Lean Manufacturing and Environment
The Lean and Chemicals Toolkit
Chapter 6: Lean Product and Process Design Methods
On This Page
- Introduction to Lean Product and Process Design
- Add Environmental Design Criteria to Lean Design Methods
- Draw on Design for the Environment Resources to Find Safer Alternatives
- Use Green Chemistry Principles When Designing Chemical Processes
- A Vision for Lean and Chemicals Efforts
Lean product and process design methods are powerful tools for eliminating harmful uses of chemicals in products and processes.
Lean design methods are a group of Lean tools and techniques that aim to:
- Design (or redesign) high-quality products that meet customer needs with the least amount of waste (aspects that do not add value); and/or
- Design (or redesign) processes and equipment that add value to products using the least amount of time, material, and capital resources.
By examining the parts and processes that go into product development, Lean practitioners can identify and correct inefficiencies, improve quality, reduce costs, and potentially gain market advantage.
Lean practitioners use a variety of Lean tools for designing (or redesigning) products and processes. Some of these tools are also used in other types of Lean and Six Sigma improvement efforts (e.g., kaizen events). Table 2 describes several of these tools.
|Production Preparation Process (3P)||An integrated and highly detailed approach to product and/or process development, which involves rapidly designing production processes and equipment to ensure capability, built-in quality, productivity, and flow. 3P minimizes resource needs such as capital, tooling, space, inventory, and time.|
|Design for Manufacturing & Assembly (DFMA)||A simultaneous engineering process designed to optimize
the relationship between design function, manufacturability,
and ease of assembly.
|Design for Lean Six Sigma||A method for designing processes that support Lean Six Sigma objectives, such as reduced variability, to improve yield, reduce waste, and accelerate time-to-market.|
|Value Engineering||An organized methodology that identifies and selects the lowest lifecycle cost options in design, materials, and processes that achieves the desired level of performance, reliability and customer satisfaction. It seeks to eliminate unnecessary costs in the above areas and is often a joint effort with cross-functional internal teams and relevant suppliers.|
|Quality Function Deployment (QFD) and “Voice of the Customer”||An overall methodology that begins in the design process
and attempts to map the customer-defined expectation
and definition of quality into the processes and parameters that will fulfill them. It integrates customer interview and market research techniques with internal cross-functional evaluations of the requirements.
|Failure Mode & Effects
|A design review methodology that focuses on identifying
the potential failure modes of a product, and subsequently
determining ways to mitigate each risk of failure.
The Lean method 3Pone of the most powerful and transformative Lean design methodscompresses the creative design process into a multi-day event. Steps in the 3P process include:
- Define design objectives and form the project team
- Select key verbs to describe function
- Sketch and analyze examples from nature
- Identify at least seven ways of doing the operation
- Build, test, and evaluate the best alternatives (This is done rapidly in the context of an event and is often called “try storming” or “boot legging.”)
- Coordination (called “catch ball”) between product and process design teams (if applicable)
- Evaluate alternatives using design criteria
- Report out presentation and final development of the equipment or product
3P offers organizations the potential to make “quantum leap” improvements in performance, potentially including improvements that eliminate or minimize the use of hazardous chemicals in products and processes.
There are six basic stages in the product development process, as follows.
- Project Definition: This stage explores all aspects of a proposed project to examine the relationship between activities, events, durations, and costs. Areas of uncertainty or conflict are identified, and possible alternatives or trade-offs are developed to strike a satisfactory balance.
- Conceptual Design: This stage describes how a new product will work and meet its performance requirements.
- Design Validation: A test is conducted in this stage to ensure that a product fulfills the defined user need and specified performance requirements.
- Design Review: In this stage, a systematic and comprehensive analysis of a design is conducted to determine its capability and adequacy to meet its requirements. During the design review, present and potential problems with the product can be identified.
- Qualification Process and Pilot Production: In this stage, a product is examined to ascertain that it meets required specifications and upon meeting those specifications, it becomes qualified. After a product is qualified, a production line is set up to produce a pilot product.
- Production Launch: This is the last stage in the product design and production process. In this stage, a product is produced by combining all the tangible and intangible inputs necessary to produce the product.
Table 3 shows which Lean tools are appropriate for different stages in the product development process.
|Project Definition||Conceptual Design||Design Validation||Design Review||Qualification Process and Pilot Production||Production Launch|
|Production Preparation Process (3P)||X||X||X||X|
|Design for Manufacturing & Assembly (DFMA)||X||X||X||X||X|
|Design for Lean Six Sigma||X||X||X||X||X|
|Quality Function Deployment (QFD) and “Voice of the Customer”||X||X||X|
|Failure Mode & Effects
Lean design methods often rely on a set of design criteria or principles for evaluating and ranking alternatives. Incorporating environmental design criteria into Lean design methods can help design teams reduce environmental risks in products (e.g., avoid using toxic chemicals) and environmental wastes throughout a product’s life cycle. For example, a U.S. furniture manufacturer incorporated environmental design principles, such as use of recyclable materials, into the product design criteria it used to develop a new, high-performance office chair using the 3P method. Box 21 outlines several product design criteria that minimize waste and support Lean and environmental objectives.
Product Design Criteria (Box 21)
Product Design Criteria that Support Disassembly, Remanufacture, Reuse, and Recycling:
- Minimize dissimilar materials and number of components
- Use interchangeable parts
- Do not use incompatible inks or surface treatments
- Make hazardous parts components easily detachable
- Make disassembly easy and efficient
- Minimize chemical usage and associated waste or emissions
One important way to ensure that design teams consider potential environmental issues and incorporate precautions to protect worker health and safety is to involve environmental health and safety personnel in Lean design events and projects. The process evaluation questions in Box 22 below can also help guide Lean teams to design safer and less harmful processes.
Process Evaluation Questions from a Chemical Perspective (Box 22)
As your design team is evaluating process alternatives, consider the following questions:
- Is the process safe?
- Is it free of chemical-related risks to human health and the environment?
- Are workers protected from exposure to hazardous chemicals and materials during equipment operation and maintenance?
- After minimizing chemical use and wastes, are hazardous wastes generated by the process? If so, are there any opportunities for reuse or recycling? Are wastes properly disposed of?
- Do any chemicals contaminate water and therefore generate a wastewater stream? If so, how can you minimize those wastes?
Design for the Environment (DfE) is an approach pioneered by industry for incorporating environmental and health considerations into the design and redesign of products and processes. Like Lean design methods such as 3P, DfE aims to eliminate wastes, uses nature as a model, and involves a systematic evaluation of alternatives-based actual performance data.
EPA and other agencies have used DfE approaches to identify safer technologies and best practices for minimizing the environmental and human health impacts of different types of manufacturing processes. EPA’s Design for Environment Program partners with multiple industrial sectors that use and produce chemicals that are harmful to human health and the environment. Through this program, EPA has identified technology alternatives and best practices to help these sectors mitigate the risks of using hazardous chemicals. Example resources from EPA’s DfE program include:
- Lead-Solder Alternatives for Electronics: The DfE program has partnered with the electronics industry to evaluate the environmental impacts of tin-lead and lead-free solders. They developed the “Solders in Electronics: A Life-Cycle Assessment” report that contains the results of the potential environmental impacts of selected lead-free solders as alternatives to tin-lead solder.
- Safer Flame Retardants for Furniture: By partnering with the furniture industry, the DfE program is helping the industry factor environmental and human health considerations into their decision-making as they choose chemical flame retardants for fire safe furniture foam. This partnership developed “Environmental Profiles of Chemical Flame-Retardant Alternatives for Low-Density Polyurethane Foam” report that has information on safer alternatives to flame retardants currently in use.
- Best Practices for Auto Refinishing and Painting: The DfE program has also partnered with the automotive refinishing sector to increase awareness of the health and environmental concerns associated with refinishing activities and to encourage the use of best practices and safer, cleaner, more efficient practices and technologies. The DfE program has several technical documents available that provide guidance and advice on conventional and best practices for using paint in automotive refinishing.
In addition to these efforts, EPA’s DfE Program has many past partnerships with sectors such as:
- Adhesives technology
- Garment & textile care
- Industrial laundry and textile car
- Nail salons
- Printed circuit boards
- Printing industry
- Wire and cable
See Appendix A for additional resources related to reducing chemical use and finding safer alternatives to hazardous chemicals.
For businesses that manufacture chemicals or chemical products, consider using green chemistry principles in product design efforts to reduce additional wastes. Green chemistry is the design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances. Green chemistry applies across the life cycle, including the design, manufacture, and use of a chemical product. Green chemistry technologies provide a number of benefits, including:
- Reduced waste, eliminating costly end-of-the-pipe treatments
- Safer products
- Potential reduced use of energy and resources
- Improved competitiveness of manufacturers and their customers
The following 12 Principles of Green Chemistry provide guidance on how to implement green chemistry concepts. (1)
- Prevent waste: Design chemical syntheses to prevent waste, leaving no waste to treat or clean up.
- Design safer chemicals and products: Design chemical products to be fully effective, yet have little or no toxicity.
- Design less hazardous chemical syntheses: Design syntheses to use and generate substances with little or no toxicity to humans and the environment.
- Use renewable feedstocks: Use raw materials and feedstocks that are renewable rather than depleting. Renewable feedstocks are often made from agricultural products or are the wastes of other processes. Depleting feedstocks are made from fossil fuels (petroleum, natural gas, or coal) or are mined.
- Use catalysts, not stoichiometric reagents: Minimize waste by using catalytic reactions. Catalysts are used in small amounts and can carry out a single reaction many times. They are preferable to stoichiometric reagents, which are used in excess and work only once.
- Avoid chemical derivatives: Making derivatives out of chemicals (e.g., use of blocking or protecting groups, or other temporary modifications) uses additional reagents and generates waste.
- Maximize atom economy: Design syntheses so that the final product contains the maximum proportion of the starting materials. There should be few, if any, wasted atoms.
- Use safer solvents and reaction conditions: Avoid using solvents, separation agents, or other auxiliary chemicals. If these chemicals are necessary, use innocuous chemicals.
- Increase energy efficiency: Run chemical reactions at ambient temperature and pressure whenever possible.
- Design chemicals and products to degrade after use: Design chemical products to break down to innocuous substances after use so that they do not accumulate in the environment.
- Analyze in real time to prevent pollution: Include in-process real-time monitoring and control during syntheses to minimize or eliminate the formation of byproducts.
- Minimize the potential for accidents: Design and use chemicals in appropriate phases (solid, liquid, or gas) to minimize the potential for chemical accidents, including explosions, fires, and releases to the environment.
EPA’s Green Chemistry Program (www.epa.gov/greenchemistry) and Sustainable Futures Program (see Box 23) provide many tools and resources for chemical manufacturers interested in incorporating green chemistry concepts into their product design processes. Appendix A describes a range of resources and tools for finding safer alternatives to hazardous chemicals; these resources are applicable to a broad range of facilities that use chemicals.
EPA’s Sustainable Futures Program (Box 23)
EPA’s Sustainable Futures Program provides chemical developers access to computer-based risk-screening methods and models for the development of new chemicals. Chemical manufacturers can use these tools to detect potentially hazardous chemicals early on in the development process and to find less hazardous substitutes for the chemicals they are producing.
The Sustainable Futures Program provides training to companies on how to use these models to prescreen their chemicals. Companies that participate in this program may also be eligible for expedited EPA review of their chemicals. The program has been successful at encouraging companies to develop safer, less hazardous chemicals.
For more information, visit the EPA’s Sustainable Futures Program website at http://www.epa.gov/oppt/sf.
As described in more detail in the Preface, a guiding vision for Lean and chemicals efforts could include the following two long-term goals:
- Produce high-quality products and services that do not contain hazardous chemicals that customers did not request.
- Develop products that can decompose naturally at the end of their use or become high-quality raw materials for new products.
These goals draw from the “cradle to cradle” design concepts outlined by William McDonough and Michael Braungart. (2) While all the strategies and tools in this toolkit can support these goals, leveraging Lean design methods to eliminate chemical wastes and integrate environmental design principles potentially offer the greatest opportunities to make radical or “quantum leap” improvements to help achieve this vision.
- Does your company use Lean methods of product and/or process design? If so, what opportunities do you see for incorporating environmental principles or criteria into those efforts?
- Have you used Design for Environment or Green Chemistry principles and tools in designing or redesigning products and processes at your company?
- When your company designs a new process or redesigns an existing process, do you consider using or substituting environmentally preferable chemicals, solvents, and cleaners?
- What steps would you take to incorporate environmental design criteria into your facility’s product and process design efforts?