Innovative and environmentally safe composites based on starch modified with dialdehyde starch, caffeine, or ascorbic acid for applications in the food packaging industry

Spot colors are widely used in the food packaging industry. We wish to add a watermark signal within a spot color that is readable by a Point Of Sale (POS) barcode scanner which typically has red illumination. Some spot colors such as blue, black and green reflect very little red light and are difficult to modulate with a watermark at low visibility to a human observer. The visibility measurements that have been made with the Digimarc watermark enables the selection of a complementary color to the base color which can be detected by a POS barcode scanner but is imperceptible at normal viewing distance.

Download Full-text

Paperboard Coating Detection Based on Full-Stokes Imaging Polarimetry

Sensors ◽

10.3390/s21010208 ◽

2020 ◽

Vol 21 (1) ◽

pp. 208

Author(s):

Javier Brugés Martelo ◽

Jan Lundgren ◽

Mattias Andersson

Keyword(s):

Food Packaging ◽

Imaging Systems ◽

Gaussian Kernel ◽

Support Vector ◽

Camera System ◽

Distance Correlation ◽

Imaging Polarimetry ◽

Packaging Industry ◽

Thickness Variations

The manufacturing of high-quality extruded low-density polyethylene (PE) paperboard intended for the food packaging industry relies on manual, intrusive, and destructive off-line inspection by the process operators to assess the overall quality and functionality of the product. Defects such as cracks, pinholes, and local thickness variations in the coating can occur at any location in the reel, affecting the sealable property of the product. To detect these defects locally, imaging systems must discriminate between the substrate and the coating. We propose an active full-Stokes imaging polarimetry for the classification of the PE-coated paperboard and its substrate (before applying the PE coating) from industrially manufactured samples. The optical system is based on vertically polarized illumination and a novel full-Stokes imaging polarimetry camera system. From the various parameters obtained by polarimetry measurements, we propose implementing feature selection based on the distance correlation statistical method and, subsequently, the implementation of a support vector machine algorithm that uses a nonlinear Gaussian kernel function. Our implementation achieves 99.74% classification accuracy. An imaging polarimetry system with high spatial resolution and pixel-wise metrological characteristics to provide polarization information, capable of material classification, can be used for in-process control of manufacturing coated paperboard.

Download Full-text

Evaluation of the effects of additives on the properties of starch-based bioplastic film

SN Applied Sciences ◽

10.1007/s42452-021-04433-7 ◽

2021 ◽

Vol 3 (4) ◽

Author(s):

Olugbenga O. Oluwasina ◽

Bolaji P. Akinyele ◽

Sunday J. Olusegun ◽

Olayinka O. Oluwasina ◽

Nelcy D. S. Mohallem

Keyword(s):

Tensile Strength ◽

Food Packaging ◽

Surface Topology ◽

Root Mean Square Roughness ◽

Starch Solution ◽

Dialdehyde Starch ◽

Force Microscopy ◽

Silica Solution ◽

The One ◽

Bioplastic Film

AbstractThe adverse environmental effects of petroleum-based packaging plastics have necessitated the need for eco-friendly bioplastics. Most bioplastics are starch-based and are not without drawbacks, hence there is the need for their properties to be improved. In this study, the effect of varying concentrations of dialdehyde starch and silica solutions on the physical, mechanical, biodegradable, surface topology, and thermal properties of the bioplastic films was examined. The additive concentrations were varied from 60 to 100%. The bioplastic films produced with dialdehyde starch solution recorded better moisture content (6.62–11.85%), bioplastic film solubility (4.23–7.90%), and tensile strength (1.63–3.06 MPa), against (11.24–14.26%), (7.77–19.27%) and (0.53–0.73 MPa) respectively for bioplastic films produced with silica solution. The atomic force microscopy analysis; root-mean-square roughness, kurtosis, and skewness revealed better miscibility and compatibility between the starch matrix and the dialdehyde solution than between the starch matrix and the silica solution. Bioplastic with added dialdehyde starch solution has better tensile strength and long biodegradability than that with silica solution. The research has demonstrated that bioplastic film produced with starch and dialdehyde starch solution has better properties than the one produced with starch and silica solution. The properties evaluation results of the bioplastic films thus demonstrated their aptness for food packaging applications. Graphic abstract

Download Full-text