Offset printed tin containers can be produced as square shape, the square tin cans are suitable for edible oil or mustard oil. Screen printed tin containers are produced based on food grade standard. 15-18 liter square tin containers can be made by GR can line. 

Mustard oil is a kind of seasoning oil obtained by diluting mustard essence obtained from yellow mustard seeds and then diluting it with the remaining oil extracted from mustard cakes. It is commonly known as mustard oil or mustard seasoning oil. Mustard oil has a strong pungent taste. The main spicy ingredient is mustard oil, commonly known as mustard essence, also called food-grade allyl isothiocyanate (chemical name). It has a strong spicy taste and can stimulate the secretion of saliva and gastric juice. It has the effects of appetizing, sterilizing and anti-inflammatory, and can also enhance appetite. In addition, it has the effects of detoxification and beauty.

Mustard oil has a unique pungent smell and spicy taste, which can relieve greasiness, improve appetite, etc. There are two main processes for producing mustard oil in China: one is to use the principle and equipment of distilled wine, crush the mustard seeds roughly, stir-fry, statically distill, extract the essential oil, and then blend it with vegetable oil; the other is to crush the mustard seeds, make them wet, and dynamically distill them in a stainless steel reactor with a stirrer and condenser, extract the distillate with vegetable oil, and refine it to get the finished product. The latter has a higher yield of essential oil than the former.