看天堂-看特级毛片-看特级大黄一片-看全色黄一级毛片-看全色黄大色黄女视频-看全色黄大色黄大片视频

Welcome to the official website of Shenzhen Ledfocus Precision Manufacturing Co., Ltd.!
News
News
Hot products

Service Hotline

0755-29727486 0755-83734215 0755-83734236
Industry news

Where are you now:Home >> News >> Industry news
What are the important materials for SMT chip processing?
Time:2022-02-22 Read: 2210

Today, Lexus will give you some knowledge about important materials for SMT chip processing.


1. SMT chip processing technology solder paste


Solder paste is a paste made of alloy solder powder and paste flux evenly stirred. It is an indispensable welding material in SMT chip processing technology and is widely used in reflow soldering. Solder paste has a certain viscosity at room temperature and can initially stick electronic components to predetermined positions. At the soldering temperature, as the solvent and some additives evaporate, the components to be soldered and the PCB are connected to each other, forming a connection.


Most of the current SMT placement machines use the wire stencil printing method to apply solder paste, which is easy to operate and can be used after fast printing. However, it is also difficult to ensure the reliability of the solder joints, which is easy to cause virtual soldering, waste of solder paste, and high cost.


2. SMT chip processing technology chip adhesive


SMD glue, also known as SMT glue, SMT red glue, is usually red (also yellow or white). Adhesives such as hardeners, pigments, solvents, etc. are evenly distributed in the slurry, which are mainly used to fix components on the printed board. It is generally distributed by dispensing or stencil printing. After the components are pasted, they are placed in an oven or reflow oven to heat and harden.


Different from solder paste, the patch adhesive is cured after heating, and its freezing point temperature is 150°C, and it will not melt after being heated again, which means that the thermal hardening process of the patch adhesive is irreversible. The application effect of SMT glue will vary depending on the thermal curing conditions, connection objects, equipment used, and operating environment. When using SMT adhesives, the adhesive should be selected according to the PCB and PCA process.


3. Flux for SMT chip processing technology


Flux is the carrier of solder powder, and its composition is basically the same as that of general flux. In order to improve the printing effect, it is sometimes necessary to add an appropriate amount of solvent. Through the action of the activator in the flux, the solder can quickly diffuse through the oxides of the solder powder itself and adhere to the surface of the metal to be soldered. The composition of the flux plays a decisive role in the expansion, wettability, collapsibility, viscosity change, cleanability and shelf life of the solder paste.


Contact Us
Shenzhen Ledfocus Precision Manufacturing Co., Ltd.

Address: Room 1204, Dahong (Xinqiao) Science and Technology Innovation Park, No. 48, Xinyu Road, Shajing Street, Baoan District, Shenzhen

Phone: 0755-29727486 0755-83734215 0755-83734236

Person in charge: Mr. Fan 13088821718

Email: roman@leikashi.com

Business section #605

Email: allen@leikashi.com

Website: m.65874.cn

Service hotline
0755-83734236
? 2020 Shenzhen Ledfocus Precision Manufacturing Co., Ltd. All rights reserved 粵ICP備2021139374號
  • Links:
主站蜘蛛池模板: 亚洲欧美在线观看一区二区 | 日韩二三区 | 国产成人精品一区二区阿娇陈冠希 | 欧美日韩精品一区二区三区高清视频 | 国产精品秒播无毒不卡 | 日韩制服丝袜在线观看 | 国产成人综合久久精品红 | 欧美激情影音先锋 | 亚洲免费福利视频 | 把内裤拔到一边高h1v1 | 成人看片免费无限观看视频 | 亚洲10p| 99国产情在线视频 | 青青草国产精品久久碰 | 亚洲精品中文字幕久久久久久 | 5g影院成人 | 国产精品久久久久影视不卡 | 国产码一区二区三区 | 日本在线视| 好姑娘完整版在线观看中文 | 95视频免费看片 | 菠萝视频5正版在线观看 | 久久91精品国产91久久户 | 韩国久播影院理论片不卡影院 | 日本69av| 久久免费看少妇高潮A片JA | 青青草原国产一区二区 | 国产精品www夜色影视 | 久久这里有精品 | 国产午夜小视频 | 欧美一级片在线视频 | 99久久中文字幕伊人 | 国产精品久久久久久吹潮 | 办公室强行丝袜秘书啪啪 | 华人在线视频 | 成人免费毛片一区二区三区 | 色偷偷亚洲男人 | 亚洲人成激情在线播放 | 99亚洲自拍| 九九精品影院 | 日本红怡院亚洲红怡院最新 |