Usually, the sealing form of the sealing machine has a close relationship with the packaging container. The variety of packaging containers is varied. For the materials used to manufacture containers, there are paper and paper products, plastics and composite materials, as well as metal sheets, glass, ceramics and wood. In terms of the shape of the container, there are bottles, boxes, boxes, cans, and the like of different shapes. If divided by the rigidity of the container, there is a distinction between a rigid packaging container and a flexible packaging container. The form of closure described below is for the closure of rigid packaging containers. Common packaging containers are made of metal cans, glass bottles and plastic bottles. According to the different sealing methods of rigid containers, the following six types of sealing are mainly used:
1, crimp sealing
The seal formed by the manner in which the can lid and the periphery of the can body flange are formed by crimping each other is referred to as a crimp seal. Cylindrical metal cans that are widely used in food cans and beverage packaging are sealed in this form. In order to prevent the joint portion of the seal from leaking, a glue (made of rubber or tree sap material) is generally applied to the concave edge of the cover, and is crimped and clamped in the seam to enhance airtightness.
2, gland sealing
The seal formed by the corrugation around the crown of the crown-shaped dome and the flange of the bottle mouth is called a gland seal. The seal is sealed by a rubber or cork-lined elastic gasket between the cap and the end of the bottle mouth. The gland seal is reliable and easy to unsealing. It is a carbonated liquid beverage - beer, soda and A common form of closure when wine is packaged in glass containers.
3, pressure plug sealing
The cork which is pressed into the bottle mouth is formed by the elastic deformation of the bottle to form a tight seal of the bottle mouth, which is called plug sealing. The cork is usually made of cork, rubber and plastic with certain elasticity, and its structure and shape are respectively different. The stopper seal can be used for direct sealing or combined sealing with the cap. In order to improve product sealing and extend the shelf life. Direct sealing is often used for the sealing of bottled soy sauce, vinegar and other liquid foods. Combination sealing is often used for the sealing of bottled high-grade wines, medicines and toxic products.
4, rolling seal
A sealing method for rolling a thread that is exactly the same as the shape of the thread of the bottle by an aluminum cover that is placed over the mouth of the bottle is called a embossed seal. Since the aluminum cover will be broken along the pre-formed indentation around the skirt when unsealing, the cover of the seal is called a twisted cover: because the seal is easy to identify the unsealing or not, the cover is named abroad. It is a "anti-theft cover". The twisted cover for the sealing has two forms in design: a mark which is embossed only in the circumferential direction of the skirt, and after sealing, as long as a certain rotational moment is applied in the opposite direction to the thread, The cap is twisted along the surrounding indentation, but the bead ring is still placed on the bottle neck, making the bottle inconvenient to recycle: another newly designed aluminum cap has indentations in the circumferential and axial directions of the skirt, unsealing After that, the crimping ring is disconnected by the circumferential and axial indentations to facilitate the recycling of the old bottles. The embossed sealing not only has the advantages of strict and reliable sealing, convenient opening and unpacking, and beautiful appearance of the packaging. Moreover, since it can identify whether the products in the bottle have been used, it is especially suitable for sealing the glass bottles of high-grade wines such as wine and brandy. For the sealing of plastic bottles like Pepsi.
5, piping sealing
The bottom edge of the cylindrical metal cover is deformed and pressed against the lower end surface of the bottle neck flange, which is called a sealing seal. The annular elastic rubber pad between the bottle neck flange and the bottle cap enables the sealing to be obtained. Reliable seal. This type of closure is commonly used in jars for food cans.
6, screw cap sealing
The seal formed by the screw connection between the cap and the container is called a cap seal. The seal is elastically deformed by a gasket between the bottom of the lid and the mouth of the bottle or a stopper placed in the mouth of the bottle when the cap is rotated, and is sealed.
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