造纸板块12月15日涨0.6%，民士达领涨，主力资金净流出1.61亿元

Group 1 - The paper sector increased by 0.6% compared to the previous trading day, with Minshida leading the gains [1] - The Shanghai Composite Index closed at 3867.92, down by 0.55%, while the Shenzhen Component Index closed at 13112.09, down by 1.1% [1] - A table detailing the individual stock performance in the paper sector was provided [1] Group 2 - The paper sector experienced a net outflow of 161 million yuan from main funds, while retail funds saw a net inflow of 101 million yuan and speculative funds had a net inflow of 60.78 million yuan [2] - A table showing the fund flow for individual stocks in the paper sector was included [2]