Plastic Barrel

December 9, 2024

wanplas

Industry Knowledge, Plastic Products

Plastic barrels are mostly made of polyethylene, polypropylene and other plastic blow molding and injection molding. They are the outer packaging of liquid and solid items in chemical, pesticide, pharmaceutical, food, hardware electronics, electromechanical and other industries.

Product introduction

Plastic barrels are mostly used for the storage and transportation of various liquids. They have good characteristics for packaging special dangerous goods. They are not fragile, rust-free, lightweight, and have excellent oil resistance and strong corrosion resistance. They are often used when needed. Dangerous goods packaging with thermal insulation, moisture-proof, pressure resistance and corrosion resistance. Plastic barrels are mostly made of polyethylene, polypropylene, polyester and other plastic blow molding, injection molding, blister molding, and rotational molding. They are mostly used to contain liquid and solid items in chemicals, pesticides, medicine, food, hardware, electronics, electromechanical and other industries.. Specifications range from 0.25L–220L

Open and closed plastic barrels and 1000L containerized plastic barrels. Can be used for item storage or transportation turnover. At present, the maximum capacity of plastic barrels produced by the rotational molding process can reach 50 tons.

Some products can be used for hot filling, and the general temperature should not exceed 60°C. After hot filling, the lid should be closed and stacked only after the contents are fully cooled and dropped to room temperature. Excellent weather resistance of 60℃ above zero to minus 40℃.

Applications

Plastic packaging barrels are mostly used for the storage and transportation of various liquids. They have good properties for special dangerous goods. They are not fragile, rust-free, lightweight, and not easily deformed. They are also oil-resistant and corrosion-resistant and have excellent properties. Used for packaging of dangerous goods that require thermal insulation, moisture resistance, pressure resistance, and corrosion resistance. It is mostly used to contain liquid and solid items in chemical raw materials, pesticides, lubricants, coatings, medicine, food, hardware and electronics, electromechanical and other industries. Specifications range from 100mL to 200L.

Food packaging: packaging of sauce, oil, vinegar, condiments, milk, lactic acid, etc.

Beverage packaging: packaging of wine, sake, fruit wine, mixed wine, juice, mineral water, etc.

Chemical packaging: packaging of fine chemicals, liquid fertilizers, pesticides, treatment agents, cleaning agents, etc.

Medical packaging: packaging of medical reagents, disinfectants, developers, setting solutions, distilled water, etc.

Production raw materials

The main raw material for the production of plastic barrels is polyethylene (PE), referred to as PE, which is a polymer organic compound formed by the addition polymerization of ethylene. Polyethylene is recognized in the world as the best material for food contact. It is non-toxic, tasteless and odorless, and complies with food packaging hygiene standards. Polyethylene film is light and transparent, has moisture-proof, anti-oxidation, acid and alkali resistance, average air tightness, and excellent heat sealability. It is known as the “Flower of Plastics” and is the most commonly used and most important plastic packaging and printing material. Material.

PVC

Polyvinyl chloride, referred to as PVC, has a molecular formula of (CH2-CH2CL)n. It is the most important type of vinyl polymer and the second largest plastic variety in the world after polyethylene. Its domestic output is the largest among plastics. then occupies the first place. In the printing industry, polyvinyl chloride color calendered film and transparent glazing film are often used to make the packaging and decoration of covers of books, folders, tickets, etc.

Shrink film

Shrinkfilm is a thermoplastic film that is stretched and oriented during the production process and shrinks when it is treated with hot air or irradiated with infrared rays during use. After heat treatment, the film is tightly wrapped on the packaged object, the shrinkage force reaches its maximum value during the cooling stage, and can be stored for a long time.

Low density polyethylene

Low-density polyethylene, or LDPE for short, is the most widely used variety in the plastic packaging and printing industry in various countries. The specific gravity is 0.92~0.93 and can float in water. It has low crystallinity (60%) and bulk polymerization occurs at a pressure of 1000 to 3000kg/C㎡, so it is also called high-pressure polyethylene. At 23°C, the density is around 0.92. It has poor calendering formability and is suitable for processing into tubular films by blow molding. Suitable for food packaging, fiber product packaging, and daily chemical product packaging. Biodegradable plastic bag logo

High density polyethylene

High density polyethylene, HDPE for short. The density is 0.941~0.965g/cubic centimeter. It is formed by low-pressure polymerization, so it is also called low-pressure polyethylene. It is milky white, indicating poor gloss. The film can be processed by blow molding and T-die extrusion. It is heat-resistant, retort-resistant, cold-resistant and freeze-resistant, has good moisture-proof, gas-proof, and insulating properties, is not easily damaged, and is twice as strong as LDPE. Very easy to speak. It has strong paper-like properties and is known as “paper-like plastic film”.

Polypropylene film

Biaxially oriented polypropylene film, also known as biaxially oriented polypropylene film, English abbreviation code BOPP, is characterized by stretch molecular orientation, mechanical strength, folding strength, air density, and moisture-proof barrier properties that are superior to ordinary plastic films. Compared with cellophane based on unit area, the unit price is lower than cellophane. Because this kind of film has excellent transparency, the color reproduction after inner printing is particularly bright and beautiful, and it is an important base material for plastic composite flexible packaging.

Barrel production process

Raw material preparation, blow molding, injection molding, demoulding and trimming, waste crushing, drying, assembly, final inspection and warehousing

Characteristics of plastic barrels

Soft plastic barrels are beautiful, light in weight, good in strength, impact-resistant, corrosion-resistant, foldable, non-toxic and odorless, and easy to transport. The product is suitable for packaging various salted and brine liquid foods, condiments, pharmaceutical and health products, alcoholic beverages and fine chemical products. Product features: It is acid-resistant, alkali-resistant, high-temperature resistant, non-toxic, sterile, odorless, and has excellent stretch resistance and impact resistance.

Folding, stacking, storage, transportation, palletizing, and canning greatly save space and materials in the entire process. Light weight, cold-resistant, corrosion-resistant, reducing pollution, super clean, and meets the requirements of medical testing.

Shipping instructions

The dangerous goods that can be shipped in plastic packaging barrels are:

Category I: d≤1.2: acetic acid (acetic acid, glacial acetic acid) acetic anhydride aniline cresol phenol hydrochloric acid (36%) crude oil diesel kerosene (kerosene for lamps) petroleum solvent hydrogen Hydrofluoric acid (≤60%)

Category II: d>1.2: Formic acid, silicate, hydrogen bromide solution, hydrogen iodide solution, chromic acid (30%), perchloric acid (≤50%), potassium hydroxide solution, sodium hydroxide solution, nitric acid (≤55%), sulfuric acid, waste sulfuric acid

Category III: d≤1.2: propionic acid, acrylic acid, methacrylic acid, ammonia solution, formaldehyde (≤35%), furfuryl alcohol, ethylene glycol monoethyl ether, hypochlorite solution (≤16%), alkylphenols (including C2-C8 homologues)

Category 4: d>1.2: Ferric trichloride phosphate alcohols (limited to Category 2 and Category 3) such as: methanol, ethanol (alcohol), propanol, butanol esters (limited to Category 2 and Category 3) such as: di-orthophosphorous acid Butyl ketones (limited to Category II and III) ethers (limited to Category II and III) aliphatic hydrocarbons (limited to Category II and III)

Non-dangerous goods Dimethyl Acetyl Succinate Ethoxyethyl Phosphate Tricresyl Phosphate Polyacrylamide Polyamide Polyvinyl Alcohol Polyethylene Glycol Glycol Ethylene Glycol (Glycol) Diethylene Glycol Triglyceride Alcohol Methyl glycol Butyl glycol Propylene glycol Glycerin Glutaraldehyde Higher aldehydes Fatty acids Polysiloxanes Ammonium sulfite solution Ammonium thiosulfate solution Sodium bisulfite solution Adhesives Antifreeze Bleach Disinfectants Dispersants Stabilizers Plasticizer (DBP DOP) Emulsifier Demulsifier Suspending agent Fire extinguisher Foam suppressor Acid attack agent Wetting agent Industrial cleaning agent Leather auxiliary Papermaking auxiliary Textile auxiliary Dyeing auxiliary Harvest protection agent Fiber protection agent Fluorescent whitening agent Concrete additive Construction additive cheese Protein additives Paste adhesive Fruit juice concentrate Fruit juice Betaine Spindle oil Lactic acid tannic acid Tanning agent Latex dispersion medium Liquid dye Water-based emulsion Paraffin emulsion fluid Brake fluid Engine oil Liquid fertilizer Cosmetic raw materials Triacontanol emulsion sodium silicate (foaming alkali, water glass) calcium dodecyl benzene sulfonate

Items that cannot be shipped in plastic packaging barrels include:

Dangerous goods requiring Class I packaging such as fuming sulfuric acid, concentrated nitric acid with a concentration of more than 55%, and fuming nitric acid. Benzene, toluene, xylene, chlorobenzene, gasoline, condensate, liquid ammonia, liquid chlorine, ethylene oxide, etc.

Detailed explanation of materials

The material used for blow molding-grade hollow plastic containers is low-pressure high-density polyethylene, also known as HDPE. High Density Polyethylene (HDPE) is a highly crystalline, non-polar thermoplastic resin. The appearance of original HDPE is milky white, and it is translucent to a certain extent in thin sections. PE has excellent resistance to most domestic and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons ( carbon tetrachloride ). The polymer is non-hygroscopic and has good water vapor resistance and can be used for packaging purposes. HDPE has good electrical properties, especially the high dielectric strength of the insulation, making it very suitable for wires and cables. Medium to high molecular weight grades are impact resistant, both at room temperature and even at temperatures as low as -40F. The unique properties of various grades of HDPE are the appropriate combination of four basic variables: density, molecular weight, molecular weight distribution and additives. Different catalysts are used to produce polymers with customized special properties. These variables are combined to produce HDPE grades for different uses; achieving the best balance of properties.

High-density polyethylene is non-toxic, tasteless and odorless white particles with a melting point of approximately 130°C and a relative density of 0.941~0.960. It has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. The dielectric properties and environmental stress cracking resistance are also good.

Melting temperature 220~260℃. For materials with larger molecules, the recommended melting temperature range is between 200 and 250°C.

Processing method

PE can be manufactured using a wide range of different processing methods. Using ethylene as the main raw material, propylene, 1-butene, and hexene as copolymers, under the action of a catalyst, the slurry polymerization or gas phase polymerization process is used, and the resulting polymer is flashed, separated, dried, granulated, etc. process to obtain a finished product with uniform particles. Including such processes as sheet extrusion, film extrusion, pipe or profile extrusion, blow molding, injection molding and rotational molding.

Extrusion : Grades used in extrusion production generally have a melt index of less than 1 and a medium to wide MWD. During processing, low MI can achieve suitable melt strength. Wider MWD grades are more suitable for extrusion because they have higher production speeds, lower die pressures and a reduced tendency to melt fracture.

PE has many extrusion applications such as wires, cables, hoses, pipes and profiles. Pipe applications range from small section yellow pipe for natural gas to 48in diameter thick wall black pipe for industrial and urban pipelines. Large diameter hollow wall pipes are growing rapidly as a replacement for storm drains and other sewer lines made of concrete.

Sheet and Thermoforming : The thermoformed liners of many large picnic coolers are made from PE, which offers toughness, light weight and durability. Other sheet and thermoformed products include fenders, tank liners, pan guards, shipping boxes and tanks. One large and rapidly growing sheet application is mulch or pond decking, which is based on MDPE for its toughness, chemical resistance and impermeability.

Blow molding: More than 1/3 of HDPE sold in the United States is used for blow molding. These range from bottles containing bleach, motor oil, detergent, milk and distilled water to large refrigerators, car fuel tanks and canisters. The properties of blow molding grades, such as melt strength, ES-CR and toughness, are similar to those used for sheet and thermoforming applications, so similar grades can be used.

Injection-blow molding is typically used to create smaller containers (less than 16oz) for packaging pharmaceuticals, shampoos and cosmetics. One advantage of this process is that the corners of the bottles are automatically trimmed, eliminating the need for post-finishing steps like ordinary blow molding. Medium to wide MWD grades are generally used, although there are certain narrow MWD grades used to improve surface finish.

Injection Molding: HDPE has countless applications, ranging from reusable thin-walled beverage cups to 5-gsl cans, consuming 1/5 of domestically produced HDPE. Injection molding grades generally have a melt index of 5 to 10, and there are tough and low-fluidity grades and high-fluidity grades with processability. Uses include thin-wall packaging for household goods and food; tough, durable food and paint cans; and high environmental stress cracking resistance applications such as small engine fuel tanks and 90-gal garbage cans.

Rotational molding: Materials using this processing method are generally crushed into powder materials, allowing them to melt and flow during thermal cycles. Rotational molding uses two types of PE: general purpose and cross-linkable. General-purpose MDPE/HDPE usually has a density range from 0.935 to 0.945g/CC, has a narrow MWD, giving the product high impact and minimal warpage, and its melt index range is generally 3-8. Higher MI grades are generally not suitable because they do not have the impact resistance and environmental stress cracking resistance desired in rotomolded products.

High-performance rotational molding applications utilize the unique properties of its chemically cross-linkable grades. These grades flow well during the first part of the molding cycle and then cross-link to develop their resistance to environmental stress cracking and toughness. Abrasion and weather resistance. Cross-linkable PE is uniquely suitable for large containers, ranging from 500-gal shipping tanks for various chemicals to 20,000-gal agricultural storage tanks.

Film: PE film processing generally uses ordinary blown film processing or cast extrusion processing. Most PE is used in films, either general-purpose low-density PE (LDPE) or linear low-density PE (LLDPE) available. HDPE film grade is generally used where superior stretchability and impermeability are required. For example, HDPE films are commonly used in merchandise bags, grocery bags, and food packaging.

Harmfulness

Polyvinyl chloride is also a commonly used plastic. It is a resin composed of polyvinyl chloride resin, plasticizers and antioxidants. It is not toxic in itself. However, the main auxiliary materials such as plasticizers and antioxidants added are toxic. The plasticizers in daily-use PVC plastics mainly use dibutyl terephthalate, dioctyl phthalate, etc. These chemicals All are toxic, and the anti-aging agent lead stearate of PVC is also toxic. When polyvinyl chloride (PVC) products containing lead salt antioxidant come into contact with ethanol, ether and other solvents, lead will precipitate. When PVC containing lead salt is used as food packaging and comes into contact with fried dough sticks, fried cakes, fried fish, cooked meat products, cakes and snacks, the lead molecules will diffuse into the grease, so PVC plastic bags cannot be used. Contain food, especially food containing oil.

In addition, PVC plastic products will slowly decompose hydrogen chloride gas at higher temperatures, such as around 50 degrees Celsius. This gas is harmful to the human body, so PVC products are not suitable as food packaging. Bakelite ( phenolic plastic ) contains free phenol and formaldehyde, which is toxic to the human body and is not suitable for food storage and food packaging. Although electric jade (urinary aldehyde plastic) is odorless and tasteless, when it is boiled in 100-degree water or used to hold vinegar-based foods, free formaldehyde will precipitate, which is harmful to the human body, so it is not suitable for use as tableware or food packaging. Renewal products of waste plastics (some may add a little new material), due to their complex composition, are difficult to ensure that they are non-toxic, so they generally cannot be used as food containers and packaging.

Barrel specifications