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Paint & Enamel Forum

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Visit to German wet paint plant using robots. Line entry and exit are side by side, minimising supervision personnel. Newly developed plant for continuous vitreous enamelling of tubing for heat exchangers. Table lists pro's & con's of such a coating as against other candidate materials and/or coatings. Selective coating & test & quality assurance means are noted. Paint & powder stripping (e.g of hooks, racks etc) - best done in-house or sent out ? Key questions are outlined. Thermal stripping incl. of aluminium, is focus.

Paint & ink remover two-phase system.

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A two-phase paint and ink stripper composition comprises an aqueous phase containing a basic activator in the form of an amino-alkyl-alkanol and an organic phase which contains an alkylene carbonate and organic solvents. The paint stripper composition is free from methylene chloride and does not contain monoethanol amine. Histogram shows stripping rates for various cmpds.

Paint & organic coating notes

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Short notes incl. new Nordson powder coat system in 4 variants; low loss hand-painting and colour changeover technique with automated colour change over & pneumatic hand spray gun with partly automatic spray setting, from IPA Fraunhofer Inst. Overview of R & D (research & development) in paint industry, with statistics on numbers employed, some historical facts & comments on testing procedures, new concepts in coatings, solvent reduction, advances in technology and future ideas for recycling of paint. (Source; Deutsches Lackinstitut). New ideas for using powder residues. Flow chart shows a sorting & classification followed by addition of binders etc to create new materials for internal or external use.

Paint & organic coating stripper

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Incl. salting out agent, carboxylic acid, organic solvent.

Paint & organic coating stripper

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Dialkyl carbonate, hydrogen peroxide & water sol'n.

Paint & organic coating stripper

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Min 10 wt% alkylene carbonates, 10-90% dibasic ester, up to 20% hydrogen peroxide, up to 30% water

Paint & powder

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Visit to powder coating plant, showing equipment, computer control etc, and another plant where sheet metal is powder coated. Photos show examples of troublesome shapes, where designer did not sufficiently take into account the coating process. A jobbing coater who has minimum floorspace (14 x 12 m). Layout of plant is shown. Pigmented acrylic powders as alternative to wet paint for applications where weathering conditions are severe or appearance and aesthetics are at a premium. Graphs etc show Florida sunlight and exposure to hot cooking oil.

Paint & powder

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Visit to powder coating plant, showing equipment, computer control etc, and another plant where sheet metal is powder coated. Photos show examples of troublesome shapes, where designer did not sufficiently take into account the coating process. A jobbing coater who has minimum floorspace (14 x 12 m). Layout of plant is shown. Pigmented acrylic powders as alternative to wet paint for applications where weathering conditions are severe or appearance and aesthetics are at a premium. Graphs etc show Florida sunlight and exposure to hot cooking oil.

Paint & powder

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Notes on Patchwork painting which can be integrated with computer simulated spray patterns and planning software. Application of these ideas to automotive bodywork is detailed with hisato showing costs of various options. Note on simulation of the entire painting cycle incl. materials flow and drying line. Ultra-thin powder coatings are 20-30µm thich and have surface character close to that of wet paint. Special feature is absence of buld-up at edges, though these are fully coated. New powder coating unit with very dense flow offers ease of operation & cleaning. Powder coating for extreme conditions (architectural cladding) with rapid colour changeover.

Paint & powder

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2 short visits. Aluminium water and drinks bottles are interior coated, here a case study of wet-paint conversion to powder. www.sprimag.de. High-end bicycles with carbon fibre frames & wheel rims are coated then transfers tused to apply logos etc. www.storck-bicycle.de

Paint & powder features

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Features on new shop at Krauss Mafei where 32 tonne components & injection moulding machines are spray painted on a time scheduled basis. Visit to BMW shop where their cars are repaired and repainted to highest quality. Feature on duplex coatings on steelwork (hot dip galvanised + paint) the latter now being replaced by powder coating. Disc'n of outgassing which can render powder coating porous. White zinc corrosion products are then transferred to exterior of film where they show as defects. In place of the zinc coating, an inner basecoat powder coating can be used, the so-called "dual" system..

Paint & powder on the march

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Collection of items, incl. a joint Volvo + DuPont high gloss pearlitic finish using a tri-coat water based system. The TriCoat wet-on-wet process is discussed in an interview. Advances in powder coating are surveyed, new applications, new powders and the minimal VOC emissions from powders being a further driver, Statistics for powder use in 5 major European countries and in 5 continents (year 2000). Europe is easily the largest user. Powder coating is now available for thin films. Sketches show near-infra-red cured process compared with conventional IR cure. Graph shows development in powder particle size distribution. Coments on coil-coating, electromagmagnetic brush coating, and table listing high-temperature powders (to 538°C). 17 refs. Acrylate powders push ahead, a summary of these new powders which solve many problems of the past. Table lists market statistics for power type by continent and graph compares weathering (gloss values) over 3000 hrs for 4 powder types.

Paint & powder & architectural features

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Visit to Ukrainian car manufacturer Bogdan and their paint shop, provided by leading German mfr. Survey of powder-coated aluminium architectural cladding in Berlin and how it has withstood 25 years of urban air exposure. 4 refs. Hot-dip galvanising of architectural cladding, fencing etc, incl. photos of some very modern sculptural fencing, plasma cut, the hot-dip galvanised. Corrosion protection of the Eiffel Tower with brief history, application of 2-coat paint is described. www.bayferrox.de.

Paint & powder coat features

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Using a load cell, the weight of precoat filter-aid material can be monitored and this also allows an estimate of aerosol build-up in the filters, so that the correct time for topping-up with fresh pre-coat can be gauged. Savings of up to 30% have been found. Possible recycling of chalky material is discussed. www.kl-direkt.de. Solvent-free paint based on polyurea as a high-performance corrosion protection, with several advantages over polyurethane. Has good heat- and moisture-resistance and can be used for painting commercial heavy-duty trucks..www.vip-gmbh.com. New powder-coating booth allows both manual and automated coating. www.jumbo-coat.de

Paint & powder coat lines and plant: Features

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Interview with BMW chief discusses filler-free painting of autobodies in practice and IPP (Integrated Paint Process) at Mini plant in Oxford. (pp. 16-19). Advances in robotic paint spraying of car bodies. Simplification brings benefits (pp.20-22). Optimising efficiency of a paint line, minor canges and fine-tuning brings benefits (pp. 24-26). New production line where plastic injection moulding, painting and PVD coating are part of a continuous production line, e.g for cellphone casings (pp. 28-32). Corrosion protection of brake discs (disks) with infra-red curing of powder coat. (pp. 34-36). On-line painting of automotive bolt-on parts (doors, hood or bonnet panels etc). Colour matching, thickness meas't are all on-line. New thermoplastic Ultramid TOP 3000 is used. (pp. 38-42). Use of and painting of biomaterials for automotive car bodies, e.g hemp or other natural fibres. (pp 44-45)