Automated plastic recycling
Plastic recycling is the most effective way to minimize the impact of pollution as it reduces oil usage, industrial waste water and greenhouse gas emissions. Plastic recycling relies on previous sorting steps, as different polymers cannot usually be blended into homogenous mixtures. Modern, large-scale sorting plants use NIR spectroscopy for different types of clear and colored polymers such as PET, HDPE/LDPE, PP or PS. ZEISS PGS NIR series (960 - 2200 nm) provides fast, real-time identification of polymers with diffuse reflection measurements. PGS spectrometers have a compact footprint, highest SNR and fast readout.
Plane gratings in the VIS and NIR spectral range complete the product lineup for the single channel detection of polymers. Numerous standard plane gratings are available and suited to your specific requirements. Conveyor belt sorting processes are well suited to hyperspectral imaging spectrometers, combining spatial and spectral information in a single frame mode. ZEISS Offner gratings using holography and aberration correction are widely used for VIS and NIR spectral ranges.
Pulp & paper
Pulp & paper processing
VIS-NIR spectroscopy is used within the paper & pulp industry at many critical production steps for chemical composition analysis. This ranges from quality control of raw materials as wood chips, process control of pulping, paper web formation and pressing/drying steps to recycling of scrap paper. ZEISS MMS 1 (310 - 1100 nm) and PGS series (960 - 2200 nm) are ideal choices for in-line VIS-NIR spectroscopy, to determine lignin, cellulose, fiber fillers and moisture content.
Hyperspectral imaging is common in paper processing on conveyor belts. The combination of spectral and spatial information in one spectrometer with single image capture provides more efficiency. ZEISS offers customer-specific Offner gratings for the VIS / NIR spectral range using holographic manufacturing techniques with aberration correction at the grating element.