The use of steel barrel sealant for food packaging

The steel drum sealant for food is cured to form a sealed packing for the drum packaging container. It is filled in the middle of the barrel bottom (item) and barrel seam. When the seam is sealed by the curling, the film is sealed and curled. The compaction tightly binds the bottom (item) and the barrel. It is very important to guarantee the sealing performance of the drum container, prevent the infiltration of external microorganisms and air, and enable the long-term storage of the drummed food without deterioration. Second, the quality of food on the steel drum sealant In addition to the food drum sealant can play a sealing role, it must also meet the steel drum production and food packaging on a series of mechanical, chemical and physical process requirements, it must also There are other special conditions. The general requirements are as follows:
(1) It is required to be non-toxic and harmless. The film cannot contain substances that are harmful to the human body and must meet food hygiene requirements.
(2) It is required not to contain impurities, and it should have good plasticity, so as to facilitate filling the gap between the bottom (item) of the bucket and the crimping seam of the barrel body, thereby ensuring the sealing performance of the steel drum.
(3) It should have good adhesion and wear resistance when combined with the surface of the bucket.
(4) The film should have good heat resistance, water resistance, oil resistance, oxidation resistance, and other corrosion resistance, ensure that the food is hot and insoluble, does not fall off, and still maintain a good sealing performance, especially the thermal stability must be Good, otherwise it will melt at high temperatures, causing plastic flow within the barrel and contaminate the food.
Third, the type of food packaging container sealant and composition characteristics Food drum sealant is generally a liquid rubber, is injected in the bottom of the barrel (top) on the edge of the pre-rolling groove curing film. The liquid rubber used as the steel drum sealant is divided into water-based glue and solvent glue according to its different dilution conditions. Water-based adhesives are easier to formulate with ammonia glue, and they are cheaper and can meet various requirements. Generally, sulphurized latex is used in the country, and alginate latex is used in some places. The use of solvent glues is rare and is not recommended because of its toxicity.
The main component of ammonia glue is natural latex. It is a colloid composed of rubber particles suspended in an aqueous medium. The chemical structure of latex is isoprene C5H8 or isoprene polymer C10H16. The role of the straight sealant in the drum seal packing.
In addition, in the composition of the steel drum sealant, there are also a variety of other auxiliary materials as the compounding agent, such as sulfur, kaolin, casein, accelerator TMTD and so on. The compounding agent can improve the performance of the liquid glue. With the addition of various compounding agents, the sealant can better meet the requirements of the steel drum manufacturing process. At the same time, due to the addition of a large number of fillers, it is beneficial to reduce the surface tension of the latex, so that the glue can be evenly coated in the pre-winding groove at the bottom of the barrel when spraying.