There is a fatal weakness in the glass bottle packaging, which is that the crown cap cannot be re-sealed. Many glass bottles have now been improved in terms of caps, and plastic caps have been used to facilitate their use. Some manufacturers also have a plastic cover attached to the bottle neck of the crown cap. In this way, after the crown cap is opened, it can be replaced with the plastic cap.
In the early days, glass bottles were the only choice for liquid seasonings due to their transparency, good barrier properties, low price, and ease of reuse. In recent years, although plastic bags, PET bottles and sunken buckets have entered the liquid condiment market one after another, glass bottle packaging still occupies a dominant position.
Small-capacity liquid seasonings such as mustard oil, chili oil and certain high-grade raw soy sauces are still mainly used for glass bottles. However, all plastic caps have been used. There is no ideal alternative packaging for this market.
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