????:2024-12-27 06:08:55 ??:????
????:??????:??????????
?????????????????????????????????????????,?????????“???”???????????,?????,?????“????????????”??,???,???????????????????????????,??????????????,?????,12????????????????????26?????,????????????????????????????
???????????????,?????,??????????????“???????????????????????????????”?????????,???,??????????????????????????GB 4806.7-2023«?»????????????????????????????“??????”??,????????????,???,???????????????,???????????,??????????????
???????????????????,?????????????????PE???????LDPE?????????PVDC????????????????????PVC???????????,????????????,?????????????,???????????????????????
??????,??????????????:PE?????????????????>PVDC??>PE??????????>PVC?????????????????:PVDC?????????????????>PE????????????>PVC?????????>PE????????>PE???????????,??????????????????,???????????,???????????????????????????;?????????????????????????????????(?????),???,???
?????????????,??????????????????????,???????????????????,??,?????????????????,????????????????????????????????,????????????????,?,?????????????,?????PVC?????????,????????????,?????????,????(???) ???:???????????????
????