That's interesting, I haven't encountered old Chinese film, but I have purchased Soviet Union 35mm packaged in foil with no cassette. They were doing this into the 90s before their dissolution.
I understood this was done so the (cash-strapped) end user could reuse their own cassette without needing to buy a bulk loader and 30.5 (or even 15+) meters of film. The assumption seemed to be that if you shot 35mm, you had at least a crude darkroom available to load the film into a daylight tank and reload your cassette.
