Ethan Clarke
Plastic is a versatile material used in a wide range of applications, from packaging to industrial products. Its flexibility is a key advantage, and some plastics are more bendable than others. This property is determined by the type of plastic and its thickness. For example, low-density polyethylene (LDPE) is a very flexible plastic that can be used in sheets up to 40mm thick while still retaining its flexibility. On the other hand, high-density polyethylene (HDPE) is known for its rigidity but is also used in flexible plastic sheets. The softness or hardness of plastics is typically measured using a durometer, which provides a Shore A or Shore D value.
| Characteristics | Values |
|---|---|
| Type | Polyvinyl Chloride (PVC) |
| Rigidity | Rigid and flexible |
| Use Cases | Plumbing, wiring, electrical cable insulation, flooring, door and window profiles, pipes, drinking and wastewater pipes, construction materials, bottles, non-food packaging, kiosks, store displays, exhibits, etc. |
| Properties | Light, durable, easy to process, shatter-resistant, abrasion-resistant, UV-tolerant, non-glare, anti-static, etc. |
| Type | Low-density Polyethylene (LDPE) |
| Rigidity | Flexible |
| Use Cases | Plastic bags, plastic wraps, containers, dispensing bottles, packaging, flexible plastic sheets, etc. |
| Properties | Thin, cheap to produce, lacks strength, tear resistance, puncture resistance, etc. |
| Type | Polypropylene (PP) |
| Rigidity | Hard and sturdy |
| Use Cases | Tupperware, car parts, thermal vests, yogurt containers, disposable diapers, living hinges, etc. |
| Properties | Resistant to fatigue, can withstand high temperatures |
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What You'll Learn
LD-PE is a bendable plastic
LD-PE, or low-density polyethylene, is a bendable plastic commonly used for flexible plastic sheets. It is known for its flexibility, even when the sheets are relatively thick (up to 40mm). This makes it ideal for packaging commercial products as it can easily conform to different shapes. LD-PE is also considered a rubbery material, or at least soft, and can be injection moulded.
LD-PE is one of the most commonly used plastics for flexible sheets due to its ability to maintain good flexibility even at larger sizes. These sheets can be rolled up for easy transportation and storage. However, LD-PE is not as strong as other plastics and lacks tear resistance and puncture resistance compared to denser plastics like HDPE (high-density polyethylene) and polycarbonate.
LD-PE's flexibility and ease of moulding make it a popular choice for various applications. It is often used for packaging common products such as plastic bags and shrink wrap. LD-PE's softness and rubbery texture also make it suitable for injection moulding, although there are more limited options for considerably soft and flexible materials.
While LD-PE offers advantages in terms of flexibility and mouldability, it has some drawbacks. It is not as durable as other plastics and is often treated as disposable, contributing significantly to global solid waste. Additionally, LD-PE may not be the best choice for applications requiring chemical resistance or UV-resistance, as these are important considerations in the material selection process.
In summary, LD-PE is a bendable plastic with a wide range of applications due to its flexibility, mouldability, and softness. However, its lack of strength and durability can be a disadvantage in certain contexts, and its disposability has environmental implications.
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EVA is a soft, flexible plastic
EVA, or ethylene-vinyl acetate, is a soft, flexible plastic with a variety of applications. It is a copolymer of ethylene and vinyl acetate, with the weight percentage of vinyl acetate typically ranging from 4 to 30%. At higher percentages of vinyl acetate (over 40%), EVA is referred to as ethylene-vinyl acetate rubber and exhibits increased softness and flexibility.
EVA is known for its rubber-like properties and is used in a range of products, including sports equipment padding, craft-foam sheets, and biomedical engineering applications. It has good low-temperature toughness, stress-crack resistance, and resistance to UV radiation. Additionally, it is used in orthotics, surfboard traction pads, and car mats, showcasing its versatility across various industries.
One notable application of EVA is in the medical field, where it is used to enhance patient comfort in prosthetics and orthotics. OP-TEK Flex and OP-TEK Flex Comfort are examples of soft, flexible EVA copolymers specifically designed for this purpose. The additive in OP-TEK Flex Comfort gives the material a softer feel, reducing friction and improving patient comfort.
EVA is also used in the cosplay community due to its ease of use, durability, and comfort when compared to traditional plastic-based costumes. It can be easily cut from sheets and molded to shape, making it a popular choice for crafting and designing. Furthermore, EVA is utilised in the manufacturing of artificial flowers, where it is formed into thin, flexible flower-making foam sheets that can be cut and ironed to assemble artificial petals.
Overall, EVA is a versatile, soft, and flexible plastic with a wide range of applications, from sports equipment to medical devices and creative industries. Its unique properties, including toughness and UV resistance, make it a valuable material in various sectors.
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PP is used for living hinges
Polypropylene (PP) is a type of plastic that is bendable and is often used for living hinges. A living hinge is a thin section of plastic that connects two plastic bodies together, allowing them to move rotationally from 1 to 180 degrees or more. This type of hinge is very durable and can last for millions of cycles.
PP is an ideal material for living hinges due to its high resistance to fatigue and its ability to be injection moulded. When designing a living hinge, it is important to consider the thickness of the hinge, as this can affect its flexibility and durability. A thicker hinge will be more resistant to bending, but it may also be more susceptible to microscopic surface cracks that reduce its flex life.
To achieve the best results, the thickness of the hinge should not exceed 0.015 inches, as this is when a significant decline in molecular orientation occurs. PP materials with a high percentage of elongation can help to mitigate this issue. Additionally, the ideal shape for melt flow through a restricted area is a 0.030-inch radius under the hinge.
When selecting a type of PP for living hinges, Homopolymer PP is the best choice as it consistently performs well and produces durable hinges. Random Copolymer PP is the second-best option, while Impact Copolymer is the least desirable and should only be used if low-temperature or impact strength is a requirement.
By using PP for living hinges, product designers can reduce costs and improve the user experience. Living hinges can replace conventional hinge designs, reducing the number of moulds, moulding operations, and assembly required. This makes living hinges a popular choice for a variety of applications, including dispensing closures with hinged caps, automobile gas pedals, and carrying cases.
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Polyethylene is used for flexible plastic sheets
Polyethylene, or PE, is a flexible plastic material with a range of applications. It is most commonly used for container production, including plastic bags, bottles, and films. PE is also used in product packaging, such as milk or juice cartons, and is considered safer for making toys.
There are several types of polyethylene, each with distinct mechanical properties. The type of branching and branching extension within the structure of PE directly affect its mechanical properties. For example, HDPE (high-density polyethylene) is known for its impact resistance and durability, making it suitable for producing plastics used in various conditions. However, HDPE has low flexibility compared to other types of PE.
LDPE (low-density polyethylene) is a lightweight, flexible, and soft plastic. It is widely used due to its low-temperature flexibility, toughness, and corrosion resistance. LDPE is commonly used in applications such as squeeze bottles, lamination plastics, food containers, and pipes. Its flexibility and ease of reshaping make it a popular choice for these products.
Another type of polyethylene is LLDPE (linear low-density polyethylene), which exhibits high flexibility and good impact resistance. LLDPE can be stretched without tearing, making it a versatile material. The flexibility of LDPE and LLDPE makes them suitable for use in flexible plastic sheets. These types of polyethylene can be formed into sheets and used in various applications where bendability and flexibility are required.
Flexible polyethylene sheeting can be recycled, although the recyclability depends on the type and thickness of the sheet. Some manufacturers produce polyethylene sheeting with recycled content, reducing its environmental impact. Polyethylene is a versatile material with a range of applications, and its flexibility makes it suitable for use in various products, including flexible plastic sheets.
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TPEs are rubbery plastics
Thermoplastic Elastomers (TPEs) are a unique class of engineering materials that combine the characteristics of conventional thermoset rubber with the efficiency of plastics. TPEs are composed of crystalline and amorphous domains, with the crystalline domains acting as "heat-fugitive cross-links" that give them their thermoplastic nature, and the amorphous domains providing their elastomeric qualities.
TPEs are highly versatile and can be processed using a variety of methods, including injection moulding, extrusion, blow moulding, melt calendaring, thermoforming, and heat welding. They are widely used in the automotive and household appliance sectors due to their range of physical properties. For example, TPEs are used in snowmobile tracks for their stiffness and abrasion resistance, as roofing materials, and in medical devices like catheters where their softness is advantageous.
TPEs exhibit high elasticity and rubber-like properties, including low compression set and high elongation. They can be stretched to moderate elongations and return to their original shape upon the removal of stress. This makes them suitable for applications requiring noise dampening and stress relaxation, such as automotive weather strips and hand grips.
TPEs also offer advantages over traditional thermoset rubber. They are easily reprocessed and remoulded, allowing for design flexibility. TPEs can be coloured easily and exhibit excellent colourability. They also have lower densities and improved consistency in raw materials and fabricated articles. Additionally, TPEs have the potential to be recyclable, as they can be moulded, extruded, and reused like plastics, although their rubber-like properties pose challenges in this regard.
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Frequently asked questions
Many types of plastic are bendable, including LD-PE, EVA, and members of the TPE family (TPE-S, TPE-V, TPE-O, TPE-A, and TPE-E).
Bendable plastics are used for flexible plastic sheets, which are used in packaging for common commercial products. They are also used for industrial applications such as liners for chemical storage and food storage.
The softness or hardness of plastic is typically measured using a device called a durometer, which expresses softness or hardness as a value. While there are many soft plastics, those with a hardness outside the Shore A scale and higher than Shore D 60 are not considered rubbery or elastic.
A common example of a bendable plastic product is a plastic bag. Plastic bags are made from low-density polyethylene (LDPE), which is a very flexible plastic that can conform to any geometry.
Bendable plastics are made by molding thin sheets of plastic that are flexible enough to be rolled up for transportation and storage.
