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Structure of food packaging container

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there are several common bottle caps (Figure 2): ① crown cap. Initially made of aluminum, it is made of tinned sheet and chrome plated sheet, lined with PVC plastic pad. It is mostly used for the packaging of beer, soft drinks and condiments. ② Screw cap. The metal screw cover is made of aluminum plate or tinned sheet and lined with PVC pad. It is mostly used for packaging solid drinks in wide mouth bottles. The plastic screw cap is made of polyethylene, polyvinyl chloride and other resins. It can be used for packaging wine, fruit juice drinks, condiments and solid drinks in fine mouth bottles or wide mouth bottles. ③ Twist off the threaded cap. Also known as anti-theft cap, because there is an indentation at the lower end of the cap, the cap can be broken along the indentation line when opening to show that the cap has been opened. The cover is an improvement of the screw cover. It is made of aluminum plate and lined with cork, paperboard, aluminum foil and plastic film. It is mostly used for the packaging of grape wine. ④ Unscrew cover. Also known as four screw cover. Made of tinned or chrome plated sheet. According to the diameter of the bottle (27 ~ 110mm), there are 3, 4, 6 and 8 claws on the edge respectively, lined with PVC plastic pad. It can be used for packaging fruit juice, jam, fruit, baby food, vegetables and meat in fine mouth bottles or wide mouth bottles. ⑤ Unscrew the sealing cap. Also known as thermoplastic threaded cover, press in – unscrew the cover. It is a new variety developed in the 1970s. Made of tinned or chrome plated sheet. There is a plastic lining around the cover. When filling the can, it is sealed by hot pressing. After cooling to room temperature, the plastic lining is formed with the multi thread of the bottle mouth. It is characterized by high sealing speed, good sealing and convenient opening. The bottle cap has a series of 27 ~ 77mm, which is suitable for the packaging of a variety of foods. ⑥ Bite the cover. Also known as grab cover. Made of sheet metal. Designed to seal the annular glass bottle mouth. When the cap is pressed into the bottle mouth, the pressure generated by the metal flange around the cap and the bottle wall makes the cap firmly press on the bottle mouth, and the liner in the cap plays a sealing role at the same time. The bottle cap diameter has 28 ~ 77mm series. It can be used for fruit juice, jam, fruit and other food packaging. ⑦ Side cover. Also known as prying open the cover. It is a press in cover. Made of sheet metal. There are rubber gaskets around the cover with sealing function. Suitable for annular glass bottle mouth or glass cup. Tools are needed to open the cap. The pried cap can be pressed back on the bottle mouth to re close the bottle. The bottle cap diameter has a series of 27 ~ 77mm. It can be used for packaging fruit juice, fruits, vegetables, etc. ⑧ Roll up the cover. Also known as victory bottle cap. Made of tinned sheet. The inner edge of the cover is provided with rubber gasket, which has good sealing performance. It is suitable for the packaging of fruits, vegetables and meat food. The disadvantage is that it is difficult to open the bottle cap

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