Hollow container manufacturing method

Abstract

The invention relates to a method for manufacturing a hollow container, comprising: injecting raw materials into a hollow body, the body at this time has a first volume; blowing air from the first end of the body into the body with a first air pressure, and the body The second end of the green body is suspended in the air, and the green body is inflated to have a second volume; the green body is located in the mold, and the green body is blown into the green body with the second air pressure, and the green body is inflated to have a third volume, and the outer wall of the green body fits the mold. the inner wall; wherein, the first air pressure is less than the second air pressure. A hollow container with a thin wall can be produced, with less material, low production and use costs, and a thin and soft wall that is easy to fold and compress. When used for food packaging, it can be used for one-time use, avoiding sanitary hazards caused by recycling and reuse.

Description

technical field [0001] The invention belongs to the field of packaging, and in particular relates to a method for manufacturing a hollow container. Background technique [0002] Drinking water is an indispensable and important substance to maintain human existence. Drinking water is an indispensable thing for people every day. The quality of water is closely related to human health. The more common practice now is to drink bottled purified water. Usually drinking water buckets are made of polycarbonate (PC) material. The traditional method is to use injection molding, stretching, and blow molding to make them. For large-volume buckets, the barrel blank is stretched during the molding process, and the thickness of the barrel wall is easy to vary. uniform, easy to deform and break, in order to reduce the scrap rate, the wall of the bucket is usually made very thick, and the wall thickness can reach 2-3mm, which consumes a lot of raw materials. The process consumes a lot of e...

AI Technical Summary

Problems solved by technology

Usually drinking water buckets are made of polycarbonate (PC) material. The traditional method is to use injection molding, stretching, and blow molding to make them. For large-volume buckets, the barrel blank is stretched during the molding process, and the thickness of the barrel wall is easy to vary. uniform, easy to deform and break, in order to reduce the scrap rate, the wall of the bucket is usually made very thick, and the wall thickness can reach 2-3mm, which consumes a lot of raw materials. The process consumes a lot of energy

Moreover, for the commonly used 5-gallon water bucket, its volume is large, the materials used are many, the production cost and the use cost are high. In order to save costs, merchants usually recycle the old bucket, and refill the old bucket with drinking water for sale after cleaning.

There are many disadvantages in the multiple recycling of water buckets: First, the cleaning process inside the water bucket is complicated and not easy to clean, especially the high-temperature disinfection method is often used in the recycling process of PC buckets, which is more likely to cause the precipitation of bisphenol A, which is harmful to the human body The second is that the discharge of cleaning materials and cleaning fluids on the spot leads to pollution of water sources; the third is that recycling bins are easily used by unscrupulous merchants, resulting in the flooding of counterfeit brand water and unqualified water in the market

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