Informes técnicos

  • Nuevo Analizador de Partículas CAMSIZER XT

    El control de calidad de polvos finos en el rango de tamaños entre 1 µm y 3 mm puede mejorarse sustancialmente con el nuevo CAMSIZER XT: un análisis más rápido y preciso de tamaño y forma de las partículas mejora la calidad del producto, reduce rechazos y ahorra costes.
  • Análisis granulométrico de piezas molturadoras

    La redondez como criterio de calidad
  • Quality control of recycled glass

    Particle shape analysis of glass beads
  • Improving quality control through effective particle characterisation of metal powders

    Advances in Powder Metallurgy production technologies are generating an increased demand for tailored and tightly controlled powders with distinctive properties. The control of particle size distribution, as well as particle shape, is an important step in the quality control process. In this article we compare the three most commonly used methods for powder characterisation and highlights the pros and cons of each process.
  • White Paper: Comparison of Methods

    Different measuring techniques provide different results – but what is the truth? The most common techniques to determine the particle size distribution are dynamic image analysis (DIA), static laser light scatter-ing (SLS, also called laser diffraction) and sieve analysis. This white paper presents the advantages and drawbacks of each technique, their comparability among each other as well as detailed application examples. Each method covers a characteristic size range within which measurement is possible and which partly overlap. The three methods discussed here, for example, all measure particles in a range from 1 μm to 5 mm. However, the results for measuring the same sample can vary considerably. This white paper will help to interpret the informative value and significance of particle analysis results and to decide which method is best suited for a particular application. The analyzers used for the measurements presented in this article are sieve shakers (Retsch), image analysis systems CAMSIZER® P4 and CAMSIZER® X2 (Retsch Technology) and laser granulometer Horiba LA-960.
  • Reliable quality control of sugar with digital image processing

    Quality control is an essential part of the sugar production process as manufacturers must ensure that the product complies with the customers’ specifications. Not only the look, texture and taste of the final product depends on the size distribution, but also the solubility, tendency to aggregate, agglomerate and other properties which are important for industrial processes using sugar as a raw material. Hence, care must be taken that particles are neither too small nor too big. Traditionally, the particle size determination is carried out by sieve analysis which is a rather slow, labour-intensive method and commonly subject to measurement errors such as: too much sample material, worn out (uncalibrated) sieves, wrong sieve parameters (amplitude and sieving time) or simple calculation errors. An excellent alternative for the quality control of sugar is Retsch Technology’s CAMSIZER®. CAMSIZER® measurements are fast, automated, accurate and 100% comparable with sieve analysis. With these advantages the instrument can reliably replace sieving.
  • Particle Shape Analysis

    Dynamic Digital image processing with the CAMSIZER
  • Quality Control of Catalysts with Digital Image Processing

    Catalysts are widely used as an important auxiliary material in the pharmaceutical and chemical industry. They are able to accelerate chemical reactions by lowering the activation energy, i.e. they change reaction kinetics. Thus, using catalysts in industrial processes has the advantage of higher productivity combined with less energy consumption. In many processes a mixture of liquid or gaseous raw materials (e.g. petroleum) is transformed in a reactor with solid catalyst material. Depending on the desired reaction, catalysts of different materials such as ceramics, alumina, metal or alloys are used. To save costs, inexpensive substrates can be coated with the actual catalyst (e.g. platinum or rhodium). The active surface as well as the form of the catalysts is crucial for their efficiency. It is important that sufficient free volume is available for the reactants. Moreover, the counter pressure built up by the catalyst must not be too high. Spherical, comb-shaped or rod-shaped geometries have proven to be especially suitable. The rod-shaped catalysts have different shapes; their profiles can have an ellipsoid, trilobe or quadrulobe shape.
  • Aromatic Beans

    With an estimated 1.4 billion cups of coffee consumed worldwide every day, there is a great and ever increasing demand for coffee beans in the global market. The taste of coffee is influenced by the roasting of the beans, their grinding degree and the method and quality of the preparation. Different types of preparation by brewing and filtering (e.g. espresso machine, filter coffee or mocca) require different grinding degrees of the coffee powder to obtain an aromatic result. When roasted beans are ground to powder, the determination of the particle size is a critical aspect because the particle size influences the brewing and filtering properties and thus the taste and salubriousness of the coffee.
  • Quality control in the fertilizer industry with Dynamic Image Analysis

    Particle size analysis is an important step in the quality control of many industrial
    production processes. This article describes the implementation of Dynamic Image Analysis (DIA) in the fertilizer industry as a typical example. DIA is used in the same way in other industries, for example for pharmaceuticals, foodstuff, plastics, chemicals, metal powders and even granulated explosives.
  • Particle Characterization with Dynamic Image Analysis

    Sieve analysis and laser diffraction are long established methods for the determination of particle size distributions. Dynamic Image Analysis (DIA) is another particle analysis technology to measure particles > 1 micron which has numerous advantages over these methods.

    Retsch Technology’s particle analyzers CAMSIZER and CAMSIZER XT, which are based on DIA technology, evaluate images of the particles which provide considerably more information on the particles than, for example, a light scattering pattern produced by a laser diffraction particle analyzer. These only allow for an indirect measurement of the particle size. The determination of parameters such as the length, width, or sphericity of particles is only possible by using image analysis.
  • Seeing is believing: Particle size and shape measurement with Dynamic Image Analysis

    Traditionally, particle size distribution analysis of pharmaceutical powders and granules is carried out by sieve analysis, microscopy or with laser diffraction. These methods are established in the pharmacopoeia and used routinely in pharmaceutical laboratories all over the world.
    With the introduction of Dynamic Image Analysis (DIA) as an alternative method, it is now possible to measure particle sizes >1 micron of powders, granules, pellets and suspensions as well as particle shape. A number of trials clearly demonstrate the advantages of DIA compared to the established particle sizing methods.
  • CAMSIZER XT - Quality Control of building materials

    The CAMSIZER XT has been successfully installed at building material plants around the world replacing sieve analysis by providing quick, reliable high resolution results while still matching historic sieve data. The typical measurement time varies between 1 to 3 min depending on the desired measuring statistics. Reported result parameters include smallest diameter, length, mean diameter, aspect ratio, symmetry, sphericity, and convexity.
  • Different production sites, identical production quality

    Quality control of solder powders with the CAMSIZER XT - solder pastes are used in the electronics industry for reflow-soldering of SMD (surface mounted devices) components on printed circuit board (PCB) assemblies. The solder paste is printed on the contact pads and the components are mounted on these pads. The paste attaches the components on the PCB until the PCB is heated in an oven where the solder paste melts. The melt connects the electronic components (resistors, transistors, ICs, EPROMS, etc.) and the contact pads of the PCB providing the electric contact and mechanical fixture after cooling and solidification. An essential component of solder paste, beside the flux, is the solder powder.
  • Efficient and precise: Particle size and shape measurement of sugar with Dynamic Image Analysis

    Sieve analysis according to ICUMSA Method GS2/9-37 is the standard for particle sizing of crystal sugar. Officially, all labs follow these guidelines, and comparable results should be seen in round robin tests. On a closer look however, each lab
    follows procedures that deviate slightly from those outlined in the ICUMSA Method. As a result, the size distributions measured by different labs vary remarkably. In this article we will discuss the typical deviations that can be found in the daily operation, and propose a new analysis method which provides
    more reproducible and reliable results.
  • Particle Size Distributions: Dynamic Image Analysis Beats Laser Diffraction

    Laser diffraction is the most frequently used measurement technique for the analysis of particle size distributions in the range 1 micron to 1 mm in the context of quality control. Modern laser diffraction systems offer some convincing advantages such as short measurement times, easy operation and reproducible analysis results. However, they also have various disadvantages: Even if the instruments have been calibrated and validated, an absolute particle size measurement is not possible. Various round robin tests have shown that the analysis results depend strongly on the type of instrument and even on the particular model and software version.