Ethan Clarke
When buying a new television, you may notice a thin plastic film on the screen. This is called static cling vinyl, and it is used to protect the screen during shipping and handling. Underneath this film, you will find the television's screen, which is surrounded by a plastic frame. Plastics, specifically thermoplastics, are used in many parts of a television, including the exterior casing, circuitry, and components such as light valves. The main types of plastics used in televisions include polyethylene, polycarbonate, polypropylene, and polyvinyl chloride (PVC). These plastics are chosen for their unique properties, such as flexibility, strength, and impact resistance. While plastics play a significant role in television manufacturing, other materials like glass, lead, and silicon are also essential components. When recycling a television, it is important to properly dispose of these plastics and other materials to reduce their environmental impact.
| Characteristics | Values |
|---|---|
| Type of plastic | Thermoplastics such as polyethylene, polypropylene, polycarbonate, polyvinyl chloride, and acrylonitrile butadiene styrene (ABS) |
| Properties of plastic | Melted down and remolded repeatedly, flexible, heat resistant, impact resistant, shatter-resistant, transparent, strong |
| Function in TV | Exterior casing, circuitry, light valves, cables, insulation |
| Recycling | Recyclable plastics are removed from the device and recycled separately to create other products |
| Plastic film on screen | Static Cling Vinyl |
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What You'll Learn
- Plastic is used in the exterior casing of a television
- Thermoplastics are used in television components like light valves
- Plastic is recyclable and can be used to create other products
- Polyethylene is a common plastic used in TVs and can be manufactured in varying densities
- Plastic waste management is a challenge due to high collection costs and low recycling rates
Plastic is used in the exterior casing of a television
Plastic is one of the main materials used in the exterior casing of a television. The most common plastic used in television casings is polyethylene, a thermoplastic that can be melted down and remoulded repeatedly. Polyethylene is made from the polymerisation of ethylene, which is produced from the cracking of ethane gas, separated from natural gas. Once the polyethylene is ready, it is moulded into the specific shape required to encase a television and is set into that shape using a thermoset.
The fixing of thermosets is necessary for electronic appliances like televisions that produce a significant amount of heat, to prevent the plastic encasing from melting. The most common thermoset used in televisions is urea formaldehyde, which is made by obtaining urea, a solid crystal derived from ammonia gas, and formaldehyde, derived from methane gas. These two substances are then chemically combined to create a resin-like material that is used as a thermoset.
Other plastics used in television enclosures include polycarbonate, which is known for its durability and impact resistance, and PVC, which is flexible, UV-resistant, and flame retardant. ABS is another plastic used in television enclosures, offering good impact resistance and chemical resistance, though it is less resilient to prolonged exposure to sunlight.
In addition to plastics, other materials used in television casings include glass, metals such as aluminium, and synthetic materials.
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Thermoplastics are used in television components like light valves
Thermoplastics are a type of plastic that can be melted down and remoulded repeatedly. This quality makes thermoplastics ideal for use in the exterior casing of a television, which can be moulded into a specific shape and then set using a thermoset. Thermoplastics are also used in the interior of televisions, such as in light valves.
Light valves are components that work together with cathode ray tubes to enable the electrons inside to be visible on screen. Cathode ray tubes are the video display components of a television and are made of glass and lead. Light valves, on the other hand, are made of thermoplastics like polyethylene. Polyethylene is made from the polymerization of ethylene, which is produced from the cracking of ethane gas. This type of plastic is also used in bubble wrap and TV remotes, as well as in wires and power outlets.
Thermoplastics are used in a variety of applications beyond just television components. They are commonly used in electrical and electronic products, such as domestic appliances (refrigerators, microwave ovens, coffee makers, kettles, etc.), office equipment (telecommunications, computers, fax machines, etc.), and entertainment devices (televisions, stereos, computer games, etc.). Thermoplastics are also used in the healthcare industry for surgical implements, catheters, implants, syringes, and sterilized components. In construction and civil engineering, thermoplastics are used for pipelines, sheeting, panelling, electrical cabling, and ducting.
The specific type of thermoplastic used in television components may vary, but some common types include ABS, PLA, Polyethylene (PS), Polypropylene (PE), Polyvinyl chloride (PVC), and Polystyrene (PS). These thermoplastics are chosen for their properties, such as rigidity, dimensional stability, and ease of processing.
Overall, thermoplastics play a crucial role in the manufacturing of televisions, especially in components like light valves, due to their unique properties and ability to be remoulded.
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Plastic is recyclable and can be used to create other products
Plastic is one of the most popular and useful materials of modern times. It is a polymer, which means it is made by linking chains of molecules called monomers together to create a large molecule. Plastic is derived from crude oil, natural gas, coal, or renewable products such as carbohydrates, fats, and oils.
Plastics are highly versatile and can be used to create a wide range of products. For example, plastic is used in solar panels and windmill blades to generate renewable energy. Plastic can also be used in 3D printing to create various objects without waste. Additionally, plastic is often used in packaging, such as bottles, boxes, cartons, and films.
Plastics contribute to sustainability. For instance, using plastic instead of glass reduces the weight of a product, requiring less fuel for transport and lowering emissions. Plastic can also be used for insulation in houses, saving energy due to its thermal properties.
Plastic is recyclable and can be reused to create new products. Recycling plastic involves a complex supply chain that begins when an empty container is placed in a recycling bin. The recyclables are then loaded onto a conveyor belt, where they undergo pre-sorting to remove non-recyclable materials and contaminants. After sorting, the plastic can be shredded into flakes or melt-processed into pellets before being molded into new products. Recycling plastic reduces the need for extracting new natural resources and helps decrease greenhouse gas emissions.
The plastic used in TVs, specifically LCD TVs, is primarily thermoplastic, such as polyethylene. Thermoplastics are used because they can be melted down and remolded into the desired shape for the exterior casing of the television. Once the plastic has been molded, a thermoset is applied to ensure it remains in that shape.
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Polyethylene is a common plastic used in TVs and can be manufactured in varying densities
Polyethylene is a common plastic used in the manufacturing of TVs. It is a thermoplastic, which means it can be melted down and remoulded repeatedly, making it ideal for the exterior casing of a television. The process involves melting the plastic into a molten form and pouring it into a mould, where it sets and takes its final shape.
Polyethylene is made from the polymerization of ethylene, which is derived from the cracking of ethane gas, a component of natural gas. Once moulded, a thermoset is applied to ensure the plastic retains its shape and does not melt again. This process is repeated for all plastic components of a television, which are then assembled.
Polyethylene is the most common plastic on earth and is used in a wide variety of products. It is classified by its density and branching, with its mechanical properties depending on variables such as the type and extent of branching, crystal structure, and molecular weight. The molecular weight of polyethylene can vary from 30,000 to 6,000,000 g/mol, and its density ranges from 0.89 g cm−3 (very low density) to 0.96 g cm−3 (high density).
The different types of polyethylene include LDPE (low-density polyethylene), which is softer and more transparent; LLDPE (linear low-density polyethylene), which is a copolymer of ethylene; and HDPE (high-density polyethylene), which is used in products requiring higher rigidity, such as plastic bottles and water pipes.
The choice of polyethylene grade depends on the specific application and desired properties. For example, LDPE is commonly used in shopping bags and plastic bags due to its low density and flexibility, while HDPE is used in products requiring more rigidity and strength, such as water pipes and snowboards.
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Plastic waste management is a challenge due to high collection costs and low recycling rates
Plastic is a significant component of television sets, with thermoplastics like polyethylene being used for the exterior casing. The manufacturing of televisions involves various materials and processes that can have detrimental effects on the environment, including the release of greenhouse gases during assembly and disposal.
Plastic waste management is a complex issue due to the challenges posed by high collection costs and low recycling rates. The collection of plastic waste is the first step in recycling, but it can be inefficient and costly, especially in low-income countries with limited resources for waste management infrastructure. The complexity and diversity of plastic compositions, including chemical additives, further complicate the recycling process, as different grades of plastic cannot be easily recycled together without degrading the properties of the final product.
The low recycling rates of plastic compared to other materials, such as aluminium, highlight the challenges in plastic waste management. The global trade in plastic waste often involves shipping to countries with lower processing costs, which can have widespread environmental impacts due to the use of incineration or open burning to reduce plastic mass and volume. These practices contribute to air pollution by emitting greenhouse gases and other toxic substances into the atmosphere.
To improve plastic waste management and increase recycling rates, it is crucial to invest in pretreatment, sorting, and recycling technologies. Simplifying recyclable packaging designs and improving waste data management systems, especially in developing countries, can also help enhance collection and recycling efforts. Additionally, advanced techniques such as solid-state polymerization can enhance the strength of recycled polymers without reaching their melting points, improving the market value of reprocessed resins.
Overall, addressing the challenges of plastic waste management requires a comprehensive approach that considers collection systems, recycling technologies, and the circular economy of plastics to reduce environmental impacts and promote sustainability.
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Frequently asked questions
Thermoplastics such as polyethylene are used for TV casings. This is because they can be melted down and remoulded repeatedly, which is part of the process of making the exterior casing of a television.
First, the plastic is melted down into molten plastic and poured into a mould. Once the plastic has set in the mould, a thermoset is applied to ensure that the plastic will not melt again.
Plastic is a lightweight, shatter-resistant alternative to glass. It can be made in different colours and can be made fluorescent, abrasion-resistant, bullet-resistant, UV-tolerant, anti-static, and more.
Glass and lead are found inside television screens, making up cathode ray tubes, which are the video display components. Other components that require plastic include light valves, which work with cathode ray tubes to enable the electrons inside to be visible on the screen. Silicon is also used for the logic board, circuit boards, and capacitors.
The plastic film that comes on new electronics is called "static cling vinyl".
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