Omar Khalid
Polylactic acid (PLA) is a popular bioplastic commonly used in FDM 3D printing. It is made from renewable organic resources such as corn starch or sugarcane and is known for its biodegradability. The density of PLA is about 1.24 grams per cubic centimeter, and it plays a critical role in 3D printing for accurate weight estimation, material use optimization, and achieving desired product characteristics. Its density also impacts the adhesion between layers, with higher density resulting in stronger adhesion and lower density potentially leading to delamination.
| Characteristics | Values |
|---|---|
| Density | 1.25 g/cm³ |
| Glass Transition Temperature | 55-60°C |
| Heat Deflection Temperature | 53-65°C at 0.45 MPa |
| Tensile Strength | 48-70 MPa |
| Flexural Strength | 97-124 MPa |
| Izod Impact Strength | 0.36-0.58 J/cm |
| Melting Point | 150-180°C |
| Water Absorption | 0.1-0.2% |
| Typical Processing Temperature | 180-230°C |
| Shrinkage | 0.3-0.8% |
| Flame Retardancy | V-2 to V-0 |
| Typical Applications | 3D Printing Filament, Biodegradable Packaging, Medical Devices, Food Service Ware |
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What You'll Learn
PLA is a popular bioplastic used in 3D printing
Polylactic Acid, commonly known as PLA, is one of the most popular bioplastics used in 3D printing. It is a thermoplastic polymer derived from natural sources such as corn starch, sugar cane, corn, and sugarcane. Unlike many other 3D printing materials, PLA is considered more sustainable as it does not come from finite resources like petroleum but is instead sourced from renewable resources. This makes it one of the most environmentally friendly filaments on the market today.
PLA is the default filament of choice for most extrusion-based 3D printers because it can be printed at a low temperature of around 180°C and does not require a heated bed. It is also one of the most inexpensive filaments available. The material easily adheres to a variety of surfaces and, unlike other plastics, does not emit smelly fumes when printed. PLA is also easily pigmented and comes in a diverse range of colours and blends. It can be combined with different fills like metal, wood, and fibre to give it different characteristics.
However, PLA has some disadvantages. Its printed parts are quite fragile and not very strong, making it more suitable for non-functional prototyping, decorative applications, and low-stress uses. It is also sensitive to sunlight and high temperatures, which can cause the plastic to deform rapidly. Therefore, it is primarily used by beginners for creating decorative elements, gadgets, and toys.
PLA is used in a wide range of industries, including automotive and food packaging, for the creation of 3D printed products. In the automotive industry, for example, PLA can be used for creating car accessories or elements of the dashboard. It is also used in engineering plastics, where it is blended with a rubber-like polymer to create blends with good form stability and visual transparency, making them useful in low-end packaging applications.
Overall, PLA is a popular bioplastic for 3D printing due to its ease of use, low cost, and environmental benefits. However, its limitations in terms of strength and temperature sensitivity make it more suitable for certain applications than others.
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It is made from renewable organic resources
Polylactic acid (PLA) is a thermoplastic polyester derived from renewable biomass sources, typically fermented plant starch from crops like corn, sugarcane, or sugar beets. The starch is converted into dextrose, and then through a process of fermentation and chemical synthesis, it is transformed into PLA. This makes PLA a more sustainable and environmentally friendly alternative to many traditional petroleum-based plastics.
The renewable nature of PLA's source materials is a key advantage. Unlike petroleum-based plastics, which are derived from finite fossil fuel resources, PLA can be produced from renewable resources that can be replenished. This reduces our reliance on non-renewable resources and can help to mitigate the environmental impact of plastic production.
The organic nature of PLA's source materials also sets it apart from many other plastics. The use of plant-based resources ensures that PLA is biodegradable under certain conditions. In an industrial composting facility, for instance, PLA can be completely broken down into water and carbon dioxide within a matter of months. This compost can then be used to enrich the soil, providing a more sustainable end-of-life option for plastic products.
It is important to note that the biodegradability of PLA depends on the specific conditions it is exposed to. While it can degrade in industrial composting facilities, it may not break down as efficiently in a home compost system due to the lower temperatures and different microbial environments. In the absence of oxygen, as in a landfill, PLA will degrade much more slowly, though it will still ultimately biodegrade.
The renewable and biodegradable nature of PLA makes it an attractive option for a wide range of applications, from packaging to 3D printing filaments. It offers a more sustainable alternative to traditional plastics without compromising on performance or versatility. However, it is important that consumers properly dispose of PLA products to ensure they can fully biodegrade and contribute to a more circular economy.
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PLA is biodegradable and recyclable
Polylactic acid (PLA) is a type of plastic that is often touted as a renewable, biodegradable, plant-based alternative to petroleum-based plastics. It is made from renewable and natural raw materials such as corn and sugarcane. The process involves extracting starch (glucose) from the plants, converting it into dextrose with enzymes, and then fermenting it with microorganisms to produce lactic acid. This is then converted into polylactide, which is polymerised to create long-linked molecular chains that resemble petroleum-based polymers.
PLA is indeed biodegradable, but it requires specific conditions to break down effectively. It needs to be composted in an industrial facility with high temperatures of around 60-80°C and a good moisture level to facilitate biodegradation. In these conditions, PLA can be effectively digested by microbes, breaking it down into lactic acid, which is benign. However, it is important to note that PLA does not biodegrade in the ocean or in landfills, where it can persist for extended periods.
While PLA is technically biodegradable, it is not currently widely recycled. This is not because it cannot be recycled but due to a lack of infrastructure and specialised facilities. PLA needs to be sorted separately from regular plastic and brought to closed composting environments. If it ends up in regular recycling streams, it can contaminate the entire batch. Unfortunately, many cities lack the necessary industrial composting facilities, resulting in PLA often being discarded into landfills or the ocean, where it can have negative environmental consequences.
The recyclability of PLA is further complicated by the presence of additives in some formulations, which can prevent quick biodegradation. Additionally, there is a misconception that PLA is biodegradable in nature, leading to improper disposal. It is important to emphasise that PLA should be composted in industrial facilities to ensure proper biodegradation.
Overall, while PLA is biodegradable and has the potential to be recyclable, the current infrastructure and consumer awareness fall short of ensuring its proper life cycle management. As a result, it often ends up in landfills or the ocean, contributing to plastic pollution. To fully realise the benefits of PLA as a biodegradable and recyclable material, improvements in waste management systems and consumer education are necessary.
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Density is critical in 3D printing for accurate weight estimates
Density is a critical factor in 3D printing, especially when it comes to achieving accurate weight estimates for printed objects. 3D printing involves the use of various materials, such as PLA, ABS, Polypropylene, and others, each with its own unique density.
The density of the printing material directly impacts the weight of the final printed object. By knowing the volume of the 3D model and the density of the chosen material, one can easily calculate the expected weight of the printed object. This calculation is essential for applications where weight is a critical factor, such as in drone or aircraft component manufacturing.
Infill density, or the internal structure within a printed object, also plays a significant role in weight estimation. Higher infill densities result in increased weight, strength, and rigidity, making them ideal for parts that need to withstand high stress. On the other hand, lower infill densities lead to reduced weight and increased flexibility, which is beneficial for prototypes or lightweight structures.
Additionally, the density of the printing material can impact the overall cost and printing time. Materials with lower density may require less material to achieve the desired strength, resulting in reduced material consumption and faster printing times. This consideration is particularly important for large-scale printing projects or when working with expensive materials.
Understanding the density of the chosen printing material, along with the ability to adjust infill densities, allows 3D printing enthusiasts and professionals to make informed decisions about the final weight, strength, and flexibility of their printed objects, ensuring accurate weight estimates and optimal material usage.
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PLA has a density of about 1.24 g/cm³
PLA, or polylactic acid, is a popular bioplastic commonly used in FDM 3D printing. It is a biodegradable plastic that comes from renewable organic resources such as corn starch or sugarcane. It is recyclable and can also be biologically decomposed in composting plants. It has a density of about 1.24 g/cm³.
The density of a material may vary based on temperature and pressure conditions due to contraction or expansion. However, this effect is less pronounced for solid materials, such as plastic filaments. PLA density is critical in 3D printing for accurate weight estimates, material use optimization, and obtaining desired product characteristics. For example, higher density (more infill) improves adhesion between layers, making the object stronger.
PLA has applications in engineering plastics, where it is blended with a rubber-like polymer such as ABS. These blends have good form stability and visual transparency, making them useful in low-end packaging applications. It is also used in automotive parts, such as floor mats, panels, and covers. Its heat resistance and durability are inferior to widely used polypropylene (PP), but its properties can be improved through methods such as capping of end groups to reduce hydrolysis.
PLA is also used in the medical field due to its bioactivity and biodegradability. It can be used for medical implants such as anchors, screws, plates, pins, rods, and mesh, as it can safely degrade into lactic acid and be absorbed by the human body.
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Frequently asked questions
PLA plastic, or polylactic acid, is a popular bioplastic commonly used in FDM 3D printing. It has a density of about 1.24 grams per cubic centimetre (g/cc).
PLA density is critical in 3D printing for accurate weight estimates, material use optimisation, and obtaining desired product characteristics. For example, higher density (more infill) improves adhesion between layers, making the object stronger.
PLA plastic is biodegradable, recyclable, and can be produced from sustainable sources such as corn starch or sugarcane. It is also one of the few plastics that can be organically broken down into its lactic acid components, which can be safely absorbed by the environment and the human body.
PLA has inferior heat resistance and durability compared to widely used polypropylene (PP). It is also very brittle, limiting its use in applications that require some level of plastic deformation at high-stress levels.
