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What are the Raw Materials Used in a Blown Film Machine?

2023-04-07

Five-layer Co-extrusion Blow Film Machine

Blown film machines are an essential piece of equipment for the plastic industry. They produce thin plastic films that are used in a variety of applications, such as packaging materials, bags, and wrapping. However, the production of high-quality plastic films requires the use of high-quality raw materials. In this article, we will explore the raw materials used in a blown film machine and their properties.

Types of Raw Materials Used in a Blown Film Machine

Blown film machines are used to produce plastic films from a variety of thermoplastic materials. The most common raw materials used in a blown film machine include:

  • Polyethylene (PE): This is the most commonly used material in blown film extrusion. It is a versatile material that can be used to produce a wide range of films, including high-density polyethylene (HDPE) and low-density polyethylene (LDPE).
    HDPE is used to produce stiff films that are suitable for packaging heavy items. LDPE is used to produce flexible films that are ideal for wrapping around objects. LLDPE is a blend of HDPE and LDPE and is used to produce films that have the properties of both materials.
  • Polypropylene (PP): PP is a thermoplastic polymer that is made from propylene monomer. It is stiffer and more heat-resistant than PE, This material is often used to produce films with high strength and stiffness, as well as industries that require films with good heat resistance, such as the food industry.
  • Polyvinyl chloride (PVC): This material is often used to produce films that require high clarity and good resistance to chemicals.
  • Ethylene vinyl acetate (EVA): This material is often used to produce films that require good adhesion and elasticity.
  • Nylon (PA): This material is often used to produce films that require high strength and durability, as well as films that require good barrier properties. PA films are strong, durable, and resistant to punctures and tears. They are used in the food industry to package products that require high levels of protection, such as meat and cheese.
  • Polystyrene (PS): This material is often used to produce films that require high clarity and good stiffness.

In addition to these raw materials, blown film machines may also use additives, such as colorants, UV stabilizers, and processing aids, to enhance the properties of the film or improve the extrusion process. The choice of raw materials and additives will depend on the specific requirements of the film being produced, as well as the processing conditions of the blown film machine.

Properties of Raw Materials Used in a Blown Film Machine

The properties of the raw materials used in a blown film machine determine the quality of the films produced. Some of the properties that are important for blown film applications include:

  • Melt Flow Rate (MFR): MFR is a measure of the ease with which a polymer can be melted and processed. It is expressed in grams per 10 minutes and is determined by the size and shape of the polymer molecules. Materials with a high MFR are easier to process, but they produce films that are weaker and have lower tensile strength.
  • Density: Density is a measure of the mass per unit volume of a material. It is expressed in grams per cubic centimeter and is an important parameter for determining the properties of films. Materials with a higher density produce stiffer films that are more resistant to tearing and puncturing.
  • Tensile Strength: Tensile strength is the maximum stress that a material can withstand before it breaks. It is an important property for films that are used for packaging and wrapping. Materials with a higher tensile strength produce films that are stronger and more durable.
  • Barrier Properties: Barrier properties are the ability of a film to prevent the transmission of gases, liquids, and solids. They are important for films that are used to package products that require protection from moisture, oxygen, and other contaminants.

Conclusion

In conclusion, the raw materials used in a blown film machine are essential for producing high-quality films. PE, PP, and PA are the most commonly used materials, and their properties can be modified to suit different applications. Understanding the properties of these materials can be helpful in selecting the right material for a specific application and in producing films to the required quality standards.

If you have any about the raw materials used in the blown film extrusion machine questions, or blown film extrusion machine needs, welcome to contact us!