Meltblown daim ntaub cua sov tube blackening kev kho mob

1. Ua ntej ntxuav qhov chaw ntawm cov yeeb nkab hlau kom huv si;

2. Qhov thib ob yog kev kho degreasing saum npoo, cov txheej txheem no tuaj yeem tso cov raj hlau rau hauv cov tshuaj degreasing. Tus nqi PH ntawm cov tshuaj degreasing zoo dua li ntawm 13, thiab lub sijhawm tsis pub tsawg tshaj li ib nrab teev. Yaug nrog dej huv tom qab degreasing.

3. Tom ntej no, pickling tuaj yeem nqa tawm. Tus nqi PH ntawm cov tshuaj pickling yog li 3, thiab lub sijhawm ua haujlwm yuav tsis pub ntev tshaj 10 feeb. Tom qab pickling, ntxuav nrog dej huv;

4. Blackening kev kho mob: qhov concentration ntawm cov kua pas dej yog nyob nruab nrab ntawm 2-4 thiab lub sij hawm kho yog li 10 feeb. Tom qab blackening, nws yog heev huv si;

5. Thaum kawg, ziab thiab oiling;