The basic concept and classification of metal box packaging

The basic concept of metal packaging

Metal packaging containers are metal utensils used for storage, transportation or sales, and are an important type of commodity packaging. The main varieties of metal packaging containers are printed iron products (tins, boxes), three-piece sealed cans, cans (aluminum two-piece cans, tinplate two-piece cans, tinplate three-piece cans), pails, square barrels, steel drums, aluminum cans , Aerosol cans, metal boxes, metal hoses, aluminum foil bags and metal container accessories, including bottle caps, can caps, closures, etc., are widely used in food, beverages, cans, grease, chemical raw materials, medicines, cosmetics, and cultural goods And other packaging.

01. Name of metal packaging container

(1) Metal can. Containers with smaller capacity made of thin metal plates are available in sealed and unsealed categories. They are generally made of tin-plated steel, chrome-plated steel, and aluminum. The volume is generally less than or equal to 16L, the maximum nominal thickness is 0.49mm, and the cross-section has many shapes, such as round, oval, oblate, square, etc. Mainly used for the packaging of food, beverages, tea, cosmetics, stationery and medicines.

(2) Metal aerosol. Refers to a metal container composed of a gas-tight metal shell and valve that can withstand a certain internal pressure. There are generally two types of spray containers, divided into multiple use and one-time use. The product forms sprayed from the spray container include mist, foam, paste and other forms. It is mainly used for packaging of food, medicine and cosmetics.

(3) metal drum/keg. Large-capacity metal container made of metal. The cross-sections are mostly cylindrical, but also square and elliptical. They are mainly used for packaging products such as grease, fuel oil, calcium carbide, antifreeze, and paint.

(4) metal box/case/chest. A packaging container made of metal with a certain rigidity, usually a rectangular parallelepiped, is a box-shaped container with a large volume. It is often used with buckle cover and chain cover, mainly used in military supplies packaging and transportation packaging of some special commodities.

(5) Metal carton/box. Packaging containers made of metal and with a certain degree of rigidity, with various shapes. Generally, the height is relatively low, and the cross-sections are square, round, oval, heart-shaped, etc., usually with a box cover. It is mostly used for the packaging of children's food, stationery and cosmetics.

(6) Metal collapsible tube. Cylindrical metal container made of flexible metal material. One end of the hose is folded into a pressure seal or welded seal, and the other end forms a tube shoulder and a nozzle. When the tube wall is squeezed, the inner material is squeezed out by the nozzle. It is mainly used for the packaging of toothpaste, pigments, medicines and other paste-like commodities.

(7) Aluminum foil bag. A bag-shaped container made of aluminum foil. It can be used as a packaging lining or as a separate packaging product. For example, it can be used for tea packaging, which can prevent moisture, mildew, freshness and taste.

(8) Metal basket. A porous packaging container made of metal wire, usually a cylinder (also called a metal basket) or a rectangular parallelepiped.

(9) Metal tray. A shallow packaging container without a lid made of metal materials.

(10) closure. A set of closure devices added to the container, its purpose is to keep the contents in the container and prevent the contents from being contaminated.

02. Examples of structural names of various parts of metal packaging

(1) The structure name of each part of the metal tank

① can cover. The top structure of a metal can usually refers to a metal can that is sealed after filling.

② can body. The component of a metal can. The body of a three-piece can refers to its side wall, and the body of a two-piece can consists of a bottom and a side wall.

③ can without lid. Three-piece canister without lid.

④ can opening key. Attachment for rolling the can, used to roll the can through the small tongue-shaped piece.

⑤ score. Easy-opening lid or roll-opening can body is pre-pressed or scored tear line for easy opening.

⑥ ring. It is fixed on the upper part of the can by double crimping, and there is an opening in the center to install the component of the can lid.

⑦ expansion ring. The concave-convex pull ring formed by pressing on the lid or bottom of the can to meet the needs of the expansion of the contents when the can is sterilized.

⑧ ring tab. The easy-opening lid is a ring-shaped accessory that is closed on the lid in advance for easy opening.

⑨ rivet. A blister that is pre-punched to fit the pull tab on the easy-open lid.

(2) The structure name of each part of the metal drum

① top of drum. The top member of the metal barrel, usually the top of the closed barrel may have injection holes and vent holes.

② chimb. The part above the top or bottom of the bucket is usually formed by curling.

③ fillng hole. Holes set on the top of the bucket for filling or discharging the contents.

④ air-vent. A hole set on the top of the bucket for filling and discharging the contents.

⑤ chimb reinforcement. A metal reinforcement ring installed on the convex edge of a metal barrel to protect the curling edge.

⑥ rolling hoop. The guard ring attached to the barrel body, when the barrel rolls, the rolling hoop hits the ground, so as not to damage the barrel body.

⑦ reinforce ment. The convex or concave part formed on the metal container to increase the rigidity has two types: ring ribs and non-ring ribs.

⑧ handle. An accessory mounted on a metal container, used for grasping or carrying.

⑨ bale handle. A semi-circular metal wire handle with two ends connected to the barrel body by hanging ears.

⑩ drop handle. A small ring-shaped handle which is fixed on the barrel by hanging ears and can rotate freely.

⑪ lug. A metal connecting member that is fixed on the barrel and can turn the handle like a hinge.

(3) The structure name of each part of the metal hose

① nozzle. The outlet of the hose. When the tube wall is squeezed, the contents are discharged from the nozzle.

② shoulder. The inclined part between the nozzle and the tube wall.

③ tube wall. The hose has a flexible cylindrical part.

④ tube cover. Thread closure or friction closure for nozzles.

Classification of metal packaging

There are many types of metal packaging containers, and there are roughly the following classification methods.

01. Classified by container shape

According to the cross-sectional shape of the container, the following container series can be formed according to relevant international and domestic standards (Figure 1-1): round cans, square cans, oval cans, oblate cans, trapezoidal cans, horseshoe-shaped cans, etc.

02, according to the external geometric characteristics of the container classification

According to the external geometric characteristics of the container, it can be divided into cylindrical tank, truncated cone (cone) tank, prismatic tank, and pyramid (cone) tank, etc., as shown in Figure 1-2.

03. Classified according to the structural characteristics of the container

   According to the structural characteristics of the container, it is mainly divided into three-piece cans, two-piece cans, spray cans and metal hoses. The three-piece tank is made up of three pieces of metal material processing the tank body, the bottom and the cover. Steel drums, square drums or special-shaped drums with larger volumes are actually three-piece tank containers. When the can body and the can bottom are processed into one body by stamping and forming, it is a two-piece can, and the spray can is just added with a spray device on the basis of the above two container cans. The body of aerosol cans can sometimes be formed by stamping from a piece of material, which is also called a single-piece can.

04. Classified by container material

A container made of what material is a container of what material type. For example, tinplate cans, tin buckets, black tin cans, aluminum cans, stainless steel buckets, coated tin cans, iron-plastic composite buckets, and paper-iron composite cans.

05. Classified according to the function of the container

According to the function of the container, it can be divided into two types: sealed container and unsealed container. Airtight containers are mainly used for packaging food and beverages. Airtight cans often need to be heat-sterilized, and the containers are required to have sufficient strength and rigidity. Unsealed containers are often used in the packaging of daily necessities or cosmetics. The artistic modeling and packaging design are the most important, and the sealing problem is the second.

06, according to the container opening method classification

According to the opening mode of the container, it can be divided into three categories: open, middle, and closed. The open type means that the top cover can be fully opened, the closed type is a partial seal, leaving only a small diameter outlet, while the middle mouth type has a larger outlet diameter than the small mouth type.