Properties and Application of Traditional Steel Barrel

A traditional form of packaging , steel drums of the production process and its application standards have been more mature . It is widely used petroleum products, food and light industry , chemical products, packaging containers. The newly developed plastic barrels and drums are basically the same applications . Only the former is more suitable for petroleum products transportation purposes , the latter demand is relatively small in terms of volume of food and light industry, chemical products, packaging advantages.
l Material Requirements
The main raw materials are steel drums , generally require steel to surface roughness , stiffness lower carbon content is small and uniform thickness . Auxiliary materials required for manufacturing steel drums including oil sealants , gaskets, mouth piece bucket and paint. Crimping sealant requires good elasticity, adhesion force, curing ingredients and more, good chemical resistance and process performance.
Raw materials for the manufacture of plastic buckets are polyethylene, polyvinyl chloride and modified polypropylene. Selection is mainly from the molding process and performance requirements two aspects to consider . For example , plastic vats long process due to the material , in addition to a higher injection pressure, typically using a melt index of larger plastic grades. The blow vats materials should consider their density values ​​preclude the use of a rigid , resistance to creep , wear resistance and resistance to environmental stress cracking characteristics of high molecular weight HDPE.
Compared with steel , plastic material has the advantage of light weight , waterproof, moisture-proof , but its barrier properties , heat resistance, impact resistance are far inferior to steel .
l production process
Forming
Steel drum manufacturing process involves a wide range of technical fields . Usually requires the following steps : uncoiling leveling sheet metal , welding edge processing , barrel body welding, flanging barrel body , barrel body up type , roll package with the barrel bottom forming and pre-roll , surface treatment , the inner and outer surface coatingsurface paint .
Relative to the steel drums , plastic barrels barrel molding process easier. It can be used injection molding or blow molding process. Like ordinary plastic products , only through the plastics , injection mold filling , solidification and cooling mold to complete the barrel of an injection molding. Lid is injection molding manufacturing, a general of the points covered and sealed lid , airtight lid design should take full account of the use of plastic elastic . There is also a convenient insert molding - blow molding method , you can handle one-off ring and barrel shape . It need not preclude the use of L-ring injection molding method , the obtained monolithic vat having a high tightness , the handle and the bond between the barrel and high performance.
Since drums forming process is relatively complex, the cost of production is much higher than the plastic bucket . In addition, the steel drum leakage problems more likely. In addition to possible leakage barrel mouth , the bottom of the barrel barrel barrel body weld and seal the top of the volume handled properly, can cause similar problems .Statistical data show that the proportion of steel drums and the site of leakage is roughly: the weld bead and triangular area accounted for 85% ; bung lid at 10% ; barrel body welds 5 percent. And because it is a molded plastic barrel , the barrel does not exist seams , greatly reducing the leakage opportunities.
Surface treatment
As a commodity packaging, handling bucket appearance is very important. From the publicity point of view, even better performance plastic bucket .
Before printing , steel drums to be the underlying coating . Often use white paint or colorless transparent coating on the surface of coated steel drums , as a full version of the printed graphic background use . As for the plastic bucket , except some colorless transparent plastic bucket , most due to the injection molding in plastic masterbatch pigment added , one by molding it with color. Do specific commodities such as publicity , as long as can be directly printed on the surface of the barrel .
Since barrel has a certain volume directly on the barrel surface printing, screen printing can only preclude the use . Because different materials, printing inks used for both the barrel is also somewhat different . Drums mainly used two liquid reaction type ink, plastic bucket is more evaporation drying type ink is used . Printing drums relatively poor performance , the surface of the coating, or not cleaned of grease, dust will affect the attachment force of ink for steel drums , text and graphics may appear jagged , there are glitches and dropouts . The smooth texture of the plastic material , easy to remove surface attached ? Dust, very easy printing . Plastic bucket finished a neat appearance , imprinted smooth edges , textured clear and uniform, both sales and display functions.
Application Market
Barrels and drums with full opening closed in two forms , 200L steel drums is their mainstream products , there are also small 4L convenient barrel. The plastic bucket capacity from 5L to 200L range , or even as large as 10,000 liters . Plastic buckets and drums have common applications, but also have their own areas of strength .
Petroleum products
At present, although the number of pipelines and tanks gradually increased, but the drums of petroleum products are still the main form of packaging and the closed mostly 200L steel drums .
Steel drums can not be filled with oil , only to 80-90% of capacity . And poured out the injection process, the barrel gas space will correspondingly decrease or increase , special breathing valve is to maintain the pressure balance inside and outside the barrel set to play the drums to prevent leakage due to bursting of the role . Transport in harsh environments, drums better performance than plastic bucket . For example , the high temperature performance , unlike plastic bucket as easily deformed even at high temperatures to melt . It is estimated that , 200L steel drums demand for more than 10 million .
200L plastic barrel in 1988, appeared in China , at the beginning the business for its ability as a petroleum product packaging has been questioned. Later, because the plastic bucket in this regard also has certain advantages, such as can withstand greater mechanical stress , cleaning costs low and reusable , with its market demand is increasing. Current annual demand 200L plastic barrels may one million or more. In addition , in recent years a popular composite intermediate bulk containers (IBC), commonly known as tons of packaging plastic container barrels , the specifications are 820L, 1000L and 1250L, generally with a steel frame and tray. Capacity is the most important feature , which is the drums can not be achieved .
Furthermore , in the application are subject to some restrictions plastic bucket , if not for holding gasoline , trichlorethylene , benzene , toluene and dilute material . They belong to inflammable and explosive dangerous goods, and non-conductive plastic bucket is easy to cause the phase accumulation of static electricity shock , causing explosion.
Light industry, chemical products, food
China light industry, chemical industry developed into steel drums provides a vast market where the demand for small and medium steel drums are the main target , with an estimated market volume more than 10 million . Small drums generally preclude the use of tin as a raw material for containing paints, coatings, lubricants, etc. ; while medium-sized drums used to hold paint , calcium carbide, yellow phosphorus and so on. Especially 4L rectangular buckets and convenient kegs popular .
Plastic bucket in this area market share expanding. Its biggest potential market is the paint industry .
Food industry, the demand for steel drums are further expanded. It is estimated that this part of the market demand for more than 500,000 annually .
For food packaging drums are mostly open barrel to 200L or larger capacity main object is now the largest consumer of tomato sauce, applesauce and honey and other products.
All kinds of seasonings, baking oil , fruit juice , beans, etc. will be used as the outer plastic bucket .
But not the best long-term plastic barrels loaded edible oil. Used to hold wine or with aromatic items , and time is not too long .