塑料板块12月22日涨2.93%，神剑股份领涨，主力资金净流入10.79亿元

Group 1 - The plastic sector increased by 2.93% compared to the previous trading day, with Shenjian Co. leading the gains [1] - The Shanghai Composite Index closed at 3917.36, up 0.69%, while the Shenzhen Component Index closed at 13332.73, up 1.47% [1] - Key stocks in the plastic sector showed significant gains, with Shenjian Co. rising by 10.04% and closing at 66.8, and other notable performers including Xingye Co. and Dongcai Technology [1] Group 2 - The plastic sector experienced a net inflow of 1.079 billion yuan from main funds, while retail investors saw a net outflow of 303 million yuan [2] - Major stocks in the plastic sector had varying performances, with some stocks like Ruihua Tai and Bofei Electric experiencing declines of over 8% [2]