Function type and use of the hottest sealing mater

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Functions, types and uses of sealing materials

sealing materials are materials that seal the packaging containers containing articles. Sealing means sealing and sealing. The functions of sealing materials are as follows:

① prevent the internal contents from escaping and leaking. For example, after the beverage is bottled, seal it with a bottle cap

② ensure the product quality. For example, after the food is bagged, seal it with adhesive to ensure the food quality

③ improve the strength of the packaging container. For example, after the wooden box cover is sealed with nails, it becomes a closed whole, and the strength is greatly improved

④ prevent the contents from being stolen and polluted, such as sealing the bottle with an anti-theft cover

⑥ it is convenient for storage and transportation. After sealing, the articles are not easy to disperse and are not easy to be damaged during storage and transportation

there are several commonly used sealing materials:

(1) adhesive

adhesive is a widely used sealing material. It has good sealing effect and simple operation. It is mainly used for sealing paper containers, plastic packaging bags, composite packaging containers, etc. The types and properties of adhesives are described above

(2) cover type

there are many kinds of covers, most of which are made of metal and plastic. The commonly used ones are as follows:

① screw cover. There are continuous threads on the inner surface of the cylinder, which can be sealed by meshing with the external threads of the bottle mouth or neck of the container. The opening and closing is very simple and widely used

② main canopy. It is cheaper because it looks like the king's crown. The cover edge is corrugated. When the capping machine presses the cover located at the mouth of the bottle, the surrounding of the corrugated shape shrinks inward and is stuck on the convex edge to form a seal. Because there is a sealing gasket in the cover, it has good sealing performance. It is mostly used for sealing soda, sparkling wine and beer bottles, but it can't be used after opening

③ quick screw cap. There are four bulges with equal spacing on the inner circumference of the cover, which mesh with the discontinuous external thread of the bottle mouth, which is equivalent to four head thread. It can be unscrewed or tightened within less than one turn. It is widely used in large mouth cans, such as chili sauce, fermented bean curd, canned pickles, etc

④ rolling cover. It is mostly made of aluminum. Originally, there was no thread. When packaging, the cover was sleeved on the bottle mouth, and the machine was used to roll the corresponding thread on the cover according to the thread of the bottle mouth, so as to form a seal. It is mainly used for high-end grape wine packaging

⑤ anti theft cover. When the cover is opened, the whole cover is damaged, which can show that the cover has been opened. If an anti-theft ring is made at the lower part of the rolling cover, it is tightly fastened on the convex edge. When the cover is opened, the ring is separated from the cover, which indicates that the package has been unpacked. For example, high-end alcohol and cola drinks are often covered with anti-theft covers

5.2 the purchased parts must have sufficient documents to prove their qualified quality or can be applied only after passing the factory inspection ⑥ easy to open cover. This is a kind of metal can cover with nicks on the opening part. It is equipped with lifting accessories, which can be opened by hand. There are pull ring, pull piece, button and other forms, which are mostly used for the packaging of high-end drinks, beer and so on

⑦ child safety cover. The structure of this cover makes it difficult for the vast majority of children under the age of 5 to open in a short time. The container containing harmful substances is equipped with this cover, which is safer for children,

⑧ metal thread cover. It is made of steel, with external thread on the cover and hexagonal top. It has high strength and is mostly used for large metal barrels. It can be opened and closed with a wrench and can be used repeatedly

⑨ matching cover. It relies on the matching relationship between the cover and the container to seal it. It is a clearance fit, which is simple to use, but has poor sealing performance. It is suitable for items with low sealing requirements, such as cooling oil

⑩ glass cover. It is a grinded bottle cap with taper made of frosted glass. It has good sealing performance, easy to open, and can be used repeatedly. It is mostly used for sealing chemicals and high volatile substances

(3) nails

nails are the main sealing materials in the sealing of wooden and paper containers. The products of nails are divided into lever 4-ball experimental machine and hydraulic type from different loading, mainly including the following:

① grain nails. The nail head has a checkered pattern, which is the most commonly used nail sealed with wooden containers

② tack. Also known as shoe nails, the head is large and thin, and is mostly used for thin-layer materials, such as plywood

③ batten nails. The nail head is slightly larger than the grain nail. The nail head is smooth and no grain. It is used for wood packaging

④ bamboo nail. The nail body is bamboo shaped, and the nail tip is sharp edge shaped, which is used for splicing and fixing flat joints of wood packaging

⑤ wood screw. There are two kinds of nail bodies, cylindrical and conical, with large pitch threads on them, and the head is round, square, hexagonal, etc., which are used for wood packaging

⑥ hold the nail. Also known as adhesive nail, coating resin and other adhesives on the nail body can increase the fastening force of the nail on the wood

⑦ split rivet. The rivet tail part is divided into two forks, which can be used to reinforce the packaging after riveting, and can be used for splicing and fastening of metal packaging

⑧ clip. Similar to staples, there are two commonly used types: zonal type and U-type. The strip-shaped clip nail is to stick the clip nail into a strip with plastic, which can be supplied in rolls and is convenient to use; The U-shaped clip is U-shaped and glued into strips, dozens of which are one. The nail is galvanized to prevent rust; Soft, good connection strength, suitable for mechanized operation, suitable for the sealing of cartons and corrugated cartons

(4) tape

and reflects the shape of particles and the nature of wear. Tape is a widely used sealing material. The adhesive is coated on paper, plastic, cloth or composite materials and rolled into coils to form tape. The adhesives used are water-soluble, solvent-based, hot-melt and pressure-sensitive. When in use, adhesive tape is bonded to the sealing of packaging materials or packaging containers, such as the sealing of cartons and cartons, and it can also be used for binding and bundling of packaging items. In addition, adhesive tape is also widely used in other fields

(5) other sealing materials

① bottle stopper. It is made of cork, rubber, plastic, etc., and is mostly used for the inner cover of narrow neck containers

② cover gasket. In order to seal the lid and container reliably, rubber and plastic gaskets, such as beer lid, are often added to the lid

③ wax. In order to ensure the sealing of packaging containers, molten wax is often applied to the sealing place, which is particularly effective for volatile materials

④ bag convenient sealing materials. There are mainly clips, sleeves with lifting rings and press ties; Twisted tapes, pull locking edges, fastening strips, etc. are mostly used for sealing plastic bags, which can be easily opened and closed

⑤ bottle mouth cover. Heat shrinkable plastic, such as vinyl chloride and polyethylene, is made into a film sleeve, which is sleeved into a cylindrical shape. After the bottle is capped, it is sleeved. After heating, the film shrinks and tightly wraps the bottle mouth

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