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Fastrip Spray Technology to treat automotive components

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Read the article published by ipcm (May2019) featuring our Fastrip S spray technology for the chemical paint stripping of automotive components.

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Fastrip Spray Technology to treat automotive components

  1. 1. 114 N. 57 - MAY/JUNE 2019 - international PAINT&COATING magazine FOCUS ON TECHNOLOGY SPECIAL ON AUTOMOTIVE & TRANSPORTATION Monica Fumagalli ipcm® ©ipcm® PSP, One o the Italian Pioneers o Contracting Paint Stripping, Counts on the New FASTRIP Spray Technology to Treat Automotive Components Opening photo: Car components such as windscreen wipers and roof rails are among the most complex products to paint strip. I n the field of surface treatments, the automotive industry is certainly among the sectors demanding the highest coating performance and compliance with the most stringent requirements. One of the most overlooked aspects in this framework is the paint stripping of car components that need to be recovered and reworked. The number of these parts is higher than one might think and the complexity of this operation is determined by the different materials used (aluminium, zamak, galvanised sheet metal, steel, etc.) and the number of recovery attempts made on defective parts, which are uneconomical to eliminate from the coaters’ production process (ref. Opening photo). PSP Sverniciature Sas (Bornasco, Pavia, Italy) specialises in the maintenance of frames, hooks, and piece- hanging accessories intended for coating lines and in the recovery of coated parts that present any defects. During its history, it has implemented all development stages of the various stripping technologies. “PSP was among the first companies to start a paint stripping contracting business at the end of the 1980s,” says Massimiliano Prederi, the owner of this firm together with his wife Elena. “The development of this field contributed to regulate both the paint stripping of coating hooks and the recovery of defective parts, which used to be performed with operations that did not respect health and the environment. “PSP started by using the cryogenic technology to paint strip frames and hooks. Then, we implemented the thermal technology with a pyrolytic oven for the
  2. 2. FOCUS ON TECHNOLOGY 11 12 ©ipcm® ©ipcm® 115international PAINT&COATING magazine - MAY/JUNE 2019 - N. 57 recovery of iron workpieces. With the last system installed in our factory and supplied by Alit Technologies (San Bonifacio, Verona, Italy), we can now treat any type of material (Fig. 1).” The machine developed by Alit, a firm specialising in chemical paint stripping solutions for metals, is based on the spray application technology, an innovation for the paint stripping sector presented on the pages of this magazine on the occasion of the launch of the FASTRIP range1 . PSP is the first company in Italy to use it for large-scale products. The state of the art of paint stripping PSP’s growth followed the evolution of paint stripping technologies, with all their pros and cons. “Cryogenic paint stripping is a low environmental impact technique,” explains Prederi. “It is very effective for removing thick layers of paint deposited on coating hooks, but it is less suitable for removing 1 I. Paolomelo, Innovative Paint Stripping Systems: Alit’s New Products Presented at PaintExpo 2018, in ipcm® International Paint&Coating Magazine no. 51 (May-June 2018), pages 104-105. coatings from defective products. In the pyrolytic oven, the workpieces are introduced into the chamber for pyrolysis (flameless combustion) at a maximum temperature of 450 °C, so as not to permanently deform the metal elements treated.” Chemical stripping is a process that has existed for many years, although harmful paint strippers to the environment were used in the past. The research and development of new products has led many companies in the sector to develop acid or alkaline- based paint strippers with increasingly better performance in terms of safety and environmental impact. That is why, in order to differentiate its process range and offer a complete service to its customers, PSP has recently implemented a new chemical paint stripping technology developed by Alit. Figure 1: The FASTR P paint stripping plant installed by Alit Technologies at the premises of PSP Sverniciature Sas. PSP Sverniciature Sas specialises in the maintenance o rames, hooks, and piece- hanging accessories intended or coating lines and in the recovery o coated parts that present any de ects. During its history, it has implemented all development stages o the various stripping technologies.PSP was among the rst companies to start a paint stripping contracting business at the end o the 1980s.” “We chose to add this new treatment to the ones already performed,” states Prederi, “with the aim of offering, in addition to the paint stripping of coating frames and accessories, a process suitable for all the materials that are difficult to handle with the cryogenic and thermal technologies, such as Figure 2: The entrance to one the two chambers of the spray paint stripping plant.
  3. 3. 116 N. 57 - MAY/JUNE 2019 - international PAINT&COATING magazine SPECIAL ON AUTOMOTIVE & TRANSPORTATION 13 14 ©ipcm® ©ipcm® for example the aluminium workpieces constituting automotive components and design products like handles and lamps.” Indeed, chemical paint stripping is particularly suitable for treating metal alloys that reach their melting point at 300 °C, such as aluminium. PSP’s paint stripping processes: di erent operations for a complete service Each paint stripping plant installed by this Italian company performs a different operation: in the cryogenic system, FASTRIP’s requirements “The FASTRIP paint stripping plant installed in the factory of PSP is a modular system with one tank,” says Alit Technologies owner Loris Rossi (Fig. 2). “The parts are loaded into a basket that subsequently enters the first tank, where they are treated at a temperature of 120 °C (Fig. 3). During the spraying of the paint stripping product, the basket rotates by 360° for the whole cycle, which ends with a suction phase. After checking that all workpieces have been properly stripped, the basket is removed from the stripping tank and is placed in a second, identical tank containing water at 70 °C to rinse the components. In this way, after verifying that they have been stripped in compliance with specifications, the parts can be immediately packaged and preparedFigure 3: The inside of the chamber, with its basket rotation system. Figure 4: The vertical arrangement of bars facilitates the paint stripping operations. The machine developed by Alit, a rm specialising in chemical paint stripping solutions or metals, is based on the spray application technology, an innovation or the paint stripping sector presented on the pages o this magazine on the occasion o the launch o the FASTRIP range.PSP is the rst company in Italy to use it or large-scale products.” galvanised frames are recovered before being sandblasted in a two-chamber shot blasting machine supplied by OMSG (Villa Cortese, Milan, Italy) and specifically tailored to PSP’s needs. The oven installed by Ciroldi (Villa Ganaceto, Modena, Italy) paint strips frames and recovers iron parts. Alit Technologies’ FASTRIP paint stripping plant, finally, is used to recover products in any type of metal, especially aluminium and similar alloys, with defective coatings.
  4. 4. FOCUS ON TECHNOLOGY For the painting of aluminum wheels, Dürr delivers powerful technologies along the whole process, starting with wheel surface cleaning and chemical conversion for effective corrosion protection, painting and curing, to the purification of air exhaust. Dürr offers their own application technology with specially patented features that fit best with the requirements of quality-oriented aluminum wheel surface painting. www.durr.com Aluminium Wheel Painting Excellence in surface finishing for delivery.” The system’s modular structure allows replacing only the saturated bath while using the second tank for cleaning and rinsing, so that it is not necessary to completely replace the stripping solution. However, Alit did not only design and supply a mere paint stripping plant. “Besides meeting the customer’s paint stripping requirements,” adds Rossi, “our staff identified other critical issues related to this process. That is why we tried to provide PSP with a complete system integrated with all useful devices to make its operation cost effective and eco-friendly. In addition to the new stripping technology, our engineers designed and installed a diathermic oil heater, a scrubber for fume abatement, and a sludge treatment unit.” The machining residues, composed of the paint stripper and the waste produced by the coating removal process, are gathered in a decanter to be dehydrated and then filtered with a filter-press specifically developed to recover the paint stripper, which is separated from sludge and recirculated into the machine with some fresh product. The solid residue is disposed of as special waste. The advantages of the new spray technology “Thanks to the technology installed,” says Prederi, “for our chemical paint stripping process we can use products with a low environmental impact, which are activated at 120 °C (i.e. almost the double of the temperature required by immersion processes, occurring at 50 or 60 °C) but PSP chose to add this new treatment to the ones already per ormed with the aim o o ering, in addition to the paint stripping o coating rames and accessories, a process suitable or all the materials that are di cult to handle with the cryogenic and thermal technologies, such as or example the aluminium workpieces constituting automotive components and design products like handles and lamps.”
  5. 5. 118 N. 57 - MAY/JUNE 2019 - international PAINT&COATING magazine SPECIAL ON AUTOMOTIVE & TRANSPORTATION 15 16 ©ipcm® ©ipcm® have very high flash points and are not toxic. As a further benefit, they also allow performing a “soft stripping” operation, i.e. a delicate stripping process that does not change the molecular structure of the workpiece or the chemistry of metal, which can thus maintain its peculiar resistance characteristics.” “The system,” Rossi explains, “can perform a quicker paint stripping cycle compared with conventional chemical stripping processes requiring an immersion in the tank, because it combines the benefits of mechanical action with the effects of high temperatures: a cycle lasts about 20 minutes per removed paint layer, on average. Moreover, the components are arranged vertically and in fixed positions within the basket (Fig. 4). This has two advantages. First of all, by avoiding bulk processing, there is no need for spacers, which could Figure 5: From left to right: PSP Sverniciature Sas owner Massimiliano Prederi, Elena Leonelli, and Loris Rossi, the owner of Alit Technologies (San Bonifacio, Verona). jeopardise the stripping process due to their contact with the workpieces’ surfaces. Secondly, thanks to the vertical arrangement of the bars, these do not lean against each other as they would do with a horizontal arrangement, thus favouring the removal of paint. In order to facilitate the parts’ exit from the stripping chamber, we have equipped our plant with side platforms where they can be easily gathered. We have created a special rack for long workpieces (max. 2000x1400 mm) that can host 136 bars. Alit Technologies’ team is currently developing a project to increase this spray paint stripping plant’s maximum capacity up to a workpiece size of 2500x1400 mm.” Simpli ed stripping of automotive components In the field of automotive components, the recovery of several workpieces poses an issue. In particular, PSP treats numerous batches of windscreen wipers and roof rails. “The spray stripping results on these products are optimal,” states Prederi (Fig. 5). “The chemical product used only removes the upper surface layer without damaging or altering the galvanised one (Fig. 6). Thanks to our FASTRIP system, the diversity of materials and the recovery attempts performed by the applicator are no longer an issue: the defective coating removal speed and the ability to perform a multi-metal treatment have solved these problems and even streamlined our process, revolutionising the way in which we have always conceived paint stripping.” Thanks to FASTRIP system, the diversity o materials and the recovery attempts per ormed by the applicator are no longer an issue:the de ective coating removal speed and the ability to per orm a multi-metal treatment have solved these problems and even streamlined the process, revolutionising the way in which paint stripping has always been conceived.” Figure 6: The spray stripping results on the products treated by PSP.

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