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How is PE Film Produced?

Views: 50     Author: Site Editor     Publish Time: 2023-08-02      Origin: Site

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How is PE Film Produced? Blown Film Process: A Comprehensive Guide


In the world of packaging and plastics, Polyethylene (PE) film plays a crucial role. From food packaging to industrial applications, PE film is widely used due to its versatility and cost-effectiveness. But have you ever wondered how this essential material is produced? In this comprehensive guide, we will explore the blown film process, step by step, to understand how PE film is manufactured.

How is PE Film Produced? Blown Film Process

The blown film process is a popular and efficient method of manufacturing thin plastic films with various properties. It involves extruding molten plastic through a circular die and then inflating it to create a bubble-like structure. The expanding plastic bubble is then cooled and transformed into a flat film as it passes through rollers. This process is widely used due to its ability to produce films with precise thickness, excellent clarity, and a wide range of applications.

Raw Materials for Blown Film Process

Before diving into the details of the blown film process, let's first understand the raw materials used in PE film production. The primary raw material is Polyethylene, which is a polymer composed of ethylene monomers. There are three main types of Polyethylene used:

1. Low-Density Polyethylene (LDPE): LDPE is the most common type used in blown film production. It offers excellent flexibility and transparency, making it suitable for various packaging applications.

2. Linear Low-Density Polyethylene (LLDPE): LLDPE provides higher tensile strength and puncture resistance compared to LDPE. It is often used in heavy-duty packaging and industrial films.

3. High-Density Polyethylene (HDPE): HDPE offers greater rigidity and toughness, making it suitable for applications requiring more robust films, such as trash bags and construction films.

The Blown Film Process Step by Step

Now that we have an overview of the raw materials let's delve into the detailed blown film process. Here are the steps involved in producing PE film through the blown film process:

1. Resin Feeding

The process begins with the feeding of PE resin pellets into the extruder. The resin is heated, and its temperature is carefully controlled to achieve the desired melting point.

2. Extrusion

In the extruder, the resin is melted into a continuous molten mass. The extruder consists of a screw mechanism that helps in melting and homogenizing the resin.

3. Film Formation

The molten resin is then forced through a circular die, which results in the formation of a tube-like structure known as the "bubble." The size of the die determines the diameter of the bubble and, consequently, the width of the final film.

4. Bubble Expansion

As the molten tube exits the die, it is rapidly cooled with air, and air pressure is applied inside the bubble, causing it to expand. The speed of cooling and the air pressure control the film's thickness.

5. Cooling and Solidification

The expanded bubble passes through a set of cooling rollers that solidify the film. The temperature is controlled during this process to maintain the desired properties of the film.

6. Film Take-Off

The solidified film is pulled away from the cooling rollers and wound into large rolls, ready for further processing or packaging.

Advantages of Blown Film Process

The blown film process offers several advantages, making it a preferred choice for PE film production:

1. Versatility: The process can produce a wide range of film thicknesses, allowing manufacturers to cater to various packaging needs.

2. Cost-Effectiveness: Blown film is a cost-effective method for large-scale production due to its continuous process nature.

3. Customization: Manufacturers can modify the process to incorporate additives or blend different types of resins to achieve specific properties.

4. High Output Rates: Blown film extrusion lines can operate at high speeds, resulting in efficient production rates.

5. Excellent Optical Properties: The process produces films with excellent clarity and transparency, ideal for packaging applications.

PE Film Applications

PE film, produced through the blown film process, finds applications in various industries, including:

• Food Packaging: Wraps, bags, and pouches for preserving and protecting food items.

• Agriculture: Greenhouse films, mulch films, and silage covers to aid in crop production.

• Medical and Healthcare: Sterilizable medical packaging, bandages, and covers.

• Consumer Goods: Shopping bags, garbage bags, and disposable tablecloths.

• Industrial: Wrapping films, construction films, and pallet wraps.


Q: What is the primary material used in the blown film process? PE film is primarily produced using Polyethylene (PE) resins, which come in various types such as LDPE, LLDPE, and HDPE.

Q: How is the thickness of the film controlled during the blown film process? The film's thickness is controlled by adjusting the air pressure inside the bubble and the speed of cooling during the process.

Q: What are the advantages of using the blown film process? The blown film process offers versatility, cost-effectiveness, customization, high output rates, and excellent optical properties for PE film production.

Q: What are the main applications of PE film produced through the blown film process? PE film finds applications in food packaging, agriculture, medical and healthcare, consumer goods, and various industrial sectors.

Q: Can blown film production accommodate the addition of additives? Yes, blown film production can incorporate additives, allowing manufacturers to enhance the film's properties as per specific requirements.

Q: What makes LLDPE different from LDPE in terms of film production? LLDPE offers higher tensile strength and puncture resistance compared to LDPE, making it suitable for heavy-duty packaging and industrial films.


The blown film process is a remarkable method for producing Polyethylene (PE) films with exceptional properties and versatility. By extruding molten plastic through a circular die and inflating it into a bubble-like structure, manufacturers can create films for a wide range of applications, from food packaging to industrial use. Understanding the intricacies of this process allows us to appreciate the innovation behind the everyday materials that impact our lives positively.

Kaide New Material, Polyethylene Film Manufacturer In China

Kaide New Material is a prominent Chinese manufacturer and supplier that specializes in producing top-notch polyethylene film products. With over 8 years of experience in the industry, the company has established a reputation for producing innovative and reliable film solutions for a wide range of applications, including packaging, agriculture, construction, and more.

Our polyethylene films are made using advanced manufacturing processes and high-quality raw materials, ensuring superior performance, durability, and versatility. From standard films to custom-made products, Kaide New Material offers a comprehensive range of polyethylene films to meet the needs of various industries and applications.

The company is committed to providing excellent customer service, competitive pricing, and timely delivery, making them a trusted partner for businesses looking for reliable and cost-effective film solutions. With a strong focus on quality and innovation, Kaide New Material is a leading player in the polyethylene film industry, serving customers across China and around the world.