Yearbook 2013/2014 - ehedg

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EHEDG Subgroups 167 Given a clean surface and sufficient oxygen from the air or from water, stainless steels will naturally and rapidly establish a tenacious passive layer on all exposed surfaces. If the passive layer is physically damaged during or after the fabrication of the equipment, it must be afforded the opportunity to repair itself, which it will do rapidly as soon as the surface is clean and exposed to oxygen again. Nevertheless, for particularly demanding applications, the strength of the passive layer can be improved by a treatment known as chemical passivation. For highly-critical applications, the hygienic quality of the surface can be even further enhanced by electro-polishing. However, the need for the enhancement of the passive layer should be regarded as the exception rather than the rule. The heat of welding can destroy the passive layer local to the weld and leave a distinctive, coloured ‘heat-tint’ which will exhibit reduced resistance to corrosion. In this case welding must be followed by a pickling procedure specifically designed to remove heat-tint and allow the passive layer to reform naturally. Pickling, chemical passivation and electro-polishing should be seen as separate treatments and not as alternatives. Each treatment should only be carried out with care. It also must be remembered that the chemical used for those treatments in an integrated system may adversely affect elastomeric, plastic and glass materials. It is therefore important to apply to assembled equipment only surface treatments which are appropriate to all the materials with which they might come into contact. Because of the described different influences to ensure and improve the hygienic performance of the product contact surface, the group decided to integrate pickling, and electro-polishing in addition to passivation into the new draft “Chemical Treatment of Stainless Steel”. It was finished during the last meeting in August 2012 and has been submitted to the EHEDG Guideline approval procedure. Chairman: Dr. Gerhard Hauser Goethestr 43 85386 Eching E-mail: gerhardwrhauser@yahoo.de Fax (+49 81 61) 71 42 42 EHEDG Subgroup “Cleaning Validation” Dr. Rudolf Schmitt, rudolf.schmitt@hevs.ch In June 2011 the Subgroup “Cleaning Validation” became active. More than 30 participating experts in this group are ample proof for the strong interest in this particular subject. The purpose of this Subgroup is to prepare a new EHEDG guideline on the basics and principles of “Cleaning Validation” in the food sector. An inadequate cleaning process may result in residue being carried forward. This residue may then contaminate the next batch to be manufactured in the same equipment. The most significant contaminants in the food sector are product from the previous batch, microorganisms, allergens, cleaning agents and lubricants. Cleaning validation is necessary to prove the consistency and effectiveness of established procedures that have been found acceptable. This document shall describe how design principles and the qualification of equipment are employed in a validation scheme that gives documentary evidence of the effectiveness of the cleaning procedure. The guideline shall cover validation in the food sector in a general way and can be applied for different purposes. However, the development of further specific guidelines for particular applications i.e. the validation of CIP, the validation of manual cleaning, the validation of dry cleaning, and the validation of disinfection, is strongly recommended. Chairman: Dr. Rudolf Schmitt HES-SO Valais Institute of Life Technologies Rue du Rawyl 64 1950 Sion Switzerland Phone +41 27 6068611 Fax +41 27 606 86 15 E-mail rudolf.schmitt@hevs.ch
168 EHEDG Subgroups EHEDG Subgroup “Conveyor Systems” Jon J. Kold, e-mail: jk_innovation@yahoo.com In January 2011 the EHEDG Subgroup “Conveyor Systems” became active. The group has collected a huge amount of material and is in the process of editing the content. The purpose of the Subgroup is to prepare a new EHEDG Guideline on the hygienic design of conveyor systems to be used in food manufacturing or processing. The Subgroup consists of approximately 15 professionals from companies and institutions. This underlines the industry’s broad interest in the subject. Conveyor systems are widely used in food manufacturing for moving raw materials, processed food and packaged products. The upcoming guideline is primarily aimed at conveyors used in high risk areas, i.e. the processing of non-packaged foods in direct contact with the conveyor or transported in open boxes. There are several reasons to reduce the hygiene risk by applying hygienic design to conveyor systems. The guideline may be used as a communication tool between purchasing companies and suppliers making sure that new conveyors comply with hygienic requirements specification. The Subgroup “Conveyor Systems” is chaired by EHEDG Denmark who have previously elaborated a guideline for hygienic deign of conveyers for the food industry. Hygienic design of conveyor systems The hygienic design of conveyor systems is complex and demanding. Many solutions with regard to function, design, cleanability and service of the equipment must be considered thoroughly. The equipment should be as open as possible for easy accessibility and cleaning. The number of guards should be minimised to what is necessary for reasons of safety and should not prevent efficient cleaning. Guards should be removable during cleaning/disinfection, either through opening or by unhinging. Topics which are being dealt with during the working period: • Different types of belts • Lateral guides for belts • Lateral guides for product • Drive stations • Drum motors • Gear motors • CIP cleaning systems Time schedule The new guideline is intended to be finalized within the next 12 – 18 months. If you are interested in joining this Subgroup please contact the chairman, Mr. Jon J. Kold, jon.kold@staalcentrum.dk, or the EHEDG Secretariat jana.huth@<strong>ehedg</strong>.org. Chairman Jon Kold Fredensvang 38 7600 STRUER DENMARK Phone:(+45 40) 57 13 46 E-mail: jk_innovation@yahoo.com EHEDG Subgroup “Dry Materials Handling” Karel Mager, e-mail: karel.mager@givaudan.com When the EHEDG started in 1989 most of the available knowledge on hygienic design was about liquid handling and liquid processing equipment. In the following years a couple of documents about test methods and design principles concerning this topic were published. In the area of dry particulate materials (powders) there was a need for similar documents: design principles and guidance for hygienic engineering for the safe processing of dry particulate materials. The subgroup started in 1998 and since then has published eight documents. Published guidelines • Doc. 22 General hygienic design criteria for the safe processing of dry particulate materials (2001)
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48 Hygienic design of high performa
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62 Environmentally friendly water b
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