Products, 06-12-2024

Unwanted halogen-based substances in paper: MARE S.p.A.’s approach and the use of CMC

Ensuring compliance with regulatory requirements is an increasingly important factor in paper production processes.

In particular, the presence of 1,3-dichloro, 2-propanol (DCP) and 3-monochloropropane-1,2-diol (3-MCPD) is meticulously monitored for tissue paper products. In this branch of the tissue industry, polyamidoamine-epichlorohydrin wet strength resins (WSR) are widely used for the development of moisture resistance.

How to counter unwanted chemical compounds that contain halogens

It should also be noted that DCP and 3-MCPD are part of a larger family of unwanted substances, referred to under the generic term AOX/OX, i.e., halogenated organic chemical compounds that are adsorbable on specific activated carbon.

The final level of AOX/OX generated in order to produce a roll of kitchen paper depends not only on the WSR application process but also on other factors within the production stages.

Conducting comprehensive studies on these aspects requires challenging technological resources and close collaboration between various stakeholders. Mare S.p.A. has all the analytical tools as well as the necessary experience to conduct this type of analysis in order to define possible sources and quantify their contribution.

Mare’s commitment to tissue paper production

Mare S.p.A. uses an integrated approach, which begins with in-depth research, both synthetic and analytical, that focuses on fostering continuous improvements in both technology and production.

This allows the company to offer WSR products that are constantly cleaner and more efficient as production technology improves.

In this regard, the collaboration between Mare S.p.A.’s research department and the Politecnico di Milano is fundamental, especially in the study of the kinetics of the undesirable reactions of epichlorohydrin.

Use of CMC

When it comes to the application process, expertise is equally essential. Indeed, the characteristics of the fibres used are the starting point for design and implementation.

For example, the well-defined use of carboxymethylcellulose (CMC) creates significant synergy with the WSR applied, allowing for increased moisture resistance.

This can lead to the optimization of WSR dosing and, consequently, better control of AOX/OX residues, as well as application costs.

In certain cases, the use of Mare CMC-based products resulted in WSR-dosage reductions of up to 40%.

Continuous monitoring

Continuous monitoring of the paper production process is essential to achieve and maintain certain results. Uncontrolled variations of different chemical parameters in the cycle (pH, conductivity, cation demand, zeta potential, etc.) can negatively affect WSR performance as well as the final level of paper contaminants.

Treatments other than those based on WSR can generate AOX/OX on paper in larger quantities than those produced by resin.

Thanks to its team of expert technicians, distributed throughout the country, and the analytical-instrumental support of its specialised laboratory, Mare can offer, in combination with a chemical programme, an on-site monitoring service at the customer’s place of business, alongside a pollutants analysis service on the finished paper product and process water.

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