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Soy sauce and vinegar can be regarded as representatives of liquid seasonings. There are many kinds of seasonings such as cooking wine and seasoning oil. In the planned economy, glass bottles were once packaged with soy sauce and vinegar. It can be said that liquid condiments are still one of the last few positions in glass containers. Glass bottles do have their advantages: transparency, good barrier properties, low price, and ease of reuse. In recent years, the situation has undergone great changes. The pattern of dominating the glass bottles has been broken. Plastic bags, PET bottles, and sunken buckets have entered the liquid condiment market one after another.
The packaging of paste-like viscous articles is divided into two categories: bags and bottles. Low-grade sauces are packaged mainly in plastic bags. Some medium-to-high-end seasoning sauces such as chili sauce, tomato sauce, and various kinds of jams are all packed in glass bottles and are equipped with plastic caps to facilitate multiple opening and closing. Some sauces also have aluminum plastic sealing film to extend the shelf life. Shaped bottles mainly appear in some high-end sauce packaging, such as salad dressings. Small-capacity packaging sauces, such as ketchup used in fast food restaurants, are basically made of aluminum-plastic composite packaging. The low-grade sauces packed in plastic bags can be used in the sauce packaging machine produced by our company, for high-end bottles. Foods, such as paste-like fillers, pastes, and liquid filling machines are available.
PET bottles are similar in size and capacity to glass bottles, but they are lighter and have better gloss than glass bottles, and have caps that can be used repeatedly. PE buckets have a large capacity and are suitable for occasions where consumption is relatively fast. The combination is also very good; and Xing bags provide better economics.
Although the glass bottle packaging still occupies a dominant position, it is worth mentioning that in the past, the single crown cap closure style on glass bottles has changed. It can be said that the imperfection of the crown cap is the fatal weakness of the glass bottle packaging. 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 benefit bottle hanging in the crown cap glass, so that after opening the crown cap can be replaced with this plastic cap repeatedly.
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.