FRET - Handsheet Retention Tester
02 กุมภาพันธ์ 2566
ผู้ชม 126 ผู้ชม
Principle
The upper tank of the retention tester is designed for complete pulp shearing and
offers an ideal point for manual or automatic additive injection and mixing under
industrial conditions with regards to strength and time.
This upper tank, also known as the first stage, simulates the feed circuits of a typical
paper machine :
- The suspension is then transferred in the formation tank.
- After a rapid homogenization of the suspension using air blown through the wire, a strong vacuum is introduced on the pulp to drain the sheet of excess water.
- A vacuum curve is calculated on the drainage time and pressure. This second stage simulates the head box, table and the drainage part of the paper machine.
- The lower tank can be opened to recover the sheet.
- White water is totally retained in a jar inside the Fret for analysis or recycling.