THERMAL SEAL FORCE OF COATED BIDIRECTIONAL STRETCHED PET FILM USED IN FOOD PACKAGING INDUSTRY

In addition to the mechanical and permeability properties of food packaging, heat sealing ability of packaging is critical in order to protect a product and extend its shelf life. Optimum temperature sealing is an essential necessity in the packaging industry. Important control parameters for bonding are jaw temperature, jaw pressing time and jaw clamping force. Sufficient pressure must be applied to the surfaces to achieve acceptable adhesion. The physical evaluation of an adhesion can provide a useful qualitative indicator of the effectiveness of the heat sealing process and is based on optimization of the parameters of dwell time, temperature and process pressure. The purpose of this work is to define the effective jaw heat and compression time for the seal strength of the surface coated PET film to the APET surface. The analysis of the thermal adhesion performance of the copolyster surface coated biaxially oriented PET (BOPET) film is brought to the literature. It will guide the determination of the process conditions of the packaging machine to be used after the film production in the sector. Thus, it will contribute to production and energy efficiency as there will be analyzed data about the required jaw temperature, jaw pressing time and pressing force in packaging machines. The effects of parameters on the seal strength were analyzed using the Box-Behnken design, which is a response surfaces methodology (RSM). Then, the significance of the variables was examined by regression analysis. In the study, the correlation coefficient value was 0.995 and it is seen that the model represents 99.5% of the experiments. The most effective factor determined at the 0.05 statistics significance level was jaw temperature.

Keywords:

BOPET, Box-Behnken Experiment Design, Response Surface Method Heat Seal, Coating,

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