A US customer came to us with a problem from an existing headlamp strap. They had already produced the 25 mm printed elastic strap, but after some use, part of the straps started losing their elastic recovery. Some of the failed straps were also curling.
The customer wasn’t starting a new strap from zero. They already had the dimensions, components, logo, printing method and assembly setup. What they needed from us was to find out why only part of the existing straps were failing, then develop replacement straps they could test before moving forward.
The customer had already produced this headlamp strap before coming to us. It used 25 mm printed elastic webbing with their own logo, and the webbing was cut into two lengths — 290 mm and 673 mm — for assembly with the headlamp components.
The problem appeared after the straps had been in use for some time. Some of them gradually stopped returning to their original length after being stretched. Others also started to curl, making the strap difficult to use properly on the headlamp.
It wasn’t happening to every strap. Only part of the previous production was showing the problem. Because the failure wasn’t consistent across the production, we didn’t want to assume that the elastic specification itself was the problem.
The customer shared the original webbing specifications and production information with us, along with photos and videos showing how the failed straps behaved. They also told us when the failures had started appearing after use.
More importantly, they cut open several of the failed straps so we could see what had happened inside the webbing. That gave us much more to work with than simply knowing that the elastic had “lost its stretch.”
Before changing the webbing or making new samples, we first went back through the original specifications and production process to see where the failure could have started.
We started by going back through the information from the customer’s previous production. They shared the material, elastane ratio, width, thickness and webbing construction, as well as the printing method, silicone printing method and the full process used to produce and assemble the straps.
Nothing in the original webbing specification stood out as an obvious reason for the failure. Because only part of the production had failed, the webbing specification alone didn’t explain the failure pattern. We needed to look at what had happened to the elastic later in the process.
The cut-open straps gave us a much stronger clue. From the photos and videos, we could see that the elastane inside some of the failed webbing had been visibly damaged and partially melted.
We then compared that physical evidence with the customer’s production process. We knew where the webbing had been exposed to heat during printing, and the condition of the damaged elastane pointed to excessive heat during that stage as one likely cause of the lost recovery.
The curling gave us another clue. Some of the failed straps showed uneven recovery rather than simply becoming loose. When we compared this with the assembly process the customer had shared, we found another likely damage point: some of the internal elastane could have been cut or damaged during sewing.
By this point, simply changing the original webbing specification wouldn’t have addressed what we were seeing. The two areas we needed to deal with first were the printing process and the way the straps were assembled.
The damaged elastane inside the failed straps gave us a clear place to start. We focused the changes on the material and production stages connected to the damage we had found.
For the replacement webbing, we changed the conventional elastane to a more heat-resistant silicone elastic yarn. We also tightened the heat control during printing after seeing the heat damage inside the customer’s previous straps.
Assembly was the other part we needed to address. When we compared the curling with the customer’s previous assembly process, sewing became the second area we needed to address. We suggested changing the sewing method, or alternatively, having us complete the assembly before shipment.
The customer chose to have us supply the fully assembled straps.
We also changed how we checked recovery before assembly. Instead of stretching the webbing once and seeing whether it returned, we repeatedly stretched and released it to check whether the recovery remained stable.
At that point, we had addressed the areas connected to the failures we had found. But we still didn’t want to put all 1,000 sets into production at once.
The original problem hadn’t appeared immediately when the previous straps were made. It showed up after the straps had been used for some time. That meant a normal production inspection wasn’t enough for us to judge whether the changes had really solved the problem.
After changing the internal elastic yarn, tightening the printing heat control and taking over the strap assembly, we didn’t move directly into the full 1,000-set order. We first produced 100 fully assembled sets using the revised process.
The 100 sets went through the revised printing, cutting and assembly process and were supplied as complete straps, rather than as loose webbing samples.
The customer then tested those 100 sets for one month. The main thing we were waiting to see was whether the two problems from the previous production would return after continued use — loss of elastic recovery or curling.
During that month, neither problem appeared again.
That result gave us the confirmation we needed to continue. We then completed the remaining 900 sets using the same revised material, printing and assembly process, and supplied them fully assembled.
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