JW Winco is a standard parts expert and has worked diligently to bring you a line of hygienic products. What goes into hygienic design? In this post, JW Winco goes over the features, standards, and advantages of hygienic design.
Hygienic Design includes the design principles for the avoidance of design weaknesses, which could favor hygiene-related hazards. The cleaning capability of materials, surfaces, and structural elements are regarded as the central points of Hygienic Design. No dirt of any kind may accumulate or be permanently deposited or must be easily removed.
Reasons for Hygienic Design
In the food industry, medical technology, and the pharmaceutical industry, product safety and consumer protection are becoming increasingly important. Due to their specific properties, standard parts in Hygienic Design can assist the production process in these sensitive areas and facilitate the manufacturing of products free from preservatives that have a long shelf life.
Advantages of Hygienic Design
Minimized and reduced cleaning process (this can be up to 25% of the production time), therefore:
- More time available for production
- Less freshwater consumption
- Lower energy consumption
- Less cleaning agent required
- Less production of wastewater
- Lower total costs and saving of resources
Legal Basis of Hygienic Design
EN 1672-2:2009 “Food machinery”
Machines must be able to be cleaned, i.e. they must be designed and constructed so that dirt can be removed with the recommended cleaning methods.
Machinery directive 2006/42/EC
Machines must be designed so that materials can be easily and fully cleaned before each use and no risk of infections or illness is created.
DIN EN ISO 14519:2008-07
Hygiene requirements for the design of machines
DIN EN 1672:2009-07
Food machinery – General design principles – Part 2
Design Requirements for Hygienic Design
- Non-rusting Stainless Steels
- FDA and EU compliant plastics and elastomers
- Surfaces must be able to be cleaned
- Steps due to appliance configurations that are not aligned must be avoided
- Seals must be designed so that no gaps occur
- O-ring grooves must be hygienically designed
- Contact with the product to be manufactured must be ruled out
- Corners should preferably have a radius of 6 mm or more
- The interior and exterior areas of all appliances, components, or piping must be self-draining or be able to be drained and easy to clean.
Surface properties and roughness Easy to clean with roughness Ra < 0.8 μm
Design Principles for Hygienic Design
- European Hygienic Engineering & Design Group
- A non-profit European consortium of machine and food manufacturers as well their suppliers, research institutes, universities, and government health agencies
- Approximately 45 guidelines
- Examination of products and issue of certificates
3-A Sanitary Standard, Inc.
- Non-profit and independent association in the USA
- Three interest groups: public and governmental health agencies, machine and food manufacturers
- Over 70 Sanitary Standards
- Examination of designs and processes, issue of certificates
Seals have the central function of protecting dead spaces, gaps, and cracks from the penetration of cleaning fluids or product residues.
For this, a defined pre-tension or compression of the seals and wipers is necessary for a reliable and permanent seal in the installed condition. Within the Hygienic Design product family, seal installation spaces and seal cross sections are calculated and designed with simulation software so that the necessary surface compression is achieved on installation and the seal material is not subjected to excess pressure.
A fundamental differentiation can be made between static and dynamic seals (moveable): The static seal, application examples below, show the top faces the mounting surface (sealing ring) and the bottom faces the contact surface (bottom seal) so that the corresponding pressure is achieved by tightening. It should be ensured that all surfaces which make contact with the seal have a surface finish of at least Ra 0.8 µm.
The dynamic seals (moveable) on the adjustable sleeve (wiper) and the ball joint (joint sealing ring) of the foot are designed so that they allow adjustment in both height and angle. Because of this design, the installation space together with the cross-section of the seal ensures a gap-free, pre-tensioned seal. Depending on the version and the type of use, it may be the case that seals may need to be replaced in case of damage or for preventative maintenance. For this, JW Winco supplies the relevant seals as spare parts or offers these under GN 7600 as standard parts for spare parts.
MISUMI now offers JW Winco’s hygienic line which you can explore here. Check out JW Winco’s cleanability test video below.