Lego has set a target to use a sustainable resin in its bricks by 2030, replacing ABS, but the search for an alternative will not be easy, according to Allan Rasmussen, the company’s senior project manager.
Not only must the selected material be able to meet the same characteristics as the locking building blocks, they must also blend seamlessly with bricks already in children’s hands.
“I need to find a material that is just as good as this one,” Rasmussen said. “I need to find a material that will be just as good in 50 years, because these are passed down from generation to generation.”
Speaking yesterday (18 February) at Innovation Takes Root 2014 in Orlando, Rasmussen said the sustainability quest is in its early stages, but the Danish company already has tested some bricks using an impact modified polylactic acid are “very, very close”. A problem with a post-moulding “creep”, however, means that a few weeks after they are moulded the bricks do not click and stick together as well as they should.
The ability to stay clicked together until a child separates them – what Lego terms the “clutch power” – is so key to Lego that it has a specific testing system for it.
Some of the issues with those tests may be that the machines are set up to meet the requirements based on ABS and are not compatible with other resins, Rasmussen said, but the clutch power is only one issue facing any replacement.
Lego, based in Billund, Denmark, has been using ABS for its bricks since the 1960s, following a brief period using a cellulose acetate.
It uses more than 6,000 tons of plastic each year – 70% of it ABS, “so that’s why I’m most interested in [replacing] that,” Rasmussen said.
It operates more than 5,000 moulds on more than 1,000 injection moulding presses at global production sites in Denmark, Mexico and Hungary. When Lego expands to Jiaxing, China, it will specifically be to supply the local market there, he said, so the company needs to ensure it has a global material supplier for all those locations once it is ready to change its resin.
It wants a resin that will make both economic sense as well as hitting environmental targets, and wants to ensure that it is coming from a non-food feedstock base so the business doesn’t find itself facing questions about using crops for toys vs. food.
The company also requires dual sourcing, with product available from multiple production locations, so that it can provide resin from another site if there are any problems.
In addition, its toys must meet the standards written within 3,082 pages worth of legislation regulating toys worldwide.
So obviously, there are major supply chain issues Lego must consider before making any material changes.
“If I were to say that we need to change the machines because something has a different shrink rate, I’m not going to be a very popular guy,” he said.
Then add the complications of matching the look and feel of generations of previous production.
Lego has to carefully track colour blending to control colours, so that a red brick moulded today will match a red brick moulded 30 years ago or, for that matter, a red brick the company will make 30 years from now.
“When I get to a conference like this, I always hear people say: ‘Oh, Lego. That’s great. I played with Lego when I was a kid, and now I’ve passed it on to my son and to his son now, and it lasts. It’s perfect.’ And I’m really torn between that,” Rasmussen said. “On the one side, I want to say: ‘Thank you. We make a good product.’ On the other side, I want to say: ‘You’ve just shown why it is my job is so damn difficult’.”
Source: Plastics and Rubber Weekly