Maya Ellison
Plastic containers are made from polymer resin, which is mixed with a blend of additives to achieve desired properties such as toughness, flexibility, elasticity, and colour. The two primary ways to thermoform plastic are either by laying plastic on a hot surface to create a shape (contact heat) or by warming it up and pushing it into a mould (preheat). Plastic containers are used in a wide range of applications, from single-use disposable containers to multi-use durable containers, and are favoured for their convenience, low cost, and ability to keep food fresh for longer. While plastic packaging accounts for a significant portion of global plastic waste, alternative materials such as cardboard, aluminium, and cotton often have larger ecological footprints due to higher energy and water requirements during manufacturing and transportation.
| Characteristics | Values |
|---|---|
| Raw Materials | Polymer resin, additives, crude oil, natural gas, coal, carbohydrates, fats, oils, rubber, sulphur, glass, clay, pottery, latex resin |
| Types of Plastic | LDPE, HDPE, PET, OPS, PP, bioplastics |
| Plastic Containers | Cups, bottles, bags, tubes, clamshells, cosmetic containers, bulk containers, Tupperware, corrugated plastic containers, food containers |
| Plastic Container Features | Recyclable, disposable, durable, lightweight, mouldable, elastic, transparent, thick, safe, hygienic, child-resistant |
| Plastic Container Manufacturers | LA Container Inc., Hot Form, Inline Plastics |
| Manufacturing Locations | USA, Southern California |
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What You'll Learn
Plastic container manufacturing process
Plastic food containers are manufactured through extrusion or thermoforming processes. The first step is the selection of raw materials, which are then processed into plastic sheets. These sheets are heated and shaped into containers using tooling moulds and accurate temperature control to ensure consistent shape, thickness, and performance. Post-processing, such as trimming, is then carried out to remove excess material and verify seal integrity. Finally, the containers are inspected, packaged, and prepared for shipping.
Thermoforming is a popular method for manufacturing plastic food packaging due to its durability, affordability, and lightweight nature. It also allows for the creation of complex shapes and sizes that might be difficult or costly to achieve with glass or metal. During the thermoforming process, the heated plastic sheet becomes flexible and is then pushed or pulled into a specific shape using special moulds, plugs, and presses. The plastic conforms to the shape of the mould.
The production and moulding of thermoplastics, such as PET, OPS, and PP, is a complex operation. PET thermoformed plastics, for example, can be made highly transparent, providing excellent product visibility. The customisation of plastic food containers is also possible to meet specific requirements, such as food safety standards and mechanical resistance.
Plastic products are often made from polymer resins mixed with additives. These additives are important as they provide targeted optimum properties such as toughness, flexibility, elasticity, and colour. They can also make the plastic safer and more hygienic for specific applications. Synthetic plastics are derived from crude oil, natural gas, or coal, while biobased plastics come from renewable products such as carbohydrates, fats, and oils.
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Plastic container raw materials
The production of plastic containers is a complex process that involves the selection of raw materials, research and development, and manufacturing. The raw materials used in plastic production are typically derived from natural gas, crude oil, or coal. Crude oil, the principal source of carbon for modern plastic, undergoes a refining process to transform it into different petroleum products. This process involves heating the oil in a furnace and sending it to a distillation unit, where heavy crude oil separates into lighter components called fractions. One crucial compound obtained from this process is naphtha, which is essential for making large amounts of plastic.
Naphtha, a volatile mixture of liquid hydrocarbons, is obtained through the distillation of crude oil. It undergoes thermal decomposition at high temperatures of around 800°C in the presence of water vapour, resulting in the formation of light hydrocarbons. These light hydrocarbons, such as ethylene and propylene, are crucial raw materials for oil-based plastics. The process of converting naphtha into plastic involves steam cracking or catalytic cracking. Steam cracking uses high temperatures and pressure to break down hydrocarbons, while catalytic cracking employs a catalyst to enable the process at lower temperatures and pressures.
The raw materials for plastic containers are often in the form of polymer resins, which are mixed with additives to achieve specific properties. These additives play a vital role in enhancing the toughness, flexibility, elasticity, and colour of the plastic. Additionally, they contribute to making the containers safer and more hygienic for their intended applications. One commonly used plastic packaging raw material is polyethylene (PE), known for its durability and resistance to chemicals. Polyethylene is produced through the polymerisation of ethylene monomers, resulting in a thick, viscous substance that can be moulded into plastic products.
Polypropylene (PP) is another widely used raw material in plastic container production due to its lightness, durability, and chemical resistance. It belongs to the group of polyolefins and is obtained through the polymerisation of propene. Additionally, polyamide, commonly known as nylon, is a versatile raw material used in the plastics industry. It was first discovered by DuPont in 1935 and offers a range of properties that make it suitable for various applications. Furthermore, polystyrene, produced through the polymerisation of styrene monomers, is a lightweight, hard, and temperature-resistant plastic raw material commonly used in the industry.
In recent years, there has been a growing trend towards the use of biobased plastics or bioplastics, which are derived from renewable sources such as carbohydrates, fats, and oils, rather than solely relying on oil-based plastics. This shift aims to reduce the environmental impact of plastic production and promote sustainability. Some plastic containers, such as PET containers, are made with recycled materials, combining 90% recycled content on the inside and 10% virgin plastic on the outside. These choices in raw materials and manufacturing processes reflect a conscious effort to minimise waste and promote the reuse of materials.
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Plastic container thermoforming
Plastic containers are manufactured through various processes, including thermoforming, which is a popular method for producing plastic packaging. Thermoforming involves using heat, vacuum, and pressure to shape plastic sheets into three-dimensional objects. This process is versatile and cost-effective, making it a popular choice for creating plastic containers with custom designs.
Thermoforming begins with selecting the appropriate plastic material, such as PVC, PETG, HIPS, HDPE, or ABS. These materials are often derived from crude oil, natural gas, or coal, but can also be made from renewable sources, resulting in biobased plastics. The chosen material is then heated to a pliable temperature, making it ready for moulding.
The heated plastic sheet is then forced onto a mould, typically made of aluminium, using mechanical pressure or a vacuum. This process allows the plastic to take on the desired shape. After cooling and hardening, the moulded part is trimmed to create the final product. Thermoforming also produces parts with enhanced stress crack resistance, high impact strength, and good rigidity.
One advantage of thermoforming is its sustainability. Excess plastic can be recycled and reused for further production, reducing waste. Additionally, companies like Lacerta offer recyclable materials like PET, PP, or PCR content for their thermoformed packaging. This commitment to sustainability is also evident in Hot Form's practice of using recycled material for the production of new food packaging.
Thermoforming is a versatile process that can accommodate custom designs and sizes with low tooling costs. Companies like EasyPak and Flexcon offer thermoformed packaging solutions, ensuring product protection and display while adhering to food safety standards and environmental consciousness. The ability to customise packaging helps products stand out on shelves and meet unique demands, such as leak resistance or extended shelf life for food items.
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Plastic container customization
Plastic containers are made from synthetic plastics derived from crude oil, natural gas, or coal. They can also be made from bioplastics derived from renewable sources such as carbohydrates, fats, and oils. The production process involves selecting raw materials, research and development, and manufacturing.
Custom containers can also be designed to be stackable, with specific shapes that allow for optimal positioning when stacked, saving space. They can also include functional add-ons such as handles or spouts, and features such as tamper-evident seals. The cost of custom containers depends on the type of material used, the size, and the quantity produced.
Custom containers can be an asset to a company's branding and marketing strategy. They can be designed with a company's logo and colours, advertising the brand while goods are in transit. Custom containers can also be designed to meet specific industry regulations, such as FDA-approved containers for the food sector, with features such as hermetic closures and UV protection to enhance shelf life and guard against spoilage.
Overall, plastic container customization offers a cost-effective solution for businesses, providing a way to safely and securely transport goods while also maximizing storage capacity and capabilities.
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Plastic containers and the environment
Plastic containers are made from synthetic plastics derived from crude oil, natural gas, or coal. The production of plastic is energy-intensive and emits greenhouse gases, contributing to global warming and climate change. The extraction, transportation, and refinement of these fossil fuels release millions of metric tons of greenhouse gases into the atmosphere annually.
The impact of plastic on the environment is significant and widespread. Plastic pollution affects every part of the planet, from Mount Everest to the Marianas Trench. It takes over 1,000 years for plastic to decompose, and the plastic waste that ends up in landfills and the environment releases toxic pollutants and irritants, posing risks to human health and threatening wildlife and ecosystems. Single-use plastics, such as water bottles, grocery bags, and product packaging, are a prime culprit, accounting for half of the 300 million tons of plastic produced annually worldwide.
To mitigate the environmental impact of plastic containers, reducing single-use plastic consumption and increasing the use of biodegradable materials are essential. Consumers can make a difference by adopting reusable alternatives, such as water bottles, bags, and containers, and avoiding overly packaged items. Companies are also responsible for reducing plastic packaging and transitioning to sustainable materials. Improving the life cycle of plastic products and complying with environmental regulations can enhance their reputation among stakeholders and customers.
Additionally, recycling plastic waste is crucial for reducing environmental damage. Recycling one pound of polyethylene can significantly decrease carbon dioxide emissions. However, due to poor waste management, much of the plastic packaging sent to landfills ends up in natural environments, with 8 million tons of plastic dumped in the ocean each year. The incineration of plastic waste in landfills further exacerbates the problem, releasing toxic fumes that pose health hazards to nearby residents.
The presence of microplastics in plastic containers and the food supply chain has also become a growing concern. Research has linked human exposure to certain chemicals in plastics, such as endocrine disruptors, to hormonal imbalances, reproductive issues, and cancer. Efforts to restrict the use of microplastics in products and advocate for sustainable alternatives are gaining momentum, with California proposing a ban on plastic microbeads in cosmetics and cleaning products.
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Frequently asked questions
Plastic containers are made from polymer resin, which is mixed with a blend of additives. Synthetic plastics are derived from crude oil, natural gas, or coal. Biobased plastics are made from renewable products such as carbohydrates, fats, and oils.
Plastic containers are made all over the world. Some companies, like LA Container Inc., are based in the USA and take pride in manufacturing their plastic products in America.
Plastic containers can be single-use or reusable. They can be cups, bottles, bags, food containers, cosmetic containers, or intermediate bulk containers.
There are two primary ways to thermoform plastic: using contact heat or preheat. With contact heat, plastic is laid on a hot surface to create the shape. With preheat, the plastic is warmed up first and then pushed into the mold.
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