在计划经济时期，肠衣是国家有计划的出口物资，各地原料由国家统一购销，不准自由买卖。虽然如此，顺平县境内的肠衣加工也没有中断，并且利用“残货”、“次色”等下脚料进行再加工。1958年县皮革社用肠衣残次品试制鞭弦，开辟了肠衣残次品的新途径。
In the period of planned economy, casings are the export materials planned by the state. The raw materials in different regions are purchased and sold by the state in a unified way, and are not allowed to be traded freely. In spite of this, the casings processing in Shunping County has not been interrupted, and reprocessing is carried out with leftovers such as "leftovers" and "secondary colors". In 1958, the trial production of whip string for the defective casings by the county Leather Association opened up a new way for the defective casings.
60年代初期，村办集体企业开始发展。顺平县石家庄村、北吴村、北城村等都建立了制弦厂，以羊肠衣生产弹花弦、球拍（网球拍）弦、板胡弦、鞭弦等，并辐射到全县，发展到近百家。产品主要销往辽宁、安徽、江苏、浙江、湖南、湖北等省。70年代初，顺平县河口公社康各庄大队首先开始生产肠衣新产品——套管，通过秦皇岛口岸出口。
In the early 1960s, rural collective enterprises began to develop. In Shijiazhuang village, Beiwu village and Beicheng village of Shunping County, string factories have been established to produce spring string, racket (tennis racket) string, Banhu string and whip string with sheep casings, which have spread to the whole county and developed to nearly 100. Products are mainly sold to Liaoning, Anhui, Jiangsu, Zhejiang, Hunan, Hubei and other provinces. In the early 1970s, kanggezhuang brigade of Hekou commune of Shunping County first began to produce casing, a new casing product, which was exported through Qinhuangdao port.