Establishing assessment guideline for de-inked pulp by sharing roles fulfilled by

International Standards and regional certifying bodies

Dr. SHIMIZU, Hirokazu Visiting Senior Researcher, Waseda University Environmental Research Institute

President, SHIMIZU PRINTING INC. Observer, ISO TC130 WG11 (Environmental impact of printed products)

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Purpose of standardization

1. Classify quality levels of de-inked pulp

• De-inking related to the standard can separate and collect de-inked

materials (with labeling system) for different purposes of application

since each kind of paper requires different levels of de-inking levels

2. Suppliers push ahead with their research and development

• De-inking related to the standard can lead paper and ink

manufacturers to make more efforts to produce new products which

are developed with consideration for de-inking

3. Print-buyers can be guided to the right path

• De-inking related to the standard can educate print-buyers and

printers to shift their materials from normal ones to de-inking friendly

ones because they should care consumer’s reputation

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Specific contents of standardization

1. Sharing roles by ISO and regional certifying bodies

• ISO outlines testing procedure (parameters, calculation for evaluation);

regional certifying bodies fix de-inking level (recycling grade) tailored

for local de-inking skill

2. Material oriented system, not product oriented system

• De-inking evaluation should be done based not on printed products,

but on printing materials (offset-ink, digital-ink, hot-melt, hot/cold-

stamp, varnish, surface coating…etc)

3. Detailed testing procedure as mixture of existing codes

• De-inking testing procedure should be schematized as compromised

proposal by European method, Japanese method and ISO codes by ISO

TC6 (Paper, board and pulps)

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Sharing roles by ISO and regional certifying bodies

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Printing samples Print Bk at the density of 1.XX on fine paper

Ageing ?????????

Defibration X% NaOH, X% De-inking agent…etc.

Storage ?????????

Floatation C=X.X%, T=XX℃, Air X-litre/min.

Luminosity Evaluated on 1 to 4 point scale for brightness (glossy point up to 100)

Color Evaluated on 1 to 4 point scale for red-green (-X.X～+X.X on “a” axis on Munsell color system)

Cleanliness Evaluated on 1 to 4 point scale for dirt spec (size of dirt spec=0.0Xm㎡)

Scoring the result and evaluate de-inking levels Overall point by the sum of “Luminosity”/ “Color” / “Cleanliness” can indicate de-inking levels

<Procedure to make “dried hand sheet”>

<Parameters to evaluate de-inking status>

Framework prepared by ISO

Detailed evaluation by regional certifying body

Discussion

1. Testing procedure and Parameters (middle ground of Europe and Japan should be found)

• Detailed procedures to be aligned, Luminosity/Color/ Cleanliness and more?

2. Scoring calculation • Form JointWG with ISO TC6 and create new method?

3. Certification for testing institutions • Testing labs should be certified? Who could be evaluator?

4. Utilization of existing ISO rules • Form JointWG with ISO TC6 and and create new method?

5. Labels • Separated collection of recycled paper products/wasted

paper could be assisted by labels?

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