The bottle mouth seal is really a difficult problem to solve. Everyone comes up with the idea. Because the sealing position is only at the mouth of the bottle, the threaded part is not sealed. From the production to the consumer's drinking process, many factors will make the threaded part of the bottle mouth. Produces pollution. For example, during the filling process of eutrophic beverages, the beverage splashes to the threaded portion of the bottle mouth. Under the action of bacteria and air, the bottle thread appears moldy and accumulates color spots; or the bad environment of transportation and storage causes the original clean. Bottle thread contamination, for example, when the beverage is sold for a long time in ice water.
Many consumers will experience the dirt on the thread at the mouth of the bottle after opening the bottle cap. Because the bottle cap is already open, the effect of the complaint is limited, so they have to be unlucky. From the point of view of drinking habits, most consumers do not use straws when drinking plastic bottled beverages. The mouth is directly included in the mouth, and the contaminants at the threads will enter the body. This phenomenon is particularly prominent in children.
In fact, many beverage manufacturers are facing this problem, and they are also taking various measures to solve, such as controlling the filling volume, reducing the vibration of filling to the cover, and cleaning the bottle before sealing, but still from time to time. This problem has arisen, and the current methods cannot be solved at all. For example, the full liquid level and overflow required for hot filling is a contradiction. Sometimes the product of this defect is even more than 1%. The manufacturer often has internal recycling of the product because of this problem. In addition, the pollution in the transportation and sales process is difficult to control, and there are many products that end up flowing to the consumer, causing complaints. , seriously affecting product reputation.
From the above analysis of the cause of the defect, the problem is mainly that the threaded portion of the bottle mouth is not sealed. From the food packaging on the market, there are already some designs that protect the consumer from direct contact with the parts, such as the rubber cover on the eight-treasure porridge, but these packagings It is added, the sealing effect is general, and the cost is increased. There is no such protective packaging in plastic beverage bottles. So is there a simple and cost-intensive package? We propose a practical and feasible approach. There are two main types of plastic beverage bottle seals mentioned above. One is the top seal in the bottle cap. The seal has one type of molding and two (two pieces of cover). The second is the sealed inner plug of the bottle mouth. The sealing gasket seals against the extrusion deformation of the gasket by the top of the bottle mouth; the inner plug is sealed by the interference fit between the outer diameter and the inner diameter of the bottle mouth. Due to different principles, the gasket cap can withstand the pressure inside the bottle. Currently, it is used in a variety of beverage plastic bottle packaging. The inner cap is relatively more used in the bottle with less or less pressure. Varieties, such as most current hot-filled beverages, have a sealing performance that is related to the inner diameter of the inner plug and the inner diameter of the bottle mouth, and the inner plug material.
From the perspective of the production process, the inner cap is simple in process, low in cost, and has little change in reseal tightness, so it is widely used in non-carbonated drinks. From the sealing principle, the sealing property has nothing to do with the final tightening torque of the cap. The actual tightening torque required for the actual production of the cap only prevents the cap from being accidentally returned. Therefore, we can obtain the required bottle thread seal by improving the inner plug seal.
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