After the product is packed in the packaging container, in order to keep the product sealed, to maintain product quality, to avoid product loss, the need to seal the packaging container, this operation is done on. Refers to the packaging container containing the product, the container sealing the machinery.
There are many materials for the production of packaging containers, such as paper, plastic, glass, ceramics, metal, composite materials, and the packaging container shape and physical properties are also different, therefore, the use of sealing and sealing device is not the same. Generally according to the mechanical properties of packaging materials, it can be divided into the following two categories:
(1) flexible container sealing device
Flexible containers are made of flexible materials, such as paper, plastic film, composite film made of bags of containers. This kind of container sealing and bag making, filling constitute a joint machine, rarely used independently, due to different materials, the sealing device is not the same.
① paper bag sealing device. For paper materials, generally used in the sealing at the adhesive, and then applied to the mechanical pressure sealing.
② plastic film bags and composite film bag sealing device. Many plastic has a good heat-sealing, plastic bags made with such plastic bags or composite bags, generally used in the sealing directly heated and applied mechanical pressure, so that the fusion seal.
(2) Rigid container sealing machine
Rigid container is the shape of the container after the container is not easy to change the shape of the closure of the use of different forms of the lid, commonly used in the following several.
① screw cap. This kind of cover in advance to work out the internal thread, the thread has a single head or long points. If the bottle with a single head thread, canned bottles with multi-head thread. The machine is by rotating the cover, and its pressure in the container mouth.
② roll. This kind of cover is made of aluminum and has no thread in advance. It is rolled with aluminum roller, so that it has the same thread as the thread shape of the bottle, and the container is sealed. This kind of lid in the unsealed will be along the skirt around the indentation off, and can not be restored, it is also known as "anti-theft cover." The machine is used for high-grade wine, beverage packaging.
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