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Plastique

Correction en cours de fabrication

 Peu importe qu'il faille déterminer avec précision l'épaisseur de paroi de préformes ou de bouteilles en PET, l'épaisseur de films pendant la production ainsi que celle des emballages – vous faites toujours le bon choix avec les capteurs CHRocodile. Les variations dans le processus de production peuvent être détectées grâce à la mesure sans contact et rapide. La vitesse de mesure élevée permet d'intervenir sur la commande pendant la production. Nos capteurs ont fait leurs preuves chez des fabricants réputés pour la mesure de la topographie de pièces moulées par injection et la mesure de l'épaisseur de paroi des blisters (PET, PP, EVOH).

Applications
CHRocodile K
Mesure d'épaisseur de films

Welded seams in plastics must often undergo non-destructive tests. This may be the case in medical applications, such as multi-chamber pouches. Also the connection between the pouch and hoses and connectors can also be joined with welded seams. Quality and reproducibility can also be tested by the thickness of the welded seam.

CHRocodile LR
Measuring air gaps and film thicknesses in production processes of technical polymers and PET

Technical polymers, such as Cyclo-Olefin-Copolymers (COC), are amorphous and therefore transparent, unlike partially crystalline polyolefins. As a result, they are particularly suitable for unilateral, contact-free thickness measurements by optical sensors. Low twin refraction properties are important for optical applications. Outstanding biocompatibility and extremely low water absorption/ water vapour permeability must be emphasised in the field of medicine and diagnostics. COC products are optical window films for flat screens as well as syringes, microtitre plates, cuvettes and flasks. In production, Precitec sensors measure the thickness of air gaps and layer thicknesses.

CHRocodile sensors are also used in coating processes by polymethyl methacrylate (PMMA, acrylic glass or Plexiglas). They can also be used in inline processes (roll to roll) to measure layer thicknesses (in the low micron range) on Polyethylenterephthalat (PET), unlike sensors with a low sampling frequency. 

CHRocodile S / SE
Measuring the thickness of plastics or plastic coatings

Polycarbonates are coated to increase scratch resistance or UV resistance, for example. The coating and the material thickness can be measured by optical sensors without the sensors coming into contact with the items. Polycarbonate, a transparent plastic, is often used as an alternative to glass. Compared with brittle glass, polycarbonate is lighter and considerably more shock-resistant. Its negative properties, such as scratch-resistance or UV resistance can be reduced by coatings. For example, polyurethane acrylate layers of a few microns can be measured with the CHRocodile SE sensor.

The same also applies to EPDM. This is ethylene proplylene diene monomer rubber (cellular rubber). It is used for various seals, such as O rings for slide ring seals and for hoses, for steam or hot water, because it is highly flexible and has good chemical resistance. A confocal sensor can detect undesirable corrugation in the material. 

CHRocodile LR
Micro lens arrays

Chromatic confocal sensors can measure the shape of micro lenses and thus help to detect surface defects. Optimised shapes are important for a distortion-free image and optimum light output. Lens arrays of cylindrical, aspherical or spherical lenses are made of highly refractive and highly transparent glass. Contact-free measuring systems using chromatic confocal sensors prevent damage to the lenses from tactile measuring sensors and enable a three dimensional surface image of the lens system. The curvature radius of the lenses can be determined. The sensors create highly significant 3D data. 

CHRocodile IT TW
Measuring layer thicknesses of food packaging films

Multiple layers can be measured by the CHRocodile IT-TW using interferometric thickness measurements with infrared light. This is the case, for example, with multi-layer food packaging films where the adhesive layer thickness is important. Places without adhesive can be detected in this way. In this way the thickness of films that are not transparent to white light can be measured. Even the individual layer thicknesses of multi-layer films can be measured if the refractive index of the materials is different.

CHRocodile K
Inline wall thickness measurement of artificial casings

The product to be measured is an artificial casing made of collagen. This is used as a natural skin for sausages. The material has a rough surface. This is made from a by-product of leather production and is known as a hide fibre sleeve. Here the ability of the measuring system to transfer continuous measurements to the measuring head quickly and therefore to measure strongly vibrating films is impressive. Without this measuring option the measurements must be taken using a much more inaccurate tactile process by determining the weight. This is much slower. The CHRocodile K sensor supplies high quality thickness values with this semi-transparent film that appears uneven and full of fissures according to the measurement results. 

CHRocodile K
Measuring the wall thickness of plastic moulded parts

Plastic moulded parts, such as cuvettes or pipettes, can be measured without contact with an interferometric measuring system. Wall thicknesses can be determined in this case directly with the optical probe and a spacer on their own if no measuring machine is available.

CHRocodile S / SE
Mesure de la topographie sur des pièces moulées par injection

Les pièces moulées par injection peuvent être diverses et variées - qu'il s'agisse de la forme, la couleur ou la qualité de la surface. Un système de mesure topographique doit être adapté à ces conditions cadres pour fournir des valeurs utiles. Le capteur CHRocodile SE combiné aux têtes de mesure optiques à grande ouverture remplit ces conditions à la perfection. Il peut être utilisé sur toutes les surfaces, convient à pratiquement toutes les géométries de pièces et n'est pas sensible aux influences de l'environnement. La précision de mesure et la résolution latérale se trouvent dans la plage des µm, la résolution axiale dans la plage submicronique. De plus, le CHRocodile SE offre des fréquences de mesure impressionnantes de plusieurs kHz ! Mais à quoi servent ces valeurs convaincantes si l'intégration facile dans l'environnement de processus est impossible ? Cette dernière n'est ici pas un problème, car la synchronisation avec le matériel externe est assurée par une multitude d'interfaces conformes au standard industriel actuel.

CHRocodile K
Mesure d'épaisseur de films

Les films fins trasparents et non-transparents sont généralement produits à haute vitesse, dans des conditions d'envirennement exigeantes. Pour cette raison, un capteur très robuste doit être utilisé pour contrôler  l'épaisseur du film au cours de la production. La technique de mesure ne doit pas être affectée par les paramètres environnementaux  comme la température, l'humidité, ou les vibrations du film. Le CHRocodile K, grâce à sa méthode de mesure interférométrique, remplit parfaitement ces conditions, tout en combinant très haute précision et vitesse. Il permet de contrôler les paramètres du process de production de films plastiques avec une réactivité maximale.

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