Characterization of soy protein–celery composite paper sheet: Rheological behavior, mechanical, and heat‐sealing properties

The rheological properties of soy protein spray‐coating dispersions were investigated as a function of concentration (10–13.75%) and temperature (30–60°C). The dispersions showed a shear‐thinning behavior. With the increase in concentration, the consistency coefficient (κH) values increased. An increasing in temperature led to an increasing flow behavior index (nH) and a decreasing κH. However, Cox–Merz rule was not applicable to the coating dispersions. Soy protein–celery composite paper sheet was prepared by spraying soy protein on the surface of the celery paper sheet. The cohesion of soy protein and celery fiber resulted in sealing of celery paper. The seal strength increased with the increase in soy protein concentration. The seal strength increased from 114.850 to 160.560 N/m, when the soy protein concentration increased from 10 to 13.75%.