Can starch be used in topcoating?, 2010 TAPPI Advanced Coating Fundamentals Symposium



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Three pigment systems (two GCC/ultrafine kaolin blends and 100% ultrafine GCC) have been applied to a commercial precoated woodfree base using a range of starch and latex combinations. This has allowed the determination of the combinations that produce the same offset printing strength, as measured by dry pick. All of the coating paper and print properties measured can then be assessed at these constant strength combinations. This means that it is possible to determine if the quality is acceptable when trying to reduced costs by utilising higher levels of starch in topcoating. There is also evidence that the presence of kaolin and the use of GCC with different particle sizes can have a significant affect on the starch to latex levels required to achieve the target dry pick values. Although there is a different balance of properties, the use of 100% ultrafine GCC is a viable alternative to the traditional fine GCC/ultrafine glossing kaolin.

Author: Anthony Hiorns
Can starch be used in topcoating?, 2010 TAPPI Advanced Coati
Can starch be used in topcoating?, 2010 TAPPI Advanced Coating Fundamentals Symposium
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