FIELD: pulp and paper industry.
SUBSTANCE: invention relates to the pulp and paper industry and concerns a method of controlling retention on a forming fabric in a papermaking process and an intermediate product, used in the method. For making the intermediate product at least one paper making chemical is added to a suspension, which is a hydrophobic adhesive substance, such as alkyl ketene dimer (AKD) or alkenyl succinic acid andydride (ASA), specific surface area of those fibres being larger than that of the fibres of the main fibrous suspension for paper making, causing the paper making chemical being adsorbed on the fine cellulose fibres. Then this intermediate product is incorporated in the main fibrous suspension before the suspension is supplied from the paper machine head box to the forming fabric.
EFFECT: invention provides an improved total retention, as well as an improved control of retention of the chemical agents for making paper separately and/or inter-operatively.
17 cl, 2 ex
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