm, then paste can't be enclosed and scrape in the circular-arc concave shape portion of front edge of board, thus open to the paste applied pressure, become the reason a little less than the filling power of the patterns of openings portion of mask to print.Therefore, the gap of wishing scraper plate and mask to print is below the 1mm.

The gap of scraper plate and mask to print is more little, and the power that paste is applied is big more, can improve the filling to the patterns of openings portion of mask to print.

Be processed into special shape by the scraper plate fore-end that will contact with mask to print like this, can have on mask to print with the thickness of ormal weight apply paste function, make the function in function that paste rolls and the peristome that paste is filled to mask to print.

At this, have following feature: the material of employed scraper plate is that main component is the resin of polyurethane, and its hardness is more than 80 degree.If hardness is low, use as supporting member even then will suppress the supporting mass of the distortion of scraper plate, scrape front edge of board and also can be out of shape by the squeegee pressure when printing, cause the angle of attack instability between scraper plate and the printing surface.

If cockscomb, though then can make the very high scraper plate of hardness, it is concavo-convex that the solder resist of implementing in the operation before having therefore on the printing surface of printed circuit board, electrode distribution etc. cause, to the front end requirement flexibility of scraper plate.

In addition, in printing process of the present invention and device thereof, as mask to print, can use with metallic plate with the peristome that comprises regulation mask to print (metal mask) as feature, can also use with the object plane side that is printed to have the mask to print of organic matter layer as feature at this metallic plate.

In addition, in printing process of the present invention and device thereof,, can use with pattern and form the zone at least by comprising that wire-mesh screen and organic emulsion constitute and emulsion has the mask to print (mesh screen mask) of the peristome of regulation as feature as mask to print.

As printing process of the present invention and install employed mask to print, be not limited to metal mask, mesh screen mask in this explanation etc.

According to printing process of the present invention and device thereof, can with the size of the aperture area of the peristome of mask to print irrespectively precision well and stably print paste.

These technical characterictics and advantage of the present invention will obtain clearly by following detailed description to preferred implementation of the present invention shown in the drawings.

Description of drawings

Fig. 1 is the block diagram that the summary of the printing equipment of expression embodiment 1 constitutes.

Fig. 2 is that expression utilizes the printing equipment of embodiment 1 to carry out the flow chart of flow process of the processing of serigraphy.

Fig. 3 A is the side view that the scraping plate mechanism that the summary of the scraping plate mechanism on the printing equipment of embodiment 1 constitutes is carried in expression.

Fig. 3 B is figure when utilize carrying scraping plate mechanism on the printing equipment of embodiment 1 and carry out serigraphy, that scraper plate describes with respect to the state that flows of the soft soldering paste of the action of mask and scraper plate leading section office.

Fig. 3 C is the figure that the state that flows of soft soldering paste when the scraping plate mechanism of utilization lift-launch on the printing equipment of embodiment 1 carried out serigraphy, scraper plate leading section office describes.

Fig. 4 is the side view of the scraping plate mechanism that constitutes of the summary of a pair of scraping plate mechanism that uses among the expression embodiment 1.

Fig. 5 is the enlarged drawing of the fore-end of the scraping plate mechanism of use among the embodiment 1.

Fig. 6 is the various skeleton diagrams of scraping the front edge of board shape that are used for evaluation experimental among the embodiment 1.

Fig. 7 is the side view of the scraping plate mechanism that constitutes of the summary of the scraping plate mechanism that uses among the expression embodiment 3, be used to illustrate the front end shape scraping plate mechanism want portion's enlarged drawing.

Fig. 8 is the various skeleton diagrams of scraping the front edge of board shape that are used for evaluation experimental among the embodiment 3.

Fig. 9 is the enlarged drawing of the fore-end of the scraping plate mechanism of use among the embodiment 3.

The explanation of Reference numeral

1,71 scraper plates

3,73 scraper stents

5 mask to print surfaces

6 are printed thing

8, the 78 circular-arc concave shape portions of scraping front edge of board

9 soft soldering paste

11 mask to print

21 control panels

22 chases

23 are printed thing supporting station portion

100 printing equipments

110 mask to print portions

120L, 120R scraping plate part

130 scraper plate driving mechanism portions

The specific embodiment

In the following embodiments, exist in case of necessity for convenience, be divided into more piece or a plurality of embodiment describes, but, except that situation about expressing especially, these contents are not irrelevant each other, but a side is the opposing party's part or all the relation of variation, detailed description, supplementary notes etc.

In addition, in the following embodiments, under (comprising number, numerical value, amount, scope etc.) situations such as the quantity of mentioning key element, except that situation about expressing especially and on principle, be defined as significantly the situation etc. of specific quantity, be not defined as this specific quantity, more than specific quantity or followingly all can.

At the institute's drawings attached that is used for illustrating present embodiment, the parts with identical function are marked identical Reference numeral, and omit the explanation of its repetition in principle.Below, describe embodiments of the present invention with reference to the accompanying drawings in detail.

(embodiment 1)

Utilize Fig. 1 that the formation of the printing equipment 100 of embodiment 1 is described.Fig. 1 is the front view of the printing equipment 100 of present embodiment 1.For the purpose of simplifying, among Fig. 1, omitted the expression of pallet to device, sidewall, pillar, support unit etc.

Printing equipment 100 has mask to print portion 110, is printed thing supporting station portion 23, a pair of scraping plate part 120L and 120R, scraper plate driving mechanism portion 130 and control part 21.

Mask to print portion 110 constitutes to have: the metal mask 11 that is provided with and is printed the pattern openings portion that the desired circuit pattern of thing (for example printed circuit board) 6 wears accordingly; The chase 22 overlooked that keeps tensioning state by the tension web of surrounding metal mask 11 for rectangular shape; Support unit 111 with this chase of supporting.Be printed thing supporting station portion 23 have mounting be printed the platform 231 of thing 6, to being positioned in the drive division up and down 233 that is printed chuck segment 232 that thing 6 fixes, platform 231 is driven up and down on the platform 231.

Scraping plate part 120L has scraper plate 1L, scraper stent 3L, scraper stent stationary fixture 16L, scraper head 15L and cylinder 24L.Scraping plate part 120R has scraper plate 1R, scraper stent 3R, scraper stent stationary fixture 16R, scraper head 15R and cylinder 24R similarly.Cylinder 24L and 24R are fixed on the support unit 25, to driving up and down with scraping plate part 120L and the scraping plate part 120R that cylinder 24L is connected with 24R respectively.In addition, support unit 25 supports by 26L of bearing portion and the 26R that engages with driving shaft 27.

Driving shaft 27 is made of ball-screw, be driven in rotation by motor 30, thus, 26L of bearing portion that engages with driving shaft 27 and 26R move up at the right and left of figure, and scraping plate part 120L and scraping plate part 120R move up along the right and left of the axis of guide 28 at figure.The driving shaft 27 and the axis of guide 28 are by pair of right and left fixed head 29L and 29R supporting.

The action of each one of control part 21 control printing equipments 100.At first, the air cylinder driven portion 31 that drives a pair of cylinder 24L and 24R is controlled, drive a pair of cylinder 24L and 24R thus respectively by control signal from control part 21.In addition, thus by the drive division 32 of motor 30 being controlled motor 30 is rotated to both forward and reverse directions from the control signal of control part 21.In addition, the chuck drive portion 34 that driving is printed the chuck segment 232 of thing supporting station portion 23 is controlled, the chuck segment 232 that thing 6 fixes that is printed that is positioned on the platform 231 is carried out on-off action thereby make by control signal from control part 21.In addition, by control signal the platform control part 33 that driving is printed the drive division up and down 232 of thing supporting station portion 23 is controlled, thereby platform 231 is moved up and down from control part 21.In addition, by the drive division 34 of the chuck 232 that is printed thing supporting station portion 23 being controlled, thereby carry out the switching of chuck 232 from the control signal of control part 21.

The flow chart that utilizes Fig. 2 describes the action of printing equipment with above formation.At first, be printed thing 6 and it is positioned in by the carrying of not shown carrying mechanism and be printed in the thing supporting station portion 23 (S201), and utilize chuck segment 232 will be printed thing 6 to be fixed and held at and to be printed in the thing supporting station portion 23.Next, thus utilize 32 pairs of platform drive divisions up and down drive division 233 drive platform 231 risen (S202), make to be printed thing 6 and closely to contact with the metal mask 11 of mask to print portion 110.Then, scraper head 15L is descended (S203), make scraper plate 1L closely contact (S204) with metal mask 11 thereby utilize air cylinder driven portion 31 to drive cylinder 24L.At this moment, a pair of scraping plate part 120L and 120R are positioned at the left end portion of Fig. 1.

Then, under this state, the soft soldering paste is supplied to (S205) near the scraper plate 1L by not shown soft soldering paste feed mechanism.After having supplied with the soft soldering paste, to driving shaft 27 rotations that drive division 32 is controlled and drive motor 30 and making is made of ball-screw, thus, the scraper plate 1L that makes a pair of scraping plate part 120L and 120R and be installed in its front end moves from the left side of Fig. 1 to the right at the state lower edge metal mask 11 of pushing and pressing on metal mask 11, thereby the pattern of the metal mask 11 that will form based on the soft soldering paste is printed onto and is printed (S206) on the thing 6.

Moved the distance of regulation as scraper plate 1L after, drive division 32 stops the driving of motor 30 and the mobile of scraper plate 1L is stopped.Next, scraper head 15L is risen (S207), scraper plate 1L is drawn back from metal mask 11 thereby drive by 31 couples of cylinder 24L of air cylinder driven portion.Then, thus by 33 pairs of platform drive divisions up and down drive division 233 control platform 231 descended (S208), and will peel off from metal mask 11 by the thing 6 that is printed that chuck segment 232 keeps.

After platform 231 arrives the end that descends, stop based on the processing of the platform 231 of drive division 233 up and down, it is open that control chuck drive division 34 and will keeping is printed the chuck segment 232 of thing 6, and will be printed thing 6 by not shown operating mechanism and take off (S209) from platform 231.Whether the substrate of judging this taking-up is pending last substrate (S210), if last substrate end process then.

On the other hand, existing under the situation of substrate to be processed next, carry out the handling process that begins from S201 once more.But, in this case, in S203, scraper head 15R is descended, in S204, S206, S207, carry out scraper plate 1L is replaced into the processing of 1R.In addition, thus make that the scraper plate 1R that closely contacts with metal mask 11 are mobile to the left from the right side of Fig. 1 to carry out serigraphy.Be used alternatingly scraper plate 1L and 1R like this and carry out serigraphy, thus, the soft soldering paste that is supplied to is positioned at the place ahead all the time with respect to the direct of travel of the scraper plate that closely contacts with metal mask, can use the soft soldering paste effectively.

Next, the formation about a pair of scraping plate part 120L and 120R describes several object lessons.

At first, utilize first example of the structure of Fig. 3 A explanation scraping plate part 120L.In addition, the structure of scraping plate part 120R is and scraping plate part 120L symmetry, is identical formation basically.Scraper plate 1L with respect to print direction 2 to the mode that tilts in the other direction, be fixed on the scraper stent 3L by scraper stent pressing plate 4L.Be provided with scraper plate installed surface 7L on scraper stent 3L, this scraper plate installed surface 7L is used for supporting scraper plate 1L with respect to mask to print surface 5, the thing bearing-surface (upper surface) that is printed that is printed the printing surface of thing 6 or is printed thing supporting station (Fig. 1 231) obliquely with predetermined angular.On scraper plate 1L, on its leading section and angle that mask to print (metal mask) 11 contacts, be formed with the circular-arc 8L of concave shape portion.

During printing, soft soldering paste 9 at first with in essence contacts with the initial contact-making surface 10L of paste of the vertical scraper plate of the angle of the installed surface 7L of scraper plate 1L, with the soft soldering paste is coated on the metal mask 11 side by side, soft soldering paste 9 is inserted in the mask to print peristome 12 that is formed on the metal mask 11.And, by the circular-arc 8L of concave shape portion that scrapes front edge of board soft soldering paste 9 is rolled, soft soldering paste 9 is filled with via the pattern openings portion 12 that is formed on the mask to print on the metal mask 11, is printed electrode pad 13 on the thing up to arrival.Be printed on the thing 6, the part beyond the predetermined pattern opening of electrode pad 13 covered by solder resist 14.

Utilize Fig. 3 B and Fig. 3 C that soft soldering paste 9 is rolled because of the circular-arc 8L of concave shape portion of scraper plate 1L front end and arrive the situation that is printed the electrode pad 14 on the thing 6 and at length describe via the pattern openings portion 12 of mask to print.

At first, utilize Fig. 3 B, Yi Bian on one side with scraper plate 1L pushing and pressing make it on the metal mask 11 when the direction of arrow 2 moves, soft soldering paste 9 is filled to situation on the electrode pad 13 that is printed on the thing 6 with (a)～(e) list chronologically and schematically describe from the circular-arc 8L of concave shape portion that scrapes front edge of board via the pattern openings portion 12 that is formed on the mask to print on the metal mask 11.

(a) the circular-arc concave shape portion 8L no show still of expression scraper plate 1L front end is formed on pattern openings portion 12 state before of the mask to print on the metal mask 11.When the bight 81L of scraper plate 1L front end moves to the direction of arrow 2 with the state that is pushed on the surface 5 that is against metal mask 11, then being fed into soft soldering paste 9 on the direct of travel front surface of scraper plate 1L is being pushed away with scraper plate 1L by the initial contact-making surface 10L of the paste of scraper plate 1L and is moving to identical direction, the part of this soft soldering paste 9 is from inboard (1) that the bight 82L and the clearance G between the metal mask 11 of the front end of the circular-arc 8L of concave shape portion of scraper plate 1L front end enters the circular-arc 8L of concave shape portion, bump against the bight 81L of the front end that is pushed the scraper plate 1L on the surface 5 that is against metal mask 11 and keep out of the way (2) upward, and then be pushed out (3) from clearance G to the initial contact-making surface 10L of the paste of scraper plate 1L side along the upper surface of the circular-arc 8L of concave shape portion.

When scraper plate 1L is advanced further and as (b) shown in, when the bight 82L arrival of the front end of the circular-arc 8L of concave shape portion of scraper plate 1L front end is formed on the top of pattern openings portion 12 of the mask to print on the metal mask 11 along the direction of arrow, be pushed into the pattern openings portion 12 of mask to print (4) to the part of the soft soldering paste that the initial contact-making surface 10L of the paste of scraper plate 1L side is pushed out along the upper surface of the circular-arc 8L of concave shape portion from clearance G.

When scraper plate 1L is advanced further also shown in (c) along the direction of arrow, when the circular-arc 8L of concave shape portion of scraper plate 1L front end arrives the top of the pattern openings portion 12 that is formed on the mask to print on the metal mask 11, no longer act on the soft soldering paste be pushed into power in the pattern openings portion 12 of mask to print, but with the state of (a) in the same manner, upper surface from the soft soldering paste 9 of the bight 82L of the front end of the circular-arc 8L of concave shape portion of scraper plate 1L front end and the inboard that the clearance G between the metal mask 11 enters the circular-arc 8L of concave shape portion along the circular-arc 8L of concave shape portion is pushed out (3) from clearance G to the initial contact-making surface 10L of the paste of scraper plate 1L side.

When scraper plate 1L is advanced further and as (d) shown in, when being pushed the top of pattern openings portion 12 of bight 81L arrival mask to print of the circular-arc 8L of concave shape portion of the scraper plate 1L front end that is against on the metal mask 11 along the direction of arrow, a part that bumps against the soft soldering paste of bight 81L in the inside of the circular-arc 8L of concave shape portion is pushed in the pattern openings portion 12 of mask to print (5), remainder is kept out of the way (2) upward, is pushed out (3) from clearance G to the initial contact-making surface 10L of the paste of scraper plate 1L side along the upper surface of the circular-arc 8L of concave shape portion.

When scraper plate 1L along the direction of arrow be advanced further and as (e) shown in, the bight 81L of the circular-arc 8L of concave shape portion of scraper plate 1L front end surmounts the pattern openings portion 12 of mask to print, then based on pattern openings portion 12 and the serigraphy that realizes end.

Utilize the state of the inside of the pattern openings portion 12 that Fig. 3 C illustrates in greater detail in (b) of Fig. 3 B, the soft soldering paste is pushed into mask to print in the rolling of the inside of the circular-arc 8L of concave shape portion, its part herein.

In Fig. 3 C, represent that with arrow the relative position of soft soldering paste 9 and scraper plate 1L at the circular-arc concave shape portion 8L place of scraper plate 1L front end changes.In addition, in Fig. 3 C, (1)～(5 of putting down in writing among (1) that arrow marked～(7) of the motion of expression soft soldering paste 9 and Fig. 3 B) do not have direct relation.

Driven by scraper plate driving mechanism 130 and when the direction of arrow 2 is advanced when the edge part 81L of the lower end of scraper plate 1L is being pushed under the state that is against on the metal mask 11, the soft soldering paste 9 in the place ahead that is fed into scraper plate 1L is from the position of (1), through being formed on recess 8L's and metal mask 11 contact side opposition sides end 82L and the clearance G between the metal mask 11 on the scraper plate 1L, entering into the inside (2) of recess 8L.

If scraper plate 1L further advances to the direction of arrow 2, the soft soldering paste 9 of inside that then enters into recess 8L and is pushed back (4) to opposite direction because the end 81L of recess 8L and metal mask 11 come in contact and boosted (3) upward by end 81L.If scraper plate 1L further advances to arrow 2 directions, then soft soldering paste 9 along the wall of recess 8L to being directed downwards of end 82L mobile (5), and further flow downward at the leading section of end 82L, its part is pushed into the inside (6) of the peristome 12 that is formed on the metal mask 11, thus, the inside of peristome 12 is by 9 fillings of soft soldering paste, and is connected with electrode pad 13 on being printed thing 6.

The soft soldering paste 9 that does not thoroughly enter peristome 12 is discharged to the initial contact-making surface 10L of the paste side (7) of scraper plate from the clearance G between end 82L and the metal mask 11.That is, the soft soldering paste 9 that has entered the inside of recess 8L rolls in the inside of recess 8L and is discharged to the outside of recess 8L once more.

Like this, when scraper plate 1L when the direction of arrow 2 is advanced, roll in the inside of recess 8L and clearance G between end 82L and metal mask 11 when being discharged to the outside of recess 8L from the soft soldering paste 9 of the inside that the end 82L that is formed on the recess 8L on the scraper plate 1L and the clearance G between the metal mask 11 enter into recess 8L, its part is owing to the inside that is pushed into the peristome 12 that is formed on the metal mask 11, so the soft soldering paste is fills up to the inside of peristome 12 reliably.

The mask to print 110 that is used for printing is following composite web type mask to print: metallic plate 11 is configured in space in the mask to print chase 22, via the tension web (not shown) along full week setting between this metallic plate 11 and described mask to print chase 22 described metallic plate 11 is bearing in tensioning state on the described mask to print chase 22.

In this mask to print 110, on described metallic plate 11, with the corresponding printing of the moving area effective coverage of the scraper plate 1L that moves thereon in form the opening 12 of predetermined pattern, make a plate and be used for printing.

Utilize Fig. 4 that the scraping plate mechanism that carries on the printing equipment 100 of present embodiment 1 is described.As shown in Figure 3A, the scraper stent 3L that scraper plate 1L is fixed is fixed on the scraper head 15L, and independent with it paired another scraper head 15R that moves is provided with in relative mode.As scraper head 15L and 15R, for the angle of attack of the surface 5 that obtains metal mask 11 and the regulation between scraper plate 1L and the 1R and utilize scraper stent setting angle setting clamp 20L and 20R to come set angle, and scraper stent 3L and 3R are fixed by scraper stent stationary fixture 16L and 16R.

Scraper plate front-end structure for the printing equipment 100 of present embodiment 1 is carried is example and utilizes Fig. 5 to describe with scraper plate 1L.Scraper plate 1L is installed on the scraper stent 3L (with reference to Fig. 3) with established angle 17 (with respect to the angle of horizontal direction).In present embodiment 1, the established angle 17 to scraper stent 3L of scraper plate 1L is 35 °.At the leading section of scraper plate 1L, with bight 81 that mask to print 11 contacts on be formed with the circular-arc 8L of concave shape portion.This circular-arc 8L of concave shape portion forms in the following manner: when under the state that is installed in established angle 17 at scraper plate 1L on the scraper stent 3L bight 81 being contacted with mask to print 11, produce clearance G between the surface 5 of the other end 82L of the circular-arc 8L of concave shape portion and mask to print 11.

For as utilize Fig. 3 B and Fig. 3 C illustrated, when the clearance G between the surface 5 of the other end 82L of the soft soldering paste 9 that rolls in the inside of the circular-arc 8L of concave shape portion by the circular-arc 8L of concave shape portion and mask to print 11 is discharged to the initial contact-making surface 10L of the soft soldering paste side of scraper plate 1L, on scraper plate 1L, produce pushing force, it is downward mobile that soft soldering paste 9 is produced.For this reason, as the condition of the other end 82L of the circular-arc 8L of concave shape portion, as long as be that the modes of the value of the scopes spent of 5 degree～80 form the circular-arc 8L of concave shape portion with respect to the angle θ L on the surface 5 of metal mask 11 with the tangent line of the circular-arc 8L of concave shape portion at the other end 82L place shown in Fig. 5 (b).

The initial contact-making surface 10L of paste of vertical with the angle to the setting angle 17L of scraper stent 3L of scraper plate 1L in essence scraper plate and mask to print surface 5 (scraper plate contact-making surface), the angle that is printed thing 6 bearing-surfaces that is printed the printing surface of thing 6 or is printed thing supporting station 231 are the initial contact-making surface of paste angle 18L.In present embodiment 1, the initial contact-making surface of paste angle 18L is 55 °.

On the other hand, at scraper plate 1L and mask to print 11 position contacting 81L, the scraper plate contact-making surface angulation on scraper plate 1L and mask to print surface 5 is angle of attack 19L.In present embodiment 1, change angle of attack 19L and verify printed state.

Utilize the initial contact-making surface of paste angle 18L, can with on the surface 5 of mask to print 11, apply soft soldering paste 9 side by side, soft soldering paste 9 is inserted in the pattern openings portion 12 that is formed on the mask to print 11.And, inboard at the circular-arc 8L of concave shape portion of the front end of scraper plate 1L, soft soldering paste 9 rolls forcibly, with respect to the pattern openings portion 12 on the mask to print 11 of being formed on vertical direction to the soft soldering paste application of force, thereby can with angle of attack 19L via being formed on pattern openings portion on the mask to print 11 filling soft soldering paste 9, arrive the electrode pad 13 that is printed on the thing 6 until soft soldering paste 9.

The scraper plate 1L of present embodiment is characterised in that: the front end at scraper plate 1L has the circular-arc 8L of concave shape portion, and angle of attack 19L is littler than the initial contact-making surface of paste angle 18L.In addition, by scraper plate 1R similarly is provided with the circular-arc 8R of concave shape portion at front end, can obtain the effect same thus with scraper plate 1L.

As the soft soldering paste that in the confirmatory experiment of embodiment 1, uses, utilize (A): the LF-204-15 (particle diameter of Tamura Chemical Research Co., Ltd.'s system, semiconductor particles: 1～12 μ m) reach (B): the M705-BPS7-T1J (particle diameter of Senju Metal Industry Co., Ltd's system, semiconductor particles: 1～6 μ m), and use with the scraper plate of polyurethane as the resin of main component, as mask to print 11, use is that to form diameter on the metallic plate of 70 μ m be the metal mask that the pattern openings portion 12 of 50 μ m～200 μ m forms at thickness, carries out serigraphy.

Scraper plate 1 is tilted to the direction opposite with print direction, and the scraper stent established angle of scraper plate 1 is 35 °, and the initial contact-making surface of paste angle 18 (scraper plate takes the lead in contacting the angle of direction of the scraper plate face of paste) is 55 °.

In addition, as the scraper plate that is used to verify, use with the resin of polyurethane as main component.

In pattern openings portion 12, remove with the area of pattern openings portion pattern openings portion 12 wall area and the value that obtains is the printing index.That is, thus with this printing index be can carry out the soft soldering paste more than 2.8 well be transferred as target.

Result of experiment is, under (A) the situation of use as the soft soldering paste, if the scraper plate leading section 82L and the clearance G between the mask to print surface 5 that do not contact with mask to print 11 are narrower than 0.12mm, then can hinder soft soldering paste 9 and in being formed on the circular-arc concave shape portion 8 of scraping front edge of board, flow, thereby cause the soft soldering paste dosage of transfer printing to tail off.

In addition, under (B) the situation of use as the soft soldering paste, if the scraper plate leading section 82 and the clearance G between the mask to print surface 5 that do not contact with mask to print 11 are narrower than 0.06mm, then can hinder soft soldering paste 9 and in being formed on the circular-arc concave shape portion 8 of scraping front edge of board, flow, thereby cause the soft soldering paste dosage of transfer printing to tail off.

On the other hand, if the scraper plate leading section 82L and the clearance G between the mask to print surface 5 that do not contact with mask to print 11 are wideer than 1mm, the soft soldering paste can't be enclosed when then printing and be formed in the circular-arc concave shape portion 8 of scraping front edge of board, the soft soldering paste can spill in circular-arc concave shape portion 8, thereby be applied to a little less than the power on the soft soldering paste 9 in the pattern openings portion 12 that is fills up to mask to print 11, so charging quantity and transfer printing quantity not sufficient.

According to this result of experiment as can be known, under 5 state of contact of a side 81L who is formed at the circular-arc 8L of concave shape portion that scrapes front edge of board and mask to print surface, scrape the opposing party 82L of the circular-arc 8L of concave shape portion of front edge of board and more than 10 times and below 1mm of average grain diameter that the clearance G between the mask to print surface 5 need be employed paste.The opposing party that what is called is scraped the circular-arc 8L of concave shape portion of front edge of board refer to scrape the circular-arc concave shape of being processed into of front edge of board and not with the mask to print surface 5 leading section 82L that contact.

In addition, as a comparative example, also carried out utilizing as shown in Figure 6, the printing experiment when scraping the scraper plate of scraper plate that front edge of board do not implement to process and the oblique grinding of having implemented linearity.

Consequently, do not implement if the diameter of the peristome 12 of pattern is not more than the 150 μ m, then can't to carry out good pattern printing under the situation of scraper plate of processing shown in Fig. 6 (b) utilizing to scraping front edge of board.In addition, under the situation of using the scraper plate that shown in Fig. 6 (c), to leading section, has carried out processing,, then can't carry out good pattern printing if the diameter of the peristome 12 of pattern is not more than the 120 μ m.

On the other hand, under the situation of using the scraper plate shown in Fig. 6 (d), by a plurality of faces, form concave shape to print, obtain with utilize Fig. 6 (a) with section with the roughly the same result of the situation of the scraper plate of circular-arc formation concave shape, all patterns that are formed on the pattern openings portion 12 of the diameter 50 μ m～200 μ m on the metal mask can be carried out serigraphy well.

Like this, the printing equipment of present embodiment 1 can carry with the size of the aperture area of the peristome of mask to print 11 irrespectively, with the paste precision scraper plate of printing well and stably.For this reason, by the scraper plate leading section is processed into special shape, carry out to mask to print 11 with desirable peristome pattern openings portion 12 filling paste, when being printed thing transfer printing paste, can promote the rolling of paste, thereby promote the filling of paste to the peristome 12 of mask to print 11, and, can to paste apply to the direction of peristome 12 approximate vertical of mask to print 11 on filling power.

(embodiment 2)

Present embodiment 2 is except using the mesh screen mask to mask to print 11, identical with the foregoing description 1.

In present embodiment 2, mask to print 11 is used mesh screen.As mesh screen, use utilized line directly be 16 μ m, yarn thick be the #325 plain weave mesh screen of the high-strength wire material of 35 μ m.In this mesh screen, using by thickness is that 35 μ m and thickness are that the diameter that the emulsion of 55 μ m forms is the mesh screen mask of the pattern openings portion of 50 μ m～200 μ m.

For utilize mesh screen tension force carry out mask to print 11 be printed thing 6 from version, the tension degree that makes mask to print is 0.2mm following (the tensiometer STG-80NA by PROTEK Co., Ltd. system measures).

The mask to print 11 employed wire-mesh screens that adopt in the present embodiment 2 have the aperture opening ratio 40% or more, and the line that is used in wire-mesh screen directly need be littler than half of the A/F of wire-mesh screen.

In the pattern openings portion 12 on being formed on the mesh screen mask, remove with the area of pattern openings portion pattern openings portion 12 wall area and the value that obtains is the printing index.That is, as the target of present embodiment 2, this printing index is more than 2.8 and can carries out the good transfer printing of soft soldering paste.

In embodiment 2, owing to have the mesh screen mask and be printed gap between the thing 6, so, with utilize embodiment 1 in the contact print of the metal mask that uses different, under surface 5 state of contact of a side 81L who is formed at the circular-arc 8L of concave shape portion that scrapes front edge of board and mask to print 11, the mesh screen mask is not level but is in the state of inclination.Therefore, the opposing party 82L of the circular-arc 8L of concave shape portion of the front end of scraper plate 1L and the clearance G between the mask to print surface 5 diminish.

Scraping the opposing party 82L of the circular-arc 8L of concave shape portion of front edge of board and the clearance G between the mask to print surface 5, need be more than 10 times and below 1mm of average grain diameter of employed paste.The opposing party who scrapes the circular-arc 8L of concave shape portion of front edge of board refer to scrape the circular-arc 8L of concave shape portion of being processed into of front edge of board not with the mask to print surface 5 leading section 82L that contact.

Because the particle diameter of the semiconductor particles of the soft soldering paste 9 that uses in the present embodiment 2 and the situation of embodiment 1 are below the 12 μ m in the same manner, so that side's that order does not contact with the mesh screen mask scraper plate leading section 82 and the clearance G between the mask to print surface 5 are 0.6mm.If scraper plate contacts with the mesh screen mask, then be not only paste is filled in the peristome of mesh screen mask, what also it can be discharged to the mesh screen mask is printed the thing side, then, when the front end of the scraper plate that originally helps to print arrives the peristome of mesh screen mask, can become the situation of secondary printing.Therefore, at the mesh screen mask and be printed and have paste to ooze out between the thing, can exosmose.

As the soft soldering paste, under the situation of the LF-204-15 that uses (A), if leading section 82L and the gap between the mask to print of that side's who does not contact with the mesh screen mask scraper plate 1L are narrower than 0.12mm, then can hinder soft soldering paste 9 in the circular-arc 8L of concave shape portion of the front end that is formed at scraper plate 1L, to flow, cause the soft soldering paste dosage of transfer printing to reduce.

In addition, under the situation of the M705-BPS7-T1J that uses (B), if leading section 82L and the gap between the mask to print of that side's who does not contact with the mesh screen mask scraper plate 1L are narrower than 0.06mm, then can hinder soft soldering paste 9 in the circular-arc 8L of concave shape portion of the front end that is formed at scraper plate 1L, to flow, cause the soft soldering paste dosage of transfer printing to reduce.

On the other hand, if leading section 82 and the clearance G between the mask to print surface 5 of that side's who does not contact with the mesh screen mask scraper plate 1L are wideer than 1mm, the soft soldering paste can't enter in the circular-arc 8L of concave shape portion of the front end that is formed on scraper plate 1L when then printing, can in circular-arc concave shape portion 8, spill, thereby be applied to a little less than the power on the soft soldering paste in the pattern openings portion 12 that is fills up to the mesh screen mask, so charging quantity and transfer printing quantity not sufficient.

The result who in present embodiment 2 printed state is verified is to have obtained and the result who comes to the same thing who in embodiment 1 printed state is verified.That is, all patterns that are formed on the pattern openings portion 12 of the diameter 50 μ m～200 μ m on the mesh screen mask can be carried out serigraphy well.

Like this, the printing equipment of present embodiment 2, can carry with the size of the aperture area of the peristome 12 of mask to print 11 irrespectively with the paste 9 precision scraper plate of printing well and stably.For this reason, by the scraper plate leading section is processed into special shape, carry out to mask to print 11 with desirable peristome pattern openings portion 12 filling paste, when being printed thing transfer printing paste, can promote the rolling of paste 9, thereby promote the filling of paste 9 to the peristome 12 of mask to print 11, and, can apply filling power on the direction with peristome 12 approximate vertical of mask to print 11 to paste 9.

(embodiment 3)

Utilize Fig. 7 that the scraper plate structure that carries on the printing equipment of present embodiment 3 is described.The scraper plate that uses in the present embodiment 3 has adopted flat scraper plate, and is that glass epoxy board 727 is inserted into the scraper plate 71 that the scraper plate center forms as supporting mass.

The synoptic diagram of the front end shape of the scraper plate 71 that uses in the present embodiment 3 as shown in Figure 8.In Fig. 8,, be the major part enlarged drawing that example shows the scraper plate structure with flat scraper plate for the front end shape of scraper plate 71 is described.

In present embodiment 3, the installation direction of scraper plate 71 is set to the direction opposite with the situation of embodiment 1, and scraper plate 71 is tilted to the direction identical with print direction 2.Except the shape that changes scraper plate 71, identical with the foregoing description 1.Because the formation of the printing equipment that uses in embodiment 3 is identical with the formation of utilizing Fig. 1 to be illustrated basically, the scraper plate that the scraping plate part 120L of Fig. 1 and 120R is replaced into formation shown in Figure 7 and paired with it formation obtains the therefore explanation of omitting whole pie graph.

In the installation of scraper plate, have as embodiment 1 and 2, to make situation that scraper plate 1 tilts to the direction opposite with print direction 2 and the situation that scraper plate 71 is tilted to print direction 2.Make scraper plate as embodiment 1 and 2 under the situation that the direction opposite with print direction 2 tilts, the face 10 of the scraper plate 1 that paste 9 is contacted is vertical in fact with the setting angle 17 of scraper plate 1.On the other hand, make scraper plate 71 under the situation that print direction 2 tilts, the direction of the face 710 of the scraper plate 71 that paste 9 is contacted is identical in fact with the setting angle 717 of scraper plate 71.

Equally in the present embodiment, it also is a kind of printing equipment, utilize scraper plate 71 that paste is transferred on the assigned position that is printed thing 6 that is fixed on the platform 231 from the mask to print 119 that the position in regulation has peristome 12, it is characterized in that, an angle of the front end of scraper plate 71 has circular-arc concave shape 78, and the angle of attack 719 between scraper plate 71 and the described printing surface that is printed thing 6 is littler than the setting angle 718 of scraper plate 71.

Thus, paste is enclosed in the circular-arc concave shape portion 78 of front end of scraper plate 71, and in based on the operation of scraping pressure (scraper plate 71 the silk screen face of mask to print 11 is exerted pressure (squeegee pressure) slide) on one side on one side on print direction, paste 9 can roll along the circular-arc concave shape portion 78 of the front end of scraper plate 71.

The scraper plate that uses in present embodiment 3 adopts with the resin of polyurethane as main component.

As shown in Figure 9, if reduce the angle of attack 719 and reduce the setting angle 717 of scraper plate 71, relative position skew can take place between the front end that then is used to apply the scraper head 715 of squeegee pressure and scraper plate 71 and the position 781 of contact print mask surface 5, therefore, can't be effectively the leading section of scraper plate 71 be applied squeegee pressure.That is, if at force place relative position skew takes place the turning moment effect is arranged then, in this case, squeegee pressure is high more, can act on more and the rightabout power of squeegee pressure scraping front edge of board.

Therefore, scraper head 715 is applied the direction of squeegee pressure and leading section and the contact point 781 mask to print surface 5 of scraper plate 71 is adjusted to roughly same direction.

In present embodiment 3, under a side 781 of the circular-arc concave shape portion 78 of the front end that is formed at scraper plate 71 and mask to print 11 state of contact, the opposing party 782 of the circular-arc concave shape portion 78 of the front end of scraper plate 71 and the clearance G between the mask to print surface 5 need be more than 10 times of average grain diameter of employed paste 9, and below 1mm.The opposing party of the circular-arc concave shape portion 878 of the front end of so-called scraper plate 71 refer to scraper plate 71 front end be processed into circular-arc concave shape portion 78 not with mask to print surface 5 leading sections that contact 782.

Because the particle diameter of the semiconductor particles of the soft soldering paste 9 that uses in the present embodiment 3 is below 12 μ m, so that side's that order does not contact with mask to print 11 scraper plate leading section 782 and the clearance G between the mask to print surface 5 are 0.3mm.When scraper plate 71 contacts with mask to print 11, not only paste is filled in the peristome 12 of mask to print 11, what also it can be discharged to mask to print 11 is printed thing 6 sides, then, when the front end of the scraper plate that originally helps to print arrives the peristome 12 of mask to print 11, can become the situation of secondary printing.Therefore, at mask to print 11 and be printed between the thing 6 and have paste to ooze out, can exosmose.

As the soft soldering paste, under the situation of using A, if that side's who does not contact with mask to print 11 scraper plate leading section 82 and the clearance G between the mask to print surface 5 are narrower than 0.12mm, then can hinder soft soldering paste synform to be formed in to scrape in the circular-arc concave shape portion 8 of front edge of board and flow, the soft soldering paste dosage of transfer printing can reduce.

In addition, using under the situation of B as the soft soldering paste, if that side's who does not contact with mask to print 11 scraper plate leading section 782 and the gap between the mask to print surface 5 are narrower than 0.06mm, then can hinder soft soldering paste 9 to flow in the circular-arc concave shape portion 78 that is formed at the scraper plate front end, the soft soldering paste dosage of transfer printing can reduce.

On the other hand, if the leading section 782 and the gap between the mask to print surface 5 of that side's who does not contact with mask to print 11 scraper plate 71 are wideer than 1mm, the soft soldering paste can't be enclosed in when then printing and be formed in the circular-arc concave shape portion 78 of scraping front edge of board, can in circular-arc concave shape portion 78, spill, thereby be applied to a little less than the power on the soft soldering paste 9 in the pattern openings portion 12 that is fills up to mask to print 11, so charging quantity and transfer printing quantity not sufficient.

In present embodiment 3, similarly to Example 1, at mask to print 11, using and formed diameter on thickness is the metallic plate of 70 μ m is the mask to print 11 of the pattern openings portion 12 of 50 μ m～200 μ m.

In present embodiment 3, scraper plate 71 is tilted to the direction identical with print direction 2, scraper plate 71 is 70 ° to the established angle 717 of scraper stent 73, and the initial contact-making surface of paste angle 718 (scraper plate 71 takes the lead in contacting the angle of direction of the scraper plate face 71 of paste 9) identical in fact with established angle 717 to scraper stent 73, all be 70 °.About the angle between the scraper plate contact-making surface of scraper plate 71 and mask to print 11, the change angle of attack 719 is studied.About printed state, verified to the filling of the pattern openings portion 12 of mask to print 11, to the transfer printing that is printed thing.

The result who in present embodiment 3 printed state is verified is to obtain and the result who comes to the same thing who in embodiment 1 printed state is verified.

Like this, the printing equipment of present embodiment 3, the size that can carry the aperture area in the peristome 12 with mask to print 11 is irrespectively with the paste precision scraper plate of printing well and stably.For this reason, be processed into special shape by leading section with scraper plate 71, carry out to mask to print 11 with desirable peristome 12 pattern openings portion 12 filling paste, when being printed thing transfer printing paste, can promote the rolling of paste, thereby promote the filling of paste to the peristome 12 of mask to print 11, and, can apply filling power on the direction with peristome 12 approximate vertical of mask to print 11 to paste.

(embodiment 4)

In the present embodiment 4, the scraper plate installation direction is set to the direction opposite with embodiment 1, and scraper plate is tilted to the direction identical with print direction 2.Except the shape that changes scraper plate, identical with the foregoing description 2.

The result who in present embodiment 4 printed state is carried out is to obtain and the result who comes to the same thing who in embodiment 2 printed state is verified.

Like this, the printing equipment of present embodiment 4, the size that can carry the aperture area in the peristome 12 with mask to print 11 is irrespectively with the paste precision scraper plate of printing well and stably.For this reason, by the scraper plate leading section is processed into special shape, carry out to mask to print 11 with desirable peristome pattern openings portion 12 filling paste, when being printed thing transfer printing paste, can promote the rolling of paste, thereby promote the filling of paste, and can apply filling power on the direction with peristome 12 approximate vertical of mask to print 11 paste to the peristome 12 of mask to print 11.

(embodiment 5)

Present embodiment 5 is except having carried out various changes to employed paste, identical with the foregoing description 1～embodiment 4.

In printing equipment of the present invention, employed paste is the high viscosity substance that solid constituent and liquid component mix, its solid constituent can use the particle formed with slicken solder, silver particles, flakey silver particles, with nickel as the particle of main component, by the material of at least a material in plated spherical resin particle, ceramic particle, the glass particle as main component, about being suitable for the object of these paste, its feature and print result are as follows.

The particle that slicken solder is formed is as the paste that solid constituent uses, and is used in the soft soldering splicing ear formation of the surface mounting technique of the pole plate projection etc. of printed wiring board, the pole plate projection of semiconductor wafer etc. etc.The shape of the particle that employed slicken solder is formed is roughly sphere.

The particle diameter of the particle that slicken solder is formed, can be according to employed pattern and about 1 μ m～selected in the scope about 30 μ m.In this case, consider the flowability of the paste of peristome, by the size that makes the patterns of openings 12 that is formed on the mask to print 11 is more than 10 times of particle diameter of the particle formed of slicken solder, thus, also can carry out the good printing same with embodiment 1～4 in the present embodiment.

That is, when the particle of slicken solder composition is the particle diameter of 1 μ m, patterns of openings is of a size of more than the 10 μ m; When the particle of slicken solder composition is the particle diameter of 30 μ m, patterns of openings is of a size of more than the 300 μ m.In order to form fine pattern, need the particle of the slicken solder composition of the fine particle diameter of use.

In addition, silver particles as the paste that solid constituent uses, is used in the wiring pattern formation of low-temperature sintered ceramics, the electrode formation of solar cell etc.The shape of employed silver particles is roughly sphere.

The particle diameter of silver particles be about 2nm to about the 10 μ m, under the situation that forms fine wiring pattern, need to use the particle of fine particle diameter.

On the other hand, the silver-colored soft soldering paste that forms about the electrode that is used in solar cell, owing to need reduce the wiring impedance of electrode, so require thickness with wiring pattern to form thicklyer and carry out sintering with low temperature, therefore, the paste that need to use the mix particles by the particle diameter of the particle of the particle diameter more than a few μ m and several nm to form.If wiring width is 50 μ m, then the particle diameter of employed silver particles is effective below 5 μ m.In the present embodiment, because the transfer printing raising, thus the depth-width ratio of wiring pattern shape (aspect) height, so can obtain the good printing effect that also can tackle for fine wiring.

In addition, as the paste that solid constituent uses, be the conductive adhesive that uses when printed wiring board carries article with the flakey silver particles, along with the miniaturization of electronic unit, this paste is used in lift-launch on the substrate with projected electrode.The flakey silver particles is exerted pressure to silver particles and is processed into the paper tinsel shape and obtains, and is irregular particle.The feature of this paste is, owing to guaranteeing electric conductivity by contact impedance, so not high to the transfer printing dimension precision requirement of printed wiring.In the present embodiment, owing to can improve discharge,, can print reliably so it is bad that local coating can not take place.

In addition, the particle that will be main component with nickel is used in the capacitor of the electric conductor that needs the formation ultrathin membrane etc. as the paste that solid constituent uses.The particle diameter that with nickel is the particle of main component be about 10nm to about the 100nm, it is characterized in that therefore the viscosity of paste is low, have flowability.

If the thick attenuation of yarn then keeps the quantitative change of paste few.Increasing under the situation of discharge rate, wishing to thicken yarn is thick.And on the other hand,, wish that then yarn is thick thinner for the membrane electrode formation of formation of micro-electrode wiring pattern and capacitor.Need thickly with the yarn after weaving comparing under the situation of attenuate, by roller mesh screen is rolled, thus, use to have the thick mesh screen of desirable yarn.Can select the kind (mesh number, aperture opening ratio, line footpath, yarn thick etc.) of mesh screen according to the equipment that is suitable for.

In present embodiment 5,,, can obtain good print result so can form uniform, extremely thin pattern owing to can improve discharge.

On the other hand, will be the anisotropic conductive paste by plated spherical resin particle as the paste that solid constituent uses, though be used to the terminal of display, to than the high component mounting that allows the printed wiring board that is electrically connected of metal bond resistance etc.By the particle diameter of plated resin particle is that the feature of printed patterns is about 10 μ m: be coated on whole of the blade portion of the parts that carried.In the present embodiment, owing to can improve discharge,, can obtain good print result so it is bad that local coating can not take place.

As the paste that solid constituent uses, the pattern of the etchant resist that the dielectric pattern that is used in low-temperature sintered ceramics forms, the insulating properties pattern of electronic circuit forms, use at the etching of covering the Copper Foil polyimides forms, the insulating barrier scribing (scribe) of solar cell is with pattern formation etc. with ceramic particle.In the present embodiment, owing to have reliable transfer printing performance,, can obtain good print result so it is bad that local broken string can not take place.

With glass particle as the paste that solid constituent uses, be used in as sintering aid in silver-colored soft soldering paste, add, the dielectric pattern of low-temperature sintered ceramics forms, the insulating properties pattern formation of electronic circuit etc.

Because ceramic particle and glass particle are made by pulverizing, so be broken shape.In these cases, need make the patterns of openings of employed mask to print is more than 10 times of average grain diameter.

The scraper plate 1 that uses in the present embodiment 5, an angle of scraping front edge of board has circular-arc concave shape portion 8, make the angle of attack between scraper plate and the described printing surface that is printed thing littler than the take the lead in setting angle (making scraper plate to the time) of the angle 18 (making scraper plate when tilting) of direction of the scraper plate face that contacts with paste or scraper plate of scraper plate 1 with the print direction rightabout with the print direction inclined, thus, can obtain for these all paste can both irrespectively precision be well and the printing equipment that stably prints with the size of aperture area in the pattern openings portion 12 of mask to print 11.

As mentioned above embodiments of the present invention are illustrated, for a person skilled in the art, can obtain various replacement examples according to the above description, revise or distortion, in the scope that does not break away from purport of the present invention, the present invention includes described various replacement example, revise or distortion.

Like this, the printing equipment of present embodiment 5, it is irrelevant with the paste precision scraper plate of printing well and stably to carry the size of the aperture area in the pattern openings portion 12 with mask to print 11.By the scraper plate leading section is processed into special shape, carry out to mask to print 11 with desirable peristome pattern openings portion 12 filling paste, when being printed thing transfer printing paste, can promote the rolling of paste, promote the filling of paste to the peristome 12 of mask to print 11, and, can apply filling power on the direction with peristome 12 approximate vertical of mask to print 11 to paste.

The present invention can implement by other concrete modes under the situation that does not break away from its purport or intrinsic propesties.Above embodiment should be considered to illustration rather than qualification in every respect, scope of the present invention is shown by claims, rather than aforesaid embodiment, and all enter in change in the meaning of claim and the full scope of equivalents all should be included in.

Claims (12)

1. silk-screen printing device has:

Mask holding mechanism, the mask that this mask holding mechanism keeps serigraphy to use;

Platform mechanism, this mechanism's mounting is carried out the test portion of serigraphy and this test portion is moved up and down;

Scraping plate mechanism, this scraping plate mechanism has scraper plate, and this scraper plate prints the pattern of soft soldering paste on the test portion of described institute of mechanism mounting via described mask;

Scraper plate driving mechanism, this scraper plate driving mechanism make the scraper plate of described scraping plate mechanism move back and forth along described mask, it is characterized in that,

Be formed with recess on the scraper plate of described scraping plate mechanism, this recess is formed on when the moving direction on described mask the time, when comparing with respect to printing with the mask position contacting with this scraper plate is positioned at place, the place ahead with the pushing and pressing of this scraper plate, and this recess forms as follows: vacate the gap below the 1mm between the end of the opposition side of mask contact side this recess and described and described mask.

2. silk-screen printing device has:

Mask holding mechanism, the mask that this mask holding mechanism keeps serigraphy to use;

Platform mechanism, this mechanism's mounting is carried out the test portion of serigraphy and this test portion is moved up and down;

Scraping plate mechanism, this scraping plate mechanism has scraper plate, and this scraper plate prints the pattern of soft soldering paste on the test portion of described institute of mechanism mounting via described mask;

Scraper plate driving mechanism, this scraper plate driving mechanism make the scraper plate of described scraping plate mechanism move back and forth along described mask, it is characterized in that,

Be formed with the recess that accumulates described soft soldering paste on the scraper plate of described scraping plate mechanism, this recess is formed between the initial contact-making surface of paste of this scraper plate that contacts with the soft soldering paste at first when described scraper plate was driven by described scraper plate driving mechanism to be pushed the state that is against on the described mask when this scraper plate was with the mask position contacting, with printing when pushing against this scraper plate on described mask.

3. silk-screen printing device as claimed in claim 1 or 2 is characterized in that,

The recess of described scraper plate forms as follows: during described printing, when described scraper plate is driven by described scraper plate driving mechanism to be pushed the state that is against on the described mask, described soft soldering paste rolls in the inside of described recess.

4. silk-screen printing device as claimed in claim 3 is characterized in that,

The recess of described scraper plate forms as follows: with the pushing and pressing of this scraper plate on described mask the time, sky is opened about 10 times gap of average grain diameter of the particle of described soft soldering paste between the end of the opposition side of mask contact side described recess and described and the described mask.

5. silk-screen printing device as claimed in claim 4 is characterized in that,

Described scraper plate is that the hardness of polyurethane is that the above resin of 80 degree forms by main component.

6. method for printing screen,

The test portion that carries out serigraphy is closely contacted on the mask that serigraphy is used,

The soft soldering paste is supplied on the mask that makes the tight contact of described test portion,

On the mask that has been supplied to this soft soldering paste, this scraper plate is moved on one side to a direction scraper plate pushing and pressing on one side,

State from this scraper plate to the mobile end of a direction under described test portion is peeled off from described mask, thus, make the pattern that is formed on the described silk screen on described test portion, form pattern based on the soft soldering paste, it is characterized in that,

On described scraper plate, moving direction when pushing against this scraper plate on described mask, when comparing with respect to printing with the mask position contacting with this scraper plate is positioned at place, the place ahead and is formed with recess, when making this scraper plate when a direction moves while pushing against scraper plate on the described mask, in described recess accumulate soft soldering paste and on one side print on one side.

7. method for printing screen as claimed in claim 6 is characterized in that,

On described mask, this scraper plate is moved on one side the scraper plate pushing and pressing on one side, thus, while the soft soldering paste in the recess that accumulates in described scraper plate is printed in the rolling of the inside of this recess.

8. method for printing screen as claimed in claim 6 is characterized in that,

The recess of described scraper plate forms as follows: when pushing against this scraper plate on described mask, vacate the gap below the 1mm between the end of opposition side this scraper plate and the mask contact position and the described mask, print while utilize this scraper plate to make to accumulate in soft soldering paste in the described recess to roll.

9. method for printing screen as claimed in claim 8 is characterized in that,

The recess of described scraper plate forms as follows: when pushing against this scraper plate on described mask, vacate about 10 times gap of average grain diameter of the particle of described soft soldering paste between the end of the opposition side of mask contact side described recess and described and the described mask, print while utilize this scraper plate to make to accumulate in soft soldering paste in the described recess to roll.

10. method for printing screen as claimed in claim 9 is characterized in that,

Described scraper plate is that the hardness of polyurethane is that the above resin of 80 degree forms by main component, while the soft soldering paste rolling that utilizes this scraper plate to make to accumulate in the described recess is printed.

11. method for printing screen as claimed in claim 10 is characterized in that,

As described mask, use the mask that forms by metallic plate.

12. method for printing screen as claimed in claim 10 is characterized in that,

As described mask, use the mask that forms by wire-mesh screen.

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