Індекс рубрикатора НБУВ: У9(4УКР)307.985

Рубрики:

Економіка окремих країн і частин світу

Шифр НБУВ: Ж25522 Пошук видання у каталогах НБУВ 

Індекс рубрикатора НБУВ: Л914

Рубрики:

Перероблення ягід

Шифр НБУВ: Ж24320 Пошук видання у каталогах НБУВ 

The main aspects of quality assessment of moisture-resistant waterproof paper are considered. The results of expert evaluation of the advantages of the developed moisture-resistant waterproof paper packaging materials over the analogue material are presented. The complex indicator of quality of the developed moisture-resistant waterproof paper packing materials is defined.

A high level of barrier and protective properties, resistance to moisture penetration (water, steam) and air resistance are the main requirements for packaging paper for food products. Polyvinyl alcohol-based polymer coatings are widely used for packaging paper; however, such coatings tend to have poor water resistance due to the hydrophilic and water-soluble nature of polyvinyl alcohol. Polyamide-epichlorohydrin resins are used to provide moisture resistance of the paper, and glycerol is used for the elasticity of the coating. At the same time, the complex effect of these components in the mixture for surface treatment of paper on the quality of the products has not been sufficiently investigated. Compositions based on aqueous solutions of polyvinyl alcohol brand 7/18 of the highest grade, polyamideamineepichlorhydrin EKA WS 325 and glycerol brand PK-94 were used to obtain a moisture-resistant, waterproof and fat-proof packaging material. Polyacrylamide in the amount of 0,25 wt. % was used as a functional additive, a viscosity regulator of the composition, and water was used as a solvent. Model compositions with different ratios of the main components in accordance with the central composite rotatable plan of the experiment were applied to the tests according to the methods adopted in the pulp and paper industry. STAT-SENS software was used for mathematical processing of the experimental results. A multi-criteria optimization method was used to find the optimal range of parameters of the hydrooleophobic composition. The 15 model compositions have been developed. The influencing factors were the content of the polyvinyl alcohol, polyamideamineepichlorhydrin, glycerol. The quality indicators of the treated paper-base were selected as the response functions of mathematical models: oil permeability, air permeability, destructive force, moisture resistance, surface absorption. Conclusions: the developed composition is optimal and makes it possible not to exceed its consumption during application to fibrous material, in particular paper. The composition penetrates the thickness of the paper to an optimal depth evenly over the entire surface of the paper, which makes it possible to provide the paper with uniform barrier properties, mechanical strength and wet-strength along the plane of the canvas. In addition, glycerol gives elasticity to the resulting coating and prevents it from cracking during repeated bending.