Debarking degree: amount of bark on

Debarking degree:

amount of bark on chips / surface cleanness of logs

typical values:
• softwood pulp 0,5 % / 95%
• hardwood pulp 1,0 % / 90 %
• TMP 0,1 % / 99 %


Wood losses are stressed by:

• long retention time

• high drum filling degree

• high drum rotation speed

• wood properties

- small diameter

- rotten wood

- dry wood

- mixed diameter

- mixed length

• Debark logs. Logs are rubbing against each others
• Remove bark from log flow

CHIP QUALITY CONTROL:

• Uniformity and freedom from contaminant
• Important of sampling
• Laboratory test: MC, size distribution, and bark, rot and dirt content
• Uniformity:
• 10 – 30 mm long; 3 – 6 mm thick good quality chips
• Contaminants:
• Oversized; pin chips; fines; bark and rotten wood; dirt and foreign material

Results (Indonesian) 2:

Debarking derajat:

jumlah kulit pada chip / permukaan bersih dari log

nilai-nilai khas:
• bubur kayu lunak 0,5% / 95%
bubur • kayu 1,0% / 90%
• TMP 0,1% / 99%


kerugian Kayu tertekan oleh :

• waktu retensi yang lama

• Drum tinggi tingkat mengisi

• kecepatan putaran drum yang tinggi

sifat • kayu

- diameter kecil

- kayu busuk

- kayu kering

- campuran diameter

- campuran panjang

• Debark log. Log bergesekan satu sama lain
• Hapus kulit kayu dari log aliran

CHIP PENGENDALIAN KUALITAS:

• Keseragaman dan kebebasan dari kontaminan
• Penting sampling
• Uji Laboratorium: MC, distribusi ukuran, dan kulit, busuk dan konten kotoran
• Keseragaman:
• 10 - 30 mm panjang; 3 - 6 mm tebal baik kualitas chip
• Kontaminan:
• Oversized; pin chip; denda; kulit kayu dan kayu busuk; kotoran dan bahan asing