Julian Ryall:

Counterfeit diapers are damaging both the reputation and bottom line of Japanese manufacturers in China, with companies in Tokyo calling on local authorities to act.
The booming Chinese market is proving a lucrative one for Japanese firms such as Daio Paper, which makes the hugely popular Goo.n line of disposable diapers. And because they are superior to Chinese products, that has elevated them to the status of a luxury product.
That popularity, however, has made them a target for the fakers.
The quality of the copies – the diaper looks like the genuine article and the packaging is indistinguishable – means that the counterfeiters can charge almost the same price as the real thing, between 155 and 185 yuan (HK$234). That figure is double the price in Japan, underlining the importance of the Chinese market to Japanese firms.
It is only when the diapers are put to the test that the differences become clear. The copies are made of a rougher material and absorb less liquid.
This has caused big problems for companies such as Daio Paper, as angry parents complain about the quality of diapers that they believed were genuine products.