Sofia Martinez
Plastic containers are commonly manufactured through extrusion or thermoforming processes, where plastic sheets are heated and moulded into containers. There are two primary ways to thermoform plastic: using contact heat or preheat. Contact heat involves laying plastic on a hot surface to create the desired shape, while preheat involves warming the plastic and then pushing it into a mould. Plastic containers are widely used due to their durability, chemical and weather resistance, and cost-effectiveness. They are made from various materials, including synthetic plastics derived from crude oil, natural gas or coal, and biobased plastics made from renewable sources. The manufacturing process involves adding specific additives to enhance properties such as toughness, flexibility, and colour.
| Characteristics | Values |
|---|---|
| Plastic container manufacturing process | Extrusion or thermoforming |
| Thermoforming methods | Contact heat, preheat |
| Advantages | Chemical-resistant, weather-resistant, long-lasting, cost-effective, elegant, protective, recyclable |
| Disadvantages | Environmental impact, not always recycled by end-users |
| Additives | UV protection, anti-oxidation, antimicrobial properties, colour, toughness, flexibility, elasticity |
| Plastic types | PET, HDPE, polypropylene, LDPE, biobased plastic, bioplastics |
| Plastic sources | Crude oil, natural gas, coal, renewable products (carbohydrates, fats, oils) |
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What You'll Learn
Plastic container manufacturing processes
Plastic containers are made from polymer resin, which is mixed with a blend of additives to give the plastic its desired properties, such as toughness, flexibility, elasticity, and colour. The two primary ways to thermoform this plastic into containers are through contact heat or preheat. With contact heat, the plastic is laid on a hot surface and shaped, whereas with preheat, the plastic is warmed up first and then pushed into the mould. Contact heat is better suited for simpler designs and is more cost-effective than preheat. After the plastic has been heated and shaped, it is cooled, punched out, and fold lines are scored. The excess plastic left over, known as the "web", is ground down, melted, and used to make other plastic products.
After the containers have been formed, they undergo post-processing, including trimming and quality checks to ensure seal integrity. The containers are then inspected, packaged, and prepared for shipping. Most plastic packaging is recyclable, and the recycling process involves sorting, cleaning, grinding, melting, and remanufacturing the plastic into new products. Thermoplastics, in particular, can be recycled multiple times.
Another method for creating plastic containers is rotational molding, where the plastic melt is distributed across the interior surfaces of a mold through rotational movement. This process does not require high pressure, so the molds are relatively inexpensive, and larger items can be produced. Additionally, this method can create double-walled containers in a single step. Products made using rotational molding include industrial and agricultural storage tanks, drums, carboys, insulated boxes, and trash bins.
Compression molding is a technique used to create containers with fibre reinforcements, where glass or carbon fibres are incorporated into the plastic before it is molded. This process is similar to injection molding and is limited to making containers that are open on one side. Examples of products made through compression molding include large bins, tubs, trays, and plastic caps for bottles. Plastic containers are used for a wide range of purposes, including gas canisters, shipping containers, luggage, storage bins, barrels, drums, and tool chests.
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How plastic is made
Plastic is made from natural materials such as cellulose, coal, natural gas, salt, and most commonly, crude oil. The process of making plastic involves distillation, polymerisation or polycondensation, and the addition of various additives.
Firstly, the chosen natural material is heated in a furnace and sent to a distillation unit, where heavy crude oil separates into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. Polymerisation is a process in the petroleum industry where light olefin gases (such as ethylene, propylene, and butylene) are converted into higher molecular weight hydrocarbons (polymers). This occurs when monomers chemically bond to form chains, creating polymers or resins such as Polyethylene Terephthalate (PET) and High-Density Polyethylene (HDPE).
These resins are then melted and cooled to form nurdles, or small plastic pellets. The nurdles are shipped to manufacturing facilities, where they are melted and mixed with other ingredients to create a specific type of plastic. This mixture is then formed into various products by plastic-forming machinery.
The process of creating plastic containers can involve extrusion or thermoforming, where plastic sheets are heated and shaped into containers using tooling molds. Compression molding is also used to create containers with fiber reinforcements, such as glass or carbon fibers. Rotational molding is another method where plastic melt is distributed across the interior surfaces of a mold through rotational movement, creating products like storage tanks and drums.
After the containers are formed, post-processing, such as trimming and quality checks, ensures the removal of excess material and verifies seal integrity. Finally, the containers are inspected, packaged, and prepared for shipping to meet food safety and delivery standards.
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Plastic container advantages
Plastic containers are made through a series of complex chemical processes that convert raw petroleum into thermoplastics. These thermoplastics are then moulded, shaped, and formed into robust, durable, and long-lasting containers.
Plastic containers offer a multitude of advantages, including:
Durability and Longevity
Plastic containers are highly resistant to moisture, UV radiation, and a wide range of chemicals. This makes them ideal for storing food, pharmaceuticals, industrial chemicals, and household cleaning products. With customised additives, they can be further enhanced with UV protection, anti-oxidation, and antimicrobial properties. Their durability ensures excellent lifecycle performance, making them reliable for long-term storage.
Lightweight and Portable
Plastic containers are significantly lighter than metal or glass alternatives. This weight advantage reduces transportation and shipping costs, eases storage, and increases logistical efficiency. They are easy to carry, load, and unload, making them convenient for travel, picnics, or transporting meals to work or school.
Affordability and Wide Availability
Compared to glass or metal, plastic containers are generally more affordable and accessible, offering an economical and practical option for most households. They are versatile and cater to various storage needs with their range of sizes and shapes. Some are designed to be stackable, saving valuable space in refrigerators or pantries.
Safety and Convenience
Plastic containers are resistant to breaking, making them safer for homes with children or pets. They can withstand drops and bumps without shattering, reducing the risk of injuries. Many plastic containers are also microwave-safe, allowing for easy reheating of food without the need for additional dishes. Certain containers are designed for freezing temperatures, making them suitable for long-term freezer storage.
Pest Protection
Plastic containers provide effective protection against pests such as insects and rodents. This feature is essential for maintaining the integrity of stored food, fabrics, and other household items.
While plastic containers offer these advantages, it is important to note that there are more eco-friendly alternatives, such as glass, stainless steel, or silicone, for those seeking to reduce their environmental impact. Proper understanding and usage of different plastic grades, along with correct cleaning and maintenance practices, are crucial for maximising the lifespan of plastic containers and minimising potential health risks.
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Plastic recycling
Once the appropriate plastics are identified, the next step is to ensure they are empty, clean, and dry. Any food residue or debris should be scraped or rinsed off, as items with food waste cannot be recycled. After cleaning, it is recommended to put the caps back on plastic bottles, and they can be placed in the recycling bin.
The collected plastics are then picked up by haulers and taken to a Material Recovery Facility (MRF). At the MRF, the materials undergo a sorting process to separate different types of plastics and other contaminants like glass or metal. This sorting can be done based on size, shape, and material type, using techniques such as magnetic separation for steel and conductive properties for aluminium.
After sorting, the plastics are further processed. This involves grinding or shredding the plastic into smaller pieces or flakes, followed by melting them down. The melted plastic can then be moulded into new products through processes like rotational molding or compression molding. Rotational molding is ideal for creating larger items with double walls, while compression molding is used for containers open on one side, such as trays and tubs.
The newly formed plastic products are then inspected, packaged, and prepared for shipping. This completes the recycling journey, where the once-used plastic containers are now ready for a new life as something else.
Additionally, it is worth noting that some plastic items, like plastic bags, should be returned to specific drop-off locations instead of being placed in curbside recycling bins. These plastic bags can be recycled into decking materials, showcasing the transformation of waste into valuable new products.
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Types of plastic containers
Plastic containers are used for a variety of purposes, including storing food, liquids, and everyday products. They are valued for their resistance to chemicals, weather, and mechanical wear, making them durable and reliable. The process of thermoforming plastic can be done in two ways: by laying plastic on a hot surface and creating the shape with contact heat, or by warming the plastic first and then pushing it into a mold (preheat). The former is less expensive, while the latter allows for more complex designs.
There are several types of plastic containers, each with its own unique characteristics and uses. Here are some examples:
- PET ( Polyethylene Terephthalate): PET containers are practical and safe for storing cold food and beverages. They are designed to effectively keep and preserve food at cool temperatures, making them ideal for fresh salads, frozen desserts, and fruits. PET bottles must undergo a heat-set process to endure higher temperatures without collapsing.
- HDPE ( High-Density Polyethylene): HDPE is commonly used for disposable beverage and food containers, as well as household cleaning product containers. It is also used for milk jugs, detergent and juice bottles, butter tubs, and toiletries containers.
- PP ( Polypropylene): PP containers have excellent chemical and impact resistance. They are versatile and robust, making them suitable for food transport and maintaining the freshness of dry products due to their low moisture absorption. PP bottles can also be used for hot-fill applications.
- PS ( Polystyrene): PS plastic bottles are clear, inflexible, and have low impact and fair chemical resistance. They are commonly used for mass-produced disposable containers, laboratory bottles, and cutlery. Polystyrene is typically not accepted by recycling plants due to the chemicals used in its manufacturing.
- PVC ( Polyvinyl Chloride): PVC bottles are often clear with a streaky finish and have good chemical resistance. They are durable and suitable for hot-fill applications, commonly used for shampoo, oils, and household chemicals.
- LDPE ( Low-Density Polyethylene): LDPE bottles are known for their squeezable and malleable feel, making them ideal for droppers and dispensing applications such as honey and shampoo. LDPE containers are tough and have good chemical resistance.
- OPS ( Oriented Polystyrene): OPS containers are designed to keep food fresh and attractive, simplifying presentation and consumption. They are versatile and adaptable to various foods and situations, making them a practical choice for kitchen use.
- Plastic Folding Boxes: These containers offer a clear view of the product while protecting it from damage during shipping. They are lightweight yet durable, with some versions featuring rigid sides that can collapse flat when not in use. They are highly customizable and can be used for product display, shipping, and storage.
These are just a few examples of the many types of plastic containers available, each designed for specific purposes and offering unique features and benefits.
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Frequently asked questions
Plastic containers are made from polymer resin and mixed with a blend of additives to provide the plastic with optimum properties such as toughness, flexibility, elasticity, and colour. Synthetic plastics are derived from crude oil, natural gas or coal.
Plastic containers can be made using rotational molding, compression molding, or injection molding. Examples of products made through compression molding include large bins, tubs, trays, and plastic caps for bottles. Products made using rotational molding include industrial and agricultural storage tanks, drums, carboys, insulated boxes, and trash bins.
There are two primary ways to thermoform plastic: laying plastic on a hot surface to create the shape (contact heat), or warming it up first and then pushing it into a mold (preheat). Excess plastic is left over once the products have been punched out, which is then ground down, melted, and made into other plastic products.
