Introduction

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...

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

Double-sided board process flow Multi-layer board process flow Carbon film board

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