Within a global market for printing and writing that is at best flat, consumption of paper for coated reel-fed (high speed) inkjet is growing. Growth is driven by the potential to print on demand, reducing the need for high inventory of printed material and making it possible to personalise the content. The rate of growth and ultimate target market size is widely debated by analysts and commentators, with the key difference being whether coated inkjet can also take market share in coated magazines from traditional offset printed grades.
One of the most significant hurdles to delivering mass commercialisation of coated inkjet paper for magazines is the availability of a cost-effective paper substrate in a range of grades which has the look and feel of traditional magazine paper. This is because making good quality inkjet-compatible coated paper is challenging. In terms of mineral components, silica or surface modified mineral pigments are typically used to create a suitable pore structure that enables sufficient capillarity to give fast removal of the fluid components of the ink together with large pores to enable drainage of the ink volume. These types of mineral pigments are typically expensive compared to traditional coating pigments and inherently require low application solids which can prevent high speed coating. Other existing solutions are based on a cationically-charged formulation to help fix the ink close to the paper surface. This causes problems on paper machines that spend most of their time producing under anionic conditions. As a result, the papermaker must take great caution to avoid any contamination when switching between production runs.
IMERYS has been working to overcome these issues in order to assist the papermaker in bringing to market a formulation that could genuinely make mass adoption of coated inkjet paper a reality. Our philosophy has been to concentrate on more traditional mineral pigment types from our extensive portfolio of materials and grades to enable high application solids and to maintain anionic formulation chemistry, reducing the pressure on the papermaker who wants to produce in campaigns. To make this possible, it has been necessary to develop a full-formulation understanding for this concept.
In this paper we will expand on our view of the coated inkjet market, its size and technical needs. We will introduce the techniques that we have developed for characterising these papers and share application data of our proposed formulation concept, benchmarked against appropriate commercial grades.
View full abstract