CN109109481A - A kind of printing process of tin cream - Google Patents

A kind of printing process of tin cream Download PDF

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Publication number
CN109109481A
CN109109481A CN201810871869.1A CN201810871869A CN109109481A CN 109109481 A CN109109481 A CN 109109481A CN 201810871869 A CN201810871869 A CN 201810871869A CN 109109481 A CN109109481 A CN 109109481A
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CN
China
Prior art keywords
pad area
tin cream
steel mesh
solder mask
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810871869.1A
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Chinese (zh)
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CN109109481B (en
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Yijia Electronics Co ltd
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Shenzhen Fulai Technology Co Ltd
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Priority to CN201810871869.1A priority Critical patent/CN109109481B/en
Publication of CN109109481A publication Critical patent/CN109109481A/en
Application granted granted Critical
Publication of CN109109481B publication Critical patent/CN109109481B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00Inking and printing with a printer's forme
    • B41M1/12Stencil printing; Silk-screen printing

Landscapes

  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Screen Printers (AREA)

Abstract

The present invention provides a kind of printing process of tin cream, and preparation method is specially to provide a printed circuit board, has the first pad area, the second pad area and non-pad area on the upper surface of printed circuit board, print solder paste thickness needed for the first pad area is greater than the second pad area;The first solder mask is prepared on non-pad area;The second solder mask is prepared on the first solder mask;The second solder mask removed around the second pad area forms the first Printing Zone;Cover steel mesh;Tin cream is applied on steel mesh, scraper is in steel online mobile, by deforming when the first Printing Zone and being close to the first solder mask, it presses scraper tin cream and passes through steel mesh coated on the first pad area, the second pad area, to lower recess around second pad area and the second pad area, the thickness for the tin cream for being covered on the second pad area is made to be less than the thickness for being covered on the tin cream of the first pad area;Steel mesh is removed, the different tin cream of thickness is finally made in same printed circuit board.

Description

A kind of printing process of tin cream
Technical field
The present invention relates to printed circuit board packaging technology more particularly to a kind of printing processes of tin cream.
Background technique
During manufacturing electronic product, need that various components are welded to printing using surface mounting technology (SMT) On circuit board, more common surface mount process process are as follows: exist first in the one side that printed circuit board needs to mount component The position coating tin cream for needing to mount component, then will need the component welded to be attached to the corresponding position of printed circuit board again On, reflow soldering is carried out after completing the attachment of component, this completes the printed circuit board wherein attachment of upper component on one side, Through surface mount can be completed after the assay was approved.
Steel mesh is a kind of surface mounting technology particular manufacturing craft, and major function is to aid in the deposition of tin cream, it is therefore an objective to will be quasi- The tin cream of exact figures amount is transferred to the position of the correspondence pad in printed wiring board.Since different components are welded to tin cream thickness Demand is different, often will use ladder steel mesh, the thickness of the different zones steel disc on the ladder steel mesh in the process of paste solder printing Degree is different, so the thickness of tin cream is not also identical on last pad.
But ladder steel mesh complex manufacturing technology, and it is at high cost;Printing effect is bad, if the area in the thin region of ladder steel mesh It is too small, it will result in the phenomenon that this region is easy to appear tin cream residual.
Summary of the invention
The technical problem to be solved in the present invention is to provide paste solder printings a kind of at low cost and with preferable printing effect Method.
In order to solve the above technical problems, the present invention adopts the following technical solutions: a kind of printing process of tin cream is used for Print solder paste in printed circuit board assembling process, comprising the following steps:
(1) printed circuit board is provided, there is the first pad area, the second pad area on the upper surface of the printed circuit board And non-pad area, print solder paste thickness needed for first pad area are greater than second pad area;
(2) the first solder mask is prepared on the non-pad area;
(3) the second solder mask is prepared on first solder mask;
(4) the second solder mask removed around the second pad area forms the first Printing Zone;
(5) one layer of steel mesh is covered on second solder mask;
(6) tin cream is applied on the steel mesh, using scraper in the steel online mobile, the scraper is by the first printing The steel mesh deformation sinks and is close to first solder mask when area, and pressing the scraper makes the tin cream on the steel mesh pass through institute Steel mesh is stated coated on first pad area, on second pad area, second pad area and second pad area Surrounding makes the thickness for the tin cream for being covered on second pad area be less than the tin cream for being covered on first pad area to lower recess Thickness;
(7) steel mesh is removed.
Design concept according to the present invention, steel mesh of the present invention further include ontology and the positioning for being set to outer body Frame positions the steel mesh by the posting.
Design concept according to the present invention, in step S5 of the present invention, the steel mesh includes through the of the ontology One printing hole and the second printing hole, first printing hole and second printing hole and first pad area and described second The position of pad area and size are corresponding.
Design concept according to the present invention, in step S2 of the present invention, described in first solder mask and step S3 Second solder mask under ultraviolet excitation, is cross-linked into solid-state and is prepared by the welding resistance oil of liquid.
Design concept according to the present invention, welding resistance oil of the present invention include epoxy resin, emulsion, solvent, filler And pigment.
Design concept according to the present invention, a length of 365nm of the ultraviolet light wave of ultraviolet irradiation of the present invention, power be 5~ 10W。
Design concept according to the present invention, in step S6 of the present invention, the angle of scraper and steel mesh is 45~60 °.
Design concept according to the present invention, in step S6 of the present invention, the rolling diameter of tin cream is 9~15mm.
Design concept according to the present invention, in step S2 of the present invention, the thickness of the first welding resistance oil reservoir is greater than 0.1mm。
Compared with prior art, the present invention have it is following the utility model has the advantages that
The method provided by the invention for printing different-thickness tin cream on a printed circuit, is used only common steel mesh, passes through The thickness that two layers of welding resistance oil reservoir adjusts prepared tin cream can reach preferable printing effect, both drop without making ladder steel mesh Low process costs, while more solving ladder steel mesh to the restricted of components' placement.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, for ability For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached Figure.
Fig. 1 is the flow diagram of print solder paste on the printed circuit board of one embodiment of the invention offer;
Fig. 2 to Fig. 9 is the structural schematic diagram of print solder paste on printed circuit board provided in an embodiment of the present invention;
Figure 10 is the structural schematic diagram of the common steel mesh covered on printed circuit board provided in an embodiment of the present invention;
In figure:
10, printed circuit board;20a, the first pad area;20b, the second pad area;20c, non-pad area;30, the first welding resistance Layer;40, the second solder mask;40a, the first printing zone;50, steel mesh;50a, the first printing hole;50b, the second printing hole;50c, Steel mesh ontology;60, tin cream.
Specific embodiment
It is clear in order to be more clear the purpose of the present invention, technical solution and advantageous effects, below in conjunction with this hair Attached drawing in bright embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described Embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field Those of ordinary skill's every other embodiment obtained without making creative work, belongs to protection of the present invention Range.
As shown in Fig. 1, a kind of printing process of tin cream comprising following steps:
Step S1: a printed circuit board 10 is provided, there is the first pad area on the upper surface of the printed circuit board 10 20a, the second pad area 20b and non-pad area 20c, print solder paste thickness needed for the first pad area 20a are greater than described second Pad area 20b;
Step S2: the first solder mask 30 is prepared on the non-pad area 20c;
Step S3: the second solder mask 40 is prepared on first solder mask 30;
Step S4: the second solder mask 40 removed around the second pad area 20b forms the first Printing Zone 40a;
Step S5: one layer of steel mesh 50 is covered on second solder mask 40;
Step S6: being applied tin cream 60 on the steel mesh 50, moved on the steel mesh 50 using scraper, the scraper warp The steel mesh 50 deformation sinks and is close to first solder mask 30 when crossing the first Printing Zone 40a, press the scraper make it is described Tin cream 60 on steel mesh 50 passes through the steel mesh 50 and is coated on the first pad area 20a, the second pad area 20b, institute State around the second pad area 20b and the second pad area 20b to lower recess, make to be covered on the second pad area 20b and The thickness of tin cream 60 around the second pad area 20b is less than the thickness for being covered on the tin cream 60 of the first pad area 20a Degree;
Step S7: the steel mesh 50 is removed.
Common steel mesh is used only in the method for print solder paste provided by the invention, by prepared by two layers of welding resistance oil reservoir adjusting The thickness of tin cream can reach preferable printing effect without making ladder steel mesh, both reduce process costs, while more solving Ladder steel mesh determined to the restricted of components' placement.
With reference to the accompanying drawings, the printing process of the tin cream is elaborated.
Attached drawing 2 is please referred to, step S1 is executed, a printed circuit board 10 is provided.Since different electronic components is mounted The thickness of required tin cream 60 is different, has the first pad area 20a, the second pad on the upper surface of the printed circuit board 10 The thickness of print solder paste 60 needed for area 20b and non-pad area 20c, the first pad area 20a is greater than the second pad area 20b Thickness;
Attached drawing 3 is please referred to, step S2 is executed, prepares the first solder mask 30 on the non-pad area 20c.;Described first Solder mask 30 is prepared by welding resistance oil, and the welding resistance oil includes epoxy resin, emulsion, solvent, filler and pigment, tool Production procedure are as follows: use laser printing, using film as print media, make welding resistance film;By printed circuit to be printed 10 surface cleaning of plate is clean, air-dries after washing;The welding resistance oil is uniformly coated to printing electricity in a manner of silk-screen or roller coating 10 surface of road plate;Printed welding resistance film is be overlapped with printed circuit board 10, and between printed circuit board 10 and welding resistance film not It interspaces, is placed in a length of 365nm of ultraviolet light wave, is exposed under the ultraviolet lamp that power is 5~10W;After the solidification of liquid solder mask oil Welding resistance film is removed, by uncured liquid welding resistance oil on the first pad area 20a being blocked and the second pad area 20b with anhydrous Alcohol or banana oil are wiped, and are rinsed with clear water, air-dry, the first solder mask 30 is made.Preferably, the first prepared welding resistance oil reservoir Thickness be greater than 0.1mm.
Attached drawing 4 is please referred to, step S3 is executed, prepares the first solder mask 30 in preparation 40 process of the second solder mask and step S2 Unanimously.
It please refers to attached drawing 5 and attached drawing 6, executes step S4, the second solder mask 40 around the second pad area 20b is consolidated at it It is removed after change, forms the first Printing Zone 40a.
Attached drawing 7 and attached drawing 10 are please referred to, step S5 is executed, one layer of steel mesh 50 is covered on second solder mask 40.Institute Stating steel mesh 50 further includes ontology 50c and the posting (not shown) being set on the outside of ontology 50c, by the posting to described Steel mesh 50 positions.The steel mesh 50 of going back includes the first printing hole 50a and the second printing hole 50b through the ontology, and described the Position and the size of one printing hole 50a and the second printing hole 50b and the first pad area 20a and the second pad area 20b It is corresponding.
Attached drawing 8 is please referred to, step S6 is executed, tin cream 60 is applied on the steel mesh 50, scraper is with certain speed and angle Degree moves forward, and certain pressure is generated to tin cream 60, pushes 60 rolls forward of tin cream.Scraper moves on the steel mesh 50, When the scraper passes through the first Printing Zone 40a, the steel mesh 50 is sunk by the pressure distortion of scraper and is close to first resistance Layer 30, pressing the scraper makes the tin cream 60 on the steel mesh 50 pass through the steel mesh 50 coated on first pad area On 20a, the second pad area 20b, to lower recess around the second pad area 20b and the second pad area 20b, cover Cover the tin cream 60 of the second pad area 20b thickness be less than be covered on the first pad area 20a tin cream 60 thickness;
When the pressure of scraper is pressure when scraper just scrapes the tin cream on most steel mesh 50, the angle of scraper and steel mesh 50 is 45~60 °, when the rolling diameter of tin cream 60 is 9~15mm, the coating of tin cream 60 is uniform, and effect is preferable.
Attached drawing 8 is please referred to, step S7 is executed, the steel mesh 50 is removed.
As described above, on printed circuit board of the present invention print solder paste method, pass through preparation the first solder mask 30 With the second solder mask 40, removal needs to print the second solder mask 40 of the first Printing Zone 40a of thin tin cream thickness, borrows steel knife pressure Power makes the deformation of steel mesh 50 be close to the first solder mask 30, reaches and prepares different-thickness tin cream 60 on same printed circuit board 10 Purpose.Common steel mesh 50 is used only in this method, and the thickness of prepared tin cream 60 is adjusted by the first solder mask 30 and the second solder mask 40 Degree, without making ladder steel mesh, can reach preferable printing effect.Both process costs are reduced, while more solving ladder Steel mesh is to the restricted of components' placement.

Claims (9)

1. a kind of printing process of tin cream, is used for the print solder paste in printed circuit board assembling process, which is characterized in that described The printing process of tin cream its include the following steps:
Step S1: a printed circuit board is provided, there is the first pad area, the second pad area on the upper surface of the printed circuit board And non-pad area, print solder paste thickness needed for first pad area are greater than second pad area;
Step S2: the first solder mask is prepared on the non-pad area;
Step S3: the second solder mask is prepared on first solder mask;
Step S4: the second solder mask removed around the second pad area forms the first Printing Zone;
Step S5: one layer of steel mesh is covered on second solder mask;
Step S6: applying tin cream on the steel mesh, and using scraper in the steel online mobile, the scraper is by the first printing The steel mesh deformation sinks and is close to first solder mask when area, and pressing the scraper makes the tin cream on the steel mesh pass through institute Steel mesh is stated coated on first pad area, on second pad area, second pad area and second pad area Surrounding makes the thickness for the tin cream for being covered on second pad area be less than the tin cream for being covered on first pad area to lower recess Thickness;
Step S7: the steel mesh is removed.
2. a kind of printing process of tin cream according to claim 1, which is characterized in that the steel mesh further includes ontology and sets It is placed in the posting of outer body, the steel mesh is positioned by the posting.
3. a kind of printing process of tin cream according to claim 2, which is characterized in that in step S5, the steel mesh includes Through the first printing hole and the second printing hole of the ontology, first printing hole and the second printing hole and first pad The position and size of area and second pad area are corresponding.
4. a kind of printing process of tin cream according to claim 1, which is characterized in that the first solder mask described in step S2 With the second solder mask described in step S3 by the welding resistance oil of liquid under ultraviolet excitation, be cross-linked into solid-state and be prepared.
5. a kind of printing process of tin cream according to claim 3, which is characterized in that the welding resistance oil includes asphalt mixtures modified by epoxy resin Rouge, emulsion, solvent, filler and pigment.
6. a kind of printing process of tin cream according to claim 3, which is characterized in that the ultraviolet light wave of the ultraviolet irradiation A length of 365nm, power are 5~10W.
7. a kind of printing process of tin cream according to claim 1, which is characterized in that in step S6, scraper and steel mesh Angle is 45~60 °.
8. a kind of printing process of tin cream according to claim 1, which is characterized in that in step S6, the rolling of the tin cream Dynamic diameter is 9~15mm.
9. a kind of printing process of tin cream according to claim 1, which is characterized in that in step S2, first welding resistance The thickness of oil reservoir is greater than 0.1mm.
CN201810871869.1A 2018-08-02 2018-08-02 Printing method of solder paste Active CN109109481B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810871869.1A CN109109481B (en) 2018-08-02 2018-08-02 Printing method of solder paste

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Application Number Priority Date Filing Date Title
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CN109109481B CN109109481B (en) 2020-12-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113145960A (en) * 2021-05-06 2021-07-23 昆山联滔电子有限公司 Electronic product welding method
CN114501846A (en) * 2022-02-08 2022-05-13 湖南越摩先进半导体有限公司 Method for mounting components on circuit board and circuit board

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH047893A (en) * 1990-04-25 1992-01-13 Mitsubishi Electric Corp Printing method for solder paste
DE19923166A1 (en) * 1999-05-20 2000-12-07 Lpkf Laser & Electronics Ag Producing template for applying solder paste to circuit boards involves forming compound foil with different thicknesses by sticking first foil onto further foil(s) with pre-formed cut-outs
JP2009237132A (en) * 2008-03-26 2009-10-15 Dainippon Printing Co Ltd Color filter, method of manufacturing color filter, and liquid crystal display device
JP2011114113A (en) * 2009-11-26 2011-06-09 Fujikura Ltd Carrier board for printing flexible printed board and solder paste print method using the same
JP2012254528A (en) * 2011-06-07 2012-12-27 Toppan Printing Co Ltd Method for manufacturing ornament
CN103219356A (en) * 2012-01-19 2013-07-24 索尼公司 Display and method of manufacturing the same, unit, transfer printing method
CN104703457A (en) * 2013-12-06 2015-06-10 松下知识产权经营株式会社 Electronic component mounting method and electronic component mounting system
CN105172400A (en) * 2015-10-27 2015-12-23 华东光电集成器件研究所 Method for silk-screen printing of different film thicknesses
CN106793534A (en) * 2015-11-20 2017-05-31 富泰华工业(深圳)有限公司 Circuit board steel mesh printing process
CN107160831A (en) * 2016-03-07 2017-09-15 富士施乐株式会社 The manufacture method of heater, the manufacture method of printed matter and silk-screen printing device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH047893A (en) * 1990-04-25 1992-01-13 Mitsubishi Electric Corp Printing method for solder paste
DE19923166A1 (en) * 1999-05-20 2000-12-07 Lpkf Laser & Electronics Ag Producing template for applying solder paste to circuit boards involves forming compound foil with different thicknesses by sticking first foil onto further foil(s) with pre-formed cut-outs
JP2009237132A (en) * 2008-03-26 2009-10-15 Dainippon Printing Co Ltd Color filter, method of manufacturing color filter, and liquid crystal display device
JP2011114113A (en) * 2009-11-26 2011-06-09 Fujikura Ltd Carrier board for printing flexible printed board and solder paste print method using the same
JP2012254528A (en) * 2011-06-07 2012-12-27 Toppan Printing Co Ltd Method for manufacturing ornament
CN103219356A (en) * 2012-01-19 2013-07-24 索尼公司 Display and method of manufacturing the same, unit, transfer printing method
CN104703457A (en) * 2013-12-06 2015-06-10 松下知识产权经营株式会社 Electronic component mounting method and electronic component mounting system
CN105172400A (en) * 2015-10-27 2015-12-23 华东光电集成器件研究所 Method for silk-screen printing of different film thicknesses
CN106793534A (en) * 2015-11-20 2017-05-31 富泰华工业(深圳)有限公司 Circuit board steel mesh printing process
CN107160831A (en) * 2016-03-07 2017-09-15 富士施乐株式会社 The manufacture method of heater, the manufacture method of printed matter and silk-screen printing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113145960A (en) * 2021-05-06 2021-07-23 昆山联滔电子有限公司 Electronic product welding method
CN114501846A (en) * 2022-02-08 2022-05-13 湖南越摩先进半导体有限公司 Method for mounting components on circuit board and circuit board
CN114501846B (en) * 2022-02-08 2023-06-02 湖南越摩先进半导体有限公司 Method for installing components on circuit board and circuit board

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Effective date of registration: 20201112

Address after: No.50, Hu Ming Road, Huwei village, Heshang Town, Changle District, Fuzhou City, Fujian Province

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Address before: 518000 Guangdong, Shenzhen, Luohu District, Dongmen street, 123 Shennan Road, Shenzhen, department store building, east side, 1-B02

Applicant before: SHENZHEN FULAIGUO TECHNOLOGY Co.,Ltd.

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Patentee after: NINGBO YIJIA ELECTRONICS Co.,Ltd.

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Address before: 350000, 50 Huming Road, Huwei Village, Heshang Town, Changle District, Fuzhou City, Fujian Province

Patentee before: Li Xiaopeng

Country or region before: China