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Polyethylene
HDPE Wire and Cable Extrusion
LLDPE Wire and Cable Extrusion
LDPE Wire and Cable Extrusion
What's LDPE Blown Film ?
Zero Polymer’s LDPE Blown Film is a type of plastic film manufactured using Low-Density Polyethylene (LDPE) through a process called blown film extrusion. LDPE is a widely used polymer due to its flexible and lightweight nature, which makes it ideal for producing a variety of plastic films. Here’s a deeper look into the material and the process:
Key Characteristics of LDPE for Blown Film
- Flexibility
LDPE has a high degree of flexibility compared to other polyethylene variants. This allows it to stretch easily without breaking, making it suitable for products that require elongation, such as stretch wraps and bags. - Low Density
The “low-density” nature of LDPE results in less material used to produce films, making it a more cost-effective choice. It’s also less dense than other polyethylene types like HDPE and LLDPE, which contributes to the film’s lightness. - Clarity and Gloss
LDPE films are known for their excellent clarity and glossy appearance, making them ideal for food packaging or applications that require clear visibility of the product inside. This characteristic is particularly useful for retail packaging where product visibility is important. - Sealability
One of the strongest advantages of LDPE films is their sealing capabilities. They can be easily heat-sealed, which is crucial for applications like food packaging, where freshness must be preserved. - Moisture Resistance
LDPE films have good resistance to moisture, which helps in protecting goods from humidity and water damage. This makes them ideal for applications like agricultural films and protective wraps.
The Blown Film Extrusion Process
In blown film extrusion, LDPE resin is melted and forced through a circular die, forming a tubular shape. The film is then inflated like a bubble, which allows it to expand in both directions (radially and longitudinally). Here’s how it works in more detail:
- Feeding and Melting:
LDPE pellets are loaded into the extruder. The material is heated to a molten state, typically between 160°C to 200°C. - Extrusion and Inflation:
The molten polymer is pushed through a die, forming a thin tube of film. Air is then introduced inside the tube, causing it to expand (like blowing up a balloon). This process controls the thickness and diameter of the film. - Cooling and Solidification:
The film cools rapidly as it exits the die, solidifying the polymer structure. It is then guided through rollers to flatten and stabilize the film. - Winding:
Finally, the film is wound onto large spools for further processing or distribution.
LDPE Blown Film Grades ((2420, 0075,020, 190, 2102))
The LDPE Blown Film grades (2420, 0075, 020, 190, and 2102) are likely specific designations used for different Low-Density Polyethylene (LDPE) formulations tailored for various blown film extrusion applications. Each grade is typically engineered to optimize certain characteristics such as film strength, flexibility, sealability, and processing ease. Here’s a breakdown of what these grades might represent:
2420 (LDPE Grade)
Properties: Typically, a high molecular weight LDPE grade, offering good clarity, tensile strength, and sealing performance. Applications: Used for general packaging purposes such as bags, wrapping films, and food packaging due to its flexibility and resistance to impact. Read more….
0075 (LDPE Grade)
Properties: A grade with relatively low melt index and higher density, providing better puncture resistance and toughness. Applications: Suitable for stretch films, heavy-duty bags, and industrial liners where tear resistance and strength are essential. Read more….
020 (LDPE Grade)
Properties: Known for its low-density structure, this grade offers good transparency, flexibility, and sealability, making it perfect for films requiring strong seals and clarity. Applications: Ideal for food packaging, retail bags, garbage bags, and other thin films where ease of sealing is crucial. Read more….
190 (LDPE Grade)
Properties: This grade may be formulated for applications requiring films that need to handle stretching and durability under different conditions. Applications: Commonly used in agriculture (e.g., mulch films, greenhouse covers), shrink films, and protective wraps. Read more….
2102 (LDPE Grade)
Properties: This grade is often designed for robust films with high stretchability and tear resistance. Applications: Often used in food packaging films, stretch wraps, and industrial packaging where a higher tensile strength is needed, but with a focus on easy processability. Read more….