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TWELL Electronics

       Kunshan SJ Electronic Scince&Technology Co., Ltd(KSSJ) originated from Shanghai YKC Circuit Board Co., Ltd. It was a joint venture between Shanghai Jinling Co., Ltd. and Japan YKC Co., Ltd. It mainly produces and sells single and double-sided board, carbon film board, carbon & silver paste through-hole board, carbon  & silver cross over board , mainly for the world-famous enterprises of Japan and the United States. In 2011, the company began to transform and restructure and successively extended sales companies and factories,such as Shanghai Twell Circuit Technology Co.,Ltd(TWELL)、 Hong Kong SJ Techonogy Limited.(HKSJ)、Kunshan SJ Electronic Science & Technology Co., Ltd(KSSJ).Kunshan SJ Electronic Science&Technology Co., Ltd(KSSJ) mainly produces all kinds of high and low resistance carbon film boards. The products are used for all kinds of automobile switches and air conditioning damper actuators、speed...

The enterprise culture

Grow together with partners and create a better company to bring a better future
Become the industry leader trusted by customers
Sense of worth
Gratitude, integrity, progress, cooperation and innovation

Product center

Manufacturing process

  Double-sided board process flow (e.g. HASL surface treatment):

Board cutting---Drilling---Horizontal through-hole (conductive polymer film)---Electroplating (VCP one-time copper plating)---Outer layer production (dry film, etching)---Outer layer AOI inspection (semi-finished product inspection)---Solder Mask---Text-printing--- HASL---Forming (milling, V-CUT, finished product cleaning)---Electrical logging (finished product inspection)---FQC (visual examination)---Packaging---Entering warehouse

Enterprise characteristics

48 hours Regular PCB shipment 3 days Carbon film sample shipment 5 days PCBA sample shipment
24 years of technology and experience accumulation

The life of carbon film can reach 1 million times, the linearity tolerance of carbon film can reach 1%, and the flexible carbon film plate can be made

R & D supporting capacity of high-tech products

It has the purchasing channels of special materials, Conductive paste and equipment, core patented technology, and continuous research and development of new processes and product

Core brand technology

One stop supporting, PCB design, production, carbon film processing, component purchasing, SMT/DIP processing

Excellent Quality and quick response

Mature quality management team, provide project leader for core customers, ensure quality and fast service

Production equipment


GM Volkswagen Great Wall Motor red flag Ford Dongfeng Motor China FAW BAIC Group METHODE ELECTRONICS,INC. MARQUARDT AUTOSPLICE Beyonics Auto parts customers CHANGHUI PANINCO

News center

26 2019-11
Insiders: PCB evictions have

From 2016 to 2019, due to the increasing productio

30 2019-10
Talking about PCB printed circuit board cleaning

When the layout and wiring of a PCB board is compl

15 2019-10
There are several methods for PCB multilayer surface treatment?

Hot air leveling process of molten tin-lead solder

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