Friday, February 6, 2009

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.


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Anonymous said...

How can CMT be influenced at the pond size press in 100% recycled liner and flutting? viscosity or solids of the starch?