紙筒蓋 紙筒塑料蓋 紙筒封蓋 塑料蓋子用于紙管/紙筒/塑料圓管端口密封包裝,防止筒內(nèi)裝物件跌落,扣入管口即可,應(yīng)用于小型工藝品,機(jī)械零件等紙質(zhì)或塑料管封蓋。內(nèi)蓋常用規(guī)格有30,40,50,53,60,63,65,73,76,83,88,99,101,105,114,127,152mm(2寸,2.5寸,3寸,3.5寸,4寸,4.5寸,5寸,6寸)