Concora Tests in Corrugating Medium

Concora Test is one of the testing methods that widely used in Corrugating Medium. There are two kinds of concora tests; CFC (Concora Fluted Test) which mostly influenced by sheet MD strength and CEC (Concora Edge Crush), which mainly influenced by sheet CD strength.

Since the Concora flat crush is mostly effected by machine direction strength and the Concora edge crush is most effected by the cross machine direction strength, anything we do which increases M.D. of C.D fiber orientation will help one test and hurt the other.

Described below is some ideas on how to improve the regular CFC test but also includes some information on how to improve the CEC test:

1. OCC furnish quality
   - Minimize OCC contaminants; soft whites, core stock scrap, Asian OCC, cuttings from box plants using primarily recycled fiber in OCC, waxed boxes
   - Minimize degradation of OCC by exposure to water and to sunlight


2. Refining
   Refine incoming stock at neutral to alkaline pH
   Do a low intensity refining
   Maximize consistency through refiners
   Run refiners in series


3. Wet-End section
   Get optimum MD/CD orientation across machine width
   Run at lower headbox consistency


4. Press Section
   Maximize Press loading, especially after the first press


5. Dry end Section
   Run at maximum basis weight (reasonable)
   Run with lower sheet moisture


6. Chemical Additives
   - Increase cationic starch dosage (careful to over-cationization potential). Change to Amphoteric starch and we will be free to add more dosage without over-cationization potential.
   - Use Dry Strength Additives; Glyoxylated PAM will normally increase concory by creating covalent bond.

146 Small Papermaking Factories in China Shut Down

Based on the news released by chinacsr.com dated April 5, 2007, Hunan Province has shut down 146 small papermaking factories that failed to meet standards on pollutant emissions.
The factories all circle Dongting Lake. The region around Dongting Lake is rich in forests, which provide abundant productive materials for local papermakers. However, with a huge profit, these factories also brought unexpected side effects on the environment. According to Hunan Environmental Protection Bureau, the factories have emitted over 1.7 billion tons of wastewater into the lake.
In a circular released at the end of 2006, the provincial government regulated all papermakers and said they must install soda recovery units and ensure wastewater within allowed standards before a March 31 deadline. These 146 failed to meet the stated standard and have therefore been shut down.**

**taken from chinacsr.com