Study of the effect of adding sodium cellulose from сannabis straw to the composition of packaging types of paper

The purpose of the work is to obtain samples of packaging types of high-strength paper and cardboard due to the use of cellulose from technical hemp bonfire in a composition with MС-5Б waste paper. The technical hemp bonfire is comparable to hardwood in terms of its main components, but it has a high ash content. Natron cooking of cannabis fires was carried out under the following conditions: consumption of NaOH in units of Na2O – 18...30% of a.s.s., hydraulic module – 5:1, temperature rise to 170°C – 60 min, cooking time – 60 min. With an alkali consumption of 18% NaOH, cellulose contains up to 18.6% unwanted inclusions, and the mass fraction of lignin is 16.1%. At a consumption of 24% NaOH there is no unwanted inclusions, the yield corresponds to hard sulfate cellulose. With an alkali consumption of 30%, the yield is reduced to 43.2%. In further studies, cellulose obtained by the second cooking mode was used. Cardboard liner samples (cardboard for flat layers of corrugated cardboard) made of 100% waste paper and with 25% cellulose from the bonfire did not reach the required ring compression index for grades K-0 and K-1. At 40, 75 and 100% of the fires, the indicators correspond to the norms: fiber fires are tougher than waste paper. The analysis of the results of measuring the physico-mechanical parameters of paper samples for corrugation was as follows: with an increase in the proportion of pulp from the hemp bonfire, the strength of the paper increases, but over 50% the increase in the specific resistance to rupture stops, and the resistance to planar compression decreases. Optimal compositions – 50% waste paper + 50% bonfires (corresponds to the B-1 brand and cardboard not lower than K-0) and 25% waste paper + 75% bonfires (exceeds the requirements for the B-0 brand).

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