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Converting StandardsCosts for Ink coverageMEMBER'S QUESTION: I was wondering if we had any idea of the average cost of ink per MSF .Not sure if this the data would be collected from converters in Canada or the USA. ....just wondering... thanks in advance... ASK!Ralph RESPONDS: While I am still waiting fro input from other network associates here is what I have so far. Typical ink costs are as follows: We calculate 1lbs./1000 sq. ft. for high hold out surfaces and 2lbs./1000 sq. ft. for kraft or absorbent paper stocks. Many variables enter into an ink usage calculation depending of the substrates, drying mechanisms, anilox roll line screen, ink metering systems, plates and press speed. These numbers are averages. You do the math!
Containerboard and Combined Board TemperaturesMEMBER'S QUESTION; What are the proper containerboard and combined board temperatures as they make their way through the corrugating process?
ASKRALPH RESPONDS: Here is the temperature information that you will need to monitor the process. The absolute temperatures are critical, but so are the differences across the machine. If the sheets are not “heating up” uniformly then one can experience difference in the combined board tests. You may also want to review the information in the April 19, 2008 edition of OBM. See page 4.
What is the UN Cobb Requirement?MEMBER: We have had issues bonding liner from one particular mill. We have reversed the roll on the rewind stand and still have not been able to develop an adhesive bond. We have spliced in rolls from other mills and they combine well on the corrugator. We have therefore concluded that there are no issues with our starch or corrugating procedures. We contacted the problem mill and were told that our rolls were produced in a production run were sizing was used so the the linerboard would meet the UN Cobb Test. Will you please explain this to us?
How does the caliper and weight change on board that is wax impregnated and coated with a waterproof adhesive?MEMBER:I have a question concerning how the caliper & weight change on board that is wax impregnated & coated with a waterproof adhesive. The board in question is 350BC (42-33-42-33-42) with all mediums & liners wax impregnated & the liners coated with waterproof adhesive. Thank you for your time & any information you can offer.
Runnability Issues With Highly Sized LinerMEMBER: We have had issues bonding liner from one particular mill. We have reversed the roll on the rewind stand and still have not been able to develop an adhesive bond. We have spliced in rolls from other mills and they combine well on the corrugator. We have therefore concluded that there are no issues with our starch or corrugating procedures. We contacted the problem mill and were told that our rolls were produced in a production run were sizing was used so the the linerboard would meet the UN Cobb Test. Will you please explain this to us? RALPH YOUNG: The UN Cobb requirement establishes a maximum amount of water absorption on the outer liner of a converted box. You mill may have used either too much sizing or tried a different sizing. In either case I would ask that mill what the absolute grams of water absorption was on the finished linerboard for that particular production run. You may also want to ask the mill about its porosity values for that production. If you had combining issues, others may also be having issues. Linerboard with sizing can with time continue to increase it's moisture hold out and porosity. Check the age of the rolls.
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