Análise do teor de agente deslizante e a influência da temperatura de processamento em filmes flexíveis para embalagens

Abstract

Flexible polymeric films are responsible for a large part of the plastic transformation market and make up a range of products that are very present in in people's lives, such as bags, food packaging and disposable materials. In order to facilitate the sliding of the films in production, slip agents are added to the extrusion so that the coefficient of friction (COF) of the films is low enough to have a good productivity. The objective of this work, when analyzing the sliding agent content and the influence of the processing temperature in flexible packaging films, is to understand how the migration of this type of additive to the surface of the material can affect its post-processing behavior. To characterize the surface of the film, the measurement of the contact angle by the sessile drop in 06 different samples was used, varying between them the percentage of additive (0% as reference, 2% and 4%) and the processing temperature (190ºC and 220ºC on average), and it was noticed that when working with a slightly higher profile of extrusion temperatures and with a higher concentration of slip agent, we can obtain a film with greater dimensional stability and better processability. However, in terms of cost reduction, it is observed that it is possible to add 2% of slip agent and obtain relatively low COF values, being able to increase both the extrusion processing window and the machinability of flexible films.