Sofia Martinez
Plastic packaging is a highly efficient way of packaging goods. It is strong, durable, lightweight, and cheap to produce. There are many different types of plastic packaging, each with unique properties. Some of the most common types of plastic used for hard packaging include PET/PETE, PVC, HDPE, LDPE, PP, and PS. These plastics vary in terms of their density, flexibility, transparency, heat resistance, and other factors. Each type of plastic is suited to different applications, such as food and drink packaging, medical equipment, or construction.
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What You'll Learn
Polyethylene terephthalate (PET)
The annual production of PET was 56 million tons in 2016, with the biggest application being in fibres (over 60%), and bottle production accounting for about 30% of global demand. In the context of textile applications, PET is referred to as polyester, while the acronym PET is used in relation to packaging. PET used for packaging makes up about 6% of world polymer production by mass.
PET is very compact and can be semi-rigid or rigid. It is a strong gas and moisture blocker and a great deterrent to liquids and solvents. It is also suitable for fabricating thin-layer products like stretched film and thermoforming. PET is widely used to make carbonated beverage bottles because it has high strength and toughness, good abrasion and heat resistance, low creep at elevated temperatures, good chemical resistance, and excellent dimensional stability.
Another interesting application of PET is to make artificial fibres for textiles (commonly found in clothes tags, written as Polyester). Fibres made from PET have outstanding wear resistance, low moisture absorption, and are very durable. Textile applications include blankets, bed sheets, comforters, carpets, cushioning in pillows, upholstery padding, and upholstered furniture.
In 3D printing, PETG (polyethylene terephthalate glycol) has become a popular material used for high-end applications in various sectors, including surgical, automotive, and aeronautical. The surface properties of PET can be modified to make it self-cleaning, such as in the fabrication of traffic signs or LED spotlights.
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High-density polyethylene (HDPE)
The density of HDPE ranges from 0.93 to 0.97 g/cm3, which is only marginally higher than low-density polyethylene (LDPE). However, its linear structure means it has little branching, resulting in stronger intermolecular forces and tensile strength compared to LDPE. This gives HDPE a higher specific strength, allowing a 60-gram container to hold over a gallon of liquid or about eight pounds of weight.
HDPE is commonly used in packaging and has a wide range of applications. It is often used to make sturdy bottles that resist oils, such as milk jugs, shampoo bottles, and bleach bottles. It is also used for grocery bags, agricultural pipes, playground equipment, lids, and recycling bins. In addition, HDPE is used in industrial applications like cell liners in sanitary landfills and pyrotechnics mortars, as well as in the production of plastic lumber, geomembranes, and corrosion-resistant piping.
HDPE is considered a safe plastic for various purposes and is easily recyclable. It has the number "2" as its resin identification code. Recycled HDPE can be used to create new products such as pens, rubbish bins, outdoor furniture, fencing, detergent bottles, and plant pots. The process of recycling HDPE can be complex due to its high energy requirements, but it helps reduce plastic production and keeps non-biodegradable waste out of landfills.
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Polyvinyl chloride (PVC)
PVC is widely used due to its ability to resist oil and chemicals. It has stable physical properties, which make it strong with fantastic clarity. It is also 100% recyclable. Recycled PVC can be used to produce packaging, film and sheet, loose-leaf binders, pipes, carpet backing, electrical boxes, cables, and more. PVC resin is produced from vinyl chloride monomers. The process begins with the production of vinyl chloride monomer (VCM) by reacting ethylene with chlorine using a catalyst. Polymerization can be initiated through heat, chemical initiators, or UV light. To enhance specific properties, additives like plasticizers, stabilizers, lubricants, fillers, pigments, and flame retardants are often incorporated into the PVC formulation.
PVC is ideal for applications that require long-lasting performance, such as pipes and window frames. It also provides excellent cable insulation, making it perfect for applications involving electronics. PVC is also useful in the construction industry for applications such as window frames, profiles, and other structural components.
PVC has its limitations, however. It is regarded as not biodegradable and is the least environmentally friendly type of plastic. PVC is also highly flammable, making it unsafe for use in specific industries. There are also concerns that the by-products of manufacturing PVC are toxic to humans.
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Polypropylene (PP)
PP is a lightweight material, which makes it easier to transport and advantageous in industries where weight reduction is desired, such as automotive and packaging. It is also capable of floating on water, given it has a density of less than 1 g/ml. PP has a slippery, tactile surface, and good mechanical strength, allowing it to withstand bending, flexing, and vibration without undergoing significant deformation. It offers excellent fatigue resistance and elasticity, securing it a well-deserved reputation for toughness and durability. PP has high insulation properties too, making it safe to use for plastic casing in electrical goods and cables.
PP is widely used in packaging applications due to its excellent moisture resistance, durability, and cost-effectiveness. Its wide colour range, durability, low cost, and resistance to dirt make it ideal as a protective cover for papers and other materials. It is used in the production of stationery folders, packaging, and storage boxes. The availability of sheet polypropylene has provided an opportunity for the use of the material by designers. The light-weight, durable, and colourful plastic makes an ideal medium for the creation of light shades, and a number of designs have been developed using interlocking sections to create elaborate designs.
PP is also used in the production of various medical and healthcare products due to its biocompatibility (grade-specific), sterilizability, and chemical resistance. Examples include syringes, IV components, medical packaging, laboratory equipment, and disposable medical devices. PP is also used for manufacturing pipes and fittings, tanks, chemical containers, industrial filters, battery cases, and corrosion-resistant components.
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Polystyrene (PS)
PS can be produced in solid or foamed forms, with the latter being more common in food packaging. The foamed version of PS, known as expanded polystyrene (EPS) or Styrofoam, is a rigid and closed-cell foam that provides excellent insulation and protection for various food products. EPS is usually white and made from pre-expanded polystyrene beads, which are formed into small polystyrene beads during the manufacturing process.
While PS is versatile and applicable in various industries, it has come under scrutiny by environmental organisations due to its poor recyclability. It is not accepted in most curbside collection recycling programs and has been banned for food packaging in several jurisdictions, including the European Union, Zimbabwe, Vancouver, and various localities in the United States. The search for alternatives to PS, especially in restaurant settings, has been a priority for solid waste environmental organisations.
Despite the controversy surrounding its recyclability, PS remains a significant material in everyday life and industry due to its low cost and versatility. It is often used in protective packaging, such as packing peanuts and optical disc jewel cases, as well as containers, lids, bottles, trays, tumblers, and disposable cutlery. PS is also used in the manufacture of household products and advertising elements due to its ease of processing.
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Frequently asked questions
Examples of hard plastic packaging include High-Density Polyethylene (HDPE), Polypropylene (PP), Polystyrene (PS), Polycarbonate (PC), and Polyethylene Terephthalate (PET).
Hard plastic packaging is strong, durable, lightweight, and impact-resistant. It can also be rigid or flexible, with varying levels of transparency and heat resistance. Some types of hard plastic are known for their chemical resistance and stability, making them suitable for a wide range of applications.
Hard plastic packaging is commonly used for bottles, containers, and packaging materials. It is often used in the food industry for items such as bottles, containers, cups, trays, and lids. Hard plastic is also used in construction, electronics, automotive parts, and medical equipment.
Hard plastic packaging has varying levels of recyclability. Some types, like PET, are widely recycled, while others, like polystyrene, have a reputation for being difficult to recycle. There are also environmental concerns associated with certain types of hard plastic, such as PVC, due to the toxicity of their manufacturing by-products and their lack of biodegradability.
