WO2011158412A1 - 実装構造体とその製造方法ならびに実装構造体のリペア方法 - Google Patents
実装構造体とその製造方法ならびに実装構造体のリペア方法 Download PDFInfo
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- WO2011158412A1 WO2011158412A1 PCT/JP2011/002062 JP2011002062W WO2011158412A1 WO 2011158412 A1 WO2011158412 A1 WO 2011158412A1 JP 2011002062 W JP2011002062 W JP 2011002062W WO 2011158412 A1 WO2011158412 A1 WO 2011158412A1
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- flux
- coating resin
- electronic component
- mounting structure
- circuit board
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- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
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- H05K2203/176—Removing, replacing or disconnecting component; Easily removable component
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3489—Composition of fluxes; Methods of application thereof; Other methods of activating the contact surfaces
Definitions
- the present invention relates to a mounting structure in which an electronic component mounted on a substrate or the like is coated with a resin composition to improve waterproof and moistureproof performance.
- the electronic components and circuit boards on which they are mounted are designed to eliminate the influence of moisture and dust in the environment on the electronic components, and to protect the electronic components from vibrations and shocks. Is coated with a resin.
- This type of coating resin is required to have excellent heat resistance, insulation, flexibility, wear resistance, adhesion, and acrylic resin, urethane resin, polyolefin resin, silicon resin, etc. alone or Used in complex systems.
- the resin is uniformly applied in the form of a solution, and when it contains a solvent, the resin is volatilized and then cured on the bonded structure to obtain the desired coating resin.
- circuit boards mounted on electronic control parts of automobiles are required to withstand high temperatures of about 150 ° C.
- epoxy based on heat resistance and gas barrier properties are required.
- Resins such as resins, urethane resins, and silicon resins are used.
- urethane resins are attracting attention in terms of cost.
- Some conventional urethane resins use polyester polyol or polybutadiene as the main agent to prevent migration in a moist heat environment (see, for example, Patent Document 1).
- the circuit board which is the base
- the activator component contained in this flux Resin causes an inhibition of curing by the amine or organic acid, and the degree of curing of the resin film is lowered, so that the film strength cannot be expressed.
- the flux remaining on the circuit board is cracked, and the effect extends to the coating film, so that the coating resin is peeled off.
- the flux remaining on the circuit board is cleaned with a flux cleaning agent containing water or warm water, an alcohol solvent, a surfactant and the like.
- An object of the present invention is to provide a mounting structure that can obtain good waterproof / moisture-proof performance of an electronic component and that has good repairability of the electronic component.
- the mounting structure of the present invention is a mounting structure in which an electronic component is mounted on a circuit board with a bonding metal, the coating resin containing 10 to 50% by weight of isocyanate and covering the circuit board, the electronic component, and the bonding metal; And a flux containing a compound having a hydroxyl group and remaining on the surface of the bonding metal, and a reaction product of the coating resin and the flux formed at an interface between the flux and the coating resin.
- the method for manufacturing a mounting structure includes mounting an electronic component on a circuit board with a bonding metal using a flux, and using the coating resin containing 10 to 50% by weight of isocyanate, the circuit board, the electronic component, and The bonding metal is covered, and a reaction product is generated at an interface of the flux containing the coating resin and a compound having a hydroxyl group.
- an electronic component is mounted on a circuit board with a bonding metal, and the circuit board, the electronic component and the bonding metal are covered with a coating resin containing 10 to 50% by weight of isocyanate,
- a coating resin containing 10 to 50% by weight of isocyanate When replacing the electronic component of the mounting structure in which a reaction product of the coating resin and the flux is formed at the interface of the flux containing the coating resin and a compound having a hydroxyl group and remaining on the surface of the bonding metal, the reaction An object is softened to a temperature equal to or higher than a glass transition temperature of the flux to peel off the coating resin around the electronic component, and the electronic component is removed from the circuit board and replaced.
- the coating resin is applied to the circuit board and the electronic parts on the circuit board and their joints after mixing the main agent and the curing agent.
- the polyol of the main agent and the isocyanate of the curing agent in the coating resin immediately after coating are not completely reacted and contain an unreacted isocyanate group at the terminal. Isocyanate groups react with the hydroxyl groups in the solder flux, so curing is completed with the flux components incorporated, eliminating the need for flux cleaning, reducing the amount of work, improving productivity, and reducing costs. Reduction is possible.
- the electronic component and its surroundings are heated to a temperature equal to or higher than the glass transition point of the flux, so that the surroundings of the electronic component or the side surface of the electronic component is
- the coating resin in contact with the flux is reduced in hardness as the flux component is softened, so it can be easily peeled without damaging the surrounding electronic components, thus reducing the amount of work involved in repair. be able to.
- FIG. 1 shows a mounting structure according to the first embodiment.
- an electronic component 2 is mounted on a wiring pattern 1a of a circuit board 1 with solder 3 as a bonding metal. Furthermore, the circuit board 1, the electronic component 2, and the solder 3 are covered with an applied coating resin 5 to achieve the desired waterproof / moisture-proof performance.
- the flux 4 adhering to the surface of the solder 3 is a residue used for soldering the electronic component 2 to the wiring pattern 1a satisfactorily.
- reaction product 8 of the flux 4 and the coating resin 5 is formed at the interface between the flux 4 and the coating resin 5.
- the reactant 8 is formed not only on the side surface of the electronic component but also on the upper surface of the electronic component 2 in the first embodiment.
- the electronic component 2 is useful when it is a semiconductor component having a chip size package (CSP: Chip size package) or a ball grid array (BGA) package.
- CSP Chip size package
- BGA ball grid array
- the type of the circuit board 1 is not particularly limited, and for example, a base made of glass fiber or heat-resistant resin is used. Usually, a circuit board in which a copper foil wiring is printed on a glass cloth impregnated with an epoxy resin or the like is used.
- This mounting structure can be manufactured by the process shown in FIG.
- the cream solder 6 is supplied to the wiring pattern 1a at the mounting position of the electronic component 2 by a dispenser or the like.
- the cream solder 6 is obtained by kneading the particles of the solder 3 in the flux 4.
- the electronic component 2 When the electronic component 2 is set on the cream solder 6 and passed through the reflow furnace, the electronic component 2 is soldered to the wiring pattern 1a by the solder 3 in the cream solder 6 as shown in FIG. 2 (b). 3 and the flux 4 adheres to the surface. Also, a part of the melt flux spreads and adheres to the upper surface 2a of the electronic component 2 due to the action of surface tension.
- the coating resin 5 is applied on the flux 4, and the circuit board 1, the electronic component 2, and the solder 3 are bonded.
- the covering process is carried out and the conventional flux cleaning process is not required.
- the reactant 8 acting to achieve the desired waterproof / moisture-proof performance without carrying out the flux cleaning process uses the following components as the flux 4 and the coating resin 5.
- Coating resin 5 includes a main agent and a curing agent.
- the resin of the curing agent of the coating resin 5 is preferably a type that is cured by heating, but may be a type that is cured by moisture in the air.
- the curing temperature of the curing agent resin is not particularly limited, but it is desirable that the curable resin can be cured at a temperature lower than 150 ° C. from the viewpoint of avoiding adverse effects on the solder 3 on the circuit board. That is, when the resin composition is cured, it is desirable to select a temperature of 150 ° C. or lower as the curing temperature.
- polybutadiene or polyisoprene having two or more hydroxyl groups, or polyolefin obtained by adding hydrogen to the double bond portion thereof can be used as the polyol component. If such a polyol is used, the resulting polyurethane becomes a good elastomer (rubber elastic body), and it can adhere to a circuit board and electrical / electronic components and exhibit good insulation while maintaining heat resistance. It becomes.
- the molecular weight (number average) of the polyol having two or more hydroxyl groups is preferably in the range of 700 to 8,000, more preferably in the range of 1,000 to 5,000, and still more preferably in the range of 1500 to 4000. .
- the curing agent for coating resin 5 includes compounds having an isocyanate group, aromatic isocyanates such as toluylene 2,4-diisocyanate (TDI), diphenylmethane diisocyanate (MDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (Known compounds such as aliphatic isocyanates such as HMDI) and alicyclic isocyanates such as isophorone diisocyanate (IPDI) can be used as a main component. These may be used alone or as a mixture of two or more. Among these, diphenylmethane diisocyanate and isophorone diisocyanate are preferable. This is because they are inexpensive, liquid and easy to handle, low volatility and high safety.
- aromatic isocyanates such as toluylene 2,4-diisocyanate (TDI), diphenylmethane diisocyanate (MDI), xylylene diisocyanate
- Additives include curing catalysts, foam stabilizers, emulsifiers, flame retardants such as phosphorus compounds and halogen compounds, antioxidants, anti-aging agents, UV absorbers, plasticizers, talc, clay, calcium carbonate, silica powder, You may contain suitably fillers, such as an alumina, carbon black, a titanium oxide, and an iron oxide, dye, and a pigment.
- the amount of isocyanate in the curing agent of the coating resin is too small, the reaction with the flux 4 does not proceed sufficiently, and the adhesion at the interface between the flux 4 and the film is lowered. Therefore, it is not possible to obtain a film thickness sufficient to ensure waterproofness and moistureproofness.
- the amount of isocyanate is too large, the crosslinking density in the resin composition is excessively increased, the adhesion between the electronic component and the substrate is lowered, and the function as a coating agent for ensuring waterproof and moisture proof properties is lowered.
- the flux 4 contains a compound having a hydroxyl group, other components are not particularly limited.
- the main component of the flux conventionally known ones such as resin systems such as rosin and synthetic resins, organic systems such as organic acids, organic halogen compounds, and amines and amides can be used.
- activators such as phosphoric acid, ammonium phosphate, organic carboxylic acids (eg stearic acid, adipic acid, salicylic acid), lactic acid, glutamic acid, fatty acid amide, urea, ethylenediamine, aliphatic amines, phthalate esters (eg dibutyl) Phthalates, dioctyl phthalates, etc.), esters of carboxylic acids (eg, dibutyl adipate, dioctyl malate, etc.), plasticizers such as phosphate esters (eg, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, etc.), ethylene glycol, Diethylene glycol monobutyl ether, triethylene glyco
- the flux 4 is supplied together with the solder 3 when the electronic component is mounted on the circuit board, and after reflowing, the flux 4 is arranged on the periphery, the upper surface, and the side surface of the mounted electronic component as described above. .
- the main agent and the curing agent are separately introduced into the mixer portion at a specified amount ratio in a two-pack type discharge device, and both are sufficiently mixed.
- the reaction starts at the time of mixing in the mixer section, is sent out from the mixer section to the nozzle portion, and is applied onto the circuit board 1 and the electronic component 2 from the tip of the nozzle. Thereafter, the resin composition is cured to obtain a coated mounting structure.
- the coating resin 5 was prepared so that the viscosity after mixing the main agent and the curing agent was 10 mPa ⁇ s to 10 Pa ⁇ s.
- the coating resin 5 applied by the discharge device has a thickness of about 5 to 50% of the portion of the circuit board 1 in contact with the upper surface of the electronic component 2 that is in contact with the upper surface of the circuit substrate 1. preferable. Further, it is preferable that the portion in contact with the upper surface of the circuit board 1 has a film thickness of 5 to 30 times the portion in contact with the side surface of the electronic component.
- the coating resin 5 is applied within 1 hour at room temperature (25 ° C.) after the mixing. When the coating was applied after 1 hour, a good reaction product 8 could not be obtained. When the coating resin 5 is mixed and heated to a temperature higher than room temperature, the reaction is promoted, so that the application time is further shortened.
- the repair work can be easily performed as follows.
- FIG. 3 shows the coating film peeling process in the repair process.
- the electronic component 2 is heated to a temperature higher than the glass transition point temperature of the flux 4, and the coating resin 5 at the portion in contact with the flux 4 around the electronic component 2 or on the side surface of the electronic component is removed. Cut and remove with. Since the coating resin 5 that reacts with the flux is softened by heating, the coating resin 5 can be easily removed and a defective mounting structure can be easily repaired.
- the heating temperature of the electronic component 2 when removing the coating resin 5 is preferably 40 ° C. or higher and 200 ° C. or lower, and more preferably 80 ° C. or higher and 190 ° C. or lower. Since the flux 4 is not softened at a temperature lower than 40 ° C., the peelability is hardly exhibited. In addition, when heated to 190 ° C. or higher, the solder 3 is melted before the coating resin 5 is removed, causing a solder flash, which may cause a bonding failure.
- the remaining part of the flux 4 around the electronic component 2 is made a slit 9 using a spatula or the like as a cutting jig 7 and cut around the electronic component 2 to be integrated with the softened flux 4.
- the coating resin 5 can be peeled off at the interface portion of the circuit board 1.
- the flux 4 spreads around the electronic component 2 and the upper and side surfaces of the electronic component 2 at the time of soldering. Therefore, if a tear 9 is formed around the electronic component 2, the flux 4 can be easily peeled off.
- the electronic component 2 After peeling off the coating resin 5, the electronic component 2 can be easily removed from the circuit board 1 by heating to 250 ° C., which is higher than the melting temperature of the solder 3.
- Example 2 Preparation of coating resin composition
- the coating resin 5 was a two-component urethane resin (SU-3001 (trade name) manufactured by Sanyu Rec).
- the solder cream 6 to be used includes a solder metal and a flux, the solder metal has a composition of Sn-3Ag-0.5Cu, and the flux includes a high boiling point solvent, rosin, activator, thixo material, etc. What was contained was used.
- This CSP is provided with a solder bump (melting point 220 ° C.) at a land pitch (distance between the centers of solder bumps) of 0.5 mm, and has a metal lead portion.
- (Iii) Coating process The said predetermined resin composition was apply
- the joined product of the circuit board 1 and the electronic component 2 to which the resin composition is applied is placed in an oven set at 100 ° C., and heated at 100 ° C. for 5 minutes to cure the resin, and the coated joint I got a thing.
- Comparative Example 1 Comparative Example 1
- a silicone resin was applied to the circuit board 2 on which the electronic component 2 was mounted with a film thickness of 100 ⁇ m and cured at a temperature and time required for curing to prepare a sample of Comparative Example 1.
- circuit board 1 prepared under the same conditions was washed with a washing solution, and after removing the flux 4, the above urethane resin was coated and similarly dried at 100 ° C. for 5 minutes to produce a sample of Comparative Example 2.
- Example and Comparative Examples 1 and 2 the progress of curing was examined by touching the resin surface with a finger wearing a cotton glove and examining whether or not the resin adhered to the glove.
- Example 1 As shown in Table 1, in Comparative Example 1, the resin adhered to the cotton gloves even after undergoing a predetermined curing process at the joint where the flux was present. For confirmation, it was cured at 100 ° C. all day and night, and the finger touch was confirmed in the same manner, but adhesion of the resin was observed. From this, it can be considered that the presence of the flux 4 inhibits the curing and the resin is not sufficiently cured. On the other hand, in Example and Comparative Example 2, adhesion of resin to cotton gloves was not recognized. From this, even if the flux exists, the curing can proceed sufficiently.
- Example and Comparative Example 2 were set in a general-purpose upper and lower hot air rework machine, and the joined portion of the joined body coated with the cured resin composition was heated to 180 ° C.
- the joint reaches 180 ° C., as shown in FIG. 3, a slit 9 is made in the remaining flux portion 4 around the electronic component 1 using a cutting jig 7 to cut the periphery of the electronic component, and the coating resin 5 was peeled off, and the remaining degree of the coating resin was examined.
- Table 2 The results are shown in Table 2 below.
- the denominator of the numbers in the table indicates the area of the cut resin, and the numerator indicates the area where the coating film remains after peeling.
- the electronic component is removed from the circuit board 1 by using a suction nozzle ( ⁇ 8 mm) having a suction force that can be heated to 250 ° C. that is higher than the melting temperature of the solder 3 and lift about 200 g of rubber. It was.
- Table 2 The results are shown in Table 2 below.
- ⁇ indicates that the electronic component can be removed from the circuit board.
- a cross indicates that the electronic component cannot be removed from the circuit board.
- Example and Comparative Example 2 the peelability at the time of repairing the coating film was examined.
- Table 2 in Comparative Example 2, the adhesion between the circuit board and the resin was too high to be peeled off, and the resin remained much.
- the resin since the resin is easily peeled off at the interface of the circuit board by heating, almost no residual resin was observed.
- the electronic component could be removed from the circuit board with the weak suction force of the suction nozzle, but in Comparative Example 2, the electronic component could not be removed from the circuit board. It was. From this, when the coating film applied on the flux is heated, the flux at the interface of the circuit board is softened to facilitate peeling and repair of the electronic component can be performed easily.
- FIG. 4 shows a mounting structure according to the second embodiment.
- Embodiment 1 since soldering was performed using a reflow furnace, the reactant 8 was also formed on the upper surface 2a of the electronic component 2, but the flux to the upper surface of the electronic component 2 as shown in FIG. 4, even when the reactant 8 is not generated on the upper surface of the electronic component 2, the circuit board is formed by the coating resin 5 using the flux 4 and the coating resin 5 of the first embodiment. Even when 1, the electronic component 2, and the solder 3 were covered, it was possible to obtain better repairability than in the past.
- the resin composition for coating of the present invention is suitable in the mounting field where there is a high possibility that moisture will be in direct contact with the circuit board, and is particularly useful in a bonded structure in which an electronic component is surface-mounted on a substrate.
- the present invention is suitable in the mounting field in which a repair operation is performed when an electronic component has a defect, and productivity can be improved.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Non-Metallic Protective Coatings For Printed Circuits (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
Abstract
Description
図1は実施の形態1の実装構造体を示す。
(i)コーティング用樹脂組成物の調製
コーティング樹脂5には、2液性ウレタン樹脂(サンユレック製 SU-3001(商品名))を用いた。主剤のポリオールと、硬化剤のイソシアネートの混合比は、主剤:硬化剤=100:30の割合で使用した。
(ii)電子部品の基体への実装
所定の印刷機、マウンターおよびリフロー炉を用いて、エポキシ樹脂を含浸させたガラス布に銅箔をプリントしたFR-5相当タイプの回路基板に、10mm角のCSP(Chip size package)の電子部品を接合した。このCSPは、ランドピッチ(半田バンプの中心間距離)0.5mmで半田バンプ(融点220℃)を備えたもので、金属のリード部分を備えたものである。
(iii)コーティング工程
回路基板1と回路基板1に実装された電子部品2に、上記の所定の樹脂組成物を2液注型の吐出装置から塗布した。
電子部品2を実装した回路基板2に、シリコーン樹脂を膜厚100μmで塗布し硬化に必要な温度と時間で硬化させ、比較例1のサンプルを作成した。
コーティングの硬化状態を以下の要領で評価した。
図4は実施の形態2の実装構造体を示す。
2 電子部品
2a 電子部品の上面
3 半田(接合金属)
4 フラックス
5 コーティング樹脂
6 クリーム半田
7 カット用治具
8 反応物
9 裂け目
Claims (10)
- 回路基板に電子部品を接合金属で実装した実装構造体であって、
イソシアネートを10~50重量%含み前記回路基板と前記電子部品および前記接合金属を覆うコーティング樹脂と、
水酸基をもつ化合物を含み前記接合金属の表面に残存したフラックスと、
前記フラックスと前記コーティング樹脂の界面に形成された前記コーティング樹脂と前記フラックスの反応物と
を有する実装構造体。 - 前記電子部品の上面および側面にも前記フラックスが配置されている
請求項1記載の実装構造体。 - 前記電子部品の上面と接触する箇所の前記コーティング樹脂の膜厚は、
前記回路基板の上面と接触する箇所の前記コーティング樹脂の膜厚の5~50%の薄さである
請求項1または請求項2記載の実装構造体。 - 前記回路基板の上面と接触する箇所の前記コーティング樹脂の膜厚は、
前記電子部品の側面と接触する箇所の前記コーティング樹脂の膜厚の5~30倍の膜厚である
請求項1~請求項3の何れかに記載の実装構造体。 - 前記反応物は、
前記フラックスのガラス転移点温度以上の温度で軟化する材料である
請求項1記載の実装構造体。 - 回路基板に電子部品をフラックスを使用して接合金属で実装し、
イソシアネートを10~50重量%含むコーティング樹脂によって、前記回路基板と前記電子部品および前記接合金属を覆い、前記コーティング樹脂と水酸基をもつ化合物を含む前記フラックスの界面に反応物を生成する
実装構造体の製造方法。 - 前記コーティング樹脂は、
主剤と硬化剤を混合した後の粘度が10mPa・s以上10Pa・s以下であって、前記混合後1時間以内に塗布する
請求項6に記載の実装構造体の製造方法。 - 前記反応物は、
前記フラックスのガラス転移点温度以上の温度で軟化する材料である
請求項6に記載の実装構造体の製造方法。 - 回路基板に電子部品を接合金属で実装し、前記回路基板と前記電子部品および前記接合金属をイソシアネートを10~50重量%含むコーティング樹脂で覆い、前記コーティング樹脂と水酸基をもつ化合物を含み前記接合金属の表面に残存したフラックスの界面に前記コーティング樹脂と前記フラックスの反応物が形成されている実装構造体の前記電子部品を交換するに際し、
前記反応物を前記フラックスのガラス転移点温度以上の温度にして軟化させて前記電子部品の周囲の前記コーティング樹脂を剥離し、
前記電子部品を前記回路基板より取り外して交換する
実装構造体のリペア方法。 - 前記電子部品の周囲あるいは前記電子部品の側面の前記フラックスと接触している箇所の前記コーティング樹脂に裂け目を形成して、前記コーティング樹脂を剥離する
請求項9に記載の実装構造体のリペア方法。
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EP11795320.8A EP2584602B1 (en) | 2010-06-15 | 2011-04-07 | Package structure and method for manufacturing same |
US13/580,856 US8698005B2 (en) | 2010-06-15 | 2011-04-07 | Package structure, method for manufacturing same, and method for repairing package structure |
JP2012520245A JP5442118B2 (ja) | 2010-06-15 | 2011-04-07 | 実装構造体とその製造方法ならびに実装構造体のリペア方法 |
CN201180004357.1A CN102598252B (zh) | 2010-06-15 | 2011-04-07 | 安装结构体及其制造方法和安装结构体的修理方法 |
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EP (1) | EP2584602B1 (ja) |
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Publication number | Publication date |
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CN102598252A (zh) | 2012-07-18 |
US8698005B2 (en) | 2014-04-15 |
EP2584602B1 (en) | 2017-05-31 |
EP2584602A1 (en) | 2013-04-24 |
JPWO2011158412A1 (ja) | 2013-08-19 |
US20120320539A1 (en) | 2012-12-20 |
CN102598252B (zh) | 2014-12-31 |
JP5442118B2 (ja) | 2014-03-12 |
EP2584602A4 (en) | 2015-06-10 |
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