Zhu, who was engaged in Wujin paper production in the 1940s, moved back to his hometown in Songxia from Shimen Town, Tongxiang County (now Tongxiang City) and started Wujin paper family workshop to make a living. After the founding of New China, relatives and neighbors were recruited as workers, and gradually developed and expanded, so Songxia Town had Wujin paper manufacturing industry. After that, it gradually weakened, and after the investigation, it was excavated again.

The production technology of Wujin Paper Industry is very complicated. It takes three links and many processes to make an ordinary yellow paper into excellent black paper. Each working procedure should be carried out in strict accordance with the operating procedures, so as to be strong, cautious and light. The so-called "three links", first of all, through dipping, collecting, drying, clamping, separating, knocking, uncovering and cutting to prepare yellow paper for the subsequent process; The second is to make the ink of smoked paper, which is made through the processes of smoking coal, scraping coal, steaming cowhide paste, smoking and drainage; The third is to brush coal, dry, separate paper, knock paper, grab paper, point paper and cut paper on the prepared yellow paper to complete the whole operation.

Wujin paper is mainly used to pave the way for gold, silver and aluminum foil. Perforated gold, silver and aluminum foil sandwiched with black paper are used as manufacturing trademarks by many factories. Songxia Wujin paper has the characteristics of tough and thin paper, even ink without spots and black and bright color, so it has always been favored by related manufacturing industries inside and outside the province and even abroad.